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//===--------------- LLVMContextImpl.cpp - Implementation ------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements LLVMContextImpl, the opaque implementation
// of LLVMContext.
//
//===----------------------------------------------------------------------===//
#include "LLVMContextImpl.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/LLVMContext.h"
#include "llvm/MDNode.h"
using namespace llvm;
static char getValType(ConstantAggregateZero *CPZ) { return 0; }
LLVMContextImpl::LLVMContextImpl(LLVMContext &C) :
Context(C), TheTrueVal(0), TheFalseVal(0) { }
MDString *LLVMContextImpl::getMDString(const char *StrBegin,
unsigned StrLength) {
sys::SmartScopedWriter<true> Writer(ConstantsLock);
StringMapEntry<MDString *> &Entry =
MDStringCache.GetOrCreateValue(StringRef(StrBegin, StrLength));
MDString *&S = Entry.getValue();
if (!S) S = new MDString(Entry.getKeyData(),
Entry.getKeyLength());
return S;
}
MDNode *LLVMContextImpl::getMDNode(Value*const* Vals, unsigned NumVals) {
FoldingSetNodeID ID;
for (unsigned i = 0; i != NumVals; ++i)
ID.AddPointer(Vals[i]);
ConstantsLock.reader_acquire();
void *InsertPoint;
MDNode *N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
ConstantsLock.reader_release();
if (!N) {
sys::SmartScopedWriter<true> Writer(ConstantsLock);
N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!N) {
// InsertPoint will have been set by the FindNodeOrInsertPos call.
N = new MDNode(Vals, NumVals);
MDNodeSet.InsertNode(N, InsertPoint);
}
}
return N;
}
ConstantAggregateZero*
LLVMContextImpl::getConstantAggregateZero(const Type *Ty) {
assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
"Cannot create an aggregate zero of non-aggregate type!");
// Implicitly locked.
return AggZeroConstants.getOrCreate(Ty, 0);
}
// *** erase methods ***
void LLVMContextImpl::erase(MDString *M) {
sys::SmartScopedWriter<true> Writer(ConstantsLock);
MDStringCache.erase(MDStringCache.find(M->getString()));
}
void LLVMContextImpl::erase(MDNode *M) {
sys::SmartScopedWriter<true> Writer(ConstantsLock);
MDNodeSet.RemoveNode(M);
}
void LLVMContextImpl::erase(ConstantAggregateZero *Z) {
AggZeroConstants.remove(Z);
}
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