1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // This file implements the Constant* classes...
5 //===----------------------------------------------------------------------===//
7 #include "llvm/Constants.h"
8 #include "llvm/ConstantHandling.h"
9 #include "llvm/DerivedTypes.h"
10 #include "llvm/iMemory.h"
11 #include "llvm/SymbolTable.h"
12 #include "llvm/Module.h"
13 #include "Support/StringExtras.h"
16 ConstantBool *ConstantBool::True = new ConstantBool(true);
17 ConstantBool *ConstantBool::False = new ConstantBool(false);
20 //===----------------------------------------------------------------------===//
22 //===----------------------------------------------------------------------===//
24 // Specialize setName to take care of symbol table majik
25 void Constant::setName(const std::string &Name, SymbolTable *ST) {
26 assert(ST && "Type::setName - Must provide symbol table argument!");
28 if (Name.size()) ST->insert(Name, this);
31 void Constant::destroyConstantImpl() {
32 // When a Constant is destroyed, there may be lingering
33 // references to the constant by other constants in the constant pool. These
34 // constants are implicitly dependent on the module that is being deleted,
35 // but they don't know that. Because we only find out when the CPV is
36 // deleted, we must now notify all of our users (that should only be
37 // Constants) that they are, in fact, invalid now and should be deleted.
39 while (!use_empty()) {
40 Value *V = use_back();
41 #ifndef NDEBUG // Only in -g mode...
42 if (!isa<Constant>(V))
43 std::cerr << "While deleting: " << *this
44 << "\n\nUse still stuck around after Def is destroyed: "
47 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
48 Constant *CPV = cast<Constant>(V);
49 CPV->destroyConstant();
51 // The constant should remove itself from our use list...
52 assert((use_empty() || use_back() != V) && "Constant not removed!");
55 // Value has no outstanding references it is safe to delete it now...
59 // Static constructor to create a '0' constant of arbitrary type...
60 Constant *Constant::getNullValue(const Type *Ty) {
61 switch (Ty->getPrimitiveID()) {
62 case Type::BoolTyID: {
63 static Constant *NullBool = ConstantBool::get(false);
66 case Type::SByteTyID: {
67 static Constant *NullSByte = ConstantSInt::get(Type::SByteTy, 0);
70 case Type::UByteTyID: {
71 static Constant *NullUByte = ConstantUInt::get(Type::UByteTy, 0);
74 case Type::ShortTyID: {
75 static Constant *NullShort = ConstantSInt::get(Type::ShortTy, 0);
78 case Type::UShortTyID: {
79 static Constant *NullUShort = ConstantUInt::get(Type::UShortTy, 0);
83 static Constant *NullInt = ConstantSInt::get(Type::IntTy, 0);
86 case Type::UIntTyID: {
87 static Constant *NullUInt = ConstantUInt::get(Type::UIntTy, 0);
90 case Type::LongTyID: {
91 static Constant *NullLong = ConstantSInt::get(Type::LongTy, 0);
94 case Type::ULongTyID: {
95 static Constant *NullULong = ConstantUInt::get(Type::ULongTy, 0);
99 case Type::FloatTyID: {
100 static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
103 case Type::DoubleTyID: {
104 static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
108 case Type::PointerTyID:
109 return ConstantPointerNull::get(cast<PointerType>(Ty));
111 case Type::StructTyID: {
112 const StructType *ST = cast<StructType>(Ty);
113 const StructType::ElementTypes &ETs = ST->getElementTypes();
114 std::vector<Constant*> Elements;
115 Elements.resize(ETs.size());
116 for (unsigned i = 0, e = ETs.size(); i != e; ++i)
117 Elements[i] = Constant::getNullValue(ETs[i]);
118 return ConstantStruct::get(ST, Elements);
120 case Type::ArrayTyID: {
121 const ArrayType *AT = cast<ArrayType>(Ty);
122 Constant *El = Constant::getNullValue(AT->getElementType());
123 unsigned NumElements = AT->getNumElements();
124 return ConstantArray::get(AT, std::vector<Constant*>(NumElements, El));
127 // Function, Type, Label, or Opaque type?
128 assert(0 && "Cannot create a null constant of that type!");
133 // Static constructor to create the maximum constant of an integral type...
134 ConstantIntegral *ConstantIntegral::getMaxValue(const Type *Ty) {
135 switch (Ty->getPrimitiveID()) {
136 case Type::BoolTyID: return ConstantBool::True;
137 case Type::SByteTyID:
138 case Type::ShortTyID:
140 case Type::LongTyID: {
141 // Calculate 011111111111111...
142 unsigned TypeBits = Ty->getPrimitiveSize()*8;
143 int64_t Val = INT64_MAX; // All ones
144 Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
145 return ConstantSInt::get(Ty, Val);
148 case Type::UByteTyID:
149 case Type::UShortTyID:
151 case Type::ULongTyID: return getAllOnesValue(Ty);
157 // Static constructor to create the minimum constant for an integral type...
158 ConstantIntegral *ConstantIntegral::getMinValue(const Type *Ty) {
159 switch (Ty->getPrimitiveID()) {
160 case Type::BoolTyID: return ConstantBool::False;
161 case Type::SByteTyID:
162 case Type::ShortTyID:
164 case Type::LongTyID: {
165 // Calculate 1111111111000000000000
166 unsigned TypeBits = Ty->getPrimitiveSize()*8;
167 int64_t Val = -1; // All ones
168 Val <<= TypeBits-1; // Shift over to the right spot
169 return ConstantSInt::get(Ty, Val);
172 case Type::UByteTyID:
173 case Type::UShortTyID:
175 case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
181 // Static constructor to create an integral constant with all bits set
182 ConstantIntegral *ConstantIntegral::getAllOnesValue(const Type *Ty) {
183 switch (Ty->getPrimitiveID()) {
184 case Type::BoolTyID: return ConstantBool::True;
185 case Type::SByteTyID:
186 case Type::ShortTyID:
188 case Type::LongTyID: return ConstantSInt::get(Ty, -1);
190 case Type::UByteTyID:
191 case Type::UShortTyID:
193 case Type::ULongTyID: {
194 // Calculate ~0 of the right type...
195 unsigned TypeBits = Ty->getPrimitiveSize()*8;
196 uint64_t Val = ~0ULL; // All ones
197 Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
198 return ConstantUInt::get(Ty, Val);
204 bool ConstantUInt::isAllOnesValue() const {
205 unsigned TypeBits = getType()->getPrimitiveSize()*8;
206 uint64_t Val = ~0ULL; // All ones
207 Val >>= 64-TypeBits; // Shift out inappropriate bits
208 return getValue() == Val;
212 //===----------------------------------------------------------------------===//
213 // ConstantXXX Classes
214 //===----------------------------------------------------------------------===//
216 //===----------------------------------------------------------------------===//
217 // Normal Constructors
219 ConstantBool::ConstantBool(bool V) : ConstantIntegral(Type::BoolTy) {
223 ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : ConstantIntegral(Ty) {
227 ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
228 assert(Ty->isInteger() && Ty->isSigned() &&
229 "Illegal type for unsigned integer constant!");
230 assert(isValueValidForType(Ty, V) && "Value too large for type!");
233 ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, 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) : Constant(Ty) {
240 assert(isValueValidForType(Ty, V) && "Value too large for type!");
244 ConstantArray::ConstantArray(const ArrayType *T,
245 const std::vector<Constant*> &V) : Constant(T) {
246 Operands.reserve(V.size());
247 for (unsigned i = 0, e = V.size(); i != e; ++i) {
248 assert(V[i]->getType() == T->getElementType() ||
250 V[i]->getType()->getPrimitiveID() ==
251 T->getElementType()->getPrimitiveID()));
252 Operands.push_back(Use(V[i], this));
256 ConstantStruct::ConstantStruct(const StructType *T,
257 const std::vector<Constant*> &V) : Constant(T) {
258 const StructType::ElementTypes &ETypes = T->getElementTypes();
259 assert(V.size() == ETypes.size() &&
260 "Invalid initializer vector for constant structure");
261 Operands.reserve(V.size());
262 for (unsigned i = 0, e = V.size(); i != e; ++i) {
263 assert((V[i]->getType() == ETypes[i] ||
264 (ETypes[i]->isAbstract() &&
265 ETypes[i]->getPrimitiveID()==V[i]->getType()->getPrimitiveID())) &&
266 "Initializer for struct element doesn't match struct element type!");
267 Operands.push_back(Use(V[i], this));
271 ConstantPointerRef::ConstantPointerRef(GlobalValue *GV)
272 : ConstantPointer(GV->getType()) {
273 Operands.push_back(Use(GV, this));
276 ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
277 : Constant(Ty), iType(Opcode) {
278 Operands.push_back(Use(C, this));
281 static bool isSetCC(unsigned Opcode) {
282 return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE ||
283 Opcode == Instruction::SetLT || Opcode == Instruction::SetGT ||
284 Opcode == Instruction::SetLE || Opcode == Instruction::SetGE;
287 ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
288 : Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) {
289 Operands.push_back(Use(C1, this));
290 Operands.push_back(Use(C2, this));
293 ConstantExpr::ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
295 : Constant(DestTy), iType(Instruction::GetElementPtr) {
296 Operands.reserve(1+IdxList.size());
297 Operands.push_back(Use(C, this));
298 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
299 Operands.push_back(Use(IdxList[i], this));
304 //===----------------------------------------------------------------------===//
305 // classof implementations
307 bool ConstantIntegral::classof(const Constant *CPV) {
308 return CPV->getType()->isIntegral() && !isa<ConstantExpr>(CPV);
311 bool ConstantInt::classof(const Constant *CPV) {
312 return CPV->getType()->isInteger() && !isa<ConstantExpr>(CPV);
314 bool ConstantSInt::classof(const Constant *CPV) {
315 return CPV->getType()->isSigned() && !isa<ConstantExpr>(CPV);
317 bool ConstantUInt::classof(const Constant *CPV) {
318 return CPV->getType()->isUnsigned() && !isa<ConstantExpr>(CPV);
320 bool ConstantFP::classof(const Constant *CPV) {
321 const Type *Ty = CPV->getType();
322 return ((Ty == Type::FloatTy || Ty == Type::DoubleTy) &&
323 !isa<ConstantExpr>(CPV));
325 bool ConstantArray::classof(const Constant *CPV) {
326 return isa<ArrayType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
328 bool ConstantStruct::classof(const Constant *CPV) {
329 return isa<StructType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
331 bool ConstantPointer::classof(const Constant *CPV) {
332 return (isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV));
337 //===----------------------------------------------------------------------===//
338 // isValueValidForType implementations
340 bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) {
341 switch (Ty->getPrimitiveID()) {
343 return false; // These can't be represented as integers!!!
346 case Type::SByteTyID:
347 return (Val <= INT8_MAX && Val >= INT8_MIN);
348 case Type::ShortTyID:
349 return (Val <= INT16_MAX && Val >= INT16_MIN);
351 return (Val <= INT32_MAX && Val >= INT32_MIN);
353 return true; // This is the largest type...
359 bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) {
360 switch (Ty->getPrimitiveID()) {
362 return false; // These can't be represented as integers!!!
365 case Type::UByteTyID:
366 return (Val <= UINT8_MAX);
367 case Type::UShortTyID:
368 return (Val <= UINT16_MAX);
370 return (Val <= UINT32_MAX);
371 case Type::ULongTyID:
372 return true; // This is the largest type...
378 bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
379 switch (Ty->getPrimitiveID()) {
381 return false; // These can't be represented as floating point!
383 // TODO: Figure out how to test if a double can be cast to a float!
384 case Type::FloatTyID:
385 case Type::DoubleTyID:
386 return true; // This is the largest type...
390 //===----------------------------------------------------------------------===//
391 // replaceUsesOfWithOnConstant implementations
393 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
394 bool DisableChecking) {
395 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
397 std::vector<Constant*> Values;
398 Values.reserve(getValues().size()); // Build replacement array...
399 for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
400 Constant *Val = cast<Constant>(getValues()[i]);
401 if (Val == From) Val = cast<Constant>(To);
402 Values.push_back(Val);
405 ConstantArray *Replacement = ConstantArray::get(getType(), Values);
406 assert(Replacement != this && "I didn't contain From!");
408 // Everyone using this now uses the replacement...
410 uncheckedReplaceAllUsesWith(Replacement);
412 replaceAllUsesWith(Replacement);
414 // Delete the old constant!
418 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
419 bool DisableChecking) {
420 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
422 std::vector<Constant*> Values;
423 Values.reserve(getValues().size());
424 for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
425 Constant *Val = cast<Constant>(getValues()[i]);
426 if (Val == From) Val = cast<Constant>(To);
427 Values.push_back(Val);
430 ConstantStruct *Replacement = ConstantStruct::get(getType(), Values);
431 assert(Replacement != this && "I didn't contain From!");
433 // Everyone using this now uses the replacement...
435 uncheckedReplaceAllUsesWith(Replacement);
437 replaceAllUsesWith(Replacement);
439 // Delete the old constant!
443 void ConstantPointerRef::replaceUsesOfWithOnConstant(Value *From, Value *To,
444 bool DisableChecking) {
445 if (isa<GlobalValue>(To)) {
446 assert(From == getOperand(0) && "Doesn't contain from!");
447 ConstantPointerRef *Replacement =
448 ConstantPointerRef::get(cast<GlobalValue>(To));
450 // Everyone using this now uses the replacement...
452 uncheckedReplaceAllUsesWith(Replacement);
454 replaceAllUsesWith(Replacement);
457 // Just replace ourselves with the To value specified.
459 uncheckedReplaceAllUsesWith(To);
461 replaceAllUsesWith(To);
464 // Delete the old constant!
468 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
469 bool DisableChecking) {
470 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
471 Constant *To = cast<Constant>(ToV);
473 Constant *Replacement = 0;
474 if (getOpcode() == Instruction::GetElementPtr) {
475 std::vector<Constant*> Indices;
476 Constant *Pointer = getOperand(0);
477 Indices.reserve(getNumOperands()-1);
478 if (Pointer == From) Pointer = To;
480 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
481 Constant *Val = getOperand(i);
482 if (Val == From) Val = To;
483 Indices.push_back(Val);
485 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices);
486 } else if (getOpcode() == Instruction::Cast) {
487 assert(getOperand(0) == From && "Cast only has one use!");
488 Replacement = ConstantExpr::getCast(To, getType());
489 } else if (getNumOperands() == 2) {
490 Constant *C1 = getOperand(0);
491 Constant *C2 = getOperand(1);
492 if (C1 == From) C1 = To;
493 if (C2 == From) C2 = To;
494 Replacement = ConstantExpr::get(getOpcode(), C1, C2);
496 assert(0 && "Unknown ConstantExpr type!");
500 assert(Replacement != this && "I didn't contain From!");
502 // Everyone using this now uses the replacement...
504 uncheckedReplaceAllUsesWith(Replacement);
506 replaceAllUsesWith(Replacement);
508 // Delete the old constant!
512 //===----------------------------------------------------------------------===//
513 // Factory Function Implementation
515 // ConstantCreator - A class that is used to create constants by
516 // ValueMap*. This class should be partially specialized if there is
517 // something strange that needs to be done to interface to the ctor for the
520 template<class ConstantClass, class TypeClass, class ValType>
521 struct ConstantCreator {
522 static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
523 return new ConstantClass(Ty, V);
528 template<class ValType, class TypeClass, class ConstantClass>
531 typedef std::pair<const TypeClass*, ValType> ConstHashKey;
532 std::map<ConstHashKey, ConstantClass *> Map;
534 // getOrCreate - Return the specified constant from the map, creating it if
536 ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
537 ConstHashKey Lookup(Ty, V);
538 typename std::map<ConstHashKey,ConstantClass *>::iterator I =
539 Map.lower_bound(Lookup);
540 if (I != Map.end() && I->first == Lookup)
541 return I->second; // Is it in the map?
543 // If no preexisting value, create one now...
544 ConstantClass *Result =
545 ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V);
547 Map.insert(I, std::make_pair(ConstHashKey(Ty, V), Result));
551 void remove(ConstantClass *CP) {
552 // FIXME: This could be sped up a LOT. If this gets to be a performance
553 // problem, someone should look at this.
554 for (typename std::map<ConstHashKey, ConstantClass*>::iterator
555 I = Map.begin(), E = Map.end(); I != E; ++I)
556 if (I->second == CP) {
560 assert(0 && "Constant not found in constant table!");
567 //---- ConstantUInt::get() and ConstantSInt::get() implementations...
569 static ValueMap< int64_t, Type, ConstantSInt> SIntConstants;
570 static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants;
572 ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
573 return SIntConstants.getOrCreate(Ty, V);
576 ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
577 return UIntConstants.getOrCreate(Ty, V);
580 ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
581 assert(V <= 127 && "Can only be used with very small positive constants!");
582 if (Ty->isSigned()) return ConstantSInt::get(Ty, V);
583 return ConstantUInt::get(Ty, V);
586 //---- ConstantFP::get() implementation...
588 static ValueMap<double, Type, ConstantFP> FPConstants;
590 ConstantFP *ConstantFP::get(const Type *Ty, double V) {
591 return FPConstants.getOrCreate(Ty, V);
594 //---- ConstantArray::get() implementation...
596 static ValueMap<std::vector<Constant*>, ArrayType,
597 ConstantArray> ArrayConstants;
599 ConstantArray *ConstantArray::get(const ArrayType *Ty,
600 const std::vector<Constant*> &V) {
601 return ArrayConstants.getOrCreate(Ty, V);
604 // destroyConstant - Remove the constant from the constant table...
606 void ConstantArray::destroyConstant() {
607 ArrayConstants.remove(this);
608 destroyConstantImpl();
612 /// refineAbstractType - If this callback is invoked, then this constant is of a
613 /// derived type, change all users to use a concrete constant of the new type.
615 void ConstantArray::refineAbstractType(const DerivedType *OldTy,
617 if (OldTy == NewTy) return;
619 // Make everyone now use a constant of the new type...
620 std::vector<Constant*> C;
621 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
622 C.push_back(cast<Constant>(getOperand(i)));
623 Constant *New = ConstantArray::get(cast<ArrayType>(NewTy), C);
625 uncheckedReplaceAllUsesWith(New);
626 destroyConstant(); // This constant is now dead, destroy it.
631 // ConstantArray::get(const string&) - Return an array that is initialized to
632 // contain the specified string. A null terminator is added to the specified
633 // string so that it may be used in a natural way...
635 ConstantArray *ConstantArray::get(const std::string &Str) {
636 std::vector<Constant*> ElementVals;
638 for (unsigned i = 0; i < Str.length(); ++i)
639 ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i]));
641 // Add a null terminator to the string...
642 ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0));
644 ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1);
645 return ConstantArray::get(ATy, ElementVals);
648 // getAsString - If the sub-element type of this array is either sbyte or ubyte,
649 // then this method converts the array to an std::string and returns it.
650 // Otherwise, it asserts out.
652 std::string ConstantArray::getAsString() const {
653 assert((getType()->getElementType() == Type::UByteTy ||
654 getType()->getElementType() == Type::SByteTy) && "Not a string!");
657 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
658 Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue();
663 //---- ConstantStruct::get() implementation...
665 static ValueMap<std::vector<Constant*>, StructType,
666 ConstantStruct> StructConstants;
668 ConstantStruct *ConstantStruct::get(const StructType *Ty,
669 const std::vector<Constant*> &V) {
670 return StructConstants.getOrCreate(Ty, V);
673 // destroyConstant - Remove the constant from the constant table...
675 void ConstantStruct::destroyConstant() {
676 StructConstants.remove(this);
677 destroyConstantImpl();
681 /// refineAbstractType - If this callback is invoked, then this constant is of a
682 /// derived type, change all users to use a concrete constant of the new type.
684 void ConstantStruct::refineAbstractType(const DerivedType *OldTy,
686 if (OldTy == NewTy) return;
688 // Make everyone now use a constant of the new type...
689 std::vector<Constant*> C;
690 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
691 C.push_back(cast<Constant>(getOperand(i)));
692 Constant *New = ConstantStruct::get(cast<StructType>(NewTy), C);
694 uncheckedReplaceAllUsesWith(New);
695 destroyConstant(); // This constant is now dead, destroy it.
700 //---- ConstantPointerNull::get() implementation...
703 // ConstantPointerNull does not take extra "value" argument...
704 template<class ValType>
705 struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
706 static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
707 return new ConstantPointerNull(Ty);
711 static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
713 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
714 return NullPtrConstants.getOrCreate(Ty, 0);
717 // destroyConstant - Remove the constant from the constant table...
719 void ConstantPointerNull::destroyConstant() {
720 NullPtrConstants.remove(this);
721 destroyConstantImpl();
725 /// refineAbstractType - If this callback is invoked, then this constant is of a
726 /// derived type, change all users to use a concrete constant of the new type.
728 void ConstantPointerNull::refineAbstractType(const DerivedType *OldTy,
730 if (OldTy == NewTy) return;
732 // Make everyone now use a constant of the new type...
733 Constant *New = ConstantPointerNull::get(cast<PointerType>(NewTy));
735 uncheckedReplaceAllUsesWith(New);
737 // This constant is now dead, destroy it.
745 //---- ConstantPointerRef::get() implementation...
747 ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) {
748 assert(GV->getParent() && "Global Value must be attached to a module!");
750 // The Module handles the pointer reference sharing...
751 return GV->getParent()->getConstantPointerRef(GV);
754 // destroyConstant - Remove the constant from the constant table...
756 void ConstantPointerRef::destroyConstant() {
757 getValue()->getParent()->destroyConstantPointerRef(this);
758 destroyConstantImpl();
762 //---- ConstantExpr::get() implementations...
764 typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;
767 struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
768 static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) {
769 if (V.first == Instruction::Cast)
770 return new ConstantExpr(Instruction::Cast, V.second[0], Ty);
771 if ((V.first >= Instruction::BinaryOpsBegin &&
772 V.first < Instruction::BinaryOpsEnd) ||
773 V.first == Instruction::Shl || V.first == Instruction::Shr)
774 return new ConstantExpr(V.first, V.second[0], V.second[1]);
776 assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!");
778 // Check that the indices list is valid...
779 std::vector<Value*> ValIdxList(V.second.begin()+1, V.second.end());
780 const Type *DestTy = GetElementPtrInst::getIndexedType(Ty, ValIdxList,
782 assert(DestTy && "Invalid index list for GetElementPtr expression");
784 std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
785 return new ConstantExpr(V.second[0], IdxList, PointerType::get(DestTy));
789 static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants;
791 Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) {
792 if (Constant *FC = ConstantFoldCastInstruction(C, Ty))
793 return FC; // Fold a few common cases...
795 // Look up the constant in the table first to ensure uniqueness
796 std::vector<Constant*> argVec(1, C);
797 ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec);
798 return ExprConstants.getOrCreate(Ty, Key);
801 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
802 // Check the operands for consistency first
803 assert((Opcode >= Instruction::BinaryOpsBegin &&
804 Opcode < Instruction::BinaryOpsEnd) &&
805 "Invalid opcode in binary constant expression");
806 assert(C1->getType() == C2->getType() &&
807 "Operand types in binary constant expression should match");
809 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
810 return FC; // Fold a few common cases...
812 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
813 ExprMapKeyType Key = std::make_pair(Opcode, argVec);
814 return ExprConstants.getOrCreate(C1->getType(), Key);
817 /// getShift - Return a shift left or shift right constant expr
818 Constant *ConstantExpr::getShift(unsigned Opcode, Constant *C1, Constant *C2) {
819 // Check the operands for consistency first
820 assert((Opcode == Instruction::Shl ||
821 Opcode == Instruction::Shr) &&
822 "Invalid opcode in binary constant expression");
823 assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy &&
824 "Invalid operand types for Shift constant expr!");
826 if (Constant *FC = ConstantFoldShiftInstruction(Opcode, C1, C2))
827 return FC; // Fold a few common cases...
829 // Look up the constant in the table first to ensure uniqueness
830 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
831 ExprMapKeyType Key = std::make_pair(Opcode, argVec);
832 return ExprConstants.getOrCreate(C1->getType(), Key);
836 Constant *ConstantExpr::getGetElementPtr(Constant *C,
837 const std::vector<Constant*> &IdxList){
838 if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
839 return FC; // Fold a few common cases...
840 const Type *Ty = C->getType();
841 assert(isa<PointerType>(Ty) &&
842 "Non-pointer type for constant GetElementPtr expression");
844 // Look up the constant in the table first to ensure uniqueness
845 std::vector<Constant*> argVec(1, C);
846 argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
848 const ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,argVec);
849 return ExprConstants.getOrCreate(Ty, Key);
852 // destroyConstant - Remove the constant from the constant table...
854 void ConstantExpr::destroyConstant() {
855 ExprConstants.remove(this);
856 destroyConstantImpl();
860 /// refineAbstractType - If this callback is invoked, then this constant is of a
861 /// derived type, change all users to use a concrete constant of the new type.
863 void ConstantExpr::refineAbstractType(const DerivedType *OldTy,
865 if (OldTy == NewTy) return;
867 // FIXME: These need to use a lower-level implementation method, because the
868 // ::get methods intuit the type of the result based on the types of the
869 // operands. The operand types may not have had their types resolved yet.
872 if (getOpcode() == Instruction::Cast) {
873 New = getCast(getOperand(0), NewTy);
874 } else if (getOpcode() >= Instruction::BinaryOpsBegin &&
875 getOpcode() < Instruction::BinaryOpsEnd) {
876 New = get(getOpcode(), getOperand(0), getOperand(0));
877 } else if (getOpcode() == Instruction::Shl || getOpcode() ==Instruction::Shr){
878 New = getShift(getOpcode(), getOperand(0), getOperand(0));
880 assert(getOpcode() == Instruction::GetElementPtr);
882 // Make everyone now use a constant of the new type...
883 std::vector<Constant*> C;
884 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
885 C.push_back(cast<Constant>(getOperand(i)));
886 New = ConstantExpr::getGetElementPtr(getOperand(0), C);
889 uncheckedReplaceAllUsesWith(New);
890 destroyConstant(); // This constant is now dead, destroy it.
898 const char *ConstantExpr::getOpcodeName() const {
899 return Instruction::getOpcodeName(getOpcode());
902 unsigned Constant::mutateReferences(Value *OldV, Value *NewV) {
903 // Uses of constant pointer refs are global values, not constants!
904 if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(this)) {
905 GlobalValue *NewGV = cast<GlobalValue>(NewV);
906 GlobalValue *OldGV = CPR->getValue();
908 assert(OldGV == OldV && "Cannot mutate old value if I'm not using it!");
910 OldGV->getParent()->mutateConstantPointerRef(OldGV, NewGV);
913 Constant *NewC = cast<Constant>(NewV);
914 unsigned NumReplaced = 0;
915 for (unsigned i = 0, N = getNumOperands(); i != N; ++i)
916 if (Operands[i] == OldV) {