1 //===-- ValueEnumerator.cpp - Number values and types for bitcode writer --===//
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 ValueEnumerator class.
12 //===----------------------------------------------------------------------===//
14 #include "ValueEnumerator.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/ADT/SmallPtrSet.h"
17 #include "llvm/IR/Constants.h"
18 #include "llvm/IR/DerivedTypes.h"
19 #include "llvm/IR/Instructions.h"
20 #include "llvm/IR/Module.h"
21 #include "llvm/IR/UseListOrder.h"
22 #include "llvm/IR/ValueSymbolTable.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/raw_ostream.h"
30 DenseMap<const Value *, std::pair<unsigned, bool>> IDs;
31 unsigned LastGlobalConstantID;
32 unsigned LastGlobalValueID;
34 OrderMap() : LastGlobalConstantID(0), LastGlobalValueID(0) {}
36 bool isGlobalConstant(unsigned ID) const {
37 return ID <= LastGlobalConstantID;
39 bool isGlobalValue(unsigned ID) const {
40 return ID <= LastGlobalValueID && !isGlobalConstant(ID);
43 unsigned size() const { return IDs.size(); }
44 std::pair<unsigned, bool> &operator[](const Value *V) { return IDs[V]; }
45 std::pair<unsigned, bool> lookup(const Value *V) const {
48 void index(const Value *V) {
49 // Explicitly sequence get-size and insert-value operations to avoid UB.
50 unsigned ID = IDs.size() + 1;
56 static void orderValue(const Value *V, OrderMap &OM) {
57 if (OM.lookup(V).first)
60 if (const Constant *C = dyn_cast<Constant>(V))
61 if (C->getNumOperands() && !isa<GlobalValue>(C))
62 for (const Value *Op : C->operands())
63 if (!isa<BasicBlock>(Op) && !isa<GlobalValue>(Op))
66 // Note: we cannot cache this lookup above, since inserting into the map
67 // changes the map's size, and thus affects the other IDs.
71 static OrderMap orderModule(const Module *M) {
72 // This needs to match the order used by ValueEnumerator::ValueEnumerator()
73 // and ValueEnumerator::incorporateFunction().
76 // In the reader, initializers of GlobalValues are set *after* all the
77 // globals have been read. Rather than awkwardly modeling this behaviour
78 // directly in predictValueUseListOrderImpl(), just assign IDs to
79 // initializers of GlobalValues before GlobalValues themselves to model this
81 for (const GlobalVariable &G : M->globals())
82 if (G.hasInitializer())
83 if (!isa<GlobalValue>(G.getInitializer()))
84 orderValue(G.getInitializer(), OM);
85 for (const GlobalAlias &A : M->aliases())
86 if (!isa<GlobalValue>(A.getAliasee()))
87 orderValue(A.getAliasee(), OM);
88 for (const Function &F : *M)
89 if (F.hasPrefixData())
90 if (!isa<GlobalValue>(F.getPrefixData()))
91 orderValue(F.getPrefixData(), OM);
92 OM.LastGlobalConstantID = OM.size();
94 // Initializers of GlobalValues are processed in
95 // BitcodeReader::ResolveGlobalAndAliasInits(). Match the order there rather
96 // than ValueEnumerator, and match the code in predictValueUseListOrderImpl()
97 // by giving IDs in reverse order.
99 // Since GlobalValues never reference each other directly (just through
100 // initializers), their relative IDs only matter for determining order of
101 // uses in their initializers.
102 for (const Function &F : *M)
104 for (const GlobalAlias &A : M->aliases())
106 for (const GlobalVariable &G : M->globals())
108 OM.LastGlobalValueID = OM.size();
110 for (const Function &F : *M) {
111 if (F.isDeclaration())
113 // Here we need to match the union of ValueEnumerator::incorporateFunction()
114 // and WriteFunction(). Basic blocks are implicitly declared before
115 // anything else (by declaring their size).
116 for (const BasicBlock &BB : F)
118 for (const Argument &A : F.args())
120 for (const BasicBlock &BB : F)
121 for (const Instruction &I : BB)
122 for (const Value *Op : I.operands())
123 if ((isa<Constant>(*Op) && !isa<GlobalValue>(*Op)) ||
126 for (const BasicBlock &BB : F)
127 for (const Instruction &I : BB)
133 static void predictValueUseListOrderImpl(const Value *V, const Function *F,
134 unsigned ID, const OrderMap &OM,
135 UseListOrderStack &Stack) {
136 // Predict use-list order for this one.
137 typedef std::pair<const Use *, unsigned> Entry;
138 SmallVector<Entry, 64> List;
139 for (const Use &U : V->uses())
140 // Check if this user will be serialized.
141 if (OM.lookup(U.getUser()).first)
142 List.push_back(std::make_pair(&U, List.size()));
145 // We may have lost some users.
148 bool IsGlobalValue = OM.isGlobalValue(ID);
149 std::sort(List.begin(), List.end(), [&](const Entry &L, const Entry &R) {
150 const Use *LU = L.first;
151 const Use *RU = R.first;
155 auto LID = OM.lookup(LU->getUser()).first;
156 auto RID = OM.lookup(RU->getUser()).first;
158 // Global values are processed in reverse order.
160 // Moreover, initializers of GlobalValues are set *after* all the globals
161 // have been read (despite having earlier IDs). Rather than awkwardly
162 // modeling this behaviour here, orderModule() has assigned IDs to
163 // initializers of GlobalValues before GlobalValues themselves.
164 if (OM.isGlobalValue(LID) && OM.isGlobalValue(RID))
167 // If ID is 4, then expect: 7 6 5 1 2 3.
170 if (!IsGlobalValue) // GlobalValue uses don't get reversed.
176 if (!IsGlobalValue) // GlobalValue uses don't get reversed.
181 // LID and RID are equal, so we have different operands of the same user.
182 // Assume operands are added in order for all instructions.
184 if (!IsGlobalValue) // GlobalValue uses don't get reversed.
185 return LU->getOperandNo() < RU->getOperandNo();
186 return LU->getOperandNo() > RU->getOperandNo();
190 List.begin(), List.end(),
191 [](const Entry &L, const Entry &R) { return L.second < R.second; }))
192 // Order is already correct.
195 // Store the shuffle.
196 Stack.emplace_back(V, F, List.size());
197 assert(List.size() == Stack.back().Shuffle.size() && "Wrong size");
198 for (size_t I = 0, E = List.size(); I != E; ++I)
199 Stack.back().Shuffle[I] = List[I].second;
202 static void predictValueUseListOrder(const Value *V, const Function *F,
203 OrderMap &OM, UseListOrderStack &Stack) {
204 auto &IDPair = OM[V];
205 assert(IDPair.first && "Unmapped value");
207 // Already predicted.
210 // Do the actual prediction.
211 IDPair.second = true;
212 if (!V->use_empty() && std::next(V->use_begin()) != V->use_end())
213 predictValueUseListOrderImpl(V, F, IDPair.first, OM, Stack);
215 // Recursive descent into constants.
216 if (const Constant *C = dyn_cast<Constant>(V))
217 if (C->getNumOperands()) // Visit GlobalValues.
218 for (const Value *Op : C->operands())
219 if (isa<Constant>(Op)) // Visit GlobalValues.
220 predictValueUseListOrder(Op, F, OM, Stack);
223 static UseListOrderStack predictUseListOrder(const Module *M) {
224 OrderMap OM = orderModule(M);
226 // Use-list orders need to be serialized after all the users have been added
227 // to a value, or else the shuffles will be incomplete. Store them per
228 // function in a stack.
230 // Aside from function order, the order of values doesn't matter much here.
231 UseListOrderStack Stack;
233 // We want to visit the functions backward now so we can list function-local
234 // constants in the last Function they're used in. Module-level constants
235 // have already been visited above.
236 for (auto I = M->rbegin(), E = M->rend(); I != E; ++I) {
237 const Function &F = *I;
238 if (F.isDeclaration())
240 for (const BasicBlock &BB : F)
241 predictValueUseListOrder(&BB, &F, OM, Stack);
242 for (const Argument &A : F.args())
243 predictValueUseListOrder(&A, &F, OM, Stack);
244 for (const BasicBlock &BB : F)
245 for (const Instruction &I : BB)
246 for (const Value *Op : I.operands())
247 if (isa<Constant>(*Op) || isa<InlineAsm>(*Op)) // Visit GlobalValues.
248 predictValueUseListOrder(Op, &F, OM, Stack);
249 for (const BasicBlock &BB : F)
250 for (const Instruction &I : BB)
251 predictValueUseListOrder(&I, &F, OM, Stack);
254 // Visit globals last, since the module-level use-list block will be seen
255 // before the function bodies are processed.
256 for (const GlobalVariable &G : M->globals())
257 predictValueUseListOrder(&G, nullptr, OM, Stack);
258 for (const Function &F : *M)
259 predictValueUseListOrder(&F, nullptr, OM, Stack);
260 for (const GlobalAlias &A : M->aliases())
261 predictValueUseListOrder(&A, nullptr, OM, Stack);
262 for (const GlobalVariable &G : M->globals())
263 if (G.hasInitializer())
264 predictValueUseListOrder(G.getInitializer(), nullptr, OM, Stack);
265 for (const GlobalAlias &A : M->aliases())
266 predictValueUseListOrder(A.getAliasee(), nullptr, OM, Stack);
267 for (const Function &F : *M)
268 if (F.hasPrefixData())
269 predictValueUseListOrder(F.getPrefixData(), nullptr, OM, Stack);
274 static bool isIntOrIntVectorValue(const std::pair<const Value*, unsigned> &V) {
275 return V.first->getType()->isIntOrIntVectorTy();
278 /// ValueEnumerator - Enumerate module-level information.
279 ValueEnumerator::ValueEnumerator(const Module *M) {
280 if (shouldPreserveBitcodeUseListOrder())
281 UseListOrders = predictUseListOrder(M);
283 // Enumerate the global variables.
284 for (Module::const_global_iterator I = M->global_begin(),
286 E = M->global_end(); I != E; ++I)
289 // Enumerate the functions.
290 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
292 EnumerateAttributes(cast<Function>(I)->getAttributes());
295 // Enumerate the aliases.
296 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
300 // Remember what is the cutoff between globalvalue's and other constants.
301 unsigned FirstConstant = Values.size();
303 // Enumerate the global variable initializers.
304 for (Module::const_global_iterator I = M->global_begin(),
305 E = M->global_end(); I != E; ++I)
306 if (I->hasInitializer())
307 EnumerateValue(I->getInitializer());
309 // Enumerate the aliasees.
310 for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
312 EnumerateValue(I->getAliasee());
314 // Enumerate the prefix data constants.
315 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
316 if (I->hasPrefixData())
317 EnumerateValue(I->getPrefixData());
319 // Insert constants and metadata that are named at module level into the slot
320 // pool so that the module symbol table can refer to them...
321 EnumerateValueSymbolTable(M->getValueSymbolTable());
322 EnumerateNamedMetadata(M);
324 SmallVector<std::pair<unsigned, MDNode*>, 8> MDs;
326 // Enumerate types used by function bodies and argument lists.
327 for (const Function &F : *M) {
328 for (const Argument &A : F.args())
329 EnumerateType(A.getType());
331 for (const BasicBlock &BB : F)
332 for (const Instruction &I : BB) {
333 for (const Use &Op : I.operands()) {
334 if (MDNode *MD = dyn_cast<MDNode>(&Op))
335 if (MD->isFunctionLocal() && MD->getFunction())
336 // These will get enumerated during function-incorporation.
338 EnumerateOperandType(Op);
340 EnumerateType(I.getType());
341 if (const CallInst *CI = dyn_cast<CallInst>(&I))
342 EnumerateAttributes(CI->getAttributes());
343 else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I))
344 EnumerateAttributes(II->getAttributes());
346 // Enumerate metadata attached with this instruction.
348 I.getAllMetadataOtherThanDebugLoc(MDs);
349 for (unsigned i = 0, e = MDs.size(); i != e; ++i)
350 EnumerateMetadata(MDs[i].second);
352 if (!I.getDebugLoc().isUnknown()) {
354 I.getDebugLoc().getScopeAndInlinedAt(Scope, IA, I.getContext());
355 if (Scope) EnumerateMetadata(Scope);
356 if (IA) EnumerateMetadata(IA);
361 // Optimize constant ordering.
362 OptimizeConstants(FirstConstant, Values.size());
365 unsigned ValueEnumerator::getInstructionID(const Instruction *Inst) const {
366 InstructionMapType::const_iterator I = InstructionMap.find(Inst);
367 assert(I != InstructionMap.end() && "Instruction is not mapped!");
371 unsigned ValueEnumerator::getComdatID(const Comdat *C) const {
372 unsigned ComdatID = Comdats.idFor(C);
373 assert(ComdatID && "Comdat not found!");
377 void ValueEnumerator::setInstructionID(const Instruction *I) {
378 InstructionMap[I] = InstructionCount++;
381 unsigned ValueEnumerator::getValueID(const Value *V) const {
382 if (isa<MDNode>(V) || isa<MDString>(V)) {
383 ValueMapType::const_iterator I = MDValueMap.find(V);
384 assert(I != MDValueMap.end() && "Value not in slotcalculator!");
388 ValueMapType::const_iterator I = ValueMap.find(V);
389 assert(I != ValueMap.end() && "Value not in slotcalculator!");
393 void ValueEnumerator::dump() const {
394 print(dbgs(), ValueMap, "Default");
396 print(dbgs(), MDValueMap, "MetaData");
400 void ValueEnumerator::print(raw_ostream &OS, const ValueMapType &Map,
401 const char *Name) const {
403 OS << "Map Name: " << Name << "\n";
404 OS << "Size: " << Map.size() << "\n";
405 for (ValueMapType::const_iterator I = Map.begin(),
406 E = Map.end(); I != E; ++I) {
408 const Value *V = I->first;
410 OS << "Value: " << V->getName();
412 OS << "Value: [null]\n";
415 OS << " Uses(" << std::distance(V->use_begin(),V->use_end()) << "):";
416 for (const Use &U : V->uses()) {
417 if (&U != &*V->use_begin())
420 OS << " " << U->getName();
429 /// OptimizeConstants - Reorder constant pool for denser encoding.
430 void ValueEnumerator::OptimizeConstants(unsigned CstStart, unsigned CstEnd) {
431 if (CstStart == CstEnd || CstStart+1 == CstEnd) return;
433 if (shouldPreserveBitcodeUseListOrder())
434 // Optimizing constants makes the use-list order difficult to predict.
435 // Disable it for now when trying to preserve the order.
438 std::stable_sort(Values.begin() + CstStart, Values.begin() + CstEnd,
439 [this](const std::pair<const Value *, unsigned> &LHS,
440 const std::pair<const Value *, unsigned> &RHS) {
442 if (LHS.first->getType() != RHS.first->getType())
443 return getTypeID(LHS.first->getType()) < getTypeID(RHS.first->getType());
444 // Then by frequency.
445 return LHS.second > RHS.second;
448 // Ensure that integer and vector of integer constants are at the start of the
449 // constant pool. This is important so that GEP structure indices come before
450 // gep constant exprs.
451 std::partition(Values.begin()+CstStart, Values.begin()+CstEnd,
452 isIntOrIntVectorValue);
454 // Rebuild the modified portion of ValueMap.
455 for (; CstStart != CstEnd; ++CstStart)
456 ValueMap[Values[CstStart].first] = CstStart+1;
460 /// EnumerateValueSymbolTable - Insert all of the values in the specified symbol
461 /// table into the values table.
462 void ValueEnumerator::EnumerateValueSymbolTable(const ValueSymbolTable &VST) {
463 for (ValueSymbolTable::const_iterator VI = VST.begin(), VE = VST.end();
465 EnumerateValue(VI->getValue());
468 /// EnumerateNamedMetadata - Insert all of the values referenced by
469 /// named metadata in the specified module.
470 void ValueEnumerator::EnumerateNamedMetadata(const Module *M) {
471 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
472 E = M->named_metadata_end(); I != E; ++I)
473 EnumerateNamedMDNode(I);
476 void ValueEnumerator::EnumerateNamedMDNode(const NamedMDNode *MD) {
477 for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i)
478 EnumerateMetadata(MD->getOperand(i));
481 /// EnumerateMDNodeOperands - Enumerate all non-function-local values
482 /// and types referenced by the given MDNode.
483 void ValueEnumerator::EnumerateMDNodeOperands(const MDNode *N) {
484 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
485 if (Value *V = N->getOperand(i)) {
486 if (isa<MDNode>(V) || isa<MDString>(V))
487 EnumerateMetadata(V);
488 else if (!isa<Instruction>(V) && !isa<Argument>(V))
491 EnumerateType(Type::getVoidTy(N->getContext()));
495 void ValueEnumerator::EnumerateMetadata(const Value *MD) {
496 assert((isa<MDNode>(MD) || isa<MDString>(MD)) && "Invalid metadata kind");
498 // Enumerate the type of this value.
499 EnumerateType(MD->getType());
501 const MDNode *N = dyn_cast<MDNode>(MD);
503 // In the module-level pass, skip function-local nodes themselves, but
504 // do walk their operands.
505 if (N && N->isFunctionLocal() && N->getFunction()) {
506 EnumerateMDNodeOperands(N);
510 // Check to see if it's already in!
511 unsigned &MDValueID = MDValueMap[MD];
513 // Increment use count.
514 MDValues[MDValueID-1].second++;
517 MDValues.push_back(std::make_pair(MD, 1U));
518 MDValueID = MDValues.size();
520 // Enumerate all non-function-local operands.
522 EnumerateMDNodeOperands(N);
525 /// EnumerateFunctionLocalMetadataa - Incorporate function-local metadata
526 /// information reachable from the given MDNode.
527 void ValueEnumerator::EnumerateFunctionLocalMetadata(const MDNode *N) {
528 assert(N->isFunctionLocal() && N->getFunction() &&
529 "EnumerateFunctionLocalMetadata called on non-function-local mdnode!");
531 // Enumerate the type of this value.
532 EnumerateType(N->getType());
534 // Check to see if it's already in!
535 unsigned &MDValueID = MDValueMap[N];
537 // Increment use count.
538 MDValues[MDValueID-1].second++;
541 MDValues.push_back(std::make_pair(N, 1U));
542 MDValueID = MDValues.size();
544 // To incoroporate function-local information visit all function-local
545 // MDNodes and all function-local values they reference.
546 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
547 if (Value *V = N->getOperand(i)) {
548 if (MDNode *O = dyn_cast<MDNode>(V)) {
549 if (O->isFunctionLocal() && O->getFunction())
550 EnumerateFunctionLocalMetadata(O);
551 } else if (isa<Instruction>(V) || isa<Argument>(V))
555 // Also, collect all function-local MDNodes for easy access.
556 FunctionLocalMDs.push_back(N);
559 void ValueEnumerator::EnumerateValue(const Value *V) {
560 assert(!V->getType()->isVoidTy() && "Can't insert void values!");
561 assert(!isa<MDNode>(V) && !isa<MDString>(V) &&
562 "EnumerateValue doesn't handle Metadata!");
564 // Check to see if it's already in!
565 unsigned &ValueID = ValueMap[V];
567 // Increment use count.
568 Values[ValueID-1].second++;
572 if (auto *GO = dyn_cast<GlobalObject>(V))
573 if (const Comdat *C = GO->getComdat())
576 // Enumerate the type of this value.
577 EnumerateType(V->getType());
579 if (const Constant *C = dyn_cast<Constant>(V)) {
580 if (isa<GlobalValue>(C)) {
581 // Initializers for globals are handled explicitly elsewhere.
582 } else if (C->getNumOperands()) {
583 // If a constant has operands, enumerate them. This makes sure that if a
584 // constant has uses (for example an array of const ints), that they are
587 // We prefer to enumerate them with values before we enumerate the user
588 // itself. This makes it more likely that we can avoid forward references
589 // in the reader. We know that there can be no cycles in the constants
590 // graph that don't go through a global variable.
591 for (User::const_op_iterator I = C->op_begin(), E = C->op_end();
593 if (!isa<BasicBlock>(*I)) // Don't enumerate BB operand to BlockAddress.
596 // Finally, add the value. Doing this could make the ValueID reference be
597 // dangling, don't reuse it.
598 Values.push_back(std::make_pair(V, 1U));
599 ValueMap[V] = Values.size();
605 Values.push_back(std::make_pair(V, 1U));
606 ValueID = Values.size();
610 void ValueEnumerator::EnumerateType(Type *Ty) {
611 unsigned *TypeID = &TypeMap[Ty];
613 // We've already seen this type.
617 // If it is a non-anonymous struct, mark the type as being visited so that we
618 // don't recursively visit it. This is safe because we allow forward
619 // references of these in the bitcode reader.
620 if (StructType *STy = dyn_cast<StructType>(Ty))
621 if (!STy->isLiteral())
624 // Enumerate all of the subtypes before we enumerate this type. This ensures
625 // that the type will be enumerated in an order that can be directly built.
626 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
630 // Refresh the TypeID pointer in case the table rehashed.
631 TypeID = &TypeMap[Ty];
633 // Check to see if we got the pointer another way. This can happen when
634 // enumerating recursive types that hit the base case deeper than they start.
636 // If this is actually a struct that we are treating as forward ref'able,
637 // then emit the definition now that all of its contents are available.
638 if (*TypeID && *TypeID != ~0U)
641 // Add this type now that its contents are all happily enumerated.
644 *TypeID = Types.size();
647 // Enumerate the types for the specified value. If the value is a constant,
648 // walk through it, enumerating the types of the constant.
649 void ValueEnumerator::EnumerateOperandType(const Value *V) {
650 EnumerateType(V->getType());
652 if (const Constant *C = dyn_cast<Constant>(V)) {
653 // If this constant is already enumerated, ignore it, we know its type must
655 if (ValueMap.count(V)) return;
657 // This constant may have operands, make sure to enumerate the types in
659 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
660 const Value *Op = C->getOperand(i);
662 // Don't enumerate basic blocks here, this happens as operands to
664 if (isa<BasicBlock>(Op)) continue;
666 EnumerateOperandType(Op);
669 if (const MDNode *N = dyn_cast<MDNode>(V)) {
670 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
671 if (Value *Elem = N->getOperand(i))
672 EnumerateOperandType(Elem);
674 } else if (isa<MDString>(V) || isa<MDNode>(V))
675 EnumerateMetadata(V);
678 void ValueEnumerator::EnumerateAttributes(AttributeSet PAL) {
679 if (PAL.isEmpty()) return; // null is always 0.
682 unsigned &Entry = AttributeMap[PAL];
684 // Never saw this before, add it.
685 Attribute.push_back(PAL);
686 Entry = Attribute.size();
689 // Do lookups for all attribute groups.
690 for (unsigned i = 0, e = PAL.getNumSlots(); i != e; ++i) {
691 AttributeSet AS = PAL.getSlotAttributes(i);
692 unsigned &Entry = AttributeGroupMap[AS];
694 AttributeGroups.push_back(AS);
695 Entry = AttributeGroups.size();
700 void ValueEnumerator::incorporateFunction(const Function &F) {
701 InstructionCount = 0;
702 NumModuleValues = Values.size();
703 NumModuleMDValues = MDValues.size();
705 // Adding function arguments to the value table.
706 for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end();
710 FirstFuncConstantID = Values.size();
712 // Add all function-level constants to the value table.
713 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
714 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I)
715 for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
717 if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) ||
721 BasicBlocks.push_back(BB);
722 ValueMap[BB] = BasicBlocks.size();
725 // Optimize the constant layout.
726 OptimizeConstants(FirstFuncConstantID, Values.size());
728 // Add the function's parameter attributes so they are available for use in
729 // the function's instruction.
730 EnumerateAttributes(F.getAttributes());
732 FirstInstID = Values.size();
734 SmallVector<MDNode *, 8> FnLocalMDVector;
735 // Add all of the instructions.
736 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
737 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
738 for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
740 if (MDNode *MD = dyn_cast<MDNode>(*OI))
741 if (MD->isFunctionLocal() && MD->getFunction())
742 // Enumerate metadata after the instructions they might refer to.
743 FnLocalMDVector.push_back(MD);
746 SmallVector<std::pair<unsigned, MDNode*>, 8> MDs;
747 I->getAllMetadataOtherThanDebugLoc(MDs);
748 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
749 MDNode *N = MDs[i].second;
750 if (N->isFunctionLocal() && N->getFunction())
751 FnLocalMDVector.push_back(N);
754 if (!I->getType()->isVoidTy())
759 // Add all of the function-local metadata.
760 for (unsigned i = 0, e = FnLocalMDVector.size(); i != e; ++i)
761 EnumerateFunctionLocalMetadata(FnLocalMDVector[i]);
764 void ValueEnumerator::purgeFunction() {
765 /// Remove purged values from the ValueMap.
766 for (unsigned i = NumModuleValues, e = Values.size(); i != e; ++i)
767 ValueMap.erase(Values[i].first);
768 for (unsigned i = NumModuleMDValues, e = MDValues.size(); i != e; ++i)
769 MDValueMap.erase(MDValues[i].first);
770 for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
771 ValueMap.erase(BasicBlocks[i]);
773 Values.resize(NumModuleValues);
774 MDValues.resize(NumModuleMDValues);
776 FunctionLocalMDs.clear();
779 static void IncorporateFunctionInfoGlobalBBIDs(const Function *F,
780 DenseMap<const BasicBlock*, unsigned> &IDMap) {
781 unsigned Counter = 0;
782 for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
783 IDMap[BB] = ++Counter;
786 /// getGlobalBasicBlockID - This returns the function-specific ID for the
787 /// specified basic block. This is relatively expensive information, so it
788 /// should only be used by rare constructs such as address-of-label.
789 unsigned ValueEnumerator::getGlobalBasicBlockID(const BasicBlock *BB) const {
790 unsigned &Idx = GlobalBasicBlockIDs[BB];
794 IncorporateFunctionInfoGlobalBBIDs(BB->getParent(), GlobalBasicBlockIDs);
795 return getGlobalBasicBlockID(BB);