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,
575 const std::vector<Constant*> &V) {
576 for (unsigned i = 0, e = V.size(); i != e; ++i) {
577 assert(V[i]->getType() == Ty->getElementType() &&
578 "Wrong type in array element initializer");
580 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
581 // If this is an all-zero array, return a ConstantAggregateZero object
584 if (!C->isNullValue())
585 return pImpl->ArrayConstants.getOrCreate(Ty, V);
587 for (unsigned i = 1, e = V.size(); i != e; ++i)
589 return pImpl->ArrayConstants.getOrCreate(Ty, V);
592 return ConstantAggregateZero::get(Ty);
596 Constant *ConstantArray::get(const ArrayType* T, Constant *const* Vals,
598 // FIXME: make this the primary ctor method.
599 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
602 /// ConstantArray::get(const string&) - Return an array that is initialized to
603 /// contain the specified string. If length is zero then a null terminator is
604 /// added to the specified string so that it may be used in a natural way.
605 /// Otherwise, the length parameter specifies how much of the string to use
606 /// and it won't be null terminated.
608 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
610 std::vector<Constant*> ElementVals;
611 ElementVals.reserve(Str.size() + size_t(AddNull));
612 for (unsigned i = 0; i < Str.size(); ++i)
613 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
615 // Add a null terminator to the string...
617 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
620 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
621 return get(ATy, ElementVals);
624 ConstantStruct::ConstantStruct(const StructType *T,
625 const std::vector<Constant*> &V)
626 : Constant(T, ConstantStructVal,
627 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
629 assert(V.size() == T->getNumElements() &&
630 "Invalid initializer vector for constant structure");
631 Use *OL = OperandList;
632 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
635 assert(C->getType() == T->getElementType(I-V.begin()) &&
636 "Initializer for struct element doesn't match struct element type!");
641 // ConstantStruct accessors.
642 Constant *ConstantStruct::get(const StructType* T,
643 const std::vector<Constant*>& V) {
644 LLVMContextImpl* pImpl = T->getContext().pImpl;
646 // Create a ConstantAggregateZero value if all elements are zeros...
647 for (unsigned i = 0, e = V.size(); i != e; ++i)
648 if (!V[i]->isNullValue())
649 return pImpl->StructConstants.getOrCreate(T, V);
651 return ConstantAggregateZero::get(T);
654 Constant *ConstantStruct::get(LLVMContext &Context,
655 const std::vector<Constant*>& V, bool packed) {
656 std::vector<const Type*> StructEls;
657 StructEls.reserve(V.size());
658 for (unsigned i = 0, e = V.size(); i != e; ++i)
659 StructEls.push_back(V[i]->getType());
660 return get(StructType::get(Context, StructEls, packed), V);
663 Constant *ConstantStruct::get(LLVMContext &Context,
664 Constant *const *Vals, unsigned NumVals,
666 // FIXME: make this the primary ctor method.
667 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
670 Constant* ConstantStruct::get(LLVMContext &Context, bool Packed,
671 Constant * Val, ...) {
673 std::vector<Constant*> Values;
676 Values.push_back(Val);
677 Val = va_arg(ap, llvm::Constant*);
680 return get(Context, Values, Packed);
683 ConstantVector::ConstantVector(const VectorType *T,
684 const std::vector<Constant*> &V)
685 : Constant(T, ConstantVectorVal,
686 OperandTraits<ConstantVector>::op_end(this) - V.size(),
688 Use *OL = OperandList;
689 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
692 assert(C->getType() == T->getElementType() &&
693 "Initializer for vector element doesn't match vector element type!");
698 // ConstantVector accessors.
699 Constant *ConstantVector::get(const VectorType *T,
700 const std::vector<Constant*> &V) {
701 assert(!V.empty() && "Vectors can't be empty");
702 LLVMContextImpl *pImpl = T->getContext().pImpl;
704 // If this is an all-undef or all-zero vector, return a
705 // ConstantAggregateZero or UndefValue.
707 bool isZero = C->isNullValue();
708 bool isUndef = isa<UndefValue>(C);
710 if (isZero || isUndef) {
711 for (unsigned i = 1, e = V.size(); i != e; ++i)
713 isZero = isUndef = false;
719 return ConstantAggregateZero::get(T);
721 return UndefValue::get(T);
723 return pImpl->VectorConstants.getOrCreate(T, V);
726 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
727 // FIXME: make this the primary ctor method.
728 assert(!V.empty() && "Vectors cannot be empty");
729 return get(VectorType::get(V.front()->getType(), V.size()), V.vec());
732 // Utility function for determining if a ConstantExpr is a CastOp or not. This
733 // can't be inline because we don't want to #include Instruction.h into
735 bool ConstantExpr::isCast() const {
736 return Instruction::isCast(getOpcode());
739 bool ConstantExpr::isCompare() const {
740 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
743 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
744 if (getOpcode() != Instruction::GetElementPtr) return false;
746 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
747 User::const_op_iterator OI = llvm::next(this->op_begin());
749 // Skip the first index, as it has no static limit.
753 // The remaining indices must be compile-time known integers within the
754 // bounds of the corresponding notional static array types.
755 for (; GEPI != E; ++GEPI, ++OI) {
756 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
757 if (!CI) return false;
758 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
759 if (CI->getValue().getActiveBits() > 64 ||
760 CI->getZExtValue() >= ATy->getNumElements())
764 // All the indices checked out.
768 bool ConstantExpr::hasIndices() const {
769 return getOpcode() == Instruction::ExtractValue ||
770 getOpcode() == Instruction::InsertValue;
773 ArrayRef<unsigned> ConstantExpr::getIndices() const {
774 if (const ExtractValueConstantExpr *EVCE =
775 dyn_cast<ExtractValueConstantExpr>(this))
776 return EVCE->Indices;
778 return cast<InsertValueConstantExpr>(this)->Indices;
781 unsigned ConstantExpr::getPredicate() const {
782 assert(getOpcode() == Instruction::FCmp ||
783 getOpcode() == Instruction::ICmp);
784 return ((const CompareConstantExpr*)this)->predicate;
787 /// getWithOperandReplaced - Return a constant expression identical to this
788 /// one, but with the specified operand set to the specified value.
790 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
791 assert(OpNo < getNumOperands() && "Operand num is out of range!");
792 assert(Op->getType() == getOperand(OpNo)->getType() &&
793 "Replacing operand with value of different type!");
794 if (getOperand(OpNo) == Op)
795 return const_cast<ConstantExpr*>(this);
797 Constant *Op0, *Op1, *Op2;
798 switch (getOpcode()) {
799 case Instruction::Trunc:
800 case Instruction::ZExt:
801 case Instruction::SExt:
802 case Instruction::FPTrunc:
803 case Instruction::FPExt:
804 case Instruction::UIToFP:
805 case Instruction::SIToFP:
806 case Instruction::FPToUI:
807 case Instruction::FPToSI:
808 case Instruction::PtrToInt:
809 case Instruction::IntToPtr:
810 case Instruction::BitCast:
811 return ConstantExpr::getCast(getOpcode(), Op, getType());
812 case Instruction::Select:
813 Op0 = (OpNo == 0) ? Op : getOperand(0);
814 Op1 = (OpNo == 1) ? Op : getOperand(1);
815 Op2 = (OpNo == 2) ? Op : getOperand(2);
816 return ConstantExpr::getSelect(Op0, Op1, Op2);
817 case Instruction::InsertElement:
818 Op0 = (OpNo == 0) ? Op : getOperand(0);
819 Op1 = (OpNo == 1) ? Op : getOperand(1);
820 Op2 = (OpNo == 2) ? Op : getOperand(2);
821 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
822 case Instruction::ExtractElement:
823 Op0 = (OpNo == 0) ? Op : getOperand(0);
824 Op1 = (OpNo == 1) ? Op : getOperand(1);
825 return ConstantExpr::getExtractElement(Op0, Op1);
826 case Instruction::ShuffleVector:
827 Op0 = (OpNo == 0) ? Op : getOperand(0);
828 Op1 = (OpNo == 1) ? Op : getOperand(1);
829 Op2 = (OpNo == 2) ? Op : getOperand(2);
830 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
831 case Instruction::GetElementPtr: {
832 SmallVector<Constant*, 8> Ops;
833 Ops.resize(getNumOperands()-1);
834 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
835 Ops[i-1] = getOperand(i);
837 return cast<GEPOperator>(this)->isInBounds() ?
838 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
839 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
841 return cast<GEPOperator>(this)->isInBounds() ?
842 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0],Ops.size()):
843 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
846 assert(getNumOperands() == 2 && "Must be binary operator?");
847 Op0 = (OpNo == 0) ? Op : getOperand(0);
848 Op1 = (OpNo == 1) ? Op : getOperand(1);
849 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
853 /// getWithOperands - This returns the current constant expression with the
854 /// operands replaced with the specified values. The specified operands must
855 /// match count and type with the existing ones.
856 Constant *ConstantExpr::
857 getWithOperands(ArrayRef<Constant*> Ops) const {
858 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
859 bool AnyChange = false;
860 for (unsigned i = 0; i != Ops.size(); ++i) {
861 assert(Ops[i]->getType() == getOperand(i)->getType() &&
862 "Operand type mismatch!");
863 AnyChange |= Ops[i] != getOperand(i);
865 if (!AnyChange) // No operands changed, return self.
866 return const_cast<ConstantExpr*>(this);
868 switch (getOpcode()) {
869 case Instruction::Trunc:
870 case Instruction::ZExt:
871 case Instruction::SExt:
872 case Instruction::FPTrunc:
873 case Instruction::FPExt:
874 case Instruction::UIToFP:
875 case Instruction::SIToFP:
876 case Instruction::FPToUI:
877 case Instruction::FPToSI:
878 case Instruction::PtrToInt:
879 case Instruction::IntToPtr:
880 case Instruction::BitCast:
881 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
882 case Instruction::Select:
883 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
884 case Instruction::InsertElement:
885 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
886 case Instruction::ExtractElement:
887 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
888 case Instruction::ShuffleVector:
889 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
890 case Instruction::GetElementPtr:
891 return cast<GEPOperator>(this)->isInBounds() ?
892 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], Ops.size()-1) :
893 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], Ops.size()-1);
894 case Instruction::ICmp:
895 case Instruction::FCmp:
896 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
898 assert(getNumOperands() == 2 && "Must be binary operator?");
899 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
904 //===----------------------------------------------------------------------===//
905 // isValueValidForType implementations
907 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
908 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
909 if (Ty == Type::getInt1Ty(Ty->getContext()))
910 return Val == 0 || Val == 1;
912 return true; // always true, has to fit in largest type
913 uint64_t Max = (1ll << NumBits) - 1;
917 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
918 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
919 if (Ty == Type::getInt1Ty(Ty->getContext()))
920 return Val == 0 || Val == 1 || Val == -1;
922 return true; // always true, has to fit in largest type
923 int64_t Min = -(1ll << (NumBits-1));
924 int64_t Max = (1ll << (NumBits-1)) - 1;
925 return (Val >= Min && Val <= Max);
928 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
929 // convert modifies in place, so make a copy.
930 APFloat Val2 = APFloat(Val);
932 switch (Ty->getTypeID()) {
934 return false; // These can't be represented as floating point!
936 // FIXME rounding mode needs to be more flexible
937 case Type::FloatTyID: {
938 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
940 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
943 case Type::DoubleTyID: {
944 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
945 &Val2.getSemantics() == &APFloat::IEEEdouble)
947 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
950 case Type::X86_FP80TyID:
951 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
952 &Val2.getSemantics() == &APFloat::IEEEdouble ||
953 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
954 case Type::FP128TyID:
955 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
956 &Val2.getSemantics() == &APFloat::IEEEdouble ||
957 &Val2.getSemantics() == &APFloat::IEEEquad;
958 case Type::PPC_FP128TyID:
959 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
960 &Val2.getSemantics() == &APFloat::IEEEdouble ||
961 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
965 //===----------------------------------------------------------------------===//
966 // Factory Function Implementation
968 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
969 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
970 "Cannot create an aggregate zero of non-aggregate type!");
972 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
973 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
976 /// destroyConstant - Remove the constant from the constant table...
978 void ConstantAggregateZero::destroyConstant() {
979 getRawType()->getContext().pImpl->AggZeroConstants.remove(this);
980 destroyConstantImpl();
983 /// destroyConstant - Remove the constant from the constant table...
985 void ConstantArray::destroyConstant() {
986 getRawType()->getContext().pImpl->ArrayConstants.remove(this);
987 destroyConstantImpl();
990 /// isString - This method returns true if the array is an array of i8, and
991 /// if the elements of the array are all ConstantInt's.
992 bool ConstantArray::isString() const {
993 // Check the element type for i8...
994 if (!getType()->getElementType()->isIntegerTy(8))
996 // Check the elements to make sure they are all integers, not constant
998 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
999 if (!isa<ConstantInt>(getOperand(i)))
1004 /// isCString - This method returns true if the array is a string (see
1005 /// isString) and it ends in a null byte \\0 and does not contains any other
1006 /// null bytes except its terminator.
1007 bool ConstantArray::isCString() const {
1008 // Check the element type for i8...
1009 if (!getType()->getElementType()->isIntegerTy(8))
1012 // Last element must be a null.
1013 if (!getOperand(getNumOperands()-1)->isNullValue())
1015 // Other elements must be non-null integers.
1016 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1017 if (!isa<ConstantInt>(getOperand(i)))
1019 if (getOperand(i)->isNullValue())
1026 /// getAsString - If the sub-element type of this array is i8
1027 /// then this method converts the array to an std::string and returns it.
1028 /// Otherwise, it asserts out.
1030 std::string ConstantArray::getAsString() const {
1031 assert(isString() && "Not a string!");
1033 Result.reserve(getNumOperands());
1034 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1035 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
1040 //---- ConstantStruct::get() implementation...
1047 // destroyConstant - Remove the constant from the constant table...
1049 void ConstantStruct::destroyConstant() {
1050 getRawType()->getContext().pImpl->StructConstants.remove(this);
1051 destroyConstantImpl();
1054 // destroyConstant - Remove the constant from the constant table...
1056 void ConstantVector::destroyConstant() {
1057 getRawType()->getContext().pImpl->VectorConstants.remove(this);
1058 destroyConstantImpl();
1061 /// This function will return true iff every element in this vector constant
1062 /// is set to all ones.
1063 /// @returns true iff this constant's emements are all set to all ones.
1064 /// @brief Determine if the value is all ones.
1065 bool ConstantVector::isAllOnesValue() const {
1066 // Check out first element.
1067 const Constant *Elt = getOperand(0);
1068 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
1069 if (!CI || !CI->isAllOnesValue()) return false;
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 false;
1077 /// getSplatValue - If this is a splat constant, where all of the
1078 /// elements have the same value, return that value. Otherwise return null.
1079 Constant *ConstantVector::getSplatValue() const {
1080 // Check out first element.
1081 Constant *Elt = getOperand(0);
1082 // Then make sure all remaining elements point to the same value.
1083 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1084 if (getOperand(I) != Elt) return 0;
1088 //---- ConstantPointerNull::get() implementation.
1091 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1092 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1095 // destroyConstant - Remove the constant from the constant table...
1097 void ConstantPointerNull::destroyConstant() {
1098 getRawType()->getContext().pImpl->NullPtrConstants.remove(this);
1099 destroyConstantImpl();
1103 //---- UndefValue::get() implementation.
1106 UndefValue *UndefValue::get(const Type *Ty) {
1107 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1110 // destroyConstant - Remove the constant from the constant table.
1112 void UndefValue::destroyConstant() {
1113 getRawType()->getContext().pImpl->UndefValueConstants.remove(this);
1114 destroyConstantImpl();
1117 //---- BlockAddress::get() implementation.
1120 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1121 assert(BB->getParent() != 0 && "Block must have a parent");
1122 return get(BB->getParent(), BB);
1125 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1127 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1129 BA = new BlockAddress(F, BB);
1131 assert(BA->getFunction() == F && "Basic block moved between functions");
1135 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1136 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1140 BB->AdjustBlockAddressRefCount(1);
1144 // destroyConstant - Remove the constant from the constant table.
1146 void BlockAddress::destroyConstant() {
1147 getFunction()->getRawType()->getContext().pImpl
1148 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1149 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1150 destroyConstantImpl();
1153 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1154 // This could be replacing either the Basic Block or the Function. In either
1155 // case, we have to remove the map entry.
1156 Function *NewF = getFunction();
1157 BasicBlock *NewBB = getBasicBlock();
1160 NewF = cast<Function>(To);
1162 NewBB = cast<BasicBlock>(To);
1164 // See if the 'new' entry already exists, if not, just update this in place
1165 // and return early.
1166 BlockAddress *&NewBA =
1167 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1169 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1171 // Remove the old entry, this can't cause the map to rehash (just a
1172 // tombstone will get added).
1173 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1176 setOperand(0, NewF);
1177 setOperand(1, NewBB);
1178 getBasicBlock()->AdjustBlockAddressRefCount(1);
1182 // Otherwise, I do need to replace this with an existing value.
1183 assert(NewBA != this && "I didn't contain From!");
1185 // Everyone using this now uses the replacement.
1186 uncheckedReplaceAllUsesWith(NewBA);
1191 //---- ConstantExpr::get() implementations.
1194 /// This is a utility function to handle folding of casts and lookup of the
1195 /// cast in the ExprConstants map. It is used by the various get* methods below.
1196 static inline Constant *getFoldedCast(
1197 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1198 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1199 // Fold a few common cases
1200 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1203 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1205 // Look up the constant in the table first to ensure uniqueness
1206 std::vector<Constant*> argVec(1, C);
1207 ExprMapKeyType Key(opc, argVec);
1209 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1212 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1213 Instruction::CastOps opc = Instruction::CastOps(oc);
1214 assert(Instruction::isCast(opc) && "opcode out of range");
1215 assert(C && Ty && "Null arguments to getCast");
1216 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1220 llvm_unreachable("Invalid cast opcode");
1222 case Instruction::Trunc: return getTrunc(C, Ty);
1223 case Instruction::ZExt: return getZExt(C, Ty);
1224 case Instruction::SExt: return getSExt(C, Ty);
1225 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1226 case Instruction::FPExt: return getFPExtend(C, Ty);
1227 case Instruction::UIToFP: return getUIToFP(C, Ty);
1228 case Instruction::SIToFP: return getSIToFP(C, Ty);
1229 case Instruction::FPToUI: return getFPToUI(C, Ty);
1230 case Instruction::FPToSI: return getFPToSI(C, Ty);
1231 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1232 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1233 case Instruction::BitCast: return getBitCast(C, Ty);
1238 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1239 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1240 return getBitCast(C, Ty);
1241 return getZExt(C, Ty);
1244 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1245 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1246 return getBitCast(C, Ty);
1247 return getSExt(C, Ty);
1250 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1251 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1252 return getBitCast(C, Ty);
1253 return getTrunc(C, Ty);
1256 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1257 assert(S->getType()->isPointerTy() && "Invalid cast");
1258 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1260 if (Ty->isIntegerTy())
1261 return getPtrToInt(S, Ty);
1262 return getBitCast(S, Ty);
1265 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1267 assert(C->getType()->isIntOrIntVectorTy() &&
1268 Ty->isIntOrIntVectorTy() && "Invalid cast");
1269 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1270 unsigned DstBits = Ty->getScalarSizeInBits();
1271 Instruction::CastOps opcode =
1272 (SrcBits == DstBits ? Instruction::BitCast :
1273 (SrcBits > DstBits ? Instruction::Trunc :
1274 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1275 return getCast(opcode, C, Ty);
1278 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1279 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1281 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1282 unsigned DstBits = Ty->getScalarSizeInBits();
1283 if (SrcBits == DstBits)
1284 return C; // Avoid a useless cast
1285 Instruction::CastOps opcode =
1286 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1287 return getCast(opcode, C, Ty);
1290 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1292 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1293 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1295 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1296 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1297 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1298 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1299 "SrcTy must be larger than DestTy for Trunc!");
1301 return getFoldedCast(Instruction::Trunc, C, Ty);
1304 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1306 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1307 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1309 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1310 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1311 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1312 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1313 "SrcTy must be smaller than DestTy for SExt!");
1315 return getFoldedCast(Instruction::SExt, C, Ty);
1318 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1320 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1321 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1323 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1324 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1325 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1326 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1327 "SrcTy must be smaller than DestTy for ZExt!");
1329 return getFoldedCast(Instruction::ZExt, C, Ty);
1332 Constant *ConstantExpr::getFPTrunc(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 truncation!");
1341 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1344 Constant *ConstantExpr::getFPExtend(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()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1351 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1352 "This is an illegal floating point extension!");
1353 return getFoldedCast(Instruction::FPExt, C, Ty);
1356 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1358 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1359 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1361 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1362 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1363 "This is an illegal uint to floating point cast!");
1364 return getFoldedCast(Instruction::UIToFP, C, Ty);
1367 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1369 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1370 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1372 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1373 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1374 "This is an illegal sint to floating point cast!");
1375 return getFoldedCast(Instruction::SIToFP, C, Ty);
1378 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1380 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1381 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1383 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1384 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1385 "This is an illegal floating point to uint cast!");
1386 return getFoldedCast(Instruction::FPToUI, C, Ty);
1389 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1391 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1392 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1394 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1395 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1396 "This is an illegal floating point to sint cast!");
1397 return getFoldedCast(Instruction::FPToSI, C, Ty);
1400 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1401 assert(C->getType()->isPointerTy() && "PtrToInt source must be pointer");
1402 assert(DstTy->isIntegerTy() && "PtrToInt destination must be integral");
1403 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1406 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1407 assert(C->getType()->isIntegerTy() && "IntToPtr source must be integral");
1408 assert(DstTy->isPointerTy() && "IntToPtr destination must be a pointer");
1409 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1412 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1413 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1414 "Invalid constantexpr bitcast!");
1416 // It is common to ask for a bitcast of a value to its own type, handle this
1418 if (C->getType() == DstTy) return C;
1420 return getFoldedCast(Instruction::BitCast, C, DstTy);
1423 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1424 Constant *C1, Constant *C2,
1426 // Check the operands for consistency first
1427 assert(Opcode >= Instruction::BinaryOpsBegin &&
1428 Opcode < Instruction::BinaryOpsEnd &&
1429 "Invalid opcode in binary constant expression");
1430 assert(C1->getType() == C2->getType() &&
1431 "Operand types in binary constant expression should match");
1433 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1434 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1435 return FC; // Fold a few common cases...
1437 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1438 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1440 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1441 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1444 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1445 Constant *C1, Constant *C2) {
1446 switch (predicate) {
1447 default: llvm_unreachable("Invalid CmpInst predicate");
1448 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1449 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1450 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1451 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1452 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1453 case CmpInst::FCMP_TRUE:
1454 return getFCmp(predicate, C1, C2);
1456 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1457 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1458 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1459 case CmpInst::ICMP_SLE:
1460 return getICmp(predicate, C1, C2);
1464 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1468 case Instruction::Add:
1469 case Instruction::Sub:
1470 case Instruction::Mul:
1471 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1472 assert(C1->getType()->isIntOrIntVectorTy() &&
1473 "Tried to create an integer operation on a non-integer type!");
1475 case Instruction::FAdd:
1476 case Instruction::FSub:
1477 case Instruction::FMul:
1478 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1479 assert(C1->getType()->isFPOrFPVectorTy() &&
1480 "Tried to create a floating-point operation on a "
1481 "non-floating-point type!");
1483 case Instruction::UDiv:
1484 case Instruction::SDiv:
1485 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1486 assert(C1->getType()->isIntOrIntVectorTy() &&
1487 "Tried to create an arithmetic operation on a non-arithmetic type!");
1489 case Instruction::FDiv:
1490 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1491 assert(C1->getType()->isFPOrFPVectorTy() &&
1492 "Tried to create an arithmetic operation on a non-arithmetic type!");
1494 case Instruction::URem:
1495 case Instruction::SRem:
1496 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1497 assert(C1->getType()->isIntOrIntVectorTy() &&
1498 "Tried to create an arithmetic operation on a non-arithmetic type!");
1500 case Instruction::FRem:
1501 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1502 assert(C1->getType()->isFPOrFPVectorTy() &&
1503 "Tried to create an arithmetic operation on a non-arithmetic type!");
1505 case Instruction::And:
1506 case Instruction::Or:
1507 case Instruction::Xor:
1508 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1509 assert(C1->getType()->isIntOrIntVectorTy() &&
1510 "Tried to create a logical operation on a non-integral type!");
1512 case Instruction::Shl:
1513 case Instruction::LShr:
1514 case Instruction::AShr:
1515 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1516 assert(C1->getType()->isIntOrIntVectorTy() &&
1517 "Tried to create a shift operation on a non-integer type!");
1524 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1527 Constant *ConstantExpr::getSizeOf(const Type* Ty) {
1528 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1529 // Note that a non-inbounds gep is used, as null isn't within any object.
1530 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1531 Constant *GEP = getGetElementPtr(
1532 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1533 return getPtrToInt(GEP,
1534 Type::getInt64Ty(Ty->getContext()));
1537 Constant *ConstantExpr::getAlignOf(const Type* Ty) {
1538 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1539 // Note that a non-inbounds gep is used, as null isn't within any object.
1540 const Type *AligningTy = StructType::get(Ty->getContext(),
1541 Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1542 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1543 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1544 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1545 Constant *Indices[2] = { Zero, One };
1546 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1547 return getPtrToInt(GEP,
1548 Type::getInt64Ty(Ty->getContext()));
1551 Constant *ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1552 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1556 Constant *ConstantExpr::getOffsetOf(const Type* Ty, Constant *FieldNo) {
1557 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1558 // Note that a non-inbounds gep is used, as null isn't within any object.
1559 Constant *GEPIdx[] = {
1560 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1563 Constant *GEP = getGetElementPtr(
1564 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx, 2);
1565 return getPtrToInt(GEP,
1566 Type::getInt64Ty(Ty->getContext()));
1569 Constant *ConstantExpr::getCompare(unsigned short pred,
1570 Constant *C1, Constant *C2) {
1571 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1572 return getCompareTy(pred, C1, C2);
1575 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1576 Constant *V1, Constant *V2) {
1577 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1579 if (ReqTy == V1->getType())
1580 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1581 return SC; // Fold common cases
1583 std::vector<Constant*> argVec(3, C);
1586 ExprMapKeyType Key(Instruction::Select, argVec);
1588 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1589 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1592 template<typename IndexTy>
1593 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1594 IndexTy const *Idxs,
1595 unsigned NumIdx, bool InBounds) {
1596 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1598 cast<PointerType>(ReqTy)->getElementType() &&
1599 "GEP indices invalid!");
1601 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs, NumIdx))
1602 return FC; // Fold a few common cases.
1604 assert(C->getType()->isPointerTy() &&
1605 "Non-pointer type for constant GetElementPtr expression");
1606 // Look up the constant in the table first to ensure uniqueness
1607 std::vector<Constant*> ArgVec;
1608 ArgVec.reserve(NumIdx+1);
1609 ArgVec.push_back(C);
1610 for (unsigned i = 0; i != NumIdx; ++i)
1611 ArgVec.push_back(cast<Constant>(Idxs[i]));
1612 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1613 InBounds ? GEPOperator::IsInBounds : 0);
1615 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1616 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1619 template<typename IndexTy>
1620 Constant *ConstantExpr::getGetElementPtrImpl(Constant *C, IndexTy const *Idxs,
1621 unsigned NumIdx, bool InBounds) {
1622 // Get the result type of the getelementptr!
1624 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1625 assert(Ty && "GEP indices invalid!");
1626 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1627 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx,InBounds);
1630 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1631 unsigned NumIdx, bool InBounds) {
1632 return getGetElementPtrImpl(C, Idxs, NumIdx, InBounds);
1635 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant *const *Idxs,
1636 unsigned NumIdx, bool InBounds) {
1637 return getGetElementPtrImpl(C, Idxs, NumIdx, InBounds);
1641 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1642 assert(LHS->getType() == RHS->getType());
1643 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1644 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1646 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1647 return FC; // Fold a few common cases...
1649 // Look up the constant in the table first to ensure uniqueness
1650 std::vector<Constant*> ArgVec;
1651 ArgVec.push_back(LHS);
1652 ArgVec.push_back(RHS);
1653 // Get the key type with both the opcode and predicate
1654 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1656 const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1657 if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1658 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1660 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1661 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1665 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1666 assert(LHS->getType() == RHS->getType());
1667 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1669 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1670 return FC; // Fold a few common cases...
1672 // Look up the constant in the table first to ensure uniqueness
1673 std::vector<Constant*> ArgVec;
1674 ArgVec.push_back(LHS);
1675 ArgVec.push_back(RHS);
1676 // Get the key type with both the opcode and predicate
1677 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1679 const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1680 if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1681 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1683 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1684 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1687 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1689 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1690 return FC; // Fold a few common cases.
1691 // Look up the constant in the table first to ensure uniqueness
1692 std::vector<Constant*> ArgVec(1, Val);
1693 ArgVec.push_back(Idx);
1694 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1696 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1697 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1700 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1701 assert(Val->getType()->isVectorTy() &&
1702 "Tried to create extractelement operation on non-vector type!");
1703 assert(Idx->getType()->isIntegerTy(32) &&
1704 "Extractelement index must be i32 type!");
1705 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1709 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1710 Constant *Elt, Constant *Idx) {
1711 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1712 return FC; // Fold a few common cases.
1713 // Look up the constant in the table first to ensure uniqueness
1714 std::vector<Constant*> ArgVec(1, Val);
1715 ArgVec.push_back(Elt);
1716 ArgVec.push_back(Idx);
1717 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1719 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1720 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1723 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1725 assert(Val->getType()->isVectorTy() &&
1726 "Tried to create insertelement operation on non-vector type!");
1727 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1728 && "Insertelement types must match!");
1729 assert(Idx->getType()->isIntegerTy(32) &&
1730 "Insertelement index must be i32 type!");
1731 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1734 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1735 Constant *V2, Constant *Mask) {
1736 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1737 return FC; // Fold a few common cases...
1738 // Look up the constant in the table first to ensure uniqueness
1739 std::vector<Constant*> ArgVec(1, V1);
1740 ArgVec.push_back(V2);
1741 ArgVec.push_back(Mask);
1742 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1744 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1745 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1748 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1750 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1751 "Invalid shuffle vector constant expr operands!");
1753 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1754 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1755 const Type *ShufTy = VectorType::get(EltTy, NElts);
1756 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1759 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1761 const unsigned *Idxs, unsigned NumIdx) {
1762 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1763 Idxs+NumIdx) == Val->getType() &&
1764 "insertvalue indices invalid!");
1765 assert(Agg->getType() == ReqTy &&
1766 "insertvalue type invalid!");
1767 assert(Agg->getType()->isFirstClassType() &&
1768 "Non-first-class type for constant InsertValue expression");
1769 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs, NumIdx);
1770 assert(FC && "InsertValue constant expr couldn't be folded!");
1774 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1775 const unsigned *IdxList, unsigned NumIdx) {
1776 assert(Agg->getType()->isFirstClassType() &&
1777 "Tried to create insertelement operation on non-first-class type!");
1779 const Type *ReqTy = Agg->getType();
1782 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1784 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1785 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1788 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1789 const unsigned *Idxs, unsigned NumIdx) {
1790 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1791 Idxs+NumIdx) == ReqTy &&
1792 "extractvalue indices invalid!");
1793 assert(Agg->getType()->isFirstClassType() &&
1794 "Non-first-class type for constant extractvalue expression");
1795 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs, NumIdx);
1796 assert(FC && "ExtractValue constant expr couldn't be folded!");
1800 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1801 const unsigned *IdxList, unsigned NumIdx) {
1802 assert(Agg->getType()->isFirstClassType() &&
1803 "Tried to create extractelement operation on non-first-class type!");
1806 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1807 assert(ReqTy && "extractvalue indices invalid!");
1808 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1811 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1812 assert(C->getType()->isIntOrIntVectorTy() &&
1813 "Cannot NEG a nonintegral value!");
1814 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1818 Constant *ConstantExpr::getFNeg(Constant *C) {
1819 assert(C->getType()->isFPOrFPVectorTy() &&
1820 "Cannot FNEG a non-floating-point value!");
1821 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1824 Constant *ConstantExpr::getNot(Constant *C) {
1825 assert(C->getType()->isIntOrIntVectorTy() &&
1826 "Cannot NOT a nonintegral value!");
1827 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1830 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1831 bool HasNUW, bool HasNSW) {
1832 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1833 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1834 return get(Instruction::Add, C1, C2, Flags);
1837 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1838 return get(Instruction::FAdd, C1, C2);
1841 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1842 bool HasNUW, bool HasNSW) {
1843 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1844 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1845 return get(Instruction::Sub, C1, C2, Flags);
1848 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1849 return get(Instruction::FSub, C1, C2);
1852 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1853 bool HasNUW, bool HasNSW) {
1854 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1855 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1856 return get(Instruction::Mul, C1, C2, Flags);
1859 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1860 return get(Instruction::FMul, C1, C2);
1863 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1864 return get(Instruction::UDiv, C1, C2,
1865 isExact ? PossiblyExactOperator::IsExact : 0);
1868 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1869 return get(Instruction::SDiv, C1, C2,
1870 isExact ? PossiblyExactOperator::IsExact : 0);
1873 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1874 return get(Instruction::FDiv, C1, C2);
1877 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1878 return get(Instruction::URem, C1, C2);
1881 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1882 return get(Instruction::SRem, C1, C2);
1885 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1886 return get(Instruction::FRem, C1, C2);
1889 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1890 return get(Instruction::And, C1, C2);
1893 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1894 return get(Instruction::Or, C1, C2);
1897 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1898 return get(Instruction::Xor, C1, C2);
1901 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1902 bool HasNUW, bool HasNSW) {
1903 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1904 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1905 return get(Instruction::Shl, C1, C2, Flags);
1908 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1909 return get(Instruction::LShr, C1, C2,
1910 isExact ? PossiblyExactOperator::IsExact : 0);
1913 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1914 return get(Instruction::AShr, C1, C2,
1915 isExact ? PossiblyExactOperator::IsExact : 0);
1918 // destroyConstant - Remove the constant from the constant table...
1920 void ConstantExpr::destroyConstant() {
1921 getRawType()->getContext().pImpl->ExprConstants.remove(this);
1922 destroyConstantImpl();
1925 const char *ConstantExpr::getOpcodeName() const {
1926 return Instruction::getOpcodeName(getOpcode());
1931 GetElementPtrConstantExpr::
1932 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1934 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1935 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1936 - (IdxList.size()+1), IdxList.size()+1) {
1938 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1939 OperandList[i+1] = IdxList[i];
1943 //===----------------------------------------------------------------------===//
1944 // replaceUsesOfWithOnConstant implementations
1946 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1947 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1950 /// Note that we intentionally replace all uses of From with To here. Consider
1951 /// a large array that uses 'From' 1000 times. By handling this case all here,
1952 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1953 /// single invocation handles all 1000 uses. Handling them one at a time would
1954 /// work, but would be really slow because it would have to unique each updated
1957 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1959 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1960 Constant *ToC = cast<Constant>(To);
1962 LLVMContextImpl *pImpl = getRawType()->getContext().pImpl;
1964 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1965 Lookup.first.first = cast<ArrayType>(getRawType());
1966 Lookup.second = this;
1968 std::vector<Constant*> &Values = Lookup.first.second;
1969 Values.reserve(getNumOperands()); // Build replacement array.
1971 // Fill values with the modified operands of the constant array. Also,
1972 // compute whether this turns into an all-zeros array.
1973 bool isAllZeros = false;
1974 unsigned NumUpdated = 0;
1975 if (!ToC->isNullValue()) {
1976 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1977 Constant *Val = cast<Constant>(O->get());
1982 Values.push_back(Val);
1986 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1987 Constant *Val = cast<Constant>(O->get());
1992 Values.push_back(Val);
1993 if (isAllZeros) isAllZeros = Val->isNullValue();
1997 Constant *Replacement = 0;
1999 Replacement = ConstantAggregateZero::get(getRawType());
2001 // Check to see if we have this array type already.
2003 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2004 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2007 Replacement = I->second;
2009 // Okay, the new shape doesn't exist in the system yet. Instead of
2010 // creating a new constant array, inserting it, replaceallusesof'ing the
2011 // old with the new, then deleting the old... just update the current one
2013 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2015 // Update to the new value. Optimize for the case when we have a single
2016 // operand that we're changing, but handle bulk updates efficiently.
2017 if (NumUpdated == 1) {
2018 unsigned OperandToUpdate = U - OperandList;
2019 assert(getOperand(OperandToUpdate) == From &&
2020 "ReplaceAllUsesWith broken!");
2021 setOperand(OperandToUpdate, ToC);
2023 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2024 if (getOperand(i) == From)
2031 // Otherwise, I do need to replace this with an existing value.
2032 assert(Replacement != this && "I didn't contain From!");
2034 // Everyone using this now uses the replacement.
2035 uncheckedReplaceAllUsesWith(Replacement);
2037 // Delete the old constant!
2041 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2043 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2044 Constant *ToC = cast<Constant>(To);
2046 unsigned OperandToUpdate = U-OperandList;
2047 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2049 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2050 Lookup.first.first = cast<StructType>(getRawType());
2051 Lookup.second = this;
2052 std::vector<Constant*> &Values = Lookup.first.second;
2053 Values.reserve(getNumOperands()); // Build replacement struct.
2056 // Fill values with the modified operands of the constant struct. Also,
2057 // compute whether this turns into an all-zeros struct.
2058 bool isAllZeros = false;
2059 if (!ToC->isNullValue()) {
2060 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2061 Values.push_back(cast<Constant>(O->get()));
2064 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2065 Constant *Val = cast<Constant>(O->get());
2066 Values.push_back(Val);
2067 if (isAllZeros) isAllZeros = Val->isNullValue();
2070 Values[OperandToUpdate] = ToC;
2072 LLVMContextImpl *pImpl = getRawType()->getContext().pImpl;
2074 Constant *Replacement = 0;
2076 Replacement = ConstantAggregateZero::get(getRawType());
2078 // Check to see if we have this struct type already.
2080 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2081 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2084 Replacement = I->second;
2086 // Okay, the new shape doesn't exist in the system yet. Instead of
2087 // creating a new constant struct, inserting it, replaceallusesof'ing the
2088 // old with the new, then deleting the old... just update the current one
2090 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2092 // Update to the new value.
2093 setOperand(OperandToUpdate, ToC);
2098 assert(Replacement != this && "I didn't contain From!");
2100 // Everyone using this now uses the replacement.
2101 uncheckedReplaceAllUsesWith(Replacement);
2103 // Delete the old constant!
2107 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2109 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2111 std::vector<Constant*> Values;
2112 Values.reserve(getNumOperands()); // Build replacement array...
2113 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2114 Constant *Val = getOperand(i);
2115 if (Val == From) Val = cast<Constant>(To);
2116 Values.push_back(Val);
2119 Constant *Replacement = get(cast<VectorType>(getRawType()), Values);
2120 assert(Replacement != this && "I didn't contain From!");
2122 // Everyone using this now uses the replacement.
2123 uncheckedReplaceAllUsesWith(Replacement);
2125 // Delete the old constant!
2129 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2131 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2132 Constant *To = cast<Constant>(ToV);
2134 Constant *Replacement = 0;
2135 if (getOpcode() == Instruction::GetElementPtr) {
2136 SmallVector<Constant*, 8> Indices;
2137 Constant *Pointer = getOperand(0);
2138 Indices.reserve(getNumOperands()-1);
2139 if (Pointer == From) Pointer = To;
2141 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2142 Constant *Val = getOperand(i);
2143 if (Val == From) Val = To;
2144 Indices.push_back(Val);
2146 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2147 &Indices[0], Indices.size(),
2148 cast<GEPOperator>(this)->isInBounds());
2149 } else if (getOpcode() == Instruction::ExtractValue) {
2150 Constant *Agg = getOperand(0);
2151 if (Agg == From) Agg = To;
2153 ArrayRef<unsigned> Indices = getIndices();
2154 Replacement = ConstantExpr::getExtractValue(Agg,
2155 &Indices[0], Indices.size());
2156 } else if (getOpcode() == Instruction::InsertValue) {
2157 Constant *Agg = getOperand(0);
2158 Constant *Val = getOperand(1);
2159 if (Agg == From) Agg = To;
2160 if (Val == From) Val = To;
2162 ArrayRef<unsigned> Indices = getIndices();
2163 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2164 &Indices[0], Indices.size());
2165 } else if (isCast()) {
2166 assert(getOperand(0) == From && "Cast only has one use!");
2167 Replacement = ConstantExpr::getCast(getOpcode(), To, getRawType());
2168 } else if (getOpcode() == Instruction::Select) {
2169 Constant *C1 = getOperand(0);
2170 Constant *C2 = getOperand(1);
2171 Constant *C3 = getOperand(2);
2172 if (C1 == From) C1 = To;
2173 if (C2 == From) C2 = To;
2174 if (C3 == From) C3 = To;
2175 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2176 } else if (getOpcode() == Instruction::ExtractElement) {
2177 Constant *C1 = getOperand(0);
2178 Constant *C2 = getOperand(1);
2179 if (C1 == From) C1 = To;
2180 if (C2 == From) C2 = To;
2181 Replacement = ConstantExpr::getExtractElement(C1, C2);
2182 } else if (getOpcode() == Instruction::InsertElement) {
2183 Constant *C1 = getOperand(0);
2184 Constant *C2 = getOperand(1);
2185 Constant *C3 = getOperand(1);
2186 if (C1 == From) C1 = To;
2187 if (C2 == From) C2 = To;
2188 if (C3 == From) C3 = To;
2189 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2190 } else if (getOpcode() == Instruction::ShuffleVector) {
2191 Constant *C1 = getOperand(0);
2192 Constant *C2 = getOperand(1);
2193 Constant *C3 = getOperand(2);
2194 if (C1 == From) C1 = To;
2195 if (C2 == From) C2 = To;
2196 if (C3 == From) C3 = To;
2197 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2198 } else if (isCompare()) {
2199 Constant *C1 = getOperand(0);
2200 Constant *C2 = getOperand(1);
2201 if (C1 == From) C1 = To;
2202 if (C2 == From) C2 = To;
2203 if (getOpcode() == Instruction::ICmp)
2204 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2206 assert(getOpcode() == Instruction::FCmp);
2207 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2209 } else if (getNumOperands() == 2) {
2210 Constant *C1 = getOperand(0);
2211 Constant *C2 = getOperand(1);
2212 if (C1 == From) C1 = To;
2213 if (C2 == From) C2 = To;
2214 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2216 llvm_unreachable("Unknown ConstantExpr type!");
2220 assert(Replacement != this && "I didn't contain From!");
2222 // Everyone using this now uses the replacement.
2223 uncheckedReplaceAllUsesWith(Replacement);
2225 // Delete the old constant!