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 return pImpl->ArrayConstants.getOrCreate(Ty, V);
487 for (unsigned i = 1, e = V.size(); i != e; ++i)
489 return pImpl->ArrayConstants.getOrCreate(Ty, V);
492 return ConstantAggregateZero::get(Ty);
496 Constant* ConstantArray::get(const ArrayType* T, Constant* const* Vals,
498 // FIXME: make this the primary ctor method.
499 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
502 /// ConstantArray::get(const string&) - Return an array that is initialized to
503 /// contain the specified string. If length is zero then a null terminator is
504 /// added to the specified string so that it may be used in a natural way.
505 /// Otherwise, the length parameter specifies how much of the string to use
506 /// and it won't be null terminated.
508 Constant* ConstantArray::get(LLVMContext &Context, StringRef Str,
510 std::vector<Constant*> ElementVals;
511 for (unsigned i = 0; i < Str.size(); ++i)
512 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
514 // Add a null terminator to the string...
516 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
519 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
520 return get(ATy, ElementVals);
525 ConstantStruct::ConstantStruct(const StructType *T,
526 const std::vector<Constant*> &V)
527 : Constant(T, ConstantStructVal,
528 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
530 assert(V.size() == T->getNumElements() &&
531 "Invalid initializer vector for constant structure");
532 Use *OL = OperandList;
533 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
536 assert(C->getType() == T->getElementType(I-V.begin()) &&
537 "Initializer for struct element doesn't match struct element type!");
542 // ConstantStruct accessors.
543 Constant* ConstantStruct::get(const StructType* T,
544 const std::vector<Constant*>& V) {
545 LLVMContextImpl* pImpl = T->getContext().pImpl;
547 // Create a ConstantAggregateZero value if all elements are zeros...
548 for (unsigned i = 0, e = V.size(); i != e; ++i)
549 if (!V[i]->isNullValue())
550 return pImpl->StructConstants.getOrCreate(T, V);
552 return ConstantAggregateZero::get(T);
555 Constant* ConstantStruct::get(LLVMContext &Context,
556 const std::vector<Constant*>& V, bool packed) {
557 std::vector<const Type*> StructEls;
558 StructEls.reserve(V.size());
559 for (unsigned i = 0, e = V.size(); i != e; ++i)
560 StructEls.push_back(V[i]->getType());
561 return get(StructType::get(Context, StructEls, packed), V);
564 Constant* ConstantStruct::get(LLVMContext &Context,
565 Constant* const *Vals, unsigned NumVals,
567 // FIXME: make this the primary ctor method.
568 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
571 ConstantVector::ConstantVector(const VectorType *T,
572 const std::vector<Constant*> &V)
573 : Constant(T, ConstantVectorVal,
574 OperandTraits<ConstantVector>::op_end(this) - V.size(),
576 Use *OL = OperandList;
577 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
580 assert(C->getType() == T->getElementType() &&
581 "Initializer for vector element doesn't match vector element type!");
586 // ConstantVector accessors.
587 Constant* ConstantVector::get(const VectorType* T,
588 const std::vector<Constant*>& V) {
589 assert(!V.empty() && "Vectors can't be empty");
590 LLVMContext &Context = T->getContext();
591 LLVMContextImpl *pImpl = Context.pImpl;
593 // If this is an all-undef or alll-zero vector, return a
594 // ConstantAggregateZero or UndefValue.
596 bool isZero = C->isNullValue();
597 bool isUndef = isa<UndefValue>(C);
599 if (isZero || isUndef) {
600 for (unsigned i = 1, e = V.size(); i != e; ++i)
602 isZero = isUndef = false;
608 return ConstantAggregateZero::get(T);
610 return UndefValue::get(T);
612 return pImpl->VectorConstants.getOrCreate(T, V);
615 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
616 assert(!V.empty() && "Cannot infer type if V is empty");
617 return get(VectorType::get(V.front()->getType(),V.size()), V);
620 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
621 // FIXME: make this the primary ctor method.
622 return get(std::vector<Constant*>(Vals, Vals+NumVals));
625 Constant* ConstantExpr::getNSWNeg(Constant* C) {
626 assert(C->getType()->isIntOrIntVector() &&
627 "Cannot NEG a nonintegral value!");
628 return getNSWSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
631 Constant* ConstantExpr::getNSWAdd(Constant* C1, Constant* C2) {
632 return getTy(C1->getType(), Instruction::Add, C1, C2,
633 OverflowingBinaryOperator::NoSignedWrap);
636 Constant* ConstantExpr::getNSWSub(Constant* C1, Constant* C2) {
637 return getTy(C1->getType(), Instruction::Sub, C1, C2,
638 OverflowingBinaryOperator::NoSignedWrap);
641 Constant* ConstantExpr::getNSWMul(Constant* C1, Constant* C2) {
642 return getTy(C1->getType(), Instruction::Mul, C1, C2,
643 OverflowingBinaryOperator::NoSignedWrap);
646 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
647 return getTy(C1->getType(), Instruction::SDiv, C1, C2,
648 SDivOperator::IsExact);
651 // Utility function for determining if a ConstantExpr is a CastOp or not. This
652 // can't be inline because we don't want to #include Instruction.h into
654 bool ConstantExpr::isCast() const {
655 return Instruction::isCast(getOpcode());
658 bool ConstantExpr::isCompare() const {
659 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
662 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
663 if (getOpcode() != Instruction::GetElementPtr) return false;
665 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
666 User::const_op_iterator OI = next(this->op_begin());
668 // Skip the first index, as it has no static limit.
672 // The remaining indices must be compile-time known integers within the
673 // bounds of the corresponding notional static array types.
674 for (; GEPI != E; ++GEPI, ++OI) {
675 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
676 if (!CI) return false;
677 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
678 if (CI->getValue().getActiveBits() > 64 ||
679 CI->getZExtValue() >= ATy->getNumElements())
683 // All the indices checked out.
687 bool ConstantExpr::hasIndices() const {
688 return getOpcode() == Instruction::ExtractValue ||
689 getOpcode() == Instruction::InsertValue;
692 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
693 if (const ExtractValueConstantExpr *EVCE =
694 dyn_cast<ExtractValueConstantExpr>(this))
695 return EVCE->Indices;
697 return cast<InsertValueConstantExpr>(this)->Indices;
700 unsigned ConstantExpr::getPredicate() const {
701 assert(getOpcode() == Instruction::FCmp ||
702 getOpcode() == Instruction::ICmp);
703 return ((const CompareConstantExpr*)this)->predicate;
706 /// getWithOperandReplaced - Return a constant expression identical to this
707 /// one, but with the specified operand set to the specified value.
709 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
710 assert(OpNo < getNumOperands() && "Operand num is out of range!");
711 assert(Op->getType() == getOperand(OpNo)->getType() &&
712 "Replacing operand with value of different type!");
713 if (getOperand(OpNo) == Op)
714 return const_cast<ConstantExpr*>(this);
716 Constant *Op0, *Op1, *Op2;
717 switch (getOpcode()) {
718 case Instruction::Trunc:
719 case Instruction::ZExt:
720 case Instruction::SExt:
721 case Instruction::FPTrunc:
722 case Instruction::FPExt:
723 case Instruction::UIToFP:
724 case Instruction::SIToFP:
725 case Instruction::FPToUI:
726 case Instruction::FPToSI:
727 case Instruction::PtrToInt:
728 case Instruction::IntToPtr:
729 case Instruction::BitCast:
730 return ConstantExpr::getCast(getOpcode(), Op, getType());
731 case Instruction::Select:
732 Op0 = (OpNo == 0) ? Op : getOperand(0);
733 Op1 = (OpNo == 1) ? Op : getOperand(1);
734 Op2 = (OpNo == 2) ? Op : getOperand(2);
735 return ConstantExpr::getSelect(Op0, Op1, Op2);
736 case Instruction::InsertElement:
737 Op0 = (OpNo == 0) ? Op : getOperand(0);
738 Op1 = (OpNo == 1) ? Op : getOperand(1);
739 Op2 = (OpNo == 2) ? Op : getOperand(2);
740 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
741 case Instruction::ExtractElement:
742 Op0 = (OpNo == 0) ? Op : getOperand(0);
743 Op1 = (OpNo == 1) ? Op : getOperand(1);
744 return ConstantExpr::getExtractElement(Op0, Op1);
745 case Instruction::ShuffleVector:
746 Op0 = (OpNo == 0) ? Op : getOperand(0);
747 Op1 = (OpNo == 1) ? Op : getOperand(1);
748 Op2 = (OpNo == 2) ? Op : getOperand(2);
749 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
750 case Instruction::GetElementPtr: {
751 SmallVector<Constant*, 8> Ops;
752 Ops.resize(getNumOperands()-1);
753 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
754 Ops[i-1] = getOperand(i);
756 return cast<GEPOperator>(this)->isInBounds() ?
757 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
758 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
760 return cast<GEPOperator>(this)->isInBounds() ?
761 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0],Ops.size()):
762 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
765 assert(getNumOperands() == 2 && "Must be binary operator?");
766 Op0 = (OpNo == 0) ? Op : getOperand(0);
767 Op1 = (OpNo == 1) ? Op : getOperand(1);
768 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
772 /// getWithOperands - This returns the current constant expression with the
773 /// operands replaced with the specified values. The specified operands must
774 /// match count and type with the existing ones.
775 Constant *ConstantExpr::
776 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
777 assert(NumOps == getNumOperands() && "Operand count mismatch!");
778 bool AnyChange = false;
779 for (unsigned i = 0; i != NumOps; ++i) {
780 assert(Ops[i]->getType() == getOperand(i)->getType() &&
781 "Operand type mismatch!");
782 AnyChange |= Ops[i] != getOperand(i);
784 if (!AnyChange) // No operands changed, return self.
785 return const_cast<ConstantExpr*>(this);
787 switch (getOpcode()) {
788 case Instruction::Trunc:
789 case Instruction::ZExt:
790 case Instruction::SExt:
791 case Instruction::FPTrunc:
792 case Instruction::FPExt:
793 case Instruction::UIToFP:
794 case Instruction::SIToFP:
795 case Instruction::FPToUI:
796 case Instruction::FPToSI:
797 case Instruction::PtrToInt:
798 case Instruction::IntToPtr:
799 case Instruction::BitCast:
800 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
801 case Instruction::Select:
802 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
803 case Instruction::InsertElement:
804 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
805 case Instruction::ExtractElement:
806 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
807 case Instruction::ShuffleVector:
808 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
809 case Instruction::GetElementPtr:
810 return cast<GEPOperator>(this)->isInBounds() ?
811 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], NumOps-1) :
812 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
813 case Instruction::ICmp:
814 case Instruction::FCmp:
815 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
817 assert(getNumOperands() == 2 && "Must be binary operator?");
818 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
823 //===----------------------------------------------------------------------===//
824 // isValueValidForType implementations
826 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
827 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
828 if (Ty == Type::getInt1Ty(Ty->getContext()))
829 return Val == 0 || Val == 1;
831 return true; // always true, has to fit in largest type
832 uint64_t Max = (1ll << NumBits) - 1;
836 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
837 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
838 if (Ty == Type::getInt1Ty(Ty->getContext()))
839 return Val == 0 || Val == 1 || Val == -1;
841 return true; // always true, has to fit in largest type
842 int64_t Min = -(1ll << (NumBits-1));
843 int64_t Max = (1ll << (NumBits-1)) - 1;
844 return (Val >= Min && Val <= Max);
847 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
848 // convert modifies in place, so make a copy.
849 APFloat Val2 = APFloat(Val);
851 switch (Ty->getTypeID()) {
853 return false; // These can't be represented as floating point!
855 // FIXME rounding mode needs to be more flexible
856 case Type::FloatTyID: {
857 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
859 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
862 case Type::DoubleTyID: {
863 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
864 &Val2.getSemantics() == &APFloat::IEEEdouble)
866 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
869 case Type::X86_FP80TyID:
870 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
871 &Val2.getSemantics() == &APFloat::IEEEdouble ||
872 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
873 case Type::FP128TyID:
874 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
875 &Val2.getSemantics() == &APFloat::IEEEdouble ||
876 &Val2.getSemantics() == &APFloat::IEEEquad;
877 case Type::PPC_FP128TyID:
878 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
879 &Val2.getSemantics() == &APFloat::IEEEdouble ||
880 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
884 //===----------------------------------------------------------------------===//
885 // Factory Function Implementation
887 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
888 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
889 "Cannot create an aggregate zero of non-aggregate type!");
891 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
892 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
895 /// destroyConstant - Remove the constant from the constant table...
897 void ConstantAggregateZero::destroyConstant() {
898 getType()->getContext().pImpl->AggZeroConstants.remove(this);
899 destroyConstantImpl();
902 /// destroyConstant - Remove the constant from the constant table...
904 void ConstantArray::destroyConstant() {
905 getType()->getContext().pImpl->ArrayConstants.remove(this);
906 destroyConstantImpl();
909 /// isString - This method returns true if the array is an array of i8, and
910 /// if the elements of the array are all ConstantInt's.
911 bool ConstantArray::isString() const {
912 // Check the element type for i8...
913 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
915 // Check the elements to make sure they are all integers, not constant
917 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
918 if (!isa<ConstantInt>(getOperand(i)))
923 /// isCString - This method returns true if the array is a string (see
924 /// isString) and it ends in a null byte \\0 and does not contains any other
925 /// null bytes except its terminator.
926 bool ConstantArray::isCString() const {
927 // Check the element type for i8...
928 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
931 // Last element must be a null.
932 if (!getOperand(getNumOperands()-1)->isNullValue())
934 // Other elements must be non-null integers.
935 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
936 if (!isa<ConstantInt>(getOperand(i)))
938 if (getOperand(i)->isNullValue())
945 /// getAsString - If the sub-element type of this array is i8
946 /// then this method converts the array to an std::string and returns it.
947 /// Otherwise, it asserts out.
949 std::string ConstantArray::getAsString() const {
950 assert(isString() && "Not a string!");
952 Result.reserve(getNumOperands());
953 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
954 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
959 //---- ConstantStruct::get() implementation...
966 // destroyConstant - Remove the constant from the constant table...
968 void ConstantStruct::destroyConstant() {
969 getType()->getContext().pImpl->StructConstants.remove(this);
970 destroyConstantImpl();
973 // destroyConstant - Remove the constant from the constant table...
975 void ConstantVector::destroyConstant() {
976 getType()->getContext().pImpl->VectorConstants.remove(this);
977 destroyConstantImpl();
980 /// This function will return true iff every element in this vector constant
981 /// is set to all ones.
982 /// @returns true iff this constant's emements are all set to all ones.
983 /// @brief Determine if the value is all ones.
984 bool ConstantVector::isAllOnesValue() const {
985 // Check out first element.
986 const Constant *Elt = getOperand(0);
987 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
988 if (!CI || !CI->isAllOnesValue()) return false;
989 // Then make sure all remaining elements point to the same value.
990 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
991 if (getOperand(I) != Elt) return false;
996 /// getSplatValue - If this is a splat constant, where all of the
997 /// elements have the same value, return that value. Otherwise return null.
998 Constant *ConstantVector::getSplatValue() {
999 // Check out first element.
1000 Constant *Elt = getOperand(0);
1001 // Then make sure all remaining elements point to the same value.
1002 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1003 if (getOperand(I) != Elt) return 0;
1007 //---- ConstantPointerNull::get() implementation.
1010 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1011 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1014 // destroyConstant - Remove the constant from the constant table...
1016 void ConstantPointerNull::destroyConstant() {
1017 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1018 destroyConstantImpl();
1022 //---- UndefValue::get() implementation.
1025 UndefValue *UndefValue::get(const Type *Ty) {
1026 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1029 // destroyConstant - Remove the constant from the constant table.
1031 void UndefValue::destroyConstant() {
1032 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1033 destroyConstantImpl();
1036 //---- BlockAddress::get() implementation.
1039 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1040 assert(BB->getParent() != 0 && "Block must have a parent");
1041 return get(BB->getParent(), BB);
1044 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1046 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1048 BA = new BlockAddress(F, BB);
1050 assert(BA->getFunction() == F && "Basic block moved between functions");
1054 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1055 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1059 BB->AdjustBlockAddressRefCount(1);
1063 // destroyConstant - Remove the constant from the constant table.
1065 void BlockAddress::destroyConstant() {
1066 getFunction()->getType()->getContext().pImpl
1067 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1068 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1069 destroyConstantImpl();
1072 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1073 // This could be replacing either the Basic Block or the Function. In either
1074 // case, we have to remove the map entry.
1075 Function *NewF = getFunction();
1076 BasicBlock *NewBB = getBasicBlock();
1079 NewF = cast<Function>(To);
1081 NewBB = cast<BasicBlock>(To);
1083 // See if the 'new' entry already exists, if not, just update this in place
1084 // and return early.
1085 BlockAddress *&NewBA =
1086 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1088 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1090 // Remove the old entry, this can't cause the map to rehash (just a
1091 // tombstone will get added).
1092 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1095 setOperand(0, NewF);
1096 setOperand(1, NewBB);
1097 getBasicBlock()->AdjustBlockAddressRefCount(1);
1101 // Otherwise, I do need to replace this with an existing value.
1102 assert(NewBA != this && "I didn't contain From!");
1104 // Everyone using this now uses the replacement.
1105 uncheckedReplaceAllUsesWith(NewBA);
1110 //---- ConstantExpr::get() implementations.
1113 /// This is a utility function to handle folding of casts and lookup of the
1114 /// cast in the ExprConstants map. It is used by the various get* methods below.
1115 static inline Constant *getFoldedCast(
1116 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1117 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1118 // Fold a few common cases
1119 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1122 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1124 // Look up the constant in the table first to ensure uniqueness
1125 std::vector<Constant*> argVec(1, C);
1126 ExprMapKeyType Key(opc, argVec);
1128 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1131 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1132 Instruction::CastOps opc = Instruction::CastOps(oc);
1133 assert(Instruction::isCast(opc) && "opcode out of range");
1134 assert(C && Ty && "Null arguments to getCast");
1135 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1139 llvm_unreachable("Invalid cast opcode");
1141 case Instruction::Trunc: return getTrunc(C, Ty);
1142 case Instruction::ZExt: return getZExt(C, Ty);
1143 case Instruction::SExt: return getSExt(C, Ty);
1144 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1145 case Instruction::FPExt: return getFPExtend(C, Ty);
1146 case Instruction::UIToFP: return getUIToFP(C, Ty);
1147 case Instruction::SIToFP: return getSIToFP(C, Ty);
1148 case Instruction::FPToUI: return getFPToUI(C, Ty);
1149 case Instruction::FPToSI: return getFPToSI(C, Ty);
1150 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1151 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1152 case Instruction::BitCast: return getBitCast(C, Ty);
1157 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1158 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1159 return getCast(Instruction::BitCast, C, Ty);
1160 return getCast(Instruction::ZExt, C, Ty);
1163 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1164 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1165 return getCast(Instruction::BitCast, C, Ty);
1166 return getCast(Instruction::SExt, C, Ty);
1169 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1170 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1171 return getCast(Instruction::BitCast, C, Ty);
1172 return getCast(Instruction::Trunc, C, Ty);
1175 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1176 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1177 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1179 if (Ty->isInteger())
1180 return getCast(Instruction::PtrToInt, S, Ty);
1181 return getCast(Instruction::BitCast, S, Ty);
1184 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1186 assert(C->getType()->isIntOrIntVector() &&
1187 Ty->isIntOrIntVector() && "Invalid cast");
1188 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1189 unsigned DstBits = Ty->getScalarSizeInBits();
1190 Instruction::CastOps opcode =
1191 (SrcBits == DstBits ? Instruction::BitCast :
1192 (SrcBits > DstBits ? Instruction::Trunc :
1193 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1194 return getCast(opcode, C, Ty);
1197 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1198 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1200 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1201 unsigned DstBits = Ty->getScalarSizeInBits();
1202 if (SrcBits == DstBits)
1203 return C; // Avoid a useless cast
1204 Instruction::CastOps opcode =
1205 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1206 return getCast(opcode, C, Ty);
1209 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1211 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1212 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1214 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1215 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1216 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1217 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1218 "SrcTy must be larger than DestTy for Trunc!");
1220 return getFoldedCast(Instruction::Trunc, C, Ty);
1223 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1225 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1226 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1228 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1229 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1230 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1231 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1232 "SrcTy must be smaller than DestTy for SExt!");
1234 return getFoldedCast(Instruction::SExt, C, Ty);
1237 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1239 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1240 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1242 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1243 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1244 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1245 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1246 "SrcTy must be smaller than DestTy for ZExt!");
1248 return getFoldedCast(Instruction::ZExt, C, Ty);
1251 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1253 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1254 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1256 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1257 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1258 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1259 "This is an illegal floating point truncation!");
1260 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1263 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1265 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1266 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1268 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1269 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1270 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1271 "This is an illegal floating point extension!");
1272 return getFoldedCast(Instruction::FPExt, C, Ty);
1275 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1277 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1278 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1280 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1281 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1282 "This is an illegal uint to floating point cast!");
1283 return getFoldedCast(Instruction::UIToFP, C, Ty);
1286 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1288 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1289 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1291 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1292 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1293 "This is an illegal sint to floating point cast!");
1294 return getFoldedCast(Instruction::SIToFP, C, Ty);
1297 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1299 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1300 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1302 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1303 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1304 "This is an illegal floating point to uint cast!");
1305 return getFoldedCast(Instruction::FPToUI, C, Ty);
1308 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1310 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1311 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1313 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1314 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1315 "This is an illegal floating point to sint cast!");
1316 return getFoldedCast(Instruction::FPToSI, C, Ty);
1319 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1320 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1321 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1322 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1325 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1326 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1327 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1328 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1331 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1332 // BitCast implies a no-op cast of type only. No bits change. However, you
1333 // can't cast pointers to anything but pointers.
1335 const Type *SrcTy = C->getType();
1336 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1337 "BitCast cannot cast pointer to non-pointer and vice versa");
1339 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1340 // or nonptr->ptr). For all the other types, the cast is okay if source and
1341 // destination bit widths are identical.
1342 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1343 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1345 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1347 // It is common to ask for a bitcast of a value to its own type, handle this
1349 if (C->getType() == DstTy) return C;
1351 return getFoldedCast(Instruction::BitCast, C, DstTy);
1354 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1355 Constant *C1, Constant *C2,
1357 // Check the operands for consistency first
1358 assert(Opcode >= Instruction::BinaryOpsBegin &&
1359 Opcode < Instruction::BinaryOpsEnd &&
1360 "Invalid opcode in binary constant expression");
1361 assert(C1->getType() == C2->getType() &&
1362 "Operand types in binary constant expression should match");
1364 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1365 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1367 return FC; // Fold a few common cases...
1369 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1370 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1372 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1373 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1376 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1377 Constant *C1, Constant *C2) {
1378 switch (predicate) {
1379 default: llvm_unreachable("Invalid CmpInst predicate");
1380 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1381 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1382 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1383 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1384 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1385 case CmpInst::FCMP_TRUE:
1386 return getFCmp(predicate, C1, C2);
1388 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1389 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1390 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1391 case CmpInst::ICMP_SLE:
1392 return getICmp(predicate, C1, C2);
1396 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1398 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1399 if (C1->getType()->isFPOrFPVector()) {
1400 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1401 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1402 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1406 case Instruction::Add:
1407 case Instruction::Sub:
1408 case Instruction::Mul:
1409 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1410 assert(C1->getType()->isIntOrIntVector() &&
1411 "Tried to create an integer operation on a non-integer type!");
1413 case Instruction::FAdd:
1414 case Instruction::FSub:
1415 case Instruction::FMul:
1416 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1417 assert(C1->getType()->isFPOrFPVector() &&
1418 "Tried to create a floating-point operation on a "
1419 "non-floating-point type!");
1421 case Instruction::UDiv:
1422 case Instruction::SDiv:
1423 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1424 assert(C1->getType()->isIntOrIntVector() &&
1425 "Tried to create an arithmetic operation on a non-arithmetic type!");
1427 case Instruction::FDiv:
1428 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1429 assert(C1->getType()->isFPOrFPVector() &&
1430 "Tried to create an arithmetic operation on a non-arithmetic type!");
1432 case Instruction::URem:
1433 case Instruction::SRem:
1434 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1435 assert(C1->getType()->isIntOrIntVector() &&
1436 "Tried to create an arithmetic operation on a non-arithmetic type!");
1438 case Instruction::FRem:
1439 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1440 assert(C1->getType()->isFPOrFPVector() &&
1441 "Tried to create an arithmetic operation on a non-arithmetic type!");
1443 case Instruction::And:
1444 case Instruction::Or:
1445 case Instruction::Xor:
1446 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1447 assert(C1->getType()->isIntOrIntVector() &&
1448 "Tried to create a logical operation on a non-integral type!");
1450 case Instruction::Shl:
1451 case Instruction::LShr:
1452 case Instruction::AShr:
1453 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1454 assert(C1->getType()->isIntOrIntVector() &&
1455 "Tried to create a shift operation on a non-integer type!");
1462 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1465 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1466 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1467 // Note that a non-inbounds gep is used, as null isn't within any object.
1468 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1469 Constant *GEP = getGetElementPtr(
1470 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1471 return getCast(Instruction::PtrToInt, GEP,
1472 Type::getInt64Ty(Ty->getContext()));
1475 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1476 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1477 // Note that a non-inbounds gep is used, as null isn't within any object.
1478 const Type *AligningTy = StructType::get(Ty->getContext(),
1479 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1480 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1481 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1482 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1483 Constant *Indices[2] = { Zero, One };
1484 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1485 return getCast(Instruction::PtrToInt, GEP,
1486 Type::getInt32Ty(Ty->getContext()));
1489 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1490 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1491 // Note that a non-inbounds gep is used, as null isn't within any object.
1492 Constant *GEPIdx[] = {
1493 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1494 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1496 Constant *GEP = getGetElementPtr(
1497 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1498 return getCast(Instruction::PtrToInt, GEP,
1499 Type::getInt64Ty(STy->getContext()));
1502 Constant *ConstantExpr::getCompare(unsigned short pred,
1503 Constant *C1, Constant *C2) {
1504 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1505 return getCompareTy(pred, C1, C2);
1508 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1509 Constant *V1, Constant *V2) {
1510 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1512 if (ReqTy == V1->getType())
1513 if (Constant *SC = ConstantFoldSelectInstruction(
1514 ReqTy->getContext(), C, V1, V2))
1515 return SC; // Fold common cases
1517 std::vector<Constant*> argVec(3, C);
1520 ExprMapKeyType Key(Instruction::Select, argVec);
1522 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1523 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1526 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1529 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1531 cast<PointerType>(ReqTy)->getElementType() &&
1532 "GEP indices invalid!");
1534 if (Constant *FC = ConstantFoldGetElementPtr(
1535 ReqTy->getContext(), C, /*inBounds=*/false,
1536 (Constant**)Idxs, NumIdx))
1537 return FC; // Fold a few common cases...
1539 assert(isa<PointerType>(C->getType()) &&
1540 "Non-pointer type for constant GetElementPtr expression");
1541 // Look up the constant in the table first to ensure uniqueness
1542 std::vector<Constant*> ArgVec;
1543 ArgVec.reserve(NumIdx+1);
1544 ArgVec.push_back(C);
1545 for (unsigned i = 0; i != NumIdx; ++i)
1546 ArgVec.push_back(cast<Constant>(Idxs[i]));
1547 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1549 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1550 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1553 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1557 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1559 cast<PointerType>(ReqTy)->getElementType() &&
1560 "GEP indices invalid!");
1562 if (Constant *FC = ConstantFoldGetElementPtr(
1563 ReqTy->getContext(), C, /*inBounds=*/true,
1564 (Constant**)Idxs, NumIdx))
1565 return FC; // Fold a few common cases...
1567 assert(isa<PointerType>(C->getType()) &&
1568 "Non-pointer type for constant GetElementPtr expression");
1569 // Look up the constant in the table first to ensure uniqueness
1570 std::vector<Constant*> ArgVec;
1571 ArgVec.reserve(NumIdx+1);
1572 ArgVec.push_back(C);
1573 for (unsigned i = 0; i != NumIdx; ++i)
1574 ArgVec.push_back(cast<Constant>(Idxs[i]));
1575 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1576 GEPOperator::IsInBounds);
1578 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1579 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1582 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1584 // Get the result type of the getelementptr!
1586 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1587 assert(Ty && "GEP indices invalid!");
1588 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1589 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1592 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1595 // Get the result type of the getelementptr!
1597 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1598 assert(Ty && "GEP indices invalid!");
1599 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1600 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1603 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1605 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1608 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1609 Constant* const *Idxs,
1611 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1615 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1616 assert(LHS->getType() == RHS->getType());
1617 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1618 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1620 if (Constant *FC = ConstantFoldCompareInstruction(
1621 LHS->getContext(), pred, LHS, RHS))
1622 return FC; // Fold a few common cases...
1624 // Look up the constant in the table first to ensure uniqueness
1625 std::vector<Constant*> ArgVec;
1626 ArgVec.push_back(LHS);
1627 ArgVec.push_back(RHS);
1628 // Get the key type with both the opcode and predicate
1629 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1631 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1633 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1637 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1638 assert(LHS->getType() == RHS->getType());
1639 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1641 if (Constant *FC = ConstantFoldCompareInstruction(
1642 LHS->getContext(), pred, LHS, RHS))
1643 return FC; // Fold a few common cases...
1645 // Look up the constant in the table first to ensure uniqueness
1646 std::vector<Constant*> ArgVec;
1647 ArgVec.push_back(LHS);
1648 ArgVec.push_back(RHS);
1649 // Get the key type with both the opcode and predicate
1650 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1652 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1654 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1657 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1659 if (Constant *FC = ConstantFoldExtractElementInstruction(
1660 ReqTy->getContext(), Val, Idx))
1661 return FC; // Fold a few common cases.
1662 // Look up the constant in the table first to ensure uniqueness
1663 std::vector<Constant*> ArgVec(1, Val);
1664 ArgVec.push_back(Idx);
1665 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1667 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1668 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1671 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1672 assert(isa<VectorType>(Val->getType()) &&
1673 "Tried to create extractelement operation on non-vector type!");
1674 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1675 "Extractelement index must be i32 type!");
1676 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1680 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1681 Constant *Elt, Constant *Idx) {
1682 if (Constant *FC = ConstantFoldInsertElementInstruction(
1683 ReqTy->getContext(), Val, Elt, Idx))
1684 return FC; // Fold a few common cases.
1685 // Look up the constant in the table first to ensure uniqueness
1686 std::vector<Constant*> ArgVec(1, Val);
1687 ArgVec.push_back(Elt);
1688 ArgVec.push_back(Idx);
1689 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1691 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1692 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1695 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1697 assert(isa<VectorType>(Val->getType()) &&
1698 "Tried to create insertelement operation on non-vector type!");
1699 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1700 && "Insertelement types must match!");
1701 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1702 "Insertelement index must be i32 type!");
1703 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1706 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1707 Constant *V2, Constant *Mask) {
1708 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1709 ReqTy->getContext(), V1, V2, Mask))
1710 return FC; // Fold a few common cases...
1711 // Look up the constant in the table first to ensure uniqueness
1712 std::vector<Constant*> ArgVec(1, V1);
1713 ArgVec.push_back(V2);
1714 ArgVec.push_back(Mask);
1715 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1717 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1718 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1721 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1723 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1724 "Invalid shuffle vector constant expr operands!");
1726 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1727 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1728 const Type *ShufTy = VectorType::get(EltTy, NElts);
1729 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1732 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1734 const unsigned *Idxs, unsigned NumIdx) {
1735 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1736 Idxs+NumIdx) == Val->getType() &&
1737 "insertvalue indices invalid!");
1738 assert(Agg->getType() == ReqTy &&
1739 "insertvalue type invalid!");
1740 assert(Agg->getType()->isFirstClassType() &&
1741 "Non-first-class type for constant InsertValue expression");
1742 Constant *FC = ConstantFoldInsertValueInstruction(
1743 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1744 assert(FC && "InsertValue constant expr couldn't be folded!");
1748 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1749 const unsigned *IdxList, unsigned NumIdx) {
1750 assert(Agg->getType()->isFirstClassType() &&
1751 "Tried to create insertelement operation on non-first-class type!");
1753 const Type *ReqTy = Agg->getType();
1756 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1758 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1759 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1762 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1763 const unsigned *Idxs, unsigned NumIdx) {
1764 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1765 Idxs+NumIdx) == ReqTy &&
1766 "extractvalue indices invalid!");
1767 assert(Agg->getType()->isFirstClassType() &&
1768 "Non-first-class type for constant extractvalue expression");
1769 Constant *FC = ConstantFoldExtractValueInstruction(
1770 ReqTy->getContext(), Agg, Idxs, NumIdx);
1771 assert(FC && "ExtractValue constant expr couldn't be folded!");
1775 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1776 const unsigned *IdxList, unsigned NumIdx) {
1777 assert(Agg->getType()->isFirstClassType() &&
1778 "Tried to create extractelement operation on non-first-class type!");
1781 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1782 assert(ReqTy && "extractvalue indices invalid!");
1783 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1786 Constant* ConstantExpr::getNeg(Constant* C) {
1787 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1788 if (C->getType()->isFPOrFPVector())
1790 assert(C->getType()->isIntOrIntVector() &&
1791 "Cannot NEG a nonintegral value!");
1792 return get(Instruction::Sub,
1793 ConstantFP::getZeroValueForNegation(C->getType()),
1797 Constant* ConstantExpr::getFNeg(Constant* C) {
1798 assert(C->getType()->isFPOrFPVector() &&
1799 "Cannot FNEG a non-floating-point value!");
1800 return get(Instruction::FSub,
1801 ConstantFP::getZeroValueForNegation(C->getType()),
1805 Constant* ConstantExpr::getNot(Constant* C) {
1806 assert(C->getType()->isIntOrIntVector() &&
1807 "Cannot NOT a nonintegral value!");
1808 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1811 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1812 return get(Instruction::Add, C1, C2);
1815 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1816 return get(Instruction::FAdd, C1, C2);
1819 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1820 return get(Instruction::Sub, C1, C2);
1823 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1824 return get(Instruction::FSub, C1, C2);
1827 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1828 return get(Instruction::Mul, C1, C2);
1831 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1832 return get(Instruction::FMul, C1, C2);
1835 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1836 return get(Instruction::UDiv, C1, C2);
1839 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1840 return get(Instruction::SDiv, C1, C2);
1843 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1844 return get(Instruction::FDiv, C1, C2);
1847 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1848 return get(Instruction::URem, C1, C2);
1851 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1852 return get(Instruction::SRem, C1, C2);
1855 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1856 return get(Instruction::FRem, C1, C2);
1859 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1860 return get(Instruction::And, C1, C2);
1863 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1864 return get(Instruction::Or, C1, C2);
1867 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1868 return get(Instruction::Xor, C1, C2);
1871 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1872 return get(Instruction::Shl, C1, C2);
1875 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1876 return get(Instruction::LShr, C1, C2);
1879 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1880 return get(Instruction::AShr, C1, C2);
1883 // destroyConstant - Remove the constant from the constant table...
1885 void ConstantExpr::destroyConstant() {
1886 getType()->getContext().pImpl->ExprConstants.remove(this);
1887 destroyConstantImpl();
1890 const char *ConstantExpr::getOpcodeName() const {
1891 return Instruction::getOpcodeName(getOpcode());
1894 //===----------------------------------------------------------------------===//
1895 // replaceUsesOfWithOnConstant implementations
1897 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1898 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1901 /// Note that we intentionally replace all uses of From with To here. Consider
1902 /// a large array that uses 'From' 1000 times. By handling this case all here,
1903 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1904 /// single invocation handles all 1000 uses. Handling them one at a time would
1905 /// work, but would be really slow because it would have to unique each updated
1908 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1910 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1911 Constant *ToC = cast<Constant>(To);
1913 LLVMContext &Context = getType()->getContext();
1914 LLVMContextImpl *pImpl = Context.pImpl;
1916 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1917 Lookup.first.first = getType();
1918 Lookup.second = this;
1920 std::vector<Constant*> &Values = Lookup.first.second;
1921 Values.reserve(getNumOperands()); // Build replacement array.
1923 // Fill values with the modified operands of the constant array. Also,
1924 // compute whether this turns into an all-zeros array.
1925 bool isAllZeros = false;
1926 unsigned NumUpdated = 0;
1927 if (!ToC->isNullValue()) {
1928 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1929 Constant *Val = cast<Constant>(O->get());
1934 Values.push_back(Val);
1938 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1939 Constant *Val = cast<Constant>(O->get());
1944 Values.push_back(Val);
1945 if (isAllZeros) isAllZeros = Val->isNullValue();
1949 Constant *Replacement = 0;
1951 Replacement = ConstantAggregateZero::get(getType());
1953 // Check to see if we have this array type already.
1955 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1956 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1959 Replacement = I->second;
1961 // Okay, the new shape doesn't exist in the system yet. Instead of
1962 // creating a new constant array, inserting it, replaceallusesof'ing the
1963 // old with the new, then deleting the old... just update the current one
1965 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1967 // Update to the new value. Optimize for the case when we have a single
1968 // operand that we're changing, but handle bulk updates efficiently.
1969 if (NumUpdated == 1) {
1970 unsigned OperandToUpdate = U - OperandList;
1971 assert(getOperand(OperandToUpdate) == From &&
1972 "ReplaceAllUsesWith broken!");
1973 setOperand(OperandToUpdate, ToC);
1975 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1976 if (getOperand(i) == From)
1983 // Otherwise, I do need to replace this with an existing value.
1984 assert(Replacement != this && "I didn't contain From!");
1986 // Everyone using this now uses the replacement.
1987 uncheckedReplaceAllUsesWith(Replacement);
1989 // Delete the old constant!
1993 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
1995 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1996 Constant *ToC = cast<Constant>(To);
1998 unsigned OperandToUpdate = U-OperandList;
1999 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2001 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2002 Lookup.first.first = getType();
2003 Lookup.second = this;
2004 std::vector<Constant*> &Values = Lookup.first.second;
2005 Values.reserve(getNumOperands()); // Build replacement struct.
2008 // Fill values with the modified operands of the constant struct. Also,
2009 // compute whether this turns into an all-zeros struct.
2010 bool isAllZeros = false;
2011 if (!ToC->isNullValue()) {
2012 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2013 Values.push_back(cast<Constant>(O->get()));
2016 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2017 Constant *Val = cast<Constant>(O->get());
2018 Values.push_back(Val);
2019 if (isAllZeros) isAllZeros = Val->isNullValue();
2022 Values[OperandToUpdate] = ToC;
2024 LLVMContext &Context = getType()->getContext();
2025 LLVMContextImpl *pImpl = Context.pImpl;
2027 Constant *Replacement = 0;
2029 Replacement = ConstantAggregateZero::get(getType());
2031 // Check to see if we have this array type already.
2033 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2034 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2037 Replacement = I->second;
2039 // Okay, the new shape doesn't exist in the system yet. Instead of
2040 // creating a new constant struct, inserting it, replaceallusesof'ing the
2041 // old with the new, then deleting the old... just update the current one
2043 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2045 // Update to the new value.
2046 setOperand(OperandToUpdate, ToC);
2051 assert(Replacement != this && "I didn't contain From!");
2053 // Everyone using this now uses the replacement.
2054 uncheckedReplaceAllUsesWith(Replacement);
2056 // Delete the old constant!
2060 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2062 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2064 std::vector<Constant*> Values;
2065 Values.reserve(getNumOperands()); // Build replacement array...
2066 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2067 Constant *Val = getOperand(i);
2068 if (Val == From) Val = cast<Constant>(To);
2069 Values.push_back(Val);
2072 Constant *Replacement = get(getType(), Values);
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 ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2084 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2085 Constant *To = cast<Constant>(ToV);
2087 Constant *Replacement = 0;
2088 if (getOpcode() == Instruction::GetElementPtr) {
2089 SmallVector<Constant*, 8> Indices;
2090 Constant *Pointer = getOperand(0);
2091 Indices.reserve(getNumOperands()-1);
2092 if (Pointer == From) Pointer = To;
2094 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2095 Constant *Val = getOperand(i);
2096 if (Val == From) Val = To;
2097 Indices.push_back(Val);
2099 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2100 &Indices[0], Indices.size());
2101 } else if (getOpcode() == Instruction::ExtractValue) {
2102 Constant *Agg = getOperand(0);
2103 if (Agg == From) Agg = To;
2105 const SmallVector<unsigned, 4> &Indices = getIndices();
2106 Replacement = ConstantExpr::getExtractValue(Agg,
2107 &Indices[0], Indices.size());
2108 } else if (getOpcode() == Instruction::InsertValue) {
2109 Constant *Agg = getOperand(0);
2110 Constant *Val = getOperand(1);
2111 if (Agg == From) Agg = To;
2112 if (Val == From) Val = To;
2114 const SmallVector<unsigned, 4> &Indices = getIndices();
2115 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2116 &Indices[0], Indices.size());
2117 } else if (isCast()) {
2118 assert(getOperand(0) == From && "Cast only has one use!");
2119 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2120 } else if (getOpcode() == Instruction::Select) {
2121 Constant *C1 = getOperand(0);
2122 Constant *C2 = getOperand(1);
2123 Constant *C3 = getOperand(2);
2124 if (C1 == From) C1 = To;
2125 if (C2 == From) C2 = To;
2126 if (C3 == From) C3 = To;
2127 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2128 } else if (getOpcode() == Instruction::ExtractElement) {
2129 Constant *C1 = getOperand(0);
2130 Constant *C2 = getOperand(1);
2131 if (C1 == From) C1 = To;
2132 if (C2 == From) C2 = To;
2133 Replacement = ConstantExpr::getExtractElement(C1, C2);
2134 } else if (getOpcode() == Instruction::InsertElement) {
2135 Constant *C1 = getOperand(0);
2136 Constant *C2 = getOperand(1);
2137 Constant *C3 = getOperand(1);
2138 if (C1 == From) C1 = To;
2139 if (C2 == From) C2 = To;
2140 if (C3 == From) C3 = To;
2141 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2142 } else if (getOpcode() == Instruction::ShuffleVector) {
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::getShuffleVector(C1, C2, C3);
2150 } else if (isCompare()) {
2151 Constant *C1 = getOperand(0);
2152 Constant *C2 = getOperand(1);
2153 if (C1 == From) C1 = To;
2154 if (C2 == From) C2 = To;
2155 if (getOpcode() == Instruction::ICmp)
2156 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2158 assert(getOpcode() == Instruction::FCmp);
2159 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2161 } else if (getNumOperands() == 2) {
2162 Constant *C1 = getOperand(0);
2163 Constant *C2 = getOperand(1);
2164 if (C1 == From) C1 = To;
2165 if (C2 == From) C2 = To;
2166 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2168 llvm_unreachable("Unknown ConstantExpr type!");
2172 assert(Replacement != this && "I didn't contain From!");
2174 // Everyone using this now uses the replacement.
2175 uncheckedReplaceAllUsesWith(Replacement);
2177 // Delete the old constant!