-------------------------------------------------------------------------------- I1 cache: 65536 B, 64 B, 4-way associative D1 cache: 32768 B, 64 B, 8-way associative LL cache: 67108864 B, 64 B, 64-way associative Command: /usr/home/liquid/.rustup/toolchains/w-profiling/bin/rustc --crate-name primitive_types --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg feature="default" --cfg feature="impl-codec" --cfg feature="std" -C metadata=63a27f5e3a5ebbd3 -C extra-filename=-63a27f5e3a5ebbd3 --out-dir /usr/home/liquid/tmp/.tmpSQ1Bc3/target/debug/deps -L dependency=/usr/home/liquid/tmp/.tmpSQ1Bc3/target/debug/deps --extern fixed_hash=/usr/home/liquid/tmp/.tmpSQ1Bc3/target/debug/deps/libfixed_hash-775d2e8a0d804436.rmeta --extern impl_codec=/usr/home/liquid/tmp/.tmpSQ1Bc3/target/debug/deps/libimpl_codec-40483e8302187126.rmeta --extern uint=/usr/home/liquid/tmp/.tmpSQ1Bc3/target/debug/deps/libuint-66c94465f7ef654b.rmeta -Adeprecated -Aunknown-lints -Zincremental-verify-ich Data file: results/cgout-w-profiling-primitive-types-0.10.1-Debug-Full Events recorded: Ir Events shown: Ir Event sort order: Ir Thresholds: 0.1 Include dirs: User annotated: Auto-annotation: on -------------------------------------------------------------------------------- Ir -------------------------------------------------------------------------------- 15,017,272,862 (100.0%) PROGRAM TOTALS -------------------------------------------------------------------------------- Ir file:function -------------------------------------------------------------------------------- 613,803,122 ( 4.09%) ???:llvm::SelectionDAG::Combine(llvm::CombineLevel, llvm::AAResults*, llvm::CodeGenOpt::Level) 392,661,765 ( 2.61%) ???:(anonymous namespace)::Verifier::visitInstruction(llvm::Instruction&) 341,735,691 ( 2.28%) ./malloc/malloc.c:_int_free 310,421,177 ( 2.07%) ./malloc/malloc.c:_int_malloc 305,974,438 ( 2.04%) ???:llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) 230,188,929 ( 1.53%) ???:(anonymous namespace)::RegAllocFast::allocateBasicBlock(llvm::MachineBasicBlock&) 203,939,387 ( 1.36%) ./malloc/malloc.c:malloc 193,638,344 ( 1.29%) ???:(anonymous namespace)::PruningFunctionCloner::CloneBlock(llvm::BasicBlock const*, llvm::ilist_iterator, false, true>, std::vector >&) 171,099,815 ( 1.14%) ???:llvm::FPPassManager::runOnFunction(llvm::Function&) 157,670,172 ( 1.05%) ???:(anonymous namespace)::Verifier::visitMDNode(llvm::MDNode const&, (anonymous namespace)::Verifier::AreDebugLocsAllowed) 142,715,267 ( 0.95%) ???:llvm::InlineFunction(llvm::CallBase&, llvm::InlineFunctionInfo&, llvm::AAResults*, bool, llvm::Function*) 140,631,188 ( 0.94%) ???:llvm::MachineInstr::addOperand(llvm::MachineFunction&, llvm::MachineOperand const&) 121,008,477 ( 0.81%) ???:llvm::raw_svector_ostream::write_impl(char const*, unsigned long) 112,474,183 ( 0.75%) ???:llvm::MetadataTracking::track(void*, llvm::Metadata&, llvm::PointerUnion) 109,046,104 ( 0.73%) ???:(anonymous namespace)::Verifier::visitCallBase(llvm::CallBase&) 104,858,476 ( 0.70%) ???:llvm::ScheduleDAGSDNodes::BuildSchedUnits() 103,825,877 ( 0.69%) ./string/../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:__memset_avx2_erms 103,113,259 ( 0.69%) ./malloc/malloc.c:free 98,920,282 ( 0.66%) ???:llvm::SelectionDAG::getConstant(llvm::ConstantInt const&, llvm::SDLoc const&, llvm::EVT, bool, bool) 96,121,356 ( 0.64%) ???:llvm::TargetLoweringBase::getTypeConversion(llvm::LLVMContext&, llvm::EVT) const 95,165,831 ( 0.63%) ???:llvm::SelectionDAG::MorphNodeTo(llvm::SDNode*, unsigned int, llvm::SDVTList, llvm::ArrayRef) 94,795,497 ( 0.63%) ???:llvm::FoldingSet::NodeEquals(llvm::FoldingSetBase const*, llvm::FoldingSetBase::Node*, llvm::FoldingSetNodeID const&, unsigned int, llvm::FoldingSetNodeID&) 89,241,199 ( 0.59%) ./string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:__memcpy_avx_unaligned_erms 83,224,150 ( 0.55%) ???:llvm::InstrEmitter::EmitMachineNode(llvm::SDNode*, bool, bool, llvm::DenseMap, llvm::detail::DenseMapPair >&) 80,814,046 ( 0.54%) ???:(anonymous namespace)::VarLocBasedLDV::process(llvm::MachineInstr&, (anonymous namespace)::VarLocBasedLDV::OpenRangesSet&, (anonymous namespace)::VarLocBasedLDV::VarLocMap&, llvm::SmallVector<(anonymous namespace)::VarLocBasedLDV::TransferDebugPair, 4u>&) 77,204,702 ( 0.51%) ???:llvm::MCExpr::evaluateAsRelocatableImpl(llvm::MCValue&, llvm::MCAssembler const*, llvm::MCAsmLayout const*, llvm::MCFixup const*, llvm::DenseMap, llvm::detail::DenseMapPair > const*, bool) const 75,263,056 ( 0.50%) ???:(anonymous namespace)::Verifier::verify(llvm::Function const&) [clone .llvm.4153962086227604281] 72,396,318 ( 0.48%) ???:(anonymous namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*) [clone .llvm.8386621111310650999] 71,947,413 ( 0.48%) ???:(anonymous namespace)::DAGCombiner::combine(llvm::SDNode*) 71,256,198 ( 0.47%) ???:llvm::TargetRegisterInfo::shouldRealignStack(llvm::MachineFunction const&) const 70,228,871 ( 0.47%) ???:llvm::SmallPtrSetImplBase::insert_imp_big(void const*) 64,241,268 ( 0.43%) ???:llvm::DAGTypeLegalizer::run() 59,939,862 ( 0.40%) ???:llvm::calculateDbgEntityHistory(llvm::MachineFunction const*, llvm::TargetRegisterInfo const*, llvm::DbgValueHistoryMap&, llvm::DbgLabelInstrMap&) 59,424,571 ( 0.40%) ???:(anonymous namespace)::X86MCCodeEmitter::emitPrefixImpl(unsigned int&, llvm::MCInst const&, llvm::MCSubtargetInfo const&, llvm::raw_ostream&) const 54,753,947 ( 0.36%) ???:llvm::SelectionDAG::Legalize() 54,715,646 ( 0.36%) ???:llvm::FoldingSetBase::FindNodeOrInsertPos(llvm::FoldingSetNodeID const&, void*&, llvm::FoldingSetBase::FoldingSetInfo const&) 53,689,556 ( 0.36%) ???:(anonymous namespace)::TwoAddressInstructionPass::runOnMachineFunction(llvm::MachineFunction&) 51,049,009 ( 0.34%) ???:llvm::FunctionLoweringInfo::set(llvm::Function const&, llvm::MachineFunction&, llvm::SelectionDAG*) 49,350,985 ( 0.33%) ???:llvm::MCAsmLayout::getFragmentOffset(llvm::MCFragment const*) const 48,475,706 ( 0.32%) ???:(anonymous namespace)::ScheduleDAGRRList::Schedule() [clone .llvm.6953762222372402862] 47,171,572 ( 0.31%) ???:llvm::SmallSet >::insert(llvm::Register const&) 45,172,388 ( 0.30%) ???:llvm::ScheduleDAGSDNodes::AddSchedEdges() 45,133,396 ( 0.30%) ???:llvm::AttributeList::addAttributes(llvm::LLVMContext&, unsigned int, llvm::AttrBuilder const&) const 45,025,319 ( 0.30%) ???:(anonymous namespace)::Mapper::mapValue(llvm::Value const*) [clone .llvm.12166235158543170009] 44,912,870 ( 0.30%) ???:llvm::ValueMapper::remapInstruction(llvm::Instruction&) 44,830,651 ( 0.30%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_trait_selection/src/traits/fulfill.rs:>::process_obligations::> 43,827,912 ( 0.29%) ???:llvm::Instruction::clone() const 43,365,960 ( 0.29%) ???:llvm::SimplifyInstruction(llvm::Instruction*, llvm::SimplifyQuery const&, llvm::OptimizationRemarkEmitter*) 42,980,163 ( 0.29%) ./malloc/malloc.c:malloc_consolidate 42,900,173 ( 0.29%) ???:llvm::DataLayout::getAlignment(llvm::Type*, bool) const 41,041,669 ( 0.27%) ???:llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) 40,590,186 ( 0.27%) ???:llvm::StringMapImpl::LookupBucketFor(llvm::StringRef) 38,762,948 ( 0.26%) ./string/../sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S:__memcmp_avx2_movbe 38,762,177 ( 0.26%) ???:llvm::PMDataManager::verifyPreservedAnalysis(llvm::Pass*) 38,673,655 ( 0.26%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_data_structures/src/obligation_forest/mod.rs:>::process_obligations::> 38,480,545 ( 0.26%) ???:llvm::X86TargetLowering::PerformDAGCombine(llvm::SDNode*, llvm::TargetLowering::DAGCombinerInfo&) const 38,429,807 ( 0.26%) ???:llvm::MCObjectStreamer::emitBytes(llvm::StringRef) 38,101,008 ( 0.25%) ???:llvm::DILocation::getImpl(llvm::LLVMContext&, unsigned int, unsigned int, llvm::Metadata*, llvm::Metadata*, bool, llvm::Metadata::StorageType, bool) 37,645,608 ( 0.25%) ???:llvm::MetadataTracking::untrack(void*, llvm::Metadata&) 37,544,611 ( 0.25%) ./string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:__memcpy_sse2_unaligned_erms 37,212,572 ( 0.25%) ???:llvm::SelectionDAG::computeKnownBits(llvm::SDValue, llvm::APInt const&, unsigned int) const 37,211,894 ( 0.25%) ???:llvm::SelectionDAG::getRegister(unsigned int, llvm::EVT) 36,834,988 ( 0.25%) ???:llvm::FoldingSetNodeID::AddInteger(unsigned int) 36,337,168 ( 0.24%) ???:(anonymous namespace)::X86MCInstLower::Lower(llvm::MachineInstr const*, llvm::MCInst&) const 36,221,366 ( 0.24%) ???:llvm::PointerMayBeCaptured(llvm::Value const*, llvm::CaptureTracker*, unsigned int) 36,163,160 ( 0.24%) ???:llvm::X86FrameLowering::hasFP(llvm::MachineFunction const&) const 35,792,134 ( 0.24%) ./stdlib/msort.c:msort_with_tmp.part.0 35,428,573 ( 0.24%) ???:(anonymous namespace)::PEI::runOnMachineFunction(llvm::MachineFunction&) 34,887,753 ( 0.23%) ./malloc/malloc.c:unlink_chunk.constprop.0 34,054,545 ( 0.23%) ???:llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&, llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&, unsigned int, bool) const 33,081,689 ( 0.22%) ???:(anonymous namespace)::DAGCombiner::visitSTORE(llvm::SDNode*) 33,027,099 ( 0.22%) ???:llvm::MCAsmLayout::getSymbolOffset(llvm::MCSymbol const&) const 32,981,932 ( 0.22%) ???:(anonymous namespace)::Verifier::visitFunction(llvm::Function const&)::$_3::operator()(llvm::Instruction const&, llvm::MDNode const*) const 32,162,136 ( 0.21%) ???:llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc const&, llvm::EVT, llvm::SDValue, llvm::SDValue, llvm::SDNodeFlags) 31,958,609 ( 0.21%) ???:llvm::DenseMapBase > >, llvm::WeakTrackingVH, llvm::DenseMapInfo > > >, llvm::detail::DenseMapPair > >, llvm::WeakTrackingVH> >, llvm::ValueMapCallbackVH > >, llvm::WeakTrackingVH, llvm::DenseMapInfo > > >, llvm::detail::DenseMapPair > >, llvm::WeakTrackingVH> >::moveFromOldBuckets(llvm::detail::DenseMapPair > >, llvm::WeakTrackingVH>*, llvm::detail::DenseMapPair > >, llvm::WeakTrackingVH>*) 31,626,556 ( 0.21%) ./elf/dl-lookup.c:_dl_lookup_symbol_x 31,391,959 ( 0.21%) ???:(anonymous namespace)::X86MCCodeEmitter::encodeInstruction(llvm::MCInst const&, llvm::raw_ostream&, llvm::SmallVectorImpl&, llvm::MCSubtargetInfo const&) const 31,066,266 ( 0.21%) ???:llvm::CallBase::getArgOperand(unsigned int) const 30,907,893 ( 0.21%) ???:llvm::Instruction::getMetadataImpl(unsigned int) const 30,856,186 ( 0.21%) ???:llvm::DwarfDebug::beginInstruction(llvm::MachineInstr const*) 29,410,507 ( 0.20%) ???:llvm::SelectionDAG::AssignTopologicalOrder() 28,861,267 ( 0.19%) ???:llvm::Instruction::~Instruction() 28,483,355 ( 0.19%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_infer/src/infer/mod.rs:>::process_obligations::> 28,147,773 ( 0.19%) ???:llvm::X86RegisterInfo::eliminateFrameIndex(llvm::MachineInstrBundleIterator, int, unsigned int, llvm::RegScavenger*) const 27,756,630 ( 0.18%) /usr/home/liquid/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.12.0/src/raw/mod.rs:, (), core::hash::BuildHasherDefault>>::from_hash::>::{closure#0}> 27,226,270 ( 0.18%) ???:llvm::SmallDenseMap, llvm::detail::DenseSetPair >::grow(unsigned int) 26,978,839 ( 0.18%) ???:(anonymous namespace)::X86MCCodeEmitter::emitMemModRMByte(llvm::MCInst const&, unsigned int, unsigned int, unsigned long, bool, unsigned long, llvm::raw_ostream&, llvm::SmallVectorImpl&, llvm::MCSubtargetInfo const&, bool) const 26,605,581 ( 0.18%) ???:llvm::Function::dropAllReferences() 26,524,141 ( 0.18%) ???:(anonymous namespace)::RegAllocFast::markRegUsedInInstr(unsigned short) 26,139,683 ( 0.17%) ???:llvm::ValueHandleBase::AddToUseList() 26,061,061 ( 0.17%) ???:(anonymous namespace)::VarLocBasedLDV::collectIDsForRegs(llvm::SmallSet >&, llvm::SmallSet > const&, llvm::CoalescingBitVector const&, (anonymous namespace)::VarLocBasedLDV::VarLocMap const&) 25,193,932 ( 0.17%) ./elf/dl-lookup.c:do_lookup_x 25,169,593 ( 0.17%) ???:(anonymous namespace)::VarLocBasedLDV::ExtendRanges(llvm::MachineFunction&, llvm::TargetPassConfig*) [clone .llvm.4451506318407214204] 25,104,925 ( 0.17%) ???:llvm::DomTreeBuilder::SemiNCAInfo >::CalculateFromScratch(llvm::DominatorTreeBase&, llvm::DomTreeBuilder::SemiNCAInfo >::BatchUpdateInfo*) 23,903,751 ( 0.16%) /usr/home/liquid/rust/worktree-benchmarking/library/alloc/src/vec/mod.rs:>::process_obligations::> 23,396,917 ( 0.16%) ???:llvm::LazyCallGraph::Node::populateSlow() 23,170,015 ( 0.15%) ???:llvm::ScheduleDAGSDNodes::EmitSchedule(llvm::MachineInstrBundleIterator&) 22,967,092 ( 0.15%) ???:llvm::MCELFStreamer::emitInstToData(llvm::MCInst const&, llvm::MCSubtargetInfo const&) 22,791,017 ( 0.15%) ???:llvm::MachineFunction::CreateMachineInstr(llvm::MCInstrDesc const&, llvm::DebugLoc const&, bool) 22,366,567 ( 0.15%) ???:llvm::MCObjectStreamer::emitInstruction(llvm::MCInst const&, llvm::MCSubtargetInfo const&) 21,946,715 ( 0.15%) /usr/home/liquid/rust/worktree-benchmarking/library/core/src/num/uint_macros.rs:::short_write_process_buffer:: 21,843,436 ( 0.15%) ???:(anonymous namespace)::ELFObjectWriter::recordRelocation(llvm::MCAssembler&, llvm::MCAsmLayout const&, llvm::MCFragment const*, llvm::MCFixup const&, llvm::MCValue, unsigned long&) [clone .llvm.14145361893594770252] 21,818,302 ( 0.15%) ???:(anonymous namespace)::RegAllocFast::setPhysReg(llvm::MachineInstr&, llvm::MachineOperand&, unsigned short) 21,293,873 ( 0.14%) ???:llvm::AsmPrinter::emitFunctionBody() 21,289,939 ( 0.14%) /tmp/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/../../../../gcc-5.5.0/libstdc++-v3/libsupc++/new_op.cc:operator new(unsigned long) 21,206,651 ( 0.14%) ???:(anonymous namespace)::X86DAGToDAGISel::selectAddr(llvm::SDNode*, llvm::SDValue, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&, llvm::SDValue&) 20,887,666 ( 0.14%) ./malloc/malloc.c:realloc 20,683,213 ( 0.14%) ???:llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc const&, llvm::EVT, llvm::SDValue, llvm::SDNodeFlags) 20,626,816 ( 0.14%) ???:llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc const&, llvm::SDVTList, llvm::ArrayRef) 20,515,932 ( 0.14%) ???:llvm::Value::deleteValue() 20,244,301 ( 0.13%) /usr/home/liquid/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.12.0/src/raw/mod.rs:>>::from_key_hashed_nocheck:: 20,174,563 ( 0.13%) ???:llvm::X86FrameLowering::getFrameIndexReference(llvm::MachineFunction const&, int, llvm::Register&) const 19,972,396 ( 0.13%) ???:llvm::MCDwarfLineAddr::Encode(llvm::MCContext&, llvm::MCDwarfLineTableParams, long, unsigned long, llvm::raw_ostream&) 19,889,844 ( 0.13%) ???:(anonymous namespace)::RegAllocFast::isRegUsedInInstr(unsigned short, bool) const 19,676,174 ( 0.13%) ???:llvm::InstrEmitter::EmitCopyFromReg(llvm::SDNode*, unsigned int, bool, bool, llvm::Register, llvm::DenseMap, llvm::detail::DenseMapPair >&) 19,621,095 ( 0.13%) ???:(anonymous namespace)::RegAllocFast::allocVirtReg(llvm::MachineInstr&, (anonymous namespace)::RegAllocFast::LiveReg&, llvm::Register, bool) 19,488,385 ( 0.13%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_infer/src/infer/mod.rs:::shallow_resolve_ty 18,938,766 ( 0.13%) /usr/home/liquid/rust/worktree-benchmarking/library/core/src/cell.rs:>::process_obligations::> 18,864,234 ( 0.13%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_infer/src/infer/type_variable.rs:>::process_obligations::> 18,580,723 ( 0.12%) ???:llvm::SelectionDAG::getConstant(unsigned long, llvm::SDLoc const&, llvm::EVT, bool, bool) 18,514,894 ( 0.12%) ???:llvm::Twine::printOneChild(llvm::raw_ostream&, llvm::Twine::Child, llvm::Twine::NodeKind) const 18,326,541 ( 0.12%) ???:(anonymous namespace)::Verifier::verifyFunctionAttrs(llvm::FunctionType*, llvm::AttributeList, llvm::Value const*, bool) 18,150,794 ( 0.12%) ???:llvm::DILocalScope::getSubprogram() const 17,660,297 ( 0.12%) ???:bool llvm::DenseMapBase, llvm::detail::DenseSetPair >, llvm::DILocation*, llvm::detail::DenseSetEmpty, llvm::MDNodeInfo, llvm::detail::DenseSetPair >::LookupBucketFor(llvm::DILocation* const&, llvm::detail::DenseSetPair const*&) const 17,535,107 ( 0.12%) ???:llvm::ComputeValueVTs(llvm::TargetLowering const&, llvm::DataLayout const&, llvm::Type*, llvm::SmallVectorImpl&, llvm::SmallVectorImpl*, llvm::SmallVectorImpl*, unsigned long) 17,533,037 ( 0.12%) ???:llvm::DAGTypeLegalizer::AnalyzeNewNode(llvm::SDNode*) 17,517,991 ( 0.12%) ???:llvm::FoldingSetBase::GetOrInsertNode(llvm::FoldingSetBase::Node*, llvm::FoldingSetBase::FoldingSetInfo const&) 17,421,099 ( 0.12%) ???:(anonymous namespace)::DAGCombiner::AddToWorklist(llvm::SDNode*) [clone .llvm.5281899161230911613] 17,251,234 ( 0.11%) ???:llvm::SDNode::Profile(llvm::FoldingSetNodeID&) const 17,193,537 ( 0.11%) ???:llvm::Instruction::setMetadata(unsigned int, llvm::MDNode*) 17,145,695 ( 0.11%) ???:DecodeIITType(unsigned int&, llvm::ArrayRef, IIT_Info, llvm::SmallVectorImpl&) [clone .llvm.4021314427178024980] 17,131,472 ( 0.11%) ???:(anonymous namespace)::X86AsmBackend::emitInstructionBegin(llvm::MCObjectStreamer&, llvm::MCInst const&) 17,062,096 ( 0.11%) ./string/../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:__memset_avx2_unaligned_erms 16,876,225 ( 0.11%) ???:llvm::SelectionDAGBuilder::visitStore(llvm::StoreInst const&) 16,870,498 ( 0.11%) ???:llvm::CoalescingBitVector::find(unsigned long) const 16,684,445 ( 0.11%) ???:llvm::SelectionDAG::clear() 16,564,520 ( 0.11%) ???:matchIntrinsicType(llvm::Type*, llvm::ArrayRef&, llvm::SmallVectorImpl&, llvm::SmallVectorImpl > >&, bool) [clone .llvm.4021314427178024980] 16,345,403 ( 0.11%) ???:llvm::SelectionDAG::RemoveDeadNodes() 15,782,305 ( 0.11%) /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_trait_selection/src/traits/select/mod.rs:>::process_obligations::> 15,756,222 ( 0.10%) ???:llvm::LexicalScopes::extractLexicalScopes(llvm::SmallVectorImpl >&, llvm::DenseMap, llvm::detail::DenseMapPair >&) 15,752,274 ( 0.10%) /usr/home/liquid/.cargo/registry/src/github.com-1ecc6299db9ec823/ena-0.14.0/src/snapshot_vec.rs:>::process_obligations::> 15,605,882 ( 0.10%) ???:llvm::LexicalScopes::assignInstructionRanges(llvm::SmallVectorImpl >&, llvm::DenseMap, llvm::detail::DenseMapPair >&) 15,503,873 ( 0.10%) ???:(anonymous namespace)::X86AsmBackend::emitInstructionEnd(llvm::MCObjectStreamer&, llvm::MCInst const&) 15,349,415 ( 0.10%) ???:llvm::MachineInstr::AddRegOperandsToUseLists(llvm::MachineRegisterInfo&) 15,129,192 ( 0.10%) ???:(anonymous namespace)::X86DAGToDAGISel::CheckNodePredicate(llvm::SDNode*, unsigned int) const [clone .llvm.5851529081540066507] 15,040,880 ( 0.10%) /usr/home/liquid/rust/worktree-benchmarking/library/core/src/slice/mod.rs:::attrs -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/.cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.12.0/src/raw/mod.rs -------------------------------------------------------------------------------- Ir -- line 111 ---------------------------------------- . const EMPTY: u8 = 0b1111_1111; . . /// Control byte value for a deleted bucket. . const DELETED: u8 = 0b1000_0000; . . /// Checks whether a control byte represents a full bucket (top bit is clear). . #[inline] . fn is_full(ctrl: u8) -> bool { 4,103,427 ( 0.03%) ctrl & 0x80 == 0 . } . . /// Checks whether a control byte represents a special value (top bit is set). . #[inline] . fn is_special(ctrl: u8) -> bool { . ctrl & 0x80 != 0 . } . . /// Checks whether a special control value is EMPTY (just check 1 bit). . #[inline] . fn special_is_empty(ctrl: u8) -> bool { . debug_assert!(is_special(ctrl)); 337,147 ( 0.00%) ctrl & 0x01 != 0 . } . . /// Primary hash function, used to select the initial bucket to probe from. . #[inline] . #[allow(clippy::cast_possible_truncation)] . fn h1(hash: u64) -> usize { . // On 32-bit platforms we simply ignore the higher hash bits. . hash as usize -- line 140 ---------------------------------------- -- line 143 ---------------------------------------- . /// Secondary hash function, saved in the low 7 bits of the control byte. . #[inline] . #[allow(clippy::cast_possible_truncation)] . fn h2(hash: u64) -> u8 { . // Grab the top 7 bits of the hash. While the hash is normally a full 64-bit . // value, some hash functions (such as FxHash) produce a usize result . // instead, which means that the top 32 bits are 0 on 32-bit platforms. . let hash_len = usize::min(mem::size_of::(), mem::size_of::()); 83,735,693 ( 0.56%) let top7 = hash >> (hash_len * 8 - 7); . (top7 & 0x7f) as u8 // truncation . } . . /// Probe sequence based on triangular numbers, which is guaranteed (since our . /// table size is a power of two) to visit every group of elements exactly once. . /// . /// A triangular probe has us jump by 1 more group every time. So first we . /// jump by 1 group (meaning we just continue our linear scan), then 2 groups -- line 159 ---------------------------------------- -- line 170 ---------------------------------------- . #[inline] . fn move_next(&mut self, bucket_mask: usize) { . // We should have found an empty bucket by now and ended the probe. . debug_assert!( . self.stride <= bucket_mask, . "Went past end of probe sequence" . ); . 556,554 ( 0.00%) self.stride += Group::WIDTH; 556,554 ( 0.00%) self.pos += self.stride; 486,520 ( 0.00%) self.pos &= bucket_mask; . } . } . . /// Returns the number of buckets needed to hold the given number of items, . /// taking the maximum load factor into account. . /// . /// Returns `None` if an overflow occurs. . // Workaround for emscripten bug emscripten-core/emscripten-fastcomp#258 . #[cfg_attr(target_os = "emscripten", inline(never))] . #[cfg_attr(not(target_os = "emscripten"), inline)] . fn capacity_to_buckets(cap: usize) -> Option { . debug_assert_ne!(cap, 0); . . // For small tables we require at least 1 empty bucket so that lookups are . // guaranteed to terminate if an element doesn't exist in the table. 359,636 ( 0.00%) if cap < 8 { . // We don't bother with a table size of 2 buckets since that can only . // hold a single element. Instead we skip directly to a 4 bucket table . // which can hold 3 elements. 793,580 ( 0.01%) return Some(if cap < 4 { 4 } else { 8 }); . } . . // Otherwise require 1/8 buckets to be empty (87.5% load) . // . // Be careful when modifying this, calculate_layout relies on the . // overflow check here. 126,612 ( 0.00%) let adjusted_cap = cap.checked_mul(8)? / 7; . . // Any overflows will have been caught by the checked_mul. Also, any . // rounding errors from the division above will be cleaned up by . // next_power_of_two (which can't overflow because of the previous division). . Some(adjusted_cap.next_power_of_two()) . } . . /// Returns the maximum effective capacity for the given bucket mask, taking . /// the maximum load factor into account. . #[inline] . fn bucket_mask_to_capacity(bucket_mask: usize) -> usize { 928,241 ( 0.01%) if bucket_mask < 8 { . // For tables with 1/2/4/8 buckets, we always reserve one empty slot. . // Keep in mind that the bucket mask is one less than the bucket count. . bucket_mask . } else { . // For larger tables we reserve 12.5% of the slots as empty. 154,232 ( 0.00%) ((bucket_mask + 1) / 8) * 7 . } . } . . /// Helper which allows the max calculation for ctrl_align to be statically computed for each T . /// while keeping the rest of `calculate_layout_for` independent of `T` . #[derive(Copy, Clone)] . struct TableLayout { . size: usize, -- line 233 ---------------------------------------- -- line 246 ---------------------------------------- . . #[inline] . fn calculate_layout_for(self, buckets: usize) -> Option<(Layout, usize)> { . debug_assert!(buckets.is_power_of_two()); . . let TableLayout { size, ctrl_align } = self; . // Manual layout calculation since Layout methods are not yet stable. . let ctrl_offset = 741,616 ( 0.00%) size.checked_mul(buckets)?.checked_add(ctrl_align - 1)? & !(ctrl_align - 1); 986,374 ( 0.01%) let len = ctrl_offset.checked_add(buckets + Group::WIDTH)?; . . Some(( . unsafe { Layout::from_size_align_unchecked(len, ctrl_align) }, . ctrl_offset, . )) . } . } . -- line 263 ---------------------------------------- -- line 337 ---------------------------------------- . } . } . #[cfg_attr(feature = "inline-more", inline)] . pub unsafe fn drop(&self) { . self.as_ptr().drop_in_place(); . } . #[inline] . pub unsafe fn read(&self) -> T { 1,434 ( 0.00%) self.as_ptr().read() . } . #[inline] . pub unsafe fn write(&self, val: T) { . self.as_ptr().write(val); . } . #[inline] . pub unsafe fn as_ref<'a>(&self) -> &'a T { . &*self.as_ptr() -- line 353 ---------------------------------------- -- line 422 ---------------------------------------- . /// Creates a new empty hash table without allocating any memory, using the . /// given allocator. . /// . /// In effect this returns a table with exactly 1 bucket. However we can . /// leave the data pointer dangling since that bucket is never written to . /// due to our load factor forcing us to always have at least 1 free bucket. . #[inline] . pub fn new_in(alloc: A) -> Self { 6,570 ( 0.00%) Self { . table: RawTableInner::new_in(alloc), . marker: PhantomData, . } . } . . /// Allocates a new hash table with the given number of buckets. . /// . /// The control bytes are left uninitialized. -- line 438 ---------------------------------------- -- line 440 ---------------------------------------- . unsafe fn new_uninitialized( . alloc: A, . buckets: usize, . fallibility: Fallibility, . ) -> Result { . debug_assert!(buckets.is_power_of_two()); . . Ok(Self { 940 ( 0.00%) table: RawTableInner::new_uninitialized( . alloc, . TableLayout::new::(), . buckets, . fallibility, . )?, . marker: PhantomData, . }) . } -- line 456 ---------------------------------------- -- line 458 ---------------------------------------- . /// Attempts to allocate a new hash table with at least enough capacity . /// for inserting the given number of elements without reallocating. . fn fallible_with_capacity( . alloc: A, . capacity: usize, . fallibility: Fallibility, . ) -> Result { . Ok(Self { 29,176 ( 0.00%) table: RawTableInner::fallible_with_capacity( . alloc, . TableLayout::new::(), . capacity, . fallibility, . )?, . marker: PhantomData, . }) . } -- line 474 ---------------------------------------- -- line 527 ---------------------------------------- . debug_assert_ne!(self.table.bucket_mask, 0); . debug_assert!(index < self.buckets()); . Bucket::from_base_index(self.data_end(), index) . } . . /// Erases an element from the table without dropping it. . #[cfg_attr(feature = "inline-more", inline)] . #[deprecated(since = "0.8.1", note = "use erase or remove instead")] 65,346 ( 0.00%) pub unsafe fn erase_no_drop(&mut self, item: &Bucket) { 65,346 ( 0.00%) let index = self.bucket_index(item); . self.table.erase(index); 130,692 ( 0.00%) } . . /// Erases an element from the table, dropping it in place. . #[cfg_attr(feature = "inline-more", inline)] . #[allow(clippy::needless_pass_by_value)] . #[allow(deprecated)] . pub unsafe fn erase(&mut self, item: Bucket) { . // Erase the element from the table first since drop might panic. 57,746 ( 0.00%) self.erase_no_drop(&item); . item.drop(); . } . . /// Finds and erases an element from the table, dropping it in place. . /// Returns true if an element was found. . #[cfg(feature = "raw")] . #[cfg_attr(feature = "inline-more", inline)] . pub fn erase_entry(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> bool { -- line 554 ---------------------------------------- -- line 563 ---------------------------------------- . } . } . . /// Removes an element from the table, returning it. . #[cfg_attr(feature = "inline-more", inline)] . #[allow(clippy::needless_pass_by_value)] . #[allow(deprecated)] . pub unsafe fn remove(&mut self, item: Bucket) -> T { 72,946 ( 0.00%) self.erase_no_drop(&item); 468 ( 0.00%) item.read() . } . . /// Finds and removes an element from the table, returning it. . #[cfg_attr(feature = "inline-more", inline)] 1,637,136 ( 0.01%) pub fn remove_entry(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option { . // Avoid `Option::map` because it bloats LLVM IR. 4,542 ( 0.00%) match self.find(hash, eq) { 34,389 ( 0.00%) Some(bucket) => Some(unsafe { self.remove(bucket) }), 353,767 ( 0.00%) None => None, . } 2,228,072 ( 0.01%) } . . /// Marks all table buckets as empty without dropping their contents. . #[cfg_attr(feature = "inline-more", inline)] . pub fn clear_no_drop(&mut self) { . self.table.clear_no_drop(); . } . . /// Removes all elements from the table without freeing the backing memory. . #[cfg_attr(feature = "inline-more", inline)] . pub fn clear(&mut self) { . // Ensure that the table is reset even if one of the drops panic . let mut self_ = guard(self, |self_| self_.clear_no_drop()); . unsafe { 1 ( 0.00%) self_.drop_elements(); . } . } . 7 ( 0.00%) unsafe fn drop_elements(&mut self) { 44,854 ( 0.00%) if mem::needs_drop::() && !self.is_empty() { . for item in self.iter() { . item.drop(); . } . } 8 ( 0.00%) } . . /// Shrinks the table to fit `max(self.len(), min_size)` elements. . #[cfg_attr(feature = "inline-more", inline)] . pub fn shrink_to(&mut self, min_size: usize, hasher: impl Fn(&T) -> u64) { . // Calculate the minimal number of elements that we need to reserve . // space for. . let min_size = usize::max(self.table.items, min_size); . if min_size == 0 { -- line 615 ---------------------------------------- -- line 642 ---------------------------------------- . } . } . } . . /// Ensures that at least `additional` items can be inserted into the table . /// without reallocation. . #[cfg_attr(feature = "inline-more", inline)] . pub fn reserve(&mut self, additional: usize, hasher: impl Fn(&T) -> u64) { 935,034 ( 0.01%) if additional > self.table.growth_left { . // Avoid `Result::unwrap_or_else` because it bloats LLVM IR. 654,290 ( 0.00%) if self . .reserve_rehash(additional, hasher, Fallibility::Infallible) . .is_err() . { . unsafe { hint::unreachable_unchecked() } . } . } . } . -- line 660 ---------------------------------------- -- line 671 ---------------------------------------- . } else { . Ok(()) . } . } . . /// Out-of-line slow path for `reserve` and `try_reserve`. . #[cold] . #[inline(never)] 1,425,618 ( 0.01%) fn reserve_rehash( . &mut self, . additional: usize, . hasher: impl Fn(&T) -> u64, . fallibility: Fallibility, . ) -> Result<(), TryReserveError> { . unsafe { . self.table.reserve_rehash_inner( . additional, -- line 687 ---------------------------------------- -- line 690 ---------------------------------------- . TableLayout::new::(), . if mem::needs_drop::() { . Some(mem::transmute(ptr::drop_in_place:: as unsafe fn(*mut T))) . } else { . None . }, . ) . } 1,088,800 ( 0.01%) } . . /// Allocates a new table of a different size and moves the contents of the . /// current table into it. . fn resize( . &mut self, . capacity: usize, . hasher: impl Fn(&T) -> u64, . fallibility: Fallibility, -- line 706 ---------------------------------------- -- line 714 ---------------------------------------- . ) . } . } . . /// Inserts a new element into the table, and returns its raw bucket. . /// . /// This does not check if the given element already exists in the table. . #[cfg_attr(feature = "inline-more", inline)] 5,635,476 ( 0.04%) pub fn insert(&mut self, hash: u64, value: T, hasher: impl Fn(&T) -> u64) -> Bucket { . unsafe { . let mut index = self.table.find_insert_slot(hash); . . // We can avoid growing the table once we have reached our load . // factor if we are replacing a tombstone. This works since the . // number of EMPTY slots does not change in this case. 14,186 ( 0.00%) let old_ctrl = *self.table.ctrl(index); 3,927,772 ( 0.03%) if unlikely(self.table.growth_left == 0 && special_is_empty(old_ctrl)) { . self.reserve(1, hasher); . index = self.table.find_insert_slot(hash); . } . . self.table.record_item_insert_at(index, old_ctrl, hash); . . let bucket = self.bucket(index); 2 ( 0.00%) bucket.write(value); . bucket . } 4,147,100 ( 0.03%) } . . /// Attempts to insert a new element without growing the table and return its raw bucket. . /// . /// Returns an `Err` containing the given element if inserting it would require growing the . /// table. . /// . /// This does not check if the given element already exists in the table. . #[cfg(feature = "raw")] -- line 749 ---------------------------------------- -- line 760 ---------------------------------------- . } . } . } . . /// Inserts a new element into the table, and returns a mutable reference to it. . /// . /// This does not check if the given element already exists in the table. . #[cfg_attr(feature = "inline-more", inline)] 1,293,984 ( 0.01%) pub fn insert_entry(&mut self, hash: u64, value: T, hasher: impl Fn(&T) -> u64) -> &mut T { 68 ( 0.00%) unsafe { self.insert(hash, value, hasher).as_mut() } 970,488 ( 0.01%) } . . /// Inserts a new element into the table, without growing the table. . /// . /// There must be enough space in the table to insert the new element. . /// . /// This does not check if the given element already exists in the table. . #[cfg_attr(feature = "inline-more", inline)] . #[cfg(any(feature = "raw", feature = "rustc-internal-api"))] 8,877 ( 0.00%) pub unsafe fn insert_no_grow(&mut self, hash: u64, value: T) -> Bucket { 925,534 ( 0.01%) let (index, old_ctrl) = self.table.prepare_insert_slot(hash); 58,052 ( 0.00%) let bucket = self.table.bucket(index); . . // If we are replacing a DELETED entry then we don't need to update . // the load counter. 1,921,839 ( 0.01%) self.table.growth_left -= special_is_empty(old_ctrl) as usize; . . bucket.write(value); 1,573,723 ( 0.01%) self.table.items += 1; . bucket 17,597 ( 0.00%) } . . /// Temporary removes a bucket, applying the given function to the removed . /// element and optionally put back the returned value in the same bucket. . /// . /// Returns `true` if the bucket still contains an element . /// . /// This does not check if the given bucket is actually occupied. . #[cfg_attr(feature = "inline-more", inline)] -- line 798 ---------------------------------------- -- line 813 ---------------------------------------- . true . } else { . false . } . } . . /// Searches for an element in the table. . #[inline] 54,898 ( 0.00%) pub fn find(&self, hash: u64, mut eq: impl FnMut(&T) -> bool) -> Option> { 60,697 ( 0.00%) let result = self.table.find_inner(hash, &mut |index| unsafe { 64,586 ( 0.00%) eq(self.bucket(index).as_ref()) 24,817 ( 0.00%) }); . . // Avoid `Option::map` because it bloats LLVM IR. . match result { 8,374 ( 0.00%) Some(index) => Some(unsafe { self.bucket(index) }), . None => None, . } 61,984 ( 0.00%) } . . /// Gets a reference to an element in the table. . #[inline] . pub fn get(&self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option<&T> { . // Avoid `Option::map` because it bloats LLVM IR. 66,536 ( 0.00%) match self.find(hash, eq) { . Some(bucket) => Some(unsafe { bucket.as_ref() }), . None => None, . } . } . . /// Gets a mutable reference to an element in the table. . #[inline] 2,835 ( 0.00%) pub fn get_mut(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option<&mut T> { . // Avoid `Option::map` because it bloats LLVM IR. 31,395 ( 0.00%) match self.find(hash, eq) { . Some(bucket) => Some(unsafe { bucket.as_mut() }), . None => None, . } 3,240 ( 0.00%) } . . /// Attempts to get mutable references to `N` entries in the table at once. . /// . /// Returns an array of length `N` with the results of each query. . /// . /// At most one mutable reference will be returned to any entry. `None` will be returned if any . /// of the hashes are duplicates. `None` will be returned if the hash is not found. . /// -- line 859 ---------------------------------------- -- line 920 ---------------------------------------- . #[inline] . pub fn len(&self) -> usize { . self.table.items . } . . /// Returns `true` if the table contains no elements. . #[inline] . pub fn is_empty(&self) -> bool { 2,437,364 ( 0.02%) self.len() == 0 . } . . /// Returns the number of buckets in the table. . #[inline] . pub fn buckets(&self) -> usize { . self.table.bucket_mask + 1 . } . -- line 936 ---------------------------------------- -- line 938 ---------------------------------------- . /// the caller to ensure that the `RawTable` outlives the `RawIter`. . /// Because we cannot make the `next` method unsafe on the `RawIter` . /// struct, we have to make the `iter` method unsafe. . #[inline] . pub unsafe fn iter(&self) -> RawIter { . let data = Bucket::from_base_index(self.data_end(), 0); . RawIter { . iter: RawIterRange::new(self.table.ctrl.as_ptr(), data, self.table.buckets()), 294,381 ( 0.00%) items: self.table.items, . } . } . . /// Returns an iterator over occupied buckets that could match a given hash. . /// . /// `RawTable` only stores 7 bits of the hash value, so this iterator may . /// return items that have a hash value different than the one provided. You . /// should always validate the returned values before using them. -- line 954 ---------------------------------------- -- line 995 ---------------------------------------- . /// Iteration starts at the provided iterator's current location. . /// . /// It is up to the caller to ensure that the iterator is valid for this . /// `RawTable` and covers all items that remain in the table. . pub unsafe fn into_iter_from(self, iter: RawIter) -> RawIntoIter { . debug_assert_eq!(iter.len(), self.len()); . . let alloc = self.table.alloc.clone(); 20,708 ( 0.00%) let allocation = self.into_allocation(); 15,531 ( 0.00%) RawIntoIter { 25,885 ( 0.00%) iter, . allocation, . marker: PhantomData, . alloc, . } . } . . /// Converts the table into a raw allocation. The contents of the table . /// should be dropped using a `RawIter` before freeing the allocation. . #[cfg_attr(feature = "inline-more", inline)] . pub(crate) fn into_allocation(self) -> Option<(NonNull, Layout)> { 9,548 ( 0.00%) let alloc = if self.table.is_empty_singleton() { . None . } else { . // Avoid `Option::unwrap_or_else` because it bloats LLVM IR. . let (layout, ctrl_offset) = match calculate_layout::(self.table.buckets()) { . Some(lco) => lco, . None => unsafe { hint::unreachable_unchecked() }, . }; . Some(( 1,114 ( 0.00%) unsafe { NonNull::new_unchecked(self.table.ctrl.as_ptr().sub(ctrl_offset)) }, . layout, . )) . }; . mem::forget(self); . alloc . } . } . -- line 1033 ---------------------------------------- -- line 1042 ---------------------------------------- . T: Sync, . A: Sync, . { . } . . impl RawTableInner { . #[inline] . const fn new_in(alloc: A) -> Self { 1,917,045 ( 0.01%) Self { . // Be careful to cast the entire slice to a raw pointer. . ctrl: unsafe { NonNull::new_unchecked(Group::static_empty() as *const _ as *mut u8) }, . bucket_mask: 0, . items: 0, . growth_left: 0, . alloc, . } . } . } . . impl RawTableInner { . #[cfg_attr(feature = "inline-more", inline)] 1,366,089 ( 0.01%) unsafe fn new_uninitialized( . alloc: A, . table_layout: TableLayout, . buckets: usize, . fallibility: Fallibility, . ) -> Result { . debug_assert!(buckets.is_power_of_two()); . . // Avoid `Option::ok_or_else` because it bloats LLVM IR. -- line 1071 ---------------------------------------- -- line 1078 ---------------------------------------- . // exceed `isize::MAX`. We can skip this check on 64-bit systems since . // such allocations will never succeed anyways. . // . // This mirrors what Vec does in the standard library. . if mem::size_of::() < 8 && layout.size() > isize::MAX as usize { . return Err(fallibility.capacity_overflow()); . } . 305,946 ( 0.00%) let ptr: NonNull = match do_alloc(&alloc, layout) { . Ok(block) => block.cast(), . Err(_) => return Err(fallibility.alloc_err(layout)), . }; . . let ctrl = NonNull::new_unchecked(ptr.as_ptr().add(ctrl_offset)); 749,358 ( 0.00%) Ok(Self { . ctrl, 304,899 ( 0.00%) bucket_mask: buckets - 1, . items: 0, . growth_left: bucket_mask_to_capacity(buckets - 1), . alloc, . }) 993,988 ( 0.01%) } . . #[inline] 75,788 ( 0.00%) fn fallible_with_capacity( . alloc: A, . table_layout: TableLayout, . capacity: usize, . fallibility: Fallibility, . ) -> Result { 19,862 ( 0.00%) if capacity == 0 { 16,209 ( 0.00%) Ok(Self::new_in(alloc)) . } else { . unsafe { . let buckets = . capacity_to_buckets(capacity).ok_or_else(|| fallibility.capacity_overflow())?; . 620,604 ( 0.00%) let result = Self::new_uninitialized(alloc, table_layout, buckets, fallibility)?; . result.ctrl(0).write_bytes(EMPTY, result.num_ctrl_bytes()); . 38,673 ( 0.00%) Ok(result) . } . } 75,788 ( 0.00%) } . . /// Searches for an empty or deleted bucket which is suitable for inserting . /// a new element and sets the hash for that slot. . /// . /// There must be at least 1 empty bucket in the table. . #[inline] 328,389 ( 0.00%) unsafe fn prepare_insert_slot(&self, hash: u64) -> (usize, u8) { . let index = self.find_insert_slot(hash); 328,389 ( 0.00%) let old_ctrl = *self.ctrl(index); . self.set_ctrl_h2(index, hash); . (index, old_ctrl) 656,778 ( 0.00%) } . . /// Searches for an empty or deleted bucket which is suitable for inserting . /// a new element. . /// . /// There must be at least 1 empty bucket in the table. . #[inline] . fn find_insert_slot(&self, hash: u64) -> usize { . let mut probe_seq = self.probe_seq(hash); . loop { . unsafe { . let group = Group::load(self.ctrl(probe_seq.pos)); 2,665,084 ( 0.02%) if let Some(bit) = group.match_empty_or_deleted().lowest_set_bit() { 7,815,841 ( 0.05%) let result = (probe_seq.pos + bit) & self.bucket_mask; . . // In tables smaller than the group width, trailing control . // bytes outside the range of the table are filled with . // EMPTY entries. These will unfortunately trigger a . // match, but once masked may point to a full bucket that . // is already occupied. We detect this situation here and . // perform a second scan starting at the beginning of the . // table. This second scan is guaranteed to find an empty . // slot (due to the load factor) before hitting the trailing . // control bytes (containing EMPTY). 3,586,125 ( 0.02%) if unlikely(is_full(*self.ctrl(result))) { . debug_assert!(self.bucket_mask < Group::WIDTH); . debug_assert_ne!(probe_seq.pos, 0); . return Group::load_aligned(self.ctrl(0)) . .match_empty_or_deleted() . .lowest_set_bit_nonzero(); . } . . return result; -- line 1165 ---------------------------------------- -- line 1171 ---------------------------------------- . . /// Searches for an element in the table. This uses dynamic dispatch to reduce the amount of . /// code generated, but it is eliminated by LLVM optimizations. . #[inline] . fn find_inner(&self, hash: u64, eq: &mut dyn FnMut(usize) -> bool) -> Option { . let h2_hash = h2(hash); . let mut probe_seq = self.probe_seq(hash); . 162,596 ( 0.00%) loop { . let group = unsafe { Group::load(self.ctrl(probe_seq.pos)) }; . 9,416,581 ( 0.06%) for bit in group.match_byte(h2_hash) { 18,619,427 ( 0.12%) let index = (probe_seq.pos + bit) & self.bucket_mask; . 12,416,952 ( 0.08%) if likely(eq(index)) { . return Some(index); . } . } . 2,807,659 ( 0.02%) if likely(group.match_empty().any_bit_set()) { . return None; . } . . probe_seq.move_next(self.bucket_mask); . } . } . . #[allow(clippy::mut_mut)] . #[inline] . unsafe fn prepare_rehash_in_place(&mut self) { . // Bulk convert all full control bytes to DELETED, and all DELETED . // control bytes to EMPTY. This effectively frees up all buckets . // containing a DELETED entry. 12 ( 0.00%) for i in (0..self.buckets()).step_by(Group::WIDTH) { . let group = Group::load_aligned(self.ctrl(i)); . let group = group.convert_special_to_empty_and_full_to_deleted(); . group.store_aligned(self.ctrl(i)); . } . . // Fix up the trailing control bytes. See the comments in set_ctrl . // for the handling of tables smaller than the group width. 12 ( 0.00%) if self.buckets() < Group::WIDTH { . self.ctrl(0) . .copy_to(self.ctrl(Group::WIDTH), self.buckets()); . } else { . self.ctrl(0) . .copy_to(self.ctrl(self.buckets()), Group::WIDTH); . } . } . -- line 1220 ---------------------------------------- -- line 1225 ---------------------------------------- . Bucket::from_base_index(self.data_end(), index) . } . . #[inline] . unsafe fn bucket_ptr(&self, index: usize, size_of: usize) -> *mut u8 { . debug_assert_ne!(self.bucket_mask, 0); . debug_assert!(index < self.buckets()); . let base: *mut u8 = self.data_end().as_ptr(); 9,459,360 ( 0.06%) base.sub((index + 1) * size_of) . } . . #[inline] . unsafe fn data_end(&self) -> NonNull { . NonNull::new_unchecked(self.ctrl.as_ptr().cast()) . } . . /// Returns an iterator-like object for a probe sequence on the table. . /// . /// This iterator never terminates, but is guaranteed to visit each bucket . /// group exactly once. The loop using `probe_seq` must terminate upon . /// reaching a group containing an empty bucket. . #[inline] . fn probe_seq(&self, hash: u64) -> ProbeSeq { . ProbeSeq { 51,889,447 ( 0.35%) pos: h1(hash) & self.bucket_mask, . stride: 0, . } . } . . /// Returns the index of a bucket for which a value must be inserted if there is enough rooom . /// in the table, otherwise returns error . #[cfg(feature = "raw")] . #[inline] -- line 1257 ---------------------------------------- -- line 1263 ---------------------------------------- . } else { . self.record_item_insert_at(index, old_ctrl, hash); . Ok(index) . } . } . . #[inline] . unsafe fn record_item_insert_at(&mut self, index: usize, old_ctrl: u8, hash: u64) { 4,909,852 ( 0.03%) self.growth_left -= special_is_empty(old_ctrl) as usize; . self.set_ctrl_h2(index, hash); 3,926,796 ( 0.03%) self.items += 1; . } . . #[inline] . fn is_in_same_group(&self, i: usize, new_i: usize, hash: u64) -> bool { . let probe_seq_pos = self.probe_seq(hash).pos; . let probe_index = . |pos: usize| (pos.wrapping_sub(probe_seq_pos) & self.bucket_mask) / Group::WIDTH; 66 ( 0.00%) probe_index(i) == probe_index(new_i) . } . . /// Sets a control byte to the hash, and possibly also the replicated control byte at . /// the end of the array. . #[inline] . unsafe fn set_ctrl_h2(&self, index: usize, hash: u64) { . self.set_ctrl(index, h2(hash)); . } -- line 1289 ---------------------------------------- -- line 1312 ---------------------------------------- . // replicate the buckets at the end of the trailing group. For example . // with 2 buckets and a group size of 4, the control bytes will look . // like this: . // . // Real | Replicated . // --------------------------------------------- . // | [A] | [B] | [EMPTY] | [EMPTY] | [A] | [B] | . // --------------------------------------------- 7,506,080 ( 0.05%) let index2 = ((index.wrapping_sub(Group::WIDTH)) & self.bucket_mask) + Group::WIDTH; . 2,501,266 ( 0.02%) *self.ctrl(index) = ctrl; 2,502,730 ( 0.02%) *self.ctrl(index2) = ctrl; . } . . /// Returns a pointer to a control byte. . #[inline] . unsafe fn ctrl(&self, index: usize) -> *mut u8 { . debug_assert!(index < self.num_ctrl_bytes()); . self.ctrl.as_ptr().add(index) . } . . #[inline] . fn buckets(&self) -> usize { 902,083 ( 0.01%) self.bucket_mask + 1 . } . . #[inline] . fn num_ctrl_bytes(&self) -> usize { 774,302 ( 0.01%) self.bucket_mask + 1 + Group::WIDTH . } . . #[inline] . fn is_empty_singleton(&self) -> bool { 3,497,766 ( 0.02%) self.bucket_mask == 0 . } . . #[allow(clippy::mut_mut)] . #[inline] . unsafe fn prepare_resize( . &self, . table_layout: TableLayout, . capacity: usize, . fallibility: Fallibility, . ) -> Result, TryReserveError> { . debug_assert!(self.items <= capacity); . . // Allocate and initialize the new table. 6,996 ( 0.00%) let mut new_table = RawTableInner::fallible_with_capacity( . self.alloc.clone(), . table_layout, . capacity, . fallibility, . )?; 408,986 ( 0.00%) new_table.growth_left -= self.items; . new_table.items = self.items; . . // The hash function may panic, in which case we simply free the new . // table without dropping any elements that may have been copied into . // it. . // . // This guard is also used to free the old table on success, see . // the comment at the bottom of this function. . Ok(guard(new_table, move |self_| { 175,703 ( 0.00%) if !self_.is_empty_singleton() { . self_.free_buckets(table_layout); . } . })) . } . . /// Reserves or rehashes to make room for `additional` more elements. . /// . /// This uses dynamic dispatch to reduce the amount of -- line 1383 ---------------------------------------- -- line 1388 ---------------------------------------- . &mut self, . additional: usize, . hasher: &dyn Fn(&mut Self, usize) -> u64, . fallibility: Fallibility, . layout: TableLayout, . drop: Option, . ) -> Result<(), TryReserveError> { . // Avoid `Option::ok_or_else` because it bloats LLVM IR. 351,419 ( 0.00%) let new_items = match self.items.checked_add(additional) { . Some(new_items) => new_items, . None => return Err(fallibility.capacity_overflow()), . }; 351,414 ( 0.00%) let full_capacity = bucket_mask_to_capacity(self.bucket_mask); 767,556 ( 0.01%) if new_items <= full_capacity / 2 { . // Rehash in-place without re-allocating if we have plenty of spare . // capacity that is locked up due to DELETED entries. . self.rehash_in_place(hasher, layout.size, drop); 8 ( 0.00%) Ok(()) . } else { . // Otherwise, conservatively resize to at least the next size up . // to avoid churning deletes into frequent rehashes. . self.resize_inner( 175,703 ( 0.00%) usize::max(new_items, full_capacity + 1), . hasher, . fallibility, . layout, . ) . } . } . . /// Allocates a new table of a different size and moves the contents of the -- line 1418 ---------------------------------------- -- line 1424 ---------------------------------------- . #[inline(always)] . unsafe fn resize_inner( . &mut self, . capacity: usize, . hasher: &dyn Fn(&mut Self, usize) -> u64, . fallibility: Fallibility, . layout: TableLayout, . ) -> Result<(), TryReserveError> { 17,762 ( 0.00%) let mut new_table = self.prepare_resize(layout, capacity, fallibility)?; . . // Copy all elements to the new table. . for i in 0..self.buckets() { 1,499,001 ( 0.01%) if !is_full(*self.ctrl(i)) { . continue; . } . . // This may panic. . let hash = hasher(self, i); . . // We can use a simpler version of insert() here since: . // - there are no DELETED entries. -- line 1444 ---------------------------------------- -- line 1454 ---------------------------------------- . } . . // We successfully copied all elements without panicking. Now replace . // self with the new table. The old table will have its memory freed but . // the items will not be dropped (since they have been moved into the . // new table). . mem::swap(self, &mut new_table); . 175,703 ( 0.00%) Ok(()) . } . . /// Rehashes the contents of the table in place (i.e. without changing the . /// allocation). . /// . /// If `hasher` panics then some the table's contents may be lost. . /// . /// This uses dynamic dispatch to reduce the amount of -- line 1470 ---------------------------------------- -- line 1496 ---------------------------------------- . } . self_.growth_left = bucket_mask_to_capacity(self_.bucket_mask) - self_.items; . }); . . // At this point, DELETED elements are elements that we haven't . // rehashed yet. Find them and re-insert them at their ideal . // position. . 'outer: for i in 0..guard.buckets() { 256 ( 0.00%) if *guard.ctrl(i) != DELETED { . continue; . } . . let i_p = guard.bucket_ptr(i, size_of); . . 'inner: loop { . // Hash the current item . let hash = hasher(*guard, i); -- line 1512 ---------------------------------------- -- line 1515 ---------------------------------------- . let new_i = guard.find_insert_slot(hash); . let new_i_p = guard.bucket_ptr(new_i, size_of); . . // Probing works by scanning through all of the control . // bytes in groups, which may not be aligned to the group . // size. If both the new and old position fall within the . // same unaligned group, then there is no benefit in moving . // it and we can just continue to the next item. 22 ( 0.00%) if likely(guard.is_in_same_group(i, new_i, hash)) { . guard.set_ctrl_h2(i, hash); . continue 'outer; . } . . // We are moving the current item to a new position. Write . // our H2 to the control byte of the new position. . let prev_ctrl = guard.replace_ctrl_h2(new_i, hash); . if prev_ctrl == EMPTY { -- line 1531 ---------------------------------------- -- line 1541 ---------------------------------------- . // swapped into the old slot. . debug_assert_eq!(prev_ctrl, DELETED); . ptr::swap_nonoverlapping(i_p, new_i_p, size_of); . continue 'inner; . } . } . } . 12 ( 0.00%) guard.growth_left = bucket_mask_to_capacity(guard.bucket_mask) - guard.items; . . mem::forget(guard); . } . . #[inline] . unsafe fn free_buckets(&mut self, table_layout: TableLayout) { . // Avoid `Option::unwrap_or_else` because it bloats LLVM IR. . let (layout, ctrl_offset) = match table_layout.calculate_layout_for(self.buckets()) { . Some(lco) => lco, . None => hint::unreachable_unchecked(), . }; . self.alloc.deallocate( 131,091 ( 0.00%) NonNull::new_unchecked(self.ctrl.as_ptr().sub(ctrl_offset)), . layout, . ); . } . . /// Marks all table buckets as empty without dropping their contents. . #[inline] . fn clear_no_drop(&mut self) { 28,522 ( 0.00%) if !self.is_empty_singleton() { . unsafe { . self.ctrl(0).write_bytes(EMPTY, self.num_ctrl_bytes()); . } . } 36,847 ( 0.00%) self.items = 0; 28,552 ( 0.00%) self.growth_left = bucket_mask_to_capacity(self.bucket_mask); . } . . #[inline] . unsafe fn erase(&mut self, index: usize) { . debug_assert!(is_full(*self.ctrl(index))); 268,582 ( 0.00%) let index_before = index.wrapping_sub(Group::WIDTH) & self.bucket_mask; . let empty_before = Group::load(self.ctrl(index_before)).match_empty(); . let empty_after = Group::load(self.ctrl(index)).match_empty(); . . // If we are inside a continuous block of Group::WIDTH full or deleted . // cells then a probe window may have seen a full block when trying to . // insert. We therefore need to keep that block non-empty so that . // lookups will continue searching to the next probe window. . // . // Note that in this context `leading_zeros` refers to the bytes at the . // end of a group, while `trailing_zeros` refers to the bytes at the . // beginning of a group. 1,074,328 ( 0.01%) let ctrl = if empty_before.leading_zeros() + empty_after.trailing_zeros() >= Group::WIDTH { . DELETED . } else { 1,326,985 ( 0.01%) self.growth_left += 1; . EMPTY . }; . self.set_ctrl(index, ctrl); 1,074,328 ( 0.01%) self.items -= 1; . } . } . . impl Clone for RawTable { 17,536 ( 0.00%) fn clone(&self) -> Self { 2,401 ( 0.00%) if self.table.is_empty_singleton() { . Self::new_in(self.table.alloc.clone()) . } else { . unsafe { . let mut new_table = ManuallyDrop::new( . // Avoid `Result::ok_or_else` because it bloats LLVM IR. . match Self::new_uninitialized( . self.table.alloc.clone(), . self.table.buckets(), -- line 1615 ---------------------------------------- -- line 1624 ---------------------------------------- . // We need to free the memory allocated for the new table. . new_table.free_buckets(); . }); . . // Return the newly created table. . ManuallyDrop::into_inner(new_table) . } . } 19,728 ( 0.00%) } . . fn clone_from(&mut self, source: &Self) { . if source.table.is_empty_singleton() { . *self = Self::new_in(self.table.alloc.clone()); . } else { . unsafe { . // First, drop all our elements without clearing the control bytes. . self.drop_elements(); -- line 1640 ---------------------------------------- -- line 1687 ---------------------------------------- . .table . .ctrl(0) . .copy_to_nonoverlapping(self.table.ctrl(0), self.table.num_ctrl_bytes()); . source . .data_start() . .copy_to_nonoverlapping(self.data_start(), self.table.buckets()); . . self.table.items = source.table.items; 376 ( 0.00%) self.table.growth_left = source.table.growth_left; . } . } . . impl RawTable { . /// Common code for clone and clone_from. Assumes `self.buckets() == source.buckets()`. . #[cfg_attr(feature = "inline-more", inline)] . unsafe fn clone_from_impl(&mut self, source: &Self, mut on_panic: impl FnMut(&mut Self)) { . // Copy the control bytes unchanged. We do this in a single pass -- line 1703 ---------------------------------------- -- line 1790 ---------------------------------------- . fn default() -> Self { . Self::new_in(Default::default()) . } . } . . #[cfg(feature = "nightly")] . unsafe impl<#[may_dangle] T, A: Allocator + Clone> Drop for RawTable { . #[cfg_attr(feature = "inline-more", inline)] 1,782,923 ( 0.01%) fn drop(&mut self) { 1,501,218 ( 0.01%) if !self.table.is_empty_singleton() { . unsafe { . self.drop_elements(); . self.free_buckets(); . } . } 1,884,120 ( 0.01%) } . } . #[cfg(not(feature = "nightly"))] . impl Drop for RawTable { . #[cfg_attr(feature = "inline-more", inline)] . fn drop(&mut self) { . if !self.table.is_empty_singleton() { . unsafe { . self.drop_elements(); -- line 1813 ---------------------------------------- -- line 1817 ---------------------------------------- . } . } . . impl IntoIterator for RawTable { . type Item = T; . type IntoIter = RawIntoIter; . . #[cfg_attr(feature = "inline-more", inline)] 20,708 ( 0.00%) fn into_iter(self) -> RawIntoIter { . unsafe { . let iter = self.iter(); . self.into_iter_from(iter) . } 25,885 ( 0.00%) } . } . . /// Iterator over a sub-range of a table. Unlike `RawIter` this iterator does . /// not track an item count. . pub(crate) struct RawIterRange { . // Mask of full buckets in the current group. Bits are cleared from this . // mask as each element is processed. . current_group: BitMask, -- line 1838 ---------------------------------------- -- line 1934 ---------------------------------------- . . impl Iterator for RawIterRange { . type Item = Bucket; . . #[cfg_attr(feature = "inline-more", inline)] . fn next(&mut self) -> Option> { . unsafe { . loop { 898,732 ( 0.01%) if let Some(index) = self.current_group.lowest_set_bit() { 96,511 ( 0.00%) self.current_group = self.current_group.remove_lowest_bit(); 164,715 ( 0.00%) return Some(self.data.next_n(index)); . } . 1,117,255 ( 0.01%) if self.next_ctrl >= self.end { . return None; . } . . // We might read past self.end up to the next group boundary, . // but this is fine because it only occurs on tables smaller . // than the group size where the trailing control bytes are all . // EMPTY. On larger tables self.end is guaranteed to be aligned . // to the group size (since tables are power-of-two sized). 12,003 ( 0.00%) self.current_group = Group::load_aligned(self.next_ctrl).match_full(); 14,191 ( 0.00%) self.data = self.data.next_n(Group::WIDTH); 18,818 ( 0.00%) self.next_ctrl = self.next_ctrl.add(Group::WIDTH); . } . } . } . . #[inline] . fn size_hint(&self) -> (usize, Option) { . // We don't have an item count, so just guess based on the range size. . ( -- line 1966 ---------------------------------------- -- line 2102 ---------------------------------------- . } . } else { . // We must have already iterated past the removed item. . } . } . } . . unsafe fn drop_elements(&mut self) { 4,651 ( 0.00%) if mem::needs_drop::() && self.len() != 0 { . for item in self { . item.drop(); . } . } . } . } . . impl Clone for RawIter { -- line 2118 ---------------------------------------- -- line 2124 ---------------------------------------- . } . } . } . . impl Iterator for RawIter { . type Item = Bucket; . . #[cfg_attr(feature = "inline-more", inline)] 122,678 ( 0.00%) fn next(&mut self) -> Option> { 241,494 ( 0.00%) if let Some(b) = self.iter.next() { 2,663,186 ( 0.02%) self.items -= 1; . Some(b) . } else { . // We don't check against items == 0 here to allow the . // compiler to optimize away the item count entirely if the . // iterator length is never queried. . debug_assert_eq!(self.items, 0); . None . } 245,356 ( 0.00%) } . . #[inline] . fn size_hint(&self) -> (usize, Option) { . (self.items, Some(self.items)) . } . } . . impl ExactSizeIterator for RawIter {} -- line 2151 ---------------------------------------- -- line 2177 ---------------------------------------- . T: Sync, . A: Sync, . { . } . . #[cfg(feature = "nightly")] . unsafe impl<#[may_dangle] T, A: Allocator + Clone> Drop for RawIntoIter { . #[cfg_attr(feature = "inline-more", inline)] 6,944 ( 0.00%) fn drop(&mut self) { . unsafe { . // Drop all remaining elements . self.iter.drop_elements(); . . // Free the table 44,987 ( 0.00%) if let Some((ptr, layout)) = self.allocation { . self.alloc.deallocate(ptr, layout); . } . } 1,730 ( 0.00%) } . } . #[cfg(not(feature = "nightly"))] . impl Drop for RawIntoIter { . #[cfg_attr(feature = "inline-more", inline)] . fn drop(&mut self) { . unsafe { . // Drop all remaining elements . self.iter.drop_elements(); -- line 2203 ---------------------------------------- -- line 2209 ---------------------------------------- . } . } . } . . impl Iterator for RawIntoIter { . type Item = T; . . #[cfg_attr(feature = "inline-more", inline)] 3,425 ( 0.00%) fn next(&mut self) -> Option { 2,259 ( 0.00%) unsafe { Some(self.iter.next()?.read()) } 7,954 ( 0.00%) } . . #[inline] . fn size_hint(&self) -> (usize, Option) { 4 ( 0.00%) self.iter.size_hint() . } . } . . impl ExactSizeIterator for RawIntoIter {} . impl FusedIterator for RawIntoIter {} . . /// Iterator which consumes elements without freeing the table storage. . pub struct RawDrain<'a, T, A: Allocator + Clone = Global> { -- line 2231 ---------------------------------------- -- line 2259 ---------------------------------------- . where . T: Sync, . A: Sync, . { . } . . impl Drop for RawDrain<'_, T, A> { . #[cfg_attr(feature = "inline-more", inline)] 5,120 ( 0.00%) fn drop(&mut self) { . unsafe { . // Drop all remaining elements. Note that this may panic. . self.iter.drop_elements(); . . // Reset the contents of the table now that all elements have been . // dropped. . self.table.clear_no_drop(); . . // Move the now empty table back to its original location. 640 ( 0.00%) self.orig_table . .as_ptr() . .copy_from_nonoverlapping(&*self.table, 1); . } 5,120 ( 0.00%) } . } . . impl Iterator for RawDrain<'_, T, A> { . type Item = T; . . #[cfg_attr(feature = "inline-more", inline)] . fn next(&mut self) -> Option { . unsafe { -- line 2289 ---------------------------------------- 33,253,740 ( 0.22%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_data_structures/src/obligation_forest/mod.rs -------------------------------------------------------------------------------- Ir -- line 121 ---------------------------------------- . #[derive(Debug)] . pub enum ProcessResult { . Unchanged, . Changed(Vec), . Error(E), . } . . #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)] 85,669 ( 0.00%) struct ObligationTreeId(usize); . . type ObligationTreeIdGenerator = . std::iter::Map, fn(usize) -> ObligationTreeId>; . . pub struct ObligationForest { . /// The list of obligations. In between calls to `process_obligations`, . /// this list only contains nodes in the `Pending` or `Waiting` state. . /// -- line 137 ---------------------------------------- -- line 181 ---------------------------------------- . has_parent: bool, . . /// Identifier of the obligation tree to which this node belongs. . obligation_tree_id: ObligationTreeId, . } . . impl Node { . fn new(parent: Option, obligation: O, obligation_tree_id: ObligationTreeId) -> Node { 1,052,816 ( 0.01%) Node { . obligation, . state: Cell::new(NodeState::Pending), 134,711 ( 0.00%) dependents: if let Some(parent_index) = parent { vec![parent_index] } else { vec![] }, . has_parent: parent.is_some(), . obligation_tree_id, . } . } . } . . /// The state of one node in some tree within the forest. This represents the . /// current state of processing for the obligation (of type `O`) associated -- line 200 ---------------------------------------- -- line 223 ---------------------------------------- . /// | compress() . /// v . /// (Removed) . /// ``` . /// The `Error` state can be introduced in several places, via `error_at()`. . /// . /// Outside of `ObligationForest` methods, nodes should be either `Pending` or . /// `Waiting`. 7,147,960 ( 0.05%) #[derive(Debug, Copy, Clone, PartialEq, Eq)] . enum NodeState { . /// This obligation has not yet been selected successfully. Cannot have . /// subobligations. . Pending, . . /// This obligation was selected successfully, but may or may not have . /// subobligations. . Success, -- line 239 ---------------------------------------- -- line 279 ---------------------------------------- . pub stalled: bool, . } . . impl OutcomeTrait for Outcome { . type Error = Error; . type Obligation = O; . . fn new() -> Self { 161,064 ( 0.00%) Self { stalled: true, errors: vec![] } . } . . fn mark_not_stalled(&mut self) { 65,346 ( 0.00%) self.stalled = false; . } . . fn is_stalled(&self) -> bool { 36,354 ( 0.00%) self.stalled . } . . fn record_completed(&mut self, _outcome: &Self::Obligation) { . // do nothing . } . . fn record_error(&mut self, error: Self::Error) { 144 ( 0.00%) self.errors.push(error) . } . } . . #[derive(Debug, PartialEq, Eq)] . pub struct Error { . pub error: E, . pub backtrace: Vec, . } . . impl ObligationForest { 20,299 ( 0.00%) pub fn new() -> ObligationForest { 243,588 ( 0.00%) ObligationForest { . nodes: vec![], . done_cache: Default::default(), . active_cache: Default::default(), . reused_node_vec: vec![], . obligation_tree_id_generator: (0..).map(ObligationTreeId), . error_cache: Default::default(), . } 20,299 ( 0.00%) } . . /// Returns the total number of nodes in the forest that have not . /// yet been fully resolved. . pub fn len(&self) -> usize { . self.nodes.len() . } . . /// Registers an obligation. . pub fn register_obligation(&mut self, obligation: O) { . // Ignore errors here - there is no guarantee of success. 716,677 ( 0.00%) let _ = self.register_obligation_at(obligation, None); . } . . // Returns Err(()) if we already know this obligation failed. 982,575 ( 0.01%) fn register_obligation_at(&mut self, obligation: O, parent: Option) -> Result<(), ()> { 178,650 ( 0.00%) let cache_key = obligation.as_cache_key(); 178,650 ( 0.00%) if self.done_cache.contains(&cache_key) { . debug!("register_obligation_at: ignoring already done obligation: {:?}", obligation); . return Ok(()); . } . 430,458 ( 0.00%) match self.active_cache.entry(cache_key) { . Entry::Occupied(o) => { 11,884 ( 0.00%) let node = &mut self.nodes[*o.get()]; 11,884 ( 0.00%) if let Some(parent_index) = parent { . // If the node is already in `active_cache`, it has already . // had its chance to be marked with a parent. So if it's . // not already present, just dump `parent` into the . // dependents as a non-parent. 8,847 ( 0.00%) if !node.dependents.contains(&parent_index) { . node.dependents.push(parent_index); . } . } 17,826 ( 0.00%) if let NodeState::Error = node.state.get() { Err(()) } else { Ok(()) } . } 197,403 ( 0.00%) Entry::Vacant(v) => { 394,806 ( 0.00%) let obligation_tree_id = match parent { 45,940 ( 0.00%) Some(parent_index) => self.nodes[parent_index].obligation_tree_id, . None => self.obligation_tree_id_generator.next().unwrap(), . }; . . let already_failed = parent.is_some() . && self . .error_cache . .get(&obligation_tree_id) . .map_or(false, |errors| errors.contains(v.key())); . . if already_failed { . Err(()) . } else { 65,801 ( 0.00%) let new_index = self.nodes.len(); . v.insert(new_index); . self.nodes.push(Node::new(parent, obligation, obligation_tree_id)); . Ok(()) . } . } . } 803,925 ( 0.01%) } . . /// Converts all remaining obligations to the given error. 234,584 ( 0.00%) pub fn to_errors(&mut self, error: E) -> Vec> { . let errors = self . .nodes . .iter() . .enumerate() . .filter(|(_index, node)| node.state.get() == NodeState::Pending) . .map(|(index, _node)| Error { error: error.clone(), backtrace: self.error_at(index) }) . .collect(); . 67,024 ( 0.00%) self.compress(|_| assert!(false)); . errors 201,072 ( 0.00%) } . . /// Returns the set of obligations that are in a pending state. . pub fn map_pending_obligations(&self, f: F) -> Vec

. where . F: Fn(&O) -> P, . { . self.nodes . .iter() . .filter(|node| node.state.get() == NodeState::Pending) . .map(|node| f(&node.obligation)) . .collect() . } . 112 ( 0.00%) fn insert_into_error_cache(&mut self, index: usize) { . let node = &self.nodes[index]; 16 ( 0.00%) self.error_cache 48 ( 0.00%) .entry(node.obligation_tree_id) . .or_default() . .insert(node.obligation.as_cache_key()); 128 ( 0.00%) } . . /// Performs a pass through the obligation list. This must . /// be called in a loop until `outcome.stalled` is false. . /// . /// This _cannot_ be unrolled (presently, at least). . #[inline(never)] 724,788 ( 0.00%) pub fn process_obligations(&mut self, processor: &mut P) -> OUT . where . P: ObligationProcessor, . OUT: OutcomeTrait>, . { . let mut outcome = OUT::new(); . . // Note that the loop body can append new nodes, and those new nodes . // will then be processed by subsequent iterations of the loop. . // . // We can't use an iterator for the loop because `self.nodes` is . // appended to and the borrow checker would complain. We also can't use . // `for index in 0..self.nodes.len() { ... }` because the range would . // be computed with the initial length, and we would miss the appended . // nodes. Therefore we use a `while` loop. . let mut index = 0; 3,319,729 ( 0.02%) while let Some(node) = self.nodes.get_mut(index) { . // `processor.process_obligation` can modify the predicate within . // `node.obligation`, and that predicate is the key used for . // `self.active_cache`. This means that `self.active_cache` can get . // out of sync with `nodes`. It's not very common, but it does . // happen, and code in `compress` has to allow for it. 6,478,394 ( 0.04%) if node.state.get() != NodeState::Pending { 31,401 ( 0.00%) index += 1; . continue; . } . 407,799 ( 0.00%) match processor.process_obligation(&mut node.obligation) { . ProcessResult::Unchanged => { . // No change in state. . } 261,348 ( 0.00%) ProcessResult::Changed(children) => { . // We are not (yet) stalled. . outcome.mark_not_stalled(); . node.state.set(NodeState::Success); . 329,740 ( 0.00%) for child in children { 581,332 ( 0.00%) let st = self.register_obligation_at(child, Some(index)); 68,392 ( 0.00%) if let Err(()) = st { . // Error already reported - propagate it . // to our node. . self.error_at(index); . } . } . } . ProcessResult::Error(err) => { . outcome.mark_not_stalled(); 297 ( 0.00%) outcome.record_error(Error { error: err, backtrace: self.error_at(index) }); . } . } 6,415,592 ( 0.04%) index += 1; . } . . // There's no need to perform marking, cycle processing and compression when nothing . // changed. 36,354 ( 0.00%) if !outcome.is_stalled() { . self.mark_successes(); . self.process_cycles(processor); 36,534 ( 0.00%) self.compress(|obl| outcome.record_completed(obl)); . } . . outcome 724,788 ( 0.00%) } . . /// Returns a vector of obligations for `p` and all of its . /// ancestors, putting them into the error state in the process. 63 ( 0.00%) fn error_at(&self, mut index: usize) -> Vec { . let mut error_stack: Vec = vec![]; . let mut trace = vec![]; . . loop { . let node = &self.nodes[index]; 16 ( 0.00%) node.state.set(NodeState::Error); . trace.push(node.obligation.clone()); 32 ( 0.00%) if node.has_parent { . // The first dependent is the parent, which is treated . // specially. . error_stack.extend(node.dependents.iter().skip(1)); 7 ( 0.00%) index = node.dependents[0]; . } else { . // No parent; treat all dependents non-specially. . error_stack.extend(node.dependents.iter()); . break; . } . } . . while let Some(index) = error_stack.pop() { -- line 508 ---------------------------------------- -- line 509 ---------------------------------------- . let node = &self.nodes[index]; . if node.state.get() != NodeState::Error { . node.state.set(NodeState::Error); . error_stack.extend(node.dependents.iter()); . } . } . . trace 72 ( 0.00%) } . . /// Mark all `Waiting` nodes as `Success`, except those that depend on a . /// pending node. . fn mark_successes(&self) { . // Convert all `Waiting` nodes to `Success`. . for node in &self.nodes { 1,495,032 ( 0.01%) if node.state.get() == NodeState::Waiting { . node.state.set(NodeState::Success); . } . } . . // Convert `Success` nodes that depend on a pending node back to . // `Waiting`. . for node in &self.nodes { 1,266,321 ( 0.01%) if node.state.get() == NodeState::Pending { . // This call site is hot. . self.inlined_mark_dependents_as_waiting(node); . } . } . } . . // This always-inlined function is for the hot call site. . #[inline(always)] . fn inlined_mark_dependents_as_waiting(&self, node: &Node) { 19,048 ( 0.00%) for &index in node.dependents.iter() { . let node = &self.nodes[index]; 19,048 ( 0.00%) let state = node.state.get(); 19,048 ( 0.00%) if state == NodeState::Success { . // This call site is cold. 35,466 ( 0.00%) self.uninlined_mark_dependents_as_waiting(node); . } else { . debug_assert!(state == NodeState::Waiting || state == NodeState::Error) . } . } . } . . // This never-inlined function is for the cold call site. . #[inline(never)] 82,754 ( 0.00%) fn uninlined_mark_dependents_as_waiting(&self, node: &Node) { . // Mark node Waiting in the cold uninlined code instead of the hot inlined . node.state.set(NodeState::Waiting); . self.inlined_mark_dependents_as_waiting(node) 94,576 ( 0.00%) } . . /// Report cycles between all `Success` nodes, and convert all `Success` . /// nodes to `Done`. This must be called after `mark_successes`. . fn process_cycles

(&mut self, processor: &mut P) . where . P: ObligationProcessor, . { 18,267 ( 0.00%) let mut stack = std::mem::take(&mut self.reused_node_vec); . for (index, node) in self.nodes.iter().enumerate() { . // For some benchmarks this state test is extremely hot. It's a win . // to handle the no-op cases immediately to avoid the cost of the . // function call. 1,266,321 ( 0.01%) if node.state.get() == NodeState::Success { 322,535 ( 0.00%) self.find_cycles_from_node(&mut stack, processor, index); . } . } . . debug_assert!(stack.is_empty()); 146,136 ( 0.00%) self.reused_node_vec = stack; . } . 811,170 ( 0.01%) fn find_cycles_from_node

(&self, stack: &mut Vec, processor: &mut P, index: usize) . where . P: ObligationProcessor, . { . let node = &self.nodes[index]; 180,260 ( 0.00%) if node.state.get() == NodeState::Success { 1,698 ( 0.00%) match stack.iter().rposition(|&n| n == index) { . None => { . stack.push(index); 25,623 ( 0.00%) for &dep_index in node.dependents.iter() { 102,492 ( 0.00%) self.find_cycles_from_node(stack, processor, dep_index); . } . stack.pop(); . node.state.set(NodeState::Done); . } . Some(rpos) => { . // Cycle detected. . processor.process_backedge( . stack[rpos..].iter().map(|&i| &self.nodes[i].obligation), . PhantomData, . ); . } . } . } 721,040 ( 0.00%) } . . /// Compresses the vector, removing all popped nodes. This adjusts the . /// indices and hence invalidates any outstanding indices. `process_cycles` . /// must be run beforehand to remove any cycles on `Success` nodes. . #[inline(never)] 380,720 ( 0.00%) fn compress(&mut self, mut outcome_cb: impl FnMut(&O)) { 51,779 ( 0.00%) let orig_nodes_len = self.nodes.len(); . let mut node_rewrites: Vec<_> = std::mem::take(&mut self.reused_node_vec); . debug_assert!(node_rewrites.is_empty()); . node_rewrites.extend(0..orig_nodes_len); . let mut dead_nodes = 0; . . // Move removable nodes to the end, preserving the order of the . // remaining nodes. . // . // LOOP INVARIANT: . // self.nodes[0..index - dead_nodes] are the first remaining nodes . // self.nodes[index - dead_nodes..index] are all dead . // self.nodes[index..] are unchanged . for index in 0..orig_nodes_len { . let node = &self.nodes[index]; 6,404,673 ( 0.04%) match node.state.get() { . NodeState::Pending | NodeState::Waiting => { 2,401,950 ( 0.02%) if dead_nodes > 0 { 843,102 ( 0.01%) self.nodes.swap(index, index - dead_nodes); 1,405,170 ( 0.01%) node_rewrites[index] -= dead_nodes; . } . } . NodeState::Done => { . // This lookup can fail because the contents of . // `self.active_cache` are not guaranteed to match those of . // `self.nodes`. See the comment in `process_obligation` . // for more details. 232,447 ( 0.00%) if let Some((predicate, _)) = 195,990 ( 0.00%) self.active_cache.remove_entry(&node.obligation.as_cache_key()) . { . self.done_cache.insert(predicate); . } else { . self.done_cache.insert(node.obligation.as_cache_key().clone()); . } . // Extract the success stories. . outcome_cb(&node.obligation); 130,660 ( 0.00%) node_rewrites[index] = orig_nodes_len; 130,660 ( 0.00%) dead_nodes += 1; . } . NodeState::Error => { . // We *intentionally* remove the node from the cache at this point. Otherwise . // tests must come up with a different type on every type error they . // check against. 48 ( 0.00%) self.active_cache.remove(&node.obligation.as_cache_key()); 32 ( 0.00%) self.insert_into_error_cache(index); 32 ( 0.00%) node_rewrites[index] = orig_nodes_len; 32 ( 0.00%) dead_nodes += 1; . } . NodeState::Success => unreachable!(), . } . } . . if dead_nodes > 0 { . // Remove the dead nodes and rewrite indices. 33,210 ( 0.00%) self.nodes.truncate(orig_nodes_len - dead_nodes); 16,605 ( 0.00%) self.apply_rewrites(&node_rewrites); . } . . node_rewrites.truncate(0); 207,116 ( 0.00%) self.reused_node_vec = node_rewrites; 414,232 ( 0.00%) } . . #[inline(never)] 149,445 ( 0.00%) fn apply_rewrites(&mut self, node_rewrites: &[usize]) { . let orig_nodes_len = node_rewrites.len(); . . for node in &mut self.nodes { . let mut i = 0; 985,328 ( 0.01%) while let Some(dependent) = node.dependents.get_mut(i) { 59,120 ( 0.00%) let new_index = node_rewrites[*dependent]; 29,560 ( 0.00%) if new_index >= orig_nodes_len { . node.dependents.swap_remove(i); . if i == 0 && node.has_parent { . // We just removed the parent. . node.has_parent = false; . } . } else { 14,780 ( 0.00%) *dependent = new_index; 29,560 ( 0.00%) i += 1; . } . } . } . . // This updating of `self.active_cache` is necessary because the . // removal of nodes within `compress` can fail. See above. . self.active_cache.retain(|_predicate, index| { 3,997,684 ( 0.03%) let new_index = node_rewrites[*index]; 1,998,842 ( 0.01%) if new_index >= orig_nodes_len { . false . } else { 970,548 ( 0.01%) *index = new_index; . true . } . }); 132,840 ( 0.00%) } . } 8,256,684 ( 0.05%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/library/core/src/cell.rs -------------------------------------------------------------------------------- Ir -- line 346 ---------------------------------------- . /// . /// let c = Cell::new(5); . /// . /// c.set(10); . /// ``` . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn set(&self, val: T) { 4,014 ( 0.00%) let old = self.replace(val); 5,404 ( 0.00%) drop(old); . } . . /// Swaps the values of two `Cell`s. . /// Difference with `std::mem::swap` is that this function doesn't require `&mut` reference. . /// . /// # Examples . /// . /// ``` -- line 363 ---------------------------------------- -- line 434 ---------------------------------------- . /// . /// let five = c.get(); . /// ``` . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn get(&self) -> T { . // SAFETY: This can cause data races if called from a separate thread, . // but `Cell` is `!Sync` so this won't happen. 392,869 ( 0.00%) unsafe { *self.value.get() } . } . . /// Updates the contained value using a function and returns the new value. . /// . /// # Examples . /// . /// ``` . /// #![feature(cell_update)] -- line 450 ---------------------------------------- -- line 689 ---------------------------------------- . . #[inline(always)] . fn is_writing(x: BorrowFlag) -> bool { . x < UNUSED . } . . #[inline(always)] . fn is_reading(x: BorrowFlag) -> bool { 957,032 ( 0.01%) x > UNUSED . } . . impl RefCell { . /// Creates a new `RefCell` containing `value`. . /// . /// # Examples . /// . /// ``` -- line 705 ---------------------------------------- -- line 706 ---------------------------------------- . /// use std::cell::RefCell; . /// . /// let c = RefCell::new(5); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_refcell_new", since = "1.24.0")] . #[inline] . pub const fn new(value: T) -> RefCell { 167,037 ( 0.00%) RefCell { 126,786 ( 0.00%) value: UnsafeCell::new(value), . borrow: Cell::new(UNUSED), . #[cfg(feature = "debug_refcell")] . borrowed_at: Cell::new(None), . } . } . . /// Consumes the `RefCell`, returning the wrapped value. . /// -- line 723 ---------------------------------------- -- line 731 ---------------------------------------- . /// let five = c.into_inner(); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_cell_into_inner", issue = "78729")] . #[inline] . pub const fn into_inner(self) -> T { . // Since this function takes `self` (the `RefCell`) by value, the . // compiler statically verifies that it is not currently borrowed. 7,532 ( 0.00%) self.value.into_inner() . } . . /// Replaces the wrapped value with a new one, returning the old value, . /// without deinitializing either one. . /// . /// This function corresponds to [`std::mem::replace`](../mem/fn.replace.html). . /// . /// # Panics -- line 747 ---------------------------------------- -- line 845 ---------------------------------------- . /// let c = RefCell::new(5); . /// . /// let m = c.borrow_mut(); . /// let b = c.borrow(); // this causes a panic . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . #[track_caller] 22,070 ( 0.00%) pub fn borrow(&self) -> Ref<'_, T> { . self.try_borrow().expect("already mutably borrowed") 66,210 ( 0.00%) } . . /// Immutably borrows the wrapped value, returning an error if the value is currently mutably . /// borrowed. . /// . /// The borrow lasts until the returned `Ref` exits scope. Multiple immutable borrows can be . /// taken out at the same time. . /// . /// This is the non-panicking variant of [`borrow`](#method.borrow). -- line 863 ---------------------------------------- -- line 937 ---------------------------------------- . /// let c = RefCell::new(5); . /// let m = c.borrow(); . /// . /// let b = c.borrow_mut(); // this causes a panic . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . #[track_caller] 83,628 ( 0.00%) pub fn borrow_mut(&self) -> RefMut<'_, T> { . self.try_borrow_mut().expect("already borrowed") 250,884 ( 0.00%) } . . /// Mutably borrows the wrapped value, returning an error if the value is currently borrowed. . /// . /// The borrow lasts until the returned `RefMut` or all `RefMut`s derived . /// from it exit scope. The value cannot be borrowed while this borrow is . /// active. . /// . /// This is the non-panicking variant of [`borrow_mut`](#method.borrow_mut). -- line 955 ---------------------------------------- -- line 975 ---------------------------------------- . match BorrowRefMut::new(&self.borrow) { . Some(b) => { . #[cfg(feature = "debug_refcell")] . { . self.borrowed_at.set(Some(crate::panic::Location::caller())); . } . . // SAFETY: `BorrowRef` guarantees unique access. 1,171 ( 0.00%) Ok(RefMut { value: unsafe { &mut *self.value.get() }, borrow: b }) . } . None => Err(BorrowMutError { . // If a borrow occurred, then we must already have an outstanding borrow, . // so `borrowed_at` will be `Some` . #[cfg(feature = "debug_refcell")] . location: self.borrowed_at.get().unwrap(), . }), . } -- line 991 ---------------------------------------- -- line 1254 ---------------------------------------- . . struct BorrowRef<'b> { . borrow: &'b Cell, . } . . impl<'b> BorrowRef<'b> { . #[inline] . fn new(borrow: &'b Cell) -> Option> { 1,395,127 ( 0.01%) let b = borrow.get().wrapping_add(1); 841,481 ( 0.01%) if !is_reading(b) { . // Incrementing borrow can result in a non-reading value (<= 0) in these cases: . // 1. It was < 0, i.e. there are writing borrows, so we can't allow a read borrow . // due to Rust's reference aliasing rules . // 2. It was isize::MAX (the max amount of reading borrows) and it overflowed . // into isize::MIN (the max amount of writing borrows) so we can't allow . // an additional read borrow because isize can't represent so many read borrows . // (this can only happen if you mem::forget more than a small constant amount of . // `Ref`s, which is not good practice) -- line 1271 ---------------------------------------- -- line 1279 ---------------------------------------- . Some(BorrowRef { borrow }) . } . } . } . . impl Drop for BorrowRef<'_> { . #[inline] . fn drop(&mut self) { 574,103 ( 0.00%) let borrow = self.borrow.get(); . debug_assert!(is_reading(borrow)); 1,165,439 ( 0.01%) self.borrow.set(borrow - 1); . } . } . . impl Clone for BorrowRef<'_> { . #[inline] . fn clone(&self) -> Self { . // Since this Ref exists, we know the borrow flag . // is a reading borrow. -- line 1297 ---------------------------------------- -- line 1645 ---------------------------------------- . . struct BorrowRefMut<'b> { . borrow: &'b Cell, . } . . impl Drop for BorrowRefMut<'_> { . #[inline] . fn drop(&mut self) { 11,798,820 ( 0.08%) let borrow = self.borrow.get(); . debug_assert!(is_writing(borrow)); 23,437,704 ( 0.16%) self.borrow.set(borrow + 1); . } . } . . impl<'b> BorrowRefMut<'b> { . #[inline] . fn new(borrow: &'b Cell) -> Option> { . // NOTE: Unlike BorrowRefMut::clone, new is called to create the initial . // mutable reference, and so there must currently be no existing . // references. Thus, while clone increments the mutable refcount, here . // we explicitly only allow going from UNUSED to UNUSED - 1. 24,562,341 ( 0.16%) match borrow.get() { . UNUSED => { . borrow.set(UNUSED - 1); . Some(BorrowRefMut { borrow }) . } . _ => None, . } . } . -- line 1674 ---------------------------------------- -- line 1711 ---------------------------------------- . self.value . } . } . . #[stable(feature = "rust1", since = "1.0.0")] . impl DerefMut for RefMut<'_, T> { . #[inline] . fn deref_mut(&mut self) -> &mut T { 3,507 ( 0.00%) self.value . } . } . . #[unstable(feature = "coerce_unsized", issue = "27732")] . impl<'b, T: ?Sized + Unsize, U: ?Sized> CoerceUnsized> for RefMut<'b, T> {} . . #[stable(feature = "std_guard_impls", since = "1.20.0")] . impl fmt::Display for RefMut<'_, T> { -- line 1727 ---------------------------------------- -- line 1909 ---------------------------------------- . /// ``` . #[inline(always)] . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_unsafecell_get", since = "1.32.0")] . pub const fn get(&self) -> *mut T { . // We can just cast the pointer from `UnsafeCell` to `T` because of . // #[repr(transparent)]. This exploits libstd's special status, there is . // no guarantee for user code that this will work in future versions of the compiler! 6,697,141 ( 0.04%) self as *const UnsafeCell as *const T as *mut T . } . . /// Returns a mutable reference to the underlying data. . /// . /// This call borrows the `UnsafeCell` mutably (at compile-time) which . /// guarantees that we possess the only reference. . /// . /// # Examples -- line 1925 ---------------------------------------- 16,782,189 ( 0.11%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_trait_selection/src/traits/fulfill.rs -------------------------------------------------------------------------------- Ir -- line 33 ---------------------------------------- . . impl<'tcx> ForestObligation for PendingPredicateObligation<'tcx> { . /// Note that we include both the `ParamEnv` and the `Predicate`, . /// as the `ParamEnv` can influence whether fulfillment succeeds . /// or fails. . type CacheKey = ty::ParamEnvAnd<'tcx, ty::Predicate<'tcx>>; . . fn as_cache_key(&self) -> Self::CacheKey { 550,680 ( 0.00%) self.obligation.param_env.and(self.obligation.predicate) . } . } . . /// The fulfillment context is used to drive trait resolution. It . /// consists of a list of obligations that must be (eventually) . /// satisfied. The job is to track which are satisfied, which yielded . /// errors, and which are still pending. At any point, users can call . /// `select_where_possible`, and the fulfillment context will try to do -- line 49 ---------------------------------------- -- line 79 ---------------------------------------- . // outside of any snapshot, so any use of it inside a snapshot . // will lead to trouble and therefore is checked against, but . // other fulfillment contexts sometimes do live inside of . // a snapshot (they don't *straddle* a snapshot, so there . // is no trouble there). . usable_in_snapshot: bool, . } . 160 ( 0.00%) #[derive(Clone, Debug)] . pub struct PendingPredicateObligation<'tcx> { . pub obligation: PredicateObligation<'tcx>, . // This is far more often read than modified, meaning that we . // should mostly optimize for reading speed, while modifying is not as relevant. . // . // For whatever reason using a boxed slice is slower than using a `Vec` here. . pub stalled_on: Vec>, . } . . // `PendingPredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger. . #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))] . static_assert_size!(PendingPredicateObligation<'_>, 72); . . impl<'a, 'tcx> FulfillmentContext<'tcx> { . /// Creates a new fulfillment context. 9,883 ( 0.00%) pub fn new() -> FulfillmentContext<'tcx> { 131,447 ( 0.00%) FulfillmentContext { 12,858 ( 0.00%) predicates: ObligationForest::new(), . relationships: FxHashMap::default(), . register_region_obligations: true, . usable_in_snapshot: false, . } 9,883 ( 0.00%) } . . pub fn new_in_snapshot() -> FulfillmentContext<'tcx> { . FulfillmentContext { . predicates: ObligationForest::new(), . relationships: FxHashMap::default(), . register_region_obligations: true, . usable_in_snapshot: true, . } . } . . pub fn new_ignoring_regions() -> FulfillmentContext<'tcx> { 29,792 ( 0.00%) FulfillmentContext { 7,448 ( 0.00%) predicates: ObligationForest::new(), . relationships: FxHashMap::default(), . register_region_obligations: false, . usable_in_snapshot: false, . } . } . . /// Attempts to select obligations using `selcx`. . fn select(&mut self, selcx: &mut SelectionContext<'a, 'tcx>) -> Vec> { 124,530 ( 0.00%) let span = debug_span!("select", obligation_forest_size = ?self.predicates.len()); . let _enter = span.enter(); . . let mut errors = Vec::new(); . . loop { . debug!("select: starting another iteration"); . . // Process pending obligations. . let outcome: Outcome<_, _> = 563,724 ( 0.00%) self.predicates.process_obligations(&mut FulfillProcessor { . selcx, 80,532 ( 0.00%) register_region_obligations: self.register_region_obligations, . }); . debug!("select: outcome={:#?}", outcome); . . // FIXME: if we kept the original cache key, we could mark projection . // obligations as complete for the projection cache here. . . errors.extend(outcome.errors.into_iter().map(to_fulfillment_error)); . . // If nothing new was added, no need to keep looping. 161,064 ( 0.00%) if outcome.stalled { . break; . } . } . . debug!( . "select({} predicates remaining, {} errors) done", . self.predicates.len(), . errors.len() -- line 162 ---------------------------------------- -- line 198 ---------------------------------------- . ); . self.register_predicate_obligations(infcx, obligations); . . debug!(?normalized_ty); . . normalized_ty . } . 330,774 ( 0.00%) fn register_predicate_obligation( . &mut self, . infcx: &InferCtxt<'_, 'tcx>, . obligation: PredicateObligation<'tcx>, . ) { . // this helps to reduce duplicate errors, as well as making . // debug output much nicer to read and so on. 165,387 ( 0.00%) let obligation = infcx.resolve_vars_if_possible(obligation); . . debug!(?obligation, "register_predicate_obligation"); . 330,774 ( 0.00%) assert!(!infcx.is_in_snapshot() || self.usable_in_snapshot); . 165,387 ( 0.00%) super::relationships::update(self, infcx, &obligation); . . self.predicates . .register_obligation(PendingPredicateObligation { obligation, stalled_on: vec![] }); 275,645 ( 0.00%) } . 268,160 ( 0.00%) fn select_all_or_error(&mut self, infcx: &InferCtxt<'_, 'tcx>) -> Vec> { . { 33,520 ( 0.00%) let errors = self.select_where_possible(infcx); 33,520 ( 0.00%) if !errors.is_empty() { 40 ( 0.00%) return errors; . } . } . 167,560 ( 0.00%) self.predicates.to_errors(CodeAmbiguity).into_iter().map(to_fulfillment_error).collect() 234,640 ( 0.00%) } . 622,650 ( 0.00%) fn select_where_possible( . &mut self, . infcx: &InferCtxt<'_, 'tcx>, . ) -> Vec> { . let mut selcx = SelectionContext::new(infcx); . self.select(&mut selcx) 560,385 ( 0.00%) } . 777 ( 0.00%) fn pending_obligations(&self) -> Vec> { . self.predicates.map_pending_obligations(|o| o.obligation.clone()) 1,036 ( 0.00%) } . . fn relationships(&mut self) -> &mut FxHashMap { 209 ( 0.00%) &mut self.relationships 209 ( 0.00%) } . } . . struct FulfillProcessor<'a, 'b, 'tcx> { . selcx: &'a mut SelectionContext<'b, 'tcx>, . register_region_obligations: bool, . } . . fn mk_pending(os: Vec>) -> Vec> { -- line 258 ---------------------------------------- -- line 275 ---------------------------------------- . #[inline(always)] . fn process_obligation( . &mut self, . pending_obligation: &mut Self::Obligation, . ) -> ProcessResult { . // If we were stalled on some unresolved variables, first check whether . // any of them have been resolved; if not, don't bother doing more work . // yet. 19,049,373 ( 0.13%) let change = match pending_obligation.stalled_on.len() { . // Match arms are in order of frequency, which matters because this . // code is so hot. 1 and 0 dominate; 2+ is fairly rare. . 1 => { 9,379,290 ( 0.06%) let infer_var = pending_obligation.stalled_on[0]; 3,126,430 ( 0.02%) self.selcx.infcx().ty_or_const_infer_var_changed(infer_var) . } . 0 => { . // In this case we haven't changed, but wish to make a change. . true . } . _ => { . // This `for` loop was once a call to `all()`, but this lower-level . // form was a perf win. See #64545 for details. 46,695 ( 0.00%) (|| { 90,093 ( 0.00%) for &infer_var in &pending_obligation.stalled_on { 14,068 ( 0.00%) if self.selcx.infcx().ty_or_const_infer_var_changed(infer_var) { . return true; . } . } . false . })() . } . }; . 2,508 ( 0.00%) if !change { . debug!( . "process_predicate: pending obligation {:?} still stalled on {:?}", . self.selcx.infcx().resolve_vars_if_possible(pending_obligation.obligation.clone()), . pending_obligation.stalled_on . ); . return ProcessResult::Unchanged; . } . 277,107 ( 0.00%) self.progress_changed_obligations(pending_obligation) . } . . fn process_backedge<'c, I>( . &mut self, . cycle: I, . _marker: PhantomData<&'c PendingPredicateObligation<'tcx>>, . ) where . I: Clone + Iterator>, -- line 325 ---------------------------------------- -- line 333 ---------------------------------------- . } . } . . impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx> { . // The code calling this method is extremely hot and only rarely . // actually uses this, so move this part of the code . // out of that loop. . #[inline(never)] 923,690 ( 0.01%) fn progress_changed_obligations( . &mut self, . pending_obligation: &mut PendingPredicateObligation<'tcx>, . ) -> ProcessResult, FulfillmentErrorCode<'tcx>> { . pending_obligation.stalled_on.truncate(0); . . let obligation = &mut pending_obligation.obligation; . 277,107 ( 0.00%) if obligation.predicate.has_infer_types_or_consts() { 64,867 ( 0.00%) obligation.predicate = 194,601 ( 0.00%) self.selcx.infcx().resolve_vars_if_possible(obligation.predicate); . } . . debug!(?obligation, ?obligation.cause, "process_obligation"); . . let infcx = self.selcx.infcx(); . 55,004 ( 0.00%) let binder = obligation.predicate.kind(); 646,583 ( 0.00%) match binder.no_bound_vars() { 550 ( 0.00%) None => match binder.skip_binder() { . // Evaluation will discard candidates using the leak check. . // This means we need to pass it the bound version of our . // predicate. . ty::PredicateKind::Trait(trait_ref) => { . let trait_obligation = obligation.with(binder.rebind(trait_ref)); . 100 ( 0.00%) self.process_trait_obligation( . obligation, 300 ( 0.00%) trait_obligation, . &mut pending_obligation.stalled_on, . ) . } . ty::PredicateKind::Projection(data) => { . let project_obligation = obligation.with(binder.rebind(data)); . 100 ( 0.00%) self.process_projection_obligation( . obligation, 300 ( 0.00%) project_obligation, . &mut pending_obligation.stalled_on, . ) . } . ty::PredicateKind::RegionOutlives(_) . | ty::PredicateKind::TypeOutlives(_) . | ty::PredicateKind::WellFormed(_) . | ty::PredicateKind::ObjectSafe(_) . | ty::PredicateKind::ClosureKind(..) -- line 386 ---------------------------------------- -- line 397 ---------------------------------------- . ty::PredicateKind::TypeWellFormedFromEnv(..) => { . bug!("TypeWellFormedFromEnv is only used for Chalk") . } . }, . Some(pred) => match pred { . ty::PredicateKind::Trait(data) => { . let trait_obligation = obligation.with(Binder::dummy(data)); . 251,600 ( 0.00%) self.process_trait_obligation( . obligation, 1,107,040 ( 0.01%) trait_obligation, . &mut pending_obligation.stalled_on, . ) . } . . ty::PredicateKind::RegionOutlives(data) => { 8,118 ( 0.00%) match infcx.region_outlives_predicate(&obligation.cause, Binder::dummy(data)) { 5,412 ( 0.00%) Ok(()) => ProcessResult::Changed(vec![]), . Err(_) => ProcessResult::Error(CodeSelectionError(Unimplemented)), . } . } . . ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(t_a, r_b)) => { 15,478 ( 0.00%) if self.register_region_obligations { 38,695 ( 0.00%) self.selcx.infcx().register_region_obligation_with_cause( . t_a, . r_b, . &obligation.cause, . ); . } . ProcessResult::Changed(vec![]) . } . . ty::PredicateKind::Projection(ref data) => { . let project_obligation = obligation.with(Binder::dummy(*data)); . 29,990 ( 0.00%) self.process_projection_obligation( . obligation, 89,970 ( 0.00%) project_obligation, . &mut pending_obligation.stalled_on, . ) . } . . ty::PredicateKind::ObjectSafe(trait_def_id) => { . if !self.selcx.tcx().is_object_safe(trait_def_id) { . ProcessResult::Error(CodeSelectionError(Unimplemented)) . } else { . ProcessResult::Changed(vec![]) . } . } . . ty::PredicateKind::ClosureKind(_, closure_substs, kind) => { 1,656 ( 0.00%) match self.selcx.infcx().closure_kind(closure_substs) { . Some(closure_kind) => { 3,312 ( 0.00%) if closure_kind.extends(kind) { . ProcessResult::Changed(vec![]) . } else { . ProcessResult::Error(CodeSelectionError(Unimplemented)) . } . } . None => ProcessResult::Unchanged, . } . } . . ty::PredicateKind::WellFormed(arg) => { 177,576 ( 0.00%) match wf::obligations( . self.selcx.infcx(), 50,736 ( 0.00%) obligation.param_env, 50,736 ( 0.00%) obligation.cause.body_id, 76,104 ( 0.00%) obligation.recursion_depth + 1, . arg, . obligation.cause.span, . ) { . None => { 26,236 ( 0.00%) pending_obligation.stalled_on = 45,913 ( 0.00%) vec![TyOrConstInferVar::maybe_from_generic_arg(arg).unwrap()]; 13,118 ( 0.00%) ProcessResult::Unchanged . } 56,427 ( 0.00%) Some(os) => ProcessResult::Changed(mk_pending(os)), . } . } . . ty::PredicateKind::Subtype(subtype) => { 4,024 ( 0.00%) match self.selcx.infcx().subtype_predicate( . &obligation.cause, . obligation.param_env, . Binder::dummy(subtype), . ) { . None => { . // None means that both are unresolved. 2,380 ( 0.00%) pending_obligation.stalled_on = vec![ 476 ( 0.00%) TyOrConstInferVar::maybe_from_ty(subtype.a).unwrap(), 952 ( 0.00%) TyOrConstInferVar::maybe_from_ty(subtype.b).unwrap(), . ]; . ProcessResult::Unchanged . } . Some(Ok(ok)) => ProcessResult::Changed(mk_pending(ok.obligations)), . Some(Err(err)) => { . let expected_found = . ExpectedFound::new(subtype.a_is_expected, subtype.a, subtype.b); . ProcessResult::Error(FulfillmentErrorCode::CodeSubtypeError( -- line 497 ---------------------------------------- -- line 498 ---------------------------------------- . expected_found, . err, . )) . } . } . } . . ty::PredicateKind::Coerce(coerce) => { 3,576 ( 0.00%) match self.selcx.infcx().coerce_predicate( . &obligation.cause, . obligation.param_env, . Binder::dummy(coerce), . ) { . None => { . // None means that both are unresolved. 670 ( 0.00%) pending_obligation.stalled_on = vec![ 134 ( 0.00%) TyOrConstInferVar::maybe_from_ty(coerce.a).unwrap(), 268 ( 0.00%) TyOrConstInferVar::maybe_from_ty(coerce.b).unwrap(), . ]; . ProcessResult::Unchanged . } . Some(Ok(ok)) => ProcessResult::Changed(mk_pending(ok.obligations)), . Some(Err(err)) => { . let expected_found = ExpectedFound::new(false, coerce.a, coerce.b); . ProcessResult::Error(FulfillmentErrorCode::CodeSubtypeError( . expected_found, . err, . )) . } . } . } . . ty::PredicateKind::ConstEvaluatable(uv) => { 234 ( 0.00%) match const_evaluatable::is_const_evaluatable( . self.selcx.infcx(), 468 ( 0.00%) uv, 78 ( 0.00%) obligation.param_env, 39 ( 0.00%) obligation.cause.span, . ) { . Ok(()) => ProcessResult::Changed(vec![]), . Err(NotConstEvaluatable::MentionsInfer) => { . pending_obligation.stalled_on.clear(); . pending_obligation.stalled_on.extend( . uv.substs . .iter() . .filter_map(TyOrConstInferVar::maybe_from_generic_arg), -- line 543 ---------------------------------------- -- line 639 ---------------------------------------- . } . } . } . ty::PredicateKind::TypeWellFormedFromEnv(..) => { . bug!("TypeWellFormedFromEnv is only used for Chalk") . } . }, . } 831,321 ( 0.01%) } . 956,555 ( 0.01%) #[instrument(level = "debug", skip(self, obligation, stalled_on))] . fn process_trait_obligation( . &mut self, . obligation: &PredicateObligation<'tcx>, . trait_obligation: TraitObligation<'tcx>, . stalled_on: &mut Vec>, . ) -> ProcessResult, FulfillmentErrorCode<'tcx>> { 50,345 ( 0.00%) let infcx = self.selcx.infcx(); 151,035 ( 0.00%) if obligation.predicate.is_global() { . // no type variables present, can use evaluation for better caching. . // FIXME: consider caching errors too. 44,784 ( 0.00%) if infcx.predicate_must_hold_considering_regions(obligation) { . debug!( . "selecting trait at depth {} evaluated to holds", . obligation.recursion_depth . ); 44,496 ( 0.00%) return ProcessResult::Changed(vec![]); . } . } . 196,661 ( 0.00%) match self.selcx.select(&trait_obligation) { . Ok(Some(impl_source)) => { . debug!("selecting trait at depth {} yielded Ok(Some)", obligation.recursion_depth); 204,228 ( 0.00%) ProcessResult::Changed(mk_pending(impl_source.nested_obligations())) . } . Ok(None) => { . debug!("selecting trait at depth {} yielded Ok(None)", obligation.recursion_depth); . . // This is a bit subtle: for the most part, the . // only reason we can fail to make progress on . // trait selection is because we don't have enough . // information about the types in the trait. . stalled_on.clear(); . stalled_on.extend(substs_infer_vars( . self.selcx, 16,742 ( 0.00%) trait_obligation.predicate.map_bound(|pred| pred.trait_ref.substs), . )); . . debug!( . "process_predicate: pending obligation {:?} now stalled on {:?}", . infcx.resolve_vars_if_possible(obligation.clone()), . stalled_on . ); . 16,742 ( 0.00%) ProcessResult::Unchanged . } . Err(selection_err) => { . debug!("selecting trait at depth {} yielded Err", obligation.recursion_depth); . 126 ( 0.00%) ProcessResult::Error(CodeSelectionError(selection_err)) . } . } . } . 66,253 ( 0.00%) fn process_projection_obligation( . &mut self, . obligation: &PredicateObligation<'tcx>, . project_obligation: PolyProjectionObligation<'tcx>, . stalled_on: &mut Vec>, . ) -> ProcessResult, FulfillmentErrorCode<'tcx>> { 6,023 ( 0.00%) let tcx = self.selcx.tcx(); . 18,069 ( 0.00%) if obligation.predicate.is_global() { . // no type variables present, can use evaluation for better caching. . // FIXME: consider caching errors too. 2,204 ( 0.00%) if self.selcx.infcx().predicate_must_hold_considering_regions(obligation) { 6,612 ( 0.00%) if let Some(key) = ProjectionCacheKey::from_poly_projection_predicate( . &mut self.selcx, 7,714 ( 0.00%) project_obligation.predicate, . ) { . // If `predicate_must_hold_considering_regions` succeeds, then we've . // evaluated all sub-obligations. We can therefore mark the 'root' . // obligation as complete, and skip evaluating sub-obligations. 6,612 ( 0.00%) self.selcx . .infcx() . .inner . .borrow_mut() . .projection_cache() . .complete(key, EvaluationResult::EvaluatedToOk); . } 2,204 ( 0.00%) return ProcessResult::Changed(vec![]); . } else { . tracing::debug!("Does NOT hold: {:?}", obligation); . } . } . 34,447 ( 0.00%) match project::poly_project_and_unify_type(self.selcx, &project_obligation) { . Ok(Ok(Some(os))) => ProcessResult::Changed(mk_pending(os)), . Ok(Ok(None)) => { . stalled_on.clear(); . stalled_on.extend(substs_infer_vars( . self.selcx, 3,112 ( 0.00%) project_obligation.predicate.map_bound(|pred| pred.projection_ty.substs), . )); 3,112 ( 0.00%) ProcessResult::Unchanged . } . // Let the caller handle the recursion . Ok(Err(project::InProgress)) => ProcessResult::Changed(mk_pending(vec![ . project_obligation.with(project_obligation.predicate.to_predicate(tcx)), . ])), . Err(e) => ProcessResult::Error(CodeProjectionError(e)), . } 48,184 ( 0.00%) } . } . . /// Returns the set of inference variables contained in `substs`. . fn substs_infer_vars<'a, 'tcx>( . selcx: &mut SelectionContext<'a, 'tcx>, . substs: ty::Binder<'tcx, SubstsRef<'tcx>>, . ) -> impl Iterator> { . selcx . .infcx() . .resolve_vars_if_possible(substs) . .skip_binder() // ok because this check doesn't care about regions . .iter() . .filter(|arg| arg.has_infer_types_or_consts()) . .flat_map(|arg| { 107,830 ( 0.00%) let mut walker = arg.walk(); 194,744 ( 0.00%) while let Some(c) = walker.next() { 21,696 ( 0.00%) if !c.has_infer_types_or_consts() { . walker.visited.remove(&c); 6 ( 0.00%) walker.skip_current_subtree(); . } . } . walker.visited.into_iter() . }) . .filter_map(TyOrConstInferVar::maybe_from_generic_arg) . } . . fn to_fulfillment_error<'tcx>( . error: Error, FulfillmentErrorCode<'tcx>>, . ) -> FulfillmentError<'tcx> { . let mut iter = error.backtrace.into_iter(); 9 ( 0.00%) let obligation = iter.next().unwrap().obligation; . // The root obligation is the last item in the backtrace - if there's only . // one item, then it's the same as the main obligation . let root_obligation = iter.next_back().map_or_else(|| obligation.clone(), |e| e.obligation); 270 ( 0.00%) FulfillmentError::new(obligation, error.error, root_obligation) . } 13,595,037 ( 0.09%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_trait_selection/src/traits/select/mod.rs -------------------------------------------------------------------------------- Ir -- line 208 ---------------------------------------- . /// There is no built-in impl. There may be some other . /// candidate (a where-clause or user-defined impl). . None, . /// It is unknown whether there is an impl. . Ambiguous, . } . . impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> { 344,082 ( 0.00%) pub fn new(infcx: &'cx InferCtxt<'cx, 'tcx>) -> SelectionContext<'cx, 'tcx> { 1,874,829 ( 0.01%) SelectionContext { . infcx, 271,677 ( 0.00%) freshener: infcx.freshener_keep_static(), . intercrate: false, . intercrate_ambiguity_causes: None, . allow_negative_impls: false, . query_mode: TraitQueryMode::Standard, . } 286,735 ( 0.00%) } . . pub fn intercrate(infcx: &'cx InferCtxt<'cx, 'tcx>) -> SelectionContext<'cx, 'tcx> { 104,816 ( 0.00%) SelectionContext { . infcx, 13,102 ( 0.00%) freshener: infcx.freshener_keep_static(), . intercrate: true, . intercrate_ambiguity_causes: None, . allow_negative_impls: false, . query_mode: TraitQueryMode::Standard, . } . } . . pub fn with_negative( -- line 238 ---------------------------------------- -- line 245 ---------------------------------------- . freshener: infcx.freshener_keep_static(), . intercrate: false, . intercrate_ambiguity_causes: None, . allow_negative_impls, . query_mode: TraitQueryMode::Standard, . } . } . 20,384 ( 0.00%) pub fn with_query_mode( . infcx: &'cx InferCtxt<'cx, 'tcx>, . query_mode: TraitQueryMode, . ) -> SelectionContext<'cx, 'tcx> { . debug!(?query_mode, "with_query_mode"); 40,768 ( 0.00%) SelectionContext { . infcx, 2,548 ( 0.00%) freshener: infcx.freshener_keep_static(), . intercrate: false, . intercrate_ambiguity_causes: None, . allow_negative_impls: false, . query_mode, . } 15,288 ( 0.00%) } . . /// Enables tracking of intercrate ambiguity causes. These are . /// used in coherence to give improved diagnostics. We don't do . /// this until we detect a coherence error because it can lead to . /// false overflow results (#47139) and because it costs . /// computation time. . pub fn enable_tracking_intercrate_ambiguity_causes(&mut self) { . assert!(self.intercrate); -- line 274 ---------------------------------------- -- line 281 ---------------------------------------- . /// was enabled and disables tracking at the same time. If . /// tracking is not enabled, just returns an empty vector. . pub fn take_intercrate_ambiguity_causes(&mut self) -> Vec { . assert!(self.intercrate); . self.intercrate_ambiguity_causes.take().unwrap_or_default() . } . . pub fn infcx(&self) -> &'cx InferCtxt<'cx, 'tcx> { 16,492,534 ( 0.11%) self.infcx 49,456 ( 0.00%) } . . pub fn tcx(&self) -> TyCtxt<'tcx> { 1,052,951 ( 0.01%) self.infcx.tcx . } . . pub fn is_intercrate(&self) -> bool { 68,355 ( 0.00%) self.intercrate . } . . /////////////////////////////////////////////////////////////////////////// . // Selection . // . // The selection phase tries to identify *how* an obligation will . // be resolved. For example, it will identify which impl or . // parameter bound is to be used. The process can be inconclusive -- line 305 ---------------------------------------- -- line 309 ---------------------------------------- . // 1. If no applicable impl or parameter bound can be found. . // 2. If the output type parameters in the obligation do not match . // those specified by the impl/bound. For example, if the obligation . // is `Vec: Iterable`, but the impl specifies . // `impl Iterable for Vec`, than an error would result. . . /// Attempts to satisfy the obligation. If successful, this will affect the surrounding . /// type environment by performing unification. 325,766 ( 0.00%) #[instrument(level = "debug", skip(self))] 418,842 ( 0.00%) pub fn select( . &mut self, . obligation: &TraitObligation<'tcx>, . ) -> SelectionResult<'tcx, Selection<'tcx>> { 348,640 ( 0.00%) let candidate = match self.select_from_obligation(obligation) { . Err(SelectionError::Overflow) => { . // In standard mode, overflow must have been caught and reported . // earlier. . assert!(self.query_mode == TraitQueryMode::Canonical); . return Err(SelectionError::Overflow); . } . Err(SelectionError::Ambiguous(_)) => { . return Ok(None); . } . Err(e) => { 110,782 ( 0.00%) return Err(e); . } . Ok(None) => { 49,404 ( 0.00%) return Ok(None); . } 111,798 ( 0.00%) Ok(Some(candidate)) => candidate, . }; . 186,414 ( 0.00%) match self.confirm_candidate(obligation, candidate) { . Err(SelectionError::Overflow) => { . assert!(self.query_mode == TraitQueryMode::Canonical); . Err(SelectionError::Overflow) . } 546 ( 0.00%) Err(e) => Err(e), . Ok(candidate) => { . debug!(?candidate, "confirmed"); 223,092 ( 0.00%) Ok(Some(candidate)) . } . } . } . 465,380 ( 0.00%) crate fn select_from_obligation( . &mut self, . obligation: &TraitObligation<'tcx>, . ) -> SelectionResult<'tcx, SelectionCandidate<'tcx>> { . debug_assert!(!obligation.predicate.has_escaping_bound_vars()); . . let pec = &ProvisionalEvaluationCache::default(); . let stack = self.push_stack(TraitObligationStackList::empty(pec), obligation); . 93,076 ( 0.00%) self.candidate_from_obligation(&stack) 418,842 ( 0.00%) } . . /////////////////////////////////////////////////////////////////////////// . // EVALUATION . // . // Tests whether an obligation can be selected or whether an impl . // can be applied to particular types. It skips the "confirmation" . // step and hence completely ignores output type parameters. . // -- line 372 ---------------------------------------- -- line 374 ---------------------------------------- . // we can be sure it does not. . . /// Evaluates whether the obligation `obligation` can be satisfied (by any means). . pub fn predicate_may_hold_fatal(&mut self, obligation: &PredicateObligation<'tcx>) -> bool { . debug!(?obligation, "predicate_may_hold_fatal"); . . // This fatal query is a stopgap that should only be used in standard mode, . // where we do not expect overflow to be propagated. 134 ( 0.00%) assert!(self.query_mode == TraitQueryMode::Standard); . 670 ( 0.00%) self.evaluate_root_obligation(obligation) . .expect("Overflow should be caught earlier in standard query mode") . .may_apply() . } . . /// Evaluates whether the obligation `obligation` can be satisfied . /// and returns an `EvaluationResult`. This is meant for the . /// *initial* call. 5,096 ( 0.00%) pub fn evaluate_root_obligation( . &mut self, . obligation: &PredicateObligation<'tcx>, . ) -> Result { . self.evaluation_probe(|this| { 8,046 ( 0.00%) this.evaluate_predicate_recursively( . TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()), . obligation.clone(), . ) . }) 5,096 ( 0.00%) } . . fn evaluation_probe( . &mut self, . op: impl FnOnce(&mut Self) -> Result, . ) -> Result { 56,478 ( 0.00%) self.infcx.probe(|snapshot| -> Result { 5,364 ( 0.00%) let result = op(self)?; . 52,752 ( 0.00%) match self.infcx.leak_check(true, snapshot) { . Ok(()) => {} . Err(_) => return Ok(EvaluatedToErr), . } . 37,680 ( 0.00%) match self.infcx.region_constraints_added_in_snapshot(snapshot) { . None => Ok(result), . Some(_) => Ok(result.max(EvaluatedToOkModuloRegions)), . } . }) . } . . /// Evaluates the predicates in `predicates` recursively. Note that . /// this applies projections in the predicates, and therefore . /// is run within an inference probe. 92,700 ( 0.00%) #[instrument(skip(self, stack), level = "debug")] . fn evaluate_predicates_recursively<'o, I>( . &mut self, . stack: TraitObligationStackList<'o, 'tcx>, . predicates: I, . ) -> Result . where . I: IntoIterator> + std::fmt::Debug, . { . let mut result = EvaluatedToOk; 52,412 ( 0.00%) for obligation in predicates { 12,076 ( 0.00%) let eval = self.evaluate_predicate_recursively(stack, obligation.clone())?; 6,038 ( 0.00%) if let EvaluatedToErr = eval { . // fast-path - EvaluatedToErr is the top of the lattice, . // so we don't need to look on the other predicates. . return Ok(EvaluatedToErr); . } else { . result = cmp::max(result, eval); . } . } . Ok(result) . } . 57,010 ( 0.00%) #[instrument( . level = "debug", . skip(self, previous_stack), . fields(previous_stack = ?previous_stack.head()) 51,309 ( 0.00%) )] . fn evaluate_predicate_recursively<'o>( . &mut self, . previous_stack: TraitObligationStackList<'o, 'tcx>, . obligation: PredicateObligation<'tcx>, . ) -> Result { . // `previous_stack` stores a `TraitObligation`, while `obligation` is . // a `PredicateObligation`. These are distinct types, so we can't . // use any `Option` combinator method that would force them to be . // the same. 11,402 ( 0.00%) match previous_stack.head() { 6,004 ( 0.00%) Some(h) => self.check_recursion_limit(&obligation, h.obligation)?, 2,699 ( 0.00%) None => self.check_recursion_limit(&obligation, &obligation)?, . } . 34,206 ( 0.00%) let result = ensure_sufficient_stack(|| { 5,701 ( 0.00%) let bound_predicate = obligation.predicate.kind(); 57,010 ( 0.00%) match bound_predicate.skip_binder() { . ty::PredicateKind::Trait(t) => { . let t = bound_predicate.rebind(t); . debug_assert!(!t.has_escaping_bound_vars()); . let obligation = obligation.with(t); 79,050 ( 0.00%) self.evaluate_trait_predicate_recursively(previous_stack, obligation) . } . . ty::PredicateKind::Subtype(p) => { . let p = bound_predicate.rebind(p); . // Does this code ever run? 15 ( 0.00%) match self.infcx.subtype_predicate(&obligation.cause, obligation.param_env, p) { . Some(Ok(InferOk { mut obligations, .. })) => { . self.add_depth(obligations.iter_mut(), obligation.recursion_depth); . self.evaluate_predicates_recursively( . previous_stack, . obligations.into_iter(), . ) . } . Some(Err(_)) => Ok(EvaluatedToErr), -- line 489 ---------------------------------------- -- line 545 ---------------------------------------- . } else { . Ok(EvaluatedToErr) . } . } . . ty::PredicateKind::Projection(data) => { . let data = bound_predicate.rebind(data); . let project_obligation = obligation.with(data); 582 ( 0.00%) match project::poly_project_and_unify_type(self, &project_obligation) { 480 ( 0.00%) Ok(Ok(Some(mut subobligations))) => { . 'compute_res: { . // If we've previously marked this projection as 'complete', thne . // use the final cached result (either `EvaluatedToOk` or . // `EvaluatedToOkModuloRegions`), and skip re-evaluating the . // sub-obligations. 384 ( 0.00%) if let Some(key) = 864 ( 0.00%) ProjectionCacheKey::from_poly_projection_predicate(self, data) . { 768 ( 0.00%) if let Some(cached_res) = self . .infcx . .inner . .borrow_mut() . .projection_cache() . .is_complete(key) . { . break 'compute_res Ok(cached_res); . } . } . 192 ( 0.00%) self.add_depth( . subobligations.iter_mut(), 192 ( 0.00%) obligation.recursion_depth, . ); 192 ( 0.00%) let res = self.evaluate_predicates_recursively( 288 ( 0.00%) previous_stack, 480 ( 0.00%) subobligations, . ); 384 ( 0.00%) if let Ok(res) = res { 192 ( 0.00%) if res == EvaluatedToOk || res == EvaluatedToOkModuloRegions { 220 ( 0.00%) if let Some(key) = 55 ( 0.00%) ProjectionCacheKey::from_poly_projection_predicate( 385 ( 0.00%) self, data, . ) . { . // If the result is something that we can cache, then mark this . // entry as 'complete'. This will allow us to skip evaluating the . // suboligations at all the next time we evaluate the projection . // predicate. 385 ( 0.00%) self.infcx . .inner . .borrow_mut() . .projection_cache() . .complete(key, res); . } . } . } . res -- line 601 ---------------------------------------- -- line 603 ---------------------------------------- . } . Ok(Ok(None)) => Ok(EvaluatedToAmbig), . Ok(Err(project::InProgress)) => Ok(EvaluatedToRecur), . Err(_) => Ok(EvaluatedToErr), . } . } . . ty::PredicateKind::ClosureKind(_, closure_substs, kind) => { 1,665 ( 0.00%) match self.infcx.closure_kind(closure_substs) { . Some(closure_kind) => { 999 ( 0.00%) if closure_kind.extends(kind) { . Ok(EvaluatedToOk) . } else { . Ok(EvaluatedToErr) . } . } . None => Ok(EvaluatedToAmbig), . } . } -- line 621 ---------------------------------------- -- line 693 ---------------------------------------- . } . } . } . } . ty::PredicateKind::TypeWellFormedFromEnv(..) => { . bug!("TypeWellFormedFromEnv is only used for chalk") . } . } 5,701 ( 0.00%) }); . . debug!("finished: {:?} from {:?}", result, obligation); . . result . } . 110,670 ( 0.00%) #[instrument(skip(self, previous_stack), level = "debug")] . fn evaluate_trait_predicate_recursively<'o>( . &mut self, . previous_stack: TraitObligationStackList<'o, 'tcx>, . mut obligation: TraitObligation<'tcx>, . ) -> Result { 10,540 ( 0.00%) if !self.intercrate . && obligation.is_global() . && obligation.param_env.caller_bounds().iter().all(|bound| bound.needs_subst()) . { . // If a param env has no global bounds, global obligations do not . // depend on its particular value in order to work, so we can clear . // out the param env and get better caching. . debug!("in global"); 5,804 ( 0.00%) obligation.param_env = obligation.param_env.without_caller_bounds(); . } . . let stack = self.push_stack(previous_stack, &obligation); . let mut fresh_trait_pred = stack.fresh_trait_pred; 10,540 ( 0.00%) let mut param_env = obligation.param_env; . . fresh_trait_pred = fresh_trait_pred.map_bound(|mut pred| { 5,270 ( 0.00%) pred.remap_constness(self.tcx(), &mut param_env); 63,240 ( 0.00%) pred . }); . . debug!(?fresh_trait_pred); . 6,230 ( 0.00%) if let Some(result) = self.check_evaluation_cache(param_env, fresh_trait_pred) { . debug!(?result, "CACHE HIT"); . return Ok(result); . } . . if let Some(result) = stack.cache().get_provisional(fresh_trait_pred) { . debug!(?result, "PROVISIONAL CACHE HIT"); . stack.update_reached_depth(result.reached_depth); . return Ok(result.result); -- line 744 ---------------------------------------- -- line 748 ---------------------------------------- . // stack. If so, we don't want to insert the result into the . // main cache (it is cycle dependent) nor the provisional . // cache (which is meant for things that have completed but . // for a "backedge" -- this result *is* the backedge). . if let Some(cycle_result) = self.check_evaluation_cycle(&stack) { . return Ok(cycle_result); . } . 30,177 ( 0.00%) let (result, dep_node) = self.in_task(|this| this.evaluate_stack(&stack)); 3,353 ( 0.00%) let result = result?; . 16,765 ( 0.00%) if !result.must_apply_modulo_regions() { . stack.cache().on_failure(stack.dfn); . } . 3,353 ( 0.00%) let reached_depth = stack.reached_depth.get(); 6,706 ( 0.00%) if reached_depth >= stack.depth { . debug!(?result, "CACHE MISS"); 63,707 ( 0.00%) self.insert_evaluation_cache(param_env, fresh_trait_pred, dep_node, result); . . stack.cache().on_completion( 6,706 ( 0.00%) stack.dfn, . |fresh_trait_pred, provisional_result, provisional_dep_node| { . // Create a new `DepNode` that has dependencies on: . // * The `DepNode` for the original evaluation that resulted in a provisional cache . // entry being crated . // * The `DepNode` for the *current* evaluation, which resulted in us completing . // provisional caches entries and inserting them into the evaluation cache . // . // This ensures that when a query reads this entry from the evaluation cache, -- line 777 ---------------------------------------- -- line 835 ---------------------------------------- . /// `self.freshener`, we can be sure that (a) this will not . /// affect the inferencer state and (b) that if we see two . /// fresh regions with the same index, they refer to the same . /// unbound type variable. . fn check_evaluation_cycle( . &mut self, . stack: &TraitObligationStack<'_, 'tcx>, . ) -> Option { 32 ( 0.00%) if let Some(cycle_depth) = stack . .iter() . .skip(1) // Skip top-most frame. . .find(|prev| { 2,118 ( 0.00%) stack.obligation.param_env == prev.obligation.param_env . && stack.fresh_trait_pred == prev.fresh_trait_pred . }) . .map(|stack| stack.depth) . { . debug!("evaluate_stack --> recursive at depth {}", cycle_depth); . . // If we have a stack like `A B C D E A`, where the top of . // the stack is the final `A`, then this will iterate over . // `A, E, D, C, B` -- i.e., all the participants apart . // from the cycle head. We mark them as participating in a . // cycle. This suppresses caching for those nodes. See . // `in_cycle` field for more details. 32 ( 0.00%) stack.update_reached_depth(cycle_depth); . . // Subtle: when checking for a coinductive cycle, we do . // not compare using the "freshened trait refs" (which . // have erased regions) but rather the fully explicit . // trait refs. This is important because it's only a cycle . // if the regions match exactly. 25 ( 0.00%) let cycle = stack.iter().skip(1).take_while(|s| s.depth >= cycle_depth); 16 ( 0.00%) let tcx = self.tcx(); 112 ( 0.00%) let cycle = cycle.map(|stack| stack.obligation.predicate.to_predicate(tcx)); 176 ( 0.00%) if self.coinductive_match(cycle) { . debug!("evaluate_stack --> recursive, coinductive"); . Some(EvaluatedToOk) . } else { . debug!("evaluate_stack --> recursive, inductive"); . Some(EvaluatedToRecur) . } . } else { . None . } . } . 30,177 ( 0.00%) fn evaluate_stack<'o>( . &mut self, . stack: &TraitObligationStack<'o, 'tcx>, . ) -> Result { . // In intercrate mode, whenever any of the generics are unbound, . // there can always be an impl. Even if there are no impls in . // this crate, perhaps the type would be unified with . // something from another crate that does provide an impl. . // -- line 890 ---------------------------------------- -- line 903 ---------------------------------------- . // imagine, this is just where we started. To avoid that, we . // check for unbound variables and return an ambiguous (hence possible) . // match if we've seen this trait before. . // . // This suffices to allow chains like `FnMut` implemented in . // terms of `Fn` etc, but we could probably make this more . // precise still. . let unbound_input_types = 3,353 ( 0.00%) stack.fresh_trait_pred.skip_binder().trait_ref.substs.types().any(|ty| ty.is_fresh()); . 10,059 ( 0.00%) if stack.obligation.polarity() != ty::ImplPolarity::Negative { . // This check was an imperfect workaround for a bug in the old . // intercrate mode; it should be removed when that goes away. 16,765 ( 0.00%) if unbound_input_types && self.intercrate { . debug!("evaluate_stack --> unbound argument, intercrate --> ambiguous",); . // Heuristics: show the diagnostics when there are no candidates in crate. . if self.intercrate_ambiguity_causes.is_some() { . debug!("evaluate_stack: intercrate_ambiguity_causes is some"); . if let Ok(candidate_set) = self.assemble_candidates(stack) { . if !candidate_set.ambiguous && candidate_set.vec.is_empty() { . let trait_ref = stack.obligation.predicate.skip_binder().trait_ref; . let self_ty = trait_ref.self_ty(); -- line 924 ---------------------------------------- -- line 937 ---------------------------------------- . self.intercrate_ambiguity_causes.as_mut().unwrap().push(cause); . } . } . } . return Ok(EvaluatedToAmbig); . } . } . 6,706 ( 0.00%) if unbound_input_types . && stack.iter().skip(1).any(|prev| { 765 ( 0.00%) stack.obligation.param_env == prev.obligation.param_env . && self.match_fresh_trait_refs( 1,020 ( 0.00%) stack.fresh_trait_pred, 1,020 ( 0.00%) prev.fresh_trait_pred, . prev.obligation.param_env, . ) . }) . { . debug!("evaluate_stack --> unbound argument, recursive --> giving up",); . return Ok(EvaluatedToUnknown); . } . 30,352 ( 0.00%) match self.candidate_from_obligation(stack) { 15,618 ( 0.00%) Ok(Some(c)) => self.evaluate_candidate(stack, &c), . Err(SelectionError::Ambiguous(_)) => Ok(EvaluatedToAmbig), . Ok(None) => Ok(EvaluatedToAmbig), . Err(Overflow) => Err(OverflowError::Canonical), . Err(ErrorReporting) => Err(OverflowError::ErrorReporting), . Err(..) => Ok(EvaluatedToErr), . } 33,530 ( 0.00%) } . . /// For defaulted traits, we use a co-inductive strategy to solve, so . /// that recursion is ok. This routine returns `true` if the top of the . /// stack (`cycle[0]`): . /// . /// - is a defaulted trait, . /// - it also appears in the backtrace at some position `X`, . /// - all the predicates at positions `X..` between `X` and the top are -- line 975 ---------------------------------------- -- line 977 ---------------------------------------- . pub fn coinductive_match(&mut self, mut cycle: I) -> bool . where . I: Iterator>, . { . cycle.all(|predicate| self.coinductive_predicate(predicate)) . } . . fn coinductive_predicate(&self, predicate: ty::Predicate<'tcx>) -> bool { 32 ( 0.00%) let result = match predicate.kind().skip_binder() { 144 ( 0.00%) ty::PredicateKind::Trait(ref data) => self.tcx().trait_is_auto(data.def_id()), . _ => false, . }; . debug!(?predicate, ?result, "coinductive_predicate"); . result . } . . /// Further evaluates `candidate` to decide whether all type parameters match and whether nested . /// obligations are met. Returns whether `candidate` remains viable after this further -- line 994 ---------------------------------------- -- line 998 ---------------------------------------- . skip(self, stack), . fields(depth = stack.obligation.recursion_depth) . )] . fn evaluate_candidate<'o>( . &mut self, . stack: &TraitObligationStack<'o, 'tcx>, . candidate: &SelectionCandidate<'tcx>, . ) -> Result { 8,788 ( 0.00%) let mut result = self.evaluation_probe(|this| { . let candidate = (*candidate).clone(); 70,373 ( 0.00%) match this.confirm_candidate(stack.obligation, candidate) { . Ok(selection) => { . debug!(?selection); 17,576 ( 0.00%) this.evaluate_predicates_recursively( . stack.list(), 57,122 ( 0.00%) selection.nested_obligations().into_iter(), . ) . } . Err(..) => Ok(EvaluatedToErr), . } . })?; . . // If we erased any lifetimes, then we want to use . // `EvaluatedToOkModuloRegions` instead of `EvaluatedToOk` -- line 1021 ---------------------------------------- -- line 1037 ---------------------------------------- . &self, . param_env: ty::ParamEnv<'tcx>, . trait_pred: ty::PolyTraitPredicate<'tcx>, . ) -> Option { . // Neither the global nor local cache is aware of intercrate . // mode, so don't do any caching. In particular, we might . // re-use the same `InferCtxt` with both an intercrate . // and non-intercrate `SelectionContext` 10,540 ( 0.00%) if self.intercrate { . return None; . } . . let tcx = self.tcx(); . if self.can_use_global_caches(param_env) { 35,077 ( 0.00%) if let Some(res) = tcx.evaluation_cache.get(¶m_env.and(trait_pred), tcx) { . return Some(res); . } . } 12,460 ( 0.00%) self.infcx.evaluation_cache.get(¶m_env.and(trait_pred), tcx) . } . 40,236 ( 0.00%) fn insert_evaluation_cache( . &mut self, . param_env: ty::ParamEnv<'tcx>, . trait_pred: ty::PolyTraitPredicate<'tcx>, . dep_node: DepNodeIndex, . result: EvaluationResult, . ) { . // Avoid caching results that depend on more than just the trait-ref . // - the stack can create recursion. 13,412 ( 0.00%) if result.is_stack_dependent() { . return; . } . . // Neither the global nor local cache is aware of intercrate . // mode, so don't do any caching. In particular, we might . // re-use the same `InferCtxt` with both an intercrate . // and non-intercrate `SelectionContext` 6,482 ( 0.00%) if self.intercrate { . return; . } . . if self.can_use_global_caches(param_env) { . if !trait_pred.needs_infer() { . debug!(?trait_pred, ?result, "insert_evaluation_cache global"); . // This may overwrite the cache with the same value . // FIXME: Due to #50507 this overwrites the different values . // This should be changed to use HashMapExt::insert_same . // when that is fixed 2,982 ( 0.00%) self.tcx().evaluation_cache.insert(param_env.and(trait_pred), dep_node, result); . return; . } . } . . debug!(?trait_pred, ?result, "insert_evaluation_cache"); 20 ( 0.00%) self.infcx.evaluation_cache.insert(param_env.and(trait_pred), dep_node, result); 26,824 ( 0.00%) } . . /// For various reasons, it's possible for a subobligation . /// to have a *lower* recursion_depth than the obligation used to create it. . /// Projection sub-obligations may be returned from the projection cache, . /// which results in obligations with an 'old' `recursion_depth`. . /// Additionally, methods like `InferCtxt.subtype_predicate` produce . /// subobligations without taking in a 'parent' depth, causing the . /// generated subobligations to have a `recursion_depth` of `0`. . /// . /// To ensure that obligation_depth never decreases, we force all subobligations . /// to have at least the depth of the original obligation. 96 ( 0.00%) fn add_depth>>( . &self, . it: I, . min_depth: usize, . ) { 216 ( 0.00%) it.for_each(|o| o.recursion_depth = cmp::max(min_depth, o.recursion_depth) + 1); 192 ( 0.00%) } . . fn check_recursion_depth>( . &self, . depth: usize, . error_obligation: &Obligation<'tcx, T>, . ) -> Result<(), OverflowError> { 221,920 ( 0.00%) if !self.infcx.tcx.recursion_limit().value_within_limit(depth) { . match self.query_mode { . TraitQueryMode::Standard => { . if self.infcx.is_tainted_by_errors() { . return Err(OverflowError::ErrorReporting); . } . self.infcx.report_overflow_error(error_obligation, true); . } . TraitQueryMode::Canonical => { -- line 1126 ---------------------------------------- -- line 1143 ---------------------------------------- . ) -> Result<(), OverflowError> { . self.check_recursion_depth(obligation.recursion_depth, error_obligation) . } . . fn in_task(&mut self, op: OP) -> (R, DepNodeIndex) . where . OP: FnOnce(&mut Self) -> R, . { 69,030 ( 0.00%) let (result, dep_node) = 58,684 ( 0.00%) self.tcx().dep_graph.with_anon_task(self.tcx(), DepKind::TraitSelect, || op(self)); . self.tcx().dep_graph.read_index(dep_node); 63,720 ( 0.00%) (result, dep_node) . } . . /// filter_impls filters constant trait obligations and candidates that have a positive impl . /// for a negative goal and a negative impl for a positive goal . #[instrument(level = "debug", skip(self))] . fn filter_impls( . &mut self, . candidates: Vec>, . obligation: &TraitObligation<'tcx>, . ) -> Vec> { . let tcx = self.tcx(); . let mut result = Vec::with_capacity(candidates.len()); . 91,248 ( 0.00%) for candidate in candidates { . // Respect const trait obligations 17,859 ( 0.00%) if obligation.is_const() { 21 ( 0.00%) match candidate { . // const impl . ImplCandidate(def_id) . if tcx.impl_constness(def_id) == hir::Constness::Const => {} . // const param . ParamCandidate(trait_pred) . if trait_pred.skip_binder().constness . == ty::BoundConstness::ConstIfConst => {} . // auto trait impl -- line 1179 ---------------------------------------- -- line 1186 ---------------------------------------- . ConstDropCandidate(_) => {} . _ => { . // reject all other types of candidates . continue; . } . } . } . 11,892 ( 0.00%) if let ImplCandidate(def_id) = candidate { 8,130 ( 0.00%) if ty::ImplPolarity::Reservation == tcx.impl_polarity(def_id) 4,065 ( 0.00%) || obligation.polarity() == tcx.impl_polarity(def_id) . || self.allow_negative_impls . { . result.push(candidate); . } . } else { . result.push(candidate); . } . } . 20,612 ( 0.00%) result . } . . /// filter_reservation_impls filter reservation impl for any goal as ambiguous 73,168 ( 0.00%) #[instrument(level = "debug", skip(self))] . fn filter_reservation_impls( . &mut self, . candidate: SelectionCandidate<'tcx>, . obligation: &TraitObligation<'tcx>, . ) -> SelectionResult<'tcx, SelectionCandidate<'tcx>> { . let tcx = self.tcx(); . // Treat reservation impls as ambiguity. 13,440 ( 0.00%) if let ImplCandidate(def_id) = candidate { 4,832 ( 0.00%) if let ty::ImplPolarity::Reservation = tcx.impl_polarity(def_id) { . if let Some(intercrate_ambiguity_clauses) = &mut self.intercrate_ambiguity_causes { . let attrs = tcx.get_attrs(def_id); . let attr = tcx.sess.find_by_name(&attrs, sym::rustc_reservation_impl); . let value = attr.and_then(|a| a.value_str()); . if let Some(value) = value { . debug!( . "filter_reservation_impls: \ . reservation impl ambiguity on {:?}", -- line 1227 ---------------------------------------- -- line 1232 ---------------------------------------- . message: value.to_string(), . }, . ); . } . } . return Ok(None); . } . } 25,824 ( 0.00%) Ok(Some(candidate)) . } . . fn is_knowable<'o>(&mut self, stack: &TraitObligationStack<'o, 'tcx>) -> Option { . debug!("is_knowable(intercrate={:?})", self.intercrate); . 16,734 ( 0.00%) if !self.intercrate || stack.obligation.polarity() == ty::ImplPolarity::Negative { . return None; . } . . let obligation = &stack.obligation; 804 ( 0.00%) let predicate = self.infcx().resolve_vars_if_possible(obligation.predicate); . . // Okay to skip binder because of the nature of the . // trait-ref-is-knowable check, which does not care about . // bound regions. . let trait_ref = predicate.skip_binder().trait_ref; . 804 ( 0.00%) coherence::trait_ref_is_knowable(self.tcx(), trait_ref) . } . . /// Returns `true` if the global caches can be used. . fn can_use_global_caches(&self, param_env: ty::ParamEnv<'tcx>) -> bool { . // If there are any inference variables in the `ParamEnv`, then we . // always use a cache local to this particular scope. Otherwise, we . // switch to a global cache. . if param_env.needs_infer() { -- line 1266 ---------------------------------------- -- line 1286 ---------------------------------------- . &mut self, . mut param_env: ty::ParamEnv<'tcx>, . cache_fresh_trait_pred: ty::PolyTraitPredicate<'tcx>, . ) -> Option>> { . // Neither the global nor local cache is aware of intercrate . // mode, so don't do any caching. In particular, we might . // re-use the same `InferCtxt` with both an intercrate . // and non-intercrate `SelectionContext` 99,558 ( 0.00%) if self.intercrate { 268 ( 0.00%) return None; . } . let tcx = self.tcx(); . let mut pred = cache_fresh_trait_pred.skip_binder(); 99,022 ( 0.00%) pred.remap_constness(tcx, &mut param_env); . 49,511 ( 0.00%) if self.can_use_global_caches(param_env) { 495,050 ( 0.00%) if let Some(res) = tcx.selection_cache.get(¶m_env.and(pred), tcx) { 578,097 ( 0.00%) return Some(res); . } . } 55,456 ( 0.00%) self.infcx.selection_cache.get(¶m_env.and(pred), tcx) . } . . /// Determines whether can we safely cache the result . /// of selecting an obligation. This is almost always `true`, . /// except when dealing with certain `ParamCandidate`s. . /// . /// Ordinarily, a `ParamCandidate` will contain no inference variables, . /// since it was usually produced directly from a `DefId`. However, -- line 1314 ---------------------------------------- -- line 1325 ---------------------------------------- . fn can_cache_candidate( . &self, . result: &SelectionResult<'tcx, SelectionCandidate<'tcx>>, . ) -> bool { . // Neither the global nor local cache is aware of intercrate . // mode, so don't do any caching. In particular, we might . // re-use the same `InferCtxt` with both an intercrate . // and non-intercrate `SelectionContext` 10,620 ( 0.00%) if self.intercrate { . return false; . } 15,126 ( 0.00%) match result { . Ok(Some(SelectionCandidate::ParamCandidate(trait_ref))) => !trait_ref.needs_infer(), . _ => true, . } . } . . fn insert_candidate_cache( . &mut self, . mut param_env: ty::ParamEnv<'tcx>, . cache_fresh_trait_pred: ty::PolyTraitPredicate<'tcx>, . dep_node: DepNodeIndex, . candidate: SelectionResult<'tcx, SelectionCandidate<'tcx>>, . ) { . let tcx = self.tcx(); . let mut pred = cache_fresh_trait_pred.skip_binder(); . 10,620 ( 0.00%) pred.remap_constness(tcx, &mut param_env); . . if !self.can_cache_candidate(&candidate) { . debug!(?pred, ?candidate, "insert_candidate_cache - candidate is not cacheable"); . return; . } . 5,042 ( 0.00%) if self.can_use_global_caches(param_env) { 11,624 ( 0.00%) if let Err(Overflow) = candidate { . // Don't cache overflow globally; we only produce this in certain modes. . } else if !pred.needs_infer() { 20,144 ( 0.00%) if !candidate.needs_infer() { . debug!(?pred, ?candidate, "insert_candidate_cache global"); . // This may overwrite the cache with the same value. 135,972 ( 0.00%) tcx.selection_cache.insert(param_env.and(pred), dep_node, candidate); . return; . } . } . } . . debug!(?pred, ?candidate, "insert_candidate_cache local"); 138 ( 0.00%) self.infcx.selection_cache.insert(param_env.and(pred), dep_node, candidate); . } . . /// Matches a predicate against the bounds of its self type. . /// . /// Given an obligation like `::Bar: Baz` where the self type is . /// a projection, look at the bounds of `T::Bar`, see if we can find a . /// `Baz` bound. We return indexes into the list returned by . /// `tcx.item_bounds` for any applicable bounds. 36 ( 0.00%) fn match_projection_obligation_against_definition_bounds( . &mut self, . obligation: &TraitObligation<'tcx>, . ) -> smallvec::SmallVec<[usize; 2]> { 52 ( 0.00%) let poly_trait_predicate = self.infcx().resolve_vars_if_possible(obligation.predicate); . let placeholder_trait_predicate = 68 ( 0.00%) self.infcx().replace_bound_vars_with_placeholders(poly_trait_predicate); . debug!( . ?placeholder_trait_predicate, . "match_projection_obligation_against_definition_bounds" . ); . 4 ( 0.00%) let tcx = self.infcx.tcx; 24 ( 0.00%) let (def_id, substs) = match *placeholder_trait_predicate.trait_ref.self_ty().kind() { 12 ( 0.00%) ty::Projection(ref data) => (data.item_def_id, data.substs), . ty::Opaque(def_id, substs) => (def_id, substs), . _ => { . span_bug!( . obligation.cause.span, . "match_projection_obligation_against_definition_bounds() called \ . but self-ty is not a projection: {:?}", . placeholder_trait_predicate.trait_ref.self_ty() . ); -- line 1404 ---------------------------------------- -- line 1411 ---------------------------------------- . // unnecessary ambiguity. . let mut distinct_normalized_bounds = FxHashSet::default(); . . let matching_bounds = bounds . .iter() . .enumerate() . .filter_map(|(idx, bound)| { . let bound_predicate = bound.kind(); 39 ( 0.00%) if let ty::PredicateKind::Trait(pred) = bound_predicate.skip_binder() { . let bound = bound_predicate.rebind(pred.trait_ref); 195 ( 0.00%) if self.infcx.probe(|_| { 78 ( 0.00%) match self.match_normalize_trait_ref( . obligation, 52 ( 0.00%) bound, 52 ( 0.00%) placeholder_trait_predicate.trait_ref, . ) { . Ok(None) => true, . Ok(Some(normalized_trait)) . if distinct_normalized_bounds.insert(normalized_trait) => . { . true . } . _ => false, -- line 1433 ---------------------------------------- -- line 1437 ---------------------------------------- . } . } . None . }) . .collect(); . . debug!(?matching_bounds, "match_projection_obligation_against_definition_bounds"); . matching_bounds 36 ( 0.00%) } . . /// Equates the trait in `obligation` with trait bound. If the two traits . /// can be equated and the normalized trait bound doesn't contain inference . /// variables or placeholders, the normalized bound is returned. 169 ( 0.00%) fn match_normalize_trait_ref( . &mut self, . obligation: &TraitObligation<'tcx>, . trait_bound: ty::PolyTraitRef<'tcx>, . placeholder_trait_ref: ty::TraitRef<'tcx>, . ) -> Result>, ()> { . debug_assert!(!placeholder_trait_ref.has_escaping_bound_vars()); 41 ( 0.00%) if placeholder_trait_ref.def_id != trait_bound.def_id() { . // Avoid unnecessary normalization 24 ( 0.00%) return Err(()); . } . 12 ( 0.00%) let Normalized { value: trait_bound, obligations: _ } = ensure_sufficient_stack(|| { . project::normalize_with_depth( . self, 1 ( 0.00%) obligation.param_env, . obligation.cause.clone(), 3 ( 0.00%) obligation.recursion_depth + 1, 4 ( 0.00%) trait_bound, . ) . }); 3 ( 0.00%) self.infcx 2 ( 0.00%) .at(&obligation.cause, obligation.param_env) . .sup(ty::Binder::dummy(placeholder_trait_ref), trait_bound) . .map(|InferOk { obligations: _, value: () }| { . // This method is called within a probe, so we can't have . // inference variables and placeholders escape. . if !trait_bound.needs_infer() && !trait_bound.has_placeholders() { 5 ( 0.00%) Some(trait_bound) . } else { . None . } . }) . .map_err(|_| ()) 117 ( 0.00%) } . . fn evaluate_where_clause<'o>( . &mut self, . stack: &TraitObligationStack<'o, 'tcx>, . where_clause_trait_ref: ty::PolyTraitRef<'tcx>, . ) -> Result { . self.evaluation_probe(|this| { 5,060 ( 0.00%) match this.match_where_clause_trait_ref(stack.obligation, where_clause_trait_ref) { 1,160 ( 0.00%) Ok(obligations) => this.evaluate_predicates_recursively(stack.list(), obligations), . Err(()) => Ok(EvaluatedToErr), . } . }) . } . 2,889 ( 0.00%) pub(super) fn match_projection_projections( . &mut self, . obligation: &ProjectionTyObligation<'tcx>, . env_predicate: PolyProjectionPredicate<'tcx>, . potentially_unnormalized_candidates: bool, . ) -> bool { . let mut nested_obligations = Vec::new(); 1,605 ( 0.00%) let (infer_predicate, _) = self.infcx.replace_bound_vars_with_fresh_vars( 963 ( 0.00%) obligation.cause.span, . LateBoundRegionConversionTime::HigherRankedType, . env_predicate, . ); 642 ( 0.00%) let infer_projection = if potentially_unnormalized_candidates { . ensure_sufficient_stack(|| { . project::normalize_with_depth_to( . self, . obligation.param_env, . obligation.cause.clone(), . obligation.recursion_depth + 1, . infer_predicate.projection_ty, . &mut nested_obligations, . ) . }) . } else { 642 ( 0.00%) infer_predicate.projection_ty . }; . 321 ( 0.00%) self.infcx 642 ( 0.00%) .at(&obligation.cause, obligation.param_env) 642 ( 0.00%) .sup(obligation.predicate, infer_projection) 2,541 ( 0.00%) .map_or(false, |InferOk { obligations, value: () }| { . self.evaluate_predicates_recursively( . TraitObligationStackList::empty(&ProvisionalEvaluationCache::default()), . nested_obligations.into_iter().chain(obligations), . ) 624 ( 0.00%) .map_or(false, |res| res.may_apply()) . }) 2,889 ( 0.00%) } . . /////////////////////////////////////////////////////////////////////////// . // WINNOW . // . // Winnowing is the process of attempting to resolve ambiguity by . // probing further. During the winnowing process, we unify all . // type variables and then we also attempt to evaluate recursive . // bounds to see if they are satisfied. -- line 1544 ---------------------------------------- -- line 1550 ---------------------------------------- . /// See the comment for "SelectionCandidate" for more details. . fn candidate_should_be_dropped_in_favor_of( . &mut self, . sized_predicate: bool, . victim: &EvaluatedCandidate<'tcx>, . other: &EvaluatedCandidate<'tcx>, . needs_infer: bool, . ) -> bool { 2,764 ( 0.00%) if victim.candidate == other.candidate { . return true; . } . . // Check if a bound would previously have been removed when normalizing . // the param_env so that it can be given the lowest priority. See . // #50825 for the motivation for this. . let is_global = |cand: &ty::PolyTraitPredicate<'tcx>| { . cand.is_global() && !cand.has_late_bound_regions() . }; . . // (*) Prefer `BuiltinCandidate { has_nested: false }`, `PointeeCandidate`, . // `DiscriminantKindCandidate`, and `ConstDropCandidate` to anything else. . // . // This is a fix for #53123 and prevents winnowing from accidentally extending the . // lifetime of a variable. 49,933 ( 0.00%) match (&other.candidate, &victim.candidate) { . (_, AutoImplCandidate(..)) | (AutoImplCandidate(..), _) => { . bug!( . "default implementations shouldn't be recorded \ . when there are other valid candidates" . ); . } . . // (*) -- line 1582 ---------------------------------------- -- line 1633 ---------------------------------------- . } . . // Global bounds from the where clause should be ignored . // here (see issue #50825). Otherwise, we have a where . // clause so don't go around looking for impls. . // Arbitrarily give param candidates priority . // over projection and object candidates. . ( 3 ( 0.00%) ParamCandidate(ref cand), . ImplCandidate(..) . | ClosureCandidate . | GeneratorCandidate . | FnPointerCandidate { .. } . | BuiltinObjectCandidate . | BuiltinUnsizeCandidate . | TraitUpcastingUnsizeCandidate(_) . | BuiltinCandidate { .. } -- line 1649 ---------------------------------------- -- line 1674 ---------------------------------------- . } . (ObjectCandidate(_), ProjectionCandidate(_)) . | (ProjectionCandidate(_), ObjectCandidate(_)) => { . bug!("Have both object and projection candidate") . } . . // Arbitrarily give projection and object candidates priority. . ( 5,528 ( 0.00%) ObjectCandidate(_) | ProjectionCandidate(_), . ImplCandidate(..) . | ClosureCandidate . | GeneratorCandidate . | FnPointerCandidate { .. } . | BuiltinObjectCandidate . | BuiltinUnsizeCandidate . | TraitUpcastingUnsizeCandidate(_) . | BuiltinCandidate { .. } -- line 1690 ---------------------------------------- -- line 1696 ---------------------------------------- . | ClosureCandidate . | GeneratorCandidate . | FnPointerCandidate { .. } . | BuiltinObjectCandidate . | BuiltinUnsizeCandidate . | TraitUpcastingUnsizeCandidate(_) . | BuiltinCandidate { .. } . | TraitAliasCandidate(..), 11,056 ( 0.00%) ObjectCandidate(_) | ProjectionCandidate(_), . ) => false, . 27,640 ( 0.00%) (&ImplCandidate(other_def), &ImplCandidate(victim_def)) => { . // See if we can toss out `victim` based on specialization. . // This requires us to know *for sure* that the `other` impl applies . // i.e., `EvaluatedToOk`. . // . // FIXME(@lcnr): Using `modulo_regions` here seems kind of scary . // to me but is required for `std` to compile, so I didn't change it . // for now. . let tcx = self.tcx(); 11,056 ( 0.00%) if other.evaluation.must_apply_modulo_regions() { 21,128 ( 0.00%) if tcx.specializes((other_def, victim_def)) { . return true; . } . } . 13,775 ( 0.00%) if other.evaluation.must_apply_considering_regions() { 10,456 ( 0.00%) match tcx.impls_are_allowed_to_overlap(other_def, victim_def) { . Some(ty::ImplOverlapKind::Permitted { marker: true }) => { . // Subtle: If the predicate we are evaluating has inference . // variables, do *not* allow discarding candidates due to . // marker trait impls. . // . // Without this restriction, we could end up accidentally . // constrainting inference variables based on an arbitrarily . // chosen trait impl. -- line 1731 ---------------------------------------- -- line 1790 ---------------------------------------- . | BuiltinUnsizeCandidate . | TraitUpcastingUnsizeCandidate(_) . | BuiltinCandidate { has_nested: true } . | TraitAliasCandidate(..), . ) => false, . } . } . 9,080 ( 0.00%) fn sized_conditions( . &mut self, . obligation: &TraitObligation<'tcx>, . ) -> BuiltinImplConditions<'tcx> { . use self::BuiltinImplConditions::{Ambiguous, None, Where}; . . // NOTE: binder moved to (*) 2,724 ( 0.00%) let self_ty = self.infcx.shallow_resolve(obligation.predicate.skip_binder().self_ty()); . 4,552 ( 0.00%) match self_ty.kind() { . ty::Infer(ty::IntVar(_) | ty::FloatVar(_)) . | ty::Uint(_) . | ty::Int(_) . | ty::Bool . | ty::Float(_) . | ty::FnDef(..) . | ty::FnPtr(_) . | ty::RawPtr(..) -- line 1815 ---------------------------------------- -- line 1817 ---------------------------------------- . | ty::Ref(..) . | ty::Generator(..) . | ty::GeneratorWitness(..) . | ty::Array(..) . | ty::Closure(..) . | ty::Never . | ty::Error(_) => { . // safe for everything 386 ( 0.00%) Where(ty::Binder::dummy(Vec::new())) . } . . ty::Str | ty::Slice(_) | ty::Dynamic(..) | ty::Foreign(..) => None, . . ty::Tuple(tys) => Where( . obligation . .predicate 245 ( 0.00%) .rebind(tys.last().into_iter().map(|k| k.expect_ty()).collect()), . ), . . ty::Adt(def, substs) => { 640 ( 0.00%) let sized_crit = def.sized_constraint(self.tcx()); . // (*) binder moved here 1,600 ( 0.00%) Where( . obligation.predicate.rebind({ 320 ( 0.00%) sized_crit.iter().map(|ty| ty.subst(self.tcx(), substs)).collect() . }), . ) . } . . ty::Projection(_) | ty::Param(_) | ty::Opaque(..) => None, . ty::Infer(ty::TyVar(_)) => Ambiguous, . . ty::Placeholder(..) . | ty::Bound(..) . | ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => { . bug!("asked to assemble builtin bounds of unexpected type: {:?}", self_ty); . } . } 7,264 ( 0.00%) } . 4,064 ( 0.00%) fn copy_clone_conditions( . &mut self, . obligation: &TraitObligation<'tcx>, . ) -> BuiltinImplConditions<'tcx> { . // NOTE: binder moved to (*) 1,016 ( 0.00%) let self_ty = self.infcx.shallow_resolve(obligation.predicate.skip_binder().self_ty()); . . use self::BuiltinImplConditions::{Ambiguous, None, Where}; . 2,598 ( 0.00%) match *self_ty.kind() { . ty::Infer(ty::IntVar(_)) . | ty::Infer(ty::FloatVar(_)) . | ty::FnDef(..) . | ty::FnPtr(_) 24 ( 0.00%) | ty::Error(_) => Where(ty::Binder::dummy(Vec::new())), . . ty::Uint(_) . | ty::Int(_) . | ty::Bool . | ty::Float(_) . | ty::Char . | ty::RawPtr(..) . | ty::Never -- line 1879 ---------------------------------------- -- line 1886 ---------------------------------------- . ty::Dynamic(..) . | ty::Str . | ty::Slice(..) . | ty::Generator(..) . | ty::GeneratorWitness(..) . | ty::Foreign(..) . | ty::Ref(_, _, hir::Mutability::Mut) => None, . 10 ( 0.00%) ty::Tuple(tys) => { . // (*) binder moved here 48 ( 0.00%) Where(obligation.predicate.rebind(tys.iter().map(|k| k.expect_ty()).collect())) . } . 176 ( 0.00%) ty::Closure(_, substs) => { . // (*) binder moved here 528 ( 0.00%) let ty = self.infcx.shallow_resolve(substs.as_closure().tupled_upvars_ty()); 352 ( 0.00%) if let ty::Infer(ty::TyVar(_)) = ty.kind() { . // Not yet resolved. . Ambiguous . } else { 1,232 ( 0.00%) Where(obligation.predicate.rebind(substs.as_closure().upvar_tys().collect())) . } . } . . ty::Adt(..) | ty::Projection(..) | ty::Param(..) | ty::Opaque(..) => { . // Fallback to whatever user-defined impls exist in this case. . None . } . -- line 1914 ---------------------------------------- -- line 1920 ---------------------------------------- . } . . ty::Placeholder(..) . | ty::Bound(..) . | ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => { . bug!("asked to assemble builtin bounds of unexpected type: {:?}", self_ty); . } . } 3,048 ( 0.00%) } . . /// For default impls, we need to break apart a type into its . /// "constituent types" -- meaning, the types that it contains. . /// . /// Here are some (simple) examples: . /// . /// ``` . /// (i32, u32) -> [i32, u32] -- line 1936 ---------------------------------------- -- line 1937 ---------------------------------------- . /// Foo where struct Foo { x: i32, y: u32 } -> [i32, u32] . /// Bar where struct Bar { x: T, y: u32 } -> [i32, u32] . /// Zed where enum Zed { A(T), B(u32) } -> [i32, u32] . /// ``` . fn constituent_types_for_ty( . &self, . t: ty::Binder<'tcx, Ty<'tcx>>, . ) -> ty::Binder<'tcx, Vec>> { 80 ( 0.00%) match *t.skip_binder().kind() { . ty::Uint(_) . | ty::Int(_) . | ty::Bool . | ty::Float(_) . | ty::FnDef(..) . | ty::FnPtr(_) . | ty::Str . | ty::Error(_) -- line 1953 ---------------------------------------- -- line 1988 ---------------------------------------- . } . . ty::GeneratorWitness(types) => { . debug_assert!(!types.has_escaping_bound_vars()); . types.map_bound(|types| types.to_vec()) . } . . // For `PhantomData`, we pass `T`. 14 ( 0.00%) ty::Adt(def, substs) if def.is_phantom_data() => t.rebind(substs.types().collect()), . 7 ( 0.00%) ty::Adt(def, substs) => { 21 ( 0.00%) t.rebind(def.all_fields().map(|f| f.ty(self.tcx(), substs)).collect()) . } . . ty::Opaque(def_id, substs) => { . // We can resolve the `impl Trait` to its concrete type, . // which enforces a DAG between the functions requiring . // the auto trait bounds in question. . t.rebind(vec![self.tcx().type_of(def_id).subst(self.tcx(), substs)]) . } . } . } . 1,596 ( 0.00%) fn collect_predicates_for_types( . &mut self, . param_env: ty::ParamEnv<'tcx>, . cause: ObligationCause<'tcx>, . recursion_depth: usize, . trait_def_id: DefId, . types: ty::Binder<'tcx, Vec>>, . ) -> Vec> { . // Because the types were potentially derived from -- line 2019 ---------------------------------------- -- line 2030 ---------------------------------------- . // 2. Produce something like `&'0 i32 : Copy` . // 3. Re-bind the regions back to `for<'a> &'a i32 : Copy` . . types . .as_ref() . .skip_binder() // binder moved -\ . .iter() . .flat_map(|ty| { 444 ( 0.00%) let ty: ty::Binder<'tcx, Ty<'tcx>> = types.rebind(ty); // <----/ . 1,776 ( 0.00%) self.infcx.commit_unconditionally(|_| { 444 ( 0.00%) let placeholder_ty = self.infcx.replace_bound_vars_with_placeholders(ty); 740 ( 0.00%) let Normalized { value: normalized_ty, mut obligations } = 1,480 ( 0.00%) ensure_sufficient_stack(|| { . project::normalize_with_depth( . self, 148 ( 0.00%) param_env, . cause.clone(), 148 ( 0.00%) recursion_depth, 148 ( 0.00%) placeholder_ty, . ) . }); 1,628 ( 0.00%) let placeholder_obligation = predicate_for_trait_def( . self.tcx(), 148 ( 0.00%) param_env, . cause.clone(), 296 ( 0.00%) trait_def_id, . recursion_depth, . normalized_ty, . &[], . ); 888 ( 0.00%) obligations.push(placeholder_obligation); . obligations . }) . }) . .collect() 798 ( 0.00%) } . . /////////////////////////////////////////////////////////////////////////// . // Matching . // . // Matching is a common path used for both evaluation and . // confirmation. It basically unifies types that appear in impls . // and traits. This does affect the surrounding environment; . // therefore, when used during evaluation, match routines must be -- line 2074 ---------------------------------------- -- line 2075 ---------------------------------------- . // run inside of a `probe()` so that their side-effects are . // contained. . . fn rematch_impl( . &mut self, . impl_def_id: DefId, . obligation: &TraitObligation<'tcx>, . ) -> Normalized<'tcx, SubstsRef<'tcx>> { 73,020 ( 0.00%) match self.match_impl(impl_def_id, obligation) { 58,416 ( 0.00%) Ok(substs) => substs, . Err(()) => { . bug!( . "Impl {:?} was matchable against {:?} but now is not", . impl_def_id, . obligation . ); . } . } . } . 1,313,869 ( 0.01%) #[tracing::instrument(level = "debug", skip(self))] . fn match_impl( . &mut self, . impl_def_id: DefId, . obligation: &TraitObligation<'tcx>, . ) -> Result>, ()> { . let impl_trait_ref = self.tcx().impl_trait_ref(impl_def_id).unwrap(); . . // Before we create the substitutions and everything, first . // consider a "quick reject". This avoids creating more types . // and so forth that we need to. . if self.fast_reject_trait_refs(obligation, &impl_trait_ref) { 68,320 ( 0.00%) return Err(()); . } . . let placeholder_obligation = 244,937 ( 0.00%) self.infcx().replace_bound_vars_with_placeholders(obligation.predicate); 104,973 ( 0.00%) let placeholder_obligation_trait_ref = placeholder_obligation.trait_ref; . 174,955 ( 0.00%) let impl_substs = self.infcx.fresh_substs_for_item(obligation.cause.span, impl_def_id); . 69,982 ( 0.00%) let impl_trait_ref = impl_trait_ref.subst(self.tcx(), impl_substs); . . debug!(?impl_trait_ref); . 209,946 ( 0.00%) let Normalized { value: impl_trait_ref, obligations: mut nested_obligations } = 244,937 ( 0.00%) ensure_sufficient_stack(|| { . project::normalize_with_depth( . self, 34,991 ( 0.00%) obligation.param_env, . obligation.cause.clone(), 104,973 ( 0.00%) obligation.recursion_depth + 1, 69,982 ( 0.00%) impl_trait_ref, . ) . }); . . debug!(?impl_trait_ref, ?placeholder_obligation_trait_ref); . . let cause = ObligationCause::new( 34,991 ( 0.00%) obligation.cause.span, 69,982 ( 0.00%) obligation.cause.body_id, 314,919 ( 0.00%) ObligationCauseCode::MatchImpl(obligation.cause.clone(), impl_def_id), . ); . 69,982 ( 0.00%) let InferOk { obligations, .. } = self . .infcx 34,991 ( 0.00%) .at(&cause, obligation.param_env) . .eq(placeholder_obligation_trait_ref, impl_trait_ref) . .map_err(|e| debug!("match_impl: failed eq_trait_refs due to `{}`", e))?; . nested_obligations.extend(obligations); . 55,954 ( 0.00%) if !self.intercrate . && self.tcx().impl_polarity(impl_def_id) == ty::ImplPolarity::Reservation . { . debug!("match_impl: reservation impls only apply in intercrate mode"); . return Err(()); . } . . debug!(?impl_substs, ?nested_obligations, "match_impl: success"); 112,014 ( 0.00%) Ok(Normalized { value: impl_substs, obligations: nested_obligations }) . } . . fn fast_reject_trait_refs( . &mut self, . obligation: &TraitObligation<'_>, . impl_trait_ref: &ty::TraitRef<'_>, . ) -> bool { . // We can avoid creating type variables and doing the full . // substitution if we find that any of the input types, when . // simplified, do not match. . 207,453 ( 0.00%) iter::zip(obligation.predicate.skip_binder().trait_ref.substs, impl_trait_ref.substs).any( . |(obligation_arg, impl_arg)| { 806,850 ( 0.01%) match (obligation_arg.unpack(), impl_arg.unpack()) { . (GenericArgKind::Type(obligation_ty), GenericArgKind::Type(impl_ty)) => { . // Note, we simplify parameters for the obligation but not the . // impl so that we do not reject a blanket impl but do reject . // more concrete impls if we're searching for `T: Trait`. 1,075,656 ( 0.01%) let simplified_obligation_ty = fast_reject::simplify_type( . self.tcx(), . obligation_ty, . SimplifyParams::Yes, . StripReferences::No, . ); 806,742 ( 0.01%) let simplified_impl_ty = fast_reject::simplify_type( . self.tcx(), . impl_ty, . SimplifyParams::No, . StripReferences::No, . ); . 403,371 ( 0.00%) simplified_obligation_ty.is_some() . && simplified_impl_ty.is_some() . && simplified_obligation_ty != simplified_impl_ty . } . (GenericArgKind::Lifetime(_), GenericArgKind::Lifetime(_)) => { . // Lifetimes can never cause a rejection. . false . } . (GenericArgKind::Const(_), GenericArgKind::Const(_)) => { -- line 2194 ---------------------------------------- -- line 2201 ---------------------------------------- . } . }, . ) . } . . /// Normalize `where_clause_trait_ref` and try to match it against . /// `obligation`. If successful, return any predicates that . /// result from the normalization. 4,140 ( 0.00%) fn match_where_clause_trait_ref( . &mut self, . obligation: &TraitObligation<'tcx>, . where_clause_trait_ref: ty::PolyTraitRef<'tcx>, . ) -> Result>, ()> { . self.match_poly_trait_ref(obligation, where_clause_trait_ref) 3,680 ( 0.00%) } . . /// Returns `Ok` if `poly_trait_ref` being true implies that the . /// obligation is satisfied. . #[instrument(skip(self), level = "debug")] . fn match_poly_trait_ref( . &mut self, . obligation: &TraitObligation<'tcx>, . poly_trait_ref: ty::PolyTraitRef<'tcx>, . ) -> Result>, ()> { 2,014 ( 0.00%) self.infcx 460 ( 0.00%) .at(&obligation.cause, obligation.param_env) 6,042 ( 0.00%) .sup(obligation.predicate.to_poly_trait_ref(), poly_trait_ref) . .map(|InferOk { obligations, .. }| obligations) . .map_err(|_| ()) . } . . /////////////////////////////////////////////////////////////////////////// . // Miscellany . . fn match_fresh_trait_refs( . &self, . previous: ty::PolyTraitPredicate<'tcx>, . current: ty::PolyTraitPredicate<'tcx>, . param_env: ty::ParamEnv<'tcx>, . ) -> bool { 765 ( 0.00%) let mut matcher = ty::_match::Match::new(self.tcx(), param_env); . matcher.relate(previous, current).is_ok() . } . . fn push_stack<'o>( . &mut self, . previous_stack: TraitObligationStackList<'o, 'tcx>, . obligation: &'o TraitObligation<'tcx>, . ) -> TraitObligationStack<'o, 'tcx> { 321,388 ( 0.00%) let fresh_trait_pred = obligation.predicate.fold_with(&mut self.freshener); . . let dfn = previous_stack.cache.next_dfn(); 10,540 ( 0.00%) let depth = previous_stack.depth() + 1; 450,462 ( 0.00%) TraitObligationStack { . obligation, 264,310 ( 0.00%) fresh_trait_pred, . reached_depth: Cell::new(depth), . previous: previous_stack, . dfn, . depth, . } . } . . #[instrument(skip(self), level = "debug")] . fn closure_trait_ref_unnormalized( . &mut self, . obligation: &TraitObligation<'tcx>, . substs: SubstsRef<'tcx>, . ) -> ty::PolyTraitRef<'tcx> { 2,673 ( 0.00%) let closure_sig = substs.as_closure().sig(); . . debug!(?closure_sig); . . // (1) Feels icky to skip the binder here, but OTOH we know . // that the self-type is an unboxed closure type and hence is . // in fact unparameterized (or at least does not reference any . // regions bound in the obligation). Still probably some . // refactoring could make this nicer. 8,910 ( 0.00%) closure_trait_ref_and_return_type( . self.tcx(), 5,346 ( 0.00%) obligation.predicate.def_id(), 891 ( 0.00%) obligation.predicate.skip_binder().self_ty(), // (1) 3,564 ( 0.00%) closure_sig, . util::TupleArgumentsFlag::No, . ) . .map_bound(|(trait_ref, _)| trait_ref) . } . . fn generator_trait_ref_unnormalized( . &mut self, . obligation: &TraitObligation<'tcx>, -- line 2291 ---------------------------------------- -- line 2307 ---------------------------------------- . ) . .map_bound(|(trait_ref, ..)| trait_ref) . } . . /// Returns the obligations that are implied by instantiating an . /// impl or trait. The obligations are substituted and fully . /// normalized. This is used when confirming an impl or default . /// impl. 336,260 ( 0.00%) #[tracing::instrument(level = "debug", skip(self, cause, param_env))] . fn impl_or_trait_obligations( . &mut self, . cause: ObligationCause<'tcx>, . recursion_depth: usize, . param_env: ty::ParamEnv<'tcx>, . def_id: DefId, // of impl or trait . substs: SubstsRef<'tcx>, // for impl or trait . ) -> Vec> { -- line 2323 ---------------------------------------- -- line 2334 ---------------------------------------- . // V: Iterator, V: Sized, . // ::Item: Copy . // When we substitute, say, `V => IntoIter, U => $0`, the last . // obligation will normalize to `<$0 as Iterator>::Item = $1` and . // `$1: Copy`, so we must ensure the obligations are emitted in . // that order. . let predicates = tcx.predicates_of(def_id); . debug!(?predicates); 14,620 ( 0.00%) assert_eq!(predicates.parent, None); 43,860 ( 0.00%) let mut obligations = Vec::with_capacity(predicates.predicates.len()); . for (predicate, _) in predicates.predicates { . debug!(?predicate); 127,600 ( 0.00%) let predicate = normalize_with_depth_to( . self, . param_env, . cause.clone(), . recursion_depth, 25,520 ( 0.00%) predicate.subst(tcx, substs), . &mut obligations, . ); 255,200 ( 0.00%) obligations.push(Obligation { . cause: cause.clone(), . recursion_depth, . param_env, . predicate, . }); . } . . // We are performing deduplication here to avoid exponential blowups -- line 2362 ---------------------------------------- -- line 2363 ---------------------------------------- . // (#38528) from happening, but the real cause of the duplication is . // unknown. What we know is that the deduplication avoids exponential . // amount of predicates being propagated when processing deeply nested . // types. . // . // This code is hot enough that it's worth avoiding the allocation . // required for the FxHashSet when possible. Special-casing lengths 0, . // 1 and 2 covers roughly 75-80% of the cases. 30,450 ( 0.00%) if obligations.len() <= 1 { . // No possibility of duplicates. 8,568 ( 0.00%) } else if obligations.len() == 2 { . // Only two elements. Drop the second if they are equal. . if obligations[0] == obligations[1] { . obligations.truncate(1); . } . } else { . // Three or more elements. Use a general deduplication process. . let mut seen = FxHashSet::default(); 6,337 ( 0.00%) obligations.retain(|i| seen.insert(i.clone())); . } . 58,480 ( 0.00%) obligations . } . } . . trait TraitObligationExt<'tcx> { . fn derived_cause( . &self, . variant: fn(DerivedObligationCause<'tcx>) -> ObligationCauseCode<'tcx>, . ) -> ObligationCause<'tcx>; -- line 2392 ---------------------------------------- -- line 2408 ---------------------------------------- . */ . . let obligation = self; . . // NOTE(flaper87): As of now, it keeps track of the whole error . // chain. Ideally, we should have a way to configure this either . // by using -Z verbose or just a CLI argument. . let derived_cause = DerivedObligationCause { 59,068 ( 0.00%) parent_trait_pred: obligation.predicate, 29,403 ( 0.00%) parent_code: obligation.cause.clone_code(), . }; . let derived_code = variant(derived_cause); 177,041 ( 0.00%) ObligationCause::new(obligation.cause.span, obligation.cause.body_id, derived_code) . } . } . . impl<'o, 'tcx> TraitObligationStack<'o, 'tcx> { . fn list(&'o self) -> TraitObligationStackList<'o, 'tcx> { . TraitObligationStackList::with(self) . } . . fn cache(&self) -> &'o ProvisionalEvaluationCache<'tcx> { 12,363 ( 0.00%) self.previous.cache . } . . fn iter(&'o self) -> TraitObligationStackList<'o, 'tcx> { . self.list() . } . . /// Indicates that attempting to evaluate this stack entry . /// required accessing something from the stack at depth `reached_depth`. 32 ( 0.00%) fn update_reached_depth(&self, reached_depth: usize) { 16 ( 0.00%) assert!( 16 ( 0.00%) self.depth >= reached_depth, . "invoked `update_reached_depth` with something under this stack: \ . self.depth={} reached_depth={}", . self.depth, . reached_depth, . ); . debug!(reached_depth, "update_reached_depth"); . let mut p = self; 48 ( 0.00%) while reached_depth < p.depth { . debug!(?p.fresh_trait_pred, "update_reached_depth: marking as cycle participant"); 16 ( 0.00%) p.reached_depth.set(p.reached_depth.get().min(reached_depth)); 16 ( 0.00%) p = p.previous.head.unwrap(); . } 32 ( 0.00%) } . } . . /// The "provisional evaluation cache" is used to store intermediate cache results . /// when solving auto traits. Auto traits are unusual in that they can support . /// cycles. So, for example, a "proof tree" like this would be ok: . /// . /// - `Foo: Send` :- . /// - `Bar: Send` :- -- line 2462 ---------------------------------------- -- line 2540 ---------------------------------------- . /// evaluation. When we create an entry in the evaluation cache using this provisional . /// cache entry (see `on_completion`), we use this `dep_node` to ensure that future reads from . /// the cache will have all of the necessary incr comp dependencies tracked. . dep_node: DepNodeIndex, . } . . impl<'tcx> Default for ProvisionalEvaluationCache<'tcx> { . fn default() -> Self { 58,514 ( 0.00%) Self { dfn: Cell::new(0), map: Default::default() } . } . } . . impl<'tcx> ProvisionalEvaluationCache<'tcx> { . /// Get the next DFN in sequence (basically a counter). . fn next_dfn(&self) -> usize { 5,270 ( 0.00%) let result = self.dfn.get(); 21,080 ( 0.00%) self.dfn.set(result + 1); . result . } . . /// Check the provisional cache for any result for . /// `fresh_trait_ref`. If there is a hit, then you must consider . /// it an access to the stack slots at depth . /// `reached_depth` (from the returned value). . fn get_provisional( -- line 2564 ---------------------------------------- -- line 2663 ---------------------------------------- . fn on_completion( . &self, . dfn: usize, . mut op: impl FnMut(ty::PolyTraitPredicate<'tcx>, EvaluationResult, DepNodeIndex), . ) { . debug!(?dfn, "on_completion"); . . for (fresh_trait_pred, eval) in 23,471 ( 0.00%) self.map.borrow_mut().drain_filter(|_k, eval| eval.from_dfn >= dfn) . { . debug!(?fresh_trait_pred, ?eval, "on_completion"); . . op(fresh_trait_pred, eval.result, eval.dep_node); . } . } . } . -- line 2679 ---------------------------------------- -- line 2692 ---------------------------------------- . TraitObligationStackList { cache: r.cache(), head: Some(r) } . } . . fn head(&self) -> Option<&'o TraitObligationStack<'o, 'tcx>> { . self.head . } . . fn depth(&self) -> usize { 13,179 ( 0.00%) if let Some(head) = self.head { head.depth } else { 0 } . } . } . . impl<'o, 'tcx> Iterator for TraitObligationStackList<'o, 'tcx> { . type Item = &'o TraitObligationStack<'o, 'tcx>; . . fn next(&mut self) -> Option<&'o TraitObligationStack<'o, 'tcx>> { 13,859 ( 0.00%) let o = self.head?; 2,106 ( 0.00%) *self = o.previous; . Some(o) . } . } . . impl<'o, 'tcx> fmt::Debug for TraitObligationStack<'o, 'tcx> { . fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { . write!(f, "TraitObligationStack({:?})", self.obligation) . } -- line 2717 ---------------------------------------- 723,360 ( 0.00%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/library/alloc/src/vec/mod.rs -------------------------------------------------------------------------------- Ir -- line 417 ---------------------------------------- . /// # #![allow(unused_mut)] . /// let mut vec: Vec = Vec::new(); . /// ``` . #[inline] . #[rustc_const_stable(feature = "const_vec_new", since = "1.39.0")] . #[stable(feature = "rust1", since = "1.0.0")] . #[must_use] . pub const fn new() -> Self { 8,147,343 ( 0.05%) Vec { buf: RawVec::NEW, len: 0 } 401 ( 0.00%) } . . /// Constructs a new, empty `Vec` with the specified capacity. . /// . /// The vector will be able to hold exactly `capacity` elements without . /// reallocating. If `capacity` is 0, the vector will not allocate. . /// . /// It is important to note that although the returned vector has the . /// *capacity* specified, the vector will have a zero *length*. For an -- line 434 ---------------------------------------- -- line 601 ---------------------------------------- . /// vec.push(11); . /// assert_eq!(vec.len(), 11); . /// assert!(vec.capacity() >= 11); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[inline] . #[unstable(feature = "allocator_api", issue = "32838")] . pub fn with_capacity_in(capacity: usize, alloc: A) -> Self { 2,374,645 ( 0.02%) Vec { buf: RawVec::with_capacity_in(capacity, alloc), len: 0 } . } . . /// Creates a `Vec` directly from the raw components of another vector. . /// . /// # Safety . /// . /// This is highly unsafe, due to the number of invariants that aren't . /// checked: -- line 617 ---------------------------------------- -- line 677 ---------------------------------------- . /// // Put everything back together into a Vec . /// let rebuilt = Vec::from_raw_parts_in(p, len, cap, alloc.clone()); . /// assert_eq!(rebuilt, [4, 5, 6]); . /// } . /// ``` . #[inline] . #[unstable(feature = "allocator_api", issue = "32838")] . pub unsafe fn from_raw_parts_in(ptr: *mut T, length: usize, capacity: usize, alloc: A) -> Self { 171,772 ( 0.00%) unsafe { Vec { buf: RawVec::from_raw_parts_in(ptr, capacity, alloc), len: length } } . } . . /// Decomposes a `Vec` into its raw components. . /// . /// Returns the raw pointer to the underlying data, the length of . /// the vector (in elements), and the allocated capacity of the . /// data (in elements). These are the same arguments in the same . /// order as the arguments to [`from_raw_parts`]. -- line 693 ---------------------------------------- -- line 778 ---------------------------------------- . /// . /// ``` . /// let vec: Vec = Vec::with_capacity(10); . /// assert_eq!(vec.capacity(), 10); . /// ``` . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn capacity(&self) -> usize { 728,950 ( 0.00%) self.buf.capacity() . } . . /// Reserves capacity for at least `additional` more elements to be inserted . /// in the given `Vec`. The collection may reserve more space to avoid . /// frequent reallocations. After calling `reserve`, capacity will be . /// greater than or equal to `self.len() + additional`. Does nothing if . /// capacity is already sufficient. . /// -- line 794 ---------------------------------------- -- line 801 ---------------------------------------- . /// ``` . /// let mut vec = vec![1]; . /// vec.reserve(10); . /// assert!(vec.capacity() >= 11); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn reserve(&mut self, additional: usize) { 848,407 ( 0.01%) self.buf.reserve(self.len, additional); . } . . /// Reserves the minimum capacity for exactly `additional` more elements to . /// be inserted in the given `Vec`. After calling `reserve_exact`, . /// capacity will be greater than or equal to `self.len() + additional`. . /// Does nothing if the capacity is already sufficient. . /// . /// Note that the allocator may give the collection more space than it -- line 817 ---------------------------------------- -- line 829 ---------------------------------------- . /// ``` . /// let mut vec = vec![1]; . /// vec.reserve_exact(10); . /// assert!(vec.capacity() >= 11); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn reserve_exact(&mut self, additional: usize) { 26,149 ( 0.00%) self.buf.reserve_exact(self.len, additional); . } . . /// Tries to reserve capacity for at least `additional` more elements to be inserted . /// in the given `Vec`. The collection may reserve more space to avoid . /// frequent reallocations. After calling `try_reserve`, capacity will be . /// greater than or equal to `self.len() + additional`. Does nothing if . /// capacity is already sufficient. . /// -- line 845 ---------------------------------------- -- line 930 ---------------------------------------- . /// assert!(vec.capacity() >= 3); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn shrink_to_fit(&mut self) { . // The capacity is never less than the length, and there's nothing to do when . // they are equal, so we can avoid the panic case in `RawVec::shrink_to_fit` . // by only calling it with a greater capacity. 63,714 ( 0.00%) if self.capacity() > self.len { 55,241 ( 0.00%) self.buf.shrink_to_fit(self.len); . } . } . . /// Shrinks the capacity of the vector with a lower bound. . /// . /// The capacity will remain at least as large as both the length . /// and the supplied value. . /// -- line 947 ---------------------------------------- -- line 990 ---------------------------------------- . /// let slice = vec.into_boxed_slice(); . /// assert_eq!(slice.into_vec().capacity(), 3); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn into_boxed_slice(mut self) -> Box<[T], A> { . unsafe { . self.shrink_to_fit(); 18,359 ( 0.00%) let me = ManuallyDrop::new(self); . let buf = ptr::read(&me.buf); . let len = me.len(); . buf.into_box(len).assume_init() . } . } . . /// Shortens the vector, keeping the first `len` elements and dropping . /// the rest. -- line 1006 ---------------------------------------- -- line 1040 ---------------------------------------- . /// let mut vec = vec![1, 2, 3]; . /// vec.truncate(0); . /// assert_eq!(vec, []); . /// ``` . /// . /// [`clear`]: Vec::clear . /// [`drain`]: Vec::drain . #[stable(feature = "rust1", since = "1.0.0")] 549,733 ( 0.00%) pub fn truncate(&mut self, len: usize) { . // This is safe because: . // . // * the slice passed to `drop_in_place` is valid; the `len > self.len` . // case avoids creating an invalid slice, and . // * the `len` of the vector is shrunk before calling `drop_in_place`, . // such that no value will be dropped twice in case `drop_in_place` . // were to panic once (if it panics twice, the program aborts). . unsafe { . // Note: It's intentional that this is `>` and not `>=`. . // Changing it to `>=` has negative performance . // implications in some cases. See #78884 for more. 488,378 ( 0.00%) if len > self.len { . return; . } . let remaining_len = self.len - len; . let s = ptr::slice_from_raw_parts_mut(self.as_mut_ptr().add(len), remaining_len); 594,385 ( 0.00%) self.len = len; 16,605 ( 0.00%) ptr::drop_in_place(s); . } 659,660 ( 0.00%) } . . /// Extracts a slice containing the entire vector. . /// . /// Equivalent to `&s[..]`. . /// . /// # Examples . /// . /// ``` -- line 1076 ---------------------------------------- -- line 1126 ---------------------------------------- . /// ``` . /// . /// [`as_mut_ptr`]: Vec::as_mut_ptr . #[stable(feature = "vec_as_ptr", since = "1.37.0")] . #[inline] . pub fn as_ptr(&self) -> *const T { . // We shadow the slice method of the same name to avoid going through . // `deref`, which creates an intermediate reference. 19,811,930 ( 0.13%) let ptr = self.buf.ptr(); . unsafe { . assume(!ptr.is_null()); . } . ptr . } . . /// Returns an unsafe mutable pointer to the vector's buffer. . /// -- line 1142 ---------------------------------------- -- line 1162 ---------------------------------------- . /// } . /// assert_eq!(&*x, &[0, 1, 2, 3]); . /// ``` . #[stable(feature = "vec_as_ptr", since = "1.37.0")] . #[inline] . pub fn as_mut_ptr(&mut self) -> *mut T { . // We shadow the slice method of the same name to avoid going through . // `deref_mut`, which creates an intermediate reference. 10,798,448 ( 0.07%) let ptr = self.buf.ptr(); . unsafe { . assume(!ptr.is_null()); . } . ptr . } . . /// Returns a reference to the underlying allocator. . #[unstable(feature = "allocator_api", issue = "32838")] -- line 1178 ---------------------------------------- -- line 1259 ---------------------------------------- . /// . /// Normally, here, one would use [`clear`] instead to correctly drop . /// the contents and thus not leak memory. . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub unsafe fn set_len(&mut self, new_len: usize) { . debug_assert!(new_len <= self.capacity()); . 1,633,373 ( 0.01%) self.len = new_len; 36,172 ( 0.00%) } . . /// Removes an element from the vector and returns it. . /// . /// The removed element is replaced by the last element of the vector. . /// . /// This does not preserve ordering, but is *O*(1). . /// If you need to preserve the element order, use [`remove`] instead. . /// -- line 1276 ---------------------------------------- -- line 1305 ---------------------------------------- . assert_failed(index, len); . } . unsafe { . // We replace self[index] with the last element. Note that if the . // bounds check above succeeds there must be a last element (which . // can be self[index] itself). . let value = ptr::read(self.as_ptr().add(index)); . let base_ptr = self.as_mut_ptr(); 22 ( 0.00%) ptr::copy(base_ptr.add(len - 1), base_ptr.add(index), 1); . self.set_len(len - 1); . value . } . } . . /// Inserts an element at position `index` within the vector, shifting all . /// elements after it to the right. . /// -- line 1321 ---------------------------------------- -- line 1329 ---------------------------------------- . /// let mut vec = vec![1, 2, 3]; . /// vec.insert(1, 4); . /// assert_eq!(vec, [1, 4, 2, 3]); . /// vec.insert(4, 5); . /// assert_eq!(vec, [1, 4, 2, 3, 5]); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] 10,780 ( 0.00%) pub fn insert(&mut self, index: usize, element: T) { . #[cold] . #[inline(never)] . fn assert_failed(index: usize, len: usize) -> ! { . panic!("insertion index (is {}) should be <= len (is {})", index, len); . } . 1,571 ( 0.00%) let len = self.len(); 4,766 ( 0.00%) if index > len { . assert_failed(index, len); . } . . // space for the new element 7,464 ( 0.00%) if len == self.buf.capacity() { . self.reserve(1); . } . . unsafe { . // infallible . // The spot to put the new value . { . let p = self.as_mut_ptr().add(index); . // Shift everything over to make space. (Duplicating the . // `index`th element into two consecutive places.) 10,995 ( 0.00%) ptr::copy(p, p.offset(1), len - index); . // Write it in, overwriting the first copy of the `index`th . // element. . ptr::write(p, element); . } 7,392 ( 0.00%) self.set_len(len + 1); . } 9,240 ( 0.00%) } . . /// Removes and returns the element at position `index` within the vector, . /// shifting all elements after it to the left. . /// . /// Note: Because this shifts over the remaining elements, it has a . /// worst-case performance of *O*(*n*). If you don't need the order of elements . /// to be preserved, use [`swap_remove`] instead. If you'd like to remove . /// elements from the beginning of the `Vec`, consider using -- line 1376 ---------------------------------------- -- line 1395 ---------------------------------------- . pub fn remove(&mut self, index: usize) -> T { . #[cold] . #[inline(never)] . #[track_caller] . fn assert_failed(index: usize, len: usize) -> ! { . panic!("removal index (is {}) should be < len (is {})", index, len); . } . 325 ( 0.00%) let len = self.len(); 1,279 ( 0.00%) if index >= len { . assert_failed(index, len); . } . unsafe { . // infallible . let ret; . { . // the place we are taking from. . let ptr = self.as_mut_ptr().add(index); . // copy it out, unsafely having a copy of the value on . // the stack and in the vector at the same time. 336 ( 0.00%) ret = ptr::read(ptr); . . // Shift everything down to fill in that spot. 986 ( 0.00%) ptr::copy(ptr.offset(1), ptr, len - index - 1); . } 325 ( 0.00%) self.set_len(len - 1); . ret . } . } . . /// Retains only the elements specified by the predicate. . /// . /// In other words, remove all elements `e` such that `f(&e)` returns `false`. . /// This method operates in place, visiting each element exactly once in the -- line 1428 ---------------------------------------- -- line 1442 ---------------------------------------- . /// ``` . /// let mut vec = vec![1, 2, 3, 4, 5]; . /// let keep = [false, true, true, false, true]; . /// let mut iter = keep.iter(); . /// vec.retain(|_| *iter.next().unwrap()); . /// assert_eq!(vec, [2, 3, 5]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] 952,902 ( 0.01%) pub fn retain(&mut self, mut f: F) . where . F: FnMut(&T) -> bool, . { 31,958 ( 0.00%) self.retain_mut(|elem| f(elem)); 932,736 ( 0.01%) } . . /// Retains only the elements specified by the predicate, passing a mutable reference to it. . /// . /// In other words, remove all elements `e` such that `f(&mut e)` returns `false`. . /// This method operates in place, visiting each element exactly once in the . /// original order, and preserves the order of the retained elements. . /// . /// # Examples -- line 1463 ---------------------------------------- -- line 1474 ---------------------------------------- . /// }); . /// assert_eq!(vec, [2, 3, 4]); . /// ``` . #[unstable(feature = "vec_retain_mut", issue = "90829")] . pub fn retain_mut(&mut self, mut f: F) . where . F: FnMut(&mut T) -> bool, . { 117,865 ( 0.00%) let original_len = self.len(); . // Avoid double drop if the drop guard is not executed, . // since we may make some holes during the process. . unsafe { self.set_len(0) }; . . // Vec: [Kept, Kept, Hole, Hole, Hole, Hole, Unchecked, Unchecked] . // |<- processed len ->| ^- next to check . // |<- deleted cnt ->| . // |<- original_len ->| -- line 1490 ---------------------------------------- -- line 1499 ---------------------------------------- . v: &'a mut Vec, . processed_len: usize, . deleted_cnt: usize, . original_len: usize, . } . . impl Drop for BackshiftOnDrop<'_, T, A> { . fn drop(&mut self) { 87,171 ( 0.00%) if self.deleted_cnt > 0 { . // SAFETY: Trailing unchecked items must be valid since we never touch them. . unsafe { . ptr::copy( . self.v.as_ptr().add(self.processed_len), 64,376 ( 0.00%) self.v.as_mut_ptr().add(self.processed_len - self.deleted_cnt), . self.original_len - self.processed_len, . ); . } . } . // SAFETY: After filling holes, all items are in contiguous memory. . unsafe { 2 ( 0.00%) self.v.set_len(self.original_len - self.deleted_cnt); . } . } . } . . let mut g = BackshiftOnDrop { v: self, processed_len: 0, deleted_cnt: 0, original_len }; . . fn process_loop( . original_len: usize, . f: &mut F, . g: &mut BackshiftOnDrop<'_, T, A>, . ) where . F: FnMut(&mut T) -> bool, . { 1,795,171 ( 0.01%) while g.processed_len != original_len { . // SAFETY: Unchecked element must be valid. . let cur = unsafe { &mut *g.v.as_mut_ptr().add(g.processed_len) }; 542,092 ( 0.00%) if !f(cur) { . // Advance early to avoid double drop if `drop_in_place` panicked. 112,725 ( 0.00%) g.processed_len += 1; 60,882 ( 0.00%) g.deleted_cnt += 1; . // SAFETY: We never touch this element again after dropped. 2,701 ( 0.00%) unsafe { ptr::drop_in_place(cur) }; . // We already advanced the counter. . if DELETED { . continue; . } else { . break; . } . } . if DELETED { . // SAFETY: `deleted_cnt` > 0, so the hole slot must not overlap with current element. . // We use copy for move, and never touch this element again. . unsafe { 101,658 ( 0.00%) let hole_slot = g.v.as_mut_ptr().add(g.processed_len - g.deleted_cnt); . ptr::copy_nonoverlapping(cur, hole_slot, 1); . } . } 93,365 ( 0.00%) g.processed_len += 1; . } . } . . // Stage 1: Nothing was deleted. . process_loop::(original_len, &mut f, &mut g); . . // Stage 2: Some elements were deleted. . process_loop::(original_len, &mut f, &mut g); -- line 1565 ---------------------------------------- -- line 1606 ---------------------------------------- . /// ``` . /// let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"]; . /// . /// vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b)); . /// . /// assert_eq!(vec, ["foo", "bar", "baz", "bar"]); . /// ``` . #[stable(feature = "dedup_by", since = "1.16.0")] 28 ( 0.00%) pub fn dedup_by(&mut self, mut same_bucket: F) . where . F: FnMut(&mut T, &mut T) -> bool, . { 3,002 ( 0.00%) let len = self.len(); 9,956 ( 0.00%) if len <= 1 { . return; . } . . /* INVARIANT: vec.len() > read >= write > write-1 >= 0 */ . struct FillGapOnDrop<'a, T, A: core::alloc::Allocator> { . /* Offset of the element we want to check if it is duplicate */ . read: usize, . -- line 1627 ---------------------------------------- -- line 1670 ---------------------------------------- . let ptr = gap.vec.as_mut_ptr(); . . /* Drop items while going through Vec, it should be more efficient than . * doing slice partition_dedup + truncate */ . . /* SAFETY: Because of the invariant, read_ptr, prev_ptr and write_ptr . * are always in-bounds and read_ptr never aliases prev_ptr */ . unsafe { 22,595 ( 0.00%) while gap.read < len { . let read_ptr = ptr.add(gap.read); . let prev_ptr = ptr.add(gap.write.wrapping_sub(1)); . 1,050 ( 0.00%) if same_bucket(&mut *read_ptr, &mut *prev_ptr) { . // Increase `gap.read` now since the drop may panic. . gap.read += 1; . /* We have found duplicate, drop it in-place */ . ptr::drop_in_place(read_ptr); . } else { . let write_ptr = ptr.add(gap.write); . . /* Because `read_ptr` can be equal to `write_ptr`, we either . * have to use `copy` or conditional `copy_nonoverlapping`. . * Looks like the first option is faster. */ . ptr::copy(read_ptr, write_ptr, 1); . . /* We have filled that place, so go further */ 13,197 ( 0.00%) gap.write += 1; . gap.read += 1; . } . } . . /* Technically we could let `gap` clean up with its Drop, but . * when `same_bucket` is guaranteed to not panic, this bloats a little . * the codegen, so we just do it manually */ . gap.vec.set_len(gap.write); . mem::forget(gap); . } 32 ( 0.00%) } . . /// Appends an element to the back of a collection. . /// . /// # Panics . /// . /// Panics if the new capacity exceeds `isize::MAX` bytes. . /// . /// # Examples -- line 1715 ---------------------------------------- -- line 1717 ---------------------------------------- . /// ``` . /// let mut vec = vec![1, 2]; . /// vec.push(3); . /// assert_eq!(vec, [1, 2, 3]); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] 300 ( 0.00%) pub fn push(&mut self, value: T) { . // This will panic or abort if we would allocate > isize::MAX bytes . // or if the length increment would overflow for zero-sized types. 10,054,982 ( 0.07%) if self.len == self.buf.capacity() { 1,048,132 ( 0.01%) self.buf.reserve_for_push(self.len); . } . unsafe { 468,326 ( 0.00%) let end = self.as_mut_ptr().add(self.len); . ptr::write(end, value); 14,290,534 ( 0.10%) self.len += 1; . } 240 ( 0.00%) } . . /// Removes the last element from a vector and returns it, or [`None`] if it . /// is empty. . /// . /// If you'd like to pop the first element, consider using . /// [`VecDeque::pop_front`] instead. . /// . /// [`VecDeque::pop_front`]: crate::collections::VecDeque::pop_front -- line 1744 ---------------------------------------- -- line 1748 ---------------------------------------- . /// ``` . /// let mut vec = vec![1, 2, 3]; . /// assert_eq!(vec.pop(), Some(3)); . /// assert_eq!(vec, [1, 2]); . /// ``` . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn pop(&mut self) -> Option { 3,135,427 ( 0.02%) if self.len == 0 { 536 ( 0.00%) None . } else { . unsafe { 2,398,946 ( 0.02%) self.len -= 1; 481,284 ( 0.00%) Some(ptr::read(self.as_ptr().add(self.len()))) . } . } . } . . /// Moves all the elements of `other` into `Self`, leaving `other` empty. . /// . /// # Panics . /// -- line 1769 ---------------------------------------- -- line 1776 ---------------------------------------- . /// let mut vec2 = vec![4, 5, 6]; . /// vec.append(&mut vec2); . /// assert_eq!(vec, [1, 2, 3, 4, 5, 6]); . /// assert_eq!(vec2, []); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[inline] . #[stable(feature = "append", since = "1.4.0")] 3,822 ( 0.00%) pub fn append(&mut self, other: &mut Self) { . unsafe { . self.append_elements(other.as_slice() as _); . other.set_len(0); . } 3,276 ( 0.00%) } . . /// Appends elements to `Self` from other buffer. . #[cfg(not(no_global_oom_handling))] . #[inline] . unsafe fn append_elements(&mut self, other: *const [T]) { . let count = unsafe { (*other).len() }; . self.reserve(count); 107,062 ( 0.00%) let len = self.len(); 12 ( 0.00%) unsafe { ptr::copy_nonoverlapping(other as *const T, self.as_mut_ptr().add(len), count) }; 785,937 ( 0.01%) self.len += count; . } . . /// Creates a draining iterator that removes the specified range in the vector . /// and yields the removed items. . /// . /// When the iterator **is** dropped, all elements in the range are removed . /// from the vector, even if the iterator was not fully consumed. If the . /// iterator **is not** dropped (with [`mem::forget`] for example), it is -- line 1807 ---------------------------------------- -- line 1834 ---------------------------------------- . // When the Drain is first created, it shortens the length of . // the source vector to make sure no uninitialized or moved-from elements . // are accessible at all if the Drain's destructor never gets to run. . // . // Drain will ptr::read out the values to remove. . // When finished, remaining tail of the vec is copied back to cover . // the hole, and the vector length is restored to the new length. . // 46,693 ( 0.00%) let len = self.len(); . let Range { start, end } = slice::range(range, ..len); . . unsafe { . // set self.vec length's to start, to be safe in case Drain is leaked . self.set_len(start); . // Use the borrow in the IterMut to indicate borrowing behavior of the . // whole Drain iterator (like &mut T). 1,544 ( 0.00%) let range_slice = slice::from_raw_parts_mut(self.as_mut_ptr().add(start), end - start); 11,504 ( 0.00%) Drain { . tail_start: end, 1,068 ( 0.00%) tail_len: len - end, . iter: range_slice.iter(), . vec: NonNull::from(self), . } . } . } . . /// Clears the vector, removing all values. . /// -- line 1861 ---------------------------------------- -- line 1869 ---------------------------------------- . /// . /// v.clear(); . /// . /// assert!(v.is_empty()); . /// ``` . #[inline] . #[stable(feature = "rust1", since = "1.0.0")] . pub fn clear(&mut self) { 973,607 ( 0.01%) self.truncate(0) . } . . /// Returns the number of elements in the vector, also referred to . /// as its 'length'. . /// . /// # Examples . /// . /// ``` -- line 1885 ---------------------------------------- -- line 1900 ---------------------------------------- . /// let mut v = Vec::new(); . /// assert!(v.is_empty()); . /// . /// v.push(1); . /// assert!(!v.is_empty()); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . pub fn is_empty(&self) -> bool { 1,136,784 ( 0.01%) self.len() == 0 . } . . /// Splits the collection into two at the given index. . /// . /// Returns a newly allocated vector containing the elements in the range . /// `[at, len)`. After the call, the original vector will be left containing . /// the elements `[0, at)` with its previous capacity unchanged. . /// -- line 1916 ---------------------------------------- -- line 1935 ---------------------------------------- . A: Clone, . { . #[cold] . #[inline(never)] . fn assert_failed(at: usize, len: usize) -> ! { . panic!("`at` split index (is {}) should be <= len (is {})", at, len); . } . 4,708 ( 0.00%) if at > self.len() { . assert_failed(at, self.len()); . } . 3,572 ( 0.00%) if at == 0 { . // the new vector can take over the original buffer and avoid the copy . return mem::replace( . self, . Vec::with_capacity_in(self.capacity(), self.allocator().clone()), . ); . } . . let other_len = self.len - at; -- line 1955 ---------------------------------------- -- line 1988 ---------------------------------------- . /// . /// let mut vec = vec![]; . /// let mut p = 1; . /// vec.resize_with(4, || { p *= 2; p }); . /// assert_eq!(vec, [2, 4, 8, 16]); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "vec_resize_with", since = "1.33.0")] 61,728 ( 0.00%) pub fn resize_with(&mut self, new_len: usize, f: F) . where . F: FnMut() -> T, . { 8,300 ( 0.00%) let len = self.len(); 16,600 ( 0.00%) if new_len > len { 59,626 ( 0.00%) self.extend_with(new_len - len, ExtendFunc(f)); . } else { . self.truncate(new_len); . } 53,428 ( 0.00%) } . . /// Consumes and leaks the `Vec`, returning a mutable reference to the contents, . /// `&'a mut [T]`. Note that the type `T` must outlive the chosen lifetime . /// `'a`. If the type has only static references, or none at all, then this . /// may be chosen to be `'static`. . /// . /// As of Rust 1.57, this method does not reallocate or shrink the `Vec`, . /// so the leaked allocation may include unused capacity that is not part -- line 2014 ---------------------------------------- -- line 2070 ---------------------------------------- . #[stable(feature = "vec_spare_capacity", since = "1.60.0")] . #[inline] . pub fn spare_capacity_mut(&mut self) -> &mut [MaybeUninit] { . // Note: . // This method is not implemented in terms of `split_at_spare_mut`, . // to prevent invalidation of pointers to the buffer. . unsafe { . slice::from_raw_parts_mut( 6 ( 0.00%) self.as_mut_ptr().add(self.len) as *mut MaybeUninit, 12,463 ( 0.00%) self.buf.capacity() - self.len, . ) . } . } . . /// Returns vector content as a slice of `T`, along with the remaining spare . /// capacity of the vector as a slice of `MaybeUninit`. . /// . /// The returned spare capacity slice can be used to fill the vector with data -- line 2087 ---------------------------------------- -- line 2189 ---------------------------------------- . /// assert_eq!(vec, ["hello", "world", "world"]); . /// . /// let mut vec = vec![1, 2, 3, 4]; . /// vec.resize(2, 0); . /// assert_eq!(vec, [1, 2]); . /// ``` . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "vec_resize", since = "1.5.0")] 99,440 ( 0.00%) pub fn resize(&mut self, new_len: usize, value: T) { 9,944 ( 0.00%) let len = self.len(); . 29,832 ( 0.00%) if new_len > len { 10,905 ( 0.00%) self.extend_with(new_len - len, ExtendElement(value)) . } else { . self.truncate(new_len); . } 13,464 ( 0.00%) } . . /// Clones and appends all elements in a slice to the `Vec`. . /// . /// Iterates over the slice `other`, clones each element, and then appends . /// it to this `Vec`. The `other` slice is traversed in-order. . /// . /// Note that this function is same as [`extend`] except that it is . /// specialized to work with slices instead. If and when Rust gets -- line 2213 ---------------------------------------- -- line 2271 ---------------------------------------- . trait ExtendWith { . fn next(&mut self) -> T; . fn last(self) -> T; . } . . struct ExtendElement(T); . impl ExtendWith for ExtendElement { . fn next(&mut self) -> T { 428 ( 0.00%) self.0.clone() . } . fn last(self) -> T { . self.0 . } . } . . struct ExtendFunc(F); . impl T> ExtendWith for ExtendFunc { -- line 2287 ---------------------------------------- -- line 2291 ---------------------------------------- . fn last(mut self) -> T { . (self.0)() . } . } . . impl Vec { . #[cfg(not(no_global_oom_handling))] . /// Extend the vector by `n` values, using the given generator. 745,657 ( 0.00%) fn extend_with>(&mut self, n: usize, mut value: E) { . self.reserve(n); . . unsafe { 15,562 ( 0.00%) let mut ptr = self.as_mut_ptr().add(self.len()); . // Use SetLenOnDrop to work around bug where compiler . // might not realize the store through `ptr` through self.set_len() . // don't alias. . let mut local_len = SetLenOnDrop::new(&mut self.len); . . // Write all elements except the last one . for _ in 1..n { . ptr::write(ptr, value.next()); . ptr = ptr.offset(1); . // Increment the length in every step in case next() panics . local_len.increment_len(1); . } . 598,307 ( 0.00%) if n > 0 { . // We can write the last element directly without cloning needlessly . ptr::write(ptr, value.last()); . local_len.increment_len(1); . } . . // len set by scope guard . } 592,427 ( 0.00%) } . } . . impl Vec { . /// Removes consecutive repeated elements in the vector according to the . /// [`PartialEq`] trait implementation. . /// . /// If the vector is sorted, this removes all duplicates. . /// -- line 2333 ---------------------------------------- -- line 2338 ---------------------------------------- . /// . /// vec.dedup(); . /// . /// assert_eq!(vec, [1, 2, 3, 2]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . pub fn dedup(&mut self) { 5 ( 0.00%) self.dedup_by(|a, b| a == b) . } . } . . //////////////////////////////////////////////////////////////////////////////// . // Internal methods and functions . //////////////////////////////////////////////////////////////////////////////// . . #[doc(hidden)] . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] 117,319 ( 0.00%) pub fn from_elem(elem: T, n: usize) -> Vec { 842,017 ( 0.01%) ::from_elem(elem, n, Global) 126,785 ( 0.00%) } . . #[doc(hidden)] . #[cfg(not(no_global_oom_handling))] . #[unstable(feature = "allocator_api", issue = "32838")] . pub fn from_elem_in(elem: T, n: usize, alloc: A) -> Vec { . ::from_elem(elem, n, alloc) . } . -- line 2367 ---------------------------------------- -- line 2424 ---------------------------------------- . // Common trait implementations for Vec . //////////////////////////////////////////////////////////////////////////////// . . #[stable(feature = "rust1", since = "1.0.0")] . impl ops::Deref for Vec { . type Target = [T]; . . fn deref(&self) -> &[T] { 26,300,319 ( 0.18%) unsafe { slice::from_raw_parts(self.as_ptr(), self.len) } 63 ( 0.00%) } . } . . #[stable(feature = "rust1", since = "1.0.0")] . impl ops::DerefMut for Vec { . fn deref_mut(&mut self) -> &mut [T] { 11,229,270 ( 0.07%) unsafe { slice::from_raw_parts_mut(self.as_mut_ptr(), self.len) } . } . } . . #[cfg(not(no_global_oom_handling))] . trait SpecCloneFrom { . fn clone_from(this: &mut Self, other: &Self); . } . -- line 2447 ---------------------------------------- -- line 2468 ---------------------------------------- . this.extend_from_slice(other); . } . } . . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . impl Clone for Vec { . #[cfg(not(test))] 628,141 ( 0.00%) fn clone(&self) -> Self { . let alloc = self.allocator().clone(); 2 ( 0.00%) <[T]>::to_vec_in(&**self, alloc) 783,197 ( 0.01%) } . . // HACK(japaric): with cfg(test) the inherent `[T]::to_vec` method, which is . // required for this method definition, is not available. Instead use the . // `slice::to_vec` function which is only available with cfg(test) . // NB see the slice::hack module in slice.rs for more information . #[cfg(test)] . fn clone(&self) -> Self { . let alloc = self.allocator().clone(); -- line 2487 ---------------------------------------- -- line 2518 ---------------------------------------- . message = "vector indices are of type `usize` or ranges of `usize`", . label = "vector indices are of type `usize` or ranges of `usize`" . )] . impl, A: Allocator> Index for Vec { . type Output = I::Output; . . #[inline] . fn index(&self, index: I) -> &Self::Output { 613,953 ( 0.00%) Index::index(&**self, index) . } . } . . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_on_unimplemented( . message = "vector indices are of type `usize` or ranges of `usize`", . label = "vector indices are of type `usize` or ranges of `usize`" . )] . impl, A: Allocator> IndexMut for Vec { . #[inline] . fn index_mut(&mut self, index: I) -> &mut Self::Output { 4,036 ( 0.00%) IndexMut::index_mut(&mut **self, index) . } . } . . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . impl FromIterator for Vec { . #[inline] . fn from_iter>(iter: I) -> Vec { 3,374,170 ( 0.02%) >::from_iter(iter.into_iter()) . } . } . . #[stable(feature = "rust1", since = "1.0.0")] . impl IntoIterator for Vec { . type Item = T; . type IntoIter = IntoIter; . -- line 2555 ---------------------------------------- -- line 2564 ---------------------------------------- . /// for s in v.into_iter() { . /// // s has type String, not &String . /// println!("{}", s); . /// } . /// ``` . #[inline] . fn into_iter(self) -> IntoIter { . unsafe { 1,488,511 ( 0.01%) let mut me = ManuallyDrop::new(self); . let alloc = ptr::read(me.allocator()); . let begin = me.as_mut_ptr(); . let end = if mem::size_of::() == 0 { . arith_offset(begin as *const i8, me.len() as isize) as *const T . } else { . begin.add(me.len()) as *const T . }; . let cap = me.buf.capacity(); 495,264 ( 0.00%) IntoIter { . buf: NonNull::new_unchecked(begin), . phantom: PhantomData, . cap, . alloc, . ptr: begin, . end, . } . } -- line 2589 ---------------------------------------- -- line 2591 ---------------------------------------- . } . . #[stable(feature = "rust1", since = "1.0.0")] . impl<'a, T, A: Allocator> IntoIterator for &'a Vec { . type Item = &'a T; . type IntoIter = slice::Iter<'a, T>; . . fn into_iter(self) -> slice::Iter<'a, T> { 468 ( 0.00%) self.iter() . } . } . . #[stable(feature = "rust1", since = "1.0.0")] . impl<'a, T, A: Allocator> IntoIterator for &'a mut Vec { . type Item = &'a mut T; . type IntoIter = slice::IterMut<'a, T>; . . fn into_iter(self) -> slice::IterMut<'a, T> { 1,266 ( 0.00%) self.iter_mut() . } . } . . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . impl Extend for Vec { . #[inline] 4,744 ( 0.00%) fn extend>(&mut self, iter: I) { 1,855,227 ( 0.01%) >::spec_extend(self, iter.into_iter()) 4,744 ( 0.00%) } . . #[inline] . fn extend_one(&mut self, item: T) { . self.push(item); . } . . #[inline] . fn extend_reserve(&mut self, additional: usize) { -- line 2627 ---------------------------------------- -- line 2636 ---------------------------------------- . fn extend_desugared>(&mut self, mut iterator: I) { . // This is the case for a general iterator. . // . // This function should be the moral equivalent of: . // . // for item in iterator { . // self.push(item); . // } 210,060 ( 0.00%) while let Some(element) = iterator.next() { 65,782 ( 0.00%) let len = self.len(); 738,677 ( 0.00%) if len == self.capacity() { 2,685 ( 0.00%) let (lower, _) = iterator.size_hint(); . self.reserve(lower.saturating_add(1)); . } . unsafe { . ptr::write(self.as_mut_ptr().add(len), element); . // Since next() executes user code which can panic we have to bump the length . // after each step. . // NB can't overflow since we would have had to alloc the address space 544,236 ( 0.00%) self.set_len(len + 1); . } . } 20,135 ( 0.00%) } . . /// Creates a splicing iterator that replaces the specified range in the vector . /// with the given `replace_with` iterator and yields the removed items. . /// `replace_with` does not need to be the same length as `range`. . /// . /// `range` is removed even if the iterator is not consumed until the end. . /// . /// It is unspecified how many elements are removed from the vector -- line 2666 ---------------------------------------- -- line 2693 ---------------------------------------- . #[cfg(not(no_global_oom_handling))] . #[inline] . #[stable(feature = "vec_splice", since = "1.21.0")] . pub fn splice(&mut self, range: R, replace_with: I) -> Splice<'_, I::IntoIter, A> . where . R: RangeBounds, . I: IntoIterator, . { 5,357 ( 0.00%) Splice { drain: self.drain(range), replace_with: replace_with.into_iter() } . } . . /// Creates an iterator which uses a closure to determine if an element should be removed. . /// . /// If the closure returns true, then the element is removed and yielded. . /// If the closure returns false, the element will remain in the vector and will not be yielded . /// by the iterator. . /// -- line 2709 ---------------------------------------- -- line 2745 ---------------------------------------- . /// assert_eq!(evens, vec![2, 4, 6, 8, 14]); . /// assert_eq!(odds, vec![1, 3, 5, 9, 11, 13, 15]); . /// ``` . #[unstable(feature = "drain_filter", reason = "recently added", issue = "43244")] . pub fn drain_filter(&mut self, filter: F) -> DrainFilter<'_, T, F, A> . where . F: FnMut(&mut T) -> bool, . { 8,470 ( 0.00%) let old_len = self.len(); . . // Guard against us getting leaked (leak amplification) . unsafe { . self.set_len(0); . } . 38,024 ( 0.00%) DrainFilter { vec: self, idx: 0, del: 0, old_len, pred: filter, panic_flag: false } . } . } . . /// Extend implementation that copies elements out of references before pushing them onto the Vec. . /// . /// This implementation is specialized for slice iterators, where it uses [`copy_from_slice`] to . /// append the entire slice at once. . /// . /// [`copy_from_slice`]: slice::copy_from_slice . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "extend_ref", since = "1.2.0")] . impl<'a, T: Copy + 'a, A: Allocator + 'a> Extend<&'a T> for Vec { 4,968 ( 0.00%) fn extend>(&mut self, iter: I) { . self.spec_extend(iter.into_iter()) 3,726 ( 0.00%) } . . #[inline] . fn extend_one(&mut self, &item: &'a T) { . self.push(item); . } . . #[inline] . fn extend_reserve(&mut self, additional: usize) { -- line 2783 ---------------------------------------- -- line 2803 ---------------------------------------- . #[inline] . fn cmp(&self, other: &Self) -> Ordering { . Ord::cmp(&**self, &**other) . } . } . . #[stable(feature = "rust1", since = "1.0.0")] . unsafe impl<#[may_dangle] T, A: Allocator> Drop for Vec { 2,476,365 ( 0.02%) fn drop(&mut self) { . unsafe { . // use drop for [T] . // use a raw slice to refer to the elements of the vector as weakest necessary type; . // could avoid questions of validity in certain cases 976,211 ( 0.01%) ptr::drop_in_place(ptr::slice_from_raw_parts_mut(self.as_mut_ptr(), self.len)) . } . // RawVec handles deallocation 2,924,264 ( 0.02%) } . } . . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_default_impls", issue = "87864")] . impl const Default for Vec { . /// Creates an empty `Vec`. . fn default() -> Vec { . Vec::new() -- line 2827 ---------------------------------------- -- line 2976 ---------------------------------------- . /// newly-allocated buffer with exactly the right capacity. . /// . /// # Examples . /// . /// ``` . /// assert_eq!(Box::from(vec![1, 2, 3]), vec![1, 2, 3].into_boxed_slice()); . /// ``` . fn from(v: Vec) -> Self { 4 ( 0.00%) v.into_boxed_slice() . } . } . . #[cfg(not(no_global_oom_handling))] . #[stable(feature = "rust1", since = "1.0.0")] . impl From<&str> for Vec { . /// Allocate a `Vec` and fill it with a UTF-8 string. . /// -- line 2992 ---------------------------------------- 7,787,514 ( 0.05%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_infer/src/infer/mod.rs -------------------------------------------------------------------------------- Ir -- line 108 ---------------------------------------- . suppress_errors: bool, . }, . } . . impl RegionckMode { . /// Indicates that the MIR borrowck will repeat these region . /// checks, so we should ignore errors if NLL is (unconditionally) . /// enabled. 1,220 ( 0.00%) pub fn for_item_body(tcx: TyCtxt<'_>) -> Self { . // FIXME(Centril): Once we actually remove `::Migrate` also make . // this always `true` and then proceed to eliminate the dead code. 1,220 ( 0.00%) match tcx.borrowck_mode() { . // If we're on Migrate mode, report AST region errors . BorrowckMode::Migrate => RegionckMode::Erase { suppress_errors: false }, . . // If we're on MIR, don't report AST region errors as they should be reported by NLL . BorrowckMode::Mir => RegionckMode::Erase { suppress_errors: true }, . } 2,440 ( 0.00%) } . } . . /// This type contains all the things within `InferCtxt` that sit within a . /// `RefCell` and are involved with taking/rolling back snapshots. Snapshot . /// operations are hot enough that we want only one call to `borrow_mut` per . /// call to `start_snapshot` and `rollback_to`. . pub struct InferCtxtInner<'tcx> { . /// Cache for projections. This cache is snapshotted along with the infcx. -- line 134 ---------------------------------------- -- line 202 ---------------------------------------- . /// type instantiations (`ty::Infer`) to the actual opaque . /// type (`ty::Opaque`). Used during fallback to map unconstrained . /// opaque type inference variables to their corresponding . /// opaque type. . pub opaque_types_vars: FxHashMap, Ty<'tcx>>, . } . . impl<'tcx> InferCtxtInner<'tcx> { 162,575 ( 0.00%) fn new() -> InferCtxtInner<'tcx> { 1,105,510 ( 0.01%) InferCtxtInner { . projection_cache: Default::default(), . type_variable_storage: type_variable::TypeVariableStorage::new(), . undo_log: InferCtxtUndoLogs::default(), . const_unification_storage: ut::UnificationTableStorage::new(), . int_unification_storage: ut::UnificationTableStorage::new(), . float_unification_storage: ut::UnificationTableStorage::new(), 97,545 ( 0.00%) region_constraint_storage: Some(RegionConstraintStorage::new()), . region_obligations: vec![], . opaque_types: Default::default(), . opaque_types_vars: Default::default(), . } 195,090 ( 0.00%) } . . #[inline] . pub fn region_obligations(&self) -> &[(hir::HirId, RegionObligation<'tcx>)] { . &self.region_obligations . } . . #[inline] . pub fn projection_cache(&mut self) -> traits::ProjectionCache<'_, 'tcx> { 21,220 ( 0.00%) self.projection_cache.with_log(&mut self.undo_log) . } . . #[inline] . fn type_variables(&mut self) -> type_variable::TypeVariableTable<'_, 'tcx> { 3,967,316 ( 0.03%) self.type_variable_storage.with_log(&mut self.undo_log) . } . . #[inline] . fn int_unification_table( . &mut self, . ) -> ut::UnificationTable< . ut::InPlace< . ty::IntVid, . &mut ut::UnificationStorage, . &mut InferCtxtUndoLogs<'tcx>, . >, . > { 121,489 ( 0.00%) self.int_unification_storage.with_log(&mut self.undo_log) . } . . #[inline] . fn float_unification_table( . &mut self, . ) -> ut::UnificationTable< . ut::InPlace< . ty::FloatVid, -- line 258 ---------------------------------------- -- line 268 ---------------------------------------- . &mut self, . ) -> ut::UnificationTable< . ut::InPlace< . ty::ConstVid<'tcx>, . &mut ut::UnificationStorage>, . &mut InferCtxtUndoLogs<'tcx>, . >, . > { 28,295 ( 0.00%) self.const_unification_storage.with_log(&mut self.undo_log) . } . . #[inline] . pub fn unwrap_region_constraints(&mut self) -> RegionConstraintCollector<'_, 'tcx> { 141,749 ( 0.00%) self.region_constraint_storage . .as_mut() . .expect("region constraints already solved") 155,345 ( 0.00%) .with_log(&mut self.undo_log) . } . } . . pub struct InferCtxt<'a, 'tcx> { . pub tcx: TyCtxt<'tcx>, . . /// The `DefId` of the item in whose context we are performing inference or typeck. . /// It is used to check whether an opaque type use is a defining use. -- line 292 ---------------------------------------- -- line 361 ---------------------------------------- . /// item we are type-checking, and just consider those names as . /// part of the root universe. So this would only get incremented . /// when we enter into a higher-ranked (`for<..>`) type or trait . /// bound. . universe: Cell, . } . . /// See the `error_reporting` module for more details. 269,696 ( 0.00%) #[derive(Clone, Copy, Debug, PartialEq, Eq, TypeFoldable)] . pub enum ValuePairs<'tcx> { . Types(ExpectedFound>), . Regions(ExpectedFound>), . Consts(ExpectedFound<&'tcx ty::Const<'tcx>>), . TraitRefs(ExpectedFound>), . PolyTraitRefs(ExpectedFound>), . } . -- line 377 ---------------------------------------- -- line 383 ---------------------------------------- . pub struct TypeTrace<'tcx> { . cause: ObligationCause<'tcx>, . values: ValuePairs<'tcx>, . } . . /// The origin of a `r1 <= r2` constraint. . /// . /// See `error_reporting` module for more details 359,530 ( 0.00%) #[derive(Clone, Debug)] . pub enum SubregionOrigin<'tcx> { . /// Arose from a subtyping relation 22,956 ( 0.00%) Subtype(Box>), . . /// When casting `&'a T` to an `&'b Trait` object, . /// relating `'a` to `'b` . RelateObjectBound(Span), . . /// Some type parameter was instantiated with the given type, . /// and that type must outlive some region. 628 ( 0.00%) RelateParamBound(Span, Ty<'tcx>, Option), . . /// The given region parameter was instantiated with a region . /// that must outlive some other region. . RelateRegionParamBound(Span), . . /// Creating a pointer `b` to contents of another reference . Reborrow(Span), . . /// Creating a pointer `b` to contents of an upvar . ReborrowUpvar(Span, ty::UpvarId), . . /// Data with type `Ty<'tcx>` was borrowed 1,117 ( 0.00%) DataBorrowed(Ty<'tcx>, Span), . . /// (&'a &'b T) where a >= b 690 ( 0.00%) ReferenceOutlivesReferent(Ty<'tcx>, Span), . . /// Comparing the signature and requirements of an impl method against . /// the containing trait. . CompareImplMethodObligation { span: Span, impl_item_def_id: DefId, trait_item_def_id: DefId }, . . /// Comparing the signature and requirements of an impl associated type . /// against the containing trait . CompareImplTypeObligation { span: Span, impl_item_def_id: DefId, trait_item_def_id: DefId }, -- line 426 ---------------------------------------- -- line 554 ---------------------------------------- . defining_use_anchor: Option, . } . . pub trait TyCtxtInferExt<'tcx> { . fn infer_ctxt(self) -> InferCtxtBuilder<'tcx>; . } . . impl<'tcx> TyCtxtInferExt<'tcx> for TyCtxt<'tcx> { 32,515 ( 0.00%) fn infer_ctxt(self) -> InferCtxtBuilder<'tcx> { 97,545 ( 0.00%) InferCtxtBuilder { tcx: self, defining_use_anchor: None, fresh_typeck_results: None } 32,515 ( 0.00%) } . } . . impl<'tcx> InferCtxtBuilder<'tcx> { . /// Used only by `rustc_typeck` during body type-checking/inference, . /// will initialize `in_progress_typeck_results` with fresh `TypeckResults`. . /// Will also change the scope for opaque type defining use checks to the given owner. 27,522 ( 0.00%) pub fn with_fresh_in_progress_typeck_results(mut self, table_owner: LocalDefId) -> Self { 33,638 ( 0.00%) self.fresh_typeck_results = Some(RefCell::new(ty::TypeckResults::new(table_owner))); 15,290 ( 0.00%) self.with_opaque_type_inference(table_owner) 21,406 ( 0.00%) } . . /// Whenever the `InferCtxt` should be able to handle defining uses of opaque types, . /// you need to call this function. Otherwise the opaque type will be treated opaquely. . /// . /// It is only meant to be called in two places, for typeck . /// (via `with_fresh_in_progress_typeck_results`) and for the inference context used . /// in mir borrowck. 2,698 ( 0.00%) pub fn with_opaque_type_inference(mut self, defining_use_anchor: LocalDefId) -> Self { 1,349 ( 0.00%) self.defining_use_anchor = Some(defining_use_anchor); 8,814 ( 0.00%) self 4,047 ( 0.00%) } . . /// Given a canonical value `C` as a starting point, create an . /// inference context that contains each of the bound values . /// within instantiated as a fresh variable. The `f` closure is . /// invoked with the new infcx, along with the instantiated value . /// `V` and a substitution `S`. This substitution `S` maps from . /// the bound values in `C` to their instantiated values in `V` . /// (in other words, `S(C) = V`). 25,660 ( 0.00%) pub fn enter_with_canonical( . &mut self, . span: Span, . canonical: &Canonical<'tcx, T>, . f: impl for<'a> FnOnce(InferCtxt<'a, 'tcx>, T, CanonicalVarValues<'tcx>) -> R, . ) -> R . where . T: TypeFoldable<'tcx>, . { . self.enter(|infcx| { 39,058 ( 0.00%) let (value, subst) = 1,727 ( 0.00%) infcx.instantiate_canonical_with_fresh_inference_vars(span, canonical); 57,618 ( 0.00%) f(infcx, value, subst) . }) 28,099 ( 0.00%) } . 215,957 ( 0.00%) pub fn enter(&mut self, f: impl for<'a> FnOnce(InferCtxt<'a, 'tcx>) -> R) -> R { 85,033 ( 0.00%) let InferCtxtBuilder { tcx, defining_use_anchor, ref fresh_typeck_results } = *self; . let in_progress_typeck_results = fresh_typeck_results.as_ref(); 1,421,367 ( 0.01%) f(InferCtxt { . tcx, . defining_use_anchor, . in_progress_typeck_results, 32,515 ( 0.00%) inner: RefCell::new(InferCtxtInner::new()), . lexical_region_resolutions: RefCell::new(None), . selection_cache: Default::default(), . evaluation_cache: Default::default(), . reported_trait_errors: Default::default(), . reported_closure_mismatch: Default::default(), . tainted_by_errors_flag: Cell::new(false), 32,515 ( 0.00%) err_count_on_creation: tcx.sess.err_count(), . in_snapshot: Cell::new(false), . skip_leak_check: Cell::new(false), . universe: Cell::new(ty::UniverseIndex::ROOT), . }) 239,584 ( 0.00%) } . } . . impl<'tcx, T> InferOk<'tcx, T> { . pub fn unit(self) -> InferOk<'tcx, ()> { . InferOk { value: (), obligations: self.obligations } . } . . /// Extracts `value`, registering any obligations into `fulfill_cx`. . pub fn into_value_registering_obligations( . self, . infcx: &InferCtxt<'_, 'tcx>, . fulfill_cx: &mut dyn TraitEngine<'tcx>, . ) -> T { 751 ( 0.00%) let InferOk { value, obligations } = self; 2,834 ( 0.00%) for obligation in obligations { . fulfill_cx.register_predicate_obligation(infcx, obligation); . } . value . } . } . . impl<'tcx> InferOk<'tcx, ()> { 20,978 ( 0.00%) pub fn into_obligations(self) -> PredicateObligations<'tcx> { 83,912 ( 0.00%) self.obligations 20,978 ( 0.00%) } . } . . #[must_use = "once you start a snapshot, you should always consume it"] . pub struct CombinedSnapshot<'a, 'tcx> { . undo_snapshot: Snapshot<'tcx>, . region_constraints_snapshot: RegionSnapshot, . universe: ty::UniverseIndex, . was_in_snapshot: bool, -- line 662 ---------------------------------------- -- line 674 ---------------------------------------- . let canonical = self.canonicalize_query((a, b), &mut OriginalQueryValues::default()); . debug!("canonical consts: {:?}", &canonical.value); . . self.tcx.try_unify_abstract_consts(canonical.value) . } . . pub fn is_in_snapshot(&self) -> bool { . self.in_snapshot.get() 55,129 ( 0.00%) } . 398,232 ( 0.00%) pub fn freshen>(&self, t: T) -> T { 448,011 ( 0.00%) t.fold_with(&mut self.freshener()) 448,011 ( 0.00%) } . . /// Returns the origin of the type variable identified by `vid`, or `None` . /// if this is not a type variable. . /// . /// No attempt is made to resolve `ty`. 2,508 ( 0.00%) pub fn type_var_origin(&'a self, ty: Ty<'tcx>) -> Option { 5,016 ( 0.00%) match *ty.kind() { 1,209 ( 0.00%) ty::Infer(ty::TyVar(vid)) => { 4,836 ( 0.00%) Some(*self.inner.borrow_mut().type_variables().var_origin(vid)) . } 45 ( 0.00%) _ => None, . } 5,016 ( 0.00%) } . 49,779 ( 0.00%) pub fn freshener<'b>(&'b self) -> TypeFreshener<'b, 'tcx> { . freshen::TypeFreshener::new(self, false) 49,779 ( 0.00%) } . . /// Like `freshener`, but does not replace `'static` regions. 165,744 ( 0.00%) pub fn freshener_keep_static<'b>(&'b self) -> TypeFreshener<'b, 'tcx> { . freshen::TypeFreshener::new(self, true) 165,744 ( 0.00%) } . 5,716 ( 0.00%) pub fn unsolved_variables(&self) -> Vec> { 2,858 ( 0.00%) let mut inner = self.inner.borrow_mut(); 2,858 ( 0.00%) let mut vars: Vec> = inner . .type_variables() . .unsolved_variables() . .into_iter() 2,418 ( 0.00%) .map(|t| self.tcx.mk_ty_var(t)) . .collect(); . vars.extend( . (0..inner.int_unification_table().len()) . .map(|i| ty::IntVid { index: i as u32 }) 4,156 ( 0.00%) .filter(|&vid| inner.int_unification_table().probe_value(vid).is_none()) 45 ( 0.00%) .map(|v| self.tcx.mk_int_var(v)), . ); . vars.extend( . (0..inner.float_unification_table().len()) . .map(|i| ty::FloatVid { index: i as u32 }) . .filter(|&vid| inner.float_unification_table().probe_value(vid).is_none()) . .map(|v| self.tcx.mk_float_var(v)), . ); . vars 10,003 ( 0.00%) } . 99,106 ( 0.00%) fn combine_fields( . &'a self, . trace: TypeTrace<'tcx>, . param_env: ty::ParamEnv<'tcx>, . ) -> CombineFields<'a, 'tcx> { 423,988 ( 0.00%) CombineFields { . infcx: self, 1,059,970 ( 0.01%) trace, . cause: None, . param_env, . obligations: PredicateObligations::new(), . } 99,106 ( 0.00%) } . . /// Clear the "currently in a snapshot" flag, invoke the closure, . /// then restore the flag to its original value. This flag is a . /// debugging measure designed to detect cases where we start a . /// snapshot, create type variables, and register obligations . /// which may involve those type variables in the fulfillment cx, . /// potentially leaving "dangling type variables" behind. . /// In such cases, an assertion will fail when attempting to -- line 753 ---------------------------------------- -- line 755 ---------------------------------------- . /// better than grovelling through megabytes of `RUSTC_LOG` output. . /// . /// HOWEVER, in some cases the flag is unhelpful. In particular, we . /// sometimes create a "mini-fulfilment-cx" in which we enroll . /// obligations. As long as this fulfillment cx is fully drained . /// before we return, this is not a problem, as there won't be any . /// escaping obligations in the main cx. In those cases, you can . /// use this function. 112 ( 0.00%) pub fn save_and_restore_in_snapshot_flag(&self, func: F) -> R . where . F: FnOnce(&Self) -> R, . { . let flag = self.in_snapshot.replace(false); 14,844 ( 0.00%) let result = func(self); . self.in_snapshot.set(flag); . result 126 ( 0.00%) } . 592,484 ( 0.00%) fn start_snapshot(&self) -> CombinedSnapshot<'a, 'tcx> { . debug!("start_snapshot()"); . . let in_snapshot = self.in_snapshot.replace(true); . . let mut inner = self.inner.borrow_mut(); . 1,777,452 ( 0.01%) CombinedSnapshot { . undo_snapshot: inner.undo_log.start_snapshot(), . region_constraints_snapshot: inner.unwrap_region_constraints().start_snapshot(), . universe: self.universe(), . was_in_snapshot: in_snapshot, . // Borrow typeck results "in progress" (i.e., during typeck) . // to ban writes from within a snapshot to them. 296,242 ( 0.00%) _in_progress_typeck_results: self . .in_progress_typeck_results . .map(|typeck_results| typeck_results.borrow()), . } 1,184,968 ( 0.01%) } . 1,447,402 ( 0.01%) #[instrument(skip(self, snapshot), level = "debug")] . fn rollback_to(&self, cause: &str, snapshot: CombinedSnapshot<'a, 'tcx>) { . let CombinedSnapshot { 131,582 ( 0.00%) undo_snapshot, 131,582 ( 0.00%) region_constraints_snapshot, 131,582 ( 0.00%) universe, 131,582 ( 0.00%) was_in_snapshot, 263,164 ( 0.00%) _in_progress_typeck_results, . } = snapshot; . . self.in_snapshot.set(was_in_snapshot); . self.universe.set(universe); . . let mut inner = self.inner.borrow_mut(); 131,582 ( 0.00%) inner.rollback_to(undo_snapshot); . inner.unwrap_region_constraints().rollback_to(region_constraints_snapshot); . } . 2,469,900 ( 0.02%) #[instrument(skip(self, snapshot), level = "debug")] . fn commit_from(&self, snapshot: CombinedSnapshot<'a, 'tcx>) { . let CombinedSnapshot { 164,660 ( 0.00%) undo_snapshot, . region_constraints_snapshot: _, . universe: _, 164,660 ( 0.00%) was_in_snapshot, 329,320 ( 0.00%) _in_progress_typeck_results, . } = snapshot; . . self.in_snapshot.set(was_in_snapshot); . . self.inner.borrow_mut().commit(undo_snapshot); . } . . /// Executes `f` and commit the bindings. 132,772 ( 0.00%) #[instrument(skip(self, f), level = "debug")] 162,459 ( 0.00%) pub fn commit_unconditionally(&self, f: F) -> R . where . F: FnOnce(&CombinedSnapshot<'a, 'tcx>) -> R, . { 14,769 ( 0.00%) let snapshot = self.start_snapshot(); 45,081 ( 0.00%) let r = f(&snapshot); 103,383 ( 0.00%) self.commit_from(snapshot); 88,441 ( 0.00%) r . } . . /// Execute `f` and commit the bindings if closure `f` returns `Ok(_)`. 1,181,487 ( 0.01%) #[instrument(skip(self, f), level = "debug")] 1,460,777 ( 0.01%) pub fn commit_if_ok(&self, f: F) -> Result . where . F: FnOnce(&CombinedSnapshot<'a, 'tcx>) -> Result, . { 222,522 ( 0.00%) let snapshot = self.start_snapshot(); 678,804 ( 0.00%) let r = f(&snapshot); . debug!("commit_if_ok() -- r.is_ok() = {}", r.is_ok()); 232,655 ( 0.00%) match r { . Ok(_) => { 1,068,229 ( 0.01%) self.commit_from(snapshot); . } . Err(_) => { 465,573 ( 0.00%) self.rollback_to("commit_if_ok -- error", snapshot); . } . } 1,248,720 ( 0.01%) r . } . . /// Execute `f` then unroll any bindings it creates. 485,675 ( 0.00%) #[instrument(skip(self, f), level = "debug")] 615,140 ( 0.00%) pub fn probe(&self, f: F) -> R . where . F: FnOnce(&CombinedSnapshot<'a, 'tcx>) -> R, . { 150,497 ( 0.00%) let snapshot = self.start_snapshot(); 281,587 ( 0.00%) let r = f(&snapshot); 693,193 ( 0.00%) self.rollback_to("probe", snapshot); 54,109 ( 0.00%) r . } . . /// If `should_skip` is true, then execute `f` then unroll any bindings it creates. 58,959 ( 0.00%) #[instrument(skip(self, f), level = "debug")] 78,612 ( 0.00%) pub fn probe_maybe_skip_leak_check(&self, should_skip: bool, f: F) -> R . where . F: FnOnce(&CombinedSnapshot<'a, 'tcx>) -> R, . { 13,102 ( 0.00%) let snapshot = self.start_snapshot(); 6,551 ( 0.00%) let was_skip_leak_check = self.skip_leak_check.get(); 13,102 ( 0.00%) if should_skip { . self.skip_leak_check.set(true); . } 26,204 ( 0.00%) let r = f(&snapshot); 58,959 ( 0.00%) self.rollback_to("probe", snapshot); . self.skip_leak_check.set(was_skip_leak_check); 78,612 ( 0.00%) r . } . . /// Scan the constraints produced since `snapshot` began and returns: . /// . /// - `None` -- if none of them involve "region outlives" constraints . /// - `Some(true)` -- if there are `'a: 'b` constraints where `'a` or `'b` is a placeholder . /// - `Some(false)` -- if there are `'a: 'b` constraints but none involve placeholders 15,072 ( 0.00%) pub fn region_constraints_added_in_snapshot( . &self, . snapshot: &CombinedSnapshot<'a, 'tcx>, . ) -> Option { 30,144 ( 0.00%) self.inner . .borrow_mut() . .unwrap_region_constraints() . .region_constraints_added_in_snapshot(&snapshot.undo_snapshot) 22,608 ( 0.00%) } . . pub fn add_given(&self, sub: ty::Region<'tcx>, sup: ty::RegionVid) { . self.inner.borrow_mut().unwrap_region_constraints().add_given(sub, sup); . } . 2,184 ( 0.00%) pub fn can_sub(&self, param_env: ty::ParamEnv<'tcx>, a: T, b: T) -> UnitResult<'tcx> . where . T: at::ToTrace<'tcx>, . { . let origin = &ObligationCause::dummy(); . self.probe(|_| { . self.at(origin, param_env).sub(a, b).map(|InferOk { obligations: _, .. }| { . // Ignore obligations, since we are unrolling . // everything anyway. . }) . }) 1,638 ( 0.00%) } . 10,392 ( 0.00%) pub fn can_eq(&self, param_env: ty::ParamEnv<'tcx>, a: T, b: T) -> UnitResult<'tcx> . where . T: at::ToTrace<'tcx>, . { . let origin = &ObligationCause::dummy(); . self.probe(|_| { . self.at(origin, param_env).eq(a, b).map(|InferOk { obligations: _, .. }| { . // Ignore obligations, since we are unrolling . // everything anyway. . }) . }) 7,794 ( 0.00%) } . 53,860 ( 0.00%) #[instrument(skip(self), level = "debug")] . pub fn sub_regions( . &self, . origin: SubregionOrigin<'tcx>, . a: ty::Region<'tcx>, . b: ty::Region<'tcx>, . ) { 48,474 ( 0.00%) self.inner.borrow_mut().unwrap_region_constraints().make_subregion(origin, a, b); . } . . /// Require that the region `r` be equal to one of the regions in . /// the set `regions`. . #[instrument(skip(self), level = "debug")] . pub fn member_constraint( . &self, . opaque_type_def_id: DefId, -- line 947 ---------------------------------------- -- line 969 ---------------------------------------- . /// to `subtype_predicate` -- that is, "coercing" `a` to `b` winds up . /// actually requiring `a <: b`. This is of course a valid coercion, . /// but it's not as flexible as `FnCtxt::coerce` would be. . /// . /// (We may refactor this in the future, but there are a number of . /// practical obstacles. Among other things, `FnCtxt::coerce` presently . /// records adjustments that are required on the HIR in order to perform . /// the coercion, and we don't currently have a way to manage that.) 1,341 ( 0.00%) pub fn coerce_predicate( . &self, . cause: &ObligationCause<'tcx>, . param_env: ty::ParamEnv<'tcx>, . predicate: ty::PolyCoercePredicate<'tcx>, . ) -> Option> { 894 ( 0.00%) let subtype_predicate = predicate.map_bound(|p| ty::SubtypePredicate { . a_is_expected: false, // when coercing from `a` to `b`, `b` is expected . a: p.a, . b: p.b, . }); 2,235 ( 0.00%) self.subtype_predicate(cause, param_env, subtype_predicate) 1,788 ( 0.00%) } . 11,412 ( 0.00%) pub fn subtype_predicate( . &self, . cause: &ObligationCause<'tcx>, . param_env: ty::ParamEnv<'tcx>, . predicate: ty::PolySubtypePredicate<'tcx>, . ) -> Option> { . // Check for two unresolved inference variables, in which case we can . // make no progress. This is partly a micro-optimization, but it's . // also an opportunity to "sub-unify" the variables. This isn't -- line 999 ---------------------------------------- -- line 1002 ---------------------------------------- . // earlier that they are sub-unified). . // . // Note that we can just skip the binders here because . // type variables can't (at present, at . // least) capture any of the things bound by this binder. . // . // Note that this sub here is not just for diagnostics - it has semantic . // effects as well. 951 ( 0.00%) let r_a = self.shallow_resolve(predicate.skip_binder().a); 951 ( 0.00%) let r_b = self.shallow_resolve(predicate.skip_binder().b); 5,956 ( 0.00%) match (r_a.kind(), r_b.kind()) { 1,222 ( 0.00%) (&ty::Infer(ty::TyVar(a_vid)), &ty::Infer(ty::TyVar(b_vid))) => { . self.inner.borrow_mut().type_variables().sub(a_vid, b_vid); 1,222 ( 0.00%) return None; . } . _ => {} . } . . Some(self.commit_if_ok(|_snapshot| { 340 ( 0.00%) let ty::SubtypePredicate { a_is_expected, a, b } = . self.replace_bound_vars_with_placeholders(predicate); . 680 ( 0.00%) let ok = self.at(cause, param_env).sub_exp(a_is_expected, a, b)?; . . Ok(ok.unit()) . })) 8,559 ( 0.00%) } . 16,236 ( 0.00%) pub fn region_outlives_predicate( . &self, . cause: &traits::ObligationCause<'tcx>, . predicate: ty::PolyRegionOutlivesPredicate<'tcx>, . ) -> UnitResult<'tcx> { . self.commit_if_ok(|_snapshot| { . let ty::OutlivesPredicate(r_a, r_b) = . self.replace_bound_vars_with_placeholders(predicate); . let origin = SubregionOrigin::from_obligation_cause(cause, || { . RelateRegionParamBound(cause.span) . }); 13,530 ( 0.00%) self.sub_regions(origin, r_b, r_a); // `b : a` ==> `a <= b` . Ok(()) . }) 10,824 ( 0.00%) } . . /// Number of type variables created so far. 209 ( 0.00%) pub fn num_ty_vars(&self) -> usize { . self.inner.borrow_mut().type_variables().num_vars() 418 ( 0.00%) } . 57,156 ( 0.00%) pub fn next_ty_var_id(&self, origin: TypeVariableOrigin) -> TyVid { 285,780 ( 0.00%) self.inner.borrow_mut().type_variables().new_var(self.universe(), origin) 85,734 ( 0.00%) } . 51,138 ( 0.00%) pub fn next_ty_var(&self, origin: TypeVariableOrigin) -> Ty<'tcx> { 197,037 ( 0.00%) self.tcx.mk_ty_var(self.next_ty_var_id(origin)) 76,707 ( 0.00%) } . 1,808 ( 0.00%) pub fn next_ty_var_in_universe( . &self, . origin: TypeVariableOrigin, . universe: ty::UniverseIndex, . ) -> Ty<'tcx> { 9,944 ( 0.00%) let vid = self.inner.borrow_mut().type_variables().new_var(universe, origin); 904 ( 0.00%) self.tcx.mk_ty_var(vid) 2,712 ( 0.00%) } . . pub fn next_const_var( . &self, . ty: Ty<'tcx>, . origin: ConstVariableOrigin, . ) -> &'tcx ty::Const<'tcx> { . self.tcx.mk_const_var(self.next_const_var_id(origin), ty) . } -- line 1074 ---------------------------------------- -- line 1090 ---------------------------------------- . pub fn next_const_var_id(&self, origin: ConstVariableOrigin) -> ConstVid<'tcx> { . self.inner.borrow_mut().const_unification_table().new_key(ConstVarValue { . origin, . val: ConstVariableValue::Unknown { universe: self.universe() }, . }) . } . . fn next_int_var_id(&self) -> IntVid { 6,815 ( 0.00%) self.inner.borrow_mut().int_unification_table().new_key(None) . } . 4,089 ( 0.00%) pub fn next_int_var(&self) -> Ty<'tcx> { . self.tcx.mk_int_var(self.next_int_var_id()) 5,452 ( 0.00%) } . . fn next_float_var_id(&self) -> FloatVid { . self.inner.borrow_mut().float_unification_table().new_key(None) . } . . pub fn next_float_var(&self) -> Ty<'tcx> { . self.tcx.mk_float_var(self.next_float_var_id()) . } . . /// Creates a fresh region variable with the next available index. . /// The variable will be created in the maximum universe created . /// thus far, allowing it to name any region created thus far. 9,535 ( 0.00%) pub fn next_region_var(&self, origin: RegionVariableOrigin) -> ty::Region<'tcx> { 424,698 ( 0.00%) self.next_region_var_in_universe(origin, self.universe()) 19,070 ( 0.00%) } . . /// Creates a fresh region variable with the next available index . /// in the given universe; typically, you can use . /// `next_region_var` and just use the maximal universe. 164,672 ( 0.00%) pub fn next_region_var_in_universe( . &self, . origin: RegionVariableOrigin, . universe: ty::UniverseIndex, . ) -> ty::Region<'tcx> { . let region_var = 1,070,368 ( 0.01%) self.inner.borrow_mut().unwrap_region_constraints().new_region_var(universe, origin); 411,680 ( 0.00%) self.tcx.mk_region(ty::ReVar(region_var)) 247,008 ( 0.00%) } . . /// Return the universe that the region `r` was created in. For . /// most regions (e.g., `'static`, named regions from the user, . /// etc) this is the root universe U0. For inference variables or . /// placeholders, however, it will return the universe which which . /// they are associated. 8,076 ( 0.00%) pub fn universe_of_region(&self, r: ty::Region<'tcx>) -> ty::UniverseIndex { . self.inner.borrow_mut().unwrap_region_constraints().universe(r) 12,114 ( 0.00%) } . . /// Number of region variables created so far. 11,050 ( 0.00%) pub fn num_region_vars(&self) -> usize { . self.inner.borrow_mut().unwrap_region_constraints().num_region_vars() 16,575 ( 0.00%) } . . /// Just a convenient wrapper of `next_region_var` for using during NLL. 22,884 ( 0.00%) pub fn next_nll_region_var(&self, origin: NllRegionVariableOrigin) -> ty::Region<'tcx> { . self.next_region_var(RegionVariableOrigin::Nll(origin)) 45,768 ( 0.00%) } . . /// Just a convenient wrapper of `next_region_var` for using during NLL. 273 ( 0.00%) pub fn next_nll_region_var_in_universe( . &self, . origin: NllRegionVariableOrigin, . universe: ty::UniverseIndex, . ) -> ty::Region<'tcx> { 2,015 ( 0.00%) self.next_region_var_in_universe(RegionVariableOrigin::Nll(origin), universe) 546 ( 0.00%) } . 612,024 ( 0.00%) pub fn var_for_def(&self, span: Span, param: &ty::GenericParamDef) -> GenericArg<'tcx> { 295,177 ( 0.00%) match param.kind { . GenericParamDefKind::Lifetime => { . // Create a region inference variable for the given . // region parameter definition. 43,669 ( 0.00%) self.next_region_var(EarlyBoundRegion(span, param.name)).into() . } . GenericParamDefKind::Type { .. } => { . // Create a type inference variable for the given . // type parameter definition. The substitutions are . // for actual parameters that may be referred to by . // the default of this type parameter, if it exists. . // e.g., `struct Foo(...);` when . // used in a path such as `Foo::::new()` will . // use an inference variable for `C` with `[T, U]` . // as the substitutions for the default, `(T, U)`. 118,656 ( 0.00%) let ty_var_id = self.inner.borrow_mut().type_variables().new_var( . self.universe(), 148,320 ( 0.00%) TypeVariableOrigin { . kind: TypeVariableOriginKind::TypeParameterDefinition( 29,664 ( 0.00%) param.name, 29,664 ( 0.00%) Some(param.def_id), . ), . span, . }, . ); . 29,664 ( 0.00%) self.tcx.mk_ty_var(ty_var_id).into() . } . GenericParamDefKind::Const { .. } => { . let origin = ConstVariableOrigin { . kind: ConstVariableOriginKind::ConstParameterDefinition( . param.name, . param.def_id, . ), . span, . }; . let const_var_id = 34,870 ( 0.00%) self.inner.borrow_mut().const_unification_table().new_key(ConstVarValue { . origin, . val: ConstVariableValue::Unknown { universe: self.universe() }, . }); 3,170 ( 0.00%) self.tcx.mk_const_var(const_var_id, self.tcx.type_of(param.def_id)).into() . } . } 25,360 ( 0.00%) } . . /// Given a set of generics defined on a type or impl, returns a substitution mapping each . /// type/region parameter to a fresh inference variable. 154,839 ( 0.00%) pub fn fresh_substs_for_item(&self, span: Span, def_id: DefId) -> SubstsRef<'tcx> { 687,263 ( 0.00%) InternalSubsts::for_item(self.tcx, def_id, |param, _| self.var_for_def(span, param)) 103,226 ( 0.00%) } . . /// Returns `true` if errors have been reported since this infcx was . /// created. This is sometimes used as a heuristic to skip . /// reporting errors that often occur as a result of earlier . /// errors, but where it's hard to be 100% sure (e.g., unresolved . /// inference variables, regionck errors). 4,948 ( 0.00%) pub fn is_tainted_by_errors(&self) -> bool { . debug!( . "is_tainted_by_errors(err_count={}, err_count_on_creation={}, \ . tainted_by_errors_flag={})", . self.tcx.sess.err_count(), . self.err_count_on_creation, . self.tainted_by_errors_flag.get() . ); . 84,950 ( 0.00%) if self.tcx.sess.err_count() > self.err_count_on_creation { . return true; // errors reported since this infcx was made . } . self.tainted_by_errors_flag.get() 7,422 ( 0.00%) } . . /// Set the "tainted by errors" flag to true. We call this when we . /// observe an error from a prior pass. . pub fn set_tainted_by_errors(&self) { . debug!("set_tainted_by_errors()"); . self.tainted_by_errors_flag.set(true) . } . . /// Process the region constraints and return any any errors that . /// result. After this, no more unification operations should be . /// done -- or the compiler will panic -- but it is legal to use . /// `resolve_vars_if_possible` as well as `fully_resolve`. 78,904 ( 0.00%) pub fn resolve_regions( . &self, . region_context: DefId, . outlives_env: &OutlivesEnvironment<'tcx>, . mode: RegionckMode, . ) -> Vec> { 214,168 ( 0.00%) let (var_infos, data) = { . let mut inner = self.inner.borrow_mut(); . let inner = &mut *inner; 11,272 ( 0.00%) assert!( 33,816 ( 0.00%) self.is_tainted_by_errors() || inner.region_obligations.is_empty(), . "region_obligations not empty: {:#?}", . inner.region_obligations . ); . inner . .region_constraint_storage . .take() . .expect("regions already resolved") . .with_log(&mut inner.undo_log) . .into_infos_and_data() 11,272 ( 0.00%) }; . . let region_rels = 11,272 ( 0.00%) &RegionRelations::new(self.tcx, region_context, outlives_env.free_region_map()); . 101,448 ( 0.00%) let (lexical_region_resolutions, errors) = 270,528 ( 0.00%) lexical_region_resolve::resolve(region_rels, var_infos, data, mode); . 45,088 ( 0.00%) let old_value = self.lexical_region_resolutions.replace(Some(lexical_region_resolutions)); 11,272 ( 0.00%) assert!(old_value.is_none()); . . errors 101,448 ( 0.00%) } . . /// Process the region constraints and report any errors that . /// result. After this, no more unification operations should be . /// done -- or the compiler will panic -- but it is legal to use . /// `resolve_vars_if_possible` as well as `fully_resolve`. 112,720 ( 0.00%) pub fn resolve_regions_and_report_errors( . &self, . region_context: DefId, . outlives_env: &OutlivesEnvironment<'tcx>, . mode: RegionckMode, . ) { 22,544 ( 0.00%) let errors = self.resolve_regions(region_context, outlives_env, mode); . 33,816 ( 0.00%) if !self.is_tainted_by_errors() { . // As a heuristic, just skip reporting region errors . // altogether if other errors have been reported while . // this infcx was in use. This is totally hokey but . // otherwise we have a hard time separating legit region . // errors from silly ones. 22,544 ( 0.00%) self.report_region_errors(&errors); . } 56,360 ( 0.00%) } . . /// Obtains (and clears) the current set of region . /// constraints. The inference context is still usable: further . /// unifications will simply add new constraints. . /// . /// This method is not meant to be used with normal lexical region . /// resolution. Rather, it is used in the NLL mode as a kind of . /// interim hack: basically we run normal type-check and generate -- line 1307 ---------------------------------------- -- line 1319 ---------------------------------------- . } . . /// Gives temporary access to the region constraint data. . pub fn with_region_constraints( . &self, . op: impl FnOnce(&RegionConstraintData<'tcx>) -> R, . ) -> R { . let mut inner = self.inner.borrow_mut(); 11,996 ( 0.00%) op(inner.unwrap_region_constraints().data()) . } . . pub fn region_var_origin(&self, vid: ty::RegionVid) -> RegionVariableOrigin { . let mut inner = self.inner.borrow_mut(); . let inner = &mut *inner; . inner . .region_constraint_storage . .as_mut() -- line 1335 ---------------------------------------- -- line 1338 ---------------------------------------- . .var_origin(vid) . } . . /// Takes ownership of the list of variable regions. This implies . /// that all the region constraints have already been taken, and . /// hence that `resolve_regions_and_report_errors` can never be . /// called. This is used only during NLL processing to "hand off" ownership . /// of the set of region variables into the NLL region context. 6,745 ( 0.00%) pub fn take_region_var_origins(&self) -> VarInfos { . let mut inner = self.inner.borrow_mut(); 25,631 ( 0.00%) let (var_infos, data) = inner . .region_constraint_storage . .take() . .expect("regions already resolved") . .with_log(&mut inner.undo_log) 1,349 ( 0.00%) .into_infos_and_data(); 1,349 ( 0.00%) assert!(data.is_empty()); . var_infos 10,792 ( 0.00%) } . . pub fn ty_to_string(&self, t: Ty<'tcx>) -> String { . self.resolve_vars_if_possible(t).to_string() . } . . /// If `TyVar(vid)` resolves to a type, return that type. Else, return the . /// universe index of `TyVar(vid)`. 15,288 ( 0.00%) pub fn probe_ty_var(&self, vid: TyVid) -> Result, ty::UniverseIndex> { . use self::type_variable::TypeVariableValue; . 45,864 ( 0.00%) match self.inner.borrow_mut().type_variables().probe(vid) { . TypeVariableValue::Known { value } => Ok(value), . TypeVariableValue::Unknown { universe } => Err(universe), . } 53,508 ( 0.00%) } . . /// Resolve any type variables found in `value` -- but only one . /// level. So, if the variable `?X` is bound to some type . /// `Foo`, then this would return `Foo` (but `?Y` may . /// itself be bound to a type). . /// . /// Useful when you only need to inspect the outermost level of . /// the type and don't care about nested types (or perhaps you . /// will be resolving them as well, e.g. in a loop). . pub fn shallow_resolve(&self, value: T) -> T . where . T: TypeFoldable<'tcx>, . { 427,526 ( 0.00%) value.fold_with(&mut ShallowResolver { infcx: self }) . } . 29,382 ( 0.00%) pub fn root_var(&self, var: ty::TyVid) -> ty::TyVid { . self.inner.borrow_mut().type_variables().root_var(var) 44,073 ( 0.00%) } . . /// Where possible, replaces type/const variables in . /// `value` with their final value. Note that region variables . /// are unaffected. If a type/const variable has not been unified, it . /// is left as is. This is an idempotent operation that does . /// not affect inference state in any way and so you can do it . /// at will. 136,780 ( 0.00%) pub fn resolve_vars_if_possible(&self, value: T) -> T . where . T: TypeFoldable<'tcx>, . { 439,954 ( 0.00%) if !value.needs_infer() { 315,104 ( 0.00%) return value; // Avoid duplicated subst-folding. . } 484,788 ( 0.00%) let mut r = resolve::OpportunisticVarResolver::new(self); 549,125 ( 0.00%) value.fold_with(&mut r) 125,118 ( 0.00%) } . . /// Returns the first unresolved variable contained in `T`. In the . /// process of visiting `T`, this will resolve (where possible) . /// type variables in `T`, but it never constructs the final, . /// resolved type, so it's more efficient than . /// `resolve_vars_if_possible()`. . pub fn unresolved_type_vars(&self, value: &T) -> Option<(Ty<'tcx>, Option)> . where -- line 1415 ---------------------------------------- -- line 1490 ---------------------------------------- . expected: &'tcx ty::Const<'tcx>, . actual: &'tcx ty::Const<'tcx>, . err: TypeError<'tcx>, . ) -> DiagnosticBuilder<'tcx> { . let trace = TypeTrace::consts(cause, true, expected, actual); . self.report_and_explain_type_error(trace, &err) . } . 49,572 ( 0.00%) pub fn replace_bound_vars_with_fresh_vars( . &self, . span: Span, . lbrct: LateBoundRegionConversionTime, . value: ty::Binder<'tcx, T>, . ) -> (T, BTreeMap>) . where . T: TypeFoldable<'tcx>, . { . let fld_r = 107,031 ( 0.00%) |br: ty::BoundRegion| self.next_region_var(LateBoundRegion(span, br.kind, lbrct)); . let fld_t = |_| { . self.next_ty_var(TypeVariableOrigin { . kind: TypeVariableOriginKind::MiscVariable, . span, . }) . }; . let fld_c = |_, ty| { . self.next_const_var( . ty, . ConstVariableOrigin { kind: ConstVariableOriginKind::MiscVariable, span }, . ) . }; 195,464 ( 0.00%) self.tcx.replace_bound_vars(value, fld_r, fld_t, fld_c) 33,048 ( 0.00%) } . . /// See the [`region_constraints::RegionConstraintCollector::verify_generic_bound`] method. 888 ( 0.00%) pub fn verify_generic_bound( . &self, . origin: SubregionOrigin<'tcx>, . kind: GenericKind<'tcx>, . a: ty::Region<'tcx>, . bound: VerifyBound<'tcx>, . ) { . debug!("verify_generic_bound({:?}, {:?} <: {:?})", kind, a, bound); . 333 ( 0.00%) self.inner . .borrow_mut() . .unwrap_region_constraints() 1,887 ( 0.00%) .verify_generic_bound(origin, kind, a, bound); 777 ( 0.00%) } . . /// Obtains the latest type of the given closure; this may be a . /// closure in the current function, in which case its . /// `ClosureKind` may not yet be known. 3,970 ( 0.00%) pub fn closure_kind(&self, closure_substs: SubstsRef<'tcx>) -> Option { 7,940 ( 0.00%) let closure_kind_ty = closure_substs.as_closure().kind_ty(); . let closure_kind_ty = self.shallow_resolve(closure_kind_ty); 5,955 ( 0.00%) closure_kind_ty.to_opt_closure_kind() . } . . /// Clears the selection, evaluation, and projection caches. This is useful when . /// repeatedly attempting to select an `Obligation` while changing only . /// its `ParamEnv`, since `FulfillmentContext` doesn't use probing. . pub fn clear_caches(&self) { . self.selection_cache.clear(); . self.evaluation_cache.clear(); . self.inner.borrow_mut().projection_cache().clear(); . } . . pub fn universe(&self) -> ty::UniverseIndex { 797,199 ( 0.01%) self.universe.get() 277,785 ( 0.00%) } . . /// Creates and return a fresh universe that extends all previous . /// universes. Updates `self.universe` to that new universe. 278 ( 0.00%) pub fn create_next_universe(&self) -> ty::UniverseIndex { 398 ( 0.00%) let u = self.universe.get().next_universe(); . self.universe.set(u); . u 278 ( 0.00%) } . . /// Resolves and evaluates a constant. . /// . /// The constant can be located on a trait like `::C`, in which case the given . /// substitutions and environment are used to resolve the constant. Alternatively if the . /// constant has generic parameters in scope the substitutions are used to evaluate the value of . /// the constant. For example in `fn foo() { let _ = [0; bar::()]; }` the repeat count . /// constant `bar::()` requires a substitution for `T`, if the substitution for `T` is still . /// too generic for the constant to be evaluated then `Err(ErrorHandled::TooGeneric)` is . /// returned. . /// . /// This handles inferences variables within both `param_env` and `substs` by . /// performing the operation on their respective canonical forms. 507 ( 0.00%) pub fn const_eval_resolve( . &self, . param_env: ty::ParamEnv<'tcx>, . unevaluated: ty::Unevaluated<'tcx>, . span: Option, . ) -> EvalToConstValueResult<'tcx> { 39 ( 0.00%) let substs = self.resolve_vars_if_possible(unevaluated.substs); . . // Postpone the evaluation of constants whose substs depend on inference . // variables . if substs.has_infer_types_or_consts() { . return Err(ErrorHandled::TooGeneric); . } . 39 ( 0.00%) let param_env_erased = self.tcx.erase_regions(param_env); 9 ( 0.00%) let substs_erased = self.tcx.erase_regions(substs); . . let unevaluated = ty::Unevaluated { . def: unevaluated.def, . substs: substs_erased, 78 ( 0.00%) promoted: unevaluated.promoted, . }; . . // The return value is the evaluated value which doesn't contain any reference to inference . // variables, thus we don't need to substitute back the original values. 468 ( 0.00%) self.tcx.const_eval_resolve(param_env_erased, unevaluated, span) 351 ( 0.00%) } . . /// If `typ` is a type variable of some kind, resolve it one level . /// (but do not resolve types found in the result). If `typ` is . /// not a type variable, just return it unmodified. . // FIXME(eddyb) inline into `ShallowResolver::visit_ty`. 5,100,192 ( 0.03%) fn shallow_resolve_ty(&self, typ: Ty<'tcx>) -> Ty<'tcx> { 3,012,883 ( 0.02%) match *typ.kind() { . ty::Infer(ty::TyVar(v)) => { . // Not entirely obvious: if `typ` is a type variable, . // it can be resolved to an int/float variable, which . // can then be recursively resolved, hence the . // recursion. Note though that we prevent type . // variables from unifying to other type variables . // directly (though they may be embedded . // structurally), and we prevent cycles in any case, . // so this recursion should always be of very limited . // depth. . // . // Note: if these two lines are combined into one we get . // dynamic borrow errors on `self.inner`. 1,560,120 ( 0.01%) let known = self.inner.borrow_mut().type_variables().probe(v).known(); . known.map_or(typ, |t| self.shallow_resolve_ty(t)) . } . 164,852 ( 0.00%) ty::Infer(ty::IntVar(v)) => self . .inner . .borrow_mut() . .int_unification_table() . .probe_value(v) 40,176 ( 0.00%) .map(|v| v.to_type(self.tcx)) . .unwrap_or(typ), . . ty::Infer(ty::FloatVar(v)) => self . .inner . .borrow_mut() . .float_unification_table() . .probe_value(v) . .map(|v| v.to_type(self.tcx)) . .unwrap_or(typ), . . _ => typ, . } 5,737,716 ( 0.04%) } . . /// `ty_or_const_infer_var_changed` is equivalent to one of these two: . /// * `shallow_resolve(ty) != ty` (where `ty.kind = ty::Infer(_)`) . /// * `shallow_resolve(ct) != ct` (where `ct.kind = ty::ConstKind::Infer(_)`) . /// . /// However, `ty_or_const_infer_var_changed` is more efficient. It's always . /// inlined, despite being large, because it has only two call sites that . /// are extremely hot (both in `traits::fulfill`'s checking of `stalled_on` -- line 1659 ---------------------------------------- -- line 1662 ---------------------------------------- . #[inline(always)] . pub fn ty_or_const_infer_var_changed(&self, infer_var: TyOrConstInferVar<'tcx>) -> bool { . match infer_var { . TyOrConstInferVar::Ty(v) => { . use self::type_variable::TypeVariableValue; . . // If `inlined_probe` returns a `Known` value, it never equals . // `ty::Infer(ty::TyVar(v))`. 15,725,791 ( 0.10%) match self.inner.borrow_mut().type_variables().inlined_probe(v) { . TypeVariableValue::Unknown { .. } => false, . TypeVariableValue::Known { .. } => true, . } . } . . TyOrConstInferVar::TyInt(v) => { . // If `inlined_probe_value` returns a value it's always a . // `ty::Int(_)` or `ty::UInt(_)`, which never matches a . // `ty::Infer(_)`. 32,930 ( 0.00%) self.inner.borrow_mut().int_unification_table().inlined_probe_value(v).is_some() . } . . TyOrConstInferVar::TyFloat(v) => { . // If `probe_value` returns a value it's always a . // `ty::Float(_)`, which never matches a `ty::Infer(_)`. . // . // Not `inlined_probe_value(v)` because this call site is colder. . self.inner.borrow_mut().float_unification_table().probe_value(v).is_some() -- line 1688 ---------------------------------------- -- line 1716 ---------------------------------------- . /// Equivalent to `ty::ConstKind::Infer(ty::InferConst::Var(_))`. . Const(ConstVid<'tcx>), . } . . impl<'tcx> TyOrConstInferVar<'tcx> { . /// Tries to extract an inference variable from a type or a constant, returns `None` . /// for types other than `ty::Infer(_)` (or `InferTy::Fresh*`) and . /// for constants other than `ty::ConstKind::Infer(_)` (or `InferConst::Fresh`). 28,252 ( 0.00%) pub fn maybe_from_generic_arg(arg: GenericArg<'tcx>) -> Option { . match arg.unpack() { . GenericArgKind::Type(ty) => Self::maybe_from_ty(ty), . GenericArgKind::Const(ct) => Self::maybe_from_const(ct), . GenericArgKind::Lifetime(_) => None, . } 28,252 ( 0.00%) } . . /// Tries to extract an inference variable from a type, returns `None` . /// for types other than `ty::Infer(_)` (or `InferTy::Fresh*`). 1,220 ( 0.00%) pub fn maybe_from_ty(ty: Ty<'tcx>) -> Option { 260,217 ( 0.00%) match *ty.kind() { 54,548 ( 0.00%) ty::Infer(ty::TyVar(v)) => Some(TyOrConstInferVar::Ty(v)), 4,142 ( 0.00%) ty::Infer(ty::IntVar(v)) => Some(TyOrConstInferVar::TyInt(v)), . ty::Infer(ty::FloatVar(v)) => Some(TyOrConstInferVar::TyFloat(v)), . _ => None, . } 1,220 ( 0.00%) } . . /// Tries to extract an inference variable from a constant, returns `None` . /// for constants other than `ty::ConstKind::Infer(_)` (or `InferConst::Fresh`). . pub fn maybe_from_const(ct: &'tcx ty::Const<'tcx>) -> Option { . match ct.val { . ty::ConstKind::Infer(InferConst::Var(v)) => Some(TyOrConstInferVar::Const(v)), . _ => None, . } -- line 1749 ---------------------------------------- -- line 1755 ---------------------------------------- . } . . impl<'a, 'tcx> TypeFolder<'tcx> for ShallowResolver<'a, 'tcx> { . fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { . self.infcx.tcx . } . . fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> { 925,486 ( 0.01%) self.infcx.shallow_resolve_ty(ty) . } . 26,536 ( 0.00%) fn fold_const(&mut self, ct: &'tcx ty::Const<'tcx>) -> &'tcx ty::Const<'tcx> { 21,760 ( 0.00%) if let ty::Const { val: ty::ConstKind::Infer(InferConst::Var(vid)), .. } = ct { 21,230 ( 0.00%) self.infcx . .inner . .borrow_mut() . .const_unification_table() 12,738 ( 0.00%) .probe_value(*vid) . .val . .known() . .unwrap_or(ct) . } else { . ct . } 33,170 ( 0.00%) } . } . . impl<'tcx> TypeTrace<'tcx> { . pub fn span(&self) -> Span { . self.cause.span . } . . pub fn types( -- line 1787 ---------------------------------------- -- line 1818 ---------------------------------------- . CompareImplTypeObligation { span, .. } => span, . } . } . . pub fn from_obligation_cause(cause: &traits::ObligationCause<'tcx>, default: F) -> Self . where . F: FnOnce() -> Self, . { 33,596 ( 0.00%) match *cause.code() { 7,512 ( 0.00%) traits::ObligationCauseCode::ReferenceOutlivesReferent(ref_type) => { 37,560 ( 0.00%) SubregionOrigin::ReferenceOutlivesReferent(ref_type, cause.span) . } . . traits::ObligationCauseCode::CompareImplMethodObligation { . impl_item_def_id, . trait_item_def_id, . } => SubregionOrigin::CompareImplMethodObligation { . span: cause.span, . impl_item_def_id, -- line 1836 ---------------------------------------- 13,994,564 ( 0.09%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/compiler/rustc_infer/src/infer/type_variable.rs -------------------------------------------------------------------------------- Ir -- line 44 ---------------------------------------- . /// Convert from a specific kind of undo to the more general UndoLog . impl<'tcx> From for UndoLog<'tcx> { . fn from(l: Instantiate) -> Self { . UndoLog::Values(sv::UndoLog::Other(l)) . } . } . . impl<'tcx> Rollback> for TypeVariableStorage<'tcx> { 104,275 ( 0.00%) fn reverse(&mut self, undo: UndoLog<'tcx>) { 439,711 ( 0.00%) match undo { 81,664 ( 0.00%) UndoLog::EqRelation(undo) => self.eq_relations.reverse(undo), 47,166 ( 0.00%) UndoLog::SubRelation(undo) => self.sub_relations.reverse(undo), 79,720 ( 0.00%) UndoLog::Values(undo) => self.values.reverse(undo), . } 208,550 ( 0.00%) } . } . . pub struct TypeVariableStorage<'tcx> { . values: sv::SnapshotVecStorage, . . /// Two variables are unified in `eq_relations` when we have a . /// constraint `?X == ?Y`. This table also stores, for each key, . /// the known value. -- line 66 ---------------------------------------- -- line 136 ---------------------------------------- . DynReturnFn, . LatticeVariable, . } . . pub(crate) struct TypeVariableData { . origin: TypeVariableOrigin, . } . 1,416,232 ( 0.01%) #[derive(Copy, Clone, Debug)] . pub enum TypeVariableValue<'tcx> { . Known { value: Ty<'tcx> }, . Unknown { universe: ty::UniverseIndex }, . } . . impl<'tcx> TypeVariableValue<'tcx> { . /// If this value is known, returns the type it is known to be. . /// Otherwise, `None`. . pub fn known(&self) -> Option> { 922,362 ( 0.01%) match *self { . TypeVariableValue::Unknown { .. } => None, . TypeVariableValue::Known { value } => Some(value), . } . } . . pub fn is_unknown(&self) -> bool { . match *self { . TypeVariableValue::Unknown { .. } => true, -- line 162 ---------------------------------------- -- line 166 ---------------------------------------- . } . . pub(crate) struct Instantiate; . . pub(crate) struct Delegate; . . impl<'tcx> TypeVariableStorage<'tcx> { . pub fn new() -> TypeVariableStorage<'tcx> { 97,545 ( 0.00%) TypeVariableStorage { . values: sv::SnapshotVecStorage::new(), . eq_relations: ut::UnificationTableStorage::new(), . sub_relations: ut::UnificationTableStorage::new(), . } . } . . #[inline] . pub(crate) fn with_log<'a>( -- line 182 ---------------------------------------- -- line 188 ---------------------------------------- . } . . impl<'tcx> TypeVariableTable<'_, 'tcx> { . /// Returns the origin that was given when `vid` was created. . /// . /// Note that this function does not return care whether . /// `vid` has been unified with something else or not. . pub fn var_origin(&self, vid: ty::TyVid) -> &TypeVariableOrigin { 1,610 ( 0.00%) &self.storage.values.get(vid.as_usize()).origin . } . . /// Records that `a == b`, depending on `dir`. . /// . /// Precondition: neither `a` nor `b` are known. . pub fn equate(&mut self, a: ty::TyVid, b: ty::TyVid) { . debug_assert!(self.probe(a).is_unknown()); . debug_assert!(self.probe(b).is_unknown()); 40,453 ( 0.00%) self.eq_relations().union(a, b); 34,674 ( 0.00%) self.sub_relations().union(a, b); . } . . /// Records that `a <: b`, depending on `dir`. . /// . /// Precondition: neither `a` nor `b` are known. . pub fn sub(&mut self, a: ty::TyVid, b: ty::TyVid) { . debug_assert!(self.probe(a).is_unknown()); . debug_assert!(self.probe(b).is_unknown()); 4,449 ( 0.00%) self.sub_relations().union(a, b); . } . . /// Instantiates `vid` with the type `ty`. . /// . /// Precondition: `vid` must not have been previously instantiated. 246,780 ( 0.00%) pub fn instantiate(&mut self, vid: ty::TyVid, ty: Ty<'tcx>) { . let vid = self.root_var(vid); . debug_assert!(self.probe(vid).is_unknown()); . debug_assert!( . self.eq_relations().probe_value(vid).is_unknown(), . "instantiating type variable `{:?}` twice: new-value = {:?}, old-value={:?}", . vid, . ty, . self.eq_relations().probe_value(vid) . ); 345,492 ( 0.00%) self.eq_relations().union_value(vid, TypeVariableValue::Known { value: ty }); . . // Hack: we only need this so that `types_escaping_snapshot` . // can see what has been unified; see the Delegate impl for . // more details. . self.undo_log.push(Instantiate); 246,780 ( 0.00%) } . . /// Creates a new type variable. . /// . /// - `diverging`: indicates if this is a "diverging" type . /// variable, e.g., one created as the type of a `return` . /// expression. The code in this module doesn't care if a . /// variable is diverging, but the main Rust type-checker will . /// sometimes "unify" such variables with the `!` or `()` types. . /// - `origin`: indicates *why* the type variable was created. . /// The code in this module doesn't care, but it can be useful . /// for improving error messages. 357,282 ( 0.00%) pub fn new_var( . &mut self, . universe: ty::UniverseIndex, . origin: TypeVariableOrigin, . ) -> ty::TyVid { 535,923 ( 0.00%) let eq_key = self.eq_relations().new_key(TypeVariableValue::Unknown { universe }); . 297,735 ( 0.00%) let sub_key = self.sub_relations().new_key(()); 59,547 ( 0.00%) assert_eq!(eq_key.vid, sub_key); . 535,923 ( 0.00%) let index = self.values().push(TypeVariableData { origin }); 238,188 ( 0.00%) assert_eq!(eq_key.vid.as_u32(), index as u32); . . debug!("new_var(index={:?}, universe={:?}, origin={:?}", eq_key.vid, universe, origin,); . . eq_key.vid 416,829 ( 0.00%) } . . /// Returns the number of type variables created thus far. . pub fn num_vars(&self) -> usize { 2,467 ( 0.00%) self.storage.values.len() . } . . /// Returns the "root" variable of `vid` in the `eq_relations` . /// equivalence table. All type variables that have been equated . /// will yield the same root variable (per the union-find . /// algorithm), so `root_var(a) == root_var(b)` implies that `a == . /// b` (transitively). . pub fn root_var(&mut self, vid: ty::TyVid) -> ty::TyVid { 196,254 ( 0.00%) self.eq_relations().find(vid).vid . } . . /// Returns the "root" variable of `vid` in the `sub_relations` . /// equivalence table. All type variables that have been are . /// related via equality or subtyping will yield the same root . /// variable (per the union-find algorithm), so `sub_root_var(a) . /// == sub_root_var(b)` implies that: . /// . /// exists X. (a <: X || X <: a) && (b <: X || X <: b) 487 ( 0.00%) pub fn sub_root_var(&mut self, vid: ty::TyVid) -> ty::TyVid { 152,181 ( 0.00%) self.sub_relations().find(vid) 974 ( 0.00%) } . . /// Returns `true` if `a` and `b` have same "sub-root" (i.e., exists some . /// type X such that `forall i in {a, b}. (i <: X || X <: i)`. . pub fn sub_unified(&mut self, a: ty::TyVid, b: ty::TyVid) -> bool { . self.sub_root_var(a) == self.sub_root_var(b) . } . . /// Retrieves the type to which `vid` has been instantiated, if . /// any. 3,238,445 ( 0.02%) pub fn probe(&mut self, vid: ty::TyVid) -> TypeVariableValue<'tcx> { . self.inlined_probe(vid) 3,238,445 ( 0.02%) } . . /// An always-inlined variant of `probe`, for very hot call sites. . #[inline(always)] . pub fn inlined_probe(&mut self, vid: ty::TyVid) -> TypeVariableValue<'tcx> { 7,575,370 ( 0.05%) self.eq_relations().inlined_probe_value(vid) . } . . /// If `t` is a type-inference variable, and it has been . /// instantiated, then return the with which it was . /// instantiated. Otherwise, returns `t`. . pub fn replace_if_possible(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { 667,802 ( 0.00%) match *t.kind() { 428,258 ( 0.00%) ty::Infer(ty::TyVar(v)) => match self.probe(v) { . TypeVariableValue::Unknown { .. } => t, . TypeVariableValue::Known { value } => value, . }, . _ => t, . } . } . . #[inline] -- line 323 ---------------------------------------- -- line 324 ---------------------------------------- . fn values( . &mut self, . ) -> sv::SnapshotVec, &mut InferCtxtUndoLogs<'tcx>> { . self.storage.values.with_log(self.undo_log) . } . . #[inline] . fn eq_relations(&mut self) -> super::UnificationTable<'_, 'tcx, TyVidEqKey<'tcx>> { 5,431,613 ( 0.04%) self.storage.eq_relations.with_log(self.undo_log) . } . . #[inline] . fn sub_relations(&mut self) -> super::UnificationTable<'_, 'tcx, ty::TyVid> { 118,841 ( 0.00%) self.storage.sub_relations.with_log(self.undo_log) . } . . /// Returns a range of the type variables created during the snapshot. 12,335 ( 0.00%) pub fn vars_since_snapshot( . &mut self, . value_count: usize, . ) -> (Range, Vec) { . let range = TyVid::from_usize(value_count)..TyVid::from_usize(self.num_vars()); 14,802 ( 0.00%) ( . range.start..range.end, . (range.start.as_usize()..range.end.as_usize()) . .map(|index| self.storage.values.get(index).origin) . .collect(), . ) 14,802 ( 0.00%) } . . /// Returns indices of all variables that are not yet . /// instantiated. . pub fn unsolved_variables(&mut self) -> Vec { . (0..self.storage.values.len()) . .filter_map(|i| { . let vid = ty::TyVid::from_usize(i); 244,504 ( 0.00%) match self.probe(vid) { . TypeVariableValue::Unknown { .. } => Some(vid), . TypeVariableValue::Known { .. } => None, . } . }) . .collect() . } . } . -- line 368 ---------------------------------------- -- line 391 ---------------------------------------- . /// These structs (a newtyped TyVid) are used as the unification key . /// for the `eq_relations`; they carry a `TypeVariableValue` along . /// with them. . #[derive(Copy, Clone, Debug, PartialEq, Eq)] . pub(crate) struct TyVidEqKey<'tcx> { . vid: ty::TyVid, . . // in the table, we map each ty-vid to one of these: 10,408,959 ( 0.07%) phantom: PhantomData>, . } . . impl<'tcx> From for TyVidEqKey<'tcx> { . #[inline] // make this function eligible for inlining - it is quite hot. . fn from(vid: ty::TyVid) -> Self { . TyVidEqKey { vid, phantom: PhantomData } . } . } -- line 407 ---------------------------------------- -- line 419 ---------------------------------------- . "TyVidEqKey" . } . } . . impl<'tcx> ut::UnifyValue for TypeVariableValue<'tcx> { . type Error = ut::NoError; . . fn unify_values(value1: &Self, value2: &Self) -> Result { 226,319 ( 0.00%) match (value1, value2) { . // We never equate two type variables, both of which . // have known types. Instead, we recursively equate . // those types. . (&TypeVariableValue::Known { .. }, &TypeVariableValue::Known { .. }) => { . bug!("equating two type variables, both of which have known types") . } . . // If one side is known, prefer that one. . (&TypeVariableValue::Known { .. }, &TypeVariableValue::Unknown { .. }) => Ok(*value1), . (&TypeVariableValue::Unknown { .. }, &TypeVariableValue::Known { .. }) => Ok(*value2), . . // If both sides are *unknown*, it hardly matters, does it? . ( 5,779 ( 0.00%) &TypeVariableValue::Unknown { universe: universe1 }, 5,779 ( 0.00%) &TypeVariableValue::Unknown { universe: universe2 }, . ) => { . // If we unify two unbound variables, ?T and ?U, then whatever . // value they wind up taking (which must be the same value) must . // be nameable by both universes. Therefore, the resulting . // universe is the minimum of the two universes, because that is . // the one which contains the fewest names in scope. . let universe = cmp::min(universe1, universe2); 23,116 ( 0.00%) Ok(TypeVariableValue::Unknown { universe }) . } . } . } . } 127,125 ( 0.00%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/library/core/src/slice/mod.rs -------------------------------------------------------------------------------- Ir -- line 141 ---------------------------------------- . /// ``` . /// let a = [1, 2, 3]; . /// assert!(!a.is_empty()); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_slice_is_empty", since = "1.39.0")] . #[inline] . pub const fn is_empty(&self) -> bool { 1,534,600 ( 0.01%) self.len() == 0 . } . . /// Returns the first element of the slice, or `None` if it is empty. . /// . /// # Examples . /// . /// ``` . /// let v = [10, 40, 30]; -- line 157 ---------------------------------------- -- line 159 ---------------------------------------- . /// . /// let w: &[i32] = &[]; . /// assert_eq!(None, w.first()); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_slice_first_last_not_mut", since = "1.56.0")] . #[inline] . pub const fn first(&self) -> Option<&T> { 13,538 ( 0.00%) if let [first, ..] = self { Some(first) } else { None } . } . . /// Returns a mutable pointer to the first element of the slice, or `None` if it is empty. . /// . /// # Examples . /// . /// ``` . /// let x = &mut [0, 1, 2]; -- line 175 ---------------------------------------- -- line 178 ---------------------------------------- . /// *first = 5; . /// } . /// assert_eq!(x, &[5, 1, 2]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_slice_first_last", issue = "83570")] . #[inline] . pub const fn first_mut(&mut self) -> Option<&mut T> { 1,616 ( 0.00%) if let [first, ..] = self { Some(first) } else { None } . } . . /// Returns the first and all the rest of the elements of the slice, or `None` if it is empty. . /// . /// # Examples . /// . /// ``` . /// let x = &[0, 1, 2]; -- line 194 ---------------------------------------- -- line 197 ---------------------------------------- . /// assert_eq!(first, &0); . /// assert_eq!(elements, &[1, 2]); . /// } . /// ``` . #[stable(feature = "slice_splits", since = "1.5.0")] . #[rustc_const_stable(feature = "const_slice_first_last_not_mut", since = "1.56.0")] . #[inline] . pub const fn split_first(&self) -> Option<(&T, &[T])> { 24 ( 0.00%) if let [first, tail @ ..] = self { Some((first, tail)) } else { None } . } . . /// Returns the first and all the rest of the elements of the slice, or `None` if it is empty. . /// . /// # Examples . /// . /// ``` . /// let x = &mut [0, 1, 2]; -- line 213 ---------------------------------------- -- line 237 ---------------------------------------- . /// assert_eq!(last, &2); . /// assert_eq!(elements, &[0, 1]); . /// } . /// ``` . #[stable(feature = "slice_splits", since = "1.5.0")] . #[rustc_const_stable(feature = "const_slice_first_last_not_mut", since = "1.56.0")] . #[inline] . pub const fn split_last(&self) -> Option<(&T, &[T])> { 34,440 ( 0.00%) if let [init @ .., last] = self { Some((last, init)) } else { None } . } . . /// Returns the last and all the rest of the elements of the slice, or `None` if it is empty. . /// . /// # Examples . /// . /// ``` . /// let x = &mut [0, 1, 2]; -- line 253 ---------------------------------------- -- line 276 ---------------------------------------- . /// . /// let w: &[i32] = &[]; . /// assert_eq!(None, w.last()); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_slice_first_last_not_mut", since = "1.56.0")] . #[inline] . pub const fn last(&self) -> Option<&T> { 774,082 ( 0.01%) if let [.., last] = self { Some(last) } else { None } . } . . /// Returns a mutable pointer to the last item in the slice. . /// . /// # Examples . /// . /// ``` . /// let x = &mut [0, 1, 2]; -- line 292 ---------------------------------------- -- line 295 ---------------------------------------- . /// *last = 10; . /// } . /// assert_eq!(x, &[0, 1, 10]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_slice_first_last", issue = "83570")] . #[inline] . pub const fn last_mut(&mut self) -> Option<&mut T> { 1,362,651 ( 0.01%) if let [.., last] = self { Some(last) } else { None } . } . . /// Returns a reference to an element or subslice depending on the type of . /// index. . /// . /// - If given a position, returns a reference to the element at that . /// position or `None` if out of bounds. . /// - If given a range, returns the subslice corresponding to that range, -- line 311 ---------------------------------------- -- line 448 ---------------------------------------- . /// } . /// ``` . /// . /// [`as_mut_ptr`]: slice::as_mut_ptr . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_slice_as_ptr", since = "1.32.0")] . #[inline] . pub const fn as_ptr(&self) -> *const T { 1,885,892 ( 0.01%) self as *const [T] as *const T . } . . /// Returns an unsafe mutable pointer to the slice's buffer. . /// . /// The caller must ensure that the slice outlives the pointer this . /// function returns, or else it will end up pointing to garbage. . /// . /// Modifying the container referenced by this slice may cause its buffer -- line 464 ---------------------------------------- -- line 476 ---------------------------------------- . /// } . /// } . /// assert_eq!(x, &[3, 4, 6]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")] . #[inline] . pub const fn as_mut_ptr(&mut self) -> *mut T { 4 ( 0.00%) self as *mut [T] as *mut T . } . . /// Returns the two raw pointers spanning the slice. . /// . /// The returned range is half-open, which means that the end pointer . /// points *one past* the last element of the slice. This way, an empty . /// slice is represented by two equal pointers, and the difference between . /// the two pointers represents the size of the slice. -- line 492 ---------------------------------------- -- line 556 ---------------------------------------- . /// [`as_mut_ptr`]: slice::as_mut_ptr . #[stable(feature = "slice_ptr_range", since = "1.48.0")] . #[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")] . #[inline] . pub const fn as_mut_ptr_range(&mut self) -> Range<*mut T> { . let start = self.as_mut_ptr(); . // SAFETY: See as_ptr_range() above for why `add` here is safe. . let end = unsafe { start.add(self.len()) }; 1 ( 0.00%) start..end . } . . /// Swaps two elements in the slice. . /// . /// # Arguments . /// . /// * a - The index of the first element . /// * b - The index of the second element -- line 572 ---------------------------------------- -- line 582 ---------------------------------------- . /// v.swap(2, 4); . /// assert!(v == ["a", "b", "e", "d", "c"]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_unstable(feature = "const_swap", issue = "83163")] . #[inline] . #[track_caller] . pub const fn swap(&mut self, a: usize, b: usize) { 57,422 ( 0.00%) let _ = &self[a]; 629,405 ( 0.00%) let _ = &self[b]; . . // SAFETY: we just checked that both `a` and `b` are in bounds . unsafe { self.swap_unchecked(a, b) } . } . . /// Swaps two elements in the slice, without doing bounds checking. . /// . /// For a safe alternative see [`swap`]. -- line 599 ---------------------------------------- -- line 644 ---------------------------------------- . /// ``` . /// let mut v = [1, 2, 3]; . /// v.reverse(); . /// assert!(v == [3, 2, 1]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . pub fn reverse(&mut self) { 2 ( 0.00%) let half_len = self.len() / 2; . let Range { start, end } = self.as_mut_ptr_range(); . . // These slices will skip the middle item for an odd length, . // since that one doesn't need to move. . let (front_half, back_half) = . // SAFETY: Both are subparts of the original slice, so the memory . // range is valid, and they don't overlap because they're each only . // half (or less) of the original slice. -- line 660 ---------------------------------------- -- line 677 ---------------------------------------- . . // Because this function is first compiled in isolation, . // this check tells LLVM that the indexing below is . // in-bounds. Then after inlining -- once the actual . // lengths of the slices are known -- it's removed. . let (a, b) = (&mut a[..n], &mut b[..n]); . . for i in 0..n { 2,893 ( 0.00%) mem::swap(&mut a[i], &mut b[n - 1 - i]); . } . } . } . . /// Returns an iterator over the slice. . /// . /// # Examples . /// -- line 693 ---------------------------------------- -- line 1499 ---------------------------------------- . /// assert_eq!(left, [1, 2, 3, 4, 5, 6]); . /// assert_eq!(right, []); . /// } . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . #[track_caller] . pub fn split_at(&self, mid: usize) -> (&[T], &[T]) { 348 ( 0.00%) assert!(mid <= self.len()); . // SAFETY: `[ptr; mid]` and `[mid; len]` are inside `self`, which . // fulfills the requirements of `from_raw_parts_mut`. . unsafe { self.split_at_unchecked(mid) } . } . . /// Divides one mutable slice into two at an index. . /// . /// The first will contain all indices from `[0, mid)` (excluding -- line 1515 ---------------------------------------- -- line 1530 ---------------------------------------- . /// left[1] = 2; . /// right[1] = 4; . /// assert_eq!(v, [1, 2, 3, 4, 5, 6]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . #[track_caller] . pub fn split_at_mut(&mut self, mid: usize) -> (&mut [T], &mut [T]) { 119,594 ( 0.00%) assert!(mid <= self.len()); . // SAFETY: `[ptr; mid]` and `[mid; len]` are inside `self`, which . // fulfills the requirements of `from_raw_parts_mut`. . unsafe { self.split_at_mut_unchecked(mid) } . } . . /// Divides one slice into two at an index, without doing bounds checking. . /// . /// The first will contain all indices from `[0, mid)` (excluding -- line 1546 ---------------------------------------- -- line 1628 ---------------------------------------- . pub unsafe fn split_at_mut_unchecked(&mut self, mid: usize) -> (&mut [T], &mut [T]) { . let len = self.len(); . let ptr = self.as_mut_ptr(); . . // SAFETY: Caller has to check that `0 <= mid <= self.len()`. . // . // `[ptr; mid]` and `[mid; len]` are not overlapping, so returning a mutable reference . // is fine. 27,225 ( 0.00%) unsafe { (from_raw_parts_mut(ptr, mid), from_raw_parts_mut(ptr.add(mid), len - mid)) } . } . . /// Divides one slice into an array and a remainder slice at an index. . /// . /// The array will contain all indices from `[0, N)` (excluding . /// the index `N` itself) and the slice will contain all . /// indices from `[N, len)` (excluding the index `len` itself). . /// -- line 1644 ---------------------------------------- -- line 2113 ---------------------------------------- . /// assert!(!v.iter().any(|e| e == "hi")); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[inline] . pub fn contains(&self, x: &T) -> bool . where . T: PartialEq, . { 1,964 ( 0.00%) cmp::SliceContains::slice_contains(x, self) . } . . /// Returns `true` if `needle` is a prefix of the slice. . /// . /// # Examples . /// . /// ``` . /// let v = [10, 40, 30]; -- line 2129 ---------------------------------------- -- line 2142 ---------------------------------------- . /// assert!(v.starts_with(&[])); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . pub fn starts_with(&self, needle: &[T]) -> bool . where . T: PartialEq, . { . let n = needle.len(); 34,727 ( 0.00%) self.len() >= n && needle == &self[..n] . } . . /// Returns `true` if `needle` is a suffix of the slice. . /// . /// # Examples . /// . /// ``` . /// let v = [10, 40, 30]; -- line 2158 ---------------------------------------- -- line 2171 ---------------------------------------- . /// assert!(v.ends_with(&[])); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . pub fn ends_with(&self, needle: &[T]) -> bool . where . T: PartialEq, . { . let (m, n) = (self.len(), needle.len()); 30,129 ( 0.00%) m >= n && needle == &self[m - n..] . } . . /// Returns a subslice with the prefix removed. . /// . /// If the slice starts with `prefix`, returns the subslice after the prefix, wrapped in `Some`. . /// If `prefix` is empty, simply returns the original slice. . /// . /// If the slice does not start with `prefix`, returns `None`. -- line 2187 ---------------------------------------- -- line 2293 ---------------------------------------- . /// s.insert(idx, num); . /// assert_eq!(s, [0, 1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 34, 42, 55]); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . pub fn binary_search(&self, x: &T) -> Result . where . T: Ord, . { 3 ( 0.00%) self.binary_search_by(|p| p.cmp(x)) . } . . /// Binary searches this sorted slice with a comparator function. . /// . /// The comparator function should implement an order consistent . /// with the sort order of the underlying slice, returning an . /// order code that indicates whether its argument is `Less`, . /// `Equal` or `Greater` the desired target. -- line 2309 ---------------------------------------- -- line 2345 ---------------------------------------- . #[inline] . pub fn binary_search_by<'a, F>(&'a self, mut f: F) -> Result . where . F: FnMut(&'a T) -> Ordering, . { . let mut size = self.len(); . let mut left = 0; . let mut right = size; 8,842,586 ( 0.06%) while left < right { 12,702,006 ( 0.08%) let mid = left + size / 2; . . // SAFETY: the call is made safe by the following invariants: . // - `mid >= 0` . // - `mid < size`: `mid` is limited by `[left; right)` bound. 1,112,818 ( 0.01%) let cmp = f(unsafe { self.get_unchecked(mid) }); . . // The reason why we use if/else control flow rather than match . // is because match reorders comparison operations, which is perf sensitive. . // This is x86 asm for u8: https://rust.godbolt.org/z/8Y8Pra. 3,516,176 ( 0.02%) if cmp == Less { 6,893,222 ( 0.05%) left = mid + 1; 1,708,447 ( 0.01%) } else if cmp == Greater { . right = mid; . } else { . // SAFETY: same as the `get_unchecked` above . unsafe { crate::intrinsics::assume(mid < self.len()) }; . return Ok(mid); . } . 10,120,490 ( 0.07%) size = right - left; . } . Err(left) . } . . /// Binary searches this sorted slice with a key extraction function. . /// . /// Assumes that the slice is sorted by the key, for instance with . /// [`sort_by_key`] using the same key extraction function. -- line 2382 ---------------------------------------- -- line 3203 ---------------------------------------- . #[track_caller] . fn len_mismatch_fail(dst_len: usize, src_len: usize) -> ! { . panic!( . "source slice length ({}) does not match destination slice length ({})", . src_len, dst_len, . ); . } . 268,748 ( 0.00%) if self.len() != src.len() { . len_mismatch_fail(self.len(), src.len()); . } . . // SAFETY: `self` is valid for `self.len()` elements by definition, and `src` was . // checked to have the same length. The slices cannot overlap because . // mutable references are exclusive. . unsafe { . ptr::copy_nonoverlapping(src.as_ptr(), self.as_mut_ptr(), self.len()); -- line 3219 ---------------------------------------- -- line 3380 ---------------------------------------- . } . a << k . } . let gcd: usize = gcd(mem::size_of::(), mem::size_of::()); . let ts: usize = mem::size_of::() / gcd; . let us: usize = mem::size_of::() / gcd; . . // Armed with this knowledge, we can find how many `U`s we can fit! 4 ( 0.00%) let us_len = self.len() / ts * us; . // And how many `T`s will be in the trailing slice! 75,306 ( 0.00%) let ts_len = self.len() % ts; . (us_len, ts_len) . } . . /// Transmute the slice to a slice of another type, ensuring alignment of the types is . /// maintained. . /// . /// This method splits the slice into three distinct slices: prefix, correctly aligned middle . /// slice of a new type, and the suffix slice. The method may make the middle slice the greatest -- line 3398 ---------------------------------------- -- line 3429 ---------------------------------------- . return (self, &[], &[]); . } . . // First, find at what point do we split between the first and 2nd slice. Easy with . // ptr.align_offset. . let ptr = self.as_ptr(); . // SAFETY: See the `align_to_mut` method for the detailed safety comment. . let offset = unsafe { crate::ptr::align_offset(ptr, mem::align_of::()) }; 75,306 ( 0.00%) if offset > self.len() { . (self, &[], &[]) . } else { . let (left, rest) = self.split_at(offset); . let (us_len, ts_len) = rest.align_to_offsets::(); . // SAFETY: now `rest` is definitely aligned, so `from_raw_parts` below is okay, . // since the caller guarantees that we can transmute `T` to `U` safely. . unsafe { . ( . left, . from_raw_parts(rest.as_ptr() as *const U, us_len), 75,310 ( 0.00%) from_raw_parts(rest.as_ptr().add(rest.len() - ts_len), ts_len), . ) . } . } . } . . /// Transmute the slice to a slice of another type, ensuring alignment of the types is . /// maintained. . /// -- line 3456 ---------------------------------------- -- line 3731 ---------------------------------------- . /// let v = [1, 2, 3, 3, 5, 6, 7]; . /// let i = v.partition_point(|&x| x < 5); . /// . /// assert_eq!(i, 4); . /// assert!(v[..i].iter().all(|&x| x < 5)); . /// assert!(v[i..].iter().all(|&x| !(x < 5))); . /// ``` . #[stable(feature = "partition_point", since = "1.52.0")] 8 ( 0.00%) pub fn partition_point

(&self, mut pred: P) -> usize . where . P: FnMut(&T) -> bool, . { . self.binary_search_by(|x| if pred(x) { Less } else { Greater }).unwrap_or_else(|i| i) 16 ( 0.00%) } . . /// Removes the subslice corresponding to the given range . /// and returns a reference to it. . /// . /// Returns `None` and does not modify the slice if the given . /// range is out of bounds. . /// . /// Note that this method only accepts one-sided ranges such as -- line 3752 ---------------------------------------- 7,898,137 ( 0.05%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/rust/worktree-benchmarking/library/core/src/num/uint_macros.rs -------------------------------------------------------------------------------- Ir -- line 57 ---------------------------------------- . /// # Examples . /// . /// Basic usage: . /// . /// ``` . #[doc = concat!("assert_eq!(", stringify!($SelfT), "::from_str_radix(\"A\", 16), Ok(10));")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] 3,272 ( 0.00%) pub fn from_str_radix(src: &str, radix: u32) -> Result { 1,636 ( 0.00%) from_str_radix(src, radix) 4,908 ( 0.00%) } . . /// Returns the number of ones in the binary representation of `self`. . /// . /// # Examples . /// . /// Basic usage: . /// . /// ``` -- line 75 ---------------------------------------- -- line 80 ---------------------------------------- . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_math", since = "1.32.0")] . #[doc(alias = "popcount")] . #[doc(alias = "popcnt")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn count_ones(self) -> u32 { 626,700 ( 0.00%) intrinsics::ctpop(self as $ActualT) as u32 . } . . /// Returns the number of zeros in the binary representation of `self`. . /// . /// # Examples . /// . /// Basic usage: . /// -- line 96 ---------------------------------------- -- line 118 ---------------------------------------- . /// assert_eq!(n.leading_zeros(), 2); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn leading_zeros(self) -> u32 { 1,137,014 ( 0.01%) intrinsics::ctlz(self as $ActualT) as u32 . } . . /// Returns the number of trailing zeros in the binary representation . /// of `self`. . /// . /// # Examples . /// . /// Basic usage: -- line 134 ---------------------------------------- -- line 139 ---------------------------------------- . /// assert_eq!(n.trailing_zeros(), 3); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn trailing_zeros(self) -> u32 { 984,744 ( 0.01%) intrinsics::cttz(self) as u32 . } . . /// Returns the number of leading ones in the binary representation of `self`. . /// . /// # Examples . /// . /// Basic usage: . /// -- line 155 ---------------------------------------- -- line 204 ---------------------------------------- . #[doc = concat!("assert_eq!(n.rotate_left(", $rot, "), m);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn rotate_left(self, n: u32) -> Self { 25,942,958 ( 0.17%) intrinsics::rotate_left(self, n as $SelfT) . } . . /// Shifts the bits to the right by a specified amount, `n`, . /// wrapping the truncated bits to the beginning of the resulting . /// integer. . /// . /// Please note this isn't the same operation as the `>>` shifting operator! . /// -- line 220 ---------------------------------------- -- line 430 ---------------------------------------- . #[doc = concat!("assert_eq!((", stringify!($SelfT), "::MAX - 2).checked_add(3), None);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_checked_int_methods", since = "1.47.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline] . pub const fn checked_add(self, rhs: Self) -> Option { 64 ( 0.00%) let (a, b) = self.overflowing_add(rhs); . if unlikely!(b) {None} else {Some(a)} . } . . /// Unchecked integer addition. Computes `self + rhs`, assuming overflow . /// cannot occur. . /// . /// # Safety . /// -- line 446 ---------------------------------------- -- line 456 ---------------------------------------- . )] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")] . #[inline(always)] . pub const unsafe fn unchecked_add(self, rhs: Self) -> Self { . // SAFETY: the caller must uphold the safety contract for . // `unchecked_add`. 3,219,555 ( 0.02%) unsafe { intrinsics::unchecked_add(self, rhs) } . } . . /// Checked addition with a signed integer. Computes `self + rhs`, . /// returning `None` if overflow occurred. . /// . /// # Examples . /// . /// Basic usage: -- line 472 ---------------------------------------- -- line 525 ---------------------------------------- . )] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")] . #[inline(always)] . pub const unsafe fn unchecked_sub(self, rhs: Self) -> Self { . // SAFETY: the caller must uphold the safety contract for . // `unchecked_sub`. 218,777 ( 0.00%) unsafe { intrinsics::unchecked_sub(self, rhs) } . } . . /// Checked integer multiplication. Computes `self * rhs`, returning . /// `None` if overflow occurred. . /// . /// # Examples . /// . /// Basic usage: -- line 541 ---------------------------------------- -- line 596 ---------------------------------------- . without modifying the original"] . #[inline] . pub const fn checked_div(self, rhs: Self) -> Option { . if unlikely!(rhs == 0) { . None . } else { . // SAFETY: div by zero has been checked above and unsigned types have no other . // failure modes for division 856 ( 0.00%) Some(unsafe { intrinsics::unchecked_div(self, rhs) }) . } . } . . /// Checked Euclidean division. Computes `self.div_euclid(rhs)`, returning `None` . /// if `rhs == 0`. . /// . /// # Examples . /// -- line 612 ---------------------------------------- -- line 1035 ---------------------------------------- . #[doc = concat!("assert_eq!(", stringify!($SelfT), "::MAX.saturating_add(127), ", stringify!($SelfT), "::MAX);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[rustc_const_stable(feature = "const_saturating_int_methods", since = "1.47.0")] . #[inline(always)] . pub const fn saturating_add(self, rhs: Self) -> Self { 568,049 ( 0.00%) intrinsics::saturating_add(self, rhs) . } . . /// Saturating addition with a signed integer. Computes `self + rhs`, . /// saturating at the numeric bounds instead of overflowing. . /// . /// # Examples . /// . /// Basic usage: -- line 1051 ---------------------------------------- -- line 1084 ---------------------------------------- . #[doc = concat!("assert_eq!(13", stringify!($SelfT), ".saturating_sub(127), 0);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[rustc_const_stable(feature = "const_saturating_int_methods", since = "1.47.0")] . #[inline(always)] . pub const fn saturating_sub(self, rhs: Self) -> Self { 37,547 ( 0.00%) intrinsics::saturating_sub(self, rhs) . } . . /// Saturating integer multiplication. Computes `self * rhs`, . /// saturating at the numeric bounds instead of overflowing. . /// . /// # Examples . /// . /// Basic usage: -- line 1100 ---------------------------------------- -- line 1175 ---------------------------------------- . #[doc = concat!("assert_eq!(200", stringify!($SelfT), ".wrapping_add(", stringify!($SelfT), "::MAX), 199);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn wrapping_add(self, rhs: Self) -> Self { 12,113,404 ( 0.08%) intrinsics::wrapping_add(self, rhs) . } . . /// Wrapping (modular) addition with a signed integer. Computes . /// `self + rhs`, wrapping around at the boundary of the type. . /// . /// # Examples . /// . /// Basic usage: -- line 1191 ---------------------------------------- -- line 1217 ---------------------------------------- . #[doc = concat!("assert_eq!(100", stringify!($SelfT), ".wrapping_sub(", stringify!($SelfT), "::MAX), 101);")] . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn wrapping_sub(self, rhs: Self) -> Self { 4,226,538 ( 0.03%) intrinsics::wrapping_sub(self, rhs) . } . . /// Wrapping (modular) multiplication. Computes `self * . /// rhs`, wrapping around at the boundary of the type. . /// . /// # Examples . /// . /// Basic usage: -- line 1233 ---------------------------------------- -- line 1240 ---------------------------------------- . /// assert_eq!(25u8.wrapping_mul(12), 44); . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn wrapping_mul(self, rhs: Self) -> Self { 16,910,553 ( 0.11%) intrinsics::wrapping_mul(self, rhs) . } . . /// Wrapping (modular) division. Computes `self / rhs`. . /// Wrapped division on unsigned types is just normal division. . /// There's no way wrapping could ever happen. . /// This function exists, so that all operations . /// are accounted for in the wrapping operations. . /// -- line 1256 ---------------------------------------- -- line 1397 ---------------------------------------- . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn wrapping_shl(self, rhs: u32) -> Self { . // SAFETY: the masking by the bitsize of the type ensures that we do not shift . // out of bounds . unsafe { 35 ( 0.00%) intrinsics::unchecked_shl(self, (rhs & ($BITS - 1)) as $SelfT) . } . } . . /// Panic-free bitwise shift-right; yields `self >> mask(rhs)`, . /// where `mask` removes any high-order bits of `rhs` that . /// would cause the shift to exceed the bitwidth of the type. . /// . /// Note that this is *not* the same as a rotate-right; the -- line 1413 ---------------------------------------- -- line 1429 ---------------------------------------- . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn wrapping_shr(self, rhs: u32) -> Self { . // SAFETY: the masking by the bitsize of the type ensures that we do not shift . // out of bounds . unsafe { 48 ( 0.00%) intrinsics::unchecked_shr(self, (rhs & ($BITS - 1)) as $SelfT) . } . } . . /// Wrapping (modular) exponentiation. Computes `self.pow(exp)`, . /// wrapping around at the boundary of the type. . /// . /// # Examples . /// -- line 1445 ---------------------------------------- -- line 1491 ---------------------------------------- . #[doc = concat!("assert_eq!(5", stringify!($SelfT), ".overflowing_add(2), (7, false));")] . #[doc = concat!("assert_eq!(", stringify!($SelfT), "::MAX.overflowing_add(1), (0, true));")] . /// ``` . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] 783 ( 0.00%) pub const fn overflowing_add(self, rhs: Self) -> (Self, bool) { 2,055,988 ( 0.01%) let (a, b) = intrinsics::add_with_overflow(self as $ActualT, rhs as $ActualT); . (a as Self, b) 1,566 ( 0.00%) } . . /// Calculates `self + rhs + carry` without the ability to overflow. . /// . /// Performs "ternary addition" which takes in an extra bit to add, and may return an . /// additional bit of overflow. This allows for chaining together multiple additions . /// to create "big integers" which represent larger values. . /// . #[doc = concat!("This can be thought of as a ", stringify!($BITS), "-bit \"full adder\", in the electronics sense.")] -- line 1510 ---------------------------------------- -- line 1587 ---------------------------------------- . #[doc = concat!("assert_eq!(5", stringify!($SelfT), ".overflowing_sub(2), (3, false));")] . #[doc = concat!("assert_eq!(0", stringify!($SelfT), ".overflowing_sub(1), (", stringify!($SelfT), "::MAX, true));")] . /// ``` . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] 555 ( 0.00%) pub const fn overflowing_sub(self, rhs: Self) -> (Self, bool) { 551,009 ( 0.00%) let (a, b) = intrinsics::sub_with_overflow(self as $ActualT, rhs as $ActualT); . (a as Self, b) 1,110 ( 0.00%) } . . /// Calculates `self - rhs - borrow` without the ability to overflow. . /// . /// Performs "ternary subtraction" which takes in an extra bit to subtract, and may return . /// an additional bit of overflow. This allows for chaining together multiple subtractions . /// to create "big integers" which represent larger values. . /// . /// # Examples -- line 1606 ---------------------------------------- -- line 1673 ---------------------------------------- . /// assert_eq!(5u32.overflowing_mul(2), (10, false)); . /// assert_eq!(1_000_000_000u32.overflowing_mul(10), (1410065408, true)); . /// ``` . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] 172 ( 0.00%) pub const fn overflowing_mul(self, rhs: Self) -> (Self, bool) { 3,901,424 ( 0.03%) let (a, b) = intrinsics::mul_with_overflow(self as $ActualT, rhs as $ActualT); . (a as Self, b) 86 ( 0.00%) } . . /// Calculates the divisor when `self` is divided by `rhs`. . /// . /// Returns a tuple of the divisor along with a boolean indicating . /// whether an arithmetic overflow would occur. Note that for unsigned . /// integers overflow never occurs, so the second value is always . /// `false`. . /// -- line 1692 ---------------------------------------- -- line 1701 ---------------------------------------- . /// ``` . #[doc = concat!("assert_eq!(5", stringify!($SelfT), ".overflowing_div(2), (2, false));")] . /// ``` . #[inline(always)] . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_overflowing_int_methods", since = "1.52.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] 6 ( 0.00%) pub const fn overflowing_div(self, rhs: Self) -> (Self, bool) { 24 ( 0.00%) (self / rhs, false) 18 ( 0.00%) } . . /// Calculates the quotient of Euclidean division `self.div_euclid(rhs)`. . /// . /// Returns a tuple of the divisor along with a boolean indicating . /// whether an arithmetic overflow would occur. Note that for unsigned . /// integers overflow never occurs, so the second value is always . /// `false`. . /// Since, for the positive integers, all common -- line 1719 ---------------------------------------- -- line 1838 ---------------------------------------- . #[doc = concat!("assert_eq!(0x1", stringify!($SelfT), ".overflowing_shl(132), (0x10, true));")] . /// ``` . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn overflowing_shl(self, rhs: u32) -> (Self, bool) { 9 ( 0.00%) (self.wrapping_shl(rhs), (rhs > ($BITS - 1))) . } . . /// Shifts self right by `rhs` bits. . /// . /// Returns a tuple of the shifted version of self along with a boolean . /// indicating whether the shift value was larger than or equal to the . /// number of bits. If the shift value is too large, then value is . /// masked (N-1) where N is the number of bits, and this value is then -- line 1854 ---------------------------------------- -- line 1863 ---------------------------------------- . #[doc = concat!("assert_eq!(0x10", stringify!($SelfT), ".overflowing_shr(132), (0x1, true));")] . /// ``` . #[stable(feature = "wrapping", since = "1.7.0")] . #[rustc_const_stable(feature = "const_wrapping_math", since = "1.32.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline(always)] . pub const fn overflowing_shr(self, rhs: u32) -> (Self, bool) { 6 ( 0.00%) (self.wrapping_shr(rhs), (rhs > ($BITS - 1))) . } . . /// Raises self to the power of `exp`, using exponentiation by squaring. . /// . /// Returns a tuple of the exponentiation along with a bool indicating . /// whether an overflow happened. . /// . /// # Examples -- line 1879 ---------------------------------------- -- line 2132 ---------------------------------------- . #[doc = concat!("assert!(16", stringify!($SelfT), ".is_power_of_two());")] . #[doc = concat!("assert!(!10", stringify!($SelfT), ".is_power_of_two());")] . /// ``` . #[must_use] . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_is_power_of_two", since = "1.32.0")] . #[inline(always)] . pub const fn is_power_of_two(self) -> bool { 282 ( 0.00%) self.count_ones() == 1 . } . . // Returns one less than next power of two. . // (For 8u8 next power of two is 8u8 and for 6u8 it is 8u8) . // . // 8u8.one_less_than_next_power_of_two() == 7 . // 6u8.one_less_than_next_power_of_two() == 7 . // . // This method cannot overflow, as in the `next_power_of_two` . // overflow cases it instead ends up returning the maximum value . // of the type, and can return 0 for 0. . #[inline] . #[rustc_const_stable(feature = "const_int_pow", since = "1.50.0")] . const fn one_less_than_next_power_of_two(self) -> Self { 12,728 ( 0.00%) if self <= 1 { return 0; } . 41,626 ( 0.00%) let p = self - 1; . // SAFETY: Because `p > 0`, it cannot consist entirely of leading zeros. . // That means the shift is always in-bounds, and some processors . // (such as intel pre-haswell) have more efficient ctlz . // intrinsics when the argument is non-zero. 124,684 ( 0.00%) let z = unsafe { intrinsics::ctlz_nonzero(p) }; 41,660 ( 0.00%) <$SelfT>::MAX >> z . } . . /// Returns the smallest power of two greater than or equal to `self`. . /// . /// When return value overflows (i.e., `self > (1 << (N-1))` for type . /// `uN`), it panics in debug mode and the return value is wrapped to 0 in . /// release mode (the only situation in which method can return 0). . /// -- line 2171 ---------------------------------------- -- line 2179 ---------------------------------------- . /// ``` . #[stable(feature = "rust1", since = "1.0.0")] . #[rustc_const_stable(feature = "const_int_pow", since = "1.50.0")] . #[must_use = "this returns the result of the operation, \ . without modifying the original"] . #[inline] . #[rustc_inherit_overflow_checks] . pub const fn next_power_of_two(self) -> Self { 70,444 ( 0.00%) self.one_less_than_next_power_of_two() + 1 . } . . /// Returns the smallest power of two greater than or equal to `n`. If . /// the next power of two is greater than the type's maximum value, . /// `None` is returned, otherwise the power of two is wrapped in `Some`. . /// . /// # Examples . /// -- line 2195 ---------------------------------------- 383,382 ( 0.00%) -------------------------------------------------------------------------------- -- Auto-annotated source: /usr/home/liquid/.cargo/registry/src/github.com-1ecc6299db9ec823/ena-0.14.0/src/snapshot_vec.rs -------------------------------------------------------------------------------- Ir -- line 42 ---------------------------------------- . . impl Rollback> for SnapshotVecStorage { . fn reverse(&mut self, undo: UndoLog) { . self.values.reverse(undo) . } . } . impl Rollback> for Vec { . fn reverse(&mut self, undo: UndoLog) { 506,130 ( 0.00%) match undo { . NewElem(i) => { . self.pop(); 151,193 ( 0.00%) assert!(Vec::len(self) == i); . } . . SetElem(i, v) => { 132,649 ( 0.00%) self[i] = v; . } . . Other(u) => { . D::reverse(self, u); . } . } . } . } -- line 65 ---------------------------------------- -- line 76 ---------------------------------------- . impl VecLike for Vec . where . D: SnapshotVecDelegate, . { . fn push(&mut self, item: D::Value) { . Vec::push(self, item) . } . fn len(&self) -> usize { 155,861 ( 0.00%) Vec::len(self) . } . fn reserve(&mut self, size: usize) { . Vec::reserve(self, size) . } . } . . impl VecLike for &'_ mut Vec . where . D: SnapshotVecDelegate, . { . fn push(&mut self, item: D::Value) { . Vec::push(self, item) . } . fn len(&self) -> usize { 1,146,283 ( 0.01%) Vec::len(self) . } . fn reserve(&mut self, size: usize) { . Vec::reserve(self, size) . } . } . . #[allow(type_alias_bounds)] . pub type SnapshotVecStorage = -- line 107 ---------------------------------------- -- line 191 ---------------------------------------- . } . . impl, D: SnapshotVecDelegate, U> SnapshotVec { . pub fn len(&self) -> usize { . self.values.len() . } . . pub fn get(&self, index: usize) -> &D::Value { 20,552,187 ( 0.14%) &self.values.as_ref()[index] . } . . /// Returns a mutable pointer into the vec; whatever changes you make here cannot be undone . /// automatically, so you should be sure call `record()` with some sort of suitable undo . /// action. . pub fn get_mut(&mut self, index: usize) -> &mut D::Value { 46,664 ( 0.00%) &mut self.values.as_mut()[index] . } . . /// Reserve space for new values, just like an ordinary vec. . pub fn reserve(&mut self, additional: usize) { . // This is not affected by snapshots or anything. . self.values.reserve(additional); . } . } -- line 214 ---------------------------------------- -- line 219 ---------------------------------------- . } . . pub fn record(&mut self, action: D::Undo) { . if self.in_snapshot() { . self.undo_log.push(Other(action)); . } . } . 2,328,618 ( 0.02%) pub fn push(&mut self, elem: D::Value) -> usize { . let len = self.values.len(); . self.values.push(elem); . 310,735 ( 0.00%) if self.in_snapshot() { . self.undo_log.push(NewElem(len)); . } . . len 2,151,813 ( 0.01%) } . . /// Updates the element at the given index. The old value will saved (and perhaps restored) if . /// a snapshot is active. . pub fn set(&mut self, index: usize, new_elem: D::Value) { . let old_elem = mem::replace(&mut self.values.as_mut()[index], new_elem); . if self.undo_log.in_snapshot() { . self.undo_log.push(SetElem(index, old_elem)); . } -- line 244 ---------------------------------------- -- line 253 ---------------------------------------- . } . } else { . for i in 0..self.values.len() { . self.set(i, new_elems(i)); . } . } . } . 969,440 ( 0.01%) pub fn update(&mut self, index: usize, op: OP) . where . OP: FnOnce(&mut D::Value), . D::Value: Clone, . { 115,546 ( 0.00%) if self.undo_log.in_snapshot() { 425,627 ( 0.00%) let old_elem = self.values.as_mut()[index].clone(); 16,272 ( 0.00%) self.undo_log.push(SetElem(index, old_elem)); . } 335,246 ( 0.00%) op(&mut self.values.as_mut()[index]); 924,368 ( 0.01%) } . } . . impl SnapshotVec . where . D: SnapshotVecDelegate, . V: VecLike + Rollback>, . L: Snapshots>, . { -- line 279 ---------------------------------------- 193,818 ( 0.00%) -------------------------------------------------------------------------------- The following files chosen for auto-annotation could not be found: -------------------------------------------------------------------------------- ./elf/dl-lookup.c ./malloc/malloc.c ./stdlib/msort.c ./string/../sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S ./string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S ./string/../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S /tmp/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/../../../../gcc-5.5.0/libstdc++-v3/libsupc++/new_op.cc -------------------------------------------------------------------------------- Ir -------------------------------------------------------------------------------- 927,288,402 ( 6.17%) events annotated