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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78948 91177308-0d34-0410-b5e6-96231b3b80d8
152 lines
4.7 KiB
C++
152 lines
4.7 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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//MetadataBase implementation
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//
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/// resizeOperands - Metadata keeps track of other metadata uses using
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/// OperandList. Resize this list to hold anticipated number of metadata
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/// operands.
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void MetadataBase::resizeOperands(unsigned NumOps) {
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unsigned e = getNumOperands();
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if (NumOps == 0) {
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NumOps = e*2;
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if (NumOps < 2) NumOps = 2;
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} else if (NumOps > NumOperands) {
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// No resize needed.
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if (ReservedSpace >= NumOps) return;
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} else if (NumOps == NumOperands) {
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if (ReservedSpace == NumOps) return;
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} else {
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return;
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}
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ReservedSpace = NumOps;
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Use *OldOps = OperandList;
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Use *NewOps = allocHungoffUses(NumOps);
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std::copy(OldOps, OldOps + e, NewOps);
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OperandList = NewOps;
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if (OldOps) Use::zap(OldOps, OldOps + e, true);
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}
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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(Context, 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(LLVMContext &C, Value*const* Vals, unsigned NumVals)
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: MetadataBase(Type::getMetadataTy(C), Value::MDNodeVal) {
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NumOperands = 0;
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resizeOperands(NumVals);
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for (unsigned i = 0; i != NumVals; ++i) {
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// Only record metadata uses.
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if (MetadataBase *MB = dyn_cast_or_null<MetadataBase>(Vals[i]))
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OperandList[NumOperands++] = MB;
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Node.push_back(WeakVH(Vals[i]));
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}
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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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std::vector<Value*> V;
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V.reserve(NumVals);
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for (unsigned i = 0; i < NumVals; ++i)
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V.push_back(Vals[i]);
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return pImpl->MDNodes.getOrCreate(Type::getMetadataTy(Context), V);
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}
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/// dropAllReferences - Remove all uses and clear node vector.
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void MDNode::dropAllReferences() {
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User::dropAllReferences();
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Node.clear();
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}
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static std::vector<Value*> getValType(MDNode *N) {
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std::vector<Value*> Elements;
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Elements.reserve(N->getNumElements());
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for (unsigned i = 0, e = N->getNumElements(); i != e; ++i)
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Elements.push_back(N->getElement(i));
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return Elements;
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}
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MDNode::~MDNode() {
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dropAllReferences();
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getType()->getContext().pImpl->MDNodes.remove(this);
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}
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//===----------------------------------------------------------------------===//
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//NamedMDNode implementation
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//
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NamedMDNode::NamedMDNode(LLVMContext &C, const Twine &N,
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MetadataBase*const* MDs,
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unsigned NumMDs, Module *ParentModule)
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: MetadataBase(Type::getMetadataTy(C), Value::NamedMDNodeVal), Parent(0) {
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setName(N);
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NumOperands = 0;
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resizeOperands(NumMDs);
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for (unsigned i = 0; i != NumMDs; ++i) {
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if (MDs[i])
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OperandList[NumOperands++] = MDs[i];
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Node.push_back(WeakMetadataVH(MDs[i]));
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}
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if (ParentModule)
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ParentModule->getNamedMDList().push_back(this);
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}
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NamedMDNode *NamedMDNode::Create(const NamedMDNode *NMD, Module *M) {
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assert (NMD && "Invalid source NamedMDNode!");
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SmallVector<MetadataBase *, 4> Elems;
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for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i)
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Elems.push_back(NMD->getElement(i));
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return new NamedMDNode(NMD->getContext(), NMD->getName().data(),
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Elems.data(), Elems.size(), M);
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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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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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User::dropAllReferences();
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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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