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(const std::vector<Constant*>& V, bool packed) {
536 std::vector<const Type*> StructEls;
537 StructEls.reserve(V.size());
538 for (unsigned i = 0, e = V.size(); i != e; ++i)
539 StructEls.push_back(V[i]->getType());
540 return get(StructType::get(StructEls, packed), V);
543 Constant* ConstantStruct::get(Constant* const *Vals, unsigned NumVals,
545 // FIXME: make this the primary ctor method.
546 return get(std::vector<Constant*>(Vals, Vals+NumVals), Packed);
549 ConstantVector::ConstantVector(const VectorType *T,
550 const std::vector<Constant*> &V)
551 : Constant(T, ConstantVectorVal,
552 OperandTraits<ConstantVector>::op_end(this) - V.size(),
554 Use *OL = OperandList;
555 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
558 assert((C->getType() == T->getElementType() ||
560 C->getType()->getTypeID() == T->getElementType()->getTypeID())) &&
561 "Initializer for vector element doesn't match vector element type!");
566 // ConstantVector accessors.
567 Constant* ConstantVector::get(const VectorType* T,
568 const std::vector<Constant*>& V) {
569 assert(!V.empty() && "Vectors can't be empty");
570 LLVMContext &Context = T->getContext();
571 LLVMContextImpl *pImpl = Context.pImpl;
573 // If this is an all-undef or alll-zero vector, return a
574 // ConstantAggregateZero or UndefValue.
576 bool isZero = C->isNullValue();
577 bool isUndef = isa<UndefValue>(C);
579 if (isZero || isUndef) {
580 for (unsigned i = 1, e = V.size(); i != e; ++i)
582 isZero = isUndef = false;
588 return ConstantAggregateZero::get(T);
590 return UndefValue::get(T);
592 // Implicitly locked.
593 return pImpl->VectorConstants.getOrCreate(T, V);
596 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
597 assert(!V.empty() && "Cannot infer type if V is empty");
598 return get(VectorType::get(V.front()->getType(),V.size()), V);
601 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
602 // FIXME: make this the primary ctor method.
603 return get(std::vector<Constant*>(Vals, Vals+NumVals));
608 // We declare several classes private to this file, so use an anonymous
612 /// UnaryConstantExpr - This class is private to Constants.cpp, and is used
613 /// behind the scenes to implement unary constant exprs.
614 class VISIBILITY_HIDDEN UnaryConstantExpr : public ConstantExpr {
615 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
617 // allocate space for exactly one operand
618 void *operator new(size_t s) {
619 return User::operator new(s, 1);
621 UnaryConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
622 : ConstantExpr(Ty, Opcode, &Op<0>(), 1) {
625 /// Transparently provide more efficient getOperand methods.
626 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
629 /// BinaryConstantExpr - This class is private to Constants.cpp, and is used
630 /// behind the scenes to implement binary constant exprs.
631 class VISIBILITY_HIDDEN BinaryConstantExpr : public ConstantExpr {
632 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
634 // allocate space for exactly two operands
635 void *operator new(size_t s) {
636 return User::operator new(s, 2);
638 BinaryConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
639 : ConstantExpr(C1->getType(), Opcode, &Op<0>(), 2) {
643 /// Transparently provide more efficient getOperand methods.
644 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
647 /// SelectConstantExpr - This class is private to Constants.cpp, and is used
648 /// behind the scenes to implement select constant exprs.
649 class VISIBILITY_HIDDEN SelectConstantExpr : public ConstantExpr {
650 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
652 // allocate space for exactly three operands
653 void *operator new(size_t s) {
654 return User::operator new(s, 3);
656 SelectConstantExpr(Constant *C1, Constant *C2, Constant *C3)
657 : ConstantExpr(C2->getType(), Instruction::Select, &Op<0>(), 3) {
662 /// Transparently provide more efficient getOperand methods.
663 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
666 /// ExtractElementConstantExpr - This class is private to
667 /// Constants.cpp, and is used behind the scenes to implement
668 /// extractelement constant exprs.
669 class VISIBILITY_HIDDEN ExtractElementConstantExpr : public ConstantExpr {
670 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
672 // allocate space for exactly two operands
673 void *operator new(size_t s) {
674 return User::operator new(s, 2);
676 ExtractElementConstantExpr(Constant *C1, Constant *C2)
677 : ConstantExpr(cast<VectorType>(C1->getType())->getElementType(),
678 Instruction::ExtractElement, &Op<0>(), 2) {
682 /// Transparently provide more efficient getOperand methods.
683 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
686 /// InsertElementConstantExpr - This class is private to
687 /// Constants.cpp, and is used behind the scenes to implement
688 /// insertelement constant exprs.
689 class VISIBILITY_HIDDEN InsertElementConstantExpr : public ConstantExpr {
690 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
692 // allocate space for exactly three operands
693 void *operator new(size_t s) {
694 return User::operator new(s, 3);
696 InsertElementConstantExpr(Constant *C1, Constant *C2, Constant *C3)
697 : ConstantExpr(C1->getType(), Instruction::InsertElement,
703 /// Transparently provide more efficient getOperand methods.
704 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
707 /// ShuffleVectorConstantExpr - This class is private to
708 /// Constants.cpp, and is used behind the scenes to implement
709 /// shufflevector constant exprs.
710 class VISIBILITY_HIDDEN ShuffleVectorConstantExpr : public ConstantExpr {
711 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
713 // allocate space for exactly three operands
714 void *operator new(size_t s) {
715 return User::operator new(s, 3);
717 ShuffleVectorConstantExpr(Constant *C1, Constant *C2, Constant *C3)
718 : ConstantExpr(VectorType::get(
719 cast<VectorType>(C1->getType())->getElementType(),
720 cast<VectorType>(C3->getType())->getNumElements()),
721 Instruction::ShuffleVector,
727 /// Transparently provide more efficient getOperand methods.
728 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
731 /// ExtractValueConstantExpr - This class is private to
732 /// Constants.cpp, and is used behind the scenes to implement
733 /// extractvalue constant exprs.
734 class VISIBILITY_HIDDEN ExtractValueConstantExpr : public ConstantExpr {
735 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
737 // allocate space for exactly one operand
738 void *operator new(size_t s) {
739 return User::operator new(s, 1);
741 ExtractValueConstantExpr(Constant *Agg,
742 const SmallVector<unsigned, 4> &IdxList,
744 : ConstantExpr(DestTy, Instruction::ExtractValue, &Op<0>(), 1),
749 /// Indices - These identify which value to extract.
750 const SmallVector<unsigned, 4> Indices;
752 /// Transparently provide more efficient getOperand methods.
753 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
756 /// InsertValueConstantExpr - This class is private to
757 /// Constants.cpp, and is used behind the scenes to implement
758 /// insertvalue constant exprs.
759 class VISIBILITY_HIDDEN InsertValueConstantExpr : public ConstantExpr {
760 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
762 // allocate space for exactly one operand
763 void *operator new(size_t s) {
764 return User::operator new(s, 2);
766 InsertValueConstantExpr(Constant *Agg, Constant *Val,
767 const SmallVector<unsigned, 4> &IdxList,
769 : ConstantExpr(DestTy, Instruction::InsertValue, &Op<0>(), 2),
775 /// Indices - These identify the position for the insertion.
776 const SmallVector<unsigned, 4> Indices;
778 /// Transparently provide more efficient getOperand methods.
779 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
783 /// GetElementPtrConstantExpr - This class is private to Constants.cpp, and is
784 /// used behind the scenes to implement getelementpr constant exprs.
785 class VISIBILITY_HIDDEN GetElementPtrConstantExpr : public ConstantExpr {
786 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
789 static GetElementPtrConstantExpr *Create(Constant *C,
790 const std::vector<Constant*>&IdxList,
791 const Type *DestTy) {
793 new(IdxList.size() + 1) GetElementPtrConstantExpr(C, IdxList, DestTy);
795 /// Transparently provide more efficient getOperand methods.
796 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
799 // CompareConstantExpr - This class is private to Constants.cpp, and is used
800 // behind the scenes to implement ICmp and FCmp constant expressions. This is
801 // needed in order to store the predicate value for these instructions.
802 struct VISIBILITY_HIDDEN CompareConstantExpr : public ConstantExpr {
803 void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
804 // allocate space for exactly two operands
805 void *operator new(size_t s) {
806 return User::operator new(s, 2);
808 unsigned short predicate;
809 CompareConstantExpr(const Type *ty, Instruction::OtherOps opc,
810 unsigned short pred, Constant* LHS, Constant* RHS)
811 : ConstantExpr(ty, opc, &Op<0>(), 2), predicate(pred) {
815 /// Transparently provide more efficient getOperand methods.
816 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
819 } // end anonymous namespace
822 struct OperandTraits<UnaryConstantExpr> : FixedNumOperandTraits<1> {
824 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(UnaryConstantExpr, Value)
827 struct OperandTraits<BinaryConstantExpr> : FixedNumOperandTraits<2> {
829 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(BinaryConstantExpr, Value)
832 struct OperandTraits<SelectConstantExpr> : FixedNumOperandTraits<3> {
834 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(SelectConstantExpr, Value)
837 struct OperandTraits<ExtractElementConstantExpr> : FixedNumOperandTraits<2> {
839 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ExtractElementConstantExpr, Value)
842 struct OperandTraits<InsertElementConstantExpr> : FixedNumOperandTraits<3> {
844 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(InsertElementConstantExpr, Value)
847 struct OperandTraits<ShuffleVectorConstantExpr> : FixedNumOperandTraits<3> {
849 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ShuffleVectorConstantExpr, Value)
852 struct OperandTraits<ExtractValueConstantExpr> : FixedNumOperandTraits<1> {
854 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ExtractValueConstantExpr, Value)
857 struct OperandTraits<InsertValueConstantExpr> : FixedNumOperandTraits<2> {
859 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(InsertValueConstantExpr, Value)
862 struct OperandTraits<GetElementPtrConstantExpr> : VariadicOperandTraits<1> {
865 GetElementPtrConstantExpr::GetElementPtrConstantExpr
867 const std::vector<Constant*> &IdxList,
869 : ConstantExpr(DestTy, Instruction::GetElementPtr,
870 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
871 - (IdxList.size()+1),
874 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
875 OperandList[i+1] = IdxList[i];
878 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GetElementPtrConstantExpr, Value)
882 struct OperandTraits<CompareConstantExpr> : FixedNumOperandTraits<2> {
884 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CompareConstantExpr, Value)
887 } // End llvm namespace
890 // Utility function for determining if a ConstantExpr is a CastOp or not. This
891 // can't be inline because we don't want to #include Instruction.h into
893 bool ConstantExpr::isCast() const {
894 return Instruction::isCast(getOpcode());
897 bool ConstantExpr::isCompare() const {
898 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
901 bool ConstantExpr::hasIndices() const {
902 return getOpcode() == Instruction::ExtractValue ||
903 getOpcode() == Instruction::InsertValue;
906 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
907 if (const ExtractValueConstantExpr *EVCE =
908 dyn_cast<ExtractValueConstantExpr>(this))
909 return EVCE->Indices;
911 return cast<InsertValueConstantExpr>(this)->Indices;
914 unsigned ConstantExpr::getPredicate() const {
915 assert(getOpcode() == Instruction::FCmp ||
916 getOpcode() == Instruction::ICmp);
917 return ((const CompareConstantExpr*)this)->predicate;
920 /// getWithOperandReplaced - Return a constant expression identical to this
921 /// one, but with the specified operand set to the specified value.
923 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
924 assert(OpNo < getNumOperands() && "Operand num is out of range!");
925 assert(Op->getType() == getOperand(OpNo)->getType() &&
926 "Replacing operand with value of different type!");
927 if (getOperand(OpNo) == Op)
928 return const_cast<ConstantExpr*>(this);
930 Constant *Op0, *Op1, *Op2;
931 switch (getOpcode()) {
932 case Instruction::Trunc:
933 case Instruction::ZExt:
934 case Instruction::SExt:
935 case Instruction::FPTrunc:
936 case Instruction::FPExt:
937 case Instruction::UIToFP:
938 case Instruction::SIToFP:
939 case Instruction::FPToUI:
940 case Instruction::FPToSI:
941 case Instruction::PtrToInt:
942 case Instruction::IntToPtr:
943 case Instruction::BitCast:
944 return ConstantExpr::getCast(getOpcode(), Op, getType());
945 case Instruction::Select:
946 Op0 = (OpNo == 0) ? Op : getOperand(0);
947 Op1 = (OpNo == 1) ? Op : getOperand(1);
948 Op2 = (OpNo == 2) ? Op : getOperand(2);
949 return ConstantExpr::getSelect(Op0, Op1, Op2);
950 case Instruction::InsertElement:
951 Op0 = (OpNo == 0) ? Op : getOperand(0);
952 Op1 = (OpNo == 1) ? Op : getOperand(1);
953 Op2 = (OpNo == 2) ? Op : getOperand(2);
954 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
955 case Instruction::ExtractElement:
956 Op0 = (OpNo == 0) ? Op : getOperand(0);
957 Op1 = (OpNo == 1) ? Op : getOperand(1);
958 return ConstantExpr::getExtractElement(Op0, Op1);
959 case Instruction::ShuffleVector:
960 Op0 = (OpNo == 0) ? Op : getOperand(0);
961 Op1 = (OpNo == 1) ? Op : getOperand(1);
962 Op2 = (OpNo == 2) ? Op : getOperand(2);
963 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
964 case Instruction::GetElementPtr: {
965 SmallVector<Constant*, 8> Ops;
966 Ops.resize(getNumOperands()-1);
967 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
968 Ops[i-1] = getOperand(i);
970 return ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
972 return ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
975 assert(getNumOperands() == 2 && "Must be binary operator?");
976 Op0 = (OpNo == 0) ? Op : getOperand(0);
977 Op1 = (OpNo == 1) ? Op : getOperand(1);
978 return ConstantExpr::get(getOpcode(), Op0, Op1);
982 /// getWithOperands - This returns the current constant expression with the
983 /// operands replaced with the specified values. The specified operands must
984 /// match count and type with the existing ones.
985 Constant *ConstantExpr::
986 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
987 assert(NumOps == getNumOperands() && "Operand count mismatch!");
988 bool AnyChange = false;
989 for (unsigned i = 0; i != NumOps; ++i) {
990 assert(Ops[i]->getType() == getOperand(i)->getType() &&
991 "Operand type mismatch!");
992 AnyChange |= Ops[i] != getOperand(i);
994 if (!AnyChange) // No operands changed, return self.
995 return const_cast<ConstantExpr*>(this);
997 switch (getOpcode()) {
998 case Instruction::Trunc:
999 case Instruction::ZExt:
1000 case Instruction::SExt:
1001 case Instruction::FPTrunc:
1002 case Instruction::FPExt:
1003 case Instruction::UIToFP:
1004 case Instruction::SIToFP:
1005 case Instruction::FPToUI:
1006 case Instruction::FPToSI:
1007 case Instruction::PtrToInt:
1008 case Instruction::IntToPtr:
1009 case Instruction::BitCast:
1010 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
1011 case Instruction::Select:
1012 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
1013 case Instruction::InsertElement:
1014 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1015 case Instruction::ExtractElement:
1016 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1017 case Instruction::ShuffleVector:
1018 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1019 case Instruction::GetElementPtr:
1020 return ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
1021 case Instruction::ICmp:
1022 case Instruction::FCmp:
1023 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1025 assert(getNumOperands() == 2 && "Must be binary operator?");
1026 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1]);
1031 //===----------------------------------------------------------------------===//
1032 // isValueValidForType implementations
1034 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
1035 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1036 if (Ty == Type::Int1Ty)
1037 return Val == 0 || Val == 1;
1039 return true; // always true, has to fit in largest type
1040 uint64_t Max = (1ll << NumBits) - 1;
1044 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
1045 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
1046 if (Ty == Type::Int1Ty)
1047 return Val == 0 || Val == 1 || Val == -1;
1049 return true; // always true, has to fit in largest type
1050 int64_t Min = -(1ll << (NumBits-1));
1051 int64_t Max = (1ll << (NumBits-1)) - 1;
1052 return (Val >= Min && Val <= Max);
1055 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
1056 // convert modifies in place, so make a copy.
1057 APFloat Val2 = APFloat(Val);
1059 switch (Ty->getTypeID()) {
1061 return false; // These can't be represented as floating point!
1063 // FIXME rounding mode needs to be more flexible
1064 case Type::FloatTyID: {
1065 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1067 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1070 case Type::DoubleTyID: {
1071 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
1072 &Val2.getSemantics() == &APFloat::IEEEdouble)
1074 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1077 case Type::X86_FP80TyID:
1078 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
1079 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1080 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1081 case Type::FP128TyID:
1082 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
1083 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1084 &Val2.getSemantics() == &APFloat::IEEEquad;
1085 case Type::PPC_FP128TyID:
1086 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
1087 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1088 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1092 //===----------------------------------------------------------------------===//
1093 // Factory Function Implementation
1095 static char getValType(ConstantAggregateZero *CPZ) { return 0; }
1097 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
1098 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
1099 "Cannot create an aggregate zero of non-aggregate type!");
1101 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1102 // Implicitly locked.
1103 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
1106 /// destroyConstant - Remove the constant from the constant table...
1108 void ConstantAggregateZero::destroyConstant() {
1109 // Implicitly locked.
1110 getType()->getContext().pImpl->AggZeroConstants.remove(this);
1111 destroyConstantImpl();
1114 /// destroyConstant - Remove the constant from the constant table...
1116 void ConstantArray::destroyConstant() {
1117 // Implicitly locked.
1118 getType()->getContext().pImpl->ArrayConstants.remove(this);
1119 destroyConstantImpl();
1122 /// isString - This method returns true if the array is an array of i8, and
1123 /// if the elements of the array are all ConstantInt's.
1124 bool ConstantArray::isString() const {
1125 // Check the element type for i8...
1126 if (getType()->getElementType() != Type::Int8Ty)
1128 // Check the elements to make sure they are all integers, not constant
1130 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1131 if (!isa<ConstantInt>(getOperand(i)))
1136 /// isCString - This method returns true if the array is a string (see
1137 /// isString) and it ends in a null byte \\0 and does not contains any other
1138 /// null bytes except its terminator.
1139 bool ConstantArray::isCString() const {
1140 // Check the element type for i8...
1141 if (getType()->getElementType() != Type::Int8Ty)
1144 // Last element must be a null.
1145 if (!getOperand(getNumOperands()-1)->isNullValue())
1147 // Other elements must be non-null integers.
1148 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1149 if (!isa<ConstantInt>(getOperand(i)))
1151 if (getOperand(i)->isNullValue())
1158 /// getAsString - If the sub-element type of this array is i8
1159 /// then this method converts the array to an std::string and returns it.
1160 /// Otherwise, it asserts out.
1162 std::string ConstantArray::getAsString() const {
1163 assert(isString() && "Not a string!");
1165 Result.reserve(getNumOperands());
1166 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1167 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
1172 //---- ConstantStruct::get() implementation...
1179 // destroyConstant - Remove the constant from the constant table...
1181 void ConstantStruct::destroyConstant() {
1182 // Implicitly locked.
1183 getType()->getContext().pImpl->StructConstants.remove(this);
1184 destroyConstantImpl();
1187 // destroyConstant - Remove the constant from the constant table...
1189 void ConstantVector::destroyConstant() {
1190 // Implicitly locked.
1191 getType()->getContext().pImpl->VectorConstants.remove(this);
1192 destroyConstantImpl();
1195 /// This function will return true iff every element in this vector constant
1196 /// is set to all ones.
1197 /// @returns true iff this constant's emements are all set to all ones.
1198 /// @brief Determine if the value is all ones.
1199 bool ConstantVector::isAllOnesValue() const {
1200 // Check out first element.
1201 const Constant *Elt = getOperand(0);
1202 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
1203 if (!CI || !CI->isAllOnesValue()) return false;
1204 // Then make sure all remaining elements point to the same value.
1205 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
1206 if (getOperand(I) != Elt) return false;
1211 /// getSplatValue - If this is a splat constant, where all of the
1212 /// elements have the same value, return that value. Otherwise return null.
1213 Constant *ConstantVector::getSplatValue() {
1214 // Check out first element.
1215 Constant *Elt = getOperand(0);
1216 // Then make sure all remaining elements point to the same value.
1217 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1218 if (getOperand(I) != Elt) return 0;
1222 //---- ConstantPointerNull::get() implementation...
1225 static char getValType(ConstantPointerNull *) {
1230 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
1231 // Implicitly locked.
1232 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1235 // destroyConstant - Remove the constant from the constant table...
1237 void ConstantPointerNull::destroyConstant() {
1238 // Implicitly locked.
1239 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1240 destroyConstantImpl();
1244 //---- UndefValue::get() implementation...
1247 static char getValType(UndefValue *) {
1251 UndefValue *UndefValue::get(const Type *Ty) {
1252 // Implicitly locked.
1253 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1256 // destroyConstant - Remove the constant from the constant table.
1258 void UndefValue::destroyConstant() {
1259 // Implicitly locked.
1260 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1261 destroyConstantImpl();
1264 //---- ConstantExpr::get() implementations...
1269 struct ExprMapKeyType {
1270 typedef SmallVector<unsigned, 4> IndexList;
1272 ExprMapKeyType(unsigned opc,
1273 const std::vector<Constant*> &ops,
1274 unsigned short pred = 0,
1275 const IndexList &inds = IndexList())
1276 : opcode(opc), predicate(pred), operands(ops), indices(inds) {}
1279 std::vector<Constant*> operands;
1281 bool operator==(const ExprMapKeyType& that) const {
1282 return this->opcode == that.opcode &&
1283 this->predicate == that.predicate &&
1284 this->operands == that.operands &&
1285 this->indices == that.indices;
1287 bool operator<(const ExprMapKeyType & that) const {
1288 return this->opcode < that.opcode ||
1289 (this->opcode == that.opcode && this->predicate < that.predicate) ||
1290 (this->opcode == that.opcode && this->predicate == that.predicate &&
1291 this->operands < that.operands) ||
1292 (this->opcode == that.opcode && this->predicate == that.predicate &&
1293 this->operands == that.operands && this->indices < that.indices);
1296 bool operator!=(const ExprMapKeyType& that) const {
1297 return !(*this == that);
1305 struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
1306 static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V,
1307 unsigned short pred = 0) {
1308 if (Instruction::isCast(V.opcode))
1309 return new UnaryConstantExpr(V.opcode, V.operands[0], Ty);
1310 if ((V.opcode >= Instruction::BinaryOpsBegin &&
1311 V.opcode < Instruction::BinaryOpsEnd))
1312 return new BinaryConstantExpr(V.opcode, V.operands[0], V.operands[1]);
1313 if (V.opcode == Instruction::Select)
1314 return new SelectConstantExpr(V.operands[0], V.operands[1],
1316 if (V.opcode == Instruction::ExtractElement)
1317 return new ExtractElementConstantExpr(V.operands[0], V.operands[1]);
1318 if (V.opcode == Instruction::InsertElement)
1319 return new InsertElementConstantExpr(V.operands[0], V.operands[1],
1321 if (V.opcode == Instruction::ShuffleVector)
1322 return new ShuffleVectorConstantExpr(V.operands[0], V.operands[1],
1324 if (V.opcode == Instruction::InsertValue)
1325 return new InsertValueConstantExpr(V.operands[0], V.operands[1],
1327 if (V.opcode == Instruction::ExtractValue)
1328 return new ExtractValueConstantExpr(V.operands[0], V.indices, Ty);
1329 if (V.opcode == Instruction::GetElementPtr) {
1330 std::vector<Constant*> IdxList(V.operands.begin()+1, V.operands.end());
1331 return GetElementPtrConstantExpr::Create(V.operands[0], IdxList, Ty);
1334 // The compare instructions are weird. We have to encode the predicate
1335 // value and it is combined with the instruction opcode by multiplying
1336 // the opcode by one hundred. We must decode this to get the predicate.
1337 if (V.opcode == Instruction::ICmp)
1338 return new CompareConstantExpr(Ty, Instruction::ICmp, V.predicate,
1339 V.operands[0], V.operands[1]);
1340 if (V.opcode == Instruction::FCmp)
1341 return new CompareConstantExpr(Ty, Instruction::FCmp, V.predicate,
1342 V.operands[0], V.operands[1]);
1343 llvm_unreachable("Invalid ConstantExpr!");
1349 struct ConvertConstantType<ConstantExpr, Type> {
1350 static void convert(ConstantExpr *OldC, const Type *NewTy) {
1352 switch (OldC->getOpcode()) {
1353 case Instruction::Trunc:
1354 case Instruction::ZExt:
1355 case Instruction::SExt:
1356 case Instruction::FPTrunc:
1357 case Instruction::FPExt:
1358 case Instruction::UIToFP:
1359 case Instruction::SIToFP:
1360 case Instruction::FPToUI:
1361 case Instruction::FPToSI:
1362 case Instruction::PtrToInt:
1363 case Instruction::IntToPtr:
1364 case Instruction::BitCast:
1365 New = ConstantExpr::getCast(OldC->getOpcode(), OldC->getOperand(0),
1368 case Instruction::Select:
1369 New = ConstantExpr::getSelectTy(NewTy, OldC->getOperand(0),
1370 OldC->getOperand(1),
1371 OldC->getOperand(2));
1374 assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
1375 OldC->getOpcode() < Instruction::BinaryOpsEnd);
1376 New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
1377 OldC->getOperand(1));
1379 case Instruction::GetElementPtr:
1380 // Make everyone now use a constant of the new type...
1381 std::vector<Value*> Idx(OldC->op_begin()+1, OldC->op_end());
1382 New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0),
1383 &Idx[0], Idx.size());
1387 assert(New != OldC && "Didn't replace constant??");
1388 OldC->uncheckedReplaceAllUsesWith(New);
1389 OldC->destroyConstant(); // This constant is now dead, destroy it.
1392 } // end namespace llvm
1395 static ExprMapKeyType getValType(ConstantExpr *CE) {
1396 std::vector<Constant*> Operands;
1397 Operands.reserve(CE->getNumOperands());
1398 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1399 Operands.push_back(cast<Constant>(CE->getOperand(i)));
1400 return ExprMapKeyType(CE->getOpcode(), Operands,
1401 CE->isCompare() ? CE->getPredicate() : 0,
1403 CE->getIndices() : SmallVector<unsigned, 4>());
1406 static ManagedStatic<ValueMap<ExprMapKeyType, Type,
1407 ConstantExpr> > ExprConstants;
1409 /// This is a utility function to handle folding of casts and lookup of the
1410 /// cast in the ExprConstants map. It is used by the various get* methods below.
1411 static inline Constant *getFoldedCast(
1412 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1413 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1414 // Fold a few common cases
1415 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1418 // Look up the constant in the table first to ensure uniqueness
1419 std::vector<Constant*> argVec(1, C);
1420 ExprMapKeyType Key(opc, argVec);
1422 // Implicitly locked.
1423 return ExprConstants->getOrCreate(Ty, Key);
1426 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1427 Instruction::CastOps opc = Instruction::CastOps(oc);
1428 assert(Instruction::isCast(opc) && "opcode out of range");
1429 assert(C && Ty && "Null arguments to getCast");
1430 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1434 llvm_unreachable("Invalid cast opcode");
1436 case Instruction::Trunc: return getTrunc(C, Ty);
1437 case Instruction::ZExt: return getZExt(C, Ty);
1438 case Instruction::SExt: return getSExt(C, Ty);
1439 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1440 case Instruction::FPExt: return getFPExtend(C, Ty);
1441 case Instruction::UIToFP: return getUIToFP(C, Ty);
1442 case Instruction::SIToFP: return getSIToFP(C, Ty);
1443 case Instruction::FPToUI: return getFPToUI(C, Ty);
1444 case Instruction::FPToSI: return getFPToSI(C, Ty);
1445 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1446 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1447 case Instruction::BitCast: return getBitCast(C, Ty);
1452 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1453 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1454 return getCast(Instruction::BitCast, C, Ty);
1455 return getCast(Instruction::ZExt, C, Ty);
1458 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1459 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1460 return getCast(Instruction::BitCast, C, Ty);
1461 return getCast(Instruction::SExt, C, Ty);
1464 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1465 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1466 return getCast(Instruction::BitCast, C, Ty);
1467 return getCast(Instruction::Trunc, C, Ty);
1470 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1471 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1472 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1474 if (Ty->isInteger())
1475 return getCast(Instruction::PtrToInt, S, Ty);
1476 return getCast(Instruction::BitCast, S, Ty);
1479 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1481 assert(C->getType()->isIntOrIntVector() &&
1482 Ty->isIntOrIntVector() && "Invalid cast");
1483 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1484 unsigned DstBits = Ty->getScalarSizeInBits();
1485 Instruction::CastOps opcode =
1486 (SrcBits == DstBits ? Instruction::BitCast :
1487 (SrcBits > DstBits ? Instruction::Trunc :
1488 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1489 return getCast(opcode, C, Ty);
1492 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1493 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1495 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1496 unsigned DstBits = Ty->getScalarSizeInBits();
1497 if (SrcBits == DstBits)
1498 return C; // Avoid a useless cast
1499 Instruction::CastOps opcode =
1500 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1501 return getCast(opcode, C, Ty);
1504 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1506 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1507 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1509 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1510 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1511 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1512 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1513 "SrcTy must be larger than DestTy for Trunc!");
1515 return getFoldedCast(Instruction::Trunc, C, Ty);
1518 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1520 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1521 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1523 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1524 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1525 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1526 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1527 "SrcTy must be smaller than DestTy for SExt!");
1529 return getFoldedCast(Instruction::SExt, C, Ty);
1532 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1534 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1535 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1537 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1538 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1539 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1540 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1541 "SrcTy must be smaller than DestTy for ZExt!");
1543 return getFoldedCast(Instruction::ZExt, C, Ty);
1546 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1548 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1549 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1551 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1552 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1553 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1554 "This is an illegal floating point truncation!");
1555 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1558 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1560 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1561 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1563 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1564 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1565 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1566 "This is an illegal floating point extension!");
1567 return getFoldedCast(Instruction::FPExt, C, Ty);
1570 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1572 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1573 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1575 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1576 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1577 "This is an illegal uint to floating point cast!");
1578 return getFoldedCast(Instruction::UIToFP, C, Ty);
1581 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1583 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1584 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1586 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1587 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1588 "This is an illegal sint to floating point cast!");
1589 return getFoldedCast(Instruction::SIToFP, C, Ty);
1592 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1594 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1595 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1597 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1598 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1599 "This is an illegal floating point to uint cast!");
1600 return getFoldedCast(Instruction::FPToUI, C, Ty);
1603 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1605 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1606 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1608 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1609 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1610 "This is an illegal floating point to sint cast!");
1611 return getFoldedCast(Instruction::FPToSI, C, Ty);
1614 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1615 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1616 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1617 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1620 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1621 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1622 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1623 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1626 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1627 // BitCast implies a no-op cast of type only. No bits change. However, you
1628 // can't cast pointers to anything but pointers.
1630 const Type *SrcTy = C->getType();
1631 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1632 "BitCast cannot cast pointer to non-pointer and vice versa");
1634 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1635 // or nonptr->ptr). For all the other types, the cast is okay if source and
1636 // destination bit widths are identical.
1637 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1638 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1640 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1642 // It is common to ask for a bitcast of a value to its own type, handle this
1644 if (C->getType() == DstTy) return C;
1646 return getFoldedCast(Instruction::BitCast, C, DstTy);
1649 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1650 Constant *C1, Constant *C2) {
1651 // Check the operands for consistency first
1652 assert(Opcode >= Instruction::BinaryOpsBegin &&
1653 Opcode < Instruction::BinaryOpsEnd &&
1654 "Invalid opcode in binary constant expression");
1655 assert(C1->getType() == C2->getType() &&
1656 "Operand types in binary constant expression should match");
1658 if (ReqTy == C1->getType() || ReqTy == Type::Int1Ty)
1659 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1661 return FC; // Fold a few common cases...
1663 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1664 ExprMapKeyType Key(Opcode, argVec);
1666 // Implicitly locked.
1667 return ExprConstants->getOrCreate(ReqTy, Key);
1670 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1671 Constant *C1, Constant *C2) {
1672 switch (predicate) {
1673 default: llvm_unreachable("Invalid CmpInst predicate");
1674 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1675 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1676 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1677 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1678 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1679 case CmpInst::FCMP_TRUE:
1680 return getFCmp(predicate, C1, C2);
1682 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1683 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1684 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1685 case CmpInst::ICMP_SLE:
1686 return getICmp(predicate, C1, C2);
1690 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
1691 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1692 if (C1->getType()->isFPOrFPVector()) {
1693 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1694 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1695 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1699 case Instruction::Add:
1700 case Instruction::Sub:
1701 case Instruction::Mul:
1702 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1703 assert(C1->getType()->isIntOrIntVector() &&
1704 "Tried to create an integer operation on a non-integer type!");
1706 case Instruction::FAdd:
1707 case Instruction::FSub:
1708 case Instruction::FMul:
1709 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1710 assert(C1->getType()->isFPOrFPVector() &&
1711 "Tried to create a floating-point operation on a "
1712 "non-floating-point type!");
1714 case Instruction::UDiv:
1715 case Instruction::SDiv:
1716 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1717 assert(C1->getType()->isIntOrIntVector() &&
1718 "Tried to create an arithmetic operation on a non-arithmetic type!");
1720 case Instruction::FDiv:
1721 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1722 assert(C1->getType()->isFPOrFPVector() &&
1723 "Tried to create an arithmetic operation on a non-arithmetic type!");
1725 case Instruction::URem:
1726 case Instruction::SRem:
1727 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1728 assert(C1->getType()->isIntOrIntVector() &&
1729 "Tried to create an arithmetic operation on a non-arithmetic type!");
1731 case Instruction::FRem:
1732 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1733 assert(C1->getType()->isFPOrFPVector() &&
1734 "Tried to create an arithmetic operation on a non-arithmetic type!");
1736 case Instruction::And:
1737 case Instruction::Or:
1738 case Instruction::Xor:
1739 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1740 assert(C1->getType()->isIntOrIntVector() &&
1741 "Tried to create a logical operation on a non-integral type!");
1743 case Instruction::Shl:
1744 case Instruction::LShr:
1745 case Instruction::AShr:
1746 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1747 assert(C1->getType()->isIntOrIntVector() &&
1748 "Tried to create a shift operation on a non-integer type!");
1755 return getTy(C1->getType(), Opcode, C1, C2);
1758 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1759 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1760 // Note that a non-inbounds gep is used, as null isn't within any object.
1761 Constant *GEPIdx = ConstantInt::get(Type::Int32Ty, 1);
1762 Constant *GEP = getGetElementPtr(
1763 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1764 return getCast(Instruction::PtrToInt, GEP, Type::Int64Ty);
1767 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1768 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1769 const Type *AligningTy = StructType::get(Type::Int8Ty, Ty, NULL);
1770 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1771 Constant *Zero = ConstantInt::get(Type::Int32Ty, 0);
1772 Constant *One = ConstantInt::get(Type::Int32Ty, 1);
1773 Constant *Indices[2] = { Zero, One };
1774 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1775 return getCast(Instruction::PtrToInt, GEP, Type::Int32Ty);
1779 Constant *ConstantExpr::getCompare(unsigned short pred,
1780 Constant *C1, Constant *C2) {
1781 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1782 return getCompareTy(pred, C1, C2);
1785 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1786 Constant *V1, Constant *V2) {
1787 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1789 if (ReqTy == V1->getType())
1790 if (Constant *SC = ConstantFoldSelectInstruction(
1791 ReqTy->getContext(), C, V1, V2))
1792 return SC; // Fold common cases
1794 std::vector<Constant*> argVec(3, C);
1797 ExprMapKeyType Key(Instruction::Select, argVec);
1799 // Implicitly locked.
1800 return ExprConstants->getOrCreate(ReqTy, Key);
1803 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1806 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1808 cast<PointerType>(ReqTy)->getElementType() &&
1809 "GEP indices invalid!");
1811 if (Constant *FC = ConstantFoldGetElementPtr(
1812 ReqTy->getContext(), C, (Constant**)Idxs, NumIdx))
1813 return FC; // Fold a few common cases...
1815 assert(isa<PointerType>(C->getType()) &&
1816 "Non-pointer type for constant GetElementPtr expression");
1817 // Look up the constant in the table first to ensure uniqueness
1818 std::vector<Constant*> ArgVec;
1819 ArgVec.reserve(NumIdx+1);
1820 ArgVec.push_back(C);
1821 for (unsigned i = 0; i != NumIdx; ++i)
1822 ArgVec.push_back(cast<Constant>(Idxs[i]));
1823 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1825 // Implicitly locked.
1826 return ExprConstants->getOrCreate(ReqTy, Key);
1829 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1831 // Get the result type of the getelementptr!
1833 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1834 assert(Ty && "GEP indices invalid!");
1835 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1836 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1839 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1841 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1846 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1847 assert(LHS->getType() == RHS->getType());
1848 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1849 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1851 if (Constant *FC = ConstantFoldCompareInstruction(
1852 LHS->getContext(), pred, LHS, RHS))
1853 return FC; // Fold a few common cases...
1855 // Look up the constant in the table first to ensure uniqueness
1856 std::vector<Constant*> ArgVec;
1857 ArgVec.push_back(LHS);
1858 ArgVec.push_back(RHS);
1859 // Get the key type with both the opcode and predicate
1860 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1862 // Implicitly locked.
1863 return ExprConstants->getOrCreate(Type::Int1Ty, Key);
1867 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1868 assert(LHS->getType() == RHS->getType());
1869 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1871 if (Constant *FC = ConstantFoldCompareInstruction(
1872 LHS->getContext(), pred, LHS, RHS))
1873 return FC; // Fold a few common cases...
1875 // Look up the constant in the table first to ensure uniqueness
1876 std::vector<Constant*> ArgVec;
1877 ArgVec.push_back(LHS);
1878 ArgVec.push_back(RHS);
1879 // Get the key type with both the opcode and predicate
1880 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1882 // Implicitly locked.
1883 return ExprConstants->getOrCreate(Type::Int1Ty, Key);
1886 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1888 if (Constant *FC = ConstantFoldExtractElementInstruction(
1889 ReqTy->getContext(), Val, Idx))
1890 return FC; // Fold a few common cases...
1891 // Look up the constant in the table first to ensure uniqueness
1892 std::vector<Constant*> ArgVec(1, Val);
1893 ArgVec.push_back(Idx);
1894 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1896 // Implicitly locked.
1897 return ExprConstants->getOrCreate(ReqTy, Key);
1900 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1901 assert(isa<VectorType>(Val->getType()) &&
1902 "Tried to create extractelement operation on non-vector type!");
1903 assert(Idx->getType() == Type::Int32Ty &&
1904 "Extractelement index must be i32 type!");
1905 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1909 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1910 Constant *Elt, Constant *Idx) {
1911 if (Constant *FC = ConstantFoldInsertElementInstruction(
1912 ReqTy->getContext(), Val, Elt, Idx))
1913 return FC; // Fold a few common cases...
1914 // Look up the constant in the table first to ensure uniqueness
1915 std::vector<Constant*> ArgVec(1, Val);
1916 ArgVec.push_back(Elt);
1917 ArgVec.push_back(Idx);
1918 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1920 // Implicitly locked.
1921 return ExprConstants->getOrCreate(ReqTy, Key);
1924 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1926 assert(isa<VectorType>(Val->getType()) &&
1927 "Tried to create insertelement operation on non-vector type!");
1928 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1929 && "Insertelement types must match!");
1930 assert(Idx->getType() == Type::Int32Ty &&
1931 "Insertelement index must be i32 type!");
1932 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1935 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1936 Constant *V2, Constant *Mask) {
1937 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1938 ReqTy->getContext(), V1, V2, Mask))
1939 return FC; // Fold a few common cases...
1940 // Look up the constant in the table first to ensure uniqueness
1941 std::vector<Constant*> ArgVec(1, V1);
1942 ArgVec.push_back(V2);
1943 ArgVec.push_back(Mask);
1944 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1946 // Implicitly locked.
1947 return ExprConstants->getOrCreate(ReqTy, Key);
1950 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1952 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1953 "Invalid shuffle vector constant expr operands!");
1955 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1956 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1957 const Type *ShufTy = VectorType::get(EltTy, NElts);
1958 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1961 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1963 const unsigned *Idxs, unsigned NumIdx) {
1964 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1965 Idxs+NumIdx) == Val->getType() &&
1966 "insertvalue indices invalid!");
1967 assert(Agg->getType() == ReqTy &&
1968 "insertvalue type invalid!");
1969 assert(Agg->getType()->isFirstClassType() &&
1970 "Non-first-class type for constant InsertValue expression");
1971 Constant *FC = ConstantFoldInsertValueInstruction(
1972 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1973 assert(FC && "InsertValue constant expr couldn't be folded!");
1977 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1978 const unsigned *IdxList, unsigned NumIdx) {
1979 assert(Agg->getType()->isFirstClassType() &&
1980 "Tried to create insertelement operation on non-first-class type!");
1982 const Type *ReqTy = Agg->getType();
1985 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1987 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1988 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1991 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1992 const unsigned *Idxs, unsigned NumIdx) {
1993 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1994 Idxs+NumIdx) == ReqTy &&
1995 "extractvalue indices invalid!");
1996 assert(Agg->getType()->isFirstClassType() &&
1997 "Non-first-class type for constant extractvalue expression");
1998 Constant *FC = ConstantFoldExtractValueInstruction(
1999 ReqTy->getContext(), Agg, Idxs, NumIdx);
2000 assert(FC && "ExtractValue constant expr couldn't be folded!");
2004 Constant *ConstantExpr::getExtractValue(Constant *Agg,
2005 const unsigned *IdxList, unsigned NumIdx) {
2006 assert(Agg->getType()->isFirstClassType() &&
2007 "Tried to create extractelement operation on non-first-class type!");
2010 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
2011 assert(ReqTy && "extractvalue indices invalid!");
2012 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
2015 Constant* ConstantExpr::getNeg(Constant* C) {
2016 // API compatibility: Adjust integer opcodes to floating-point opcodes.
2017 if (C->getType()->isFPOrFPVector())
2019 assert(C->getType()->isIntOrIntVector() &&
2020 "Cannot NEG a nonintegral value!");
2021 return get(Instruction::Sub,
2022 ConstantFP::getZeroValueForNegation(C->getType()),
2026 Constant* ConstantExpr::getFNeg(Constant* C) {
2027 assert(C->getType()->isFPOrFPVector() &&
2028 "Cannot FNEG a non-floating-point value!");
2029 return get(Instruction::FSub,
2030 ConstantFP::getZeroValueForNegation(C->getType()),
2034 Constant* ConstantExpr::getNot(Constant* C) {
2035 assert(C->getType()->isIntOrIntVector() &&
2036 "Cannot NOT a nonintegral value!");
2037 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
2040 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
2041 return get(Instruction::Add, C1, C2);
2044 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
2045 return get(Instruction::FAdd, C1, C2);
2048 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
2049 return get(Instruction::Sub, C1, C2);
2052 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
2053 return get(Instruction::FSub, C1, C2);
2056 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
2057 return get(Instruction::Mul, C1, C2);
2060 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
2061 return get(Instruction::FMul, C1, C2);
2064 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
2065 return get(Instruction::UDiv, C1, C2);
2068 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
2069 return get(Instruction::SDiv, C1, C2);
2072 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
2073 return get(Instruction::FDiv, C1, C2);
2076 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
2077 return get(Instruction::URem, C1, C2);
2080 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
2081 return get(Instruction::SRem, C1, C2);
2084 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
2085 return get(Instruction::FRem, C1, C2);
2088 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
2089 return get(Instruction::And, C1, C2);
2092 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
2093 return get(Instruction::Or, C1, C2);
2096 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
2097 return get(Instruction::Xor, C1, C2);
2100 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
2101 return get(Instruction::Shl, C1, C2);
2104 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
2105 return get(Instruction::LShr, C1, C2);
2108 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
2109 return get(Instruction::AShr, C1, C2);
2112 // destroyConstant - Remove the constant from the constant table...
2114 void ConstantExpr::destroyConstant() {
2115 // Implicitly locked.
2116 ExprConstants->remove(this);
2117 destroyConstantImpl();
2120 const char *ConstantExpr::getOpcodeName() const {
2121 return Instruction::getOpcodeName(getOpcode());
2124 //===----------------------------------------------------------------------===//
2125 // replaceUsesOfWithOnConstant implementations
2127 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2128 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2131 /// Note that we intentionally replace all uses of From with To here. Consider
2132 /// a large array that uses 'From' 1000 times. By handling this case all here,
2133 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2134 /// single invocation handles all 1000 uses. Handling them one at a time would
2135 /// work, but would be really slow because it would have to unique each updated
2138 static std::vector<Constant*> getValType(ConstantArray *CA) {
2139 std::vector<Constant*> Elements;
2140 Elements.reserve(CA->getNumOperands());
2141 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
2142 Elements.push_back(cast<Constant>(CA->getOperand(i)));
2147 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2149 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2150 Constant *ToC = cast<Constant>(To);
2152 LLVMContext &Context = getType()->getContext();
2153 LLVMContextImpl *pImpl = Context.pImpl;
2155 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, Constant*> Lookup;
2156 Lookup.first.first = getType();
2157 Lookup.second = this;
2159 std::vector<Constant*> &Values = Lookup.first.second;
2160 Values.reserve(getNumOperands()); // Build replacement array.
2162 // Fill values with the modified operands of the constant array. Also,
2163 // compute whether this turns into an all-zeros array.
2164 bool isAllZeros = false;
2165 unsigned NumUpdated = 0;
2166 if (!ToC->isNullValue()) {
2167 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2168 Constant *Val = cast<Constant>(O->get());
2173 Values.push_back(Val);
2177 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2178 Constant *Val = cast<Constant>(O->get());
2183 Values.push_back(Val);
2184 if (isAllZeros) isAllZeros = Val->isNullValue();
2188 Constant *Replacement = 0;
2190 Replacement = ConstantAggregateZero::get(getType());
2192 // Check to see if we have this array type already.
2193 sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
2195 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2196 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2199 Replacement = I->second;
2201 // Okay, the new shape doesn't exist in the system yet. Instead of
2202 // creating a new constant array, inserting it, replaceallusesof'ing the
2203 // old with the new, then deleting the old... just update the current one
2205 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2207 // Update to the new value. Optimize for the case when we have a single
2208 // operand that we're changing, but handle bulk updates efficiently.
2209 if (NumUpdated == 1) {
2210 unsigned OperandToUpdate = U - OperandList;
2211 assert(getOperand(OperandToUpdate) == From &&
2212 "ReplaceAllUsesWith broken!");
2213 setOperand(OperandToUpdate, ToC);
2215 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2216 if (getOperand(i) == From)
2223 // Otherwise, I do need to replace this with an existing value.
2224 assert(Replacement != this && "I didn't contain From!");
2226 // Everyone using this now uses the replacement.
2227 uncheckedReplaceAllUsesWith(Replacement);
2229 // Delete the old constant!
2233 static std::vector<Constant*> getValType(ConstantStruct *CS) {
2234 std::vector<Constant*> Elements;
2235 Elements.reserve(CS->getNumOperands());
2236 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i)
2237 Elements.push_back(cast<Constant>(CS->getOperand(i)));
2241 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2243 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2244 Constant *ToC = cast<Constant>(To);
2246 unsigned OperandToUpdate = U-OperandList;
2247 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2249 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, Constant*> Lookup;
2250 Lookup.first.first = getType();
2251 Lookup.second = this;
2252 std::vector<Constant*> &Values = Lookup.first.second;
2253 Values.reserve(getNumOperands()); // Build replacement struct.
2256 // Fill values with the modified operands of the constant struct. Also,
2257 // compute whether this turns into an all-zeros struct.
2258 bool isAllZeros = false;
2259 if (!ToC->isNullValue()) {
2260 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2261 Values.push_back(cast<Constant>(O->get()));
2264 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2265 Constant *Val = cast<Constant>(O->get());
2266 Values.push_back(Val);
2267 if (isAllZeros) isAllZeros = Val->isNullValue();
2270 Values[OperandToUpdate] = ToC;
2272 LLVMContext &Context = getType()->getContext();
2273 LLVMContextImpl *pImpl = Context.pImpl;
2275 Constant *Replacement = 0;
2277 Replacement = ConstantAggregateZero::get(getType());
2279 // Check to see if we have this array type already.
2280 sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
2282 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2283 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2286 Replacement = I->second;
2288 // Okay, the new shape doesn't exist in the system yet. Instead of
2289 // creating a new constant struct, inserting it, replaceallusesof'ing the
2290 // old with the new, then deleting the old... just update the current one
2292 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2294 // Update to the new value.
2295 setOperand(OperandToUpdate, ToC);
2300 assert(Replacement != this && "I didn't contain From!");
2302 // Everyone using this now uses the replacement.
2303 uncheckedReplaceAllUsesWith(Replacement);
2305 // Delete the old constant!
2309 static std::vector<Constant*> getValType(ConstantVector *CP) {
2310 std::vector<Constant*> Elements;
2311 Elements.reserve(CP->getNumOperands());
2312 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
2313 Elements.push_back(CP->getOperand(i));
2317 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2319 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2321 std::vector<Constant*> Values;
2322 Values.reserve(getNumOperands()); // Build replacement array...
2323 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2324 Constant *Val = getOperand(i);
2325 if (Val == From) Val = cast<Constant>(To);
2326 Values.push_back(Val);
2329 Constant *Replacement = get(getType(), Values);
2330 assert(Replacement != this && "I didn't contain From!");
2332 // Everyone using this now uses the replacement.
2333 uncheckedReplaceAllUsesWith(Replacement);
2335 // Delete the old constant!
2339 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2341 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2342 Constant *To = cast<Constant>(ToV);
2344 Constant *Replacement = 0;
2345 if (getOpcode() == Instruction::GetElementPtr) {
2346 SmallVector<Constant*, 8> Indices;
2347 Constant *Pointer = getOperand(0);
2348 Indices.reserve(getNumOperands()-1);
2349 if (Pointer == From) Pointer = To;
2351 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2352 Constant *Val = getOperand(i);
2353 if (Val == From) Val = To;
2354 Indices.push_back(Val);
2356 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2357 &Indices[0], Indices.size());
2358 } else if (getOpcode() == Instruction::ExtractValue) {
2359 Constant *Agg = getOperand(0);
2360 if (Agg == From) Agg = To;
2362 const SmallVector<unsigned, 4> &Indices = getIndices();
2363 Replacement = ConstantExpr::getExtractValue(Agg,
2364 &Indices[0], Indices.size());
2365 } else if (getOpcode() == Instruction::InsertValue) {
2366 Constant *Agg = getOperand(0);
2367 Constant *Val = getOperand(1);
2368 if (Agg == From) Agg = To;
2369 if (Val == From) Val = To;
2371 const SmallVector<unsigned, 4> &Indices = getIndices();
2372 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2373 &Indices[0], Indices.size());
2374 } else if (isCast()) {
2375 assert(getOperand(0) == From && "Cast only has one use!");
2376 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2377 } else if (getOpcode() == Instruction::Select) {
2378 Constant *C1 = getOperand(0);
2379 Constant *C2 = getOperand(1);
2380 Constant *C3 = getOperand(2);
2381 if (C1 == From) C1 = To;
2382 if (C2 == From) C2 = To;
2383 if (C3 == From) C3 = To;
2384 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2385 } else if (getOpcode() == Instruction::ExtractElement) {
2386 Constant *C1 = getOperand(0);
2387 Constant *C2 = getOperand(1);
2388 if (C1 == From) C1 = To;
2389 if (C2 == From) C2 = To;
2390 Replacement = ConstantExpr::getExtractElement(C1, C2);
2391 } else if (getOpcode() == Instruction::InsertElement) {
2392 Constant *C1 = getOperand(0);
2393 Constant *C2 = getOperand(1);
2394 Constant *C3 = getOperand(1);
2395 if (C1 == From) C1 = To;
2396 if (C2 == From) C2 = To;
2397 if (C3 == From) C3 = To;
2398 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2399 } else if (getOpcode() == Instruction::ShuffleVector) {
2400 Constant *C1 = getOperand(0);
2401 Constant *C2 = getOperand(1);
2402 Constant *C3 = getOperand(2);
2403 if (C1 == From) C1 = To;
2404 if (C2 == From) C2 = To;
2405 if (C3 == From) C3 = To;
2406 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2407 } else if (isCompare()) {
2408 Constant *C1 = getOperand(0);
2409 Constant *C2 = getOperand(1);
2410 if (C1 == From) C1 = To;
2411 if (C2 == From) C2 = To;
2412 if (getOpcode() == Instruction::ICmp)
2413 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2415 assert(getOpcode() == Instruction::FCmp);
2416 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2418 } else if (getNumOperands() == 2) {
2419 Constant *C1 = getOperand(0);
2420 Constant *C2 = getOperand(1);
2421 if (C1 == From) C1 = To;
2422 if (C2 == From) C2 = To;
2423 Replacement = ConstantExpr::get(getOpcode(), C1, C2);
2425 llvm_unreachable("Unknown ConstantExpr type!");
2429 assert(Replacement != this && "I didn't contain From!");
2431 // Everyone using this now uses the replacement.
2432 uncheckedReplaceAllUsesWith(Replacement);
2434 // Delete the old constant!