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::getSplat(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 VectorType *VTy = cast<VectorType>(Ty);
149 return ConstantVector::getSplat(VTy->getNumElements(),
150 getAllOnesValue(VTy->getElementType()));
153 /// getAggregateElement - For aggregates (struct/array/vector) return the
154 /// constant that corresponds to the specified element if possible, or null if
155 /// not. This can return null if the element index is a ConstantExpr, or if
156 /// 'this' is a constant expr.
157 Constant *Constant::getAggregateElement(unsigned Elt) const {
158 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
159 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
161 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
162 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
164 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
165 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
167 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
168 return CAZ->getElementValue(Elt);
170 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
171 return UV->getElementValue(Elt);
173 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
174 return CDS->getElementAsConstant(Elt);
178 Constant *Constant::getAggregateElement(Constant *Elt) const {
179 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
180 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
181 return getAggregateElement(CI->getZExtValue());
186 void Constant::destroyConstantImpl() {
187 // When a Constant is destroyed, there may be lingering
188 // references to the constant by other constants in the constant pool. These
189 // constants are implicitly dependent on the module that is being deleted,
190 // but they don't know that. Because we only find out when the CPV is
191 // deleted, we must now notify all of our users (that should only be
192 // Constants) that they are, in fact, invalid now and should be deleted.
194 while (!use_empty()) {
195 Value *V = use_back();
196 #ifndef NDEBUG // Only in -g mode...
197 if (!isa<Constant>(V)) {
198 dbgs() << "While deleting: " << *this
199 << "\n\nUse still stuck around after Def is destroyed: "
203 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
204 cast<Constant>(V)->destroyConstant();
206 // The constant should remove itself from our use list...
207 assert((use_empty() || use_back() != V) && "Constant not removed!");
210 // Value has no outstanding references it is safe to delete it now...
214 /// canTrap - Return true if evaluation of this constant could trap. This is
215 /// true for things like constant expressions that could divide by zero.
216 bool Constant::canTrap() const {
217 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
218 // The only thing that could possibly trap are constant exprs.
219 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
220 if (!CE) return false;
222 // ConstantExpr traps if any operands can trap.
223 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
224 if (CE->getOperand(i)->canTrap())
227 // Otherwise, only specific operations can trap.
228 switch (CE->getOpcode()) {
231 case Instruction::UDiv:
232 case Instruction::SDiv:
233 case Instruction::FDiv:
234 case Instruction::URem:
235 case Instruction::SRem:
236 case Instruction::FRem:
237 // Div and rem can trap if the RHS is not known to be non-zero.
238 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
244 /// isConstantUsed - Return true if the constant has users other than constant
245 /// exprs and other dangling things.
246 bool Constant::isConstantUsed() const {
247 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
248 const Constant *UC = dyn_cast<Constant>(*UI);
249 if (UC == 0 || isa<GlobalValue>(UC))
252 if (UC->isConstantUsed())
260 /// getRelocationInfo - This method classifies the entry according to
261 /// whether or not it may generate a relocation entry. This must be
262 /// conservative, so if it might codegen to a relocatable entry, it should say
263 /// so. The return values are:
265 /// NoRelocation: This constant pool entry is guaranteed to never have a
266 /// relocation applied to it (because it holds a simple constant like
268 /// LocalRelocation: This entry has relocations, but the entries are
269 /// guaranteed to be resolvable by the static linker, so the dynamic
270 /// linker will never see them.
271 /// GlobalRelocations: This entry may have arbitrary relocations.
273 /// FIXME: This really should not be in VMCore.
274 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
275 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
276 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
277 return LocalRelocation; // Local to this file/library.
278 return GlobalRelocations; // Global reference.
281 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
282 return BA->getFunction()->getRelocationInfo();
284 // While raw uses of blockaddress need to be relocated, differences between
285 // two of them don't when they are for labels in the same function. This is a
286 // common idiom when creating a table for the indirect goto extension, so we
287 // handle it efficiently here.
288 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
289 if (CE->getOpcode() == Instruction::Sub) {
290 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
291 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
293 LHS->getOpcode() == Instruction::PtrToInt &&
294 RHS->getOpcode() == Instruction::PtrToInt &&
295 isa<BlockAddress>(LHS->getOperand(0)) &&
296 isa<BlockAddress>(RHS->getOperand(0)) &&
297 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
298 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
302 PossibleRelocationsTy Result = NoRelocation;
303 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
304 Result = std::max(Result,
305 cast<Constant>(getOperand(i))->getRelocationInfo());
311 /// getVectorElements - This method, which is only valid on constant of vector
312 /// type, returns the elements of the vector in the specified smallvector.
313 /// This handles breaking down a vector undef into undef elements, etc. For
314 /// constant exprs and other cases we can't handle, we return an empty vector.
315 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
316 assert(getType()->isVectorTy() && "Not a vector constant!");
318 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
319 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
320 Elts.push_back(CV->getOperand(i));
324 VectorType *VT = cast<VectorType>(getType());
325 if (isa<ConstantAggregateZero>(this)) {
326 Elts.assign(VT->getNumElements(),
327 Constant::getNullValue(VT->getElementType()));
331 if (isa<UndefValue>(this)) {
332 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
336 // Unknown type, must be constant expr etc.
340 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
341 /// it. This involves recursively eliminating any dead users of the
343 static bool removeDeadUsersOfConstant(const Constant *C) {
344 if (isa<GlobalValue>(C)) return false; // Cannot remove this
346 while (!C->use_empty()) {
347 const Constant *User = dyn_cast<Constant>(C->use_back());
348 if (!User) return false; // Non-constant usage;
349 if (!removeDeadUsersOfConstant(User))
350 return false; // Constant wasn't dead
353 const_cast<Constant*>(C)->destroyConstant();
358 /// removeDeadConstantUsers - If there are any dead constant users dangling
359 /// off of this constant, remove them. This method is useful for clients
360 /// that want to check to see if a global is unused, but don't want to deal
361 /// with potentially dead constants hanging off of the globals.
362 void Constant::removeDeadConstantUsers() const {
363 Value::const_use_iterator I = use_begin(), E = use_end();
364 Value::const_use_iterator LastNonDeadUser = E;
366 const Constant *User = dyn_cast<Constant>(*I);
373 if (!removeDeadUsersOfConstant(User)) {
374 // If the constant wasn't dead, remember that this was the last live use
375 // and move on to the next constant.
381 // If the constant was dead, then the iterator is invalidated.
382 if (LastNonDeadUser == E) {
394 //===----------------------------------------------------------------------===//
396 //===----------------------------------------------------------------------===//
398 void ConstantInt::anchor() { }
400 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
401 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
402 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
405 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
406 LLVMContextImpl *pImpl = Context.pImpl;
407 if (!pImpl->TheTrueVal)
408 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
409 return pImpl->TheTrueVal;
412 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
413 LLVMContextImpl *pImpl = Context.pImpl;
414 if (!pImpl->TheFalseVal)
415 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
416 return pImpl->TheFalseVal;
419 Constant *ConstantInt::getTrue(Type *Ty) {
420 VectorType *VTy = dyn_cast<VectorType>(Ty);
422 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
423 return ConstantInt::getTrue(Ty->getContext());
425 assert(VTy->getElementType()->isIntegerTy(1) &&
426 "True must be vector of i1 or i1.");
427 return ConstantVector::getSplat(VTy->getNumElements(),
428 ConstantInt::getTrue(Ty->getContext()));
431 Constant *ConstantInt::getFalse(Type *Ty) {
432 VectorType *VTy = dyn_cast<VectorType>(Ty);
434 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
435 return ConstantInt::getFalse(Ty->getContext());
437 assert(VTy->getElementType()->isIntegerTy(1) &&
438 "False must be vector of i1 or i1.");
439 return ConstantVector::getSplat(VTy->getNumElements(),
440 ConstantInt::getFalse(Ty->getContext()));
444 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
445 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
446 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
447 // compare APInt's of different widths, which would violate an APInt class
448 // invariant which generates an assertion.
449 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
450 // Get the corresponding integer type for the bit width of the value.
451 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
452 // get an existing value or the insertion position
453 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
454 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
455 if (!Slot) Slot = new ConstantInt(ITy, V);
459 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
460 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
462 // For vectors, broadcast the value.
463 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
464 return ConstantVector::getSplat(VTy->getNumElements(), C);
469 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
471 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
474 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
475 return get(Ty, V, true);
478 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
479 return get(Ty, V, true);
482 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
483 ConstantInt *C = get(Ty->getContext(), V);
484 assert(C->getType() == Ty->getScalarType() &&
485 "ConstantInt type doesn't match the type implied by its value!");
487 // For vectors, broadcast the value.
488 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
489 return ConstantVector::getSplat(VTy->getNumElements(), C);
494 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
496 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
499 //===----------------------------------------------------------------------===//
501 //===----------------------------------------------------------------------===//
503 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
505 return &APFloat::IEEEhalf;
507 return &APFloat::IEEEsingle;
508 if (Ty->isDoubleTy())
509 return &APFloat::IEEEdouble;
510 if (Ty->isX86_FP80Ty())
511 return &APFloat::x87DoubleExtended;
512 else if (Ty->isFP128Ty())
513 return &APFloat::IEEEquad;
515 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
516 return &APFloat::PPCDoubleDouble;
519 void ConstantFP::anchor() { }
521 /// get() - This returns a constant fp for the specified value in the
522 /// specified type. This should only be used for simple constant values like
523 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
524 Constant *ConstantFP::get(Type* Ty, double V) {
525 LLVMContext &Context = Ty->getContext();
529 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
530 APFloat::rmNearestTiesToEven, &ignored);
531 Constant *C = get(Context, FV);
533 // For vectors, broadcast the value.
534 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
535 return ConstantVector::getSplat(VTy->getNumElements(), C);
541 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
542 LLVMContext &Context = Ty->getContext();
544 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
545 Constant *C = get(Context, FV);
547 // For vectors, broadcast the value.
548 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
549 return ConstantVector::getSplat(VTy->getNumElements(), C);
555 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
556 LLVMContext &Context = Ty->getContext();
557 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
559 return get(Context, apf);
563 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
564 Type *ScalarTy = Ty->getScalarType();
565 if (ScalarTy->isFloatingPointTy()) {
566 Constant *C = getNegativeZero(ScalarTy);
567 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
568 return ConstantVector::getSplat(VTy->getNumElements(), C);
572 return Constant::getNullValue(Ty);
576 // ConstantFP accessors.
577 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
578 DenseMapAPFloatKeyInfo::KeyTy Key(V);
580 LLVMContextImpl* pImpl = Context.pImpl;
582 ConstantFP *&Slot = pImpl->FPConstants[Key];
586 if (&V.getSemantics() == &APFloat::IEEEhalf)
587 Ty = Type::getHalfTy(Context);
588 else if (&V.getSemantics() == &APFloat::IEEEsingle)
589 Ty = Type::getFloatTy(Context);
590 else if (&V.getSemantics() == &APFloat::IEEEdouble)
591 Ty = Type::getDoubleTy(Context);
592 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
593 Ty = Type::getX86_FP80Ty(Context);
594 else if (&V.getSemantics() == &APFloat::IEEEquad)
595 Ty = Type::getFP128Ty(Context);
597 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
598 "Unknown FP format");
599 Ty = Type::getPPC_FP128Ty(Context);
601 Slot = new ConstantFP(Ty, V);
607 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
608 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
609 return ConstantFP::get(Ty->getContext(),
610 APFloat::getInf(Semantics, Negative));
613 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
614 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
615 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
619 bool ConstantFP::isExactlyValue(const APFloat &V) const {
620 return Val.bitwiseIsEqual(V);
623 //===----------------------------------------------------------------------===//
624 // ConstantAggregateZero Implementation
625 //===----------------------------------------------------------------------===//
627 /// getSequentialElement - If this CAZ has array or vector type, return a zero
628 /// with the right element type.
629 Constant *ConstantAggregateZero::getSequentialElement() const {
630 return Constant::getNullValue(getType()->getSequentialElementType());
633 /// getStructElement - If this CAZ has struct type, return a zero with the
634 /// right element type for the specified element.
635 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
636 return Constant::getNullValue(getType()->getStructElementType(Elt));
639 /// getElementValue - Return a zero of the right value for the specified GEP
640 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
641 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
642 if (isa<SequentialType>(getType()))
643 return getSequentialElement();
644 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
647 /// getElementValue - Return a zero of the right value for the specified GEP
649 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
650 if (isa<SequentialType>(getType()))
651 return getSequentialElement();
652 return getStructElement(Idx);
656 //===----------------------------------------------------------------------===//
657 // UndefValue Implementation
658 //===----------------------------------------------------------------------===//
660 /// getSequentialElement - If this undef has array or vector type, return an
661 /// undef with the right element type.
662 UndefValue *UndefValue::getSequentialElement() const {
663 return UndefValue::get(getType()->getSequentialElementType());
666 /// getStructElement - If this undef has struct type, return a zero with the
667 /// right element type for the specified element.
668 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
669 return UndefValue::get(getType()->getStructElementType(Elt));
672 /// getElementValue - Return an undef of the right value for the specified GEP
673 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
674 UndefValue *UndefValue::getElementValue(Constant *C) const {
675 if (isa<SequentialType>(getType()))
676 return getSequentialElement();
677 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
680 /// getElementValue - Return an undef of the right value for the specified GEP
682 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
683 if (isa<SequentialType>(getType()))
684 return getSequentialElement();
685 return getStructElement(Idx);
690 //===----------------------------------------------------------------------===//
691 // ConstantXXX Classes
692 //===----------------------------------------------------------------------===//
695 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
696 : Constant(T, ConstantArrayVal,
697 OperandTraits<ConstantArray>::op_end(this) - V.size(),
699 assert(V.size() == T->getNumElements() &&
700 "Invalid initializer vector for constant array");
701 for (unsigned i = 0, e = V.size(); i != e; ++i)
702 assert(V[i]->getType() == T->getElementType() &&
703 "Initializer for array element doesn't match array element type!");
704 std::copy(V.begin(), V.end(), op_begin());
707 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
708 for (unsigned i = 0, e = V.size(); i != e; ++i) {
709 assert(V[i]->getType() == Ty->getElementType() &&
710 "Wrong type in array element initializer");
712 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
713 // If this is an all-zero array, return a ConstantAggregateZero object
716 if (!C->isNullValue())
717 return pImpl->ArrayConstants.getOrCreate(Ty, V);
719 for (unsigned i = 1, e = V.size(); i != e; ++i)
721 return pImpl->ArrayConstants.getOrCreate(Ty, V);
724 return ConstantAggregateZero::get(Ty);
727 /// ConstantArray::get(const string&) - Return an array that is initialized to
728 /// contain the specified string. If length is zero then a null terminator is
729 /// added to the specified string so that it may be used in a natural way.
730 /// Otherwise, the length parameter specifies how much of the string to use
731 /// and it won't be null terminated.
733 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
735 std::vector<Constant*> ElementVals;
736 ElementVals.reserve(Str.size() + size_t(AddNull));
737 for (unsigned i = 0; i < Str.size(); ++i)
738 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
740 // Add a null terminator to the string...
742 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
744 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
745 return get(ATy, ElementVals);
748 /// getTypeForElements - Return an anonymous struct type to use for a constant
749 /// with the specified set of elements. The list must not be empty.
750 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
751 ArrayRef<Constant*> V,
753 SmallVector<Type*, 16> EltTypes;
754 for (unsigned i = 0, e = V.size(); i != e; ++i)
755 EltTypes.push_back(V[i]->getType());
757 return StructType::get(Context, EltTypes, Packed);
761 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
764 "ConstantStruct::getTypeForElements cannot be called on empty list");
765 return getTypeForElements(V[0]->getContext(), V, Packed);
769 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
770 : Constant(T, ConstantStructVal,
771 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
773 assert(V.size() == T->getNumElements() &&
774 "Invalid initializer vector for constant structure");
775 for (unsigned i = 0, e = V.size(); i != e; ++i)
776 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
777 "Initializer for struct element doesn't match struct element type!");
778 std::copy(V.begin(), V.end(), op_begin());
781 // ConstantStruct accessors.
782 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
783 // Create a ConstantAggregateZero value if all elements are zeros.
784 for (unsigned i = 0, e = V.size(); i != e; ++i)
785 if (!V[i]->isNullValue())
786 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
788 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
789 "Incorrect # elements specified to ConstantStruct::get");
790 return ConstantAggregateZero::get(ST);
793 Constant *ConstantStruct::get(StructType *T, ...) {
795 SmallVector<Constant*, 8> Values;
797 while (Constant *Val = va_arg(ap, llvm::Constant*))
798 Values.push_back(Val);
800 return get(T, Values);
803 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
804 : Constant(T, ConstantVectorVal,
805 OperandTraits<ConstantVector>::op_end(this) - V.size(),
807 for (size_t i = 0, e = V.size(); i != e; i++)
808 assert(V[i]->getType() == T->getElementType() &&
809 "Initializer for vector element doesn't match vector element type!");
810 std::copy(V.begin(), V.end(), op_begin());
813 // ConstantVector accessors.
814 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
815 assert(!V.empty() && "Vectors can't be empty");
816 VectorType *T = VectorType::get(V.front()->getType(), V.size());
817 LLVMContextImpl *pImpl = T->getContext().pImpl;
819 // If this is an all-undef or all-zero vector, return a
820 // ConstantAggregateZero or UndefValue.
822 bool isZero = C->isNullValue();
823 bool isUndef = isa<UndefValue>(C);
825 if (isZero || isUndef) {
826 for (unsigned i = 1, e = V.size(); i != e; ++i)
828 isZero = isUndef = false;
834 return ConstantAggregateZero::get(T);
836 return UndefValue::get(T);
838 return pImpl->VectorConstants.getOrCreate(T, V);
841 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
842 SmallVector<Constant*, 32> Elts(NumElts, V);
847 // Utility function for determining if a ConstantExpr is a CastOp or not. This
848 // can't be inline because we don't want to #include Instruction.h into
850 bool ConstantExpr::isCast() const {
851 return Instruction::isCast(getOpcode());
854 bool ConstantExpr::isCompare() const {
855 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
858 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
859 if (getOpcode() != Instruction::GetElementPtr) return false;
861 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
862 User::const_op_iterator OI = llvm::next(this->op_begin());
864 // Skip the first index, as it has no static limit.
868 // The remaining indices must be compile-time known integers within the
869 // bounds of the corresponding notional static array types.
870 for (; GEPI != E; ++GEPI, ++OI) {
871 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
872 if (!CI) return false;
873 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
874 if (CI->getValue().getActiveBits() > 64 ||
875 CI->getZExtValue() >= ATy->getNumElements())
879 // All the indices checked out.
883 bool ConstantExpr::hasIndices() const {
884 return getOpcode() == Instruction::ExtractValue ||
885 getOpcode() == Instruction::InsertValue;
888 ArrayRef<unsigned> ConstantExpr::getIndices() const {
889 if (const ExtractValueConstantExpr *EVCE =
890 dyn_cast<ExtractValueConstantExpr>(this))
891 return EVCE->Indices;
893 return cast<InsertValueConstantExpr>(this)->Indices;
896 unsigned ConstantExpr::getPredicate() const {
898 return ((const CompareConstantExpr*)this)->predicate;
901 /// getWithOperandReplaced - Return a constant expression identical to this
902 /// one, but with the specified operand set to the specified value.
904 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
905 assert(OpNo < getNumOperands() && "Operand num is out of range!");
906 assert(Op->getType() == getOperand(OpNo)->getType() &&
907 "Replacing operand with value of different type!");
908 if (getOperand(OpNo) == Op)
909 return const_cast<ConstantExpr*>(this);
911 Constant *Op0, *Op1, *Op2;
912 switch (getOpcode()) {
913 case Instruction::Trunc:
914 case Instruction::ZExt:
915 case Instruction::SExt:
916 case Instruction::FPTrunc:
917 case Instruction::FPExt:
918 case Instruction::UIToFP:
919 case Instruction::SIToFP:
920 case Instruction::FPToUI:
921 case Instruction::FPToSI:
922 case Instruction::PtrToInt:
923 case Instruction::IntToPtr:
924 case Instruction::BitCast:
925 return ConstantExpr::getCast(getOpcode(), Op, getType());
926 case Instruction::Select:
927 Op0 = (OpNo == 0) ? Op : getOperand(0);
928 Op1 = (OpNo == 1) ? Op : getOperand(1);
929 Op2 = (OpNo == 2) ? Op : getOperand(2);
930 return ConstantExpr::getSelect(Op0, Op1, Op2);
931 case Instruction::InsertElement:
932 Op0 = (OpNo == 0) ? Op : getOperand(0);
933 Op1 = (OpNo == 1) ? Op : getOperand(1);
934 Op2 = (OpNo == 2) ? Op : getOperand(2);
935 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
936 case Instruction::ExtractElement:
937 Op0 = (OpNo == 0) ? Op : getOperand(0);
938 Op1 = (OpNo == 1) ? Op : getOperand(1);
939 return ConstantExpr::getExtractElement(Op0, Op1);
940 case Instruction::ShuffleVector:
941 Op0 = (OpNo == 0) ? Op : getOperand(0);
942 Op1 = (OpNo == 1) ? Op : getOperand(1);
943 Op2 = (OpNo == 2) ? Op : getOperand(2);
944 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
945 case Instruction::GetElementPtr: {
946 SmallVector<Constant*, 8> Ops;
947 Ops.resize(getNumOperands()-1);
948 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
949 Ops[i-1] = getOperand(i);
952 ConstantExpr::getGetElementPtr(Op, Ops,
953 cast<GEPOperator>(this)->isInBounds());
956 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
957 cast<GEPOperator>(this)->isInBounds());
960 assert(getNumOperands() == 2 && "Must be binary operator?");
961 Op0 = (OpNo == 0) ? Op : getOperand(0);
962 Op1 = (OpNo == 1) ? Op : getOperand(1);
963 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
967 /// getWithOperands - This returns the current constant expression with the
968 /// operands replaced with the specified values. The specified array must
969 /// have the same number of operands as our current one.
970 Constant *ConstantExpr::
971 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
972 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
973 bool AnyChange = Ty != getType();
974 for (unsigned i = 0; i != Ops.size(); ++i)
975 AnyChange |= Ops[i] != getOperand(i);
977 if (!AnyChange) // No operands changed, return self.
978 return const_cast<ConstantExpr*>(this);
980 switch (getOpcode()) {
981 case Instruction::Trunc:
982 case Instruction::ZExt:
983 case Instruction::SExt:
984 case Instruction::FPTrunc:
985 case Instruction::FPExt:
986 case Instruction::UIToFP:
987 case Instruction::SIToFP:
988 case Instruction::FPToUI:
989 case Instruction::FPToSI:
990 case Instruction::PtrToInt:
991 case Instruction::IntToPtr:
992 case Instruction::BitCast:
993 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
994 case Instruction::Select:
995 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
996 case Instruction::InsertElement:
997 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
998 case Instruction::ExtractElement:
999 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1000 case Instruction::ShuffleVector:
1001 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1002 case Instruction::GetElementPtr:
1004 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1005 cast<GEPOperator>(this)->isInBounds());
1006 case Instruction::ICmp:
1007 case Instruction::FCmp:
1008 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1010 assert(getNumOperands() == 2 && "Must be binary operator?");
1011 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1016 //===----------------------------------------------------------------------===//
1017 // isValueValidForType implementations
1019 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1020 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1021 if (Ty->isIntegerTy(1))
1022 return Val == 0 || Val == 1;
1024 return true; // always true, has to fit in largest type
1025 uint64_t Max = (1ll << NumBits) - 1;
1029 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1030 unsigned NumBits = Ty->getIntegerBitWidth();
1031 if (Ty->isIntegerTy(1))
1032 return Val == 0 || Val == 1 || Val == -1;
1034 return true; // always true, has to fit in largest type
1035 int64_t Min = -(1ll << (NumBits-1));
1036 int64_t Max = (1ll << (NumBits-1)) - 1;
1037 return (Val >= Min && Val <= Max);
1040 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1041 // convert modifies in place, so make a copy.
1042 APFloat Val2 = APFloat(Val);
1044 switch (Ty->getTypeID()) {
1046 return false; // These can't be represented as floating point!
1048 // FIXME rounding mode needs to be more flexible
1049 case Type::HalfTyID: {
1050 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1052 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1055 case Type::FloatTyID: {
1056 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1058 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1061 case Type::DoubleTyID: {
1062 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1063 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1064 &Val2.getSemantics() == &APFloat::IEEEdouble)
1066 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1069 case Type::X86_FP80TyID:
1070 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1071 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1072 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1073 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1074 case Type::FP128TyID:
1075 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1076 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1077 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1078 &Val2.getSemantics() == &APFloat::IEEEquad;
1079 case Type::PPC_FP128TyID:
1080 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1081 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1082 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1083 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1088 //===----------------------------------------------------------------------===//
1089 // Factory Function Implementation
1091 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1092 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1093 "Cannot create an aggregate zero of non-aggregate type!");
1095 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1097 Entry = new ConstantAggregateZero(Ty);
1102 /// destroyConstant - Remove the constant from the constant table.
1104 void ConstantAggregateZero::destroyConstant() {
1105 getContext().pImpl->CAZConstants.erase(getType());
1106 destroyConstantImpl();
1109 /// destroyConstant - Remove the constant from the constant table...
1111 void ConstantArray::destroyConstant() {
1112 getType()->getContext().pImpl->ArrayConstants.remove(this);
1113 destroyConstantImpl();
1116 /// isString - This method returns true if the array is an array of i8, and
1117 /// if the elements of the array are all ConstantInt's.
1118 bool ConstantArray::isString() const {
1119 // Check the element type for i8...
1120 if (!getType()->getElementType()->isIntegerTy(8))
1122 // Check the elements to make sure they are all integers, not constant
1124 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1125 if (!isa<ConstantInt>(getOperand(i)))
1130 /// isCString - This method returns true if the array is a string (see
1131 /// isString) and it ends in a null byte \\0 and does not contains any other
1132 /// null bytes except its terminator.
1133 bool ConstantArray::isCString() const {
1134 // Check the element type for i8...
1135 if (!getType()->getElementType()->isIntegerTy(8))
1138 // Last element must be a null.
1139 if (!getOperand(getNumOperands()-1)->isNullValue())
1141 // Other elements must be non-null integers.
1142 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1143 if (!isa<ConstantInt>(getOperand(i)))
1145 if (getOperand(i)->isNullValue())
1152 /// convertToString - Helper function for getAsString() and getAsCString().
1153 static std::string convertToString(const User *U, unsigned len) {
1155 Result.reserve(len);
1156 for (unsigned i = 0; i != len; ++i)
1157 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1161 /// getAsString - If this array is isString(), then this method converts the
1162 /// array to an std::string and returns it. Otherwise, it asserts out.
1164 std::string ConstantArray::getAsString() const {
1165 assert(isString() && "Not a string!");
1166 return convertToString(this, getNumOperands());
1170 /// getAsCString - If this array is isCString(), then this method converts the
1171 /// array (without the trailing null byte) to an std::string and returns it.
1172 /// Otherwise, it asserts out.
1174 std::string ConstantArray::getAsCString() const {
1175 assert(isCString() && "Not a string!");
1176 return convertToString(this, getNumOperands() - 1);
1180 //---- ConstantStruct::get() implementation...
1183 // destroyConstant - Remove the constant from the constant table...
1185 void ConstantStruct::destroyConstant() {
1186 getType()->getContext().pImpl->StructConstants.remove(this);
1187 destroyConstantImpl();
1190 // destroyConstant - Remove the constant from the constant table...
1192 void ConstantVector::destroyConstant() {
1193 getType()->getContext().pImpl->VectorConstants.remove(this);
1194 destroyConstantImpl();
1197 /// getSplatValue - If this is a splat constant, where all of the
1198 /// elements have the same value, return that value. Otherwise return null.
1199 Constant *ConstantVector::getSplatValue() const {
1200 // Check out first element.
1201 Constant *Elt = getOperand(0);
1202 // Then make sure all remaining elements point to the same value.
1203 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1204 if (getOperand(I) != Elt)
1209 //---- ConstantPointerNull::get() implementation.
1212 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1213 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1215 Entry = new ConstantPointerNull(Ty);
1220 // destroyConstant - Remove the constant from the constant table...
1222 void ConstantPointerNull::destroyConstant() {
1223 getContext().pImpl->CPNConstants.erase(getType());
1224 // Free the constant and any dangling references to it.
1225 destroyConstantImpl();
1229 //---- UndefValue::get() implementation.
1232 UndefValue *UndefValue::get(Type *Ty) {
1233 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1235 Entry = new UndefValue(Ty);
1240 // destroyConstant - Remove the constant from the constant table.
1242 void UndefValue::destroyConstant() {
1243 // Free the constant and any dangling references to it.
1244 getContext().pImpl->UVConstants.erase(getType());
1245 destroyConstantImpl();
1248 //---- BlockAddress::get() implementation.
1251 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1252 assert(BB->getParent() != 0 && "Block must have a parent");
1253 return get(BB->getParent(), BB);
1256 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1258 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1260 BA = new BlockAddress(F, BB);
1262 assert(BA->getFunction() == F && "Basic block moved between functions");
1266 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1267 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1271 BB->AdjustBlockAddressRefCount(1);
1275 // destroyConstant - Remove the constant from the constant table.
1277 void BlockAddress::destroyConstant() {
1278 getFunction()->getType()->getContext().pImpl
1279 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1280 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1281 destroyConstantImpl();
1284 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1285 // This could be replacing either the Basic Block or the Function. In either
1286 // case, we have to remove the map entry.
1287 Function *NewF = getFunction();
1288 BasicBlock *NewBB = getBasicBlock();
1291 NewF = cast<Function>(To);
1293 NewBB = cast<BasicBlock>(To);
1295 // See if the 'new' entry already exists, if not, just update this in place
1296 // and return early.
1297 BlockAddress *&NewBA =
1298 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1300 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1302 // Remove the old entry, this can't cause the map to rehash (just a
1303 // tombstone will get added).
1304 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1307 setOperand(0, NewF);
1308 setOperand(1, NewBB);
1309 getBasicBlock()->AdjustBlockAddressRefCount(1);
1313 // Otherwise, I do need to replace this with an existing value.
1314 assert(NewBA != this && "I didn't contain From!");
1316 // Everyone using this now uses the replacement.
1317 replaceAllUsesWith(NewBA);
1322 //---- ConstantExpr::get() implementations.
1325 /// This is a utility function to handle folding of casts and lookup of the
1326 /// cast in the ExprConstants map. It is used by the various get* methods below.
1327 static inline Constant *getFoldedCast(
1328 Instruction::CastOps opc, Constant *C, Type *Ty) {
1329 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1330 // Fold a few common cases
1331 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1334 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1336 // Look up the constant in the table first to ensure uniqueness
1337 std::vector<Constant*> argVec(1, C);
1338 ExprMapKeyType Key(opc, argVec);
1340 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1343 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1344 Instruction::CastOps opc = Instruction::CastOps(oc);
1345 assert(Instruction::isCast(opc) && "opcode out of range");
1346 assert(C && Ty && "Null arguments to getCast");
1347 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1351 llvm_unreachable("Invalid cast opcode");
1352 case Instruction::Trunc: return getTrunc(C, Ty);
1353 case Instruction::ZExt: return getZExt(C, Ty);
1354 case Instruction::SExt: return getSExt(C, Ty);
1355 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1356 case Instruction::FPExt: return getFPExtend(C, Ty);
1357 case Instruction::UIToFP: return getUIToFP(C, Ty);
1358 case Instruction::SIToFP: return getSIToFP(C, Ty);
1359 case Instruction::FPToUI: return getFPToUI(C, Ty);
1360 case Instruction::FPToSI: return getFPToSI(C, Ty);
1361 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1362 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1363 case Instruction::BitCast: return getBitCast(C, Ty);
1367 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1368 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1369 return getBitCast(C, Ty);
1370 return getZExt(C, Ty);
1373 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1374 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1375 return getBitCast(C, Ty);
1376 return getSExt(C, Ty);
1379 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1380 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1381 return getBitCast(C, Ty);
1382 return getTrunc(C, Ty);
1385 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1386 assert(S->getType()->isPointerTy() && "Invalid cast");
1387 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1389 if (Ty->isIntegerTy())
1390 return getPtrToInt(S, Ty);
1391 return getBitCast(S, Ty);
1394 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1396 assert(C->getType()->isIntOrIntVectorTy() &&
1397 Ty->isIntOrIntVectorTy() && "Invalid cast");
1398 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1399 unsigned DstBits = Ty->getScalarSizeInBits();
1400 Instruction::CastOps opcode =
1401 (SrcBits == DstBits ? Instruction::BitCast :
1402 (SrcBits > DstBits ? Instruction::Trunc :
1403 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1404 return getCast(opcode, C, Ty);
1407 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1408 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1410 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1411 unsigned DstBits = Ty->getScalarSizeInBits();
1412 if (SrcBits == DstBits)
1413 return C; // Avoid a useless cast
1414 Instruction::CastOps opcode =
1415 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1416 return getCast(opcode, C, Ty);
1419 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1421 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1422 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1424 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1425 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1426 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1427 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1428 "SrcTy must be larger than DestTy for Trunc!");
1430 return getFoldedCast(Instruction::Trunc, C, Ty);
1433 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1435 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1436 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1438 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1439 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1440 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1441 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1442 "SrcTy must be smaller than DestTy for SExt!");
1444 return getFoldedCast(Instruction::SExt, C, Ty);
1447 Constant *ConstantExpr::getZExt(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()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1454 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1455 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1456 "SrcTy must be smaller than DestTy for ZExt!");
1458 return getFoldedCast(Instruction::ZExt, C, Ty);
1461 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1463 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1464 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1466 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1467 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1468 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1469 "This is an illegal floating point truncation!");
1470 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1473 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1475 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1476 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1478 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1479 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1480 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1481 "This is an illegal floating point extension!");
1482 return getFoldedCast(Instruction::FPExt, C, Ty);
1485 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1487 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1488 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1490 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1491 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1492 "This is an illegal uint to floating point cast!");
1493 return getFoldedCast(Instruction::UIToFP, C, Ty);
1496 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1498 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1499 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1501 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1502 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1503 "This is an illegal sint to floating point cast!");
1504 return getFoldedCast(Instruction::SIToFP, C, Ty);
1507 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1509 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1510 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1512 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1513 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1514 "This is an illegal floating point to uint cast!");
1515 return getFoldedCast(Instruction::FPToUI, C, Ty);
1518 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1520 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1521 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1523 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1524 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1525 "This is an illegal floating point to sint cast!");
1526 return getFoldedCast(Instruction::FPToSI, C, Ty);
1529 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1530 assert(C->getType()->getScalarType()->isPointerTy() &&
1531 "PtrToInt source must be pointer or pointer vector");
1532 assert(DstTy->getScalarType()->isIntegerTy() &&
1533 "PtrToInt destination must be integer or integer vector");
1534 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1535 if (isa<VectorType>(C->getType()))
1536 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1537 "Invalid cast between a different number of vector elements");
1538 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1541 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1542 assert(C->getType()->getScalarType()->isIntegerTy() &&
1543 "IntToPtr source must be integer or integer vector");
1544 assert(DstTy->getScalarType()->isPointerTy() &&
1545 "IntToPtr destination must be a pointer or pointer vector");
1546 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1547 if (isa<VectorType>(C->getType()))
1548 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1549 "Invalid cast between a different number of vector elements");
1550 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1553 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1554 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1555 "Invalid constantexpr bitcast!");
1557 // It is common to ask for a bitcast of a value to its own type, handle this
1559 if (C->getType() == DstTy) return C;
1561 return getFoldedCast(Instruction::BitCast, C, DstTy);
1564 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1566 // Check the operands for consistency first.
1567 assert(Opcode >= Instruction::BinaryOpsBegin &&
1568 Opcode < Instruction::BinaryOpsEnd &&
1569 "Invalid opcode in binary constant expression");
1570 assert(C1->getType() == C2->getType() &&
1571 "Operand types in binary constant expression should match");
1575 case Instruction::Add:
1576 case Instruction::Sub:
1577 case Instruction::Mul:
1578 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1579 assert(C1->getType()->isIntOrIntVectorTy() &&
1580 "Tried to create an integer operation on a non-integer type!");
1582 case Instruction::FAdd:
1583 case Instruction::FSub:
1584 case Instruction::FMul:
1585 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1586 assert(C1->getType()->isFPOrFPVectorTy() &&
1587 "Tried to create a floating-point operation on a "
1588 "non-floating-point type!");
1590 case Instruction::UDiv:
1591 case Instruction::SDiv:
1592 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1593 assert(C1->getType()->isIntOrIntVectorTy() &&
1594 "Tried to create an arithmetic operation on a non-arithmetic type!");
1596 case Instruction::FDiv:
1597 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1598 assert(C1->getType()->isFPOrFPVectorTy() &&
1599 "Tried to create an arithmetic operation on a non-arithmetic type!");
1601 case Instruction::URem:
1602 case Instruction::SRem:
1603 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1604 assert(C1->getType()->isIntOrIntVectorTy() &&
1605 "Tried to create an arithmetic operation on a non-arithmetic type!");
1607 case Instruction::FRem:
1608 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1609 assert(C1->getType()->isFPOrFPVectorTy() &&
1610 "Tried to create an arithmetic operation on a non-arithmetic type!");
1612 case Instruction::And:
1613 case Instruction::Or:
1614 case Instruction::Xor:
1615 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1616 assert(C1->getType()->isIntOrIntVectorTy() &&
1617 "Tried to create a logical operation on a non-integral type!");
1619 case Instruction::Shl:
1620 case Instruction::LShr:
1621 case Instruction::AShr:
1622 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1623 assert(C1->getType()->isIntOrIntVectorTy() &&
1624 "Tried to create a shift operation on a non-integer type!");
1631 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1632 return FC; // Fold a few common cases.
1634 std::vector<Constant*> argVec(1, C1);
1635 argVec.push_back(C2);
1636 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1638 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1639 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1642 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1643 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1644 // Note that a non-inbounds gep is used, as null isn't within any object.
1645 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1646 Constant *GEP = getGetElementPtr(
1647 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1648 return getPtrToInt(GEP,
1649 Type::getInt64Ty(Ty->getContext()));
1652 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1653 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1654 // Note that a non-inbounds gep is used, as null isn't within any object.
1656 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1657 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1658 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1659 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1660 Constant *Indices[2] = { Zero, One };
1661 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1662 return getPtrToInt(GEP,
1663 Type::getInt64Ty(Ty->getContext()));
1666 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1667 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1671 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1672 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1673 // Note that a non-inbounds gep is used, as null isn't within any object.
1674 Constant *GEPIdx[] = {
1675 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1678 Constant *GEP = getGetElementPtr(
1679 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1680 return getPtrToInt(GEP,
1681 Type::getInt64Ty(Ty->getContext()));
1684 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1685 Constant *C1, Constant *C2) {
1686 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1688 switch (Predicate) {
1689 default: llvm_unreachable("Invalid CmpInst predicate");
1690 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1691 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1692 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1693 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1694 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1695 case CmpInst::FCMP_TRUE:
1696 return getFCmp(Predicate, C1, C2);
1698 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1699 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1700 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1701 case CmpInst::ICMP_SLE:
1702 return getICmp(Predicate, C1, C2);
1706 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1707 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1709 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1710 return SC; // Fold common cases
1712 std::vector<Constant*> argVec(3, C);
1715 ExprMapKeyType Key(Instruction::Select, argVec);
1717 LLVMContextImpl *pImpl = C->getContext().pImpl;
1718 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1721 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1723 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1724 return FC; // Fold a few common cases.
1726 // Get the result type of the getelementptr!
1727 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1728 assert(Ty && "GEP indices invalid!");
1729 unsigned AS = C->getType()->getPointerAddressSpace();
1730 Type *ReqTy = Ty->getPointerTo(AS);
1732 assert(C->getType()->isPointerTy() &&
1733 "Non-pointer type for constant GetElementPtr expression");
1734 // Look up the constant in the table first to ensure uniqueness
1735 std::vector<Constant*> ArgVec;
1736 ArgVec.reserve(1 + Idxs.size());
1737 ArgVec.push_back(C);
1738 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1739 ArgVec.push_back(cast<Constant>(Idxs[i]));
1740 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1741 InBounds ? GEPOperator::IsInBounds : 0);
1743 LLVMContextImpl *pImpl = C->getContext().pImpl;
1744 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1748 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1749 assert(LHS->getType() == RHS->getType());
1750 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1751 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1753 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
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;
1758 ArgVec.push_back(LHS);
1759 ArgVec.push_back(RHS);
1760 // Get the key type with both the opcode and predicate
1761 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1763 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1764 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1765 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1767 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1768 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1772 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1773 assert(LHS->getType() == RHS->getType());
1774 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1776 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1777 return FC; // Fold a few common cases...
1779 // Look up the constant in the table first to ensure uniqueness
1780 std::vector<Constant*> ArgVec;
1781 ArgVec.push_back(LHS);
1782 ArgVec.push_back(RHS);
1783 // Get the key type with both the opcode and predicate
1784 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1786 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1787 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1788 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1790 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1791 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1794 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1795 assert(Val->getType()->isVectorTy() &&
1796 "Tried to create extractelement operation on non-vector type!");
1797 assert(Idx->getType()->isIntegerTy(32) &&
1798 "Extractelement index must be i32 type!");
1800 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1801 return FC; // Fold a few common cases.
1803 // Look up the constant in the table first to ensure uniqueness
1804 std::vector<Constant*> ArgVec(1, Val);
1805 ArgVec.push_back(Idx);
1806 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1808 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1809 Type *ReqTy = Val->getType()->getVectorElementType();
1810 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1813 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1815 assert(Val->getType()->isVectorTy() &&
1816 "Tried to create insertelement operation on non-vector type!");
1817 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1818 "Insertelement types must match!");
1819 assert(Idx->getType()->isIntegerTy(32) &&
1820 "Insertelement index must be i32 type!");
1822 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1823 return FC; // Fold a few common cases.
1824 // Look up the constant in the table first to ensure uniqueness
1825 std::vector<Constant*> ArgVec(1, Val);
1826 ArgVec.push_back(Elt);
1827 ArgVec.push_back(Idx);
1828 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1830 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1831 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1834 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1836 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1837 "Invalid shuffle vector constant expr operands!");
1839 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1840 return FC; // Fold a few common cases.
1842 unsigned NElts = Mask->getType()->getVectorNumElements();
1843 Type *EltTy = V1->getType()->getVectorElementType();
1844 Type *ShufTy = VectorType::get(EltTy, NElts);
1846 // Look up the constant in the table first to ensure uniqueness
1847 std::vector<Constant*> ArgVec(1, V1);
1848 ArgVec.push_back(V2);
1849 ArgVec.push_back(Mask);
1850 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1852 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1853 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1856 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1857 ArrayRef<unsigned> Idxs) {
1858 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1859 Idxs) == Val->getType() &&
1860 "insertvalue indices invalid!");
1861 assert(Agg->getType()->isFirstClassType() &&
1862 "Non-first-class type for constant insertvalue expression");
1863 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1864 assert(FC && "insertvalue constant expr couldn't be folded!");
1868 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1869 ArrayRef<unsigned> Idxs) {
1870 assert(Agg->getType()->isFirstClassType() &&
1871 "Tried to create extractelement operation on non-first-class type!");
1873 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1875 assert(ReqTy && "extractvalue indices invalid!");
1877 assert(Agg->getType()->isFirstClassType() &&
1878 "Non-first-class type for constant extractvalue expression");
1879 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1880 assert(FC && "ExtractValue constant expr couldn't be folded!");
1884 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1885 assert(C->getType()->isIntOrIntVectorTy() &&
1886 "Cannot NEG a nonintegral value!");
1887 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1891 Constant *ConstantExpr::getFNeg(Constant *C) {
1892 assert(C->getType()->isFPOrFPVectorTy() &&
1893 "Cannot FNEG a non-floating-point value!");
1894 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1897 Constant *ConstantExpr::getNot(Constant *C) {
1898 assert(C->getType()->isIntOrIntVectorTy() &&
1899 "Cannot NOT a nonintegral value!");
1900 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1903 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1904 bool HasNUW, bool HasNSW) {
1905 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1906 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1907 return get(Instruction::Add, C1, C2, Flags);
1910 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1911 return get(Instruction::FAdd, C1, C2);
1914 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1915 bool HasNUW, bool HasNSW) {
1916 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1917 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1918 return get(Instruction::Sub, C1, C2, Flags);
1921 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1922 return get(Instruction::FSub, C1, C2);
1925 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1926 bool HasNUW, bool HasNSW) {
1927 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1928 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1929 return get(Instruction::Mul, C1, C2, Flags);
1932 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1933 return get(Instruction::FMul, C1, C2);
1936 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1937 return get(Instruction::UDiv, C1, C2,
1938 isExact ? PossiblyExactOperator::IsExact : 0);
1941 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1942 return get(Instruction::SDiv, C1, C2,
1943 isExact ? PossiblyExactOperator::IsExact : 0);
1946 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1947 return get(Instruction::FDiv, C1, C2);
1950 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1951 return get(Instruction::URem, C1, C2);
1954 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1955 return get(Instruction::SRem, C1, C2);
1958 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1959 return get(Instruction::FRem, C1, C2);
1962 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1963 return get(Instruction::And, C1, C2);
1966 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1967 return get(Instruction::Or, C1, C2);
1970 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1971 return get(Instruction::Xor, C1, C2);
1974 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1975 bool HasNUW, bool HasNSW) {
1976 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1977 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1978 return get(Instruction::Shl, C1, C2, Flags);
1981 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1982 return get(Instruction::LShr, C1, C2,
1983 isExact ? PossiblyExactOperator::IsExact : 0);
1986 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1987 return get(Instruction::AShr, C1, C2,
1988 isExact ? PossiblyExactOperator::IsExact : 0);
1991 // destroyConstant - Remove the constant from the constant table...
1993 void ConstantExpr::destroyConstant() {
1994 getType()->getContext().pImpl->ExprConstants.remove(this);
1995 destroyConstantImpl();
1998 const char *ConstantExpr::getOpcodeName() const {
1999 return Instruction::getOpcodeName(getOpcode());
2004 GetElementPtrConstantExpr::
2005 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
2007 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2008 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2009 - (IdxList.size()+1), IdxList.size()+1) {
2011 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2012 OperandList[i+1] = IdxList[i];
2015 //===----------------------------------------------------------------------===//
2016 // ConstantData* implementations
2018 void ConstantDataArray::anchor() {}
2019 void ConstantDataVector::anchor() {}
2021 /// getElementType - Return the element type of the array/vector.
2022 Type *ConstantDataSequential::getElementType() const {
2023 return getType()->getElementType();
2026 StringRef ConstantDataSequential::getRawDataValues() const {
2027 return StringRef(DataElements, getNumElements()*getElementByteSize());
2030 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2031 /// formed with a vector or array of the specified element type.
2032 /// ConstantDataArray only works with normal float and int types that are
2033 /// stored densely in memory, not with things like i42 or x86_f80.
2034 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2035 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2036 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2037 switch (IT->getBitWidth()) {
2049 /// getNumElements - Return the number of elements in the array or vector.
2050 unsigned ConstantDataSequential::getNumElements() const {
2051 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2052 return AT->getNumElements();
2053 return getType()->getVectorNumElements();
2057 /// getElementByteSize - Return the size in bytes of the elements in the data.
2058 uint64_t ConstantDataSequential::getElementByteSize() const {
2059 return getElementType()->getPrimitiveSizeInBits()/8;
2062 /// getElementPointer - Return the start of the specified element.
2063 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2064 assert(Elt < getNumElements() && "Invalid Elt");
2065 return DataElements+Elt*getElementByteSize();
2069 /// isAllZeros - return true if the array is empty or all zeros.
2070 static bool isAllZeros(StringRef Arr) {
2071 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2077 /// getImpl - This is the underlying implementation of all of the
2078 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2079 /// the correct element type. We take the bytes in as an StringRef because
2080 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2081 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2082 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2083 // If the elements are all zero or there are no elements, return a CAZ, which
2084 // is more dense and canonical.
2085 if (isAllZeros(Elements))
2086 return ConstantAggregateZero::get(Ty);
2088 // Do a lookup to see if we have already formed one of these.
2089 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2090 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2092 // The bucket can point to a linked list of different CDS's that have the same
2093 // body but different types. For example, 0,0,0,1 could be a 4 element array
2094 // of i8, or a 1-element array of i32. They'll both end up in the same
2095 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2096 ConstantDataSequential **Entry = &Slot.getValue();
2097 for (ConstantDataSequential *Node = *Entry; Node != 0;
2098 Entry = &Node->Next, Node = *Entry)
2099 if (Node->getType() == Ty)
2102 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2104 if (isa<ArrayType>(Ty))
2105 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2107 assert(isa<VectorType>(Ty));
2108 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2111 void ConstantDataSequential::destroyConstant() {
2112 // Remove the constant from the StringMap.
2113 StringMap<ConstantDataSequential*> &CDSConstants =
2114 getType()->getContext().pImpl->CDSConstants;
2116 StringMap<ConstantDataSequential*>::iterator Slot =
2117 CDSConstants.find(getRawDataValues());
2119 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2121 ConstantDataSequential **Entry = &Slot->getValue();
2123 // Remove the entry from the hash table.
2124 if ((*Entry)->Next == 0) {
2125 // If there is only one value in the bucket (common case) it must be this
2126 // entry, and removing the entry should remove the bucket completely.
2127 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2128 getContext().pImpl->CDSConstants.erase(Slot);
2130 // Otherwise, there are multiple entries linked off the bucket, unlink the
2131 // node we care about but keep the bucket around.
2132 for (ConstantDataSequential *Node = *Entry; ;
2133 Entry = &Node->Next, Node = *Entry) {
2134 assert(Node && "Didn't find entry in its uniquing hash table!");
2135 // If we found our entry, unlink it from the list and we're done.
2137 *Entry = Node->Next;
2143 // If we were part of a list, make sure that we don't delete the list that is
2144 // still owned by the uniquing map.
2147 // Finally, actually delete it.
2148 destroyConstantImpl();
2151 /// get() constructors - Return a constant with array type with an element
2152 /// count and element type matching the ArrayRef passed in. Note that this
2153 /// can return a ConstantAggregateZero object.
2154 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2155 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2156 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2158 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2159 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2160 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2162 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2163 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2164 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2166 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2167 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2168 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2170 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2171 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2172 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2174 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2175 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2176 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2179 /// getString - This method constructs a CDS and initializes it with a text
2180 /// string. The default behavior (AddNull==true) causes a null terminator to
2181 /// be placed at the end of the array (increasing the length of the string by
2182 /// one more than the StringRef would normally indicate. Pass AddNull=false
2183 /// to disable this behavior.
2184 Constant *ConstantDataArray::getString(LLVMContext &Context,
2185 StringRef Str, bool AddNull) {
2187 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2189 SmallVector<uint8_t, 64> ElementVals;
2190 ElementVals.append(Str.begin(), Str.end());
2191 ElementVals.push_back(0);
2192 return get(Context, ElementVals);
2195 /// get() constructors - Return a constant with vector type with an element
2196 /// count and element type matching the ArrayRef passed in. Note that this
2197 /// can return a ConstantAggregateZero object.
2198 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2199 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2200 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2202 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2203 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2204 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2206 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2207 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2208 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2210 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2211 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2212 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2214 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2215 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2216 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2218 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2219 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2220 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2223 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2224 assert(isElementTypeCompatible(V->getType()) &&
2225 "Element type not compatible with ConstantData");
2226 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2227 if (CI->getType()->isIntegerTy(8)) {
2228 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2229 return get(V->getContext(), Elts);
2231 if (CI->getType()->isIntegerTy(16)) {
2232 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2233 return get(V->getContext(), Elts);
2235 if (CI->getType()->isIntegerTy(32)) {
2236 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2237 return get(V->getContext(), Elts);
2239 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2240 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2241 return get(V->getContext(), Elts);
2244 ConstantFP *CFP = cast<ConstantFP>(V);
2245 if (CFP->getType()->isFloatTy()) {
2246 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2247 return get(V->getContext(), Elts);
2249 assert(CFP->getType()->isDoubleTy() && "Unsupported ConstantData type");
2250 SmallVector<double, 16> Elts(NumElts, CFP->getValueAPF().convertToDouble());
2251 return get(V->getContext(), Elts);
2255 /// getElementAsInteger - If this is a sequential container of integers (of
2256 /// any size), return the specified element in the low bits of a uint64_t.
2257 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2258 assert(isa<IntegerType>(getElementType()) &&
2259 "Accessor can only be used when element is an integer");
2260 const char *EltPtr = getElementPointer(Elt);
2262 // The data is stored in host byte order, make sure to cast back to the right
2263 // type to load with the right endianness.
2264 switch (getElementType()->getIntegerBitWidth()) {
2265 default: assert(0 && "Invalid bitwidth for CDS");
2266 case 8: return *(uint8_t*)EltPtr;
2267 case 16: return *(uint16_t*)EltPtr;
2268 case 32: return *(uint32_t*)EltPtr;
2269 case 64: return *(uint64_t*)EltPtr;
2273 /// getElementAsAPFloat - If this is a sequential container of floating point
2274 /// type, return the specified element as an APFloat.
2275 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2276 const char *EltPtr = getElementPointer(Elt);
2278 switch (getElementType()->getTypeID()) {
2280 assert(0 && "Accessor can only be used when element is float/double!");
2281 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2282 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2286 /// getElementAsFloat - If this is an sequential container of floats, return
2287 /// the specified element as a float.
2288 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2289 assert(getElementType()->isFloatTy() &&
2290 "Accessor can only be used when element is a 'float'");
2291 return *(float*)getElementPointer(Elt);
2294 /// getElementAsDouble - If this is an sequential container of doubles, return
2295 /// the specified element as a float.
2296 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2297 assert(getElementType()->isDoubleTy() &&
2298 "Accessor can only be used when element is a 'float'");
2299 return *(double*)getElementPointer(Elt);
2302 /// getElementAsConstant - Return a Constant for a specified index's element.
2303 /// Note that this has to compute a new constant to return, so it isn't as
2304 /// efficient as getElementAsInteger/Float/Double.
2305 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2306 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2307 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2309 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2312 /// isString - This method returns true if this is an array of i8.
2313 bool ConstantDataSequential::isString() const {
2314 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2317 /// isCString - This method returns true if the array "isString", ends with a
2318 /// nul byte, and does not contains any other nul bytes.
2319 bool ConstantDataSequential::isCString() const {
2323 StringRef Str = getAsString();
2325 // The last value must be nul.
2326 if (Str.back() != 0) return false;
2328 // Other elements must be non-nul.
2329 return Str.drop_back().find(0) == StringRef::npos;
2333 //===----------------------------------------------------------------------===//
2334 // replaceUsesOfWithOnConstant implementations
2336 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2337 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2340 /// Note that we intentionally replace all uses of From with To here. Consider
2341 /// a large array that uses 'From' 1000 times. By handling this case all here,
2342 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2343 /// single invocation handles all 1000 uses. Handling them one at a time would
2344 /// work, but would be really slow because it would have to unique each updated
2347 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2349 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2350 Constant *ToC = cast<Constant>(To);
2352 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2354 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2355 Lookup.first.first = cast<ArrayType>(getType());
2356 Lookup.second = this;
2358 std::vector<Constant*> &Values = Lookup.first.second;
2359 Values.reserve(getNumOperands()); // Build replacement array.
2361 // Fill values with the modified operands of the constant array. Also,
2362 // compute whether this turns into an all-zeros array.
2363 bool isAllZeros = false;
2364 unsigned NumUpdated = 0;
2365 if (!ToC->isNullValue()) {
2366 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2367 Constant *Val = cast<Constant>(O->get());
2372 Values.push_back(Val);
2376 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2377 Constant *Val = cast<Constant>(O->get());
2382 Values.push_back(Val);
2383 if (isAllZeros) isAllZeros = Val->isNullValue();
2387 Constant *Replacement = 0;
2389 Replacement = ConstantAggregateZero::get(getType());
2391 // Check to see if we have this array type already.
2393 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2394 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2397 Replacement = I->second;
2399 // Okay, the new shape doesn't exist in the system yet. Instead of
2400 // creating a new constant array, inserting it, replaceallusesof'ing the
2401 // old with the new, then deleting the old... just update the current one
2403 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2405 // Update to the new value. Optimize for the case when we have a single
2406 // operand that we're changing, but handle bulk updates efficiently.
2407 if (NumUpdated == 1) {
2408 unsigned OperandToUpdate = U - OperandList;
2409 assert(getOperand(OperandToUpdate) == From &&
2410 "ReplaceAllUsesWith broken!");
2411 setOperand(OperandToUpdate, ToC);
2413 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2414 if (getOperand(i) == From)
2421 // Otherwise, I do need to replace this with an existing value.
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 ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2433 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2434 Constant *ToC = cast<Constant>(To);
2436 unsigned OperandToUpdate = U-OperandList;
2437 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2439 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2440 Lookup.first.first = cast<StructType>(getType());
2441 Lookup.second = this;
2442 std::vector<Constant*> &Values = Lookup.first.second;
2443 Values.reserve(getNumOperands()); // Build replacement struct.
2446 // Fill values with the modified operands of the constant struct. Also,
2447 // compute whether this turns into an all-zeros struct.
2448 bool isAllZeros = false;
2449 if (!ToC->isNullValue()) {
2450 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2451 Values.push_back(cast<Constant>(O->get()));
2454 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2455 Constant *Val = cast<Constant>(O->get());
2456 Values.push_back(Val);
2457 if (isAllZeros) isAllZeros = Val->isNullValue();
2460 Values[OperandToUpdate] = ToC;
2462 LLVMContextImpl *pImpl = getContext().pImpl;
2464 Constant *Replacement = 0;
2466 Replacement = ConstantAggregateZero::get(getType());
2468 // Check to see if we have this struct type already.
2470 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2471 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2474 Replacement = I->second;
2476 // Okay, the new shape doesn't exist in the system yet. Instead of
2477 // creating a new constant struct, inserting it, replaceallusesof'ing the
2478 // old with the new, then deleting the old... just update the current one
2480 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2482 // Update to the new value.
2483 setOperand(OperandToUpdate, ToC);
2488 assert(Replacement != this && "I didn't contain From!");
2490 // Everyone using this now uses the replacement.
2491 replaceAllUsesWith(Replacement);
2493 // Delete the old constant!
2497 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2499 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2501 std::vector<Constant*> Values;
2502 Values.reserve(getNumOperands()); // Build replacement array...
2503 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2504 Constant *Val = getOperand(i);
2505 if (Val == From) Val = cast<Constant>(To);
2506 Values.push_back(Val);
2509 Constant *Replacement = get(Values);
2510 assert(Replacement != this && "I didn't contain From!");
2512 // Everyone using this now uses the replacement.
2513 replaceAllUsesWith(Replacement);
2515 // Delete the old constant!
2519 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2521 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2522 Constant *To = cast<Constant>(ToV);
2524 Constant *Replacement = 0;
2525 if (getOpcode() == Instruction::GetElementPtr) {
2526 SmallVector<Constant*, 8> Indices;
2527 Constant *Pointer = getOperand(0);
2528 Indices.reserve(getNumOperands()-1);
2529 if (Pointer == From) Pointer = To;
2531 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2532 Constant *Val = getOperand(i);
2533 if (Val == From) Val = To;
2534 Indices.push_back(Val);
2536 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2537 cast<GEPOperator>(this)->isInBounds());
2538 } else if (getOpcode() == Instruction::ExtractValue) {
2539 Constant *Agg = getOperand(0);
2540 if (Agg == From) Agg = To;
2542 ArrayRef<unsigned> Indices = getIndices();
2543 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2544 } else if (getOpcode() == Instruction::InsertValue) {
2545 Constant *Agg = getOperand(0);
2546 Constant *Val = getOperand(1);
2547 if (Agg == From) Agg = To;
2548 if (Val == From) Val = To;
2550 ArrayRef<unsigned> Indices = getIndices();
2551 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2552 } else if (isCast()) {
2553 assert(getOperand(0) == From && "Cast only has one use!");
2554 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2555 } else if (getOpcode() == Instruction::Select) {
2556 Constant *C1 = getOperand(0);
2557 Constant *C2 = getOperand(1);
2558 Constant *C3 = getOperand(2);
2559 if (C1 == From) C1 = To;
2560 if (C2 == From) C2 = To;
2561 if (C3 == From) C3 = To;
2562 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2563 } else if (getOpcode() == Instruction::ExtractElement) {
2564 Constant *C1 = getOperand(0);
2565 Constant *C2 = getOperand(1);
2566 if (C1 == From) C1 = To;
2567 if (C2 == From) C2 = To;
2568 Replacement = ConstantExpr::getExtractElement(C1, C2);
2569 } else if (getOpcode() == Instruction::InsertElement) {
2570 Constant *C1 = getOperand(0);
2571 Constant *C2 = getOperand(1);
2572 Constant *C3 = getOperand(1);
2573 if (C1 == From) C1 = To;
2574 if (C2 == From) C2 = To;
2575 if (C3 == From) C3 = To;
2576 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2577 } else if (getOpcode() == Instruction::ShuffleVector) {
2578 Constant *C1 = getOperand(0);
2579 Constant *C2 = getOperand(1);
2580 Constant *C3 = getOperand(2);
2581 if (C1 == From) C1 = To;
2582 if (C2 == From) C2 = To;
2583 if (C3 == From) C3 = To;
2584 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2585 } else if (isCompare()) {
2586 Constant *C1 = getOperand(0);
2587 Constant *C2 = getOperand(1);
2588 if (C1 == From) C1 = To;
2589 if (C2 == From) C2 = To;
2590 if (getOpcode() == Instruction::ICmp)
2591 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2593 assert(getOpcode() == Instruction::FCmp);
2594 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2596 } else if (getNumOperands() == 2) {
2597 Constant *C1 = getOperand(0);
2598 Constant *C2 = getOperand(1);
2599 if (C1 == From) C1 = To;
2600 if (C2 == From) C2 = To;
2601 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2603 llvm_unreachable("Unknown ConstantExpr type!");
2606 assert(Replacement != this && "I didn't contain From!");
2608 // Everyone using this now uses the replacement.
2609 replaceAllUsesWith(Replacement);
2611 // Delete the old constant!