1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "LLVMContextImpl.h"
16 #include "ConstantFold.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/GlobalValue.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/Operator.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/System/Mutex.h"
33 #include "llvm/System/RWMutex.h"
34 #include "llvm/System/Threading.h"
35 #include "llvm/ADT/DenseMap.h"
36 #include "llvm/ADT/SmallVector.h"
41 //===----------------------------------------------------------------------===//
43 //===----------------------------------------------------------------------===//
45 // Constructor to create a '0' constant of arbitrary type...
46 static const uint64_t zero[2] = {0, 0};
47 Constant *Constant::getNullValue(const Type *Ty) {
48 switch (Ty->getTypeID()) {
49 case Type::IntegerTyID:
50 return ConstantInt::get(Ty, 0);
52 return ConstantFP::get(Ty->getContext(), APFloat(APInt(32, 0)));
53 case Type::DoubleTyID:
54 return ConstantFP::get(Ty->getContext(), APFloat(APInt(64, 0)));
55 case Type::X86_FP80TyID:
56 return ConstantFP::get(Ty->getContext(), APFloat(APInt(80, 2, zero)));
58 return ConstantFP::get(Ty->getContext(),
59 APFloat(APInt(128, 2, zero), true));
60 case Type::PPC_FP128TyID:
61 return ConstantFP::get(Ty->getContext(), APFloat(APInt(128, 2, zero)));
62 case Type::PointerTyID:
63 return ConstantPointerNull::get(cast<PointerType>(Ty));
64 case Type::StructTyID:
66 case Type::VectorTyID:
67 return ConstantAggregateZero::get(Ty);
69 // Function, Label, or Opaque type?
70 assert(!"Cannot create a null constant of that type!");
75 Constant* Constant::getIntegerValue(const Type *Ty, const APInt &V) {
76 const Type *ScalarTy = Ty->getScalarType();
78 // Create the base integer constant.
79 Constant *C = ConstantInt::get(Ty->getContext(), V);
81 // Convert an integer to a pointer, if necessary.
82 if (const PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
83 C = ConstantExpr::getIntToPtr(C, PTy);
85 // Broadcast a scalar to a vector, if necessary.
86 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
87 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
92 Constant* Constant::getAllOnesValue(const Type *Ty) {
93 if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty))
94 return ConstantInt::get(Ty->getContext(),
95 APInt::getAllOnesValue(ITy->getBitWidth()));
97 std::vector<Constant*> Elts;
98 const VectorType *VTy = cast<VectorType>(Ty);
99 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
100 assert(Elts[0] && "Not a vector integer type!");
101 return cast<ConstantVector>(ConstantVector::get(Elts));
104 void Constant::destroyConstantImpl() {
105 // When a Constant is destroyed, there may be lingering
106 // references to the constant by other constants in the constant pool. These
107 // constants are implicitly dependent on the module that is being deleted,
108 // but they don't know that. Because we only find out when the CPV is
109 // deleted, we must now notify all of our users (that should only be
110 // Constants) that they are, in fact, invalid now and should be deleted.
112 while (!use_empty()) {
113 Value *V = use_back();
114 #ifndef NDEBUG // Only in -g mode...
115 if (!isa<Constant>(V)) {
116 errs() << "While deleting: " << *this
117 << "\n\nUse still stuck around after Def is destroyed: "
121 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
122 Constant *CV = cast<Constant>(V);
123 CV->destroyConstant();
125 // The constant should remove itself from our use list...
126 assert((use_empty() || use_back() != V) && "Constant not removed!");
129 // Value has no outstanding references it is safe to delete it now...
133 /// canTrap - Return true if evaluation of this constant could trap. This is
134 /// true for things like constant expressions that could divide by zero.
135 bool Constant::canTrap() const {
136 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
137 // The only thing that could possibly trap are constant exprs.
138 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
139 if (!CE) return false;
141 // ConstantExpr traps if any operands can trap.
142 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
143 if (CE->getOperand(i)->canTrap())
146 // Otherwise, only specific operations can trap.
147 switch (CE->getOpcode()) {
150 case Instruction::UDiv:
151 case Instruction::SDiv:
152 case Instruction::FDiv:
153 case Instruction::URem:
154 case Instruction::SRem:
155 case Instruction::FRem:
156 // Div and rem can trap if the RHS is not known to be non-zero.
157 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
164 /// getRelocationInfo - This method classifies the entry according to
165 /// whether or not it may generate a relocation entry. This must be
166 /// conservative, so if it might codegen to a relocatable entry, it should say
167 /// so. The return values are:
169 /// NoRelocation: This constant pool entry is guaranteed to never have a
170 /// relocation applied to it (because it holds a simple constant like
172 /// LocalRelocation: This entry has relocations, but the entries are
173 /// guaranteed to be resolvable by the static linker, so the dynamic
174 /// linker will never see them.
175 /// GlobalRelocations: This entry may have arbitrary relocations.
177 /// FIXME: This really should not be in VMCore.
178 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
179 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
180 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
181 return LocalRelocation; // Local to this file/library.
182 return GlobalRelocations; // Global reference.
185 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
186 return BA->getFunction()->getRelocationInfo();
188 PossibleRelocationsTy Result = NoRelocation;
189 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
190 Result = std::max(Result,
191 cast<Constant>(getOperand(i))->getRelocationInfo());
197 /// getVectorElements - This method, which is only valid on constant of vector
198 /// type, returns the elements of the vector in the specified smallvector.
199 /// This handles breaking down a vector undef into undef elements, etc. For
200 /// constant exprs and other cases we can't handle, we return an empty vector.
201 void Constant::getVectorElements(LLVMContext &Context,
202 SmallVectorImpl<Constant*> &Elts) const {
203 assert(isa<VectorType>(getType()) && "Not a vector constant!");
205 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
206 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
207 Elts.push_back(CV->getOperand(i));
211 const VectorType *VT = cast<VectorType>(getType());
212 if (isa<ConstantAggregateZero>(this)) {
213 Elts.assign(VT->getNumElements(),
214 Constant::getNullValue(VT->getElementType()));
218 if (isa<UndefValue>(this)) {
219 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
223 // Unknown type, must be constant expr etc.
228 //===----------------------------------------------------------------------===//
230 //===----------------------------------------------------------------------===//
232 ConstantInt::ConstantInt(const IntegerType *Ty, const APInt& V)
233 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
234 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
237 ConstantInt* ConstantInt::getTrue(LLVMContext &Context) {
238 LLVMContextImpl *pImpl = Context.pImpl;
239 if (pImpl->TheTrueVal)
240 return pImpl->TheTrueVal;
242 return (pImpl->TheTrueVal =
243 ConstantInt::get(IntegerType::get(Context, 1), 1));
246 ConstantInt* ConstantInt::getFalse(LLVMContext &Context) {
247 LLVMContextImpl *pImpl = Context.pImpl;
248 if (pImpl->TheFalseVal)
249 return pImpl->TheFalseVal;
251 return (pImpl->TheFalseVal =
252 ConstantInt::get(IntegerType::get(Context, 1), 0));
256 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
257 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
258 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
259 // compare APInt's of different widths, which would violate an APInt class
260 // invariant which generates an assertion.
261 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt& V) {
262 // Get the corresponding integer type for the bit width of the value.
263 const IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
264 // get an existing value or the insertion position
265 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
266 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
267 if (!Slot) Slot = new ConstantInt(ITy, V);
271 Constant* ConstantInt::get(const Type* Ty, uint64_t V, bool isSigned) {
272 Constant *C = get(cast<IntegerType>(Ty->getScalarType()),
275 // For vectors, broadcast the value.
276 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
277 return ConstantVector::get(
278 std::vector<Constant *>(VTy->getNumElements(), C));
283 ConstantInt* ConstantInt::get(const IntegerType* Ty, uint64_t V,
285 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
288 ConstantInt* ConstantInt::getSigned(const IntegerType* Ty, int64_t V) {
289 return get(Ty, V, true);
292 Constant *ConstantInt::getSigned(const Type *Ty, int64_t V) {
293 return get(Ty, V, true);
296 Constant* ConstantInt::get(const Type* Ty, const APInt& V) {
297 ConstantInt *C = get(Ty->getContext(), V);
298 assert(C->getType() == Ty->getScalarType() &&
299 "ConstantInt type doesn't match the type implied by its value!");
301 // For vectors, broadcast the value.
302 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
303 return ConstantVector::get(
304 std::vector<Constant *>(VTy->getNumElements(), C));
309 ConstantInt* ConstantInt::get(const IntegerType* Ty, const StringRef& Str,
311 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
314 //===----------------------------------------------------------------------===//
316 //===----------------------------------------------------------------------===//
318 static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
320 return &APFloat::IEEEsingle;
321 if (Ty->isDoubleTy())
322 return &APFloat::IEEEdouble;
323 if (Ty->isX86_FP80Ty())
324 return &APFloat::x87DoubleExtended;
325 else if (Ty->isFP128Ty())
326 return &APFloat::IEEEquad;
328 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
329 return &APFloat::PPCDoubleDouble;
332 /// get() - This returns a constant fp for the specified value in the
333 /// specified type. This should only be used for simple constant values like
334 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
335 Constant* ConstantFP::get(const Type* Ty, double V) {
336 LLVMContext &Context = Ty->getContext();
340 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
341 APFloat::rmNearestTiesToEven, &ignored);
342 Constant *C = get(Context, FV);
344 // For vectors, broadcast the value.
345 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
346 return ConstantVector::get(
347 std::vector<Constant *>(VTy->getNumElements(), C));
353 Constant* ConstantFP::get(const Type* Ty, const StringRef& Str) {
354 LLVMContext &Context = Ty->getContext();
356 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
357 Constant *C = get(Context, FV);
359 // For vectors, broadcast the value.
360 if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
361 return ConstantVector::get(
362 std::vector<Constant *>(VTy->getNumElements(), C));
368 ConstantFP* ConstantFP::getNegativeZero(const Type* Ty) {
369 LLVMContext &Context = Ty->getContext();
370 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
372 return get(Context, apf);
376 Constant* ConstantFP::getZeroValueForNegation(const Type* Ty) {
377 if (const VectorType *PTy = dyn_cast<VectorType>(Ty))
378 if (PTy->getElementType()->isFloatingPoint()) {
379 std::vector<Constant*> zeros(PTy->getNumElements(),
380 getNegativeZero(PTy->getElementType()));
381 return ConstantVector::get(PTy, zeros);
384 if (Ty->isFloatingPoint())
385 return getNegativeZero(Ty);
387 return Constant::getNullValue(Ty);
391 // ConstantFP accessors.
392 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
393 DenseMapAPFloatKeyInfo::KeyTy Key(V);
395 LLVMContextImpl* pImpl = Context.pImpl;
397 ConstantFP *&Slot = pImpl->FPConstants[Key];
401 if (&V.getSemantics() == &APFloat::IEEEsingle)
402 Ty = Type::getFloatTy(Context);
403 else if (&V.getSemantics() == &APFloat::IEEEdouble)
404 Ty = Type::getDoubleTy(Context);
405 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
406 Ty = Type::getX86_FP80Ty(Context);
407 else if (&V.getSemantics() == &APFloat::IEEEquad)
408 Ty = Type::getFP128Ty(Context);
410 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
411 "Unknown FP format");
412 Ty = Type::getPPC_FP128Ty(Context);
414 Slot = new ConstantFP(Ty, V);
420 ConstantFP *ConstantFP::getInfinity(const Type *Ty, bool Negative) {
421 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
422 return ConstantFP::get(Ty->getContext(),
423 APFloat::getInf(Semantics, Negative));
426 ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
427 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
428 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
432 bool ConstantFP::isNullValue() const {
433 return Val.isZero() && !Val.isNegative();
436 bool ConstantFP::isExactlyValue(const APFloat& V) const {
437 return Val.bitwiseIsEqual(V);
440 //===----------------------------------------------------------------------===//
441 // ConstantXXX Classes
442 //===----------------------------------------------------------------------===//
445 ConstantArray::ConstantArray(const ArrayType *T,
446 const std::vector<Constant*> &V)
447 : Constant(T, ConstantArrayVal,
448 OperandTraits<ConstantArray>::op_end(this) - V.size(),
450 assert(V.size() == T->getNumElements() &&
451 "Invalid initializer vector for constant array");
452 Use *OL = OperandList;
453 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
456 assert(C->getType() == T->getElementType() &&
457 "Initializer for array element doesn't match array element type!");
462 Constant *ConstantArray::get(const ArrayType *Ty,
463 const std::vector<Constant*> &V) {
464 for (unsigned i = 0, e = V.size(); i != e; ++i) {
465 assert(V[i]->getType() == Ty->getElementType() &&
466 "Wrong type in array element initializer");
468 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
469 // If this is an all-zero array, return a ConstantAggregateZero object
472 if (!C->isNullValue()) {
473 // Implicitly locked.
474 return pImpl->ArrayConstants.getOrCreate(Ty, V);
476 for (unsigned i = 1, e = V.size(); i != e; ++i)
478 // Implicitly locked.
479 return pImpl->ArrayConstants.getOrCreate(Ty, V);
483 return ConstantAggregateZero::get(Ty);
487 Constant* ConstantArray::get(const ArrayType* T, Constant* const* Vals,
489 // FIXME: make this the primary ctor method.
490 return get(T, std::vector<Constant*>(Vals, Vals+NumVals));
493 /// ConstantArray::get(const string&) - Return an array that is initialized to
494 /// contain the specified string. If length is zero then a null terminator is
495 /// added to the specified string so that it may be used in a natural way.
496 /// Otherwise, the length parameter specifies how much of the string to use
497 /// and it won't be null terminated.
499 Constant* ConstantArray::get(LLVMContext &Context, const StringRef &Str,
501 std::vector<Constant*> ElementVals;
502 for (unsigned i = 0; i < Str.size(); ++i)
503 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
505 // Add a null terminator to the string...
507 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
510 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
511 return get(ATy, ElementVals);
516 ConstantStruct::ConstantStruct(const StructType *T,
517 const std::vector<Constant*> &V)
518 : Constant(T, ConstantStructVal,
519 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
521 assert(V.size() == T->getNumElements() &&
522 "Invalid initializer vector for constant structure");
523 Use *OL = OperandList;
524 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
527 assert(C->getType() == T->getElementType(I-V.begin()) &&
528 "Initializer for struct element doesn't match struct element type!");
533 // ConstantStruct accessors.
534 Constant* ConstantStruct::get(const StructType* T,
535 const std::vector<Constant*>& V) {
536 LLVMContextImpl* pImpl = T->getContext().pImpl;
538 // Create a ConstantAggregateZero value if all elements are zeros...
539 for (unsigned i = 0, e = V.size(); i != e; ++i)
540 if (!V[i]->isNullValue())
541 // Implicitly locked.
542 return pImpl->StructConstants.getOrCreate(T, V);
544 return ConstantAggregateZero::get(T);
547 Constant* ConstantStruct::get(LLVMContext &Context,
548 const std::vector<Constant*>& V, bool packed) {
549 std::vector<const Type*> StructEls;
550 StructEls.reserve(V.size());
551 for (unsigned i = 0, e = V.size(); i != e; ++i)
552 StructEls.push_back(V[i]->getType());
553 return get(StructType::get(Context, StructEls, packed), V);
556 Constant* ConstantStruct::get(LLVMContext &Context,
557 Constant* const *Vals, unsigned NumVals,
559 // FIXME: make this the primary ctor method.
560 return get(Context, std::vector<Constant*>(Vals, Vals+NumVals), Packed);
563 ConstantVector::ConstantVector(const VectorType *T,
564 const std::vector<Constant*> &V)
565 : Constant(T, ConstantVectorVal,
566 OperandTraits<ConstantVector>::op_end(this) - V.size(),
568 Use *OL = OperandList;
569 for (std::vector<Constant*>::const_iterator I = V.begin(), E = V.end();
572 assert(C->getType() == T->getElementType() &&
573 "Initializer for vector element doesn't match vector element type!");
578 // ConstantVector accessors.
579 Constant* ConstantVector::get(const VectorType* T,
580 const std::vector<Constant*>& V) {
581 assert(!V.empty() && "Vectors can't be empty");
582 LLVMContext &Context = T->getContext();
583 LLVMContextImpl *pImpl = Context.pImpl;
585 // If this is an all-undef or alll-zero vector, return a
586 // ConstantAggregateZero or UndefValue.
588 bool isZero = C->isNullValue();
589 bool isUndef = isa<UndefValue>(C);
591 if (isZero || isUndef) {
592 for (unsigned i = 1, e = V.size(); i != e; ++i)
594 isZero = isUndef = false;
600 return ConstantAggregateZero::get(T);
602 return UndefValue::get(T);
604 // Implicitly locked.
605 return pImpl->VectorConstants.getOrCreate(T, V);
608 Constant* ConstantVector::get(const std::vector<Constant*>& V) {
609 assert(!V.empty() && "Cannot infer type if V is empty");
610 return get(VectorType::get(V.front()->getType(),V.size()), V);
613 Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
614 // FIXME: make this the primary ctor method.
615 return get(std::vector<Constant*>(Vals, Vals+NumVals));
618 Constant* ConstantExpr::getNSWAdd(Constant* C1, Constant* C2) {
619 return getTy(C1->getType(), Instruction::Add, C1, C2,
620 OverflowingBinaryOperator::NoSignedWrap);
623 Constant* ConstantExpr::getNSWSub(Constant* C1, Constant* C2) {
624 return getTy(C1->getType(), Instruction::Sub, C1, C2,
625 OverflowingBinaryOperator::NoSignedWrap);
628 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
629 return getTy(C1->getType(), Instruction::SDiv, C1, C2,
630 SDivOperator::IsExact);
633 // Utility function for determining if a ConstantExpr is a CastOp or not. This
634 // can't be inline because we don't want to #include Instruction.h into
636 bool ConstantExpr::isCast() const {
637 return Instruction::isCast(getOpcode());
640 bool ConstantExpr::isCompare() const {
641 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
644 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
645 if (getOpcode() != Instruction::GetElementPtr) return false;
647 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
648 User::const_op_iterator OI = next(this->op_begin());
650 // Skip the first index, as it has no static limit.
654 // The remaining indices must be compile-time known integers within the
655 // bounds of the corresponding notional static array types.
656 for (; GEPI != E; ++GEPI, ++OI) {
657 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
658 if (!CI) return false;
659 if (const ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
660 if (CI->getValue().getActiveBits() > 64 ||
661 CI->getZExtValue() >= ATy->getNumElements())
665 // All the indices checked out.
669 bool ConstantExpr::hasIndices() const {
670 return getOpcode() == Instruction::ExtractValue ||
671 getOpcode() == Instruction::InsertValue;
674 const SmallVector<unsigned, 4> &ConstantExpr::getIndices() const {
675 if (const ExtractValueConstantExpr *EVCE =
676 dyn_cast<ExtractValueConstantExpr>(this))
677 return EVCE->Indices;
679 return cast<InsertValueConstantExpr>(this)->Indices;
682 unsigned ConstantExpr::getPredicate() const {
683 assert(getOpcode() == Instruction::FCmp ||
684 getOpcode() == Instruction::ICmp);
685 return ((const CompareConstantExpr*)this)->predicate;
688 /// getWithOperandReplaced - Return a constant expression identical to this
689 /// one, but with the specified operand set to the specified value.
691 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
692 assert(OpNo < getNumOperands() && "Operand num is out of range!");
693 assert(Op->getType() == getOperand(OpNo)->getType() &&
694 "Replacing operand with value of different type!");
695 if (getOperand(OpNo) == Op)
696 return const_cast<ConstantExpr*>(this);
698 Constant *Op0, *Op1, *Op2;
699 switch (getOpcode()) {
700 case Instruction::Trunc:
701 case Instruction::ZExt:
702 case Instruction::SExt:
703 case Instruction::FPTrunc:
704 case Instruction::FPExt:
705 case Instruction::UIToFP:
706 case Instruction::SIToFP:
707 case Instruction::FPToUI:
708 case Instruction::FPToSI:
709 case Instruction::PtrToInt:
710 case Instruction::IntToPtr:
711 case Instruction::BitCast:
712 return ConstantExpr::getCast(getOpcode(), Op, getType());
713 case Instruction::Select:
714 Op0 = (OpNo == 0) ? Op : getOperand(0);
715 Op1 = (OpNo == 1) ? Op : getOperand(1);
716 Op2 = (OpNo == 2) ? Op : getOperand(2);
717 return ConstantExpr::getSelect(Op0, Op1, Op2);
718 case Instruction::InsertElement:
719 Op0 = (OpNo == 0) ? Op : getOperand(0);
720 Op1 = (OpNo == 1) ? Op : getOperand(1);
721 Op2 = (OpNo == 2) ? Op : getOperand(2);
722 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
723 case Instruction::ExtractElement:
724 Op0 = (OpNo == 0) ? Op : getOperand(0);
725 Op1 = (OpNo == 1) ? Op : getOperand(1);
726 return ConstantExpr::getExtractElement(Op0, Op1);
727 case Instruction::ShuffleVector:
728 Op0 = (OpNo == 0) ? Op : getOperand(0);
729 Op1 = (OpNo == 1) ? Op : getOperand(1);
730 Op2 = (OpNo == 2) ? Op : getOperand(2);
731 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
732 case Instruction::GetElementPtr: {
733 SmallVector<Constant*, 8> Ops;
734 Ops.resize(getNumOperands()-1);
735 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
736 Ops[i-1] = getOperand(i);
738 return cast<GEPOperator>(this)->isInBounds() ?
739 ConstantExpr::getInBoundsGetElementPtr(Op, &Ops[0], Ops.size()) :
740 ConstantExpr::getGetElementPtr(Op, &Ops[0], Ops.size());
742 return cast<GEPOperator>(this)->isInBounds() ?
743 ConstantExpr::getInBoundsGetElementPtr(getOperand(0), &Ops[0], Ops.size()) :
744 ConstantExpr::getGetElementPtr(getOperand(0), &Ops[0], Ops.size());
747 assert(getNumOperands() == 2 && "Must be binary operator?");
748 Op0 = (OpNo == 0) ? Op : getOperand(0);
749 Op1 = (OpNo == 1) ? Op : getOperand(1);
750 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassData);
754 /// getWithOperands - This returns the current constant expression with the
755 /// operands replaced with the specified values. The specified operands must
756 /// match count and type with the existing ones.
757 Constant *ConstantExpr::
758 getWithOperands(Constant* const *Ops, unsigned NumOps) const {
759 assert(NumOps == getNumOperands() && "Operand count mismatch!");
760 bool AnyChange = false;
761 for (unsigned i = 0; i != NumOps; ++i) {
762 assert(Ops[i]->getType() == getOperand(i)->getType() &&
763 "Operand type mismatch!");
764 AnyChange |= Ops[i] != getOperand(i);
766 if (!AnyChange) // No operands changed, return self.
767 return const_cast<ConstantExpr*>(this);
769 switch (getOpcode()) {
770 case Instruction::Trunc:
771 case Instruction::ZExt:
772 case Instruction::SExt:
773 case Instruction::FPTrunc:
774 case Instruction::FPExt:
775 case Instruction::UIToFP:
776 case Instruction::SIToFP:
777 case Instruction::FPToUI:
778 case Instruction::FPToSI:
779 case Instruction::PtrToInt:
780 case Instruction::IntToPtr:
781 case Instruction::BitCast:
782 return ConstantExpr::getCast(getOpcode(), Ops[0], getType());
783 case Instruction::Select:
784 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
785 case Instruction::InsertElement:
786 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
787 case Instruction::ExtractElement:
788 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
789 case Instruction::ShuffleVector:
790 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
791 case Instruction::GetElementPtr:
792 return cast<GEPOperator>(this)->isInBounds() ?
793 ConstantExpr::getInBoundsGetElementPtr(Ops[0], &Ops[1], NumOps-1) :
794 ConstantExpr::getGetElementPtr(Ops[0], &Ops[1], NumOps-1);
795 case Instruction::ICmp:
796 case Instruction::FCmp:
797 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
799 assert(getNumOperands() == 2 && "Must be binary operator?");
800 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassData);
805 //===----------------------------------------------------------------------===//
806 // isValueValidForType implementations
808 bool ConstantInt::isValueValidForType(const Type *Ty, uint64_t Val) {
809 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
810 if (Ty == Type::getInt1Ty(Ty->getContext()))
811 return Val == 0 || Val == 1;
813 return true; // always true, has to fit in largest type
814 uint64_t Max = (1ll << NumBits) - 1;
818 bool ConstantInt::isValueValidForType(const Type *Ty, int64_t Val) {
819 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
820 if (Ty == Type::getInt1Ty(Ty->getContext()))
821 return Val == 0 || Val == 1 || Val == -1;
823 return true; // always true, has to fit in largest type
824 int64_t Min = -(1ll << (NumBits-1));
825 int64_t Max = (1ll << (NumBits-1)) - 1;
826 return (Val >= Min && Val <= Max);
829 bool ConstantFP::isValueValidForType(const Type *Ty, const APFloat& Val) {
830 // convert modifies in place, so make a copy.
831 APFloat Val2 = APFloat(Val);
833 switch (Ty->getTypeID()) {
835 return false; // These can't be represented as floating point!
837 // FIXME rounding mode needs to be more flexible
838 case Type::FloatTyID: {
839 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
841 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
844 case Type::DoubleTyID: {
845 if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
846 &Val2.getSemantics() == &APFloat::IEEEdouble)
848 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
851 case Type::X86_FP80TyID:
852 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
853 &Val2.getSemantics() == &APFloat::IEEEdouble ||
854 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
855 case Type::FP128TyID:
856 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
857 &Val2.getSemantics() == &APFloat::IEEEdouble ||
858 &Val2.getSemantics() == &APFloat::IEEEquad;
859 case Type::PPC_FP128TyID:
860 return &Val2.getSemantics() == &APFloat::IEEEsingle ||
861 &Val2.getSemantics() == &APFloat::IEEEdouble ||
862 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
866 //===----------------------------------------------------------------------===//
867 // Factory Function Implementation
869 ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
870 assert((isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) &&
871 "Cannot create an aggregate zero of non-aggregate type!");
873 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
874 // Implicitly locked.
875 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
878 /// destroyConstant - Remove the constant from the constant table...
880 void ConstantAggregateZero::destroyConstant() {
881 // Implicitly locked.
882 getType()->getContext().pImpl->AggZeroConstants.remove(this);
883 destroyConstantImpl();
886 /// destroyConstant - Remove the constant from the constant table...
888 void ConstantArray::destroyConstant() {
889 // Implicitly locked.
890 getType()->getContext().pImpl->ArrayConstants.remove(this);
891 destroyConstantImpl();
894 /// isString - This method returns true if the array is an array of i8, and
895 /// if the elements of the array are all ConstantInt's.
896 bool ConstantArray::isString() const {
897 // Check the element type for i8...
898 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
900 // Check the elements to make sure they are all integers, not constant
902 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
903 if (!isa<ConstantInt>(getOperand(i)))
908 /// isCString - This method returns true if the array is a string (see
909 /// isString) and it ends in a null byte \\0 and does not contains any other
910 /// null bytes except its terminator.
911 bool ConstantArray::isCString() const {
912 // Check the element type for i8...
913 if (getType()->getElementType() != Type::getInt8Ty(getContext()))
916 // Last element must be a null.
917 if (!getOperand(getNumOperands()-1)->isNullValue())
919 // Other elements must be non-null integers.
920 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
921 if (!isa<ConstantInt>(getOperand(i)))
923 if (getOperand(i)->isNullValue())
930 /// getAsString - If the sub-element type of this array is i8
931 /// then this method converts the array to an std::string and returns it.
932 /// Otherwise, it asserts out.
934 std::string ConstantArray::getAsString() const {
935 assert(isString() && "Not a string!");
937 Result.reserve(getNumOperands());
938 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
939 Result.push_back((char)cast<ConstantInt>(getOperand(i))->getZExtValue());
944 //---- ConstantStruct::get() implementation...
951 // destroyConstant - Remove the constant from the constant table...
953 void ConstantStruct::destroyConstant() {
954 // Implicitly locked.
955 getType()->getContext().pImpl->StructConstants.remove(this);
956 destroyConstantImpl();
959 // destroyConstant - Remove the constant from the constant table...
961 void ConstantVector::destroyConstant() {
962 // Implicitly locked.
963 getType()->getContext().pImpl->VectorConstants.remove(this);
964 destroyConstantImpl();
967 /// This function will return true iff every element in this vector constant
968 /// is set to all ones.
969 /// @returns true iff this constant's emements are all set to all ones.
970 /// @brief Determine if the value is all ones.
971 bool ConstantVector::isAllOnesValue() const {
972 // Check out first element.
973 const Constant *Elt = getOperand(0);
974 const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
975 if (!CI || !CI->isAllOnesValue()) return false;
976 // Then make sure all remaining elements point to the same value.
977 for (unsigned I = 1, E = getNumOperands(); I < E; ++I) {
978 if (getOperand(I) != Elt) return false;
983 /// getSplatValue - If this is a splat constant, where all of the
984 /// elements have the same value, return that value. Otherwise return null.
985 Constant *ConstantVector::getSplatValue() {
986 // Check out first element.
987 Constant *Elt = getOperand(0);
988 // Then make sure all remaining elements point to the same value.
989 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
990 if (getOperand(I) != Elt) return 0;
994 //---- ConstantPointerNull::get() implementation.
997 ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
998 // Implicitly locked.
999 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1002 // destroyConstant - Remove the constant from the constant table...
1004 void ConstantPointerNull::destroyConstant() {
1005 // Implicitly locked.
1006 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1007 destroyConstantImpl();
1011 //---- UndefValue::get() implementation.
1014 UndefValue *UndefValue::get(const Type *Ty) {
1015 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1018 // destroyConstant - Remove the constant from the constant table.
1020 void UndefValue::destroyConstant() {
1021 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1022 destroyConstantImpl();
1025 //---- BlockAddress::get() implementation.
1028 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1029 assert(BB->getParent() != 0 && "Block must have a parent");
1030 return get(BB->getParent(), BB);
1033 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1035 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1037 BA = new BlockAddress(F, BB);
1039 assert(BA->getFunction() == F && "Basic block moved between functions");
1043 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1044 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1048 BB->AdjustBlockAddressRefCount(1);
1052 // destroyConstant - Remove the constant from the constant table.
1054 void BlockAddress::destroyConstant() {
1055 getFunction()->getType()->getContext().pImpl
1056 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1057 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1058 destroyConstantImpl();
1061 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1062 // This could be replacing either the Basic Block or the Function. In either
1063 // case, we have to remove the map entry.
1064 Function *NewF = getFunction();
1065 BasicBlock *NewBB = getBasicBlock();
1068 NewF = cast<Function>(To);
1070 NewBB = cast<BasicBlock>(To);
1072 // See if the 'new' entry already exists, if not, just update this in place
1073 // and return early.
1074 BlockAddress *&NewBA =
1075 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1077 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1079 // Remove the old entry, this can't cause the map to rehash (just a
1080 // tombstone will get added).
1081 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1084 setOperand(0, NewF);
1085 setOperand(1, NewBB);
1086 getBasicBlock()->AdjustBlockAddressRefCount(1);
1090 // Otherwise, I do need to replace this with an existing value.
1091 assert(NewBA != this && "I didn't contain From!");
1093 // Everyone using this now uses the replacement.
1094 uncheckedReplaceAllUsesWith(NewBA);
1099 //---- ConstantExpr::get() implementations.
1102 /// This is a utility function to handle folding of casts and lookup of the
1103 /// cast in the ExprConstants map. It is used by the various get* methods below.
1104 static inline Constant *getFoldedCast(
1105 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1106 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1107 // Fold a few common cases
1108 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1111 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1113 // Look up the constant in the table first to ensure uniqueness
1114 std::vector<Constant*> argVec(1, C);
1115 ExprMapKeyType Key(opc, argVec);
1117 // Implicitly locked.
1118 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1121 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1122 Instruction::CastOps opc = Instruction::CastOps(oc);
1123 assert(Instruction::isCast(opc) && "opcode out of range");
1124 assert(C && Ty && "Null arguments to getCast");
1125 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1129 llvm_unreachable("Invalid cast opcode");
1131 case Instruction::Trunc: return getTrunc(C, Ty);
1132 case Instruction::ZExt: return getZExt(C, Ty);
1133 case Instruction::SExt: return getSExt(C, Ty);
1134 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1135 case Instruction::FPExt: return getFPExtend(C, Ty);
1136 case Instruction::UIToFP: return getUIToFP(C, Ty);
1137 case Instruction::SIToFP: return getSIToFP(C, Ty);
1138 case Instruction::FPToUI: return getFPToUI(C, Ty);
1139 case Instruction::FPToSI: return getFPToSI(C, Ty);
1140 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1141 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1142 case Instruction::BitCast: return getBitCast(C, Ty);
1147 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1148 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1149 return getCast(Instruction::BitCast, C, Ty);
1150 return getCast(Instruction::ZExt, C, Ty);
1153 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1154 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1155 return getCast(Instruction::BitCast, C, Ty);
1156 return getCast(Instruction::SExt, C, Ty);
1159 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1160 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1161 return getCast(Instruction::BitCast, C, Ty);
1162 return getCast(Instruction::Trunc, C, Ty);
1165 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1166 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1167 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1169 if (Ty->isInteger())
1170 return getCast(Instruction::PtrToInt, S, Ty);
1171 return getCast(Instruction::BitCast, S, Ty);
1174 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1176 assert(C->getType()->isIntOrIntVector() &&
1177 Ty->isIntOrIntVector() && "Invalid cast");
1178 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1179 unsigned DstBits = Ty->getScalarSizeInBits();
1180 Instruction::CastOps opcode =
1181 (SrcBits == DstBits ? Instruction::BitCast :
1182 (SrcBits > DstBits ? Instruction::Trunc :
1183 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1184 return getCast(opcode, C, Ty);
1187 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1188 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1190 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1191 unsigned DstBits = Ty->getScalarSizeInBits();
1192 if (SrcBits == DstBits)
1193 return C; // Avoid a useless cast
1194 Instruction::CastOps opcode =
1195 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1196 return getCast(opcode, C, Ty);
1199 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1201 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1202 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1204 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1205 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1206 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1207 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1208 "SrcTy must be larger than DestTy for Trunc!");
1210 return getFoldedCast(Instruction::Trunc, C, Ty);
1213 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1215 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1216 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1218 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1219 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1220 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1221 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1222 "SrcTy must be smaller than DestTy for SExt!");
1224 return getFoldedCast(Instruction::SExt, C, Ty);
1227 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1229 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1230 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1232 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1233 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1234 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1235 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1236 "SrcTy must be smaller than DestTy for ZExt!");
1238 return getFoldedCast(Instruction::ZExt, C, Ty);
1241 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1243 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1244 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1246 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1247 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1248 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1249 "This is an illegal floating point truncation!");
1250 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1253 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1255 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1256 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1258 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1259 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1260 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1261 "This is an illegal floating point extension!");
1262 return getFoldedCast(Instruction::FPExt, C, Ty);
1265 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1267 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1268 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1270 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1271 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1272 "This is an illegal uint to floating point cast!");
1273 return getFoldedCast(Instruction::UIToFP, C, Ty);
1276 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1278 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1279 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1281 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1282 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1283 "This is an illegal sint to floating point cast!");
1284 return getFoldedCast(Instruction::SIToFP, C, Ty);
1287 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1289 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1290 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1292 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1293 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1294 "This is an illegal floating point to uint cast!");
1295 return getFoldedCast(Instruction::FPToUI, C, Ty);
1298 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1300 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1301 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1303 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1304 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1305 "This is an illegal floating point to sint cast!");
1306 return getFoldedCast(Instruction::FPToSI, C, Ty);
1309 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1310 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1311 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1312 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1315 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1316 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1317 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1318 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1321 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1322 // BitCast implies a no-op cast of type only. No bits change. However, you
1323 // can't cast pointers to anything but pointers.
1325 const Type *SrcTy = C->getType();
1326 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1327 "BitCast cannot cast pointer to non-pointer and vice versa");
1329 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1330 // or nonptr->ptr). For all the other types, the cast is okay if source and
1331 // destination bit widths are identical.
1332 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1333 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1335 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1337 // It is common to ask for a bitcast of a value to its own type, handle this
1339 if (C->getType() == DstTy) return C;
1341 return getFoldedCast(Instruction::BitCast, C, DstTy);
1344 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1345 Constant *C1, Constant *C2,
1347 // Check the operands for consistency first
1348 assert(Opcode >= Instruction::BinaryOpsBegin &&
1349 Opcode < Instruction::BinaryOpsEnd &&
1350 "Invalid opcode in binary constant expression");
1351 assert(C1->getType() == C2->getType() &&
1352 "Operand types in binary constant expression should match");
1354 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1355 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1357 return FC; // Fold a few common cases...
1359 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1360 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1362 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1364 // Implicitly locked.
1365 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1368 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1369 Constant *C1, Constant *C2) {
1370 switch (predicate) {
1371 default: llvm_unreachable("Invalid CmpInst predicate");
1372 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1373 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1374 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1375 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1376 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1377 case CmpInst::FCMP_TRUE:
1378 return getFCmp(predicate, C1, C2);
1380 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1381 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1382 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1383 case CmpInst::ICMP_SLE:
1384 return getICmp(predicate, C1, C2);
1388 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1390 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1391 if (C1->getType()->isFPOrFPVector()) {
1392 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1393 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1394 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1398 case Instruction::Add:
1399 case Instruction::Sub:
1400 case Instruction::Mul:
1401 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1402 assert(C1->getType()->isIntOrIntVector() &&
1403 "Tried to create an integer operation on a non-integer type!");
1405 case Instruction::FAdd:
1406 case Instruction::FSub:
1407 case Instruction::FMul:
1408 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1409 assert(C1->getType()->isFPOrFPVector() &&
1410 "Tried to create a floating-point operation on a "
1411 "non-floating-point type!");
1413 case Instruction::UDiv:
1414 case Instruction::SDiv:
1415 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1416 assert(C1->getType()->isIntOrIntVector() &&
1417 "Tried to create an arithmetic operation on a non-arithmetic type!");
1419 case Instruction::FDiv:
1420 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1421 assert(C1->getType()->isFPOrFPVector() &&
1422 "Tried to create an arithmetic operation on a non-arithmetic type!");
1424 case Instruction::URem:
1425 case Instruction::SRem:
1426 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1427 assert(C1->getType()->isIntOrIntVector() &&
1428 "Tried to create an arithmetic operation on a non-arithmetic type!");
1430 case Instruction::FRem:
1431 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1432 assert(C1->getType()->isFPOrFPVector() &&
1433 "Tried to create an arithmetic operation on a non-arithmetic type!");
1435 case Instruction::And:
1436 case Instruction::Or:
1437 case Instruction::Xor:
1438 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1439 assert(C1->getType()->isIntOrIntVector() &&
1440 "Tried to create a logical operation on a non-integral type!");
1442 case Instruction::Shl:
1443 case Instruction::LShr:
1444 case Instruction::AShr:
1445 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1446 assert(C1->getType()->isIntOrIntVector() &&
1447 "Tried to create a shift operation on a non-integer type!");
1454 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1457 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1458 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1459 // Note that a non-inbounds gep is used, as null isn't within any object.
1460 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1461 Constant *GEP = getGetElementPtr(
1462 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1463 return getCast(Instruction::PtrToInt, GEP,
1464 Type::getInt64Ty(Ty->getContext()));
1467 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1468 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1469 // Note that a non-inbounds gep is used, as null isn't within any object.
1470 const Type *AligningTy = StructType::get(Ty->getContext(),
1471 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1472 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1473 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1474 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1475 Constant *Indices[2] = { Zero, One };
1476 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1477 return getCast(Instruction::PtrToInt, GEP,
1478 Type::getInt32Ty(Ty->getContext()));
1481 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1482 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1483 // Note that a non-inbounds gep is used, as null isn't within any object.
1484 Constant *GEPIdx[] = {
1485 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1486 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1488 Constant *GEP = getGetElementPtr(
1489 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1490 return getCast(Instruction::PtrToInt, GEP,
1491 Type::getInt64Ty(STy->getContext()));
1494 Constant *ConstantExpr::getCompare(unsigned short pred,
1495 Constant *C1, Constant *C2) {
1496 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1497 return getCompareTy(pred, C1, C2);
1500 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1501 Constant *V1, Constant *V2) {
1502 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1504 if (ReqTy == V1->getType())
1505 if (Constant *SC = ConstantFoldSelectInstruction(
1506 ReqTy->getContext(), C, V1, V2))
1507 return SC; // Fold common cases
1509 std::vector<Constant*> argVec(3, C);
1512 ExprMapKeyType Key(Instruction::Select, argVec);
1514 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1516 // Implicitly locked.
1517 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1520 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1523 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1525 cast<PointerType>(ReqTy)->getElementType() &&
1526 "GEP indices invalid!");
1528 if (Constant *FC = ConstantFoldGetElementPtr(
1529 ReqTy->getContext(), C, /*inBounds=*/false,
1530 (Constant**)Idxs, NumIdx))
1531 return FC; // Fold a few common cases...
1533 assert(isa<PointerType>(C->getType()) &&
1534 "Non-pointer type for constant GetElementPtr expression");
1535 // Look up the constant in the table first to ensure uniqueness
1536 std::vector<Constant*> ArgVec;
1537 ArgVec.reserve(NumIdx+1);
1538 ArgVec.push_back(C);
1539 for (unsigned i = 0; i != NumIdx; ++i)
1540 ArgVec.push_back(cast<Constant>(Idxs[i]));
1541 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1543 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1545 // Implicitly locked.
1546 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1549 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1553 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1555 cast<PointerType>(ReqTy)->getElementType() &&
1556 "GEP indices invalid!");
1558 if (Constant *FC = ConstantFoldGetElementPtr(
1559 ReqTy->getContext(), C, /*inBounds=*/true,
1560 (Constant**)Idxs, NumIdx))
1561 return FC; // Fold a few common cases...
1563 assert(isa<PointerType>(C->getType()) &&
1564 "Non-pointer type for constant GetElementPtr expression");
1565 // Look up the constant in the table first to ensure uniqueness
1566 std::vector<Constant*> ArgVec;
1567 ArgVec.reserve(NumIdx+1);
1568 ArgVec.push_back(C);
1569 for (unsigned i = 0; i != NumIdx; ++i)
1570 ArgVec.push_back(cast<Constant>(Idxs[i]));
1571 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1572 GEPOperator::IsInBounds);
1574 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1576 // Implicitly locked.
1577 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1580 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1582 // Get the result type of the getelementptr!
1584 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1585 assert(Ty && "GEP indices invalid!");
1586 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1587 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1590 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1593 // Get the result type of the getelementptr!
1595 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1596 assert(Ty && "GEP indices invalid!");
1597 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1598 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1601 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1603 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1606 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1607 Constant* const *Idxs,
1609 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1613 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1614 assert(LHS->getType() == RHS->getType());
1615 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1616 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1618 if (Constant *FC = ConstantFoldCompareInstruction(
1619 LHS->getContext(), pred, LHS, RHS))
1620 return FC; // Fold a few common cases...
1622 // Look up the constant in the table first to ensure uniqueness
1623 std::vector<Constant*> ArgVec;
1624 ArgVec.push_back(LHS);
1625 ArgVec.push_back(RHS);
1626 // Get the key type with both the opcode and predicate
1627 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1629 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1631 // Implicitly locked.
1633 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1637 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1638 assert(LHS->getType() == RHS->getType());
1639 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1641 if (Constant *FC = ConstantFoldCompareInstruction(
1642 LHS->getContext(), pred, LHS, RHS))
1643 return FC; // Fold a few common cases...
1645 // Look up the constant in the table first to ensure uniqueness
1646 std::vector<Constant*> ArgVec;
1647 ArgVec.push_back(LHS);
1648 ArgVec.push_back(RHS);
1649 // Get the key type with both the opcode and predicate
1650 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1652 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1654 // Implicitly locked.
1656 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1659 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1661 if (Constant *FC = ConstantFoldExtractElementInstruction(
1662 ReqTy->getContext(), Val, Idx))
1663 return FC; // Fold a few common cases...
1664 // Look up the constant in the table first to ensure uniqueness
1665 std::vector<Constant*> ArgVec(1, Val);
1666 ArgVec.push_back(Idx);
1667 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1669 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1671 // Implicitly locked.
1672 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1675 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1676 assert(isa<VectorType>(Val->getType()) &&
1677 "Tried to create extractelement operation on non-vector type!");
1678 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1679 "Extractelement index must be i32 type!");
1680 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1684 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1685 Constant *Elt, Constant *Idx) {
1686 if (Constant *FC = ConstantFoldInsertElementInstruction(
1687 ReqTy->getContext(), Val, Elt, Idx))
1688 return FC; // Fold a few common cases...
1689 // Look up the constant in the table first to ensure uniqueness
1690 std::vector<Constant*> ArgVec(1, Val);
1691 ArgVec.push_back(Elt);
1692 ArgVec.push_back(Idx);
1693 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1695 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1697 // Implicitly locked.
1698 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1701 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1703 assert(isa<VectorType>(Val->getType()) &&
1704 "Tried to create insertelement operation on non-vector type!");
1705 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1706 && "Insertelement types must match!");
1707 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1708 "Insertelement index must be i32 type!");
1709 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1712 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1713 Constant *V2, Constant *Mask) {
1714 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1715 ReqTy->getContext(), V1, V2, Mask))
1716 return FC; // Fold a few common cases...
1717 // Look up the constant in the table first to ensure uniqueness
1718 std::vector<Constant*> ArgVec(1, V1);
1719 ArgVec.push_back(V2);
1720 ArgVec.push_back(Mask);
1721 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1723 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1725 // Implicitly locked.
1726 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1729 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1731 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1732 "Invalid shuffle vector constant expr operands!");
1734 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1735 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1736 const Type *ShufTy = VectorType::get(EltTy, NElts);
1737 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1740 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1742 const unsigned *Idxs, unsigned NumIdx) {
1743 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1744 Idxs+NumIdx) == Val->getType() &&
1745 "insertvalue indices invalid!");
1746 assert(Agg->getType() == ReqTy &&
1747 "insertvalue type invalid!");
1748 assert(Agg->getType()->isFirstClassType() &&
1749 "Non-first-class type for constant InsertValue expression");
1750 Constant *FC = ConstantFoldInsertValueInstruction(
1751 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1752 assert(FC && "InsertValue constant expr couldn't be folded!");
1756 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1757 const unsigned *IdxList, unsigned NumIdx) {
1758 assert(Agg->getType()->isFirstClassType() &&
1759 "Tried to create insertelement operation on non-first-class type!");
1761 const Type *ReqTy = Agg->getType();
1764 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1766 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1767 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1770 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1771 const unsigned *Idxs, unsigned NumIdx) {
1772 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1773 Idxs+NumIdx) == ReqTy &&
1774 "extractvalue indices invalid!");
1775 assert(Agg->getType()->isFirstClassType() &&
1776 "Non-first-class type for constant extractvalue expression");
1777 Constant *FC = ConstantFoldExtractValueInstruction(
1778 ReqTy->getContext(), Agg, Idxs, NumIdx);
1779 assert(FC && "ExtractValue constant expr couldn't be folded!");
1783 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1784 const unsigned *IdxList, unsigned NumIdx) {
1785 assert(Agg->getType()->isFirstClassType() &&
1786 "Tried to create extractelement operation on non-first-class type!");
1789 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1790 assert(ReqTy && "extractvalue indices invalid!");
1791 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1794 Constant* ConstantExpr::getNeg(Constant* C) {
1795 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1796 if (C->getType()->isFPOrFPVector())
1798 assert(C->getType()->isIntOrIntVector() &&
1799 "Cannot NEG a nonintegral value!");
1800 return get(Instruction::Sub,
1801 ConstantFP::getZeroValueForNegation(C->getType()),
1805 Constant* ConstantExpr::getFNeg(Constant* C) {
1806 assert(C->getType()->isFPOrFPVector() &&
1807 "Cannot FNEG a non-floating-point value!");
1808 return get(Instruction::FSub,
1809 ConstantFP::getZeroValueForNegation(C->getType()),
1813 Constant* ConstantExpr::getNot(Constant* C) {
1814 assert(C->getType()->isIntOrIntVector() &&
1815 "Cannot NOT a nonintegral value!");
1816 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1819 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1820 return get(Instruction::Add, C1, C2);
1823 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1824 return get(Instruction::FAdd, C1, C2);
1827 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1828 return get(Instruction::Sub, C1, C2);
1831 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1832 return get(Instruction::FSub, C1, C2);
1835 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1836 return get(Instruction::Mul, C1, C2);
1839 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1840 return get(Instruction::FMul, C1, C2);
1843 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1844 return get(Instruction::UDiv, C1, C2);
1847 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1848 return get(Instruction::SDiv, C1, C2);
1851 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1852 return get(Instruction::FDiv, C1, C2);
1855 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1856 return get(Instruction::URem, C1, C2);
1859 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1860 return get(Instruction::SRem, C1, C2);
1863 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1864 return get(Instruction::FRem, C1, C2);
1867 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1868 return get(Instruction::And, C1, C2);
1871 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1872 return get(Instruction::Or, C1, C2);
1875 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1876 return get(Instruction::Xor, C1, C2);
1879 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1880 return get(Instruction::Shl, C1, C2);
1883 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1884 return get(Instruction::LShr, C1, C2);
1887 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1888 return get(Instruction::AShr, C1, C2);
1891 // destroyConstant - Remove the constant from the constant table...
1893 void ConstantExpr::destroyConstant() {
1894 // Implicitly locked.
1895 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1896 pImpl->ExprConstants.remove(this);
1897 destroyConstantImpl();
1900 const char *ConstantExpr::getOpcodeName() const {
1901 return Instruction::getOpcodeName(getOpcode());
1904 //===----------------------------------------------------------------------===//
1905 // replaceUsesOfWithOnConstant implementations
1907 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1908 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1911 /// Note that we intentionally replace all uses of From with To here. Consider
1912 /// a large array that uses 'From' 1000 times. By handling this case all here,
1913 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1914 /// single invocation handles all 1000 uses. Handling them one at a time would
1915 /// work, but would be really slow because it would have to unique each updated
1918 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1920 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1921 Constant *ToC = cast<Constant>(To);
1923 LLVMContext &Context = getType()->getContext();
1924 LLVMContextImpl *pImpl = Context.pImpl;
1926 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1927 Lookup.first.first = getType();
1928 Lookup.second = this;
1930 std::vector<Constant*> &Values = Lookup.first.second;
1931 Values.reserve(getNumOperands()); // Build replacement array.
1933 // Fill values with the modified operands of the constant array. Also,
1934 // compute whether this turns into an all-zeros array.
1935 bool isAllZeros = false;
1936 unsigned NumUpdated = 0;
1937 if (!ToC->isNullValue()) {
1938 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1939 Constant *Val = cast<Constant>(O->get());
1944 Values.push_back(Val);
1948 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1949 Constant *Val = cast<Constant>(O->get());
1954 Values.push_back(Val);
1955 if (isAllZeros) isAllZeros = Val->isNullValue();
1959 Constant *Replacement = 0;
1961 Replacement = ConstantAggregateZero::get(getType());
1963 // Check to see if we have this array type already.
1965 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1966 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1969 Replacement = I->second;
1971 // Okay, the new shape doesn't exist in the system yet. Instead of
1972 // creating a new constant array, inserting it, replaceallusesof'ing the
1973 // old with the new, then deleting the old... just update the current one
1975 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1977 // Update to the new value. Optimize for the case when we have a single
1978 // operand that we're changing, but handle bulk updates efficiently.
1979 if (NumUpdated == 1) {
1980 unsigned OperandToUpdate = U - OperandList;
1981 assert(getOperand(OperandToUpdate) == From &&
1982 "ReplaceAllUsesWith broken!");
1983 setOperand(OperandToUpdate, ToC);
1985 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1986 if (getOperand(i) == From)
1993 // Otherwise, I do need to replace this with an existing value.
1994 assert(Replacement != this && "I didn't contain From!");
1996 // Everyone using this now uses the replacement.
1997 uncheckedReplaceAllUsesWith(Replacement);
1999 // Delete the old constant!
2003 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2005 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2006 Constant *ToC = cast<Constant>(To);
2008 unsigned OperandToUpdate = U-OperandList;
2009 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2011 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2012 Lookup.first.first = getType();
2013 Lookup.second = this;
2014 std::vector<Constant*> &Values = Lookup.first.second;
2015 Values.reserve(getNumOperands()); // Build replacement struct.
2018 // Fill values with the modified operands of the constant struct. Also,
2019 // compute whether this turns into an all-zeros struct.
2020 bool isAllZeros = false;
2021 if (!ToC->isNullValue()) {
2022 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2023 Values.push_back(cast<Constant>(O->get()));
2026 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2027 Constant *Val = cast<Constant>(O->get());
2028 Values.push_back(Val);
2029 if (isAllZeros) isAllZeros = Val->isNullValue();
2032 Values[OperandToUpdate] = ToC;
2034 LLVMContext &Context = getType()->getContext();
2035 LLVMContextImpl *pImpl = Context.pImpl;
2037 Constant *Replacement = 0;
2039 Replacement = ConstantAggregateZero::get(getType());
2041 // Check to see if we have this array type already.
2043 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2044 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2047 Replacement = I->second;
2049 // Okay, the new shape doesn't exist in the system yet. Instead of
2050 // creating a new constant struct, inserting it, replaceallusesof'ing the
2051 // old with the new, then deleting the old... just update the current one
2053 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2055 // Update to the new value.
2056 setOperand(OperandToUpdate, ToC);
2061 assert(Replacement != this && "I didn't contain From!");
2063 // Everyone using this now uses the replacement.
2064 uncheckedReplaceAllUsesWith(Replacement);
2066 // Delete the old constant!
2070 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2072 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2074 std::vector<Constant*> Values;
2075 Values.reserve(getNumOperands()); // Build replacement array...
2076 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2077 Constant *Val = getOperand(i);
2078 if (Val == From) Val = cast<Constant>(To);
2079 Values.push_back(Val);
2082 Constant *Replacement = get(getType(), Values);
2083 assert(Replacement != this && "I didn't contain From!");
2085 // Everyone using this now uses the replacement.
2086 uncheckedReplaceAllUsesWith(Replacement);
2088 // Delete the old constant!
2092 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2094 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2095 Constant *To = cast<Constant>(ToV);
2097 Constant *Replacement = 0;
2098 if (getOpcode() == Instruction::GetElementPtr) {
2099 SmallVector<Constant*, 8> Indices;
2100 Constant *Pointer = getOperand(0);
2101 Indices.reserve(getNumOperands()-1);
2102 if (Pointer == From) Pointer = To;
2104 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2105 Constant *Val = getOperand(i);
2106 if (Val == From) Val = To;
2107 Indices.push_back(Val);
2109 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2110 &Indices[0], Indices.size());
2111 } else if (getOpcode() == Instruction::ExtractValue) {
2112 Constant *Agg = getOperand(0);
2113 if (Agg == From) Agg = To;
2115 const SmallVector<unsigned, 4> &Indices = getIndices();
2116 Replacement = ConstantExpr::getExtractValue(Agg,
2117 &Indices[0], Indices.size());
2118 } else if (getOpcode() == Instruction::InsertValue) {
2119 Constant *Agg = getOperand(0);
2120 Constant *Val = getOperand(1);
2121 if (Agg == From) Agg = To;
2122 if (Val == From) Val = To;
2124 const SmallVector<unsigned, 4> &Indices = getIndices();
2125 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2126 &Indices[0], Indices.size());
2127 } else if (isCast()) {
2128 assert(getOperand(0) == From && "Cast only has one use!");
2129 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2130 } else if (getOpcode() == Instruction::Select) {
2131 Constant *C1 = getOperand(0);
2132 Constant *C2 = getOperand(1);
2133 Constant *C3 = getOperand(2);
2134 if (C1 == From) C1 = To;
2135 if (C2 == From) C2 = To;
2136 if (C3 == From) C3 = To;
2137 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2138 } else if (getOpcode() == Instruction::ExtractElement) {
2139 Constant *C1 = getOperand(0);
2140 Constant *C2 = getOperand(1);
2141 if (C1 == From) C1 = To;
2142 if (C2 == From) C2 = To;
2143 Replacement = ConstantExpr::getExtractElement(C1, C2);
2144 } else if (getOpcode() == Instruction::InsertElement) {
2145 Constant *C1 = getOperand(0);
2146 Constant *C2 = getOperand(1);
2147 Constant *C3 = getOperand(1);
2148 if (C1 == From) C1 = To;
2149 if (C2 == From) C2 = To;
2150 if (C3 == From) C3 = To;
2151 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2152 } else if (getOpcode() == Instruction::ShuffleVector) {
2153 Constant *C1 = getOperand(0);
2154 Constant *C2 = getOperand(1);
2155 Constant *C3 = getOperand(2);
2156 if (C1 == From) C1 = To;
2157 if (C2 == From) C2 = To;
2158 if (C3 == From) C3 = To;
2159 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2160 } else if (isCompare()) {
2161 Constant *C1 = getOperand(0);
2162 Constant *C2 = getOperand(1);
2163 if (C1 == From) C1 = To;
2164 if (C2 == From) C2 = To;
2165 if (getOpcode() == Instruction::ICmp)
2166 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2168 assert(getOpcode() == Instruction::FCmp);
2169 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2171 } else if (getNumOperands() == 2) {
2172 Constant *C1 = getOperand(0);
2173 Constant *C2 = getOperand(1);
2174 if (C1 == From) C1 = To;
2175 if (C2 == From) C2 = To;
2176 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassData);
2178 llvm_unreachable("Unknown ConstantExpr type!");
2182 assert(Replacement != this && "I didn't contain From!");
2184 // Everyone using this now uses the replacement.
2185 uncheckedReplaceAllUsesWith(Replacement);
2187 // Delete the old constant!