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 Constant *Constant::getNullValue(const Type *Ty) {
44 switch (Ty->getTypeID()) {
45 case Type::IntegerTyID:
46 return ConstantInt::get(Ty, 0);
48 return ConstantFP::get(Ty->getContext(),
49 APFloat::getZero(APFloat::IEEEsingle));
50 case Type::DoubleTyID:
51 return ConstantFP::get(Ty->getContext(),
52 APFloat::getZero(APFloat::IEEEdouble));
53 case Type::X86_FP80TyID:
54 return ConstantFP::get(Ty->getContext(),
55 APFloat::getZero(APFloat::x87DoubleExtended));
57 return ConstantFP::get(Ty->getContext(),
58 APFloat::getZero(APFloat::IEEEquad));
59 case Type::PPC_FP128TyID:
60 return ConstantFP::get(Ty->getContext(),
61 APFloat(APInt::getNullValue(128)));
62 case Type::PointerTyID:
63 return ConstantPointerNull::get(cast<PointerType>(Ty));
64 case Type::StructTyID:
66 case Type::VectorTyID:
67 return ConstantAggregateZero::get(Ty);
69 // Function, Label, or Opaque type?
70 assert(!"Cannot create a null constant of that type!");
75 Constant *Constant::getIntegerValue(const Type *Ty, const APInt &V) {
76 const Type *ScalarTy = Ty->getScalarType();
78 // Create the base integer constant.
79 Constant *C = ConstantInt::get(Ty->getContext(), V);
81 // Convert an integer to a pointer, if necessary.
82 if (const PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
83 C = ConstantExpr::getIntToPtr(C, PTy);
85 // Broadcast a scalar to a vector, if necessary.
86 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
87 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
92 Constant *Constant::getAllOnesValue(const Type *Ty) {
93 if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty))
94 return ConstantInt::get(Ty->getContext(),
95 APInt::getAllOnesValue(ITy->getBitWidth()));
97 if (Ty->isFloatingPointTy()) {
98 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
99 !Ty->isPPC_FP128Ty());
100 return ConstantFP::get(Ty->getContext(), FL);
103 SmallVector<Constant*, 16> Elts;
104 const VectorType *VTy = cast<VectorType>(Ty);
105 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
106 assert(Elts[0] && "Not a vector integer type!");
107 return cast<ConstantVector>(ConstantVector::get(Elts));
110 void Constant::destroyConstantImpl() {
111 // When a Constant is destroyed, there may be lingering
112 // references to the constant by other constants in the constant pool. These
113 // constants are implicitly dependent on the module that is being deleted,
114 // but they don't know that. Because we only find out when the CPV is
115 // deleted, we must now notify all of our users (that should only be
116 // Constants) that they are, in fact, invalid now and should be deleted.
118 while (!use_empty()) {
119 Value *V = use_back();
120 #ifndef NDEBUG // Only in -g mode...
121 if (!isa<Constant>(V)) {
122 dbgs() << "While deleting: " << *this
123 << "\n\nUse still stuck around after Def is destroyed: "
127 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
128 Constant *CV = cast<Constant>(V);
129 CV->destroyConstant();
131 // The constant should remove itself from our use list...
132 assert((use_empty() || use_back() != V) && "Constant not removed!");
135 // Value has no outstanding references it is safe to delete it now...
139 /// canTrap - Return true if evaluation of this constant could trap. This is
140 /// true for things like constant expressions that could divide by zero.
141 bool Constant::canTrap() const {
142 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
143 // The only thing that could possibly trap are constant exprs.
144 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
145 if (!CE) return false;
147 // ConstantExpr traps if any operands can trap.
148 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
149 if (CE->getOperand(i)->canTrap())
152 // Otherwise, only specific operations can trap.
153 switch (CE->getOpcode()) {
156 case Instruction::UDiv:
157 case Instruction::SDiv:
158 case Instruction::FDiv:
159 case Instruction::URem:
160 case Instruction::SRem:
161 case Instruction::FRem:
162 // Div and rem can trap if the RHS is not known to be non-zero.
163 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
169 /// isConstantUsed - Return true if the constant has users other than constant
170 /// exprs and other dangling things.
171 bool Constant::isConstantUsed() const {
172 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
173 const Constant *UC = dyn_cast<Constant>(*UI);
174 if (UC == 0 || isa<GlobalValue>(UC))
177 if (UC->isConstantUsed())
185 /// getRelocationInfo - This method classifies the entry according to
186 /// whether or not it may generate a relocation entry. This must be
187 /// conservative, so if it might codegen to a relocatable entry, it should say
188 /// so. The return values are:
190 /// NoRelocation: This constant pool entry is guaranteed to never have a
191 /// relocation applied to it (because it holds a simple constant like
193 /// LocalRelocation: This entry has relocations, but the entries are
194 /// guaranteed to be resolvable by the static linker, so the dynamic
195 /// linker will never see them.
196 /// GlobalRelocations: This entry may have arbitrary relocations.
198 /// FIXME: This really should not be in VMCore.
199 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
200 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
201 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
202 return LocalRelocation; // Local to this file/library.
203 return GlobalRelocations; // Global reference.
206 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
207 return BA->getFunction()->getRelocationInfo();
209 // While raw uses of blockaddress need to be relocated, differences between
210 // two of them don't when they are for labels in the same function. This is a
211 // common idiom when creating a table for the indirect goto extension, so we
212 // handle it efficiently here.
213 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
214 if (CE->getOpcode() == Instruction::Sub) {
215 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
216 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
218 LHS->getOpcode() == Instruction::PtrToInt &&
219 RHS->getOpcode() == Instruction::PtrToInt &&
220 isa<BlockAddress>(LHS->getOperand(0)) &&
221 isa<BlockAddress>(RHS->getOperand(0)) &&
222 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
223 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
227 PossibleRelocationsTy Result = NoRelocation;
228 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
229 Result = std::max(Result,
230 cast<Constant>(getOperand(i))->getRelocationInfo());
236 /// getVectorElements - This method, which is only valid on constant of vector
237 /// type, returns the elements of the vector in the specified smallvector.
238 /// This handles breaking down a vector undef into undef elements, etc. For
239 /// constant exprs and other cases we can't handle, we return an empty vector.
240 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
241 assert(getType()->isVectorTy() && "Not a vector constant!");
243 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
244 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
245 Elts.push_back(CV->getOperand(i));
249 const VectorType *VT = cast<VectorType>(getType());
250 if (isa<ConstantAggregateZero>(this)) {
251 Elts.assign(VT->getNumElements(),
252 Constant::getNullValue(VT->getElementType()));
256 if (isa<UndefValue>(this)) {
257 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
261 // Unknown type, must be constant expr etc.
265 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
266 /// it. This involves recursively eliminating any dead users of the
268 static bool removeDeadUsersOfConstant(const Constant *C) {
269 if (isa<GlobalValue>(C)) return false; // Cannot remove this
271 while (!C->use_empty()) {
272 const Constant *User = dyn_cast<Constant>(C->use_back());
273 if (!User) return false; // Non-constant usage;
274 if (!removeDeadUsersOfConstant(User))
275 return false; // Constant wasn't dead
278 const_cast<Constant*>(C)->destroyConstant();
283 /// removeDeadConstantUsers - If there are any dead constant users dangling
284 /// off of this constant, remove them. This method is useful for clients
285 /// that want to check to see if a global is unused, but don't want to deal
286 /// with potentially dead constants hanging off of the globals.
287 void Constant::removeDeadConstantUsers() const {
288 Value::const_use_iterator I = use_begin(), E = use_end();
289 Value::const_use_iterator LastNonDeadUser = E;
291 const Constant *User = dyn_cast<Constant>(*I);
298 if (!removeDeadUsersOfConstant(User)) {
299 // If the constant wasn't dead, remember that this was the last live use
300 // and move on to the next constant.
306 // If the constant was dead, then the iterator is invalidated.
307 if (LastNonDeadUser == E) {
319 //===----------------------------------------------------------------------===//
321 //===----------------------------------------------------------------------===//
323 ConstantInt::ConstantInt(const IntegerType *Ty, const APInt& V)
324 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
325 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
328 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
329 LLVMContextImpl *pImpl = Context.pImpl;
330 if (!pImpl->TheTrueVal)
331 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
332 return pImpl->TheTrueVal;
335 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
336 LLVMContextImpl *pImpl = Context.pImpl;
337 if (!pImpl->TheFalseVal)
338 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
339 return pImpl->TheFalseVal;
342 Constant *ConstantInt::getTrue(const Type *Ty) {
343 const VectorType *VTy = dyn_cast<VectorType>(Ty);
345 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
346 return ConstantInt::getTrue(Ty->getContext());
348 assert(VTy->getElementType()->isIntegerTy(1) &&
349 "True must be vector of i1 or i1.");
350 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
351 ConstantInt::getTrue(Ty->getContext()));
352 return ConstantVector::get(Splat);
355 Constant *ConstantInt::getFalse(const Type *Ty) {
356 const VectorType *VTy = dyn_cast<VectorType>(Ty);
358 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
359 return ConstantInt::getFalse(Ty->getContext());
361 assert(VTy->getElementType()->isIntegerTy(1) &&
362 "False must be vector of i1 or i1.");
363 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
364 ConstantInt::getFalse(Ty->getContext()));
365 return ConstantVector::get(Splat);
369 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
370 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
371 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
372 // compare APInt's of different widths, which would violate an APInt class
373 // invariant which generates an assertion.
374 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
375 // Get the corresponding integer type for the bit width of the value.
376 const IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
377 // get an existing value or the insertion position
378 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
379 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
380 if (!Slot) Slot = new ConstantInt(ITy, V);
384 Constant *ConstantInt::get(const Type *Ty, uint64_t V, bool isSigned) {
385 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
387 // For vectors, broadcast the value.
388 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
389 return ConstantVector::get(SmallVector<Constant*,
390 16>(VTy->getNumElements(), C));
395 ConstantInt* ConstantInt::get(const IntegerType* Ty, uint64_t V,
397 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
400 ConstantInt* ConstantInt::getSigned(const IntegerType* Ty, int64_t V) {
401 return get(Ty, V, true);
404 Constant *ConstantInt::getSigned(const Type *Ty, int64_t V) {
405 return get(Ty, V, true);
408 Constant *ConstantInt::get(const Type* Ty, const APInt& V) {
409 ConstantInt *C = get(Ty->getContext(), V);
410 assert(C->getType() == Ty->getScalarType() &&
411 "ConstantInt type doesn't match the type implied by its value!");
413 // For vectors, broadcast the value.
414 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
415 return ConstantVector::get(
416 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
421 ConstantInt* ConstantInt::get(const IntegerType* Ty, StringRef Str,
423 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
426 //===----------------------------------------------------------------------===//
428 //===----------------------------------------------------------------------===//
430 static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
432 return &APFloat::IEEEsingle;
433 if (Ty->isDoubleTy())
434 return &APFloat::IEEEdouble;
435 if (Ty->isX86_FP80Ty())
436 return &APFloat::x87DoubleExtended;
437 else if (Ty->isFP128Ty())
438 return &APFloat::IEEEquad;
440 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
441 return &APFloat::PPCDoubleDouble;
444 /// get() - This returns a constant fp for the specified value in the
445 /// specified type. This should only be used for simple constant values like
446 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
447 Constant *ConstantFP::get(const Type* Ty, double V) {
448 LLVMContext &Context = Ty->getContext();
452 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
453 APFloat::rmNearestTiesToEven, &ignored);
454 Constant *C = get(Context, FV);
456 // For vectors, broadcast the value.
457 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
458 return ConstantVector::get(
459 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
465 Constant *ConstantFP::get(const Type* Ty, StringRef Str) {
466 LLVMContext &Context = Ty->getContext();
468 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
469 Constant *C = get(Context, FV);
471 // For vectors, broadcast the value.
472 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
473 return ConstantVector::get(
474 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
480 ConstantFP* ConstantFP::getNegativeZero(const Type* Ty) {
481 LLVMContext &Context = Ty->getContext();
482 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
484 return get(Context, apf);
488 Constant *ConstantFP::getZeroValueForNegation(const Type* Ty) {
489 if (const VectorType *PTy = dyn_cast<VectorType>(Ty))
490 if (PTy->getElementType()->isFloatingPointTy()) {
491 SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
492 getNegativeZero(PTy->getElementType()));
493 return ConstantVector::get(zeros);
496 if (Ty->isFloatingPointTy())
497 return getNegativeZero(Ty);
499 return Constant::getNullValue(Ty);
503 // ConstantFP accessors.
504 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
505 DenseMapAPFloatKeyInfo::KeyTy Key(V);
507 LLVMContextImpl* pImpl = Context.pImpl;
509 ConstantFP *&Slot = pImpl->FPConstants[Key];
513 if (&V.getSemantics() == &APFloat::IEEEsingle)
514 Ty = Type::getFloatTy(Context);
515 else if (&V.getSemantics() == &APFloat::IEEEdouble)
516 Ty = Type::getDoubleTy(Context);
517 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
518 Ty = Type::getX86_FP80Ty(Context);
519 else if (&V.getSemantics() == &APFloat::IEEEquad)
520 Ty = Type::getFP128Ty(Context);
522 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
523 "Unknown FP format");
524 Ty = Type::getPPC_FP128Ty(Context);
526 Slot = new ConstantFP(Ty, V);
532 ConstantFP *ConstantFP::getInfinity(const Type *Ty, bool Negative) {
533 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
534 return ConstantFP::get(Ty->getContext(),
535 APFloat::getInf(Semantics, Negative));
538 ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
539 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
540 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
544 bool ConstantFP::isNullValue() const {
545 return Val.isZero() && !Val.isNegative();
548 bool ConstantFP::isExactlyValue(const APFloat& V) const {
549 return Val.bitwiseIsEqual(V);
552 //===----------------------------------------------------------------------===//
553 // ConstantXXX Classes
554 //===----------------------------------------------------------------------===//
557 ConstantArray::ConstantArray(const ArrayType *T,
558 const std::vector<Constant*> &V)
559 : Constant(T, ConstantArrayVal,
560 OperandTraits<ConstantArray>::op_end(this) - V.size(),
562 assert(V.size() == T->getNumElements() &&
563 "Invalid initializer vector for constant array");
564 Use *OL = OperandList;
565 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
568 assert(C->getType() == T->getElementType() &&
569 "Initializer for array element doesn't match array element type!");
574 Constant *ConstantArray::get(const ArrayType *Ty, ArrayRef<Constant*> V) {
575 for (unsigned i = 0, e = V.size(); i != e; ++i) {
576 assert(V[i]->getType() == Ty->getElementType() &&
577 "Wrong type in array element initializer");
579 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
580 // If this is an all-zero array, return a ConstantAggregateZero object
583 if (!C->isNullValue())
584 return pImpl->ArrayConstants.getOrCreate(Ty, V);
586 for (unsigned i = 1, e = V.size(); i != e; ++i)
588 return pImpl->ArrayConstants.getOrCreate(Ty, V);
591 return ConstantAggregateZero::get(Ty);
594 /// ConstantArray::get(const string&) - Return an array that is initialized to
595 /// contain the specified string. If length is zero then a null terminator is
596 /// added to the specified string so that it may be used in a natural way.
597 /// Otherwise, the length parameter specifies how much of the string to use
598 /// and it won't be null terminated.
600 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
602 std::vector<Constant*> ElementVals;
603 ElementVals.reserve(Str.size() + size_t(AddNull));
604 for (unsigned i = 0; i < Str.size(); ++i)
605 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
607 // Add a null terminator to the string...
609 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
612 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
613 return get(ATy, ElementVals);
616 /// getTypeForElements - Return an anonymous struct type to use for a constant
617 /// with the specified set of elements. The list must not be empty.
618 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
619 ArrayRef<Constant*> V,
621 SmallVector<const Type*, 16> EltTypes;
622 for (unsigned i = 0, e = V.size(); i != e; ++i)
623 EltTypes.push_back(V[i]->getType());
625 return StructType::get(Context, EltTypes, Packed);
629 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
632 "ConstantStruct::getTypeForElements cannot be called on empty list");
633 return getTypeForElements(V[0]->getContext(), V, Packed);
637 ConstantStruct::ConstantStruct(const StructType *T,
638 const std::vector<Constant*> &V)
639 : Constant(T, ConstantStructVal,
640 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
642 assert(V.size() == T->getNumElements() &&
643 "Invalid initializer vector for constant structure");
644 Use *OL = OperandList;
645 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
648 assert(C->getType() == T->getElementType(I-V.begin()) &&
649 "Initializer for struct element doesn't match struct element type!");
654 // ConstantStruct accessors.
655 Constant *ConstantStruct::get(const StructType *ST, ArrayRef<Constant*> V) {
656 assert(ST->getNumElements() == V.size() &&
657 "Incorrect # elements specified to ConstantStruct::get");
659 // Create a ConstantAggregateZero value if all elements are zeros.
660 for (unsigned i = 0, e = V.size(); i != e; ++i)
661 if (!V[i]->isNullValue())
662 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
664 return ConstantAggregateZero::get(ST);
667 Constant* ConstantStruct::get(const StructType *T, ...) {
669 SmallVector<Constant*, 8> Values;
671 while (Constant *Val = va_arg(ap, llvm::Constant*))
672 Values.push_back(Val);
674 return get(T, Values);
677 ConstantVector::ConstantVector(const VectorType *T,
678 const std::vector<Constant*> &V)
679 : Constant(T, ConstantVectorVal,
680 OperandTraits<ConstantVector>::op_end(this) - V.size(),
682 Use *OL = OperandList;
683 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
686 assert(C->getType() == T->getElementType() &&
687 "Initializer for vector element doesn't match vector element type!");
692 // ConstantVector accessors.
693 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
694 assert(!V.empty() && "Vectors can't be empty");
695 const VectorType *T = VectorType::get(V.front()->getType(), V.size());
696 LLVMContextImpl *pImpl = T->getContext().pImpl;
698 // If this is an all-undef or all-zero vector, return a
699 // ConstantAggregateZero or UndefValue.
701 bool isZero = C->isNullValue();
702 bool isUndef = isa<UndefValue>(C);
704 if (isZero || isUndef) {
705 for (unsigned i = 1, e = V.size(); i != e; ++i)
707 isZero = isUndef = false;
713 return ConstantAggregateZero::get(T);
715 return UndefValue::get(T);
717 return pImpl->VectorConstants.getOrCreate(T, V);
720 // Utility function for determining if a ConstantExpr is a CastOp or not. This
721 // can't be inline because we don't want to #include Instruction.h into
723 bool ConstantExpr::isCast() const {
724 return Instruction::isCast(getOpcode());
727 bool ConstantExpr::isCompare() const {
728 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
731 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
732 if (getOpcode() != Instruction::GetElementPtr) return false;
734 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
735 User::const_op_iterator OI = llvm::next(this->op_begin());
737 // Skip the first index, as it has no static limit.
741 // The remaining indices must be compile-time known integers within the
742 // bounds of the corresponding notional static array types.
743 for (; GEPI != E; ++GEPI, ++OI) {
744 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
745 if (!CI) return false;
746 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
747 if (CI->getValue().getActiveBits() > 64 ||
748 CI->getZExtValue() >= ATy->getNumElements())
752 // All the indices checked out.
756 bool ConstantExpr::hasIndices() const {
757 return getOpcode() == Instruction::ExtractValue ||
758 getOpcode() == Instruction::InsertValue;
761 ArrayRef<unsigned> ConstantExpr::getIndices() const {
762 if (const ExtractValueConstantExpr *EVCE =
763 dyn_cast<ExtractValueConstantExpr>(this))
764 return EVCE->Indices;
766 return cast<InsertValueConstantExpr>(this)->Indices;
769 unsigned ConstantExpr::getPredicate() const {
770 assert(getOpcode() == Instruction::FCmp ||
771 getOpcode() == Instruction::ICmp);
772 return ((const CompareConstantExpr*)this)->predicate;
775 /// getWithOperandReplaced - Return a constant expression identical to this
776 /// one, but with the specified operand set to the specified value.
778 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
779 assert(OpNo < getNumOperands() && "Operand num is out of range!");
780 assert(Op->getType() == getOperand(OpNo)->getType() &&
781 "Replacing operand with value of different type!");
782 if (getOperand(OpNo) == Op)
783 return const_cast<ConstantExpr*>(this);
785 Constant *Op0, *Op1, *Op2;
786 switch (getOpcode()) {
787 case Instruction::Trunc:
788 case Instruction::ZExt:
789 case Instruction::SExt:
790 case Instruction::FPTrunc:
791 case Instruction::FPExt:
792 case Instruction::UIToFP:
793 case Instruction::SIToFP:
794 case Instruction::FPToUI:
795 case Instruction::FPToSI:
796 case Instruction::PtrToInt:
797 case Instruction::IntToPtr:
798 case Instruction::BitCast:
799 return ConstantExpr::getCast(getOpcode(), Op, getType());
800 case Instruction::Select:
801 Op0 = (OpNo == 0) ? Op : getOperand(0);
802 Op1 = (OpNo == 1) ? Op : getOperand(1);
803 Op2 = (OpNo == 2) ? Op : getOperand(2);
804 return ConstantExpr::getSelect(Op0, Op1, Op2);
805 case Instruction::InsertElement:
806 Op0 = (OpNo == 0) ? Op : getOperand(0);
807 Op1 = (OpNo == 1) ? Op : getOperand(1);
808 Op2 = (OpNo == 2) ? Op : getOperand(2);
809 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
810 case Instruction::ExtractElement:
811 Op0 = (OpNo == 0) ? Op : getOperand(0);
812 Op1 = (OpNo == 1) ? Op : getOperand(1);
813 return ConstantExpr::getExtractElement(Op0, Op1);
814 case Instruction::ShuffleVector:
815 Op0 = (OpNo == 0) ? Op : getOperand(0);
816 Op1 = (OpNo == 1) ? Op : getOperand(1);
817 Op2 = (OpNo == 2) ? Op : getOperand(2);
818 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
819 case Instruction::GetElementPtr: {
820 SmallVector<Constant*, 8> Ops;
821 Ops.resize(getNumOperands()-1);
822 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
823 Ops[i-1] = getOperand(i);
825 return cast<GEPOperator>(this)->isInBounds() ?
826 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
827 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
829 return cast<GEPOperator>(this)->isInBounds() ?
830 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0],Ops.size()):
831 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
834 assert(getNumOperands() == 2 && "Must be binary operator?");
835 Op0 = (OpNo == 0) ? Op : getOperand(0);
836 Op1 = (OpNo == 1) ? Op : getOperand(1);
837 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
841 /// getWithOperands - This returns the current constant expression with the
842 /// operands replaced with the specified values. The specified operands must
843 /// match count and type with the existing ones.
844 Constant *ConstantExpr::
845 getWithOperands(ArrayRef<Constant*> Ops) const {
846 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
847 bool AnyChange = false;
848 for (unsigned i = 0; i != Ops.size(); ++i) {
849 assert(Ops[i]->getType() == getOperand(i)->getType() &&
850 "Operand type mismatch!");
851 AnyChange |= Ops[i] != getOperand(i);
853 if (!AnyChange) // No operands changed, return self.
854 return const_cast<ConstantExpr*>(this);
856 switch (getOpcode()) {
857 case Instruction::Trunc:
858 case Instruction::ZExt:
859 case Instruction::SExt:
860 case Instruction::FPTrunc:
861 case Instruction::FPExt:
862 case Instruction::UIToFP:
863 case Instruction::SIToFP:
864 case Instruction::FPToUI:
865 case Instruction::FPToSI:
866 case Instruction::PtrToInt:
867 case Instruction::IntToPtr:
868 case Instruction::BitCast:
869 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
870 case Instruction::Select:
871 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
872 case Instruction::InsertElement:
873 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
874 case Instruction::ExtractElement:
875 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
876 case Instruction::ShuffleVector:
877 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
878 case Instruction::GetElementPtr:
879 return cast<GEPOperator>(this)->isInBounds() ?
880 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], Ops.size()-1) :
881 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], Ops.size()-1);
882 case Instruction::ICmp:
883 case Instruction::FCmp:
884 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
886 assert(getNumOperands() == 2 && "Must be binary operator?");
887 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
892 //===----------------------------------------------------------------------===//
893 // isValueValidForType implementations
895 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
896 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
897 if (Ty == Type::getInt1Ty(Ty->getContext()))
898 return Val == 0 || Val == 1;
900 return true; // always true, has to fit in largest type
901 uint64_t Max = (1ll << NumBits) - 1;
905 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
906 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
907 if (Ty == Type::getInt1Ty(Ty->getContext()))
908 return Val == 0 || Val == 1 || Val == -1;
910 return true; // always true, has to fit in largest type
911 int64_t Min = -(1ll << (NumBits-1));
912 int64_t Max = (1ll << (NumBits-1)) - 1;
913 return (Val >= Min && Val <= Max);
916 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
917 // convert modifies in place, so make a copy.
918 APFloat Val2 = APFloat(Val);
920 switch (Ty->getTypeID()) {
922 return false; // These can't be represented as floating point!
924 // FIXME rounding mode needs to be more flexible
925 case Type::FloatTyID: {
926 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
928 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
931 case Type::DoubleTyID: {
932 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
933 &Val2.getSemantics() == &APFloat::IEEEdouble)
935 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
938 case Type::X86_FP80TyID:
939 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
940 &Val2.getSemantics() == &APFloat::IEEEdouble ||
941 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
942 case Type::FP128TyID:
943 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
944 &Val2.getSemantics() == &APFloat::IEEEdouble ||
945 &Val2.getSemantics() == &APFloat::IEEEquad;
946 case Type::PPC_FP128TyID:
947 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
948 &Val2.getSemantics() == &APFloat::IEEEdouble ||
949 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
953 //===----------------------------------------------------------------------===//
954 // Factory Function Implementation
956 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
957 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
958 "Cannot create an aggregate zero of non-aggregate type!");
960 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
961 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
964 /// destroyConstant - Remove the constant from the constant table...
966 void ConstantAggregateZero::destroyConstant() {
967 getRawType()->getContext().pImpl->AggZeroConstants.remove(this);
968 destroyConstantImpl();
971 /// destroyConstant - Remove the constant from the constant table...
973 void ConstantArray::destroyConstant() {
974 getRawType()->getContext().pImpl->ArrayConstants.remove(this);
975 destroyConstantImpl();
978 /// isString - This method returns true if the array is an array of i8, and
979 /// if the elements of the array are all ConstantInt's.
980 bool ConstantArray::isString() const {
981 // Check the element type for i8...
982 if (!getType()->getElementType()->isIntegerTy(8))
984 // Check the elements to make sure they are all integers, not constant
986 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
987 if (!isa<ConstantInt>(getOperand(i)))
992 /// isCString - This method returns true if the array is a string (see
993 /// isString) and it ends in a null byte \\0 and does not contains any other
994 /// null bytes except its terminator.
995 bool ConstantArray::isCString() const {
996 // Check the element type for i8...
997 if (!getType()->getElementType()->isIntegerTy(8))
1000 // Last element must be a null.
1001 if (!getOperand(getNumOperands()-1)->isNullValue())
1003 // Other elements must be non-null integers.
1004 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1005 if (!isa<ConstantInt>(getOperand(i)))
1007 if (getOperand(i)->isNullValue())
1014 /// getAsString - If the sub-element type of this array is i8
1015 /// then this method converts the array to an std::string and returns it.
1016 /// Otherwise, it asserts out.
1018 std::string ConstantArray::getAsString() const {
1019 assert(isString() && "Not a string!");
1021 Result.reserve(getNumOperands());
1022 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1023 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
1028 //---- ConstantStruct::get() implementation...
1035 // destroyConstant - Remove the constant from the constant table...
1037 void ConstantStruct::destroyConstant() {
1038 getRawType()->getContext().pImpl->StructConstants.remove(this);
1039 destroyConstantImpl();
1042 // destroyConstant - Remove the constant from the constant table...
1044 void ConstantVector::destroyConstant() {
1045 getRawType()->getContext().pImpl->VectorConstants.remove(this);
1046 destroyConstantImpl();
1049 /// This function will return true iff every element in this vector constant
1050 /// is set to all ones.
1051 /// @returns true iff this constant's emements are all set to all ones.
1052 /// @brief Determine if the value is all ones.
1053 bool ConstantVector::isAllOnesValue() const {
1054 // Check out first element.
1055 const Constant *Elt = getOperand(0);
1056 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
1057 if (!CI || !CI->isAllOnesValue()) return false;
1058 // Then make sure all remaining elements point to the same value.
1059 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
1060 if (getOperand(I) != Elt) return false;
1065 /// getSplatValue - If this is a splat constant, where all of the
1066 /// elements have the same value, return that value. Otherwise return null.
1067 Constant *ConstantVector::getSplatValue() const {
1068 // Check out first element.
1069 Constant *Elt = getOperand(0);
1070 // Then make sure all remaining elements point to the same value.
1071 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1072 if (getOperand(I) != Elt) return 0;
1076 //---- ConstantPointerNull::get() implementation.
1079 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1080 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1083 // destroyConstant - Remove the constant from the constant table...
1085 void ConstantPointerNull::destroyConstant() {
1086 getRawType()->getContext().pImpl->NullPtrConstants.remove(this);
1087 destroyConstantImpl();
1091 //---- UndefValue::get() implementation.
1094 UndefValue *UndefValue::get(const Type *Ty) {
1095 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1098 // destroyConstant - Remove the constant from the constant table.
1100 void UndefValue::destroyConstant() {
1101 getRawType()->getContext().pImpl->UndefValueConstants.remove(this);
1102 destroyConstantImpl();
1105 //---- BlockAddress::get() implementation.
1108 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1109 assert(BB->getParent() != 0 && "Block must have a parent");
1110 return get(BB->getParent(), BB);
1113 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1115 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1117 BA = new BlockAddress(F, BB);
1119 assert(BA->getFunction() == F && "Basic block moved between functions");
1123 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1124 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1128 BB->AdjustBlockAddressRefCount(1);
1132 // destroyConstant - Remove the constant from the constant table.
1134 void BlockAddress::destroyConstant() {
1135 getFunction()->getRawType()->getContext().pImpl
1136 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1137 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1138 destroyConstantImpl();
1141 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1142 // This could be replacing either the Basic Block or the Function. In either
1143 // case, we have to remove the map entry.
1144 Function *NewF = getFunction();
1145 BasicBlock *NewBB = getBasicBlock();
1148 NewF = cast<Function>(To);
1150 NewBB = cast<BasicBlock>(To);
1152 // See if the 'new' entry already exists, if not, just update this in place
1153 // and return early.
1154 BlockAddress *&NewBA =
1155 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1157 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1159 // Remove the old entry, this can't cause the map to rehash (just a
1160 // tombstone will get added).
1161 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1164 setOperand(0, NewF);
1165 setOperand(1, NewBB);
1166 getBasicBlock()->AdjustBlockAddressRefCount(1);
1170 // Otherwise, I do need to replace this with an existing value.
1171 assert(NewBA != this && "I didn't contain From!");
1173 // Everyone using this now uses the replacement.
1174 uncheckedReplaceAllUsesWith(NewBA);
1179 //---- ConstantExpr::get() implementations.
1182 /// This is a utility function to handle folding of casts and lookup of the
1183 /// cast in the ExprConstants map. It is used by the various get* methods below.
1184 static inline Constant *getFoldedCast(
1185 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1186 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1187 // Fold a few common cases
1188 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1191 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1193 // Look up the constant in the table first to ensure uniqueness
1194 std::vector<Constant*> argVec(1, C);
1195 ExprMapKeyType Key(opc, argVec);
1197 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1200 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1201 Instruction::CastOps opc = Instruction::CastOps(oc);
1202 assert(Instruction::isCast(opc) && "opcode out of range");
1203 assert(C && Ty && "Null arguments to getCast");
1204 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1208 llvm_unreachable("Invalid cast opcode");
1210 case Instruction::Trunc: return getTrunc(C, Ty);
1211 case Instruction::ZExt: return getZExt(C, Ty);
1212 case Instruction::SExt: return getSExt(C, Ty);
1213 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1214 case Instruction::FPExt: return getFPExtend(C, Ty);
1215 case Instruction::UIToFP: return getUIToFP(C, Ty);
1216 case Instruction::SIToFP: return getSIToFP(C, Ty);
1217 case Instruction::FPToUI: return getFPToUI(C, Ty);
1218 case Instruction::FPToSI: return getFPToSI(C, Ty);
1219 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1220 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1221 case Instruction::BitCast: return getBitCast(C, Ty);
1226 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1227 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1228 return getBitCast(C, Ty);
1229 return getZExt(C, Ty);
1232 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1233 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1234 return getBitCast(C, Ty);
1235 return getSExt(C, Ty);
1238 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1239 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1240 return getBitCast(C, Ty);
1241 return getTrunc(C, Ty);
1244 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1245 assert(S->getType()->isPointerTy() && "Invalid cast");
1246 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1248 if (Ty->isIntegerTy())
1249 return getPtrToInt(S, Ty);
1250 return getBitCast(S, Ty);
1253 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1255 assert(C->getType()->isIntOrIntVectorTy() &&
1256 Ty->isIntOrIntVectorTy() && "Invalid cast");
1257 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1258 unsigned DstBits = Ty->getScalarSizeInBits();
1259 Instruction::CastOps opcode =
1260 (SrcBits == DstBits ? Instruction::BitCast :
1261 (SrcBits > DstBits ? Instruction::Trunc :
1262 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1263 return getCast(opcode, C, Ty);
1266 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1267 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1269 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1270 unsigned DstBits = Ty->getScalarSizeInBits();
1271 if (SrcBits == DstBits)
1272 return C; // Avoid a useless cast
1273 Instruction::CastOps opcode =
1274 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1275 return getCast(opcode, C, Ty);
1278 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1280 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1281 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1283 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1284 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1285 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1286 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1287 "SrcTy must be larger than DestTy for Trunc!");
1289 return getFoldedCast(Instruction::Trunc, C, Ty);
1292 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1294 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1295 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1297 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1298 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1299 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1300 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1301 "SrcTy must be smaller than DestTy for SExt!");
1303 return getFoldedCast(Instruction::SExt, C, Ty);
1306 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1308 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1309 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1311 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1312 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1313 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1314 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1315 "SrcTy must be smaller than DestTy for ZExt!");
1317 return getFoldedCast(Instruction::ZExt, C, Ty);
1320 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1322 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1323 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1325 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1326 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1327 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1328 "This is an illegal floating point truncation!");
1329 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1332 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1334 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1335 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1337 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1338 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1339 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1340 "This is an illegal floating point extension!");
1341 return getFoldedCast(Instruction::FPExt, C, Ty);
1344 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1346 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1347 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1349 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1350 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1351 "This is an illegal uint to floating point cast!");
1352 return getFoldedCast(Instruction::UIToFP, C, Ty);
1355 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1357 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1358 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1360 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1361 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1362 "This is an illegal sint to floating point cast!");
1363 return getFoldedCast(Instruction::SIToFP, C, Ty);
1366 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1368 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1369 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1371 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1372 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1373 "This is an illegal floating point to uint cast!");
1374 return getFoldedCast(Instruction::FPToUI, C, Ty);
1377 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1379 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1380 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1382 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1383 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1384 "This is an illegal floating point to sint cast!");
1385 return getFoldedCast(Instruction::FPToSI, C, Ty);
1388 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1389 assert(C->getType()->isPointerTy() && "PtrToInt source must be pointer");
1390 assert(DstTy->isIntegerTy() && "PtrToInt destination must be integral");
1391 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1394 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1395 assert(C->getType()->isIntegerTy() && "IntToPtr source must be integral");
1396 assert(DstTy->isPointerTy() && "IntToPtr destination must be a pointer");
1397 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1400 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1401 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1402 "Invalid constantexpr bitcast!");
1404 // It is common to ask for a bitcast of a value to its own type, handle this
1406 if (C->getType() == DstTy) return C;
1408 return getFoldedCast(Instruction::BitCast, C, DstTy);
1411 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1412 Constant *C1, Constant *C2,
1414 // Check the operands for consistency first
1415 assert(Opcode >= Instruction::BinaryOpsBegin &&
1416 Opcode < Instruction::BinaryOpsEnd &&
1417 "Invalid opcode in binary constant expression");
1418 assert(C1->getType() == C2->getType() &&
1419 "Operand types in binary constant expression should match");
1421 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1422 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1423 return FC; // Fold a few common cases...
1425 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1426 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1428 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1429 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1432 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1433 Constant *C1, Constant *C2) {
1434 switch (predicate) {
1435 default: llvm_unreachable("Invalid CmpInst predicate");
1436 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1437 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1438 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1439 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1440 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1441 case CmpInst::FCMP_TRUE:
1442 return getFCmp(predicate, C1, C2);
1444 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1445 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1446 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1447 case CmpInst::ICMP_SLE:
1448 return getICmp(predicate, C1, C2);
1452 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1456 case Instruction::Add:
1457 case Instruction::Sub:
1458 case Instruction::Mul:
1459 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1460 assert(C1->getType()->isIntOrIntVectorTy() &&
1461 "Tried to create an integer operation on a non-integer type!");
1463 case Instruction::FAdd:
1464 case Instruction::FSub:
1465 case Instruction::FMul:
1466 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1467 assert(C1->getType()->isFPOrFPVectorTy() &&
1468 "Tried to create a floating-point operation on a "
1469 "non-floating-point type!");
1471 case Instruction::UDiv:
1472 case Instruction::SDiv:
1473 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1474 assert(C1->getType()->isIntOrIntVectorTy() &&
1475 "Tried to create an arithmetic operation on a non-arithmetic type!");
1477 case Instruction::FDiv:
1478 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1479 assert(C1->getType()->isFPOrFPVectorTy() &&
1480 "Tried to create an arithmetic operation on a non-arithmetic type!");
1482 case Instruction::URem:
1483 case Instruction::SRem:
1484 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1485 assert(C1->getType()->isIntOrIntVectorTy() &&
1486 "Tried to create an arithmetic operation on a non-arithmetic type!");
1488 case Instruction::FRem:
1489 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1490 assert(C1->getType()->isFPOrFPVectorTy() &&
1491 "Tried to create an arithmetic operation on a non-arithmetic type!");
1493 case Instruction::And:
1494 case Instruction::Or:
1495 case Instruction::Xor:
1496 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1497 assert(C1->getType()->isIntOrIntVectorTy() &&
1498 "Tried to create a logical operation on a non-integral type!");
1500 case Instruction::Shl:
1501 case Instruction::LShr:
1502 case Instruction::AShr:
1503 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1504 assert(C1->getType()->isIntOrIntVectorTy() &&
1505 "Tried to create a shift operation on a non-integer type!");
1512 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1515 Constant *ConstantExpr::getSizeOf(const Type* Ty) {
1516 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1517 // Note that a non-inbounds gep is used, as null isn't within any object.
1518 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1519 Constant *GEP = getGetElementPtr(
1520 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1521 return getPtrToInt(GEP,
1522 Type::getInt64Ty(Ty->getContext()));
1525 Constant *ConstantExpr::getAlignOf(const Type* Ty) {
1526 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1527 // Note that a non-inbounds gep is used, as null isn't within any object.
1528 const Type *AligningTy =
1529 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1530 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1531 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1532 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1533 Constant *Indices[2] = { Zero, One };
1534 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1535 return getPtrToInt(GEP,
1536 Type::getInt64Ty(Ty->getContext()));
1539 Constant *ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1540 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1544 Constant *ConstantExpr::getOffsetOf(const Type* Ty, Constant *FieldNo) {
1545 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1546 // Note that a non-inbounds gep is used, as null isn't within any object.
1547 Constant *GEPIdx[] = {
1548 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1551 Constant *GEP = getGetElementPtr(
1552 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx, 2);
1553 return getPtrToInt(GEP,
1554 Type::getInt64Ty(Ty->getContext()));
1557 Constant *ConstantExpr::getCompare(unsigned short pred,
1558 Constant *C1, Constant *C2) {
1559 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1560 return getCompareTy(pred, C1, C2);
1563 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1564 Constant *V1, Constant *V2) {
1565 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1567 if (ReqTy == V1->getType())
1568 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1569 return SC; // Fold common cases
1571 std::vector<Constant*> argVec(3, C);
1574 ExprMapKeyType Key(Instruction::Select, argVec);
1576 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1577 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1580 template<typename IndexTy>
1581 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1582 IndexTy const *Idxs,
1583 unsigned NumIdx, bool InBounds) {
1584 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1586 cast<PointerType>(ReqTy)->getElementType() &&
1587 "GEP indices invalid!");
1589 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs, NumIdx))
1590 return FC; // Fold a few common cases.
1592 assert(C->getType()->isPointerTy() &&
1593 "Non-pointer type for constant GetElementPtr expression");
1594 // Look up the constant in the table first to ensure uniqueness
1595 std::vector<Constant*> ArgVec;
1596 ArgVec.reserve(NumIdx+1);
1597 ArgVec.push_back(C);
1598 for (unsigned i = 0; i != NumIdx; ++i)
1599 ArgVec.push_back(cast<Constant>(Idxs[i]));
1600 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1601 InBounds ? GEPOperator::IsInBounds : 0);
1603 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1604 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1607 template<typename IndexTy>
1608 Constant *ConstantExpr::getGetElementPtrImpl(Constant *C, IndexTy const *Idxs,
1609 unsigned NumIdx, bool InBounds) {
1610 // Get the result type of the getelementptr!
1612 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1613 assert(Ty && "GEP indices invalid!");
1614 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1615 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx,InBounds);
1618 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1619 unsigned NumIdx, bool InBounds) {
1620 return getGetElementPtrImpl(C, Idxs, NumIdx, InBounds);
1623 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant *const *Idxs,
1624 unsigned NumIdx, bool InBounds) {
1625 return getGetElementPtrImpl(C, Idxs, NumIdx, InBounds);
1629 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1630 assert(LHS->getType() == RHS->getType());
1631 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1632 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1634 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1635 return FC; // Fold a few common cases...
1637 // Look up the constant in the table first to ensure uniqueness
1638 std::vector<Constant*> ArgVec;
1639 ArgVec.push_back(LHS);
1640 ArgVec.push_back(RHS);
1641 // Get the key type with both the opcode and predicate
1642 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1644 const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1645 if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1646 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1648 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1649 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1653 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1654 assert(LHS->getType() == RHS->getType());
1655 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1657 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1658 return FC; // Fold a few common cases...
1660 // Look up the constant in the table first to ensure uniqueness
1661 std::vector<Constant*> ArgVec;
1662 ArgVec.push_back(LHS);
1663 ArgVec.push_back(RHS);
1664 // Get the key type with both the opcode and predicate
1665 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1667 const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1668 if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1669 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1671 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1672 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1675 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1677 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1678 return FC; // Fold a few common cases.
1679 // Look up the constant in the table first to ensure uniqueness
1680 std::vector<Constant*> ArgVec(1, Val);
1681 ArgVec.push_back(Idx);
1682 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1684 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1685 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1688 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1689 assert(Val->getType()->isVectorTy() &&
1690 "Tried to create extractelement operation on non-vector type!");
1691 assert(Idx->getType()->isIntegerTy(32) &&
1692 "Extractelement index must be i32 type!");
1693 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1697 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1698 Constant *Elt, Constant *Idx) {
1699 if (Constant *FC = ConstantFoldInsertElementInstruction(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;
1708 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1711 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1713 assert(Val->getType()->isVectorTy() &&
1714 "Tried to create insertelement operation on non-vector type!");
1715 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1716 && "Insertelement types must match!");
1717 assert(Idx->getType()->isIntegerTy(32) &&
1718 "Insertelement index must be i32 type!");
1719 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1722 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1723 Constant *V2, Constant *Mask) {
1724 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1725 return FC; // Fold a few common cases...
1726 // Look up the constant in the table first to ensure uniqueness
1727 std::vector<Constant*> ArgVec(1, V1);
1728 ArgVec.push_back(V2);
1729 ArgVec.push_back(Mask);
1730 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1732 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1733 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1736 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1738 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1739 "Invalid shuffle vector constant expr operands!");
1741 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1742 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1743 const Type *ShufTy = VectorType::get(EltTy, NElts);
1744 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1747 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1749 const unsigned *Idxs, unsigned NumIdx) {
1750 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1751 Idxs+NumIdx) == Val->getType() &&
1752 "insertvalue indices invalid!");
1753 assert(Agg->getType() == ReqTy &&
1754 "insertvalue type invalid!");
1755 assert(Agg->getType()->isFirstClassType() &&
1756 "Non-first-class type for constant InsertValue expression");
1757 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs, NumIdx);
1758 assert(FC && "InsertValue constant expr couldn't be folded!");
1762 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1763 const unsigned *IdxList, unsigned NumIdx) {
1764 assert(Agg->getType()->isFirstClassType() &&
1765 "Tried to create insertelement operation on non-first-class type!");
1767 const Type *ReqTy = Agg->getType();
1770 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1772 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1773 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1776 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1777 const unsigned *Idxs, unsigned NumIdx) {
1778 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1779 Idxs+NumIdx) == ReqTy &&
1780 "extractvalue indices invalid!");
1781 assert(Agg->getType()->isFirstClassType() &&
1782 "Non-first-class type for constant extractvalue expression");
1783 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs, NumIdx);
1784 assert(FC && "ExtractValue constant expr couldn't be folded!");
1788 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1789 const unsigned *IdxList, unsigned NumIdx) {
1790 assert(Agg->getType()->isFirstClassType() &&
1791 "Tried to create extractelement operation on non-first-class type!");
1794 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1795 assert(ReqTy && "extractvalue indices invalid!");
1796 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1799 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1800 assert(C->getType()->isIntOrIntVectorTy() &&
1801 "Cannot NEG a nonintegral value!");
1802 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1806 Constant *ConstantExpr::getFNeg(Constant *C) {
1807 assert(C->getType()->isFPOrFPVectorTy() &&
1808 "Cannot FNEG a non-floating-point value!");
1809 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1812 Constant *ConstantExpr::getNot(Constant *C) {
1813 assert(C->getType()->isIntOrIntVectorTy() &&
1814 "Cannot NOT a nonintegral value!");
1815 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1818 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1819 bool HasNUW, bool HasNSW) {
1820 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1821 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1822 return get(Instruction::Add, C1, C2, Flags);
1825 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1826 return get(Instruction::FAdd, C1, C2);
1829 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1830 bool HasNUW, bool HasNSW) {
1831 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1832 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1833 return get(Instruction::Sub, C1, C2, Flags);
1836 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1837 return get(Instruction::FSub, C1, C2);
1840 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1841 bool HasNUW, bool HasNSW) {
1842 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1843 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1844 return get(Instruction::Mul, C1, C2, Flags);
1847 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1848 return get(Instruction::FMul, C1, C2);
1851 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1852 return get(Instruction::UDiv, C1, C2,
1853 isExact ? PossiblyExactOperator::IsExact : 0);
1856 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1857 return get(Instruction::SDiv, C1, C2,
1858 isExact ? PossiblyExactOperator::IsExact : 0);
1861 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1862 return get(Instruction::FDiv, C1, C2);
1865 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1866 return get(Instruction::URem, C1, C2);
1869 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1870 return get(Instruction::SRem, C1, C2);
1873 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1874 return get(Instruction::FRem, C1, C2);
1877 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1878 return get(Instruction::And, C1, C2);
1881 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1882 return get(Instruction::Or, C1, C2);
1885 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1886 return get(Instruction::Xor, C1, C2);
1889 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1890 bool HasNUW, bool HasNSW) {
1891 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1892 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1893 return get(Instruction::Shl, C1, C2, Flags);
1896 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1897 return get(Instruction::LShr, C1, C2,
1898 isExact ? PossiblyExactOperator::IsExact : 0);
1901 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1902 return get(Instruction::AShr, C1, C2,
1903 isExact ? PossiblyExactOperator::IsExact : 0);
1906 // destroyConstant - Remove the constant from the constant table...
1908 void ConstantExpr::destroyConstant() {
1909 getRawType()->getContext().pImpl->ExprConstants.remove(this);
1910 destroyConstantImpl();
1913 const char *ConstantExpr::getOpcodeName() const {
1914 return Instruction::getOpcodeName(getOpcode());
1919 GetElementPtrConstantExpr::
1920 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1922 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1923 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1924 - (IdxList.size()+1), IdxList.size()+1) {
1926 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1927 OperandList[i+1] = IdxList[i];
1931 //===----------------------------------------------------------------------===//
1932 // replaceUsesOfWithOnConstant implementations
1934 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1935 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1938 /// Note that we intentionally replace all uses of From with To here. Consider
1939 /// a large array that uses 'From' 1000 times. By handling this case all here,
1940 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1941 /// single invocation handles all 1000 uses. Handling them one at a time would
1942 /// work, but would be really slow because it would have to unique each updated
1945 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1947 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1948 Constant *ToC = cast<Constant>(To);
1950 LLVMContextImpl *pImpl = getRawType()->getContext().pImpl;
1952 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1953 Lookup.first.first = cast<ArrayType>(getRawType());
1954 Lookup.second = this;
1956 std::vector<Constant*> &Values = Lookup.first.second;
1957 Values.reserve(getNumOperands()); // Build replacement array.
1959 // Fill values with the modified operands of the constant array. Also,
1960 // compute whether this turns into an all-zeros array.
1961 bool isAllZeros = false;
1962 unsigned NumUpdated = 0;
1963 if (!ToC->isNullValue()) {
1964 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1965 Constant *Val = cast<Constant>(O->get());
1970 Values.push_back(Val);
1974 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1975 Constant *Val = cast<Constant>(O->get());
1980 Values.push_back(Val);
1981 if (isAllZeros) isAllZeros = Val->isNullValue();
1985 Constant *Replacement = 0;
1987 Replacement = ConstantAggregateZero::get(getRawType());
1989 // Check to see if we have this array type already.
1991 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1992 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1995 Replacement = I->second;
1997 // Okay, the new shape doesn't exist in the system yet. Instead of
1998 // creating a new constant array, inserting it, replaceallusesof'ing the
1999 // old with the new, then deleting the old... just update the current one
2001 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2003 // Update to the new value. Optimize for the case when we have a single
2004 // operand that we're changing, but handle bulk updates efficiently.
2005 if (NumUpdated == 1) {
2006 unsigned OperandToUpdate = U - OperandList;
2007 assert(getOperand(OperandToUpdate) == From &&
2008 "ReplaceAllUsesWith broken!");
2009 setOperand(OperandToUpdate, ToC);
2011 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2012 if (getOperand(i) == From)
2019 // Otherwise, I do need to replace this with an existing value.
2020 assert(Replacement != this && "I didn't contain From!");
2022 // Everyone using this now uses the replacement.
2023 uncheckedReplaceAllUsesWith(Replacement);
2025 // Delete the old constant!
2029 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2031 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2032 Constant *ToC = cast<Constant>(To);
2034 unsigned OperandToUpdate = U-OperandList;
2035 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2037 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2038 Lookup.first.first = cast<StructType>(getRawType());
2039 Lookup.second = this;
2040 std::vector<Constant*> &Values = Lookup.first.second;
2041 Values.reserve(getNumOperands()); // Build replacement struct.
2044 // Fill values with the modified operands of the constant struct. Also,
2045 // compute whether this turns into an all-zeros struct.
2046 bool isAllZeros = false;
2047 if (!ToC->isNullValue()) {
2048 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2049 Values.push_back(cast<Constant>(O->get()));
2052 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2053 Constant *Val = cast<Constant>(O->get());
2054 Values.push_back(Val);
2055 if (isAllZeros) isAllZeros = Val->isNullValue();
2058 Values[OperandToUpdate] = ToC;
2060 LLVMContextImpl *pImpl = getRawType()->getContext().pImpl;
2062 Constant *Replacement = 0;
2064 Replacement = ConstantAggregateZero::get(getRawType());
2066 // Check to see if we have this struct type already.
2068 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2069 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2072 Replacement = I->second;
2074 // Okay, the new shape doesn't exist in the system yet. Instead of
2075 // creating a new constant struct, inserting it, replaceallusesof'ing the
2076 // old with the new, then deleting the old... just update the current one
2078 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2080 // Update to the new value.
2081 setOperand(OperandToUpdate, ToC);
2086 assert(Replacement != this && "I didn't contain From!");
2088 // Everyone using this now uses the replacement.
2089 uncheckedReplaceAllUsesWith(Replacement);
2091 // Delete the old constant!
2095 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2097 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2099 std::vector<Constant*> Values;
2100 Values.reserve(getNumOperands()); // Build replacement array...
2101 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2102 Constant *Val = getOperand(i);
2103 if (Val == From) Val = cast<Constant>(To);
2104 Values.push_back(Val);
2107 Constant *Replacement = get(Values);
2108 assert(Replacement != this && "I didn't contain From!");
2110 // Everyone using this now uses the replacement.
2111 uncheckedReplaceAllUsesWith(Replacement);
2113 // Delete the old constant!
2117 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2119 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2120 Constant *To = cast<Constant>(ToV);
2122 Constant *Replacement = 0;
2123 if (getOpcode() == Instruction::GetElementPtr) {
2124 SmallVector<Constant*, 8> Indices;
2125 Constant *Pointer = getOperand(0);
2126 Indices.reserve(getNumOperands()-1);
2127 if (Pointer == From) Pointer = To;
2129 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2130 Constant *Val = getOperand(i);
2131 if (Val == From) Val = To;
2132 Indices.push_back(Val);
2134 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2135 &Indices[0], Indices.size(),
2136 cast<GEPOperator>(this)->isInBounds());
2137 } else if (getOpcode() == Instruction::ExtractValue) {
2138 Constant *Agg = getOperand(0);
2139 if (Agg == From) Agg = To;
2141 ArrayRef<unsigned> Indices = getIndices();
2142 Replacement = ConstantExpr::getExtractValue(Agg,
2143 &Indices[0], Indices.size());
2144 } else if (getOpcode() == Instruction::InsertValue) {
2145 Constant *Agg = getOperand(0);
2146 Constant *Val = getOperand(1);
2147 if (Agg == From) Agg = To;
2148 if (Val == From) Val = To;
2150 ArrayRef<unsigned> Indices = getIndices();
2151 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2152 &Indices[0], Indices.size());
2153 } else if (isCast()) {
2154 assert(getOperand(0) == From && "Cast only has one use!");
2155 Replacement = ConstantExpr::getCast(getOpcode(), To, getRawType());
2156 } else if (getOpcode() == Instruction::Select) {
2157 Constant *C1 = getOperand(0);
2158 Constant *C2 = getOperand(1);
2159 Constant *C3 = getOperand(2);
2160 if (C1 == From) C1 = To;
2161 if (C2 == From) C2 = To;
2162 if (C3 == From) C3 = To;
2163 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2164 } else if (getOpcode() == Instruction::ExtractElement) {
2165 Constant *C1 = getOperand(0);
2166 Constant *C2 = getOperand(1);
2167 if (C1 == From) C1 = To;
2168 if (C2 == From) C2 = To;
2169 Replacement = ConstantExpr::getExtractElement(C1, C2);
2170 } else if (getOpcode() == Instruction::InsertElement) {
2171 Constant *C1 = getOperand(0);
2172 Constant *C2 = getOperand(1);
2173 Constant *C3 = getOperand(1);
2174 if (C1 == From) C1 = To;
2175 if (C2 == From) C2 = To;
2176 if (C3 == From) C3 = To;
2177 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2178 } else if (getOpcode() == Instruction::ShuffleVector) {
2179 Constant *C1 = getOperand(0);
2180 Constant *C2 = getOperand(1);
2181 Constant *C3 = getOperand(2);
2182 if (C1 == From) C1 = To;
2183 if (C2 == From) C2 = To;
2184 if (C3 == From) C3 = To;
2185 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2186 } else if (isCompare()) {
2187 Constant *C1 = getOperand(0);
2188 Constant *C2 = getOperand(1);
2189 if (C1 == From) C1 = To;
2190 if (C2 == From) C2 = To;
2191 if (getOpcode() == Instruction::ICmp)
2192 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2194 assert(getOpcode() == Instruction::FCmp);
2195 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2197 } else if (getNumOperands() == 2) {
2198 Constant *C1 = getOperand(0);
2199 Constant *C2 = getOperand(1);
2200 if (C1 == From) C1 = To;
2201 if (C2 == From) C2 = To;
2202 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2204 llvm_unreachable("Unknown ConstantExpr type!");
2208 assert(Replacement != this && "I didn't contain From!");
2210 // Everyone using this now uses the replacement.
2211 uncheckedReplaceAllUsesWith(Replacement);
2213 // Delete the old constant!