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 "LLVMContextImpl.h"
15 #include "llvm/Constants.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/System/Mutex.h"
31 #include "llvm/System/RWMutex.h"
32 #include "llvm/System/Threading.h"
33 #include "llvm/ADT/DenseMap.h"
34 #include "llvm/ADT/SmallVector.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 // Constructor to create a '0' constant of arbitrary type...
44 static const uint64_t zero[2] = {0, 0};
45 Constant* Constant::getNullValue(const Type* Ty) {
46 switch (Ty->getTypeID()) {
47 case Type::IntegerTyID:
48 return ConstantInt::get(Ty, 0);
50 return ConstantFP::get(Ty->getContext(), APFloat(APInt(32, 0)));
51 case Type::DoubleTyID:
52 return ConstantFP::get(Ty->getContext(), APFloat(APInt(64, 0)));
53 case Type::X86_FP80TyID:
54 return ConstantFP::get(Ty->getContext(), APFloat(APInt(80, 2, zero)));
56 return ConstantFP::get(Ty->getContext(),
57 APFloat(APInt(128, 2, zero), true));
58 case Type::PPC_FP128TyID:
59 return ConstantFP::get(Ty->getContext(), APFloat(APInt(128, 2, zero)));
60 case Type::PointerTyID:
61 return ConstantPointerNull::get(cast<PointerType>(Ty));
62 case Type::StructTyID:
64 case Type::VectorTyID:
65 return ConstantAggregateZero::get(Ty);
67 // Function, Label, or Opaque type?
68 assert(!"Cannot create a null constant of that type!");
73 Constant* Constant::getIntegerValue(const Type* Ty, const APInt &V) {
74 const Type *ScalarTy = Ty->getScalarType();
76 // Create the base integer constant.
77 Constant *C = ConstantInt::get(Ty->getContext(), V);
79 // Convert an integer to a pointer, if necessary.
80 if (const PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
81 C = ConstantExpr::getIntToPtr(C, PTy);
83 // Broadcast a scalar to a vector, if necessary.
84 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
85 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
90 Constant* Constant::getAllOnesValue(const Type* Ty) {
91 if (const IntegerType* ITy = dyn_cast<IntegerType>(Ty))
92 return ConstantInt::get(Ty->getContext(),
93 APInt::getAllOnesValue(ITy->getBitWidth()));
95 std::vector<Constant*> Elts;
96 const VectorType* VTy = cast<VectorType>(Ty);
97 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
98 assert(Elts[0] && "Not a vector integer type!");
99 return cast<ConstantVector>(ConstantVector::get(Elts));
102 void Constant::destroyConstantImpl() {
103 // When a Constant is destroyed, there may be lingering
104 // references to the constant by other constants in the constant pool. These
105 // constants are implicitly dependent on the module that is being deleted,
106 // but they don't know that. Because we only find out when the CPV is
107 // deleted, we must now notify all of our users (that should only be
108 // Constants) that they are, in fact, invalid now and should be deleted.
110 while (!use_empty()) {
111 Value *V = use_back();
112 #ifndef NDEBUG // Only in -g mode...
113 if (!isa<Constant>(V))
114 DOUT << "While deleting: " << *this
115 << "\n\nUse still stuck around after Def is destroyed: "
118 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
119 Constant *CV = cast<Constant>(V);
120 CV->destroyConstant();
122 // The constant should remove itself from our use list...
123 assert((use_empty() || use_back() != V) && "Constant not removed!");
126 // Value has no outstanding references it is safe to delete it now...
130 /// canTrap - Return true if evaluation of this constant could trap. This is
131 /// true for things like constant expressions that could divide by zero.
132 bool Constant::canTrap() const {
133 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
134 // The only thing that could possibly trap are constant exprs.
135 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
136 if (!CE) return false;
138 // ConstantExpr traps if any operands can trap.
139 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
140 if (getOperand(i)->canTrap())
143 // Otherwise, only specific operations can trap.
144 switch (CE->getOpcode()) {
147 case Instruction::UDiv:
148 case Instruction::SDiv:
149 case Instruction::FDiv:
150 case Instruction::URem:
151 case Instruction::SRem:
152 case Instruction::FRem:
153 // Div and rem can trap if the RHS is not known to be non-zero.
154 if (!isa<ConstantInt>(getOperand(1)) || getOperand(1)->isNullValue())
161 /// getRelocationInfo - This method classifies the entry according to
162 /// whether or not it may generate a relocation entry. This must be
163 /// conservative, so if it might codegen to a relocatable entry, it should say
164 /// so. The return values are:
166 /// NoRelocation: This constant pool entry is guaranteed to never have a
167 /// relocation applied to it (because it holds a simple constant like
169 /// LocalRelocation: This entry has relocations, but the entries are
170 /// guaranteed to be resolvable by the static linker, so the dynamic
171 /// linker will never see them.
172 /// GlobalRelocations: This entry may have arbitrary relocations.
174 /// FIXME: This really should not be in VMCore.
175 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
176 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
177 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
178 return LocalRelocation; // Local to this file/library.
179 return GlobalRelocations; // Global reference.
182 PossibleRelocationsTy Result = NoRelocation;
183 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
184 Result = std::max(Result, getOperand(i)->getRelocationInfo());
190 /// getVectorElements - This method, which is only valid on constant of vector
191 /// type, returns the elements of the vector in the specified smallvector.
192 /// This handles breaking down a vector undef into undef elements, etc. For
193 /// constant exprs and other cases we can't handle, we return an empty vector.
194 void Constant::getVectorElements(LLVMContext &Context,
195 SmallVectorImpl<Constant*> &Elts) const {
196 assert(isa<VectorType>(getType()) && "Not a vector constant!");
198 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
199 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
200 Elts.push_back(CV->getOperand(i));
204 const VectorType *VT = cast<VectorType>(getType());
205 if (isa<ConstantAggregateZero>(this)) {
206 Elts.assign(VT->getNumElements(),
207 Constant::getNullValue(VT->getElementType()));
211 if (isa<UndefValue>(this)) {
212 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
216 // Unknown type, must be constant expr etc.
221 //===----------------------------------------------------------------------===//
223 //===----------------------------------------------------------------------===//
225 ConstantInt::ConstantInt(const IntegerType *Ty, const APInt& V)
226 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
227 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
230 ConstantInt* ConstantInt::getTrue(LLVMContext &Context) {
231 LLVMContextImpl *pImpl = Context.pImpl;
232 sys::SmartScopedWriter<true>(pImpl->ConstantsLock);
233 if (pImpl->TheTrueVal)
234 return pImpl->TheTrueVal;
236 return (pImpl->TheTrueVal = ConstantInt::get(IntegerType::get(1), 1));
239 ConstantInt* ConstantInt::getFalse(LLVMContext &Context) {
240 LLVMContextImpl *pImpl = Context.pImpl;
241 sys::SmartScopedWriter<true>(pImpl->ConstantsLock);
242 if (pImpl->TheFalseVal)
243 return pImpl->TheFalseVal;
245 return (pImpl->TheFalseVal = ConstantInt::get(IntegerType::get(1), 0));
249 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
250 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
251 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
252 // compare APInt's of different widths, which would violate an APInt class
253 // invariant which generates an assertion.
254 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt& V) {
255 // Get the corresponding integer type for the bit width of the value.
256 const IntegerType *ITy = IntegerType::get(V.getBitWidth());
257 // get an existing value or the insertion position
258 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
260 Context.pImpl->ConstantsLock.reader_acquire();
261 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
262 Context.pImpl->ConstantsLock.reader_release();
265 sys::SmartScopedWriter<true> Writer(Context.pImpl->ConstantsLock);
266 ConstantInt *&NewSlot = Context.pImpl->IntConstants[Key];
268 NewSlot = new ConstantInt(ITy, V);
277 Constant* ConstantInt::get(const Type* Ty, uint64_t V, bool isSigned) {
278 Constant *C = get(cast<IntegerType>(Ty->getScalarType()),
281 // For vectors, broadcast the value.
282 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
283 return ConstantVector::get(
284 std::vector<Constant *>(VTy->getNumElements(), C));
289 ConstantInt* ConstantInt::get(const IntegerType* Ty, uint64_t V,
291 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
294 ConstantInt* ConstantInt::getSigned(const IntegerType* Ty, int64_t V) {
295 return get(Ty, V, true);
298 Constant *ConstantInt::getSigned(const Type *Ty, int64_t V) {
299 return get(Ty, V, true);
302 Constant* ConstantInt::get(const Type* Ty, const APInt& V) {
303 ConstantInt *C = get(Ty->getContext(), V);
304 assert(C->getType() == Ty->getScalarType() &&
305 "ConstantInt type doesn't match the type implied by its value!");
307 // For vectors, broadcast the value.
308 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
309 return ConstantVector::get(
310 std::vector<Constant *>(VTy->getNumElements(), C));
315 //===----------------------------------------------------------------------===//
317 //===----------------------------------------------------------------------===//
319 static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
320 if (Ty == Type::FloatTy)
321 return &APFloat::IEEEsingle;
322 if (Ty == Type::DoubleTy)
323 return &APFloat::IEEEdouble;
324 if (Ty == Type::X86_FP80Ty)
325 return &APFloat::x87DoubleExtended;
326 else if (Ty == Type::FP128Ty)
327 return &APFloat::IEEEquad;
329 assert(Ty == Type::PPC_FP128Ty && "Unknown FP format");
330 return &APFloat::PPCDoubleDouble;
333 /// get() - This returns a constant fp for the specified value in the
334 /// specified type. This should only be used for simple constant values like
335 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
336 Constant* ConstantFP::get(const Type* Ty, double V) {
337 LLVMContext &Context = Ty->getContext();
341 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
342 APFloat::rmNearestTiesToEven, &ignored);
343 Constant *C = get(Context, FV);
345 // For vectors, broadcast the value.
346 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
347 return ConstantVector::get(
348 std::vector<Constant *>(VTy->getNumElements(), C));
353 ConstantFP* ConstantFP::getNegativeZero(const Type* Ty) {
354 LLVMContext &Context = Ty->getContext();
355 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
357 return get(Context, apf);
361 Constant* ConstantFP::getZeroValueForNegation(const Type* Ty) {
362 if (const VectorType *PTy = dyn_cast<VectorType>(Ty))
363 if (PTy->getElementType()->isFloatingPoint()) {
364 std::vector<Constant*> zeros(PTy->getNumElements(),
365 getNegativeZero(PTy->getElementType()));
366 return ConstantVector::get(PTy, zeros);
369 if (Ty->isFloatingPoint())
370 return getNegativeZero(Ty);
372 return Constant::getNullValue(Ty);
376 // ConstantFP accessors.
377 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
378 DenseMapAPFloatKeyInfo::KeyTy Key(V);
380 LLVMContextImpl* pImpl = Context.pImpl;
382 pImpl->ConstantsLock.reader_acquire();
383 ConstantFP *&Slot = pImpl->FPConstants[Key];
384 pImpl->ConstantsLock.reader_release();
387 sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
388 ConstantFP *&NewSlot = pImpl->FPConstants[Key];
391 if (&V.getSemantics() == &APFloat::IEEEsingle)
393 else if (&V.getSemantics() == &APFloat::IEEEdouble)
395 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
396 Ty = Type::X86_FP80Ty;
397 else if (&V.getSemantics() == &APFloat::IEEEquad)
400 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
401 "Unknown FP format");
402 Ty = Type::PPC_FP128Ty;
404 NewSlot = new ConstantFP(Ty, V);
413 ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
414 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
415 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
419 bool ConstantFP::isNullValue() const {
420 return Val.isZero() && !Val.isNegative();
423 bool ConstantFP::isExactlyValue(const APFloat& V) const {
424 return Val.bitwiseIsEqual(V);
427 //===----------------------------------------------------------------------===//
428 // ConstantXXX Classes
429 //===----------------------------------------------------------------------===//
432 ConstantArray::ConstantArray(const ArrayType *T,
433 const std::vector<Constant*> &V)
434 : Constant(T, ConstantArrayVal,
435 OperandTraits<ConstantArray>::op_end(this) - V.size(),
437 assert(V.size() == T->getNumElements() &&
438 "Invalid initializer vector for constant array");
439 Use *OL = OperandList;
440 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
443 assert((C->getType() == T->getElementType() ||
445 C->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
446 "Initializer for array element doesn't match array element type!");
451 Constant *ConstantArray::get(const ArrayType *Ty,
452 const std::vector<Constant*> &V) {
453 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
454 // If this is an all-zero array, return a ConstantAggregateZero object
457 if (!C->isNullValue()) {
458 // Implicitly locked.
459 return pImpl->ArrayConstants.getOrCreate(Ty, V);
461 for (unsigned i = 1, e = V.size(); i != e; ++i)
463 // Implicitly locked.
464 return pImpl->ArrayConstants.getOrCreate(Ty, V);
468 return ConstantAggregateZero::get(Ty);
472 Constant* ConstantArray::get(const ArrayType* T, Constant* const* Vals,
474 // FIXME: make this the primary ctor method.
475 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
478 /// ConstantArray::get(const string&) - Return an array that is initialized to
479 /// contain the specified string. If length is zero then a null terminator is
480 /// added to the specified string so that it may be used in a natural way.
481 /// Otherwise, the length parameter specifies how much of the string to use
482 /// and it won't be null terminated.
484 Constant* ConstantArray::get(const StringRef &Str, bool AddNull) {
485 std::vector<Constant*> ElementVals;
486 for (unsigned i = 0; i < Str.size(); ++i)
487 ElementVals.push_back(ConstantInt::get(Type::Int8Ty, Str[i]));
489 // Add a null terminator to the string...
491 ElementVals.push_back(ConstantInt::get(Type::Int8Ty, 0));
494 ArrayType *ATy = ArrayType::get(Type::Int8Ty, ElementVals.size());
495 return get(ATy, ElementVals);
500 ConstantStruct::ConstantStruct(const StructType *T,
501 const std::vector<Constant*> &V)
502 : Constant(T, ConstantStructVal,
503 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
505 assert(V.size() == T->getNumElements() &&
506 "Invalid initializer vector for constant structure");
507 Use *OL = OperandList;
508 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
511 assert((C->getType() == T->getElementType(I-V.begin()) ||
512 ((T->getElementType(I-V.begin())->isAbstract() ||
513 C->getType()->isAbstract()) &&
514 T->getElementType(I-V.begin())->getTypeID() ==
515 C->getType()->getTypeID())) &&
516 "Initializer for struct element doesn't match struct element type!");
521 // ConstantStruct accessors.
522 Constant* ConstantStruct::get(const StructType* T,
523 const std::vector<Constant*>& V) {
524 LLVMContextImpl* pImpl = T->getContext().pImpl;
526 // Create a ConstantAggregateZero value if all elements are zeros...
527 for (unsigned i = 0, e = V.size(); i != e; ++i)
528 if (!V[i]->isNullValue())
529 // Implicitly locked.
530 return pImpl->StructConstants.getOrCreate(T, V);
532 return ConstantAggregateZero::get(T);
535 Constant* ConstantStruct::get(LLVMContext &Context,
536 const std::vector<Constant*>& V, bool packed) {
537 std::vector<const Type*> StructEls;
538 StructEls.reserve(V.size());
539 for (unsigned i = 0, e = V.size(); i != e; ++i)
540 StructEls.push_back(V[i]->getType());
541 return get(StructType::get(Context, StructEls, packed), V);
544 Constant* ConstantStruct::get(LLVMContext &Context,
545 Constant* const *Vals, unsigned NumVals,
547 // FIXME: make this the primary ctor method.
548 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
551 ConstantVector::ConstantVector(const VectorType *T,
552 const std::vector<Constant*> &V)
553 : Constant(T, ConstantVectorVal,
554 OperandTraits<ConstantVector>::op_end(this) - V.size(),
556 Use *OL = OperandList;
557 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
560 assert((C->getType() == T->getElementType() ||
562 C->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
563 "Initializer for vector element doesn't match vector element type!");
568 // ConstantVector accessors.
569 Constant* ConstantVector::get(const VectorType* T,
570 const std::vector<Constant*>& V) {
571 assert(!V.empty() && "Vectors can't be empty");
572 LLVMContext &Context = T->getContext();
573 LLVMContextImpl *pImpl = Context.pImpl;
575 // If this is an all-undef or alll-zero vector, return a
576 // ConstantAggregateZero or UndefValue.
578 bool isZero = C->isNullValue();
579 bool isUndef = isa<UndefValue>(C);
581 if (isZero || isUndef) {
582 for (unsigned i = 1, e = V.size(); i != e; ++i)
584 isZero = isUndef = false;
590 return ConstantAggregateZero::get(T);
592 return UndefValue::get(T);
594 // Implicitly locked.
595 return pImpl->VectorConstants.getOrCreate(T, V);
598 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
599 assert(!V.empty() && "Cannot infer type if V is empty");
600 return get(VectorType::get(V.front()->getType(),V.size()), V);
603 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
604 // FIXME: make this the primary ctor method.
605 return get(std::vector<Constant*>(Vals, Vals+NumVals));
608 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
609 Constant *C = getSDiv(C1, C2);
610 // Set exact attribute, assuming constant folding didn't eliminate the
612 if (SDivOperator *SDiv = dyn_cast<SDivOperator>(C))
613 SDiv->setIsExact(true);
617 // Utility function for determining if a ConstantExpr is a CastOp or not. This
618 // can't be inline because we don't want to #include Instruction.h into
620 bool ConstantExpr::isCast() const {
621 return Instruction::isCast(getOpcode());
624 bool ConstantExpr::isCompare() const {
625 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
628 bool ConstantExpr::hasIndices() const {
629 return getOpcode() == Instruction::ExtractValue ||
630 getOpcode() == Instruction::InsertValue;
633 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
634 if (const ExtractValueConstantExpr *EVCE =
635 dyn_cast<ExtractValueConstantExpr>(this))
636 return EVCE->Indices;
638 return cast<InsertValueConstantExpr>(this)->Indices;
641 unsigned ConstantExpr::getPredicate() const {
642 assert(getOpcode() == Instruction::FCmp ||
643 getOpcode() == Instruction::ICmp);
644 return ((const CompareConstantExpr*)this)->predicate;
647 /// getWithOperandReplaced - Return a constant expression identical to this
648 /// one, but with the specified operand set to the specified value.
650 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
651 assert(OpNo < getNumOperands() && "Operand num is out of range!");
652 assert(Op->getType() == getOperand(OpNo)->getType() &&
653 "Replacing operand with value of different type!");
654 if (getOperand(OpNo) == Op)
655 return const_cast<ConstantExpr*>(this);
657 Constant *Op0, *Op1, *Op2;
658 switch (getOpcode()) {
659 case Instruction::Trunc:
660 case Instruction::ZExt:
661 case Instruction::SExt:
662 case Instruction::FPTrunc:
663 case Instruction::FPExt:
664 case Instruction::UIToFP:
665 case Instruction::SIToFP:
666 case Instruction::FPToUI:
667 case Instruction::FPToSI:
668 case Instruction::PtrToInt:
669 case Instruction::IntToPtr:
670 case Instruction::BitCast:
671 return ConstantExpr::getCast(getOpcode(), Op, getType());
672 case Instruction::Select:
673 Op0 = (OpNo == 0) ? Op : getOperand(0);
674 Op1 = (OpNo == 1) ? Op : getOperand(1);
675 Op2 = (OpNo == 2) ? Op : getOperand(2);
676 return ConstantExpr::getSelect(Op0, Op1, Op2);
677 case Instruction::InsertElement:
678 Op0 = (OpNo == 0) ? Op : getOperand(0);
679 Op1 = (OpNo == 1) ? Op : getOperand(1);
680 Op2 = (OpNo == 2) ? Op : getOperand(2);
681 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
682 case Instruction::ExtractElement:
683 Op0 = (OpNo == 0) ? Op : getOperand(0);
684 Op1 = (OpNo == 1) ? Op : getOperand(1);
685 return ConstantExpr::getExtractElement(Op0, Op1);
686 case Instruction::ShuffleVector:
687 Op0 = (OpNo == 0) ? Op : getOperand(0);
688 Op1 = (OpNo == 1) ? Op : getOperand(1);
689 Op2 = (OpNo == 2) ? Op : getOperand(2);
690 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
691 case Instruction::GetElementPtr: {
692 SmallVector<Constant*, 8> Ops;
693 Ops.resize(getNumOperands()-1);
694 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
695 Ops[i-1] = getOperand(i);
697 return ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
699 return ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
702 assert(getNumOperands() == 2 && "Must be binary operator?");
703 Op0 = (OpNo == 0) ? Op : getOperand(0);
704 Op1 = (OpNo == 1) ? Op : getOperand(1);
705 return ConstantExpr::get(getOpcode(), Op0, Op1);
709 /// getWithOperands - This returns the current constant expression with the
710 /// operands replaced with the specified values. The specified operands must
711 /// match count and type with the existing ones.
712 Constant *ConstantExpr::
713 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
714 assert(NumOps == getNumOperands() && "Operand count mismatch!");
715 bool AnyChange = false;
716 for (unsigned i = 0; i != NumOps; ++i) {
717 assert(Ops[i]->getType() == getOperand(i)->getType() &&
718 "Operand type mismatch!");
719 AnyChange |= Ops[i] != getOperand(i);
721 if (!AnyChange) // No operands changed, return self.
722 return const_cast<ConstantExpr*>(this);
724 switch (getOpcode()) {
725 case Instruction::Trunc:
726 case Instruction::ZExt:
727 case Instruction::SExt:
728 case Instruction::FPTrunc:
729 case Instruction::FPExt:
730 case Instruction::UIToFP:
731 case Instruction::SIToFP:
732 case Instruction::FPToUI:
733 case Instruction::FPToSI:
734 case Instruction::PtrToInt:
735 case Instruction::IntToPtr:
736 case Instruction::BitCast:
737 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
738 case Instruction::Select:
739 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
740 case Instruction::InsertElement:
741 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
742 case Instruction::ExtractElement:
743 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
744 case Instruction::ShuffleVector:
745 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
746 case Instruction::GetElementPtr:
747 return ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
748 case Instruction::ICmp:
749 case Instruction::FCmp:
750 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
752 assert(getNumOperands() == 2 && "Must be binary operator?");
753 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1]);
758 //===----------------------------------------------------------------------===//
759 // isValueValidForType implementations
761 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
762 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
763 if (Ty == Type::Int1Ty)
764 return Val == 0 || Val == 1;
766 return true; // always true, has to fit in largest type
767 uint64_t Max = (1ll << NumBits) - 1;
771 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
772 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
773 if (Ty == Type::Int1Ty)
774 return Val == 0 || Val == 1 || Val == -1;
776 return true; // always true, has to fit in largest type
777 int64_t Min = -(1ll << (NumBits-1));
778 int64_t Max = (1ll << (NumBits-1)) - 1;
779 return (Val >= Min && Val <= Max);
782 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
783 // convert modifies in place, so make a copy.
784 APFloat Val2 = APFloat(Val);
786 switch (Ty->getTypeID()) {
788 return false; // These can't be represented as floating point!
790 // FIXME rounding mode needs to be more flexible
791 case Type::FloatTyID: {
792 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
794 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
797 case Type::DoubleTyID: {
798 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
799 &Val2.getSemantics() == &APFloat::IEEEdouble)
801 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
804 case Type::X86_FP80TyID:
805 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
806 &Val2.getSemantics() == &APFloat::IEEEdouble ||
807 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
808 case Type::FP128TyID:
809 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
810 &Val2.getSemantics() == &APFloat::IEEEdouble ||
811 &Val2.getSemantics() == &APFloat::IEEEquad;
812 case Type::PPC_FP128TyID:
813 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
814 &Val2.getSemantics() == &APFloat::IEEEdouble ||
815 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
819 //===----------------------------------------------------------------------===//
820 // Factory Function Implementation
822 static char getValType(ConstantAggregateZero *CPZ) { return 0; }
824 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
825 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
826 "Cannot create an aggregate zero of non-aggregate type!");
828 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
829 // Implicitly locked.
830 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
833 /// destroyConstant - Remove the constant from the constant table...
835 void ConstantAggregateZero::destroyConstant() {
836 // Implicitly locked.
837 getType()->getContext().pImpl->AggZeroConstants.remove(this);
838 destroyConstantImpl();
841 /// destroyConstant - Remove the constant from the constant table...
843 void ConstantArray::destroyConstant() {
844 // Implicitly locked.
845 getType()->getContext().pImpl->ArrayConstants.remove(this);
846 destroyConstantImpl();
849 /// isString - This method returns true if the array is an array of i8, and
850 /// if the elements of the array are all ConstantInt's.
851 bool ConstantArray::isString() const {
852 // Check the element type for i8...
853 if (getType()->getElementType() != Type::Int8Ty)
855 // Check the elements to make sure they are all integers, not constant
857 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
858 if (!isa<ConstantInt>(getOperand(i)))
863 /// isCString - This method returns true if the array is a string (see
864 /// isString) and it ends in a null byte \\0 and does not contains any other
865 /// null bytes except its terminator.
866 bool ConstantArray::isCString() const {
867 // Check the element type for i8...
868 if (getType()->getElementType() != Type::Int8Ty)
871 // Last element must be a null.
872 if (!getOperand(getNumOperands()-1)->isNullValue())
874 // Other elements must be non-null integers.
875 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
876 if (!isa<ConstantInt>(getOperand(i)))
878 if (getOperand(i)->isNullValue())
885 /// getAsString - If the sub-element type of this array is i8
886 /// then this method converts the array to an std::string and returns it.
887 /// Otherwise, it asserts out.
889 std::string ConstantArray::getAsString() const {
890 assert(isString() && "Not a string!");
892 Result.reserve(getNumOperands());
893 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
894 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
899 //---- ConstantStruct::get() implementation...
906 // destroyConstant - Remove the constant from the constant table...
908 void ConstantStruct::destroyConstant() {
909 // Implicitly locked.
910 getType()->getContext().pImpl->StructConstants.remove(this);
911 destroyConstantImpl();
914 // destroyConstant - Remove the constant from the constant table...
916 void ConstantVector::destroyConstant() {
917 // Implicitly locked.
918 getType()->getContext().pImpl->VectorConstants.remove(this);
919 destroyConstantImpl();
922 /// This function will return true iff every element in this vector constant
923 /// is set to all ones.
924 /// @returns true iff this constant's emements are all set to all ones.
925 /// @brief Determine if the value is all ones.
926 bool ConstantVector::isAllOnesValue() const {
927 // Check out first element.
928 const Constant *Elt = getOperand(0);
929 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
930 if (!CI || !CI->isAllOnesValue()) return false;
931 // Then make sure all remaining elements point to the same value.
932 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
933 if (getOperand(I) != Elt) return false;
938 /// getSplatValue - If this is a splat constant, where all of the
939 /// elements have the same value, return that value. Otherwise return null.
940 Constant *ConstantVector::getSplatValue() {
941 // Check out first element.
942 Constant *Elt = getOperand(0);
943 // Then make sure all remaining elements point to the same value.
944 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
945 if (getOperand(I) != Elt) return 0;
949 //---- ConstantPointerNull::get() implementation...
952 static char getValType(ConstantPointerNull *) {
957 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
958 // Implicitly locked.
959 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
962 // destroyConstant - Remove the constant from the constant table...
964 void ConstantPointerNull::destroyConstant() {
965 // Implicitly locked.
966 getType()->getContext().pImpl->NullPtrConstants.remove(this);
967 destroyConstantImpl();
971 //---- UndefValue::get() implementation...
974 static char getValType(UndefValue *) {
978 UndefValue *UndefValue::get(const Type *Ty) {
979 // Implicitly locked.
980 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
983 // destroyConstant - Remove the constant from the constant table.
985 void UndefValue::destroyConstant() {
986 // Implicitly locked.
987 getType()->getContext().pImpl->UndefValueConstants.remove(this);
988 destroyConstantImpl();
991 //---- ConstantExpr::get() implementations...
994 static ExprMapKeyType getValType(ConstantExpr *CE) {
995 std::vector<Constant*> Operands;
996 Operands.reserve(CE->getNumOperands());
997 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
998 Operands.push_back(cast<Constant>(CE->getOperand(i)));
999 return ExprMapKeyType(CE->getOpcode(), Operands,
1000 CE->isCompare() ? CE->getPredicate() : 0,
1002 CE->getIndices() : SmallVector<unsigned, 4>());
1005 /// This is a utility function to handle folding of casts and lookup of the
1006 /// cast in the ExprConstants map. It is used by the various get* methods below.
1007 static inline Constant *getFoldedCast(
1008 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1009 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1010 // Fold a few common cases
1011 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1014 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1016 // Look up the constant in the table first to ensure uniqueness
1017 std::vector<Constant*> argVec(1, C);
1018 ExprMapKeyType Key(opc, argVec);
1020 // Implicitly locked.
1021 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1024 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1025 Instruction::CastOps opc = Instruction::CastOps(oc);
1026 assert(Instruction::isCast(opc) && "opcode out of range");
1027 assert(C && Ty && "Null arguments to getCast");
1028 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1032 llvm_unreachable("Invalid cast opcode");
1034 case Instruction::Trunc: return getTrunc(C, Ty);
1035 case Instruction::ZExt: return getZExt(C, Ty);
1036 case Instruction::SExt: return getSExt(C, Ty);
1037 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1038 case Instruction::FPExt: return getFPExtend(C, Ty);
1039 case Instruction::UIToFP: return getUIToFP(C, Ty);
1040 case Instruction::SIToFP: return getSIToFP(C, Ty);
1041 case Instruction::FPToUI: return getFPToUI(C, Ty);
1042 case Instruction::FPToSI: return getFPToSI(C, Ty);
1043 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1044 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1045 case Instruction::BitCast: return getBitCast(C, Ty);
1050 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1051 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1052 return getCast(Instruction::BitCast, C, Ty);
1053 return getCast(Instruction::ZExt, C, Ty);
1056 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1057 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1058 return getCast(Instruction::BitCast, C, Ty);
1059 return getCast(Instruction::SExt, C, Ty);
1062 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1063 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1064 return getCast(Instruction::BitCast, C, Ty);
1065 return getCast(Instruction::Trunc, C, Ty);
1068 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1069 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1070 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1072 if (Ty->isInteger())
1073 return getCast(Instruction::PtrToInt, S, Ty);
1074 return getCast(Instruction::BitCast, S, Ty);
1077 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1079 assert(C->getType()->isIntOrIntVector() &&
1080 Ty->isIntOrIntVector() && "Invalid cast");
1081 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1082 unsigned DstBits = Ty->getScalarSizeInBits();
1083 Instruction::CastOps opcode =
1084 (SrcBits == DstBits ? Instruction::BitCast :
1085 (SrcBits > DstBits ? Instruction::Trunc :
1086 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1087 return getCast(opcode, C, Ty);
1090 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1091 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1093 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1094 unsigned DstBits = Ty->getScalarSizeInBits();
1095 if (SrcBits == DstBits)
1096 return C; // Avoid a useless cast
1097 Instruction::CastOps opcode =
1098 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1099 return getCast(opcode, C, Ty);
1102 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1104 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1105 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1107 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1108 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1109 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1110 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1111 "SrcTy must be larger than DestTy for Trunc!");
1113 return getFoldedCast(Instruction::Trunc, C, Ty);
1116 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1118 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1119 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1121 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1122 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1123 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1124 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1125 "SrcTy must be smaller than DestTy for SExt!");
1127 return getFoldedCast(Instruction::SExt, C, Ty);
1130 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1132 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1133 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1135 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1136 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1137 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1138 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1139 "SrcTy must be smaller than DestTy for ZExt!");
1141 return getFoldedCast(Instruction::ZExt, C, Ty);
1144 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1146 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1147 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1149 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1150 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1151 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1152 "This is an illegal floating point truncation!");
1153 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1156 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1158 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1159 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1161 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1162 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1163 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1164 "This is an illegal floating point extension!");
1165 return getFoldedCast(Instruction::FPExt, C, Ty);
1168 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1170 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1171 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1173 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1174 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1175 "This is an illegal uint to floating point cast!");
1176 return getFoldedCast(Instruction::UIToFP, C, Ty);
1179 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1181 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1182 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1184 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1185 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1186 "This is an illegal sint to floating point cast!");
1187 return getFoldedCast(Instruction::SIToFP, C, Ty);
1190 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1192 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1193 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1195 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1196 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1197 "This is an illegal floating point to uint cast!");
1198 return getFoldedCast(Instruction::FPToUI, C, Ty);
1201 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1203 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1204 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1206 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1207 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1208 "This is an illegal floating point to sint cast!");
1209 return getFoldedCast(Instruction::FPToSI, C, Ty);
1212 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1213 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1214 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1215 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1218 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1219 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1220 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1221 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1224 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1225 // BitCast implies a no-op cast of type only. No bits change. However, you
1226 // can't cast pointers to anything but pointers.
1228 const Type *SrcTy = C->getType();
1229 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1230 "BitCast cannot cast pointer to non-pointer and vice versa");
1232 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1233 // or nonptr->ptr). For all the other types, the cast is okay if source and
1234 // destination bit widths are identical.
1235 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1236 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1238 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1240 // It is common to ask for a bitcast of a value to its own type, handle this
1242 if (C->getType() == DstTy) return C;
1244 return getFoldedCast(Instruction::BitCast, C, DstTy);
1247 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1248 Constant *C1, Constant *C2) {
1249 // Check the operands for consistency first
1250 assert(Opcode >= Instruction::BinaryOpsBegin &&
1251 Opcode < Instruction::BinaryOpsEnd &&
1252 "Invalid opcode in binary constant expression");
1253 assert(C1->getType() == C2->getType() &&
1254 "Operand types in binary constant expression should match");
1256 if (ReqTy == C1->getType() || ReqTy == Type::Int1Ty)
1257 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1259 return FC; // Fold a few common cases...
1261 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1262 ExprMapKeyType Key(Opcode, argVec);
1264 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1266 // Implicitly locked.
1267 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1270 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1271 Constant *C1, Constant *C2) {
1272 switch (predicate) {
1273 default: llvm_unreachable("Invalid CmpInst predicate");
1274 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1275 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1276 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1277 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1278 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1279 case CmpInst::FCMP_TRUE:
1280 return getFCmp(predicate, C1, C2);
1282 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1283 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1284 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1285 case CmpInst::ICMP_SLE:
1286 return getICmp(predicate, C1, C2);
1290 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
1291 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1292 if (C1->getType()->isFPOrFPVector()) {
1293 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1294 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1295 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1299 case Instruction::Add:
1300 case Instruction::Sub:
1301 case Instruction::Mul:
1302 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1303 assert(C1->getType()->isIntOrIntVector() &&
1304 "Tried to create an integer operation on a non-integer type!");
1306 case Instruction::FAdd:
1307 case Instruction::FSub:
1308 case Instruction::FMul:
1309 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1310 assert(C1->getType()->isFPOrFPVector() &&
1311 "Tried to create a floating-point operation on a "
1312 "non-floating-point type!");
1314 case Instruction::UDiv:
1315 case Instruction::SDiv:
1316 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1317 assert(C1->getType()->isIntOrIntVector() &&
1318 "Tried to create an arithmetic operation on a non-arithmetic type!");
1320 case Instruction::FDiv:
1321 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1322 assert(C1->getType()->isFPOrFPVector() &&
1323 "Tried to create an arithmetic operation on a non-arithmetic type!");
1325 case Instruction::URem:
1326 case Instruction::SRem:
1327 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1328 assert(C1->getType()->isIntOrIntVector() &&
1329 "Tried to create an arithmetic operation on a non-arithmetic type!");
1331 case Instruction::FRem:
1332 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1333 assert(C1->getType()->isFPOrFPVector() &&
1334 "Tried to create an arithmetic operation on a non-arithmetic type!");
1336 case Instruction::And:
1337 case Instruction::Or:
1338 case Instruction::Xor:
1339 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1340 assert(C1->getType()->isIntOrIntVector() &&
1341 "Tried to create a logical operation on a non-integral type!");
1343 case Instruction::Shl:
1344 case Instruction::LShr:
1345 case Instruction::AShr:
1346 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1347 assert(C1->getType()->isIntOrIntVector() &&
1348 "Tried to create a shift operation on a non-integer type!");
1355 return getTy(C1->getType(), Opcode, C1, C2);
1358 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1359 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1360 // Note that a non-inbounds gep is used, as null isn't within any object.
1361 Constant *GEPIdx = ConstantInt::get(Type::Int32Ty, 1);
1362 Constant *GEP = getGetElementPtr(
1363 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1364 return getCast(Instruction::PtrToInt, GEP, Type::Int64Ty);
1367 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1368 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1369 // Note that a non-inbounds gep is used, as null isn't within any object.
1370 const Type *AligningTy = StructType::get(Ty->getContext(),
1371 Type::Int8Ty, Ty, NULL);
1372 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1373 Constant *Zero = ConstantInt::get(Type::Int32Ty, 0);
1374 Constant *One = ConstantInt::get(Type::Int32Ty, 1);
1375 Constant *Indices[2] = { Zero, One };
1376 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1377 return getCast(Instruction::PtrToInt, GEP, Type::Int32Ty);
1381 Constant *ConstantExpr::getCompare(unsigned short pred,
1382 Constant *C1, Constant *C2) {
1383 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1384 return getCompareTy(pred, C1, C2);
1387 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1388 Constant *V1, Constant *V2) {
1389 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1391 if (ReqTy == V1->getType())
1392 if (Constant *SC = ConstantFoldSelectInstruction(
1393 ReqTy->getContext(), C, V1, V2))
1394 return SC; // Fold common cases
1396 std::vector<Constant*> argVec(3, C);
1399 ExprMapKeyType Key(Instruction::Select, argVec);
1401 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1403 // Implicitly locked.
1404 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1407 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1410 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1412 cast<PointerType>(ReqTy)->getElementType() &&
1413 "GEP indices invalid!");
1415 if (Constant *FC = ConstantFoldGetElementPtr(
1416 ReqTy->getContext(), C, (Constant**)Idxs, NumIdx))
1417 return FC; // Fold a few common cases...
1419 assert(isa<PointerType>(C->getType()) &&
1420 "Non-pointer type for constant GetElementPtr expression");
1421 // Look up the constant in the table first to ensure uniqueness
1422 std::vector<Constant*> ArgVec;
1423 ArgVec.reserve(NumIdx+1);
1424 ArgVec.push_back(C);
1425 for (unsigned i = 0; i != NumIdx; ++i)
1426 ArgVec.push_back(cast<Constant>(Idxs[i]));
1427 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1429 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1431 // Implicitly locked.
1432 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1435 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1437 // Get the result type of the getelementptr!
1439 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1440 assert(Ty && "GEP indices invalid!");
1441 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1442 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1445 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1448 Constant *Result = getGetElementPtr(C, Idxs, NumIdx);
1449 // Set in bounds attribute, assuming constant folding didn't eliminate the
1451 if (GEPOperator *GEP = dyn_cast<GEPOperator>(Result))
1452 GEP->setIsInBounds(true);
1456 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1458 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1461 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1462 Constant* const *Idxs,
1464 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1468 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1469 assert(LHS->getType() == RHS->getType());
1470 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1471 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1473 if (Constant *FC = ConstantFoldCompareInstruction(
1474 LHS->getContext(), pred, LHS, RHS))
1475 return FC; // Fold a few common cases...
1477 // Look up the constant in the table first to ensure uniqueness
1478 std::vector<Constant*> ArgVec;
1479 ArgVec.push_back(LHS);
1480 ArgVec.push_back(RHS);
1481 // Get the key type with both the opcode and predicate
1482 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1484 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1486 // Implicitly locked.
1487 return pImpl->ExprConstants.getOrCreate(Type::Int1Ty, Key);
1491 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1492 assert(LHS->getType() == RHS->getType());
1493 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1495 if (Constant *FC = ConstantFoldCompareInstruction(
1496 LHS->getContext(), pred, LHS, RHS))
1497 return FC; // Fold a few common cases...
1499 // Look up the constant in the table first to ensure uniqueness
1500 std::vector<Constant*> ArgVec;
1501 ArgVec.push_back(LHS);
1502 ArgVec.push_back(RHS);
1503 // Get the key type with both the opcode and predicate
1504 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1506 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1508 // Implicitly locked.
1509 return pImpl->ExprConstants.getOrCreate(Type::Int1Ty, Key);
1512 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1514 if (Constant *FC = ConstantFoldExtractElementInstruction(
1515 ReqTy->getContext(), Val, Idx))
1516 return FC; // Fold a few common cases...
1517 // Look up the constant in the table first to ensure uniqueness
1518 std::vector<Constant*> ArgVec(1, Val);
1519 ArgVec.push_back(Idx);
1520 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1522 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1524 // Implicitly locked.
1525 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1528 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1529 assert(isa<VectorType>(Val->getType()) &&
1530 "Tried to create extractelement operation on non-vector type!");
1531 assert(Idx->getType() == Type::Int32Ty &&
1532 "Extractelement index must be i32 type!");
1533 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1537 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1538 Constant *Elt, Constant *Idx) {
1539 if (Constant *FC = ConstantFoldInsertElementInstruction(
1540 ReqTy->getContext(), Val, Elt, Idx))
1541 return FC; // Fold a few common cases...
1542 // Look up the constant in the table first to ensure uniqueness
1543 std::vector<Constant*> ArgVec(1, Val);
1544 ArgVec.push_back(Elt);
1545 ArgVec.push_back(Idx);
1546 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1548 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1550 // Implicitly locked.
1551 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1554 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1556 assert(isa<VectorType>(Val->getType()) &&
1557 "Tried to create insertelement operation on non-vector type!");
1558 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1559 && "Insertelement types must match!");
1560 assert(Idx->getType() == Type::Int32Ty &&
1561 "Insertelement index must be i32 type!");
1562 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1565 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1566 Constant *V2, Constant *Mask) {
1567 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1568 ReqTy->getContext(), V1, V2, Mask))
1569 return FC; // Fold a few common cases...
1570 // Look up the constant in the table first to ensure uniqueness
1571 std::vector<Constant*> ArgVec(1, V1);
1572 ArgVec.push_back(V2);
1573 ArgVec.push_back(Mask);
1574 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1576 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1578 // Implicitly locked.
1579 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1582 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1584 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1585 "Invalid shuffle vector constant expr operands!");
1587 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1588 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1589 const Type *ShufTy = VectorType::get(EltTy, NElts);
1590 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1593 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1595 const unsigned *Idxs, unsigned NumIdx) {
1596 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1597 Idxs+NumIdx) == Val->getType() &&
1598 "insertvalue indices invalid!");
1599 assert(Agg->getType() == ReqTy &&
1600 "insertvalue type invalid!");
1601 assert(Agg->getType()->isFirstClassType() &&
1602 "Non-first-class type for constant InsertValue expression");
1603 Constant *FC = ConstantFoldInsertValueInstruction(
1604 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1605 assert(FC && "InsertValue constant expr couldn't be folded!");
1609 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1610 const unsigned *IdxList, unsigned NumIdx) {
1611 assert(Agg->getType()->isFirstClassType() &&
1612 "Tried to create insertelement operation on non-first-class type!");
1614 const Type *ReqTy = Agg->getType();
1617 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1619 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1620 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1623 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1624 const unsigned *Idxs, unsigned NumIdx) {
1625 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1626 Idxs+NumIdx) == ReqTy &&
1627 "extractvalue indices invalid!");
1628 assert(Agg->getType()->isFirstClassType() &&
1629 "Non-first-class type for constant extractvalue expression");
1630 Constant *FC = ConstantFoldExtractValueInstruction(
1631 ReqTy->getContext(), Agg, Idxs, NumIdx);
1632 assert(FC && "ExtractValue constant expr couldn't be folded!");
1636 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1637 const unsigned *IdxList, unsigned NumIdx) {
1638 assert(Agg->getType()->isFirstClassType() &&
1639 "Tried to create extractelement operation on non-first-class type!");
1642 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1643 assert(ReqTy && "extractvalue indices invalid!");
1644 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1647 Constant* ConstantExpr::getNeg(Constant* C) {
1648 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1649 if (C->getType()->isFPOrFPVector())
1651 assert(C->getType()->isIntOrIntVector() &&
1652 "Cannot NEG a nonintegral value!");
1653 return get(Instruction::Sub,
1654 ConstantFP::getZeroValueForNegation(C->getType()),
1658 Constant* ConstantExpr::getFNeg(Constant* C) {
1659 assert(C->getType()->isFPOrFPVector() &&
1660 "Cannot FNEG a non-floating-point value!");
1661 return get(Instruction::FSub,
1662 ConstantFP::getZeroValueForNegation(C->getType()),
1666 Constant* ConstantExpr::getNot(Constant* C) {
1667 assert(C->getType()->isIntOrIntVector() &&
1668 "Cannot NOT a nonintegral value!");
1669 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1672 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1673 return get(Instruction::Add, C1, C2);
1676 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1677 return get(Instruction::FAdd, C1, C2);
1680 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1681 return get(Instruction::Sub, C1, C2);
1684 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1685 return get(Instruction::FSub, C1, C2);
1688 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1689 return get(Instruction::Mul, C1, C2);
1692 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1693 return get(Instruction::FMul, C1, C2);
1696 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1697 return get(Instruction::UDiv, C1, C2);
1700 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1701 return get(Instruction::SDiv, C1, C2);
1704 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1705 return get(Instruction::FDiv, C1, C2);
1708 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1709 return get(Instruction::URem, C1, C2);
1712 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1713 return get(Instruction::SRem, C1, C2);
1716 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1717 return get(Instruction::FRem, C1, C2);
1720 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1721 return get(Instruction::And, C1, C2);
1724 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1725 return get(Instruction::Or, C1, C2);
1728 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1729 return get(Instruction::Xor, C1, C2);
1732 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1733 return get(Instruction::Shl, C1, C2);
1736 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1737 return get(Instruction::LShr, C1, C2);
1740 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1741 return get(Instruction::AShr, C1, C2);
1744 // destroyConstant - Remove the constant from the constant table...
1746 void ConstantExpr::destroyConstant() {
1747 // Implicitly locked.
1748 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1749 pImpl->ExprConstants.remove(this);
1750 destroyConstantImpl();
1753 const char *ConstantExpr::getOpcodeName() const {
1754 return Instruction::getOpcodeName(getOpcode());
1757 //===----------------------------------------------------------------------===//
1758 // replaceUsesOfWithOnConstant implementations
1760 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1761 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1764 /// Note that we intentionally replace all uses of From with To here. Consider
1765 /// a large array that uses 'From' 1000 times. By handling this case all here,
1766 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1767 /// single invocation handles all 1000 uses. Handling them one at a time would
1768 /// work, but would be really slow because it would have to unique each updated
1771 static std::vector<Constant*> getValType(ConstantArray *CA) {
1772 std::vector<Constant*> Elements;
1773 Elements.reserve(CA->getNumOperands());
1774 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1775 Elements.push_back(cast<Constant>(CA->getOperand(i)));
1780 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1782 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1783 Constant *ToC = cast<Constant>(To);
1785 LLVMContext &Context = getType()->getContext();
1786 LLVMContextImpl *pImpl = Context.pImpl;
1788 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, Constant*> Lookup;
1789 Lookup.first.first = getType();
1790 Lookup.second = this;
1792 std::vector<Constant*> &Values = Lookup.first.second;
1793 Values.reserve(getNumOperands()); // Build replacement array.
1795 // Fill values with the modified operands of the constant array. Also,
1796 // compute whether this turns into an all-zeros array.
1797 bool isAllZeros = false;
1798 unsigned NumUpdated = 0;
1799 if (!ToC->isNullValue()) {
1800 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1801 Constant *Val = cast<Constant>(O->get());
1806 Values.push_back(Val);
1810 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1811 Constant *Val = cast<Constant>(O->get());
1816 Values.push_back(Val);
1817 if (isAllZeros) isAllZeros = Val->isNullValue();
1821 Constant *Replacement = 0;
1823 Replacement = ConstantAggregateZero::get(getType());
1825 // Check to see if we have this array type already.
1826 sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
1828 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1829 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1832 Replacement = cast<Constant>(I->second);
1834 // Okay, the new shape doesn't exist in the system yet. Instead of
1835 // creating a new constant array, inserting it, replaceallusesof'ing the
1836 // old with the new, then deleting the old... just update the current one
1838 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1840 // Update to the new value. Optimize for the case when we have a single
1841 // operand that we're changing, but handle bulk updates efficiently.
1842 if (NumUpdated == 1) {
1843 unsigned OperandToUpdate = U - OperandList;
1844 assert(getOperand(OperandToUpdate) == From &&
1845 "ReplaceAllUsesWith broken!");
1846 setOperand(OperandToUpdate, ToC);
1848 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1849 if (getOperand(i) == From)
1856 // Otherwise, I do need to replace this with an existing value.
1857 assert(Replacement != this && "I didn't contain From!");
1859 // Everyone using this now uses the replacement.
1860 uncheckedReplaceAllUsesWith(Replacement);
1862 // Delete the old constant!
1866 static std::vector<Constant*> getValType(ConstantStruct *CS) {
1867 std::vector<Constant*> Elements;
1868 Elements.reserve(CS->getNumOperands());
1869 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i)
1870 Elements.push_back(cast<Constant>(CS->getOperand(i)));
1874 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
1876 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1877 Constant *ToC = cast<Constant>(To);
1879 unsigned OperandToUpdate = U-OperandList;
1880 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
1882 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, Constant*> Lookup;
1883 Lookup.first.first = getType();
1884 Lookup.second = this;
1885 std::vector<Constant*> &Values = Lookup.first.second;
1886 Values.reserve(getNumOperands()); // Build replacement struct.
1889 // Fill values with the modified operands of the constant struct. Also,
1890 // compute whether this turns into an all-zeros struct.
1891 bool isAllZeros = false;
1892 if (!ToC->isNullValue()) {
1893 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
1894 Values.push_back(cast<Constant>(O->get()));
1897 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1898 Constant *Val = cast<Constant>(O->get());
1899 Values.push_back(Val);
1900 if (isAllZeros) isAllZeros = Val->isNullValue();
1903 Values[OperandToUpdate] = ToC;
1905 LLVMContext &Context = getType()->getContext();
1906 LLVMContextImpl *pImpl = Context.pImpl;
1908 Constant *Replacement = 0;
1910 Replacement = ConstantAggregateZero::get(getType());
1912 // Check to see if we have this array type already.
1913 sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
1915 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
1916 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
1919 Replacement = cast<Constant>(I->second);
1921 // Okay, the new shape doesn't exist in the system yet. Instead of
1922 // creating a new constant struct, inserting it, replaceallusesof'ing the
1923 // old with the new, then deleting the old... just update the current one
1925 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
1927 // Update to the new value.
1928 setOperand(OperandToUpdate, ToC);
1933 assert(Replacement != this && "I didn't contain From!");
1935 // Everyone using this now uses the replacement.
1936 uncheckedReplaceAllUsesWith(Replacement);
1938 // Delete the old constant!
1942 static std::vector<Constant*> getValType(ConstantVector *CP) {
1943 std::vector<Constant*> Elements;
1944 Elements.reserve(CP->getNumOperands());
1945 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
1946 Elements.push_back(CP->getOperand(i));
1950 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
1952 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1954 std::vector<Constant*> Values;
1955 Values.reserve(getNumOperands()); // Build replacement array...
1956 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1957 Constant *Val = getOperand(i);
1958 if (Val == From) Val = cast<Constant>(To);
1959 Values.push_back(Val);
1962 Constant *Replacement = get(getType(), Values);
1963 assert(Replacement != this && "I didn't contain From!");
1965 // Everyone using this now uses the replacement.
1966 uncheckedReplaceAllUsesWith(Replacement);
1968 // Delete the old constant!
1972 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
1974 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
1975 Constant *To = cast<Constant>(ToV);
1977 Constant *Replacement = 0;
1978 if (getOpcode() == Instruction::GetElementPtr) {
1979 SmallVector<Constant*, 8> Indices;
1980 Constant *Pointer = getOperand(0);
1981 Indices.reserve(getNumOperands()-1);
1982 if (Pointer == From) Pointer = To;
1984 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
1985 Constant *Val = getOperand(i);
1986 if (Val == From) Val = To;
1987 Indices.push_back(Val);
1989 Replacement = ConstantExpr::getGetElementPtr(Pointer,
1990 &Indices[0], Indices.size());
1991 } else if (getOpcode() == Instruction::ExtractValue) {
1992 Constant *Agg = getOperand(0);
1993 if (Agg == From) Agg = To;
1995 const SmallVector<unsigned, 4> &Indices = getIndices();
1996 Replacement = ConstantExpr::getExtractValue(Agg,
1997 &Indices[0], Indices.size());
1998 } else if (getOpcode() == Instruction::InsertValue) {
1999 Constant *Agg = getOperand(0);
2000 Constant *Val = getOperand(1);
2001 if (Agg == From) Agg = To;
2002 if (Val == From) Val = To;
2004 const SmallVector<unsigned, 4> &Indices = getIndices();
2005 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2006 &Indices[0], Indices.size());
2007 } else if (isCast()) {
2008 assert(getOperand(0) == From && "Cast only has one use!");
2009 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2010 } else if (getOpcode() == Instruction::Select) {
2011 Constant *C1 = getOperand(0);
2012 Constant *C2 = getOperand(1);
2013 Constant *C3 = getOperand(2);
2014 if (C1 == From) C1 = To;
2015 if (C2 == From) C2 = To;
2016 if (C3 == From) C3 = To;
2017 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2018 } else if (getOpcode() == Instruction::ExtractElement) {
2019 Constant *C1 = getOperand(0);
2020 Constant *C2 = getOperand(1);
2021 if (C1 == From) C1 = To;
2022 if (C2 == From) C2 = To;
2023 Replacement = ConstantExpr::getExtractElement(C1, C2);
2024 } else if (getOpcode() == Instruction::InsertElement) {
2025 Constant *C1 = getOperand(0);
2026 Constant *C2 = getOperand(1);
2027 Constant *C3 = getOperand(1);
2028 if (C1 == From) C1 = To;
2029 if (C2 == From) C2 = To;
2030 if (C3 == From) C3 = To;
2031 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2032 } else if (getOpcode() == Instruction::ShuffleVector) {
2033 Constant *C1 = getOperand(0);
2034 Constant *C2 = getOperand(1);
2035 Constant *C3 = getOperand(2);
2036 if (C1 == From) C1 = To;
2037 if (C2 == From) C2 = To;
2038 if (C3 == From) C3 = To;
2039 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2040 } else if (isCompare()) {
2041 Constant *C1 = getOperand(0);
2042 Constant *C2 = getOperand(1);
2043 if (C1 == From) C1 = To;
2044 if (C2 == From) C2 = To;
2045 if (getOpcode() == Instruction::ICmp)
2046 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2048 assert(getOpcode() == Instruction::FCmp);
2049 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2051 } else if (getNumOperands() == 2) {
2052 Constant *C1 = getOperand(0);
2053 Constant *C2 = getOperand(1);
2054 if (C1 == From) C1 = To;
2055 if (C2 == From) C2 = To;
2056 Replacement = ConstantExpr::get(getOpcode(), C1, C2);
2058 llvm_unreachable("Unknown ConstantExpr type!");
2062 assert(Replacement != this && "I didn't contain From!");
2064 // Everyone using this now uses the replacement.
2065 uncheckedReplaceAllUsesWith(Replacement);
2067 // Delete the old constant!