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getMDKindID/getMDKindNames methods to LLVMContext (and add convenience methods to Module), eliminating MetadataContext. Move the state that it maintains out to LLVMContext. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92259 91177308-0d34-0410-b5e6-96231b3b80d8
385 lines
12 KiB
C++
385 lines
12 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 "llvm/Metadata.h"
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#include "LLVMContextImpl.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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#include "llvm/Support/ValueHandle.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(LLVMContext &C, StringRef S)
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: MetadataBase(Type::getMetadataTy(C), Value::MDStringVal), Str(S) {}
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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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// MDNodeElement implementation.
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//
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// Use CallbackVH to hold MDNode elements.
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namespace llvm {
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class MDNodeElement : public CallbackVH {
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MDNode *Parent;
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public:
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MDNodeElement() {}
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MDNodeElement(Value *V, MDNode *P) : CallbackVH(V), Parent(P) {}
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~MDNodeElement() {}
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void set(Value *V, MDNode *P) {
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setValPtr(V);
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Parent = P;
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}
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virtual void deleted();
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virtual void allUsesReplacedWith(Value *NV);
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};
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} // end namespace llvm.
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void MDNodeElement::deleted() {
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Parent->replaceElement(this, 0);
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}
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void MDNodeElement::allUsesReplacedWith(Value *NV) {
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Parent->replaceElement(this, NV);
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}
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//===----------------------------------------------------------------------===//
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// MDNode implementation.
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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 [] Operands;
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Operands = NULL;
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}
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MDNode::MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
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bool isFunctionLocal)
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: MetadataBase(Type::getMetadataTy(C), Value::MDNodeVal) {
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NumOperands = NumVals;
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Operands = new MDNodeElement[NumOperands];
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for (unsigned i = 0; i != NumVals; ++i)
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Operands[i].set(Vals[i], this);
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if (isFunctionLocal)
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setValueSubclassData(getSubclassDataFromValue() | FunctionLocalBit);
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}
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MDNode *MDNode::get(LLVMContext &Context, Value*const* Vals, unsigned NumVals,
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bool isFunctionLocal) {
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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, isFunctionLocal);
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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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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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// HASH TABLE COLLISIONS?
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// DO NOT REINSERT AFTER AN OPERAND DROPS TO NULL!
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}
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/// getElement - Return specified element.
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Value *MDNode::getElement(unsigned i) const {
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assert(i < getNumElements() && "Invalid element number!");
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return Operands[i];
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}
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// Replace value from this node's element list.
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void MDNode::replaceElement(MDNodeElement *Op, Value *To) {
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Value *From = *Op;
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if (From == To)
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return;
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LLVMContextImpl *pImpl = getType()->getContext().pImpl;
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// Remove "this" from the context map. FoldingSet doesn't have to reprofile
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// this node to remove it, so we don't care what state the operands are in.
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pImpl->MDNodeSet.RemoveNode(this);
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// Update the operand.
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Op->set(To, this);
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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 = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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assert(N == 0 && "shouldn't be in the map now!"); (void)N;
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}
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// InsertPoint will have been set by the FindNodeOrInsertPos call.
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pImpl->MDNodeSet.InsertNode(this, InsertPoint);
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}
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//===----------------------------------------------------------------------===//
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// NamedMDNode implementation.
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//
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static SmallVector<TrackingVH<MetadataBase>, 4> &getNMDOps(void *Operands) {
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return *(SmallVector<TrackingVH<MetadataBase>, 4>*)Operands;
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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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Operands = new SmallVector<TrackingVH<MetadataBase>, 4>();
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SmallVector<TrackingVH<MetadataBase>, 4> &Node = getNMDOps(Operands);
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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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Elems.reserve(NMD->getNumElements());
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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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NamedMDNode::~NamedMDNode() {
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dropAllReferences();
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delete &getNMDOps(Operands);
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}
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/// getNumElements - Return number of NamedMDNode elements.
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unsigned NamedMDNode::getNumElements() const {
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return (unsigned)getNMDOps(Operands).size();
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}
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/// getElement - Return specified element.
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MetadataBase *NamedMDNode::getElement(unsigned i) const {
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assert(i < getNumElements() && "Invalid element number!");
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return getNMDOps(Operands)[i];
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}
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/// addElement - Add metadata element.
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void NamedMDNode::addElement(MetadataBase *M) {
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getNMDOps(Operands).push_back(TrackingVH<MetadataBase>(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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getNMDOps(Operands).clear();
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}
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//===----------------------------------------------------------------------===//
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// MetadataContext implementation.
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//
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#ifndef NDEBUG
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/// isValidName - Return true if Name is a valid custom metadata handler name.
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static bool 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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#endif
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/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
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unsigned LLVMContext::getMDKindID(StringRef Name) const {
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assert(isValidName(Name) && "Invalid MDNode name");
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unsigned &Entry = pImpl->CustomMDKindNames[Name];
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// If this is new, assign it its ID.
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if (Entry == 0) Entry = pImpl->CustomMDKindNames.size();
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return Entry;
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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 LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
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Names.resize(pImpl->CustomMDKindNames.size()+1);
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Names[0] = "";
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for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
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E = pImpl->CustomMDKindNames.end(); I != E; ++I)
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// MD Handlers are numbered from 1.
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Names[I->second] = I->first();
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}
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//===----------------------------------------------------------------------===//
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// Instruction Metadata method implementations.
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//
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void Instruction::setMetadata(const char *Kind, MDNode *Node) {
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if (Node == 0 && !hasMetadata()) return;
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setMetadata(getContext().getMDKindID(Kind), Node);
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}
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MDNode *Instruction::getMetadataImpl(const char *Kind) const {
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return getMetadataImpl(getContext().getMDKindID(Kind));
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}
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/// setMetadata - Set the metadata of of the specified kind to the specified
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/// node. This updates/replaces metadata if already present, or removes it if
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/// Node is null.
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void Instruction::setMetadata(unsigned KindID, MDNode *Node) {
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if (Node == 0 && !hasMetadata()) return;
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// Handle the case when we're adding/updating metadata on an instruction.
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if (Node) {
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LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
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assert(!Info.empty() == hasMetadata() && "HasMetadata bit is wonked");
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if (Info.empty()) {
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setHasMetadata(true);
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} else {
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// Handle replacement of an existing value.
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for (unsigned i = 0, e = Info.size(); i != e; ++i)
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if (Info[i].first == KindID) {
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Info[i].second = Node;
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return;
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}
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}
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// No replacement, just add it to the list.
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Info.push_back(std::make_pair(KindID, Node));
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return;
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}
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// Otherwise, we're removing metadata from an instruction.
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assert(hasMetadata() && getContext().pImpl->MetadataStore.count(this) &&
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"HasMetadata bit out of date!");
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LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
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// Common case is removing the only entry.
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if (Info.size() == 1 && Info[0].first == KindID) {
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getContext().pImpl->MetadataStore.erase(this);
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setHasMetadata(false);
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return;
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}
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// Handle replacement of an existing value.
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for (unsigned i = 0, e = Info.size(); i != e; ++i)
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if (Info[i].first == KindID) {
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Info[i] = Info.back();
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Info.pop_back();
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assert(!Info.empty() && "Removing last entry should be handled above");
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return;
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}
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// Otherwise, removing an entry that doesn't exist on the instruction.
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}
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MDNode *Instruction::getMetadataImpl(unsigned KindID) const {
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LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
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assert(hasMetadata() && !Info.empty() && "Shouldn't have called this");
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for (LLVMContextImpl::MDMapTy::iterator I = Info.begin(), E = Info.end();
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I != E; ++I)
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if (I->first == KindID)
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return I->second;
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return 0;
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}
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void Instruction::getAllMetadataImpl(SmallVectorImpl<std::pair<unsigned,
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MDNode*> > &Result)const {
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assert(hasMetadata() && getContext().pImpl->MetadataStore.count(this) &&
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"Shouldn't have called this");
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const LLVMContextImpl::MDMapTy &Info =
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getContext().pImpl->MetadataStore.find(this)->second;
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assert(!Info.empty() && "Shouldn't have called this");
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Result.clear();
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Result.append(Info.begin(), Info.end());
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// Sort the resulting array so it is stable.
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if (Result.size() > 1)
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array_pod_sort(Result.begin(), Result.end());
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}
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/// removeAllMetadata - Remove all metadata from this instruction.
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void Instruction::removeAllMetadata() {
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assert(hasMetadata() && "Caller should check");
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getContext().pImpl->MetadataStore.erase(this);
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setHasMetadata(false);
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}
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