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d9489cbb0c
Use FoldingSetNode to unique MDNodes in a context. Use CallbackVH hooks to update context's MDNodeSet appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80839 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
//===-- LLVMContext.cpp - Implement LLVMContext -----------------------===//
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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 LLVMContext, as a wrapper around the opaque
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// class LLVMContextImpl.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/LLVMContext.h"
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#include "llvm/Metadata.h"
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#include "llvm/Constants.h"
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#include "llvm/Instruction.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "LLVMContextImpl.h"
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#include <set>
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using namespace llvm;
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static ManagedStatic<LLVMContext> GlobalContext;
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LLVMContext& llvm::getGlobalContext() {
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return *GlobalContext;
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}
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LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) { }
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LLVMContext::~LLVMContext() { delete pImpl; }
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GetElementPtrConstantExpr::GetElementPtrConstantExpr
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(Constant *C,
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const std::vector<Constant*> &IdxList,
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const Type *DestTy)
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: ConstantExpr(DestTy, Instruction::GetElementPtr,
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OperandTraits<GetElementPtrConstantExpr>::op_end(this)
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- (IdxList.size()+1),
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IdxList.size()+1) {
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OperandList[0] = C;
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for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
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OperandList[i+1] = IdxList[i];
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}
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bool LLVMContext::RemoveDeadMetadata() {
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std::vector<const MDNode *> DeadMDNodes;
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bool Changed = false;
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while (1) {
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for (FoldingSet<MDNode>::iterator
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I = pImpl->MDNodeSet.begin(),
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E = pImpl->MDNodeSet.end(); I != E; ++I) {
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const MDNode *N = &(*I);
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if (N->use_empty())
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DeadMDNodes.push_back(N);
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}
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if (DeadMDNodes.empty())
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return Changed;
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while (!DeadMDNodes.empty()) {
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const MDNode *N = DeadMDNodes.back(); DeadMDNodes.pop_back();
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delete N;
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}
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}
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return Changed;
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}
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