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/ADT/DenseMap.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/STLExtras.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Otherwise, just use +0.0.
54 bool Constant::isNullValue() const {
56 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
60 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
61 return CFP->isZero() && !CFP->isNegative();
63 // constant zero is zero for aggregates and cpnull is null for pointers.
64 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
67 bool Constant::isAllOnesValue() const {
68 // Check for -1 integers
69 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
70 return CI->isMinusOne();
72 // Check for FP which are bitcasted from -1 integers
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
74 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
76 // Check for constant vectors which are splats of -1 values.
77 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
78 if (Constant *Splat = CV->getSplatValue())
79 return Splat->isAllOnesValue();
84 // Constructor to create a '0' constant of arbitrary type...
85 Constant *Constant::getNullValue(Type *Ty) {
86 switch (Ty->getTypeID()) {
87 case Type::IntegerTyID:
88 return ConstantInt::get(Ty, 0);
90 return ConstantFP::get(Ty->getContext(),
91 APFloat::getZero(APFloat::IEEEhalf));
93 return ConstantFP::get(Ty->getContext(),
94 APFloat::getZero(APFloat::IEEEsingle));
95 case Type::DoubleTyID:
96 return ConstantFP::get(Ty->getContext(),
97 APFloat::getZero(APFloat::IEEEdouble));
98 case Type::X86_FP80TyID:
99 return ConstantFP::get(Ty->getContext(),
100 APFloat::getZero(APFloat::x87DoubleExtended));
101 case Type::FP128TyID:
102 return ConstantFP::get(Ty->getContext(),
103 APFloat::getZero(APFloat::IEEEquad));
104 case Type::PPC_FP128TyID:
105 return ConstantFP::get(Ty->getContext(),
106 APFloat(APInt::getNullValue(128)));
107 case Type::PointerTyID:
108 return ConstantPointerNull::get(cast<PointerType>(Ty));
109 case Type::StructTyID:
110 case Type::ArrayTyID:
111 case Type::VectorTyID:
112 return ConstantAggregateZero::get(Ty);
114 // Function, Label, or Opaque type?
115 assert(0 && "Cannot create a null constant of that type!");
120 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
121 Type *ScalarTy = Ty->getScalarType();
123 // Create the base integer constant.
124 Constant *C = ConstantInt::get(Ty->getContext(), V);
126 // Convert an integer to a pointer, if necessary.
127 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
128 C = ConstantExpr::getIntToPtr(C, PTy);
130 // Broadcast a scalar to a vector, if necessary.
131 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
132 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
137 Constant *Constant::getAllOnesValue(Type *Ty) {
138 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
139 return ConstantInt::get(Ty->getContext(),
140 APInt::getAllOnesValue(ITy->getBitWidth()));
142 if (Ty->isFloatingPointTy()) {
143 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
144 !Ty->isPPC_FP128Ty());
145 return ConstantFP::get(Ty->getContext(), FL);
148 SmallVector<Constant*, 16> Elts;
149 VectorType *VTy = cast<VectorType>(Ty);
150 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
151 assert(Elts[0] && "Invalid AllOnes value!");
152 return cast<ConstantVector>(ConstantVector::get(Elts));
155 void Constant::destroyConstantImpl() {
156 // When a Constant is destroyed, there may be lingering
157 // references to the constant by other constants in the constant pool. These
158 // constants are implicitly dependent on the module that is being deleted,
159 // but they don't know that. Because we only find out when the CPV is
160 // deleted, we must now notify all of our users (that should only be
161 // Constants) that they are, in fact, invalid now and should be deleted.
163 while (!use_empty()) {
164 Value *V = use_back();
165 #ifndef NDEBUG // Only in -g mode...
166 if (!isa<Constant>(V)) {
167 dbgs() << "While deleting: " << *this
168 << "\n\nUse still stuck around after Def is destroyed: "
172 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
173 Constant *CV = cast<Constant>(V);
174 CV->destroyConstant();
176 // The constant should remove itself from our use list...
177 assert((use_empty() || use_back() != V) && "Constant not removed!");
180 // Value has no outstanding references it is safe to delete it now...
184 /// canTrap - Return true if evaluation of this constant could trap. This is
185 /// true for things like constant expressions that could divide by zero.
186 bool Constant::canTrap() const {
187 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
188 // The only thing that could possibly trap are constant exprs.
189 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
190 if (!CE) return false;
192 // ConstantExpr traps if any operands can trap.
193 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
194 if (CE->getOperand(i)->canTrap())
197 // Otherwise, only specific operations can trap.
198 switch (CE->getOpcode()) {
201 case Instruction::UDiv:
202 case Instruction::SDiv:
203 case Instruction::FDiv:
204 case Instruction::URem:
205 case Instruction::SRem:
206 case Instruction::FRem:
207 // Div and rem can trap if the RHS is not known to be non-zero.
208 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
214 /// isConstantUsed - Return true if the constant has users other than constant
215 /// exprs and other dangling things.
216 bool Constant::isConstantUsed() const {
217 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
218 const Constant *UC = dyn_cast<Constant>(*UI);
219 if (UC == 0 || isa<GlobalValue>(UC))
222 if (UC->isConstantUsed())
230 /// getRelocationInfo - This method classifies the entry according to
231 /// whether or not it may generate a relocation entry. This must be
232 /// conservative, so if it might codegen to a relocatable entry, it should say
233 /// so. The return values are:
235 /// NoRelocation: This constant pool entry is guaranteed to never have a
236 /// relocation applied to it (because it holds a simple constant like
238 /// LocalRelocation: This entry has relocations, but the entries are
239 /// guaranteed to be resolvable by the static linker, so the dynamic
240 /// linker will never see them.
241 /// GlobalRelocations: This entry may have arbitrary relocations.
243 /// FIXME: This really should not be in VMCore.
244 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
245 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
246 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
247 return LocalRelocation; // Local to this file/library.
248 return GlobalRelocations; // Global reference.
251 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
252 return BA->getFunction()->getRelocationInfo();
254 // While raw uses of blockaddress need to be relocated, differences between
255 // two of them don't when they are for labels in the same function. This is a
256 // common idiom when creating a table for the indirect goto extension, so we
257 // handle it efficiently here.
258 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
259 if (CE->getOpcode() == Instruction::Sub) {
260 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
261 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
263 LHS->getOpcode() == Instruction::PtrToInt &&
264 RHS->getOpcode() == Instruction::PtrToInt &&
265 isa<BlockAddress>(LHS->getOperand(0)) &&
266 isa<BlockAddress>(RHS->getOperand(0)) &&
267 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
268 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
272 PossibleRelocationsTy Result = NoRelocation;
273 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
274 Result = std::max(Result,
275 cast<Constant>(getOperand(i))->getRelocationInfo());
281 /// getVectorElements - This method, which is only valid on constant of vector
282 /// type, returns the elements of the vector in the specified smallvector.
283 /// This handles breaking down a vector undef into undef elements, etc. For
284 /// constant exprs and other cases we can't handle, we return an empty vector.
285 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
286 assert(getType()->isVectorTy() && "Not a vector constant!");
288 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
289 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
290 Elts.push_back(CV->getOperand(i));
294 VectorType *VT = cast<VectorType>(getType());
295 if (isa<ConstantAggregateZero>(this)) {
296 Elts.assign(VT->getNumElements(),
297 Constant::getNullValue(VT->getElementType()));
301 if (isa<UndefValue>(this)) {
302 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
306 // Unknown type, must be constant expr etc.
310 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
311 /// it. This involves recursively eliminating any dead users of the
313 static bool removeDeadUsersOfConstant(const Constant *C) {
314 if (isa<GlobalValue>(C)) return false; // Cannot remove this
316 while (!C->use_empty()) {
317 const Constant *User = dyn_cast<Constant>(C->use_back());
318 if (!User) return false; // Non-constant usage;
319 if (!removeDeadUsersOfConstant(User))
320 return false; // Constant wasn't dead
323 const_cast<Constant*>(C)->destroyConstant();
328 /// removeDeadConstantUsers - If there are any dead constant users dangling
329 /// off of this constant, remove them. This method is useful for clients
330 /// that want to check to see if a global is unused, but don't want to deal
331 /// with potentially dead constants hanging off of the globals.
332 void Constant::removeDeadConstantUsers() const {
333 Value::const_use_iterator I = use_begin(), E = use_end();
334 Value::const_use_iterator LastNonDeadUser = E;
336 const Constant *User = dyn_cast<Constant>(*I);
343 if (!removeDeadUsersOfConstant(User)) {
344 // If the constant wasn't dead, remember that this was the last live use
345 // and move on to the next constant.
351 // If the constant was dead, then the iterator is invalidated.
352 if (LastNonDeadUser == E) {
364 //===----------------------------------------------------------------------===//
366 //===----------------------------------------------------------------------===//
368 void ConstantInt::anchor() { }
370 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
371 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
372 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
375 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
376 LLVMContextImpl *pImpl = Context.pImpl;
377 if (!pImpl->TheTrueVal)
378 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
379 return pImpl->TheTrueVal;
382 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
383 LLVMContextImpl *pImpl = Context.pImpl;
384 if (!pImpl->TheFalseVal)
385 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
386 return pImpl->TheFalseVal;
389 Constant *ConstantInt::getTrue(Type *Ty) {
390 VectorType *VTy = dyn_cast<VectorType>(Ty);
392 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
393 return ConstantInt::getTrue(Ty->getContext());
395 assert(VTy->getElementType()->isIntegerTy(1) &&
396 "True must be vector of i1 or i1.");
397 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
398 ConstantInt::getTrue(Ty->getContext()));
399 return ConstantVector::get(Splat);
402 Constant *ConstantInt::getFalse(Type *Ty) {
403 VectorType *VTy = dyn_cast<VectorType>(Ty);
405 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
406 return ConstantInt::getFalse(Ty->getContext());
408 assert(VTy->getElementType()->isIntegerTy(1) &&
409 "False must be vector of i1 or i1.");
410 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
411 ConstantInt::getFalse(Ty->getContext()));
412 return ConstantVector::get(Splat);
416 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
417 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
418 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
419 // compare APInt's of different widths, which would violate an APInt class
420 // invariant which generates an assertion.
421 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
422 // Get the corresponding integer type for the bit width of the value.
423 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
424 // get an existing value or the insertion position
425 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
426 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
427 if (!Slot) Slot = new ConstantInt(ITy, V);
431 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
432 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
434 // For vectors, broadcast the value.
435 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
436 return ConstantVector::get(SmallVector<Constant*,
437 16>(VTy->getNumElements(), C));
442 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
444 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
447 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
448 return get(Ty, V, true);
451 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
452 return get(Ty, V, true);
455 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
456 ConstantInt *C = get(Ty->getContext(), V);
457 assert(C->getType() == Ty->getScalarType() &&
458 "ConstantInt type doesn't match the type implied by its value!");
460 // For vectors, broadcast the value.
461 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
462 return ConstantVector::get(
463 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
468 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
470 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
473 //===----------------------------------------------------------------------===//
475 //===----------------------------------------------------------------------===//
477 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
479 return &APFloat::IEEEhalf;
481 return &APFloat::IEEEsingle;
482 if (Ty->isDoubleTy())
483 return &APFloat::IEEEdouble;
484 if (Ty->isX86_FP80Ty())
485 return &APFloat::x87DoubleExtended;
486 else if (Ty->isFP128Ty())
487 return &APFloat::IEEEquad;
489 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
490 return &APFloat::PPCDoubleDouble;
493 void ConstantFP::anchor() { }
495 /// get() - This returns a constant fp for the specified value in the
496 /// specified type. This should only be used for simple constant values like
497 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
498 Constant *ConstantFP::get(Type* Ty, double V) {
499 LLVMContext &Context = Ty->getContext();
503 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
504 APFloat::rmNearestTiesToEven, &ignored);
505 Constant *C = get(Context, FV);
507 // For vectors, broadcast the value.
508 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
509 return ConstantVector::get(
510 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
516 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
517 LLVMContext &Context = Ty->getContext();
519 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
520 Constant *C = get(Context, FV);
522 // For vectors, broadcast the value.
523 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
524 return ConstantVector::get(
525 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
531 ConstantFP* ConstantFP::getNegativeZero(Type* Ty) {
532 LLVMContext &Context = Ty->getContext();
533 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
535 return get(Context, apf);
539 Constant *ConstantFP::getZeroValueForNegation(Type* Ty) {
540 if (VectorType *PTy = dyn_cast<VectorType>(Ty))
541 if (PTy->getElementType()->isFloatingPointTy()) {
542 SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
543 getNegativeZero(PTy->getElementType()));
544 return ConstantVector::get(zeros);
547 if (Ty->isFloatingPointTy())
548 return getNegativeZero(Ty);
550 return Constant::getNullValue(Ty);
554 // ConstantFP accessors.
555 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
556 DenseMapAPFloatKeyInfo::KeyTy Key(V);
558 LLVMContextImpl* pImpl = Context.pImpl;
560 ConstantFP *&Slot = pImpl->FPConstants[Key];
564 if (&V.getSemantics() == &APFloat::IEEEhalf)
565 Ty = Type::getHalfTy(Context);
566 else if (&V.getSemantics() == &APFloat::IEEEsingle)
567 Ty = Type::getFloatTy(Context);
568 else if (&V.getSemantics() == &APFloat::IEEEdouble)
569 Ty = Type::getDoubleTy(Context);
570 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
571 Ty = Type::getX86_FP80Ty(Context);
572 else if (&V.getSemantics() == &APFloat::IEEEquad)
573 Ty = Type::getFP128Ty(Context);
575 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
576 "Unknown FP format");
577 Ty = Type::getPPC_FP128Ty(Context);
579 Slot = new ConstantFP(Ty, V);
585 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
586 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
587 return ConstantFP::get(Ty->getContext(),
588 APFloat::getInf(Semantics, Negative));
591 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
592 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
593 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
597 bool ConstantFP::isExactlyValue(const APFloat &V) const {
598 return Val.bitwiseIsEqual(V);
601 //===----------------------------------------------------------------------===//
602 // ConstantXXX Classes
603 //===----------------------------------------------------------------------===//
606 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
607 : Constant(T, ConstantArrayVal,
608 OperandTraits<ConstantArray>::op_end(this) - V.size(),
610 assert(V.size() == T->getNumElements() &&
611 "Invalid initializer vector for constant array");
612 for (unsigned i = 0, e = V.size(); i != e; ++i)
613 assert(V[i]->getType() == T->getElementType() &&
614 "Initializer for array element doesn't match array element type!");
615 std::copy(V.begin(), V.end(), op_begin());
618 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
619 for (unsigned i = 0, e = V.size(); i != e; ++i) {
620 assert(V[i]->getType() == Ty->getElementType() &&
621 "Wrong type in array element initializer");
623 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
624 // If this is an all-zero array, return a ConstantAggregateZero object
627 if (!C->isNullValue())
628 return pImpl->ArrayConstants.getOrCreate(Ty, V);
630 for (unsigned i = 1, e = V.size(); i != e; ++i)
632 return pImpl->ArrayConstants.getOrCreate(Ty, V);
635 return ConstantAggregateZero::get(Ty);
638 /// ConstantArray::get(const string&) - Return an array that is initialized to
639 /// contain the specified string. If length is zero then a null terminator is
640 /// added to the specified string so that it may be used in a natural way.
641 /// Otherwise, the length parameter specifies how much of the string to use
642 /// and it won't be null terminated.
644 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
646 std::vector<Constant*> ElementVals;
647 ElementVals.reserve(Str.size() + size_t(AddNull));
648 for (unsigned i = 0; i < Str.size(); ++i)
649 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
651 // Add a null terminator to the string...
653 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
656 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
657 return get(ATy, ElementVals);
660 /// getTypeForElements - Return an anonymous struct type to use for a constant
661 /// with the specified set of elements. The list must not be empty.
662 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
663 ArrayRef<Constant*> V,
665 SmallVector<Type*, 16> EltTypes;
666 for (unsigned i = 0, e = V.size(); i != e; ++i)
667 EltTypes.push_back(V[i]->getType());
669 return StructType::get(Context, EltTypes, Packed);
673 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
676 "ConstantStruct::getTypeForElements cannot be called on empty list");
677 return getTypeForElements(V[0]->getContext(), V, Packed);
681 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
682 : Constant(T, ConstantStructVal,
683 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
685 assert(V.size() == T->getNumElements() &&
686 "Invalid initializer vector for constant structure");
687 for (unsigned i = 0, e = V.size(); i != e; ++i)
688 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
689 "Initializer for struct element doesn't match struct element type!");
690 std::copy(V.begin(), V.end(), op_begin());
693 // ConstantStruct accessors.
694 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
695 // Create a ConstantAggregateZero value if all elements are zeros.
696 for (unsigned i = 0, e = V.size(); i != e; ++i)
697 if (!V[i]->isNullValue())
698 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
700 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
701 "Incorrect # elements specified to ConstantStruct::get");
702 return ConstantAggregateZero::get(ST);
705 Constant *ConstantStruct::get(StructType *T, ...) {
707 SmallVector<Constant*, 8> Values;
709 while (Constant *Val = va_arg(ap, llvm::Constant*))
710 Values.push_back(Val);
712 return get(T, Values);
715 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
716 : Constant(T, ConstantVectorVal,
717 OperandTraits<ConstantVector>::op_end(this) - V.size(),
719 for (size_t i = 0, e = V.size(); i != e; i++)
720 assert(V[i]->getType() == T->getElementType() &&
721 "Initializer for vector element doesn't match vector element type!");
722 std::copy(V.begin(), V.end(), op_begin());
725 // ConstantVector accessors.
726 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
727 assert(!V.empty() && "Vectors can't be empty");
728 VectorType *T = VectorType::get(V.front()->getType(), V.size());
729 LLVMContextImpl *pImpl = T->getContext().pImpl;
731 // If this is an all-undef or all-zero vector, return a
732 // ConstantAggregateZero or UndefValue.
734 bool isZero = C->isNullValue();
735 bool isUndef = isa<UndefValue>(C);
737 if (isZero || isUndef) {
738 for (unsigned i = 1, e = V.size(); i != e; ++i)
740 isZero = isUndef = false;
746 return ConstantAggregateZero::get(T);
748 return UndefValue::get(T);
750 return pImpl->VectorConstants.getOrCreate(T, V);
753 // Utility function for determining if a ConstantExpr is a CastOp or not. This
754 // can't be inline because we don't want to #include Instruction.h into
756 bool ConstantExpr::isCast() const {
757 return Instruction::isCast(getOpcode());
760 bool ConstantExpr::isCompare() const {
761 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
764 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
765 if (getOpcode() != Instruction::GetElementPtr) return false;
767 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
768 User::const_op_iterator OI = llvm::next(this->op_begin());
770 // Skip the first index, as it has no static limit.
774 // The remaining indices must be compile-time known integers within the
775 // bounds of the corresponding notional static array types.
776 for (; GEPI != E; ++GEPI, ++OI) {
777 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
778 if (!CI) return false;
779 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
780 if (CI->getValue().getActiveBits() > 64 ||
781 CI->getZExtValue() >= ATy->getNumElements())
785 // All the indices checked out.
789 bool ConstantExpr::hasIndices() const {
790 return getOpcode() == Instruction::ExtractValue ||
791 getOpcode() == Instruction::InsertValue;
794 ArrayRef<unsigned> ConstantExpr::getIndices() const {
795 if (const ExtractValueConstantExpr *EVCE =
796 dyn_cast<ExtractValueConstantExpr>(this))
797 return EVCE->Indices;
799 return cast<InsertValueConstantExpr>(this)->Indices;
802 unsigned ConstantExpr::getPredicate() const {
804 return ((const CompareConstantExpr*)this)->predicate;
807 /// getWithOperandReplaced - Return a constant expression identical to this
808 /// one, but with the specified operand set to the specified value.
810 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
811 assert(OpNo < getNumOperands() && "Operand num is out of range!");
812 assert(Op->getType() == getOperand(OpNo)->getType() &&
813 "Replacing operand with value of different type!");
814 if (getOperand(OpNo) == Op)
815 return const_cast<ConstantExpr*>(this);
817 Constant *Op0, *Op1, *Op2;
818 switch (getOpcode()) {
819 case Instruction::Trunc:
820 case Instruction::ZExt:
821 case Instruction::SExt:
822 case Instruction::FPTrunc:
823 case Instruction::FPExt:
824 case Instruction::UIToFP:
825 case Instruction::SIToFP:
826 case Instruction::FPToUI:
827 case Instruction::FPToSI:
828 case Instruction::PtrToInt:
829 case Instruction::IntToPtr:
830 case Instruction::BitCast:
831 return ConstantExpr::getCast(getOpcode(), Op, getType());
832 case Instruction::Select:
833 Op0 = (OpNo == 0) ? Op : getOperand(0);
834 Op1 = (OpNo == 1) ? Op : getOperand(1);
835 Op2 = (OpNo == 2) ? Op : getOperand(2);
836 return ConstantExpr::getSelect(Op0, Op1, Op2);
837 case Instruction::InsertElement:
838 Op0 = (OpNo == 0) ? Op : getOperand(0);
839 Op1 = (OpNo == 1) ? Op : getOperand(1);
840 Op2 = (OpNo == 2) ? Op : getOperand(2);
841 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
842 case Instruction::ExtractElement:
843 Op0 = (OpNo == 0) ? Op : getOperand(0);
844 Op1 = (OpNo == 1) ? Op : getOperand(1);
845 return ConstantExpr::getExtractElement(Op0, Op1);
846 case Instruction::ShuffleVector:
847 Op0 = (OpNo == 0) ? Op : getOperand(0);
848 Op1 = (OpNo == 1) ? Op : getOperand(1);
849 Op2 = (OpNo == 2) ? Op : getOperand(2);
850 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
851 case Instruction::GetElementPtr: {
852 SmallVector<Constant*, 8> Ops;
853 Ops.resize(getNumOperands()-1);
854 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
855 Ops[i-1] = getOperand(i);
858 ConstantExpr::getGetElementPtr(Op, Ops,
859 cast<GEPOperator>(this)->isInBounds());
862 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
863 cast<GEPOperator>(this)->isInBounds());
866 assert(getNumOperands() == 2 && "Must be binary operator?");
867 Op0 = (OpNo == 0) ? Op : getOperand(0);
868 Op1 = (OpNo == 1) ? Op : getOperand(1);
869 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
873 /// getWithOperands - This returns the current constant expression with the
874 /// operands replaced with the specified values. The specified array must
875 /// have the same number of operands as our current one.
876 Constant *ConstantExpr::
877 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
878 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
879 bool AnyChange = Ty != getType();
880 for (unsigned i = 0; i != Ops.size(); ++i)
881 AnyChange |= Ops[i] != getOperand(i);
883 if (!AnyChange) // No operands changed, return self.
884 return const_cast<ConstantExpr*>(this);
886 switch (getOpcode()) {
887 case Instruction::Trunc:
888 case Instruction::ZExt:
889 case Instruction::SExt:
890 case Instruction::FPTrunc:
891 case Instruction::FPExt:
892 case Instruction::UIToFP:
893 case Instruction::SIToFP:
894 case Instruction::FPToUI:
895 case Instruction::FPToSI:
896 case Instruction::PtrToInt:
897 case Instruction::IntToPtr:
898 case Instruction::BitCast:
899 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
900 case Instruction::Select:
901 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
902 case Instruction::InsertElement:
903 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
904 case Instruction::ExtractElement:
905 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
906 case Instruction::ShuffleVector:
907 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
908 case Instruction::GetElementPtr:
910 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
911 cast<GEPOperator>(this)->isInBounds());
912 case Instruction::ICmp:
913 case Instruction::FCmp:
914 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
916 assert(getNumOperands() == 2 && "Must be binary operator?");
917 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
922 //===----------------------------------------------------------------------===//
923 // isValueValidForType implementations
925 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
926 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
927 if (Ty == Type::getInt1Ty(Ty->getContext()))
928 return Val == 0 || Val == 1;
930 return true; // always true, has to fit in largest type
931 uint64_t Max = (1ll << NumBits) - 1;
935 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
936 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
937 if (Ty == Type::getInt1Ty(Ty->getContext()))
938 return Val == 0 || Val == 1 || Val == -1;
940 return true; // always true, has to fit in largest type
941 int64_t Min = -(1ll << (NumBits-1));
942 int64_t Max = (1ll << (NumBits-1)) - 1;
943 return (Val >= Min && Val <= Max);
946 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
947 // convert modifies in place, so make a copy.
948 APFloat Val2 = APFloat(Val);
950 switch (Ty->getTypeID()) {
952 return false; // These can't be represented as floating point!
954 // FIXME rounding mode needs to be more flexible
955 case Type::HalfTyID: {
956 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
958 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
961 case Type::FloatTyID: {
962 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
964 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
967 case Type::DoubleTyID: {
968 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
969 &Val2.getSemantics() == &APFloat::IEEEsingle ||
970 &Val2.getSemantics() == &APFloat::IEEEdouble)
972 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
975 case Type::X86_FP80TyID:
976 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
977 &Val2.getSemantics() == &APFloat::IEEEsingle ||
978 &Val2.getSemantics() == &APFloat::IEEEdouble ||
979 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
980 case Type::FP128TyID:
981 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
982 &Val2.getSemantics() == &APFloat::IEEEsingle ||
983 &Val2.getSemantics() == &APFloat::IEEEdouble ||
984 &Val2.getSemantics() == &APFloat::IEEEquad;
985 case Type::PPC_FP128TyID:
986 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
987 &Val2.getSemantics() == &APFloat::IEEEsingle ||
988 &Val2.getSemantics() == &APFloat::IEEEdouble ||
989 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
993 //===----------------------------------------------------------------------===//
994 // Factory Function Implementation
996 ConstantAggregateZero* ConstantAggregateZero::get(Type* Ty) {
997 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
998 "Cannot create an aggregate zero of non-aggregate type!");
1000 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1001 return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
1004 /// destroyConstant - Remove the constant from the constant table...
1006 void ConstantAggregateZero::destroyConstant() {
1007 getType()->getContext().pImpl->AggZeroConstants.remove(this);
1008 destroyConstantImpl();
1011 /// destroyConstant - Remove the constant from the constant table...
1013 void ConstantArray::destroyConstant() {
1014 getType()->getContext().pImpl->ArrayConstants.remove(this);
1015 destroyConstantImpl();
1018 /// isString - This method returns true if the array is an array of i8, and
1019 /// if the elements of the array are all ConstantInt's.
1020 bool ConstantArray::isString() const {
1021 // Check the element type for i8...
1022 if (!getType()->getElementType()->isIntegerTy(8))
1024 // Check the elements to make sure they are all integers, not constant
1026 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1027 if (!isa<ConstantInt>(getOperand(i)))
1032 /// isCString - This method returns true if the array is a string (see
1033 /// isString) and it ends in a null byte \\0 and does not contains any other
1034 /// null bytes except its terminator.
1035 bool ConstantArray::isCString() const {
1036 // Check the element type for i8...
1037 if (!getType()->getElementType()->isIntegerTy(8))
1040 // Last element must be a null.
1041 if (!getOperand(getNumOperands()-1)->isNullValue())
1043 // Other elements must be non-null integers.
1044 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1045 if (!isa<ConstantInt>(getOperand(i)))
1047 if (getOperand(i)->isNullValue())
1054 /// convertToString - Helper function for getAsString() and getAsCString().
1055 static std::string convertToString(const User *U, unsigned len) {
1057 Result.reserve(len);
1058 for (unsigned i = 0; i != len; ++i)
1059 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1063 /// getAsString - If this array is isString(), then this method converts the
1064 /// array to an std::string and returns it. Otherwise, it asserts out.
1066 std::string ConstantArray::getAsString() const {
1067 assert(isString() && "Not a string!");
1068 return convertToString(this, getNumOperands());
1072 /// getAsCString - If this array is isCString(), then this method converts the
1073 /// array (without the trailing null byte) to an std::string and returns it.
1074 /// Otherwise, it asserts out.
1076 std::string ConstantArray::getAsCString() const {
1077 assert(isCString() && "Not a string!");
1078 return convertToString(this, getNumOperands() - 1);
1082 //---- ConstantStruct::get() implementation...
1085 // destroyConstant - Remove the constant from the constant table...
1087 void ConstantStruct::destroyConstant() {
1088 getType()->getContext().pImpl->StructConstants.remove(this);
1089 destroyConstantImpl();
1092 // destroyConstant - Remove the constant from the constant table...
1094 void ConstantVector::destroyConstant() {
1095 getType()->getContext().pImpl->VectorConstants.remove(this);
1096 destroyConstantImpl();
1099 /// getSplatValue - If this is a splat constant, where all of the
1100 /// elements have the same value, return that value. Otherwise return null.
1101 Constant *ConstantVector::getSplatValue() const {
1102 // Check out first element.
1103 Constant *Elt = getOperand(0);
1104 // Then make sure all remaining elements point to the same value.
1105 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1106 if (getOperand(I) != Elt)
1111 //---- ConstantPointerNull::get() implementation.
1114 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1115 return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
1118 // destroyConstant - Remove the constant from the constant table...
1120 void ConstantPointerNull::destroyConstant() {
1121 getType()->getContext().pImpl->NullPtrConstants.remove(this);
1122 destroyConstantImpl();
1126 //---- UndefValue::get() implementation.
1129 UndefValue *UndefValue::get(Type *Ty) {
1130 return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
1133 // destroyConstant - Remove the constant from the constant table.
1135 void UndefValue::destroyConstant() {
1136 getType()->getContext().pImpl->UndefValueConstants.remove(this);
1137 destroyConstantImpl();
1140 //---- BlockAddress::get() implementation.
1143 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1144 assert(BB->getParent() != 0 && "Block must have a parent");
1145 return get(BB->getParent(), BB);
1148 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1150 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1152 BA = new BlockAddress(F, BB);
1154 assert(BA->getFunction() == F && "Basic block moved between functions");
1158 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1159 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1163 BB->AdjustBlockAddressRefCount(1);
1167 // destroyConstant - Remove the constant from the constant table.
1169 void BlockAddress::destroyConstant() {
1170 getFunction()->getType()->getContext().pImpl
1171 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1172 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1173 destroyConstantImpl();
1176 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1177 // This could be replacing either the Basic Block or the Function. In either
1178 // case, we have to remove the map entry.
1179 Function *NewF = getFunction();
1180 BasicBlock *NewBB = getBasicBlock();
1183 NewF = cast<Function>(To);
1185 NewBB = cast<BasicBlock>(To);
1187 // See if the 'new' entry already exists, if not, just update this in place
1188 // and return early.
1189 BlockAddress *&NewBA =
1190 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1192 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1194 // Remove the old entry, this can't cause the map to rehash (just a
1195 // tombstone will get added).
1196 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1199 setOperand(0, NewF);
1200 setOperand(1, NewBB);
1201 getBasicBlock()->AdjustBlockAddressRefCount(1);
1205 // Otherwise, I do need to replace this with an existing value.
1206 assert(NewBA != this && "I didn't contain From!");
1208 // Everyone using this now uses the replacement.
1209 replaceAllUsesWith(NewBA);
1214 //---- ConstantExpr::get() implementations.
1217 /// This is a utility function to handle folding of casts and lookup of the
1218 /// cast in the ExprConstants map. It is used by the various get* methods below.
1219 static inline Constant *getFoldedCast(
1220 Instruction::CastOps opc, Constant *C, Type *Ty) {
1221 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1222 // Fold a few common cases
1223 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1226 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1228 // Look up the constant in the table first to ensure uniqueness
1229 std::vector<Constant*> argVec(1, C);
1230 ExprMapKeyType Key(opc, argVec);
1232 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1235 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1236 Instruction::CastOps opc = Instruction::CastOps(oc);
1237 assert(Instruction::isCast(opc) && "opcode out of range");
1238 assert(C && Ty && "Null arguments to getCast");
1239 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1243 llvm_unreachable("Invalid cast opcode");
1245 case Instruction::Trunc: return getTrunc(C, Ty);
1246 case Instruction::ZExt: return getZExt(C, Ty);
1247 case Instruction::SExt: return getSExt(C, Ty);
1248 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1249 case Instruction::FPExt: return getFPExtend(C, Ty);
1250 case Instruction::UIToFP: return getUIToFP(C, Ty);
1251 case Instruction::SIToFP: return getSIToFP(C, Ty);
1252 case Instruction::FPToUI: return getFPToUI(C, Ty);
1253 case Instruction::FPToSI: return getFPToSI(C, Ty);
1254 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1255 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1256 case Instruction::BitCast: return getBitCast(C, Ty);
1261 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1262 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1263 return getBitCast(C, Ty);
1264 return getZExt(C, Ty);
1267 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1268 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1269 return getBitCast(C, Ty);
1270 return getSExt(C, Ty);
1273 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1274 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1275 return getBitCast(C, Ty);
1276 return getTrunc(C, Ty);
1279 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1280 assert(S->getType()->isPointerTy() && "Invalid cast");
1281 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1283 if (Ty->isIntegerTy())
1284 return getPtrToInt(S, Ty);
1285 return getBitCast(S, Ty);
1288 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1290 assert(C->getType()->isIntOrIntVectorTy() &&
1291 Ty->isIntOrIntVectorTy() && "Invalid cast");
1292 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1293 unsigned DstBits = Ty->getScalarSizeInBits();
1294 Instruction::CastOps opcode =
1295 (SrcBits == DstBits ? Instruction::BitCast :
1296 (SrcBits > DstBits ? Instruction::Trunc :
1297 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1298 return getCast(opcode, C, Ty);
1301 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1302 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1304 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1305 unsigned DstBits = Ty->getScalarSizeInBits();
1306 if (SrcBits == DstBits)
1307 return C; // Avoid a useless cast
1308 Instruction::CastOps opcode =
1309 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1310 return getCast(opcode, C, Ty);
1313 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1315 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1316 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1318 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1319 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1320 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1321 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1322 "SrcTy must be larger than DestTy for Trunc!");
1324 return getFoldedCast(Instruction::Trunc, C, Ty);
1327 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1329 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1330 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1332 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1333 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1334 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1335 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1336 "SrcTy must be smaller than DestTy for SExt!");
1338 return getFoldedCast(Instruction::SExt, C, Ty);
1341 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1343 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1344 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1346 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1347 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1348 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1349 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1350 "SrcTy must be smaller than DestTy for ZExt!");
1352 return getFoldedCast(Instruction::ZExt, C, Ty);
1355 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1357 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1358 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1360 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1361 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1362 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1363 "This is an illegal floating point truncation!");
1364 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1367 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1369 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1370 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1372 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1373 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1374 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1375 "This is an illegal floating point extension!");
1376 return getFoldedCast(Instruction::FPExt, C, Ty);
1379 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1381 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1382 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1384 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1385 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1386 "This is an illegal uint to floating point cast!");
1387 return getFoldedCast(Instruction::UIToFP, C, Ty);
1390 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1392 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1393 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1395 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1396 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1397 "This is an illegal sint to floating point cast!");
1398 return getFoldedCast(Instruction::SIToFP, C, Ty);
1401 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1403 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1404 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1406 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1407 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1408 "This is an illegal floating point to uint cast!");
1409 return getFoldedCast(Instruction::FPToUI, C, Ty);
1412 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1414 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1415 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1417 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1418 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1419 "This is an illegal floating point to sint cast!");
1420 return getFoldedCast(Instruction::FPToSI, C, Ty);
1423 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1424 assert(C->getType()->getScalarType()->isPointerTy() &&
1425 "PtrToInt source must be pointer or pointer vector");
1426 assert(DstTy->getScalarType()->isIntegerTy() &&
1427 "PtrToInt destination must be integer or integer vector");
1428 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1429 "Invalid cast between a different number of vector elements");
1430 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1433 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1434 assert(C->getType()->getScalarType()->isIntegerTy() &&
1435 "IntToPtr source must be integer or integer vector");
1436 assert(DstTy->getScalarType()->isPointerTy() &&
1437 "IntToPtr destination must be a pointer or pointer vector");
1438 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1439 "Invalid cast between a different number of vector elements");
1440 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1443 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1444 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1445 "Invalid constantexpr bitcast!");
1447 // It is common to ask for a bitcast of a value to its own type, handle this
1449 if (C->getType() == DstTy) return C;
1451 return getFoldedCast(Instruction::BitCast, C, DstTy);
1454 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1456 // Check the operands for consistency first.
1457 assert(Opcode >= Instruction::BinaryOpsBegin &&
1458 Opcode < Instruction::BinaryOpsEnd &&
1459 "Invalid opcode in binary constant expression");
1460 assert(C1->getType() == C2->getType() &&
1461 "Operand types in binary constant expression should match");
1465 case Instruction::Add:
1466 case Instruction::Sub:
1467 case Instruction::Mul:
1468 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1469 assert(C1->getType()->isIntOrIntVectorTy() &&
1470 "Tried to create an integer operation on a non-integer type!");
1472 case Instruction::FAdd:
1473 case Instruction::FSub:
1474 case Instruction::FMul:
1475 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1476 assert(C1->getType()->isFPOrFPVectorTy() &&
1477 "Tried to create a floating-point operation on a "
1478 "non-floating-point type!");
1480 case Instruction::UDiv:
1481 case Instruction::SDiv:
1482 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1483 assert(C1->getType()->isIntOrIntVectorTy() &&
1484 "Tried to create an arithmetic operation on a non-arithmetic type!");
1486 case Instruction::FDiv:
1487 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1488 assert(C1->getType()->isFPOrFPVectorTy() &&
1489 "Tried to create an arithmetic operation on a non-arithmetic type!");
1491 case Instruction::URem:
1492 case Instruction::SRem:
1493 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1494 assert(C1->getType()->isIntOrIntVectorTy() &&
1495 "Tried to create an arithmetic operation on a non-arithmetic type!");
1497 case Instruction::FRem:
1498 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1499 assert(C1->getType()->isFPOrFPVectorTy() &&
1500 "Tried to create an arithmetic operation on a non-arithmetic type!");
1502 case Instruction::And:
1503 case Instruction::Or:
1504 case Instruction::Xor:
1505 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1506 assert(C1->getType()->isIntOrIntVectorTy() &&
1507 "Tried to create a logical operation on a non-integral type!");
1509 case Instruction::Shl:
1510 case Instruction::LShr:
1511 case Instruction::AShr:
1512 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1513 assert(C1->getType()->isIntOrIntVectorTy() &&
1514 "Tried to create a shift operation on a non-integer type!");
1521 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1522 return FC; // Fold a few common cases.
1524 std::vector<Constant*> argVec(1, C1);
1525 argVec.push_back(C2);
1526 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1528 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1529 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1532 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1533 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1534 // Note that a non-inbounds gep is used, as null isn't within any object.
1535 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1536 Constant *GEP = getGetElementPtr(
1537 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1538 return getPtrToInt(GEP,
1539 Type::getInt64Ty(Ty->getContext()));
1542 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1543 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1544 // Note that a non-inbounds gep is used, as null isn't within any object.
1546 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1547 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1548 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1549 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1550 Constant *Indices[2] = { Zero, One };
1551 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1552 return getPtrToInt(GEP,
1553 Type::getInt64Ty(Ty->getContext()));
1556 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1557 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1561 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1562 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1563 // Note that a non-inbounds gep is used, as null isn't within any object.
1564 Constant *GEPIdx[] = {
1565 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1568 Constant *GEP = getGetElementPtr(
1569 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1570 return getPtrToInt(GEP,
1571 Type::getInt64Ty(Ty->getContext()));
1574 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1575 Constant *C1, Constant *C2) {
1576 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1578 switch (Predicate) {
1579 default: llvm_unreachable("Invalid CmpInst predicate");
1580 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1581 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1582 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1583 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1584 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1585 case CmpInst::FCMP_TRUE:
1586 return getFCmp(Predicate, C1, C2);
1588 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1589 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1590 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1591 case CmpInst::ICMP_SLE:
1592 return getICmp(Predicate, C1, C2);
1596 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1597 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1599 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1600 return SC; // Fold common cases
1602 std::vector<Constant*> argVec(3, C);
1605 ExprMapKeyType Key(Instruction::Select, argVec);
1607 LLVMContextImpl *pImpl = C->getContext().pImpl;
1608 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1611 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1613 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1614 return FC; // Fold a few common cases.
1616 // Get the result type of the getelementptr!
1617 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1618 assert(Ty && "GEP indices invalid!");
1619 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1620 Type *ReqTy = Ty->getPointerTo(AS);
1622 assert(C->getType()->isPointerTy() &&
1623 "Non-pointer type for constant GetElementPtr expression");
1624 // Look up the constant in the table first to ensure uniqueness
1625 std::vector<Constant*> ArgVec;
1626 ArgVec.reserve(1 + Idxs.size());
1627 ArgVec.push_back(C);
1628 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1629 ArgVec.push_back(cast<Constant>(Idxs[i]));
1630 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1631 InBounds ? GEPOperator::IsInBounds : 0);
1633 LLVMContextImpl *pImpl = C->getContext().pImpl;
1634 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1638 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1639 assert(LHS->getType() == RHS->getType());
1640 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1641 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1643 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1644 return FC; // Fold a few common cases...
1646 // Look up the constant in the table first to ensure uniqueness
1647 std::vector<Constant*> ArgVec;
1648 ArgVec.push_back(LHS);
1649 ArgVec.push_back(RHS);
1650 // Get the key type with both the opcode and predicate
1651 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1653 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1654 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1655 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1657 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1658 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1662 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1663 assert(LHS->getType() == RHS->getType());
1664 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1666 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1667 return FC; // Fold a few common cases...
1669 // Look up the constant in the table first to ensure uniqueness
1670 std::vector<Constant*> ArgVec;
1671 ArgVec.push_back(LHS);
1672 ArgVec.push_back(RHS);
1673 // Get the key type with both the opcode and predicate
1674 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1676 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1677 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1678 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1680 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1681 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1684 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1685 assert(Val->getType()->isVectorTy() &&
1686 "Tried to create extractelement operation on non-vector type!");
1687 assert(Idx->getType()->isIntegerTy(32) &&
1688 "Extractelement index must be i32 type!");
1690 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1691 return FC; // Fold a few common cases.
1693 // Look up the constant in the table first to ensure uniqueness
1694 std::vector<Constant*> ArgVec(1, Val);
1695 ArgVec.push_back(Idx);
1696 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1698 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1699 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1700 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1703 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1705 assert(Val->getType()->isVectorTy() &&
1706 "Tried to create insertelement operation on non-vector type!");
1707 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1708 && "Insertelement types must match!");
1709 assert(Idx->getType()->isIntegerTy(32) &&
1710 "Insertelement index must be i32 type!");
1712 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
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, Val);
1716 ArgVec.push_back(Elt);
1717 ArgVec.push_back(Idx);
1718 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1720 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1721 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1724 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1726 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1727 "Invalid shuffle vector constant expr operands!");
1729 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1730 return FC; // Fold a few common cases.
1732 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1733 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1734 Type *ShufTy = VectorType::get(EltTy, NElts);
1736 // Look up the constant in the table first to ensure uniqueness
1737 std::vector<Constant*> ArgVec(1, V1);
1738 ArgVec.push_back(V2);
1739 ArgVec.push_back(Mask);
1740 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1742 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1743 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1746 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1747 ArrayRef<unsigned> Idxs) {
1748 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1749 Idxs) == Val->getType() &&
1750 "insertvalue indices invalid!");
1751 assert(Agg->getType()->isFirstClassType() &&
1752 "Non-first-class type for constant insertvalue expression");
1753 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1754 assert(FC && "insertvalue constant expr couldn't be folded!");
1758 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1759 ArrayRef<unsigned> Idxs) {
1760 assert(Agg->getType()->isFirstClassType() &&
1761 "Tried to create extractelement operation on non-first-class type!");
1763 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1765 assert(ReqTy && "extractvalue indices invalid!");
1767 assert(Agg->getType()->isFirstClassType() &&
1768 "Non-first-class type for constant extractvalue expression");
1769 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1770 assert(FC && "ExtractValue constant expr couldn't be folded!");
1774 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1775 assert(C->getType()->isIntOrIntVectorTy() &&
1776 "Cannot NEG a nonintegral value!");
1777 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1781 Constant *ConstantExpr::getFNeg(Constant *C) {
1782 assert(C->getType()->isFPOrFPVectorTy() &&
1783 "Cannot FNEG a non-floating-point value!");
1784 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1787 Constant *ConstantExpr::getNot(Constant *C) {
1788 assert(C->getType()->isIntOrIntVectorTy() &&
1789 "Cannot NOT a nonintegral value!");
1790 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1793 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1794 bool HasNUW, bool HasNSW) {
1795 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1796 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1797 return get(Instruction::Add, C1, C2, Flags);
1800 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1801 return get(Instruction::FAdd, C1, C2);
1804 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1805 bool HasNUW, bool HasNSW) {
1806 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1807 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1808 return get(Instruction::Sub, C1, C2, Flags);
1811 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1812 return get(Instruction::FSub, C1, C2);
1815 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1816 bool HasNUW, bool HasNSW) {
1817 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1818 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1819 return get(Instruction::Mul, C1, C2, Flags);
1822 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1823 return get(Instruction::FMul, C1, C2);
1826 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1827 return get(Instruction::UDiv, C1, C2,
1828 isExact ? PossiblyExactOperator::IsExact : 0);
1831 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1832 return get(Instruction::SDiv, C1, C2,
1833 isExact ? PossiblyExactOperator::IsExact : 0);
1836 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1837 return get(Instruction::FDiv, C1, C2);
1840 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1841 return get(Instruction::URem, C1, C2);
1844 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1845 return get(Instruction::SRem, C1, C2);
1848 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1849 return get(Instruction::FRem, C1, C2);
1852 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1853 return get(Instruction::And, C1, C2);
1856 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1857 return get(Instruction::Or, C1, C2);
1860 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1861 return get(Instruction::Xor, C1, C2);
1864 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1865 bool HasNUW, bool HasNSW) {
1866 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1867 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1868 return get(Instruction::Shl, C1, C2, Flags);
1871 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1872 return get(Instruction::LShr, C1, C2,
1873 isExact ? PossiblyExactOperator::IsExact : 0);
1876 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1877 return get(Instruction::AShr, C1, C2,
1878 isExact ? PossiblyExactOperator::IsExact : 0);
1881 // destroyConstant - Remove the constant from the constant table...
1883 void ConstantExpr::destroyConstant() {
1884 getType()->getContext().pImpl->ExprConstants.remove(this);
1885 destroyConstantImpl();
1888 const char *ConstantExpr::getOpcodeName() const {
1889 return Instruction::getOpcodeName(getOpcode());
1894 GetElementPtrConstantExpr::
1895 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1897 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1898 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1899 - (IdxList.size()+1), IdxList.size()+1) {
1901 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1902 OperandList[i+1] = IdxList[i];
1906 //===----------------------------------------------------------------------===//
1907 // replaceUsesOfWithOnConstant implementations
1909 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
1910 /// 'From' to be uses of 'To'. This must update the uniquing data structures
1913 /// Note that we intentionally replace all uses of From with To here. Consider
1914 /// a large array that uses 'From' 1000 times. By handling this case all here,
1915 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
1916 /// single invocation handles all 1000 uses. Handling them one at a time would
1917 /// work, but would be really slow because it would have to unique each updated
1920 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
1922 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
1923 Constant *ToC = cast<Constant>(To);
1925 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
1927 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
1928 Lookup.first.first = cast<ArrayType>(getType());
1929 Lookup.second = this;
1931 std::vector<Constant*> &Values = Lookup.first.second;
1932 Values.reserve(getNumOperands()); // Build replacement array.
1934 // Fill values with the modified operands of the constant array. Also,
1935 // compute whether this turns into an all-zeros array.
1936 bool isAllZeros = false;
1937 unsigned NumUpdated = 0;
1938 if (!ToC->isNullValue()) {
1939 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
1940 Constant *Val = cast<Constant>(O->get());
1945 Values.push_back(Val);
1949 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
1950 Constant *Val = cast<Constant>(O->get());
1955 Values.push_back(Val);
1956 if (isAllZeros) isAllZeros = Val->isNullValue();
1960 Constant *Replacement = 0;
1962 Replacement = ConstantAggregateZero::get(getType());
1964 // Check to see if we have this array type already.
1966 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
1967 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
1970 Replacement = I->second;
1972 // Okay, the new shape doesn't exist in the system yet. Instead of
1973 // creating a new constant array, inserting it, replaceallusesof'ing the
1974 // old with the new, then deleting the old... just update the current one
1976 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
1978 // Update to the new value. Optimize for the case when we have a single
1979 // operand that we're changing, but handle bulk updates efficiently.
1980 if (NumUpdated == 1) {
1981 unsigned OperandToUpdate = U - OperandList;
1982 assert(getOperand(OperandToUpdate) == From &&
1983 "ReplaceAllUsesWith broken!");
1984 setOperand(OperandToUpdate, ToC);
1986 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1987 if (getOperand(i) == From)
1994 // Otherwise, I do need to replace this with an existing value.
1995 assert(Replacement != this && "I didn't contain From!");
1997 // Everyone using this now uses the replacement.
1998 replaceAllUsesWith(Replacement);
2000 // Delete the old constant!
2004 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2006 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2007 Constant *ToC = cast<Constant>(To);
2009 unsigned OperandToUpdate = U-OperandList;
2010 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2012 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2013 Lookup.first.first = cast<StructType>(getType());
2014 Lookup.second = this;
2015 std::vector<Constant*> &Values = Lookup.first.second;
2016 Values.reserve(getNumOperands()); // Build replacement struct.
2019 // Fill values with the modified operands of the constant struct. Also,
2020 // compute whether this turns into an all-zeros struct.
2021 bool isAllZeros = false;
2022 if (!ToC->isNullValue()) {
2023 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2024 Values.push_back(cast<Constant>(O->get()));
2027 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2028 Constant *Val = cast<Constant>(O->get());
2029 Values.push_back(Val);
2030 if (isAllZeros) isAllZeros = Val->isNullValue();
2033 Values[OperandToUpdate] = ToC;
2035 LLVMContextImpl *pImpl = getContext().pImpl;
2037 Constant *Replacement = 0;
2039 Replacement = ConstantAggregateZero::get(getType());
2041 // Check to see if we have this struct type already.
2043 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2044 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2047 Replacement = I->second;
2049 // Okay, the new shape doesn't exist in the system yet. Instead of
2050 // creating a new constant struct, inserting it, replaceallusesof'ing the
2051 // old with the new, then deleting the old... just update the current one
2053 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2055 // Update to the new value.
2056 setOperand(OperandToUpdate, ToC);
2061 assert(Replacement != this && "I didn't contain From!");
2063 // Everyone using this now uses the replacement.
2064 replaceAllUsesWith(Replacement);
2066 // Delete the old constant!
2070 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2072 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2074 std::vector<Constant*> Values;
2075 Values.reserve(getNumOperands()); // Build replacement array...
2076 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2077 Constant *Val = getOperand(i);
2078 if (Val == From) Val = cast<Constant>(To);
2079 Values.push_back(Val);
2082 Constant *Replacement = get(Values);
2083 assert(Replacement != this && "I didn't contain From!");
2085 // Everyone using this now uses the replacement.
2086 replaceAllUsesWith(Replacement);
2088 // Delete the old constant!
2092 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2094 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2095 Constant *To = cast<Constant>(ToV);
2097 Constant *Replacement = 0;
2098 if (getOpcode() == Instruction::GetElementPtr) {
2099 SmallVector<Constant*, 8> Indices;
2100 Constant *Pointer = getOperand(0);
2101 Indices.reserve(getNumOperands()-1);
2102 if (Pointer == From) Pointer = To;
2104 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2105 Constant *Val = getOperand(i);
2106 if (Val == From) Val = To;
2107 Indices.push_back(Val);
2109 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2110 cast<GEPOperator>(this)->isInBounds());
2111 } else if (getOpcode() == Instruction::ExtractValue) {
2112 Constant *Agg = getOperand(0);
2113 if (Agg == From) Agg = To;
2115 ArrayRef<unsigned> Indices = getIndices();
2116 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2117 } else if (getOpcode() == Instruction::InsertValue) {
2118 Constant *Agg = getOperand(0);
2119 Constant *Val = getOperand(1);
2120 if (Agg == From) Agg = To;
2121 if (Val == From) Val = To;
2123 ArrayRef<unsigned> Indices = getIndices();
2124 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
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, SubclassOptionalData);
2176 llvm_unreachable("Unknown ConstantExpr type!");
2180 assert(Replacement != this && "I didn't contain From!");
2182 // Everyone using this now uses the replacement.
2183 replaceAllUsesWith(Replacement);
2185 // Delete the old constant!