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 if (BB) 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 if (BasicBlock *BB = getBasicBlock())
1058 BB->AdjustBlockAddressRefCount(-1);
1059 destroyConstantImpl();
1062 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1063 // This could be replacing either the Basic Block or the Function. In either
1064 // case, we have to remove the map entry.
1065 Function *NewF = getFunction();
1066 BasicBlock *NewBB = getBasicBlock();
1069 NewF = cast<Function>(To);
1071 NewBB = cast<BasicBlock>(To);
1073 // See if the 'new' entry already exists, if not, just update this in place
1074 // and return early.
1075 BlockAddress *&NewBA =
1076 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1078 // Remove the old entry, this can't cause the map to rehash (just a
1079 // tombstone will get added).
1080 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1088 // Otherwise, I do need to replace this with an existing value.
1089 assert(NewBA != this && "I didn't contain From!");
1091 // Everyone using this now uses the replacement.
1092 uncheckedReplaceAllUsesWith(NewBA);
1097 //---- ConstantExpr::get() implementations.
1100 /// This is a utility function to handle folding of casts and lookup of the
1101 /// cast in the ExprConstants map. It is used by the various get* methods below.
1102 static inline Constant *getFoldedCast(
1103 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1104 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1105 // Fold a few common cases
1106 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1109 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1111 // Look up the constant in the table first to ensure uniqueness
1112 std::vector<Constant*> argVec(1, C);
1113 ExprMapKeyType Key(opc, argVec);
1115 // Implicitly locked.
1116 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1119 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1120 Instruction::CastOps opc = Instruction::CastOps(oc);
1121 assert(Instruction::isCast(opc) && "opcode out of range");
1122 assert(C && Ty && "Null arguments to getCast");
1123 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1127 llvm_unreachable("Invalid cast opcode");
1129 case Instruction::Trunc: return getTrunc(C, Ty);
1130 case Instruction::ZExt: return getZExt(C, Ty);
1131 case Instruction::SExt: return getSExt(C, Ty);
1132 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1133 case Instruction::FPExt: return getFPExtend(C, Ty);
1134 case Instruction::UIToFP: return getUIToFP(C, Ty);
1135 case Instruction::SIToFP: return getSIToFP(C, Ty);
1136 case Instruction::FPToUI: return getFPToUI(C, Ty);
1137 case Instruction::FPToSI: return getFPToSI(C, Ty);
1138 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1139 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1140 case Instruction::BitCast: return getBitCast(C, Ty);
1145 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1146 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1147 return getCast(Instruction::BitCast, C, Ty);
1148 return getCast(Instruction::ZExt, C, Ty);
1151 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1152 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1153 return getCast(Instruction::BitCast, C, Ty);
1154 return getCast(Instruction::SExt, C, Ty);
1157 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1158 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1159 return getCast(Instruction::BitCast, C, Ty);
1160 return getCast(Instruction::Trunc, C, Ty);
1163 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1164 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1165 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1167 if (Ty->isInteger())
1168 return getCast(Instruction::PtrToInt, S, Ty);
1169 return getCast(Instruction::BitCast, S, Ty);
1172 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1174 assert(C->getType()->isIntOrIntVector() &&
1175 Ty->isIntOrIntVector() && "Invalid cast");
1176 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1177 unsigned DstBits = Ty->getScalarSizeInBits();
1178 Instruction::CastOps opcode =
1179 (SrcBits == DstBits ? Instruction::BitCast :
1180 (SrcBits > DstBits ? Instruction::Trunc :
1181 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1182 return getCast(opcode, C, Ty);
1185 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1186 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1188 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1189 unsigned DstBits = Ty->getScalarSizeInBits();
1190 if (SrcBits == DstBits)
1191 return C; // Avoid a useless cast
1192 Instruction::CastOps opcode =
1193 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1194 return getCast(opcode, C, Ty);
1197 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1199 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1200 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1202 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1203 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1204 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1205 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1206 "SrcTy must be larger than DestTy for Trunc!");
1208 return getFoldedCast(Instruction::Trunc, C, Ty);
1211 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1213 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1214 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1216 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1217 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1218 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1219 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1220 "SrcTy must be smaller than DestTy for SExt!");
1222 return getFoldedCast(Instruction::SExt, C, Ty);
1225 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1227 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1228 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1230 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1231 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1232 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1233 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1234 "SrcTy must be smaller than DestTy for ZExt!");
1236 return getFoldedCast(Instruction::ZExt, C, Ty);
1239 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1241 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1242 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1244 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1245 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1246 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1247 "This is an illegal floating point truncation!");
1248 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1251 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1253 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1254 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1256 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1257 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1258 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1259 "This is an illegal floating point extension!");
1260 return getFoldedCast(Instruction::FPExt, C, Ty);
1263 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1265 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1266 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1268 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1269 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1270 "This is an illegal uint to floating point cast!");
1271 return getFoldedCast(Instruction::UIToFP, C, Ty);
1274 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1276 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1277 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1279 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1280 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1281 "This is an illegal sint to floating point cast!");
1282 return getFoldedCast(Instruction::SIToFP, C, Ty);
1285 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1287 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1288 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1290 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1291 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1292 "This is an illegal floating point to uint cast!");
1293 return getFoldedCast(Instruction::FPToUI, C, Ty);
1296 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1298 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1299 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1301 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1302 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1303 "This is an illegal floating point to sint cast!");
1304 return getFoldedCast(Instruction::FPToSI, C, Ty);
1307 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1308 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1309 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1310 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1313 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1314 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1315 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1316 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1319 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1320 // BitCast implies a no-op cast of type only. No bits change. However, you
1321 // can't cast pointers to anything but pointers.
1323 const Type *SrcTy = C->getType();
1324 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1325 "BitCast cannot cast pointer to non-pointer and vice versa");
1327 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1328 // or nonptr->ptr). For all the other types, the cast is okay if source and
1329 // destination bit widths are identical.
1330 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1331 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1333 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1335 // It is common to ask for a bitcast of a value to its own type, handle this
1337 if (C->getType() == DstTy) return C;
1339 return getFoldedCast(Instruction::BitCast, C, DstTy);
1342 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1343 Constant *C1, Constant *C2,
1345 // Check the operands for consistency first
1346 assert(Opcode >= Instruction::BinaryOpsBegin &&
1347 Opcode < Instruction::BinaryOpsEnd &&
1348 "Invalid opcode in binary constant expression");
1349 assert(C1->getType() == C2->getType() &&
1350 "Operand types in binary constant expression should match");
1352 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1353 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1355 return FC; // Fold a few common cases...
1357 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1358 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1360 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1362 // Implicitly locked.
1363 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1366 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1367 Constant *C1, Constant *C2) {
1368 switch (predicate) {
1369 default: llvm_unreachable("Invalid CmpInst predicate");
1370 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1371 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1372 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1373 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1374 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1375 case CmpInst::FCMP_TRUE:
1376 return getFCmp(predicate, C1, C2);
1378 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1379 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1380 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1381 case CmpInst::ICMP_SLE:
1382 return getICmp(predicate, C1, C2);
1386 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1388 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1389 if (C1->getType()->isFPOrFPVector()) {
1390 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1391 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1392 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1396 case Instruction::Add:
1397 case Instruction::Sub:
1398 case Instruction::Mul:
1399 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1400 assert(C1->getType()->isIntOrIntVector() &&
1401 "Tried to create an integer operation on a non-integer type!");
1403 case Instruction::FAdd:
1404 case Instruction::FSub:
1405 case Instruction::FMul:
1406 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1407 assert(C1->getType()->isFPOrFPVector() &&
1408 "Tried to create a floating-point operation on a "
1409 "non-floating-point type!");
1411 case Instruction::UDiv:
1412 case Instruction::SDiv:
1413 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1414 assert(C1->getType()->isIntOrIntVector() &&
1415 "Tried to create an arithmetic operation on a non-arithmetic type!");
1417 case Instruction::FDiv:
1418 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1419 assert(C1->getType()->isFPOrFPVector() &&
1420 "Tried to create an arithmetic operation on a non-arithmetic type!");
1422 case Instruction::URem:
1423 case Instruction::SRem:
1424 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1425 assert(C1->getType()->isIntOrIntVector() &&
1426 "Tried to create an arithmetic operation on a non-arithmetic type!");
1428 case Instruction::FRem:
1429 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1430 assert(C1->getType()->isFPOrFPVector() &&
1431 "Tried to create an arithmetic operation on a non-arithmetic type!");
1433 case Instruction::And:
1434 case Instruction::Or:
1435 case Instruction::Xor:
1436 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1437 assert(C1->getType()->isIntOrIntVector() &&
1438 "Tried to create a logical operation on a non-integral type!");
1440 case Instruction::Shl:
1441 case Instruction::LShr:
1442 case Instruction::AShr:
1443 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1444 assert(C1->getType()->isIntOrIntVector() &&
1445 "Tried to create a shift operation on a non-integer type!");
1452 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1455 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1456 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1457 // Note that a non-inbounds gep is used, as null isn't within any object.
1458 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1459 Constant *GEP = getGetElementPtr(
1460 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1461 return getCast(Instruction::PtrToInt, GEP,
1462 Type::getInt64Ty(Ty->getContext()));
1465 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1466 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1467 // Note that a non-inbounds gep is used, as null isn't within any object.
1468 const Type *AligningTy = StructType::get(Ty->getContext(),
1469 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1470 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1471 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1472 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1473 Constant *Indices[2] = { Zero, One };
1474 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1475 return getCast(Instruction::PtrToInt, GEP,
1476 Type::getInt32Ty(Ty->getContext()));
1479 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1480 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1481 // Note that a non-inbounds gep is used, as null isn't within any object.
1482 Constant *GEPIdx[] = {
1483 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1484 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1486 Constant *GEP = getGetElementPtr(
1487 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1488 return getCast(Instruction::PtrToInt, GEP,
1489 Type::getInt64Ty(STy->getContext()));
1492 Constant *ConstantExpr::getCompare(unsigned short pred,
1493 Constant *C1, Constant *C2) {
1494 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1495 return getCompareTy(pred, C1, C2);
1498 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1499 Constant *V1, Constant *V2) {
1500 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1502 if (ReqTy == V1->getType())
1503 if (Constant *SC = ConstantFoldSelectInstruction(
1504 ReqTy->getContext(), C, V1, V2))
1505 return SC; // Fold common cases
1507 std::vector<Constant*> argVec(3, C);
1510 ExprMapKeyType Key(Instruction::Select, argVec);
1512 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1514 // Implicitly locked.
1515 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1518 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1521 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1523 cast<PointerType>(ReqTy)->getElementType() &&
1524 "GEP indices invalid!");
1526 if (Constant *FC = ConstantFoldGetElementPtr(
1527 ReqTy->getContext(), C, /*inBounds=*/false,
1528 (Constant**)Idxs, NumIdx))
1529 return FC; // Fold a few common cases...
1531 assert(isa<PointerType>(C->getType()) &&
1532 "Non-pointer type for constant GetElementPtr expression");
1533 // Look up the constant in the table first to ensure uniqueness
1534 std::vector<Constant*> ArgVec;
1535 ArgVec.reserve(NumIdx+1);
1536 ArgVec.push_back(C);
1537 for (unsigned i = 0; i != NumIdx; ++i)
1538 ArgVec.push_back(cast<Constant>(Idxs[i]));
1539 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1541 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1543 // Implicitly locked.
1544 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1547 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1551 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1553 cast<PointerType>(ReqTy)->getElementType() &&
1554 "GEP indices invalid!");
1556 if (Constant *FC = ConstantFoldGetElementPtr(
1557 ReqTy->getContext(), C, /*inBounds=*/true,
1558 (Constant**)Idxs, NumIdx))
1559 return FC; // Fold a few common cases...
1561 assert(isa<PointerType>(C->getType()) &&
1562 "Non-pointer type for constant GetElementPtr expression");
1563 // Look up the constant in the table first to ensure uniqueness
1564 std::vector<Constant*> ArgVec;
1565 ArgVec.reserve(NumIdx+1);
1566 ArgVec.push_back(C);
1567 for (unsigned i = 0; i != NumIdx; ++i)
1568 ArgVec.push_back(cast<Constant>(Idxs[i]));
1569 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1570 GEPOperator::IsInBounds);
1572 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1574 // Implicitly locked.
1575 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1578 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1580 // Get the result type of the getelementptr!
1582 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1583 assert(Ty && "GEP indices invalid!");
1584 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1585 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1588 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1591 // Get the result type of the getelementptr!
1593 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1594 assert(Ty && "GEP indices invalid!");
1595 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1596 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1599 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1601 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1604 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1605 Constant* const *Idxs,
1607 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1611 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1612 assert(LHS->getType() == RHS->getType());
1613 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1614 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1616 if (Constant *FC = ConstantFoldCompareInstruction(
1617 LHS->getContext(), pred, LHS, RHS))
1618 return FC; // Fold a few common cases...
1620 // Look up the constant in the table first to ensure uniqueness
1621 std::vector<Constant*> ArgVec;
1622 ArgVec.push_back(LHS);
1623 ArgVec.push_back(RHS);
1624 // Get the key type with both the opcode and predicate
1625 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1627 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1629 // Implicitly locked.
1631 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1635 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1636 assert(LHS->getType() == RHS->getType());
1637 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1639 if (Constant *FC = ConstantFoldCompareInstruction(
1640 LHS->getContext(), pred, LHS, RHS))
1641 return FC; // Fold a few common cases...
1643 // Look up the constant in the table first to ensure uniqueness
1644 std::vector<Constant*> ArgVec;
1645 ArgVec.push_back(LHS);
1646 ArgVec.push_back(RHS);
1647 // Get the key type with both the opcode and predicate
1648 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1650 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1652 // Implicitly locked.
1654 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1657 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1659 if (Constant *FC = ConstantFoldExtractElementInstruction(
1660 ReqTy->getContext(), Val, Idx))
1661 return FC; // Fold a few common cases...
1662 // Look up the constant in the table first to ensure uniqueness
1663 std::vector<Constant*> ArgVec(1, Val);
1664 ArgVec.push_back(Idx);
1665 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1667 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1669 // Implicitly locked.
1670 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1673 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1674 assert(isa<VectorType>(Val->getType()) &&
1675 "Tried to create extractelement operation on non-vector type!");
1676 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1677 "Extractelement index must be i32 type!");
1678 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1682 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1683 Constant *Elt, Constant *Idx) {
1684 if (Constant *FC = ConstantFoldInsertElementInstruction(
1685 ReqTy->getContext(), Val, Elt, Idx))
1686 return FC; // Fold a few common cases...
1687 // Look up the constant in the table first to ensure uniqueness
1688 std::vector<Constant*> ArgVec(1, Val);
1689 ArgVec.push_back(Elt);
1690 ArgVec.push_back(Idx);
1691 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1693 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1695 // Implicitly locked.
1696 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1699 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1701 assert(isa<VectorType>(Val->getType()) &&
1702 "Tried to create insertelement operation on non-vector type!");
1703 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1704 && "Insertelement types must match!");
1705 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1706 "Insertelement index must be i32 type!");
1707 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1710 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1711 Constant *V2, Constant *Mask) {
1712 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1713 ReqTy->getContext(), V1, V2, Mask))
1714 return FC; // Fold a few common cases...
1715 // Look up the constant in the table first to ensure uniqueness
1716 std::vector<Constant*> ArgVec(1, V1);
1717 ArgVec.push_back(V2);
1718 ArgVec.push_back(Mask);
1719 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1721 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1723 // Implicitly locked.
1724 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1727 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1729 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1730 "Invalid shuffle vector constant expr operands!");
1732 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1733 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1734 const Type *ShufTy = VectorType::get(EltTy, NElts);
1735 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1738 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1740 const unsigned *Idxs, unsigned NumIdx) {
1741 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1742 Idxs+NumIdx) == Val->getType() &&
1743 "insertvalue indices invalid!");
1744 assert(Agg->getType() == ReqTy &&
1745 "insertvalue type invalid!");
1746 assert(Agg->getType()->isFirstClassType() &&
1747 "Non-first-class type for constant InsertValue expression");
1748 Constant *FC = ConstantFoldInsertValueInstruction(
1749 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1750 assert(FC && "InsertValue constant expr couldn't be folded!");
1754 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1755 const unsigned *IdxList, unsigned NumIdx) {
1756 assert(Agg->getType()->isFirstClassType() &&
1757 "Tried to create insertelement operation on non-first-class type!");
1759 const Type *ReqTy = Agg->getType();
1762 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1764 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1765 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1768 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1769 const unsigned *Idxs, unsigned NumIdx) {
1770 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1771 Idxs+NumIdx) == ReqTy &&
1772 "extractvalue indices invalid!");
1773 assert(Agg->getType()->isFirstClassType() &&
1774 "Non-first-class type for constant extractvalue expression");
1775 Constant *FC = ConstantFoldExtractValueInstruction(
1776 ReqTy->getContext(), Agg, Idxs, NumIdx);
1777 assert(FC && "ExtractValue constant expr couldn't be folded!");
1781 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1782 const unsigned *IdxList, unsigned NumIdx) {
1783 assert(Agg->getType()->isFirstClassType() &&
1784 "Tried to create extractelement operation on non-first-class type!");
1787 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1788 assert(ReqTy && "extractvalue indices invalid!");
1789 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1792 Constant* ConstantExpr::getNeg(Constant* C) {
1793 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1794 if (C->getType()->isFPOrFPVector())
1796 assert(C->getType()->isIntOrIntVector() &&
1797 "Cannot NEG a nonintegral value!");
1798 return get(Instruction::Sub,
1799 ConstantFP::getZeroValueForNegation(C->getType()),
1803 Constant* ConstantExpr::getFNeg(Constant* C) {
1804 assert(C->getType()->isFPOrFPVector() &&
1805 "Cannot FNEG a non-floating-point value!");
1806 return get(Instruction::FSub,
1807 ConstantFP::getZeroValueForNegation(C->getType()),
1811 Constant* ConstantExpr::getNot(Constant* C) {
1812 assert(C->getType()->isIntOrIntVector() &&
1813 "Cannot NOT a nonintegral value!");
1814 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1817 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1818 return get(Instruction::Add, C1, C2);
1821 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1822 return get(Instruction::FAdd, C1, C2);
1825 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1826 return get(Instruction::Sub, C1, C2);
1829 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1830 return get(Instruction::FSub, C1, C2);
1833 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1834 return get(Instruction::Mul, C1, C2);
1837 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1838 return get(Instruction::FMul, C1, C2);
1841 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1842 return get(Instruction::UDiv, C1, C2);
1845 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1846 return get(Instruction::SDiv, C1, C2);
1849 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1850 return get(Instruction::FDiv, C1, C2);
1853 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1854 return get(Instruction::URem, C1, C2);
1857 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1858 return get(Instruction::SRem, C1, C2);
1861 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1862 return get(Instruction::FRem, C1, C2);
1865 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1866 return get(Instruction::And, C1, C2);
1869 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1870 return get(Instruction::Or, C1, C2);
1873 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1874 return get(Instruction::Xor, C1, C2);
1877 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1878 return get(Instruction::Shl, C1, C2);
1881 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1882 return get(Instruction::LShr, C1, C2);
1885 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1886 return get(Instruction::AShr, C1, C2);
1889 // destroyConstant - Remove the constant from the constant table...
1891 void ConstantExpr::destroyConstant() {
1892 // Implicitly locked.
1893 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1894 pImpl->ExprConstants.remove(this);
1895 destroyConstantImpl();
1898 const char *ConstantExpr::getOpcodeName() const {
1899 return Instruction::getOpcodeName(getOpcode());
1902 //===----------------------------------------------------------------------===//
1903 // replaceUsesOfWithOnConstant implementations
1905 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1906 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1909 /// Note that we intentionally replace all uses of From with To here. Consider
1910 /// a large array that uses 'From' 1000 times. By handling this case all here,
1911 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1912 /// single invocation handles all 1000 uses. Handling them one at a time would
1913 /// work, but would be really slow because it would have to unique each updated
1916 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1918 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1919 Constant *ToC = cast<Constant>(To);
1921 LLVMContext &Context = getType()->getContext();
1922 LLVMContextImpl *pImpl = Context.pImpl;
1924 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1925 Lookup.first.first = getType();
1926 Lookup.second = this;
1928 std::vector<Constant*> &Values = Lookup.first.second;
1929 Values.reserve(getNumOperands()); // Build replacement array.
1931 // Fill values with the modified operands of the constant array. Also,
1932 // compute whether this turns into an all-zeros array.
1933 bool isAllZeros = false;
1934 unsigned NumUpdated = 0;
1935 if (!ToC->isNullValue()) {
1936 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1937 Constant *Val = cast<Constant>(O->get());
1942 Values.push_back(Val);
1946 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1947 Constant *Val = cast<Constant>(O->get());
1952 Values.push_back(Val);
1953 if (isAllZeros) isAllZeros = Val->isNullValue();
1957 Constant *Replacement = 0;
1959 Replacement = ConstantAggregateZero::get(getType());
1961 // Check to see if we have this array type already.
1963 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1964 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1967 Replacement = I->second;
1969 // Okay, the new shape doesn't exist in the system yet. Instead of
1970 // creating a new constant array, inserting it, replaceallusesof'ing the
1971 // old with the new, then deleting the old... just update the current one
1973 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1975 // Update to the new value. Optimize for the case when we have a single
1976 // operand that we're changing, but handle bulk updates efficiently.
1977 if (NumUpdated == 1) {
1978 unsigned OperandToUpdate = U - OperandList;
1979 assert(getOperand(OperandToUpdate) == From &&
1980 "ReplaceAllUsesWith broken!");
1981 setOperand(OperandToUpdate, ToC);
1983 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1984 if (getOperand(i) == From)
1991 // Otherwise, I do need to replace this with an existing value.
1992 assert(Replacement != this && "I didn't contain From!");
1994 // Everyone using this now uses the replacement.
1995 uncheckedReplaceAllUsesWith(Replacement);
1997 // Delete the old constant!
2001 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2003 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2004 Constant *ToC = cast<Constant>(To);
2006 unsigned OperandToUpdate = U-OperandList;
2007 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2009 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2010 Lookup.first.first = getType();
2011 Lookup.second = this;
2012 std::vector<Constant*> &Values = Lookup.first.second;
2013 Values.reserve(getNumOperands()); // Build replacement struct.
2016 // Fill values with the modified operands of the constant struct. Also,
2017 // compute whether this turns into an all-zeros struct.
2018 bool isAllZeros = false;
2019 if (!ToC->isNullValue()) {
2020 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2021 Values.push_back(cast<Constant>(O->get()));
2024 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2025 Constant *Val = cast<Constant>(O->get());
2026 Values.push_back(Val);
2027 if (isAllZeros) isAllZeros = Val->isNullValue();
2030 Values[OperandToUpdate] = ToC;
2032 LLVMContext &Context = getType()->getContext();
2033 LLVMContextImpl *pImpl = Context.pImpl;
2035 Constant *Replacement = 0;
2037 Replacement = ConstantAggregateZero::get(getType());
2039 // Check to see if we have this array type already.
2041 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2042 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2045 Replacement = I->second;
2047 // Okay, the new shape doesn't exist in the system yet. Instead of
2048 // creating a new constant struct, inserting it, replaceallusesof'ing the
2049 // old with the new, then deleting the old... just update the current one
2051 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2053 // Update to the new value.
2054 setOperand(OperandToUpdate, ToC);
2059 assert(Replacement != this && "I didn't contain From!");
2061 // Everyone using this now uses the replacement.
2062 uncheckedReplaceAllUsesWith(Replacement);
2064 // Delete the old constant!
2068 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2070 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2072 std::vector<Constant*> Values;
2073 Values.reserve(getNumOperands()); // Build replacement array...
2074 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2075 Constant *Val = getOperand(i);
2076 if (Val == From) Val = cast<Constant>(To);
2077 Values.push_back(Val);
2080 Constant *Replacement = get(getType(), Values);
2081 assert(Replacement != this && "I didn't contain From!");
2083 // Everyone using this now uses the replacement.
2084 uncheckedReplaceAllUsesWith(Replacement);
2086 // Delete the old constant!
2090 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2092 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2093 Constant *To = cast<Constant>(ToV);
2095 Constant *Replacement = 0;
2096 if (getOpcode() == Instruction::GetElementPtr) {
2097 SmallVector<Constant*, 8> Indices;
2098 Constant *Pointer = getOperand(0);
2099 Indices.reserve(getNumOperands()-1);
2100 if (Pointer == From) Pointer = To;
2102 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2103 Constant *Val = getOperand(i);
2104 if (Val == From) Val = To;
2105 Indices.push_back(Val);
2107 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2108 &Indices[0], Indices.size());
2109 } else if (getOpcode() == Instruction::ExtractValue) {
2110 Constant *Agg = getOperand(0);
2111 if (Agg == From) Agg = To;
2113 const SmallVector<unsigned, 4> &Indices = getIndices();
2114 Replacement = ConstantExpr::getExtractValue(Agg,
2115 &Indices[0], Indices.size());
2116 } else if (getOpcode() == Instruction::InsertValue) {
2117 Constant *Agg = getOperand(0);
2118 Constant *Val = getOperand(1);
2119 if (Agg == From) Agg = To;
2120 if (Val == From) Val = To;
2122 const SmallVector<unsigned, 4> &Indices = getIndices();
2123 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2124 &Indices[0], Indices.size());
2125 } else if (isCast()) {
2126 assert(getOperand(0) == From && "Cast only has one use!");
2127 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2128 } else if (getOpcode() == Instruction::Select) {
2129 Constant *C1 = getOperand(0);
2130 Constant *C2 = getOperand(1);
2131 Constant *C3 = getOperand(2);
2132 if (C1 == From) C1 = To;
2133 if (C2 == From) C2 = To;
2134 if (C3 == From) C3 = To;
2135 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2136 } else if (getOpcode() == Instruction::ExtractElement) {
2137 Constant *C1 = getOperand(0);
2138 Constant *C2 = getOperand(1);
2139 if (C1 == From) C1 = To;
2140 if (C2 == From) C2 = To;
2141 Replacement = ConstantExpr::getExtractElement(C1, C2);
2142 } else if (getOpcode() == Instruction::InsertElement) {
2143 Constant *C1 = getOperand(0);
2144 Constant *C2 = getOperand(1);
2145 Constant *C3 = getOperand(1);
2146 if (C1 == From) C1 = To;
2147 if (C2 == From) C2 = To;
2148 if (C3 == From) C3 = To;
2149 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2150 } else if (getOpcode() == Instruction::ShuffleVector) {
2151 Constant *C1 = getOperand(0);
2152 Constant *C2 = getOperand(1);
2153 Constant *C3 = getOperand(2);
2154 if (C1 == From) C1 = To;
2155 if (C2 == From) C2 = To;
2156 if (C3 == From) C3 = To;
2157 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2158 } else if (isCompare()) {
2159 Constant *C1 = getOperand(0);
2160 Constant *C2 = getOperand(1);
2161 if (C1 == From) C1 = To;
2162 if (C2 == From) C2 = To;
2163 if (getOpcode() == Instruction::ICmp)
2164 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2166 assert(getOpcode() == Instruction::FCmp);
2167 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2169 } else if (getNumOperands() == 2) {
2170 Constant *C1 = getOperand(0);
2171 Constant *C2 = getOperand(1);
2172 if (C1 == From) C1 = To;
2173 if (C2 == From) C2 = To;
2174 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassData);
2176 llvm_unreachable("Unknown ConstantExpr type!");
2180 assert(Replacement != this && "I didn't contain From!");
2182 // Everyone using this now uses the replacement.
2183 uncheckedReplaceAllUsesWith(Replacement);
2185 // Delete the old constant!