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Sometimes teardown happens before the debug info graph is complete (e.g., when clang throws an error). In that case, `MDNode`s will still have RAUW, so deleting constants that the `MDNode`s point at will be relatively expensive -- it'll cause re-uniquing all up the chain (what I've been referring to as "teardown madness"). So, drop references *before* deleting constants. We need to drop a few more references now: the metadata side of the metadata/value bridges needs to be dropped off the cliff along with the rest of it (previously, the bridges were cleaned before we did anything with the `MDNode`s). There's no real functionality change here -- state before and after `LLVMContextImpl::~LLVMContextImpl()` is unchanged -- so no testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226044 91177308-0d34-0410-b5e6-96231b3b80d8
185 lines
5.5 KiB
C++
185 lines
5.5 KiB
C++
//===-- LLVMContextImpl.cpp - Implement LLVMContextImpl -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the opaque LLVMContextImpl.
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//
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//===----------------------------------------------------------------------===//
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#include "LLVMContextImpl.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/Module.h"
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#include <algorithm>
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using namespace llvm;
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LLVMContextImpl::LLVMContextImpl(LLVMContext &C)
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: TheTrueVal(nullptr), TheFalseVal(nullptr),
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VoidTy(C, Type::VoidTyID),
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LabelTy(C, Type::LabelTyID),
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HalfTy(C, Type::HalfTyID),
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FloatTy(C, Type::FloatTyID),
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DoubleTy(C, Type::DoubleTyID),
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MetadataTy(C, Type::MetadataTyID),
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X86_FP80Ty(C, Type::X86_FP80TyID),
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FP128Ty(C, Type::FP128TyID),
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PPC_FP128Ty(C, Type::PPC_FP128TyID),
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X86_MMXTy(C, Type::X86_MMXTyID),
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Int1Ty(C, 1),
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Int8Ty(C, 8),
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Int16Ty(C, 16),
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Int32Ty(C, 32),
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Int64Ty(C, 64) {
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InlineAsmDiagHandler = nullptr;
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InlineAsmDiagContext = nullptr;
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DiagnosticHandler = nullptr;
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DiagnosticContext = nullptr;
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RespectDiagnosticFilters = false;
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YieldCallback = nullptr;
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YieldOpaqueHandle = nullptr;
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NamedStructTypesUniqueID = 0;
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}
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namespace {
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struct DropReferences {
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// Takes the value_type of a ConstantUniqueMap's internal map, whose 'second'
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// is a Constant*.
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template <typename PairT> void operator()(const PairT &P) {
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P.second->dropAllReferences();
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}
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};
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// Temporary - drops pair.first instead of second.
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struct DropFirst {
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// Takes the value_type of a ConstantUniqueMap's internal map, whose 'second'
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// is a Constant*.
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template<typename PairT>
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void operator()(const PairT &P) {
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P.first->dropAllReferences();
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}
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};
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}
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LLVMContextImpl::~LLVMContextImpl() {
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// NOTE: We need to delete the contents of OwnedModules, but Module's dtor
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// will call LLVMContextImpl::removeModule, thus invalidating iterators into
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// the container. Avoid iterators during this operation:
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while (!OwnedModules.empty())
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delete *OwnedModules.begin();
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// Drop references for MDNodes. Do this before Values get deleted to avoid
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// unnecessary RAUW when nodes are still unresolved.
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for (auto *I : DistinctMDNodes)
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I->dropAllReferences();
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for (auto *I : MDTuples)
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I->dropAllReferences();
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for (auto *I : MDLocations)
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I->dropAllReferences();
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// Also drop references that come from the Value bridges.
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for (auto &Pair : ValuesAsMetadata)
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Pair.second->dropUsers();
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for (auto &Pair : MetadataAsValues)
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Pair.second->dropUse();
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// Destroy MDNodes.
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for (UniquableMDNode *I : DistinctMDNodes)
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I->deleteAsSubclass();
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for (MDTuple *I : MDTuples)
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delete I;
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for (MDLocation *I : MDLocations)
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delete I;
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// Free the constants. This is important to do here to ensure that they are
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// freed before the LeakDetector is torn down.
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std::for_each(ExprConstants.map_begin(), ExprConstants.map_end(),
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DropFirst());
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std::for_each(ArrayConstants.map_begin(), ArrayConstants.map_end(),
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DropFirst());
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std::for_each(StructConstants.map_begin(), StructConstants.map_end(),
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DropFirst());
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std::for_each(VectorConstants.map_begin(), VectorConstants.map_end(),
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DropFirst());
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ExprConstants.freeConstants();
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ArrayConstants.freeConstants();
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StructConstants.freeConstants();
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VectorConstants.freeConstants();
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DeleteContainerSeconds(CAZConstants);
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DeleteContainerSeconds(CPNConstants);
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DeleteContainerSeconds(UVConstants);
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InlineAsms.freeConstants();
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DeleteContainerSeconds(IntConstants);
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DeleteContainerSeconds(FPConstants);
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for (StringMap<ConstantDataSequential*>::iterator I = CDSConstants.begin(),
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E = CDSConstants.end(); I != E; ++I)
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delete I->second;
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CDSConstants.clear();
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// Destroy attributes.
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for (FoldingSetIterator<AttributeImpl> I = AttrsSet.begin(),
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E = AttrsSet.end(); I != E; ) {
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FoldingSetIterator<AttributeImpl> Elem = I++;
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delete &*Elem;
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}
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// Destroy attribute lists.
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for (FoldingSetIterator<AttributeSetImpl> I = AttrsLists.begin(),
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E = AttrsLists.end(); I != E; ) {
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FoldingSetIterator<AttributeSetImpl> Elem = I++;
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delete &*Elem;
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}
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// Destroy attribute node lists.
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for (FoldingSetIterator<AttributeSetNode> I = AttrsSetNodes.begin(),
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E = AttrsSetNodes.end(); I != E; ) {
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FoldingSetIterator<AttributeSetNode> Elem = I++;
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delete &*Elem;
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}
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// Destroy MetadataAsValues.
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{
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SmallVector<MetadataAsValue *, 8> MDVs;
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MDVs.reserve(MetadataAsValues.size());
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for (auto &Pair : MetadataAsValues)
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MDVs.push_back(Pair.second);
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MetadataAsValues.clear();
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for (auto *V : MDVs)
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delete V;
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}
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// Destroy ValuesAsMetadata.
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for (auto &Pair : ValuesAsMetadata)
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delete Pair.second;
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// Destroy MDStrings.
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MDStringCache.clear();
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}
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// ConstantsContext anchors
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void UnaryConstantExpr::anchor() { }
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void BinaryConstantExpr::anchor() { }
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void SelectConstantExpr::anchor() { }
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void ExtractElementConstantExpr::anchor() { }
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void InsertElementConstantExpr::anchor() { }
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void ShuffleVectorConstantExpr::anchor() { }
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void ExtractValueConstantExpr::anchor() { }
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void InsertValueConstantExpr::anchor() { }
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void GetElementPtrConstantExpr::anchor() { }
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void CompareConstantExpr::anchor() { }
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