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 void Constant::destroyConstantImpl() {
154 // When a Constant is destroyed, there may be lingering
155 // references to the constant by other constants in the constant pool. These
156 // constants are implicitly dependent on the module that is being deleted,
157 // but they don't know that. Because we only find out when the CPV is
158 // deleted, we must now notify all of our users (that should only be
159 // Constants) that they are, in fact, invalid now and should be deleted.
161 while (!use_empty()) {
162 Value *V = use_back();
163 #ifndef NDEBUG // Only in -g mode...
164 if (!isa<Constant>(V)) {
165 dbgs() << "While deleting: " << *this
166 << "\n\nUse still stuck around after Def is destroyed: "
170 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
171 Constant *CV = cast<Constant>(V);
172 CV->destroyConstant();
174 // The constant should remove itself from our use list...
175 assert((use_empty() || use_back() != V) && "Constant not removed!");
178 // Value has no outstanding references it is safe to delete it now...
182 /// canTrap - Return true if evaluation of this constant could trap. This is
183 /// true for things like constant expressions that could divide by zero.
184 bool Constant::canTrap() const {
185 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
186 // The only thing that could possibly trap are constant exprs.
187 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
188 if (!CE) return false;
190 // ConstantExpr traps if any operands can trap.
191 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
192 if (CE->getOperand(i)->canTrap())
195 // Otherwise, only specific operations can trap.
196 switch (CE->getOpcode()) {
199 case Instruction::UDiv:
200 case Instruction::SDiv:
201 case Instruction::FDiv:
202 case Instruction::URem:
203 case Instruction::SRem:
204 case Instruction::FRem:
205 // Div and rem can trap if the RHS is not known to be non-zero.
206 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
212 /// isConstantUsed - Return true if the constant has users other than constant
213 /// exprs and other dangling things.
214 bool Constant::isConstantUsed() const {
215 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
216 const Constant *UC = dyn_cast<Constant>(*UI);
217 if (UC == 0 || isa<GlobalValue>(UC))
220 if (UC->isConstantUsed())
228 /// getRelocationInfo - This method classifies the entry according to
229 /// whether or not it may generate a relocation entry. This must be
230 /// conservative, so if it might codegen to a relocatable entry, it should say
231 /// so. The return values are:
233 /// NoRelocation: This constant pool entry is guaranteed to never have a
234 /// relocation applied to it (because it holds a simple constant like
236 /// LocalRelocation: This entry has relocations, but the entries are
237 /// guaranteed to be resolvable by the static linker, so the dynamic
238 /// linker will never see them.
239 /// GlobalRelocations: This entry may have arbitrary relocations.
241 /// FIXME: This really should not be in VMCore.
242 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
243 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
244 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
245 return LocalRelocation; // Local to this file/library.
246 return GlobalRelocations; // Global reference.
249 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
250 return BA->getFunction()->getRelocationInfo();
252 // While raw uses of blockaddress need to be relocated, differences between
253 // two of them don't when they are for labels in the same function. This is a
254 // common idiom when creating a table for the indirect goto extension, so we
255 // handle it efficiently here.
256 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
257 if (CE->getOpcode() == Instruction::Sub) {
258 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
259 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
261 LHS->getOpcode() == Instruction::PtrToInt &&
262 RHS->getOpcode() == Instruction::PtrToInt &&
263 isa<BlockAddress>(LHS->getOperand(0)) &&
264 isa<BlockAddress>(RHS->getOperand(0)) &&
265 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
266 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
270 PossibleRelocationsTy Result = NoRelocation;
271 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
272 Result = std::max(Result,
273 cast<Constant>(getOperand(i))->getRelocationInfo());
279 /// getVectorElements - This method, which is only valid on constant of vector
280 /// type, returns the elements of the vector in the specified smallvector.
281 /// This handles breaking down a vector undef into undef elements, etc. For
282 /// constant exprs and other cases we can't handle, we return an empty vector.
283 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
284 assert(getType()->isVectorTy() && "Not a vector constant!");
286 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
287 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
288 Elts.push_back(CV->getOperand(i));
292 VectorType *VT = cast<VectorType>(getType());
293 if (isa<ConstantAggregateZero>(this)) {
294 Elts.assign(VT->getNumElements(),
295 Constant::getNullValue(VT->getElementType()));
299 if (isa<UndefValue>(this)) {
300 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
304 // Unknown type, must be constant expr etc.
308 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
309 /// it. This involves recursively eliminating any dead users of the
311 static bool removeDeadUsersOfConstant(const Constant *C) {
312 if (isa<GlobalValue>(C)) return false; // Cannot remove this
314 while (!C->use_empty()) {
315 const Constant *User = dyn_cast<Constant>(C->use_back());
316 if (!User) return false; // Non-constant usage;
317 if (!removeDeadUsersOfConstant(User))
318 return false; // Constant wasn't dead
321 const_cast<Constant*>(C)->destroyConstant();
326 /// removeDeadConstantUsers - If there are any dead constant users dangling
327 /// off of this constant, remove them. This method is useful for clients
328 /// that want to check to see if a global is unused, but don't want to deal
329 /// with potentially dead constants hanging off of the globals.
330 void Constant::removeDeadConstantUsers() const {
331 Value::const_use_iterator I = use_begin(), E = use_end();
332 Value::const_use_iterator LastNonDeadUser = E;
334 const Constant *User = dyn_cast<Constant>(*I);
341 if (!removeDeadUsersOfConstant(User)) {
342 // If the constant wasn't dead, remember that this was the last live use
343 // and move on to the next constant.
349 // If the constant was dead, then the iterator is invalidated.
350 if (LastNonDeadUser == E) {
362 //===----------------------------------------------------------------------===//
364 //===----------------------------------------------------------------------===//
366 void ConstantInt::anchor() { }
368 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
369 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
370 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
373 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
374 LLVMContextImpl *pImpl = Context.pImpl;
375 if (!pImpl->TheTrueVal)
376 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
377 return pImpl->TheTrueVal;
380 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
381 LLVMContextImpl *pImpl = Context.pImpl;
382 if (!pImpl->TheFalseVal)
383 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
384 return pImpl->TheFalseVal;
387 Constant *ConstantInt::getTrue(Type *Ty) {
388 VectorType *VTy = dyn_cast<VectorType>(Ty);
390 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
391 return ConstantInt::getTrue(Ty->getContext());
393 assert(VTy->getElementType()->isIntegerTy(1) &&
394 "True must be vector of i1 or i1.");
395 return ConstantVector::getSplat(VTy->getNumElements(),
396 ConstantInt::getTrue(Ty->getContext()));
399 Constant *ConstantInt::getFalse(Type *Ty) {
400 VectorType *VTy = dyn_cast<VectorType>(Ty);
402 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
403 return ConstantInt::getFalse(Ty->getContext());
405 assert(VTy->getElementType()->isIntegerTy(1) &&
406 "False must be vector of i1 or i1.");
407 return ConstantVector::getSplat(VTy->getNumElements(),
408 ConstantInt::getFalse(Ty->getContext()));
412 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
413 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
414 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
415 // compare APInt's of different widths, which would violate an APInt class
416 // invariant which generates an assertion.
417 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
418 // Get the corresponding integer type for the bit width of the value.
419 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
420 // get an existing value or the insertion position
421 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
422 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
423 if (!Slot) Slot = new ConstantInt(ITy, V);
427 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
428 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
430 // For vectors, broadcast the value.
431 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
432 return ConstantVector::getSplat(VTy->getNumElements(), C);
437 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
439 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
442 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
443 return get(Ty, V, true);
446 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
447 return get(Ty, V, true);
450 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
451 ConstantInt *C = get(Ty->getContext(), V);
452 assert(C->getType() == Ty->getScalarType() &&
453 "ConstantInt type doesn't match the type implied by its value!");
455 // For vectors, broadcast the value.
456 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
457 return ConstantVector::getSplat(VTy->getNumElements(), C);
462 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
464 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
467 //===----------------------------------------------------------------------===//
469 //===----------------------------------------------------------------------===//
471 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
473 return &APFloat::IEEEhalf;
475 return &APFloat::IEEEsingle;
476 if (Ty->isDoubleTy())
477 return &APFloat::IEEEdouble;
478 if (Ty->isX86_FP80Ty())
479 return &APFloat::x87DoubleExtended;
480 else if (Ty->isFP128Ty())
481 return &APFloat::IEEEquad;
483 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
484 return &APFloat::PPCDoubleDouble;
487 void ConstantFP::anchor() { }
489 /// get() - This returns a constant fp for the specified value in the
490 /// specified type. This should only be used for simple constant values like
491 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
492 Constant *ConstantFP::get(Type* Ty, double V) {
493 LLVMContext &Context = Ty->getContext();
497 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
498 APFloat::rmNearestTiesToEven, &ignored);
499 Constant *C = get(Context, FV);
501 // For vectors, broadcast the value.
502 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
503 return ConstantVector::getSplat(VTy->getNumElements(), C);
509 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
510 LLVMContext &Context = Ty->getContext();
512 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
513 Constant *C = get(Context, FV);
515 // For vectors, broadcast the value.
516 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
517 return ConstantVector::getSplat(VTy->getNumElements(), C);
523 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
524 LLVMContext &Context = Ty->getContext();
525 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
527 return get(Context, apf);
531 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
532 Type *ScalarTy = Ty->getScalarType();
533 if (ScalarTy->isFloatingPointTy()) {
534 Constant *C = getNegativeZero(ScalarTy);
535 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
536 return ConstantVector::getSplat(VTy->getNumElements(), C);
540 return Constant::getNullValue(Ty);
544 // ConstantFP accessors.
545 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
546 DenseMapAPFloatKeyInfo::KeyTy Key(V);
548 LLVMContextImpl* pImpl = Context.pImpl;
550 ConstantFP *&Slot = pImpl->FPConstants[Key];
554 if (&V.getSemantics() == &APFloat::IEEEhalf)
555 Ty = Type::getHalfTy(Context);
556 else if (&V.getSemantics() == &APFloat::IEEEsingle)
557 Ty = Type::getFloatTy(Context);
558 else if (&V.getSemantics() == &APFloat::IEEEdouble)
559 Ty = Type::getDoubleTy(Context);
560 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
561 Ty = Type::getX86_FP80Ty(Context);
562 else if (&V.getSemantics() == &APFloat::IEEEquad)
563 Ty = Type::getFP128Ty(Context);
565 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
566 "Unknown FP format");
567 Ty = Type::getPPC_FP128Ty(Context);
569 Slot = new ConstantFP(Ty, V);
575 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
576 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
577 return ConstantFP::get(Ty->getContext(),
578 APFloat::getInf(Semantics, Negative));
581 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
582 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
583 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
587 bool ConstantFP::isExactlyValue(const APFloat &V) const {
588 return Val.bitwiseIsEqual(V);
591 //===----------------------------------------------------------------------===//
592 // ConstantAggregateZero Implementation
593 //===----------------------------------------------------------------------===//
595 /// getSequentialElement - If this CAZ has array or vector type, return a zero
596 /// with the right element type.
597 Constant *ConstantAggregateZero::getSequentialElement() {
598 return Constant::getNullValue(
599 cast<SequentialType>(getType())->getElementType());
602 /// getStructElement - If this CAZ has struct type, return a zero with the
603 /// right element type for the specified element.
604 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) {
605 return Constant::getNullValue(
606 cast<StructType>(getType())->getElementType(Elt));
609 /// getElementValue - Return a zero of the right value for the specified GEP
610 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
611 Constant *ConstantAggregateZero::getElementValue(Constant *C) {
612 if (isa<SequentialType>(getType()))
613 return getSequentialElement();
614 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
617 /// getElementValue - Return a zero of the right value for the specified GEP
619 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) {
620 if (isa<SequentialType>(getType()))
621 return getSequentialElement();
622 return getStructElement(Idx);
626 //===----------------------------------------------------------------------===//
627 // UndefValue Implementation
628 //===----------------------------------------------------------------------===//
630 /// getSequentialElement - If this undef has array or vector type, return an
631 /// undef with the right element type.
632 UndefValue *UndefValue::getSequentialElement() {
633 return UndefValue::get(cast<SequentialType>(getType())->getElementType());
636 /// getStructElement - If this undef has struct type, return a zero with the
637 /// right element type for the specified element.
638 UndefValue *UndefValue::getStructElement(unsigned Elt) {
639 return UndefValue::get(cast<StructType>(getType())->getElementType(Elt));
642 /// getElementValue - Return an undef of the right value for the specified GEP
643 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
644 UndefValue *UndefValue::getElementValue(Constant *C) {
645 if (isa<SequentialType>(getType()))
646 return getSequentialElement();
647 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
650 /// getElementValue - Return an undef of the right value for the specified GEP
652 UndefValue *UndefValue::getElementValue(unsigned Idx) {
653 if (isa<SequentialType>(getType()))
654 return getSequentialElement();
655 return getStructElement(Idx);
660 //===----------------------------------------------------------------------===//
661 // ConstantXXX Classes
662 //===----------------------------------------------------------------------===//
665 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
666 : Constant(T, ConstantArrayVal,
667 OperandTraits<ConstantArray>::op_end(this) - V.size(),
669 assert(V.size() == T->getNumElements() &&
670 "Invalid initializer vector for constant array");
671 for (unsigned i = 0, e = V.size(); i != e; ++i)
672 assert(V[i]->getType() == T->getElementType() &&
673 "Initializer for array element doesn't match array element type!");
674 std::copy(V.begin(), V.end(), op_begin());
677 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
678 for (unsigned i = 0, e = V.size(); i != e; ++i) {
679 assert(V[i]->getType() == Ty->getElementType() &&
680 "Wrong type in array element initializer");
682 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
683 // If this is an all-zero array, return a ConstantAggregateZero object
686 if (!C->isNullValue())
687 return pImpl->ArrayConstants.getOrCreate(Ty, V);
689 for (unsigned i = 1, e = V.size(); i != e; ++i)
691 return pImpl->ArrayConstants.getOrCreate(Ty, V);
694 return ConstantAggregateZero::get(Ty);
697 /// ConstantArray::get(const string&) - Return an array that is initialized to
698 /// contain the specified string. If length is zero then a null terminator is
699 /// added to the specified string so that it may be used in a natural way.
700 /// Otherwise, the length parameter specifies how much of the string to use
701 /// and it won't be null terminated.
703 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
705 std::vector<Constant*> ElementVals;
706 ElementVals.reserve(Str.size() + size_t(AddNull));
707 for (unsigned i = 0; i < Str.size(); ++i)
708 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
710 // Add a null terminator to the string...
712 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
714 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
715 return get(ATy, ElementVals);
718 /// getTypeForElements - Return an anonymous struct type to use for a constant
719 /// with the specified set of elements. The list must not be empty.
720 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
721 ArrayRef<Constant*> V,
723 SmallVector<Type*, 16> EltTypes;
724 for (unsigned i = 0, e = V.size(); i != e; ++i)
725 EltTypes.push_back(V[i]->getType());
727 return StructType::get(Context, EltTypes, Packed);
731 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
734 "ConstantStruct::getTypeForElements cannot be called on empty list");
735 return getTypeForElements(V[0]->getContext(), V, Packed);
739 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
740 : Constant(T, ConstantStructVal,
741 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
743 assert(V.size() == T->getNumElements() &&
744 "Invalid initializer vector for constant structure");
745 for (unsigned i = 0, e = V.size(); i != e; ++i)
746 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
747 "Initializer for struct element doesn't match struct element type!");
748 std::copy(V.begin(), V.end(), op_begin());
751 // ConstantStruct accessors.
752 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
753 // Create a ConstantAggregateZero value if all elements are zeros.
754 for (unsigned i = 0, e = V.size(); i != e; ++i)
755 if (!V[i]->isNullValue())
756 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
758 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
759 "Incorrect # elements specified to ConstantStruct::get");
760 return ConstantAggregateZero::get(ST);
763 Constant *ConstantStruct::get(StructType *T, ...) {
765 SmallVector<Constant*, 8> Values;
767 while (Constant *Val = va_arg(ap, llvm::Constant*))
768 Values.push_back(Val);
770 return get(T, Values);
773 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
774 : Constant(T, ConstantVectorVal,
775 OperandTraits<ConstantVector>::op_end(this) - V.size(),
777 for (size_t i = 0, e = V.size(); i != e; i++)
778 assert(V[i]->getType() == T->getElementType() &&
779 "Initializer for vector element doesn't match vector element type!");
780 std::copy(V.begin(), V.end(), op_begin());
783 // ConstantVector accessors.
784 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
785 assert(!V.empty() && "Vectors can't be empty");
786 VectorType *T = VectorType::get(V.front()->getType(), V.size());
787 LLVMContextImpl *pImpl = T->getContext().pImpl;
789 // If this is an all-undef or all-zero vector, return a
790 // ConstantAggregateZero or UndefValue.
792 bool isZero = C->isNullValue();
793 bool isUndef = isa<UndefValue>(C);
795 if (isZero || isUndef) {
796 for (unsigned i = 1, e = V.size(); i != e; ++i)
798 isZero = isUndef = false;
804 return ConstantAggregateZero::get(T);
806 return UndefValue::get(T);
808 return pImpl->VectorConstants.getOrCreate(T, V);
811 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
812 SmallVector<Constant*, 32> Elts(NumElts, V);
817 // Utility function for determining if a ConstantExpr is a CastOp or not. This
818 // can't be inline because we don't want to #include Instruction.h into
820 bool ConstantExpr::isCast() const {
821 return Instruction::isCast(getOpcode());
824 bool ConstantExpr::isCompare() const {
825 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
828 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
829 if (getOpcode() != Instruction::GetElementPtr) return false;
831 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
832 User::const_op_iterator OI = llvm::next(this->op_begin());
834 // Skip the first index, as it has no static limit.
838 // The remaining indices must be compile-time known integers within the
839 // bounds of the corresponding notional static array types.
840 for (; GEPI != E; ++GEPI, ++OI) {
841 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
842 if (!CI) return false;
843 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
844 if (CI->getValue().getActiveBits() > 64 ||
845 CI->getZExtValue() >= ATy->getNumElements())
849 // All the indices checked out.
853 bool ConstantExpr::hasIndices() const {
854 return getOpcode() == Instruction::ExtractValue ||
855 getOpcode() == Instruction::InsertValue;
858 ArrayRef<unsigned> ConstantExpr::getIndices() const {
859 if (const ExtractValueConstantExpr *EVCE =
860 dyn_cast<ExtractValueConstantExpr>(this))
861 return EVCE->Indices;
863 return cast<InsertValueConstantExpr>(this)->Indices;
866 unsigned ConstantExpr::getPredicate() const {
868 return ((const CompareConstantExpr*)this)->predicate;
871 /// getWithOperandReplaced - Return a constant expression identical to this
872 /// one, but with the specified operand set to the specified value.
874 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
875 assert(OpNo < getNumOperands() && "Operand num is out of range!");
876 assert(Op->getType() == getOperand(OpNo)->getType() &&
877 "Replacing operand with value of different type!");
878 if (getOperand(OpNo) == Op)
879 return const_cast<ConstantExpr*>(this);
881 Constant *Op0, *Op1, *Op2;
882 switch (getOpcode()) {
883 case Instruction::Trunc:
884 case Instruction::ZExt:
885 case Instruction::SExt:
886 case Instruction::FPTrunc:
887 case Instruction::FPExt:
888 case Instruction::UIToFP:
889 case Instruction::SIToFP:
890 case Instruction::FPToUI:
891 case Instruction::FPToSI:
892 case Instruction::PtrToInt:
893 case Instruction::IntToPtr:
894 case Instruction::BitCast:
895 return ConstantExpr::getCast(getOpcode(), Op, getType());
896 case Instruction::Select:
897 Op0 = (OpNo == 0) ? Op : getOperand(0);
898 Op1 = (OpNo == 1) ? Op : getOperand(1);
899 Op2 = (OpNo == 2) ? Op : getOperand(2);
900 return ConstantExpr::getSelect(Op0, Op1, Op2);
901 case Instruction::InsertElement:
902 Op0 = (OpNo == 0) ? Op : getOperand(0);
903 Op1 = (OpNo == 1) ? Op : getOperand(1);
904 Op2 = (OpNo == 2) ? Op : getOperand(2);
905 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
906 case Instruction::ExtractElement:
907 Op0 = (OpNo == 0) ? Op : getOperand(0);
908 Op1 = (OpNo == 1) ? Op : getOperand(1);
909 return ConstantExpr::getExtractElement(Op0, Op1);
910 case Instruction::ShuffleVector:
911 Op0 = (OpNo == 0) ? Op : getOperand(0);
912 Op1 = (OpNo == 1) ? Op : getOperand(1);
913 Op2 = (OpNo == 2) ? Op : getOperand(2);
914 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
915 case Instruction::GetElementPtr: {
916 SmallVector<Constant*, 8> Ops;
917 Ops.resize(getNumOperands()-1);
918 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
919 Ops[i-1] = getOperand(i);
922 ConstantExpr::getGetElementPtr(Op, Ops,
923 cast<GEPOperator>(this)->isInBounds());
926 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
927 cast<GEPOperator>(this)->isInBounds());
930 assert(getNumOperands() == 2 && "Must be binary operator?");
931 Op0 = (OpNo == 0) ? Op : getOperand(0);
932 Op1 = (OpNo == 1) ? Op : getOperand(1);
933 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
937 /// getWithOperands - This returns the current constant expression with the
938 /// operands replaced with the specified values. The specified array must
939 /// have the same number of operands as our current one.
940 Constant *ConstantExpr::
941 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
942 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
943 bool AnyChange = Ty != getType();
944 for (unsigned i = 0; i != Ops.size(); ++i)
945 AnyChange |= Ops[i] != getOperand(i);
947 if (!AnyChange) // No operands changed, return self.
948 return const_cast<ConstantExpr*>(this);
950 switch (getOpcode()) {
951 case Instruction::Trunc:
952 case Instruction::ZExt:
953 case Instruction::SExt:
954 case Instruction::FPTrunc:
955 case Instruction::FPExt:
956 case Instruction::UIToFP:
957 case Instruction::SIToFP:
958 case Instruction::FPToUI:
959 case Instruction::FPToSI:
960 case Instruction::PtrToInt:
961 case Instruction::IntToPtr:
962 case Instruction::BitCast:
963 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
964 case Instruction::Select:
965 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
966 case Instruction::InsertElement:
967 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
968 case Instruction::ExtractElement:
969 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
970 case Instruction::ShuffleVector:
971 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
972 case Instruction::GetElementPtr:
974 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
975 cast<GEPOperator>(this)->isInBounds());
976 case Instruction::ICmp:
977 case Instruction::FCmp:
978 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
980 assert(getNumOperands() == 2 && "Must be binary operator?");
981 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
986 //===----------------------------------------------------------------------===//
987 // isValueValidForType implementations
989 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
990 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
991 if (Ty == Type::getInt1Ty(Ty->getContext()))
992 return Val == 0 || Val == 1;
994 return true; // always true, has to fit in largest type
995 uint64_t Max = (1ll << NumBits) - 1;
999 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1000 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1001 if (Ty == Type::getInt1Ty(Ty->getContext()))
1002 return Val == 0 || Val == 1 || Val == -1;
1004 return true; // always true, has to fit in largest type
1005 int64_t Min = -(1ll << (NumBits-1));
1006 int64_t Max = (1ll << (NumBits-1)) - 1;
1007 return (Val >= Min && Val <= Max);
1010 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1011 // convert modifies in place, so make a copy.
1012 APFloat Val2 = APFloat(Val);
1014 switch (Ty->getTypeID()) {
1016 return false; // These can't be represented as floating point!
1018 // FIXME rounding mode needs to be more flexible
1019 case Type::HalfTyID: {
1020 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1022 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1025 case Type::FloatTyID: {
1026 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1028 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1031 case Type::DoubleTyID: {
1032 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1033 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1034 &Val2.getSemantics() == &APFloat::IEEEdouble)
1036 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1039 case Type::X86_FP80TyID:
1040 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1041 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1042 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1043 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1044 case Type::FP128TyID:
1045 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1046 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1047 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1048 &Val2.getSemantics() == &APFloat::IEEEquad;
1049 case Type::PPC_FP128TyID:
1050 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1051 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1052 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1053 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1058 //===----------------------------------------------------------------------===//
1059 // Factory Function Implementation
1061 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1062 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1063 "Cannot create an aggregate zero of non-aggregate type!");
1065 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1067 Entry = new ConstantAggregateZero(Ty);
1072 /// destroyConstant - Remove the constant from the constant table.
1074 void ConstantAggregateZero::destroyConstant() {
1075 getContext().pImpl->CAZConstants.erase(getType());
1076 destroyConstantImpl();
1079 /// destroyConstant - Remove the constant from the constant table...
1081 void ConstantArray::destroyConstant() {
1082 getType()->getContext().pImpl->ArrayConstants.remove(this);
1083 destroyConstantImpl();
1086 /// isString - This method returns true if the array is an array of i8, and
1087 /// if the elements of the array are all ConstantInt's.
1088 bool ConstantArray::isString() const {
1089 // Check the element type for i8...
1090 if (!getType()->getElementType()->isIntegerTy(8))
1092 // Check the elements to make sure they are all integers, not constant
1094 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1095 if (!isa<ConstantInt>(getOperand(i)))
1100 /// isCString - This method returns true if the array is a string (see
1101 /// isString) and it ends in a null byte \\0 and does not contains any other
1102 /// null bytes except its terminator.
1103 bool ConstantArray::isCString() const {
1104 // Check the element type for i8...
1105 if (!getType()->getElementType()->isIntegerTy(8))
1108 // Last element must be a null.
1109 if (!getOperand(getNumOperands()-1)->isNullValue())
1111 // Other elements must be non-null integers.
1112 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1113 if (!isa<ConstantInt>(getOperand(i)))
1115 if (getOperand(i)->isNullValue())
1122 /// convertToString - Helper function for getAsString() and getAsCString().
1123 static std::string convertToString(const User *U, unsigned len) {
1125 Result.reserve(len);
1126 for (unsigned i = 0; i != len; ++i)
1127 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1131 /// getAsString - If this array is isString(), then this method converts the
1132 /// array to an std::string and returns it. Otherwise, it asserts out.
1134 std::string ConstantArray::getAsString() const {
1135 assert(isString() && "Not a string!");
1136 return convertToString(this, getNumOperands());
1140 /// getAsCString - If this array is isCString(), then this method converts the
1141 /// array (without the trailing null byte) to an std::string and returns it.
1142 /// Otherwise, it asserts out.
1144 std::string ConstantArray::getAsCString() const {
1145 assert(isCString() && "Not a string!");
1146 return convertToString(this, getNumOperands() - 1);
1150 //---- ConstantStruct::get() implementation...
1153 // destroyConstant - Remove the constant from the constant table...
1155 void ConstantStruct::destroyConstant() {
1156 getType()->getContext().pImpl->StructConstants.remove(this);
1157 destroyConstantImpl();
1160 // destroyConstant - Remove the constant from the constant table...
1162 void ConstantVector::destroyConstant() {
1163 getType()->getContext().pImpl->VectorConstants.remove(this);
1164 destroyConstantImpl();
1167 /// getSplatValue - If this is a splat constant, where all of the
1168 /// elements have the same value, return that value. Otherwise return null.
1169 Constant *ConstantVector::getSplatValue() const {
1170 // Check out first element.
1171 Constant *Elt = getOperand(0);
1172 // Then make sure all remaining elements point to the same value.
1173 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1174 if (getOperand(I) != Elt)
1179 //---- ConstantPointerNull::get() implementation.
1182 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1183 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1185 Entry = new ConstantPointerNull(Ty);
1190 // destroyConstant - Remove the constant from the constant table...
1192 void ConstantPointerNull::destroyConstant() {
1193 getContext().pImpl->CPNConstants.erase(getType());
1194 // Free the constant and any dangling references to it.
1195 destroyConstantImpl();
1199 //---- UndefValue::get() implementation.
1202 UndefValue *UndefValue::get(Type *Ty) {
1203 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1205 Entry = new UndefValue(Ty);
1210 // destroyConstant - Remove the constant from the constant table.
1212 void UndefValue::destroyConstant() {
1213 // Free the constant and any dangling references to it.
1214 getContext().pImpl->UVConstants.erase(getType());
1215 destroyConstantImpl();
1218 //---- BlockAddress::get() implementation.
1221 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1222 assert(BB->getParent() != 0 && "Block must have a parent");
1223 return get(BB->getParent(), BB);
1226 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1228 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1230 BA = new BlockAddress(F, BB);
1232 assert(BA->getFunction() == F && "Basic block moved between functions");
1236 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1237 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1241 BB->AdjustBlockAddressRefCount(1);
1245 // destroyConstant - Remove the constant from the constant table.
1247 void BlockAddress::destroyConstant() {
1248 getFunction()->getType()->getContext().pImpl
1249 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1250 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1251 destroyConstantImpl();
1254 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1255 // This could be replacing either the Basic Block or the Function. In either
1256 // case, we have to remove the map entry.
1257 Function *NewF = getFunction();
1258 BasicBlock *NewBB = getBasicBlock();
1261 NewF = cast<Function>(To);
1263 NewBB = cast<BasicBlock>(To);
1265 // See if the 'new' entry already exists, if not, just update this in place
1266 // and return early.
1267 BlockAddress *&NewBA =
1268 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1270 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1272 // Remove the old entry, this can't cause the map to rehash (just a
1273 // tombstone will get added).
1274 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1277 setOperand(0, NewF);
1278 setOperand(1, NewBB);
1279 getBasicBlock()->AdjustBlockAddressRefCount(1);
1283 // Otherwise, I do need to replace this with an existing value.
1284 assert(NewBA != this && "I didn't contain From!");
1286 // Everyone using this now uses the replacement.
1287 replaceAllUsesWith(NewBA);
1292 //---- ConstantExpr::get() implementations.
1295 /// This is a utility function to handle folding of casts and lookup of the
1296 /// cast in the ExprConstants map. It is used by the various get* methods below.
1297 static inline Constant *getFoldedCast(
1298 Instruction::CastOps opc, Constant *C, Type *Ty) {
1299 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1300 // Fold a few common cases
1301 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1304 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1306 // Look up the constant in the table first to ensure uniqueness
1307 std::vector<Constant*> argVec(1, C);
1308 ExprMapKeyType Key(opc, argVec);
1310 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1313 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1314 Instruction::CastOps opc = Instruction::CastOps(oc);
1315 assert(Instruction::isCast(opc) && "opcode out of range");
1316 assert(C && Ty && "Null arguments to getCast");
1317 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1321 llvm_unreachable("Invalid cast opcode");
1322 case Instruction::Trunc: return getTrunc(C, Ty);
1323 case Instruction::ZExt: return getZExt(C, Ty);
1324 case Instruction::SExt: return getSExt(C, Ty);
1325 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1326 case Instruction::FPExt: return getFPExtend(C, Ty);
1327 case Instruction::UIToFP: return getUIToFP(C, Ty);
1328 case Instruction::SIToFP: return getSIToFP(C, Ty);
1329 case Instruction::FPToUI: return getFPToUI(C, Ty);
1330 case Instruction::FPToSI: return getFPToSI(C, Ty);
1331 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1332 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1333 case Instruction::BitCast: return getBitCast(C, Ty);
1337 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1338 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1339 return getBitCast(C, Ty);
1340 return getZExt(C, Ty);
1343 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1344 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1345 return getBitCast(C, Ty);
1346 return getSExt(C, Ty);
1349 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1350 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1351 return getBitCast(C, Ty);
1352 return getTrunc(C, Ty);
1355 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1356 assert(S->getType()->isPointerTy() && "Invalid cast");
1357 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1359 if (Ty->isIntegerTy())
1360 return getPtrToInt(S, Ty);
1361 return getBitCast(S, Ty);
1364 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1366 assert(C->getType()->isIntOrIntVectorTy() &&
1367 Ty->isIntOrIntVectorTy() && "Invalid cast");
1368 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1369 unsigned DstBits = Ty->getScalarSizeInBits();
1370 Instruction::CastOps opcode =
1371 (SrcBits == DstBits ? Instruction::BitCast :
1372 (SrcBits > DstBits ? Instruction::Trunc :
1373 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1374 return getCast(opcode, C, Ty);
1377 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1378 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1380 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1381 unsigned DstBits = Ty->getScalarSizeInBits();
1382 if (SrcBits == DstBits)
1383 return C; // Avoid a useless cast
1384 Instruction::CastOps opcode =
1385 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1386 return getCast(opcode, C, Ty);
1389 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1391 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1392 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1394 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1395 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1396 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1397 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1398 "SrcTy must be larger than DestTy for Trunc!");
1400 return getFoldedCast(Instruction::Trunc, C, Ty);
1403 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1405 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1406 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1408 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1409 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1410 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1411 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1412 "SrcTy must be smaller than DestTy for SExt!");
1414 return getFoldedCast(Instruction::SExt, C, Ty);
1417 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1419 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1420 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1422 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1423 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1424 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1425 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1426 "SrcTy must be smaller than DestTy for ZExt!");
1428 return getFoldedCast(Instruction::ZExt, C, Ty);
1431 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1433 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1434 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1436 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1437 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1438 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1439 "This is an illegal floating point truncation!");
1440 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1443 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1445 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1446 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1448 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1449 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1450 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1451 "This is an illegal floating point extension!");
1452 return getFoldedCast(Instruction::FPExt, C, Ty);
1455 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1457 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1458 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1460 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1461 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1462 "This is an illegal uint to floating point cast!");
1463 return getFoldedCast(Instruction::UIToFP, C, Ty);
1466 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1468 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1469 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1471 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1472 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1473 "This is an illegal sint to floating point cast!");
1474 return getFoldedCast(Instruction::SIToFP, C, Ty);
1477 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1479 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1480 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1482 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1483 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1484 "This is an illegal floating point to uint cast!");
1485 return getFoldedCast(Instruction::FPToUI, C, Ty);
1488 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1490 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1491 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1493 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1494 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1495 "This is an illegal floating point to sint cast!");
1496 return getFoldedCast(Instruction::FPToSI, C, Ty);
1499 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1500 assert(C->getType()->getScalarType()->isPointerTy() &&
1501 "PtrToInt source must be pointer or pointer vector");
1502 assert(DstTy->getScalarType()->isIntegerTy() &&
1503 "PtrToInt destination must be integer or integer vector");
1504 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1505 if (isa<VectorType>(C->getType()))
1506 assert(cast<VectorType>(C->getType())->getNumElements() ==
1507 cast<VectorType>(DstTy)->getNumElements() &&
1508 "Invalid cast between a different number of vector elements");
1509 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1512 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1513 assert(C->getType()->getScalarType()->isIntegerTy() &&
1514 "IntToPtr source must be integer or integer vector");
1515 assert(DstTy->getScalarType()->isPointerTy() &&
1516 "IntToPtr destination must be a pointer or pointer vector");
1517 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1518 if (isa<VectorType>(C->getType()))
1519 assert(cast<VectorType>(C->getType())->getNumElements() ==
1520 cast<VectorType>(DstTy)->getNumElements() &&
1521 "Invalid cast between a different number of vector elements");
1522 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1525 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1526 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1527 "Invalid constantexpr bitcast!");
1529 // It is common to ask for a bitcast of a value to its own type, handle this
1531 if (C->getType() == DstTy) return C;
1533 return getFoldedCast(Instruction::BitCast, C, DstTy);
1536 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1538 // Check the operands for consistency first.
1539 assert(Opcode >= Instruction::BinaryOpsBegin &&
1540 Opcode < Instruction::BinaryOpsEnd &&
1541 "Invalid opcode in binary constant expression");
1542 assert(C1->getType() == C2->getType() &&
1543 "Operand types in binary constant expression should match");
1547 case Instruction::Add:
1548 case Instruction::Sub:
1549 case Instruction::Mul:
1550 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1551 assert(C1->getType()->isIntOrIntVectorTy() &&
1552 "Tried to create an integer operation on a non-integer type!");
1554 case Instruction::FAdd:
1555 case Instruction::FSub:
1556 case Instruction::FMul:
1557 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1558 assert(C1->getType()->isFPOrFPVectorTy() &&
1559 "Tried to create a floating-point operation on a "
1560 "non-floating-point type!");
1562 case Instruction::UDiv:
1563 case Instruction::SDiv:
1564 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1565 assert(C1->getType()->isIntOrIntVectorTy() &&
1566 "Tried to create an arithmetic operation on a non-arithmetic type!");
1568 case Instruction::FDiv:
1569 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1570 assert(C1->getType()->isFPOrFPVectorTy() &&
1571 "Tried to create an arithmetic operation on a non-arithmetic type!");
1573 case Instruction::URem:
1574 case Instruction::SRem:
1575 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1576 assert(C1->getType()->isIntOrIntVectorTy() &&
1577 "Tried to create an arithmetic operation on a non-arithmetic type!");
1579 case Instruction::FRem:
1580 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1581 assert(C1->getType()->isFPOrFPVectorTy() &&
1582 "Tried to create an arithmetic operation on a non-arithmetic type!");
1584 case Instruction::And:
1585 case Instruction::Or:
1586 case Instruction::Xor:
1587 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1588 assert(C1->getType()->isIntOrIntVectorTy() &&
1589 "Tried to create a logical operation on a non-integral type!");
1591 case Instruction::Shl:
1592 case Instruction::LShr:
1593 case Instruction::AShr:
1594 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1595 assert(C1->getType()->isIntOrIntVectorTy() &&
1596 "Tried to create a shift operation on a non-integer type!");
1603 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1604 return FC; // Fold a few common cases.
1606 std::vector<Constant*> argVec(1, C1);
1607 argVec.push_back(C2);
1608 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1610 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1611 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1614 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1615 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1616 // Note that a non-inbounds gep is used, as null isn't within any object.
1617 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1618 Constant *GEP = getGetElementPtr(
1619 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1620 return getPtrToInt(GEP,
1621 Type::getInt64Ty(Ty->getContext()));
1624 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1625 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1626 // Note that a non-inbounds gep is used, as null isn't within any object.
1628 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1629 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1630 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1631 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1632 Constant *Indices[2] = { Zero, One };
1633 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1634 return getPtrToInt(GEP,
1635 Type::getInt64Ty(Ty->getContext()));
1638 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1639 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1643 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1644 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1645 // Note that a non-inbounds gep is used, as null isn't within any object.
1646 Constant *GEPIdx[] = {
1647 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1650 Constant *GEP = getGetElementPtr(
1651 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1652 return getPtrToInt(GEP,
1653 Type::getInt64Ty(Ty->getContext()));
1656 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1657 Constant *C1, Constant *C2) {
1658 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1660 switch (Predicate) {
1661 default: llvm_unreachable("Invalid CmpInst predicate");
1662 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1663 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1664 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1665 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1666 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1667 case CmpInst::FCMP_TRUE:
1668 return getFCmp(Predicate, C1, C2);
1670 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1671 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1672 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1673 case CmpInst::ICMP_SLE:
1674 return getICmp(Predicate, C1, C2);
1678 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1679 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1681 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1682 return SC; // Fold common cases
1684 std::vector<Constant*> argVec(3, C);
1687 ExprMapKeyType Key(Instruction::Select, argVec);
1689 LLVMContextImpl *pImpl = C->getContext().pImpl;
1690 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1693 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1695 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1696 return FC; // Fold a few common cases.
1698 // Get the result type of the getelementptr!
1699 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1700 assert(Ty && "GEP indices invalid!");
1701 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1702 Type *ReqTy = Ty->getPointerTo(AS);
1704 assert(C->getType()->isPointerTy() &&
1705 "Non-pointer type for constant GetElementPtr expression");
1706 // Look up the constant in the table first to ensure uniqueness
1707 std::vector<Constant*> ArgVec;
1708 ArgVec.reserve(1 + Idxs.size());
1709 ArgVec.push_back(C);
1710 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1711 ArgVec.push_back(cast<Constant>(Idxs[i]));
1712 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1713 InBounds ? GEPOperator::IsInBounds : 0);
1715 LLVMContextImpl *pImpl = C->getContext().pImpl;
1716 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1720 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1721 assert(LHS->getType() == RHS->getType());
1722 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1723 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1725 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1726 return FC; // Fold a few common cases...
1728 // Look up the constant in the table first to ensure uniqueness
1729 std::vector<Constant*> ArgVec;
1730 ArgVec.push_back(LHS);
1731 ArgVec.push_back(RHS);
1732 // Get the key type with both the opcode and predicate
1733 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1735 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1736 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1737 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1739 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1740 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1744 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1745 assert(LHS->getType() == RHS->getType());
1746 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1748 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1749 return FC; // Fold a few common cases...
1751 // Look up the constant in the table first to ensure uniqueness
1752 std::vector<Constant*> ArgVec;
1753 ArgVec.push_back(LHS);
1754 ArgVec.push_back(RHS);
1755 // Get the key type with both the opcode and predicate
1756 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1758 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1759 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1760 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1762 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1763 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1766 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1767 assert(Val->getType()->isVectorTy() &&
1768 "Tried to create extractelement operation on non-vector type!");
1769 assert(Idx->getType()->isIntegerTy(32) &&
1770 "Extractelement index must be i32 type!");
1772 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1773 return FC; // Fold a few common cases.
1775 // Look up the constant in the table first to ensure uniqueness
1776 std::vector<Constant*> ArgVec(1, Val);
1777 ArgVec.push_back(Idx);
1778 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1780 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1781 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1782 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1785 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1787 assert(Val->getType()->isVectorTy() &&
1788 "Tried to create insertelement operation on non-vector type!");
1789 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1790 && "Insertelement types must match!");
1791 assert(Idx->getType()->isIntegerTy(32) &&
1792 "Insertelement index must be i32 type!");
1794 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1795 return FC; // Fold a few common cases.
1796 // Look up the constant in the table first to ensure uniqueness
1797 std::vector<Constant*> ArgVec(1, Val);
1798 ArgVec.push_back(Elt);
1799 ArgVec.push_back(Idx);
1800 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1802 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1803 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1806 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1808 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1809 "Invalid shuffle vector constant expr operands!");
1811 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1812 return FC; // Fold a few common cases.
1814 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1815 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1816 Type *ShufTy = VectorType::get(EltTy, NElts);
1818 // Look up the constant in the table first to ensure uniqueness
1819 std::vector<Constant*> ArgVec(1, V1);
1820 ArgVec.push_back(V2);
1821 ArgVec.push_back(Mask);
1822 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1824 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1825 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1828 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1829 ArrayRef<unsigned> Idxs) {
1830 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1831 Idxs) == Val->getType() &&
1832 "insertvalue indices invalid!");
1833 assert(Agg->getType()->isFirstClassType() &&
1834 "Non-first-class type for constant insertvalue expression");
1835 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1836 assert(FC && "insertvalue constant expr couldn't be folded!");
1840 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1841 ArrayRef<unsigned> Idxs) {
1842 assert(Agg->getType()->isFirstClassType() &&
1843 "Tried to create extractelement operation on non-first-class type!");
1845 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1847 assert(ReqTy && "extractvalue indices invalid!");
1849 assert(Agg->getType()->isFirstClassType() &&
1850 "Non-first-class type for constant extractvalue expression");
1851 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1852 assert(FC && "ExtractValue constant expr couldn't be folded!");
1856 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1857 assert(C->getType()->isIntOrIntVectorTy() &&
1858 "Cannot NEG a nonintegral value!");
1859 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1863 Constant *ConstantExpr::getFNeg(Constant *C) {
1864 assert(C->getType()->isFPOrFPVectorTy() &&
1865 "Cannot FNEG a non-floating-point value!");
1866 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1869 Constant *ConstantExpr::getNot(Constant *C) {
1870 assert(C->getType()->isIntOrIntVectorTy() &&
1871 "Cannot NOT a nonintegral value!");
1872 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1875 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1876 bool HasNUW, bool HasNSW) {
1877 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1878 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1879 return get(Instruction::Add, C1, C2, Flags);
1882 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1883 return get(Instruction::FAdd, C1, C2);
1886 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1887 bool HasNUW, bool HasNSW) {
1888 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1889 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1890 return get(Instruction::Sub, C1, C2, Flags);
1893 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1894 return get(Instruction::FSub, C1, C2);
1897 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1898 bool HasNUW, bool HasNSW) {
1899 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1900 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1901 return get(Instruction::Mul, C1, C2, Flags);
1904 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1905 return get(Instruction::FMul, C1, C2);
1908 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1909 return get(Instruction::UDiv, C1, C2,
1910 isExact ? PossiblyExactOperator::IsExact : 0);
1913 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1914 return get(Instruction::SDiv, C1, C2,
1915 isExact ? PossiblyExactOperator::IsExact : 0);
1918 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1919 return get(Instruction::FDiv, C1, C2);
1922 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1923 return get(Instruction::URem, C1, C2);
1926 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1927 return get(Instruction::SRem, C1, C2);
1930 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1931 return get(Instruction::FRem, C1, C2);
1934 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1935 return get(Instruction::And, C1, C2);
1938 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1939 return get(Instruction::Or, C1, C2);
1942 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1943 return get(Instruction::Xor, C1, C2);
1946 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1947 bool HasNUW, bool HasNSW) {
1948 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1949 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1950 return get(Instruction::Shl, C1, C2, Flags);
1953 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1954 return get(Instruction::LShr, C1, C2,
1955 isExact ? PossiblyExactOperator::IsExact : 0);
1958 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1959 return get(Instruction::AShr, C1, C2,
1960 isExact ? PossiblyExactOperator::IsExact : 0);
1963 // destroyConstant - Remove the constant from the constant table...
1965 void ConstantExpr::destroyConstant() {
1966 getType()->getContext().pImpl->ExprConstants.remove(this);
1967 destroyConstantImpl();
1970 const char *ConstantExpr::getOpcodeName() const {
1971 return Instruction::getOpcodeName(getOpcode());
1976 GetElementPtrConstantExpr::
1977 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1979 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1980 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1981 - (IdxList.size()+1), IdxList.size()+1) {
1983 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1984 OperandList[i+1] = IdxList[i];
1987 //===----------------------------------------------------------------------===//
1988 // ConstantData* implementations
1990 void ConstantDataArray::anchor() {}
1991 void ConstantDataVector::anchor() {}
1993 /// getElementType - Return the element type of the array/vector.
1994 Type *ConstantDataSequential::getElementType() const {
1995 return getType()->getElementType();
1998 StringRef ConstantDataSequential::getRawDataValues() const {
1999 return StringRef(DataElements, getNumElements()*getElementByteSize());
2002 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2003 /// formed with a vector or array of the specified element type.
2004 /// ConstantDataArray only works with normal float and int types that are
2005 /// stored densely in memory, not with things like i42 or x86_f80.
2006 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2007 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2008 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2009 switch (IT->getBitWidth()) {
2021 /// getNumElements - Return the number of elements in the array or vector.
2022 unsigned ConstantDataSequential::getNumElements() const {
2023 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2024 return AT->getNumElements();
2025 return cast<VectorType>(getType())->getNumElements();
2029 /// getElementByteSize - Return the size in bytes of the elements in the data.
2030 uint64_t ConstantDataSequential::getElementByteSize() const {
2031 return getElementType()->getPrimitiveSizeInBits()/8;
2034 /// getElementPointer - Return the start of the specified element.
2035 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2036 assert(Elt < getNumElements() && "Invalid Elt");
2037 return DataElements+Elt*getElementByteSize();
2041 /// isAllZeros - return true if the array is empty or all zeros.
2042 static bool isAllZeros(StringRef Arr) {
2043 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2049 /// getImpl - This is the underlying implementation of all of the
2050 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2051 /// the correct element type. We take the bytes in as an StringRef because
2052 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2053 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2054 assert(isElementTypeCompatible(cast<SequentialType>(Ty)->getElementType()));
2055 // If the elements are all zero or there are no elements, return a CAZ, which
2056 // is more dense and canonical.
2057 if (isAllZeros(Elements))
2058 return ConstantAggregateZero::get(Ty);
2060 // Do a lookup to see if we have already formed one of these.
2061 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2062 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2064 // The bucket can point to a linked list of different CDS's that have the same
2065 // body but different types. For example, 0,0,0,1 could be a 4 element array
2066 // of i8, or a 1-element array of i32. They'll both end up in the same
2067 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2068 ConstantDataSequential **Entry = &Slot.getValue();
2069 for (ConstantDataSequential *Node = *Entry; Node != 0;
2070 Entry = &Node->Next, Node = *Entry)
2071 if (Node->getType() == Ty)
2074 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2076 if (isa<ArrayType>(Ty))
2077 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2079 assert(isa<VectorType>(Ty));
2080 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2083 void ConstantDataSequential::destroyConstant() {
2084 // Remove the constant from the StringMap.
2085 StringMap<ConstantDataSequential*> &CDSConstants =
2086 getType()->getContext().pImpl->CDSConstants;
2088 StringMap<ConstantDataSequential*>::iterator Slot =
2089 CDSConstants.find(getRawDataValues());
2091 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2093 ConstantDataSequential **Entry = &Slot->getValue();
2095 // Remove the entry from the hash table.
2096 if ((*Entry)->Next == 0) {
2097 // If there is only one value in the bucket (common case) it must be this
2098 // entry, and removing the entry should remove the bucket completely.
2099 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2100 getContext().pImpl->CDSConstants.erase(Slot);
2102 // Otherwise, there are multiple entries linked off the bucket, unlink the
2103 // node we care about but keep the bucket around.
2104 for (ConstantDataSequential *Node = *Entry; ;
2105 Entry = &Node->Next, Node = *Entry) {
2106 assert(Node && "Didn't find entry in its uniquing hash table!");
2107 // If we found our entry, unlink it from the list and we're done.
2109 *Entry = Node->Next;
2115 // If we were part of a list, make sure that we don't delete the list that is
2116 // still owned by the uniquing map.
2119 // Finally, actually delete it.
2120 destroyConstantImpl();
2123 /// get() constructors - Return a constant with array type with an element
2124 /// count and element type matching the ArrayRef passed in. Note that this
2125 /// can return a ConstantAggregateZero object.
2126 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2127 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2128 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2130 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2131 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2132 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2134 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2135 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2136 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2138 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2139 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2140 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2142 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2143 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2144 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2146 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2147 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2148 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2151 /// getString - This method constructs a CDS and initializes it with a text
2152 /// string. The default behavior (AddNull==true) causes a null terminator to
2153 /// be placed at the end of the array (increasing the length of the string by
2154 /// one more than the StringRef would normally indicate. Pass AddNull=false
2155 /// to disable this behavior.
2156 Constant *ConstantDataArray::getString(LLVMContext &Context,
2157 StringRef Str, bool AddNull) {
2159 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2161 SmallVector<uint8_t, 64> ElementVals;
2162 ElementVals.append(Str.begin(), Str.end());
2163 ElementVals.push_back(0);
2164 return get(Context, ElementVals);
2167 /// get() constructors - Return a constant with vector type with an element
2168 /// count and element type matching the ArrayRef passed in. Note that this
2169 /// can return a ConstantAggregateZero object.
2170 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2171 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2172 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2174 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2175 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2176 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2178 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2179 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2180 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2182 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2183 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2184 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2186 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2187 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2188 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2190 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2191 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2192 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2195 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2196 assert(isElementTypeCompatible(V->getType()) &&
2197 "Element type not compatible with ConstantData");
2198 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2199 if (CI->getType()->isIntegerTy(8)) {
2200 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2201 return get(V->getContext(), Elts);
2203 if (CI->getType()->isIntegerTy(16)) {
2204 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2205 return get(V->getContext(), Elts);
2207 if (CI->getType()->isIntegerTy(32)) {
2208 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2209 return get(V->getContext(), Elts);
2211 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2212 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2213 return get(V->getContext(), Elts);
2216 ConstantFP *CFP = cast<ConstantFP>(V);
2217 if (CFP->getType()->isFloatTy()) {
2218 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2219 return get(V->getContext(), Elts);
2221 assert(CFP->getType()->isDoubleTy() && "Unsupported ConstantData type");
2222 SmallVector<double, 16> Elts(NumElts, CFP->getValueAPF().convertToDouble());
2223 return get(V->getContext(), Elts);
2227 /// getElementAsInteger - If this is a sequential container of integers (of
2228 /// any size), return the specified element in the low bits of a uint64_t.
2229 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2230 assert(isa<IntegerType>(getElementType()) &&
2231 "Accessor can only be used when element is an integer");
2232 const char *EltPtr = getElementPointer(Elt);
2234 // The data is stored in host byte order, make sure to cast back to the right
2235 // type to load with the right endianness.
2236 switch (cast<IntegerType>(getElementType())->getBitWidth()) {
2237 default: assert(0 && "Invalid bitwidth for CDS");
2238 case 8: return *(uint8_t*)EltPtr;
2239 case 16: return *(uint16_t*)EltPtr;
2240 case 32: return *(uint32_t*)EltPtr;
2241 case 64: return *(uint64_t*)EltPtr;
2245 /// getElementAsAPFloat - If this is a sequential container of floating point
2246 /// type, return the specified element as an APFloat.
2247 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2248 const char *EltPtr = getElementPointer(Elt);
2250 switch (getElementType()->getTypeID()) {
2252 assert(0 && "Accessor can only be used when element is float/double!");
2253 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2254 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2258 /// getElementAsFloat - If this is an sequential container of floats, return
2259 /// the specified element as a float.
2260 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2261 assert(getElementType()->isFloatTy() &&
2262 "Accessor can only be used when element is a 'float'");
2263 return *(float*)getElementPointer(Elt);
2266 /// getElementAsDouble - If this is an sequential container of doubles, return
2267 /// the specified element as a float.
2268 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2269 assert(getElementType()->isDoubleTy() &&
2270 "Accessor can only be used when element is a 'float'");
2271 return *(double*)getElementPointer(Elt);
2274 /// getElementAsConstant - Return a Constant for a specified index's element.
2275 /// Note that this has to compute a new constant to return, so it isn't as
2276 /// efficient as getElementAsInteger/Float/Double.
2277 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2278 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2279 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2281 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2284 /// isString - This method returns true if this is an array of i8.
2285 bool ConstantDataSequential::isString() const {
2286 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2289 /// isCString - This method returns true if the array "isString", ends with a
2290 /// nul byte, and does not contains any other nul bytes.
2291 bool ConstantDataSequential::isCString() const {
2295 StringRef Str = getAsString();
2297 // The last value must be nul.
2298 if (Str.back() != 0) return false;
2300 // Other elements must be non-nul.
2301 return Str.drop_back().find(0) == StringRef::npos;
2305 //===----------------------------------------------------------------------===//
2306 // replaceUsesOfWithOnConstant implementations
2308 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2309 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2312 /// Note that we intentionally replace all uses of From with To here. Consider
2313 /// a large array that uses 'From' 1000 times. By handling this case all here,
2314 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2315 /// single invocation handles all 1000 uses. Handling them one at a time would
2316 /// work, but would be really slow because it would have to unique each updated
2319 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2321 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2322 Constant *ToC = cast<Constant>(To);
2324 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2326 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2327 Lookup.first.first = cast<ArrayType>(getType());
2328 Lookup.second = this;
2330 std::vector<Constant*> &Values = Lookup.first.second;
2331 Values.reserve(getNumOperands()); // Build replacement array.
2333 // Fill values with the modified operands of the constant array. Also,
2334 // compute whether this turns into an all-zeros array.
2335 bool isAllZeros = false;
2336 unsigned NumUpdated = 0;
2337 if (!ToC->isNullValue()) {
2338 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2339 Constant *Val = cast<Constant>(O->get());
2344 Values.push_back(Val);
2348 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2349 Constant *Val = cast<Constant>(O->get());
2354 Values.push_back(Val);
2355 if (isAllZeros) isAllZeros = Val->isNullValue();
2359 Constant *Replacement = 0;
2361 Replacement = ConstantAggregateZero::get(getType());
2363 // Check to see if we have this array type already.
2365 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2366 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2369 Replacement = I->second;
2371 // Okay, the new shape doesn't exist in the system yet. Instead of
2372 // creating a new constant array, inserting it, replaceallusesof'ing the
2373 // old with the new, then deleting the old... just update the current one
2375 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2377 // Update to the new value. Optimize for the case when we have a single
2378 // operand that we're changing, but handle bulk updates efficiently.
2379 if (NumUpdated == 1) {
2380 unsigned OperandToUpdate = U - OperandList;
2381 assert(getOperand(OperandToUpdate) == From &&
2382 "ReplaceAllUsesWith broken!");
2383 setOperand(OperandToUpdate, ToC);
2385 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2386 if (getOperand(i) == From)
2393 // Otherwise, I do need to replace this with an existing value.
2394 assert(Replacement != this && "I didn't contain From!");
2396 // Everyone using this now uses the replacement.
2397 replaceAllUsesWith(Replacement);
2399 // Delete the old constant!
2403 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2405 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2406 Constant *ToC = cast<Constant>(To);
2408 unsigned OperandToUpdate = U-OperandList;
2409 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2411 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2412 Lookup.first.first = cast<StructType>(getType());
2413 Lookup.second = this;
2414 std::vector<Constant*> &Values = Lookup.first.second;
2415 Values.reserve(getNumOperands()); // Build replacement struct.
2418 // Fill values with the modified operands of the constant struct. Also,
2419 // compute whether this turns into an all-zeros struct.
2420 bool isAllZeros = false;
2421 if (!ToC->isNullValue()) {
2422 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2423 Values.push_back(cast<Constant>(O->get()));
2426 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2427 Constant *Val = cast<Constant>(O->get());
2428 Values.push_back(Val);
2429 if (isAllZeros) isAllZeros = Val->isNullValue();
2432 Values[OperandToUpdate] = ToC;
2434 LLVMContextImpl *pImpl = getContext().pImpl;
2436 Constant *Replacement = 0;
2438 Replacement = ConstantAggregateZero::get(getType());
2440 // Check to see if we have this struct type already.
2442 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2443 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2446 Replacement = I->second;
2448 // Okay, the new shape doesn't exist in the system yet. Instead of
2449 // creating a new constant struct, inserting it, replaceallusesof'ing the
2450 // old with the new, then deleting the old... just update the current one
2452 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2454 // Update to the new value.
2455 setOperand(OperandToUpdate, ToC);
2460 assert(Replacement != this && "I didn't contain From!");
2462 // Everyone using this now uses the replacement.
2463 replaceAllUsesWith(Replacement);
2465 // Delete the old constant!
2469 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2471 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2473 std::vector<Constant*> Values;
2474 Values.reserve(getNumOperands()); // Build replacement array...
2475 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2476 Constant *Val = getOperand(i);
2477 if (Val == From) Val = cast<Constant>(To);
2478 Values.push_back(Val);
2481 Constant *Replacement = get(Values);
2482 assert(Replacement != this && "I didn't contain From!");
2484 // Everyone using this now uses the replacement.
2485 replaceAllUsesWith(Replacement);
2487 // Delete the old constant!
2491 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2493 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2494 Constant *To = cast<Constant>(ToV);
2496 Constant *Replacement = 0;
2497 if (getOpcode() == Instruction::GetElementPtr) {
2498 SmallVector<Constant*, 8> Indices;
2499 Constant *Pointer = getOperand(0);
2500 Indices.reserve(getNumOperands()-1);
2501 if (Pointer == From) Pointer = To;
2503 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2504 Constant *Val = getOperand(i);
2505 if (Val == From) Val = To;
2506 Indices.push_back(Val);
2508 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2509 cast<GEPOperator>(this)->isInBounds());
2510 } else if (getOpcode() == Instruction::ExtractValue) {
2511 Constant *Agg = getOperand(0);
2512 if (Agg == From) Agg = To;
2514 ArrayRef<unsigned> Indices = getIndices();
2515 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2516 } else if (getOpcode() == Instruction::InsertValue) {
2517 Constant *Agg = getOperand(0);
2518 Constant *Val = getOperand(1);
2519 if (Agg == From) Agg = To;
2520 if (Val == From) Val = To;
2522 ArrayRef<unsigned> Indices = getIndices();
2523 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2524 } else if (isCast()) {
2525 assert(getOperand(0) == From && "Cast only has one use!");
2526 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2527 } else if (getOpcode() == Instruction::Select) {
2528 Constant *C1 = getOperand(0);
2529 Constant *C2 = getOperand(1);
2530 Constant *C3 = getOperand(2);
2531 if (C1 == From) C1 = To;
2532 if (C2 == From) C2 = To;
2533 if (C3 == From) C3 = To;
2534 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2535 } else if (getOpcode() == Instruction::ExtractElement) {
2536 Constant *C1 = getOperand(0);
2537 Constant *C2 = getOperand(1);
2538 if (C1 == From) C1 = To;
2539 if (C2 == From) C2 = To;
2540 Replacement = ConstantExpr::getExtractElement(C1, C2);
2541 } else if (getOpcode() == Instruction::InsertElement) {
2542 Constant *C1 = getOperand(0);
2543 Constant *C2 = getOperand(1);
2544 Constant *C3 = getOperand(1);
2545 if (C1 == From) C1 = To;
2546 if (C2 == From) C2 = To;
2547 if (C3 == From) C3 = To;
2548 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2549 } else if (getOpcode() == Instruction::ShuffleVector) {
2550 Constant *C1 = getOperand(0);
2551 Constant *C2 = getOperand(1);
2552 Constant *C3 = getOperand(2);
2553 if (C1 == From) C1 = To;
2554 if (C2 == From) C2 = To;
2555 if (C3 == From) C3 = To;
2556 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2557 } else if (isCompare()) {
2558 Constant *C1 = getOperand(0);
2559 Constant *C2 = getOperand(1);
2560 if (C1 == From) C1 = To;
2561 if (C2 == From) C2 = To;
2562 if (getOpcode() == Instruction::ICmp)
2563 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2565 assert(getOpcode() == Instruction::FCmp);
2566 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2568 } else if (getNumOperands() == 2) {
2569 Constant *C1 = getOperand(0);
2570 Constant *C2 = getOperand(1);
2571 if (C1 == From) C1 = To;
2572 if (C2 == From) C2 = To;
2573 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2575 llvm_unreachable("Unknown ConstantExpr type!");
2578 assert(Replacement != this && "I didn't contain From!");
2580 // Everyone using this now uses the replacement.
2581 replaceAllUsesWith(Replacement);
2583 // Delete the old constant!