1 //===-- Metadata.cpp - Implement Metadata classes -------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Metadata classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Metadata.h"
15 #include "LLVMContextImpl.h"
16 #include "llvm/LLVMContext.h"
17 #include "llvm/Module.h"
18 #include "llvm/Instruction.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/StringMap.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "SymbolTableListTraitsImpl.h"
23 #include "llvm/Support/ValueHandle.h"
26 //===----------------------------------------------------------------------===//
27 // MDString implementation.
30 MDString::MDString(LLVMContext &C, StringRef S)
31 : MetadataBase(Type::getMetadataTy(C), Value::MDStringVal), Str(S) {}
33 MDString *MDString::get(LLVMContext &Context, StringRef Str) {
34 LLVMContextImpl *pImpl = Context.pImpl;
35 StringMapEntry<MDString *> &Entry =
36 pImpl->MDStringCache.GetOrCreateValue(Str);
37 MDString *&S = Entry.getValue();
38 if (!S) S = new MDString(Context, Entry.getKey());
42 MDString *MDString::get(LLVMContext &Context, const char *Str) {
43 LLVMContextImpl *pImpl = Context.pImpl;
44 StringMapEntry<MDString *> &Entry =
45 pImpl->MDStringCache.GetOrCreateValue(Str ? StringRef(Str) : StringRef());
46 MDString *&S = Entry.getValue();
47 if (!S) S = new MDString(Context, Entry.getKey());
51 //===----------------------------------------------------------------------===//
52 // MDNodeOperand implementation.
55 // Use CallbackVH to hold MDNode operands.
57 class MDNodeOperand : public CallbackVH {
60 MDNodeOperand(Value *V, MDNode *P) : CallbackVH(V), Parent(P) {}
67 virtual void deleted();
68 virtual void allUsesReplacedWith(Value *NV);
70 } // end namespace llvm.
73 void MDNodeOperand::deleted() {
74 Parent->replaceOperand(this, 0);
77 void MDNodeOperand::allUsesReplacedWith(Value *NV) {
78 Parent->replaceOperand(this, NV);
83 //===----------------------------------------------------------------------===//
84 // MDNode implementation.
87 /// getOperandPtr - Helper function to get the MDNodeOperand's coallocated on
88 /// the end of the MDNode.
89 static MDNodeOperand *getOperandPtr(MDNode *N, unsigned Op) {
90 assert(Op < N->getNumOperands() && "Invalid operand number");
91 return reinterpret_cast<MDNodeOperand*>(N+1)+Op;
94 MDNode::MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
96 : MetadataBase(Type::getMetadataTy(C), Value::MDNodeVal) {
97 NumOperands = NumVals;
100 setValueSubclassData(getSubclassDataFromValue() | FunctionLocalBit);
102 // Initialize the operand list, which is co-allocated on the end of the node.
103 for (MDNodeOperand *Op = getOperandPtr(this, 0), *E = Op+NumOperands;
104 Op != E; ++Op, ++Vals)
105 new (Op) MDNodeOperand(*Vals, this);
109 /// ~MDNode - Destroy MDNode.
111 assert((getSubclassDataFromValue() & DestroyFlag) != 0 &&
112 "Not being destroyed through destroy()?");
113 if (!isNotUniqued()) {
114 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
115 pImpl->MDNodeSet.RemoveNode(this);
118 // Destroy the operands.
119 for (MDNodeOperand *Op = getOperandPtr(this, 0), *E = Op+NumOperands;
121 Op->~MDNodeOperand();
124 static const Function *getFunctionForValue(Value *V) {
125 assert(!isa<MDNode>(V) && "does not iterate over metadata operands");
127 if (Instruction *I = dyn_cast<Instruction>(V))
128 return I->getParent()->getParent();
129 if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) return BB->getParent();
130 if (Argument *A = dyn_cast<Argument>(V)) return A->getParent();
135 static const Function *assertLocalFunction(const MDNode *N) {
136 if (!N->isFunctionLocal()) return NULL;
138 const Function *F = NULL, *NewF = NULL;
139 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
140 if (Value *V = N->getOperand(i)) {
141 if (MDNode *MD = dyn_cast<MDNode>(V)) NewF = assertLocalFunction(MD);
142 else NewF = getFunctionForValue(V);
144 if (F && NewF) assert(F == NewF && "inconsistent function-local metadata");
145 else if (!F) F = NewF;
151 // getFunction - If this metadata is function-local and recursively has a
152 // function-local operand, return the first such operand's parent function.
153 // Otherwise, return null. getFunction() should not be used for performance-
154 // critical code because it recursively visits all the MDNode's operands.
155 const Function *MDNode::getFunction() const {
157 return assertLocalFunction(this);
159 if (!isFunctionLocal()) return NULL;
161 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
162 if (Value *V = getOperand(i)) {
163 if (MDNode *MD = dyn_cast<MDNode>(V)) {
164 if (const Function *F = MD->getFunction()) return F;
166 return getFunctionForValue(V);
173 // destroy - Delete this node. Only when there are no uses.
174 void MDNode::destroy() {
175 setValueSubclassData(getSubclassDataFromValue() | DestroyFlag);
176 // Placement delete, the free the memory.
181 MDNode *MDNode::getMDNode(LLVMContext &Context, Value *const *Vals,
182 unsigned NumVals, FunctionLocalness FL) {
183 LLVMContextImpl *pImpl = Context.pImpl;
185 for (unsigned i = 0; i != NumVals; ++i)
186 ID.AddPointer(Vals[i]);
189 MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
191 bool isFunctionLocal = false;
194 for (unsigned i = 0; i != NumVals; ++i) {
197 if (isa<Instruction>(V) || isa<Argument>(V) || isa<BasicBlock>(V) ||
198 (isa<MDNode>(V) && cast<MDNode>(V)->isFunctionLocal())) {
199 isFunctionLocal = true;
205 isFunctionLocal = false;
208 isFunctionLocal = true;
212 // Coallocate space for the node and Operands together, then placement new.
213 void *Ptr = malloc(sizeof(MDNode)+NumVals*sizeof(MDNodeOperand));
214 N = new (Ptr) MDNode(Context, Vals, NumVals, isFunctionLocal);
216 // InsertPoint will have been set by the FindNodeOrInsertPos call.
217 pImpl->MDNodeSet.InsertNode(N, InsertPoint);
222 MDNode *MDNode::get(LLVMContext &Context, Value*const* Vals, unsigned NumVals) {
223 return getMDNode(Context, Vals, NumVals, FL_Unknown);
226 MDNode *MDNode::getWhenValsUnresolved(LLVMContext &Context, Value*const* Vals,
227 unsigned NumVals, bool isFunctionLocal) {
228 return getMDNode(Context, Vals, NumVals, isFunctionLocal ? FL_Yes : FL_No);
231 /// getOperand - Return specified operand.
232 Value *MDNode::getOperand(unsigned i) const {
233 return *getOperandPtr(const_cast<MDNode*>(this), i);
236 void MDNode::Profile(FoldingSetNodeID &ID) const {
237 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
238 ID.AddPointer(getOperand(i));
242 // Replace value from this node's operand list.
243 void MDNode::replaceOperand(MDNodeOperand *Op, Value *To) {
249 // Update the operand.
252 // If this node is already not being uniqued (because one of the operands
253 // already went to null), then there is nothing else to do here.
254 if (isNotUniqued()) return;
256 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
258 // Remove "this" from the context map. FoldingSet doesn't have to reprofile
259 // this node to remove it, so we don't care what state the operands are in.
260 pImpl->MDNodeSet.RemoveNode(this);
262 // If we are dropping an argument to null, we choose to not unique the MDNode
263 // anymore. This commonly occurs during destruction, and uniquing these
264 // brings little reuse.
270 // Now that the node is out of the folding set, get ready to reinsert it.
271 // First, check to see if another node with the same operands already exists
272 // in the set. If it doesn't exist, this returns the position to insert it.
276 MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
279 N->replaceAllUsesWith(this);
281 N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
282 assert(N == 0 && "shouldn't be in the map now!"); (void)N;
285 // InsertPoint will have been set by the FindNodeOrInsertPos call.
286 pImpl->MDNodeSet.InsertNode(this, InsertPoint);
289 //===----------------------------------------------------------------------===//
290 // NamedMDNode implementation.
294 // SymbolTableListTraits specialization for MDSymbolTable.
295 void ilist_traits<NamedMDNode>
296 ::addNodeToList(NamedMDNode *N) {
297 assert(N->getParent() == 0 && "Value already in a container!!");
298 Module *Owner = getListOwner();
300 MDSymbolTable &ST = Owner->getMDSymbolTable();
301 ST.insert(N->getName(), N);
304 void ilist_traits<NamedMDNode>::removeNodeFromList(NamedMDNode *N) {
306 Module *Owner = getListOwner();
307 MDSymbolTable &ST = Owner->getMDSymbolTable();
308 ST.remove(N->getName());
312 static SmallVector<WeakVH, 4> &getNMDOps(void *Operands) {
313 return *(SmallVector<WeakVH, 4>*)Operands;
316 NamedMDNode::NamedMDNode(LLVMContext &C, const Twine &N,
318 unsigned NumMDs, Module *ParentModule)
319 : Value(Type::getMetadataTy(C), Value::NamedMDNodeVal), Parent(0) {
321 Operands = new SmallVector<WeakVH, 4>();
323 SmallVector<WeakVH, 4> &Node = getNMDOps(Operands);
324 for (unsigned i = 0; i != NumMDs; ++i)
325 Node.push_back(WeakVH(MDs[i]));
328 ParentModule->getNamedMDList().push_back(this);
331 NamedMDNode *NamedMDNode::Create(const NamedMDNode *NMD, Module *M) {
332 assert(NMD && "Invalid source NamedMDNode!");
333 SmallVector<MDNode *, 4> Elems;
334 Elems.reserve(NMD->getNumOperands());
336 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
337 Elems.push_back(NMD->getOperand(i));
338 return new NamedMDNode(NMD->getContext(), NMD->getName().data(),
339 Elems.data(), Elems.size(), M);
342 NamedMDNode::~NamedMDNode() {
344 delete &getNMDOps(Operands);
347 /// getNumOperands - Return number of NamedMDNode operands.
348 unsigned NamedMDNode::getNumOperands() const {
349 return (unsigned)getNMDOps(Operands).size();
352 /// getOperand - Return specified operand.
353 MDNode *NamedMDNode::getOperand(unsigned i) const {
354 assert(i < getNumOperands() && "Invalid Operand number!");
355 return dyn_cast_or_null<MDNode>(getNMDOps(Operands)[i]);
358 /// addOperand - Add metadata Operand.
359 void NamedMDNode::addOperand(MDNode *M) {
360 getNMDOps(Operands).push_back(WeakVH(M));
363 /// eraseFromParent - Drop all references and remove the node from parent
365 void NamedMDNode::eraseFromParent() {
366 getParent()->getNamedMDList().erase(this);
369 /// dropAllReferences - Remove all uses and clear node vector.
370 void NamedMDNode::dropAllReferences() {
371 getNMDOps(Operands).clear();
374 /// setName - Set the name of this named metadata.
375 void NamedMDNode::setName(const Twine &NewName) {
376 assert (!NewName.isTriviallyEmpty() && "Invalid named metadata name!");
378 SmallString<256> NameData;
379 StringRef NameRef = NewName.toStringRef(NameData);
381 // Name isn't changing?
382 if (getName() == NameRef)
385 Name = NameRef.str();
387 Parent->getMDSymbolTable().insert(NameRef, this);
390 /// getName - Return a constant reference to this named metadata's name.
391 StringRef NamedMDNode::getName() const {
392 return StringRef(Name);
395 //===----------------------------------------------------------------------===//
396 // LLVMContext MDKind naming implementation.
400 /// isValidName - Return true if Name is a valid custom metadata handler name.
401 static bool isValidName(StringRef MDName) {
405 if (!isalpha(MDName[0]))
408 for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
410 if (!isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
417 /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
418 unsigned LLVMContext::getMDKindID(StringRef Name) const {
419 assert(isValidName(Name) && "Invalid MDNode name");
421 unsigned &Entry = pImpl->CustomMDKindNames[Name];
423 // If this is new, assign it its ID.
424 if (Entry == 0) Entry = pImpl->CustomMDKindNames.size();
428 /// getHandlerNames - Populate client supplied smallvector using custome
429 /// metadata name and ID.
430 void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
431 Names.resize(pImpl->CustomMDKindNames.size()+1);
433 for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
434 E = pImpl->CustomMDKindNames.end(); I != E; ++I)
435 // MD Handlers are numbered from 1.
436 Names[I->second] = I->first();
439 //===----------------------------------------------------------------------===//
440 // Instruction Metadata method implementations.
443 void Instruction::setMetadata(const char *Kind, MDNode *Node) {
444 if (Node == 0 && !hasMetadata()) return;
445 setMetadata(getContext().getMDKindID(Kind), Node);
448 MDNode *Instruction::getMetadataImpl(const char *Kind) const {
449 return getMetadataImpl(getContext().getMDKindID(Kind));
452 /// setMetadata - Set the metadata of of the specified kind to the specified
453 /// node. This updates/replaces metadata if already present, or removes it if
455 void Instruction::setMetadata(unsigned KindID, MDNode *Node) {
456 if (Node == 0 && !hasMetadata()) return;
458 // Handle the case when we're adding/updating metadata on an instruction.
460 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
461 assert(!Info.empty() == hasMetadata() && "HasMetadata bit is wonked");
463 setHasMetadata(true);
465 // Handle replacement of an existing value.
466 for (unsigned i = 0, e = Info.size(); i != e; ++i)
467 if (Info[i].first == KindID) {
468 Info[i].second = Node;
473 // No replacement, just add it to the list.
474 Info.push_back(std::make_pair(KindID, Node));
478 // Otherwise, we're removing metadata from an instruction.
479 assert(hasMetadata() && getContext().pImpl->MetadataStore.count(this) &&
480 "HasMetadata bit out of date!");
481 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
483 // Common case is removing the only entry.
484 if (Info.size() == 1 && Info[0].first == KindID) {
485 getContext().pImpl->MetadataStore.erase(this);
486 setHasMetadata(false);
490 // Handle replacement of an existing value.
491 for (unsigned i = 0, e = Info.size(); i != e; ++i)
492 if (Info[i].first == KindID) {
493 Info[i] = Info.back();
495 assert(!Info.empty() && "Removing last entry should be handled above");
498 // Otherwise, removing an entry that doesn't exist on the instruction.
501 MDNode *Instruction::getMetadataImpl(unsigned KindID) const {
502 LLVMContextImpl::MDMapTy &Info = getContext().pImpl->MetadataStore[this];
503 assert(hasMetadata() && !Info.empty() && "Shouldn't have called this");
505 for (LLVMContextImpl::MDMapTy::iterator I = Info.begin(), E = Info.end();
507 if (I->first == KindID)
512 void Instruction::getAllMetadataImpl(SmallVectorImpl<std::pair<unsigned,
513 MDNode*> > &Result)const {
514 assert(hasMetadata() && getContext().pImpl->MetadataStore.count(this) &&
515 "Shouldn't have called this");
516 const LLVMContextImpl::MDMapTy &Info =
517 getContext().pImpl->MetadataStore.find(this)->second;
518 assert(!Info.empty() && "Shouldn't have called this");
521 Result.append(Info.begin(), Info.end());
523 // Sort the resulting array so it is stable.
524 if (Result.size() > 1)
525 array_pod_sort(Result.begin(), Result.end());
528 /// removeAllMetadata - Remove all metadata from this instruction.
529 void Instruction::removeAllMetadata() {
530 assert(hasMetadata() && "Caller should check");
531 getContext().pImpl->MetadataStore.erase(this);
532 setHasMetadata(false);