1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes...
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "LLVMContextImpl.h"
16 #include "ConstantFold.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/GlobalValue.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/Operator.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/System/Mutex.h"
33 #include "llvm/System/RWMutex.h"
34 #include "llvm/System/Threading.h"
35 #include "llvm/ADT/DenseMap.h"
36 #include "llvm/ADT/SmallVector.h"
41 //===----------------------------------------------------------------------===//
43 //===----------------------------------------------------------------------===//
45 // Constructor to create a '0' constant of arbitrary type...
46 static const uint64_t zero[2] = {0, 0};
47 Constant* Constant::getNullValue(const Type* Ty) {
48 switch (Ty->getTypeID()) {
49 case Type::IntegerTyID:
50 return ConstantInt::get(Ty, 0);
52 return ConstantFP::get(Ty->getContext(), APFloat(APInt(32, 0)));
53 case Type::DoubleTyID:
54 return ConstantFP::get(Ty->getContext(), APFloat(APInt(64, 0)));
55 case Type::X86_FP80TyID:
56 return ConstantFP::get(Ty->getContext(), APFloat(APInt(80, 2, zero)));
58 return ConstantFP::get(Ty->getContext(),
59 APFloat(APInt(128, 2, zero), true));
60 case Type::PPC_FP128TyID:
61 return ConstantFP::get(Ty->getContext(), APFloat(APInt(128, 2, zero)));
62 case Type::PointerTyID:
63 return ConstantPointerNull::get(cast<PointerType>(Ty));
64 case Type::StructTyID:
66 case Type::VectorTyID:
67 return ConstantAggregateZero::get(Ty);
69 // Function, Label, or Opaque type?
70 assert(!"Cannot create a null constant of that type!");
75 Constant* Constant::getIntegerValue(const Type* Ty, const APInt &V) {
76 const Type *ScalarTy = Ty->getScalarType();
78 // Create the base integer constant.
79 Constant *C = ConstantInt::get(Ty->getContext(), V);
81 // Convert an integer to a pointer, if necessary.
82 if (const PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
83 C = ConstantExpr::getIntToPtr(C, PTy);
85 // Broadcast a scalar to a vector, if necessary.
86 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
87 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
92 Constant* Constant::getAllOnesValue(const Type* Ty) {
93 if (const IntegerType* ITy = dyn_cast<IntegerType>(Ty))
94 return ConstantInt::get(Ty->getContext(),
95 APInt::getAllOnesValue(ITy->getBitWidth()));
97 std::vector<Constant*> Elts;
98 const VectorType* VTy = cast<VectorType>(Ty);
99 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
100 assert(Elts[0] && "Not a vector integer type!");
101 return cast<ConstantVector>(ConstantVector::get(Elts));
104 void Constant::destroyConstantImpl() {
105 // When a Constant is destroyed, there may be lingering
106 // references to the constant by other constants in the constant pool. These
107 // constants are implicitly dependent on the module that is being deleted,
108 // but they don't know that. Because we only find out when the CPV is
109 // deleted, we must now notify all of our users (that should only be
110 // Constants) that they are, in fact, invalid now and should be deleted.
112 while (!use_empty()) {
113 Value *V = use_back();
114 #ifndef NDEBUG // Only in -g mode...
115 if (!isa<Constant>(V)) {
116 errs() << "While deleting: " << *this
117 << "\n\nUse still stuck around after Def is destroyed: "
121 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
122 Constant *CV = cast<Constant>(V);
123 CV->destroyConstant();
125 // The constant should remove itself from our use list...
126 assert((use_empty() || use_back() != V) && "Constant not removed!");
129 // Value has no outstanding references it is safe to delete it now...
133 /// canTrap - Return true if evaluation of this constant could trap. This is
134 /// true for things like constant expressions that could divide by zero.
135 bool Constant::canTrap() const {
136 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
137 // The only thing that could possibly trap are constant exprs.
138 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
139 if (!CE) return false;
141 // ConstantExpr traps if any operands can trap.
142 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
143 if (getOperand(i)->canTrap())
146 // Otherwise, only specific operations can trap.
147 switch (CE->getOpcode()) {
150 case Instruction::UDiv:
151 case Instruction::SDiv:
152 case Instruction::FDiv:
153 case Instruction::URem:
154 case Instruction::SRem:
155 case Instruction::FRem:
156 // Div and rem can trap if the RHS is not known to be non-zero.
157 if (!isa<ConstantInt>(getOperand(1)) || getOperand(1)->isNullValue())
164 /// getRelocationInfo - This method classifies the entry according to
165 /// whether or not it may generate a relocation entry. This must be
166 /// conservative, so if it might codegen to a relocatable entry, it should say
167 /// so. The return values are:
169 /// NoRelocation: This constant pool entry is guaranteed to never have a
170 /// relocation applied to it (because it holds a simple constant like
172 /// LocalRelocation: This entry has relocations, but the entries are
173 /// guaranteed to be resolvable by the static linker, so the dynamic
174 /// linker will never see them.
175 /// GlobalRelocations: This entry may have arbitrary relocations.
177 /// FIXME: This really should not be in VMCore.
178 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
179 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
180 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
181 return LocalRelocation; // Local to this file/library.
182 return GlobalRelocations; // Global reference.
185 PossibleRelocationsTy Result = NoRelocation;
186 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
187 Result = std::max(Result, getOperand(i)->getRelocationInfo());
193 /// getVectorElements - This method, which is only valid on constant of vector
194 /// type, returns the elements of the vector in the specified smallvector.
195 /// This handles breaking down a vector undef into undef elements, etc. For
196 /// constant exprs and other cases we can't handle, we return an empty vector.
197 void Constant::getVectorElements(LLVMContext &Context,
198 SmallVectorImpl<Constant*> &Elts) const {
199 assert(isa<VectorType>(getType()) && "Not a vector constant!");
201 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
202 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
203 Elts.push_back(CV->getOperand(i));
207 const VectorType *VT = cast<VectorType>(getType());
208 if (isa<ConstantAggregateZero>(this)) {
209 Elts.assign(VT->getNumElements(),
210 Constant::getNullValue(VT->getElementType()));
214 if (isa<UndefValue>(this)) {
215 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
219 // Unknown type, must be constant expr etc.
224 //===----------------------------------------------------------------------===//
226 //===----------------------------------------------------------------------===//
228 ConstantInt::ConstantInt(const IntegerType *Ty, const APInt& V)
229 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
230 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
233 ConstantInt* ConstantInt::getTrue(LLVMContext &Context) {
234 LLVMContextImpl *pImpl = Context.pImpl;
235 if (pImpl->TheTrueVal)
236 return pImpl->TheTrueVal;
238 return (pImpl->TheTrueVal =
239 ConstantInt::get(IntegerType::get(Context, 1), 1));
242 ConstantInt* ConstantInt::getFalse(LLVMContext &Context) {
243 LLVMContextImpl *pImpl = Context.pImpl;
244 if (pImpl->TheFalseVal)
245 return pImpl->TheFalseVal;
247 return (pImpl->TheFalseVal =
248 ConstantInt::get(IntegerType::get(Context, 1), 0));
252 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
253 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
254 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
255 // compare APInt's of different widths, which would violate an APInt class
256 // invariant which generates an assertion.
257 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt& V) {
258 // Get the corresponding integer type for the bit width of the value.
259 const IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
260 // get an existing value or the insertion position
261 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
262 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
263 if (!Slot) Slot = new ConstantInt(ITy, V);
267 Constant* ConstantInt::get(const Type* Ty, uint64_t V, bool isSigned) {
268 Constant *C = get(cast<IntegerType>(Ty->getScalarType()),
271 // For vectors, broadcast the value.
272 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
273 return ConstantVector::get(
274 std::vector<Constant *>(VTy->getNumElements(), C));
279 ConstantInt* ConstantInt::get(const IntegerType* Ty, uint64_t V,
281 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
284 ConstantInt* ConstantInt::getSigned(const IntegerType* Ty, int64_t V) {
285 return get(Ty, V, true);
288 Constant *ConstantInt::getSigned(const Type *Ty, int64_t V) {
289 return get(Ty, V, true);
292 Constant* ConstantInt::get(const Type* Ty, const APInt& V) {
293 ConstantInt *C = get(Ty->getContext(), V);
294 assert(C->getType() == Ty->getScalarType() &&
295 "ConstantInt type doesn't match the type implied by its value!");
297 // For vectors, broadcast the value.
298 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
299 return ConstantVector::get(
300 std::vector<Constant *>(VTy->getNumElements(), C));
305 ConstantInt* ConstantInt::get(const IntegerType* Ty, const StringRef& Str,
307 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
310 //===----------------------------------------------------------------------===//
312 //===----------------------------------------------------------------------===//
314 static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
316 return &APFloat::IEEEsingle;
317 if (Ty->isDoubleTy())
318 return &APFloat::IEEEdouble;
319 if (Ty->isX86_FP80Ty())
320 return &APFloat::x87DoubleExtended;
321 else if (Ty->isFP128Ty())
322 return &APFloat::IEEEquad;
324 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
325 return &APFloat::PPCDoubleDouble;
328 /// get() - This returns a constant fp for the specified value in the
329 /// specified type. This should only be used for simple constant values like
330 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
331 Constant* ConstantFP::get(const Type* Ty, double V) {
332 LLVMContext &Context = Ty->getContext();
336 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
337 APFloat::rmNearestTiesToEven, &ignored);
338 Constant *C = get(Context, FV);
340 // For vectors, broadcast the value.
341 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
342 return ConstantVector::get(
343 std::vector<Constant *>(VTy->getNumElements(), C));
349 Constant* ConstantFP::get(const Type* Ty, const StringRef& Str) {
350 LLVMContext &Context = Ty->getContext();
352 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
353 Constant *C = get(Context, FV);
355 // For vectors, broadcast the value.
356 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
357 return ConstantVector::get(
358 std::vector<Constant *>(VTy->getNumElements(), C));
364 ConstantFP* ConstantFP::getNegativeZero(const Type* Ty) {
365 LLVMContext &Context = Ty->getContext();
366 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
368 return get(Context, apf);
372 Constant* ConstantFP::getZeroValueForNegation(const Type* Ty) {
373 if (const VectorType *PTy = dyn_cast<VectorType>(Ty))
374 if (PTy->getElementType()->isFloatingPoint()) {
375 std::vector<Constant*> zeros(PTy->getNumElements(),
376 getNegativeZero(PTy->getElementType()));
377 return ConstantVector::get(PTy, zeros);
380 if (Ty->isFloatingPoint())
381 return getNegativeZero(Ty);
383 return Constant::getNullValue(Ty);
387 // ConstantFP accessors.
388 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
389 DenseMapAPFloatKeyInfo::KeyTy Key(V);
391 LLVMContextImpl* pImpl = Context.pImpl;
393 ConstantFP *&Slot = pImpl->FPConstants[Key];
397 if (&V.getSemantics() == &APFloat::IEEEsingle)
398 Ty = Type::getFloatTy(Context);
399 else if (&V.getSemantics() == &APFloat::IEEEdouble)
400 Ty = Type::getDoubleTy(Context);
401 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
402 Ty = Type::getX86_FP80Ty(Context);
403 else if (&V.getSemantics() == &APFloat::IEEEquad)
404 Ty = Type::getFP128Ty(Context);
406 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
407 "Unknown FP format");
408 Ty = Type::getPPC_FP128Ty(Context);
410 Slot = new ConstantFP(Ty, V);
416 ConstantFP *ConstantFP::getInfinity(const Type *Ty, bool Negative) {
417 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
418 return ConstantFP::get(Ty->getContext(),
419 APFloat::getInf(Semantics, Negative));
422 ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
423 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
424 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
428 bool ConstantFP::isNullValue() const {
429 return Val.isZero() && !Val.isNegative();
432 bool ConstantFP::isExactlyValue(const APFloat& V) const {
433 return Val.bitwiseIsEqual(V);
436 //===----------------------------------------------------------------------===//
437 // ConstantXXX Classes
438 //===----------------------------------------------------------------------===//
441 ConstantArray::ConstantArray(const ArrayType *T,
442 const std::vector<Constant*> &V)
443 : Constant(T, ConstantArrayVal,
444 OperandTraits<ConstantArray>::op_end(this) - V.size(),
446 assert(V.size() == T->getNumElements() &&
447 "Invalid initializer vector for constant array");
448 Use *OL = OperandList;
449 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
452 assert(C->getType() == T->getElementType() &&
453 "Initializer for array element doesn't match array element type!");
458 Constant *ConstantArray::get(const ArrayType *Ty,
459 const std::vector<Constant*> &V) {
460 for (unsigned i = 0, e = V.size(); i != e; ++i) {
461 assert(V[i]->getType() == Ty->getElementType() &&
462 "Wrong type in array element initializer");
464 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
465 // If this is an all-zero array, return a ConstantAggregateZero object
468 if (!C->isNullValue()) {
469 // Implicitly locked.
470 return pImpl->ArrayConstants.getOrCreate(Ty, V);
472 for (unsigned i = 1, e = V.size(); i != e; ++i)
474 // Implicitly locked.
475 return pImpl->ArrayConstants.getOrCreate(Ty, V);
479 return ConstantAggregateZero::get(Ty);
483 Constant* ConstantArray::get(const ArrayType* T, Constant* const* Vals,
485 // FIXME: make this the primary ctor method.
486 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
489 /// ConstantArray::get(const string&) - Return an array that is initialized to
490 /// contain the specified string. If length is zero then a null terminator is
491 /// added to the specified string so that it may be used in a natural way.
492 /// Otherwise, the length parameter specifies how much of the string to use
493 /// and it won't be null terminated.
495 Constant* ConstantArray::get(LLVMContext &Context, const StringRef &Str,
497 std::vector<Constant*> ElementVals;
498 for (unsigned i = 0; i < Str.size(); ++i)
499 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
501 // Add a null terminator to the string...
503 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
506 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
507 return get(ATy, ElementVals);
512 ConstantStruct::ConstantStruct(const StructType *T,
513 const std::vector<Constant*> &V)
514 : Constant(T, ConstantStructVal,
515 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
517 assert(V.size() == T->getNumElements() &&
518 "Invalid initializer vector for constant structure");
519 Use *OL = OperandList;
520 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
523 assert(C->getType() == T->getElementType(I-V.begin()) &&
524 "Initializer for struct element doesn't match struct element type!");
529 // ConstantStruct accessors.
530 Constant* ConstantStruct::get(const StructType* T,
531 const std::vector<Constant*>& V) {
532 LLVMContextImpl* pImpl = T->getContext().pImpl;
534 // Create a ConstantAggregateZero value if all elements are zeros...
535 for (unsigned i = 0, e = V.size(); i != e; ++i)
536 if (!V[i]->isNullValue())
537 // Implicitly locked.
538 return pImpl->StructConstants.getOrCreate(T, V);
540 return ConstantAggregateZero::get(T);
543 Constant* ConstantStruct::get(LLVMContext &Context,
544 const std::vector<Constant*>& V, bool packed) {
545 std::vector<const Type*> StructEls;
546 StructEls.reserve(V.size());
547 for (unsigned i = 0, e = V.size(); i != e; ++i)
548 StructEls.push_back(V[i]->getType());
549 return get(StructType::get(Context, StructEls, packed), V);
552 Constant* ConstantStruct::get(LLVMContext &Context,
553 Constant* const *Vals, unsigned NumVals,
555 // FIXME: make this the primary ctor method.
556 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
559 ConstantVector::ConstantVector(const VectorType *T,
560 const std::vector<Constant*> &V)
561 : Constant(T, ConstantVectorVal,
562 OperandTraits<ConstantVector>::op_end(this) - V.size(),
564 Use *OL = OperandList;
565 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
568 assert(C->getType() == T->getElementType() &&
569 "Initializer for vector element doesn't match vector element type!");
574 // ConstantVector accessors.
575 Constant* ConstantVector::get(const VectorType* T,
576 const std::vector<Constant*>& V) {
577 assert(!V.empty() && "Vectors can't be empty");
578 LLVMContext &Context = T->getContext();
579 LLVMContextImpl *pImpl = Context.pImpl;
581 // If this is an all-undef or alll-zero vector, return a
582 // ConstantAggregateZero or UndefValue.
584 bool isZero = C->isNullValue();
585 bool isUndef = isa<UndefValue>(C);
587 if (isZero || isUndef) {
588 for (unsigned i = 1, e = V.size(); i != e; ++i)
590 isZero = isUndef = false;
596 return ConstantAggregateZero::get(T);
598 return UndefValue::get(T);
600 // Implicitly locked.
601 return pImpl->VectorConstants.getOrCreate(T, V);
604 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
605 assert(!V.empty() && "Cannot infer type if V is empty");
606 return get(VectorType::get(V.front()->getType(),V.size()), V);
609 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
610 // FIXME: make this the primary ctor method.
611 return get(std::vector<Constant*>(Vals, Vals+NumVals));
614 Constant* ConstantExpr::getNSWAdd(Constant* C1, Constant* C2) {
615 return getTy(C1->getType(), Instruction::Add, C1, C2,
616 OverflowingBinaryOperator::NoSignedWrap);
619 Constant* ConstantExpr::getNSWSub(Constant* C1, Constant* C2) {
620 return getTy(C1->getType(), Instruction::Sub, C1, C2,
621 OverflowingBinaryOperator::NoSignedWrap);
624 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
625 return getTy(C1->getType(), Instruction::SDiv, C1, C2,
626 SDivOperator::IsExact);
629 // Utility function for determining if a ConstantExpr is a CastOp or not. This
630 // can't be inline because we don't want to #include Instruction.h into
632 bool ConstantExpr::isCast() const {
633 return Instruction::isCast(getOpcode());
636 bool ConstantExpr::isCompare() const {
637 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
640 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
641 if (getOpcode() != Instruction::GetElementPtr) return false;
643 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
644 User::const_op_iterator OI = next(this->op_begin());
646 // Skip the first index, as it has no static limit.
650 // The remaining indices must be compile-time known integers within the
651 // bounds of the corresponding notional static array types.
652 for (; GEPI != E; ++GEPI, ++OI) {
653 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
654 if (!CI) return false;
655 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
656 if (CI->getValue().getActiveBits() > 64 ||
657 CI->getZExtValue() >= ATy->getNumElements())
661 // All the indices checked out.
665 bool ConstantExpr::hasIndices() const {
666 return getOpcode() == Instruction::ExtractValue ||
667 getOpcode() == Instruction::InsertValue;
670 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
671 if (const ExtractValueConstantExpr *EVCE =
672 dyn_cast<ExtractValueConstantExpr>(this))
673 return EVCE->Indices;
675 return cast<InsertValueConstantExpr>(this)->Indices;
678 unsigned ConstantExpr::getPredicate() const {
679 assert(getOpcode() == Instruction::FCmp ||
680 getOpcode() == Instruction::ICmp);
681 return ((const CompareConstantExpr*)this)->predicate;
684 /// getWithOperandReplaced - Return a constant expression identical to this
685 /// one, but with the specified operand set to the specified value.
687 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
688 assert(OpNo < getNumOperands() && "Operand num is out of range!");
689 assert(Op->getType() == getOperand(OpNo)->getType() &&
690 "Replacing operand with value of different type!");
691 if (getOperand(OpNo) == Op)
692 return const_cast<ConstantExpr*>(this);
694 Constant *Op0, *Op1, *Op2;
695 switch (getOpcode()) {
696 case Instruction::Trunc:
697 case Instruction::ZExt:
698 case Instruction::SExt:
699 case Instruction::FPTrunc:
700 case Instruction::FPExt:
701 case Instruction::UIToFP:
702 case Instruction::SIToFP:
703 case Instruction::FPToUI:
704 case Instruction::FPToSI:
705 case Instruction::PtrToInt:
706 case Instruction::IntToPtr:
707 case Instruction::BitCast:
708 return ConstantExpr::getCast(getOpcode(), Op, getType());
709 case Instruction::Select:
710 Op0 = (OpNo == 0) ? Op : getOperand(0);
711 Op1 = (OpNo == 1) ? Op : getOperand(1);
712 Op2 = (OpNo == 2) ? Op : getOperand(2);
713 return ConstantExpr::getSelect(Op0, Op1, Op2);
714 case Instruction::InsertElement:
715 Op0 = (OpNo == 0) ? Op : getOperand(0);
716 Op1 = (OpNo == 1) ? Op : getOperand(1);
717 Op2 = (OpNo == 2) ? Op : getOperand(2);
718 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
719 case Instruction::ExtractElement:
720 Op0 = (OpNo == 0) ? Op : getOperand(0);
721 Op1 = (OpNo == 1) ? Op : getOperand(1);
722 return ConstantExpr::getExtractElement(Op0, Op1);
723 case Instruction::ShuffleVector:
724 Op0 = (OpNo == 0) ? Op : getOperand(0);
725 Op1 = (OpNo == 1) ? Op : getOperand(1);
726 Op2 = (OpNo == 2) ? Op : getOperand(2);
727 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
728 case Instruction::GetElementPtr: {
729 SmallVector<Constant*, 8> Ops;
730 Ops.resize(getNumOperands()-1);
731 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
732 Ops[i-1] = getOperand(i);
734 return cast<GEPOperator>(this)->isInBounds() ?
735 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
736 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
738 return cast<GEPOperator>(this)->isInBounds() ?
739 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0], Ops.size()) :
740 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
743 assert(getNumOperands() == 2 && "Must be binary operator?");
744 Op0 = (OpNo == 0) ? Op : getOperand(0);
745 Op1 = (OpNo == 1) ? Op : getOperand(1);
746 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassData);
750 /// getWithOperands - This returns the current constant expression with the
751 /// operands replaced with the specified values. The specified operands must
752 /// match count and type with the existing ones.
753 Constant *ConstantExpr::
754 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
755 assert(NumOps == getNumOperands() && "Operand count mismatch!");
756 bool AnyChange = false;
757 for (unsigned i = 0; i != NumOps; ++i) {
758 assert(Ops[i]->getType() == getOperand(i)->getType() &&
759 "Operand type mismatch!");
760 AnyChange |= Ops[i] != getOperand(i);
762 if (!AnyChange) // No operands changed, return self.
763 return const_cast<ConstantExpr*>(this);
765 switch (getOpcode()) {
766 case Instruction::Trunc:
767 case Instruction::ZExt:
768 case Instruction::SExt:
769 case Instruction::FPTrunc:
770 case Instruction::FPExt:
771 case Instruction::UIToFP:
772 case Instruction::SIToFP:
773 case Instruction::FPToUI:
774 case Instruction::FPToSI:
775 case Instruction::PtrToInt:
776 case Instruction::IntToPtr:
777 case Instruction::BitCast:
778 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
779 case Instruction::Select:
780 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
781 case Instruction::InsertElement:
782 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
783 case Instruction::ExtractElement:
784 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
785 case Instruction::ShuffleVector:
786 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
787 case Instruction::GetElementPtr:
788 return cast<GEPOperator>(this)->isInBounds() ?
789 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], NumOps-1) :
790 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
791 case Instruction::ICmp:
792 case Instruction::FCmp:
793 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
795 assert(getNumOperands() == 2 && "Must be binary operator?");
796 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassData);
801 //===----------------------------------------------------------------------===//
802 // isValueValidForType implementations
804 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
805 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
806 if (Ty == Type::getInt1Ty(Ty->getContext()))
807 return Val == 0 || Val == 1;
809 return true; // always true, has to fit in largest type
810 uint64_t Max = (1ll << NumBits) - 1;
814 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
815 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
816 if (Ty == Type::getInt1Ty(Ty->getContext()))
817 return Val == 0 || Val == 1 || Val == -1;
819 return true; // always true, has to fit in largest type
820 int64_t Min = -(1ll << (NumBits-1));
821 int64_t Max = (1ll << (NumBits-1)) - 1;
822 return (Val >= Min && Val <= Max);
825 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
826 // convert modifies in place, so make a copy.
827 APFloat Val2 = APFloat(Val);
829 switch (Ty->getTypeID()) {
831 return false; // These can't be represented as floating point!
833 // FIXME rounding mode needs to be more flexible
834 case Type::FloatTyID: {
835 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
837 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
840 case Type::DoubleTyID: {
841 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
842 &Val2.getSemantics() == &APFloat::IEEEdouble)
844 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
847 case Type::X86_FP80TyID:
848 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
849 &Val2.getSemantics() == &APFloat::IEEEdouble ||
850 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
851 case Type::FP128TyID:
852 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
853 &Val2.getSemantics() == &APFloat::IEEEdouble ||
854 &Val2.getSemantics() == &APFloat::IEEEquad;
855 case Type::PPC_FP128TyID:
856 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
857 &Val2.getSemantics() == &APFloat::IEEEdouble ||
858 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
862 //===----------------------------------------------------------------------===//
863 // Factory Function Implementation
865 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
866 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
867 "Cannot create an aggregate zero of non-aggregate type!");
869 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
870 // Implicitly locked.
871 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
874 /// destroyConstant - Remove the constant from the constant table...
876 void ConstantAggregateZero::destroyConstant() {
877 // Implicitly locked.
878 getType()->getContext().pImpl->AggZeroConstants.remove(this);
879 destroyConstantImpl();
882 /// destroyConstant - Remove the constant from the constant table...
884 void ConstantArray::destroyConstant() {
885 // Implicitly locked.
886 getType()->getContext().pImpl->ArrayConstants.remove(this);
887 destroyConstantImpl();
890 /// isString - This method returns true if the array is an array of i8, and
891 /// if the elements of the array are all ConstantInt's.
892 bool ConstantArray::isString() const {
893 // Check the element type for i8...
894 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
896 // Check the elements to make sure they are all integers, not constant
898 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
899 if (!isa<ConstantInt>(getOperand(i)))
904 /// isCString - This method returns true if the array is a string (see
905 /// isString) and it ends in a null byte \\0 and does not contains any other
906 /// null bytes except its terminator.
907 bool ConstantArray::isCString() const {
908 // Check the element type for i8...
909 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
912 // Last element must be a null.
913 if (!getOperand(getNumOperands()-1)->isNullValue())
915 // Other elements must be non-null integers.
916 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
917 if (!isa<ConstantInt>(getOperand(i)))
919 if (getOperand(i)->isNullValue())
926 /// getAsString - If the sub-element type of this array is i8
927 /// then this method converts the array to an std::string and returns it.
928 /// Otherwise, it asserts out.
930 std::string ConstantArray::getAsString() const {
931 assert(isString() && "Not a string!");
933 Result.reserve(getNumOperands());
934 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
935 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
940 //---- ConstantStruct::get() implementation...
947 // destroyConstant - Remove the constant from the constant table...
949 void ConstantStruct::destroyConstant() {
950 // Implicitly locked.
951 getType()->getContext().pImpl->StructConstants.remove(this);
952 destroyConstantImpl();
955 // destroyConstant - Remove the constant from the constant table...
957 void ConstantVector::destroyConstant() {
958 // Implicitly locked.
959 getType()->getContext().pImpl->VectorConstants.remove(this);
960 destroyConstantImpl();
963 /// This function will return true iff every element in this vector constant
964 /// is set to all ones.
965 /// @returns true iff this constant's emements are all set to all ones.
966 /// @brief Determine if the value is all ones.
967 bool ConstantVector::isAllOnesValue() const {
968 // Check out first element.
969 const Constant *Elt = getOperand(0);
970 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
971 if (!CI || !CI->isAllOnesValue()) return false;
972 // Then make sure all remaining elements point to the same value.
973 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
974 if (getOperand(I) != Elt) return false;
979 /// getSplatValue - If this is a splat constant, where all of the
980 /// elements have the same value, return that value. Otherwise return null.
981 Constant *ConstantVector::getSplatValue() {
982 // Check out first element.
983 Constant *Elt = getOperand(0);
984 // Then make sure all remaining elements point to the same value.
985 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
986 if (getOperand(I) != Elt) return 0;
990 //---- ConstantPointerNull::get() implementation...
993 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
994 // Implicitly locked.
995 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
998 // destroyConstant - Remove the constant from the constant table...
1000 void ConstantPointerNull::destroyConstant() {
1001 // Implicitly locked.
1002 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1003 destroyConstantImpl();
1007 //---- UndefValue::get() implementation...
1010 UndefValue *UndefValue::get(const Type *Ty) {
1011 // Implicitly locked.
1012 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1015 // destroyConstant - Remove the constant from the constant table.
1017 void UndefValue::destroyConstant() {
1018 // Implicitly locked.
1019 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1020 destroyConstantImpl();
1023 //---- ConstantExpr::get() implementations...
1026 /// This is a utility function to handle folding of casts and lookup of the
1027 /// cast in the ExprConstants map. It is used by the various get* methods below.
1028 static inline Constant *getFoldedCast(
1029 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1030 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1031 // Fold a few common cases
1032 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1035 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1037 // Look up the constant in the table first to ensure uniqueness
1038 std::vector<Constant*> argVec(1, C);
1039 ExprMapKeyType Key(opc, argVec);
1041 // Implicitly locked.
1042 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1045 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1046 Instruction::CastOps opc = Instruction::CastOps(oc);
1047 assert(Instruction::isCast(opc) && "opcode out of range");
1048 assert(C && Ty && "Null arguments to getCast");
1049 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1053 llvm_unreachable("Invalid cast opcode");
1055 case Instruction::Trunc: return getTrunc(C, Ty);
1056 case Instruction::ZExt: return getZExt(C, Ty);
1057 case Instruction::SExt: return getSExt(C, Ty);
1058 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1059 case Instruction::FPExt: return getFPExtend(C, Ty);
1060 case Instruction::UIToFP: return getUIToFP(C, Ty);
1061 case Instruction::SIToFP: return getSIToFP(C, Ty);
1062 case Instruction::FPToUI: return getFPToUI(C, Ty);
1063 case Instruction::FPToSI: return getFPToSI(C, Ty);
1064 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1065 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1066 case Instruction::BitCast: return getBitCast(C, Ty);
1071 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1072 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1073 return getCast(Instruction::BitCast, C, Ty);
1074 return getCast(Instruction::ZExt, C, Ty);
1077 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1078 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1079 return getCast(Instruction::BitCast, C, Ty);
1080 return getCast(Instruction::SExt, C, Ty);
1083 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1084 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1085 return getCast(Instruction::BitCast, C, Ty);
1086 return getCast(Instruction::Trunc, C, Ty);
1089 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1090 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1091 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1093 if (Ty->isInteger())
1094 return getCast(Instruction::PtrToInt, S, Ty);
1095 return getCast(Instruction::BitCast, S, Ty);
1098 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1100 assert(C->getType()->isIntOrIntVector() &&
1101 Ty->isIntOrIntVector() && "Invalid cast");
1102 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1103 unsigned DstBits = Ty->getScalarSizeInBits();
1104 Instruction::CastOps opcode =
1105 (SrcBits == DstBits ? Instruction::BitCast :
1106 (SrcBits > DstBits ? Instruction::Trunc :
1107 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1108 return getCast(opcode, C, Ty);
1111 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1112 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1114 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1115 unsigned DstBits = Ty->getScalarSizeInBits();
1116 if (SrcBits == DstBits)
1117 return C; // Avoid a useless cast
1118 Instruction::CastOps opcode =
1119 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1120 return getCast(opcode, C, Ty);
1123 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1125 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1126 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1128 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1129 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1130 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1131 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1132 "SrcTy must be larger than DestTy for Trunc!");
1134 return getFoldedCast(Instruction::Trunc, C, Ty);
1137 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1139 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1140 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1142 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1143 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1144 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1145 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1146 "SrcTy must be smaller than DestTy for SExt!");
1148 return getFoldedCast(Instruction::SExt, C, Ty);
1151 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1153 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1154 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1156 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1157 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1158 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1159 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1160 "SrcTy must be smaller than DestTy for ZExt!");
1162 return getFoldedCast(Instruction::ZExt, C, Ty);
1165 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1167 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1168 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1170 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1171 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1172 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1173 "This is an illegal floating point truncation!");
1174 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1177 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1179 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1180 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1182 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1183 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1184 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1185 "This is an illegal floating point extension!");
1186 return getFoldedCast(Instruction::FPExt, C, Ty);
1189 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1191 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1192 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1194 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1195 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1196 "This is an illegal uint to floating point cast!");
1197 return getFoldedCast(Instruction::UIToFP, C, Ty);
1200 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1202 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1203 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1205 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1206 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1207 "This is an illegal sint to floating point cast!");
1208 return getFoldedCast(Instruction::SIToFP, C, Ty);
1211 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1213 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1214 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1216 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1217 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1218 "This is an illegal floating point to uint cast!");
1219 return getFoldedCast(Instruction::FPToUI, C, Ty);
1222 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1224 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1225 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1227 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1228 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1229 "This is an illegal floating point to sint cast!");
1230 return getFoldedCast(Instruction::FPToSI, C, Ty);
1233 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1234 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1235 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1236 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1239 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1240 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1241 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1242 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1245 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1246 // BitCast implies a no-op cast of type only. No bits change. However, you
1247 // can't cast pointers to anything but pointers.
1249 const Type *SrcTy = C->getType();
1250 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1251 "BitCast cannot cast pointer to non-pointer and vice versa");
1253 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1254 // or nonptr->ptr). For all the other types, the cast is okay if source and
1255 // destination bit widths are identical.
1256 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1257 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1259 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1261 // It is common to ask for a bitcast of a value to its own type, handle this
1263 if (C->getType() == DstTy) return C;
1265 return getFoldedCast(Instruction::BitCast, C, DstTy);
1268 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1269 Constant *C1, Constant *C2,
1271 // Check the operands for consistency first
1272 assert(Opcode >= Instruction::BinaryOpsBegin &&
1273 Opcode < Instruction::BinaryOpsEnd &&
1274 "Invalid opcode in binary constant expression");
1275 assert(C1->getType() == C2->getType() &&
1276 "Operand types in binary constant expression should match");
1278 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1279 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1281 return FC; // Fold a few common cases...
1283 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1284 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1286 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1288 // Implicitly locked.
1289 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1292 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1293 Constant *C1, Constant *C2) {
1294 switch (predicate) {
1295 default: llvm_unreachable("Invalid CmpInst predicate");
1296 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1297 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1298 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1299 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1300 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1301 case CmpInst::FCMP_TRUE:
1302 return getFCmp(predicate, C1, C2);
1304 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1305 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1306 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1307 case CmpInst::ICMP_SLE:
1308 return getICmp(predicate, C1, C2);
1312 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1314 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1315 if (C1->getType()->isFPOrFPVector()) {
1316 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1317 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1318 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1322 case Instruction::Add:
1323 case Instruction::Sub:
1324 case Instruction::Mul:
1325 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1326 assert(C1->getType()->isIntOrIntVector() &&
1327 "Tried to create an integer operation on a non-integer type!");
1329 case Instruction::FAdd:
1330 case Instruction::FSub:
1331 case Instruction::FMul:
1332 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1333 assert(C1->getType()->isFPOrFPVector() &&
1334 "Tried to create a floating-point operation on a "
1335 "non-floating-point type!");
1337 case Instruction::UDiv:
1338 case Instruction::SDiv:
1339 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1340 assert(C1->getType()->isIntOrIntVector() &&
1341 "Tried to create an arithmetic operation on a non-arithmetic type!");
1343 case Instruction::FDiv:
1344 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1345 assert(C1->getType()->isFPOrFPVector() &&
1346 "Tried to create an arithmetic operation on a non-arithmetic type!");
1348 case Instruction::URem:
1349 case Instruction::SRem:
1350 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1351 assert(C1->getType()->isIntOrIntVector() &&
1352 "Tried to create an arithmetic operation on a non-arithmetic type!");
1354 case Instruction::FRem:
1355 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1356 assert(C1->getType()->isFPOrFPVector() &&
1357 "Tried to create an arithmetic operation on a non-arithmetic type!");
1359 case Instruction::And:
1360 case Instruction::Or:
1361 case Instruction::Xor:
1362 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1363 assert(C1->getType()->isIntOrIntVector() &&
1364 "Tried to create a logical operation on a non-integral type!");
1366 case Instruction::Shl:
1367 case Instruction::LShr:
1368 case Instruction::AShr:
1369 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1370 assert(C1->getType()->isIntOrIntVector() &&
1371 "Tried to create a shift operation on a non-integer type!");
1378 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1381 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1382 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1383 // Note that a non-inbounds gep is used, as null isn't within any object.
1384 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1385 Constant *GEP = getGetElementPtr(
1386 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1387 return getCast(Instruction::PtrToInt, GEP,
1388 Type::getInt64Ty(Ty->getContext()));
1391 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1392 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1393 // Note that a non-inbounds gep is used, as null isn't within any object.
1394 const Type *AligningTy = StructType::get(Ty->getContext(),
1395 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1396 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1397 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1398 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1399 Constant *Indices[2] = { Zero, One };
1400 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1401 return getCast(Instruction::PtrToInt, GEP,
1402 Type::getInt32Ty(Ty->getContext()));
1405 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1406 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1407 // Note that a non-inbounds gep is used, as null isn't within any object.
1408 Constant *GEPIdx[] = {
1409 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1410 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1412 Constant *GEP = getGetElementPtr(
1413 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1414 return getCast(Instruction::PtrToInt, GEP,
1415 Type::getInt64Ty(STy->getContext()));
1418 Constant *ConstantExpr::getCompare(unsigned short pred,
1419 Constant *C1, Constant *C2) {
1420 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1421 return getCompareTy(pred, C1, C2);
1424 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1425 Constant *V1, Constant *V2) {
1426 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1428 if (ReqTy == V1->getType())
1429 if (Constant *SC = ConstantFoldSelectInstruction(
1430 ReqTy->getContext(), C, V1, V2))
1431 return SC; // Fold common cases
1433 std::vector<Constant*> argVec(3, C);
1436 ExprMapKeyType Key(Instruction::Select, argVec);
1438 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1440 // Implicitly locked.
1441 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1444 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1447 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1449 cast<PointerType>(ReqTy)->getElementType() &&
1450 "GEP indices invalid!");
1452 if (Constant *FC = ConstantFoldGetElementPtr(
1453 ReqTy->getContext(), C, /*inBounds=*/false,
1454 (Constant**)Idxs, NumIdx))
1455 return FC; // Fold a few common cases...
1457 assert(isa<PointerType>(C->getType()) &&
1458 "Non-pointer type for constant GetElementPtr expression");
1459 // Look up the constant in the table first to ensure uniqueness
1460 std::vector<Constant*> ArgVec;
1461 ArgVec.reserve(NumIdx+1);
1462 ArgVec.push_back(C);
1463 for (unsigned i = 0; i != NumIdx; ++i)
1464 ArgVec.push_back(cast<Constant>(Idxs[i]));
1465 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1467 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1469 // Implicitly locked.
1470 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1473 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1477 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1479 cast<PointerType>(ReqTy)->getElementType() &&
1480 "GEP indices invalid!");
1482 if (Constant *FC = ConstantFoldGetElementPtr(
1483 ReqTy->getContext(), C, /*inBounds=*/true,
1484 (Constant**)Idxs, NumIdx))
1485 return FC; // Fold a few common cases...
1487 assert(isa<PointerType>(C->getType()) &&
1488 "Non-pointer type for constant GetElementPtr expression");
1489 // Look up the constant in the table first to ensure uniqueness
1490 std::vector<Constant*> ArgVec;
1491 ArgVec.reserve(NumIdx+1);
1492 ArgVec.push_back(C);
1493 for (unsigned i = 0; i != NumIdx; ++i)
1494 ArgVec.push_back(cast<Constant>(Idxs[i]));
1495 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1496 GEPOperator::IsInBounds);
1498 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1500 // Implicitly locked.
1501 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1504 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1506 // Get the result type of the getelementptr!
1508 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1509 assert(Ty && "GEP indices invalid!");
1510 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1511 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1514 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1517 // Get the result type of the getelementptr!
1519 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1520 assert(Ty && "GEP indices invalid!");
1521 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1522 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1525 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1527 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1530 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1531 Constant* const *Idxs,
1533 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1537 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1538 assert(LHS->getType() == RHS->getType());
1539 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1540 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1542 if (Constant *FC = ConstantFoldCompareInstruction(
1543 LHS->getContext(), pred, LHS, RHS))
1544 return FC; // Fold a few common cases...
1546 // Look up the constant in the table first to ensure uniqueness
1547 std::vector<Constant*> ArgVec;
1548 ArgVec.push_back(LHS);
1549 ArgVec.push_back(RHS);
1550 // Get the key type with both the opcode and predicate
1551 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1553 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1555 // Implicitly locked.
1557 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1561 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1562 assert(LHS->getType() == RHS->getType());
1563 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1565 if (Constant *FC = ConstantFoldCompareInstruction(
1566 LHS->getContext(), pred, LHS, RHS))
1567 return FC; // Fold a few common cases...
1569 // Look up the constant in the table first to ensure uniqueness
1570 std::vector<Constant*> ArgVec;
1571 ArgVec.push_back(LHS);
1572 ArgVec.push_back(RHS);
1573 // Get the key type with both the opcode and predicate
1574 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1576 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1578 // Implicitly locked.
1580 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1583 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1585 if (Constant *FC = ConstantFoldExtractElementInstruction(
1586 ReqTy->getContext(), Val, Idx))
1587 return FC; // Fold a few common cases...
1588 // Look up the constant in the table first to ensure uniqueness
1589 std::vector<Constant*> ArgVec(1, Val);
1590 ArgVec.push_back(Idx);
1591 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1593 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1595 // Implicitly locked.
1596 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1599 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1600 assert(isa<VectorType>(Val->getType()) &&
1601 "Tried to create extractelement operation on non-vector type!");
1602 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1603 "Extractelement index must be i32 type!");
1604 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1608 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1609 Constant *Elt, Constant *Idx) {
1610 if (Constant *FC = ConstantFoldInsertElementInstruction(
1611 ReqTy->getContext(), Val, Elt, Idx))
1612 return FC; // Fold a few common cases...
1613 // Look up the constant in the table first to ensure uniqueness
1614 std::vector<Constant*> ArgVec(1, Val);
1615 ArgVec.push_back(Elt);
1616 ArgVec.push_back(Idx);
1617 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1619 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1621 // Implicitly locked.
1622 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1625 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1627 assert(isa<VectorType>(Val->getType()) &&
1628 "Tried to create insertelement operation on non-vector type!");
1629 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1630 && "Insertelement types must match!");
1631 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1632 "Insertelement index must be i32 type!");
1633 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1636 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1637 Constant *V2, Constant *Mask) {
1638 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1639 ReqTy->getContext(), V1, V2, Mask))
1640 return FC; // Fold a few common cases...
1641 // Look up the constant in the table first to ensure uniqueness
1642 std::vector<Constant*> ArgVec(1, V1);
1643 ArgVec.push_back(V2);
1644 ArgVec.push_back(Mask);
1645 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1647 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1649 // Implicitly locked.
1650 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1653 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1655 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1656 "Invalid shuffle vector constant expr operands!");
1658 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1659 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1660 const Type *ShufTy = VectorType::get(EltTy, NElts);
1661 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1664 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1666 const unsigned *Idxs, unsigned NumIdx) {
1667 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1668 Idxs+NumIdx) == Val->getType() &&
1669 "insertvalue indices invalid!");
1670 assert(Agg->getType() == ReqTy &&
1671 "insertvalue type invalid!");
1672 assert(Agg->getType()->isFirstClassType() &&
1673 "Non-first-class type for constant InsertValue expression");
1674 Constant *FC = ConstantFoldInsertValueInstruction(
1675 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1676 assert(FC && "InsertValue constant expr couldn't be folded!");
1680 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1681 const unsigned *IdxList, unsigned NumIdx) {
1682 assert(Agg->getType()->isFirstClassType() &&
1683 "Tried to create insertelement operation on non-first-class type!");
1685 const Type *ReqTy = Agg->getType();
1688 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1690 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1691 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1694 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1695 const unsigned *Idxs, unsigned NumIdx) {
1696 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1697 Idxs+NumIdx) == ReqTy &&
1698 "extractvalue indices invalid!");
1699 assert(Agg->getType()->isFirstClassType() &&
1700 "Non-first-class type for constant extractvalue expression");
1701 Constant *FC = ConstantFoldExtractValueInstruction(
1702 ReqTy->getContext(), Agg, Idxs, NumIdx);
1703 assert(FC && "ExtractValue constant expr couldn't be folded!");
1707 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1708 const unsigned *IdxList, unsigned NumIdx) {
1709 assert(Agg->getType()->isFirstClassType() &&
1710 "Tried to create extractelement operation on non-first-class type!");
1713 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1714 assert(ReqTy && "extractvalue indices invalid!");
1715 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1718 Constant* ConstantExpr::getNeg(Constant* C) {
1719 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1720 if (C->getType()->isFPOrFPVector())
1722 assert(C->getType()->isIntOrIntVector() &&
1723 "Cannot NEG a nonintegral value!");
1724 return get(Instruction::Sub,
1725 ConstantFP::getZeroValueForNegation(C->getType()),
1729 Constant* ConstantExpr::getFNeg(Constant* C) {
1730 assert(C->getType()->isFPOrFPVector() &&
1731 "Cannot FNEG a non-floating-point value!");
1732 return get(Instruction::FSub,
1733 ConstantFP::getZeroValueForNegation(C->getType()),
1737 Constant* ConstantExpr::getNot(Constant* C) {
1738 assert(C->getType()->isIntOrIntVector() &&
1739 "Cannot NOT a nonintegral value!");
1740 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1743 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1744 return get(Instruction::Add, C1, C2);
1747 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1748 return get(Instruction::FAdd, C1, C2);
1751 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1752 return get(Instruction::Sub, C1, C2);
1755 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1756 return get(Instruction::FSub, C1, C2);
1759 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1760 return get(Instruction::Mul, C1, C2);
1763 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1764 return get(Instruction::FMul, C1, C2);
1767 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1768 return get(Instruction::UDiv, C1, C2);
1771 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1772 return get(Instruction::SDiv, C1, C2);
1775 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1776 return get(Instruction::FDiv, C1, C2);
1779 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1780 return get(Instruction::URem, C1, C2);
1783 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1784 return get(Instruction::SRem, C1, C2);
1787 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1788 return get(Instruction::FRem, C1, C2);
1791 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1792 return get(Instruction::And, C1, C2);
1795 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1796 return get(Instruction::Or, C1, C2);
1799 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1800 return get(Instruction::Xor, C1, C2);
1803 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1804 return get(Instruction::Shl, C1, C2);
1807 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1808 return get(Instruction::LShr, C1, C2);
1811 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1812 return get(Instruction::AShr, C1, C2);
1815 // destroyConstant - Remove the constant from the constant table...
1817 void ConstantExpr::destroyConstant() {
1818 // Implicitly locked.
1819 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1820 pImpl->ExprConstants.remove(this);
1821 destroyConstantImpl();
1824 const char *ConstantExpr::getOpcodeName() const {
1825 return Instruction::getOpcodeName(getOpcode());
1828 //===----------------------------------------------------------------------===//
1829 // replaceUsesOfWithOnConstant implementations
1831 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1832 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1835 /// Note that we intentionally replace all uses of From with To here. Consider
1836 /// a large array that uses 'From' 1000 times. By handling this case all here,
1837 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1838 /// single invocation handles all 1000 uses. Handling them one at a time would
1839 /// work, but would be really slow because it would have to unique each updated
1842 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1844 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1845 Constant *ToC = cast<Constant>(To);
1847 LLVMContext &Context = getType()->getContext();
1848 LLVMContextImpl *pImpl = Context.pImpl;
1850 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1851 Lookup.first.first = getType();
1852 Lookup.second = this;
1854 std::vector<Constant*> &Values = Lookup.first.second;
1855 Values.reserve(getNumOperands()); // Build replacement array.
1857 // Fill values with the modified operands of the constant array. Also,
1858 // compute whether this turns into an all-zeros array.
1859 bool isAllZeros = false;
1860 unsigned NumUpdated = 0;
1861 if (!ToC->isNullValue()) {
1862 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1863 Constant *Val = cast<Constant>(O->get());
1868 Values.push_back(Val);
1872 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1873 Constant *Val = cast<Constant>(O->get());
1878 Values.push_back(Val);
1879 if (isAllZeros) isAllZeros = Val->isNullValue();
1883 Constant *Replacement = 0;
1885 Replacement = ConstantAggregateZero::get(getType());
1887 // Check to see if we have this array type already.
1889 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1890 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1893 Replacement = I->second;
1895 // Okay, the new shape doesn't exist in the system yet. Instead of
1896 // creating a new constant array, inserting it, replaceallusesof'ing the
1897 // old with the new, then deleting the old... just update the current one
1899 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1901 // Update to the new value. Optimize for the case when we have a single
1902 // operand that we're changing, but handle bulk updates efficiently.
1903 if (NumUpdated == 1) {
1904 unsigned OperandToUpdate = U - OperandList;
1905 assert(getOperand(OperandToUpdate) == From &&
1906 "ReplaceAllUsesWith broken!");
1907 setOperand(OperandToUpdate, ToC);
1909 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1910 if (getOperand(i) == From)
1917 // Otherwise, I do need to replace this with an existing value.
1918 assert(Replacement != this && "I didn't contain From!");
1920 // Everyone using this now uses the replacement.
1921 uncheckedReplaceAllUsesWith(Replacement);
1923 // Delete the old constant!
1927 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
1929 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1930 Constant *ToC = cast<Constant>(To);
1932 unsigned OperandToUpdate = U-OperandList;
1933 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
1935 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
1936 Lookup.first.first = getType();
1937 Lookup.second = this;
1938 std::vector<Constant*> &Values = Lookup.first.second;
1939 Values.reserve(getNumOperands()); // Build replacement struct.
1942 // Fill values with the modified operands of the constant struct. Also,
1943 // compute whether this turns into an all-zeros struct.
1944 bool isAllZeros = false;
1945 if (!ToC->isNullValue()) {
1946 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
1947 Values.push_back(cast<Constant>(O->get()));
1950 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1951 Constant *Val = cast<Constant>(O->get());
1952 Values.push_back(Val);
1953 if (isAllZeros) isAllZeros = Val->isNullValue();
1956 Values[OperandToUpdate] = ToC;
1958 LLVMContext &Context = getType()->getContext();
1959 LLVMContextImpl *pImpl = Context.pImpl;
1961 Constant *Replacement = 0;
1963 Replacement = ConstantAggregateZero::get(getType());
1965 // Check to see if we have this array type already.
1967 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
1968 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
1971 Replacement = I->second;
1973 // Okay, the new shape doesn't exist in the system yet. Instead of
1974 // creating a new constant struct, inserting it, replaceallusesof'ing the
1975 // old with the new, then deleting the old... just update the current one
1977 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
1979 // Update to the new value.
1980 setOperand(OperandToUpdate, ToC);
1985 assert(Replacement != this && "I didn't contain From!");
1987 // Everyone using this now uses the replacement.
1988 uncheckedReplaceAllUsesWith(Replacement);
1990 // Delete the old constant!
1994 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
1996 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1998 std::vector<Constant*> Values;
1999 Values.reserve(getNumOperands()); // Build replacement array...
2000 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2001 Constant *Val = getOperand(i);
2002 if (Val == From) Val = cast<Constant>(To);
2003 Values.push_back(Val);
2006 Constant *Replacement = get(getType(), Values);
2007 assert(Replacement != this && "I didn't contain From!");
2009 // Everyone using this now uses the replacement.
2010 uncheckedReplaceAllUsesWith(Replacement);
2012 // Delete the old constant!
2016 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2018 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2019 Constant *To = cast<Constant>(ToV);
2021 Constant *Replacement = 0;
2022 if (getOpcode() == Instruction::GetElementPtr) {
2023 SmallVector<Constant*, 8> Indices;
2024 Constant *Pointer = getOperand(0);
2025 Indices.reserve(getNumOperands()-1);
2026 if (Pointer == From) Pointer = To;
2028 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2029 Constant *Val = getOperand(i);
2030 if (Val == From) Val = To;
2031 Indices.push_back(Val);
2033 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2034 &Indices[0], Indices.size());
2035 } else if (getOpcode() == Instruction::ExtractValue) {
2036 Constant *Agg = getOperand(0);
2037 if (Agg == From) Agg = To;
2039 const SmallVector<unsigned, 4> &Indices = getIndices();
2040 Replacement = ConstantExpr::getExtractValue(Agg,
2041 &Indices[0], Indices.size());
2042 } else if (getOpcode() == Instruction::InsertValue) {
2043 Constant *Agg = getOperand(0);
2044 Constant *Val = getOperand(1);
2045 if (Agg == From) Agg = To;
2046 if (Val == From) Val = To;
2048 const SmallVector<unsigned, 4> &Indices = getIndices();
2049 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2050 &Indices[0], Indices.size());
2051 } else if (isCast()) {
2052 assert(getOperand(0) == From && "Cast only has one use!");
2053 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2054 } else if (getOpcode() == Instruction::Select) {
2055 Constant *C1 = getOperand(0);
2056 Constant *C2 = getOperand(1);
2057 Constant *C3 = getOperand(2);
2058 if (C1 == From) C1 = To;
2059 if (C2 == From) C2 = To;
2060 if (C3 == From) C3 = To;
2061 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2062 } else if (getOpcode() == Instruction::ExtractElement) {
2063 Constant *C1 = getOperand(0);
2064 Constant *C2 = getOperand(1);
2065 if (C1 == From) C1 = To;
2066 if (C2 == From) C2 = To;
2067 Replacement = ConstantExpr::getExtractElement(C1, C2);
2068 } else if (getOpcode() == Instruction::InsertElement) {
2069 Constant *C1 = getOperand(0);
2070 Constant *C2 = getOperand(1);
2071 Constant *C3 = getOperand(1);
2072 if (C1 == From) C1 = To;
2073 if (C2 == From) C2 = To;
2074 if (C3 == From) C3 = To;
2075 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2076 } else if (getOpcode() == Instruction::ShuffleVector) {
2077 Constant *C1 = getOperand(0);
2078 Constant *C2 = getOperand(1);
2079 Constant *C3 = getOperand(2);
2080 if (C1 == From) C1 = To;
2081 if (C2 == From) C2 = To;
2082 if (C3 == From) C3 = To;
2083 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2084 } else if (isCompare()) {
2085 Constant *C1 = getOperand(0);
2086 Constant *C2 = getOperand(1);
2087 if (C1 == From) C1 = To;
2088 if (C2 == From) C2 = To;
2089 if (getOpcode() == Instruction::ICmp)
2090 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2092 assert(getOpcode() == Instruction::FCmp);
2093 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2095 } else if (getNumOperands() == 2) {
2096 Constant *C1 = getOperand(0);
2097 Constant *C2 = getOperand(1);
2098 if (C1 == From) C1 = To;
2099 if (C2 == From) C2 = To;
2100 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassData);
2102 llvm_unreachable("Unknown ConstantExpr type!");
2106 assert(Replacement != this && "I didn't contain From!");
2108 // Everyone using this now uses the replacement.
2109 uncheckedReplaceAllUsesWith(Replacement);
2111 // Delete the old constant!