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 /// getElementValue - Return a zero of the right value for the specified GEP
629 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) {
630 if (isa<SequentialType>(getType()))
631 return getSequentialElement();
632 return getStructElement(Idx);
636 //===----------------------------------------------------------------------===//
637 // UndefValue Implementation
638 //===----------------------------------------------------------------------===//
640 /// getSequentialElement - If this undef has array or vector type, return an
641 /// undef with the right element type.
642 UndefValue *UndefValue::getSequentialElement() {
643 return UndefValue::get(cast<SequentialType>(getType())->getElementType());
646 /// getStructElement - If this undef has struct type, return a zero with the
647 /// right element type for the specified element.
648 UndefValue *UndefValue::getStructElement(unsigned Elt) {
649 return UndefValue::get(cast<StructType>(getType())->getElementType(Elt));
652 /// getElementValue - Return an undef of the right value for the specified GEP
653 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
654 UndefValue *UndefValue::getElementValue(Constant *C) {
655 if (isa<SequentialType>(getType()))
656 return getSequentialElement();
657 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
660 /// getElementValue - Return an undef of the right value for the specified GEP
662 UndefValue *UndefValue::getElementValue(unsigned Idx) {
663 if (isa<SequentialType>(getType()))
664 return getSequentialElement();
665 return getStructElement(Idx);
670 //===----------------------------------------------------------------------===//
671 // ConstantXXX Classes
672 //===----------------------------------------------------------------------===//
675 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
676 : Constant(T, ConstantArrayVal,
677 OperandTraits<ConstantArray>::op_end(this) - V.size(),
679 assert(V.size() == T->getNumElements() &&
680 "Invalid initializer vector for constant array");
681 for (unsigned i = 0, e = V.size(); i != e; ++i)
682 assert(V[i]->getType() == T->getElementType() &&
683 "Initializer for array element doesn't match array element type!");
684 std::copy(V.begin(), V.end(), op_begin());
687 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
688 for (unsigned i = 0, e = V.size(); i != e; ++i) {
689 assert(V[i]->getType() == Ty->getElementType() &&
690 "Wrong type in array element initializer");
692 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
693 // If this is an all-zero array, return a ConstantAggregateZero object
696 if (!C->isNullValue())
697 return pImpl->ArrayConstants.getOrCreate(Ty, V);
699 for (unsigned i = 1, e = V.size(); i != e; ++i)
701 return pImpl->ArrayConstants.getOrCreate(Ty, V);
704 return ConstantAggregateZero::get(Ty);
707 /// ConstantArray::get(const string&) - Return an array that is initialized to
708 /// contain the specified string. If length is zero then a null terminator is
709 /// added to the specified string so that it may be used in a natural way.
710 /// Otherwise, the length parameter specifies how much of the string to use
711 /// and it won't be null terminated.
713 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
715 std::vector<Constant*> ElementVals;
716 ElementVals.reserve(Str.size() + size_t(AddNull));
717 for (unsigned i = 0; i < Str.size(); ++i)
718 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
720 // Add a null terminator to the string...
722 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
724 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
725 return get(ATy, ElementVals);
728 /// getTypeForElements - Return an anonymous struct type to use for a constant
729 /// with the specified set of elements. The list must not be empty.
730 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
731 ArrayRef<Constant*> V,
733 SmallVector<Type*, 16> EltTypes;
734 for (unsigned i = 0, e = V.size(); i != e; ++i)
735 EltTypes.push_back(V[i]->getType());
737 return StructType::get(Context, EltTypes, Packed);
741 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
744 "ConstantStruct::getTypeForElements cannot be called on empty list");
745 return getTypeForElements(V[0]->getContext(), V, Packed);
749 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
750 : Constant(T, ConstantStructVal,
751 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
753 assert(V.size() == T->getNumElements() &&
754 "Invalid initializer vector for constant structure");
755 for (unsigned i = 0, e = V.size(); i != e; ++i)
756 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
757 "Initializer for struct element doesn't match struct element type!");
758 std::copy(V.begin(), V.end(), op_begin());
761 // ConstantStruct accessors.
762 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
763 // Create a ConstantAggregateZero value if all elements are zeros.
764 for (unsigned i = 0, e = V.size(); i != e; ++i)
765 if (!V[i]->isNullValue())
766 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
768 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
769 "Incorrect # elements specified to ConstantStruct::get");
770 return ConstantAggregateZero::get(ST);
773 Constant *ConstantStruct::get(StructType *T, ...) {
775 SmallVector<Constant*, 8> Values;
777 while (Constant *Val = va_arg(ap, llvm::Constant*))
778 Values.push_back(Val);
780 return get(T, Values);
783 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
784 : Constant(T, ConstantVectorVal,
785 OperandTraits<ConstantVector>::op_end(this) - V.size(),
787 for (size_t i = 0, e = V.size(); i != e; i++)
788 assert(V[i]->getType() == T->getElementType() &&
789 "Initializer for vector element doesn't match vector element type!");
790 std::copy(V.begin(), V.end(), op_begin());
793 // ConstantVector accessors.
794 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
795 assert(!V.empty() && "Vectors can't be empty");
796 VectorType *T = VectorType::get(V.front()->getType(), V.size());
797 LLVMContextImpl *pImpl = T->getContext().pImpl;
799 // If this is an all-undef or all-zero vector, return a
800 // ConstantAggregateZero or UndefValue.
802 bool isZero = C->isNullValue();
803 bool isUndef = isa<UndefValue>(C);
805 if (isZero || isUndef) {
806 for (unsigned i = 1, e = V.size(); i != e; ++i)
808 isZero = isUndef = false;
814 return ConstantAggregateZero::get(T);
816 return UndefValue::get(T);
818 return pImpl->VectorConstants.getOrCreate(T, V);
821 // Utility function for determining if a ConstantExpr is a CastOp or not. This
822 // can't be inline because we don't want to #include Instruction.h into
824 bool ConstantExpr::isCast() const {
825 return Instruction::isCast(getOpcode());
828 bool ConstantExpr::isCompare() const {
829 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
832 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
833 if (getOpcode() != Instruction::GetElementPtr) return false;
835 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
836 User::const_op_iterator OI = llvm::next(this->op_begin());
838 // Skip the first index, as it has no static limit.
842 // The remaining indices must be compile-time known integers within the
843 // bounds of the corresponding notional static array types.
844 for (; GEPI != E; ++GEPI, ++OI) {
845 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
846 if (!CI) return false;
847 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
848 if (CI->getValue().getActiveBits() > 64 ||
849 CI->getZExtValue() >= ATy->getNumElements())
853 // All the indices checked out.
857 bool ConstantExpr::hasIndices() const {
858 return getOpcode() == Instruction::ExtractValue ||
859 getOpcode() == Instruction::InsertValue;
862 ArrayRef<unsigned> ConstantExpr::getIndices() const {
863 if (const ExtractValueConstantExpr *EVCE =
864 dyn_cast<ExtractValueConstantExpr>(this))
865 return EVCE->Indices;
867 return cast<InsertValueConstantExpr>(this)->Indices;
870 unsigned ConstantExpr::getPredicate() const {
872 return ((const CompareConstantExpr*)this)->predicate;
875 /// getWithOperandReplaced - Return a constant expression identical to this
876 /// one, but with the specified operand set to the specified value.
878 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
879 assert(OpNo < getNumOperands() && "Operand num is out of range!");
880 assert(Op->getType() == getOperand(OpNo)->getType() &&
881 "Replacing operand with value of different type!");
882 if (getOperand(OpNo) == Op)
883 return const_cast<ConstantExpr*>(this);
885 Constant *Op0, *Op1, *Op2;
886 switch (getOpcode()) {
887 case Instruction::Trunc:
888 case Instruction::ZExt:
889 case Instruction::SExt:
890 case Instruction::FPTrunc:
891 case Instruction::FPExt:
892 case Instruction::UIToFP:
893 case Instruction::SIToFP:
894 case Instruction::FPToUI:
895 case Instruction::FPToSI:
896 case Instruction::PtrToInt:
897 case Instruction::IntToPtr:
898 case Instruction::BitCast:
899 return ConstantExpr::getCast(getOpcode(), Op, getType());
900 case Instruction::Select:
901 Op0 = (OpNo == 0) ? Op : getOperand(0);
902 Op1 = (OpNo == 1) ? Op : getOperand(1);
903 Op2 = (OpNo == 2) ? Op : getOperand(2);
904 return ConstantExpr::getSelect(Op0, Op1, Op2);
905 case Instruction::InsertElement:
906 Op0 = (OpNo == 0) ? Op : getOperand(0);
907 Op1 = (OpNo == 1) ? Op : getOperand(1);
908 Op2 = (OpNo == 2) ? Op : getOperand(2);
909 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
910 case Instruction::ExtractElement:
911 Op0 = (OpNo == 0) ? Op : getOperand(0);
912 Op1 = (OpNo == 1) ? Op : getOperand(1);
913 return ConstantExpr::getExtractElement(Op0, Op1);
914 case Instruction::ShuffleVector:
915 Op0 = (OpNo == 0) ? Op : getOperand(0);
916 Op1 = (OpNo == 1) ? Op : getOperand(1);
917 Op2 = (OpNo == 2) ? Op : getOperand(2);
918 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
919 case Instruction::GetElementPtr: {
920 SmallVector<Constant*, 8> Ops;
921 Ops.resize(getNumOperands()-1);
922 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
923 Ops[i-1] = getOperand(i);
926 ConstantExpr::getGetElementPtr(Op, Ops,
927 cast<GEPOperator>(this)->isInBounds());
930 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
931 cast<GEPOperator>(this)->isInBounds());
934 assert(getNumOperands() == 2 && "Must be binary operator?");
935 Op0 = (OpNo == 0) ? Op : getOperand(0);
936 Op1 = (OpNo == 1) ? Op : getOperand(1);
937 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
941 /// getWithOperands - This returns the current constant expression with the
942 /// operands replaced with the specified values. The specified array must
943 /// have the same number of operands as our current one.
944 Constant *ConstantExpr::
945 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
946 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
947 bool AnyChange = Ty != getType();
948 for (unsigned i = 0; i != Ops.size(); ++i)
949 AnyChange |= Ops[i] != getOperand(i);
951 if (!AnyChange) // No operands changed, return self.
952 return const_cast<ConstantExpr*>(this);
954 switch (getOpcode()) {
955 case Instruction::Trunc:
956 case Instruction::ZExt:
957 case Instruction::SExt:
958 case Instruction::FPTrunc:
959 case Instruction::FPExt:
960 case Instruction::UIToFP:
961 case Instruction::SIToFP:
962 case Instruction::FPToUI:
963 case Instruction::FPToSI:
964 case Instruction::PtrToInt:
965 case Instruction::IntToPtr:
966 case Instruction::BitCast:
967 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
968 case Instruction::Select:
969 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
970 case Instruction::InsertElement:
971 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
972 case Instruction::ExtractElement:
973 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
974 case Instruction::ShuffleVector:
975 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
976 case Instruction::GetElementPtr:
978 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
979 cast<GEPOperator>(this)->isInBounds());
980 case Instruction::ICmp:
981 case Instruction::FCmp:
982 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
984 assert(getNumOperands() == 2 && "Must be binary operator?");
985 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
990 //===----------------------------------------------------------------------===//
991 // isValueValidForType implementations
993 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
994 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
995 if (Ty == Type::getInt1Ty(Ty->getContext()))
996 return Val == 0 || Val == 1;
998 return true; // always true, has to fit in largest type
999 uint64_t Max = (1ll << NumBits) - 1;
1003 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1004 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1005 if (Ty == Type::getInt1Ty(Ty->getContext()))
1006 return Val == 0 || Val == 1 || Val == -1;
1008 return true; // always true, has to fit in largest type
1009 int64_t Min = -(1ll << (NumBits-1));
1010 int64_t Max = (1ll << (NumBits-1)) - 1;
1011 return (Val >= Min && Val <= Max);
1014 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1015 // convert modifies in place, so make a copy.
1016 APFloat Val2 = APFloat(Val);
1018 switch (Ty->getTypeID()) {
1020 return false; // These can't be represented as floating point!
1022 // FIXME rounding mode needs to be more flexible
1023 case Type::HalfTyID: {
1024 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1026 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1029 case Type::FloatTyID: {
1030 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1032 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1035 case Type::DoubleTyID: {
1036 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1037 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1038 &Val2.getSemantics() == &APFloat::IEEEdouble)
1040 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1043 case Type::X86_FP80TyID:
1044 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1045 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1046 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1047 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1048 case Type::FP128TyID:
1049 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1050 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1051 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1052 &Val2.getSemantics() == &APFloat::IEEEquad;
1053 case Type::PPC_FP128TyID:
1054 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1055 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1056 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1057 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1062 //===----------------------------------------------------------------------===//
1063 // Factory Function Implementation
1065 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1066 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1067 "Cannot create an aggregate zero of non-aggregate type!");
1069 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1071 Entry = new ConstantAggregateZero(Ty);
1076 /// destroyConstant - Remove the constant from the constant table.
1078 void ConstantAggregateZero::destroyConstant() {
1079 getContext().pImpl->CAZConstants.erase(getType());
1080 destroyConstantImpl();
1083 /// destroyConstant - Remove the constant from the constant table...
1085 void ConstantArray::destroyConstant() {
1086 getType()->getContext().pImpl->ArrayConstants.remove(this);
1087 destroyConstantImpl();
1090 /// isString - This method returns true if the array is an array of i8, and
1091 /// if the elements of the array are all ConstantInt's.
1092 bool ConstantArray::isString() const {
1093 // Check the element type for i8...
1094 if (!getType()->getElementType()->isIntegerTy(8))
1096 // Check the elements to make sure they are all integers, not constant
1098 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1099 if (!isa<ConstantInt>(getOperand(i)))
1104 /// isCString - This method returns true if the array is a string (see
1105 /// isString) and it ends in a null byte \\0 and does not contains any other
1106 /// null bytes except its terminator.
1107 bool ConstantArray::isCString() const {
1108 // Check the element type for i8...
1109 if (!getType()->getElementType()->isIntegerTy(8))
1112 // Last element must be a null.
1113 if (!getOperand(getNumOperands()-1)->isNullValue())
1115 // Other elements must be non-null integers.
1116 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1117 if (!isa<ConstantInt>(getOperand(i)))
1119 if (getOperand(i)->isNullValue())
1126 /// convertToString - Helper function for getAsString() and getAsCString().
1127 static std::string convertToString(const User *U, unsigned len) {
1129 Result.reserve(len);
1130 for (unsigned i = 0; i != len; ++i)
1131 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1135 /// getAsString - If this array is isString(), then this method converts the
1136 /// array to an std::string and returns it. Otherwise, it asserts out.
1138 std::string ConstantArray::getAsString() const {
1139 assert(isString() && "Not a string!");
1140 return convertToString(this, getNumOperands());
1144 /// getAsCString - If this array is isCString(), then this method converts the
1145 /// array (without the trailing null byte) to an std::string and returns it.
1146 /// Otherwise, it asserts out.
1148 std::string ConstantArray::getAsCString() const {
1149 assert(isCString() && "Not a string!");
1150 return convertToString(this, getNumOperands() - 1);
1154 //---- ConstantStruct::get() implementation...
1157 // destroyConstant - Remove the constant from the constant table...
1159 void ConstantStruct::destroyConstant() {
1160 getType()->getContext().pImpl->StructConstants.remove(this);
1161 destroyConstantImpl();
1164 // destroyConstant - Remove the constant from the constant table...
1166 void ConstantVector::destroyConstant() {
1167 getType()->getContext().pImpl->VectorConstants.remove(this);
1168 destroyConstantImpl();
1171 /// getSplatValue - If this is a splat constant, where all of the
1172 /// elements have the same value, return that value. Otherwise return null.
1173 Constant *ConstantVector::getSplatValue() const {
1174 // Check out first element.
1175 Constant *Elt = getOperand(0);
1176 // Then make sure all remaining elements point to the same value.
1177 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1178 if (getOperand(I) != Elt)
1183 //---- ConstantPointerNull::get() implementation.
1186 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1187 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1189 Entry = new ConstantPointerNull(Ty);
1194 // destroyConstant - Remove the constant from the constant table...
1196 void ConstantPointerNull::destroyConstant() {
1197 getContext().pImpl->CPNConstants.erase(getType());
1198 // Free the constant and any dangling references to it.
1199 destroyConstantImpl();
1203 //---- UndefValue::get() implementation.
1206 UndefValue *UndefValue::get(Type *Ty) {
1207 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1209 Entry = new UndefValue(Ty);
1214 // destroyConstant - Remove the constant from the constant table.
1216 void UndefValue::destroyConstant() {
1217 // Free the constant and any dangling references to it.
1218 getContext().pImpl->UVConstants.erase(getType());
1219 destroyConstantImpl();
1222 //---- BlockAddress::get() implementation.
1225 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1226 assert(BB->getParent() != 0 && "Block must have a parent");
1227 return get(BB->getParent(), BB);
1230 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1232 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1234 BA = new BlockAddress(F, BB);
1236 assert(BA->getFunction() == F && "Basic block moved between functions");
1240 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1241 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1245 BB->AdjustBlockAddressRefCount(1);
1249 // destroyConstant - Remove the constant from the constant table.
1251 void BlockAddress::destroyConstant() {
1252 getFunction()->getType()->getContext().pImpl
1253 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1254 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1255 destroyConstantImpl();
1258 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1259 // This could be replacing either the Basic Block or the Function. In either
1260 // case, we have to remove the map entry.
1261 Function *NewF = getFunction();
1262 BasicBlock *NewBB = getBasicBlock();
1265 NewF = cast<Function>(To);
1267 NewBB = cast<BasicBlock>(To);
1269 // See if the 'new' entry already exists, if not, just update this in place
1270 // and return early.
1271 BlockAddress *&NewBA =
1272 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1274 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1276 // Remove the old entry, this can't cause the map to rehash (just a
1277 // tombstone will get added).
1278 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1281 setOperand(0, NewF);
1282 setOperand(1, NewBB);
1283 getBasicBlock()->AdjustBlockAddressRefCount(1);
1287 // Otherwise, I do need to replace this with an existing value.
1288 assert(NewBA != this && "I didn't contain From!");
1290 // Everyone using this now uses the replacement.
1291 replaceAllUsesWith(NewBA);
1296 //---- ConstantExpr::get() implementations.
1299 /// This is a utility function to handle folding of casts and lookup of the
1300 /// cast in the ExprConstants map. It is used by the various get* methods below.
1301 static inline Constant *getFoldedCast(
1302 Instruction::CastOps opc, Constant *C, Type *Ty) {
1303 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1304 // Fold a few common cases
1305 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1308 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1310 // Look up the constant in the table first to ensure uniqueness
1311 std::vector<Constant*> argVec(1, C);
1312 ExprMapKeyType Key(opc, argVec);
1314 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1317 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1318 Instruction::CastOps opc = Instruction::CastOps(oc);
1319 assert(Instruction::isCast(opc) && "opcode out of range");
1320 assert(C && Ty && "Null arguments to getCast");
1321 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1325 llvm_unreachable("Invalid cast opcode");
1326 case Instruction::Trunc: return getTrunc(C, Ty);
1327 case Instruction::ZExt: return getZExt(C, Ty);
1328 case Instruction::SExt: return getSExt(C, Ty);
1329 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1330 case Instruction::FPExt: return getFPExtend(C, Ty);
1331 case Instruction::UIToFP: return getUIToFP(C, Ty);
1332 case Instruction::SIToFP: return getSIToFP(C, Ty);
1333 case Instruction::FPToUI: return getFPToUI(C, Ty);
1334 case Instruction::FPToSI: return getFPToSI(C, Ty);
1335 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1336 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1337 case Instruction::BitCast: return getBitCast(C, Ty);
1341 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1342 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1343 return getBitCast(C, Ty);
1344 return getZExt(C, Ty);
1347 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1348 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1349 return getBitCast(C, Ty);
1350 return getSExt(C, Ty);
1353 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1354 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1355 return getBitCast(C, Ty);
1356 return getTrunc(C, Ty);
1359 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1360 assert(S->getType()->isPointerTy() && "Invalid cast");
1361 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1363 if (Ty->isIntegerTy())
1364 return getPtrToInt(S, Ty);
1365 return getBitCast(S, Ty);
1368 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1370 assert(C->getType()->isIntOrIntVectorTy() &&
1371 Ty->isIntOrIntVectorTy() && "Invalid cast");
1372 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1373 unsigned DstBits = Ty->getScalarSizeInBits();
1374 Instruction::CastOps opcode =
1375 (SrcBits == DstBits ? Instruction::BitCast :
1376 (SrcBits > DstBits ? Instruction::Trunc :
1377 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1378 return getCast(opcode, C, Ty);
1381 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1382 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1384 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1385 unsigned DstBits = Ty->getScalarSizeInBits();
1386 if (SrcBits == DstBits)
1387 return C; // Avoid a useless cast
1388 Instruction::CastOps opcode =
1389 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1390 return getCast(opcode, C, Ty);
1393 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1395 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1396 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1398 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1399 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1400 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1401 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1402 "SrcTy must be larger than DestTy for Trunc!");
1404 return getFoldedCast(Instruction::Trunc, C, Ty);
1407 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1409 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1410 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1412 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1413 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1414 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1415 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1416 "SrcTy must be smaller than DestTy for SExt!");
1418 return getFoldedCast(Instruction::SExt, C, Ty);
1421 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1423 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1424 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1426 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1427 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1428 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1429 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1430 "SrcTy must be smaller than DestTy for ZExt!");
1432 return getFoldedCast(Instruction::ZExt, C, Ty);
1435 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1437 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1438 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1440 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1441 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1442 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1443 "This is an illegal floating point truncation!");
1444 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1447 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1449 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1450 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1452 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1453 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1454 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1455 "This is an illegal floating point extension!");
1456 return getFoldedCast(Instruction::FPExt, C, Ty);
1459 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1461 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1462 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1464 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1465 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1466 "This is an illegal uint to floating point cast!");
1467 return getFoldedCast(Instruction::UIToFP, C, Ty);
1470 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1472 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1473 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1475 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1476 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1477 "This is an illegal sint to floating point cast!");
1478 return getFoldedCast(Instruction::SIToFP, C, Ty);
1481 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1483 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1484 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1486 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1487 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1488 "This is an illegal floating point to uint cast!");
1489 return getFoldedCast(Instruction::FPToUI, C, Ty);
1492 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1494 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1495 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1497 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1498 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1499 "This is an illegal floating point to sint cast!");
1500 return getFoldedCast(Instruction::FPToSI, C, Ty);
1503 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1504 assert(C->getType()->getScalarType()->isPointerTy() &&
1505 "PtrToInt source must be pointer or pointer vector");
1506 assert(DstTy->getScalarType()->isIntegerTy() &&
1507 "PtrToInt destination must be integer or integer vector");
1508 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1509 "Invalid cast between a different number of vector elements");
1510 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1513 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1514 assert(C->getType()->getScalarType()->isIntegerTy() &&
1515 "IntToPtr source must be integer or integer vector");
1516 assert(DstTy->getScalarType()->isPointerTy() &&
1517 "IntToPtr destination must be a pointer or pointer vector");
1518 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1519 "Invalid cast between a different number of vector elements");
1520 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1523 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1524 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1525 "Invalid constantexpr bitcast!");
1527 // It is common to ask for a bitcast of a value to its own type, handle this
1529 if (C->getType() == DstTy) return C;
1531 return getFoldedCast(Instruction::BitCast, C, DstTy);
1534 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1536 // Check the operands for consistency first.
1537 assert(Opcode >= Instruction::BinaryOpsBegin &&
1538 Opcode < Instruction::BinaryOpsEnd &&
1539 "Invalid opcode in binary constant expression");
1540 assert(C1->getType() == C2->getType() &&
1541 "Operand types in binary constant expression should match");
1545 case Instruction::Add:
1546 case Instruction::Sub:
1547 case Instruction::Mul:
1548 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1549 assert(C1->getType()->isIntOrIntVectorTy() &&
1550 "Tried to create an integer operation on a non-integer type!");
1552 case Instruction::FAdd:
1553 case Instruction::FSub:
1554 case Instruction::FMul:
1555 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1556 assert(C1->getType()->isFPOrFPVectorTy() &&
1557 "Tried to create a floating-point operation on a "
1558 "non-floating-point type!");
1560 case Instruction::UDiv:
1561 case Instruction::SDiv:
1562 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1563 assert(C1->getType()->isIntOrIntVectorTy() &&
1564 "Tried to create an arithmetic operation on a non-arithmetic type!");
1566 case Instruction::FDiv:
1567 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1568 assert(C1->getType()->isFPOrFPVectorTy() &&
1569 "Tried to create an arithmetic operation on a non-arithmetic type!");
1571 case Instruction::URem:
1572 case Instruction::SRem:
1573 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1574 assert(C1->getType()->isIntOrIntVectorTy() &&
1575 "Tried to create an arithmetic operation on a non-arithmetic type!");
1577 case Instruction::FRem:
1578 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1579 assert(C1->getType()->isFPOrFPVectorTy() &&
1580 "Tried to create an arithmetic operation on a non-arithmetic type!");
1582 case Instruction::And:
1583 case Instruction::Or:
1584 case Instruction::Xor:
1585 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1586 assert(C1->getType()->isIntOrIntVectorTy() &&
1587 "Tried to create a logical operation on a non-integral type!");
1589 case Instruction::Shl:
1590 case Instruction::LShr:
1591 case Instruction::AShr:
1592 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1593 assert(C1->getType()->isIntOrIntVectorTy() &&
1594 "Tried to create a shift operation on a non-integer type!");
1601 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1602 return FC; // Fold a few common cases.
1604 std::vector<Constant*> argVec(1, C1);
1605 argVec.push_back(C2);
1606 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1608 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1609 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1612 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1613 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1614 // Note that a non-inbounds gep is used, as null isn't within any object.
1615 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1616 Constant *GEP = getGetElementPtr(
1617 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1618 return getPtrToInt(GEP,
1619 Type::getInt64Ty(Ty->getContext()));
1622 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1623 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1624 // Note that a non-inbounds gep is used, as null isn't within any object.
1626 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1627 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1628 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1629 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1630 Constant *Indices[2] = { Zero, One };
1631 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1632 return getPtrToInt(GEP,
1633 Type::getInt64Ty(Ty->getContext()));
1636 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1637 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1641 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1642 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1643 // Note that a non-inbounds gep is used, as null isn't within any object.
1644 Constant *GEPIdx[] = {
1645 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1648 Constant *GEP = getGetElementPtr(
1649 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1650 return getPtrToInt(GEP,
1651 Type::getInt64Ty(Ty->getContext()));
1654 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1655 Constant *C1, Constant *C2) {
1656 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1658 switch (Predicate) {
1659 default: llvm_unreachable("Invalid CmpInst predicate");
1660 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1661 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1662 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1663 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1664 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1665 case CmpInst::FCMP_TRUE:
1666 return getFCmp(Predicate, C1, C2);
1668 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1669 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1670 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1671 case CmpInst::ICMP_SLE:
1672 return getICmp(Predicate, C1, C2);
1676 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1677 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1679 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1680 return SC; // Fold common cases
1682 std::vector<Constant*> argVec(3, C);
1685 ExprMapKeyType Key(Instruction::Select, argVec);
1687 LLVMContextImpl *pImpl = C->getContext().pImpl;
1688 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1691 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1693 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1694 return FC; // Fold a few common cases.
1696 // Get the result type of the getelementptr!
1697 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1698 assert(Ty && "GEP indices invalid!");
1699 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1700 Type *ReqTy = Ty->getPointerTo(AS);
1702 assert(C->getType()->isPointerTy() &&
1703 "Non-pointer type for constant GetElementPtr expression");
1704 // Look up the constant in the table first to ensure uniqueness
1705 std::vector<Constant*> ArgVec;
1706 ArgVec.reserve(1 + Idxs.size());
1707 ArgVec.push_back(C);
1708 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1709 ArgVec.push_back(cast<Constant>(Idxs[i]));
1710 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1711 InBounds ? GEPOperator::IsInBounds : 0);
1713 LLVMContextImpl *pImpl = C->getContext().pImpl;
1714 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1718 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1719 assert(LHS->getType() == RHS->getType());
1720 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1721 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1723 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1724 return FC; // Fold a few common cases...
1726 // Look up the constant in the table first to ensure uniqueness
1727 std::vector<Constant*> ArgVec;
1728 ArgVec.push_back(LHS);
1729 ArgVec.push_back(RHS);
1730 // Get the key type with both the opcode and predicate
1731 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1733 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1734 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1735 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1737 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1738 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1742 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1743 assert(LHS->getType() == RHS->getType());
1744 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1746 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1747 return FC; // Fold a few common cases...
1749 // Look up the constant in the table first to ensure uniqueness
1750 std::vector<Constant*> ArgVec;
1751 ArgVec.push_back(LHS);
1752 ArgVec.push_back(RHS);
1753 // Get the key type with both the opcode and predicate
1754 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1756 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1757 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1758 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1760 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1761 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1764 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1765 assert(Val->getType()->isVectorTy() &&
1766 "Tried to create extractelement operation on non-vector type!");
1767 assert(Idx->getType()->isIntegerTy(32) &&
1768 "Extractelement index must be i32 type!");
1770 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1771 return FC; // Fold a few common cases.
1773 // Look up the constant in the table first to ensure uniqueness
1774 std::vector<Constant*> ArgVec(1, Val);
1775 ArgVec.push_back(Idx);
1776 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1778 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1779 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1780 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1783 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1785 assert(Val->getType()->isVectorTy() &&
1786 "Tried to create insertelement operation on non-vector type!");
1787 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1788 && "Insertelement types must match!");
1789 assert(Idx->getType()->isIntegerTy(32) &&
1790 "Insertelement index must be i32 type!");
1792 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1793 return FC; // Fold a few common cases.
1794 // Look up the constant in the table first to ensure uniqueness
1795 std::vector<Constant*> ArgVec(1, Val);
1796 ArgVec.push_back(Elt);
1797 ArgVec.push_back(Idx);
1798 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1800 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1801 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1804 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1806 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1807 "Invalid shuffle vector constant expr operands!");
1809 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1810 return FC; // Fold a few common cases.
1812 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1813 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1814 Type *ShufTy = VectorType::get(EltTy, NElts);
1816 // Look up the constant in the table first to ensure uniqueness
1817 std::vector<Constant*> ArgVec(1, V1);
1818 ArgVec.push_back(V2);
1819 ArgVec.push_back(Mask);
1820 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1822 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1823 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1826 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1827 ArrayRef<unsigned> Idxs) {
1828 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1829 Idxs) == Val->getType() &&
1830 "insertvalue indices invalid!");
1831 assert(Agg->getType()->isFirstClassType() &&
1832 "Non-first-class type for constant insertvalue expression");
1833 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1834 assert(FC && "insertvalue constant expr couldn't be folded!");
1838 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1839 ArrayRef<unsigned> Idxs) {
1840 assert(Agg->getType()->isFirstClassType() &&
1841 "Tried to create extractelement operation on non-first-class type!");
1843 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1845 assert(ReqTy && "extractvalue indices invalid!");
1847 assert(Agg->getType()->isFirstClassType() &&
1848 "Non-first-class type for constant extractvalue expression");
1849 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1850 assert(FC && "ExtractValue constant expr couldn't be folded!");
1854 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1855 assert(C->getType()->isIntOrIntVectorTy() &&
1856 "Cannot NEG a nonintegral value!");
1857 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1861 Constant *ConstantExpr::getFNeg(Constant *C) {
1862 assert(C->getType()->isFPOrFPVectorTy() &&
1863 "Cannot FNEG a non-floating-point value!");
1864 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1867 Constant *ConstantExpr::getNot(Constant *C) {
1868 assert(C->getType()->isIntOrIntVectorTy() &&
1869 "Cannot NOT a nonintegral value!");
1870 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1873 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1874 bool HasNUW, bool HasNSW) {
1875 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1876 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1877 return get(Instruction::Add, C1, C2, Flags);
1880 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1881 return get(Instruction::FAdd, C1, C2);
1884 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1885 bool HasNUW, bool HasNSW) {
1886 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1887 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1888 return get(Instruction::Sub, C1, C2, Flags);
1891 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1892 return get(Instruction::FSub, C1, C2);
1895 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1896 bool HasNUW, bool HasNSW) {
1897 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1898 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1899 return get(Instruction::Mul, C1, C2, Flags);
1902 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1903 return get(Instruction::FMul, C1, C2);
1906 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1907 return get(Instruction::UDiv, C1, C2,
1908 isExact ? PossiblyExactOperator::IsExact : 0);
1911 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1912 return get(Instruction::SDiv, C1, C2,
1913 isExact ? PossiblyExactOperator::IsExact : 0);
1916 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1917 return get(Instruction::FDiv, C1, C2);
1920 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1921 return get(Instruction::URem, C1, C2);
1924 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1925 return get(Instruction::SRem, C1, C2);
1928 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1929 return get(Instruction::FRem, C1, C2);
1932 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1933 return get(Instruction::And, C1, C2);
1936 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1937 return get(Instruction::Or, C1, C2);
1940 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1941 return get(Instruction::Xor, C1, C2);
1944 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1945 bool HasNUW, bool HasNSW) {
1946 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1947 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1948 return get(Instruction::Shl, C1, C2, Flags);
1951 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1952 return get(Instruction::LShr, C1, C2,
1953 isExact ? PossiblyExactOperator::IsExact : 0);
1956 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1957 return get(Instruction::AShr, C1, C2,
1958 isExact ? PossiblyExactOperator::IsExact : 0);
1961 // destroyConstant - Remove the constant from the constant table...
1963 void ConstantExpr::destroyConstant() {
1964 getType()->getContext().pImpl->ExprConstants.remove(this);
1965 destroyConstantImpl();
1968 const char *ConstantExpr::getOpcodeName() const {
1969 return Instruction::getOpcodeName(getOpcode());
1974 GetElementPtrConstantExpr::
1975 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1977 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1978 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1979 - (IdxList.size()+1), IdxList.size()+1) {
1981 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1982 OperandList[i+1] = IdxList[i];
1985 //===----------------------------------------------------------------------===//
1986 // ConstantData* implementations
1988 void ConstantDataArray::anchor() {}
1989 void ConstantDataVector::anchor() {}
1991 /// getElementType - Return the element type of the array/vector.
1992 Type *ConstantDataSequential::getElementType() const {
1993 return getType()->getElementType();
1996 StringRef ConstantDataSequential::getRawDataValues() const {
1997 return StringRef(DataElements, getNumElements()*getElementByteSize());
2000 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2001 /// formed with a vector or array of the specified element type.
2002 /// ConstantDataArray only works with normal float and int types that are
2003 /// stored densely in memory, not with things like i42 or x86_f80.
2004 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2005 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2006 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2007 switch (IT->getBitWidth()) {
2019 /// getNumElements - Return the number of elements in the array or vector.
2020 unsigned ConstantDataSequential::getNumElements() const {
2021 return getType()->getNumElements();
2025 /// getElementByteSize - Return the size in bytes of the elements in the data.
2026 uint64_t ConstantDataSequential::getElementByteSize() const {
2027 return getElementType()->getPrimitiveSizeInBits()/8;
2030 /// getElementPointer - Return the start of the specified element.
2031 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2032 assert(Elt < getNumElements() && "Invalid Elt");
2033 return DataElements+Elt*getElementByteSize();
2037 /// isAllZeros - return true if the array is empty or all zeros.
2038 static bool isAllZeros(StringRef Arr) {
2039 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2045 /// getImpl - This is the underlying implementation of all of the
2046 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2047 /// the correct element type. We take the bytes in as an StringRef because
2048 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2049 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2050 assert(isElementTypeCompatible(cast<SequentialType>(Ty)->getElementType()));
2051 // If the elements are all zero, return a CAZ, which is more dense.
2052 if (isAllZeros(Elements))
2053 return ConstantAggregateZero::get(Ty);
2055 // Do a lookup to see if we have already formed one of these.
2056 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2057 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2059 // The bucket can point to a linked list of different CDS's that have the same
2060 // body but different types. For example, 0,0,0,1 could be a 4 element array
2061 // of i8, or a 1-element array of i32. They'll both end up in the same
2062 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2063 ConstantDataSequential **Entry = &Slot.getValue();
2064 for (ConstantDataSequential *Node = *Entry; Node != 0;
2065 Entry = &Node->Next, Node = *Entry)
2066 if (Node->getType() == Ty)
2069 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2071 if (isa<ArrayType>(Ty))
2072 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2074 assert(isa<VectorType>(Ty));
2075 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2078 void ConstantDataSequential::destroyConstant() {
2079 // Remove the constant from the StringMap.
2080 StringMap<ConstantDataSequential*> &CDSConstants =
2081 getType()->getContext().pImpl->CDSConstants;
2083 StringMap<ConstantDataSequential*>::iterator Slot =
2084 CDSConstants.find(getRawDataValues());
2086 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2088 ConstantDataSequential **Entry = &Slot->getValue();
2090 // Remove the entry from the hash table.
2091 if ((*Entry)->Next == 0) {
2092 // If there is only one value in the bucket (common case) it must be this
2093 // entry, and removing the entry should remove the bucket completely.
2094 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2095 getContext().pImpl->CDSConstants.erase(Slot);
2097 // Otherwise, there are multiple entries linked off the bucket, unlink the
2098 // node we care about but keep the bucket around.
2099 for (ConstantDataSequential *Node = *Entry; ;
2100 Entry = &Node->Next, Node = *Entry) {
2101 assert(Node && "Didn't find entry in its uniquing hash table!");
2102 // If we found our entry, unlink it from the list and we're done.
2104 *Entry = Node->Next;
2110 // If we were part of a list, make sure that we don't delete the list that is
2111 // still owned by the uniquing map.
2114 // Finally, actually delete it.
2115 destroyConstantImpl();
2118 /// get() constructors - Return a constant with array type with an element
2119 /// count and element type matching the ArrayRef passed in. Note that this
2120 /// can return a ConstantAggregateZero object.
2121 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2122 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2123 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2125 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2126 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2127 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2129 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2130 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2131 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2133 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2134 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2135 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2137 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2138 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2139 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2141 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2142 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2143 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2146 /// getString - This method constructs a CDS and initializes it with a text
2147 /// string. The default behavior (AddNull==true) causes a null terminator to
2148 /// be placed at the end of the array (increasing the length of the string by
2149 /// one more than the StringRef would normally indicate. Pass AddNull=false
2150 /// to disable this behavior.
2151 Constant *ConstantDataArray::getString(LLVMContext &Context,
2152 StringRef Str, bool AddNull) {
2154 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2156 SmallVector<uint8_t, 64> ElementVals;
2157 ElementVals.append(Str.begin(), Str.end());
2158 ElementVals.push_back(0);
2159 return get(Context, ElementVals);
2162 /// get() constructors - Return a constant with vector type with an element
2163 /// count and element type matching the ArrayRef passed in. Note that this
2164 /// can return a ConstantAggregateZero object.
2165 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2166 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2167 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2169 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2170 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2171 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2173 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2174 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2175 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2177 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2178 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2179 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2181 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2182 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2183 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2185 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2186 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2187 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2190 /// getElementAsInteger - If this is a sequential container of integers (of
2191 /// any size), return the specified element in the low bits of a uint64_t.
2192 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2193 assert(isa<IntegerType>(getElementType()) &&
2194 "Accessor can only be used when element is an integer");
2195 const char *EltPtr = getElementPointer(Elt);
2197 // The data is stored in host byte order, make sure to cast back to the right
2198 // type to load with the right endianness.
2199 switch (cast<IntegerType>(getElementType())->getBitWidth()) {
2200 default: assert(0 && "Invalid bitwidth for CDS");
2201 case 8: return *(uint8_t*)EltPtr;
2202 case 16: return *(uint16_t*)EltPtr;
2203 case 32: return *(uint32_t*)EltPtr;
2204 case 64: return *(uint64_t*)EltPtr;
2208 /// getElementAsAPFloat - If this is a sequential container of floating point
2209 /// type, return the specified element as an APFloat.
2210 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2211 const char *EltPtr = getElementPointer(Elt);
2213 switch (getElementType()->getTypeID()) {
2214 default: assert("Accessor can only be used when element is float/double!");
2215 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2216 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2220 /// getElementAsFloat - If this is an sequential container of floats, return
2221 /// the specified element as a float.
2222 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2223 assert(getElementType()->isFloatTy() &&
2224 "Accessor can only be used when element is a 'float'");
2225 return *(float*)getElementPointer(Elt);
2228 /// getElementAsDouble - If this is an sequential container of doubles, return
2229 /// the specified element as a float.
2230 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2231 assert(getElementType()->isDoubleTy() &&
2232 "Accessor can only be used when element is a 'float'");
2233 return *(double*)getElementPointer(Elt);
2236 /// getElementAsConstant - Return a Constant for a specified index's element.
2237 /// Note that this has to compute a new constant to return, so it isn't as
2238 /// efficient as getElementAsInteger/Float/Double.
2239 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2240 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2241 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2243 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2246 /// isString - This method returns true if this is an array of i8.
2247 bool ConstantDataSequential::isString() const {
2248 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2251 /// isCString - This method returns true if the array "isString", ends with a
2252 /// nul byte, and does not contains any other nul bytes.
2253 bool ConstantDataSequential::isCString() const {
2257 StringRef Str = getAsString();
2259 // The last value must be nul.
2260 if (Str.back() != 0) return false;
2262 // Other elements must be non-nul.
2263 return Str.drop_back().find(0) == StringRef::npos;
2267 //===----------------------------------------------------------------------===//
2268 // replaceUsesOfWithOnConstant implementations
2270 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2271 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2274 /// Note that we intentionally replace all uses of From with To here. Consider
2275 /// a large array that uses 'From' 1000 times. By handling this case all here,
2276 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2277 /// single invocation handles all 1000 uses. Handling them one at a time would
2278 /// work, but would be really slow because it would have to unique each updated
2281 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2283 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2284 Constant *ToC = cast<Constant>(To);
2286 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2288 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2289 Lookup.first.first = cast<ArrayType>(getType());
2290 Lookup.second = this;
2292 std::vector<Constant*> &Values = Lookup.first.second;
2293 Values.reserve(getNumOperands()); // Build replacement array.
2295 // Fill values with the modified operands of the constant array. Also,
2296 // compute whether this turns into an all-zeros array.
2297 bool isAllZeros = false;
2298 unsigned NumUpdated = 0;
2299 if (!ToC->isNullValue()) {
2300 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2301 Constant *Val = cast<Constant>(O->get());
2306 Values.push_back(Val);
2310 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2311 Constant *Val = cast<Constant>(O->get());
2316 Values.push_back(Val);
2317 if (isAllZeros) isAllZeros = Val->isNullValue();
2321 Constant *Replacement = 0;
2323 Replacement = ConstantAggregateZero::get(getType());
2325 // Check to see if we have this array type already.
2327 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2328 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2331 Replacement = I->second;
2333 // Okay, the new shape doesn't exist in the system yet. Instead of
2334 // creating a new constant array, inserting it, replaceallusesof'ing the
2335 // old with the new, then deleting the old... just update the current one
2337 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2339 // Update to the new value. Optimize for the case when we have a single
2340 // operand that we're changing, but handle bulk updates efficiently.
2341 if (NumUpdated == 1) {
2342 unsigned OperandToUpdate = U - OperandList;
2343 assert(getOperand(OperandToUpdate) == From &&
2344 "ReplaceAllUsesWith broken!");
2345 setOperand(OperandToUpdate, ToC);
2347 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2348 if (getOperand(i) == From)
2355 // Otherwise, I do need to replace this with an existing value.
2356 assert(Replacement != this && "I didn't contain From!");
2358 // Everyone using this now uses the replacement.
2359 replaceAllUsesWith(Replacement);
2361 // Delete the old constant!
2365 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2367 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2368 Constant *ToC = cast<Constant>(To);
2370 unsigned OperandToUpdate = U-OperandList;
2371 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2373 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2374 Lookup.first.first = cast<StructType>(getType());
2375 Lookup.second = this;
2376 std::vector<Constant*> &Values = Lookup.first.second;
2377 Values.reserve(getNumOperands()); // Build replacement struct.
2380 // Fill values with the modified operands of the constant struct. Also,
2381 // compute whether this turns into an all-zeros struct.
2382 bool isAllZeros = false;
2383 if (!ToC->isNullValue()) {
2384 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2385 Values.push_back(cast<Constant>(O->get()));
2388 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2389 Constant *Val = cast<Constant>(O->get());
2390 Values.push_back(Val);
2391 if (isAllZeros) isAllZeros = Val->isNullValue();
2394 Values[OperandToUpdate] = ToC;
2396 LLVMContextImpl *pImpl = getContext().pImpl;
2398 Constant *Replacement = 0;
2400 Replacement = ConstantAggregateZero::get(getType());
2402 // Check to see if we have this struct type already.
2404 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2405 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2408 Replacement = I->second;
2410 // Okay, the new shape doesn't exist in the system yet. Instead of
2411 // creating a new constant struct, inserting it, replaceallusesof'ing the
2412 // old with the new, then deleting the old... just update the current one
2414 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2416 // Update to the new value.
2417 setOperand(OperandToUpdate, ToC);
2422 assert(Replacement != this && "I didn't contain From!");
2424 // Everyone using this now uses the replacement.
2425 replaceAllUsesWith(Replacement);
2427 // Delete the old constant!
2431 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2433 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2435 std::vector<Constant*> Values;
2436 Values.reserve(getNumOperands()); // Build replacement array...
2437 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2438 Constant *Val = getOperand(i);
2439 if (Val == From) Val = cast<Constant>(To);
2440 Values.push_back(Val);
2443 Constant *Replacement = get(Values);
2444 assert(Replacement != this && "I didn't contain From!");
2446 // Everyone using this now uses the replacement.
2447 replaceAllUsesWith(Replacement);
2449 // Delete the old constant!
2453 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2455 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2456 Constant *To = cast<Constant>(ToV);
2458 Constant *Replacement = 0;
2459 if (getOpcode() == Instruction::GetElementPtr) {
2460 SmallVector<Constant*, 8> Indices;
2461 Constant *Pointer = getOperand(0);
2462 Indices.reserve(getNumOperands()-1);
2463 if (Pointer == From) Pointer = To;
2465 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2466 Constant *Val = getOperand(i);
2467 if (Val == From) Val = To;
2468 Indices.push_back(Val);
2470 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2471 cast<GEPOperator>(this)->isInBounds());
2472 } else if (getOpcode() == Instruction::ExtractValue) {
2473 Constant *Agg = getOperand(0);
2474 if (Agg == From) Agg = To;
2476 ArrayRef<unsigned> Indices = getIndices();
2477 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2478 } else if (getOpcode() == Instruction::InsertValue) {
2479 Constant *Agg = getOperand(0);
2480 Constant *Val = getOperand(1);
2481 if (Agg == From) Agg = To;
2482 if (Val == From) Val = To;
2484 ArrayRef<unsigned> Indices = getIndices();
2485 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2486 } else if (isCast()) {
2487 assert(getOperand(0) == From && "Cast only has one use!");
2488 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2489 } else if (getOpcode() == Instruction::Select) {
2490 Constant *C1 = getOperand(0);
2491 Constant *C2 = getOperand(1);
2492 Constant *C3 = getOperand(2);
2493 if (C1 == From) C1 = To;
2494 if (C2 == From) C2 = To;
2495 if (C3 == From) C3 = To;
2496 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2497 } else if (getOpcode() == Instruction::ExtractElement) {
2498 Constant *C1 = getOperand(0);
2499 Constant *C2 = getOperand(1);
2500 if (C1 == From) C1 = To;
2501 if (C2 == From) C2 = To;
2502 Replacement = ConstantExpr::getExtractElement(C1, C2);
2503 } else if (getOpcode() == Instruction::InsertElement) {
2504 Constant *C1 = getOperand(0);
2505 Constant *C2 = getOperand(1);
2506 Constant *C3 = getOperand(1);
2507 if (C1 == From) C1 = To;
2508 if (C2 == From) C2 = To;
2509 if (C3 == From) C3 = To;
2510 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2511 } else if (getOpcode() == Instruction::ShuffleVector) {
2512 Constant *C1 = getOperand(0);
2513 Constant *C2 = getOperand(1);
2514 Constant *C3 = getOperand(2);
2515 if (C1 == From) C1 = To;
2516 if (C2 == From) C2 = To;
2517 if (C3 == From) C3 = To;
2518 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2519 } else if (isCompare()) {
2520 Constant *C1 = getOperand(0);
2521 Constant *C2 = getOperand(1);
2522 if (C1 == From) C1 = To;
2523 if (C2 == From) C2 = To;
2524 if (getOpcode() == Instruction::ICmp)
2525 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2527 assert(getOpcode() == Instruction::FCmp);
2528 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2530 } else if (getNumOperands() == 2) {
2531 Constant *C1 = getOperand(0);
2532 Constant *C2 = getOperand(1);
2533 if (C1 == From) C1 = To;
2534 if (C2 == From) C2 = To;
2535 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2537 llvm_unreachable("Unknown ConstantExpr type!");
2540 assert(Replacement != this && "I didn't contain From!");
2542 // Everyone using this now uses the replacement.
2543 replaceAllUsesWith(Replacement);
2545 // Delete the old constant!