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 // Remove the old entry, this can't cause the map to rehash (just a
1078 // tombstone will get added).
1079 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1087 // Otherwise, I do need to replace this with an existing value.
1088 assert(NewBA != this && "I didn't contain From!");
1090 // Everyone using this now uses the replacement.
1091 uncheckedReplaceAllUsesWith(NewBA);
1096 //---- ConstantExpr::get() implementations.
1099 /// This is a utility function to handle folding of casts and lookup of the
1100 /// cast in the ExprConstants map. It is used by the various get* methods below.
1101 static inline Constant *getFoldedCast(
1102 Instruction::CastOps opc, Constant *C, const Type *Ty) {
1103 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1104 // Fold a few common cases
1105 if (Constant *FC = ConstantFoldCastInstruction(Ty->getContext(), opc, C, Ty))
1108 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1110 // Look up the constant in the table first to ensure uniqueness
1111 std::vector<Constant*> argVec(1, C);
1112 ExprMapKeyType Key(opc, argVec);
1114 // Implicitly locked.
1115 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1118 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, const Type *Ty) {
1119 Instruction::CastOps opc = Instruction::CastOps(oc);
1120 assert(Instruction::isCast(opc) && "opcode out of range");
1121 assert(C && Ty && "Null arguments to getCast");
1122 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1126 llvm_unreachable("Invalid cast opcode");
1128 case Instruction::Trunc: return getTrunc(C, Ty);
1129 case Instruction::ZExt: return getZExt(C, Ty);
1130 case Instruction::SExt: return getSExt(C, Ty);
1131 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1132 case Instruction::FPExt: return getFPExtend(C, Ty);
1133 case Instruction::UIToFP: return getUIToFP(C, Ty);
1134 case Instruction::SIToFP: return getSIToFP(C, Ty);
1135 case Instruction::FPToUI: return getFPToUI(C, Ty);
1136 case Instruction::FPToSI: return getFPToSI(C, Ty);
1137 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1138 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1139 case Instruction::BitCast: return getBitCast(C, Ty);
1144 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, const Type *Ty) {
1145 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1146 return getCast(Instruction::BitCast, C, Ty);
1147 return getCast(Instruction::ZExt, C, Ty);
1150 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, const Type *Ty) {
1151 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1152 return getCast(Instruction::BitCast, C, Ty);
1153 return getCast(Instruction::SExt, C, Ty);
1156 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, const Type *Ty) {
1157 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1158 return getCast(Instruction::BitCast, C, Ty);
1159 return getCast(Instruction::Trunc, C, Ty);
1162 Constant *ConstantExpr::getPointerCast(Constant *S, const Type *Ty) {
1163 assert(isa<PointerType>(S->getType()) && "Invalid cast");
1164 assert((Ty->isInteger() || isa<PointerType>(Ty)) && "Invalid cast");
1166 if (Ty->isInteger())
1167 return getCast(Instruction::PtrToInt, S, Ty);
1168 return getCast(Instruction::BitCast, S, Ty);
1171 Constant *ConstantExpr::getIntegerCast(Constant *C, const Type *Ty,
1173 assert(C->getType()->isIntOrIntVector() &&
1174 Ty->isIntOrIntVector() && "Invalid cast");
1175 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1176 unsigned DstBits = Ty->getScalarSizeInBits();
1177 Instruction::CastOps opcode =
1178 (SrcBits == DstBits ? Instruction::BitCast :
1179 (SrcBits > DstBits ? Instruction::Trunc :
1180 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1181 return getCast(opcode, C, Ty);
1184 Constant *ConstantExpr::getFPCast(Constant *C, const Type *Ty) {
1185 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1187 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1188 unsigned DstBits = Ty->getScalarSizeInBits();
1189 if (SrcBits == DstBits)
1190 return C; // Avoid a useless cast
1191 Instruction::CastOps opcode =
1192 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1193 return getCast(opcode, C, Ty);
1196 Constant *ConstantExpr::getTrunc(Constant *C, const Type *Ty) {
1198 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1199 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1201 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1202 assert(C->getType()->isIntOrIntVector() && "Trunc operand must be integer");
1203 assert(Ty->isIntOrIntVector() && "Trunc produces only integral");
1204 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1205 "SrcTy must be larger than DestTy for Trunc!");
1207 return getFoldedCast(Instruction::Trunc, C, Ty);
1210 Constant *ConstantExpr::getSExt(Constant *C, const Type *Ty) {
1212 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1213 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1215 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1216 assert(C->getType()->isIntOrIntVector() && "SExt operand must be integral");
1217 assert(Ty->isIntOrIntVector() && "SExt produces only integer");
1218 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1219 "SrcTy must be smaller than DestTy for SExt!");
1221 return getFoldedCast(Instruction::SExt, C, Ty);
1224 Constant *ConstantExpr::getZExt(Constant *C, const Type *Ty) {
1226 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1227 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1229 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1230 assert(C->getType()->isIntOrIntVector() && "ZEXt operand must be integral");
1231 assert(Ty->isIntOrIntVector() && "ZExt produces only integer");
1232 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1233 "SrcTy must be smaller than DestTy for ZExt!");
1235 return getFoldedCast(Instruction::ZExt, C, Ty);
1238 Constant *ConstantExpr::getFPTrunc(Constant *C, const Type *Ty) {
1240 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1241 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1243 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1244 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1245 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1246 "This is an illegal floating point truncation!");
1247 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1250 Constant *ConstantExpr::getFPExtend(Constant *C, const Type *Ty) {
1252 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1253 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1255 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1256 assert(C->getType()->isFPOrFPVector() && Ty->isFPOrFPVector() &&
1257 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1258 "This is an illegal floating point extension!");
1259 return getFoldedCast(Instruction::FPExt, C, Ty);
1262 Constant *ConstantExpr::getUIToFP(Constant *C, const Type *Ty) {
1264 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1265 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1267 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1268 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1269 "This is an illegal uint to floating point cast!");
1270 return getFoldedCast(Instruction::UIToFP, C, Ty);
1273 Constant *ConstantExpr::getSIToFP(Constant *C, const Type *Ty) {
1275 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1276 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1278 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1279 assert(C->getType()->isIntOrIntVector() && Ty->isFPOrFPVector() &&
1280 "This is an illegal sint to floating point cast!");
1281 return getFoldedCast(Instruction::SIToFP, C, Ty);
1284 Constant *ConstantExpr::getFPToUI(Constant *C, const Type *Ty) {
1286 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1287 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1289 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1290 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1291 "This is an illegal floating point to uint cast!");
1292 return getFoldedCast(Instruction::FPToUI, C, Ty);
1295 Constant *ConstantExpr::getFPToSI(Constant *C, const Type *Ty) {
1297 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1298 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1300 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1301 assert(C->getType()->isFPOrFPVector() && Ty->isIntOrIntVector() &&
1302 "This is an illegal floating point to sint cast!");
1303 return getFoldedCast(Instruction::FPToSI, C, Ty);
1306 Constant *ConstantExpr::getPtrToInt(Constant *C, const Type *DstTy) {
1307 assert(isa<PointerType>(C->getType()) && "PtrToInt source must be pointer");
1308 assert(DstTy->isInteger() && "PtrToInt destination must be integral");
1309 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1312 Constant *ConstantExpr::getIntToPtr(Constant *C, const Type *DstTy) {
1313 assert(C->getType()->isInteger() && "IntToPtr source must be integral");
1314 assert(isa<PointerType>(DstTy) && "IntToPtr destination must be a pointer");
1315 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1318 Constant *ConstantExpr::getBitCast(Constant *C, const Type *DstTy) {
1319 // BitCast implies a no-op cast of type only. No bits change. However, you
1320 // can't cast pointers to anything but pointers.
1322 const Type *SrcTy = C->getType();
1323 assert((isa<PointerType>(SrcTy) == isa<PointerType>(DstTy)) &&
1324 "BitCast cannot cast pointer to non-pointer and vice versa");
1326 // Now we know we're not dealing with mismatched pointer casts (ptr->nonptr
1327 // or nonptr->ptr). For all the other types, the cast is okay if source and
1328 // destination bit widths are identical.
1329 unsigned SrcBitSize = SrcTy->getPrimitiveSizeInBits();
1330 unsigned DstBitSize = DstTy->getPrimitiveSizeInBits();
1332 assert(SrcBitSize == DstBitSize && "BitCast requires types of same width");
1334 // It is common to ask for a bitcast of a value to its own type, handle this
1336 if (C->getType() == DstTy) return C;
1338 return getFoldedCast(Instruction::BitCast, C, DstTy);
1341 Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
1342 Constant *C1, Constant *C2,
1344 // Check the operands for consistency first
1345 assert(Opcode >= Instruction::BinaryOpsBegin &&
1346 Opcode < Instruction::BinaryOpsEnd &&
1347 "Invalid opcode in binary constant expression");
1348 assert(C1->getType() == C2->getType() &&
1349 "Operand types in binary constant expression should match");
1351 if (ReqTy == C1->getType() || ReqTy == Type::getInt1Ty(ReqTy->getContext()))
1352 if (Constant *FC = ConstantFoldBinaryInstruction(ReqTy->getContext(),
1354 return FC; // Fold a few common cases...
1356 std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
1357 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1359 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1361 // Implicitly locked.
1362 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1365 Constant *ConstantExpr::getCompareTy(unsigned short predicate,
1366 Constant *C1, Constant *C2) {
1367 switch (predicate) {
1368 default: llvm_unreachable("Invalid CmpInst predicate");
1369 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1370 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1371 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1372 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1373 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1374 case CmpInst::FCMP_TRUE:
1375 return getFCmp(predicate, C1, C2);
1377 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1378 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1379 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1380 case CmpInst::ICMP_SLE:
1381 return getICmp(predicate, C1, C2);
1385 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1387 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1388 if (C1->getType()->isFPOrFPVector()) {
1389 if (Opcode == Instruction::Add) Opcode = Instruction::FAdd;
1390 else if (Opcode == Instruction::Sub) Opcode = Instruction::FSub;
1391 else if (Opcode == Instruction::Mul) Opcode = Instruction::FMul;
1395 case Instruction::Add:
1396 case Instruction::Sub:
1397 case Instruction::Mul:
1398 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1399 assert(C1->getType()->isIntOrIntVector() &&
1400 "Tried to create an integer operation on a non-integer type!");
1402 case Instruction::FAdd:
1403 case Instruction::FSub:
1404 case Instruction::FMul:
1405 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1406 assert(C1->getType()->isFPOrFPVector() &&
1407 "Tried to create a floating-point operation on a "
1408 "non-floating-point type!");
1410 case Instruction::UDiv:
1411 case Instruction::SDiv:
1412 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1413 assert(C1->getType()->isIntOrIntVector() &&
1414 "Tried to create an arithmetic operation on a non-arithmetic type!");
1416 case Instruction::FDiv:
1417 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1418 assert(C1->getType()->isFPOrFPVector() &&
1419 "Tried to create an arithmetic operation on a non-arithmetic type!");
1421 case Instruction::URem:
1422 case Instruction::SRem:
1423 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1424 assert(C1->getType()->isIntOrIntVector() &&
1425 "Tried to create an arithmetic operation on a non-arithmetic type!");
1427 case Instruction::FRem:
1428 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1429 assert(C1->getType()->isFPOrFPVector() &&
1430 "Tried to create an arithmetic operation on a non-arithmetic type!");
1432 case Instruction::And:
1433 case Instruction::Or:
1434 case Instruction::Xor:
1435 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1436 assert(C1->getType()->isIntOrIntVector() &&
1437 "Tried to create a logical operation on a non-integral type!");
1439 case Instruction::Shl:
1440 case Instruction::LShr:
1441 case Instruction::AShr:
1442 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1443 assert(C1->getType()->isIntOrIntVector() &&
1444 "Tried to create a shift operation on a non-integer type!");
1451 return getTy(C1->getType(), Opcode, C1, C2, Flags);
1454 Constant* ConstantExpr::getSizeOf(const Type* Ty) {
1455 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1456 // Note that a non-inbounds gep is used, as null isn't within any object.
1457 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1458 Constant *GEP = getGetElementPtr(
1459 Constant::getNullValue(PointerType::getUnqual(Ty)), &GEPIdx, 1);
1460 return getCast(Instruction::PtrToInt, GEP,
1461 Type::getInt64Ty(Ty->getContext()));
1464 Constant* ConstantExpr::getAlignOf(const Type* Ty) {
1465 // alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
1466 // Note that a non-inbounds gep is used, as null isn't within any object.
1467 const Type *AligningTy = StructType::get(Ty->getContext(),
1468 Type::getInt8Ty(Ty->getContext()), Ty, NULL);
1469 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1470 Constant *Zero = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 0);
1471 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1472 Constant *Indices[2] = { Zero, One };
1473 Constant *GEP = getGetElementPtr(NullPtr, Indices, 2);
1474 return getCast(Instruction::PtrToInt, GEP,
1475 Type::getInt32Ty(Ty->getContext()));
1478 Constant* ConstantExpr::getOffsetOf(const StructType* STy, unsigned FieldNo) {
1479 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1480 // Note that a non-inbounds gep is used, as null isn't within any object.
1481 Constant *GEPIdx[] = {
1482 ConstantInt::get(Type::getInt64Ty(STy->getContext()), 0),
1483 ConstantInt::get(Type::getInt32Ty(STy->getContext()), FieldNo)
1485 Constant *GEP = getGetElementPtr(
1486 Constant::getNullValue(PointerType::getUnqual(STy)), GEPIdx, 2);
1487 return getCast(Instruction::PtrToInt, GEP,
1488 Type::getInt64Ty(STy->getContext()));
1491 Constant *ConstantExpr::getCompare(unsigned short pred,
1492 Constant *C1, Constant *C2) {
1493 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1494 return getCompareTy(pred, C1, C2);
1497 Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
1498 Constant *V1, Constant *V2) {
1499 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1501 if (ReqTy == V1->getType())
1502 if (Constant *SC = ConstantFoldSelectInstruction(
1503 ReqTy->getContext(), C, V1, V2))
1504 return SC; // Fold common cases
1506 std::vector<Constant*> argVec(3, C);
1509 ExprMapKeyType Key(Instruction::Select, argVec);
1511 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1513 // Implicitly locked.
1514 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1517 Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
1520 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1522 cast<PointerType>(ReqTy)->getElementType() &&
1523 "GEP indices invalid!");
1525 if (Constant *FC = ConstantFoldGetElementPtr(
1526 ReqTy->getContext(), C, /*inBounds=*/false,
1527 (Constant**)Idxs, NumIdx))
1528 return FC; // Fold a few common cases...
1530 assert(isa<PointerType>(C->getType()) &&
1531 "Non-pointer type for constant GetElementPtr expression");
1532 // Look up the constant in the table first to ensure uniqueness
1533 std::vector<Constant*> ArgVec;
1534 ArgVec.reserve(NumIdx+1);
1535 ArgVec.push_back(C);
1536 for (unsigned i = 0; i != NumIdx; ++i)
1537 ArgVec.push_back(cast<Constant>(Idxs[i]));
1538 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec);
1540 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1542 // Implicitly locked.
1543 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1546 Constant *ConstantExpr::getInBoundsGetElementPtrTy(const Type *ReqTy,
1550 assert(GetElementPtrInst::getIndexedType(C->getType(), Idxs,
1552 cast<PointerType>(ReqTy)->getElementType() &&
1553 "GEP indices invalid!");
1555 if (Constant *FC = ConstantFoldGetElementPtr(
1556 ReqTy->getContext(), C, /*inBounds=*/true,
1557 (Constant**)Idxs, NumIdx))
1558 return FC; // Fold a few common cases...
1560 assert(isa<PointerType>(C->getType()) &&
1561 "Non-pointer type for constant GetElementPtr expression");
1562 // Look up the constant in the table first to ensure uniqueness
1563 std::vector<Constant*> ArgVec;
1564 ArgVec.reserve(NumIdx+1);
1565 ArgVec.push_back(C);
1566 for (unsigned i = 0; i != NumIdx; ++i)
1567 ArgVec.push_back(cast<Constant>(Idxs[i]));
1568 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1569 GEPOperator::IsInBounds);
1571 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1573 // Implicitly locked.
1574 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1577 Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
1579 // Get the result type of the getelementptr!
1581 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1582 assert(Ty && "GEP indices invalid!");
1583 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1584 return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1587 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1590 // Get the result type of the getelementptr!
1592 GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
1593 assert(Ty && "GEP indices invalid!");
1594 unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
1595 return getInBoundsGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
1598 Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
1600 return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1603 Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
1604 Constant* const *Idxs,
1606 return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
1610 ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1611 assert(LHS->getType() == RHS->getType());
1612 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1613 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1615 if (Constant *FC = ConstantFoldCompareInstruction(
1616 LHS->getContext(), pred, LHS, RHS))
1617 return FC; // Fold a few common cases...
1619 // Look up the constant in the table first to ensure uniqueness
1620 std::vector<Constant*> ArgVec;
1621 ArgVec.push_back(LHS);
1622 ArgVec.push_back(RHS);
1623 // Get the key type with both the opcode and predicate
1624 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1626 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1628 // Implicitly locked.
1630 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1634 ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
1635 assert(LHS->getType() == RHS->getType());
1636 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1638 if (Constant *FC = ConstantFoldCompareInstruction(
1639 LHS->getContext(), pred, LHS, RHS))
1640 return FC; // Fold a few common cases...
1642 // Look up the constant in the table first to ensure uniqueness
1643 std::vector<Constant*> ArgVec;
1644 ArgVec.push_back(LHS);
1645 ArgVec.push_back(RHS);
1646 // Get the key type with both the opcode and predicate
1647 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1649 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1651 // Implicitly locked.
1653 pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
1656 Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
1658 if (Constant *FC = ConstantFoldExtractElementInstruction(
1659 ReqTy->getContext(), Val, Idx))
1660 return FC; // Fold a few common cases...
1661 // Look up the constant in the table first to ensure uniqueness
1662 std::vector<Constant*> ArgVec(1, Val);
1663 ArgVec.push_back(Idx);
1664 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1666 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1668 // Implicitly locked.
1669 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1672 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1673 assert(isa<VectorType>(Val->getType()) &&
1674 "Tried to create extractelement operation on non-vector type!");
1675 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1676 "Extractelement index must be i32 type!");
1677 return getExtractElementTy(cast<VectorType>(Val->getType())->getElementType(),
1681 Constant *ConstantExpr::getInsertElementTy(const Type *ReqTy, Constant *Val,
1682 Constant *Elt, Constant *Idx) {
1683 if (Constant *FC = ConstantFoldInsertElementInstruction(
1684 ReqTy->getContext(), Val, Elt, Idx))
1685 return FC; // Fold a few common cases...
1686 // Look up the constant in the table first to ensure uniqueness
1687 std::vector<Constant*> ArgVec(1, Val);
1688 ArgVec.push_back(Elt);
1689 ArgVec.push_back(Idx);
1690 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1692 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1694 // Implicitly locked.
1695 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1698 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1700 assert(isa<VectorType>(Val->getType()) &&
1701 "Tried to create insertelement operation on non-vector type!");
1702 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1703 && "Insertelement types must match!");
1704 assert(Idx->getType() == Type::getInt32Ty(Val->getContext()) &&
1705 "Insertelement index must be i32 type!");
1706 return getInsertElementTy(Val->getType(), Val, Elt, Idx);
1709 Constant *ConstantExpr::getShuffleVectorTy(const Type *ReqTy, Constant *V1,
1710 Constant *V2, Constant *Mask) {
1711 if (Constant *FC = ConstantFoldShuffleVectorInstruction(
1712 ReqTy->getContext(), V1, V2, Mask))
1713 return FC; // Fold a few common cases...
1714 // Look up the constant in the table first to ensure uniqueness
1715 std::vector<Constant*> ArgVec(1, V1);
1716 ArgVec.push_back(V2);
1717 ArgVec.push_back(Mask);
1718 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1720 LLVMContextImpl *pImpl = ReqTy->getContext().pImpl;
1722 // Implicitly locked.
1723 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1726 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1728 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1729 "Invalid shuffle vector constant expr operands!");
1731 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1732 const Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1733 const Type *ShufTy = VectorType::get(EltTy, NElts);
1734 return getShuffleVectorTy(ShufTy, V1, V2, Mask);
1737 Constant *ConstantExpr::getInsertValueTy(const Type *ReqTy, Constant *Agg,
1739 const unsigned *Idxs, unsigned NumIdx) {
1740 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1741 Idxs+NumIdx) == Val->getType() &&
1742 "insertvalue indices invalid!");
1743 assert(Agg->getType() == ReqTy &&
1744 "insertvalue type invalid!");
1745 assert(Agg->getType()->isFirstClassType() &&
1746 "Non-first-class type for constant InsertValue expression");
1747 Constant *FC = ConstantFoldInsertValueInstruction(
1748 ReqTy->getContext(), Agg, Val, Idxs, NumIdx);
1749 assert(FC && "InsertValue constant expr couldn't be folded!");
1753 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1754 const unsigned *IdxList, unsigned NumIdx) {
1755 assert(Agg->getType()->isFirstClassType() &&
1756 "Tried to create insertelement operation on non-first-class type!");
1758 const Type *ReqTy = Agg->getType();
1761 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1763 assert(ValTy == Val->getType() && "insertvalue indices invalid!");
1764 return getInsertValueTy(ReqTy, Agg, Val, IdxList, NumIdx);
1767 Constant *ConstantExpr::getExtractValueTy(const Type *ReqTy, Constant *Agg,
1768 const unsigned *Idxs, unsigned NumIdx) {
1769 assert(ExtractValueInst::getIndexedType(Agg->getType(), Idxs,
1770 Idxs+NumIdx) == ReqTy &&
1771 "extractvalue indices invalid!");
1772 assert(Agg->getType()->isFirstClassType() &&
1773 "Non-first-class type for constant extractvalue expression");
1774 Constant *FC = ConstantFoldExtractValueInstruction(
1775 ReqTy->getContext(), Agg, Idxs, NumIdx);
1776 assert(FC && "ExtractValue constant expr couldn't be folded!");
1780 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1781 const unsigned *IdxList, unsigned NumIdx) {
1782 assert(Agg->getType()->isFirstClassType() &&
1783 "Tried to create extractelement operation on non-first-class type!");
1786 ExtractValueInst::getIndexedType(Agg->getType(), IdxList, IdxList+NumIdx);
1787 assert(ReqTy && "extractvalue indices invalid!");
1788 return getExtractValueTy(ReqTy, Agg, IdxList, NumIdx);
1791 Constant* ConstantExpr::getNeg(Constant* C) {
1792 // API compatibility: Adjust integer opcodes to floating-point opcodes.
1793 if (C->getType()->isFPOrFPVector())
1795 assert(C->getType()->isIntOrIntVector() &&
1796 "Cannot NEG a nonintegral value!");
1797 return get(Instruction::Sub,
1798 ConstantFP::getZeroValueForNegation(C->getType()),
1802 Constant* ConstantExpr::getFNeg(Constant* C) {
1803 assert(C->getType()->isFPOrFPVector() &&
1804 "Cannot FNEG a non-floating-point value!");
1805 return get(Instruction::FSub,
1806 ConstantFP::getZeroValueForNegation(C->getType()),
1810 Constant* ConstantExpr::getNot(Constant* C) {
1811 assert(C->getType()->isIntOrIntVector() &&
1812 "Cannot NOT a nonintegral value!");
1813 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1816 Constant* ConstantExpr::getAdd(Constant* C1, Constant* C2) {
1817 return get(Instruction::Add, C1, C2);
1820 Constant* ConstantExpr::getFAdd(Constant* C1, Constant* C2) {
1821 return get(Instruction::FAdd, C1, C2);
1824 Constant* ConstantExpr::getSub(Constant* C1, Constant* C2) {
1825 return get(Instruction::Sub, C1, C2);
1828 Constant* ConstantExpr::getFSub(Constant* C1, Constant* C2) {
1829 return get(Instruction::FSub, C1, C2);
1832 Constant* ConstantExpr::getMul(Constant* C1, Constant* C2) {
1833 return get(Instruction::Mul, C1, C2);
1836 Constant* ConstantExpr::getFMul(Constant* C1, Constant* C2) {
1837 return get(Instruction::FMul, C1, C2);
1840 Constant* ConstantExpr::getUDiv(Constant* C1, Constant* C2) {
1841 return get(Instruction::UDiv, C1, C2);
1844 Constant* ConstantExpr::getSDiv(Constant* C1, Constant* C2) {
1845 return get(Instruction::SDiv, C1, C2);
1848 Constant* ConstantExpr::getFDiv(Constant* C1, Constant* C2) {
1849 return get(Instruction::FDiv, C1, C2);
1852 Constant* ConstantExpr::getURem(Constant* C1, Constant* C2) {
1853 return get(Instruction::URem, C1, C2);
1856 Constant* ConstantExpr::getSRem(Constant* C1, Constant* C2) {
1857 return get(Instruction::SRem, C1, C2);
1860 Constant* ConstantExpr::getFRem(Constant* C1, Constant* C2) {
1861 return get(Instruction::FRem, C1, C2);
1864 Constant* ConstantExpr::getAnd(Constant* C1, Constant* C2) {
1865 return get(Instruction::And, C1, C2);
1868 Constant* ConstantExpr::getOr(Constant* C1, Constant* C2) {
1869 return get(Instruction::Or, C1, C2);
1872 Constant* ConstantExpr::getXor(Constant* C1, Constant* C2) {
1873 return get(Instruction::Xor, C1, C2);
1876 Constant* ConstantExpr::getShl(Constant* C1, Constant* C2) {
1877 return get(Instruction::Shl, C1, C2);
1880 Constant* ConstantExpr::getLShr(Constant* C1, Constant* C2) {
1881 return get(Instruction::LShr, C1, C2);
1884 Constant* ConstantExpr::getAShr(Constant* C1, Constant* C2) {
1885 return get(Instruction::AShr, C1, C2);
1888 // destroyConstant - Remove the constant from the constant table...
1890 void ConstantExpr::destroyConstant() {
1891 // Implicitly locked.
1892 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1893 pImpl->ExprConstants.remove(this);
1894 destroyConstantImpl();
1897 const char *ConstantExpr::getOpcodeName() const {
1898 return Instruction::getOpcodeName(getOpcode());
1901 //===----------------------------------------------------------------------===//
1902 // replaceUsesOfWithOnConstant implementations
1904 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1905 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1908 /// Note that we intentionally replace all uses of From with To here. Consider
1909 /// a large array that uses 'From' 1000 times. By handling this case all here,
1910 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1911 /// single invocation handles all 1000 uses. Handling them one at a time would
1912 /// work, but would be really slow because it would have to unique each updated
1915 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1917 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1918 Constant *ToC = cast<Constant>(To);
1920 LLVMContext &Context = getType()->getContext();
1921 LLVMContextImpl *pImpl = Context.pImpl;
1923 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1924 Lookup.first.first = getType();
1925 Lookup.second = this;
1927 std::vector<Constant*> &Values = Lookup.first.second;
1928 Values.reserve(getNumOperands()); // Build replacement array.
1930 // Fill values with the modified operands of the constant array. Also,
1931 // compute whether this turns into an all-zeros array.
1932 bool isAllZeros = false;
1933 unsigned NumUpdated = 0;
1934 if (!ToC->isNullValue()) {
1935 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1936 Constant *Val = cast<Constant>(O->get());
1941 Values.push_back(Val);
1945 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1946 Constant *Val = cast<Constant>(O->get());
1951 Values.push_back(Val);
1952 if (isAllZeros) isAllZeros = Val->isNullValue();
1956 Constant *Replacement = 0;
1958 Replacement = ConstantAggregateZero::get(getType());
1960 // Check to see if we have this array type already.
1962 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1963 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1966 Replacement = I->second;
1968 // Okay, the new shape doesn't exist in the system yet. Instead of
1969 // creating a new constant array, inserting it, replaceallusesof'ing the
1970 // old with the new, then deleting the old... just update the current one
1972 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1974 // Update to the new value. Optimize for the case when we have a single
1975 // operand that we're changing, but handle bulk updates efficiently.
1976 if (NumUpdated == 1) {
1977 unsigned OperandToUpdate = U - OperandList;
1978 assert(getOperand(OperandToUpdate) == From &&
1979 "ReplaceAllUsesWith broken!");
1980 setOperand(OperandToUpdate, ToC);
1982 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1983 if (getOperand(i) == From)
1990 // Otherwise, I do need to replace this with an existing value.
1991 assert(Replacement != this && "I didn't contain From!");
1993 // Everyone using this now uses the replacement.
1994 uncheckedReplaceAllUsesWith(Replacement);
1996 // Delete the old constant!
2000 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2002 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2003 Constant *ToC = cast<Constant>(To);
2005 unsigned OperandToUpdate = U-OperandList;
2006 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2008 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2009 Lookup.first.first = getType();
2010 Lookup.second = this;
2011 std::vector<Constant*> &Values = Lookup.first.second;
2012 Values.reserve(getNumOperands()); // Build replacement struct.
2015 // Fill values with the modified operands of the constant struct. Also,
2016 // compute whether this turns into an all-zeros struct.
2017 bool isAllZeros = false;
2018 if (!ToC->isNullValue()) {
2019 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2020 Values.push_back(cast<Constant>(O->get()));
2023 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2024 Constant *Val = cast<Constant>(O->get());
2025 Values.push_back(Val);
2026 if (isAllZeros) isAllZeros = Val->isNullValue();
2029 Values[OperandToUpdate] = ToC;
2031 LLVMContext &Context = getType()->getContext();
2032 LLVMContextImpl *pImpl = Context.pImpl;
2034 Constant *Replacement = 0;
2036 Replacement = ConstantAggregateZero::get(getType());
2038 // Check to see if we have this array type already.
2040 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2041 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2044 Replacement = I->second;
2046 // Okay, the new shape doesn't exist in the system yet. Instead of
2047 // creating a new constant struct, inserting it, replaceallusesof'ing the
2048 // old with the new, then deleting the old... just update the current one
2050 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2052 // Update to the new value.
2053 setOperand(OperandToUpdate, ToC);
2058 assert(Replacement != this && "I didn't contain From!");
2060 // Everyone using this now uses the replacement.
2061 uncheckedReplaceAllUsesWith(Replacement);
2063 // Delete the old constant!
2067 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2069 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2071 std::vector<Constant*> Values;
2072 Values.reserve(getNumOperands()); // Build replacement array...
2073 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2074 Constant *Val = getOperand(i);
2075 if (Val == From) Val = cast<Constant>(To);
2076 Values.push_back(Val);
2079 Constant *Replacement = get(getType(), Values);
2080 assert(Replacement != this && "I didn't contain From!");
2082 // Everyone using this now uses the replacement.
2083 uncheckedReplaceAllUsesWith(Replacement);
2085 // Delete the old constant!
2089 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2091 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2092 Constant *To = cast<Constant>(ToV);
2094 Constant *Replacement = 0;
2095 if (getOpcode() == Instruction::GetElementPtr) {
2096 SmallVector<Constant*, 8> Indices;
2097 Constant *Pointer = getOperand(0);
2098 Indices.reserve(getNumOperands()-1);
2099 if (Pointer == From) Pointer = To;
2101 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2102 Constant *Val = getOperand(i);
2103 if (Val == From) Val = To;
2104 Indices.push_back(Val);
2106 Replacement = ConstantExpr::getGetElementPtr(Pointer,
2107 &Indices[0], Indices.size());
2108 } else if (getOpcode() == Instruction::ExtractValue) {
2109 Constant *Agg = getOperand(0);
2110 if (Agg == From) Agg = To;
2112 const SmallVector<unsigned, 4> &Indices = getIndices();
2113 Replacement = ConstantExpr::getExtractValue(Agg,
2114 &Indices[0], Indices.size());
2115 } else if (getOpcode() == Instruction::InsertValue) {
2116 Constant *Agg = getOperand(0);
2117 Constant *Val = getOperand(1);
2118 if (Agg == From) Agg = To;
2119 if (Val == From) Val = To;
2121 const SmallVector<unsigned, 4> &Indices = getIndices();
2122 Replacement = ConstantExpr::getInsertValue(Agg, Val,
2123 &Indices[0], Indices.size());
2124 } else if (isCast()) {
2125 assert(getOperand(0) == From && "Cast only has one use!");
2126 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2127 } else if (getOpcode() == Instruction::Select) {
2128 Constant *C1 = getOperand(0);
2129 Constant *C2 = getOperand(1);
2130 Constant *C3 = getOperand(2);
2131 if (C1 == From) C1 = To;
2132 if (C2 == From) C2 = To;
2133 if (C3 == From) C3 = To;
2134 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2135 } else if (getOpcode() == Instruction::ExtractElement) {
2136 Constant *C1 = getOperand(0);
2137 Constant *C2 = getOperand(1);
2138 if (C1 == From) C1 = To;
2139 if (C2 == From) C2 = To;
2140 Replacement = ConstantExpr::getExtractElement(C1, C2);
2141 } else if (getOpcode() == Instruction::InsertElement) {
2142 Constant *C1 = getOperand(0);
2143 Constant *C2 = getOperand(1);
2144 Constant *C3 = getOperand(1);
2145 if (C1 == From) C1 = To;
2146 if (C2 == From) C2 = To;
2147 if (C3 == From) C3 = To;
2148 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2149 } else if (getOpcode() == Instruction::ShuffleVector) {
2150 Constant *C1 = getOperand(0);
2151 Constant *C2 = getOperand(1);
2152 Constant *C3 = getOperand(2);
2153 if (C1 == From) C1 = To;
2154 if (C2 == From) C2 = To;
2155 if (C3 == From) C3 = To;
2156 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2157 } else if (isCompare()) {
2158 Constant *C1 = getOperand(0);
2159 Constant *C2 = getOperand(1);
2160 if (C1 == From) C1 = To;
2161 if (C2 == From) C2 = To;
2162 if (getOpcode() == Instruction::ICmp)
2163 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2165 assert(getOpcode() == Instruction::FCmp);
2166 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2168 } else if (getNumOperands() == 2) {
2169 Constant *C1 = getOperand(0);
2170 Constant *C2 = getOperand(1);
2171 if (C1 == From) C1 = To;
2172 if (C2 == From) C2 = To;
2173 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassData);
2175 llvm_unreachable("Unknown ConstantExpr type!");
2179 assert(Replacement != this && "I didn't contain From!");
2181 // Everyone using this now uses the replacement.
2182 uncheckedReplaceAllUsesWith(Replacement);
2184 // Delete the old constant!