mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a82f8838c6
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77959 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
//===-- Metadata.cpp - Implement Metadata classes -------------------------===//
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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 Metadata classes.
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//
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//===----------------------------------------------------------------------===//
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#include "LLVMContextImpl.h"
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#include "llvm/Metadata.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "SymbolTableListTraitsImpl.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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//MDString implementation
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//
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MDString *MDString::get(LLVMContext &Context, const StringRef &Str) {
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LLVMContextImpl *pImpl = Context.pImpl;
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sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
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StringMapEntry<MDString *> &Entry =
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pImpl->MDStringCache.GetOrCreateValue(Str);
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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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//===----------------------------------------------------------------------===//
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//MDNode implementation
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//
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MDNode::MDNode(Value*const* Vals, unsigned NumVals)
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: MetadataBase(Type::MetadataTy, Value::MDNodeVal) {
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for (unsigned i = 0; i != NumVals; ++i)
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Node.push_back(WeakVH(Vals[i]));
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}
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void MDNode::Profile(FoldingSetNodeID &ID) const {
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for (const_elem_iterator I = elem_begin(), E = elem_end(); I != E; ++I)
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ID.AddPointer(*I);
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}
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MDNode *MDNode::get(LLVMContext &Context, Value*const* Vals, unsigned NumVals) {
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LLVMContextImpl *pImpl = Context.pImpl;
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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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pImpl->ConstantsLock.reader_acquire();
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void *InsertPoint;
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MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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pImpl->ConstantsLock.reader_release();
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if (!N) {
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sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
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N = pImpl->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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pImpl->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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//===----------------------------------------------------------------------===//
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//NamedMDNode implementation
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//
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NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
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unsigned NumMDs, Module *ParentModule)
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: MetadataBase(Type::MetadataTy, Value::NamedMDNodeVal), Parent(0) {
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setName(N);
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for (unsigned i = 0; i != NumMDs; ++i)
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Node.push_back(WeakMetadataVH(MDs[i]));
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if (ParentModule)
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ParentModule->getNamedMDList().push_back(this);
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}
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/// eraseFromParent - Drop all references and remove the node from parent
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/// module.
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void NamedMDNode::eraseFromParent() {
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dropAllReferences();
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getParent()->getNamedMDList().erase(this);
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}
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/// dropAllReferences - Remove all uses and clear node vector.
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void NamedMDNode::dropAllReferences() {
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// FIXME: Update metadata use list.
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Node.clear();
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}
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NamedMDNode::~NamedMDNode() {
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dropAllReferences();
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}
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