1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "LLVMContextImpl.h"
16 #include "ConstantFold.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/GlobalValue.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/Operator.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/ADT/DenseMap.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/STLExtras.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Otherwise, just use +0.0.
54 bool Constant::isNullValue() const {
56 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
60 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
61 return CFP->isZero() && !CFP->isNegative();
63 // constant zero is zero for aggregates and cpnull is null for pointers.
64 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
67 bool Constant::isAllOnesValue() const {
68 // Check for -1 integers
69 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
70 return CI->isMinusOne();
72 // Check for FP which are bitcasted from -1 integers
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
74 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
76 // Check for constant vectors which are splats of -1 values.
77 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
78 if (Constant *Splat = CV->getSplatValue())
79 return Splat->isAllOnesValue();
84 // Constructor to create a '0' constant of arbitrary type...
85 Constant *Constant::getNullValue(Type *Ty) {
86 switch (Ty->getTypeID()) {
87 case Type::IntegerTyID:
88 return ConstantInt::get(Ty, 0);
90 return ConstantFP::get(Ty->getContext(),
91 APFloat::getZero(APFloat::IEEEhalf));
93 return ConstantFP::get(Ty->getContext(),
94 APFloat::getZero(APFloat::IEEEsingle));
95 case Type::DoubleTyID:
96 return ConstantFP::get(Ty->getContext(),
97 APFloat::getZero(APFloat::IEEEdouble));
98 case Type::X86_FP80TyID:
99 return ConstantFP::get(Ty->getContext(),
100 APFloat::getZero(APFloat::x87DoubleExtended));
101 case Type::FP128TyID:
102 return ConstantFP::get(Ty->getContext(),
103 APFloat::getZero(APFloat::IEEEquad));
104 case Type::PPC_FP128TyID:
105 return ConstantFP::get(Ty->getContext(),
106 APFloat(APInt::getNullValue(128)));
107 case Type::PointerTyID:
108 return ConstantPointerNull::get(cast<PointerType>(Ty));
109 case Type::StructTyID:
110 case Type::ArrayTyID:
111 case Type::VectorTyID:
112 return ConstantAggregateZero::get(Ty);
114 // Function, Label, or Opaque type?
115 assert(0 && "Cannot create a null constant of that type!");
120 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
121 Type *ScalarTy = Ty->getScalarType();
123 // Create the base integer constant.
124 Constant *C = ConstantInt::get(Ty->getContext(), V);
126 // Convert an integer to a pointer, if necessary.
127 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
128 C = ConstantExpr::getIntToPtr(C, PTy);
130 // Broadcast a scalar to a vector, if necessary.
131 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
132 C = ConstantVector::getSplat(VTy->getNumElements(), C);
137 Constant *Constant::getAllOnesValue(Type *Ty) {
138 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
139 return ConstantInt::get(Ty->getContext(),
140 APInt::getAllOnesValue(ITy->getBitWidth()));
142 if (Ty->isFloatingPointTy()) {
143 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
144 !Ty->isPPC_FP128Ty());
145 return ConstantFP::get(Ty->getContext(), FL);
148 VectorType *VTy = cast<VectorType>(Ty);
149 return ConstantVector::getSplat(VTy->getNumElements(),
150 getAllOnesValue(VTy->getElementType()));
153 /// getAggregateElement - For aggregates (struct/array/vector) return the
154 /// constant that corresponds to the specified element if possible, or null if
155 /// not. This can return null if the element index is a ConstantExpr, or if
156 /// 'this' is a constant expr.
157 Constant *Constant::getAggregateElement(unsigned Elt) const {
158 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
159 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
161 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
162 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
164 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
165 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
167 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
168 return CAZ->getElementValue(Elt);
170 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
171 return UV->getElementValue(Elt);
173 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(this))
174 return CDS->getElementAsConstant(Elt);
178 Constant *Constant::getAggregateElement(Constant *Elt) const {
179 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
180 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
181 return getAggregateElement(CI->getZExtValue());
186 void Constant::destroyConstantImpl() {
187 // When a Constant is destroyed, there may be lingering
188 // references to the constant by other constants in the constant pool. These
189 // constants are implicitly dependent on the module that is being deleted,
190 // but they don't know that. Because we only find out when the CPV is
191 // deleted, we must now notify all of our users (that should only be
192 // Constants) that they are, in fact, invalid now and should be deleted.
194 while (!use_empty()) {
195 Value *V = use_back();
196 #ifndef NDEBUG // Only in -g mode...
197 if (!isa<Constant>(V)) {
198 dbgs() << "While deleting: " << *this
199 << "\n\nUse still stuck around after Def is destroyed: "
203 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
204 Constant *CV = cast<Constant>(V);
205 CV->destroyConstant();
207 // The constant should remove itself from our use list...
208 assert((use_empty() || use_back() != V) && "Constant not removed!");
211 // Value has no outstanding references it is safe to delete it now...
215 /// canTrap - Return true if evaluation of this constant could trap. This is
216 /// true for things like constant expressions that could divide by zero.
217 bool Constant::canTrap() const {
218 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
219 // The only thing that could possibly trap are constant exprs.
220 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
221 if (!CE) return false;
223 // ConstantExpr traps if any operands can trap.
224 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
225 if (CE->getOperand(i)->canTrap())
228 // Otherwise, only specific operations can trap.
229 switch (CE->getOpcode()) {
232 case Instruction::UDiv:
233 case Instruction::SDiv:
234 case Instruction::FDiv:
235 case Instruction::URem:
236 case Instruction::SRem:
237 case Instruction::FRem:
238 // Div and rem can trap if the RHS is not known to be non-zero.
239 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
245 /// isConstantUsed - Return true if the constant has users other than constant
246 /// exprs and other dangling things.
247 bool Constant::isConstantUsed() const {
248 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
249 const Constant *UC = dyn_cast<Constant>(*UI);
250 if (UC == 0 || isa<GlobalValue>(UC))
253 if (UC->isConstantUsed())
261 /// getRelocationInfo - This method classifies the entry according to
262 /// whether or not it may generate a relocation entry. This must be
263 /// conservative, so if it might codegen to a relocatable entry, it should say
264 /// so. The return values are:
266 /// NoRelocation: This constant pool entry is guaranteed to never have a
267 /// relocation applied to it (because it holds a simple constant like
269 /// LocalRelocation: This entry has relocations, but the entries are
270 /// guaranteed to be resolvable by the static linker, so the dynamic
271 /// linker will never see them.
272 /// GlobalRelocations: This entry may have arbitrary relocations.
274 /// FIXME: This really should not be in VMCore.
275 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
276 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
277 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
278 return LocalRelocation; // Local to this file/library.
279 return GlobalRelocations; // Global reference.
282 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
283 return BA->getFunction()->getRelocationInfo();
285 // While raw uses of blockaddress need to be relocated, differences between
286 // two of them don't when they are for labels in the same function. This is a
287 // common idiom when creating a table for the indirect goto extension, so we
288 // handle it efficiently here.
289 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
290 if (CE->getOpcode() == Instruction::Sub) {
291 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
292 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
294 LHS->getOpcode() == Instruction::PtrToInt &&
295 RHS->getOpcode() == Instruction::PtrToInt &&
296 isa<BlockAddress>(LHS->getOperand(0)) &&
297 isa<BlockAddress>(RHS->getOperand(0)) &&
298 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
299 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
303 PossibleRelocationsTy Result = NoRelocation;
304 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
305 Result = std::max(Result,
306 cast<Constant>(getOperand(i))->getRelocationInfo());
312 /// getVectorElements - This method, which is only valid on constant of vector
313 /// type, returns the elements of the vector in the specified smallvector.
314 /// This handles breaking down a vector undef into undef elements, etc. For
315 /// constant exprs and other cases we can't handle, we return an empty vector.
316 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
317 assert(getType()->isVectorTy() && "Not a vector constant!");
319 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
320 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
321 Elts.push_back(CV->getOperand(i));
325 VectorType *VT = cast<VectorType>(getType());
326 if (isa<ConstantAggregateZero>(this)) {
327 Elts.assign(VT->getNumElements(),
328 Constant::getNullValue(VT->getElementType()));
332 if (isa<UndefValue>(this)) {
333 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
337 // Unknown type, must be constant expr etc.
341 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
342 /// it. This involves recursively eliminating any dead users of the
344 static bool removeDeadUsersOfConstant(const Constant *C) {
345 if (isa<GlobalValue>(C)) return false; // Cannot remove this
347 while (!C->use_empty()) {
348 const Constant *User = dyn_cast<Constant>(C->use_back());
349 if (!User) return false; // Non-constant usage;
350 if (!removeDeadUsersOfConstant(User))
351 return false; // Constant wasn't dead
354 const_cast<Constant*>(C)->destroyConstant();
359 /// removeDeadConstantUsers - If there are any dead constant users dangling
360 /// off of this constant, remove them. This method is useful for clients
361 /// that want to check to see if a global is unused, but don't want to deal
362 /// with potentially dead constants hanging off of the globals.
363 void Constant::removeDeadConstantUsers() const {
364 Value::const_use_iterator I = use_begin(), E = use_end();
365 Value::const_use_iterator LastNonDeadUser = E;
367 const Constant *User = dyn_cast<Constant>(*I);
374 if (!removeDeadUsersOfConstant(User)) {
375 // If the constant wasn't dead, remember that this was the last live use
376 // and move on to the next constant.
382 // If the constant was dead, then the iterator is invalidated.
383 if (LastNonDeadUser == E) {
395 //===----------------------------------------------------------------------===//
397 //===----------------------------------------------------------------------===//
399 void ConstantInt::anchor() { }
401 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
402 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
403 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
406 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
407 LLVMContextImpl *pImpl = Context.pImpl;
408 if (!pImpl->TheTrueVal)
409 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
410 return pImpl->TheTrueVal;
413 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
414 LLVMContextImpl *pImpl = Context.pImpl;
415 if (!pImpl->TheFalseVal)
416 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
417 return pImpl->TheFalseVal;
420 Constant *ConstantInt::getTrue(Type *Ty) {
421 VectorType *VTy = dyn_cast<VectorType>(Ty);
423 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
424 return ConstantInt::getTrue(Ty->getContext());
426 assert(VTy->getElementType()->isIntegerTy(1) &&
427 "True must be vector of i1 or i1.");
428 return ConstantVector::getSplat(VTy->getNumElements(),
429 ConstantInt::getTrue(Ty->getContext()));
432 Constant *ConstantInt::getFalse(Type *Ty) {
433 VectorType *VTy = dyn_cast<VectorType>(Ty);
435 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
436 return ConstantInt::getFalse(Ty->getContext());
438 assert(VTy->getElementType()->isIntegerTy(1) &&
439 "False must be vector of i1 or i1.");
440 return ConstantVector::getSplat(VTy->getNumElements(),
441 ConstantInt::getFalse(Ty->getContext()));
445 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
446 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
447 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
448 // compare APInt's of different widths, which would violate an APInt class
449 // invariant which generates an assertion.
450 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
451 // Get the corresponding integer type for the bit width of the value.
452 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
453 // get an existing value or the insertion position
454 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
455 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
456 if (!Slot) Slot = new ConstantInt(ITy, V);
460 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
461 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
463 // For vectors, broadcast the value.
464 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
465 return ConstantVector::getSplat(VTy->getNumElements(), C);
470 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
472 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
475 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
476 return get(Ty, V, true);
479 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
480 return get(Ty, V, true);
483 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
484 ConstantInt *C = get(Ty->getContext(), V);
485 assert(C->getType() == Ty->getScalarType() &&
486 "ConstantInt type doesn't match the type implied by its value!");
488 // For vectors, broadcast the value.
489 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
490 return ConstantVector::getSplat(VTy->getNumElements(), C);
495 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
497 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
500 //===----------------------------------------------------------------------===//
502 //===----------------------------------------------------------------------===//
504 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
506 return &APFloat::IEEEhalf;
508 return &APFloat::IEEEsingle;
509 if (Ty->isDoubleTy())
510 return &APFloat::IEEEdouble;
511 if (Ty->isX86_FP80Ty())
512 return &APFloat::x87DoubleExtended;
513 else if (Ty->isFP128Ty())
514 return &APFloat::IEEEquad;
516 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
517 return &APFloat::PPCDoubleDouble;
520 void ConstantFP::anchor() { }
522 /// get() - This returns a constant fp for the specified value in the
523 /// specified type. This should only be used for simple constant values like
524 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
525 Constant *ConstantFP::get(Type* Ty, double V) {
526 LLVMContext &Context = Ty->getContext();
530 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
531 APFloat::rmNearestTiesToEven, &ignored);
532 Constant *C = get(Context, FV);
534 // For vectors, broadcast the value.
535 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
536 return ConstantVector::getSplat(VTy->getNumElements(), C);
542 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
543 LLVMContext &Context = Ty->getContext();
545 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
546 Constant *C = get(Context, FV);
548 // For vectors, broadcast the value.
549 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
550 return ConstantVector::getSplat(VTy->getNumElements(), C);
556 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
557 LLVMContext &Context = Ty->getContext();
558 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
560 return get(Context, apf);
564 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
565 Type *ScalarTy = Ty->getScalarType();
566 if (ScalarTy->isFloatingPointTy()) {
567 Constant *C = getNegativeZero(ScalarTy);
568 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
569 return ConstantVector::getSplat(VTy->getNumElements(), C);
573 return Constant::getNullValue(Ty);
577 // ConstantFP accessors.
578 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
579 DenseMapAPFloatKeyInfo::KeyTy Key(V);
581 LLVMContextImpl* pImpl = Context.pImpl;
583 ConstantFP *&Slot = pImpl->FPConstants[Key];
587 if (&V.getSemantics() == &APFloat::IEEEhalf)
588 Ty = Type::getHalfTy(Context);
589 else if (&V.getSemantics() == &APFloat::IEEEsingle)
590 Ty = Type::getFloatTy(Context);
591 else if (&V.getSemantics() == &APFloat::IEEEdouble)
592 Ty = Type::getDoubleTy(Context);
593 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
594 Ty = Type::getX86_FP80Ty(Context);
595 else if (&V.getSemantics() == &APFloat::IEEEquad)
596 Ty = Type::getFP128Ty(Context);
598 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
599 "Unknown FP format");
600 Ty = Type::getPPC_FP128Ty(Context);
602 Slot = new ConstantFP(Ty, V);
608 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
609 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
610 return ConstantFP::get(Ty->getContext(),
611 APFloat::getInf(Semantics, Negative));
614 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
615 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
616 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
620 bool ConstantFP::isExactlyValue(const APFloat &V) const {
621 return Val.bitwiseIsEqual(V);
624 //===----------------------------------------------------------------------===//
625 // ConstantAggregateZero Implementation
626 //===----------------------------------------------------------------------===//
628 /// getSequentialElement - If this CAZ has array or vector type, return a zero
629 /// with the right element type.
630 Constant *ConstantAggregateZero::getSequentialElement() const {
631 return Constant::getNullValue(
632 cast<SequentialType>(getType())->getElementType());
635 /// getStructElement - If this CAZ has struct type, return a zero with the
636 /// right element type for the specified element.
637 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
638 return Constant::getNullValue(
639 cast<StructType>(getType())->getElementType(Elt));
642 /// getElementValue - Return a zero of the right value for the specified GEP
643 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
644 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
645 if (isa<SequentialType>(getType()))
646 return getSequentialElement();
647 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
650 /// getElementValue - Return a zero of the right value for the specified GEP
652 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
653 if (isa<SequentialType>(getType()))
654 return getSequentialElement();
655 return getStructElement(Idx);
659 //===----------------------------------------------------------------------===//
660 // UndefValue Implementation
661 //===----------------------------------------------------------------------===//
663 /// getSequentialElement - If this undef has array or vector type, return an
664 /// undef with the right element type.
665 UndefValue *UndefValue::getSequentialElement() const {
666 return UndefValue::get(cast<SequentialType>(getType())->getElementType());
669 /// getStructElement - If this undef has struct type, return a zero with the
670 /// right element type for the specified element.
671 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
672 return UndefValue::get(cast<StructType>(getType())->getElementType(Elt));
675 /// getElementValue - Return an undef of the right value for the specified GEP
676 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
677 UndefValue *UndefValue::getElementValue(Constant *C) const {
678 if (isa<SequentialType>(getType()))
679 return getSequentialElement();
680 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
683 /// getElementValue - Return an undef of the right value for the specified GEP
685 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
686 if (isa<SequentialType>(getType()))
687 return getSequentialElement();
688 return getStructElement(Idx);
693 //===----------------------------------------------------------------------===//
694 // ConstantXXX Classes
695 //===----------------------------------------------------------------------===//
698 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
699 : Constant(T, ConstantArrayVal,
700 OperandTraits<ConstantArray>::op_end(this) - V.size(),
702 assert(V.size() == T->getNumElements() &&
703 "Invalid initializer vector for constant array");
704 for (unsigned i = 0, e = V.size(); i != e; ++i)
705 assert(V[i]->getType() == T->getElementType() &&
706 "Initializer for array element doesn't match array element type!");
707 std::copy(V.begin(), V.end(), op_begin());
710 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
711 for (unsigned i = 0, e = V.size(); i != e; ++i) {
712 assert(V[i]->getType() == Ty->getElementType() &&
713 "Wrong type in array element initializer");
715 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
716 // If this is an all-zero array, return a ConstantAggregateZero object
719 if (!C->isNullValue())
720 return pImpl->ArrayConstants.getOrCreate(Ty, V);
722 for (unsigned i = 1, e = V.size(); i != e; ++i)
724 return pImpl->ArrayConstants.getOrCreate(Ty, V);
727 return ConstantAggregateZero::get(Ty);
730 /// ConstantArray::get(const string&) - Return an array that is initialized to
731 /// contain the specified string. If length is zero then a null terminator is
732 /// added to the specified string so that it may be used in a natural way.
733 /// Otherwise, the length parameter specifies how much of the string to use
734 /// and it won't be null terminated.
736 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
738 std::vector<Constant*> ElementVals;
739 ElementVals.reserve(Str.size() + size_t(AddNull));
740 for (unsigned i = 0; i < Str.size(); ++i)
741 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
743 // Add a null terminator to the string...
745 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
747 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
748 return get(ATy, ElementVals);
751 /// getTypeForElements - Return an anonymous struct type to use for a constant
752 /// with the specified set of elements. The list must not be empty.
753 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
754 ArrayRef<Constant*> V,
756 SmallVector<Type*, 16> EltTypes;
757 for (unsigned i = 0, e = V.size(); i != e; ++i)
758 EltTypes.push_back(V[i]->getType());
760 return StructType::get(Context, EltTypes, Packed);
764 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
767 "ConstantStruct::getTypeForElements cannot be called on empty list");
768 return getTypeForElements(V[0]->getContext(), V, Packed);
772 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
773 : Constant(T, ConstantStructVal,
774 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
776 assert(V.size() == T->getNumElements() &&
777 "Invalid initializer vector for constant structure");
778 for (unsigned i = 0, e = V.size(); i != e; ++i)
779 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
780 "Initializer for struct element doesn't match struct element type!");
781 std::copy(V.begin(), V.end(), op_begin());
784 // ConstantStruct accessors.
785 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
786 // Create a ConstantAggregateZero value if all elements are zeros.
787 for (unsigned i = 0, e = V.size(); i != e; ++i)
788 if (!V[i]->isNullValue())
789 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
791 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
792 "Incorrect # elements specified to ConstantStruct::get");
793 return ConstantAggregateZero::get(ST);
796 Constant *ConstantStruct::get(StructType *T, ...) {
798 SmallVector<Constant*, 8> Values;
800 while (Constant *Val = va_arg(ap, llvm::Constant*))
801 Values.push_back(Val);
803 return get(T, Values);
806 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
807 : Constant(T, ConstantVectorVal,
808 OperandTraits<ConstantVector>::op_end(this) - V.size(),
810 for (size_t i = 0, e = V.size(); i != e; i++)
811 assert(V[i]->getType() == T->getElementType() &&
812 "Initializer for vector element doesn't match vector element type!");
813 std::copy(V.begin(), V.end(), op_begin());
816 // ConstantVector accessors.
817 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
818 assert(!V.empty() && "Vectors can't be empty");
819 VectorType *T = VectorType::get(V.front()->getType(), V.size());
820 LLVMContextImpl *pImpl = T->getContext().pImpl;
822 // If this is an all-undef or all-zero vector, return a
823 // ConstantAggregateZero or UndefValue.
825 bool isZero = C->isNullValue();
826 bool isUndef = isa<UndefValue>(C);
828 if (isZero || isUndef) {
829 for (unsigned i = 1, e = V.size(); i != e; ++i)
831 isZero = isUndef = false;
837 return ConstantAggregateZero::get(T);
839 return UndefValue::get(T);
841 return pImpl->VectorConstants.getOrCreate(T, V);
844 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
845 SmallVector<Constant*, 32> Elts(NumElts, V);
850 // Utility function for determining if a ConstantExpr is a CastOp or not. This
851 // can't be inline because we don't want to #include Instruction.h into
853 bool ConstantExpr::isCast() const {
854 return Instruction::isCast(getOpcode());
857 bool ConstantExpr::isCompare() const {
858 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
861 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
862 if (getOpcode() != Instruction::GetElementPtr) return false;
864 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
865 User::const_op_iterator OI = llvm::next(this->op_begin());
867 // Skip the first index, as it has no static limit.
871 // The remaining indices must be compile-time known integers within the
872 // bounds of the corresponding notional static array types.
873 for (; GEPI != E; ++GEPI, ++OI) {
874 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
875 if (!CI) return false;
876 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
877 if (CI->getValue().getActiveBits() > 64 ||
878 CI->getZExtValue() >= ATy->getNumElements())
882 // All the indices checked out.
886 bool ConstantExpr::hasIndices() const {
887 return getOpcode() == Instruction::ExtractValue ||
888 getOpcode() == Instruction::InsertValue;
891 ArrayRef<unsigned> ConstantExpr::getIndices() const {
892 if (const ExtractValueConstantExpr *EVCE =
893 dyn_cast<ExtractValueConstantExpr>(this))
894 return EVCE->Indices;
896 return cast<InsertValueConstantExpr>(this)->Indices;
899 unsigned ConstantExpr::getPredicate() const {
901 return ((const CompareConstantExpr*)this)->predicate;
904 /// getWithOperandReplaced - Return a constant expression identical to this
905 /// one, but with the specified operand set to the specified value.
907 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
908 assert(OpNo < getNumOperands() && "Operand num is out of range!");
909 assert(Op->getType() == getOperand(OpNo)->getType() &&
910 "Replacing operand with value of different type!");
911 if (getOperand(OpNo) == Op)
912 return const_cast<ConstantExpr*>(this);
914 Constant *Op0, *Op1, *Op2;
915 switch (getOpcode()) {
916 case Instruction::Trunc:
917 case Instruction::ZExt:
918 case Instruction::SExt:
919 case Instruction::FPTrunc:
920 case Instruction::FPExt:
921 case Instruction::UIToFP:
922 case Instruction::SIToFP:
923 case Instruction::FPToUI:
924 case Instruction::FPToSI:
925 case Instruction::PtrToInt:
926 case Instruction::IntToPtr:
927 case Instruction::BitCast:
928 return ConstantExpr::getCast(getOpcode(), Op, getType());
929 case Instruction::Select:
930 Op0 = (OpNo == 0) ? Op : getOperand(0);
931 Op1 = (OpNo == 1) ? Op : getOperand(1);
932 Op2 = (OpNo == 2) ? Op : getOperand(2);
933 return ConstantExpr::getSelect(Op0, Op1, Op2);
934 case Instruction::InsertElement:
935 Op0 = (OpNo == 0) ? Op : getOperand(0);
936 Op1 = (OpNo == 1) ? Op : getOperand(1);
937 Op2 = (OpNo == 2) ? Op : getOperand(2);
938 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
939 case Instruction::ExtractElement:
940 Op0 = (OpNo == 0) ? Op : getOperand(0);
941 Op1 = (OpNo == 1) ? Op : getOperand(1);
942 return ConstantExpr::getExtractElement(Op0, Op1);
943 case Instruction::ShuffleVector:
944 Op0 = (OpNo == 0) ? Op : getOperand(0);
945 Op1 = (OpNo == 1) ? Op : getOperand(1);
946 Op2 = (OpNo == 2) ? Op : getOperand(2);
947 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
948 case Instruction::GetElementPtr: {
949 SmallVector<Constant*, 8> Ops;
950 Ops.resize(getNumOperands()-1);
951 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
952 Ops[i-1] = getOperand(i);
955 ConstantExpr::getGetElementPtr(Op, Ops,
956 cast<GEPOperator>(this)->isInBounds());
959 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
960 cast<GEPOperator>(this)->isInBounds());
963 assert(getNumOperands() == 2 && "Must be binary operator?");
964 Op0 = (OpNo == 0) ? Op : getOperand(0);
965 Op1 = (OpNo == 1) ? Op : getOperand(1);
966 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
970 /// getWithOperands - This returns the current constant expression with the
971 /// operands replaced with the specified values. The specified array must
972 /// have the same number of operands as our current one.
973 Constant *ConstantExpr::
974 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
975 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
976 bool AnyChange = Ty != getType();
977 for (unsigned i = 0; i != Ops.size(); ++i)
978 AnyChange |= Ops[i] != getOperand(i);
980 if (!AnyChange) // No operands changed, return self.
981 return const_cast<ConstantExpr*>(this);
983 switch (getOpcode()) {
984 case Instruction::Trunc:
985 case Instruction::ZExt:
986 case Instruction::SExt:
987 case Instruction::FPTrunc:
988 case Instruction::FPExt:
989 case Instruction::UIToFP:
990 case Instruction::SIToFP:
991 case Instruction::FPToUI:
992 case Instruction::FPToSI:
993 case Instruction::PtrToInt:
994 case Instruction::IntToPtr:
995 case Instruction::BitCast:
996 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
997 case Instruction::Select:
998 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
999 case Instruction::InsertElement:
1000 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1001 case Instruction::ExtractElement:
1002 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1003 case Instruction::ShuffleVector:
1004 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1005 case Instruction::GetElementPtr:
1007 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1008 cast<GEPOperator>(this)->isInBounds());
1009 case Instruction::ICmp:
1010 case Instruction::FCmp:
1011 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1013 assert(getNumOperands() == 2 && "Must be binary operator?");
1014 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1019 //===----------------------------------------------------------------------===//
1020 // isValueValidForType implementations
1022 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1023 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1024 if (Ty == Type::getInt1Ty(Ty->getContext()))
1025 return Val == 0 || Val == 1;
1027 return true; // always true, has to fit in largest type
1028 uint64_t Max = (1ll << NumBits) - 1;
1032 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1033 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1034 if (Ty == Type::getInt1Ty(Ty->getContext()))
1035 return Val == 0 || Val == 1 || Val == -1;
1037 return true; // always true, has to fit in largest type
1038 int64_t Min = -(1ll << (NumBits-1));
1039 int64_t Max = (1ll << (NumBits-1)) - 1;
1040 return (Val >= Min && Val <= Max);
1043 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1044 // convert modifies in place, so make a copy.
1045 APFloat Val2 = APFloat(Val);
1047 switch (Ty->getTypeID()) {
1049 return false; // These can't be represented as floating point!
1051 // FIXME rounding mode needs to be more flexible
1052 case Type::HalfTyID: {
1053 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1055 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1058 case Type::FloatTyID: {
1059 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1061 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1064 case Type::DoubleTyID: {
1065 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1066 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1067 &Val2.getSemantics() == &APFloat::IEEEdouble)
1069 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1072 case Type::X86_FP80TyID:
1073 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1074 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1075 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1076 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1077 case Type::FP128TyID:
1078 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1079 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1080 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1081 &Val2.getSemantics() == &APFloat::IEEEquad;
1082 case Type::PPC_FP128TyID:
1083 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1084 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1085 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1086 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1091 //===----------------------------------------------------------------------===//
1092 // Factory Function Implementation
1094 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1095 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1096 "Cannot create an aggregate zero of non-aggregate type!");
1098 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1100 Entry = new ConstantAggregateZero(Ty);
1105 /// destroyConstant - Remove the constant from the constant table.
1107 void ConstantAggregateZero::destroyConstant() {
1108 getContext().pImpl->CAZConstants.erase(getType());
1109 destroyConstantImpl();
1112 /// destroyConstant - Remove the constant from the constant table...
1114 void ConstantArray::destroyConstant() {
1115 getType()->getContext().pImpl->ArrayConstants.remove(this);
1116 destroyConstantImpl();
1119 /// isString - This method returns true if the array is an array of i8, and
1120 /// if the elements of the array are all ConstantInt's.
1121 bool ConstantArray::isString() const {
1122 // Check the element type for i8...
1123 if (!getType()->getElementType()->isIntegerTy(8))
1125 // Check the elements to make sure they are all integers, not constant
1127 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1128 if (!isa<ConstantInt>(getOperand(i)))
1133 /// isCString - This method returns true if the array is a string (see
1134 /// isString) and it ends in a null byte \\0 and does not contains any other
1135 /// null bytes except its terminator.
1136 bool ConstantArray::isCString() const {
1137 // Check the element type for i8...
1138 if (!getType()->getElementType()->isIntegerTy(8))
1141 // Last element must be a null.
1142 if (!getOperand(getNumOperands()-1)->isNullValue())
1144 // Other elements must be non-null integers.
1145 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1146 if (!isa<ConstantInt>(getOperand(i)))
1148 if (getOperand(i)->isNullValue())
1155 /// convertToString - Helper function for getAsString() and getAsCString().
1156 static std::string convertToString(const User *U, unsigned len) {
1158 Result.reserve(len);
1159 for (unsigned i = 0; i != len; ++i)
1160 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1164 /// getAsString - If this array is isString(), then this method converts the
1165 /// array to an std::string and returns it. Otherwise, it asserts out.
1167 std::string ConstantArray::getAsString() const {
1168 assert(isString() && "Not a string!");
1169 return convertToString(this, getNumOperands());
1173 /// getAsCString - If this array is isCString(), then this method converts the
1174 /// array (without the trailing null byte) to an std::string and returns it.
1175 /// Otherwise, it asserts out.
1177 std::string ConstantArray::getAsCString() const {
1178 assert(isCString() && "Not a string!");
1179 return convertToString(this, getNumOperands() - 1);
1183 //---- ConstantStruct::get() implementation...
1186 // destroyConstant - Remove the constant from the constant table...
1188 void ConstantStruct::destroyConstant() {
1189 getType()->getContext().pImpl->StructConstants.remove(this);
1190 destroyConstantImpl();
1193 // destroyConstant - Remove the constant from the constant table...
1195 void ConstantVector::destroyConstant() {
1196 getType()->getContext().pImpl->VectorConstants.remove(this);
1197 destroyConstantImpl();
1200 /// getSplatValue - If this is a splat constant, where all of the
1201 /// elements have the same value, return that value. Otherwise return null.
1202 Constant *ConstantVector::getSplatValue() const {
1203 // Check out first element.
1204 Constant *Elt = getOperand(0);
1205 // Then make sure all remaining elements point to the same value.
1206 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1207 if (getOperand(I) != Elt)
1212 //---- ConstantPointerNull::get() implementation.
1215 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1216 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1218 Entry = new ConstantPointerNull(Ty);
1223 // destroyConstant - Remove the constant from the constant table...
1225 void ConstantPointerNull::destroyConstant() {
1226 getContext().pImpl->CPNConstants.erase(getType());
1227 // Free the constant and any dangling references to it.
1228 destroyConstantImpl();
1232 //---- UndefValue::get() implementation.
1235 UndefValue *UndefValue::get(Type *Ty) {
1236 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1238 Entry = new UndefValue(Ty);
1243 // destroyConstant - Remove the constant from the constant table.
1245 void UndefValue::destroyConstant() {
1246 // Free the constant and any dangling references to it.
1247 getContext().pImpl->UVConstants.erase(getType());
1248 destroyConstantImpl();
1251 //---- BlockAddress::get() implementation.
1254 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1255 assert(BB->getParent() != 0 && "Block must have a parent");
1256 return get(BB->getParent(), BB);
1259 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1261 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1263 BA = new BlockAddress(F, BB);
1265 assert(BA->getFunction() == F && "Basic block moved between functions");
1269 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1270 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1274 BB->AdjustBlockAddressRefCount(1);
1278 // destroyConstant - Remove the constant from the constant table.
1280 void BlockAddress::destroyConstant() {
1281 getFunction()->getType()->getContext().pImpl
1282 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1283 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1284 destroyConstantImpl();
1287 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1288 // This could be replacing either the Basic Block or the Function. In either
1289 // case, we have to remove the map entry.
1290 Function *NewF = getFunction();
1291 BasicBlock *NewBB = getBasicBlock();
1294 NewF = cast<Function>(To);
1296 NewBB = cast<BasicBlock>(To);
1298 // See if the 'new' entry already exists, if not, just update this in place
1299 // and return early.
1300 BlockAddress *&NewBA =
1301 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1303 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1305 // Remove the old entry, this can't cause the map to rehash (just a
1306 // tombstone will get added).
1307 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1310 setOperand(0, NewF);
1311 setOperand(1, NewBB);
1312 getBasicBlock()->AdjustBlockAddressRefCount(1);
1316 // Otherwise, I do need to replace this with an existing value.
1317 assert(NewBA != this && "I didn't contain From!");
1319 // Everyone using this now uses the replacement.
1320 replaceAllUsesWith(NewBA);
1325 //---- ConstantExpr::get() implementations.
1328 /// This is a utility function to handle folding of casts and lookup of the
1329 /// cast in the ExprConstants map. It is used by the various get* methods below.
1330 static inline Constant *getFoldedCast(
1331 Instruction::CastOps opc, Constant *C, Type *Ty) {
1332 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1333 // Fold a few common cases
1334 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1337 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1339 // Look up the constant in the table first to ensure uniqueness
1340 std::vector<Constant*> argVec(1, C);
1341 ExprMapKeyType Key(opc, argVec);
1343 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1346 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1347 Instruction::CastOps opc = Instruction::CastOps(oc);
1348 assert(Instruction::isCast(opc) && "opcode out of range");
1349 assert(C && Ty && "Null arguments to getCast");
1350 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1354 llvm_unreachable("Invalid cast opcode");
1355 case Instruction::Trunc: return getTrunc(C, Ty);
1356 case Instruction::ZExt: return getZExt(C, Ty);
1357 case Instruction::SExt: return getSExt(C, Ty);
1358 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1359 case Instruction::FPExt: return getFPExtend(C, Ty);
1360 case Instruction::UIToFP: return getUIToFP(C, Ty);
1361 case Instruction::SIToFP: return getSIToFP(C, Ty);
1362 case Instruction::FPToUI: return getFPToUI(C, Ty);
1363 case Instruction::FPToSI: return getFPToSI(C, Ty);
1364 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1365 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1366 case Instruction::BitCast: return getBitCast(C, Ty);
1370 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1371 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1372 return getBitCast(C, Ty);
1373 return getZExt(C, Ty);
1376 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1377 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1378 return getBitCast(C, Ty);
1379 return getSExt(C, Ty);
1382 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1383 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1384 return getBitCast(C, Ty);
1385 return getTrunc(C, Ty);
1388 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1389 assert(S->getType()->isPointerTy() && "Invalid cast");
1390 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1392 if (Ty->isIntegerTy())
1393 return getPtrToInt(S, Ty);
1394 return getBitCast(S, Ty);
1397 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1399 assert(C->getType()->isIntOrIntVectorTy() &&
1400 Ty->isIntOrIntVectorTy() && "Invalid cast");
1401 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1402 unsigned DstBits = Ty->getScalarSizeInBits();
1403 Instruction::CastOps opcode =
1404 (SrcBits == DstBits ? Instruction::BitCast :
1405 (SrcBits > DstBits ? Instruction::Trunc :
1406 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1407 return getCast(opcode, C, Ty);
1410 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1411 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1413 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1414 unsigned DstBits = Ty->getScalarSizeInBits();
1415 if (SrcBits == DstBits)
1416 return C; // Avoid a useless cast
1417 Instruction::CastOps opcode =
1418 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1419 return getCast(opcode, C, Ty);
1422 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1424 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1425 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1427 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1428 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1429 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1430 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1431 "SrcTy must be larger than DestTy for Trunc!");
1433 return getFoldedCast(Instruction::Trunc, C, Ty);
1436 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1438 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1439 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1441 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1442 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1443 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1444 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1445 "SrcTy must be smaller than DestTy for SExt!");
1447 return getFoldedCast(Instruction::SExt, C, Ty);
1450 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1452 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1453 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1455 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1456 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1457 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1458 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1459 "SrcTy must be smaller than DestTy for ZExt!");
1461 return getFoldedCast(Instruction::ZExt, C, Ty);
1464 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1466 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1467 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1469 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1470 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1471 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1472 "This is an illegal floating point truncation!");
1473 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1476 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1478 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1479 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1481 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1482 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1483 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1484 "This is an illegal floating point extension!");
1485 return getFoldedCast(Instruction::FPExt, C, Ty);
1488 Constant *ConstantExpr::getUIToFP(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()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1495 "This is an illegal uint to floating point cast!");
1496 return getFoldedCast(Instruction::UIToFP, C, Ty);
1499 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1501 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1502 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1504 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1505 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1506 "This is an illegal sint to floating point cast!");
1507 return getFoldedCast(Instruction::SIToFP, C, Ty);
1510 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1512 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1513 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1515 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1516 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1517 "This is an illegal floating point to uint cast!");
1518 return getFoldedCast(Instruction::FPToUI, C, Ty);
1521 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1523 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1524 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1526 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1527 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1528 "This is an illegal floating point to sint cast!");
1529 return getFoldedCast(Instruction::FPToSI, C, Ty);
1532 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1533 assert(C->getType()->getScalarType()->isPointerTy() &&
1534 "PtrToInt source must be pointer or pointer vector");
1535 assert(DstTy->getScalarType()->isIntegerTy() &&
1536 "PtrToInt destination must be integer or integer vector");
1537 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1538 if (isa<VectorType>(C->getType()))
1539 assert(cast<VectorType>(C->getType())->getNumElements() ==
1540 cast<VectorType>(DstTy)->getNumElements() &&
1541 "Invalid cast between a different number of vector elements");
1542 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1545 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1546 assert(C->getType()->getScalarType()->isIntegerTy() &&
1547 "IntToPtr source must be integer or integer vector");
1548 assert(DstTy->getScalarType()->isPointerTy() &&
1549 "IntToPtr destination must be a pointer or pointer vector");
1550 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1551 if (isa<VectorType>(C->getType()))
1552 assert(cast<VectorType>(C->getType())->getNumElements() ==
1553 cast<VectorType>(DstTy)->getNumElements() &&
1554 "Invalid cast between a different number of vector elements");
1555 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1558 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1559 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1560 "Invalid constantexpr bitcast!");
1562 // It is common to ask for a bitcast of a value to its own type, handle this
1564 if (C->getType() == DstTy) return C;
1566 return getFoldedCast(Instruction::BitCast, C, DstTy);
1569 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1571 // Check the operands for consistency first.
1572 assert(Opcode >= Instruction::BinaryOpsBegin &&
1573 Opcode < Instruction::BinaryOpsEnd &&
1574 "Invalid opcode in binary constant expression");
1575 assert(C1->getType() == C2->getType() &&
1576 "Operand types in binary constant expression should match");
1580 case Instruction::Add:
1581 case Instruction::Sub:
1582 case Instruction::Mul:
1583 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1584 assert(C1->getType()->isIntOrIntVectorTy() &&
1585 "Tried to create an integer operation on a non-integer type!");
1587 case Instruction::FAdd:
1588 case Instruction::FSub:
1589 case Instruction::FMul:
1590 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1591 assert(C1->getType()->isFPOrFPVectorTy() &&
1592 "Tried to create a floating-point operation on a "
1593 "non-floating-point type!");
1595 case Instruction::UDiv:
1596 case Instruction::SDiv:
1597 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1598 assert(C1->getType()->isIntOrIntVectorTy() &&
1599 "Tried to create an arithmetic operation on a non-arithmetic type!");
1601 case Instruction::FDiv:
1602 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1603 assert(C1->getType()->isFPOrFPVectorTy() &&
1604 "Tried to create an arithmetic operation on a non-arithmetic type!");
1606 case Instruction::URem:
1607 case Instruction::SRem:
1608 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1609 assert(C1->getType()->isIntOrIntVectorTy() &&
1610 "Tried to create an arithmetic operation on a non-arithmetic type!");
1612 case Instruction::FRem:
1613 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1614 assert(C1->getType()->isFPOrFPVectorTy() &&
1615 "Tried to create an arithmetic operation on a non-arithmetic type!");
1617 case Instruction::And:
1618 case Instruction::Or:
1619 case Instruction::Xor:
1620 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1621 assert(C1->getType()->isIntOrIntVectorTy() &&
1622 "Tried to create a logical operation on a non-integral type!");
1624 case Instruction::Shl:
1625 case Instruction::LShr:
1626 case Instruction::AShr:
1627 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1628 assert(C1->getType()->isIntOrIntVectorTy() &&
1629 "Tried to create a shift operation on a non-integer type!");
1636 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1637 return FC; // Fold a few common cases.
1639 std::vector<Constant*> argVec(1, C1);
1640 argVec.push_back(C2);
1641 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1643 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1644 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1647 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1648 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1649 // Note that a non-inbounds gep is used, as null isn't within any object.
1650 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1651 Constant *GEP = getGetElementPtr(
1652 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1653 return getPtrToInt(GEP,
1654 Type::getInt64Ty(Ty->getContext()));
1657 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1658 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1659 // Note that a non-inbounds gep is used, as null isn't within any object.
1661 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1662 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1663 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1664 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1665 Constant *Indices[2] = { Zero, One };
1666 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1667 return getPtrToInt(GEP,
1668 Type::getInt64Ty(Ty->getContext()));
1671 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1672 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1676 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1677 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1678 // Note that a non-inbounds gep is used, as null isn't within any object.
1679 Constant *GEPIdx[] = {
1680 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1683 Constant *GEP = getGetElementPtr(
1684 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1685 return getPtrToInt(GEP,
1686 Type::getInt64Ty(Ty->getContext()));
1689 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1690 Constant *C1, Constant *C2) {
1691 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1693 switch (Predicate) {
1694 default: llvm_unreachable("Invalid CmpInst predicate");
1695 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1696 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1697 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1698 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1699 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1700 case CmpInst::FCMP_TRUE:
1701 return getFCmp(Predicate, C1, C2);
1703 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1704 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1705 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1706 case CmpInst::ICMP_SLE:
1707 return getICmp(Predicate, C1, C2);
1711 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1712 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1714 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1715 return SC; // Fold common cases
1717 std::vector<Constant*> argVec(3, C);
1720 ExprMapKeyType Key(Instruction::Select, argVec);
1722 LLVMContextImpl *pImpl = C->getContext().pImpl;
1723 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1726 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1728 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1729 return FC; // Fold a few common cases.
1731 // Get the result type of the getelementptr!
1732 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1733 assert(Ty && "GEP indices invalid!");
1734 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1735 Type *ReqTy = Ty->getPointerTo(AS);
1737 assert(C->getType()->isPointerTy() &&
1738 "Non-pointer type for constant GetElementPtr expression");
1739 // Look up the constant in the table first to ensure uniqueness
1740 std::vector<Constant*> ArgVec;
1741 ArgVec.reserve(1 + Idxs.size());
1742 ArgVec.push_back(C);
1743 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1744 ArgVec.push_back(cast<Constant>(Idxs[i]));
1745 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1746 InBounds ? GEPOperator::IsInBounds : 0);
1748 LLVMContextImpl *pImpl = C->getContext().pImpl;
1749 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1753 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1754 assert(LHS->getType() == RHS->getType());
1755 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1756 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1758 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1759 return FC; // Fold a few common cases...
1761 // Look up the constant in the table first to ensure uniqueness
1762 std::vector<Constant*> ArgVec;
1763 ArgVec.push_back(LHS);
1764 ArgVec.push_back(RHS);
1765 // Get the key type with both the opcode and predicate
1766 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1768 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1769 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1770 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1772 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1773 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1777 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1778 assert(LHS->getType() == RHS->getType());
1779 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1781 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1782 return FC; // Fold a few common cases...
1784 // Look up the constant in the table first to ensure uniqueness
1785 std::vector<Constant*> ArgVec;
1786 ArgVec.push_back(LHS);
1787 ArgVec.push_back(RHS);
1788 // Get the key type with both the opcode and predicate
1789 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1791 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1792 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1793 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1795 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1796 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1799 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1800 assert(Val->getType()->isVectorTy() &&
1801 "Tried to create extractelement operation on non-vector type!");
1802 assert(Idx->getType()->isIntegerTy(32) &&
1803 "Extractelement index must be i32 type!");
1805 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1806 return FC; // Fold a few common cases.
1808 // Look up the constant in the table first to ensure uniqueness
1809 std::vector<Constant*> ArgVec(1, Val);
1810 ArgVec.push_back(Idx);
1811 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1813 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1814 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1815 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1818 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1820 assert(Val->getType()->isVectorTy() &&
1821 "Tried to create insertelement operation on non-vector type!");
1822 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1823 && "Insertelement types must match!");
1824 assert(Idx->getType()->isIntegerTy(32) &&
1825 "Insertelement index must be i32 type!");
1827 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1828 return FC; // Fold a few common cases.
1829 // Look up the constant in the table first to ensure uniqueness
1830 std::vector<Constant*> ArgVec(1, Val);
1831 ArgVec.push_back(Elt);
1832 ArgVec.push_back(Idx);
1833 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1835 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1836 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1839 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1841 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1842 "Invalid shuffle vector constant expr operands!");
1844 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1845 return FC; // Fold a few common cases.
1847 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1848 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1849 Type *ShufTy = VectorType::get(EltTy, NElts);
1851 // Look up the constant in the table first to ensure uniqueness
1852 std::vector<Constant*> ArgVec(1, V1);
1853 ArgVec.push_back(V2);
1854 ArgVec.push_back(Mask);
1855 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1857 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1858 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1861 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1862 ArrayRef<unsigned> Idxs) {
1863 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1864 Idxs) == Val->getType() &&
1865 "insertvalue indices invalid!");
1866 assert(Agg->getType()->isFirstClassType() &&
1867 "Non-first-class type for constant insertvalue expression");
1868 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1869 assert(FC && "insertvalue constant expr couldn't be folded!");
1873 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1874 ArrayRef<unsigned> Idxs) {
1875 assert(Agg->getType()->isFirstClassType() &&
1876 "Tried to create extractelement operation on non-first-class type!");
1878 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1880 assert(ReqTy && "extractvalue indices invalid!");
1882 assert(Agg->getType()->isFirstClassType() &&
1883 "Non-first-class type for constant extractvalue expression");
1884 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1885 assert(FC && "ExtractValue constant expr couldn't be folded!");
1889 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1890 assert(C->getType()->isIntOrIntVectorTy() &&
1891 "Cannot NEG a nonintegral value!");
1892 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1896 Constant *ConstantExpr::getFNeg(Constant *C) {
1897 assert(C->getType()->isFPOrFPVectorTy() &&
1898 "Cannot FNEG a non-floating-point value!");
1899 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1902 Constant *ConstantExpr::getNot(Constant *C) {
1903 assert(C->getType()->isIntOrIntVectorTy() &&
1904 "Cannot NOT a nonintegral value!");
1905 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1908 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1909 bool HasNUW, bool HasNSW) {
1910 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1911 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1912 return get(Instruction::Add, C1, C2, Flags);
1915 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1916 return get(Instruction::FAdd, C1, C2);
1919 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1920 bool HasNUW, bool HasNSW) {
1921 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1922 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1923 return get(Instruction::Sub, C1, C2, Flags);
1926 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1927 return get(Instruction::FSub, C1, C2);
1930 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1931 bool HasNUW, bool HasNSW) {
1932 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1933 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1934 return get(Instruction::Mul, C1, C2, Flags);
1937 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1938 return get(Instruction::FMul, C1, C2);
1941 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1942 return get(Instruction::UDiv, C1, C2,
1943 isExact ? PossiblyExactOperator::IsExact : 0);
1946 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1947 return get(Instruction::SDiv, C1, C2,
1948 isExact ? PossiblyExactOperator::IsExact : 0);
1951 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1952 return get(Instruction::FDiv, C1, C2);
1955 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1956 return get(Instruction::URem, C1, C2);
1959 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1960 return get(Instruction::SRem, C1, C2);
1963 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1964 return get(Instruction::FRem, C1, C2);
1967 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1968 return get(Instruction::And, C1, C2);
1971 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1972 return get(Instruction::Or, C1, C2);
1975 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1976 return get(Instruction::Xor, C1, C2);
1979 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1980 bool HasNUW, bool HasNSW) {
1981 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1982 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1983 return get(Instruction::Shl, C1, C2, Flags);
1986 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1987 return get(Instruction::LShr, C1, C2,
1988 isExact ? PossiblyExactOperator::IsExact : 0);
1991 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1992 return get(Instruction::AShr, C1, C2,
1993 isExact ? PossiblyExactOperator::IsExact : 0);
1996 // destroyConstant - Remove the constant from the constant table...
1998 void ConstantExpr::destroyConstant() {
1999 getType()->getContext().pImpl->ExprConstants.remove(this);
2000 destroyConstantImpl();
2003 const char *ConstantExpr::getOpcodeName() const {
2004 return Instruction::getOpcodeName(getOpcode());
2009 GetElementPtrConstantExpr::
2010 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
2012 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2013 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2014 - (IdxList.size()+1), IdxList.size()+1) {
2016 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2017 OperandList[i+1] = IdxList[i];
2020 //===----------------------------------------------------------------------===//
2021 // ConstantData* implementations
2023 void ConstantDataArray::anchor() {}
2024 void ConstantDataVector::anchor() {}
2026 /// getElementType - Return the element type of the array/vector.
2027 Type *ConstantDataSequential::getElementType() const {
2028 return getType()->getElementType();
2031 StringRef ConstantDataSequential::getRawDataValues() const {
2032 return StringRef(DataElements, getNumElements()*getElementByteSize());
2035 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2036 /// formed with a vector or array of the specified element type.
2037 /// ConstantDataArray only works with normal float and int types that are
2038 /// stored densely in memory, not with things like i42 or x86_f80.
2039 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2040 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2041 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2042 switch (IT->getBitWidth()) {
2054 /// getNumElements - Return the number of elements in the array or vector.
2055 unsigned ConstantDataSequential::getNumElements() const {
2056 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2057 return AT->getNumElements();
2058 return cast<VectorType>(getType())->getNumElements();
2062 /// getElementByteSize - Return the size in bytes of the elements in the data.
2063 uint64_t ConstantDataSequential::getElementByteSize() const {
2064 return getElementType()->getPrimitiveSizeInBits()/8;
2067 /// getElementPointer - Return the start of the specified element.
2068 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2069 assert(Elt < getNumElements() && "Invalid Elt");
2070 return DataElements+Elt*getElementByteSize();
2074 /// isAllZeros - return true if the array is empty or all zeros.
2075 static bool isAllZeros(StringRef Arr) {
2076 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2082 /// getImpl - This is the underlying implementation of all of the
2083 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2084 /// the correct element type. We take the bytes in as an StringRef because
2085 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2086 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2087 assert(isElementTypeCompatible(cast<SequentialType>(Ty)->getElementType()));
2088 // If the elements are all zero or there are no elements, return a CAZ, which
2089 // is more dense and canonical.
2090 if (isAllZeros(Elements))
2091 return ConstantAggregateZero::get(Ty);
2093 // Do a lookup to see if we have already formed one of these.
2094 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2095 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2097 // The bucket can point to a linked list of different CDS's that have the same
2098 // body but different types. For example, 0,0,0,1 could be a 4 element array
2099 // of i8, or a 1-element array of i32. They'll both end up in the same
2100 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2101 ConstantDataSequential **Entry = &Slot.getValue();
2102 for (ConstantDataSequential *Node = *Entry; Node != 0;
2103 Entry = &Node->Next, Node = *Entry)
2104 if (Node->getType() == Ty)
2107 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2109 if (isa<ArrayType>(Ty))
2110 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2112 assert(isa<VectorType>(Ty));
2113 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2116 void ConstantDataSequential::destroyConstant() {
2117 // Remove the constant from the StringMap.
2118 StringMap<ConstantDataSequential*> &CDSConstants =
2119 getType()->getContext().pImpl->CDSConstants;
2121 StringMap<ConstantDataSequential*>::iterator Slot =
2122 CDSConstants.find(getRawDataValues());
2124 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2126 ConstantDataSequential **Entry = &Slot->getValue();
2128 // Remove the entry from the hash table.
2129 if ((*Entry)->Next == 0) {
2130 // If there is only one value in the bucket (common case) it must be this
2131 // entry, and removing the entry should remove the bucket completely.
2132 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2133 getContext().pImpl->CDSConstants.erase(Slot);
2135 // Otherwise, there are multiple entries linked off the bucket, unlink the
2136 // node we care about but keep the bucket around.
2137 for (ConstantDataSequential *Node = *Entry; ;
2138 Entry = &Node->Next, Node = *Entry) {
2139 assert(Node && "Didn't find entry in its uniquing hash table!");
2140 // If we found our entry, unlink it from the list and we're done.
2142 *Entry = Node->Next;
2148 // If we were part of a list, make sure that we don't delete the list that is
2149 // still owned by the uniquing map.
2152 // Finally, actually delete it.
2153 destroyConstantImpl();
2156 /// get() constructors - Return a constant with array type with an element
2157 /// count and element type matching the ArrayRef passed in. Note that this
2158 /// can return a ConstantAggregateZero object.
2159 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2160 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2161 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2163 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2164 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2165 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2167 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2168 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2169 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2171 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2172 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2173 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2175 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2176 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2177 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2179 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2180 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2181 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2184 /// getString - This method constructs a CDS and initializes it with a text
2185 /// string. The default behavior (AddNull==true) causes a null terminator to
2186 /// be placed at the end of the array (increasing the length of the string by
2187 /// one more than the StringRef would normally indicate. Pass AddNull=false
2188 /// to disable this behavior.
2189 Constant *ConstantDataArray::getString(LLVMContext &Context,
2190 StringRef Str, bool AddNull) {
2192 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2194 SmallVector<uint8_t, 64> ElementVals;
2195 ElementVals.append(Str.begin(), Str.end());
2196 ElementVals.push_back(0);
2197 return get(Context, ElementVals);
2200 /// get() constructors - Return a constant with vector type with an element
2201 /// count and element type matching the ArrayRef passed in. Note that this
2202 /// can return a ConstantAggregateZero object.
2203 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2204 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2205 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2207 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2208 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2209 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2211 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2212 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2213 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2215 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2216 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2217 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2219 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2220 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2221 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2223 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2224 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2225 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2228 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2229 assert(isElementTypeCompatible(V->getType()) &&
2230 "Element type not compatible with ConstantData");
2231 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2232 if (CI->getType()->isIntegerTy(8)) {
2233 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2234 return get(V->getContext(), Elts);
2236 if (CI->getType()->isIntegerTy(16)) {
2237 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2238 return get(V->getContext(), Elts);
2240 if (CI->getType()->isIntegerTy(32)) {
2241 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2242 return get(V->getContext(), Elts);
2244 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2245 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2246 return get(V->getContext(), Elts);
2249 ConstantFP *CFP = cast<ConstantFP>(V);
2250 if (CFP->getType()->isFloatTy()) {
2251 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2252 return get(V->getContext(), Elts);
2254 assert(CFP->getType()->isDoubleTy() && "Unsupported ConstantData type");
2255 SmallVector<double, 16> Elts(NumElts, CFP->getValueAPF().convertToDouble());
2256 return get(V->getContext(), Elts);
2260 /// getElementAsInteger - If this is a sequential container of integers (of
2261 /// any size), return the specified element in the low bits of a uint64_t.
2262 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2263 assert(isa<IntegerType>(getElementType()) &&
2264 "Accessor can only be used when element is an integer");
2265 const char *EltPtr = getElementPointer(Elt);
2267 // The data is stored in host byte order, make sure to cast back to the right
2268 // type to load with the right endianness.
2269 switch (cast<IntegerType>(getElementType())->getBitWidth()) {
2270 default: assert(0 && "Invalid bitwidth for CDS");
2271 case 8: return *(uint8_t*)EltPtr;
2272 case 16: return *(uint16_t*)EltPtr;
2273 case 32: return *(uint32_t*)EltPtr;
2274 case 64: return *(uint64_t*)EltPtr;
2278 /// getElementAsAPFloat - If this is a sequential container of floating point
2279 /// type, return the specified element as an APFloat.
2280 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2281 const char *EltPtr = getElementPointer(Elt);
2283 switch (getElementType()->getTypeID()) {
2285 assert(0 && "Accessor can only be used when element is float/double!");
2286 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2287 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2291 /// getElementAsFloat - If this is an sequential container of floats, return
2292 /// the specified element as a float.
2293 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2294 assert(getElementType()->isFloatTy() &&
2295 "Accessor can only be used when element is a 'float'");
2296 return *(float*)getElementPointer(Elt);
2299 /// getElementAsDouble - If this is an sequential container of doubles, return
2300 /// the specified element as a float.
2301 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2302 assert(getElementType()->isDoubleTy() &&
2303 "Accessor can only be used when element is a 'float'");
2304 return *(double*)getElementPointer(Elt);
2307 /// getElementAsConstant - Return a Constant for a specified index's element.
2308 /// Note that this has to compute a new constant to return, so it isn't as
2309 /// efficient as getElementAsInteger/Float/Double.
2310 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2311 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2312 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2314 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2317 /// isString - This method returns true if this is an array of i8.
2318 bool ConstantDataSequential::isString() const {
2319 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2322 /// isCString - This method returns true if the array "isString", ends with a
2323 /// nul byte, and does not contains any other nul bytes.
2324 bool ConstantDataSequential::isCString() const {
2328 StringRef Str = getAsString();
2330 // The last value must be nul.
2331 if (Str.back() != 0) return false;
2333 // Other elements must be non-nul.
2334 return Str.drop_back().find(0) == StringRef::npos;
2338 //===----------------------------------------------------------------------===//
2339 // replaceUsesOfWithOnConstant implementations
2341 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2342 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2345 /// Note that we intentionally replace all uses of From with To here. Consider
2346 /// a large array that uses 'From' 1000 times. By handling this case all here,
2347 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2348 /// single invocation handles all 1000 uses. Handling them one at a time would
2349 /// work, but would be really slow because it would have to unique each updated
2352 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2354 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2355 Constant *ToC = cast<Constant>(To);
2357 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2359 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2360 Lookup.first.first = cast<ArrayType>(getType());
2361 Lookup.second = this;
2363 std::vector<Constant*> &Values = Lookup.first.second;
2364 Values.reserve(getNumOperands()); // Build replacement array.
2366 // Fill values with the modified operands of the constant array. Also,
2367 // compute whether this turns into an all-zeros array.
2368 bool isAllZeros = false;
2369 unsigned NumUpdated = 0;
2370 if (!ToC->isNullValue()) {
2371 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2372 Constant *Val = cast<Constant>(O->get());
2377 Values.push_back(Val);
2381 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2382 Constant *Val = cast<Constant>(O->get());
2387 Values.push_back(Val);
2388 if (isAllZeros) isAllZeros = Val->isNullValue();
2392 Constant *Replacement = 0;
2394 Replacement = ConstantAggregateZero::get(getType());
2396 // Check to see if we have this array type already.
2398 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2399 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2402 Replacement = I->second;
2404 // Okay, the new shape doesn't exist in the system yet. Instead of
2405 // creating a new constant array, inserting it, replaceallusesof'ing the
2406 // old with the new, then deleting the old... just update the current one
2408 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2410 // Update to the new value. Optimize for the case when we have a single
2411 // operand that we're changing, but handle bulk updates efficiently.
2412 if (NumUpdated == 1) {
2413 unsigned OperandToUpdate = U - OperandList;
2414 assert(getOperand(OperandToUpdate) == From &&
2415 "ReplaceAllUsesWith broken!");
2416 setOperand(OperandToUpdate, ToC);
2418 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2419 if (getOperand(i) == From)
2426 // Otherwise, I do need to replace this with an existing value.
2427 assert(Replacement != this && "I didn't contain From!");
2429 // Everyone using this now uses the replacement.
2430 replaceAllUsesWith(Replacement);
2432 // Delete the old constant!
2436 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2438 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2439 Constant *ToC = cast<Constant>(To);
2441 unsigned OperandToUpdate = U-OperandList;
2442 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2444 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2445 Lookup.first.first = cast<StructType>(getType());
2446 Lookup.second = this;
2447 std::vector<Constant*> &Values = Lookup.first.second;
2448 Values.reserve(getNumOperands()); // Build replacement struct.
2451 // Fill values with the modified operands of the constant struct. Also,
2452 // compute whether this turns into an all-zeros struct.
2453 bool isAllZeros = false;
2454 if (!ToC->isNullValue()) {
2455 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2456 Values.push_back(cast<Constant>(O->get()));
2459 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2460 Constant *Val = cast<Constant>(O->get());
2461 Values.push_back(Val);
2462 if (isAllZeros) isAllZeros = Val->isNullValue();
2465 Values[OperandToUpdate] = ToC;
2467 LLVMContextImpl *pImpl = getContext().pImpl;
2469 Constant *Replacement = 0;
2471 Replacement = ConstantAggregateZero::get(getType());
2473 // Check to see if we have this struct type already.
2475 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2476 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2479 Replacement = I->second;
2481 // Okay, the new shape doesn't exist in the system yet. Instead of
2482 // creating a new constant struct, inserting it, replaceallusesof'ing the
2483 // old with the new, then deleting the old... just update the current one
2485 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2487 // Update to the new value.
2488 setOperand(OperandToUpdate, ToC);
2493 assert(Replacement != this && "I didn't contain From!");
2495 // Everyone using this now uses the replacement.
2496 replaceAllUsesWith(Replacement);
2498 // Delete the old constant!
2502 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2504 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2506 std::vector<Constant*> Values;
2507 Values.reserve(getNumOperands()); // Build replacement array...
2508 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2509 Constant *Val = getOperand(i);
2510 if (Val == From) Val = cast<Constant>(To);
2511 Values.push_back(Val);
2514 Constant *Replacement = get(Values);
2515 assert(Replacement != this && "I didn't contain From!");
2517 // Everyone using this now uses the replacement.
2518 replaceAllUsesWith(Replacement);
2520 // Delete the old constant!
2524 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2526 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2527 Constant *To = cast<Constant>(ToV);
2529 Constant *Replacement = 0;
2530 if (getOpcode() == Instruction::GetElementPtr) {
2531 SmallVector<Constant*, 8> Indices;
2532 Constant *Pointer = getOperand(0);
2533 Indices.reserve(getNumOperands()-1);
2534 if (Pointer == From) Pointer = To;
2536 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2537 Constant *Val = getOperand(i);
2538 if (Val == From) Val = To;
2539 Indices.push_back(Val);
2541 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2542 cast<GEPOperator>(this)->isInBounds());
2543 } else if (getOpcode() == Instruction::ExtractValue) {
2544 Constant *Agg = getOperand(0);
2545 if (Agg == From) Agg = To;
2547 ArrayRef<unsigned> Indices = getIndices();
2548 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2549 } else if (getOpcode() == Instruction::InsertValue) {
2550 Constant *Agg = getOperand(0);
2551 Constant *Val = getOperand(1);
2552 if (Agg == From) Agg = To;
2553 if (Val == From) Val = To;
2555 ArrayRef<unsigned> Indices = getIndices();
2556 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2557 } else if (isCast()) {
2558 assert(getOperand(0) == From && "Cast only has one use!");
2559 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2560 } else if (getOpcode() == Instruction::Select) {
2561 Constant *C1 = getOperand(0);
2562 Constant *C2 = getOperand(1);
2563 Constant *C3 = getOperand(2);
2564 if (C1 == From) C1 = To;
2565 if (C2 == From) C2 = To;
2566 if (C3 == From) C3 = To;
2567 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2568 } else if (getOpcode() == Instruction::ExtractElement) {
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::getExtractElement(C1, C2);
2574 } else if (getOpcode() == Instruction::InsertElement) {
2575 Constant *C1 = getOperand(0);
2576 Constant *C2 = getOperand(1);
2577 Constant *C3 = getOperand(1);
2578 if (C1 == From) C1 = To;
2579 if (C2 == From) C2 = To;
2580 if (C3 == From) C3 = To;
2581 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2582 } else if (getOpcode() == Instruction::ShuffleVector) {
2583 Constant *C1 = getOperand(0);
2584 Constant *C2 = getOperand(1);
2585 Constant *C3 = getOperand(2);
2586 if (C1 == From) C1 = To;
2587 if (C2 == From) C2 = To;
2588 if (C3 == From) C3 = To;
2589 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2590 } else if (isCompare()) {
2591 Constant *C1 = getOperand(0);
2592 Constant *C2 = getOperand(1);
2593 if (C1 == From) C1 = To;
2594 if (C2 == From) C2 = To;
2595 if (getOpcode() == Instruction::ICmp)
2596 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2598 assert(getOpcode() == Instruction::FCmp);
2599 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2601 } else if (getNumOperands() == 2) {
2602 Constant *C1 = getOperand(0);
2603 Constant *C2 = getOperand(1);
2604 if (C1 == From) C1 = To;
2605 if (C2 == From) C2 = To;
2606 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2608 llvm_unreachable("Unknown ConstantExpr type!");
2611 assert(Replacement != this && "I didn't contain From!");
2613 // Everyone using this now uses the replacement.
2614 replaceAllUsesWith(Replacement);
2616 // Delete the old constant!