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/ADT/DenseMap.h"
33 #include "llvm/ADT/SmallVector.h"
38 //===----------------------------------------------------------------------===//
40 //===----------------------------------------------------------------------===//
42 // Constructor to create a '0' constant of arbitrary type...
43 static const uint64_t zero[2] = {0, 0};
44 Constant *Constant::getNullValue(const Type *Ty) {
45 switch (Ty->getTypeID()) {
46 case Type::IntegerTyID:
47 return ConstantInt::get(Ty, 0);
49 return ConstantFP::get(Ty->getContext(), APFloat(APInt(32, 0)));
50 case Type::DoubleTyID:
51 return ConstantFP::get(Ty->getContext(), APFloat(APInt(64, 0)));
52 case Type::X86_FP80TyID:
53 return ConstantFP::get(Ty->getContext(), APFloat(APInt(80, 2, zero)));
55 return ConstantFP::get(Ty->getContext(),
56 APFloat(APInt(128, 2, zero), true));
57 case Type::PPC_FP128TyID:
58 return ConstantFP::get(Ty->getContext(), APFloat(APInt(128, 2, zero)));
59 case Type::PointerTyID:
60 return ConstantPointerNull::get(cast<PointerType>(Ty));
61 case Type::StructTyID:
63 case Type::VectorTyID:
64 return ConstantAggregateZero::get(Ty);
66 // Function, Label, or Opaque type?
67 assert(!"Cannot create a null constant of that type!");
72 Constant* Constant::getIntegerValue(const Type *Ty, const APInt &V) {
73 const Type *ScalarTy = Ty->getScalarType();
75 // Create the base integer constant.
76 Constant *C = ConstantInt::get(Ty->getContext(), V);
78 // Convert an integer to a pointer, if necessary.
79 if (const PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
80 C = ConstantExpr::getIntToPtr(C, PTy);
82 // Broadcast a scalar to a vector, if necessary.
83 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
84 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
89 Constant* Constant::getAllOnesValue(const Type *Ty) {
90 if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty))
91 return ConstantInt::get(Ty->getContext(),
92 APInt::getAllOnesValue(ITy->getBitWidth()));
94 std::vector<Constant*> Elts;
95 const VectorType *VTy = cast<VectorType>(Ty);
96 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
97 assert(Elts[0] && "Not a vector integer type!");
98 return cast<ConstantVector>(ConstantVector::get(Elts));
101 void Constant::destroyConstantImpl() {
102 // When a Constant is destroyed, there may be lingering
103 // references to the constant by other constants in the constant pool. These
104 // constants are implicitly dependent on the module that is being deleted,
105 // but they don't know that. Because we only find out when the CPV is
106 // deleted, we must now notify all of our users (that should only be
107 // Constants) that they are, in fact, invalid now and should be deleted.
109 while (!use_empty()) {
110 Value *V = use_back();
111 #ifndef NDEBUG // Only in -g mode...
112 if (!isa<Constant>(V)) {
113 errs() << "While deleting: " << *this
114 << "\n\nUse still stuck around after Def is destroyed: "
118 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
119 Constant *CV = cast<Constant>(V);
120 CV->destroyConstant();
122 // The constant should remove itself from our use list...
123 assert((use_empty() || use_back() != V) && "Constant not removed!");
126 // Value has no outstanding references it is safe to delete it now...
130 /// canTrap - Return true if evaluation of this constant could trap. This is
131 /// true for things like constant expressions that could divide by zero.
132 bool Constant::canTrap() const {
133 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
134 // The only thing that could possibly trap are constant exprs.
135 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
136 if (!CE) return false;
138 // ConstantExpr traps if any operands can trap.
139 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
140 if (CE->getOperand(i)->canTrap())
143 // Otherwise, only specific operations can trap.
144 switch (CE->getOpcode()) {
147 case Instruction::UDiv:
148 case Instruction::SDiv:
149 case Instruction::FDiv:
150 case Instruction::URem:
151 case Instruction::SRem:
152 case Instruction::FRem:
153 // Div and rem can trap if the RHS is not known to be non-zero.
154 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
160 /// isConstantUsed - Return true if the constant has users other than constant
161 /// exprs and other dangling things.
162 bool Constant::isConstantUsed() const {
163 for (use_const_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
164 const Constant *UC = dyn_cast<Constant>(*UI);
165 if (UC == 0 || isa<GlobalValue>(UC))
168 if (UC->isConstantUsed())
176 /// getRelocationInfo - This method classifies the entry according to
177 /// whether or not it may generate a relocation entry. This must be
178 /// conservative, so if it might codegen to a relocatable entry, it should say
179 /// so. The return values are:
181 /// NoRelocation: This constant pool entry is guaranteed to never have a
182 /// relocation applied to it (because it holds a simple constant like
184 /// LocalRelocation: This entry has relocations, but the entries are
185 /// guaranteed to be resolvable by the static linker, so the dynamic
186 /// linker will never see them.
187 /// GlobalRelocations: This entry may have arbitrary relocations.
189 /// FIXME: This really should not be in VMCore.
190 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
191 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
192 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
193 return LocalRelocation; // Local to this file/library.
194 return GlobalRelocations; // Global reference.
197 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
198 return BA->getFunction()->getRelocationInfo();
200 PossibleRelocationsTy Result = NoRelocation;
201 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
202 Result = std::max(Result,
203 cast<Constant>(getOperand(i))->getRelocationInfo());
209 /// getVectorElements - This method, which is only valid on constant of vector
210 /// type, returns the elements of the vector in the specified smallvector.
211 /// This handles breaking down a vector undef into undef elements, etc. For
212 /// constant exprs and other cases we can't handle, we return an empty vector.
213 void Constant::getVectorElements(LLVMContext &Context,
214 SmallVectorImpl<Constant*> &Elts) const {
215 assert(isa<VectorType>(getType()) && "Not a vector constant!");
217 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
218 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
219 Elts.push_back(CV->getOperand(i));
223 const VectorType *VT = cast<VectorType>(getType());
224 if (isa<ConstantAggregateZero>(this)) {
225 Elts.assign(VT->getNumElements(),
226 Constant::getNullValue(VT->getElementType()));
230 if (isa<UndefValue>(this)) {
231 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
235 // Unknown type, must be constant expr etc.
240 //===----------------------------------------------------------------------===//
242 //===----------------------------------------------------------------------===//
244 ConstantInt::ConstantInt(const IntegerType *Ty, const APInt& V)
245 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
246 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
249 ConstantInt* ConstantInt::getTrue(LLVMContext &Context) {
250 LLVMContextImpl *pImpl = Context.pImpl;
251 if (pImpl->TheTrueVal)
252 return pImpl->TheTrueVal;
254 return (pImpl->TheTrueVal =
255 ConstantInt::get(IntegerType::get(Context, 1), 1));
258 ConstantInt* ConstantInt::getFalse(LLVMContext &Context) {
259 LLVMContextImpl *pImpl = Context.pImpl;
260 if (pImpl->TheFalseVal)
261 return pImpl->TheFalseVal;
263 return (pImpl->TheFalseVal =
264 ConstantInt::get(IntegerType::get(Context, 1), 0));
268 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
269 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
270 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
271 // compare APInt's of different widths, which would violate an APInt class
272 // invariant which generates an assertion.
273 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt& V) {
274 // Get the corresponding integer type for the bit width of the value.
275 const IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
276 // get an existing value or the insertion position
277 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
278 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
279 if (!Slot) Slot = new ConstantInt(ITy, V);
283 Constant* ConstantInt::get(const Type* Ty, uint64_t V, bool isSigned) {
284 Constant *C = get(cast<IntegerType>(Ty->getScalarType()),
287 // For vectors, broadcast the value.
288 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
289 return ConstantVector::get(
290 std::vector<Constant *>(VTy->getNumElements(), C));
295 ConstantInt* ConstantInt::get(const IntegerType* Ty, uint64_t V,
297 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
300 ConstantInt* ConstantInt::getSigned(const IntegerType* Ty, int64_t V) {
301 return get(Ty, V, true);
304 Constant *ConstantInt::getSigned(const Type *Ty, int64_t V) {
305 return get(Ty, V, true);
308 Constant* ConstantInt::get(const Type* Ty, const APInt& V) {
309 ConstantInt *C = get(Ty->getContext(), V);
310 assert(C->getType() == Ty->getScalarType() &&
311 "ConstantInt type doesn't match the type implied by its value!");
313 // For vectors, broadcast the value.
314 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
315 return ConstantVector::get(
316 std::vector<Constant *>(VTy->getNumElements(), C));
321 ConstantInt* ConstantInt::get(const IntegerType* Ty, StringRef Str,
323 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
326 //===----------------------------------------------------------------------===//
328 //===----------------------------------------------------------------------===//
330 static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
332 return &APFloat::IEEEsingle;
333 if (Ty->isDoubleTy())
334 return &APFloat::IEEEdouble;
335 if (Ty->isX86_FP80Ty())
336 return &APFloat::x87DoubleExtended;
337 else if (Ty->isFP128Ty())
338 return &APFloat::IEEEquad;
340 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
341 return &APFloat::PPCDoubleDouble;
344 /// get() - This returns a constant fp for the specified value in the
345 /// specified type. This should only be used for simple constant values like
346 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
347 Constant* ConstantFP::get(const Type* Ty, double V) {
348 LLVMContext &Context = Ty->getContext();
352 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
353 APFloat::rmNearestTiesToEven, &ignored);
354 Constant *C = get(Context, FV);
356 // For vectors, broadcast the value.
357 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
358 return ConstantVector::get(
359 std::vector<Constant *>(VTy->getNumElements(), C));
365 Constant* ConstantFP::get(const Type* Ty, StringRef Str) {
366 LLVMContext &Context = Ty->getContext();
368 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
369 Constant *C = get(Context, FV);
371 // For vectors, broadcast the value.
372 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
373 return ConstantVector::get(
374 std::vector<Constant *>(VTy->getNumElements(), C));
380 ConstantFP* ConstantFP::getNegativeZero(const Type* Ty) {
381 LLVMContext &Context = Ty->getContext();
382 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
384 return get(Context, apf);
388 Constant* ConstantFP::getZeroValueForNegation(const Type* Ty) {
389 if (const VectorType *PTy = dyn_cast<VectorType>(Ty))
390 if (PTy->getElementType()->isFloatingPoint()) {
391 std::vector<Constant*> zeros(PTy->getNumElements(),
392 getNegativeZero(PTy->getElementType()));
393 return ConstantVector::get(PTy, zeros);
396 if (Ty->isFloatingPoint())
397 return getNegativeZero(Ty);
399 return Constant::getNullValue(Ty);
403 // ConstantFP accessors.
404 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
405 DenseMapAPFloatKeyInfo::KeyTy Key(V);
407 LLVMContextImpl* pImpl = Context.pImpl;
409 ConstantFP *&Slot = pImpl->FPConstants[Key];
413 if (&V.getSemantics() == &APFloat::IEEEsingle)
414 Ty = Type::getFloatTy(Context);
415 else if (&V.getSemantics() == &APFloat::IEEEdouble)
416 Ty = Type::getDoubleTy(Context);
417 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
418 Ty = Type::getX86_FP80Ty(Context);
419 else if (&V.getSemantics() == &APFloat::IEEEquad)
420 Ty = Type::getFP128Ty(Context);
422 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
423 "Unknown FP format");
424 Ty = Type::getPPC_FP128Ty(Context);
426 Slot = new ConstantFP(Ty, V);
432 ConstantFP *ConstantFP::getInfinity(const Type *Ty, bool Negative) {
433 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
434 return ConstantFP::get(Ty->getContext(),
435 APFloat::getInf(Semantics, Negative));
438 ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
439 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
440 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
444 bool ConstantFP::isNullValue() const {
445 return Val.isZero() && !Val.isNegative();
448 bool ConstantFP::isExactlyValue(const APFloat& V) const {
449 return Val.bitwiseIsEqual(V);
452 //===----------------------------------------------------------------------===//
453 // ConstantXXX Classes
454 //===----------------------------------------------------------------------===//
457 ConstantArray::ConstantArray(const ArrayType *T,
458 const std::vector<Constant*> &V)
459 : Constant(T, ConstantArrayVal,
460 OperandTraits<ConstantArray>::op_end(this) - V.size(),
462 assert(V.size() == T->getNumElements() &&
463 "Invalid initializer vector for constant array");
464 Use *OL = OperandList;
465 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
468 assert(C->getType() == T->getElementType() &&
469 "Initializer for array element doesn't match array element type!");
474 Constant *ConstantArray::get(const ArrayType *Ty,
475 const std::vector<Constant*> &V) {
476 for (unsigned i = 0, e = V.size(); i != e; ++i) {
477 assert(V[i]->getType() == Ty->getElementType() &&
478 "Wrong type in array element initializer");
480 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
481 // If this is an all-zero array, return a ConstantAggregateZero object
484 if (!C->isNullValue()) {
485 // Implicitly locked.
486 return pImpl->ArrayConstants.getOrCreate(Ty, V);
488 for (unsigned i = 1, e = V.size(); i != e; ++i)
490 // Implicitly locked.
491 return pImpl->ArrayConstants.getOrCreate(Ty, V);
495 return ConstantAggregateZero::get(Ty);
499 Constant* ConstantArray::get(const ArrayType* T, Constant* const* Vals,
501 // FIXME: make this the primary ctor method.
502 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
505 /// ConstantArray::get(const string&) - Return an array that is initialized to
506 /// contain the specified string. If length is zero then a null terminator is
507 /// added to the specified string so that it may be used in a natural way.
508 /// Otherwise, the length parameter specifies how much of the string to use
509 /// and it won't be null terminated.
511 Constant* ConstantArray::get(LLVMContext &Context, StringRef Str,
513 std::vector<Constant*> ElementVals;
514 for (unsigned i = 0; i < Str.size(); ++i)
515 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
517 // Add a null terminator to the string...
519 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
522 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
523 return get(ATy, ElementVals);
528 ConstantStruct::ConstantStruct(const StructType *T,
529 const std::vector<Constant*> &V)
530 : Constant(T, ConstantStructVal,
531 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
533 assert(V.size() == T->getNumElements() &&
534 "Invalid initializer vector for constant structure");
535 Use *OL = OperandList;
536 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
539 assert(C->getType() == T->getElementType(I-V.begin()) &&
540 "Initializer for struct element doesn't match struct element type!");
545 // ConstantStruct accessors.
546 Constant* ConstantStruct::get(const StructType* T,
547 const std::vector<Constant*>& V) {
548 LLVMContextImpl* pImpl = T->getContext().pImpl;
550 // Create a ConstantAggregateZero value if all elements are zeros...
551 for (unsigned i = 0, e = V.size(); i != e; ++i)
552 if (!V[i]->isNullValue())
553 // Implicitly locked.
554 return pImpl->StructConstants.getOrCreate(T, V);
556 return ConstantAggregateZero::get(T);
559 Constant* ConstantStruct::get(LLVMContext &Context,
560 const std::vector<Constant*>& V, bool packed) {
561 std::vector<const Type*> StructEls;
562 StructEls.reserve(V.size());
563 for (unsigned i = 0, e = V.size(); i != e; ++i)
564 StructEls.push_back(V[i]->getType());
565 return get(StructType::get(Context, StructEls, packed), V);
568 Constant* ConstantStruct::get(LLVMContext &Context,
569 Constant* const *Vals, unsigned NumVals,
571 // FIXME: make this the primary ctor method.
572 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
575 ConstantVector::ConstantVector(const VectorType *T,
576 const std::vector<Constant*> &V)
577 : Constant(T, ConstantVectorVal,
578 OperandTraits<ConstantVector>::op_end(this) - V.size(),
580 Use *OL = OperandList;
581 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
584 assert(C->getType() == T->getElementType() &&
585 "Initializer for vector element doesn't match vector element type!");
590 // ConstantVector accessors.
591 Constant* ConstantVector::get(const VectorType* T,
592 const std::vector<Constant*>& V) {
593 assert(!V.empty() && "Vectors can't be empty");
594 LLVMContext &Context = T->getContext();
595 LLVMContextImpl *pImpl = Context.pImpl;
597 // If this is an all-undef or alll-zero vector, return a
598 // ConstantAggregateZero or UndefValue.
600 bool isZero = C->isNullValue();
601 bool isUndef = isa<UndefValue>(C);
603 if (isZero || isUndef) {
604 for (unsigned i = 1, e = V.size(); i != e; ++i)
606 isZero = isUndef = false;
612 return ConstantAggregateZero::get(T);
614 return UndefValue::get(T);
616 // Implicitly locked.
617 return pImpl->VectorConstants.getOrCreate(T, V);
620 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
621 assert(!V.empty() && "Cannot infer type if V is empty");
622 return get(VectorType::get(V.front()->getType(),V.size()), V);
625 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
626 // FIXME: make this the primary ctor method.
627 return get(std::vector<Constant*>(Vals, Vals+NumVals));
630 Constant* ConstantExpr::getNSWAdd(Constant* C1, Constant* C2) {
631 return getTy(C1->getType(), Instruction::Add, C1, C2,
632 OverflowingBinaryOperator::NoSignedWrap);
635 Constant* ConstantExpr::getNSWSub(Constant* C1, Constant* C2) {
636 return getTy(C1->getType(), Instruction::Sub, C1, C2,
637 OverflowingBinaryOperator::NoSignedWrap);
640 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
641 return getTy(C1->getType(), Instruction::SDiv, C1, C2,
642 SDivOperator::IsExact);
645 // Utility function for determining if a ConstantExpr is a CastOp or not. This
646 // can't be inline because we don't want to #include Instruction.h into
648 bool ConstantExpr::isCast() const {
649 return Instruction::isCast(getOpcode());
652 bool ConstantExpr::isCompare() const {
653 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
656 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
657 if (getOpcode() != Instruction::GetElementPtr) return false;
659 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
660 User::const_op_iterator OI = next(this->op_begin());
662 // Skip the first index, as it has no static limit.
666 // The remaining indices must be compile-time known integers within the
667 // bounds of the corresponding notional static array types.
668 for (; GEPI != E; ++GEPI, ++OI) {
669 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
670 if (!CI) return false;
671 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
672 if (CI->getValue().getActiveBits() > 64 ||
673 CI->getZExtValue() >= ATy->getNumElements())
677 // All the indices checked out.
681 bool ConstantExpr::hasIndices() const {
682 return getOpcode() == Instruction::ExtractValue ||
683 getOpcode() == Instruction::InsertValue;
686 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
687 if (const ExtractValueConstantExpr *EVCE =
688 dyn_cast<ExtractValueConstantExpr>(this))
689 return EVCE->Indices;
691 return cast<InsertValueConstantExpr>(this)->Indices;
694 unsigned ConstantExpr::getPredicate() const {
695 assert(getOpcode() == Instruction::FCmp ||
696 getOpcode() == Instruction::ICmp);
697 return ((const CompareConstantExpr*)this)->predicate;
700 /// getWithOperandReplaced - Return a constant expression identical to this
701 /// one, but with the specified operand set to the specified value.
703 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
704 assert(OpNo < getNumOperands() && "Operand num is out of range!");
705 assert(Op->getType() == getOperand(OpNo)->getType() &&
706 "Replacing operand with value of different type!");
707 if (getOperand(OpNo) == Op)
708 return const_cast<ConstantExpr*>(this);
710 Constant *Op0, *Op1, *Op2;
711 switch (getOpcode()) {
712 case Instruction::Trunc:
713 case Instruction::ZExt:
714 case Instruction::SExt:
715 case Instruction::FPTrunc:
716 case Instruction::FPExt:
717 case Instruction::UIToFP:
718 case Instruction::SIToFP:
719 case Instruction::FPToUI:
720 case Instruction::FPToSI:
721 case Instruction::PtrToInt:
722 case Instruction::IntToPtr:
723 case Instruction::BitCast:
724 return ConstantExpr::getCast(getOpcode(), Op, getType());
725 case Instruction::Select:
726 Op0 = (OpNo == 0) ? Op : getOperand(0);
727 Op1 = (OpNo == 1) ? Op : getOperand(1);
728 Op2 = (OpNo == 2) ? Op : getOperand(2);
729 return ConstantExpr::getSelect(Op0, Op1, Op2);
730 case Instruction::InsertElement:
731 Op0 = (OpNo == 0) ? Op : getOperand(0);
732 Op1 = (OpNo == 1) ? Op : getOperand(1);
733 Op2 = (OpNo == 2) ? Op : getOperand(2);
734 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
735 case Instruction::ExtractElement:
736 Op0 = (OpNo == 0) ? Op : getOperand(0);
737 Op1 = (OpNo == 1) ? Op : getOperand(1);
738 return ConstantExpr::getExtractElement(Op0, Op1);
739 case Instruction::ShuffleVector:
740 Op0 = (OpNo == 0) ? Op : getOperand(0);
741 Op1 = (OpNo == 1) ? Op : getOperand(1);
742 Op2 = (OpNo == 2) ? Op : getOperand(2);
743 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
744 case Instruction::GetElementPtr: {
745 SmallVector<Constant*, 8> Ops;
746 Ops.resize(getNumOperands()-1);
747 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
748 Ops[i-1] = getOperand(i);
750 return cast<GEPOperator>(this)->isInBounds() ?
751 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
752 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
754 return cast<GEPOperator>(this)->isInBounds() ?
755 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0], Ops.size()) :
756 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
759 assert(getNumOperands() == 2 && "Must be binary operator?");
760 Op0 = (OpNo == 0) ? Op : getOperand(0);
761 Op1 = (OpNo == 1) ? Op : getOperand(1);
762 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassData);
766 /// getWithOperands - This returns the current constant expression with the
767 /// operands replaced with the specified values. The specified operands must
768 /// match count and type with the existing ones.
769 Constant *ConstantExpr::
770 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
771 assert(NumOps == getNumOperands() && "Operand count mismatch!");
772 bool AnyChange = false;
773 for (unsigned i = 0; i != NumOps; ++i) {
774 assert(Ops[i]->getType() == getOperand(i)->getType() &&
775 "Operand type mismatch!");
776 AnyChange |= Ops[i] != getOperand(i);
778 if (!AnyChange) // No operands changed, return self.
779 return const_cast<ConstantExpr*>(this);
781 switch (getOpcode()) {
782 case Instruction::Trunc:
783 case Instruction::ZExt:
784 case Instruction::SExt:
785 case Instruction::FPTrunc:
786 case Instruction::FPExt:
787 case Instruction::UIToFP:
788 case Instruction::SIToFP:
789 case Instruction::FPToUI:
790 case Instruction::FPToSI:
791 case Instruction::PtrToInt:
792 case Instruction::IntToPtr:
793 case Instruction::BitCast:
794 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
795 case Instruction::Select:
796 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
797 case Instruction::InsertElement:
798 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
799 case Instruction::ExtractElement:
800 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
801 case Instruction::ShuffleVector:
802 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
803 case Instruction::GetElementPtr:
804 return cast<GEPOperator>(this)->isInBounds() ?
805 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], NumOps-1) :
806 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
807 case Instruction::ICmp:
808 case Instruction::FCmp:
809 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
811 assert(getNumOperands() == 2 && "Must be binary operator?");
812 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassData);
817 //===----------------------------------------------------------------------===//
818 // isValueValidForType implementations
820 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
821 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
822 if (Ty == Type::getInt1Ty(Ty->getContext()))
823 return Val == 0 || Val == 1;
825 return true; // always true, has to fit in largest type
826 uint64_t Max = (1ll << NumBits) - 1;
830 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
831 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
832 if (Ty == Type::getInt1Ty(Ty->getContext()))
833 return Val == 0 || Val == 1 || Val == -1;
835 return true; // always true, has to fit in largest type
836 int64_t Min = -(1ll << (NumBits-1));
837 int64_t Max = (1ll << (NumBits-1)) - 1;
838 return (Val >= Min && Val <= Max);
841 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
842 // convert modifies in place, so make a copy.
843 APFloat Val2 = APFloat(Val);
845 switch (Ty->getTypeID()) {
847 return false; // These can't be represented as floating point!
849 // FIXME rounding mode needs to be more flexible
850 case Type::FloatTyID: {
851 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
853 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
856 case Type::DoubleTyID: {
857 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
858 &Val2.getSemantics() == &APFloat::IEEEdouble)
860 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
863 case Type::X86_FP80TyID:
864 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
865 &Val2.getSemantics() == &APFloat::IEEEdouble ||
866 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
867 case Type::FP128TyID:
868 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
869 &Val2.getSemantics() == &APFloat::IEEEdouble ||
870 &Val2.getSemantics() == &APFloat::IEEEquad;
871 case Type::PPC_FP128TyID:
872 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
873 &Val2.getSemantics() == &APFloat::IEEEdouble ||
874 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
878 //===----------------------------------------------------------------------===//
879 // Factory Function Implementation
881 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
882 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
883 "Cannot create an aggregate zero of non-aggregate type!");
885 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
886 // Implicitly locked.
887 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
890 /// destroyConstant - Remove the constant from the constant table...
892 void ConstantAggregateZero::destroyConstant() {
893 // Implicitly locked.
894 getType()->getContext().pImpl->AggZeroConstants.remove(this);
895 destroyConstantImpl();
898 /// destroyConstant - Remove the constant from the constant table...
900 void ConstantArray::destroyConstant() {
901 // Implicitly locked.
902 getType()->getContext().pImpl->ArrayConstants.remove(this);
903 destroyConstantImpl();
906 /// isString - This method returns true if the array is an array of i8, and
907 /// if the elements of the array are all ConstantInt's.
908 bool ConstantArray::isString() const {
909 // Check the element type for i8...
910 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
912 // Check the elements to make sure they are all integers, not constant
914 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
915 if (!isa<ConstantInt>(getOperand(i)))
920 /// isCString - This method returns true if the array is a string (see
921 /// isString) and it ends in a null byte \\0 and does not contains any other
922 /// null bytes except its terminator.
923 bool ConstantArray::isCString() const {
924 // Check the element type for i8...
925 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
928 // Last element must be a null.
929 if (!getOperand(getNumOperands()-1)->isNullValue())
931 // Other elements must be non-null integers.
932 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
933 if (!isa<ConstantInt>(getOperand(i)))
935 if (getOperand(i)->isNullValue())
942 /// getAsString - If the sub-element type of this array is i8
943 /// then this method converts the array to an std::string and returns it.
944 /// Otherwise, it asserts out.
946 std::string ConstantArray::getAsString() const {
947 assert(isString() && "Not a string!");
949 Result.reserve(getNumOperands());
950 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
951 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
956 //---- ConstantStruct::get() implementation...
963 // destroyConstant - Remove the constant from the constant table...
965 void ConstantStruct::destroyConstant() {
966 // Implicitly locked.
967 getType()->getContext().pImpl->StructConstants.remove(this);
968 destroyConstantImpl();
971 // destroyConstant - Remove the constant from the constant table...
973 void ConstantVector::destroyConstant() {
974 // Implicitly locked.
975 getType()->getContext().pImpl->VectorConstants.remove(this);
976 destroyConstantImpl();
979 /// This function will return true iff every element in this vector constant
980 /// is set to all ones.
981 /// @returns true iff this constant's emements are all set to all ones.
982 /// @brief Determine if the value is all ones.
983 bool ConstantVector::isAllOnesValue() const {
984 // Check out first element.
985 const Constant *Elt = getOperand(0);
986 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
987 if (!CI || !CI->isAllOnesValue()) return false;
988 // Then make sure all remaining elements point to the same value.
989 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
990 if (getOperand(I) != Elt) return false;
995 /// getSplatValue - If this is a splat constant, where all of the
996 /// elements have the same value, return that value. Otherwise return null.
997 Constant *ConstantVector::getSplatValue() {
998 // Check out first element.
999 Constant *Elt = getOperand(0);
1000 // Then make sure all remaining elements point to the same value.
1001 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1002 if (getOperand(I) != Elt) return 0;
1006 //---- ConstantPointerNull::get() implementation.
1009 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1010 // Implicitly locked.
1011 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1014 // destroyConstant - Remove the constant from the constant table...
1016 void ConstantPointerNull::destroyConstant() {
1017 // Implicitly locked.
1018 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1019 destroyConstantImpl();
1023 //---- UndefValue::get() implementation.
1026 UndefValue *UndefValue::get(const Type *Ty) {
1027 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1030 // destroyConstant - Remove the constant from the constant table.
1032 void UndefValue::destroyConstant() {
1033 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1034 destroyConstantImpl();
1037 //---- BlockAddress::get() implementation.
1040 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1041 assert(BB->getParent() != 0 && "Block must have a parent");
1042 return get(BB->getParent(), BB);
1045 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1047 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1049 BA = new BlockAddress(F, BB);
1051 assert(BA->getFunction() == F && "Basic block moved between functions");
1055 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1056 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1060 BB->AdjustBlockAddressRefCount(1);
1064 // destroyConstant - Remove the constant from the constant table.
1066 void BlockAddress::destroyConstant() {
1067 getFunction()->getType()->getContext().pImpl
1068 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1069 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1070 destroyConstantImpl();
1073 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1074 // This could be replacing either the Basic Block or the Function. In either
1075 // case, we have to remove the map entry.
1076 Function *NewF = getFunction();
1077 BasicBlock *NewBB = getBasicBlock();
1080 NewF = cast<Function>(To);
1082 NewBB = cast<BasicBlock>(To);
1084 // See if the 'new' entry already exists, if not, just update this in place
1085 // and return early.
1086 BlockAddress *&NewBA =
1087 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1089 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1091 // Remove the old entry, this can't cause the map to rehash (just a
1092 // tombstone will get added).
1093 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1096 setOperand(0, NewF);
1097 setOperand(1, NewBB);
1098 getBasicBlock()->AdjustBlockAddressRefCount(1);
1102 // Otherwise, I do need to replace this with an existing value.
1103 assert(NewBA != this && "I didn't contain From!");
1105 // Everyone using this now uses the replacement.
1106 uncheckedReplaceAllUsesWith(NewBA);
1111 //---- ConstantExpr::get() implementations.
1114 /// This is a utility function to handle folding of casts and lookup of the
1115 /// cast in the ExprConstants map. It is used by the various get* methods below.
1116 static inline Constant *getFoldedCast(
1117 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1118 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1119 // Fold a few common cases
1120 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1123 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1125 // Look up the constant in the table first to ensure uniqueness
1126 std::vector<Constant*> argVec(1, C);
1127 ExprMapKeyType Key(opc, argVec);
1129 // Implicitly locked.
1130 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1133 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1134 Instruction::CastOps opc = Instruction::CastOps(oc);
1135 assert(Instruction::isCast(opc) && "opcode out of range");
1136 assert(C && Ty && "Null arguments to getCast");
1137 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1141 llvm_unreachable("Invalid cast opcode");
1143 case Instruction::Trunc: return getTrunc(C, Ty);
1144 case Instruction::ZExt: return getZExt(C, Ty);
1145 case Instruction::SExt: return getSExt(C, Ty);
1146 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1147 case Instruction::FPExt: return getFPExtend(C, Ty);
1148 case Instruction::UIToFP: return getUIToFP(C, Ty);
1149 case Instruction::SIToFP: return getSIToFP(C, Ty);
1150 case Instruction::FPToUI: return getFPToUI(C, Ty);
1151 case Instruction::FPToSI: return getFPToSI(C, Ty);
1152 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1153 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1154 case Instruction::BitCast: return getBitCast(C, Ty);
1159 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1160 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1161 return getCast(Instruction::BitCast, C, Ty);
1162 return getCast(Instruction::ZExt, C, Ty);
1165 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1166 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1167 return getCast(Instruction::BitCast, C, Ty);
1168 return getCast(Instruction::SExt, C, Ty);
1171 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1172 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1173 return getCast(Instruction::BitCast, C, Ty);
1174 return getCast(Instruction::Trunc, C, Ty);
1177 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1178 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1179 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1181 if (Ty->isInteger())
1182 return getCast(Instruction::PtrToInt, S, Ty);
1183 return getCast(Instruction::BitCast, S, Ty);
1186 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1188 assert(C->getType()->isIntOrIntVector() &&
1189 Ty->isIntOrIntVector() && "Invalid cast");
1190 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1191 unsigned DstBits = Ty->getScalarSizeInBits();
1192 Instruction::CastOps opcode =
1193 (SrcBits == DstBits ? Instruction::BitCast :
1194 (SrcBits > DstBits ? Instruction::Trunc :
1195 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1196 return getCast(opcode, C, Ty);
1199 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1200 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1202 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1203 unsigned DstBits = Ty->getScalarSizeInBits();
1204 if (SrcBits == DstBits)
1205 return C; // Avoid a useless cast
1206 Instruction::CastOps opcode =
1207 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1208 return getCast(opcode, C, Ty);
1211 Constant *ConstantExpr::getTrunc(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()->isIntOrIntVector() && "Trunc operand must be integer");
1218 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1219 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1220 "SrcTy must be larger than DestTy for Trunc!");
1222 return getFoldedCast(Instruction::Trunc, C, Ty);
1225 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1227 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1228 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1230 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1231 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1232 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1233 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1234 "SrcTy must be smaller than DestTy for SExt!");
1236 return getFoldedCast(Instruction::SExt, C, Ty);
1239 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1241 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1242 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1244 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1245 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1246 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1247 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1248 "SrcTy must be smaller than DestTy for ZExt!");
1250 return getFoldedCast(Instruction::ZExt, C, Ty);
1253 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1255 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1256 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1258 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1259 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1260 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1261 "This is an illegal floating point truncation!");
1262 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1265 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1267 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1268 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1270 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1271 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1272 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1273 "This is an illegal floating point extension!");
1274 return getFoldedCast(Instruction::FPExt, C, Ty);
1277 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1279 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1280 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1282 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1283 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1284 "This is an illegal uint to floating point cast!");
1285 return getFoldedCast(Instruction::UIToFP, C, Ty);
1288 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1290 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1291 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1293 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1294 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1295 "This is an illegal sint to floating point cast!");
1296 return getFoldedCast(Instruction::SIToFP, C, Ty);
1299 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1301 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1302 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1304 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1305 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1306 "This is an illegal floating point to uint cast!");
1307 return getFoldedCast(Instruction::FPToUI, C, Ty);
1310 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1312 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1313 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1315 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1316 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1317 "This is an illegal floating point to sint cast!");
1318 return getFoldedCast(Instruction::FPToSI, C, Ty);
1321 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1322 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1323 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1324 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1327 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1328 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1329 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1330 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1333 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1334 // BitCast implies a no-op cast of type only. No bits change. However, you
1335 // can't cast pointers to anything but pointers.
1337 const Type *SrcTy = C->getType();
1338 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1339 "BitCast cannot cast pointer to non-pointer and vice versa");
1341 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1342 // or nonptr->ptr). For all the other types, the cast is okay if source and
1343 // destination bit widths are identical.
1344 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1345 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1347 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1349 // It is common to ask for a bitcast of a value to its own type, handle this
1351 if (C->getType() == DstTy) return C;
1353 return getFoldedCast(Instruction::BitCast, C, DstTy);
1356 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1357 Constant *C1, Constant *C2,
1359 // Check the operands for consistency first
1360 assert(Opcode >= Instruction::BinaryOpsBegin &&
1361 Opcode < Instruction::BinaryOpsEnd &&
1362 "Invalid opcode in binary constant expression");
1363 assert(C1->getType() == C2->getType() &&
1364 "Operand types in binary constant expression should match");
1366 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1367 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1369 return FC; // Fold a few common cases...
1371 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1372 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1374 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1376 // Implicitly locked.
1377 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1380 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1381 Constant *C1, Constant *C2) {
1382 switch (predicate) {
1383 default: llvm_unreachable("Invalid CmpInst predicate");
1384 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1385 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1386 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1387 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1388 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1389 case CmpInst::FCMP_TRUE:
1390 return getFCmp(predicate, C1, C2);
1392 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1393 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1394 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1395 case CmpInst::ICMP_SLE:
1396 return getICmp(predicate, C1, C2);
1400 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1402 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1403 if (C1->getType()->isFPOrFPVector()) {
1404 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1405 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1406 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1410 case Instruction::Add:
1411 case Instruction::Sub:
1412 case Instruction::Mul:
1413 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1414 assert(C1->getType()->isIntOrIntVector() &&
1415 "Tried to create an integer operation on a non-integer type!");
1417 case Instruction::FAdd:
1418 case Instruction::FSub:
1419 case Instruction::FMul:
1420 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1421 assert(C1->getType()->isFPOrFPVector() &&
1422 "Tried to create a floating-point operation on a "
1423 "non-floating-point type!");
1425 case Instruction::UDiv:
1426 case Instruction::SDiv:
1427 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1428 assert(C1->getType()->isIntOrIntVector() &&
1429 "Tried to create an arithmetic operation on a non-arithmetic type!");
1431 case Instruction::FDiv:
1432 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1433 assert(C1->getType()->isFPOrFPVector() &&
1434 "Tried to create an arithmetic operation on a non-arithmetic type!");
1436 case Instruction::URem:
1437 case Instruction::SRem:
1438 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1439 assert(C1->getType()->isIntOrIntVector() &&
1440 "Tried to create an arithmetic operation on a non-arithmetic type!");
1442 case Instruction::FRem:
1443 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1444 assert(C1->getType()->isFPOrFPVector() &&
1445 "Tried to create an arithmetic operation on a non-arithmetic type!");
1447 case Instruction::And:
1448 case Instruction::Or:
1449 case Instruction::Xor:
1450 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1451 assert(C1->getType()->isIntOrIntVector() &&
1452 "Tried to create a logical operation on a non-integral type!");
1454 case Instruction::Shl:
1455 case Instruction::LShr:
1456 case Instruction::AShr:
1457 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1458 assert(C1->getType()->isIntOrIntVector() &&
1459 "Tried to create a shift operation on a non-integer type!");
1466 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1469 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1470 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1471 // Note that a non-inbounds gep is used, as null isn't within any object.
1472 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1473 Constant *GEP = getGetElementPtr(
1474 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1475 return getCast(Instruction::PtrToInt, GEP,
1476 Type::getInt64Ty(Ty->getContext()));
1479 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1480 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1481 // Note that a non-inbounds gep is used, as null isn't within any object.
1482 const Type *AligningTy = StructType::get(Ty->getContext(),
1483 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1484 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1485 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1486 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1487 Constant *Indices[2] = { Zero, One };
1488 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1489 return getCast(Instruction::PtrToInt, GEP,
1490 Type::getInt32Ty(Ty->getContext()));
1493 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1494 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1495 // Note that a non-inbounds gep is used, as null isn't within any object.
1496 Constant *GEPIdx[] = {
1497 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1498 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1500 Constant *GEP = getGetElementPtr(
1501 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1502 return getCast(Instruction::PtrToInt, GEP,
1503 Type::getInt64Ty(STy->getContext()));
1506 Constant *ConstantExpr::getCompare(unsigned short pred,
1507 Constant *C1, Constant *C2) {
1508 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1509 return getCompareTy(pred, C1, C2);
1512 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1513 Constant *V1, Constant *V2) {
1514 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1516 if (ReqTy == V1->getType())
1517 if (Constant *SC = ConstantFoldSelectInstruction(
1518 ReqTy->getContext(), C, V1, V2))
1519 return SC; // Fold common cases
1521 std::vector<Constant*> argVec(3, C);
1524 ExprMapKeyType Key(Instruction::Select, argVec);
1526 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1528 // Implicitly locked.
1529 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1532 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1535 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1537 cast<PointerType>(ReqTy)->getElementType() &&
1538 "GEP indices invalid!");
1540 if (Constant *FC = ConstantFoldGetElementPtr(
1541 ReqTy->getContext(), C, /*inBounds=*/false,
1542 (Constant**)Idxs, NumIdx))
1543 return FC; // Fold a few common cases...
1545 assert(isa<PointerType>(C->getType()) &&
1546 "Non-pointer type for constant GetElementPtr expression");
1547 // Look up the constant in the table first to ensure uniqueness
1548 std::vector<Constant*> ArgVec;
1549 ArgVec.reserve(NumIdx+1);
1550 ArgVec.push_back(C);
1551 for (unsigned i = 0; i != NumIdx; ++i)
1552 ArgVec.push_back(cast<Constant>(Idxs[i]));
1553 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1555 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1557 // Implicitly locked.
1558 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1561 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1565 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1567 cast<PointerType>(ReqTy)->getElementType() &&
1568 "GEP indices invalid!");
1570 if (Constant *FC = ConstantFoldGetElementPtr(
1571 ReqTy->getContext(), C, /*inBounds=*/true,
1572 (Constant**)Idxs, NumIdx))
1573 return FC; // Fold a few common cases...
1575 assert(isa<PointerType>(C->getType()) &&
1576 "Non-pointer type for constant GetElementPtr expression");
1577 // Look up the constant in the table first to ensure uniqueness
1578 std::vector<Constant*> ArgVec;
1579 ArgVec.reserve(NumIdx+1);
1580 ArgVec.push_back(C);
1581 for (unsigned i = 0; i != NumIdx; ++i)
1582 ArgVec.push_back(cast<Constant>(Idxs[i]));
1583 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1584 GEPOperator::IsInBounds);
1586 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1588 // Implicitly locked.
1589 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1592 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1594 // Get the result type of the getelementptr!
1596 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1597 assert(Ty && "GEP indices invalid!");
1598 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1599 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1602 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1605 // Get the result type of the getelementptr!
1607 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1608 assert(Ty && "GEP indices invalid!");
1609 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1610 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1613 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1615 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1618 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1619 Constant* const *Idxs,
1621 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1625 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1626 assert(LHS->getType() == RHS->getType());
1627 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1628 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1630 if (Constant *FC = ConstantFoldCompareInstruction(
1631 LHS->getContext(), pred, LHS, RHS))
1632 return FC; // Fold a few common cases...
1634 // Look up the constant in the table first to ensure uniqueness
1635 std::vector<Constant*> ArgVec;
1636 ArgVec.push_back(LHS);
1637 ArgVec.push_back(RHS);
1638 // Get the key type with both the opcode and predicate
1639 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1641 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1643 // Implicitly locked.
1645 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1649 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1650 assert(LHS->getType() == RHS->getType());
1651 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1653 if (Constant *FC = ConstantFoldCompareInstruction(
1654 LHS->getContext(), pred, LHS, RHS))
1655 return FC; // Fold a few common cases...
1657 // Look up the constant in the table first to ensure uniqueness
1658 std::vector<Constant*> ArgVec;
1659 ArgVec.push_back(LHS);
1660 ArgVec.push_back(RHS);
1661 // Get the key type with both the opcode and predicate
1662 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1664 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1666 // Implicitly locked.
1668 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1671 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1673 if (Constant *FC = ConstantFoldExtractElementInstruction(
1674 ReqTy->getContext(), Val, Idx))
1675 return FC; // Fold a few common cases...
1676 // Look up the constant in the table first to ensure uniqueness
1677 std::vector<Constant*> ArgVec(1, Val);
1678 ArgVec.push_back(Idx);
1679 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1681 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1683 // Implicitly locked.
1684 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1687 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1688 assert(isa<VectorType>(Val->getType()) &&
1689 "Tried to create extractelement operation on non-vector type!");
1690 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1691 "Extractelement index must be i32 type!");
1692 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1696 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1697 Constant *Elt, Constant *Idx) {
1698 if (Constant *FC = ConstantFoldInsertElementInstruction(
1699 ReqTy->getContext(), Val, Elt, Idx))
1700 return FC; // Fold a few common cases...
1701 // Look up the constant in the table first to ensure uniqueness
1702 std::vector<Constant*> ArgVec(1, Val);
1703 ArgVec.push_back(Elt);
1704 ArgVec.push_back(Idx);
1705 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1707 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1709 // Implicitly locked.
1710 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1713 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1715 assert(isa<VectorType>(Val->getType()) &&
1716 "Tried to create insertelement operation on non-vector type!");
1717 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1718 && "Insertelement types must match!");
1719 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1720 "Insertelement index must be i32 type!");
1721 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1724 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1725 Constant *V2, Constant *Mask) {
1726 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1727 ReqTy->getContext(), V1, V2, Mask))
1728 return FC; // Fold a few common cases...
1729 // Look up the constant in the table first to ensure uniqueness
1730 std::vector<Constant*> ArgVec(1, V1);
1731 ArgVec.push_back(V2);
1732 ArgVec.push_back(Mask);
1733 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1735 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1737 // Implicitly locked.
1738 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1741 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1743 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1744 "Invalid shuffle vector constant expr operands!");
1746 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1747 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1748 const Type *ShufTy = VectorType::get(EltTy, NElts);
1749 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1752 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1754 const unsigned *Idxs, unsigned NumIdx) {
1755 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1756 Idxs+NumIdx) == Val->getType() &&
1757 "insertvalue indices invalid!");
1758 assert(Agg->getType() == ReqTy &&
1759 "insertvalue type invalid!");
1760 assert(Agg->getType()->isFirstClassType() &&
1761 "Non-first-class type for constant InsertValue expression");
1762 Constant *FC = ConstantFoldInsertValueInstruction(
1763 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1764 assert(FC && "InsertValue constant expr couldn't be folded!");
1768 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1769 const unsigned *IdxList, unsigned NumIdx) {
1770 assert(Agg->getType()->isFirstClassType() &&
1771 "Tried to create insertelement operation on non-first-class type!");
1773 const Type *ReqTy = Agg->getType();
1776 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1778 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1779 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1782 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1783 const unsigned *Idxs, unsigned NumIdx) {
1784 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1785 Idxs+NumIdx) == ReqTy &&
1786 "extractvalue indices invalid!");
1787 assert(Agg->getType()->isFirstClassType() &&
1788 "Non-first-class type for constant extractvalue expression");
1789 Constant *FC = ConstantFoldExtractValueInstruction(
1790 ReqTy->getContext(), Agg, Idxs, NumIdx);
1791 assert(FC && "ExtractValue constant expr couldn't be folded!");
1795 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1796 const unsigned *IdxList, unsigned NumIdx) {
1797 assert(Agg->getType()->isFirstClassType() &&
1798 "Tried to create extractelement operation on non-first-class type!");
1801 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1802 assert(ReqTy && "extractvalue indices invalid!");
1803 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1806 Constant* ConstantExpr::getNeg(Constant* C) {
1807 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1808 if (C->getType()->isFPOrFPVector())
1810 assert(C->getType()->isIntOrIntVector() &&
1811 "Cannot NEG a nonintegral value!");
1812 return get(Instruction::Sub,
1813 ConstantFP::getZeroValueForNegation(C->getType()),
1817 Constant* ConstantExpr::getFNeg(Constant* C) {
1818 assert(C->getType()->isFPOrFPVector() &&
1819 "Cannot FNEG a non-floating-point value!");
1820 return get(Instruction::FSub,
1821 ConstantFP::getZeroValueForNegation(C->getType()),
1825 Constant* ConstantExpr::getNot(Constant* C) {
1826 assert(C->getType()->isIntOrIntVector() &&
1827 "Cannot NOT a nonintegral value!");
1828 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1831 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1832 return get(Instruction::Add, C1, C2);
1835 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1836 return get(Instruction::FAdd, C1, C2);
1839 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1840 return get(Instruction::Sub, C1, C2);
1843 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1844 return get(Instruction::FSub, C1, C2);
1847 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1848 return get(Instruction::Mul, C1, C2);
1851 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1852 return get(Instruction::FMul, C1, C2);
1855 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1856 return get(Instruction::UDiv, C1, C2);
1859 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1860 return get(Instruction::SDiv, C1, C2);
1863 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1864 return get(Instruction::FDiv, C1, C2);
1867 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1868 return get(Instruction::URem, C1, C2);
1871 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1872 return get(Instruction::SRem, C1, C2);
1875 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1876 return get(Instruction::FRem, C1, C2);
1879 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1880 return get(Instruction::And, C1, C2);
1883 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1884 return get(Instruction::Or, C1, C2);
1887 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1888 return get(Instruction::Xor, C1, C2);
1891 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1892 return get(Instruction::Shl, C1, C2);
1895 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1896 return get(Instruction::LShr, C1, C2);
1899 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1900 return get(Instruction::AShr, C1, C2);
1903 // destroyConstant - Remove the constant from the constant table...
1905 void ConstantExpr::destroyConstant() {
1906 // Implicitly locked.
1907 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1908 pImpl->ExprConstants.remove(this);
1909 destroyConstantImpl();
1912 const char *ConstantExpr::getOpcodeName() const {
1913 return Instruction::getOpcodeName(getOpcode());
1916 //===----------------------------------------------------------------------===//
1917 // replaceUsesOfWithOnConstant implementations
1919 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1920 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1923 /// Note that we intentionally replace all uses of From with To here. Consider
1924 /// a large array that uses 'From' 1000 times. By handling this case all here,
1925 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1926 /// single invocation handles all 1000 uses. Handling them one at a time would
1927 /// work, but would be really slow because it would have to unique each updated
1930 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1932 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1933 Constant *ToC = cast<Constant>(To);
1935 LLVMContext &Context = getType()->getContext();
1936 LLVMContextImpl *pImpl = Context.pImpl;
1938 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1939 Lookup.first.first = getType();
1940 Lookup.second = this;
1942 std::vector<Constant*> &Values = Lookup.first.second;
1943 Values.reserve(getNumOperands()); // Build replacement array.
1945 // Fill values with the modified operands of the constant array. Also,
1946 // compute whether this turns into an all-zeros array.
1947 bool isAllZeros = false;
1948 unsigned NumUpdated = 0;
1949 if (!ToC->isNullValue()) {
1950 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1951 Constant *Val = cast<Constant>(O->get());
1956 Values.push_back(Val);
1960 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1961 Constant *Val = cast<Constant>(O->get());
1966 Values.push_back(Val);
1967 if (isAllZeros) isAllZeros = Val->isNullValue();
1971 Constant *Replacement = 0;
1973 Replacement = ConstantAggregateZero::get(getType());
1975 // Check to see if we have this array type already.
1977 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1978 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1981 Replacement = I->second;
1983 // Okay, the new shape doesn't exist in the system yet. Instead of
1984 // creating a new constant array, inserting it, replaceallusesof'ing the
1985 // old with the new, then deleting the old... just update the current one
1987 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1989 // Update to the new value. Optimize for the case when we have a single
1990 // operand that we're changing, but handle bulk updates efficiently.
1991 if (NumUpdated == 1) {
1992 unsigned OperandToUpdate = U - OperandList;
1993 assert(getOperand(OperandToUpdate) == From &&
1994 "ReplaceAllUsesWith broken!");
1995 setOperand(OperandToUpdate, ToC);
1997 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1998 if (getOperand(i) == From)
2005 // Otherwise, I do need to replace this with an existing value.
2006 assert(Replacement != this && "I didn't contain From!");
2008 // Everyone using this now uses the replacement.
2009 uncheckedReplaceAllUsesWith(Replacement);
2011 // Delete the old constant!
2015 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2017 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2018 Constant *ToC = cast<Constant>(To);
2020 unsigned OperandToUpdate = U-OperandList;
2021 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2023 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2024 Lookup.first.first = getType();
2025 Lookup.second = this;
2026 std::vector<Constant*> &Values = Lookup.first.second;
2027 Values.reserve(getNumOperands()); // Build replacement struct.
2030 // Fill values with the modified operands of the constant struct. Also,
2031 // compute whether this turns into an all-zeros struct.
2032 bool isAllZeros = false;
2033 if (!ToC->isNullValue()) {
2034 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2035 Values.push_back(cast<Constant>(O->get()));
2038 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2039 Constant *Val = cast<Constant>(O->get());
2040 Values.push_back(Val);
2041 if (isAllZeros) isAllZeros = Val->isNullValue();
2044 Values[OperandToUpdate] = ToC;
2046 LLVMContext &Context = getType()->getContext();
2047 LLVMContextImpl *pImpl = Context.pImpl;
2049 Constant *Replacement = 0;
2051 Replacement = ConstantAggregateZero::get(getType());
2053 // Check to see if we have this array type already.
2055 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2056 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2059 Replacement = I->second;
2061 // Okay, the new shape doesn't exist in the system yet. Instead of
2062 // creating a new constant struct, inserting it, replaceallusesof'ing the
2063 // old with the new, then deleting the old... just update the current one
2065 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2067 // Update to the new value.
2068 setOperand(OperandToUpdate, ToC);
2073 assert(Replacement != this && "I didn't contain From!");
2075 // Everyone using this now uses the replacement.
2076 uncheckedReplaceAllUsesWith(Replacement);
2078 // Delete the old constant!
2082 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2084 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2086 std::vector<Constant*> Values;
2087 Values.reserve(getNumOperands()); // Build replacement array...
2088 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2089 Constant *Val = getOperand(i);
2090 if (Val == From) Val = cast<Constant>(To);
2091 Values.push_back(Val);
2094 Constant *Replacement = get(getType(), Values);
2095 assert(Replacement != this && "I didn't contain From!");
2097 // Everyone using this now uses the replacement.
2098 uncheckedReplaceAllUsesWith(Replacement);
2100 // Delete the old constant!
2104 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2106 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2107 Constant *To = cast<Constant>(ToV);
2109 Constant *Replacement = 0;
2110 if (getOpcode() == Instruction::GetElementPtr) {
2111 SmallVector<Constant*, 8> Indices;
2112 Constant *Pointer = getOperand(0);
2113 Indices.reserve(getNumOperands()-1);
2114 if (Pointer == From) Pointer = To;
2116 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2117 Constant *Val = getOperand(i);
2118 if (Val == From) Val = To;
2119 Indices.push_back(Val);
2121 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2122 &Indices[0], Indices.size());
2123 } else if (getOpcode() == Instruction::ExtractValue) {
2124 Constant *Agg = getOperand(0);
2125 if (Agg == From) Agg = To;
2127 const SmallVector<unsigned, 4> &Indices = getIndices();
2128 Replacement = ConstantExpr::getExtractValue(Agg,
2129 &Indices[0], Indices.size());
2130 } else if (getOpcode() == Instruction::InsertValue) {
2131 Constant *Agg = getOperand(0);
2132 Constant *Val = getOperand(1);
2133 if (Agg == From) Agg = To;
2134 if (Val == From) Val = To;
2136 const SmallVector<unsigned, 4> &Indices = getIndices();
2137 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2138 &Indices[0], Indices.size());
2139 } else if (isCast()) {
2140 assert(getOperand(0) == From && "Cast only has one use!");
2141 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2142 } else if (getOpcode() == Instruction::Select) {
2143 Constant *C1 = getOperand(0);
2144 Constant *C2 = getOperand(1);
2145 Constant *C3 = getOperand(2);
2146 if (C1 == From) C1 = To;
2147 if (C2 == From) C2 = To;
2148 if (C3 == From) C3 = To;
2149 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2150 } else if (getOpcode() == Instruction::ExtractElement) {
2151 Constant *C1 = getOperand(0);
2152 Constant *C2 = getOperand(1);
2153 if (C1 == From) C1 = To;
2154 if (C2 == From) C2 = To;
2155 Replacement = ConstantExpr::getExtractElement(C1, C2);
2156 } else if (getOpcode() == Instruction::InsertElement) {
2157 Constant *C1 = getOperand(0);
2158 Constant *C2 = getOperand(1);
2159 Constant *C3 = getOperand(1);
2160 if (C1 == From) C1 = To;
2161 if (C2 == From) C2 = To;
2162 if (C3 == From) C3 = To;
2163 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2164 } else if (getOpcode() == Instruction::ShuffleVector) {
2165 Constant *C1 = getOperand(0);
2166 Constant *C2 = getOperand(1);
2167 Constant *C3 = getOperand(2);
2168 if (C1 == From) C1 = To;
2169 if (C2 == From) C2 = To;
2170 if (C3 == From) C3 = To;
2171 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2172 } else if (isCompare()) {
2173 Constant *C1 = getOperand(0);
2174 Constant *C2 = getOperand(1);
2175 if (C1 == From) C1 = To;
2176 if (C2 == From) C2 = To;
2177 if (getOpcode() == Instruction::ICmp)
2178 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2180 assert(getOpcode() == Instruction::FCmp);
2181 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2183 } else if (getNumOperands() == 2) {
2184 Constant *C1 = getOperand(0);
2185 Constant *C2 = getOperand(1);
2186 if (C1 == From) C1 = To;
2187 if (C2 == From) C2 = To;
2188 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassData);
2190 llvm_unreachable("Unknown ConstantExpr type!");
2194 assert(Replacement != this && "I didn't contain From!");
2196 // Everyone using this now uses the replacement.
2197 uncheckedReplaceAllUsesWith(Replacement);
2199 // Delete the old constant!