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();
81 // Check for constant vectors which are splats of -1 values.
82 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
83 if (Constant *Splat = CV->getSplatValue())
84 return Splat->isAllOnesValue();
89 // Constructor to create a '0' constant of arbitrary type...
90 Constant *Constant::getNullValue(Type *Ty) {
91 switch (Ty->getTypeID()) {
92 case Type::IntegerTyID:
93 return ConstantInt::get(Ty, 0);
95 return ConstantFP::get(Ty->getContext(),
96 APFloat::getZero(APFloat::IEEEhalf));
98 return ConstantFP::get(Ty->getContext(),
99 APFloat::getZero(APFloat::IEEEsingle));
100 case Type::DoubleTyID:
101 return ConstantFP::get(Ty->getContext(),
102 APFloat::getZero(APFloat::IEEEdouble));
103 case Type::X86_FP80TyID:
104 return ConstantFP::get(Ty->getContext(),
105 APFloat::getZero(APFloat::x87DoubleExtended));
106 case Type::FP128TyID:
107 return ConstantFP::get(Ty->getContext(),
108 APFloat::getZero(APFloat::IEEEquad));
109 case Type::PPC_FP128TyID:
110 return ConstantFP::get(Ty->getContext(),
111 APFloat(APInt::getNullValue(128)));
112 case Type::PointerTyID:
113 return ConstantPointerNull::get(cast<PointerType>(Ty));
114 case Type::StructTyID:
115 case Type::ArrayTyID:
116 case Type::VectorTyID:
117 return ConstantAggregateZero::get(Ty);
119 // Function, Label, or Opaque type?
120 assert(0 && "Cannot create a null constant of that type!");
125 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
126 Type *ScalarTy = Ty->getScalarType();
128 // Create the base integer constant.
129 Constant *C = ConstantInt::get(Ty->getContext(), V);
131 // Convert an integer to a pointer, if necessary.
132 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
133 C = ConstantExpr::getIntToPtr(C, PTy);
135 // Broadcast a scalar to a vector, if necessary.
136 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
137 C = ConstantVector::getSplat(VTy->getNumElements(), C);
142 Constant *Constant::getAllOnesValue(Type *Ty) {
143 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
144 return ConstantInt::get(Ty->getContext(),
145 APInt::getAllOnesValue(ITy->getBitWidth()));
147 if (Ty->isFloatingPointTy()) {
148 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
149 !Ty->isPPC_FP128Ty());
150 return ConstantFP::get(Ty->getContext(), FL);
153 VectorType *VTy = cast<VectorType>(Ty);
154 return ConstantVector::getSplat(VTy->getNumElements(),
155 getAllOnesValue(VTy->getElementType()));
158 /// getAggregateElement - For aggregates (struct/array/vector) return the
159 /// constant that corresponds to the specified element if possible, or null if
160 /// not. This can return null if the element index is a ConstantExpr, or if
161 /// 'this' is a constant expr.
162 Constant *Constant::getAggregateElement(unsigned Elt) const {
163 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
164 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
166 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
167 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
169 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
170 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
172 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
173 return CAZ->getElementValue(Elt);
175 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
176 return UV->getElementValue(Elt);
178 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
179 return CDS->getElementAsConstant(Elt);
183 Constant *Constant::getAggregateElement(Constant *Elt) const {
184 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
185 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
186 return getAggregateElement(CI->getZExtValue());
191 void Constant::destroyConstantImpl() {
192 // When a Constant is destroyed, there may be lingering
193 // references to the constant by other constants in the constant pool. These
194 // constants are implicitly dependent on the module that is being deleted,
195 // but they don't know that. Because we only find out when the CPV is
196 // deleted, we must now notify all of our users (that should only be
197 // Constants) that they are, in fact, invalid now and should be deleted.
199 while (!use_empty()) {
200 Value *V = use_back();
201 #ifndef NDEBUG // Only in -g mode...
202 if (!isa<Constant>(V)) {
203 dbgs() << "While deleting: " << *this
204 << "\n\nUse still stuck around after Def is destroyed: "
208 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
209 cast<Constant>(V)->destroyConstant();
211 // The constant should remove itself from our use list...
212 assert((use_empty() || use_back() != V) && "Constant not removed!");
215 // Value has no outstanding references it is safe to delete it now...
219 /// canTrap - Return true if evaluation of this constant could trap. This is
220 /// true for things like constant expressions that could divide by zero.
221 bool Constant::canTrap() const {
222 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
223 // The only thing that could possibly trap are constant exprs.
224 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
225 if (!CE) return false;
227 // ConstantExpr traps if any operands can trap.
228 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
229 if (CE->getOperand(i)->canTrap())
232 // Otherwise, only specific operations can trap.
233 switch (CE->getOpcode()) {
236 case Instruction::UDiv:
237 case Instruction::SDiv:
238 case Instruction::FDiv:
239 case Instruction::URem:
240 case Instruction::SRem:
241 case Instruction::FRem:
242 // Div and rem can trap if the RHS is not known to be non-zero.
243 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
249 /// isConstantUsed - Return true if the constant has users other than constant
250 /// exprs and other dangling things.
251 bool Constant::isConstantUsed() const {
252 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
253 const Constant *UC = dyn_cast<Constant>(*UI);
254 if (UC == 0 || isa<GlobalValue>(UC))
257 if (UC->isConstantUsed())
265 /// getRelocationInfo - This method classifies the entry according to
266 /// whether or not it may generate a relocation entry. This must be
267 /// conservative, so if it might codegen to a relocatable entry, it should say
268 /// so. The return values are:
270 /// NoRelocation: This constant pool entry is guaranteed to never have a
271 /// relocation applied to it (because it holds a simple constant like
273 /// LocalRelocation: This entry has relocations, but the entries are
274 /// guaranteed to be resolvable by the static linker, so the dynamic
275 /// linker will never see them.
276 /// GlobalRelocations: This entry may have arbitrary relocations.
278 /// FIXME: This really should not be in VMCore.
279 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
280 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
281 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
282 return LocalRelocation; // Local to this file/library.
283 return GlobalRelocations; // Global reference.
286 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
287 return BA->getFunction()->getRelocationInfo();
289 // While raw uses of blockaddress need to be relocated, differences between
290 // two of them don't when they are for labels in the same function. This is a
291 // common idiom when creating a table for the indirect goto extension, so we
292 // handle it efficiently here.
293 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
294 if (CE->getOpcode() == Instruction::Sub) {
295 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
296 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
298 LHS->getOpcode() == Instruction::PtrToInt &&
299 RHS->getOpcode() == Instruction::PtrToInt &&
300 isa<BlockAddress>(LHS->getOperand(0)) &&
301 isa<BlockAddress>(RHS->getOperand(0)) &&
302 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
303 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
307 PossibleRelocationsTy Result = NoRelocation;
308 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
309 Result = std::max(Result,
310 cast<Constant>(getOperand(i))->getRelocationInfo());
315 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
316 /// it. This involves recursively eliminating any dead users of the
318 static bool removeDeadUsersOfConstant(const Constant *C) {
319 if (isa<GlobalValue>(C)) return false; // Cannot remove this
321 while (!C->use_empty()) {
322 const Constant *User = dyn_cast<Constant>(C->use_back());
323 if (!User) return false; // Non-constant usage;
324 if (!removeDeadUsersOfConstant(User))
325 return false; // Constant wasn't dead
328 const_cast<Constant*>(C)->destroyConstant();
333 /// removeDeadConstantUsers - If there are any dead constant users dangling
334 /// off of this constant, remove them. This method is useful for clients
335 /// that want to check to see if a global is unused, but don't want to deal
336 /// with potentially dead constants hanging off of the globals.
337 void Constant::removeDeadConstantUsers() const {
338 Value::const_use_iterator I = use_begin(), E = use_end();
339 Value::const_use_iterator LastNonDeadUser = E;
341 const Constant *User = dyn_cast<Constant>(*I);
348 if (!removeDeadUsersOfConstant(User)) {
349 // If the constant wasn't dead, remember that this was the last live use
350 // and move on to the next constant.
356 // If the constant was dead, then the iterator is invalidated.
357 if (LastNonDeadUser == E) {
369 //===----------------------------------------------------------------------===//
371 //===----------------------------------------------------------------------===//
373 void ConstantInt::anchor() { }
375 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
376 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
377 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
380 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
381 LLVMContextImpl *pImpl = Context.pImpl;
382 if (!pImpl->TheTrueVal)
383 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
384 return pImpl->TheTrueVal;
387 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
388 LLVMContextImpl *pImpl = Context.pImpl;
389 if (!pImpl->TheFalseVal)
390 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
391 return pImpl->TheFalseVal;
394 Constant *ConstantInt::getTrue(Type *Ty) {
395 VectorType *VTy = dyn_cast<VectorType>(Ty);
397 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
398 return ConstantInt::getTrue(Ty->getContext());
400 assert(VTy->getElementType()->isIntegerTy(1) &&
401 "True must be vector of i1 or i1.");
402 return ConstantVector::getSplat(VTy->getNumElements(),
403 ConstantInt::getTrue(Ty->getContext()));
406 Constant *ConstantInt::getFalse(Type *Ty) {
407 VectorType *VTy = dyn_cast<VectorType>(Ty);
409 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
410 return ConstantInt::getFalse(Ty->getContext());
412 assert(VTy->getElementType()->isIntegerTy(1) &&
413 "False must be vector of i1 or i1.");
414 return ConstantVector::getSplat(VTy->getNumElements(),
415 ConstantInt::getFalse(Ty->getContext()));
419 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
420 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
421 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
422 // compare APInt's of different widths, which would violate an APInt class
423 // invariant which generates an assertion.
424 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
425 // Get the corresponding integer type for the bit width of the value.
426 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
427 // get an existing value or the insertion position
428 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
429 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
430 if (!Slot) Slot = new ConstantInt(ITy, V);
434 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
435 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
437 // For vectors, broadcast the value.
438 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
439 return ConstantVector::getSplat(VTy->getNumElements(), C);
444 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
446 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
449 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
450 return get(Ty, V, true);
453 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
454 return get(Ty, V, true);
457 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
458 ConstantInt *C = get(Ty->getContext(), V);
459 assert(C->getType() == Ty->getScalarType() &&
460 "ConstantInt type doesn't match the type implied by its value!");
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, StringRef Str,
471 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
474 //===----------------------------------------------------------------------===//
476 //===----------------------------------------------------------------------===//
478 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
480 return &APFloat::IEEEhalf;
482 return &APFloat::IEEEsingle;
483 if (Ty->isDoubleTy())
484 return &APFloat::IEEEdouble;
485 if (Ty->isX86_FP80Ty())
486 return &APFloat::x87DoubleExtended;
487 else if (Ty->isFP128Ty())
488 return &APFloat::IEEEquad;
490 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
491 return &APFloat::PPCDoubleDouble;
494 void ConstantFP::anchor() { }
496 /// get() - This returns a constant fp for the specified value in the
497 /// specified type. This should only be used for simple constant values like
498 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
499 Constant *ConstantFP::get(Type* Ty, double V) {
500 LLVMContext &Context = Ty->getContext();
504 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
505 APFloat::rmNearestTiesToEven, &ignored);
506 Constant *C = get(Context, FV);
508 // For vectors, broadcast the value.
509 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
510 return ConstantVector::getSplat(VTy->getNumElements(), C);
516 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
517 LLVMContext &Context = Ty->getContext();
519 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
520 Constant *C = get(Context, FV);
522 // For vectors, broadcast the value.
523 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
524 return ConstantVector::getSplat(VTy->getNumElements(), C);
530 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
531 LLVMContext &Context = Ty->getContext();
532 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
534 return get(Context, apf);
538 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
539 Type *ScalarTy = Ty->getScalarType();
540 if (ScalarTy->isFloatingPointTy()) {
541 Constant *C = getNegativeZero(ScalarTy);
542 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
543 return ConstantVector::getSplat(VTy->getNumElements(), C);
547 return Constant::getNullValue(Ty);
551 // ConstantFP accessors.
552 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
553 DenseMapAPFloatKeyInfo::KeyTy Key(V);
555 LLVMContextImpl* pImpl = Context.pImpl;
557 ConstantFP *&Slot = pImpl->FPConstants[Key];
561 if (&V.getSemantics() == &APFloat::IEEEhalf)
562 Ty = Type::getHalfTy(Context);
563 else if (&V.getSemantics() == &APFloat::IEEEsingle)
564 Ty = Type::getFloatTy(Context);
565 else if (&V.getSemantics() == &APFloat::IEEEdouble)
566 Ty = Type::getDoubleTy(Context);
567 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
568 Ty = Type::getX86_FP80Ty(Context);
569 else if (&V.getSemantics() == &APFloat::IEEEquad)
570 Ty = Type::getFP128Ty(Context);
572 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
573 "Unknown FP format");
574 Ty = Type::getPPC_FP128Ty(Context);
576 Slot = new ConstantFP(Ty, V);
582 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
583 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
584 return ConstantFP::get(Ty->getContext(),
585 APFloat::getInf(Semantics, Negative));
588 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
589 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
590 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
594 bool ConstantFP::isExactlyValue(const APFloat &V) const {
595 return Val.bitwiseIsEqual(V);
598 //===----------------------------------------------------------------------===//
599 // ConstantAggregateZero Implementation
600 //===----------------------------------------------------------------------===//
602 /// getSequentialElement - If this CAZ has array or vector type, return a zero
603 /// with the right element type.
604 Constant *ConstantAggregateZero::getSequentialElement() const {
605 return Constant::getNullValue(getType()->getSequentialElementType());
608 /// getStructElement - If this CAZ has struct type, return a zero with the
609 /// right element type for the specified element.
610 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
611 return Constant::getNullValue(getType()->getStructElementType(Elt));
614 /// getElementValue - Return a zero of the right value for the specified GEP
615 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
616 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
617 if (isa<SequentialType>(getType()))
618 return getSequentialElement();
619 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
622 /// getElementValue - Return a zero of the right value for the specified GEP
624 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
625 if (isa<SequentialType>(getType()))
626 return getSequentialElement();
627 return getStructElement(Idx);
631 //===----------------------------------------------------------------------===//
632 // UndefValue Implementation
633 //===----------------------------------------------------------------------===//
635 /// getSequentialElement - If this undef has array or vector type, return an
636 /// undef with the right element type.
637 UndefValue *UndefValue::getSequentialElement() const {
638 return UndefValue::get(getType()->getSequentialElementType());
641 /// getStructElement - If this undef has struct type, return a zero with the
642 /// right element type for the specified element.
643 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
644 return UndefValue::get(getType()->getStructElementType(Elt));
647 /// getElementValue - Return an undef of the right value for the specified GEP
648 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
649 UndefValue *UndefValue::getElementValue(Constant *C) const {
650 if (isa<SequentialType>(getType()))
651 return getSequentialElement();
652 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
655 /// getElementValue - Return an undef of the right value for the specified GEP
657 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
658 if (isa<SequentialType>(getType()))
659 return getSequentialElement();
660 return getStructElement(Idx);
665 //===----------------------------------------------------------------------===//
666 // ConstantXXX Classes
667 //===----------------------------------------------------------------------===//
670 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
671 : Constant(T, ConstantArrayVal,
672 OperandTraits<ConstantArray>::op_end(this) - V.size(),
674 assert(V.size() == T->getNumElements() &&
675 "Invalid initializer vector for constant array");
676 for (unsigned i = 0, e = V.size(); i != e; ++i)
677 assert(V[i]->getType() == T->getElementType() &&
678 "Initializer for array element doesn't match array element type!");
679 std::copy(V.begin(), V.end(), op_begin());
682 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
683 for (unsigned i = 0, e = V.size(); i != e; ++i) {
684 assert(V[i]->getType() == Ty->getElementType() &&
685 "Wrong type in array element initializer");
687 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
688 // If this is an all-zero array, return a ConstantAggregateZero object
689 bool isAllZero = true;
690 bool isUndef = false;
693 isAllZero = C->isNullValue();
694 isUndef = isa<UndefValue>(C);
696 if (isAllZero || isUndef)
697 for (unsigned i = 1, e = V.size(); i != e; ++i)
706 return ConstantAggregateZero::get(Ty);
708 return UndefValue::get(Ty);
709 return pImpl->ArrayConstants.getOrCreate(Ty, V);
712 /// ConstantArray::get(const string&) - Return an array that is initialized to
713 /// contain the specified string. If length is zero then a null terminator is
714 /// added to the specified string so that it may be used in a natural way.
715 /// Otherwise, the length parameter specifies how much of the string to use
716 /// and it won't be null terminated.
718 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
720 std::vector<Constant*> ElementVals;
721 ElementVals.reserve(Str.size() + size_t(AddNull));
722 for (unsigned i = 0; i < Str.size(); ++i)
723 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
725 // Add a null terminator to the string...
727 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
729 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
730 return get(ATy, ElementVals);
733 /// getTypeForElements - Return an anonymous struct type to use for a constant
734 /// with the specified set of elements. The list must not be empty.
735 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
736 ArrayRef<Constant*> V,
738 SmallVector<Type*, 16> EltTypes;
739 for (unsigned i = 0, e = V.size(); i != e; ++i)
740 EltTypes.push_back(V[i]->getType());
742 return StructType::get(Context, EltTypes, Packed);
746 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
749 "ConstantStruct::getTypeForElements cannot be called on empty list");
750 return getTypeForElements(V[0]->getContext(), V, Packed);
754 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
755 : Constant(T, ConstantStructVal,
756 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
758 assert(V.size() == T->getNumElements() &&
759 "Invalid initializer vector for constant structure");
760 for (unsigned i = 0, e = V.size(); i != e; ++i)
761 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
762 "Initializer for struct element doesn't match struct element type!");
763 std::copy(V.begin(), V.end(), op_begin());
766 // ConstantStruct accessors.
767 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
768 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
769 "Incorrect # elements specified to ConstantStruct::get");
771 // Create a ConstantAggregateZero value if all elements are zeros.
773 bool isUndef = false;
776 isUndef = isa<UndefValue>(V[0]);
777 isZero = V[0]->isNullValue();
778 if (isUndef || isZero) {
779 for (unsigned i = 0, e = V.size(); i != e; ++i) {
780 if (!V[i]->isNullValue())
782 if (!isa<UndefValue>(V[i]))
788 return ConstantAggregateZero::get(ST);
790 return UndefValue::get(ST);
792 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
795 Constant *ConstantStruct::get(StructType *T, ...) {
797 SmallVector<Constant*, 8> Values;
799 while (Constant *Val = va_arg(ap, llvm::Constant*))
800 Values.push_back(Val);
802 return get(T, Values);
805 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
806 : Constant(T, ConstantVectorVal,
807 OperandTraits<ConstantVector>::op_end(this) - V.size(),
809 for (size_t i = 0, e = V.size(); i != e; i++)
810 assert(V[i]->getType() == T->getElementType() &&
811 "Initializer for vector element doesn't match vector element type!");
812 std::copy(V.begin(), V.end(), op_begin());
815 // ConstantVector accessors.
816 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
817 assert(!V.empty() && "Vectors can't be empty");
818 VectorType *T = VectorType::get(V.front()->getType(), V.size());
819 LLVMContextImpl *pImpl = T->getContext().pImpl;
821 // If this is an all-undef or all-zero vector, return a
822 // ConstantAggregateZero or UndefValue.
824 bool isZero = C->isNullValue();
825 bool isUndef = isa<UndefValue>(C);
827 if (isZero || isUndef) {
828 for (unsigned i = 1, e = V.size(); i != e; ++i)
830 isZero = isUndef = false;
836 return ConstantAggregateZero::get(T);
838 return UndefValue::get(T);
840 return pImpl->VectorConstants.getOrCreate(T, V);
843 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
844 SmallVector<Constant*, 32> Elts(NumElts, V);
849 // Utility function for determining if a ConstantExpr is a CastOp or not. This
850 // can't be inline because we don't want to #include Instruction.h into
852 bool ConstantExpr::isCast() const {
853 return Instruction::isCast(getOpcode());
856 bool ConstantExpr::isCompare() const {
857 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
860 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
861 if (getOpcode() != Instruction::GetElementPtr) return false;
863 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
864 User::const_op_iterator OI = llvm::next(this->op_begin());
866 // Skip the first index, as it has no static limit.
870 // The remaining indices must be compile-time known integers within the
871 // bounds of the corresponding notional static array types.
872 for (; GEPI != E; ++GEPI, ++OI) {
873 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
874 if (!CI) return false;
875 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
876 if (CI->getValue().getActiveBits() > 64 ||
877 CI->getZExtValue() >= ATy->getNumElements())
881 // All the indices checked out.
885 bool ConstantExpr::hasIndices() const {
886 return getOpcode() == Instruction::ExtractValue ||
887 getOpcode() == Instruction::InsertValue;
890 ArrayRef<unsigned> ConstantExpr::getIndices() const {
891 if (const ExtractValueConstantExpr *EVCE =
892 dyn_cast<ExtractValueConstantExpr>(this))
893 return EVCE->Indices;
895 return cast<InsertValueConstantExpr>(this)->Indices;
898 unsigned ConstantExpr::getPredicate() const {
900 return ((const CompareConstantExpr*)this)->predicate;
903 /// getWithOperandReplaced - Return a constant expression identical to this
904 /// one, but with the specified operand set to the specified value.
906 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
907 assert(Op->getType() == getOperand(OpNo)->getType() &&
908 "Replacing operand with value of different type!");
909 if (getOperand(OpNo) == Op)
910 return const_cast<ConstantExpr*>(this);
912 SmallVector<Constant*, 8> NewOps;
913 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
914 NewOps.push_back(i == OpNo ? Op : getOperand(i));
916 return getWithOperands(NewOps);
919 /// getWithOperands - This returns the current constant expression with the
920 /// operands replaced with the specified values. The specified array must
921 /// have the same number of operands as our current one.
922 Constant *ConstantExpr::
923 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
924 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
925 bool AnyChange = Ty != getType();
926 for (unsigned i = 0; i != Ops.size(); ++i)
927 AnyChange |= Ops[i] != getOperand(i);
929 if (!AnyChange) // No operands changed, return self.
930 return const_cast<ConstantExpr*>(this);
932 switch (getOpcode()) {
933 case Instruction::Trunc:
934 case Instruction::ZExt:
935 case Instruction::SExt:
936 case Instruction::FPTrunc:
937 case Instruction::FPExt:
938 case Instruction::UIToFP:
939 case Instruction::SIToFP:
940 case Instruction::FPToUI:
941 case Instruction::FPToSI:
942 case Instruction::PtrToInt:
943 case Instruction::IntToPtr:
944 case Instruction::BitCast:
945 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
946 case Instruction::Select:
947 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
948 case Instruction::InsertElement:
949 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
950 case Instruction::ExtractElement:
951 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
952 case Instruction::InsertValue:
953 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices());
954 case Instruction::ExtractValue:
955 return ConstantExpr::getExtractValue(Ops[0], getIndices());
956 case Instruction::ShuffleVector:
957 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
958 case Instruction::GetElementPtr:
959 return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
960 cast<GEPOperator>(this)->isInBounds());
961 case Instruction::ICmp:
962 case Instruction::FCmp:
963 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
965 assert(getNumOperands() == 2 && "Must be binary operator?");
966 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
971 //===----------------------------------------------------------------------===//
972 // isValueValidForType implementations
974 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
975 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
976 if (Ty->isIntegerTy(1))
977 return Val == 0 || Val == 1;
979 return true; // always true, has to fit in largest type
980 uint64_t Max = (1ll << NumBits) - 1;
984 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
985 unsigned NumBits = Ty->getIntegerBitWidth();
986 if (Ty->isIntegerTy(1))
987 return Val == 0 || Val == 1 || Val == -1;
989 return true; // always true, has to fit in largest type
990 int64_t Min = -(1ll << (NumBits-1));
991 int64_t Max = (1ll << (NumBits-1)) - 1;
992 return (Val >= Min && Val <= Max);
995 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
996 // convert modifies in place, so make a copy.
997 APFloat Val2 = APFloat(Val);
999 switch (Ty->getTypeID()) {
1001 return false; // These can't be represented as floating point!
1003 // FIXME rounding mode needs to be more flexible
1004 case Type::HalfTyID: {
1005 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1007 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1010 case Type::FloatTyID: {
1011 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1013 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1016 case Type::DoubleTyID: {
1017 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1018 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1019 &Val2.getSemantics() == &APFloat::IEEEdouble)
1021 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1024 case Type::X86_FP80TyID:
1025 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1026 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1027 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1028 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1029 case Type::FP128TyID:
1030 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1031 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1032 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1033 &Val2.getSemantics() == &APFloat::IEEEquad;
1034 case Type::PPC_FP128TyID:
1035 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1036 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1037 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1038 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1043 //===----------------------------------------------------------------------===//
1044 // Factory Function Implementation
1046 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1047 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1048 "Cannot create an aggregate zero of non-aggregate type!");
1050 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1052 Entry = new ConstantAggregateZero(Ty);
1057 /// destroyConstant - Remove the constant from the constant table.
1059 void ConstantAggregateZero::destroyConstant() {
1060 getContext().pImpl->CAZConstants.erase(getType());
1061 destroyConstantImpl();
1064 /// destroyConstant - Remove the constant from the constant table...
1066 void ConstantArray::destroyConstant() {
1067 getType()->getContext().pImpl->ArrayConstants.remove(this);
1068 destroyConstantImpl();
1071 /// isString - This method returns true if the array is an array of i8, and
1072 /// if the elements of the array are all ConstantInt's.
1073 bool ConstantArray::isString() const {
1074 // Check the element type for i8...
1075 if (!getType()->getElementType()->isIntegerTy(8))
1077 // Check the elements to make sure they are all integers, not constant
1079 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1080 if (!isa<ConstantInt>(getOperand(i)))
1085 /// isCString - This method returns true if the array is a string (see
1086 /// isString) and it ends in a null byte \\0 and does not contains any other
1087 /// null bytes except its terminator.
1088 bool ConstantArray::isCString() const {
1089 // Check the element type for i8...
1090 if (!getType()->getElementType()->isIntegerTy(8))
1093 // Last element must be a null.
1094 if (!getOperand(getNumOperands()-1)->isNullValue())
1096 // Other elements must be non-null integers.
1097 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1098 if (!isa<ConstantInt>(getOperand(i)))
1100 if (getOperand(i)->isNullValue())
1107 /// convertToString - Helper function for getAsString() and getAsCString().
1108 static std::string convertToString(const User *U, unsigned len) {
1110 Result.reserve(len);
1111 for (unsigned i = 0; i != len; ++i)
1112 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1116 /// getAsString - If this array is isString(), then this method converts the
1117 /// array to an std::string and returns it. Otherwise, it asserts out.
1119 std::string ConstantArray::getAsString() const {
1120 assert(isString() && "Not a string!");
1121 return convertToString(this, getNumOperands());
1125 /// getAsCString - If this array is isCString(), then this method converts the
1126 /// array (without the trailing null byte) to an std::string and returns it.
1127 /// Otherwise, it asserts out.
1129 std::string ConstantArray::getAsCString() const {
1130 assert(isCString() && "Not a string!");
1131 return convertToString(this, getNumOperands() - 1);
1135 //---- ConstantStruct::get() implementation...
1138 // destroyConstant - Remove the constant from the constant table...
1140 void ConstantStruct::destroyConstant() {
1141 getType()->getContext().pImpl->StructConstants.remove(this);
1142 destroyConstantImpl();
1145 // destroyConstant - Remove the constant from the constant table...
1147 void ConstantVector::destroyConstant() {
1148 getType()->getContext().pImpl->VectorConstants.remove(this);
1149 destroyConstantImpl();
1152 /// getSplatValue - If this is a splat constant, where all of the
1153 /// elements have the same value, return that value. Otherwise return null.
1154 Constant *ConstantVector::getSplatValue() const {
1155 // Check out first element.
1156 Constant *Elt = getOperand(0);
1157 // Then make sure all remaining elements point to the same value.
1158 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1159 if (getOperand(I) != Elt)
1164 //---- ConstantPointerNull::get() implementation.
1167 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1168 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1170 Entry = new ConstantPointerNull(Ty);
1175 // destroyConstant - Remove the constant from the constant table...
1177 void ConstantPointerNull::destroyConstant() {
1178 getContext().pImpl->CPNConstants.erase(getType());
1179 // Free the constant and any dangling references to it.
1180 destroyConstantImpl();
1184 //---- UndefValue::get() implementation.
1187 UndefValue *UndefValue::get(Type *Ty) {
1188 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1190 Entry = new UndefValue(Ty);
1195 // destroyConstant - Remove the constant from the constant table.
1197 void UndefValue::destroyConstant() {
1198 // Free the constant and any dangling references to it.
1199 getContext().pImpl->UVConstants.erase(getType());
1200 destroyConstantImpl();
1203 //---- BlockAddress::get() implementation.
1206 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1207 assert(BB->getParent() != 0 && "Block must have a parent");
1208 return get(BB->getParent(), BB);
1211 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1213 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1215 BA = new BlockAddress(F, BB);
1217 assert(BA->getFunction() == F && "Basic block moved between functions");
1221 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1222 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1226 BB->AdjustBlockAddressRefCount(1);
1230 // destroyConstant - Remove the constant from the constant table.
1232 void BlockAddress::destroyConstant() {
1233 getFunction()->getType()->getContext().pImpl
1234 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1235 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1236 destroyConstantImpl();
1239 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1240 // This could be replacing either the Basic Block or the Function. In either
1241 // case, we have to remove the map entry.
1242 Function *NewF = getFunction();
1243 BasicBlock *NewBB = getBasicBlock();
1246 NewF = cast<Function>(To);
1248 NewBB = cast<BasicBlock>(To);
1250 // See if the 'new' entry already exists, if not, just update this in place
1251 // and return early.
1252 BlockAddress *&NewBA =
1253 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1255 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1257 // Remove the old entry, this can't cause the map to rehash (just a
1258 // tombstone will get added).
1259 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1262 setOperand(0, NewF);
1263 setOperand(1, NewBB);
1264 getBasicBlock()->AdjustBlockAddressRefCount(1);
1268 // Otherwise, I do need to replace this with an existing value.
1269 assert(NewBA != this && "I didn't contain From!");
1271 // Everyone using this now uses the replacement.
1272 replaceAllUsesWith(NewBA);
1277 //---- ConstantExpr::get() implementations.
1280 /// This is a utility function to handle folding of casts and lookup of the
1281 /// cast in the ExprConstants map. It is used by the various get* methods below.
1282 static inline Constant *getFoldedCast(
1283 Instruction::CastOps opc, Constant *C, Type *Ty) {
1284 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1285 // Fold a few common cases
1286 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1289 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1291 // Look up the constant in the table first to ensure uniqueness
1292 std::vector<Constant*> argVec(1, C);
1293 ExprMapKeyType Key(opc, argVec);
1295 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1298 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1299 Instruction::CastOps opc = Instruction::CastOps(oc);
1300 assert(Instruction::isCast(opc) && "opcode out of range");
1301 assert(C && Ty && "Null arguments to getCast");
1302 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1306 llvm_unreachable("Invalid cast opcode");
1307 case Instruction::Trunc: return getTrunc(C, Ty);
1308 case Instruction::ZExt: return getZExt(C, Ty);
1309 case Instruction::SExt: return getSExt(C, Ty);
1310 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1311 case Instruction::FPExt: return getFPExtend(C, Ty);
1312 case Instruction::UIToFP: return getUIToFP(C, Ty);
1313 case Instruction::SIToFP: return getSIToFP(C, Ty);
1314 case Instruction::FPToUI: return getFPToUI(C, Ty);
1315 case Instruction::FPToSI: return getFPToSI(C, Ty);
1316 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1317 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1318 case Instruction::BitCast: return getBitCast(C, Ty);
1322 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1323 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1324 return getBitCast(C, Ty);
1325 return getZExt(C, Ty);
1328 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1329 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1330 return getBitCast(C, Ty);
1331 return getSExt(C, Ty);
1334 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1335 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1336 return getBitCast(C, Ty);
1337 return getTrunc(C, Ty);
1340 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1341 assert(S->getType()->isPointerTy() && "Invalid cast");
1342 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1344 if (Ty->isIntegerTy())
1345 return getPtrToInt(S, Ty);
1346 return getBitCast(S, Ty);
1349 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1351 assert(C->getType()->isIntOrIntVectorTy() &&
1352 Ty->isIntOrIntVectorTy() && "Invalid cast");
1353 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1354 unsigned DstBits = Ty->getScalarSizeInBits();
1355 Instruction::CastOps opcode =
1356 (SrcBits == DstBits ? Instruction::BitCast :
1357 (SrcBits > DstBits ? Instruction::Trunc :
1358 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1359 return getCast(opcode, C, Ty);
1362 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1363 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1365 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1366 unsigned DstBits = Ty->getScalarSizeInBits();
1367 if (SrcBits == DstBits)
1368 return C; // Avoid a useless cast
1369 Instruction::CastOps opcode =
1370 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1371 return getCast(opcode, C, Ty);
1374 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1376 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1377 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1379 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1380 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1381 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1382 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1383 "SrcTy must be larger than DestTy for Trunc!");
1385 return getFoldedCast(Instruction::Trunc, C, Ty);
1388 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1390 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1391 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1393 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1394 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1395 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1396 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1397 "SrcTy must be smaller than DestTy for SExt!");
1399 return getFoldedCast(Instruction::SExt, C, Ty);
1402 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1404 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1405 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1407 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1408 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1409 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1410 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1411 "SrcTy must be smaller than DestTy for ZExt!");
1413 return getFoldedCast(Instruction::ZExt, C, Ty);
1416 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1418 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1419 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1421 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1422 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1423 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1424 "This is an illegal floating point truncation!");
1425 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1428 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1430 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1431 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1433 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1434 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1435 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1436 "This is an illegal floating point extension!");
1437 return getFoldedCast(Instruction::FPExt, C, Ty);
1440 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1442 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1443 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1445 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1446 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1447 "This is an illegal uint to floating point cast!");
1448 return getFoldedCast(Instruction::UIToFP, C, Ty);
1451 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1453 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1454 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1456 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1457 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1458 "This is an illegal sint to floating point cast!");
1459 return getFoldedCast(Instruction::SIToFP, C, Ty);
1462 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1464 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1465 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1467 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1468 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1469 "This is an illegal floating point to uint cast!");
1470 return getFoldedCast(Instruction::FPToUI, C, Ty);
1473 Constant *ConstantExpr::getFPToSI(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->isIntOrIntVectorTy() &&
1480 "This is an illegal floating point to sint cast!");
1481 return getFoldedCast(Instruction::FPToSI, C, Ty);
1484 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1485 assert(C->getType()->getScalarType()->isPointerTy() &&
1486 "PtrToInt source must be pointer or pointer vector");
1487 assert(DstTy->getScalarType()->isIntegerTy() &&
1488 "PtrToInt destination must be integer or integer vector");
1489 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1490 if (isa<VectorType>(C->getType()))
1491 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1492 "Invalid cast between a different number of vector elements");
1493 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1496 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1497 assert(C->getType()->getScalarType()->isIntegerTy() &&
1498 "IntToPtr source must be integer or integer vector");
1499 assert(DstTy->getScalarType()->isPointerTy() &&
1500 "IntToPtr destination must be a pointer or pointer vector");
1501 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1502 if (isa<VectorType>(C->getType()))
1503 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1504 "Invalid cast between a different number of vector elements");
1505 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1508 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1509 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1510 "Invalid constantexpr bitcast!");
1512 // It is common to ask for a bitcast of a value to its own type, handle this
1514 if (C->getType() == DstTy) return C;
1516 return getFoldedCast(Instruction::BitCast, C, DstTy);
1519 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1521 // Check the operands for consistency first.
1522 assert(Opcode >= Instruction::BinaryOpsBegin &&
1523 Opcode < Instruction::BinaryOpsEnd &&
1524 "Invalid opcode in binary constant expression");
1525 assert(C1->getType() == C2->getType() &&
1526 "Operand types in binary constant expression should match");
1530 case Instruction::Add:
1531 case Instruction::Sub:
1532 case Instruction::Mul:
1533 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1534 assert(C1->getType()->isIntOrIntVectorTy() &&
1535 "Tried to create an integer operation on a non-integer type!");
1537 case Instruction::FAdd:
1538 case Instruction::FSub:
1539 case Instruction::FMul:
1540 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1541 assert(C1->getType()->isFPOrFPVectorTy() &&
1542 "Tried to create a floating-point operation on a "
1543 "non-floating-point type!");
1545 case Instruction::UDiv:
1546 case Instruction::SDiv:
1547 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1548 assert(C1->getType()->isIntOrIntVectorTy() &&
1549 "Tried to create an arithmetic operation on a non-arithmetic type!");
1551 case Instruction::FDiv:
1552 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1553 assert(C1->getType()->isFPOrFPVectorTy() &&
1554 "Tried to create an arithmetic operation on a non-arithmetic type!");
1556 case Instruction::URem:
1557 case Instruction::SRem:
1558 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1559 assert(C1->getType()->isIntOrIntVectorTy() &&
1560 "Tried to create an arithmetic operation on a non-arithmetic type!");
1562 case Instruction::FRem:
1563 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1564 assert(C1->getType()->isFPOrFPVectorTy() &&
1565 "Tried to create an arithmetic operation on a non-arithmetic type!");
1567 case Instruction::And:
1568 case Instruction::Or:
1569 case Instruction::Xor:
1570 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1571 assert(C1->getType()->isIntOrIntVectorTy() &&
1572 "Tried to create a logical operation on a non-integral type!");
1574 case Instruction::Shl:
1575 case Instruction::LShr:
1576 case Instruction::AShr:
1577 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1578 assert(C1->getType()->isIntOrIntVectorTy() &&
1579 "Tried to create a shift operation on a non-integer type!");
1586 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1587 return FC; // Fold a few common cases.
1589 std::vector<Constant*> argVec(1, C1);
1590 argVec.push_back(C2);
1591 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1593 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1594 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1597 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1598 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1599 // Note that a non-inbounds gep is used, as null isn't within any object.
1600 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1601 Constant *GEP = getGetElementPtr(
1602 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1603 return getPtrToInt(GEP,
1604 Type::getInt64Ty(Ty->getContext()));
1607 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1608 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1609 // Note that a non-inbounds gep is used, as null isn't within any object.
1611 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1612 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1613 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1614 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1615 Constant *Indices[2] = { Zero, One };
1616 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1617 return getPtrToInt(GEP,
1618 Type::getInt64Ty(Ty->getContext()));
1621 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1622 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1626 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1627 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1628 // Note that a non-inbounds gep is used, as null isn't within any object.
1629 Constant *GEPIdx[] = {
1630 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1633 Constant *GEP = getGetElementPtr(
1634 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1635 return getPtrToInt(GEP,
1636 Type::getInt64Ty(Ty->getContext()));
1639 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1640 Constant *C1, Constant *C2) {
1641 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1643 switch (Predicate) {
1644 default: llvm_unreachable("Invalid CmpInst predicate");
1645 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1646 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1647 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1648 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1649 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1650 case CmpInst::FCMP_TRUE:
1651 return getFCmp(Predicate, C1, C2);
1653 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1654 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1655 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1656 case CmpInst::ICMP_SLE:
1657 return getICmp(Predicate, C1, C2);
1661 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1662 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1664 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1665 return SC; // Fold common cases
1667 std::vector<Constant*> argVec(3, C);
1670 ExprMapKeyType Key(Instruction::Select, argVec);
1672 LLVMContextImpl *pImpl = C->getContext().pImpl;
1673 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1676 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1678 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1679 return FC; // Fold a few common cases.
1681 // Get the result type of the getelementptr!
1682 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1683 assert(Ty && "GEP indices invalid!");
1684 unsigned AS = C->getType()->getPointerAddressSpace();
1685 Type *ReqTy = Ty->getPointerTo(AS);
1687 assert(C->getType()->isPointerTy() &&
1688 "Non-pointer type for constant GetElementPtr expression");
1689 // Look up the constant in the table first to ensure uniqueness
1690 std::vector<Constant*> ArgVec;
1691 ArgVec.reserve(1 + Idxs.size());
1692 ArgVec.push_back(C);
1693 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1694 ArgVec.push_back(cast<Constant>(Idxs[i]));
1695 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1696 InBounds ? GEPOperator::IsInBounds : 0);
1698 LLVMContextImpl *pImpl = C->getContext().pImpl;
1699 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1703 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1704 assert(LHS->getType() == RHS->getType());
1705 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1706 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1708 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1709 return FC; // Fold a few common cases...
1711 // Look up the constant in the table first to ensure uniqueness
1712 std::vector<Constant*> ArgVec;
1713 ArgVec.push_back(LHS);
1714 ArgVec.push_back(RHS);
1715 // Get the key type with both the opcode and predicate
1716 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1718 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1719 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1720 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1722 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1723 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1727 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1728 assert(LHS->getType() == RHS->getType());
1729 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1731 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1732 return FC; // Fold a few common cases...
1734 // Look up the constant in the table first to ensure uniqueness
1735 std::vector<Constant*> ArgVec;
1736 ArgVec.push_back(LHS);
1737 ArgVec.push_back(RHS);
1738 // Get the key type with both the opcode and predicate
1739 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1741 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1742 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1743 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1745 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1746 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1749 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1750 assert(Val->getType()->isVectorTy() &&
1751 "Tried to create extractelement operation on non-vector type!");
1752 assert(Idx->getType()->isIntegerTy(32) &&
1753 "Extractelement index must be i32 type!");
1755 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1756 return FC; // Fold a few common cases.
1758 // Look up the constant in the table first to ensure uniqueness
1759 std::vector<Constant*> ArgVec(1, Val);
1760 ArgVec.push_back(Idx);
1761 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1763 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1764 Type *ReqTy = Val->getType()->getVectorElementType();
1765 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1768 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1770 assert(Val->getType()->isVectorTy() &&
1771 "Tried to create insertelement operation on non-vector type!");
1772 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1773 "Insertelement types must match!");
1774 assert(Idx->getType()->isIntegerTy(32) &&
1775 "Insertelement index must be i32 type!");
1777 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1778 return FC; // Fold a few common cases.
1779 // Look up the constant in the table first to ensure uniqueness
1780 std::vector<Constant*> ArgVec(1, Val);
1781 ArgVec.push_back(Elt);
1782 ArgVec.push_back(Idx);
1783 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1785 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1786 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1789 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1791 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1792 "Invalid shuffle vector constant expr operands!");
1794 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1795 return FC; // Fold a few common cases.
1797 unsigned NElts = Mask->getType()->getVectorNumElements();
1798 Type *EltTy = V1->getType()->getVectorElementType();
1799 Type *ShufTy = VectorType::get(EltTy, NElts);
1801 // Look up the constant in the table first to ensure uniqueness
1802 std::vector<Constant*> ArgVec(1, V1);
1803 ArgVec.push_back(V2);
1804 ArgVec.push_back(Mask);
1805 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1807 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1808 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1811 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1812 ArrayRef<unsigned> Idxs) {
1813 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1814 Idxs) == Val->getType() &&
1815 "insertvalue indices invalid!");
1816 assert(Agg->getType()->isFirstClassType() &&
1817 "Non-first-class type for constant insertvalue expression");
1818 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1819 assert(FC && "insertvalue constant expr couldn't be folded!");
1823 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1824 ArrayRef<unsigned> Idxs) {
1825 assert(Agg->getType()->isFirstClassType() &&
1826 "Tried to create extractelement operation on non-first-class type!");
1828 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1830 assert(ReqTy && "extractvalue indices invalid!");
1832 assert(Agg->getType()->isFirstClassType() &&
1833 "Non-first-class type for constant extractvalue expression");
1834 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1835 assert(FC && "ExtractValue constant expr couldn't be folded!");
1839 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1840 assert(C->getType()->isIntOrIntVectorTy() &&
1841 "Cannot NEG a nonintegral value!");
1842 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1846 Constant *ConstantExpr::getFNeg(Constant *C) {
1847 assert(C->getType()->isFPOrFPVectorTy() &&
1848 "Cannot FNEG a non-floating-point value!");
1849 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1852 Constant *ConstantExpr::getNot(Constant *C) {
1853 assert(C->getType()->isIntOrIntVectorTy() &&
1854 "Cannot NOT a nonintegral value!");
1855 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1858 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1859 bool HasNUW, bool HasNSW) {
1860 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1861 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1862 return get(Instruction::Add, C1, C2, Flags);
1865 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1866 return get(Instruction::FAdd, C1, C2);
1869 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1870 bool HasNUW, bool HasNSW) {
1871 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1872 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1873 return get(Instruction::Sub, C1, C2, Flags);
1876 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1877 return get(Instruction::FSub, C1, C2);
1880 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1881 bool HasNUW, bool HasNSW) {
1882 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1883 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1884 return get(Instruction::Mul, C1, C2, Flags);
1887 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1888 return get(Instruction::FMul, C1, C2);
1891 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1892 return get(Instruction::UDiv, C1, C2,
1893 isExact ? PossiblyExactOperator::IsExact : 0);
1896 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1897 return get(Instruction::SDiv, C1, C2,
1898 isExact ? PossiblyExactOperator::IsExact : 0);
1901 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1902 return get(Instruction::FDiv, C1, C2);
1905 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1906 return get(Instruction::URem, C1, C2);
1909 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1910 return get(Instruction::SRem, C1, C2);
1913 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1914 return get(Instruction::FRem, C1, C2);
1917 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1918 return get(Instruction::And, C1, C2);
1921 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1922 return get(Instruction::Or, C1, C2);
1925 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1926 return get(Instruction::Xor, C1, C2);
1929 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1930 bool HasNUW, bool HasNSW) {
1931 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1932 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1933 return get(Instruction::Shl, C1, C2, Flags);
1936 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1937 return get(Instruction::LShr, C1, C2,
1938 isExact ? PossiblyExactOperator::IsExact : 0);
1941 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1942 return get(Instruction::AShr, C1, C2,
1943 isExact ? PossiblyExactOperator::IsExact : 0);
1946 // destroyConstant - Remove the constant from the constant table...
1948 void ConstantExpr::destroyConstant() {
1949 getType()->getContext().pImpl->ExprConstants.remove(this);
1950 destroyConstantImpl();
1953 const char *ConstantExpr::getOpcodeName() const {
1954 return Instruction::getOpcodeName(getOpcode());
1959 GetElementPtrConstantExpr::
1960 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1962 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1963 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1964 - (IdxList.size()+1), IdxList.size()+1) {
1966 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1967 OperandList[i+1] = IdxList[i];
1970 //===----------------------------------------------------------------------===//
1971 // ConstantData* implementations
1973 void ConstantDataArray::anchor() {}
1974 void ConstantDataVector::anchor() {}
1976 /// getElementType - Return the element type of the array/vector.
1977 Type *ConstantDataSequential::getElementType() const {
1978 return getType()->getElementType();
1981 StringRef ConstantDataSequential::getRawDataValues() const {
1982 return StringRef(DataElements, getNumElements()*getElementByteSize());
1985 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
1986 /// formed with a vector or array of the specified element type.
1987 /// ConstantDataArray only works with normal float and int types that are
1988 /// stored densely in memory, not with things like i42 or x86_f80.
1989 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
1990 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
1991 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
1992 switch (IT->getBitWidth()) {
2004 /// getNumElements - Return the number of elements in the array or vector.
2005 unsigned ConstantDataSequential::getNumElements() const {
2006 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2007 return AT->getNumElements();
2008 return getType()->getVectorNumElements();
2012 /// getElementByteSize - Return the size in bytes of the elements in the data.
2013 uint64_t ConstantDataSequential::getElementByteSize() const {
2014 return getElementType()->getPrimitiveSizeInBits()/8;
2017 /// getElementPointer - Return the start of the specified element.
2018 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2019 assert(Elt < getNumElements() && "Invalid Elt");
2020 return DataElements+Elt*getElementByteSize();
2024 /// isAllZeros - return true if the array is empty or all zeros.
2025 static bool isAllZeros(StringRef Arr) {
2026 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2032 /// getImpl - This is the underlying implementation of all of the
2033 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2034 /// the correct element type. We take the bytes in as an StringRef because
2035 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2036 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2037 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2038 // If the elements are all zero or there are no elements, return a CAZ, which
2039 // is more dense and canonical.
2040 if (isAllZeros(Elements))
2041 return ConstantAggregateZero::get(Ty);
2043 // Do a lookup to see if we have already formed one of these.
2044 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2045 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2047 // The bucket can point to a linked list of different CDS's that have the same
2048 // body but different types. For example, 0,0,0,1 could be a 4 element array
2049 // of i8, or a 1-element array of i32. They'll both end up in the same
2050 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2051 ConstantDataSequential **Entry = &Slot.getValue();
2052 for (ConstantDataSequential *Node = *Entry; Node != 0;
2053 Entry = &Node->Next, Node = *Entry)
2054 if (Node->getType() == Ty)
2057 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2059 if (isa<ArrayType>(Ty))
2060 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2062 assert(isa<VectorType>(Ty));
2063 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2066 void ConstantDataSequential::destroyConstant() {
2067 // Remove the constant from the StringMap.
2068 StringMap<ConstantDataSequential*> &CDSConstants =
2069 getType()->getContext().pImpl->CDSConstants;
2071 StringMap<ConstantDataSequential*>::iterator Slot =
2072 CDSConstants.find(getRawDataValues());
2074 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2076 ConstantDataSequential **Entry = &Slot->getValue();
2078 // Remove the entry from the hash table.
2079 if ((*Entry)->Next == 0) {
2080 // If there is only one value in the bucket (common case) it must be this
2081 // entry, and removing the entry should remove the bucket completely.
2082 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2083 getContext().pImpl->CDSConstants.erase(Slot);
2085 // Otherwise, there are multiple entries linked off the bucket, unlink the
2086 // node we care about but keep the bucket around.
2087 for (ConstantDataSequential *Node = *Entry; ;
2088 Entry = &Node->Next, Node = *Entry) {
2089 assert(Node && "Didn't find entry in its uniquing hash table!");
2090 // If we found our entry, unlink it from the list and we're done.
2092 *Entry = Node->Next;
2098 // If we were part of a list, make sure that we don't delete the list that is
2099 // still owned by the uniquing map.
2102 // Finally, actually delete it.
2103 destroyConstantImpl();
2106 /// get() constructors - Return a constant with array type with an element
2107 /// count and element type matching the ArrayRef passed in. Note that this
2108 /// can return a ConstantAggregateZero object.
2109 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2110 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2111 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2113 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2114 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2115 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2117 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2118 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2119 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2121 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2122 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2123 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2125 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2126 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2127 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2129 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2130 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2131 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2134 /// getString - This method constructs a CDS and initializes it with a text
2135 /// string. The default behavior (AddNull==true) causes a null terminator to
2136 /// be placed at the end of the array (increasing the length of the string by
2137 /// one more than the StringRef would normally indicate. Pass AddNull=false
2138 /// to disable this behavior.
2139 Constant *ConstantDataArray::getString(LLVMContext &Context,
2140 StringRef Str, bool AddNull) {
2142 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2144 SmallVector<uint8_t, 64> ElementVals;
2145 ElementVals.append(Str.begin(), Str.end());
2146 ElementVals.push_back(0);
2147 return get(Context, ElementVals);
2150 /// get() constructors - Return a constant with vector type with an element
2151 /// count and element type matching the ArrayRef passed in. Note that this
2152 /// can return a ConstantAggregateZero object.
2153 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2154 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2155 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2157 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2158 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2159 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2161 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2162 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2163 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2165 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2166 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2167 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2169 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2170 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2171 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2173 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2174 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2175 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2178 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2179 assert(isElementTypeCompatible(V->getType()) &&
2180 "Element type not compatible with ConstantData");
2181 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2182 if (CI->getType()->isIntegerTy(8)) {
2183 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2184 return get(V->getContext(), Elts);
2186 if (CI->getType()->isIntegerTy(16)) {
2187 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2188 return get(V->getContext(), Elts);
2190 if (CI->getType()->isIntegerTy(32)) {
2191 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2192 return get(V->getContext(), Elts);
2194 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2195 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2196 return get(V->getContext(), Elts);
2199 ConstantFP *CFP = cast<ConstantFP>(V);
2200 if (CFP->getType()->isFloatTy()) {
2201 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2202 return get(V->getContext(), Elts);
2204 assert(CFP->getType()->isDoubleTy() && "Unsupported ConstantData type");
2205 SmallVector<double, 16> Elts(NumElts, CFP->getValueAPF().convertToDouble());
2206 return get(V->getContext(), Elts);
2210 /// getElementAsInteger - If this is a sequential container of integers (of
2211 /// any size), return the specified element in the low bits of a uint64_t.
2212 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2213 assert(isa<IntegerType>(getElementType()) &&
2214 "Accessor can only be used when element is an integer");
2215 const char *EltPtr = getElementPointer(Elt);
2217 // The data is stored in host byte order, make sure to cast back to the right
2218 // type to load with the right endianness.
2219 switch (getElementType()->getIntegerBitWidth()) {
2220 default: assert(0 && "Invalid bitwidth for CDS");
2221 case 8: return *(uint8_t*)EltPtr;
2222 case 16: return *(uint16_t*)EltPtr;
2223 case 32: return *(uint32_t*)EltPtr;
2224 case 64: return *(uint64_t*)EltPtr;
2228 /// getElementAsAPFloat - If this is a sequential container of floating point
2229 /// type, return the specified element as an APFloat.
2230 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2231 const char *EltPtr = getElementPointer(Elt);
2233 switch (getElementType()->getTypeID()) {
2235 assert(0 && "Accessor can only be used when element is float/double!");
2236 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2237 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2241 /// getElementAsFloat - If this is an sequential container of floats, return
2242 /// the specified element as a float.
2243 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2244 assert(getElementType()->isFloatTy() &&
2245 "Accessor can only be used when element is a 'float'");
2246 return *(float*)getElementPointer(Elt);
2249 /// getElementAsDouble - If this is an sequential container of doubles, return
2250 /// the specified element as a float.
2251 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2252 assert(getElementType()->isDoubleTy() &&
2253 "Accessor can only be used when element is a 'float'");
2254 return *(double*)getElementPointer(Elt);
2257 /// getElementAsConstant - Return a Constant for a specified index's element.
2258 /// Note that this has to compute a new constant to return, so it isn't as
2259 /// efficient as getElementAsInteger/Float/Double.
2260 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2261 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2262 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2264 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2267 /// isString - This method returns true if this is an array of i8.
2268 bool ConstantDataSequential::isString() const {
2269 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2272 /// isCString - This method returns true if the array "isString", ends with a
2273 /// nul byte, and does not contains any other nul bytes.
2274 bool ConstantDataSequential::isCString() const {
2278 StringRef Str = getAsString();
2280 // The last value must be nul.
2281 if (Str.back() != 0) return false;
2283 // Other elements must be non-nul.
2284 return Str.drop_back().find(0) == StringRef::npos;
2287 /// getSplatValue - If this is a splat constant, meaning that all of the
2288 /// elements have the same value, return that value. Otherwise return NULL.
2289 Constant *ConstantDataVector::getSplatValue() const {
2290 const char *Base = getRawDataValues().data();
2292 // Compare elements 1+ to the 0'th element.
2293 unsigned EltSize = getElementByteSize();
2294 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2295 if (memcmp(Base, Base+i*EltSize, EltSize))
2298 // If they're all the same, return the 0th one as a representative.
2299 return getElementAsConstant(0);
2302 //===----------------------------------------------------------------------===//
2303 // replaceUsesOfWithOnConstant implementations
2305 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2306 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2309 /// Note that we intentionally replace all uses of From with To here. Consider
2310 /// a large array that uses 'From' 1000 times. By handling this case all here,
2311 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2312 /// single invocation handles all 1000 uses. Handling them one at a time would
2313 /// work, but would be really slow because it would have to unique each updated
2316 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2318 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2319 Constant *ToC = cast<Constant>(To);
2321 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2323 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2324 Lookup.first.first = cast<ArrayType>(getType());
2325 Lookup.second = this;
2327 std::vector<Constant*> &Values = Lookup.first.second;
2328 Values.reserve(getNumOperands()); // Build replacement array.
2330 // Fill values with the modified operands of the constant array. Also,
2331 // compute whether this turns into an all-zeros array.
2332 unsigned NumUpdated = 0;
2334 // Keep track of whether all the values in the array are "ToC".
2335 bool AllSame = true;
2336 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2337 Constant *Val = cast<Constant>(O->get());
2342 Values.push_back(Val);
2343 AllSame = Val == ToC;
2346 Constant *Replacement = 0;
2347 if (AllSame && ToC->isNullValue()) {
2348 Replacement = ConstantAggregateZero::get(getType());
2349 } else if (AllSame && isa<UndefValue>(ToC)) {
2350 Replacement = UndefValue::get(getType());
2352 // Check to see if we have this array type already.
2354 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2355 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2358 Replacement = I->second;
2360 // Okay, the new shape doesn't exist in the system yet. Instead of
2361 // creating a new constant array, inserting it, replaceallusesof'ing the
2362 // old with the new, then deleting the old... just update the current one
2364 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2366 // Update to the new value. Optimize for the case when we have a single
2367 // operand that we're changing, but handle bulk updates efficiently.
2368 if (NumUpdated == 1) {
2369 unsigned OperandToUpdate = U - OperandList;
2370 assert(getOperand(OperandToUpdate) == From &&
2371 "ReplaceAllUsesWith broken!");
2372 setOperand(OperandToUpdate, ToC);
2374 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2375 if (getOperand(i) == From)
2382 // Otherwise, I do need to replace this with an existing value.
2383 assert(Replacement != this && "I didn't contain From!");
2385 // Everyone using this now uses the replacement.
2386 replaceAllUsesWith(Replacement);
2388 // Delete the old constant!
2392 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2394 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2395 Constant *ToC = cast<Constant>(To);
2397 unsigned OperandToUpdate = U-OperandList;
2398 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2400 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2401 Lookup.first.first = cast<StructType>(getType());
2402 Lookup.second = this;
2403 std::vector<Constant*> &Values = Lookup.first.second;
2404 Values.reserve(getNumOperands()); // Build replacement struct.
2407 // Fill values with the modified operands of the constant struct. Also,
2408 // compute whether this turns into an all-zeros struct.
2409 bool isAllZeros = false;
2410 bool isAllUndef = false;
2411 if (ToC->isNullValue()) {
2413 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2414 Constant *Val = cast<Constant>(O->get());
2415 Values.push_back(Val);
2416 if (isAllZeros) isAllZeros = Val->isNullValue();
2418 } else if (isa<UndefValue>(ToC)) {
2420 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2421 Constant *Val = cast<Constant>(O->get());
2422 Values.push_back(Val);
2423 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2426 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2427 Values.push_back(cast<Constant>(O->get()));
2429 Values[OperandToUpdate] = ToC;
2431 LLVMContextImpl *pImpl = getContext().pImpl;
2433 Constant *Replacement = 0;
2435 Replacement = ConstantAggregateZero::get(getType());
2436 } else if (isAllUndef) {
2437 Replacement = UndefValue::get(getType());
2439 // Check to see if we have this struct type already.
2441 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2442 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2445 Replacement = I->second;
2447 // Okay, the new shape doesn't exist in the system yet. Instead of
2448 // creating a new constant struct, inserting it, replaceallusesof'ing the
2449 // old with the new, then deleting the old... just update the current one
2451 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2453 // Update to the new value.
2454 setOperand(OperandToUpdate, ToC);
2459 assert(Replacement != this && "I didn't contain From!");
2461 // Everyone using this now uses the replacement.
2462 replaceAllUsesWith(Replacement);
2464 // Delete the old constant!
2468 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2470 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2472 std::vector<Constant*> Values;
2473 Values.reserve(getNumOperands()); // Build replacement array...
2474 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2475 Constant *Val = getOperand(i);
2476 if (Val == From) Val = cast<Constant>(To);
2477 Values.push_back(Val);
2480 Constant *Replacement = get(Values);
2481 assert(Replacement != this && "I didn't contain From!");
2483 // Everyone using this now uses the replacement.
2484 replaceAllUsesWith(Replacement);
2486 // Delete the old constant!
2490 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2492 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2493 Constant *To = cast<Constant>(ToV);
2495 SmallVector<Constant*, 8> NewOps;
2496 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2497 Constant *Op = getOperand(i);
2498 NewOps.push_back(Op == From ? To : Op);
2501 Constant *Replacement = getWithOperands(NewOps);
2502 assert(Replacement != this && "I didn't contain From!");
2504 // Everyone using this now uses the replacement.
2505 replaceAllUsesWith(Replacement);
2507 // Delete the old constant!