forked from OSchip/llvm-project
482 lines
16 KiB
C++
482 lines
16 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 "llvm/Instruction.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.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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//===----------------------------------------------------------------------===//
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// MDString implementation.
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//
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MDString *MDString::get(LLVMContext &Context, StringRef Str) {
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LLVMContextImpl *pImpl = Context.pImpl;
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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.getKey());
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return S;
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}
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MDString *MDString::get(LLVMContext &Context, const char *Str) {
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LLVMContextImpl *pImpl = Context.pImpl;
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StringMapEntry<MDString *> &Entry =
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pImpl->MDStringCache.GetOrCreateValue(Str ? StringRef(Str) : StringRef());
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MDString *&S = Entry.getValue();
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if (!S) S = new MDString(Context, Entry.getKey());
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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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NodeSize = NumVals;
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Node = new ElementVH[NodeSize];
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ElementVH *Ptr = Node;
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for (unsigned i = 0; i != NumVals; ++i)
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*Ptr++ = ElementVH(Vals[i], this);
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}
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void MDNode::Profile(FoldingSetNodeID &ID) const {
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for (unsigned i = 0, e = getNumElements(); i != e; ++i)
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ID.AddPointer(getElement(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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void *InsertPoint;
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MDNode *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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return N;
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}
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/// ~MDNode - Destroy MDNode.
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MDNode::~MDNode() {
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LLVMContextImpl *pImpl = getType()->getContext().pImpl;
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pImpl->MDNodeSet.RemoveNode(this);
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delete [] Node;
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Node = NULL;
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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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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 (unsigned i = 0, e = getNumElements(); i != e; ++i, ++Index) {
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Value *V = getElement(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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pImpl->MDNodeSet.RemoveNode(this);
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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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void *InsertPoint;
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MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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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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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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// 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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for (unsigned i = 0; i != NumMDs; ++i)
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Node.push_back(TrackingVH<MetadataBase>(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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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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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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//===----------------------------------------------------------------------===//
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// MetadataContextImpl implementation.
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//
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namespace llvm {
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class MetadataContextImpl {
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public:
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typedef std::pair<unsigned, TrackingVH<MDNode> > MDPairTy;
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typedef SmallVector<MDPairTy, 2> MDMapTy;
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typedef DenseMap<const Instruction *, MDMapTy> MDStoreTy;
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friend class BitcodeReader;
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private:
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/// MetadataStore - Collection of metadata used in this context.
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MDStoreTy MetadataStore;
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/// MDHandlerNames - Map to hold metadata handler names.
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StringMap<unsigned> MDHandlerNames;
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public:
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/// registerMDKind - Register a new metadata kind and return its ID.
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/// A metadata kind can be registered only once.
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unsigned registerMDKind(StringRef Name);
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/// getMDKind - Return metadata kind. If the requested metadata kind
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/// is not registered then return 0.
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unsigned getMDKind(StringRef Name) const;
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/// getMD - Get the metadata of given kind attached to an Instruction.
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/// If the metadata is not found then return 0.
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MDNode *getMD(unsigned Kind, const Instruction *Inst);
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/// getMDs - Get the metadata attached to an Instruction.
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void getMDs(const Instruction *Inst, SmallVectorImpl<MDPairTy> &MDs) const;
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/// addMD - Attach the metadata of given kind to an Instruction.
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void addMD(unsigned Kind, MDNode *Node, Instruction *Inst);
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/// removeMD - Remove metadata of given kind attached with an instruction.
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void removeMD(unsigned Kind, Instruction *Inst);
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/// removeAllMetadata - Remove all metadata attached with an instruction.
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void removeAllMetadata(Instruction *Inst);
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/// copyMD - If metadata is attached with Instruction In1 then attach
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/// the same metadata to In2.
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void copyMD(Instruction *In1, Instruction *In2);
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/// getHandlerNames - Populate client-supplied smallvector using custom
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/// metadata name and ID.
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void getHandlerNames(SmallVectorImpl<std::pair<unsigned, StringRef> >&) const;
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/// ValueIsDeleted - This handler is used to update metadata store
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/// when a value is deleted.
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void ValueIsDeleted(const Value *) {}
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void ValueIsDeleted(Instruction *Inst) {
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removeAllMetadata(Inst);
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}
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void ValueIsRAUWd(Value *V1, Value *V2);
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/// ValueIsCloned - This handler is used to update metadata store
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/// when In1 is cloned to create In2.
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void ValueIsCloned(const Instruction *In1, Instruction *In2);
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};
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}
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/// registerMDKind - Register a new metadata kind and return its ID.
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/// A metadata kind can be registered only once.
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unsigned MetadataContextImpl::registerMDKind(StringRef Name) {
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unsigned Count = MDHandlerNames.size();
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assert(MDHandlerNames.count(Name) == 0 && "Already registered MDKind!");
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return MDHandlerNames[Name] = Count + 1;
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}
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/// getMDKind - Return metadata kind. If the requested metadata kind
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/// is not registered then return 0.
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unsigned MetadataContextImpl::getMDKind(StringRef Name) const {
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StringMap<unsigned>::const_iterator I = MDHandlerNames.find(Name);
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if (I == MDHandlerNames.end())
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return 0;
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return I->getValue();
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}
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/// addMD - Attach the metadata of given kind to an Instruction.
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void MetadataContextImpl::addMD(unsigned MDKind, MDNode *Node,
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Instruction *Inst) {
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assert(Node && "Invalid null MDNode");
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Inst->HasMetadata = true;
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MDMapTy &Info = MetadataStore[Inst];
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if (Info.empty()) {
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Info.push_back(std::make_pair(MDKind, Node));
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MetadataStore.insert(std::make_pair(Inst, Info));
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return;
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}
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// If there is an entry for this MDKind then replace it.
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for (unsigned i = 0, e = Info.size(); i != e; ++i) {
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MDPairTy &P = Info[i];
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if (P.first == MDKind) {
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Info[i] = std::make_pair(MDKind, Node);
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return;
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}
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}
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// Otherwise add a new entry.
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Info.push_back(std::make_pair(MDKind, Node));
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}
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/// removeMD - Remove metadata of given kind attached with an instruction.
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void MetadataContextImpl::removeMD(unsigned Kind, Instruction *Inst) {
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MDStoreTy::iterator I = MetadataStore.find(Inst);
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if (I == MetadataStore.end())
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return;
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MDMapTy &Info = I->second;
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for (MDMapTy::iterator MI = Info.begin(), ME = Info.end(); MI != ME; ++MI) {
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MDPairTy &P = *MI;
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if (P.first == Kind) {
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Info.erase(MI);
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return;
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}
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}
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}
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/// removeAllMetadata - Remove all metadata attached with an instruction.
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void MetadataContextImpl::removeAllMetadata(Instruction *Inst) {
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MetadataStore.erase(Inst);
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Inst->HasMetadata = false;
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}
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/// copyMD - If metadata is attached with Instruction In1 then attach
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/// the same metadata to In2.
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void MetadataContextImpl::copyMD(Instruction *In1, Instruction *In2) {
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assert(In1 && In2 && "Invalid instruction!");
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MDMapTy &In1Info = MetadataStore[In1];
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if (In1Info.empty())
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return;
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for (MDMapTy::iterator I = In1Info.begin(), E = In1Info.end(); I != E; ++I)
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addMD(I->first, I->second, In2);
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}
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/// getMD - Get the metadata of given kind attached to an Instruction.
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/// If the metadata is not found then return 0.
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MDNode *MetadataContextImpl::getMD(unsigned MDKind, const Instruction *Inst) {
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MDMapTy &Info = MetadataStore[Inst];
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if (Info.empty())
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return NULL;
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for (MDMapTy::iterator I = Info.begin(), E = Info.end(); I != E; ++I)
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if (I->first == MDKind)
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return I->second;
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return NULL;
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}
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/// getMDs - Get the metadata attached to an Instruction.
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void MetadataContextImpl::
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getMDs(const Instruction *Inst, SmallVectorImpl<MDPairTy> &MDs) const {
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MDStoreTy::const_iterator I = MetadataStore.find(Inst);
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if (I == MetadataStore.end())
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return;
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MDs.resize(I->second.size());
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for (MDMapTy::const_iterator MI = I->second.begin(), ME = I->second.end();
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MI != ME; ++MI)
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// MD kinds are numbered from 1.
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MDs[MI->first - 1] = std::make_pair(MI->first, MI->second);
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}
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/// getHandlerNames - Populate client supplied smallvector using custome
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/// metadata name and ID.
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void MetadataContextImpl::
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getHandlerNames(SmallVectorImpl<std::pair<unsigned, StringRef> >&Names) const {
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Names.resize(MDHandlerNames.size());
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for (StringMap<unsigned>::const_iterator I = MDHandlerNames.begin(),
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E = MDHandlerNames.end(); I != E; ++I)
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// MD Handlers are numbered from 1.
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Names[I->second - 1] = std::make_pair(I->second, I->first());
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}
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/// ValueIsCloned - This handler is used to update metadata store
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/// when In1 is cloned to create In2.
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void MetadataContextImpl::ValueIsCloned(const Instruction *In1,
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Instruction *In2) {
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// Find Metadata handles for In1.
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MDStoreTy::iterator I = MetadataStore.find(In1);
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assert(I != MetadataStore.end() && "Invalid custom metadata info!");
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// FIXME : Give all metadata handlers a chance to adjust.
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MDMapTy &In1Info = I->second;
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MDMapTy In2Info;
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for (MDMapTy::iterator I = In1Info.begin(), E = In1Info.end(); I != E; ++I)
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addMD(I->first, I->second, In2);
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}
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/// ValueIsRAUWd - This handler is used when V1's all uses are replaced by
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/// V2.
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void MetadataContextImpl::ValueIsRAUWd(Value *V1, Value *V2) {
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Instruction *I1 = dyn_cast<Instruction>(V1);
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Instruction *I2 = dyn_cast<Instruction>(V2);
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if (!I1 || !I2)
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return;
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// FIXME : Give custom handlers a chance to override this.
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ValueIsCloned(I1, I2);
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}
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//===----------------------------------------------------------------------===//
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// MetadataContext implementation.
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//
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MetadataContext::MetadataContext()
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: pImpl(new MetadataContextImpl()) { }
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MetadataContext::~MetadataContext() { delete pImpl; }
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/// isValidName - Return true if Name is a valid custom metadata handler name.
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bool MetadataContext::isValidName(StringRef MDName) {
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if (MDName.empty())
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return false;
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if (!isalpha(MDName[0]))
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return false;
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for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
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++I) {
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if (!isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
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return false;
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}
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return true;
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}
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/// registerMDKind - Register a new metadata kind and return its ID.
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/// A metadata kind can be registered only once.
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unsigned MetadataContext::registerMDKind(StringRef Name) {
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assert(isValidName(Name) && "Invalid custome metadata name!");
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return pImpl->registerMDKind(Name);
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}
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/// getMDKind - Return metadata kind. If the requested metadata kind
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/// is not registered then return 0.
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unsigned MetadataContext::getMDKind(StringRef Name) const {
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return pImpl->getMDKind(Name);
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}
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/// getMD - Get the metadata of given kind attached to an Instruction.
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/// If the metadata is not found then return 0.
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MDNode *MetadataContext::getMD(unsigned Kind, const Instruction *Inst) {
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return pImpl->getMD(Kind, Inst);
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}
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/// getMDs - Get the metadata attached to an Instruction.
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void MetadataContext::
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getMDs(const Instruction *Inst,
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SmallVectorImpl<std::pair<unsigned, TrackingVH<MDNode> > > &MDs) const {
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return pImpl->getMDs(Inst, MDs);
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}
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/// addMD - Attach the metadata of given kind to an Instruction.
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void MetadataContext::addMD(unsigned Kind, MDNode *Node, Instruction *Inst) {
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pImpl->addMD(Kind, Node, Inst);
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}
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/// removeMD - Remove metadata of given kind attached with an instruction.
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void MetadataContext::removeMD(unsigned Kind, Instruction *Inst) {
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pImpl->removeMD(Kind, Inst);
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}
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/// removeAllMetadata - Remove all metadata attached with an instruction.
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void MetadataContext::removeAllMetadata(Instruction *Inst) {
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pImpl->removeAllMetadata(Inst);
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}
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/// copyMD - If metadata is attached with Instruction In1 then attach
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/// the same metadata to In2.
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void MetadataContext::copyMD(Instruction *In1, Instruction *In2) {
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pImpl->copyMD(In1, In2);
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}
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/// getHandlerNames - Populate client supplied smallvector using custome
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/// metadata name and ID.
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void MetadataContext::
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getHandlerNames(SmallVectorImpl<std::pair<unsigned, StringRef> >&N) const {
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pImpl->getHandlerNames(N);
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}
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/// ValueIsDeleted - This handler is used to update metadata store
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/// when a value is deleted.
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void MetadataContext::ValueIsDeleted(Instruction *Inst) {
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pImpl->ValueIsDeleted(Inst);
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}
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void MetadataContext::ValueIsRAUWd(Value *V1, Value *V2) {
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pImpl->ValueIsRAUWd(V1, V2);
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}
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/// ValueIsCloned - This handler is used to update metadata store
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/// when In1 is cloned to create In2.
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void MetadataContext::ValueIsCloned(const Instruction *In1, Instruction *In2) {
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pImpl->ValueIsCloned(In1, In2);
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}
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