llvm-6502/lib/VMCore/LLVMContext.cpp
Devang Patel 68f195cc50 While replacing an MDNode elment, properly update MDNode's operand list.
MDNode's operand list does not include all elements.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81045 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-04 21:32:05 +00:00

73 lines
2.1 KiB
C++

//===-- LLVMContext.cpp - Implement LLVMContext -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements LLVMContext, as a wrapper around the opaque
// class LLVMContextImpl.
//
//===----------------------------------------------------------------------===//
#include "llvm/LLVMContext.h"
#include "llvm/Metadata.h"
#include "llvm/Constants.h"
#include "llvm/Instruction.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/ValueHandle.h"
#include "LLVMContextImpl.h"
#include <set>
using namespace llvm;
static ManagedStatic<LLVMContext> GlobalContext;
LLVMContext& llvm::getGlobalContext() {
return *GlobalContext;
}
LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) { }
LLVMContext::~LLVMContext() { delete pImpl; }
GetElementPtrConstantExpr::GetElementPtrConstantExpr
(Constant *C,
const std::vector<Constant*> &IdxList,
const Type *DestTy)
: ConstantExpr(DestTy, Instruction::GetElementPtr,
OperandTraits<GetElementPtrConstantExpr>::op_end(this)
- (IdxList.size()+1),
IdxList.size()+1) {
OperandList[0] = C;
for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
OperandList[i+1] = IdxList[i];
}
bool LLVMContext::RemoveDeadMetadata() {
std::vector<WeakVH> DeadMDNodes;
bool Changed = false;
while (1) {
for (FoldingSet<MDNode>::iterator
I = pImpl->MDNodeSet.begin(),
E = pImpl->MDNodeSet.end(); I != E; ++I) {
MDNode *N = &(*I);
if (N->use_empty())
DeadMDNodes.push_back(WeakVH(N));
}
if (DeadMDNodes.empty())
return Changed;
while (!DeadMDNodes.empty()) {
Value *V = DeadMDNodes.back(); DeadMDNodes.pop_back();
if (const MDNode *N = dyn_cast_or_null<MDNode>(V))
if (N->use_empty())
delete N;
}
}
return Changed;
}