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"
34 #include "llvm/ADT/STLExtras.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Otherwise, just use +0.0.
54 bool Constant::isNullValue() const {
56 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
60 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
61 return CFP->isZero() && !CFP->isNegative();
63 // constant zero is zero for aggregates and cpnull is null for pointers.
64 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
67 bool Constant::isAllOnesValue() const {
68 // Check for -1 integers
69 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
70 return CI->isMinusOne();
72 // Check for FP which are bitcasted from -1 integers
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
74 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
76 // Check for constant vectors which are splats of -1 values.
77 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
78 if (Constant *Splat = CV->getSplatValue())
79 return Splat->isAllOnesValue();
84 // Constructor to create a '0' constant of arbitrary type...
85 Constant *Constant::getNullValue(Type *Ty) {
86 switch (Ty->getTypeID()) {
87 case Type::IntegerTyID:
88 return ConstantInt::get(Ty, 0);
90 return ConstantFP::get(Ty->getContext(),
91 APFloat::getZero(APFloat::IEEEhalf));
93 return ConstantFP::get(Ty->getContext(),
94 APFloat::getZero(APFloat::IEEEsingle));
95 case Type::DoubleTyID:
96 return ConstantFP::get(Ty->getContext(),
97 APFloat::getZero(APFloat::IEEEdouble));
98 case Type::X86_FP80TyID:
99 return ConstantFP::get(Ty->getContext(),
100 APFloat::getZero(APFloat::x87DoubleExtended));
101 case Type::FP128TyID:
102 return ConstantFP::get(Ty->getContext(),
103 APFloat::getZero(APFloat::IEEEquad));
104 case Type::PPC_FP128TyID:
105 return ConstantFP::get(Ty->getContext(),
106 APFloat(APInt::getNullValue(128)));
107 case Type::PointerTyID:
108 return ConstantPointerNull::get(cast<PointerType>(Ty));
109 case Type::StructTyID:
110 case Type::ArrayTyID:
111 case Type::VectorTyID:
112 return ConstantAggregateZero::get(Ty);
114 // Function, Label, or Opaque type?
115 assert(0 && "Cannot create a null constant of that type!");
120 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
121 Type *ScalarTy = Ty->getScalarType();
123 // Create the base integer constant.
124 Constant *C = ConstantInt::get(Ty->getContext(), V);
126 // Convert an integer to a pointer, if necessary.
127 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
128 C = ConstantExpr::getIntToPtr(C, PTy);
130 // Broadcast a scalar to a vector, if necessary.
131 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
132 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
137 Constant *Constant::getAllOnesValue(Type *Ty) {
138 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
139 return ConstantInt::get(Ty->getContext(),
140 APInt::getAllOnesValue(ITy->getBitWidth()));
142 if (Ty->isFloatingPointTy()) {
143 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
144 !Ty->isPPC_FP128Ty());
145 return ConstantFP::get(Ty->getContext(), FL);
148 SmallVector<Constant*, 16> Elts;
149 VectorType *VTy = cast<VectorType>(Ty);
150 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
151 assert(Elts[0] && "Invalid AllOnes value!");
152 return cast<ConstantVector>(ConstantVector::get(Elts));
155 void Constant::destroyConstantImpl() {
156 // When a Constant is destroyed, there may be lingering
157 // references to the constant by other constants in the constant pool. These
158 // constants are implicitly dependent on the module that is being deleted,
159 // but they don't know that. Because we only find out when the CPV is
160 // deleted, we must now notify all of our users (that should only be
161 // Constants) that they are, in fact, invalid now and should be deleted.
163 while (!use_empty()) {
164 Value *V = use_back();
165 #ifndef NDEBUG // Only in -g mode...
166 if (!isa<Constant>(V)) {
167 dbgs() << "While deleting: " << *this
168 << "\n\nUse still stuck around after Def is destroyed: "
172 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
173 Constant *CV = cast<Constant>(V);
174 CV->destroyConstant();
176 // The constant should remove itself from our use list...
177 assert((use_empty() || use_back() != V) && "Constant not removed!");
180 // Value has no outstanding references it is safe to delete it now...
184 /// canTrap - Return true if evaluation of this constant could trap. This is
185 /// true for things like constant expressions that could divide by zero.
186 bool Constant::canTrap() const {
187 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
188 // The only thing that could possibly trap are constant exprs.
189 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
190 if (!CE) return false;
192 // ConstantExpr traps if any operands can trap.
193 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
194 if (CE->getOperand(i)->canTrap())
197 // Otherwise, only specific operations can trap.
198 switch (CE->getOpcode()) {
201 case Instruction::UDiv:
202 case Instruction::SDiv:
203 case Instruction::FDiv:
204 case Instruction::URem:
205 case Instruction::SRem:
206 case Instruction::FRem:
207 // Div and rem can trap if the RHS is not known to be non-zero.
208 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
214 /// isConstantUsed - Return true if the constant has users other than constant
215 /// exprs and other dangling things.
216 bool Constant::isConstantUsed() const {
217 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
218 const Constant *UC = dyn_cast<Constant>(*UI);
219 if (UC == 0 || isa<GlobalValue>(UC))
222 if (UC->isConstantUsed())
230 /// getRelocationInfo - This method classifies the entry according to
231 /// whether or not it may generate a relocation entry. This must be
232 /// conservative, so if it might codegen to a relocatable entry, it should say
233 /// so. The return values are:
235 /// NoRelocation: This constant pool entry is guaranteed to never have a
236 /// relocation applied to it (because it holds a simple constant like
238 /// LocalRelocation: This entry has relocations, but the entries are
239 /// guaranteed to be resolvable by the static linker, so the dynamic
240 /// linker will never see them.
241 /// GlobalRelocations: This entry may have arbitrary relocations.
243 /// FIXME: This really should not be in VMCore.
244 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
245 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
246 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
247 return LocalRelocation; // Local to this file/library.
248 return GlobalRelocations; // Global reference.
251 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
252 return BA->getFunction()->getRelocationInfo();
254 // While raw uses of blockaddress need to be relocated, differences between
255 // two of them don't when they are for labels in the same function. This is a
256 // common idiom when creating a table for the indirect goto extension, so we
257 // handle it efficiently here.
258 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
259 if (CE->getOpcode() == Instruction::Sub) {
260 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
261 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
263 LHS->getOpcode() == Instruction::PtrToInt &&
264 RHS->getOpcode() == Instruction::PtrToInt &&
265 isa<BlockAddress>(LHS->getOperand(0)) &&
266 isa<BlockAddress>(RHS->getOperand(0)) &&
267 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
268 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
272 PossibleRelocationsTy Result = NoRelocation;
273 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
274 Result = std::max(Result,
275 cast<Constant>(getOperand(i))->getRelocationInfo());
281 /// getVectorElements - This method, which is only valid on constant of vector
282 /// type, returns the elements of the vector in the specified smallvector.
283 /// This handles breaking down a vector undef into undef elements, etc. For
284 /// constant exprs and other cases we can't handle, we return an empty vector.
285 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
286 assert(getType()->isVectorTy() && "Not a vector constant!");
288 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
289 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
290 Elts.push_back(CV->getOperand(i));
294 VectorType *VT = cast<VectorType>(getType());
295 if (isa<ConstantAggregateZero>(this)) {
296 Elts.assign(VT->getNumElements(),
297 Constant::getNullValue(VT->getElementType()));
301 if (isa<UndefValue>(this)) {
302 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
306 // Unknown type, must be constant expr etc.
310 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
311 /// it. This involves recursively eliminating any dead users of the
313 static bool removeDeadUsersOfConstant(const Constant *C) {
314 if (isa<GlobalValue>(C)) return false; // Cannot remove this
316 while (!C->use_empty()) {
317 const Constant *User = dyn_cast<Constant>(C->use_back());
318 if (!User) return false; // Non-constant usage;
319 if (!removeDeadUsersOfConstant(User))
320 return false; // Constant wasn't dead
323 const_cast<Constant*>(C)->destroyConstant();
328 /// removeDeadConstantUsers - If there are any dead constant users dangling
329 /// off of this constant, remove them. This method is useful for clients
330 /// that want to check to see if a global is unused, but don't want to deal
331 /// with potentially dead constants hanging off of the globals.
332 void Constant::removeDeadConstantUsers() const {
333 Value::const_use_iterator I = use_begin(), E = use_end();
334 Value::const_use_iterator LastNonDeadUser = E;
336 const Constant *User = dyn_cast<Constant>(*I);
343 if (!removeDeadUsersOfConstant(User)) {
344 // If the constant wasn't dead, remember that this was the last live use
345 // and move on to the next constant.
351 // If the constant was dead, then the iterator is invalidated.
352 if (LastNonDeadUser == E) {
364 //===----------------------------------------------------------------------===//
366 //===----------------------------------------------------------------------===//
368 void ConstantInt::anchor() { }
370 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
371 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
372 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
375 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
376 LLVMContextImpl *pImpl = Context.pImpl;
377 if (!pImpl->TheTrueVal)
378 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
379 return pImpl->TheTrueVal;
382 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
383 LLVMContextImpl *pImpl = Context.pImpl;
384 if (!pImpl->TheFalseVal)
385 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
386 return pImpl->TheFalseVal;
389 Constant *ConstantInt::getTrue(Type *Ty) {
390 VectorType *VTy = dyn_cast<VectorType>(Ty);
392 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
393 return ConstantInt::getTrue(Ty->getContext());
395 assert(VTy->getElementType()->isIntegerTy(1) &&
396 "True must be vector of i1 or i1.");
397 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
398 ConstantInt::getTrue(Ty->getContext()));
399 return ConstantVector::get(Splat);
402 Constant *ConstantInt::getFalse(Type *Ty) {
403 VectorType *VTy = dyn_cast<VectorType>(Ty);
405 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
406 return ConstantInt::getFalse(Ty->getContext());
408 assert(VTy->getElementType()->isIntegerTy(1) &&
409 "False must be vector of i1 or i1.");
410 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
411 ConstantInt::getFalse(Ty->getContext()));
412 return ConstantVector::get(Splat);
416 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
417 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
418 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
419 // compare APInt's of different widths, which would violate an APInt class
420 // invariant which generates an assertion.
421 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
422 // Get the corresponding integer type for the bit width of the value.
423 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
424 // get an existing value or the insertion position
425 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
426 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
427 if (!Slot) Slot = new ConstantInt(ITy, V);
431 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
432 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
434 // For vectors, broadcast the value.
435 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
436 return ConstantVector::get(SmallVector<Constant*,
437 16>(VTy->getNumElements(), C));
442 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
444 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
447 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
448 return get(Ty, V, true);
451 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
452 return get(Ty, V, true);
455 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
456 ConstantInt *C = get(Ty->getContext(), V);
457 assert(C->getType() == Ty->getScalarType() &&
458 "ConstantInt type doesn't match the type implied by its value!");
460 // For vectors, broadcast the value.
461 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
462 return ConstantVector::get(
463 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
468 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
470 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
473 //===----------------------------------------------------------------------===//
475 //===----------------------------------------------------------------------===//
477 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
479 return &APFloat::IEEEhalf;
481 return &APFloat::IEEEsingle;
482 if (Ty->isDoubleTy())
483 return &APFloat::IEEEdouble;
484 if (Ty->isX86_FP80Ty())
485 return &APFloat::x87DoubleExtended;
486 else if (Ty->isFP128Ty())
487 return &APFloat::IEEEquad;
489 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
490 return &APFloat::PPCDoubleDouble;
493 void ConstantFP::anchor() { }
495 /// get() - This returns a constant fp for the specified value in the
496 /// specified type. This should only be used for simple constant values like
497 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
498 Constant *ConstantFP::get(Type* Ty, double V) {
499 LLVMContext &Context = Ty->getContext();
503 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
504 APFloat::rmNearestTiesToEven, &ignored);
505 Constant *C = get(Context, FV);
507 // For vectors, broadcast the value.
508 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
509 return ConstantVector::get(
510 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
516 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
517 LLVMContext &Context = Ty->getContext();
519 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
520 Constant *C = get(Context, FV);
522 // For vectors, broadcast the value.
523 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
524 return ConstantVector::get(
525 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
531 ConstantFP* ConstantFP::getNegativeZero(Type* Ty) {
532 LLVMContext &Context = Ty->getContext();
533 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
535 return get(Context, apf);
539 Constant *ConstantFP::getZeroValueForNegation(Type* Ty) {
540 if (VectorType *PTy = dyn_cast<VectorType>(Ty))
541 if (PTy->getElementType()->isFloatingPointTy()) {
542 SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
543 getNegativeZero(PTy->getElementType()));
544 return ConstantVector::get(zeros);
547 if (Ty->isFloatingPointTy())
548 return getNegativeZero(Ty);
550 return Constant::getNullValue(Ty);
554 // ConstantFP accessors.
555 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
556 DenseMapAPFloatKeyInfo::KeyTy Key(V);
558 LLVMContextImpl* pImpl = Context.pImpl;
560 ConstantFP *&Slot = pImpl->FPConstants[Key];
564 if (&V.getSemantics() == &APFloat::IEEEhalf)
565 Ty = Type::getHalfTy(Context);
566 else if (&V.getSemantics() == &APFloat::IEEEsingle)
567 Ty = Type::getFloatTy(Context);
568 else if (&V.getSemantics() == &APFloat::IEEEdouble)
569 Ty = Type::getDoubleTy(Context);
570 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
571 Ty = Type::getX86_FP80Ty(Context);
572 else if (&V.getSemantics() == &APFloat::IEEEquad)
573 Ty = Type::getFP128Ty(Context);
575 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
576 "Unknown FP format");
577 Ty = Type::getPPC_FP128Ty(Context);
579 Slot = new ConstantFP(Ty, V);
585 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
586 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
587 return ConstantFP::get(Ty->getContext(),
588 APFloat::getInf(Semantics, Negative));
591 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
592 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
593 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
597 bool ConstantFP::isExactlyValue(const APFloat &V) const {
598 return Val.bitwiseIsEqual(V);
601 //===----------------------------------------------------------------------===//
602 // ConstantAggregateZero Implementation
603 //===----------------------------------------------------------------------===//
605 /// getSequentialElement - If this CAZ has array or vector type, return a zero
606 /// with the right element type.
607 Constant *ConstantAggregateZero::getSequentialElement() {
608 return Constant::getNullValue(
609 cast<SequentialType>(getType())->getElementType());
612 /// getStructElement - If this CAZ has struct type, return a zero with the
613 /// right element type for the specified element.
614 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) {
615 return Constant::getNullValue(
616 cast<StructType>(getType())->getElementType(Elt));
619 /// getElementValue - Return a zero of the right value for the specified GEP
620 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
621 Constant *ConstantAggregateZero::getElementValue(Constant *C) {
622 if (isa<SequentialType>(getType()))
623 return getSequentialElement();
624 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
627 //===----------------------------------------------------------------------===//
628 // UndefValue Implementation
629 //===----------------------------------------------------------------------===//
631 /// getSequentialElement - If this undef has array or vector type, return an
632 /// undef with the right element type.
633 UndefValue *UndefValue::getSequentialElement() {
634 return UndefValue::get(cast<SequentialType>(getType())->getElementType());
637 /// getStructElement - If this undef has struct type, return a zero with the
638 /// right element type for the specified element.
639 UndefValue *UndefValue::getStructElement(unsigned Elt) {
640 return UndefValue::get(cast<StructType>(getType())->getElementType(Elt));
643 /// getElementValue - Return an undef of the right value for the specified GEP
644 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
645 UndefValue *UndefValue::getElementValue(Constant *C) {
646 if (isa<SequentialType>(getType()))
647 return getSequentialElement();
648 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
652 //===----------------------------------------------------------------------===//
653 // ConstantXXX Classes
654 //===----------------------------------------------------------------------===//
657 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
658 : Constant(T, ConstantArrayVal,
659 OperandTraits<ConstantArray>::op_end(this) - V.size(),
661 assert(V.size() == T->getNumElements() &&
662 "Invalid initializer vector for constant array");
663 for (unsigned i = 0, e = V.size(); i != e; ++i)
664 assert(V[i]->getType() == T->getElementType() &&
665 "Initializer for array element doesn't match array element type!");
666 std::copy(V.begin(), V.end(), op_begin());
669 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
670 for (unsigned i = 0, e = V.size(); i != e; ++i) {
671 assert(V[i]->getType() == Ty->getElementType() &&
672 "Wrong type in array element initializer");
674 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
675 // If this is an all-zero array, return a ConstantAggregateZero object
678 if (!C->isNullValue())
679 return pImpl->ArrayConstants.getOrCreate(Ty, V);
681 for (unsigned i = 1, e = V.size(); i != e; ++i)
683 return pImpl->ArrayConstants.getOrCreate(Ty, V);
686 return ConstantAggregateZero::get(Ty);
689 /// ConstantArray::get(const string&) - Return an array that is initialized to
690 /// contain the specified string. If length is zero then a null terminator is
691 /// added to the specified string so that it may be used in a natural way.
692 /// Otherwise, the length parameter specifies how much of the string to use
693 /// and it won't be null terminated.
695 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
697 std::vector<Constant*> ElementVals;
698 ElementVals.reserve(Str.size() + size_t(AddNull));
699 for (unsigned i = 0; i < Str.size(); ++i)
700 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
702 // Add a null terminator to the string...
704 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
707 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
708 return get(ATy, ElementVals);
711 /// getTypeForElements - Return an anonymous struct type to use for a constant
712 /// with the specified set of elements. The list must not be empty.
713 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
714 ArrayRef<Constant*> V,
716 SmallVector<Type*, 16> EltTypes;
717 for (unsigned i = 0, e = V.size(); i != e; ++i)
718 EltTypes.push_back(V[i]->getType());
720 return StructType::get(Context, EltTypes, Packed);
724 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
727 "ConstantStruct::getTypeForElements cannot be called on empty list");
728 return getTypeForElements(V[0]->getContext(), V, Packed);
732 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
733 : Constant(T, ConstantStructVal,
734 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
736 assert(V.size() == T->getNumElements() &&
737 "Invalid initializer vector for constant structure");
738 for (unsigned i = 0, e = V.size(); i != e; ++i)
739 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
740 "Initializer for struct element doesn't match struct element type!");
741 std::copy(V.begin(), V.end(), op_begin());
744 // ConstantStruct accessors.
745 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
746 // Create a ConstantAggregateZero value if all elements are zeros.
747 for (unsigned i = 0, e = V.size(); i != e; ++i)
748 if (!V[i]->isNullValue())
749 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
751 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
752 "Incorrect # elements specified to ConstantStruct::get");
753 return ConstantAggregateZero::get(ST);
756 Constant *ConstantStruct::get(StructType *T, ...) {
758 SmallVector<Constant*, 8> Values;
760 while (Constant *Val = va_arg(ap, llvm::Constant*))
761 Values.push_back(Val);
763 return get(T, Values);
766 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
767 : Constant(T, ConstantVectorVal,
768 OperandTraits<ConstantVector>::op_end(this) - V.size(),
770 for (size_t i = 0, e = V.size(); i != e; i++)
771 assert(V[i]->getType() == T->getElementType() &&
772 "Initializer for vector element doesn't match vector element type!");
773 std::copy(V.begin(), V.end(), op_begin());
776 // ConstantVector accessors.
777 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
778 assert(!V.empty() && "Vectors can't be empty");
779 VectorType *T = VectorType::get(V.front()->getType(), V.size());
780 LLVMContextImpl *pImpl = T->getContext().pImpl;
782 // If this is an all-undef or all-zero vector, return a
783 // ConstantAggregateZero or UndefValue.
785 bool isZero = C->isNullValue();
786 bool isUndef = isa<UndefValue>(C);
788 if (isZero || isUndef) {
789 for (unsigned i = 1, e = V.size(); i != e; ++i)
791 isZero = isUndef = false;
797 return ConstantAggregateZero::get(T);
799 return UndefValue::get(T);
801 return pImpl->VectorConstants.getOrCreate(T, V);
804 // Utility function for determining if a ConstantExpr is a CastOp or not. This
805 // can't be inline because we don't want to #include Instruction.h into
807 bool ConstantExpr::isCast() const {
808 return Instruction::isCast(getOpcode());
811 bool ConstantExpr::isCompare() const {
812 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
815 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
816 if (getOpcode() != Instruction::GetElementPtr) return false;
818 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
819 User::const_op_iterator OI = llvm::next(this->op_begin());
821 // Skip the first index, as it has no static limit.
825 // The remaining indices must be compile-time known integers within the
826 // bounds of the corresponding notional static array types.
827 for (; GEPI != E; ++GEPI, ++OI) {
828 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
829 if (!CI) return false;
830 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
831 if (CI->getValue().getActiveBits() > 64 ||
832 CI->getZExtValue() >= ATy->getNumElements())
836 // All the indices checked out.
840 bool ConstantExpr::hasIndices() const {
841 return getOpcode() == Instruction::ExtractValue ||
842 getOpcode() == Instruction::InsertValue;
845 ArrayRef<unsigned> ConstantExpr::getIndices() const {
846 if (const ExtractValueConstantExpr *EVCE =
847 dyn_cast<ExtractValueConstantExpr>(this))
848 return EVCE->Indices;
850 return cast<InsertValueConstantExpr>(this)->Indices;
853 unsigned ConstantExpr::getPredicate() const {
855 return ((const CompareConstantExpr*)this)->predicate;
858 /// getWithOperandReplaced - Return a constant expression identical to this
859 /// one, but with the specified operand set to the specified value.
861 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
862 assert(OpNo < getNumOperands() && "Operand num is out of range!");
863 assert(Op->getType() == getOperand(OpNo)->getType() &&
864 "Replacing operand with value of different type!");
865 if (getOperand(OpNo) == Op)
866 return const_cast<ConstantExpr*>(this);
868 Constant *Op0, *Op1, *Op2;
869 switch (getOpcode()) {
870 case Instruction::Trunc:
871 case Instruction::ZExt:
872 case Instruction::SExt:
873 case Instruction::FPTrunc:
874 case Instruction::FPExt:
875 case Instruction::UIToFP:
876 case Instruction::SIToFP:
877 case Instruction::FPToUI:
878 case Instruction::FPToSI:
879 case Instruction::PtrToInt:
880 case Instruction::IntToPtr:
881 case Instruction::BitCast:
882 return ConstantExpr::getCast(getOpcode(), Op, getType());
883 case Instruction::Select:
884 Op0 = (OpNo == 0) ? Op : getOperand(0);
885 Op1 = (OpNo == 1) ? Op : getOperand(1);
886 Op2 = (OpNo == 2) ? Op : getOperand(2);
887 return ConstantExpr::getSelect(Op0, Op1, Op2);
888 case Instruction::InsertElement:
889 Op0 = (OpNo == 0) ? Op : getOperand(0);
890 Op1 = (OpNo == 1) ? Op : getOperand(1);
891 Op2 = (OpNo == 2) ? Op : getOperand(2);
892 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
893 case Instruction::ExtractElement:
894 Op0 = (OpNo == 0) ? Op : getOperand(0);
895 Op1 = (OpNo == 1) ? Op : getOperand(1);
896 return ConstantExpr::getExtractElement(Op0, Op1);
897 case Instruction::ShuffleVector:
898 Op0 = (OpNo == 0) ? Op : getOperand(0);
899 Op1 = (OpNo == 1) ? Op : getOperand(1);
900 Op2 = (OpNo == 2) ? Op : getOperand(2);
901 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
902 case Instruction::GetElementPtr: {
903 SmallVector<Constant*, 8> Ops;
904 Ops.resize(getNumOperands()-1);
905 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
906 Ops[i-1] = getOperand(i);
909 ConstantExpr::getGetElementPtr(Op, Ops,
910 cast<GEPOperator>(this)->isInBounds());
913 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
914 cast<GEPOperator>(this)->isInBounds());
917 assert(getNumOperands() == 2 && "Must be binary operator?");
918 Op0 = (OpNo == 0) ? Op : getOperand(0);
919 Op1 = (OpNo == 1) ? Op : getOperand(1);
920 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
924 /// getWithOperands - This returns the current constant expression with the
925 /// operands replaced with the specified values. The specified array must
926 /// have the same number of operands as our current one.
927 Constant *ConstantExpr::
928 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
929 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
930 bool AnyChange = Ty != getType();
931 for (unsigned i = 0; i != Ops.size(); ++i)
932 AnyChange |= Ops[i] != getOperand(i);
934 if (!AnyChange) // No operands changed, return self.
935 return const_cast<ConstantExpr*>(this);
937 switch (getOpcode()) {
938 case Instruction::Trunc:
939 case Instruction::ZExt:
940 case Instruction::SExt:
941 case Instruction::FPTrunc:
942 case Instruction::FPExt:
943 case Instruction::UIToFP:
944 case Instruction::SIToFP:
945 case Instruction::FPToUI:
946 case Instruction::FPToSI:
947 case Instruction::PtrToInt:
948 case Instruction::IntToPtr:
949 case Instruction::BitCast:
950 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
951 case Instruction::Select:
952 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
953 case Instruction::InsertElement:
954 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
955 case Instruction::ExtractElement:
956 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
957 case Instruction::ShuffleVector:
958 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
959 case Instruction::GetElementPtr:
961 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
962 cast<GEPOperator>(this)->isInBounds());
963 case Instruction::ICmp:
964 case Instruction::FCmp:
965 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
967 assert(getNumOperands() == 2 && "Must be binary operator?");
968 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
973 //===----------------------------------------------------------------------===//
974 // isValueValidForType implementations
976 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
977 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
978 if (Ty == Type::getInt1Ty(Ty->getContext()))
979 return Val == 0 || Val == 1;
981 return true; // always true, has to fit in largest type
982 uint64_t Max = (1ll << NumBits) - 1;
986 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
987 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
988 if (Ty == Type::getInt1Ty(Ty->getContext()))
989 return Val == 0 || Val == 1 || Val == -1;
991 return true; // always true, has to fit in largest type
992 int64_t Min = -(1ll << (NumBits-1));
993 int64_t Max = (1ll << (NumBits-1)) - 1;
994 return (Val >= Min && Val <= Max);
997 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
998 // convert modifies in place, so make a copy.
999 APFloat Val2 = APFloat(Val);
1001 switch (Ty->getTypeID()) {
1003 return false; // These can't be represented as floating point!
1005 // FIXME rounding mode needs to be more flexible
1006 case Type::HalfTyID: {
1007 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1009 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1012 case Type::FloatTyID: {
1013 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1015 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1018 case Type::DoubleTyID: {
1019 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1020 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1021 &Val2.getSemantics() == &APFloat::IEEEdouble)
1023 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1026 case Type::X86_FP80TyID:
1027 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1028 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1029 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1030 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1031 case Type::FP128TyID:
1032 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1033 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1034 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1035 &Val2.getSemantics() == &APFloat::IEEEquad;
1036 case Type::PPC_FP128TyID:
1037 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1038 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1039 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1040 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1045 //===----------------------------------------------------------------------===//
1046 // Factory Function Implementation
1048 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1049 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1050 "Cannot create an aggregate zero of non-aggregate type!");
1052 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1054 Entry = new ConstantAggregateZero(Ty);
1059 /// destroyConstant - Remove the constant from the constant table.
1061 void ConstantAggregateZero::destroyConstant() {
1062 getContext().pImpl->CAZConstants.erase(getType());
1063 destroyConstantImpl();
1066 /// destroyConstant - Remove the constant from the constant table...
1068 void ConstantArray::destroyConstant() {
1069 getType()->getContext().pImpl->ArrayConstants.remove(this);
1070 destroyConstantImpl();
1073 /// isString - This method returns true if the array is an array of i8, and
1074 /// if the elements of the array are all ConstantInt's.
1075 bool ConstantArray::isString() const {
1076 // Check the element type for i8...
1077 if (!getType()->getElementType()->isIntegerTy(8))
1079 // Check the elements to make sure they are all integers, not constant
1081 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1082 if (!isa<ConstantInt>(getOperand(i)))
1087 /// isCString - This method returns true if the array is a string (see
1088 /// isString) and it ends in a null byte \\0 and does not contains any other
1089 /// null bytes except its terminator.
1090 bool ConstantArray::isCString() const {
1091 // Check the element type for i8...
1092 if (!getType()->getElementType()->isIntegerTy(8))
1095 // Last element must be a null.
1096 if (!getOperand(getNumOperands()-1)->isNullValue())
1098 // Other elements must be non-null integers.
1099 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1100 if (!isa<ConstantInt>(getOperand(i)))
1102 if (getOperand(i)->isNullValue())
1109 /// convertToString - Helper function for getAsString() and getAsCString().
1110 static std::string convertToString(const User *U, unsigned len) {
1112 Result.reserve(len);
1113 for (unsigned i = 0; i != len; ++i)
1114 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1118 /// getAsString - If this array is isString(), then this method converts the
1119 /// array to an std::string and returns it. Otherwise, it asserts out.
1121 std::string ConstantArray::getAsString() const {
1122 assert(isString() && "Not a string!");
1123 return convertToString(this, getNumOperands());
1127 /// getAsCString - If this array is isCString(), then this method converts the
1128 /// array (without the trailing null byte) to an std::string and returns it.
1129 /// Otherwise, it asserts out.
1131 std::string ConstantArray::getAsCString() const {
1132 assert(isCString() && "Not a string!");
1133 return convertToString(this, getNumOperands() - 1);
1137 //---- ConstantStruct::get() implementation...
1140 // destroyConstant - Remove the constant from the constant table...
1142 void ConstantStruct::destroyConstant() {
1143 getType()->getContext().pImpl->StructConstants.remove(this);
1144 destroyConstantImpl();
1147 // destroyConstant - Remove the constant from the constant table...
1149 void ConstantVector::destroyConstant() {
1150 getType()->getContext().pImpl->VectorConstants.remove(this);
1151 destroyConstantImpl();
1154 /// getSplatValue - If this is a splat constant, where all of the
1155 /// elements have the same value, return that value. Otherwise return null.
1156 Constant *ConstantVector::getSplatValue() const {
1157 // Check out first element.
1158 Constant *Elt = getOperand(0);
1159 // Then make sure all remaining elements point to the same value.
1160 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1161 if (getOperand(I) != Elt)
1166 //---- ConstantPointerNull::get() implementation.
1169 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1170 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1172 Entry = new ConstantPointerNull(Ty);
1177 // destroyConstant - Remove the constant from the constant table...
1179 void ConstantPointerNull::destroyConstant() {
1180 getContext().pImpl->CPNConstants.erase(getType());
1181 // Free the constant and any dangling references to it.
1182 destroyConstantImpl();
1186 //---- UndefValue::get() implementation.
1189 UndefValue *UndefValue::get(Type *Ty) {
1190 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1192 Entry = new UndefValue(Ty);
1197 // destroyConstant - Remove the constant from the constant table.
1199 void UndefValue::destroyConstant() {
1200 // Free the constant and any dangling references to it.
1201 getContext().pImpl->UVConstants.erase(getType());
1202 destroyConstantImpl();
1205 //---- BlockAddress::get() implementation.
1208 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1209 assert(BB->getParent() != 0 && "Block must have a parent");
1210 return get(BB->getParent(), BB);
1213 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1215 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1217 BA = new BlockAddress(F, BB);
1219 assert(BA->getFunction() == F && "Basic block moved between functions");
1223 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1224 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1228 BB->AdjustBlockAddressRefCount(1);
1232 // destroyConstant - Remove the constant from the constant table.
1234 void BlockAddress::destroyConstant() {
1235 getFunction()->getType()->getContext().pImpl
1236 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1237 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1238 destroyConstantImpl();
1241 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1242 // This could be replacing either the Basic Block or the Function. In either
1243 // case, we have to remove the map entry.
1244 Function *NewF = getFunction();
1245 BasicBlock *NewBB = getBasicBlock();
1248 NewF = cast<Function>(To);
1250 NewBB = cast<BasicBlock>(To);
1252 // See if the 'new' entry already exists, if not, just update this in place
1253 // and return early.
1254 BlockAddress *&NewBA =
1255 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1257 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1259 // Remove the old entry, this can't cause the map to rehash (just a
1260 // tombstone will get added).
1261 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1264 setOperand(0, NewF);
1265 setOperand(1, NewBB);
1266 getBasicBlock()->AdjustBlockAddressRefCount(1);
1270 // Otherwise, I do need to replace this with an existing value.
1271 assert(NewBA != this && "I didn't contain From!");
1273 // Everyone using this now uses the replacement.
1274 replaceAllUsesWith(NewBA);
1279 //---- ConstantExpr::get() implementations.
1282 /// This is a utility function to handle folding of casts and lookup of the
1283 /// cast in the ExprConstants map. It is used by the various get* methods below.
1284 static inline Constant *getFoldedCast(
1285 Instruction::CastOps opc, Constant *C, Type *Ty) {
1286 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1287 // Fold a few common cases
1288 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1291 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1293 // Look up the constant in the table first to ensure uniqueness
1294 std::vector<Constant*> argVec(1, C);
1295 ExprMapKeyType Key(opc, argVec);
1297 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1300 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1301 Instruction::CastOps opc = Instruction::CastOps(oc);
1302 assert(Instruction::isCast(opc) && "opcode out of range");
1303 assert(C && Ty && "Null arguments to getCast");
1304 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1308 llvm_unreachable("Invalid cast opcode");
1309 case Instruction::Trunc: return getTrunc(C, Ty);
1310 case Instruction::ZExt: return getZExt(C, Ty);
1311 case Instruction::SExt: return getSExt(C, Ty);
1312 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1313 case Instruction::FPExt: return getFPExtend(C, Ty);
1314 case Instruction::UIToFP: return getUIToFP(C, Ty);
1315 case Instruction::SIToFP: return getSIToFP(C, Ty);
1316 case Instruction::FPToUI: return getFPToUI(C, Ty);
1317 case Instruction::FPToSI: return getFPToSI(C, Ty);
1318 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1319 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1320 case Instruction::BitCast: return getBitCast(C, Ty);
1324 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1325 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1326 return getBitCast(C, Ty);
1327 return getZExt(C, Ty);
1330 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1331 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1332 return getBitCast(C, Ty);
1333 return getSExt(C, Ty);
1336 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1337 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1338 return getBitCast(C, Ty);
1339 return getTrunc(C, Ty);
1342 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1343 assert(S->getType()->isPointerTy() && "Invalid cast");
1344 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1346 if (Ty->isIntegerTy())
1347 return getPtrToInt(S, Ty);
1348 return getBitCast(S, Ty);
1351 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1353 assert(C->getType()->isIntOrIntVectorTy() &&
1354 Ty->isIntOrIntVectorTy() && "Invalid cast");
1355 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1356 unsigned DstBits = Ty->getScalarSizeInBits();
1357 Instruction::CastOps opcode =
1358 (SrcBits == DstBits ? Instruction::BitCast :
1359 (SrcBits > DstBits ? Instruction::Trunc :
1360 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1361 return getCast(opcode, C, Ty);
1364 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1365 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1367 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1368 unsigned DstBits = Ty->getScalarSizeInBits();
1369 if (SrcBits == DstBits)
1370 return C; // Avoid a useless cast
1371 Instruction::CastOps opcode =
1372 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1373 return getCast(opcode, C, Ty);
1376 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1378 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1379 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1381 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1382 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1383 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1384 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1385 "SrcTy must be larger than DestTy for Trunc!");
1387 return getFoldedCast(Instruction::Trunc, C, Ty);
1390 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1392 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1393 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1395 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1396 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1397 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1398 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1399 "SrcTy must be smaller than DestTy for SExt!");
1401 return getFoldedCast(Instruction::SExt, C, Ty);
1404 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1406 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1407 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1409 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1410 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1411 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1412 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1413 "SrcTy must be smaller than DestTy for ZExt!");
1415 return getFoldedCast(Instruction::ZExt, C, Ty);
1418 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1420 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1421 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1423 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1424 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1425 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1426 "This is an illegal floating point truncation!");
1427 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1430 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1432 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1433 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1435 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1436 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1437 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1438 "This is an illegal floating point extension!");
1439 return getFoldedCast(Instruction::FPExt, C, Ty);
1442 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1444 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1445 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1447 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1448 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1449 "This is an illegal uint to floating point cast!");
1450 return getFoldedCast(Instruction::UIToFP, C, Ty);
1453 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1455 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1456 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1458 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1459 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1460 "This is an illegal sint to floating point cast!");
1461 return getFoldedCast(Instruction::SIToFP, C, Ty);
1464 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1466 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1467 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1469 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1470 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1471 "This is an illegal floating point to uint cast!");
1472 return getFoldedCast(Instruction::FPToUI, C, Ty);
1475 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1477 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1478 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1480 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1481 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1482 "This is an illegal floating point to sint cast!");
1483 return getFoldedCast(Instruction::FPToSI, C, Ty);
1486 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1487 assert(C->getType()->getScalarType()->isPointerTy() &&
1488 "PtrToInt source must be pointer or pointer vector");
1489 assert(DstTy->getScalarType()->isIntegerTy() &&
1490 "PtrToInt destination must be integer or integer vector");
1491 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1492 "Invalid cast between a different number of vector elements");
1493 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1496 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1497 assert(C->getType()->getScalarType()->isIntegerTy() &&
1498 "IntToPtr source must be integer or integer vector");
1499 assert(DstTy->getScalarType()->isPointerTy() &&
1500 "IntToPtr destination must be a pointer or pointer vector");
1501 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1502 "Invalid cast between a different number of vector elements");
1503 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1506 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1507 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1508 "Invalid constantexpr bitcast!");
1510 // It is common to ask for a bitcast of a value to its own type, handle this
1512 if (C->getType() == DstTy) return C;
1514 return getFoldedCast(Instruction::BitCast, C, DstTy);
1517 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1519 // Check the operands for consistency first.
1520 assert(Opcode >= Instruction::BinaryOpsBegin &&
1521 Opcode < Instruction::BinaryOpsEnd &&
1522 "Invalid opcode in binary constant expression");
1523 assert(C1->getType() == C2->getType() &&
1524 "Operand types in binary constant expression should match");
1528 case Instruction::Add:
1529 case Instruction::Sub:
1530 case Instruction::Mul:
1531 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1532 assert(C1->getType()->isIntOrIntVectorTy() &&
1533 "Tried to create an integer operation on a non-integer type!");
1535 case Instruction::FAdd:
1536 case Instruction::FSub:
1537 case Instruction::FMul:
1538 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1539 assert(C1->getType()->isFPOrFPVectorTy() &&
1540 "Tried to create a floating-point operation on a "
1541 "non-floating-point type!");
1543 case Instruction::UDiv:
1544 case Instruction::SDiv:
1545 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1546 assert(C1->getType()->isIntOrIntVectorTy() &&
1547 "Tried to create an arithmetic operation on a non-arithmetic type!");
1549 case Instruction::FDiv:
1550 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1551 assert(C1->getType()->isFPOrFPVectorTy() &&
1552 "Tried to create an arithmetic operation on a non-arithmetic type!");
1554 case Instruction::URem:
1555 case Instruction::SRem:
1556 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1557 assert(C1->getType()->isIntOrIntVectorTy() &&
1558 "Tried to create an arithmetic operation on a non-arithmetic type!");
1560 case Instruction::FRem:
1561 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1562 assert(C1->getType()->isFPOrFPVectorTy() &&
1563 "Tried to create an arithmetic operation on a non-arithmetic type!");
1565 case Instruction::And:
1566 case Instruction::Or:
1567 case Instruction::Xor:
1568 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1569 assert(C1->getType()->isIntOrIntVectorTy() &&
1570 "Tried to create a logical operation on a non-integral type!");
1572 case Instruction::Shl:
1573 case Instruction::LShr:
1574 case Instruction::AShr:
1575 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1576 assert(C1->getType()->isIntOrIntVectorTy() &&
1577 "Tried to create a shift operation on a non-integer type!");
1584 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1585 return FC; // Fold a few common cases.
1587 std::vector<Constant*> argVec(1, C1);
1588 argVec.push_back(C2);
1589 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1591 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1592 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1595 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1596 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1597 // Note that a non-inbounds gep is used, as null isn't within any object.
1598 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1599 Constant *GEP = getGetElementPtr(
1600 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1601 return getPtrToInt(GEP,
1602 Type::getInt64Ty(Ty->getContext()));
1605 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1606 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1607 // Note that a non-inbounds gep is used, as null isn't within any object.
1609 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1610 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1611 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1612 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1613 Constant *Indices[2] = { Zero, One };
1614 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1615 return getPtrToInt(GEP,
1616 Type::getInt64Ty(Ty->getContext()));
1619 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1620 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1624 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1625 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1626 // Note that a non-inbounds gep is used, as null isn't within any object.
1627 Constant *GEPIdx[] = {
1628 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1631 Constant *GEP = getGetElementPtr(
1632 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1633 return getPtrToInt(GEP,
1634 Type::getInt64Ty(Ty->getContext()));
1637 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1638 Constant *C1, Constant *C2) {
1639 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1641 switch (Predicate) {
1642 default: llvm_unreachable("Invalid CmpInst predicate");
1643 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1644 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1645 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1646 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1647 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1648 case CmpInst::FCMP_TRUE:
1649 return getFCmp(Predicate, C1, C2);
1651 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1652 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1653 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1654 case CmpInst::ICMP_SLE:
1655 return getICmp(Predicate, C1, C2);
1659 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1660 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1662 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1663 return SC; // Fold common cases
1665 std::vector<Constant*> argVec(3, C);
1668 ExprMapKeyType Key(Instruction::Select, argVec);
1670 LLVMContextImpl *pImpl = C->getContext().pImpl;
1671 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1674 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1676 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1677 return FC; // Fold a few common cases.
1679 // Get the result type of the getelementptr!
1680 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1681 assert(Ty && "GEP indices invalid!");
1682 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1683 Type *ReqTy = Ty->getPointerTo(AS);
1685 assert(C->getType()->isPointerTy() &&
1686 "Non-pointer type for constant GetElementPtr expression");
1687 // Look up the constant in the table first to ensure uniqueness
1688 std::vector<Constant*> ArgVec;
1689 ArgVec.reserve(1 + Idxs.size());
1690 ArgVec.push_back(C);
1691 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1692 ArgVec.push_back(cast<Constant>(Idxs[i]));
1693 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1694 InBounds ? GEPOperator::IsInBounds : 0);
1696 LLVMContextImpl *pImpl = C->getContext().pImpl;
1697 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1701 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1702 assert(LHS->getType() == RHS->getType());
1703 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1704 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1706 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1707 return FC; // Fold a few common cases...
1709 // Look up the constant in the table first to ensure uniqueness
1710 std::vector<Constant*> ArgVec;
1711 ArgVec.push_back(LHS);
1712 ArgVec.push_back(RHS);
1713 // Get the key type with both the opcode and predicate
1714 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1716 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1717 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1718 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1720 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1721 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1725 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1726 assert(LHS->getType() == RHS->getType());
1727 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1729 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1730 return FC; // Fold a few common cases...
1732 // Look up the constant in the table first to ensure uniqueness
1733 std::vector<Constant*> ArgVec;
1734 ArgVec.push_back(LHS);
1735 ArgVec.push_back(RHS);
1736 // Get the key type with both the opcode and predicate
1737 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1739 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1740 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1741 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1743 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1744 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1747 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1748 assert(Val->getType()->isVectorTy() &&
1749 "Tried to create extractelement operation on non-vector type!");
1750 assert(Idx->getType()->isIntegerTy(32) &&
1751 "Extractelement index must be i32 type!");
1753 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1754 return FC; // Fold a few common cases.
1756 // Look up the constant in the table first to ensure uniqueness
1757 std::vector<Constant*> ArgVec(1, Val);
1758 ArgVec.push_back(Idx);
1759 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1761 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1762 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1763 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1766 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1768 assert(Val->getType()->isVectorTy() &&
1769 "Tried to create insertelement operation on non-vector type!");
1770 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1771 && "Insertelement types must match!");
1772 assert(Idx->getType()->isIntegerTy(32) &&
1773 "Insertelement index must be i32 type!");
1775 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1776 return FC; // Fold a few common cases.
1777 // Look up the constant in the table first to ensure uniqueness
1778 std::vector<Constant*> ArgVec(1, Val);
1779 ArgVec.push_back(Elt);
1780 ArgVec.push_back(Idx);
1781 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1783 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1784 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1787 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1789 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1790 "Invalid shuffle vector constant expr operands!");
1792 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1793 return FC; // Fold a few common cases.
1795 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1796 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1797 Type *ShufTy = VectorType::get(EltTy, NElts);
1799 // Look up the constant in the table first to ensure uniqueness
1800 std::vector<Constant*> ArgVec(1, V1);
1801 ArgVec.push_back(V2);
1802 ArgVec.push_back(Mask);
1803 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1805 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1806 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1809 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1810 ArrayRef<unsigned> Idxs) {
1811 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1812 Idxs) == Val->getType() &&
1813 "insertvalue indices invalid!");
1814 assert(Agg->getType()->isFirstClassType() &&
1815 "Non-first-class type for constant insertvalue expression");
1816 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1817 assert(FC && "insertvalue constant expr couldn't be folded!");
1821 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1822 ArrayRef<unsigned> Idxs) {
1823 assert(Agg->getType()->isFirstClassType() &&
1824 "Tried to create extractelement operation on non-first-class type!");
1826 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1828 assert(ReqTy && "extractvalue indices invalid!");
1830 assert(Agg->getType()->isFirstClassType() &&
1831 "Non-first-class type for constant extractvalue expression");
1832 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1833 assert(FC && "ExtractValue constant expr couldn't be folded!");
1837 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1838 assert(C->getType()->isIntOrIntVectorTy() &&
1839 "Cannot NEG a nonintegral value!");
1840 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1844 Constant *ConstantExpr::getFNeg(Constant *C) {
1845 assert(C->getType()->isFPOrFPVectorTy() &&
1846 "Cannot FNEG a non-floating-point value!");
1847 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1850 Constant *ConstantExpr::getNot(Constant *C) {
1851 assert(C->getType()->isIntOrIntVectorTy() &&
1852 "Cannot NOT a nonintegral value!");
1853 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1856 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1857 bool HasNUW, bool HasNSW) {
1858 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1859 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1860 return get(Instruction::Add, C1, C2, Flags);
1863 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1864 return get(Instruction::FAdd, C1, C2);
1867 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1868 bool HasNUW, bool HasNSW) {
1869 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1870 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1871 return get(Instruction::Sub, C1, C2, Flags);
1874 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1875 return get(Instruction::FSub, C1, C2);
1878 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1879 bool HasNUW, bool HasNSW) {
1880 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1881 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1882 return get(Instruction::Mul, C1, C2, Flags);
1885 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1886 return get(Instruction::FMul, C1, C2);
1889 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1890 return get(Instruction::UDiv, C1, C2,
1891 isExact ? PossiblyExactOperator::IsExact : 0);
1894 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1895 return get(Instruction::SDiv, C1, C2,
1896 isExact ? PossiblyExactOperator::IsExact : 0);
1899 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1900 return get(Instruction::FDiv, C1, C2);
1903 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1904 return get(Instruction::URem, C1, C2);
1907 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1908 return get(Instruction::SRem, C1, C2);
1911 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1912 return get(Instruction::FRem, C1, C2);
1915 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1916 return get(Instruction::And, C1, C2);
1919 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1920 return get(Instruction::Or, C1, C2);
1923 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1924 return get(Instruction::Xor, C1, C2);
1927 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1928 bool HasNUW, bool HasNSW) {
1929 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1930 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1931 return get(Instruction::Shl, C1, C2, Flags);
1934 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1935 return get(Instruction::LShr, C1, C2,
1936 isExact ? PossiblyExactOperator::IsExact : 0);
1939 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1940 return get(Instruction::AShr, C1, C2,
1941 isExact ? PossiblyExactOperator::IsExact : 0);
1944 // destroyConstant - Remove the constant from the constant table...
1946 void ConstantExpr::destroyConstant() {
1947 getType()->getContext().pImpl->ExprConstants.remove(this);
1948 destroyConstantImpl();
1951 const char *ConstantExpr::getOpcodeName() const {
1952 return Instruction::getOpcodeName(getOpcode());
1957 GetElementPtrConstantExpr::
1958 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1960 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1961 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1962 - (IdxList.size()+1), IdxList.size()+1) {
1964 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1965 OperandList[i+1] = IdxList[i];
1968 //===----------------------------------------------------------------------===//
1969 // ConstantData* implementations
1971 void ConstantDataArray::anchor() {}
1972 void ConstantDataVector::anchor() {}
1974 /// getElementType - Return the element type of the array/vector.
1975 Type *ConstantDataSequential::getElementType() const {
1976 return getType()->getElementType();
1979 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
1980 /// formed with a vector or array of the specified element type.
1981 /// ConstantDataArray only works with normal float and int types that are
1982 /// stored densely in memory, not with things like i42 or x86_f80.
1983 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
1984 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
1985 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
1986 switch (IT->getBitWidth()) {
1998 /// getElementByteSize - Return the size in bytes of the elements in the data.
1999 uint64_t ConstantDataSequential::getElementByteSize() const {
2000 return getElementType()->getPrimitiveSizeInBits()/8;
2003 /// getElementPointer - Return the start of the specified element.
2004 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2005 assert(Elt < getElementType()->getNumElements() && "Invalid Elt");
2006 return DataElements+Elt*getElementByteSize();
2010 /// isAllZeros - return true if the array is empty or all zeros.
2011 static bool isAllZeros(StringRef Arr) {
2012 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2018 /// getImpl - This is the underlying implementation of all of the
2019 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2020 /// the correct element type. We take the bytes in as an StringRef because
2021 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2022 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2023 assert(isElementTypeCompatible(cast<SequentialType>(Ty)->getElementType()));
2024 // If the elements are all zero, return a CAZ, which is more dense.
2025 if (isAllZeros(Elements))
2026 return ConstantAggregateZero::get(Ty);
2028 // Do a lookup to see if we have already formed one of these.
2029 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2030 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2032 // The bucket can point to a linked list of different CDS's that have the same
2033 // body but different types. For example, 0,0,0,1 could be a 4 element array
2034 // of i8, or a 1-element array of i32. They'll both end up in the same
2035 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2036 ConstantDataSequential **Entry = &Slot.getValue();
2037 for (ConstantDataSequential *Node = *Entry; Node != 0;
2038 Entry = &Node->Next, Node = *Entry)
2039 if (Node->getType() == Ty)
2042 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2044 if (isa<ArrayType>(Ty))
2045 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2047 assert(isa<VectorType>(Ty));
2048 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2051 void ConstantDataSequential::destroyConstant() {
2052 uint64_t ByteSize = getElementByteSize() * getElementType()->getNumElements();
2054 // Remove the constant from the StringMap.
2055 StringMap<ConstantDataSequential*> &CDSConstants =
2056 getType()->getContext().pImpl->CDSConstants;
2058 StringMap<ConstantDataSequential*>::iterator Slot =
2059 CDSConstants.find(StringRef(DataElements, ByteSize));
2061 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2063 ConstantDataSequential **Entry = &Slot->getValue();
2065 // Remove the entry from the hash table.
2066 if ((*Entry)->Next == 0) {
2067 // If there is only one value in the bucket (common case) it must be this
2068 // entry, and removing the entry should remove the bucket completely.
2069 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2070 getContext().pImpl->CDSConstants.erase(Slot);
2072 // Otherwise, there are multiple entries linked off the bucket, unlink the
2073 // node we care about but keep the bucket around.
2074 for (ConstantDataSequential *Node = *Entry; ;
2075 Entry = &Node->Next, Node = *Entry) {
2076 assert(Node && "Didn't find entry in its uniquing hash table!");
2077 // If we found our entry, unlink it from the list and we're done.
2079 *Entry = Node->Next;
2085 // If we were part of a list, make sure that we don't delete the list that is
2086 // still owned by the uniquing map.
2089 // Finally, actually delete it.
2090 destroyConstantImpl();
2093 /// get() constructors - Return a constant with array type with an element
2094 /// count and element type matching the ArrayRef passed in. Note that this
2095 /// can return a ConstantAggregateZero object.
2096 Constant *ConstantDataArray::get(ArrayRef<uint8_t> Elts, LLVMContext &Context) {
2097 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2098 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2100 Constant *ConstantDataArray::get(ArrayRef<uint16_t> Elts, LLVMContext &Context){
2101 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2102 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2104 Constant *ConstantDataArray::get(ArrayRef<uint32_t> Elts, LLVMContext &Context){
2105 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2106 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2108 Constant *ConstantDataArray::get(ArrayRef<uint64_t> Elts, LLVMContext &Context){
2109 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2110 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2112 Constant *ConstantDataArray::get(ArrayRef<float> Elts, LLVMContext &Context) {
2113 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2114 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2116 Constant *ConstantDataArray::get(ArrayRef<double> Elts, LLVMContext &Context) {
2117 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2118 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2122 /// get() constructors - Return a constant with vector type with an element
2123 /// count and element type matching the ArrayRef passed in. Note that this
2124 /// can return a ConstantAggregateZero object.
2125 Constant *ConstantDataVector::get(ArrayRef<uint8_t> Elts, LLVMContext &Context) {
2126 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2127 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2129 Constant *ConstantDataVector::get(ArrayRef<uint16_t> Elts, LLVMContext &Context){
2130 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2131 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2133 Constant *ConstantDataVector::get(ArrayRef<uint32_t> Elts, LLVMContext &Context){
2134 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2135 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2137 Constant *ConstantDataVector::get(ArrayRef<uint64_t> Elts, LLVMContext &Context){
2138 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2139 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2141 Constant *ConstantDataVector::get(ArrayRef<float> Elts, LLVMContext &Context) {
2142 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2143 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2145 Constant *ConstantDataVector::get(ArrayRef<double> Elts, LLVMContext &Context) {
2146 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2147 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2150 /// getElementAsInteger - If this is a sequential container of integers (of
2151 /// any size), return the specified element in the low bits of a uint64_t.
2152 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2153 assert(isa<IntegerType>(getElementType()) &&
2154 "Accessor can only be used when element is an integer");
2155 const char *EltPtr = getElementPointer(Elt);
2157 // The data is stored in host byte order, make sure to cast back to the right
2158 // type to load with the right endianness.
2159 switch (cast<IntegerType>(getElementType())->getBitWidth()) {
2160 default: assert(0 && "Invalid bitwidth for CDS");
2161 case 8: return *(uint8_t*)EltPtr;
2162 case 16: return *(uint16_t*)EltPtr;
2163 case 32: return *(uint32_t*)EltPtr;
2164 case 64: return *(uint64_t*)EltPtr;
2168 /// getElementAsAPFloat - If this is a sequential container of floating point
2169 /// type, return the specified element as an APFloat.
2170 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2171 const char *EltPtr = getElementPointer(Elt);
2173 switch (getElementType()->getTypeID()) {
2174 default: assert("Accessor can only be used when element is float/double!");
2175 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2176 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2180 /// getElementAsFloat - If this is an sequential container of floats, return
2181 /// the specified element as a float.
2182 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2183 assert(getElementType()->isFloatTy() &&
2184 "Accessor can only be used when element is a 'float'");
2185 return *(float*)getElementPointer(Elt);
2188 /// getElementAsDouble - If this is an sequential container of doubles, return
2189 /// the specified element as a float.
2190 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2191 assert(getElementType()->isDoubleTy() &&
2192 "Accessor can only be used when element is a 'float'");
2193 return *(double*)getElementPointer(Elt);
2196 /// getElementAsConstant - Return a Constant for a specified index's element.
2197 /// Note that this has to compute a new constant to return, so it isn't as
2198 /// efficient as getElementAsInteger/Float/Double.
2199 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2200 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2201 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2203 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2209 //===----------------------------------------------------------------------===//
2210 // replaceUsesOfWithOnConstant implementations
2212 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2213 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2216 /// Note that we intentionally replace all uses of From with To here. Consider
2217 /// a large array that uses 'From' 1000 times. By handling this case all here,
2218 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2219 /// single invocation handles all 1000 uses. Handling them one at a time would
2220 /// work, but would be really slow because it would have to unique each updated
2223 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2225 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2226 Constant *ToC = cast<Constant>(To);
2228 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2230 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2231 Lookup.first.first = cast<ArrayType>(getType());
2232 Lookup.second = this;
2234 std::vector<Constant*> &Values = Lookup.first.second;
2235 Values.reserve(getNumOperands()); // Build replacement array.
2237 // Fill values with the modified operands of the constant array. Also,
2238 // compute whether this turns into an all-zeros array.
2239 bool isAllZeros = false;
2240 unsigned NumUpdated = 0;
2241 if (!ToC->isNullValue()) {
2242 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2243 Constant *Val = cast<Constant>(O->get());
2248 Values.push_back(Val);
2252 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2253 Constant *Val = cast<Constant>(O->get());
2258 Values.push_back(Val);
2259 if (isAllZeros) isAllZeros = Val->isNullValue();
2263 Constant *Replacement = 0;
2265 Replacement = ConstantAggregateZero::get(getType());
2267 // Check to see if we have this array type already.
2269 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2270 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2273 Replacement = I->second;
2275 // Okay, the new shape doesn't exist in the system yet. Instead of
2276 // creating a new constant array, inserting it, replaceallusesof'ing the
2277 // old with the new, then deleting the old... just update the current one
2279 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2281 // Update to the new value. Optimize for the case when we have a single
2282 // operand that we're changing, but handle bulk updates efficiently.
2283 if (NumUpdated == 1) {
2284 unsigned OperandToUpdate = U - OperandList;
2285 assert(getOperand(OperandToUpdate) == From &&
2286 "ReplaceAllUsesWith broken!");
2287 setOperand(OperandToUpdate, ToC);
2289 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2290 if (getOperand(i) == From)
2297 // Otherwise, I do need to replace this with an existing value.
2298 assert(Replacement != this && "I didn't contain From!");
2300 // Everyone using this now uses the replacement.
2301 replaceAllUsesWith(Replacement);
2303 // Delete the old constant!
2307 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2309 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2310 Constant *ToC = cast<Constant>(To);
2312 unsigned OperandToUpdate = U-OperandList;
2313 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2315 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2316 Lookup.first.first = cast<StructType>(getType());
2317 Lookup.second = this;
2318 std::vector<Constant*> &Values = Lookup.first.second;
2319 Values.reserve(getNumOperands()); // Build replacement struct.
2322 // Fill values with the modified operands of the constant struct. Also,
2323 // compute whether this turns into an all-zeros struct.
2324 bool isAllZeros = false;
2325 if (!ToC->isNullValue()) {
2326 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2327 Values.push_back(cast<Constant>(O->get()));
2330 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2331 Constant *Val = cast<Constant>(O->get());
2332 Values.push_back(Val);
2333 if (isAllZeros) isAllZeros = Val->isNullValue();
2336 Values[OperandToUpdate] = ToC;
2338 LLVMContextImpl *pImpl = getContext().pImpl;
2340 Constant *Replacement = 0;
2342 Replacement = ConstantAggregateZero::get(getType());
2344 // Check to see if we have this struct type already.
2346 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2347 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2350 Replacement = I->second;
2352 // Okay, the new shape doesn't exist in the system yet. Instead of
2353 // creating a new constant struct, inserting it, replaceallusesof'ing the
2354 // old with the new, then deleting the old... just update the current one
2356 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2358 // Update to the new value.
2359 setOperand(OperandToUpdate, ToC);
2364 assert(Replacement != this && "I didn't contain From!");
2366 // Everyone using this now uses the replacement.
2367 replaceAllUsesWith(Replacement);
2369 // Delete the old constant!
2373 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2375 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2377 std::vector<Constant*> Values;
2378 Values.reserve(getNumOperands()); // Build replacement array...
2379 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2380 Constant *Val = getOperand(i);
2381 if (Val == From) Val = cast<Constant>(To);
2382 Values.push_back(Val);
2385 Constant *Replacement = get(Values);
2386 assert(Replacement != this && "I didn't contain From!");
2388 // Everyone using this now uses the replacement.
2389 replaceAllUsesWith(Replacement);
2391 // Delete the old constant!
2395 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2397 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2398 Constant *To = cast<Constant>(ToV);
2400 Constant *Replacement = 0;
2401 if (getOpcode() == Instruction::GetElementPtr) {
2402 SmallVector<Constant*, 8> Indices;
2403 Constant *Pointer = getOperand(0);
2404 Indices.reserve(getNumOperands()-1);
2405 if (Pointer == From) Pointer = To;
2407 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2408 Constant *Val = getOperand(i);
2409 if (Val == From) Val = To;
2410 Indices.push_back(Val);
2412 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2413 cast<GEPOperator>(this)->isInBounds());
2414 } else if (getOpcode() == Instruction::ExtractValue) {
2415 Constant *Agg = getOperand(0);
2416 if (Agg == From) Agg = To;
2418 ArrayRef<unsigned> Indices = getIndices();
2419 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2420 } else if (getOpcode() == Instruction::InsertValue) {
2421 Constant *Agg = getOperand(0);
2422 Constant *Val = getOperand(1);
2423 if (Agg == From) Agg = To;
2424 if (Val == From) Val = To;
2426 ArrayRef<unsigned> Indices = getIndices();
2427 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2428 } else if (isCast()) {
2429 assert(getOperand(0) == From && "Cast only has one use!");
2430 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2431 } else if (getOpcode() == Instruction::Select) {
2432 Constant *C1 = getOperand(0);
2433 Constant *C2 = getOperand(1);
2434 Constant *C3 = getOperand(2);
2435 if (C1 == From) C1 = To;
2436 if (C2 == From) C2 = To;
2437 if (C3 == From) C3 = To;
2438 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2439 } else if (getOpcode() == Instruction::ExtractElement) {
2440 Constant *C1 = getOperand(0);
2441 Constant *C2 = getOperand(1);
2442 if (C1 == From) C1 = To;
2443 if (C2 == From) C2 = To;
2444 Replacement = ConstantExpr::getExtractElement(C1, C2);
2445 } else if (getOpcode() == Instruction::InsertElement) {
2446 Constant *C1 = getOperand(0);
2447 Constant *C2 = getOperand(1);
2448 Constant *C3 = getOperand(1);
2449 if (C1 == From) C1 = To;
2450 if (C2 == From) C2 = To;
2451 if (C3 == From) C3 = To;
2452 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2453 } else if (getOpcode() == Instruction::ShuffleVector) {
2454 Constant *C1 = getOperand(0);
2455 Constant *C2 = getOperand(1);
2456 Constant *C3 = getOperand(2);
2457 if (C1 == From) C1 = To;
2458 if (C2 == From) C2 = To;
2459 if (C3 == From) C3 = To;
2460 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2461 } else if (isCompare()) {
2462 Constant *C1 = getOperand(0);
2463 Constant *C2 = getOperand(1);
2464 if (C1 == From) C1 = To;
2465 if (C2 == From) C2 = To;
2466 if (getOpcode() == Instruction::ICmp)
2467 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2469 assert(getOpcode() == Instruction::FCmp);
2470 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2472 } else if (getNumOperands() == 2) {
2473 Constant *C1 = getOperand(0);
2474 Constant *C2 = getOperand(1);
2475 if (C1 == From) C1 = To;
2476 if (C2 == From) C2 = To;
2477 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2479 llvm_unreachable("Unknown ConstantExpr type!");
2482 assert(Replacement != this && "I didn't contain From!");
2484 // Everyone using this now uses the replacement.
2485 replaceAllUsesWith(Replacement);
2487 // Delete the old constant!