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();
81 // Check for constant vectors which are splats of -1 values.
82 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
83 if (Constant *Splat = CV->getSplatValue())
84 return Splat->isAllOnesValue();
89 // Constructor to create a '0' constant of arbitrary type...
90 Constant *Constant::getNullValue(Type *Ty) {
91 switch (Ty->getTypeID()) {
92 case Type::IntegerTyID:
93 return ConstantInt::get(Ty, 0);
95 return ConstantFP::get(Ty->getContext(),
96 APFloat::getZero(APFloat::IEEEhalf));
98 return ConstantFP::get(Ty->getContext(),
99 APFloat::getZero(APFloat::IEEEsingle));
100 case Type::DoubleTyID:
101 return ConstantFP::get(Ty->getContext(),
102 APFloat::getZero(APFloat::IEEEdouble));
103 case Type::X86_FP80TyID:
104 return ConstantFP::get(Ty->getContext(),
105 APFloat::getZero(APFloat::x87DoubleExtended));
106 case Type::FP128TyID:
107 return ConstantFP::get(Ty->getContext(),
108 APFloat::getZero(APFloat::IEEEquad));
109 case Type::PPC_FP128TyID:
110 return ConstantFP::get(Ty->getContext(),
111 APFloat(APInt::getNullValue(128)));
112 case Type::PointerTyID:
113 return ConstantPointerNull::get(cast<PointerType>(Ty));
114 case Type::StructTyID:
115 case Type::ArrayTyID:
116 case Type::VectorTyID:
117 return ConstantAggregateZero::get(Ty);
119 // Function, Label, or Opaque type?
120 llvm_unreachable("Cannot create a null constant of that type!");
124 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
125 Type *ScalarTy = Ty->getScalarType();
127 // Create the base integer constant.
128 Constant *C = ConstantInt::get(Ty->getContext(), V);
130 // Convert an integer to a pointer, if necessary.
131 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
132 C = ConstantExpr::getIntToPtr(C, PTy);
134 // Broadcast a scalar to a vector, if necessary.
135 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
136 C = ConstantVector::getSplat(VTy->getNumElements(), C);
141 Constant *Constant::getAllOnesValue(Type *Ty) {
142 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
143 return ConstantInt::get(Ty->getContext(),
144 APInt::getAllOnesValue(ITy->getBitWidth()));
146 if (Ty->isFloatingPointTy()) {
147 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
148 !Ty->isPPC_FP128Ty());
149 return ConstantFP::get(Ty->getContext(), FL);
152 VectorType *VTy = cast<VectorType>(Ty);
153 return ConstantVector::getSplat(VTy->getNumElements(),
154 getAllOnesValue(VTy->getElementType()));
157 /// getAggregateElement - For aggregates (struct/array/vector) return the
158 /// constant that corresponds to the specified element if possible, or null if
159 /// not. This can return null if the element index is a ConstantExpr, or if
160 /// 'this' is a constant expr.
161 Constant *Constant::getAggregateElement(unsigned Elt) const {
162 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
163 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
165 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
166 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
168 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
169 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
171 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
172 return CAZ->getElementValue(Elt);
174 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
175 return UV->getElementValue(Elt);
177 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
178 return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt) : 0;
182 Constant *Constant::getAggregateElement(Constant *Elt) const {
183 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
184 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
185 return getAggregateElement(CI->getZExtValue());
190 void Constant::destroyConstantImpl() {
191 // When a Constant is destroyed, there may be lingering
192 // references to the constant by other constants in the constant pool. These
193 // constants are implicitly dependent on the module that is being deleted,
194 // but they don't know that. Because we only find out when the CPV is
195 // deleted, we must now notify all of our users (that should only be
196 // Constants) that they are, in fact, invalid now and should be deleted.
198 while (!use_empty()) {
199 Value *V = use_back();
200 #ifndef NDEBUG // Only in -g mode...
201 if (!isa<Constant>(V)) {
202 dbgs() << "While deleting: " << *this
203 << "\n\nUse still stuck around after Def is destroyed: "
207 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
208 cast<Constant>(V)->destroyConstant();
210 // The constant should remove itself from our use list...
211 assert((use_empty() || use_back() != V) && "Constant not removed!");
214 // Value has no outstanding references it is safe to delete it now...
218 /// canTrap - Return true if evaluation of this constant could trap. This is
219 /// true for things like constant expressions that could divide by zero.
220 bool Constant::canTrap() const {
221 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
222 // The only thing that could possibly trap are constant exprs.
223 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
224 if (!CE) return false;
226 // ConstantExpr traps if any operands can trap.
227 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
228 if (CE->getOperand(i)->canTrap())
231 // Otherwise, only specific operations can trap.
232 switch (CE->getOpcode()) {
235 case Instruction::UDiv:
236 case Instruction::SDiv:
237 case Instruction::FDiv:
238 case Instruction::URem:
239 case Instruction::SRem:
240 case Instruction::FRem:
241 // Div and rem can trap if the RHS is not known to be non-zero.
242 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
248 /// isThreadDependent - Return true if the value can vary between threads.
249 bool Constant::isThreadDependent() const {
250 SmallPtrSet<const Constant*, 64> Visited;
251 SmallVector<const Constant*, 64> WorkList;
252 WorkList.push_back(this);
253 Visited.insert(this);
255 while (!WorkList.empty()) {
256 const Constant *C = WorkList.pop_back_val();
258 if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
259 if (GV->isThreadLocal())
263 for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
264 const Constant *D = dyn_cast<Constant>(C->getOperand(I));
267 if (Visited.insert(D))
268 WorkList.push_back(D);
275 /// isConstantUsed - Return true if the constant has users other than constant
276 /// exprs and other dangling things.
277 bool Constant::isConstantUsed() const {
278 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
279 const Constant *UC = dyn_cast<Constant>(*UI);
280 if (UC == 0 || isa<GlobalValue>(UC))
283 if (UC->isConstantUsed())
291 /// getRelocationInfo - This method classifies the entry according to
292 /// whether or not it may generate a relocation entry. This must be
293 /// conservative, so if it might codegen to a relocatable entry, it should say
294 /// so. The return values are:
296 /// NoRelocation: This constant pool entry is guaranteed to never have a
297 /// relocation applied to it (because it holds a simple constant like
299 /// LocalRelocation: This entry has relocations, but the entries are
300 /// guaranteed to be resolvable by the static linker, so the dynamic
301 /// linker will never see them.
302 /// GlobalRelocations: This entry may have arbitrary relocations.
304 /// FIXME: This really should not be in VMCore.
305 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
306 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
307 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
308 return LocalRelocation; // Local to this file/library.
309 return GlobalRelocations; // Global reference.
312 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
313 return BA->getFunction()->getRelocationInfo();
315 // While raw uses of blockaddress need to be relocated, differences between
316 // two of them don't when they are for labels in the same function. This is a
317 // common idiom when creating a table for the indirect goto extension, so we
318 // handle it efficiently here.
319 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
320 if (CE->getOpcode() == Instruction::Sub) {
321 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
322 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
324 LHS->getOpcode() == Instruction::PtrToInt &&
325 RHS->getOpcode() == Instruction::PtrToInt &&
326 isa<BlockAddress>(LHS->getOperand(0)) &&
327 isa<BlockAddress>(RHS->getOperand(0)) &&
328 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
329 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
333 PossibleRelocationsTy Result = NoRelocation;
334 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
335 Result = std::max(Result,
336 cast<Constant>(getOperand(i))->getRelocationInfo());
341 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
342 /// it. This involves recursively eliminating any dead users of the
344 static bool removeDeadUsersOfConstant(const Constant *C) {
345 if (isa<GlobalValue>(C)) return false; // Cannot remove this
347 while (!C->use_empty()) {
348 const Constant *User = dyn_cast<Constant>(C->use_back());
349 if (!User) return false; // Non-constant usage;
350 if (!removeDeadUsersOfConstant(User))
351 return false; // Constant wasn't dead
354 const_cast<Constant*>(C)->destroyConstant();
359 /// removeDeadConstantUsers - If there are any dead constant users dangling
360 /// off of this constant, remove them. This method is useful for clients
361 /// that want to check to see if a global is unused, but don't want to deal
362 /// with potentially dead constants hanging off of the globals.
363 void Constant::removeDeadConstantUsers() const {
364 Value::const_use_iterator I = use_begin(), E = use_end();
365 Value::const_use_iterator LastNonDeadUser = E;
367 const Constant *User = dyn_cast<Constant>(*I);
374 if (!removeDeadUsersOfConstant(User)) {
375 // If the constant wasn't dead, remember that this was the last live use
376 // and move on to the next constant.
382 // If the constant was dead, then the iterator is invalidated.
383 if (LastNonDeadUser == E) {
395 //===----------------------------------------------------------------------===//
397 //===----------------------------------------------------------------------===//
399 void ConstantInt::anchor() { }
401 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
402 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
403 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
406 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
407 LLVMContextImpl *pImpl = Context.pImpl;
408 if (!pImpl->TheTrueVal)
409 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
410 return pImpl->TheTrueVal;
413 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
414 LLVMContextImpl *pImpl = Context.pImpl;
415 if (!pImpl->TheFalseVal)
416 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
417 return pImpl->TheFalseVal;
420 Constant *ConstantInt::getTrue(Type *Ty) {
421 VectorType *VTy = dyn_cast<VectorType>(Ty);
423 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
424 return ConstantInt::getTrue(Ty->getContext());
426 assert(VTy->getElementType()->isIntegerTy(1) &&
427 "True must be vector of i1 or i1.");
428 return ConstantVector::getSplat(VTy->getNumElements(),
429 ConstantInt::getTrue(Ty->getContext()));
432 Constant *ConstantInt::getFalse(Type *Ty) {
433 VectorType *VTy = dyn_cast<VectorType>(Ty);
435 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
436 return ConstantInt::getFalse(Ty->getContext());
438 assert(VTy->getElementType()->isIntegerTy(1) &&
439 "False must be vector of i1 or i1.");
440 return ConstantVector::getSplat(VTy->getNumElements(),
441 ConstantInt::getFalse(Ty->getContext()));
445 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
446 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
447 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
448 // compare APInt's of different widths, which would violate an APInt class
449 // invariant which generates an assertion.
450 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
451 // Get the corresponding integer type for the bit width of the value.
452 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
453 // get an existing value or the insertion position
454 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
455 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
456 if (!Slot) Slot = new ConstantInt(ITy, V);
460 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
461 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
463 // For vectors, broadcast the value.
464 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
465 return ConstantVector::getSplat(VTy->getNumElements(), C);
470 ConstantInt *ConstantInt::get(IntegerType *Ty, uint64_t V,
472 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
475 ConstantInt *ConstantInt::getSigned(IntegerType *Ty, int64_t V) {
476 return get(Ty, V, true);
479 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
480 return get(Ty, V, true);
483 Constant *ConstantInt::get(Type *Ty, const APInt& V) {
484 ConstantInt *C = get(Ty->getContext(), V);
485 assert(C->getType() == Ty->getScalarType() &&
486 "ConstantInt type doesn't match the type implied by its value!");
488 // For vectors, broadcast the value.
489 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
490 return ConstantVector::getSplat(VTy->getNumElements(), C);
495 ConstantInt *ConstantInt::get(IntegerType* Ty, StringRef Str,
497 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
500 //===----------------------------------------------------------------------===//
502 //===----------------------------------------------------------------------===//
504 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
506 return &APFloat::IEEEhalf;
508 return &APFloat::IEEEsingle;
509 if (Ty->isDoubleTy())
510 return &APFloat::IEEEdouble;
511 if (Ty->isX86_FP80Ty())
512 return &APFloat::x87DoubleExtended;
513 else if (Ty->isFP128Ty())
514 return &APFloat::IEEEquad;
516 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
517 return &APFloat::PPCDoubleDouble;
520 void ConstantFP::anchor() { }
522 /// get() - This returns a constant fp for the specified value in the
523 /// specified type. This should only be used for simple constant values like
524 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
525 Constant *ConstantFP::get(Type *Ty, double V) {
526 LLVMContext &Context = Ty->getContext();
530 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
531 APFloat::rmNearestTiesToEven, &ignored);
532 Constant *C = get(Context, FV);
534 // For vectors, broadcast the value.
535 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
536 return ConstantVector::getSplat(VTy->getNumElements(), C);
542 Constant *ConstantFP::get(Type *Ty, StringRef Str) {
543 LLVMContext &Context = Ty->getContext();
545 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
546 Constant *C = get(Context, FV);
548 // For vectors, broadcast the value.
549 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
550 return ConstantVector::getSplat(VTy->getNumElements(), C);
556 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
557 LLVMContext &Context = Ty->getContext();
558 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
560 return get(Context, apf);
564 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
565 Type *ScalarTy = Ty->getScalarType();
566 if (ScalarTy->isFloatingPointTy()) {
567 Constant *C = getNegativeZero(ScalarTy);
568 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
569 return ConstantVector::getSplat(VTy->getNumElements(), C);
573 return Constant::getNullValue(Ty);
577 // ConstantFP accessors.
578 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
579 DenseMapAPFloatKeyInfo::KeyTy Key(V);
581 LLVMContextImpl* pImpl = Context.pImpl;
583 ConstantFP *&Slot = pImpl->FPConstants[Key];
587 if (&V.getSemantics() == &APFloat::IEEEhalf)
588 Ty = Type::getHalfTy(Context);
589 else if (&V.getSemantics() == &APFloat::IEEEsingle)
590 Ty = Type::getFloatTy(Context);
591 else if (&V.getSemantics() == &APFloat::IEEEdouble)
592 Ty = Type::getDoubleTy(Context);
593 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
594 Ty = Type::getX86_FP80Ty(Context);
595 else if (&V.getSemantics() == &APFloat::IEEEquad)
596 Ty = Type::getFP128Ty(Context);
598 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
599 "Unknown FP format");
600 Ty = Type::getPPC_FP128Ty(Context);
602 Slot = new ConstantFP(Ty, V);
608 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
609 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
610 return ConstantFP::get(Ty->getContext(),
611 APFloat::getInf(Semantics, Negative));
614 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
615 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
616 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
620 bool ConstantFP::isExactlyValue(const APFloat &V) const {
621 return Val.bitwiseIsEqual(V);
624 //===----------------------------------------------------------------------===//
625 // ConstantAggregateZero Implementation
626 //===----------------------------------------------------------------------===//
628 /// getSequentialElement - If this CAZ has array or vector type, return a zero
629 /// with the right element type.
630 Constant *ConstantAggregateZero::getSequentialElement() const {
631 return Constant::getNullValue(getType()->getSequentialElementType());
634 /// getStructElement - If this CAZ has struct type, return a zero with the
635 /// right element type for the specified element.
636 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
637 return Constant::getNullValue(getType()->getStructElementType(Elt));
640 /// getElementValue - Return a zero of the right value for the specified GEP
641 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
642 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
643 if (isa<SequentialType>(getType()))
644 return getSequentialElement();
645 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
648 /// getElementValue - Return a zero of the right value for the specified GEP
650 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
651 if (isa<SequentialType>(getType()))
652 return getSequentialElement();
653 return getStructElement(Idx);
657 //===----------------------------------------------------------------------===//
658 // UndefValue Implementation
659 //===----------------------------------------------------------------------===//
661 /// getSequentialElement - If this undef has array or vector type, return an
662 /// undef with the right element type.
663 UndefValue *UndefValue::getSequentialElement() const {
664 return UndefValue::get(getType()->getSequentialElementType());
667 /// getStructElement - If this undef has struct type, return a zero with the
668 /// right element type for the specified element.
669 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
670 return UndefValue::get(getType()->getStructElementType(Elt));
673 /// getElementValue - Return an undef of the right value for the specified GEP
674 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
675 UndefValue *UndefValue::getElementValue(Constant *C) const {
676 if (isa<SequentialType>(getType()))
677 return getSequentialElement();
678 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
681 /// getElementValue - Return an undef of the right value for the specified GEP
683 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
684 if (isa<SequentialType>(getType()))
685 return getSequentialElement();
686 return getStructElement(Idx);
691 //===----------------------------------------------------------------------===//
692 // ConstantXXX Classes
693 //===----------------------------------------------------------------------===//
695 template <typename ItTy, typename EltTy>
696 static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
697 for (; Start != End; ++Start)
703 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
704 : Constant(T, ConstantArrayVal,
705 OperandTraits<ConstantArray>::op_end(this) - V.size(),
707 assert(V.size() == T->getNumElements() &&
708 "Invalid initializer vector for constant array");
709 for (unsigned i = 0, e = V.size(); i != e; ++i)
710 assert(V[i]->getType() == T->getElementType() &&
711 "Initializer for array element doesn't match array element type!");
712 std::copy(V.begin(), V.end(), op_begin());
715 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
716 // Empty arrays are canonicalized to ConstantAggregateZero.
718 return ConstantAggregateZero::get(Ty);
720 for (unsigned i = 0, e = V.size(); i != e; ++i) {
721 assert(V[i]->getType() == Ty->getElementType() &&
722 "Wrong type in array element initializer");
724 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
726 // If this is an all-zero array, return a ConstantAggregateZero object. If
727 // all undef, return an UndefValue, if "all simple", then return a
728 // ConstantDataArray.
730 if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
731 return UndefValue::get(Ty);
733 if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
734 return ConstantAggregateZero::get(Ty);
736 // Check to see if all of the elements are ConstantFP or ConstantInt and if
737 // the element type is compatible with ConstantDataVector. If so, use it.
738 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
739 // We speculatively build the elements here even if it turns out that there
740 // is a constantexpr or something else weird in the array, since it is so
741 // uncommon for that to happen.
742 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
743 if (CI->getType()->isIntegerTy(8)) {
744 SmallVector<uint8_t, 16> Elts;
745 for (unsigned i = 0, e = V.size(); i != e; ++i)
746 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
747 Elts.push_back(CI->getZExtValue());
750 if (Elts.size() == V.size())
751 return ConstantDataArray::get(C->getContext(), Elts);
752 } else if (CI->getType()->isIntegerTy(16)) {
753 SmallVector<uint16_t, 16> Elts;
754 for (unsigned i = 0, e = V.size(); i != e; ++i)
755 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
756 Elts.push_back(CI->getZExtValue());
759 if (Elts.size() == V.size())
760 return ConstantDataArray::get(C->getContext(), Elts);
761 } else if (CI->getType()->isIntegerTy(32)) {
762 SmallVector<uint32_t, 16> Elts;
763 for (unsigned i = 0, e = V.size(); i != e; ++i)
764 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
765 Elts.push_back(CI->getZExtValue());
768 if (Elts.size() == V.size())
769 return ConstantDataArray::get(C->getContext(), Elts);
770 } else if (CI->getType()->isIntegerTy(64)) {
771 SmallVector<uint64_t, 16> Elts;
772 for (unsigned i = 0, e = V.size(); i != e; ++i)
773 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
774 Elts.push_back(CI->getZExtValue());
777 if (Elts.size() == V.size())
778 return ConstantDataArray::get(C->getContext(), Elts);
782 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
783 if (CFP->getType()->isFloatTy()) {
784 SmallVector<float, 16> Elts;
785 for (unsigned i = 0, e = V.size(); i != e; ++i)
786 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
787 Elts.push_back(CFP->getValueAPF().convertToFloat());
790 if (Elts.size() == V.size())
791 return ConstantDataArray::get(C->getContext(), Elts);
792 } else if (CFP->getType()->isDoubleTy()) {
793 SmallVector<double, 16> Elts;
794 for (unsigned i = 0, e = V.size(); i != e; ++i)
795 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
796 Elts.push_back(CFP->getValueAPF().convertToDouble());
799 if (Elts.size() == V.size())
800 return ConstantDataArray::get(C->getContext(), Elts);
805 // Otherwise, we really do want to create a ConstantArray.
806 return pImpl->ArrayConstants.getOrCreate(Ty, V);
809 /// getTypeForElements - Return an anonymous struct type to use for a constant
810 /// with the specified set of elements. The list must not be empty.
811 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
812 ArrayRef<Constant*> V,
814 unsigned VecSize = V.size();
815 SmallVector<Type*, 16> EltTypes(VecSize);
816 for (unsigned i = 0; i != VecSize; ++i)
817 EltTypes[i] = V[i]->getType();
819 return StructType::get(Context, EltTypes, Packed);
823 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
826 "ConstantStruct::getTypeForElements cannot be called on empty list");
827 return getTypeForElements(V[0]->getContext(), V, Packed);
831 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
832 : Constant(T, ConstantStructVal,
833 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
835 assert(V.size() == T->getNumElements() &&
836 "Invalid initializer vector for constant structure");
837 for (unsigned i = 0, e = V.size(); i != e; ++i)
838 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
839 "Initializer for struct element doesn't match struct element type!");
840 std::copy(V.begin(), V.end(), op_begin());
843 // ConstantStruct accessors.
844 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
845 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
846 "Incorrect # elements specified to ConstantStruct::get");
848 // Create a ConstantAggregateZero value if all elements are zeros.
850 bool isUndef = false;
853 isUndef = isa<UndefValue>(V[0]);
854 isZero = V[0]->isNullValue();
855 if (isUndef || isZero) {
856 for (unsigned i = 0, e = V.size(); i != e; ++i) {
857 if (!V[i]->isNullValue())
859 if (!isa<UndefValue>(V[i]))
865 return ConstantAggregateZero::get(ST);
867 return UndefValue::get(ST);
869 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
872 Constant *ConstantStruct::get(StructType *T, ...) {
874 SmallVector<Constant*, 8> Values;
876 while (Constant *Val = va_arg(ap, llvm::Constant*))
877 Values.push_back(Val);
879 return get(T, Values);
882 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
883 : Constant(T, ConstantVectorVal,
884 OperandTraits<ConstantVector>::op_end(this) - V.size(),
886 for (size_t i = 0, e = V.size(); i != e; i++)
887 assert(V[i]->getType() == T->getElementType() &&
888 "Initializer for vector element doesn't match vector element type!");
889 std::copy(V.begin(), V.end(), op_begin());
892 // ConstantVector accessors.
893 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
894 assert(!V.empty() && "Vectors can't be empty");
895 VectorType *T = VectorType::get(V.front()->getType(), V.size());
896 LLVMContextImpl *pImpl = T->getContext().pImpl;
898 // If this is an all-undef or all-zero vector, return a
899 // ConstantAggregateZero or UndefValue.
901 bool isZero = C->isNullValue();
902 bool isUndef = isa<UndefValue>(C);
904 if (isZero || isUndef) {
905 for (unsigned i = 1, e = V.size(); i != e; ++i)
907 isZero = isUndef = false;
913 return ConstantAggregateZero::get(T);
915 return UndefValue::get(T);
917 // Check to see if all of the elements are ConstantFP or ConstantInt and if
918 // the element type is compatible with ConstantDataVector. If so, use it.
919 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
920 // We speculatively build the elements here even if it turns out that there
921 // is a constantexpr or something else weird in the array, since it is so
922 // uncommon for that to happen.
923 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
924 if (CI->getType()->isIntegerTy(8)) {
925 SmallVector<uint8_t, 16> Elts;
926 for (unsigned i = 0, e = V.size(); i != e; ++i)
927 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
928 Elts.push_back(CI->getZExtValue());
931 if (Elts.size() == V.size())
932 return ConstantDataVector::get(C->getContext(), Elts);
933 } else if (CI->getType()->isIntegerTy(16)) {
934 SmallVector<uint16_t, 16> Elts;
935 for (unsigned i = 0, e = V.size(); i != e; ++i)
936 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
937 Elts.push_back(CI->getZExtValue());
940 if (Elts.size() == V.size())
941 return ConstantDataVector::get(C->getContext(), Elts);
942 } else if (CI->getType()->isIntegerTy(32)) {
943 SmallVector<uint32_t, 16> Elts;
944 for (unsigned i = 0, e = V.size(); i != e; ++i)
945 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
946 Elts.push_back(CI->getZExtValue());
949 if (Elts.size() == V.size())
950 return ConstantDataVector::get(C->getContext(), Elts);
951 } else if (CI->getType()->isIntegerTy(64)) {
952 SmallVector<uint64_t, 16> Elts;
953 for (unsigned i = 0, e = V.size(); i != e; ++i)
954 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
955 Elts.push_back(CI->getZExtValue());
958 if (Elts.size() == V.size())
959 return ConstantDataVector::get(C->getContext(), Elts);
963 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
964 if (CFP->getType()->isFloatTy()) {
965 SmallVector<float, 16> Elts;
966 for (unsigned i = 0, e = V.size(); i != e; ++i)
967 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
968 Elts.push_back(CFP->getValueAPF().convertToFloat());
971 if (Elts.size() == V.size())
972 return ConstantDataVector::get(C->getContext(), Elts);
973 } else if (CFP->getType()->isDoubleTy()) {
974 SmallVector<double, 16> Elts;
975 for (unsigned i = 0, e = V.size(); i != e; ++i)
976 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
977 Elts.push_back(CFP->getValueAPF().convertToDouble());
980 if (Elts.size() == V.size())
981 return ConstantDataVector::get(C->getContext(), Elts);
986 // Otherwise, the element type isn't compatible with ConstantDataVector, or
987 // the operand list constants a ConstantExpr or something else strange.
988 return pImpl->VectorConstants.getOrCreate(T, V);
991 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
992 // If this splat is compatible with ConstantDataVector, use it instead of
994 if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
995 ConstantDataSequential::isElementTypeCompatible(V->getType()))
996 return ConstantDataVector::getSplat(NumElts, V);
998 SmallVector<Constant*, 32> Elts(NumElts, V);
1003 // Utility function for determining if a ConstantExpr is a CastOp or not. This
1004 // can't be inline because we don't want to #include Instruction.h into
1006 bool ConstantExpr::isCast() const {
1007 return Instruction::isCast(getOpcode());
1010 bool ConstantExpr::isCompare() const {
1011 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
1014 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
1015 if (getOpcode() != Instruction::GetElementPtr) return false;
1017 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
1018 User::const_op_iterator OI = llvm::next(this->op_begin());
1020 // Skip the first index, as it has no static limit.
1024 // The remaining indices must be compile-time known integers within the
1025 // bounds of the corresponding notional static array types.
1026 for (; GEPI != E; ++GEPI, ++OI) {
1027 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
1028 if (!CI) return false;
1029 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
1030 if (CI->getValue().getActiveBits() > 64 ||
1031 CI->getZExtValue() >= ATy->getNumElements())
1035 // All the indices checked out.
1039 bool ConstantExpr::hasIndices() const {
1040 return getOpcode() == Instruction::ExtractValue ||
1041 getOpcode() == Instruction::InsertValue;
1044 ArrayRef<unsigned> ConstantExpr::getIndices() const {
1045 if (const ExtractValueConstantExpr *EVCE =
1046 dyn_cast<ExtractValueConstantExpr>(this))
1047 return EVCE->Indices;
1049 return cast<InsertValueConstantExpr>(this)->Indices;
1052 unsigned ConstantExpr::getPredicate() const {
1053 assert(isCompare());
1054 return ((const CompareConstantExpr*)this)->predicate;
1057 /// getWithOperandReplaced - Return a constant expression identical to this
1058 /// one, but with the specified operand set to the specified value.
1060 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
1061 assert(Op->getType() == getOperand(OpNo)->getType() &&
1062 "Replacing operand with value of different type!");
1063 if (getOperand(OpNo) == Op)
1064 return const_cast<ConstantExpr*>(this);
1066 SmallVector<Constant*, 8> NewOps;
1067 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1068 NewOps.push_back(i == OpNo ? Op : getOperand(i));
1070 return getWithOperands(NewOps);
1073 /// getWithOperands - This returns the current constant expression with the
1074 /// operands replaced with the specified values. The specified array must
1075 /// have the same number of operands as our current one.
1076 Constant *ConstantExpr::
1077 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
1078 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
1079 bool AnyChange = Ty != getType();
1080 for (unsigned i = 0; i != Ops.size(); ++i)
1081 AnyChange |= Ops[i] != getOperand(i);
1083 if (!AnyChange) // No operands changed, return self.
1084 return const_cast<ConstantExpr*>(this);
1086 switch (getOpcode()) {
1087 case Instruction::Trunc:
1088 case Instruction::ZExt:
1089 case Instruction::SExt:
1090 case Instruction::FPTrunc:
1091 case Instruction::FPExt:
1092 case Instruction::UIToFP:
1093 case Instruction::SIToFP:
1094 case Instruction::FPToUI:
1095 case Instruction::FPToSI:
1096 case Instruction::PtrToInt:
1097 case Instruction::IntToPtr:
1098 case Instruction::BitCast:
1099 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
1100 case Instruction::Select:
1101 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
1102 case Instruction::InsertElement:
1103 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1104 case Instruction::ExtractElement:
1105 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1106 case Instruction::InsertValue:
1107 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices());
1108 case Instruction::ExtractValue:
1109 return ConstantExpr::getExtractValue(Ops[0], getIndices());
1110 case Instruction::ShuffleVector:
1111 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1112 case Instruction::GetElementPtr:
1113 return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1114 cast<GEPOperator>(this)->isInBounds());
1115 case Instruction::ICmp:
1116 case Instruction::FCmp:
1117 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1119 assert(getNumOperands() == 2 && "Must be binary operator?");
1120 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1125 //===----------------------------------------------------------------------===//
1126 // isValueValidForType implementations
1128 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1129 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1130 if (Ty->isIntegerTy(1))
1131 return Val == 0 || Val == 1;
1133 return true; // always true, has to fit in largest type
1134 uint64_t Max = (1ll << NumBits) - 1;
1138 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1139 unsigned NumBits = Ty->getIntegerBitWidth();
1140 if (Ty->isIntegerTy(1))
1141 return Val == 0 || Val == 1 || Val == -1;
1143 return true; // always true, has to fit in largest type
1144 int64_t Min = -(1ll << (NumBits-1));
1145 int64_t Max = (1ll << (NumBits-1)) - 1;
1146 return (Val >= Min && Val <= Max);
1149 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1150 // convert modifies in place, so make a copy.
1151 APFloat Val2 = APFloat(Val);
1153 switch (Ty->getTypeID()) {
1155 return false; // These can't be represented as floating point!
1157 // FIXME rounding mode needs to be more flexible
1158 case Type::HalfTyID: {
1159 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1161 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1164 case Type::FloatTyID: {
1165 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1167 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1170 case Type::DoubleTyID: {
1171 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1172 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1173 &Val2.getSemantics() == &APFloat::IEEEdouble)
1175 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1178 case Type::X86_FP80TyID:
1179 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1180 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1181 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1182 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1183 case Type::FP128TyID:
1184 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1185 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1186 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1187 &Val2.getSemantics() == &APFloat::IEEEquad;
1188 case Type::PPC_FP128TyID:
1189 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1190 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1191 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1192 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1197 //===----------------------------------------------------------------------===//
1198 // Factory Function Implementation
1200 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1201 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1202 "Cannot create an aggregate zero of non-aggregate type!");
1204 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1206 Entry = new ConstantAggregateZero(Ty);
1211 /// destroyConstant - Remove the constant from the constant table.
1213 void ConstantAggregateZero::destroyConstant() {
1214 getContext().pImpl->CAZConstants.erase(getType());
1215 destroyConstantImpl();
1218 /// destroyConstant - Remove the constant from the constant table...
1220 void ConstantArray::destroyConstant() {
1221 getType()->getContext().pImpl->ArrayConstants.remove(this);
1222 destroyConstantImpl();
1226 //---- ConstantStruct::get() implementation...
1229 // destroyConstant - Remove the constant from the constant table...
1231 void ConstantStruct::destroyConstant() {
1232 getType()->getContext().pImpl->StructConstants.remove(this);
1233 destroyConstantImpl();
1236 // destroyConstant - Remove the constant from the constant table...
1238 void ConstantVector::destroyConstant() {
1239 getType()->getContext().pImpl->VectorConstants.remove(this);
1240 destroyConstantImpl();
1243 /// getSplatValue - If this is a splat constant, where all of the
1244 /// elements have the same value, return that value. Otherwise return null.
1245 Constant *ConstantVector::getSplatValue() const {
1246 // Check out first element.
1247 Constant *Elt = getOperand(0);
1248 // Then make sure all remaining elements point to the same value.
1249 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1250 if (getOperand(I) != Elt)
1255 //---- ConstantPointerNull::get() implementation.
1258 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1259 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1261 Entry = new ConstantPointerNull(Ty);
1266 // destroyConstant - Remove the constant from the constant table...
1268 void ConstantPointerNull::destroyConstant() {
1269 getContext().pImpl->CPNConstants.erase(getType());
1270 // Free the constant and any dangling references to it.
1271 destroyConstantImpl();
1275 //---- UndefValue::get() implementation.
1278 UndefValue *UndefValue::get(Type *Ty) {
1279 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1281 Entry = new UndefValue(Ty);
1286 // destroyConstant - Remove the constant from the constant table.
1288 void UndefValue::destroyConstant() {
1289 // Free the constant and any dangling references to it.
1290 getContext().pImpl->UVConstants.erase(getType());
1291 destroyConstantImpl();
1294 //---- BlockAddress::get() implementation.
1297 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1298 assert(BB->getParent() != 0 && "Block must have a parent");
1299 return get(BB->getParent(), BB);
1302 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1304 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1306 BA = new BlockAddress(F, BB);
1308 assert(BA->getFunction() == F && "Basic block moved between functions");
1312 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1313 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1317 BB->AdjustBlockAddressRefCount(1);
1321 // destroyConstant - Remove the constant from the constant table.
1323 void BlockAddress::destroyConstant() {
1324 getFunction()->getType()->getContext().pImpl
1325 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1326 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1327 destroyConstantImpl();
1330 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1331 // This could be replacing either the Basic Block or the Function. In either
1332 // case, we have to remove the map entry.
1333 Function *NewF = getFunction();
1334 BasicBlock *NewBB = getBasicBlock();
1337 NewF = cast<Function>(To);
1339 NewBB = cast<BasicBlock>(To);
1341 // See if the 'new' entry already exists, if not, just update this in place
1342 // and return early.
1343 BlockAddress *&NewBA =
1344 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1346 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1348 // Remove the old entry, this can't cause the map to rehash (just a
1349 // tombstone will get added).
1350 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1353 setOperand(0, NewF);
1354 setOperand(1, NewBB);
1355 getBasicBlock()->AdjustBlockAddressRefCount(1);
1359 // Otherwise, I do need to replace this with an existing value.
1360 assert(NewBA != this && "I didn't contain From!");
1362 // Everyone using this now uses the replacement.
1363 replaceAllUsesWith(NewBA);
1368 //---- ConstantExpr::get() implementations.
1371 /// This is a utility function to handle folding of casts and lookup of the
1372 /// cast in the ExprConstants map. It is used by the various get* methods below.
1373 static inline Constant *getFoldedCast(
1374 Instruction::CastOps opc, Constant *C, Type *Ty) {
1375 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1376 // Fold a few common cases
1377 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1380 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1382 // Look up the constant in the table first to ensure uniqueness
1383 std::vector<Constant*> argVec(1, C);
1384 ExprMapKeyType Key(opc, argVec);
1386 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1389 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1390 Instruction::CastOps opc = Instruction::CastOps(oc);
1391 assert(Instruction::isCast(opc) && "opcode out of range");
1392 assert(C && Ty && "Null arguments to getCast");
1393 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1397 llvm_unreachable("Invalid cast opcode");
1398 case Instruction::Trunc: return getTrunc(C, Ty);
1399 case Instruction::ZExt: return getZExt(C, Ty);
1400 case Instruction::SExt: return getSExt(C, Ty);
1401 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1402 case Instruction::FPExt: return getFPExtend(C, Ty);
1403 case Instruction::UIToFP: return getUIToFP(C, Ty);
1404 case Instruction::SIToFP: return getSIToFP(C, Ty);
1405 case Instruction::FPToUI: return getFPToUI(C, Ty);
1406 case Instruction::FPToSI: return getFPToSI(C, Ty);
1407 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1408 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1409 case Instruction::BitCast: return getBitCast(C, Ty);
1413 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1414 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1415 return getBitCast(C, Ty);
1416 return getZExt(C, Ty);
1419 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1420 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1421 return getBitCast(C, Ty);
1422 return getSExt(C, Ty);
1425 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1426 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1427 return getBitCast(C, Ty);
1428 return getTrunc(C, Ty);
1431 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1432 assert(S->getType()->isPointerTy() && "Invalid cast");
1433 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1435 if (Ty->isIntegerTy())
1436 return getPtrToInt(S, Ty);
1437 return getBitCast(S, Ty);
1440 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1442 assert(C->getType()->isIntOrIntVectorTy() &&
1443 Ty->isIntOrIntVectorTy() && "Invalid cast");
1444 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1445 unsigned DstBits = Ty->getScalarSizeInBits();
1446 Instruction::CastOps opcode =
1447 (SrcBits == DstBits ? Instruction::BitCast :
1448 (SrcBits > DstBits ? Instruction::Trunc :
1449 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1450 return getCast(opcode, C, Ty);
1453 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1454 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1456 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1457 unsigned DstBits = Ty->getScalarSizeInBits();
1458 if (SrcBits == DstBits)
1459 return C; // Avoid a useless cast
1460 Instruction::CastOps opcode =
1461 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1462 return getCast(opcode, C, Ty);
1465 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1467 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1468 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1470 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1471 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1472 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1473 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1474 "SrcTy must be larger than DestTy for Trunc!");
1476 return getFoldedCast(Instruction::Trunc, C, Ty);
1479 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1481 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1482 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1484 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1485 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1486 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1487 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1488 "SrcTy must be smaller than DestTy for SExt!");
1490 return getFoldedCast(Instruction::SExt, C, Ty);
1493 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1495 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1496 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1498 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1499 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1500 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1501 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1502 "SrcTy must be smaller than DestTy for ZExt!");
1504 return getFoldedCast(Instruction::ZExt, C, Ty);
1507 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1509 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1510 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1512 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1513 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1514 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1515 "This is an illegal floating point truncation!");
1516 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1519 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1521 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1522 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1524 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1525 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1526 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1527 "This is an illegal floating point extension!");
1528 return getFoldedCast(Instruction::FPExt, C, Ty);
1531 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1533 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1534 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1536 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1537 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1538 "This is an illegal uint to floating point cast!");
1539 return getFoldedCast(Instruction::UIToFP, C, Ty);
1542 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1544 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1545 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1547 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1548 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1549 "This is an illegal sint to floating point cast!");
1550 return getFoldedCast(Instruction::SIToFP, C, Ty);
1553 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1555 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1556 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1558 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1559 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1560 "This is an illegal floating point to uint cast!");
1561 return getFoldedCast(Instruction::FPToUI, C, Ty);
1564 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1566 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1567 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1569 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1570 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1571 "This is an illegal floating point to sint cast!");
1572 return getFoldedCast(Instruction::FPToSI, C, Ty);
1575 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1576 assert(C->getType()->getScalarType()->isPointerTy() &&
1577 "PtrToInt source must be pointer or pointer vector");
1578 assert(DstTy->getScalarType()->isIntegerTy() &&
1579 "PtrToInt destination must be integer or integer vector");
1580 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1581 if (isa<VectorType>(C->getType()))
1582 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1583 "Invalid cast between a different number of vector elements");
1584 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1587 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1588 assert(C->getType()->getScalarType()->isIntegerTy() &&
1589 "IntToPtr source must be integer or integer vector");
1590 assert(DstTy->getScalarType()->isPointerTy() &&
1591 "IntToPtr destination must be a pointer or pointer vector");
1592 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1593 if (isa<VectorType>(C->getType()))
1594 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1595 "Invalid cast between a different number of vector elements");
1596 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1599 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1600 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1601 "Invalid constantexpr bitcast!");
1603 // It is common to ask for a bitcast of a value to its own type, handle this
1605 if (C->getType() == DstTy) return C;
1607 return getFoldedCast(Instruction::BitCast, C, DstTy);
1610 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1612 // Check the operands for consistency first.
1613 assert(Opcode >= Instruction::BinaryOpsBegin &&
1614 Opcode < Instruction::BinaryOpsEnd &&
1615 "Invalid opcode in binary constant expression");
1616 assert(C1->getType() == C2->getType() &&
1617 "Operand types in binary constant expression should match");
1621 case Instruction::Add:
1622 case Instruction::Sub:
1623 case Instruction::Mul:
1624 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1625 assert(C1->getType()->isIntOrIntVectorTy() &&
1626 "Tried to create an integer operation on a non-integer type!");
1628 case Instruction::FAdd:
1629 case Instruction::FSub:
1630 case Instruction::FMul:
1631 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1632 assert(C1->getType()->isFPOrFPVectorTy() &&
1633 "Tried to create a floating-point operation on a "
1634 "non-floating-point type!");
1636 case Instruction::UDiv:
1637 case Instruction::SDiv:
1638 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1639 assert(C1->getType()->isIntOrIntVectorTy() &&
1640 "Tried to create an arithmetic operation on a non-arithmetic type!");
1642 case Instruction::FDiv:
1643 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1644 assert(C1->getType()->isFPOrFPVectorTy() &&
1645 "Tried to create an arithmetic operation on a non-arithmetic type!");
1647 case Instruction::URem:
1648 case Instruction::SRem:
1649 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1650 assert(C1->getType()->isIntOrIntVectorTy() &&
1651 "Tried to create an arithmetic operation on a non-arithmetic type!");
1653 case Instruction::FRem:
1654 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1655 assert(C1->getType()->isFPOrFPVectorTy() &&
1656 "Tried to create an arithmetic operation on a non-arithmetic type!");
1658 case Instruction::And:
1659 case Instruction::Or:
1660 case Instruction::Xor:
1661 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1662 assert(C1->getType()->isIntOrIntVectorTy() &&
1663 "Tried to create a logical operation on a non-integral type!");
1665 case Instruction::Shl:
1666 case Instruction::LShr:
1667 case Instruction::AShr:
1668 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1669 assert(C1->getType()->isIntOrIntVectorTy() &&
1670 "Tried to create a shift operation on a non-integer type!");
1677 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1678 return FC; // Fold a few common cases.
1680 std::vector<Constant*> argVec(1, C1);
1681 argVec.push_back(C2);
1682 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1684 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1685 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1688 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1689 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1690 // Note that a non-inbounds gep is used, as null isn't within any object.
1691 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1692 Constant *GEP = getGetElementPtr(
1693 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1694 return getPtrToInt(GEP,
1695 Type::getInt64Ty(Ty->getContext()));
1698 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1699 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1700 // Note that a non-inbounds gep is used, as null isn't within any object.
1702 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1703 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1704 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1705 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1706 Constant *Indices[2] = { Zero, One };
1707 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1708 return getPtrToInt(GEP,
1709 Type::getInt64Ty(Ty->getContext()));
1712 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1713 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1717 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1718 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1719 // Note that a non-inbounds gep is used, as null isn't within any object.
1720 Constant *GEPIdx[] = {
1721 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1724 Constant *GEP = getGetElementPtr(
1725 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1726 return getPtrToInt(GEP,
1727 Type::getInt64Ty(Ty->getContext()));
1730 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1731 Constant *C1, Constant *C2) {
1732 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1734 switch (Predicate) {
1735 default: llvm_unreachable("Invalid CmpInst predicate");
1736 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1737 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1738 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1739 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1740 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1741 case CmpInst::FCMP_TRUE:
1742 return getFCmp(Predicate, C1, C2);
1744 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1745 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1746 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1747 case CmpInst::ICMP_SLE:
1748 return getICmp(Predicate, C1, C2);
1752 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1753 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1755 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1756 return SC; // Fold common cases
1758 std::vector<Constant*> argVec(3, C);
1761 ExprMapKeyType Key(Instruction::Select, argVec);
1763 LLVMContextImpl *pImpl = C->getContext().pImpl;
1764 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1767 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1769 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1770 return FC; // Fold a few common cases.
1772 // Get the result type of the getelementptr!
1773 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1774 assert(Ty && "GEP indices invalid!");
1775 unsigned AS = C->getType()->getPointerAddressSpace();
1776 Type *ReqTy = Ty->getPointerTo(AS);
1778 assert(C->getType()->isPointerTy() &&
1779 "Non-pointer type for constant GetElementPtr expression");
1780 // Look up the constant in the table first to ensure uniqueness
1781 std::vector<Constant*> ArgVec;
1782 ArgVec.reserve(1 + Idxs.size());
1783 ArgVec.push_back(C);
1784 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1785 ArgVec.push_back(cast<Constant>(Idxs[i]));
1786 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1787 InBounds ? GEPOperator::IsInBounds : 0);
1789 LLVMContextImpl *pImpl = C->getContext().pImpl;
1790 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1794 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1795 assert(LHS->getType() == RHS->getType());
1796 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1797 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1799 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1800 return FC; // Fold a few common cases...
1802 // Look up the constant in the table first to ensure uniqueness
1803 std::vector<Constant*> ArgVec;
1804 ArgVec.push_back(LHS);
1805 ArgVec.push_back(RHS);
1806 // Get the key type with both the opcode and predicate
1807 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1809 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1810 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1811 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1813 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1814 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1818 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1819 assert(LHS->getType() == RHS->getType());
1820 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1822 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1823 return FC; // Fold a few common cases...
1825 // Look up the constant in the table first to ensure uniqueness
1826 std::vector<Constant*> ArgVec;
1827 ArgVec.push_back(LHS);
1828 ArgVec.push_back(RHS);
1829 // Get the key type with both the opcode and predicate
1830 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1832 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1833 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1834 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1836 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1837 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1840 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1841 assert(Val->getType()->isVectorTy() &&
1842 "Tried to create extractelement operation on non-vector type!");
1843 assert(Idx->getType()->isIntegerTy(32) &&
1844 "Extractelement index must be i32 type!");
1846 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1847 return FC; // Fold a few common cases.
1849 // Look up the constant in the table first to ensure uniqueness
1850 std::vector<Constant*> ArgVec(1, Val);
1851 ArgVec.push_back(Idx);
1852 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1854 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1855 Type *ReqTy = Val->getType()->getVectorElementType();
1856 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1859 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1861 assert(Val->getType()->isVectorTy() &&
1862 "Tried to create insertelement operation on non-vector type!");
1863 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1864 "Insertelement types must match!");
1865 assert(Idx->getType()->isIntegerTy(32) &&
1866 "Insertelement index must be i32 type!");
1868 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1869 return FC; // Fold a few common cases.
1870 // Look up the constant in the table first to ensure uniqueness
1871 std::vector<Constant*> ArgVec(1, Val);
1872 ArgVec.push_back(Elt);
1873 ArgVec.push_back(Idx);
1874 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1876 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1877 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1880 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1882 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1883 "Invalid shuffle vector constant expr operands!");
1885 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1886 return FC; // Fold a few common cases.
1888 unsigned NElts = Mask->getType()->getVectorNumElements();
1889 Type *EltTy = V1->getType()->getVectorElementType();
1890 Type *ShufTy = VectorType::get(EltTy, NElts);
1892 // Look up the constant in the table first to ensure uniqueness
1893 std::vector<Constant*> ArgVec(1, V1);
1894 ArgVec.push_back(V2);
1895 ArgVec.push_back(Mask);
1896 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1898 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1899 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1902 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1903 ArrayRef<unsigned> Idxs) {
1904 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1905 Idxs) == Val->getType() &&
1906 "insertvalue indices invalid!");
1907 assert(Agg->getType()->isFirstClassType() &&
1908 "Non-first-class type for constant insertvalue expression");
1909 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1910 assert(FC && "insertvalue constant expr couldn't be folded!");
1914 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1915 ArrayRef<unsigned> Idxs) {
1916 assert(Agg->getType()->isFirstClassType() &&
1917 "Tried to create extractelement operation on non-first-class type!");
1919 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1921 assert(ReqTy && "extractvalue indices invalid!");
1923 assert(Agg->getType()->isFirstClassType() &&
1924 "Non-first-class type for constant extractvalue expression");
1925 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1926 assert(FC && "ExtractValue constant expr couldn't be folded!");
1930 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1931 assert(C->getType()->isIntOrIntVectorTy() &&
1932 "Cannot NEG a nonintegral value!");
1933 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1937 Constant *ConstantExpr::getFNeg(Constant *C) {
1938 assert(C->getType()->isFPOrFPVectorTy() &&
1939 "Cannot FNEG a non-floating-point value!");
1940 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1943 Constant *ConstantExpr::getNot(Constant *C) {
1944 assert(C->getType()->isIntOrIntVectorTy() &&
1945 "Cannot NOT a nonintegral value!");
1946 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1949 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1950 bool HasNUW, bool HasNSW) {
1951 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1952 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1953 return get(Instruction::Add, C1, C2, Flags);
1956 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1957 return get(Instruction::FAdd, C1, C2);
1960 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1961 bool HasNUW, bool HasNSW) {
1962 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1963 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1964 return get(Instruction::Sub, C1, C2, Flags);
1967 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1968 return get(Instruction::FSub, C1, C2);
1971 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1972 bool HasNUW, bool HasNSW) {
1973 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1974 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1975 return get(Instruction::Mul, C1, C2, Flags);
1978 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1979 return get(Instruction::FMul, C1, C2);
1982 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1983 return get(Instruction::UDiv, C1, C2,
1984 isExact ? PossiblyExactOperator::IsExact : 0);
1987 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1988 return get(Instruction::SDiv, C1, C2,
1989 isExact ? PossiblyExactOperator::IsExact : 0);
1992 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1993 return get(Instruction::FDiv, C1, C2);
1996 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1997 return get(Instruction::URem, C1, C2);
2000 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
2001 return get(Instruction::SRem, C1, C2);
2004 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
2005 return get(Instruction::FRem, C1, C2);
2008 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
2009 return get(Instruction::And, C1, C2);
2012 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
2013 return get(Instruction::Or, C1, C2);
2016 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
2017 return get(Instruction::Xor, C1, C2);
2020 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
2021 bool HasNUW, bool HasNSW) {
2022 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2023 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2024 return get(Instruction::Shl, C1, C2, Flags);
2027 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2028 return get(Instruction::LShr, C1, C2,
2029 isExact ? PossiblyExactOperator::IsExact : 0);
2032 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2033 return get(Instruction::AShr, C1, C2,
2034 isExact ? PossiblyExactOperator::IsExact : 0);
2037 /// getBinOpIdentity - Return the identity for the given binary operation,
2038 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2039 /// returns null if the operator doesn't have an identity.
2040 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2043 // Doesn't have an identity.
2046 case Instruction::Add:
2047 case Instruction::Or:
2048 case Instruction::Xor:
2049 return Constant::getNullValue(Ty);
2051 case Instruction::Mul:
2052 return ConstantInt::get(Ty, 1);
2054 case Instruction::And:
2055 return Constant::getAllOnesValue(Ty);
2059 /// getBinOpAbsorber - Return the absorbing element for the given binary
2060 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2061 /// every X. For example, this returns zero for integer multiplication.
2062 /// It returns null if the operator doesn't have an absorbing element.
2063 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2066 // Doesn't have an absorber.
2069 case Instruction::Or:
2070 return Constant::getAllOnesValue(Ty);
2072 case Instruction::And:
2073 case Instruction::Mul:
2074 return Constant::getNullValue(Ty);
2078 // destroyConstant - Remove the constant from the constant table...
2080 void ConstantExpr::destroyConstant() {
2081 getType()->getContext().pImpl->ExprConstants.remove(this);
2082 destroyConstantImpl();
2085 const char *ConstantExpr::getOpcodeName() const {
2086 return Instruction::getOpcodeName(getOpcode());
2091 GetElementPtrConstantExpr::
2092 GetElementPtrConstantExpr(Constant *C, ArrayRef<Constant*> IdxList,
2094 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2095 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2096 - (IdxList.size()+1), IdxList.size()+1) {
2098 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2099 OperandList[i+1] = IdxList[i];
2102 //===----------------------------------------------------------------------===//
2103 // ConstantData* implementations
2105 void ConstantDataArray::anchor() {}
2106 void ConstantDataVector::anchor() {}
2108 /// getElementType - Return the element type of the array/vector.
2109 Type *ConstantDataSequential::getElementType() const {
2110 return getType()->getElementType();
2113 StringRef ConstantDataSequential::getRawDataValues() const {
2114 return StringRef(DataElements, getNumElements()*getElementByteSize());
2117 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2118 /// formed with a vector or array of the specified element type.
2119 /// ConstantDataArray only works with normal float and int types that are
2120 /// stored densely in memory, not with things like i42 or x86_f80.
2121 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2122 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2123 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2124 switch (IT->getBitWidth()) {
2136 /// getNumElements - Return the number of elements in the array or vector.
2137 unsigned ConstantDataSequential::getNumElements() const {
2138 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2139 return AT->getNumElements();
2140 return getType()->getVectorNumElements();
2144 /// getElementByteSize - Return the size in bytes of the elements in the data.
2145 uint64_t ConstantDataSequential::getElementByteSize() const {
2146 return getElementType()->getPrimitiveSizeInBits()/8;
2149 /// getElementPointer - Return the start of the specified element.
2150 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2151 assert(Elt < getNumElements() && "Invalid Elt");
2152 return DataElements+Elt*getElementByteSize();
2156 /// isAllZeros - return true if the array is empty or all zeros.
2157 static bool isAllZeros(StringRef Arr) {
2158 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2164 /// getImpl - This is the underlying implementation of all of the
2165 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2166 /// the correct element type. We take the bytes in as a StringRef because
2167 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2168 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2169 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2170 // If the elements are all zero or there are no elements, return a CAZ, which
2171 // is more dense and canonical.
2172 if (isAllZeros(Elements))
2173 return ConstantAggregateZero::get(Ty);
2175 // Do a lookup to see if we have already formed one of these.
2176 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2177 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2179 // The bucket can point to a linked list of different CDS's that have the same
2180 // body but different types. For example, 0,0,0,1 could be a 4 element array
2181 // of i8, or a 1-element array of i32. They'll both end up in the same
2182 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2183 ConstantDataSequential **Entry = &Slot.getValue();
2184 for (ConstantDataSequential *Node = *Entry; Node != 0;
2185 Entry = &Node->Next, Node = *Entry)
2186 if (Node->getType() == Ty)
2189 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2191 if (isa<ArrayType>(Ty))
2192 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2194 assert(isa<VectorType>(Ty));
2195 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2198 void ConstantDataSequential::destroyConstant() {
2199 // Remove the constant from the StringMap.
2200 StringMap<ConstantDataSequential*> &CDSConstants =
2201 getType()->getContext().pImpl->CDSConstants;
2203 StringMap<ConstantDataSequential*>::iterator Slot =
2204 CDSConstants.find(getRawDataValues());
2206 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2208 ConstantDataSequential **Entry = &Slot->getValue();
2210 // Remove the entry from the hash table.
2211 if ((*Entry)->Next == 0) {
2212 // If there is only one value in the bucket (common case) it must be this
2213 // entry, and removing the entry should remove the bucket completely.
2214 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2215 getContext().pImpl->CDSConstants.erase(Slot);
2217 // Otherwise, there are multiple entries linked off the bucket, unlink the
2218 // node we care about but keep the bucket around.
2219 for (ConstantDataSequential *Node = *Entry; ;
2220 Entry = &Node->Next, Node = *Entry) {
2221 assert(Node && "Didn't find entry in its uniquing hash table!");
2222 // If we found our entry, unlink it from the list and we're done.
2224 *Entry = Node->Next;
2230 // If we were part of a list, make sure that we don't delete the list that is
2231 // still owned by the uniquing map.
2234 // Finally, actually delete it.
2235 destroyConstantImpl();
2238 /// get() constructors - Return a constant with array type with an element
2239 /// count and element type matching the ArrayRef passed in. Note that this
2240 /// can return a ConstantAggregateZero object.
2241 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2242 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2243 const char *Data = reinterpret_cast<const char *>(Elts.data());
2244 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2246 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2247 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2248 const char *Data = reinterpret_cast<const char *>(Elts.data());
2249 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2251 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2252 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2253 const char *Data = reinterpret_cast<const char *>(Elts.data());
2254 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2256 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2257 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2258 const char *Data = reinterpret_cast<const char *>(Elts.data());
2259 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2261 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2262 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2263 const char *Data = reinterpret_cast<const char *>(Elts.data());
2264 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2266 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2267 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2268 const char *Data = reinterpret_cast<const char *>(Elts.data());
2269 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2272 /// getString - This method constructs a CDS and initializes it with a text
2273 /// string. The default behavior (AddNull==true) causes a null terminator to
2274 /// be placed at the end of the array (increasing the length of the string by
2275 /// one more than the StringRef would normally indicate. Pass AddNull=false
2276 /// to disable this behavior.
2277 Constant *ConstantDataArray::getString(LLVMContext &Context,
2278 StringRef Str, bool AddNull) {
2280 const uint8_t *Data = reinterpret_cast<const uint8_t *>(Str.data());
2281 return get(Context, ArrayRef<uint8_t>(const_cast<uint8_t *>(Data),
2285 SmallVector<uint8_t, 64> ElementVals;
2286 ElementVals.append(Str.begin(), Str.end());
2287 ElementVals.push_back(0);
2288 return get(Context, ElementVals);
2291 /// get() constructors - Return a constant with vector type with an element
2292 /// count and element type matching the ArrayRef passed in. Note that this
2293 /// can return a ConstantAggregateZero object.
2294 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2295 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2296 const char *Data = reinterpret_cast<const char *>(Elts.data());
2297 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2299 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2300 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2301 const char *Data = reinterpret_cast<const char *>(Elts.data());
2302 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2304 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2305 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2306 const char *Data = reinterpret_cast<const char *>(Elts.data());
2307 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2309 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2310 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2311 const char *Data = reinterpret_cast<const char *>(Elts.data());
2312 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2314 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2315 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2316 const char *Data = reinterpret_cast<const char *>(Elts.data());
2317 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2319 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2320 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2321 const char *Data = reinterpret_cast<const char *>(Elts.data());
2322 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2325 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2326 assert(isElementTypeCompatible(V->getType()) &&
2327 "Element type not compatible with ConstantData");
2328 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2329 if (CI->getType()->isIntegerTy(8)) {
2330 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2331 return get(V->getContext(), Elts);
2333 if (CI->getType()->isIntegerTy(16)) {
2334 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2335 return get(V->getContext(), Elts);
2337 if (CI->getType()->isIntegerTy(32)) {
2338 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2339 return get(V->getContext(), Elts);
2341 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2342 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2343 return get(V->getContext(), Elts);
2346 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2347 if (CFP->getType()->isFloatTy()) {
2348 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2349 return get(V->getContext(), Elts);
2351 if (CFP->getType()->isDoubleTy()) {
2352 SmallVector<double, 16> Elts(NumElts,
2353 CFP->getValueAPF().convertToDouble());
2354 return get(V->getContext(), Elts);
2357 return ConstantVector::getSplat(NumElts, V);
2361 /// getElementAsInteger - If this is a sequential container of integers (of
2362 /// any size), return the specified element in the low bits of a uint64_t.
2363 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2364 assert(isa<IntegerType>(getElementType()) &&
2365 "Accessor can only be used when element is an integer");
2366 const char *EltPtr = getElementPointer(Elt);
2368 // The data is stored in host byte order, make sure to cast back to the right
2369 // type to load with the right endianness.
2370 switch (getElementType()->getIntegerBitWidth()) {
2371 default: llvm_unreachable("Invalid bitwidth for CDS");
2373 return *const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(EltPtr));
2375 return *const_cast<uint16_t *>(reinterpret_cast<const uint16_t *>(EltPtr));
2377 return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(EltPtr));
2379 return *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(EltPtr));
2383 /// getElementAsAPFloat - If this is a sequential container of floating point
2384 /// type, return the specified element as an APFloat.
2385 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2386 const char *EltPtr = getElementPointer(Elt);
2388 switch (getElementType()->getTypeID()) {
2390 llvm_unreachable("Accessor can only be used when element is float/double!");
2391 case Type::FloatTyID: {
2392 const float *FloatPrt = reinterpret_cast<const float *>(EltPtr);
2393 return APFloat(*const_cast<float *>(FloatPrt));
2395 case Type::DoubleTyID: {
2396 const double *DoublePtr = reinterpret_cast<const double *>(EltPtr);
2397 return APFloat(*const_cast<double *>(DoublePtr));
2402 /// getElementAsFloat - If this is an sequential container of floats, return
2403 /// the specified element as a float.
2404 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2405 assert(getElementType()->isFloatTy() &&
2406 "Accessor can only be used when element is a 'float'");
2407 const float *EltPtr = reinterpret_cast<const float *>(getElementPointer(Elt));
2408 return *const_cast<float *>(EltPtr);
2411 /// getElementAsDouble - If this is an sequential container of doubles, return
2412 /// the specified element as a float.
2413 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2414 assert(getElementType()->isDoubleTy() &&
2415 "Accessor can only be used when element is a 'float'");
2416 const double *EltPtr =
2417 reinterpret_cast<const double *>(getElementPointer(Elt));
2418 return *const_cast<double *>(EltPtr);
2421 /// getElementAsConstant - Return a Constant for a specified index's element.
2422 /// Note that this has to compute a new constant to return, so it isn't as
2423 /// efficient as getElementAsInteger/Float/Double.
2424 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2425 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2426 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2428 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2431 /// isString - This method returns true if this is an array of i8.
2432 bool ConstantDataSequential::isString() const {
2433 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2436 /// isCString - This method returns true if the array "isString", ends with a
2437 /// nul byte, and does not contains any other nul bytes.
2438 bool ConstantDataSequential::isCString() const {
2442 StringRef Str = getAsString();
2444 // The last value must be nul.
2445 if (Str.back() != 0) return false;
2447 // Other elements must be non-nul.
2448 return Str.drop_back().find(0) == StringRef::npos;
2451 /// getSplatValue - If this is a splat constant, meaning that all of the
2452 /// elements have the same value, return that value. Otherwise return NULL.
2453 Constant *ConstantDataVector::getSplatValue() const {
2454 const char *Base = getRawDataValues().data();
2456 // Compare elements 1+ to the 0'th element.
2457 unsigned EltSize = getElementByteSize();
2458 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2459 if (memcmp(Base, Base+i*EltSize, EltSize))
2462 // If they're all the same, return the 0th one as a representative.
2463 return getElementAsConstant(0);
2466 //===----------------------------------------------------------------------===//
2467 // replaceUsesOfWithOnConstant implementations
2469 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2470 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2473 /// Note that we intentionally replace all uses of From with To here. Consider
2474 /// a large array that uses 'From' 1000 times. By handling this case all here,
2475 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2476 /// single invocation handles all 1000 uses. Handling them one at a time would
2477 /// work, but would be really slow because it would have to unique each updated
2480 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2482 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2483 Constant *ToC = cast<Constant>(To);
2485 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2487 SmallVector<Constant*, 8> Values;
2488 LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
2489 Lookup.first = cast<ArrayType>(getType());
2490 Values.reserve(getNumOperands()); // Build replacement array.
2492 // Fill values with the modified operands of the constant array. Also,
2493 // compute whether this turns into an all-zeros array.
2494 unsigned NumUpdated = 0;
2496 // Keep track of whether all the values in the array are "ToC".
2497 bool AllSame = true;
2498 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2499 Constant *Val = cast<Constant>(O->get());
2504 Values.push_back(Val);
2505 AllSame &= Val == ToC;
2508 Constant *Replacement = 0;
2509 if (AllSame && ToC->isNullValue()) {
2510 Replacement = ConstantAggregateZero::get(getType());
2511 } else if (AllSame && isa<UndefValue>(ToC)) {
2512 Replacement = UndefValue::get(getType());
2514 // Check to see if we have this array type already.
2515 Lookup.second = makeArrayRef(Values);
2516 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2517 pImpl->ArrayConstants.find(Lookup);
2519 if (I != pImpl->ArrayConstants.map_end()) {
2520 Replacement = I->first;
2522 // Okay, the new shape doesn't exist in the system yet. Instead of
2523 // creating a new constant array, inserting it, replaceallusesof'ing the
2524 // old with the new, then deleting the old... just update the current one
2526 pImpl->ArrayConstants.remove(this);
2528 // Update to the new value. Optimize for the case when we have a single
2529 // operand that we're changing, but handle bulk updates efficiently.
2530 if (NumUpdated == 1) {
2531 unsigned OperandToUpdate = U - OperandList;
2532 assert(getOperand(OperandToUpdate) == From &&
2533 "ReplaceAllUsesWith broken!");
2534 setOperand(OperandToUpdate, ToC);
2536 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2537 if (getOperand(i) == From)
2540 pImpl->ArrayConstants.insert(this);
2545 // Otherwise, I do need to replace this with an existing value.
2546 assert(Replacement != this && "I didn't contain From!");
2548 // Everyone using this now uses the replacement.
2549 replaceAllUsesWith(Replacement);
2551 // Delete the old constant!
2555 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2557 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2558 Constant *ToC = cast<Constant>(To);
2560 unsigned OperandToUpdate = U-OperandList;
2561 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2563 SmallVector<Constant*, 8> Values;
2564 LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
2565 Lookup.first = cast<StructType>(getType());
2566 Values.reserve(getNumOperands()); // Build replacement struct.
2568 // Fill values with the modified operands of the constant struct. Also,
2569 // compute whether this turns into an all-zeros struct.
2570 bool isAllZeros = false;
2571 bool isAllUndef = false;
2572 if (ToC->isNullValue()) {
2574 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2575 Constant *Val = cast<Constant>(O->get());
2576 Values.push_back(Val);
2577 if (isAllZeros) isAllZeros = Val->isNullValue();
2579 } else if (isa<UndefValue>(ToC)) {
2581 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2582 Constant *Val = cast<Constant>(O->get());
2583 Values.push_back(Val);
2584 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2587 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2588 Values.push_back(cast<Constant>(O->get()));
2590 Values[OperandToUpdate] = ToC;
2592 LLVMContextImpl *pImpl = getContext().pImpl;
2594 Constant *Replacement = 0;
2596 Replacement = ConstantAggregateZero::get(getType());
2597 } else if (isAllUndef) {
2598 Replacement = UndefValue::get(getType());
2600 // Check to see if we have this struct type already.
2601 Lookup.second = makeArrayRef(Values);
2602 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2603 pImpl->StructConstants.find(Lookup);
2605 if (I != pImpl->StructConstants.map_end()) {
2606 Replacement = I->first;
2608 // Okay, the new shape doesn't exist in the system yet. Instead of
2609 // creating a new constant struct, inserting it, replaceallusesof'ing the
2610 // old with the new, then deleting the old... just update the current one
2612 pImpl->StructConstants.remove(this);
2614 // Update to the new value.
2615 setOperand(OperandToUpdate, ToC);
2616 pImpl->StructConstants.insert(this);
2621 assert(Replacement != this && "I didn't contain From!");
2623 // Everyone using this now uses the replacement.
2624 replaceAllUsesWith(Replacement);
2626 // Delete the old constant!
2630 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2632 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2634 SmallVector<Constant*, 8> Values;
2635 Values.reserve(getNumOperands()); // Build replacement array...
2636 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2637 Constant *Val = getOperand(i);
2638 if (Val == From) Val = cast<Constant>(To);
2639 Values.push_back(Val);
2642 Constant *Replacement = get(Values);
2643 assert(Replacement != this && "I didn't contain From!");
2645 // Everyone using this now uses the replacement.
2646 replaceAllUsesWith(Replacement);
2648 // Delete the old constant!
2652 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2654 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2655 Constant *To = cast<Constant>(ToV);
2657 SmallVector<Constant*, 8> NewOps;
2658 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2659 Constant *Op = getOperand(i);
2660 NewOps.push_back(Op == From ? To : Op);
2663 Constant *Replacement = getWithOperands(NewOps);
2664 assert(Replacement != this && "I didn't contain From!");
2666 // Everyone using this now uses the replacement.
2667 replaceAllUsesWith(Replacement);
2669 // Delete the old constant!