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270 lines
8.3 KiB
C++
270 lines
8.3 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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else if(Vals[i] &&
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Vals[i]->getType()->getTypeID() == Type::MetadataTyID)
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OperandList[NumOperands++] = Vals[i];
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Node.push_back(ElementVH(Vals[i], this));
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}
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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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// FIXME: MDNode uniquing disabled temporarily.
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#ifndef ENABLE_MDNODE_UNIQUING
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return new MDNode(Context, Vals, NumVals);
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#endif
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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(Context, 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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/// 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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MDNode::~MDNode() {
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// FIXME: MDNode uniquing disabled temporarily.
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#ifdef ENABLE_MDNODE_UNIQUING
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getType()->getContext().pImpl->MDNodeSet.RemoveNode(this);
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#endif
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dropAllReferences();
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}
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// Replace value from this node's element list.
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void MDNode::replaceElement(Value *From, Value *To) {
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// FIXME: MDNode uniquing disabled temporarily.
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#ifndef ENABLE_MDNODE_UNIQUING
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if (From == To || !getType())
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return;
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for (SmallVector<ElementVH, 4>::iterator I = Node.begin(),
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E = Node.end(); I != E; ++I)
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if (*I && *I == From)
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*I = ElementVH(To, this);
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return;
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#endif
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if (From == To || !getType())
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return;
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LLVMContext &Context = getType()->getContext();
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LLVMContextImpl *pImpl = Context.pImpl;
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// Find value. This is a linear search, do something if it consumes
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// lot of time. It is possible that to have multiple instances of
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// From in this MDNode's element list.
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SmallVector<unsigned, 4> Indexes;
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unsigned Index = 0;
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for (SmallVector<ElementVH, 4>::iterator I = Node.begin(),
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E = Node.end(); I != E; ++I, ++Index) {
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Value *V = *I;
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if (V && V == From)
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Indexes.push_back(Index);
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}
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if (Indexes.empty())
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return;
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// Remove "this" from the context map.
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{
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sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
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pImpl->MDNodeSet.RemoveNode(this);
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}
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// MDNode only lists metadata elements in operand list, because MDNode
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// used by MDNode is considered a valid use. However on the side, MDNode
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// using a non-metadata value is not considered a "use" of non-metadata
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// value.
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SmallVector<unsigned, 4> OpIndexes;
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unsigned OpIndex = 0;
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for (User::op_iterator OI = op_begin(), OE = op_end();
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OI != OE; ++OI, OpIndex++) {
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if (*OI == From)
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OpIndexes.push_back(OpIndex);
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}
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if (MetadataBase *MDTo = dyn_cast_or_null<MetadataBase>(To)) {
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for (SmallVector<unsigned, 4>::iterator OI = OpIndexes.begin(),
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OE = OpIndexes.end(); OI != OE; ++OI)
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setOperand(*OI, MDTo);
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} else {
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for (SmallVector<unsigned, 4>::iterator OI = OpIndexes.begin(),
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OE = OpIndexes.end(); OI != OE; ++OI)
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setOperand(*OI, 0);
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}
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// Replace From element(s) in place.
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for (SmallVector<unsigned, 4>::iterator I = Indexes.begin(), E = Indexes.end();
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I != E; ++I) {
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unsigned Index = *I;
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Node[Index] = ElementVH(To, this);
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}
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// Insert updated "this" into the context's folding node set.
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// If a node with same element list already exist then before inserting
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// updated "this" into the folding node set, replace all uses of existing
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// node with updated "this" node.
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FoldingSetNodeID ID;
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Profile(ID);
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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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N->replaceAllUsesWith(this);
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delete N;
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N = 0;
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}
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{
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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 = this;
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pImpl->MDNodeSet.InsertNode(N, InsertPoint);
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}
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}
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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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