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https://github.com/c64scene-ar/llvm-6502.git
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9e9a0d5fc2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77635 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//===--------------- LLVMContextImpl.cpp - Implementation ------*- C++ -*--===//
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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 LLVMContextImpl, the opaque implementation
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// of LLVMContext.
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//
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//===----------------------------------------------------------------------===//
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#include "LLVMContextImpl.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Metadata.h"
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using namespace llvm;
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LLVMContextImpl::LLVMContextImpl(LLVMContext &C) :
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Context(C), TheTrueVal(0), TheFalseVal(0) { }
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MDString *LLVMContextImpl::getMDString(const char *StrBegin,
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unsigned StrLength) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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StringMapEntry<MDString *> &Entry =
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MDStringCache.GetOrCreateValue(StringRef(StrBegin, StrLength));
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MDString *&S = Entry.getValue();
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if (!S) S = new MDString(Entry.getKeyData(),
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Entry.getKeyLength());
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return S;
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}
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MDNode *LLVMContextImpl::getMDNode(Value*const* Vals, unsigned NumVals) {
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FoldingSetNodeID ID;
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for (unsigned i = 0; i != NumVals; ++i)
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ID.AddPointer(Vals[i]);
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ConstantsLock.reader_acquire();
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void *InsertPoint;
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MDNode *N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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ConstantsLock.reader_release();
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if (!N) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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if (!N) {
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// InsertPoint will have been set by the FindNodeOrInsertPos call.
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N = new MDNode(Vals, NumVals);
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MDNodeSet.InsertNode(N, InsertPoint);
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}
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}
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return N;
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}
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// *** erase methods ***
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void LLVMContextImpl::erase(MDString *M) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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MDStringCache.erase(MDStringCache.find(M->getString()));
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}
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void LLVMContextImpl::erase(MDNode *M) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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MDNodeSet.RemoveNode(M);
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}
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