1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes...
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "ConstantFolding.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/GlobalValue.h"
18 #include "llvm/Instructions.h"
19 #include "llvm/SymbolTable.h"
20 #include "llvm/Module.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/Support/Compiler.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/MathExtras.h"
29 //===----------------------------------------------------------------------===//
31 //===----------------------------------------------------------------------===//
33 void Constant::destroyConstantImpl() {
34 // When a Constant is destroyed, there may be lingering
35 // references to the constant by other constants in the constant pool. These
36 // constants are implicitly dependent on the module that is being deleted,
37 // but they don't know that. Because we only find out when the CPV is
38 // deleted, we must now notify all of our users (that should only be
39 // Constants) that they are, in fact, invalid now and should be deleted.
41 while (!use_empty()) {
42 Value *V = use_back();
43 #ifndef NDEBUG // Only in -g mode...
44 if (!isa<Constant>(V))
45 DOUT << "While deleting: " << *this
46 << "\n\nUse still stuck around after Def is destroyed: "
49 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
50 Constant *CV = cast<Constant>(V);
51 CV->destroyConstant();
53 // The constant should remove itself from our use list...
54 assert((use_empty() || use_back() != V) && "Constant not removed!");
57 // Value has no outstanding references it is safe to delete it now...
61 /// canTrap - Return true if evaluation of this constant could trap. This is
62 /// true for things like constant expressions that could divide by zero.
63 bool Constant::canTrap() const {
64 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
65 // The only thing that could possibly trap are constant exprs.
66 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
67 if (!CE) return false;
69 // ConstantExpr traps if any operands can trap.
70 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
71 if (getOperand(i)->canTrap())
74 // Otherwise, only specific operations can trap.
75 switch (CE->getOpcode()) {
78 case Instruction::UDiv:
79 case Instruction::SDiv:
80 case Instruction::FDiv:
81 case Instruction::URem:
82 case Instruction::SRem:
83 case Instruction::FRem:
84 // Div and rem can trap if the RHS is not known to be non-zero.
85 if (!isa<ConstantInt>(getOperand(1)) || getOperand(1)->isNullValue())
92 // Static constructor to create a '0' constant of arbitrary type...
93 Constant *Constant::getNullValue(const Type *Ty) {
94 switch (Ty->getTypeID()) {
95 case Type::BoolTyID: {
96 static Constant *NullBool = ConstantInt::get(false);
99 case Type::Int8TyID: {
100 static Constant *NullInt8 = ConstantInt::get(Type::Int8Ty, 0);
103 case Type::Int16TyID: {
104 static Constant *NullInt16 = ConstantInt::get(Type::Int16Ty, 0);
107 case Type::Int32TyID: {
108 static Constant *NullInt32 = ConstantInt::get(Type::Int32Ty, 0);
111 case Type::Int64TyID: {
112 static Constant *NullInt64 = ConstantInt::get(Type::Int64Ty, 0);
115 case Type::FloatTyID: {
116 static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
119 case Type::DoubleTyID: {
120 static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
123 case Type::PointerTyID:
124 return ConstantPointerNull::get(cast<PointerType>(Ty));
125 case Type::StructTyID:
126 case Type::ArrayTyID:
127 case Type::PackedTyID:
128 return ConstantAggregateZero::get(Ty);
130 // Function, Label, or Opaque type?
131 assert(!"Cannot create a null constant of that type!");
137 // Static constructor to create an integral constant with all bits set
138 ConstantInt *ConstantInt::getAllOnesValue(const Type *Ty) {
139 switch (Ty->getTypeID()) {
140 case Type::BoolTyID: return ConstantInt::getTrue();
142 case Type::Int16TyID:
143 case Type::Int32TyID:
144 case Type::Int64TyID: return ConstantInt::get(Ty, int64_t(-1));
149 /// @returns the value for an packed integer constant of the given type that
150 /// has all its bits set to true.
151 /// @brief Get the all ones value
152 ConstantPacked *ConstantPacked::getAllOnesValue(const PackedType *Ty) {
153 std::vector<Constant*> Elts;
154 Elts.resize(Ty->getNumElements(),
155 ConstantInt::getAllOnesValue(Ty->getElementType()));
156 assert(Elts[0] && "Not a packed integer type!");
157 return cast<ConstantPacked>(ConstantPacked::get(Elts));
161 //===----------------------------------------------------------------------===//
162 // ConstantXXX Classes
163 //===----------------------------------------------------------------------===//
165 //===----------------------------------------------------------------------===//
166 // Normal Constructors
168 ConstantInt::ConstantInt(bool V)
169 : Constant(Type::BoolTy, ConstantIntVal, 0, 0), Val(uint64_t(V)) {
172 ConstantInt::ConstantInt(const Type *Ty, uint64_t V)
173 : Constant(Ty, ConstantIntVal, 0, 0), Val(Ty == Type::BoolTy ? bool(V) : V) {
176 ConstantFP::ConstantFP(const Type *Ty, double V)
177 : Constant(Ty, ConstantFPVal, 0, 0) {
178 assert(isValueValidForType(Ty, V) && "Value too large for type!");
182 ConstantArray::ConstantArray(const ArrayType *T,
183 const std::vector<Constant*> &V)
184 : Constant(T, ConstantArrayVal, new Use[V.size()], V.size()) {
185 assert(V.size() == T->getNumElements() &&
186 "Invalid initializer vector for constant array");
187 Use *OL = OperandList;
188 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
191 assert((C->getType() == T->getElementType() ||
193 C->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
194 "Initializer for array element doesn't match array element type!");
199 ConstantArray::~ConstantArray() {
200 delete [] OperandList;
203 ConstantStruct::ConstantStruct(const StructType *T,
204 const std::vector<Constant*> &V)
205 : Constant(T, ConstantStructVal, new Use[V.size()], V.size()) {
206 assert(V.size() == T->getNumElements() &&
207 "Invalid initializer vector for constant structure");
208 Use *OL = OperandList;
209 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
212 assert((C->getType() == T->getElementType(I-V.begin()) ||
213 ((T->getElementType(I-V.begin())->isAbstract() ||
214 C->getType()->isAbstract()) &&
215 T->getElementType(I-V.begin())->getTypeID() ==
216 C->getType()->getTypeID())) &&
217 "Initializer for struct element doesn't match struct element type!");
222 ConstantStruct::~ConstantStruct() {
223 delete [] OperandList;
227 ConstantPacked::ConstantPacked(const PackedType *T,
228 const std::vector<Constant*> &V)
229 : Constant(T, ConstantPackedVal, new Use[V.size()], V.size()) {
230 Use *OL = OperandList;
231 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
234 assert((C->getType() == T->getElementType() ||
236 C->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
237 "Initializer for packed element doesn't match packed element type!");
242 ConstantPacked::~ConstantPacked() {
243 delete [] OperandList;
246 // We declare several classes private to this file, so use an anonymous
250 /// UnaryConstantExpr - This class is private to Constants.cpp, and is used
251 /// behind the scenes to implement unary constant exprs.
252 class VISIBILITY_HIDDEN UnaryConstantExpr : public ConstantExpr {
255 UnaryConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
256 : ConstantExpr(Ty, Opcode, &Op, 1), Op(C, this) {}
259 /// BinaryConstantExpr - This class is private to Constants.cpp, and is used
260 /// behind the scenes to implement binary constant exprs.
261 class VISIBILITY_HIDDEN BinaryConstantExpr : public ConstantExpr {
264 BinaryConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
265 : ConstantExpr(C1->getType(), Opcode, Ops, 2) {
266 Ops[0].init(C1, this);
267 Ops[1].init(C2, this);
271 /// SelectConstantExpr - This class is private to Constants.cpp, and is used
272 /// behind the scenes to implement select constant exprs.
273 class VISIBILITY_HIDDEN SelectConstantExpr : public ConstantExpr {
276 SelectConstantExpr(Constant *C1, Constant *C2, Constant *C3)
277 : ConstantExpr(C2->getType(), Instruction::Select, Ops, 3) {
278 Ops[0].init(C1, this);
279 Ops[1].init(C2, this);
280 Ops[2].init(C3, this);
284 /// ExtractElementConstantExpr - This class is private to
285 /// Constants.cpp, and is used behind the scenes to implement
286 /// extractelement constant exprs.
287 class VISIBILITY_HIDDEN ExtractElementConstantExpr : public ConstantExpr {
290 ExtractElementConstantExpr(Constant *C1, Constant *C2)
291 : ConstantExpr(cast<PackedType>(C1->getType())->getElementType(),
292 Instruction::ExtractElement, Ops, 2) {
293 Ops[0].init(C1, this);
294 Ops[1].init(C2, this);
298 /// InsertElementConstantExpr - This class is private to
299 /// Constants.cpp, and is used behind the scenes to implement
300 /// insertelement constant exprs.
301 class VISIBILITY_HIDDEN InsertElementConstantExpr : public ConstantExpr {
304 InsertElementConstantExpr(Constant *C1, Constant *C2, Constant *C3)
305 : ConstantExpr(C1->getType(), Instruction::InsertElement,
307 Ops[0].init(C1, this);
308 Ops[1].init(C2, this);
309 Ops[2].init(C3, this);
313 /// ShuffleVectorConstantExpr - This class is private to
314 /// Constants.cpp, and is used behind the scenes to implement
315 /// shufflevector constant exprs.
316 class VISIBILITY_HIDDEN ShuffleVectorConstantExpr : public ConstantExpr {
319 ShuffleVectorConstantExpr(Constant *C1, Constant *C2, Constant *C3)
320 : ConstantExpr(C1->getType(), Instruction::ShuffleVector,
322 Ops[0].init(C1, this);
323 Ops[1].init(C2, this);
324 Ops[2].init(C3, this);
328 /// GetElementPtrConstantExpr - This class is private to Constants.cpp, and is
329 /// used behind the scenes to implement getelementpr constant exprs.
330 struct VISIBILITY_HIDDEN GetElementPtrConstantExpr : public ConstantExpr {
331 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
333 : ConstantExpr(DestTy, Instruction::GetElementPtr,
334 new Use[IdxList.size()+1], IdxList.size()+1) {
335 OperandList[0].init(C, this);
336 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
337 OperandList[i+1].init(IdxList[i], this);
339 ~GetElementPtrConstantExpr() {
340 delete [] OperandList;
344 // CompareConstantExpr - This class is private to Constants.cpp, and is used
345 // behind the scenes to implement ICmp and FCmp constant expressions. This is
346 // needed in order to store the predicate value for these instructions.
347 struct VISIBILITY_HIDDEN CompareConstantExpr : public ConstantExpr {
348 unsigned short predicate;
350 CompareConstantExpr(Instruction::OtherOps opc, unsigned short pred,
351 Constant* LHS, Constant* RHS)
352 : ConstantExpr(Type::BoolTy, opc, Ops, 2), predicate(pred) {
353 OperandList[0].init(LHS, this);
354 OperandList[1].init(RHS, this);
358 } // end anonymous namespace
361 // Utility function for determining if a ConstantExpr is a CastOp or not. This
362 // can't be inline because we don't want to #include Instruction.h into
364 bool ConstantExpr::isCast() const {
365 return Instruction::isCast(getOpcode());
368 bool ConstantExpr::isCompare() const {
369 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
372 /// ConstantExpr::get* - Return some common constants without having to
373 /// specify the full Instruction::OPCODE identifier.
375 Constant *ConstantExpr::getNeg(Constant *C) {
376 if (!C->getType()->isFloatingPoint())
377 return get(Instruction::Sub, getNullValue(C->getType()), C);
379 return get(Instruction::Sub, ConstantFP::get(C->getType(), -0.0), C);
381 Constant *ConstantExpr::getNot(Constant *C) {
382 assert(isa<ConstantInt>(C) && "Cannot NOT a nonintegral type!");
383 return get(Instruction::Xor, C,
384 ConstantInt::getAllOnesValue(C->getType()));
386 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2) {
387 return get(Instruction::Add, C1, C2);
389 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2) {
390 return get(Instruction::Sub, C1, C2);
392 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2) {
393 return get(Instruction::Mul, C1, C2);
395 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2) {
396 return get(Instruction::UDiv, C1, C2);
398 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2) {
399 return get(Instruction::SDiv, C1, C2);
401 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
402 return get(Instruction::FDiv, C1, C2);
404 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
405 return get(Instruction::URem, C1, C2);
407 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
408 return get(Instruction::SRem, C1, C2);
410 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
411 return get(Instruction::FRem, C1, C2);
413 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
414 return get(Instruction::And, C1, C2);
416 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
417 return get(Instruction::Or, C1, C2);
419 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
420 return get(Instruction::Xor, C1, C2);
422 unsigned ConstantExpr::getPredicate() const {
423 assert(getOpcode() == Instruction::FCmp || getOpcode() == Instruction::ICmp);
424 return dynamic_cast<const CompareConstantExpr*>(this)->predicate;
426 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2) {
427 return get(Instruction::Shl, C1, C2);
429 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2) {
430 return get(Instruction::LShr, C1, C2);
432 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2) {
433 return get(Instruction::AShr, C1, C2);
436 /// getWithOperandReplaced - Return a constant expression identical to this
437 /// one, but with the specified operand set to the specified value.
439 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
440 assert(OpNo < getNumOperands() && "Operand num is out of range!");
441 assert(Op->getType() == getOperand(OpNo)->getType() &&
442 "Replacing operand with value of different type!");
443 if (getOperand(OpNo) == Op)
444 return const_cast<ConstantExpr*>(this);
446 Constant *Op0, *Op1, *Op2;
447 switch (getOpcode()) {
448 case Instruction::Trunc:
449 case Instruction::ZExt:
450 case Instruction::SExt:
451 case Instruction::FPTrunc:
452 case Instruction::FPExt:
453 case Instruction::UIToFP:
454 case Instruction::SIToFP:
455 case Instruction::FPToUI:
456 case Instruction::FPToSI:
457 case Instruction::PtrToInt:
458 case Instruction::IntToPtr:
459 case Instruction::BitCast:
460 return ConstantExpr::getCast(getOpcode(), Op, getType());
461 case Instruction::Select:
462 Op0 = (OpNo == 0) ? Op : getOperand(0);
463 Op1 = (OpNo == 1) ? Op : getOperand(1);
464 Op2 = (OpNo == 2) ? Op : getOperand(2);
465 return ConstantExpr::getSelect(Op0, Op1, Op2);
466 case Instruction::InsertElement:
467 Op0 = (OpNo == 0) ? Op : getOperand(0);
468 Op1 = (OpNo == 1) ? Op : getOperand(1);
469 Op2 = (OpNo == 2) ? Op : getOperand(2);
470 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
471 case Instruction::ExtractElement:
472 Op0 = (OpNo == 0) ? Op : getOperand(0);
473 Op1 = (OpNo == 1) ? Op : getOperand(1);
474 return ConstantExpr::getExtractElement(Op0, Op1);
475 case Instruction::ShuffleVector:
476 Op0 = (OpNo == 0) ? Op : getOperand(0);
477 Op1 = (OpNo == 1) ? Op : getOperand(1);
478 Op2 = (OpNo == 2) ? Op : getOperand(2);
479 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
480 case Instruction::GetElementPtr: {
481 std::vector<Constant*> Ops;
482 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
483 Ops.push_back(getOperand(i));
485 return ConstantExpr::getGetElementPtr(Op, Ops);
487 return ConstantExpr::getGetElementPtr(getOperand(0), Ops);
490 assert(getNumOperands() == 2 && "Must be binary operator?");
491 Op0 = (OpNo == 0) ? Op : getOperand(0);
492 Op1 = (OpNo == 1) ? Op : getOperand(1);
493 return ConstantExpr::get(getOpcode(), Op0, Op1);
497 /// getWithOperands - This returns the current constant expression with the
498 /// operands replaced with the specified values. The specified operands must
499 /// match count and type with the existing ones.
500 Constant *ConstantExpr::
501 getWithOperands(const std::vector<Constant*> &Ops) const {
502 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
503 bool AnyChange = false;
504 for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
505 assert(Ops[i]->getType() == getOperand(i)->getType() &&
506 "Operand type mismatch!");
507 AnyChange |= Ops[i] != getOperand(i);
509 if (!AnyChange) // No operands changed, return self.
510 return const_cast<ConstantExpr*>(this);
512 switch (getOpcode()) {
513 case Instruction::Trunc:
514 case Instruction::ZExt:
515 case Instruction::SExt:
516 case Instruction::FPTrunc:
517 case Instruction::FPExt:
518 case Instruction::UIToFP:
519 case Instruction::SIToFP:
520 case Instruction::FPToUI:
521 case Instruction::FPToSI:
522 case Instruction::PtrToInt:
523 case Instruction::IntToPtr:
524 case Instruction::BitCast:
525 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
526 case Instruction::Select:
527 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
528 case Instruction::InsertElement:
529 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
530 case Instruction::ExtractElement:
531 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
532 case Instruction::ShuffleVector:
533 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
534 case Instruction::GetElementPtr: {
535 std::vector<Constant*> ActualOps(Ops.begin()+1, Ops.end());
536 return ConstantExpr::getGetElementPtr(Ops[0], ActualOps);
538 case Instruction::ICmp:
539 case Instruction::FCmp:
540 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
542 assert(getNumOperands() == 2 && "Must be binary operator?");
543 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1]);
548 //===----------------------------------------------------------------------===//
549 // isValueValidForType implementations
551 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
552 switch (Ty->getTypeID()) {
553 default: return false; // These can't be represented as integers!
554 case Type::BoolTyID: return Val == 0 || Val == 1;
555 case Type::Int8TyID: return Val <= UINT8_MAX;
556 case Type::Int16TyID: return Val <= UINT16_MAX;
557 case Type::Int32TyID: return Val <= UINT32_MAX;
558 case Type::Int64TyID: return true; // always true, has to fit in largest type
562 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
563 switch (Ty->getTypeID()) {
564 default: return false; // These can't be represented as integers!
565 case Type::BoolTyID: return (Val == 0 || Val == 1);
566 case Type::Int8TyID: return (Val >= INT8_MIN && Val <= INT8_MAX);
567 case Type::Int16TyID: return (Val >= INT16_MIN && Val <= UINT16_MAX);
568 case Type::Int32TyID: return (Val >= INT32_MIN && Val <= UINT32_MAX);
569 case Type::Int64TyID: return true; // always true, has to fit in largest type
573 bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
574 switch (Ty->getTypeID()) {
576 return false; // These can't be represented as floating point!
578 // TODO: Figure out how to test if a double can be cast to a float!
579 case Type::FloatTyID:
580 case Type::DoubleTyID:
581 return true; // This is the largest type...
585 //===----------------------------------------------------------------------===//
586 // Factory Function Implementation
588 // ConstantCreator - A class that is used to create constants by
589 // ValueMap*. This class should be partially specialized if there is
590 // something strange that needs to be done to interface to the ctor for the
594 template<class ConstantClass, class TypeClass, class ValType>
595 struct VISIBILITY_HIDDEN ConstantCreator {
596 static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
597 return new ConstantClass(Ty, V);
601 template<class ConstantClass, class TypeClass>
602 struct VISIBILITY_HIDDEN ConvertConstantType {
603 static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
604 assert(0 && "This type cannot be converted!\n");
609 template<class ValType, class TypeClass, class ConstantClass,
610 bool HasLargeKey = false /*true for arrays and structs*/ >
611 class VISIBILITY_HIDDEN ValueMap : public AbstractTypeUser {
613 typedef std::pair<const Type*, ValType> MapKey;
614 typedef std::map<MapKey, Constant *> MapTy;
615 typedef std::map<Constant*, typename MapTy::iterator> InverseMapTy;
616 typedef std::map<const Type*, typename MapTy::iterator> AbstractTypeMapTy;
618 /// Map - This is the main map from the element descriptor to the Constants.
619 /// This is the primary way we avoid creating two of the same shape
623 /// InverseMap - If "HasLargeKey" is true, this contains an inverse mapping
624 /// from the constants to their element in Map. This is important for
625 /// removal of constants from the array, which would otherwise have to scan
626 /// through the map with very large keys.
627 InverseMapTy InverseMap;
629 /// AbstractTypeMap - Map for abstract type constants.
631 AbstractTypeMapTy AbstractTypeMap;
634 void clear(std::vector<Constant *> &Constants) {
635 for(typename MapTy::iterator I = Map.begin(); I != Map.end(); ++I)
636 Constants.push_back(I->second);
638 AbstractTypeMap.clear();
643 typename MapTy::iterator map_end() { return Map.end(); }
645 /// InsertOrGetItem - Return an iterator for the specified element.
646 /// If the element exists in the map, the returned iterator points to the
647 /// entry and Exists=true. If not, the iterator points to the newly
648 /// inserted entry and returns Exists=false. Newly inserted entries have
649 /// I->second == 0, and should be filled in.
650 typename MapTy::iterator InsertOrGetItem(std::pair<MapKey, Constant *>
653 std::pair<typename MapTy::iterator, bool> IP = Map.insert(InsertVal);
659 typename MapTy::iterator FindExistingElement(ConstantClass *CP) {
661 typename InverseMapTy::iterator IMI = InverseMap.find(CP);
662 assert(IMI != InverseMap.end() && IMI->second != Map.end() &&
663 IMI->second->second == CP &&
664 "InverseMap corrupt!");
668 typename MapTy::iterator I =
669 Map.find(MapKey((TypeClass*)CP->getRawType(), getValType(CP)));
670 if (I == Map.end() || I->second != CP) {
671 // FIXME: This should not use a linear scan. If this gets to be a
672 // performance problem, someone should look at this.
673 for (I = Map.begin(); I != Map.end() && I->second != CP; ++I)
680 /// getOrCreate - Return the specified constant from the map, creating it if
682 ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
683 MapKey Lookup(Ty, V);
684 typename MapTy::iterator I = Map.lower_bound(Lookup);
686 if (I != Map.end() && I->first == Lookup)
687 return static_cast<ConstantClass *>(I->second);
689 // If no preexisting value, create one now...
690 ConstantClass *Result =
691 ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V);
693 /// FIXME: why does this assert fail when loading 176.gcc?
694 //assert(Result->getType() == Ty && "Type specified is not correct!");
695 I = Map.insert(I, std::make_pair(MapKey(Ty, V), Result));
697 if (HasLargeKey) // Remember the reverse mapping if needed.
698 InverseMap.insert(std::make_pair(Result, I));
700 // If the type of the constant is abstract, make sure that an entry exists
701 // for it in the AbstractTypeMap.
702 if (Ty->isAbstract()) {
703 typename AbstractTypeMapTy::iterator TI =
704 AbstractTypeMap.lower_bound(Ty);
706 if (TI == AbstractTypeMap.end() || TI->first != Ty) {
707 // Add ourselves to the ATU list of the type.
708 cast<DerivedType>(Ty)->addAbstractTypeUser(this);
710 AbstractTypeMap.insert(TI, std::make_pair(Ty, I));
716 void remove(ConstantClass *CP) {
717 typename MapTy::iterator I = FindExistingElement(CP);
718 assert(I != Map.end() && "Constant not found in constant table!");
719 assert(I->second == CP && "Didn't find correct element?");
721 if (HasLargeKey) // Remember the reverse mapping if needed.
722 InverseMap.erase(CP);
724 // Now that we found the entry, make sure this isn't the entry that
725 // the AbstractTypeMap points to.
726 const TypeClass *Ty = static_cast<const TypeClass *>(I->first.first);
727 if (Ty->isAbstract()) {
728 assert(AbstractTypeMap.count(Ty) &&
729 "Abstract type not in AbstractTypeMap?");
730 typename MapTy::iterator &ATMEntryIt = AbstractTypeMap[Ty];
731 if (ATMEntryIt == I) {
732 // Yes, we are removing the representative entry for this type.
733 // See if there are any other entries of the same type.
734 typename MapTy::iterator TmpIt = ATMEntryIt;
736 // First check the entry before this one...
737 if (TmpIt != Map.begin()) {
739 if (TmpIt->first.first != Ty) // Not the same type, move back...
743 // If we didn't find the same type, try to move forward...
744 if (TmpIt == ATMEntryIt) {
746 if (TmpIt == Map.end() || TmpIt->first.first != Ty)
747 --TmpIt; // No entry afterwards with the same type
750 // If there is another entry in the map of the same abstract type,
751 // update the AbstractTypeMap entry now.
752 if (TmpIt != ATMEntryIt) {
755 // Otherwise, we are removing the last instance of this type
756 // from the table. Remove from the ATM, and from user list.
757 cast<DerivedType>(Ty)->removeAbstractTypeUser(this);
758 AbstractTypeMap.erase(Ty);
767 /// MoveConstantToNewSlot - If we are about to change C to be the element
768 /// specified by I, update our internal data structures to reflect this
770 void MoveConstantToNewSlot(ConstantClass *C, typename MapTy::iterator I) {
771 // First, remove the old location of the specified constant in the map.
772 typename MapTy::iterator OldI = FindExistingElement(C);
773 assert(OldI != Map.end() && "Constant not found in constant table!");
774 assert(OldI->second == C && "Didn't find correct element?");
776 // If this constant is the representative element for its abstract type,
777 // update the AbstractTypeMap so that the representative element is I.
778 if (C->getType()->isAbstract()) {
779 typename AbstractTypeMapTy::iterator ATI =
780 AbstractTypeMap.find(C->getType());
781 assert(ATI != AbstractTypeMap.end() &&
782 "Abstract type not in AbstractTypeMap?");
783 if (ATI->second == OldI)
787 // Remove the old entry from the map.
790 // Update the inverse map so that we know that this constant is now
791 // located at descriptor I.
793 assert(I->second == C && "Bad inversemap entry!");
798 void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
799 typename AbstractTypeMapTy::iterator I =
800 AbstractTypeMap.find(cast<Type>(OldTy));
802 assert(I != AbstractTypeMap.end() &&
803 "Abstract type not in AbstractTypeMap?");
805 // Convert a constant at a time until the last one is gone. The last one
806 // leaving will remove() itself, causing the AbstractTypeMapEntry to be
807 // eliminated eventually.
809 ConvertConstantType<ConstantClass,
811 static_cast<ConstantClass *>(I->second->second),
812 cast<TypeClass>(NewTy));
814 I = AbstractTypeMap.find(cast<Type>(OldTy));
815 } while (I != AbstractTypeMap.end());
818 // If the type became concrete without being refined to any other existing
819 // type, we just remove ourselves from the ATU list.
820 void typeBecameConcrete(const DerivedType *AbsTy) {
821 AbsTy->removeAbstractTypeUser(this);
825 DOUT << "Constant.cpp: ValueMap\n";
831 //---- ConstantInt::get() implementations...
833 static ManagedStatic<ValueMap<uint64_t, Type, ConstantInt> > IntConstants;
835 // Get a ConstantInt from an int64_t. Note here that we canoncialize the value
836 // to a uint64_t value that has been zero extended down to the size of the
837 // integer type of the ConstantInt. This allows the getZExtValue method to
838 // just return the stored value while getSExtValue has to convert back to sign
839 // extended. getZExtValue is more common in LLVM than getSExtValue().
840 ConstantInt *ConstantInt::get(const Type *Ty, int64_t V) {
841 if (Ty == Type::BoolTy) return ConstantInt::get(V&1);
842 return IntConstants->getOrCreate(Ty, V & Ty->getIntegralTypeMask());
845 //---- ConstantFP::get() implementation...
849 struct ConstantCreator<ConstantFP, Type, uint64_t> {
850 static ConstantFP *create(const Type *Ty, uint64_t V) {
851 assert(Ty == Type::DoubleTy);
852 return new ConstantFP(Ty, BitsToDouble(V));
856 struct ConstantCreator<ConstantFP, Type, uint32_t> {
857 static ConstantFP *create(const Type *Ty, uint32_t V) {
858 assert(Ty == Type::FloatTy);
859 return new ConstantFP(Ty, BitsToFloat(V));
864 static ManagedStatic<ValueMap<uint64_t, Type, ConstantFP> > DoubleConstants;
865 static ManagedStatic<ValueMap<uint32_t, Type, ConstantFP> > FloatConstants;
867 bool ConstantFP::isNullValue() const {
868 return DoubleToBits(Val) == 0;
871 bool ConstantFP::isExactlyValue(double V) const {
872 return DoubleToBits(V) == DoubleToBits(Val);
876 ConstantFP *ConstantFP::get(const Type *Ty, double V) {
877 if (Ty == Type::FloatTy) {
878 // Force the value through memory to normalize it.
879 return FloatConstants->getOrCreate(Ty, FloatToBits(V));
881 assert(Ty == Type::DoubleTy);
882 return DoubleConstants->getOrCreate(Ty, DoubleToBits(V));
886 //---- ConstantAggregateZero::get() implementation...
889 // ConstantAggregateZero does not take extra "value" argument...
890 template<class ValType>
891 struct ConstantCreator<ConstantAggregateZero, Type, ValType> {
892 static ConstantAggregateZero *create(const Type *Ty, const ValType &V){
893 return new ConstantAggregateZero(Ty);
898 struct ConvertConstantType<ConstantAggregateZero, Type> {
899 static void convert(ConstantAggregateZero *OldC, const Type *NewTy) {
900 // Make everyone now use a constant of the new type...
901 Constant *New = ConstantAggregateZero::get(NewTy);
902 assert(New != OldC && "Didn't replace constant??");
903 OldC->uncheckedReplaceAllUsesWith(New);
904 OldC->destroyConstant(); // This constant is now dead, destroy it.
909 static ManagedStatic<ValueMap<char, Type,
910 ConstantAggregateZero> > AggZeroConstants;
912 static char getValType(ConstantAggregateZero *CPZ) { return 0; }
914 Constant *ConstantAggregateZero::get(const Type *Ty) {
915 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<PackedType>(Ty)) &&
916 "Cannot create an aggregate zero of non-aggregate type!");
917 return AggZeroConstants->getOrCreate(Ty, 0);
920 // destroyConstant - Remove the constant from the constant table...
922 void ConstantAggregateZero::destroyConstant() {
923 AggZeroConstants->remove(this);
924 destroyConstantImpl();
927 //---- ConstantArray::get() implementation...
931 struct ConvertConstantType<ConstantArray, ArrayType> {
932 static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
933 // Make everyone now use a constant of the new type...
934 std::vector<Constant*> C;
935 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
936 C.push_back(cast<Constant>(OldC->getOperand(i)));
937 Constant *New = ConstantArray::get(NewTy, C);
938 assert(New != OldC && "Didn't replace constant??");
939 OldC->uncheckedReplaceAllUsesWith(New);
940 OldC->destroyConstant(); // This constant is now dead, destroy it.
945 static std::vector<Constant*> getValType(ConstantArray *CA) {
946 std::vector<Constant*> Elements;
947 Elements.reserve(CA->getNumOperands());
948 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
949 Elements.push_back(cast<Constant>(CA->getOperand(i)));
953 typedef ValueMap<std::vector<Constant*>, ArrayType,
954 ConstantArray, true /*largekey*/> ArrayConstantsTy;
955 static ManagedStatic<ArrayConstantsTy> ArrayConstants;
957 Constant *ConstantArray::get(const ArrayType *Ty,
958 const std::vector<Constant*> &V) {
959 // If this is an all-zero array, return a ConstantAggregateZero object
962 if (!C->isNullValue())
963 return ArrayConstants->getOrCreate(Ty, V);
964 for (unsigned i = 1, e = V.size(); i != e; ++i)
966 return ArrayConstants->getOrCreate(Ty, V);
968 return ConstantAggregateZero::get(Ty);
971 // destroyConstant - Remove the constant from the constant table...
973 void ConstantArray::destroyConstant() {
974 ArrayConstants->remove(this);
975 destroyConstantImpl();
978 /// ConstantArray::get(const string&) - Return an array that is initialized to
979 /// contain the specified string. If length is zero then a null terminator is
980 /// added to the specified string so that it may be used in a natural way.
981 /// Otherwise, the length parameter specifies how much of the string to use
982 /// and it won't be null terminated.
984 Constant *ConstantArray::get(const std::string &Str, bool AddNull) {
985 std::vector<Constant*> ElementVals;
986 for (unsigned i = 0; i < Str.length(); ++i)
987 ElementVals.push_back(ConstantInt::get(Type::Int8Ty, Str[i]));
989 // Add a null terminator to the string...
991 ElementVals.push_back(ConstantInt::get(Type::Int8Ty, 0));
994 ArrayType *ATy = ArrayType::get(Type::Int8Ty, ElementVals.size());
995 return ConstantArray::get(ATy, ElementVals);
998 /// isString - This method returns true if the array is an array of sbyte or
999 /// ubyte, and if the elements of the array are all ConstantInt's.
1000 bool ConstantArray::isString() const {
1001 // Check the element type for sbyte or ubyte...
1002 if (getType()->getElementType() != Type::Int8Ty)
1004 // Check the elements to make sure they are all integers, not constant
1006 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1007 if (!isa<ConstantInt>(getOperand(i)))
1012 /// isCString - This method returns true if the array is a string (see
1013 /// isString) and it ends in a null byte \0 and does not contains any other
1014 /// null bytes except its terminator.
1015 bool ConstantArray::isCString() const {
1016 // Check the element type for sbyte or ubyte...
1017 if (getType()->getElementType() != Type::Int8Ty)
1019 Constant *Zero = Constant::getNullValue(getOperand(0)->getType());
1020 // Last element must be a null.
1021 if (getOperand(getNumOperands()-1) != Zero)
1023 // Other elements must be non-null integers.
1024 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1025 if (!isa<ConstantInt>(getOperand(i)))
1027 if (getOperand(i) == Zero)
1034 // getAsString - If the sub-element type of this array is either sbyte or ubyte,
1035 // then this method converts the array to an std::string and returns it.
1036 // Otherwise, it asserts out.
1038 std::string ConstantArray::getAsString() const {
1039 assert(isString() && "Not a string!");
1041 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1042 Result += (char)cast<ConstantInt>(getOperand(i))->getZExtValue();
1047 //---- ConstantStruct::get() implementation...
1052 struct ConvertConstantType<ConstantStruct, StructType> {
1053 static void convert(ConstantStruct *OldC, const StructType *NewTy) {
1054 // Make everyone now use a constant of the new type...
1055 std::vector<Constant*> C;
1056 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
1057 C.push_back(cast<Constant>(OldC->getOperand(i)));
1058 Constant *New = ConstantStruct::get(NewTy, C);
1059 assert(New != OldC && "Didn't replace constant??");
1061 OldC->uncheckedReplaceAllUsesWith(New);
1062 OldC->destroyConstant(); // This constant is now dead, destroy it.
1067 typedef ValueMap<std::vector<Constant*>, StructType,
1068 ConstantStruct, true /*largekey*/> StructConstantsTy;
1069 static ManagedStatic<StructConstantsTy> StructConstants;
1071 static std::vector<Constant*> getValType(ConstantStruct *CS) {
1072 std::vector<Constant*> Elements;
1073 Elements.reserve(CS->getNumOperands());
1074 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i)
1075 Elements.push_back(cast<Constant>(CS->getOperand(i)));
1079 Constant *ConstantStruct::get(const StructType *Ty,
1080 const std::vector<Constant*> &V) {
1081 // Create a ConstantAggregateZero value if all elements are zeros...
1082 for (unsigned i = 0, e = V.size(); i != e; ++i)
1083 if (!V[i]->isNullValue())
1084 return StructConstants->getOrCreate(Ty, V);
1086 return ConstantAggregateZero::get(Ty);
1089 Constant *ConstantStruct::get(const std::vector<Constant*> &V, bool packed) {
1090 std::vector<const Type*> StructEls;
1091 StructEls.reserve(V.size());
1092 for (unsigned i = 0, e = V.size(); i != e; ++i)
1093 StructEls.push_back(V[i]->getType());
1094 return get(StructType::get(StructEls, packed), V);
1097 // destroyConstant - Remove the constant from the constant table...
1099 void ConstantStruct::destroyConstant() {
1100 StructConstants->remove(this);
1101 destroyConstantImpl();
1104 //---- ConstantPacked::get() implementation...
1108 struct ConvertConstantType<ConstantPacked, PackedType> {
1109 static void convert(ConstantPacked *OldC, const PackedType *NewTy) {
1110 // Make everyone now use a constant of the new type...
1111 std::vector<Constant*> C;
1112 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
1113 C.push_back(cast<Constant>(OldC->getOperand(i)));
1114 Constant *New = ConstantPacked::get(NewTy, C);
1115 assert(New != OldC && "Didn't replace constant??");
1116 OldC->uncheckedReplaceAllUsesWith(New);
1117 OldC->destroyConstant(); // This constant is now dead, destroy it.
1122 static std::vector<Constant*> getValType(ConstantPacked *CP) {
1123 std::vector<Constant*> Elements;
1124 Elements.reserve(CP->getNumOperands());
1125 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1126 Elements.push_back(CP->getOperand(i));
1130 static ManagedStatic<ValueMap<std::vector<Constant*>, PackedType,
1131 ConstantPacked> > PackedConstants;
1133 Constant *ConstantPacked::get(const PackedType *Ty,
1134 const std::vector<Constant*> &V) {
1135 // If this is an all-zero packed, return a ConstantAggregateZero object
1138 if (!C->isNullValue())
1139 return PackedConstants->getOrCreate(Ty, V);
1140 for (unsigned i = 1, e = V.size(); i != e; ++i)
1142 return PackedConstants->getOrCreate(Ty, V);
1144 return ConstantAggregateZero::get(Ty);
1147 Constant *ConstantPacked::get(const std::vector<Constant*> &V) {
1148 assert(!V.empty() && "Cannot infer type if V is empty");
1149 return get(PackedType::get(V.front()->getType(),V.size()), V);
1152 // destroyConstant - Remove the constant from the constant table...
1154 void ConstantPacked::destroyConstant() {
1155 PackedConstants->remove(this);
1156 destroyConstantImpl();
1159 //---- ConstantPointerNull::get() implementation...
1163 // ConstantPointerNull does not take extra "value" argument...
1164 template<class ValType>
1165 struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
1166 static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
1167 return new ConstantPointerNull(Ty);
1172 struct ConvertConstantType<ConstantPointerNull, PointerType> {
1173 static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
1174 // Make everyone now use a constant of the new type...
1175 Constant *New = ConstantPointerNull::get(NewTy);
1176 assert(New != OldC && "Didn't replace constant??");
1177 OldC->uncheckedReplaceAllUsesWith(New);
1178 OldC->destroyConstant(); // This constant is now dead, destroy it.
1183 static ManagedStatic<ValueMap<char, PointerType,
1184 ConstantPointerNull> > NullPtrConstants;
1186 static char getValType(ConstantPointerNull *) {
1191 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1192 return NullPtrConstants->getOrCreate(Ty, 0);
1195 // destroyConstant - Remove the constant from the constant table...
1197 void ConstantPointerNull::destroyConstant() {
1198 NullPtrConstants->remove(this);
1199 destroyConstantImpl();
1203 //---- UndefValue::get() implementation...
1207 // UndefValue does not take extra "value" argument...
1208 template<class ValType>
1209 struct ConstantCreator<UndefValue, Type, ValType> {
1210 static UndefValue *create(const Type *Ty, const ValType &V) {
1211 return new UndefValue(Ty);
1216 struct ConvertConstantType<UndefValue, Type> {
1217 static void convert(UndefValue *OldC, const Type *NewTy) {
1218 // Make everyone now use a constant of the new type.
1219 Constant *New = UndefValue::get(NewTy);
1220 assert(New != OldC && "Didn't replace constant??");
1221 OldC->uncheckedReplaceAllUsesWith(New);
1222 OldC->destroyConstant(); // This constant is now dead, destroy it.
1227 static ManagedStatic<ValueMap<char, Type, UndefValue> > UndefValueConstants;
1229 static char getValType(UndefValue *) {
1234 UndefValue *UndefValue::get(const Type *Ty) {
1235 return UndefValueConstants->getOrCreate(Ty, 0);
1238 // destroyConstant - Remove the constant from the constant table.
1240 void UndefValue::destroyConstant() {
1241 UndefValueConstants->remove(this);
1242 destroyConstantImpl();
1246 //---- ConstantExpr::get() implementations...
1249 struct ExprMapKeyType {
1250 explicit ExprMapKeyType(unsigned opc, std::vector<Constant*> ops,
1251 unsigned short pred = 0) : opcode(opc), predicate(pred), operands(ops) { }
1254 std::vector<Constant*> operands;
1255 bool operator==(const ExprMapKeyType& that) const {
1256 return this->opcode == that.opcode &&
1257 this->predicate == that.predicate &&
1258 this->operands == that.operands;
1260 bool operator<(const ExprMapKeyType & that) const {
1261 return this->opcode < that.opcode ||
1262 (this->opcode == that.opcode && this->predicate < that.predicate) ||
1263 (this->opcode == that.opcode && this->predicate == that.predicate &&
1264 this->operands < that.operands);
1267 bool operator!=(const ExprMapKeyType& that) const {
1268 return !(*this == that);
1274 struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
1275 static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V,
1276 unsigned short pred = 0) {
1277 if (Instruction::isCast(V.opcode))
1278 return new UnaryConstantExpr(V.opcode, V.operands[0], Ty);
1279 if ((V.opcode >= Instruction::BinaryOpsBegin &&
1280 V.opcode < Instruction::BinaryOpsEnd) ||
1281 V.opcode == Instruction::Shl ||
1282 V.opcode == Instruction::LShr ||
1283 V.opcode == Instruction::AShr)
1284 return new BinaryConstantExpr(V.opcode, V.operands[0], V.operands[1]);
1285 if (V.opcode == Instruction::Select)
1286 return new SelectConstantExpr(V.operands[0], V.operands[1],
1288 if (V.opcode == Instruction::ExtractElement)
1289 return new ExtractElementConstantExpr(V.operands[0], V.operands[1]);
1290 if (V.opcode == Instruction::InsertElement)
1291 return new InsertElementConstantExpr(V.operands[0], V.operands[1],
1293 if (V.opcode == Instruction::ShuffleVector)
1294 return new ShuffleVectorConstantExpr(V.operands[0], V.operands[1],
1296 if (V.opcode == Instruction::GetElementPtr) {
1297 std::vector<Constant*> IdxList(V.operands.begin()+1, V.operands.end());
1298 return new GetElementPtrConstantExpr(V.operands[0], IdxList, Ty);
1301 // The compare instructions are weird. We have to encode the predicate
1302 // value and it is combined with the instruction opcode by multiplying
1303 // the opcode by one hundred. We must decode this to get the predicate.
1304 if (V.opcode == Instruction::ICmp)
1305 return new CompareConstantExpr(Instruction::ICmp, V.predicate,
1306 V.operands[0], V.operands[1]);
1307 if (V.opcode == Instruction::FCmp)
1308 return new CompareConstantExpr(Instruction::FCmp, V.predicate,
1309 V.operands[0], V.operands[1]);
1310 assert(0 && "Invalid ConstantExpr!");
1316 struct ConvertConstantType<ConstantExpr, Type> {
1317 static void convert(ConstantExpr *OldC, const Type *NewTy) {
1319 switch (OldC->getOpcode()) {
1320 case Instruction::Trunc:
1321 case Instruction::ZExt:
1322 case Instruction::SExt:
1323 case Instruction::FPTrunc:
1324 case Instruction::FPExt:
1325 case Instruction::UIToFP:
1326 case Instruction::SIToFP:
1327 case Instruction::FPToUI:
1328 case Instruction::FPToSI:
1329 case Instruction::PtrToInt:
1330 case Instruction::IntToPtr:
1331 case Instruction::BitCast:
1332 New = ConstantExpr::getCast(OldC->getOpcode(), OldC->getOperand(0),
1335 case Instruction::Select:
1336 New = ConstantExpr::getSelectTy(NewTy, OldC->getOperand(0),
1337 OldC->getOperand(1),
1338 OldC->getOperand(2));
1340 case Instruction::Shl:
1341 case Instruction::LShr:
1342 case Instruction::AShr:
1343 New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
1344 OldC->getOperand(0), OldC->getOperand(1));
1347 assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
1348 OldC->getOpcode() < Instruction::BinaryOpsEnd);
1349 New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
1350 OldC->getOperand(1));
1352 case Instruction::GetElementPtr:
1353 // Make everyone now use a constant of the new type...
1354 std::vector<Value*> Idx(OldC->op_begin()+1, OldC->op_end());
1355 New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), Idx);
1359 assert(New != OldC && "Didn't replace constant??");
1360 OldC->uncheckedReplaceAllUsesWith(New);
1361 OldC->destroyConstant(); // This constant is now dead, destroy it.
1364 } // end namespace llvm
1367 static ExprMapKeyType getValType(ConstantExpr *CE) {
1368 std::vector<Constant*> Operands;
1369 Operands.reserve(CE->getNumOperands());
1370 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1371 Operands.push_back(cast<Constant>(CE->getOperand(i)));
1372 return ExprMapKeyType(CE->getOpcode(), Operands,
1373 CE->isCompare() ? CE->getPredicate() : 0);
1376 static ManagedStatic<ValueMap<ExprMapKeyType, Type,
1377 ConstantExpr> > ExprConstants;
1379 /// This is a utility function to handle folding of casts and lookup of the
1380 /// cast in the ExprConstants map. It is usedby the various get* methods below.
1381 static inline Constant *getFoldedCast(
1382 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1383 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1384 // Fold a few common cases
1385 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1388 // Look up the constant in the table first to ensure uniqueness
1389 std::vector<Constant*> argVec(1, C);
1390 ExprMapKeyType Key(opc, argVec);
1391 return ExprConstants->getOrCreate(Ty, Key);
1394 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1395 Instruction::CastOps opc = Instruction::CastOps(oc);
1396 assert(Instruction::isCast(opc) && "opcode out of range");
1397 assert(C && Ty && "Null arguments to getCast");
1398 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1402 assert(0 && "Invalid cast opcode");
1404 case Instruction::Trunc: return getTrunc(C, Ty);
1405 case Instruction::ZExt: return getZExt(C, Ty);
1406 case Instruction::SExt: return getSExt(C, Ty);
1407 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1408 case Instruction::FPExt: return getFPExtend(C, Ty);
1409 case Instruction::UIToFP: return getUIToFP(C, Ty);
1410 case Instruction::SIToFP: return getSIToFP(C, Ty);
1411 case Instruction::FPToUI: return getFPToUI(C, Ty);
1412 case Instruction::FPToSI: return getFPToSI(C, Ty);
1413 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1414 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1415 case Instruction::BitCast: return getBitCast(C, Ty);
1420 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1421 if (C->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
1422 return getCast(Instruction::BitCast, C, Ty);
1423 return getCast(Instruction::ZExt, C, Ty);
1426 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1427 if (C->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
1428 return getCast(Instruction::BitCast, C, Ty);
1429 return getCast(Instruction::SExt, C, Ty);
1432 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1433 if (C->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
1434 return getCast(Instruction::BitCast, C, Ty);
1435 return getCast(Instruction::Trunc, C, Ty);
1438 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1439 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1440 assert((Ty->isIntegral() || Ty->getTypeID() == Type::PointerTyID) &&
1443 if (Ty->isIntegral())
1444 return getCast(Instruction::PtrToInt, S, Ty);
1445 return getCast(Instruction::BitCast, S, Ty);
1448 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1450 assert(C->getType()->isIntegral() && Ty->isIntegral() && "Invalid cast");
1451 unsigned SrcBits = C->getType()->getPrimitiveSizeInBits();
1452 unsigned DstBits = Ty->getPrimitiveSizeInBits();
1453 Instruction::CastOps opcode =
1454 (SrcBits == DstBits ? Instruction::BitCast :
1455 (SrcBits > DstBits ? Instruction::Trunc :
1456 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1457 return getCast(opcode, C, Ty);
1460 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1461 assert(C->getType()->isFloatingPoint() && Ty->isFloatingPoint() &&
1463 unsigned SrcBits = C->getType()->getPrimitiveSizeInBits();
1464 unsigned DstBits = Ty->getPrimitiveSizeInBits();
1465 if (SrcBits == DstBits)
1466 return C; // Avoid a useless cast
1467 Instruction::CastOps opcode =
1468 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1469 return getCast(opcode, C, Ty);
1472 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1473 assert(C->getType()->isInteger() && "Trunc operand must be integer");
1474 assert(Ty->isIntegral() && "Trunc produces only integral");
1475 assert(C->getType()->getPrimitiveSizeInBits() > Ty->getPrimitiveSizeInBits()&&
1476 "SrcTy must be larger than DestTy for Trunc!");
1478 return getFoldedCast(Instruction::Trunc, C, Ty);
1481 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1482 assert(C->getType()->isIntegral() && "SEXt operand must be integral");
1483 assert(Ty->isInteger() && "SExt produces only integer");
1484 assert(C->getType()->getPrimitiveSizeInBits() < Ty->getPrimitiveSizeInBits()&&
1485 "SrcTy must be smaller than DestTy for SExt!");
1487 return getFoldedCast(Instruction::SExt, C, Ty);
1490 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1491 assert(C->getType()->isIntegral() && "ZEXt operand must be integral");
1492 assert(Ty->isInteger() && "ZExt produces only integer");
1493 assert(C->getType()->getPrimitiveSizeInBits() < Ty->getPrimitiveSizeInBits()&&
1494 "SrcTy must be smaller than DestTy for ZExt!");
1496 return getFoldedCast(Instruction::ZExt, C, Ty);
1499 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1500 assert(C->getType()->isFloatingPoint() && Ty->isFloatingPoint() &&
1501 C->getType()->getPrimitiveSizeInBits() > Ty->getPrimitiveSizeInBits()&&
1502 "This is an illegal floating point truncation!");
1503 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1506 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1507 assert(C->getType()->isFloatingPoint() && Ty->isFloatingPoint() &&
1508 C->getType()->getPrimitiveSizeInBits() < Ty->getPrimitiveSizeInBits()&&
1509 "This is an illegal floating point extension!");
1510 return getFoldedCast(Instruction::FPExt, C, Ty);
1513 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1514 assert(C->getType()->isIntegral() && Ty->isFloatingPoint() &&
1515 "This is an illegal uint to floating point cast!");
1516 return getFoldedCast(Instruction::UIToFP, C, Ty);
1519 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1520 assert(C->getType()->isIntegral() && Ty->isFloatingPoint() &&
1521 "This is an illegal sint to floating point cast!");
1522 return getFoldedCast(Instruction::SIToFP, C, Ty);
1525 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1526 assert(C->getType()->isFloatingPoint() && Ty->isIntegral() &&
1527 "This is an illegal floating point to uint cast!");
1528 return getFoldedCast(Instruction::FPToUI, C, Ty);
1531 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1532 assert(C->getType()->isFloatingPoint() && Ty->isIntegral() &&
1533 "This is an illegal floating point to sint cast!");
1534 return getFoldedCast(Instruction::FPToSI, C, Ty);
1537 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1538 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1539 assert(DstTy->isIntegral() && "PtrToInt destination must be integral");
1540 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1543 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1544 assert(C->getType()->isIntegral() && "IntToPtr source must be integral");
1545 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1546 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1549 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1550 // BitCast implies a no-op cast of type only. No bits change. However, you
1551 // can't cast pointers to anything but pointers.
1552 const Type *SrcTy = C->getType();
1553 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1554 "BitCast cannot cast pointer to non-pointer and vice versa");
1556 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1557 // or nonptr->ptr). For all the other types, the cast is okay if source and
1558 // destination bit widths are identical.
1559 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1560 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1561 assert(SrcBitSize == DstBitSize && "BitCast requies types of same width");
1562 return getFoldedCast(Instruction::BitCast, C, DstTy);
1565 Constant *ConstantExpr::getSizeOf(const Type *Ty) {
1566 // sizeof is implemented as: (ulong) gep (Ty*)null, 1
1567 return getCast(Instruction::PtrToInt, getGetElementPtr(getNullValue(
1568 PointerType::get(Ty)), std::vector<Constant*>(1,
1569 ConstantInt::get(Type::Int32Ty, 1))), Type::Int64Ty);
1572 Constant *ConstantExpr::getPtrPtrFromArrayPtr(Constant *C) {
1573 // pointer from array is implemented as: getelementptr arr ptr, 0, 0
1574 static std::vector<Constant*> Indices(2, ConstantInt::get(Type::Int32Ty, 0));
1576 return ConstantExpr::getGetElementPtr(C, Indices);
1579 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1580 Constant *C1, Constant *C2) {
1581 if (Opcode == Instruction::Shl || Opcode == Instruction::LShr ||
1582 Opcode == Instruction::AShr)
1583 return getShiftTy(ReqTy, Opcode, C1, C2);
1585 // Check the operands for consistency first
1586 assert(Opcode >= Instruction::BinaryOpsBegin &&
1587 Opcode < Instruction::BinaryOpsEnd &&
1588 "Invalid opcode in binary constant expression");
1589 assert(C1->getType() == C2->getType() &&
1590 "Operand types in binary constant expression should match");
1592 if (ReqTy == C1->getType() || ReqTy == Type::BoolTy)
1593 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1594 return FC; // Fold a few common cases...
1596 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1597 ExprMapKeyType Key(Opcode, argVec);
1598 return ExprConstants->getOrCreate(ReqTy, Key);
1601 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1602 Constant *C1, Constant *C2) {
1603 switch (predicate) {
1604 default: assert(0 && "Invalid CmpInst predicate");
1605 case FCmpInst::FCMP_FALSE: case FCmpInst::FCMP_OEQ: case FCmpInst::FCMP_OGT:
1606 case FCmpInst::FCMP_OGE: case FCmpInst::FCMP_OLT: case FCmpInst::FCMP_OLE:
1607 case FCmpInst::FCMP_ONE: case FCmpInst::FCMP_ORD: case FCmpInst::FCMP_UNO:
1608 case FCmpInst::FCMP_UEQ: case FCmpInst::FCMP_UGT: case FCmpInst::FCMP_UGE:
1609 case FCmpInst::FCMP_ULT: case FCmpInst::FCMP_ULE: case FCmpInst::FCMP_UNE:
1610 case FCmpInst::FCMP_TRUE:
1611 return getFCmp(predicate, C1, C2);
1612 case ICmpInst::ICMP_EQ: case ICmpInst::ICMP_NE: case ICmpInst::ICMP_UGT:
1613 case ICmpInst::ICMP_UGE: case ICmpInst::ICMP_ULT: case ICmpInst::ICMP_ULE:
1614 case ICmpInst::ICMP_SGT: case ICmpInst::ICMP_SGE: case ICmpInst::ICMP_SLT:
1615 case ICmpInst::ICMP_SLE:
1616 return getICmp(predicate, C1, C2);
1620 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
1623 case Instruction::Add:
1624 case Instruction::Sub:
1625 case Instruction::Mul:
1626 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1627 assert((C1->getType()->isInteger() || C1->getType()->isFloatingPoint() ||
1628 isa<PackedType>(C1->getType())) &&
1629 "Tried to create an arithmetic operation on a non-arithmetic type!");
1631 case Instruction::UDiv:
1632 case Instruction::SDiv:
1633 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1634 assert((C1->getType()->isInteger() || (isa<PackedType>(C1->getType()) &&
1635 cast<PackedType>(C1->getType())->getElementType()->isInteger())) &&
1636 "Tried to create an arithmetic operation on a non-arithmetic type!");
1638 case Instruction::FDiv:
1639 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1640 assert((C1->getType()->isFloatingPoint() || (isa<PackedType>(C1->getType())
1641 && cast<PackedType>(C1->getType())->getElementType()->isFloatingPoint()))
1642 && "Tried to create an arithmetic operation on a non-arithmetic type!");
1644 case Instruction::URem:
1645 case Instruction::SRem:
1646 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1647 assert((C1->getType()->isInteger() || (isa<PackedType>(C1->getType()) &&
1648 cast<PackedType>(C1->getType())->getElementType()->isInteger())) &&
1649 "Tried to create an arithmetic operation on a non-arithmetic type!");
1651 case Instruction::FRem:
1652 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1653 assert((C1->getType()->isFloatingPoint() || (isa<PackedType>(C1->getType())
1654 && cast<PackedType>(C1->getType())->getElementType()->isFloatingPoint()))
1655 && "Tried to create an arithmetic operation on a non-arithmetic type!");
1657 case Instruction::And:
1658 case Instruction::Or:
1659 case Instruction::Xor:
1660 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1661 assert((C1->getType()->isIntegral() || isa<PackedType>(C1->getType())) &&
1662 "Tried to create a logical operation on a non-integral type!");
1664 case Instruction::Shl:
1665 case Instruction::LShr:
1666 case Instruction::AShr:
1667 assert(C2->getType() == Type::Int8Ty && "Shift should be by ubyte!");
1668 assert(C1->getType()->isInteger() &&
1669 "Tried to create a shift operation on a non-integer type!");
1676 return getTy(C1->getType(), Opcode, C1, C2);
1679 Constant *ConstantExpr::getCompare(unsigned short pred,
1680 Constant *C1, Constant *C2) {
1681 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1682 return getCompareTy(pred, C1, C2);
1685 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1686 Constant *V1, Constant *V2) {
1687 assert(C->getType() == Type::BoolTy && "Select condition must be bool!");
1688 assert(V1->getType() == V2->getType() && "Select value types must match!");
1689 assert(V1->getType()->isFirstClassType() && "Cannot select aggregate type!");
1691 if (ReqTy == V1->getType())
1692 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1693 return SC; // Fold common cases
1695 std::vector<Constant*> argVec(3, C);
1698 ExprMapKeyType Key(Instruction::Select, argVec);
1699 return ExprConstants->getOrCreate(ReqTy, Key);
1702 /// getShiftTy - Return a shift left or shift right constant expr
1703 Constant *ConstantExpr::getShiftTy(const Type *ReqTy, unsigned Opcode,
1704 Constant *C1, Constant *C2) {
1705 // Check the operands for consistency first
1706 assert((Opcode == Instruction::Shl ||
1707 Opcode == Instruction::LShr ||
1708 Opcode == Instruction::AShr) &&
1709 "Invalid opcode in binary constant expression");
1710 assert(C1->getType()->isIntegral() && C2->getType() == Type::Int8Ty &&
1711 "Invalid operand types for Shift constant expr!");
1713 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1714 return FC; // Fold a few common cases...
1716 // Look up the constant in the table first to ensure uniqueness
1717 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1718 ExprMapKeyType Key(Opcode, argVec);
1719 return ExprConstants->getOrCreate(ReqTy, Key);
1722 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1723 const std::vector<Value*> &IdxList) {
1724 assert(GetElementPtrInst::getIndexedType(C->getType(), IdxList, true) &&
1725 "GEP indices invalid!");
1727 if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
1728 return FC; // Fold a few common cases...
1730 assert(isa<PointerType>(C->getType()) &&
1731 "Non-pointer type for constant GetElementPtr expression");
1732 // Look up the constant in the table first to ensure uniqueness
1733 std::vector<Constant*> ArgVec;
1734 ArgVec.reserve(IdxList.size()+1);
1735 ArgVec.push_back(C);
1736 for (unsigned i = 0, e = IdxList.size(); i != e; ++i)
1737 ArgVec.push_back(cast<Constant>(IdxList[i]));
1738 const ExprMapKeyType Key(Instruction::GetElementPtr,ArgVec);
1739 return ExprConstants->getOrCreate(ReqTy, Key);
1742 Constant *ConstantExpr::getGetElementPtr(Constant *C,
1743 const std::vector<Constant*> &IdxList){
1744 // Get the result type of the getelementptr!
1745 std::vector<Value*> VIdxList(IdxList.begin(), IdxList.end());
1747 const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), VIdxList,
1749 assert(Ty && "GEP indices invalid!");
1750 return getGetElementPtrTy(PointerType::get(Ty), C, VIdxList);
1753 Constant *ConstantExpr::getGetElementPtr(Constant *C,
1754 const std::vector<Value*> &IdxList) {
1755 // Get the result type of the getelementptr!
1756 const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), IdxList,
1758 assert(Ty && "GEP indices invalid!");
1759 return getGetElementPtrTy(PointerType::get(Ty), C, IdxList);
1763 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1764 assert(LHS->getType() == RHS->getType());
1765 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1766 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1768 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1769 return FC; // Fold a few common cases...
1771 // Look up the constant in the table first to ensure uniqueness
1772 std::vector<Constant*> ArgVec;
1773 ArgVec.push_back(LHS);
1774 ArgVec.push_back(RHS);
1775 // Get the key type with both the opcode and predicate
1776 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1777 return ExprConstants->getOrCreate(Type::BoolTy, Key);
1781 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1782 assert(LHS->getType() == RHS->getType());
1783 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1785 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1786 return FC; // Fold a few common cases...
1788 // Look up the constant in the table first to ensure uniqueness
1789 std::vector<Constant*> ArgVec;
1790 ArgVec.push_back(LHS);
1791 ArgVec.push_back(RHS);
1792 // Get the key type with both the opcode and predicate
1793 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1794 return ExprConstants->getOrCreate(Type::BoolTy, Key);
1797 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1799 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1800 return FC; // Fold a few common cases...
1801 // Look up the constant in the table first to ensure uniqueness
1802 std::vector<Constant*> ArgVec(1, Val);
1803 ArgVec.push_back(Idx);
1804 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1805 return ExprConstants->getOrCreate(ReqTy, Key);
1808 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1809 assert(isa<PackedType>(Val->getType()) &&
1810 "Tried to create extractelement operation on non-packed type!");
1811 assert(Idx->getType() == Type::Int32Ty &&
1812 "Extractelement index must be uint type!");
1813 return getExtractElementTy(cast<PackedType>(Val->getType())->getElementType(),
1817 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1818 Constant *Elt, Constant *Idx) {
1819 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1820 return FC; // Fold a few common cases...
1821 // Look up the constant in the table first to ensure uniqueness
1822 std::vector<Constant*> ArgVec(1, Val);
1823 ArgVec.push_back(Elt);
1824 ArgVec.push_back(Idx);
1825 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1826 return ExprConstants->getOrCreate(ReqTy, Key);
1829 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1831 assert(isa<PackedType>(Val->getType()) &&
1832 "Tried to create insertelement operation on non-packed type!");
1833 assert(Elt->getType() == cast<PackedType>(Val->getType())->getElementType()
1834 && "Insertelement types must match!");
1835 assert(Idx->getType() == Type::Int32Ty &&
1836 "Insertelement index must be uint type!");
1837 return getInsertElementTy(cast<PackedType>(Val->getType())->getElementType(),
1841 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1842 Constant *V2, Constant *Mask) {
1843 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1844 return FC; // Fold a few common cases...
1845 // Look up the constant in the table first to ensure uniqueness
1846 std::vector<Constant*> ArgVec(1, V1);
1847 ArgVec.push_back(V2);
1848 ArgVec.push_back(Mask);
1849 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1850 return ExprConstants->getOrCreate(ReqTy, Key);
1853 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1855 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1856 "Invalid shuffle vector constant expr operands!");
1857 return getShuffleVectorTy(V1->getType(), V1, V2, Mask);
1860 // destroyConstant - Remove the constant from the constant table...
1862 void ConstantExpr::destroyConstant() {
1863 ExprConstants->remove(this);
1864 destroyConstantImpl();
1867 const char *ConstantExpr::getOpcodeName() const {
1868 return Instruction::getOpcodeName(getOpcode());
1871 //===----------------------------------------------------------------------===//
1872 // replaceUsesOfWithOnConstant implementations
1874 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1876 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1877 Constant *ToC = cast<Constant>(To);
1879 unsigned OperandToUpdate = U-OperandList;
1880 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
1882 std::pair<ArrayConstantsTy::MapKey, Constant*> Lookup;
1883 Lookup.first.first = getType();
1884 Lookup.second = this;
1886 std::vector<Constant*> &Values = Lookup.first.second;
1887 Values.reserve(getNumOperands()); // Build replacement array.
1889 // Fill values with the modified operands of the constant array. Also,
1890 // compute whether this turns into an all-zeros array.
1891 bool isAllZeros = false;
1892 if (!ToC->isNullValue()) {
1893 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O)
1894 Values.push_back(cast<Constant>(O->get()));
1897 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1898 Constant *Val = cast<Constant>(O->get());
1899 Values.push_back(Val);
1900 if (isAllZeros) isAllZeros = Val->isNullValue();
1903 Values[OperandToUpdate] = ToC;
1905 Constant *Replacement = 0;
1907 Replacement = ConstantAggregateZero::get(getType());
1909 // Check to see if we have this array type already.
1911 ArrayConstantsTy::MapTy::iterator I =
1912 ArrayConstants->InsertOrGetItem(Lookup, Exists);
1915 Replacement = I->second;
1917 // Okay, the new shape doesn't exist in the system yet. Instead of
1918 // creating a new constant array, inserting it, replaceallusesof'ing the
1919 // old with the new, then deleting the old... just update the current one
1921 ArrayConstants->MoveConstantToNewSlot(this, I);
1923 // Update to the new value.
1924 setOperand(OperandToUpdate, ToC);
1929 // Otherwise, I do need to replace this with an existing value.
1930 assert(Replacement != this && "I didn't contain From!");
1932 // Everyone using this now uses the replacement.
1933 uncheckedReplaceAllUsesWith(Replacement);
1935 // Delete the old constant!
1939 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
1941 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1942 Constant *ToC = cast<Constant>(To);
1944 unsigned OperandToUpdate = U-OperandList;
1945 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
1947 std::pair<StructConstantsTy::MapKey, Constant*> Lookup;
1948 Lookup.first.first = getType();
1949 Lookup.second = this;
1950 std::vector<Constant*> &Values = Lookup.first.second;
1951 Values.reserve(getNumOperands()); // Build replacement struct.
1954 // Fill values with the modified operands of the constant struct. Also,
1955 // compute whether this turns into an all-zeros struct.
1956 bool isAllZeros = false;
1957 if (!ToC->isNullValue()) {
1958 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O)
1959 Values.push_back(cast<Constant>(O->get()));
1962 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1963 Constant *Val = cast<Constant>(O->get());
1964 Values.push_back(Val);
1965 if (isAllZeros) isAllZeros = Val->isNullValue();
1968 Values[OperandToUpdate] = ToC;
1970 Constant *Replacement = 0;
1972 Replacement = ConstantAggregateZero::get(getType());
1974 // Check to see if we have this array type already.
1976 StructConstantsTy::MapTy::iterator I =
1977 StructConstants->InsertOrGetItem(Lookup, Exists);
1980 Replacement = I->second;
1982 // Okay, the new shape doesn't exist in the system yet. Instead of
1983 // creating a new constant struct, inserting it, replaceallusesof'ing the
1984 // old with the new, then deleting the old... just update the current one
1986 StructConstants->MoveConstantToNewSlot(this, I);
1988 // Update to the new value.
1989 setOperand(OperandToUpdate, ToC);
1994 assert(Replacement != this && "I didn't contain From!");
1996 // Everyone using this now uses the replacement.
1997 uncheckedReplaceAllUsesWith(Replacement);
1999 // Delete the old constant!
2003 void ConstantPacked::replaceUsesOfWithOnConstant(Value *From, Value *To,
2005 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2007 std::vector<Constant*> Values;
2008 Values.reserve(getNumOperands()); // Build replacement array...
2009 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2010 Constant *Val = getOperand(i);
2011 if (Val == From) Val = cast<Constant>(To);
2012 Values.push_back(Val);
2015 Constant *Replacement = ConstantPacked::get(getType(), Values);
2016 assert(Replacement != this && "I didn't contain From!");
2018 // Everyone using this now uses the replacement.
2019 uncheckedReplaceAllUsesWith(Replacement);
2021 // Delete the old constant!
2025 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2027 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2028 Constant *To = cast<Constant>(ToV);
2030 Constant *Replacement = 0;
2031 if (getOpcode() == Instruction::GetElementPtr) {
2032 std::vector<Constant*> Indices;
2033 Constant *Pointer = getOperand(0);
2034 Indices.reserve(getNumOperands()-1);
2035 if (Pointer == From) Pointer = To;
2037 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2038 Constant *Val = getOperand(i);
2039 if (Val == From) Val = To;
2040 Indices.push_back(Val);
2042 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices);
2043 } else if (isCast()) {
2044 assert(getOperand(0) == From && "Cast only has one use!");
2045 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2046 } else if (getOpcode() == Instruction::Select) {
2047 Constant *C1 = getOperand(0);
2048 Constant *C2 = getOperand(1);
2049 Constant *C3 = getOperand(2);
2050 if (C1 == From) C1 = To;
2051 if (C2 == From) C2 = To;
2052 if (C3 == From) C3 = To;
2053 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2054 } else if (getOpcode() == Instruction::ExtractElement) {
2055 Constant *C1 = getOperand(0);
2056 Constant *C2 = getOperand(1);
2057 if (C1 == From) C1 = To;
2058 if (C2 == From) C2 = To;
2059 Replacement = ConstantExpr::getExtractElement(C1, C2);
2060 } else if (getOpcode() == Instruction::InsertElement) {
2061 Constant *C1 = getOperand(0);
2062 Constant *C2 = getOperand(1);
2063 Constant *C3 = getOperand(1);
2064 if (C1 == From) C1 = To;
2065 if (C2 == From) C2 = To;
2066 if (C3 == From) C3 = To;
2067 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2068 } else if (getOpcode() == Instruction::ShuffleVector) {
2069 Constant *C1 = getOperand(0);
2070 Constant *C2 = getOperand(1);
2071 Constant *C3 = getOperand(2);
2072 if (C1 == From) C1 = To;
2073 if (C2 == From) C2 = To;
2074 if (C3 == From) C3 = To;
2075 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2076 } else if (isCompare()) {
2077 Constant *C1 = getOperand(0);
2078 Constant *C2 = getOperand(1);
2079 if (C1 == From) C1 = To;
2080 if (C2 == From) C2 = To;
2081 if (getOpcode() == Instruction::ICmp)
2082 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2084 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2085 } else if (getNumOperands() == 2) {
2086 Constant *C1 = getOperand(0);
2087 Constant *C2 = getOperand(1);
2088 if (C1 == From) C1 = To;
2089 if (C2 == From) C2 = To;
2090 Replacement = ConstantExpr::get(getOpcode(), C1, C2);
2092 assert(0 && "Unknown ConstantExpr type!");
2096 assert(Replacement != this && "I didn't contain From!");
2098 // Everyone using this now uses the replacement.
2099 uncheckedReplaceAllUsesWith(Replacement);
2101 // Delete the old constant!
2106 /// getStringValue - Turn an LLVM constant pointer that eventually points to a
2107 /// global into a string value. Return an empty string if we can't do it.
2108 /// Parameter Chop determines if the result is chopped at the first null
2111 std::string Constant::getStringValue(bool Chop, unsigned Offset) {
2112 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(this)) {
2113 if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) {
2114 ConstantArray *Init = cast<ConstantArray>(GV->getInitializer());
2115 if (Init->isString()) {
2116 std::string Result = Init->getAsString();
2117 if (Offset < Result.size()) {
2118 // If we are pointing INTO The string, erase the beginning...
2119 Result.erase(Result.begin(), Result.begin()+Offset);
2121 // Take off the null terminator, and any string fragments after it.
2123 std::string::size_type NullPos = Result.find_first_of((char)0);
2124 if (NullPos != std::string::npos)
2125 Result.erase(Result.begin()+NullPos, Result.end());
2131 } else if (Constant *C = dyn_cast<Constant>(this)) {
2132 if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
2133 return GV->getStringValue(Chop, Offset);
2134 else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2135 if (CE->getOpcode() == Instruction::GetElementPtr) {
2136 // Turn a gep into the specified offset.
2137 if (CE->getNumOperands() == 3 &&
2138 cast<Constant>(CE->getOperand(1))->isNullValue() &&
2139 isa<ConstantInt>(CE->getOperand(2))) {
2140 Offset += cast<ConstantInt>(CE->getOperand(2))->getZExtValue();
2141 return CE->getOperand(0)->getStringValue(Chop, Offset);