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/MathExtras.h"
27 ConstantBool *ConstantBool::True = new ConstantBool(true);
28 ConstantBool *ConstantBool::False = new ConstantBool(false);
31 //===----------------------------------------------------------------------===//
33 //===----------------------------------------------------------------------===//
35 void Constant::destroyConstantImpl() {
36 // When a Constant is destroyed, there may be lingering
37 // references to the constant by other constants in the constant pool. These
38 // constants are implicitly dependent on the module that is being deleted,
39 // but they don't know that. Because we only find out when the CPV is
40 // deleted, we must now notify all of our users (that should only be
41 // Constants) that they are, in fact, invalid now and should be deleted.
43 while (!use_empty()) {
44 Value *V = use_back();
45 #ifndef NDEBUG // Only in -g mode...
46 if (!isa<Constant>(V))
47 std::cerr << "While deleting: " << *this
48 << "\n\nUse still stuck around after Def is destroyed: "
51 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
52 Constant *CV = cast<Constant>(V);
53 CV->destroyConstant();
55 // The constant should remove itself from our use list...
56 assert((use_empty() || use_back() != V) && "Constant not removed!");
59 // Value has no outstanding references it is safe to delete it now...
63 // Static constructor to create a '0' constant of arbitrary type...
64 Constant *Constant::getNullValue(const Type *Ty) {
65 switch (Ty->getTypeID()) {
66 case Type::BoolTyID: {
67 static Constant *NullBool = ConstantBool::get(false);
70 case Type::SByteTyID: {
71 static Constant *NullSByte = ConstantSInt::get(Type::SByteTy, 0);
74 case Type::UByteTyID: {
75 static Constant *NullUByte = ConstantUInt::get(Type::UByteTy, 0);
78 case Type::ShortTyID: {
79 static Constant *NullShort = ConstantSInt::get(Type::ShortTy, 0);
82 case Type::UShortTyID: {
83 static Constant *NullUShort = ConstantUInt::get(Type::UShortTy, 0);
87 static Constant *NullInt = ConstantSInt::get(Type::IntTy, 0);
90 case Type::UIntTyID: {
91 static Constant *NullUInt = ConstantUInt::get(Type::UIntTy, 0);
94 case Type::LongTyID: {
95 static Constant *NullLong = ConstantSInt::get(Type::LongTy, 0);
98 case Type::ULongTyID: {
99 static Constant *NullULong = ConstantUInt::get(Type::ULongTy, 0);
103 case Type::FloatTyID: {
104 static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
107 case Type::DoubleTyID: {
108 static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
112 case Type::PointerTyID:
113 return ConstantPointerNull::get(cast<PointerType>(Ty));
115 case Type::StructTyID:
116 case Type::ArrayTyID:
117 case Type::PackedTyID:
118 return ConstantAggregateZero::get(Ty);
120 // Function, Label, or Opaque type?
121 assert(!"Cannot create a null constant of that type!");
126 // Static constructor to create the maximum constant of an integral type...
127 ConstantIntegral *ConstantIntegral::getMaxValue(const Type *Ty) {
128 switch (Ty->getTypeID()) {
129 case Type::BoolTyID: return ConstantBool::True;
130 case Type::SByteTyID:
131 case Type::ShortTyID:
133 case Type::LongTyID: {
134 // Calculate 011111111111111...
135 unsigned TypeBits = Ty->getPrimitiveSize()*8;
136 int64_t Val = INT64_MAX; // All ones
137 Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
138 return ConstantSInt::get(Ty, Val);
141 case Type::UByteTyID:
142 case Type::UShortTyID:
144 case Type::ULongTyID: return getAllOnesValue(Ty);
150 // Static constructor to create the minimum constant for an integral type...
151 ConstantIntegral *ConstantIntegral::getMinValue(const Type *Ty) {
152 switch (Ty->getTypeID()) {
153 case Type::BoolTyID: return ConstantBool::False;
154 case Type::SByteTyID:
155 case Type::ShortTyID:
157 case Type::LongTyID: {
158 // Calculate 1111111111000000000000
159 unsigned TypeBits = Ty->getPrimitiveSize()*8;
160 int64_t Val = -1; // All ones
161 Val <<= TypeBits-1; // Shift over to the right spot
162 return ConstantSInt::get(Ty, Val);
165 case Type::UByteTyID:
166 case Type::UShortTyID:
168 case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
174 // Static constructor to create an integral constant with all bits set
175 ConstantIntegral *ConstantIntegral::getAllOnesValue(const Type *Ty) {
176 switch (Ty->getTypeID()) {
177 case Type::BoolTyID: return ConstantBool::True;
178 case Type::SByteTyID:
179 case Type::ShortTyID:
181 case Type::LongTyID: return ConstantSInt::get(Ty, -1);
183 case Type::UByteTyID:
184 case Type::UShortTyID:
186 case Type::ULongTyID: {
187 // Calculate ~0 of the right type...
188 unsigned TypeBits = Ty->getPrimitiveSize()*8;
189 uint64_t Val = ~0ULL; // All ones
190 Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
191 return ConstantUInt::get(Ty, Val);
197 bool ConstantUInt::isAllOnesValue() const {
198 unsigned TypeBits = getType()->getPrimitiveSize()*8;
199 uint64_t Val = ~0ULL; // All ones
200 Val >>= 64-TypeBits; // Shift out inappropriate bits
201 return getValue() == Val;
205 //===----------------------------------------------------------------------===//
206 // ConstantXXX Classes
207 //===----------------------------------------------------------------------===//
209 //===----------------------------------------------------------------------===//
210 // Normal Constructors
212 ConstantIntegral::ConstantIntegral(const Type *Ty, ValueTy VT, uint64_t V)
213 : Constant(Ty, VT, 0, 0) {
217 ConstantBool::ConstantBool(bool V)
218 : ConstantIntegral(Type::BoolTy, ConstantBoolVal, V) {
221 ConstantInt::ConstantInt(const Type *Ty, ValueTy VT, uint64_t V)
222 : ConstantIntegral(Ty, VT, V) {
225 ConstantSInt::ConstantSInt(const Type *Ty, int64_t V)
226 : ConstantInt(Ty, ConstantSIntVal, V) {
227 assert(Ty->isInteger() && Ty->isSigned() &&
228 "Illegal type for signed integer constant!");
229 assert(isValueValidForType(Ty, V) && "Value too large for type!");
232 ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V)
233 : ConstantInt(Ty, ConstantUIntVal, V) {
234 assert(Ty->isInteger() && Ty->isUnsigned() &&
235 "Illegal type for unsigned integer constant!");
236 assert(isValueValidForType(Ty, V) && "Value too large for type!");
239 ConstantFP::ConstantFP(const Type *Ty, double V)
240 : Constant(Ty, ConstantFPVal, 0, 0) {
241 assert(isValueValidForType(Ty, V) && "Value too large for type!");
245 ConstantArray::ConstantArray(const ArrayType *T,
246 const std::vector<Constant*> &V)
247 : Constant(T, ConstantArrayVal, new Use[V.size()], V.size()) {
248 assert(V.size() == T->getNumElements() &&
249 "Invalid initializer vector for constant array");
250 Use *OL = OperandList;
251 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
254 assert((E->getType() == T->getElementType() ||
256 E->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
257 "Initializer for array element doesn't match array element type!");
262 ConstantArray::~ConstantArray() {
263 delete [] OperandList;
266 ConstantStruct::ConstantStruct(const StructType *T,
267 const std::vector<Constant*> &V)
268 : Constant(T, ConstantStructVal, new Use[V.size()], V.size()) {
269 assert(V.size() == T->getNumElements() &&
270 "Invalid initializer vector for constant structure");
271 Use *OL = OperandList;
272 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
275 assert((E->getType() == T->getElementType(I-V.begin()) ||
276 ((T->getElementType(I-V.begin())->isAbstract() ||
277 E->getType()->isAbstract()) &&
278 T->getElementType(I-V.begin())->getTypeID() ==
279 E->getType()->getTypeID())) &&
280 "Initializer for struct element doesn't match struct element type!");
285 ConstantStruct::~ConstantStruct() {
286 delete [] OperandList;
290 ConstantPacked::ConstantPacked(const PackedType *T,
291 const std::vector<Constant*> &V)
292 : Constant(T, ConstantPackedVal, new Use[V.size()], V.size()) {
293 Use *OL = OperandList;
294 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
297 assert((E->getType() == T->getElementType() ||
299 E->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
300 "Initializer for packed element doesn't match packed element type!");
305 ConstantPacked::~ConstantPacked() {
306 delete [] OperandList;
309 /// UnaryConstantExpr - This class is private to Constants.cpp, and is used
310 /// behind the scenes to implement unary constant exprs.
311 class UnaryConstantExpr : public ConstantExpr {
314 UnaryConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
315 : ConstantExpr(Ty, Opcode, &Op, 1), Op(C, this) {}
318 static bool isSetCC(unsigned Opcode) {
319 return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE ||
320 Opcode == Instruction::SetLT || Opcode == Instruction::SetGT ||
321 Opcode == Instruction::SetLE || Opcode == Instruction::SetGE;
324 /// BinaryConstantExpr - This class is private to Constants.cpp, and is used
325 /// behind the scenes to implement binary constant exprs.
326 class BinaryConstantExpr : public ConstantExpr {
329 BinaryConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
330 : ConstantExpr(isSetCC(Opcode) ? Type::BoolTy : C1->getType(),
332 Ops[0].init(C1, this);
333 Ops[1].init(C2, this);
337 /// SelectConstantExpr - This class is private to Constants.cpp, and is used
338 /// behind the scenes to implement select constant exprs.
339 class SelectConstantExpr : public ConstantExpr {
342 SelectConstantExpr(Constant *C1, Constant *C2, Constant *C3)
343 : ConstantExpr(C2->getType(), Instruction::Select, Ops, 3) {
344 Ops[0].init(C1, this);
345 Ops[1].init(C2, this);
346 Ops[2].init(C3, this);
350 /// GetElementPtrConstantExpr - This class is private to Constants.cpp, and is
351 /// used behind the scenes to implement getelementpr constant exprs.
352 struct GetElementPtrConstantExpr : public ConstantExpr {
353 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
355 : ConstantExpr(DestTy, Instruction::GetElementPtr,
356 new Use[IdxList.size()+1], IdxList.size()+1) {
357 OperandList[0].init(C, this);
358 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
359 OperandList[i+1].init(IdxList[i], this);
361 ~GetElementPtrConstantExpr() {
362 delete [] OperandList;
366 /// ConstantExpr::get* - Return some common constants without having to
367 /// specify the full Instruction::OPCODE identifier.
369 Constant *ConstantExpr::getNeg(Constant *C) {
370 if (!C->getType()->isFloatingPoint())
371 return get(Instruction::Sub, getNullValue(C->getType()), C);
373 return get(Instruction::Sub, ConstantFP::get(C->getType(), -0.0), C);
375 Constant *ConstantExpr::getNot(Constant *C) {
376 assert(isa<ConstantIntegral>(C) && "Cannot NOT a nonintegral type!");
377 return get(Instruction::Xor, C,
378 ConstantIntegral::getAllOnesValue(C->getType()));
380 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2) {
381 return get(Instruction::Add, C1, C2);
383 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2) {
384 return get(Instruction::Sub, C1, C2);
386 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2) {
387 return get(Instruction::Mul, C1, C2);
389 Constant *ConstantExpr::getDiv(Constant *C1, Constant *C2) {
390 return get(Instruction::Div, C1, C2);
392 Constant *ConstantExpr::getRem(Constant *C1, Constant *C2) {
393 return get(Instruction::Rem, C1, C2);
395 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
396 return get(Instruction::And, C1, C2);
398 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
399 return get(Instruction::Or, C1, C2);
401 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
402 return get(Instruction::Xor, C1, C2);
404 Constant *ConstantExpr::getSetEQ(Constant *C1, Constant *C2) {
405 return get(Instruction::SetEQ, C1, C2);
407 Constant *ConstantExpr::getSetNE(Constant *C1, Constant *C2) {
408 return get(Instruction::SetNE, C1, C2);
410 Constant *ConstantExpr::getSetLT(Constant *C1, Constant *C2) {
411 return get(Instruction::SetLT, C1, C2);
413 Constant *ConstantExpr::getSetGT(Constant *C1, Constant *C2) {
414 return get(Instruction::SetGT, C1, C2);
416 Constant *ConstantExpr::getSetLE(Constant *C1, Constant *C2) {
417 return get(Instruction::SetLE, C1, C2);
419 Constant *ConstantExpr::getSetGE(Constant *C1, Constant *C2) {
420 return get(Instruction::SetGE, C1, C2);
422 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2) {
423 return get(Instruction::Shl, C1, C2);
425 Constant *ConstantExpr::getShr(Constant *C1, Constant *C2) {
426 return get(Instruction::Shr, C1, C2);
429 Constant *ConstantExpr::getUShr(Constant *C1, Constant *C2) {
430 if (C1->getType()->isUnsigned()) return getShr(C1, C2);
431 return getCast(getShr(getCast(C1,
432 C1->getType()->getUnsignedVersion()), C2), C1->getType());
435 Constant *ConstantExpr::getSShr(Constant *C1, Constant *C2) {
436 if (C1->getType()->isSigned()) return getShr(C1, C2);
437 return getCast(getShr(getCast(C1,
438 C1->getType()->getSignedVersion()), C2), C1->getType());
442 //===----------------------------------------------------------------------===//
443 // isValueValidForType implementations
445 bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) {
446 switch (Ty->getTypeID()) {
448 return false; // These can't be represented as integers!!!
450 case Type::SByteTyID:
451 return (Val <= INT8_MAX && Val >= INT8_MIN);
452 case Type::ShortTyID:
453 return (Val <= INT16_MAX && Val >= INT16_MIN);
455 return (Val <= int(INT32_MAX) && Val >= int(INT32_MIN));
457 return true; // This is the largest type...
461 bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) {
462 switch (Ty->getTypeID()) {
464 return false; // These can't be represented as integers!!!
467 case Type::UByteTyID:
468 return (Val <= UINT8_MAX);
469 case Type::UShortTyID:
470 return (Val <= UINT16_MAX);
472 return (Val <= UINT32_MAX);
473 case Type::ULongTyID:
474 return true; // This is the largest type...
478 bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
479 switch (Ty->getTypeID()) {
481 return false; // These can't be represented as floating point!
483 // TODO: Figure out how to test if a double can be cast to a float!
484 case Type::FloatTyID:
485 case Type::DoubleTyID:
486 return true; // This is the largest type...
490 //===----------------------------------------------------------------------===//
491 // replaceUsesOfWithOnConstant implementations
493 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
494 bool DisableChecking) {
495 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
497 std::vector<Constant*> Values;
498 Values.reserve(getNumOperands()); // Build replacement array...
499 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
500 Constant *Val = getOperand(i);
501 if (Val == From) Val = cast<Constant>(To);
502 Values.push_back(Val);
505 Constant *Replacement = ConstantArray::get(getType(), Values);
506 assert(Replacement != this && "I didn't contain From!");
508 // Everyone using this now uses the replacement...
510 uncheckedReplaceAllUsesWith(Replacement);
512 replaceAllUsesWith(Replacement);
514 // Delete the old constant!
518 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
519 bool DisableChecking) {
520 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
522 std::vector<Constant*> Values;
523 Values.reserve(getNumOperands()); // Build replacement array...
524 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
525 Constant *Val = getOperand(i);
526 if (Val == From) Val = cast<Constant>(To);
527 Values.push_back(Val);
530 Constant *Replacement = ConstantStruct::get(getType(), Values);
531 assert(Replacement != this && "I didn't contain From!");
533 // Everyone using this now uses the replacement...
535 uncheckedReplaceAllUsesWith(Replacement);
537 replaceAllUsesWith(Replacement);
539 // Delete the old constant!
543 void ConstantPacked::replaceUsesOfWithOnConstant(Value *From, Value *To,
544 bool DisableChecking) {
545 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
547 std::vector<Constant*> Values;
548 Values.reserve(getNumOperands()); // Build replacement array...
549 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
550 Constant *Val = getOperand(i);
551 if (Val == From) Val = cast<Constant>(To);
552 Values.push_back(Val);
555 Constant *Replacement = ConstantPacked::get(getType(), Values);
556 assert(Replacement != this && "I didn't contain From!");
558 // Everyone using this now uses the replacement...
560 uncheckedReplaceAllUsesWith(Replacement);
562 replaceAllUsesWith(Replacement);
564 // Delete the old constant!
568 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
569 bool DisableChecking) {
570 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
571 Constant *To = cast<Constant>(ToV);
573 Constant *Replacement = 0;
574 if (getOpcode() == Instruction::GetElementPtr) {
575 std::vector<Constant*> Indices;
576 Constant *Pointer = getOperand(0);
577 Indices.reserve(getNumOperands()-1);
578 if (Pointer == From) Pointer = To;
580 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
581 Constant *Val = getOperand(i);
582 if (Val == From) Val = To;
583 Indices.push_back(Val);
585 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices);
586 } else if (getOpcode() == Instruction::Cast) {
587 assert(getOperand(0) == From && "Cast only has one use!");
588 Replacement = ConstantExpr::getCast(To, getType());
589 } else if (getOpcode() == Instruction::Select) {
590 Constant *C1 = getOperand(0);
591 Constant *C2 = getOperand(1);
592 Constant *C3 = getOperand(2);
593 if (C1 == From) C1 = To;
594 if (C2 == From) C2 = To;
595 if (C3 == From) C3 = To;
596 Replacement = ConstantExpr::getSelect(C1, C2, C3);
597 } else if (getNumOperands() == 2) {
598 Constant *C1 = getOperand(0);
599 Constant *C2 = getOperand(1);
600 if (C1 == From) C1 = To;
601 if (C2 == From) C2 = To;
602 Replacement = ConstantExpr::get(getOpcode(), C1, C2);
604 assert(0 && "Unknown ConstantExpr type!");
608 assert(Replacement != this && "I didn't contain From!");
610 // Everyone using this now uses the replacement...
612 uncheckedReplaceAllUsesWith(Replacement);
614 replaceAllUsesWith(Replacement);
616 // Delete the old constant!
620 //===----------------------------------------------------------------------===//
621 // Factory Function Implementation
623 // ConstantCreator - A class that is used to create constants by
624 // ValueMap*. This class should be partially specialized if there is
625 // something strange that needs to be done to interface to the ctor for the
629 template<class ConstantClass, class TypeClass, class ValType>
630 struct ConstantCreator {
631 static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
632 return new ConstantClass(Ty, V);
636 template<class ConstantClass, class TypeClass>
637 struct ConvertConstantType {
638 static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
639 assert(0 && "This type cannot be converted!\n");
646 template<class ValType, class TypeClass, class ConstantClass>
647 class ValueMap : public AbstractTypeUser {
648 typedef std::pair<const TypeClass*, ValType> MapKey;
649 typedef std::map<MapKey, ConstantClass *> MapTy;
650 typedef typename MapTy::iterator MapIterator;
653 typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
654 AbstractTypeMapTy AbstractTypeMap;
656 friend void Constant::clearAllValueMaps();
658 void clear(std::vector<Constant *> &Constants) {
659 for(MapIterator I = Map.begin(); I != Map.end(); ++I)
660 Constants.push_back(I->second);
662 AbstractTypeMap.clear();
666 // getOrCreate - Return the specified constant from the map, creating it if
668 ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
669 MapKey Lookup(Ty, V);
670 MapIterator I = Map.lower_bound(Lookup);
671 if (I != Map.end() && I->first == Lookup)
672 return I->second; // Is it in the map?
674 // If no preexisting value, create one now...
675 ConstantClass *Result =
676 ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V);
679 /// FIXME: why does this assert fail when loading 176.gcc?
680 //assert(Result->getType() == Ty && "Type specified is not correct!");
681 I = Map.insert(I, std::make_pair(MapKey(Ty, V), Result));
683 // If the type of the constant is abstract, make sure that an entry exists
684 // for it in the AbstractTypeMap.
685 if (Ty->isAbstract()) {
686 typename AbstractTypeMapTy::iterator TI =
687 AbstractTypeMap.lower_bound(Ty);
689 if (TI == AbstractTypeMap.end() || TI->first != Ty) {
690 // Add ourselves to the ATU list of the type.
691 cast<DerivedType>(Ty)->addAbstractTypeUser(this);
693 AbstractTypeMap.insert(TI, std::make_pair(Ty, I));
699 void remove(ConstantClass *CP) {
700 MapIterator I = Map.find(MapKey((TypeClass*)CP->getRawType(),
702 if (I == Map.end() || I->second != CP) {
703 // FIXME: This should not use a linear scan. If this gets to be a
704 // performance problem, someone should look at this.
705 for (I = Map.begin(); I != Map.end() && I->second != CP; ++I)
709 assert(I != Map.end() && "Constant not found in constant table!");
710 assert(I->second == CP && "Didn't find correct element?");
712 // Now that we found the entry, make sure this isn't the entry that
713 // the AbstractTypeMap points to.
714 const TypeClass *Ty = I->first.first;
715 if (Ty->isAbstract()) {
716 assert(AbstractTypeMap.count(Ty) &&
717 "Abstract type not in AbstractTypeMap?");
718 MapIterator &ATMEntryIt = AbstractTypeMap[Ty];
719 if (ATMEntryIt == I) {
720 // Yes, we are removing the representative entry for this type.
721 // See if there are any other entries of the same type.
722 MapIterator TmpIt = ATMEntryIt;
724 // First check the entry before this one...
725 if (TmpIt != Map.begin()) {
727 if (TmpIt->first.first != Ty) // Not the same type, move back...
731 // If we didn't find the same type, try to move forward...
732 if (TmpIt == ATMEntryIt) {
734 if (TmpIt == Map.end() || TmpIt->first.first != Ty)
735 --TmpIt; // No entry afterwards with the same type
738 // If there is another entry in the map of the same abstract type,
739 // update the AbstractTypeMap entry now.
740 if (TmpIt != ATMEntryIt) {
743 // Otherwise, we are removing the last instance of this type
744 // from the table. Remove from the ATM, and from user list.
745 cast<DerivedType>(Ty)->removeAbstractTypeUser(this);
746 AbstractTypeMap.erase(Ty);
754 void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
755 typename AbstractTypeMapTy::iterator I =
756 AbstractTypeMap.find(cast<TypeClass>(OldTy));
758 assert(I != AbstractTypeMap.end() &&
759 "Abstract type not in AbstractTypeMap?");
761 // Convert a constant at a time until the last one is gone. The last one
762 // leaving will remove() itself, causing the AbstractTypeMapEntry to be
763 // eliminated eventually.
765 ConvertConstantType<ConstantClass,
766 TypeClass>::convert(I->second->second,
767 cast<TypeClass>(NewTy));
769 I = AbstractTypeMap.find(cast<TypeClass>(OldTy));
770 } while (I != AbstractTypeMap.end());
773 // If the type became concrete without being refined to any other existing
774 // type, we just remove ourselves from the ATU list.
775 void typeBecameConcrete(const DerivedType *AbsTy) {
776 AbsTy->removeAbstractTypeUser(this);
780 std::cerr << "Constant.cpp: ValueMap\n";
785 //---- ConstantUInt::get() and ConstantSInt::get() implementations...
787 static ValueMap< int64_t, Type, ConstantSInt> SIntConstants;
788 static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants;
790 ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
791 return SIntConstants.getOrCreate(Ty, V);
794 ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
795 return UIntConstants.getOrCreate(Ty, V);
798 ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
799 assert(V <= 127 && "Can only be used with very small positive constants!");
800 if (Ty->isSigned()) return ConstantSInt::get(Ty, V);
801 return ConstantUInt::get(Ty, V);
804 //---- ConstantFP::get() implementation...
808 struct ConstantCreator<ConstantFP, Type, uint64_t> {
809 static ConstantFP *create(const Type *Ty, uint64_t V) {
810 assert(Ty == Type::DoubleTy);
811 return new ConstantFP(Ty, BitsToDouble(V));
815 struct ConstantCreator<ConstantFP, Type, uint32_t> {
816 static ConstantFP *create(const Type *Ty, uint32_t V) {
817 assert(Ty == Type::FloatTy);
818 return new ConstantFP(Ty, BitsToFloat(V));
823 static ValueMap<uint64_t, Type, ConstantFP> DoubleConstants;
824 static ValueMap<uint32_t, Type, ConstantFP> FloatConstants;
826 bool ConstantFP::isNullValue() const {
827 return DoubleToBits(Val) == 0;
830 bool ConstantFP::isExactlyValue(double V) const {
831 return DoubleToBits(V) == DoubleToBits(Val);
835 ConstantFP *ConstantFP::get(const Type *Ty, double V) {
836 if (Ty == Type::FloatTy) {
837 // Force the value through memory to normalize it.
838 return FloatConstants.getOrCreate(Ty, FloatToBits(V));
840 assert(Ty == Type::DoubleTy);
841 return DoubleConstants.getOrCreate(Ty, DoubleToBits(V));
845 //---- ConstantAggregateZero::get() implementation...
848 // ConstantAggregateZero does not take extra "value" argument...
849 template<class ValType>
850 struct ConstantCreator<ConstantAggregateZero, Type, ValType> {
851 static ConstantAggregateZero *create(const Type *Ty, const ValType &V){
852 return new ConstantAggregateZero(Ty);
857 struct ConvertConstantType<ConstantAggregateZero, Type> {
858 static void convert(ConstantAggregateZero *OldC, const Type *NewTy) {
859 // Make everyone now use a constant of the new type...
860 Constant *New = ConstantAggregateZero::get(NewTy);
861 assert(New != OldC && "Didn't replace constant??");
862 OldC->uncheckedReplaceAllUsesWith(New);
863 OldC->destroyConstant(); // This constant is now dead, destroy it.
868 static ValueMap<char, Type, ConstantAggregateZero> AggZeroConstants;
870 static char getValType(ConstantAggregateZero *CPZ) { return 0; }
872 Constant *ConstantAggregateZero::get(const Type *Ty) {
873 return AggZeroConstants.getOrCreate(Ty, 0);
876 // destroyConstant - Remove the constant from the constant table...
878 void ConstantAggregateZero::destroyConstant() {
879 AggZeroConstants.remove(this);
880 destroyConstantImpl();
883 void ConstantAggregateZero::replaceUsesOfWithOnConstant(Value *From, Value *To,
884 bool DisableChecking) {
885 assert(0 && "No uses!");
891 //---- ConstantArray::get() implementation...
895 struct ConvertConstantType<ConstantArray, ArrayType> {
896 static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
897 // Make everyone now use a constant of the new type...
898 std::vector<Constant*> C;
899 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
900 C.push_back(cast<Constant>(OldC->getOperand(i)));
901 Constant *New = ConstantArray::get(NewTy, C);
902 assert(New != OldC && "Didn't replace constant??");
903 OldC->uncheckedReplaceAllUsesWith(New);
904 OldC->destroyConstant(); // This constant is now dead, destroy it.
909 static std::vector<Constant*> getValType(ConstantArray *CA) {
910 std::vector<Constant*> Elements;
911 Elements.reserve(CA->getNumOperands());
912 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
913 Elements.push_back(cast<Constant>(CA->getOperand(i)));
917 static ValueMap<std::vector<Constant*>, ArrayType,
918 ConstantArray> ArrayConstants;
920 Constant *ConstantArray::get(const ArrayType *Ty,
921 const std::vector<Constant*> &V) {
922 // If this is an all-zero array, return a ConstantAggregateZero object
925 if (!C->isNullValue())
926 return ArrayConstants.getOrCreate(Ty, V);
927 for (unsigned i = 1, e = V.size(); i != e; ++i)
929 return ArrayConstants.getOrCreate(Ty, V);
931 return ConstantAggregateZero::get(Ty);
934 // destroyConstant - Remove the constant from the constant table...
936 void ConstantArray::destroyConstant() {
937 ArrayConstants.remove(this);
938 destroyConstantImpl();
941 // ConstantArray::get(const string&) - Return an array that is initialized to
942 // contain the specified string. A null terminator is added to the specified
943 // string so that it may be used in a natural way...
945 Constant *ConstantArray::get(const std::string &Str) {
946 std::vector<Constant*> ElementVals;
948 for (unsigned i = 0; i < Str.length(); ++i)
949 ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i]));
951 // Add a null terminator to the string...
952 ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0));
954 ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1);
955 return ConstantArray::get(ATy, ElementVals);
958 /// isString - This method returns true if the array is an array of sbyte or
959 /// ubyte, and if the elements of the array are all ConstantInt's.
960 bool ConstantArray::isString() const {
961 // Check the element type for sbyte or ubyte...
962 if (getType()->getElementType() != Type::UByteTy &&
963 getType()->getElementType() != Type::SByteTy)
965 // Check the elements to make sure they are all integers, not constant
967 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
968 if (!isa<ConstantInt>(getOperand(i)))
973 // getAsString - If the sub-element type of this array is either sbyte or ubyte,
974 // then this method converts the array to an std::string and returns it.
975 // Otherwise, it asserts out.
977 std::string ConstantArray::getAsString() const {
978 assert(isString() && "Not a string!");
980 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
981 Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue();
986 //---- ConstantStruct::get() implementation...
991 struct ConvertConstantType<ConstantStruct, StructType> {
992 static void convert(ConstantStruct *OldC, const StructType *NewTy) {
993 // Make everyone now use a constant of the new type...
994 std::vector<Constant*> C;
995 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
996 C.push_back(cast<Constant>(OldC->getOperand(i)));
997 Constant *New = ConstantStruct::get(NewTy, C);
998 assert(New != OldC && "Didn't replace constant??");
1000 OldC->uncheckedReplaceAllUsesWith(New);
1001 OldC->destroyConstant(); // This constant is now dead, destroy it.
1006 static ValueMap<std::vector<Constant*>, StructType,
1007 ConstantStruct> StructConstants;
1009 static std::vector<Constant*> getValType(ConstantStruct *CS) {
1010 std::vector<Constant*> Elements;
1011 Elements.reserve(CS->getNumOperands());
1012 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i)
1013 Elements.push_back(cast<Constant>(CS->getOperand(i)));
1017 Constant *ConstantStruct::get(const StructType *Ty,
1018 const std::vector<Constant*> &V) {
1019 // Create a ConstantAggregateZero value if all elements are zeros...
1020 for (unsigned i = 0, e = V.size(); i != e; ++i)
1021 if (!V[i]->isNullValue())
1022 return StructConstants.getOrCreate(Ty, V);
1024 return ConstantAggregateZero::get(Ty);
1027 Constant *ConstantStruct::get(const std::vector<Constant*> &V) {
1028 std::vector<const Type*> StructEls;
1029 StructEls.reserve(V.size());
1030 for (unsigned i = 0, e = V.size(); i != e; ++i)
1031 StructEls.push_back(V[i]->getType());
1032 return get(StructType::get(StructEls), V);
1035 // destroyConstant - Remove the constant from the constant table...
1037 void ConstantStruct::destroyConstant() {
1038 StructConstants.remove(this);
1039 destroyConstantImpl();
1042 //---- ConstantPacked::get() implementation...
1046 struct ConvertConstantType<ConstantPacked, PackedType> {
1047 static void convert(ConstantPacked *OldC, const PackedType *NewTy) {
1048 // Make everyone now use a constant of the new type...
1049 std::vector<Constant*> C;
1050 for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
1051 C.push_back(cast<Constant>(OldC->getOperand(i)));
1052 Constant *New = ConstantPacked::get(NewTy, C);
1053 assert(New != OldC && "Didn't replace constant??");
1054 OldC->uncheckedReplaceAllUsesWith(New);
1055 OldC->destroyConstant(); // This constant is now dead, destroy it.
1060 static std::vector<Constant*> getValType(ConstantPacked *CP) {
1061 std::vector<Constant*> Elements;
1062 Elements.reserve(CP->getNumOperands());
1063 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1064 Elements.push_back(CP->getOperand(i));
1068 static ValueMap<std::vector<Constant*>, PackedType,
1069 ConstantPacked> PackedConstants;
1071 Constant *ConstantPacked::get(const PackedType *Ty,
1072 const std::vector<Constant*> &V) {
1073 // If this is an all-zero packed, return a ConstantAggregateZero object
1076 if (!C->isNullValue())
1077 return PackedConstants.getOrCreate(Ty, V);
1078 for (unsigned i = 1, e = V.size(); i != e; ++i)
1080 return PackedConstants.getOrCreate(Ty, V);
1082 return ConstantAggregateZero::get(Ty);
1085 Constant *ConstantPacked::get(const std::vector<Constant*> &V) {
1086 assert(!V.empty() && "Cannot infer type if V is empty");
1087 return get(PackedType::get(V.front()->getType(),V.size()), V);
1090 // destroyConstant - Remove the constant from the constant table...
1092 void ConstantPacked::destroyConstant() {
1093 PackedConstants.remove(this);
1094 destroyConstantImpl();
1097 //---- ConstantPointerNull::get() implementation...
1101 // ConstantPointerNull does not take extra "value" argument...
1102 template<class ValType>
1103 struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
1104 static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
1105 return new ConstantPointerNull(Ty);
1110 struct ConvertConstantType<ConstantPointerNull, PointerType> {
1111 static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
1112 // Make everyone now use a constant of the new type...
1113 Constant *New = ConstantPointerNull::get(NewTy);
1114 assert(New != OldC && "Didn't replace constant??");
1115 OldC->uncheckedReplaceAllUsesWith(New);
1116 OldC->destroyConstant(); // This constant is now dead, destroy it.
1121 static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
1123 static char getValType(ConstantPointerNull *) {
1128 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1129 return NullPtrConstants.getOrCreate(Ty, 0);
1132 // destroyConstant - Remove the constant from the constant table...
1134 void ConstantPointerNull::destroyConstant() {
1135 NullPtrConstants.remove(this);
1136 destroyConstantImpl();
1140 //---- UndefValue::get() implementation...
1144 // UndefValue does not take extra "value" argument...
1145 template<class ValType>
1146 struct ConstantCreator<UndefValue, Type, ValType> {
1147 static UndefValue *create(const Type *Ty, const ValType &V) {
1148 return new UndefValue(Ty);
1153 struct ConvertConstantType<UndefValue, Type> {
1154 static void convert(UndefValue *OldC, const Type *NewTy) {
1155 // Make everyone now use a constant of the new type.
1156 Constant *New = UndefValue::get(NewTy);
1157 assert(New != OldC && "Didn't replace constant??");
1158 OldC->uncheckedReplaceAllUsesWith(New);
1159 OldC->destroyConstant(); // This constant is now dead, destroy it.
1164 static ValueMap<char, Type, UndefValue> UndefValueConstants;
1166 static char getValType(UndefValue *) {
1171 UndefValue *UndefValue::get(const Type *Ty) {
1172 return UndefValueConstants.getOrCreate(Ty, 0);
1175 // destroyConstant - Remove the constant from the constant table.
1177 void UndefValue::destroyConstant() {
1178 UndefValueConstants.remove(this);
1179 destroyConstantImpl();
1185 //---- ConstantExpr::get() implementations...
1187 typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;
1191 struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
1192 static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) {
1193 if (V.first == Instruction::Cast)
1194 return new UnaryConstantExpr(Instruction::Cast, V.second[0], Ty);
1195 if ((V.first >= Instruction::BinaryOpsBegin &&
1196 V.first < Instruction::BinaryOpsEnd) ||
1197 V.first == Instruction::Shl || V.first == Instruction::Shr)
1198 return new BinaryConstantExpr(V.first, V.second[0], V.second[1]);
1199 if (V.first == Instruction::Select)
1200 return new SelectConstantExpr(V.second[0], V.second[1], V.second[2]);
1202 assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!");
1204 std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
1205 return new GetElementPtrConstantExpr(V.second[0], IdxList, Ty);
1210 struct ConvertConstantType<ConstantExpr, Type> {
1211 static void convert(ConstantExpr *OldC, const Type *NewTy) {
1213 switch (OldC->getOpcode()) {
1214 case Instruction::Cast:
1215 New = ConstantExpr::getCast(OldC->getOperand(0), NewTy);
1217 case Instruction::Select:
1218 New = ConstantExpr::getSelectTy(NewTy, OldC->getOperand(0),
1219 OldC->getOperand(1),
1220 OldC->getOperand(2));
1222 case Instruction::Shl:
1223 case Instruction::Shr:
1224 New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
1225 OldC->getOperand(0), OldC->getOperand(1));
1228 assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
1229 OldC->getOpcode() < Instruction::BinaryOpsEnd);
1230 New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
1231 OldC->getOperand(1));
1233 case Instruction::GetElementPtr:
1234 // Make everyone now use a constant of the new type...
1235 std::vector<Value*> Idx(OldC->op_begin()+1, OldC->op_end());
1236 New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), Idx);
1240 assert(New != OldC && "Didn't replace constant??");
1241 OldC->uncheckedReplaceAllUsesWith(New);
1242 OldC->destroyConstant(); // This constant is now dead, destroy it.
1245 } // end namespace llvm
1248 static ExprMapKeyType getValType(ConstantExpr *CE) {
1249 std::vector<Constant*> Operands;
1250 Operands.reserve(CE->getNumOperands());
1251 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1252 Operands.push_back(cast<Constant>(CE->getOperand(i)));
1253 return ExprMapKeyType(CE->getOpcode(), Operands);
1256 static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants;
1258 Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) {
1259 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1261 if (Constant *FC = ConstantFoldCastInstruction(C, Ty))
1262 return FC; // Fold a few common cases...
1264 // Look up the constant in the table first to ensure uniqueness
1265 std::vector<Constant*> argVec(1, C);
1266 ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec);
1267 return ExprConstants.getOrCreate(Ty, Key);
1270 Constant *ConstantExpr::getSignExtend(Constant *C, const Type *Ty) {
1271 assert(C->getType()->isIntegral() && Ty->isIntegral() &&
1272 C->getType()->getPrimitiveSize() <= Ty->getPrimitiveSize() &&
1273 "This is an illegal sign extension!");
1274 if (C->getType() != Type::BoolTy) {
1275 C = ConstantExpr::getCast(C, C->getType()->getSignedVersion());
1276 return ConstantExpr::getCast(C, Ty);
1278 if (C == ConstantBool::True)
1279 return ConstantIntegral::getAllOnesValue(Ty);
1281 return ConstantIntegral::getNullValue(Ty);
1285 Constant *ConstantExpr::getZeroExtend(Constant *C, const Type *Ty) {
1286 assert(C->getType()->isIntegral() && Ty->isIntegral() &&
1287 C->getType()->getPrimitiveSize() <= Ty->getPrimitiveSize() &&
1288 "This is an illegal zero extension!");
1289 if (C->getType() != Type::BoolTy)
1290 C = ConstantExpr::getCast(C, C->getType()->getUnsignedVersion());
1291 return ConstantExpr::getCast(C, Ty);
1294 Constant *ConstantExpr::getSizeOf(const Type *Ty) {
1295 // sizeof is implemented as: (ulong) gep (Ty*)null, 1
1297 getGetElementPtr(getNullValue(PointerType::get(Ty)),
1298 std::vector<Constant*>(1, ConstantInt::get(Type::UIntTy, 1))),
1302 Constant *ConstantExpr::getPtrPtrFromArrayPtr(Constant *C) {
1303 // pointer from array is implemented as: getelementptr arr ptr, 0, 0
1304 static std::vector<Constant*> Indices(2, ConstantUInt::get(Type::UIntTy, 0));
1306 return ConstantExpr::getGetElementPtr(C, Indices);
1309 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1310 Constant *C1, Constant *C2) {
1311 if (Opcode == Instruction::Shl || Opcode == Instruction::Shr)
1312 return getShiftTy(ReqTy, Opcode, C1, C2);
1313 // Check the operands for consistency first
1314 assert((Opcode >= Instruction::BinaryOpsBegin &&
1315 Opcode < Instruction::BinaryOpsEnd) &&
1316 "Invalid opcode in binary constant expression");
1317 assert(C1->getType() == C2->getType() &&
1318 "Operand types in binary constant expression should match");
1320 if (ReqTy == C1->getType() || (Instruction::isRelational(Opcode) &&
1321 ReqTy == Type::BoolTy))
1322 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1323 return FC; // Fold a few common cases...
1325 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1326 ExprMapKeyType Key = std::make_pair(Opcode, argVec);
1327 return ExprConstants.getOrCreate(ReqTy, Key);
1330 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
1333 case Instruction::Add: case Instruction::Sub:
1334 case Instruction::Mul: case Instruction::Div:
1335 case Instruction::Rem:
1336 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1337 assert((C1->getType()->isInteger() || C1->getType()->isFloatingPoint()) &&
1338 "Tried to create an arithmetic operation on a non-arithmetic type!");
1340 case Instruction::And:
1341 case Instruction::Or:
1342 case Instruction::Xor:
1343 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1344 assert(C1->getType()->isIntegral() &&
1345 "Tried to create a logical operation on a non-integral type!");
1347 case Instruction::SetLT: case Instruction::SetGT: case Instruction::SetLE:
1348 case Instruction::SetGE: case Instruction::SetEQ: case Instruction::SetNE:
1349 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1351 case Instruction::Shl:
1352 case Instruction::Shr:
1353 assert(C2->getType() == Type::UByteTy && "Shift should be by ubyte!");
1354 assert(C1->getType()->isInteger() &&
1355 "Tried to create a shift operation on a non-integer type!");
1362 if (Instruction::isRelational(Opcode))
1363 return getTy(Type::BoolTy, Opcode, C1, C2);
1365 return getTy(C1->getType(), Opcode, C1, C2);
1368 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1369 Constant *V1, Constant *V2) {
1370 assert(C->getType() == Type::BoolTy && "Select condition must be bool!");
1371 assert(V1->getType() == V2->getType() && "Select value types must match!");
1372 assert(V1->getType()->isFirstClassType() && "Cannot select aggregate type!");
1374 if (ReqTy == V1->getType())
1375 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1376 return SC; // Fold common cases
1378 std::vector<Constant*> argVec(3, C);
1381 ExprMapKeyType Key = std::make_pair(Instruction::Select, argVec);
1382 return ExprConstants.getOrCreate(ReqTy, Key);
1385 /// getShiftTy - Return a shift left or shift right constant expr
1386 Constant *ConstantExpr::getShiftTy(const Type *ReqTy, unsigned Opcode,
1387 Constant *C1, Constant *C2) {
1388 // Check the operands for consistency first
1389 assert((Opcode == Instruction::Shl ||
1390 Opcode == Instruction::Shr) &&
1391 "Invalid opcode in binary constant expression");
1392 assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy &&
1393 "Invalid operand types for Shift constant expr!");
1395 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1396 return FC; // Fold a few common cases...
1398 // Look up the constant in the table first to ensure uniqueness
1399 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1400 ExprMapKeyType Key = std::make_pair(Opcode, argVec);
1401 return ExprConstants.getOrCreate(ReqTy, Key);
1405 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1406 const std::vector<Value*> &IdxList) {
1407 assert(GetElementPtrInst::getIndexedType(C->getType(), IdxList, true) &&
1408 "GEP indices invalid!");
1410 if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
1411 return FC; // Fold a few common cases...
1413 assert(isa<PointerType>(C->getType()) &&
1414 "Non-pointer type for constant GetElementPtr expression");
1415 // Look up the constant in the table first to ensure uniqueness
1416 std::vector<Constant*> ArgVec;
1417 ArgVec.reserve(IdxList.size()+1);
1418 ArgVec.push_back(C);
1419 for (unsigned i = 0, e = IdxList.size(); i != e; ++i)
1420 ArgVec.push_back(cast<Constant>(IdxList[i]));
1421 const ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,ArgVec);
1422 return ExprConstants.getOrCreate(ReqTy, Key);
1425 Constant *ConstantExpr::getGetElementPtr(Constant *C,
1426 const std::vector<Constant*> &IdxList){
1427 // Get the result type of the getelementptr!
1428 std::vector<Value*> VIdxList(IdxList.begin(), IdxList.end());
1430 const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), VIdxList,
1432 assert(Ty && "GEP indices invalid!");
1433 return getGetElementPtrTy(PointerType::get(Ty), C, VIdxList);
1436 Constant *ConstantExpr::getGetElementPtr(Constant *C,
1437 const std::vector<Value*> &IdxList) {
1438 // Get the result type of the getelementptr!
1439 const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), IdxList,
1441 assert(Ty && "GEP indices invalid!");
1442 return getGetElementPtrTy(PointerType::get(Ty), C, IdxList);
1446 // destroyConstant - Remove the constant from the constant table...
1448 void ConstantExpr::destroyConstant() {
1449 ExprConstants.remove(this);
1450 destroyConstantImpl();
1453 const char *ConstantExpr::getOpcodeName() const {
1454 return Instruction::getOpcodeName(getOpcode());
1457 /// clearAllValueMaps - This method frees all internal memory used by the
1458 /// constant subsystem, which can be used in environments where this memory
1459 /// is otherwise reported as a leak.
1460 void Constant::clearAllValueMaps() {
1461 std::vector<Constant *> Constants;
1463 DoubleConstants.clear(Constants);
1464 FloatConstants.clear(Constants);
1465 SIntConstants.clear(Constants);
1466 UIntConstants.clear(Constants);
1467 AggZeroConstants.clear(Constants);
1468 ArrayConstants.clear(Constants);
1469 StructConstants.clear(Constants);
1470 PackedConstants.clear(Constants);
1471 NullPtrConstants.clear(Constants);
1472 UndefValueConstants.clear(Constants);
1473 ExprConstants.clear(Constants);
1475 for (std::vector<Constant *>::iterator I = Constants.begin(),
1476 E = Constants.end(); I != E; ++I)
1477 (*I)->dropAllReferences();
1478 for (std::vector<Constant *>::iterator I = Constants.begin(),
1479 E = Constants.end(); I != E; ++I)
1480 (*I)->destroyConstantImpl();