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/IR/Constants.h"
15 #include "ConstantFold.h"
16 #include "LLVMContextImpl.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/FoldingSet.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/GlobalValue.h"
25 #include "llvm/IR/Instructions.h"
26 #include "llvm/IR/Module.h"
27 #include "llvm/IR/Operator.h"
28 #include "llvm/Support/Compiler.h"
29 #include "llvm/Support/Debug.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/Support/ManagedStatic.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Support/raw_ostream.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 // Equivalent for a vector of -0.0's.
51 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
52 if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue()))
53 if (SplatCFP && SplatCFP->isZero() && SplatCFP->isNegative())
56 // We've already handled true FP case; any other FP vectors can't represent -0.0.
57 if (getType()->isFPOrFPVectorTy())
60 // Otherwise, just use +0.0.
64 // Return true iff this constant is positive zero (floating point), negative
65 // zero (floating point), or a null value.
66 bool Constant::isZeroValue() const {
67 // Floating point values have an explicit -0.0 value.
68 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
71 // Otherwise, just use +0.0.
75 bool Constant::isNullValue() const {
77 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
81 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
82 return CFP->isZero() && !CFP->isNegative();
84 // constant zero is zero for aggregates and cpnull is null for pointers.
85 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
88 bool Constant::isAllOnesValue() const {
89 // Check for -1 integers
90 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
91 return CI->isMinusOne();
93 // Check for FP which are bitcasted from -1 integers
94 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
95 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
97 // Check for constant vectors which are splats of -1 values.
98 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
99 if (Constant *Splat = CV->getSplatValue())
100 return Splat->isAllOnesValue();
102 // Check for constant vectors which are splats of -1 values.
103 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
104 if (Constant *Splat = CV->getSplatValue())
105 return Splat->isAllOnesValue();
110 // Constructor to create a '0' constant of arbitrary type...
111 Constant *Constant::getNullValue(Type *Ty) {
112 switch (Ty->getTypeID()) {
113 case Type::IntegerTyID:
114 return ConstantInt::get(Ty, 0);
116 return ConstantFP::get(Ty->getContext(),
117 APFloat::getZero(APFloat::IEEEhalf));
118 case Type::FloatTyID:
119 return ConstantFP::get(Ty->getContext(),
120 APFloat::getZero(APFloat::IEEEsingle));
121 case Type::DoubleTyID:
122 return ConstantFP::get(Ty->getContext(),
123 APFloat::getZero(APFloat::IEEEdouble));
124 case Type::X86_FP80TyID:
125 return ConstantFP::get(Ty->getContext(),
126 APFloat::getZero(APFloat::x87DoubleExtended));
127 case Type::FP128TyID:
128 return ConstantFP::get(Ty->getContext(),
129 APFloat::getZero(APFloat::IEEEquad));
130 case Type::PPC_FP128TyID:
131 return ConstantFP::get(Ty->getContext(),
132 APFloat(APFloat::PPCDoubleDouble,
133 APInt::getNullValue(128)));
134 case Type::PointerTyID:
135 return ConstantPointerNull::get(cast<PointerType>(Ty));
136 case Type::StructTyID:
137 case Type::ArrayTyID:
138 case Type::VectorTyID:
139 return ConstantAggregateZero::get(Ty);
141 // Function, Label, or Opaque type?
142 llvm_unreachable("Cannot create a null constant of that type!");
146 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
147 Type *ScalarTy = Ty->getScalarType();
149 // Create the base integer constant.
150 Constant *C = ConstantInt::get(Ty->getContext(), V);
152 // Convert an integer to a pointer, if necessary.
153 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
154 C = ConstantExpr::getIntToPtr(C, PTy);
156 // Broadcast a scalar to a vector, if necessary.
157 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
158 C = ConstantVector::getSplat(VTy->getNumElements(), C);
163 Constant *Constant::getAllOnesValue(Type *Ty) {
164 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
165 return ConstantInt::get(Ty->getContext(),
166 APInt::getAllOnesValue(ITy->getBitWidth()));
168 if (Ty->isFloatingPointTy()) {
169 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
170 !Ty->isPPC_FP128Ty());
171 return ConstantFP::get(Ty->getContext(), FL);
174 VectorType *VTy = cast<VectorType>(Ty);
175 return ConstantVector::getSplat(VTy->getNumElements(),
176 getAllOnesValue(VTy->getElementType()));
179 /// getAggregateElement - For aggregates (struct/array/vector) return the
180 /// constant that corresponds to the specified element if possible, or null if
181 /// not. This can return null if the element index is a ConstantExpr, or if
182 /// 'this' is a constant expr.
183 Constant *Constant::getAggregateElement(unsigned Elt) const {
184 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
185 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
187 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
188 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
190 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
191 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
193 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
194 return CAZ->getElementValue(Elt);
196 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
197 return UV->getElementValue(Elt);
199 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
200 return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt) : 0;
204 Constant *Constant::getAggregateElement(Constant *Elt) const {
205 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
206 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
207 return getAggregateElement(CI->getZExtValue());
212 void Constant::destroyConstantImpl() {
213 // When a Constant is destroyed, there may be lingering
214 // references to the constant by other constants in the constant pool. These
215 // constants are implicitly dependent on the module that is being deleted,
216 // but they don't know that. Because we only find out when the CPV is
217 // deleted, we must now notify all of our users (that should only be
218 // Constants) that they are, in fact, invalid now and should be deleted.
220 while (!use_empty()) {
221 Value *V = use_back();
222 #ifndef NDEBUG // Only in -g mode...
223 if (!isa<Constant>(V)) {
224 dbgs() << "While deleting: " << *this
225 << "\n\nUse still stuck around after Def is destroyed: "
229 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
230 cast<Constant>(V)->destroyConstant();
232 // The constant should remove itself from our use list...
233 assert((use_empty() || use_back() != V) && "Constant not removed!");
236 // Value has no outstanding references it is safe to delete it now...
240 static bool canTrapImpl(const Constant *C,
241 SmallPtrSet<const ConstantExpr *, 4> &NonTrappingOps) {
242 assert(C->getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
243 // The only thing that could possibly trap are constant exprs.
244 const ConstantExpr *CE = dyn_cast<ConstantExpr>(C);
248 // ConstantExpr traps if any operands can trap.
249 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
250 if (ConstantExpr *Op = dyn_cast<ConstantExpr>(CE->getOperand(i))) {
251 if (NonTrappingOps.insert(Op) && canTrapImpl(Op, NonTrappingOps))
256 // Otherwise, only specific operations can trap.
257 switch (CE->getOpcode()) {
260 case Instruction::UDiv:
261 case Instruction::SDiv:
262 case Instruction::FDiv:
263 case Instruction::URem:
264 case Instruction::SRem:
265 case Instruction::FRem:
266 // Div and rem can trap if the RHS is not known to be non-zero.
267 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
273 /// canTrap - Return true if evaluation of this constant could trap. This is
274 /// true for things like constant expressions that could divide by zero.
275 bool Constant::canTrap() const {
276 SmallPtrSet<const ConstantExpr *, 4> NonTrappingOps;
277 return canTrapImpl(this, NonTrappingOps);
280 /// isThreadDependent - Return true if the value can vary between threads.
281 bool Constant::isThreadDependent() const {
282 SmallPtrSet<const Constant*, 64> Visited;
283 SmallVector<const Constant*, 64> WorkList;
284 WorkList.push_back(this);
285 Visited.insert(this);
287 while (!WorkList.empty()) {
288 const Constant *C = WorkList.pop_back_val();
290 if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
291 if (GV->isThreadLocal())
295 for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
296 const Constant *D = dyn_cast<Constant>(C->getOperand(I));
299 if (Visited.insert(D))
300 WorkList.push_back(D);
307 /// isConstantUsed - Return true if the constant has users other than constant
308 /// exprs and other dangling things.
309 bool Constant::isConstantUsed() const {
310 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
311 const Constant *UC = dyn_cast<Constant>(*UI);
312 if (UC == 0 || isa<GlobalValue>(UC))
315 if (UC->isConstantUsed())
323 /// getRelocationInfo - This method classifies the entry according to
324 /// whether or not it may generate a relocation entry. This must be
325 /// conservative, so if it might codegen to a relocatable entry, it should say
326 /// so. The return values are:
328 /// NoRelocation: This constant pool entry is guaranteed to never have a
329 /// relocation applied to it (because it holds a simple constant like
331 /// LocalRelocation: This entry has relocations, but the entries are
332 /// guaranteed to be resolvable by the static linker, so the dynamic
333 /// linker will never see them.
334 /// GlobalRelocations: This entry may have arbitrary relocations.
336 /// FIXME: This really should not be in IR.
337 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
338 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
339 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
340 return LocalRelocation; // Local to this file/library.
341 return GlobalRelocations; // Global reference.
344 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
345 return BA->getFunction()->getRelocationInfo();
347 // While raw uses of blockaddress need to be relocated, differences between
348 // two of them don't when they are for labels in the same function. This is a
349 // common idiom when creating a table for the indirect goto extension, so we
350 // handle it efficiently here.
351 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
352 if (CE->getOpcode() == Instruction::Sub) {
353 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
354 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
356 LHS->getOpcode() == Instruction::PtrToInt &&
357 RHS->getOpcode() == Instruction::PtrToInt &&
358 isa<BlockAddress>(LHS->getOperand(0)) &&
359 isa<BlockAddress>(RHS->getOperand(0)) &&
360 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
361 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
365 PossibleRelocationsTy Result = NoRelocation;
366 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
367 Result = std::max(Result,
368 cast<Constant>(getOperand(i))->getRelocationInfo());
373 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
374 /// it. This involves recursively eliminating any dead users of the
376 static bool removeDeadUsersOfConstant(const Constant *C) {
377 if (isa<GlobalValue>(C)) return false; // Cannot remove this
379 while (!C->use_empty()) {
380 const Constant *User = dyn_cast<Constant>(C->use_back());
381 if (!User) return false; // Non-constant usage;
382 if (!removeDeadUsersOfConstant(User))
383 return false; // Constant wasn't dead
386 const_cast<Constant*>(C)->destroyConstant();
391 /// removeDeadConstantUsers - If there are any dead constant users dangling
392 /// off of this constant, remove them. This method is useful for clients
393 /// that want to check to see if a global is unused, but don't want to deal
394 /// with potentially dead constants hanging off of the globals.
395 void Constant::removeDeadConstantUsers() const {
396 Value::const_use_iterator I = use_begin(), E = use_end();
397 Value::const_use_iterator LastNonDeadUser = E;
399 const Constant *User = dyn_cast<Constant>(*I);
406 if (!removeDeadUsersOfConstant(User)) {
407 // If the constant wasn't dead, remember that this was the last live use
408 // and move on to the next constant.
414 // If the constant was dead, then the iterator is invalidated.
415 if (LastNonDeadUser == E) {
427 //===----------------------------------------------------------------------===//
429 //===----------------------------------------------------------------------===//
431 void ConstantInt::anchor() { }
433 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
434 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
435 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
438 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
439 LLVMContextImpl *pImpl = Context.pImpl;
440 if (!pImpl->TheTrueVal)
441 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
442 return pImpl->TheTrueVal;
445 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
446 LLVMContextImpl *pImpl = Context.pImpl;
447 if (!pImpl->TheFalseVal)
448 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
449 return pImpl->TheFalseVal;
452 Constant *ConstantInt::getTrue(Type *Ty) {
453 VectorType *VTy = dyn_cast<VectorType>(Ty);
455 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
456 return ConstantInt::getTrue(Ty->getContext());
458 assert(VTy->getElementType()->isIntegerTy(1) &&
459 "True must be vector of i1 or i1.");
460 return ConstantVector::getSplat(VTy->getNumElements(),
461 ConstantInt::getTrue(Ty->getContext()));
464 Constant *ConstantInt::getFalse(Type *Ty) {
465 VectorType *VTy = dyn_cast<VectorType>(Ty);
467 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
468 return ConstantInt::getFalse(Ty->getContext());
470 assert(VTy->getElementType()->isIntegerTy(1) &&
471 "False must be vector of i1 or i1.");
472 return ConstantVector::getSplat(VTy->getNumElements(),
473 ConstantInt::getFalse(Ty->getContext()));
477 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
478 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
479 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
480 // compare APInt's of different widths, which would violate an APInt class
481 // invariant which generates an assertion.
482 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
483 // Get the corresponding integer type for the bit width of the value.
484 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
485 // get an existing value or the insertion position
486 LLVMContextImpl *pImpl = Context.pImpl;
487 ConstantInt *&Slot = pImpl->IntConstants[DenseMapAPIntKeyInfo::KeyTy(V, ITy)];
488 if (!Slot) Slot = new ConstantInt(ITy, V);
492 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
493 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
495 // For vectors, broadcast the value.
496 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
497 return ConstantVector::getSplat(VTy->getNumElements(), C);
502 ConstantInt *ConstantInt::get(IntegerType *Ty, uint64_t V,
504 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
507 ConstantInt *ConstantInt::getSigned(IntegerType *Ty, int64_t V) {
508 return get(Ty, V, true);
511 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
512 return get(Ty, V, true);
515 Constant *ConstantInt::get(Type *Ty, const APInt& V) {
516 ConstantInt *C = get(Ty->getContext(), V);
517 assert(C->getType() == Ty->getScalarType() &&
518 "ConstantInt type doesn't match the type implied by its value!");
520 // For vectors, broadcast the value.
521 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
522 return ConstantVector::getSplat(VTy->getNumElements(), C);
527 ConstantInt *ConstantInt::get(IntegerType* Ty, StringRef Str,
529 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
532 //===----------------------------------------------------------------------===//
534 //===----------------------------------------------------------------------===//
536 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
538 return &APFloat::IEEEhalf;
540 return &APFloat::IEEEsingle;
541 if (Ty->isDoubleTy())
542 return &APFloat::IEEEdouble;
543 if (Ty->isX86_FP80Ty())
544 return &APFloat::x87DoubleExtended;
545 else if (Ty->isFP128Ty())
546 return &APFloat::IEEEquad;
548 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
549 return &APFloat::PPCDoubleDouble;
552 void ConstantFP::anchor() { }
554 /// get() - This returns a constant fp for the specified value in the
555 /// specified type. This should only be used for simple constant values like
556 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
557 Constant *ConstantFP::get(Type *Ty, double V) {
558 LLVMContext &Context = Ty->getContext();
562 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
563 APFloat::rmNearestTiesToEven, &ignored);
564 Constant *C = get(Context, FV);
566 // For vectors, broadcast the value.
567 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
568 return ConstantVector::getSplat(VTy->getNumElements(), C);
574 Constant *ConstantFP::get(Type *Ty, StringRef Str) {
575 LLVMContext &Context = Ty->getContext();
577 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
578 Constant *C = get(Context, FV);
580 // For vectors, broadcast the value.
581 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
582 return ConstantVector::getSplat(VTy->getNumElements(), C);
587 Constant *ConstantFP::getNegativeZero(Type *Ty) {
588 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
589 APFloat NegZero = APFloat::getZero(Semantics, /*Negative=*/true);
590 Constant *C = get(Ty->getContext(), NegZero);
592 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
593 return ConstantVector::getSplat(VTy->getNumElements(), C);
599 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
600 if (Ty->isFPOrFPVectorTy())
601 return getNegativeZero(Ty);
603 return Constant::getNullValue(Ty);
607 // ConstantFP accessors.
608 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
609 LLVMContextImpl* pImpl = Context.pImpl;
611 ConstantFP *&Slot = pImpl->FPConstants[DenseMapAPFloatKeyInfo::KeyTy(V)];
615 if (&V.getSemantics() == &APFloat::IEEEhalf)
616 Ty = Type::getHalfTy(Context);
617 else if (&V.getSemantics() == &APFloat::IEEEsingle)
618 Ty = Type::getFloatTy(Context);
619 else if (&V.getSemantics() == &APFloat::IEEEdouble)
620 Ty = Type::getDoubleTy(Context);
621 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
622 Ty = Type::getX86_FP80Ty(Context);
623 else if (&V.getSemantics() == &APFloat::IEEEquad)
624 Ty = Type::getFP128Ty(Context);
626 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
627 "Unknown FP format");
628 Ty = Type::getPPC_FP128Ty(Context);
630 Slot = new ConstantFP(Ty, V);
636 Constant *ConstantFP::getInfinity(Type *Ty, bool Negative) {
637 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
638 Constant *C = get(Ty->getContext(), APFloat::getInf(Semantics, Negative));
640 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
641 return ConstantVector::getSplat(VTy->getNumElements(), C);
646 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
647 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
648 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
652 bool ConstantFP::isExactlyValue(const APFloat &V) const {
653 return Val.bitwiseIsEqual(V);
656 //===----------------------------------------------------------------------===//
657 // ConstantAggregateZero Implementation
658 //===----------------------------------------------------------------------===//
660 /// getSequentialElement - If this CAZ has array or vector type, return a zero
661 /// with the right element type.
662 Constant *ConstantAggregateZero::getSequentialElement() const {
663 return Constant::getNullValue(getType()->getSequentialElementType());
666 /// getStructElement - If this CAZ has struct type, return a zero with the
667 /// right element type for the specified element.
668 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
669 return Constant::getNullValue(getType()->getStructElementType(Elt));
672 /// getElementValue - Return a zero of the right value for the specified GEP
673 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
674 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
675 if (isa<SequentialType>(getType()))
676 return getSequentialElement();
677 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
680 /// getElementValue - Return a zero of the right value for the specified GEP
682 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
683 if (isa<SequentialType>(getType()))
684 return getSequentialElement();
685 return getStructElement(Idx);
689 //===----------------------------------------------------------------------===//
690 // UndefValue Implementation
691 //===----------------------------------------------------------------------===//
693 /// getSequentialElement - If this undef has array or vector type, return an
694 /// undef with the right element type.
695 UndefValue *UndefValue::getSequentialElement() const {
696 return UndefValue::get(getType()->getSequentialElementType());
699 /// getStructElement - If this undef has struct type, return a zero with the
700 /// right element type for the specified element.
701 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
702 return UndefValue::get(getType()->getStructElementType(Elt));
705 /// getElementValue - Return an undef of the right value for the specified GEP
706 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
707 UndefValue *UndefValue::getElementValue(Constant *C) const {
708 if (isa<SequentialType>(getType()))
709 return getSequentialElement();
710 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
713 /// getElementValue - Return an undef of the right value for the specified GEP
715 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
716 if (isa<SequentialType>(getType()))
717 return getSequentialElement();
718 return getStructElement(Idx);
723 //===----------------------------------------------------------------------===//
724 // ConstantXXX Classes
725 //===----------------------------------------------------------------------===//
727 template <typename ItTy, typename EltTy>
728 static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
729 for (; Start != End; ++Start)
735 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
736 : Constant(T, ConstantArrayVal,
737 OperandTraits<ConstantArray>::op_end(this) - V.size(),
739 assert(V.size() == T->getNumElements() &&
740 "Invalid initializer vector for constant array");
741 for (unsigned i = 0, e = V.size(); i != e; ++i)
742 assert(V[i]->getType() == T->getElementType() &&
743 "Initializer for array element doesn't match array element type!");
744 std::copy(V.begin(), V.end(), op_begin());
747 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
748 // Empty arrays are canonicalized to ConstantAggregateZero.
750 return ConstantAggregateZero::get(Ty);
752 for (unsigned i = 0, e = V.size(); i != e; ++i) {
753 assert(V[i]->getType() == Ty->getElementType() &&
754 "Wrong type in array element initializer");
756 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
758 // If this is an all-zero array, return a ConstantAggregateZero object. If
759 // all undef, return an UndefValue, if "all simple", then return a
760 // ConstantDataArray.
762 if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
763 return UndefValue::get(Ty);
765 if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
766 return ConstantAggregateZero::get(Ty);
768 // Check to see if all of the elements are ConstantFP or ConstantInt and if
769 // the element type is compatible with ConstantDataVector. If so, use it.
770 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
771 // We speculatively build the elements here even if it turns out that there
772 // is a constantexpr or something else weird in the array, since it is so
773 // uncommon for that to happen.
774 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
775 if (CI->getType()->isIntegerTy(8)) {
776 SmallVector<uint8_t, 16> Elts;
777 for (unsigned i = 0, e = V.size(); i != e; ++i)
778 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
779 Elts.push_back(CI->getZExtValue());
782 if (Elts.size() == V.size())
783 return ConstantDataArray::get(C->getContext(), Elts);
784 } else if (CI->getType()->isIntegerTy(16)) {
785 SmallVector<uint16_t, 16> Elts;
786 for (unsigned i = 0, e = V.size(); i != e; ++i)
787 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
788 Elts.push_back(CI->getZExtValue());
791 if (Elts.size() == V.size())
792 return ConstantDataArray::get(C->getContext(), Elts);
793 } else if (CI->getType()->isIntegerTy(32)) {
794 SmallVector<uint32_t, 16> Elts;
795 for (unsigned i = 0, e = V.size(); i != e; ++i)
796 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
797 Elts.push_back(CI->getZExtValue());
800 if (Elts.size() == V.size())
801 return ConstantDataArray::get(C->getContext(), Elts);
802 } else if (CI->getType()->isIntegerTy(64)) {
803 SmallVector<uint64_t, 16> Elts;
804 for (unsigned i = 0, e = V.size(); i != e; ++i)
805 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
806 Elts.push_back(CI->getZExtValue());
809 if (Elts.size() == V.size())
810 return ConstantDataArray::get(C->getContext(), Elts);
814 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
815 if (CFP->getType()->isFloatTy()) {
816 SmallVector<float, 16> Elts;
817 for (unsigned i = 0, e = V.size(); i != e; ++i)
818 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
819 Elts.push_back(CFP->getValueAPF().convertToFloat());
822 if (Elts.size() == V.size())
823 return ConstantDataArray::get(C->getContext(), Elts);
824 } else if (CFP->getType()->isDoubleTy()) {
825 SmallVector<double, 16> Elts;
826 for (unsigned i = 0, e = V.size(); i != e; ++i)
827 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
828 Elts.push_back(CFP->getValueAPF().convertToDouble());
831 if (Elts.size() == V.size())
832 return ConstantDataArray::get(C->getContext(), Elts);
837 // Otherwise, we really do want to create a ConstantArray.
838 return pImpl->ArrayConstants.getOrCreate(Ty, V);
841 /// getTypeForElements - Return an anonymous struct type to use for a constant
842 /// with the specified set of elements. The list must not be empty.
843 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
844 ArrayRef<Constant*> V,
846 unsigned VecSize = V.size();
847 SmallVector<Type*, 16> EltTypes(VecSize);
848 for (unsigned i = 0; i != VecSize; ++i)
849 EltTypes[i] = V[i]->getType();
851 return StructType::get(Context, EltTypes, Packed);
855 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
858 "ConstantStruct::getTypeForElements cannot be called on empty list");
859 return getTypeForElements(V[0]->getContext(), V, Packed);
863 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
864 : Constant(T, ConstantStructVal,
865 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
867 assert(V.size() == T->getNumElements() &&
868 "Invalid initializer vector for constant structure");
869 for (unsigned i = 0, e = V.size(); i != e; ++i)
870 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
871 "Initializer for struct element doesn't match struct element type!");
872 std::copy(V.begin(), V.end(), op_begin());
875 // ConstantStruct accessors.
876 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
877 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
878 "Incorrect # elements specified to ConstantStruct::get");
880 // Create a ConstantAggregateZero value if all elements are zeros.
882 bool isUndef = false;
885 isUndef = isa<UndefValue>(V[0]);
886 isZero = V[0]->isNullValue();
887 if (isUndef || isZero) {
888 for (unsigned i = 0, e = V.size(); i != e; ++i) {
889 if (!V[i]->isNullValue())
891 if (!isa<UndefValue>(V[i]))
897 return ConstantAggregateZero::get(ST);
899 return UndefValue::get(ST);
901 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
904 Constant *ConstantStruct::get(StructType *T, ...) {
906 SmallVector<Constant*, 8> Values;
908 while (Constant *Val = va_arg(ap, llvm::Constant*))
909 Values.push_back(Val);
911 return get(T, Values);
914 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
915 : Constant(T, ConstantVectorVal,
916 OperandTraits<ConstantVector>::op_end(this) - V.size(),
918 for (size_t i = 0, e = V.size(); i != e; i++)
919 assert(V[i]->getType() == T->getElementType() &&
920 "Initializer for vector element doesn't match vector element type!");
921 std::copy(V.begin(), V.end(), op_begin());
924 // ConstantVector accessors.
925 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
926 assert(!V.empty() && "Vectors can't be empty");
927 VectorType *T = VectorType::get(V.front()->getType(), V.size());
928 LLVMContextImpl *pImpl = T->getContext().pImpl;
930 // If this is an all-undef or all-zero vector, return a
931 // ConstantAggregateZero or UndefValue.
933 bool isZero = C->isNullValue();
934 bool isUndef = isa<UndefValue>(C);
936 if (isZero || isUndef) {
937 for (unsigned i = 1, e = V.size(); i != e; ++i)
939 isZero = isUndef = false;
945 return ConstantAggregateZero::get(T);
947 return UndefValue::get(T);
949 // Check to see if all of the elements are ConstantFP or ConstantInt and if
950 // the element type is compatible with ConstantDataVector. If so, use it.
951 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
952 // We speculatively build the elements here even if it turns out that there
953 // is a constantexpr or something else weird in the array, since it is so
954 // uncommon for that to happen.
955 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
956 if (CI->getType()->isIntegerTy(8)) {
957 SmallVector<uint8_t, 16> Elts;
958 for (unsigned i = 0, e = V.size(); i != e; ++i)
959 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
960 Elts.push_back(CI->getZExtValue());
963 if (Elts.size() == V.size())
964 return ConstantDataVector::get(C->getContext(), Elts);
965 } else if (CI->getType()->isIntegerTy(16)) {
966 SmallVector<uint16_t, 16> Elts;
967 for (unsigned i = 0, e = V.size(); i != e; ++i)
968 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
969 Elts.push_back(CI->getZExtValue());
972 if (Elts.size() == V.size())
973 return ConstantDataVector::get(C->getContext(), Elts);
974 } else if (CI->getType()->isIntegerTy(32)) {
975 SmallVector<uint32_t, 16> Elts;
976 for (unsigned i = 0, e = V.size(); i != e; ++i)
977 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
978 Elts.push_back(CI->getZExtValue());
981 if (Elts.size() == V.size())
982 return ConstantDataVector::get(C->getContext(), Elts);
983 } else if (CI->getType()->isIntegerTy(64)) {
984 SmallVector<uint64_t, 16> Elts;
985 for (unsigned i = 0, e = V.size(); i != e; ++i)
986 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
987 Elts.push_back(CI->getZExtValue());
990 if (Elts.size() == V.size())
991 return ConstantDataVector::get(C->getContext(), Elts);
995 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
996 if (CFP->getType()->isFloatTy()) {
997 SmallVector<float, 16> Elts;
998 for (unsigned i = 0, e = V.size(); i != e; ++i)
999 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1000 Elts.push_back(CFP->getValueAPF().convertToFloat());
1003 if (Elts.size() == V.size())
1004 return ConstantDataVector::get(C->getContext(), Elts);
1005 } else if (CFP->getType()->isDoubleTy()) {
1006 SmallVector<double, 16> Elts;
1007 for (unsigned i = 0, e = V.size(); i != e; ++i)
1008 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1009 Elts.push_back(CFP->getValueAPF().convertToDouble());
1012 if (Elts.size() == V.size())
1013 return ConstantDataVector::get(C->getContext(), Elts);
1018 // Otherwise, the element type isn't compatible with ConstantDataVector, or
1019 // the operand list constants a ConstantExpr or something else strange.
1020 return pImpl->VectorConstants.getOrCreate(T, V);
1023 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
1024 // If this splat is compatible with ConstantDataVector, use it instead of
1026 if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
1027 ConstantDataSequential::isElementTypeCompatible(V->getType()))
1028 return ConstantDataVector::getSplat(NumElts, V);
1030 SmallVector<Constant*, 32> Elts(NumElts, V);
1035 // Utility function for determining if a ConstantExpr is a CastOp or not. This
1036 // can't be inline because we don't want to #include Instruction.h into
1038 bool ConstantExpr::isCast() const {
1039 return Instruction::isCast(getOpcode());
1042 bool ConstantExpr::isCompare() const {
1043 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
1046 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
1047 if (getOpcode() != Instruction::GetElementPtr) return false;
1049 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
1050 User::const_op_iterator OI = llvm::next(this->op_begin());
1052 // Skip the first index, as it has no static limit.
1056 // The remaining indices must be compile-time known integers within the
1057 // bounds of the corresponding notional static array types.
1058 for (; GEPI != E; ++GEPI, ++OI) {
1059 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
1060 if (!CI) return false;
1061 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
1062 if (CI->getValue().getActiveBits() > 64 ||
1063 CI->getZExtValue() >= ATy->getNumElements())
1067 // All the indices checked out.
1071 bool ConstantExpr::hasIndices() const {
1072 return getOpcode() == Instruction::ExtractValue ||
1073 getOpcode() == Instruction::InsertValue;
1076 ArrayRef<unsigned> ConstantExpr::getIndices() const {
1077 if (const ExtractValueConstantExpr *EVCE =
1078 dyn_cast<ExtractValueConstantExpr>(this))
1079 return EVCE->Indices;
1081 return cast<InsertValueConstantExpr>(this)->Indices;
1084 unsigned ConstantExpr::getPredicate() const {
1085 assert(isCompare());
1086 return ((const CompareConstantExpr*)this)->predicate;
1089 /// getWithOperandReplaced - Return a constant expression identical to this
1090 /// one, but with the specified operand set to the specified value.
1092 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
1093 assert(Op->getType() == getOperand(OpNo)->getType() &&
1094 "Replacing operand with value of different type!");
1095 if (getOperand(OpNo) == Op)
1096 return const_cast<ConstantExpr*>(this);
1098 SmallVector<Constant*, 8> NewOps;
1099 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1100 NewOps.push_back(i == OpNo ? Op : getOperand(i));
1102 return getWithOperands(NewOps);
1105 /// getWithOperands - This returns the current constant expression with the
1106 /// operands replaced with the specified values. The specified array must
1107 /// have the same number of operands as our current one.
1108 Constant *ConstantExpr::
1109 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
1110 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
1111 bool AnyChange = Ty != getType();
1112 for (unsigned i = 0; i != Ops.size(); ++i)
1113 AnyChange |= Ops[i] != getOperand(i);
1115 if (!AnyChange) // No operands changed, return self.
1116 return const_cast<ConstantExpr*>(this);
1118 switch (getOpcode()) {
1119 case Instruction::Trunc:
1120 case Instruction::ZExt:
1121 case Instruction::SExt:
1122 case Instruction::FPTrunc:
1123 case Instruction::FPExt:
1124 case Instruction::UIToFP:
1125 case Instruction::SIToFP:
1126 case Instruction::FPToUI:
1127 case Instruction::FPToSI:
1128 case Instruction::PtrToInt:
1129 case Instruction::IntToPtr:
1130 case Instruction::BitCast:
1131 case Instruction::AddrSpaceCast:
1132 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
1133 case Instruction::Select:
1134 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
1135 case Instruction::InsertElement:
1136 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1137 case Instruction::ExtractElement:
1138 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1139 case Instruction::InsertValue:
1140 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices());
1141 case Instruction::ExtractValue:
1142 return ConstantExpr::getExtractValue(Ops[0], getIndices());
1143 case Instruction::ShuffleVector:
1144 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1145 case Instruction::GetElementPtr:
1146 return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1147 cast<GEPOperator>(this)->isInBounds());
1148 case Instruction::ICmp:
1149 case Instruction::FCmp:
1150 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1152 assert(getNumOperands() == 2 && "Must be binary operator?");
1153 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1158 //===----------------------------------------------------------------------===//
1159 // isValueValidForType implementations
1161 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1162 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1163 if (Ty->isIntegerTy(1))
1164 return Val == 0 || Val == 1;
1166 return true; // always true, has to fit in largest type
1167 uint64_t Max = (1ll << NumBits) - 1;
1171 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1172 unsigned NumBits = Ty->getIntegerBitWidth();
1173 if (Ty->isIntegerTy(1))
1174 return Val == 0 || Val == 1 || Val == -1;
1176 return true; // always true, has to fit in largest type
1177 int64_t Min = -(1ll << (NumBits-1));
1178 int64_t Max = (1ll << (NumBits-1)) - 1;
1179 return (Val >= Min && Val <= Max);
1182 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1183 // convert modifies in place, so make a copy.
1184 APFloat Val2 = APFloat(Val);
1186 switch (Ty->getTypeID()) {
1188 return false; // These can't be represented as floating point!
1190 // FIXME rounding mode needs to be more flexible
1191 case Type::HalfTyID: {
1192 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1194 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1197 case Type::FloatTyID: {
1198 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1200 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1203 case Type::DoubleTyID: {
1204 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1205 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1206 &Val2.getSemantics() == &APFloat::IEEEdouble)
1208 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1211 case Type::X86_FP80TyID:
1212 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1213 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1214 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1215 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1216 case Type::FP128TyID:
1217 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1218 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1219 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1220 &Val2.getSemantics() == &APFloat::IEEEquad;
1221 case Type::PPC_FP128TyID:
1222 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1223 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1224 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1225 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1230 //===----------------------------------------------------------------------===//
1231 // Factory Function Implementation
1233 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1234 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1235 "Cannot create an aggregate zero of non-aggregate type!");
1237 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1239 Entry = new ConstantAggregateZero(Ty);
1244 /// destroyConstant - Remove the constant from the constant table.
1246 void ConstantAggregateZero::destroyConstant() {
1247 getContext().pImpl->CAZConstants.erase(getType());
1248 destroyConstantImpl();
1251 /// destroyConstant - Remove the constant from the constant table...
1253 void ConstantArray::destroyConstant() {
1254 getType()->getContext().pImpl->ArrayConstants.remove(this);
1255 destroyConstantImpl();
1259 //---- ConstantStruct::get() implementation...
1262 // destroyConstant - Remove the constant from the constant table...
1264 void ConstantStruct::destroyConstant() {
1265 getType()->getContext().pImpl->StructConstants.remove(this);
1266 destroyConstantImpl();
1269 // destroyConstant - Remove the constant from the constant table...
1271 void ConstantVector::destroyConstant() {
1272 getType()->getContext().pImpl->VectorConstants.remove(this);
1273 destroyConstantImpl();
1276 /// getSplatValue - If this is a splat vector constant, meaning that all of
1277 /// the elements have the same value, return that value. Otherwise return 0.
1278 Constant *Constant::getSplatValue() const {
1279 assert(this->getType()->isVectorTy() && "Only valid for vectors!");
1280 if (isa<ConstantAggregateZero>(this))
1281 return getNullValue(this->getType()->getVectorElementType());
1282 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
1283 return CV->getSplatValue();
1284 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
1285 return CV->getSplatValue();
1289 /// getSplatValue - If this is a splat constant, where all of the
1290 /// elements have the same value, return that value. Otherwise return null.
1291 Constant *ConstantVector::getSplatValue() const {
1292 // Check out first element.
1293 Constant *Elt = getOperand(0);
1294 // Then make sure all remaining elements point to the same value.
1295 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1296 if (getOperand(I) != Elt)
1301 /// If C is a constant integer then return its value, otherwise C must be a
1302 /// vector of constant integers, all equal, and the common value is returned.
1303 const APInt &Constant::getUniqueInteger() const {
1304 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
1305 return CI->getValue();
1306 assert(this->getSplatValue() && "Doesn't contain a unique integer!");
1307 const Constant *C = this->getAggregateElement(0U);
1308 assert(C && isa<ConstantInt>(C) && "Not a vector of numbers!");
1309 return cast<ConstantInt>(C)->getValue();
1313 //---- ConstantPointerNull::get() implementation.
1316 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1317 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1319 Entry = new ConstantPointerNull(Ty);
1324 // destroyConstant - Remove the constant from the constant table...
1326 void ConstantPointerNull::destroyConstant() {
1327 getContext().pImpl->CPNConstants.erase(getType());
1328 // Free the constant and any dangling references to it.
1329 destroyConstantImpl();
1333 //---- UndefValue::get() implementation.
1336 UndefValue *UndefValue::get(Type *Ty) {
1337 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1339 Entry = new UndefValue(Ty);
1344 // destroyConstant - Remove the constant from the constant table.
1346 void UndefValue::destroyConstant() {
1347 // Free the constant and any dangling references to it.
1348 getContext().pImpl->UVConstants.erase(getType());
1349 destroyConstantImpl();
1352 //---- BlockAddress::get() implementation.
1355 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1356 assert(BB->getParent() != 0 && "Block must have a parent");
1357 return get(BB->getParent(), BB);
1360 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1362 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1364 BA = new BlockAddress(F, BB);
1366 assert(BA->getFunction() == F && "Basic block moved between functions");
1370 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1371 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1375 BB->AdjustBlockAddressRefCount(1);
1379 // destroyConstant - Remove the constant from the constant table.
1381 void BlockAddress::destroyConstant() {
1382 getFunction()->getType()->getContext().pImpl
1383 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1384 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1385 destroyConstantImpl();
1388 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1389 // This could be replacing either the Basic Block or the Function. In either
1390 // case, we have to remove the map entry.
1391 Function *NewF = getFunction();
1392 BasicBlock *NewBB = getBasicBlock();
1395 NewF = cast<Function>(To->stripPointerCasts());
1397 NewBB = cast<BasicBlock>(To);
1399 // See if the 'new' entry already exists, if not, just update this in place
1400 // and return early.
1401 BlockAddress *&NewBA =
1402 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1404 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1406 // Remove the old entry, this can't cause the map to rehash (just a
1407 // tombstone will get added).
1408 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1411 setOperand(0, NewF);
1412 setOperand(1, NewBB);
1413 getBasicBlock()->AdjustBlockAddressRefCount(1);
1417 // Otherwise, I do need to replace this with an existing value.
1418 assert(NewBA != this && "I didn't contain From!");
1420 // Everyone using this now uses the replacement.
1421 replaceAllUsesWith(NewBA);
1426 //---- ConstantExpr::get() implementations.
1429 /// This is a utility function to handle folding of casts and lookup of the
1430 /// cast in the ExprConstants map. It is used by the various get* methods below.
1431 static inline Constant *getFoldedCast(
1432 Instruction::CastOps opc, Constant *C, Type *Ty) {
1433 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1434 // Fold a few common cases
1435 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1438 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1440 // Look up the constant in the table first to ensure uniqueness.
1441 ExprMapKeyType Key(opc, C);
1443 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1446 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1447 Instruction::CastOps opc = Instruction::CastOps(oc);
1448 assert(Instruction::isCast(opc) && "opcode out of range");
1449 assert(C && Ty && "Null arguments to getCast");
1450 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1454 llvm_unreachable("Invalid cast opcode");
1455 case Instruction::Trunc: return getTrunc(C, Ty);
1456 case Instruction::ZExt: return getZExt(C, Ty);
1457 case Instruction::SExt: return getSExt(C, Ty);
1458 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1459 case Instruction::FPExt: return getFPExtend(C, Ty);
1460 case Instruction::UIToFP: return getUIToFP(C, Ty);
1461 case Instruction::SIToFP: return getSIToFP(C, Ty);
1462 case Instruction::FPToUI: return getFPToUI(C, Ty);
1463 case Instruction::FPToSI: return getFPToSI(C, Ty);
1464 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1465 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1466 case Instruction::BitCast: return getBitCast(C, Ty);
1467 case Instruction::AddrSpaceCast: return getAddrSpaceCast(C, Ty);
1471 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1472 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1473 return getBitCast(C, Ty);
1474 return getZExt(C, Ty);
1477 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1478 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1479 return getBitCast(C, Ty);
1480 return getSExt(C, Ty);
1483 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1484 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1485 return getBitCast(C, Ty);
1486 return getTrunc(C, Ty);
1489 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1490 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1491 assert((Ty->isIntOrIntVectorTy() || Ty->isPtrOrPtrVectorTy()) &&
1494 if (Ty->isIntOrIntVectorTy())
1495 return getPtrToInt(S, Ty);
1497 unsigned SrcAS = S->getType()->getPointerAddressSpace();
1498 if (Ty->isPtrOrPtrVectorTy() && SrcAS != Ty->getPointerAddressSpace())
1499 return getAddrSpaceCast(S, Ty);
1501 return getBitCast(S, Ty);
1504 Constant *ConstantExpr::getPointerBitCastOrAddrSpaceCast(Constant *S,
1506 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1507 assert(Ty->isPtrOrPtrVectorTy() && "Invalid cast");
1509 if (S->getType()->getPointerAddressSpace() != Ty->getPointerAddressSpace())
1510 return getAddrSpaceCast(S, Ty);
1512 return getBitCast(S, Ty);
1515 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1517 assert(C->getType()->isIntOrIntVectorTy() &&
1518 Ty->isIntOrIntVectorTy() && "Invalid cast");
1519 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1520 unsigned DstBits = Ty->getScalarSizeInBits();
1521 Instruction::CastOps opcode =
1522 (SrcBits == DstBits ? Instruction::BitCast :
1523 (SrcBits > DstBits ? Instruction::Trunc :
1524 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1525 return getCast(opcode, C, Ty);
1528 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1529 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1531 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1532 unsigned DstBits = Ty->getScalarSizeInBits();
1533 if (SrcBits == DstBits)
1534 return C; // Avoid a useless cast
1535 Instruction::CastOps opcode =
1536 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1537 return getCast(opcode, C, Ty);
1540 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1542 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1543 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1545 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1546 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1547 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1548 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1549 "SrcTy must be larger than DestTy for Trunc!");
1551 return getFoldedCast(Instruction::Trunc, C, Ty);
1554 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1556 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1557 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1559 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1560 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1561 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1562 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1563 "SrcTy must be smaller than DestTy for SExt!");
1565 return getFoldedCast(Instruction::SExt, C, Ty);
1568 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1570 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1571 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1573 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1574 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1575 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1576 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1577 "SrcTy must be smaller than DestTy for ZExt!");
1579 return getFoldedCast(Instruction::ZExt, C, Ty);
1582 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1584 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1585 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1587 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1588 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1589 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1590 "This is an illegal floating point truncation!");
1591 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1594 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1596 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1597 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1599 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1600 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1601 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1602 "This is an illegal floating point extension!");
1603 return getFoldedCast(Instruction::FPExt, C, Ty);
1606 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1608 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1609 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1611 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1612 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1613 "This is an illegal uint to floating point cast!");
1614 return getFoldedCast(Instruction::UIToFP, C, Ty);
1617 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1619 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1620 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1622 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1623 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1624 "This is an illegal sint to floating point cast!");
1625 return getFoldedCast(Instruction::SIToFP, C, Ty);
1628 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1630 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1631 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1633 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1634 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1635 "This is an illegal floating point to uint cast!");
1636 return getFoldedCast(Instruction::FPToUI, C, Ty);
1639 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1641 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1642 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1644 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1645 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1646 "This is an illegal floating point to sint cast!");
1647 return getFoldedCast(Instruction::FPToSI, C, Ty);
1650 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1651 assert(C->getType()->getScalarType()->isPointerTy() &&
1652 "PtrToInt source must be pointer or pointer vector");
1653 assert(DstTy->getScalarType()->isIntegerTy() &&
1654 "PtrToInt destination must be integer or integer vector");
1655 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1656 if (isa<VectorType>(C->getType()))
1657 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1658 "Invalid cast between a different number of vector elements");
1659 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1662 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1663 assert(C->getType()->getScalarType()->isIntegerTy() &&
1664 "IntToPtr source must be integer or integer vector");
1665 assert(DstTy->getScalarType()->isPointerTy() &&
1666 "IntToPtr destination must be a pointer or pointer vector");
1667 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1668 if (isa<VectorType>(C->getType()))
1669 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1670 "Invalid cast between a different number of vector elements");
1671 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1674 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1675 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1676 "Invalid constantexpr bitcast!");
1678 // It is common to ask for a bitcast of a value to its own type, handle this
1680 if (C->getType() == DstTy) return C;
1682 return getFoldedCast(Instruction::BitCast, C, DstTy);
1685 Constant *ConstantExpr::getAddrSpaceCast(Constant *C, Type *DstTy) {
1686 assert(CastInst::castIsValid(Instruction::AddrSpaceCast, C, DstTy) &&
1687 "Invalid constantexpr addrspacecast!");
1689 return getFoldedCast(Instruction::AddrSpaceCast, C, DstTy);
1692 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1694 // Check the operands for consistency first.
1695 assert(Opcode >= Instruction::BinaryOpsBegin &&
1696 Opcode < Instruction::BinaryOpsEnd &&
1697 "Invalid opcode in binary constant expression");
1698 assert(C1->getType() == C2->getType() &&
1699 "Operand types in binary constant expression should match");
1703 case Instruction::Add:
1704 case Instruction::Sub:
1705 case Instruction::Mul:
1706 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1707 assert(C1->getType()->isIntOrIntVectorTy() &&
1708 "Tried to create an integer operation on a non-integer type!");
1710 case Instruction::FAdd:
1711 case Instruction::FSub:
1712 case Instruction::FMul:
1713 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1714 assert(C1->getType()->isFPOrFPVectorTy() &&
1715 "Tried to create a floating-point operation on a "
1716 "non-floating-point type!");
1718 case Instruction::UDiv:
1719 case Instruction::SDiv:
1720 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1721 assert(C1->getType()->isIntOrIntVectorTy() &&
1722 "Tried to create an arithmetic operation on a non-arithmetic type!");
1724 case Instruction::FDiv:
1725 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1726 assert(C1->getType()->isFPOrFPVectorTy() &&
1727 "Tried to create an arithmetic operation on a non-arithmetic type!");
1729 case Instruction::URem:
1730 case Instruction::SRem:
1731 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1732 assert(C1->getType()->isIntOrIntVectorTy() &&
1733 "Tried to create an arithmetic operation on a non-arithmetic type!");
1735 case Instruction::FRem:
1736 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1737 assert(C1->getType()->isFPOrFPVectorTy() &&
1738 "Tried to create an arithmetic operation on a non-arithmetic type!");
1740 case Instruction::And:
1741 case Instruction::Or:
1742 case Instruction::Xor:
1743 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1744 assert(C1->getType()->isIntOrIntVectorTy() &&
1745 "Tried to create a logical operation on a non-integral type!");
1747 case Instruction::Shl:
1748 case Instruction::LShr:
1749 case Instruction::AShr:
1750 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1751 assert(C1->getType()->isIntOrIntVectorTy() &&
1752 "Tried to create a shift operation on a non-integer type!");
1759 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1760 return FC; // Fold a few common cases.
1762 Constant *ArgVec[] = { C1, C2 };
1763 ExprMapKeyType Key(Opcode, ArgVec, 0, Flags);
1765 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1766 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1769 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1770 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1771 // Note that a non-inbounds gep is used, as null isn't within any object.
1772 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1773 Constant *GEP = getGetElementPtr(
1774 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1775 return getPtrToInt(GEP,
1776 Type::getInt64Ty(Ty->getContext()));
1779 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1780 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1781 // Note that a non-inbounds gep is used, as null isn't within any object.
1783 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1784 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1785 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1786 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1787 Constant *Indices[2] = { Zero, One };
1788 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1789 return getPtrToInt(GEP,
1790 Type::getInt64Ty(Ty->getContext()));
1793 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1794 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1798 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1799 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1800 // Note that a non-inbounds gep is used, as null isn't within any object.
1801 Constant *GEPIdx[] = {
1802 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1805 Constant *GEP = getGetElementPtr(
1806 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1807 return getPtrToInt(GEP,
1808 Type::getInt64Ty(Ty->getContext()));
1811 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1812 Constant *C1, Constant *C2) {
1813 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1815 switch (Predicate) {
1816 default: llvm_unreachable("Invalid CmpInst predicate");
1817 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1818 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1819 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1820 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1821 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1822 case CmpInst::FCMP_TRUE:
1823 return getFCmp(Predicate, C1, C2);
1825 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1826 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1827 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1828 case CmpInst::ICMP_SLE:
1829 return getICmp(Predicate, C1, C2);
1833 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1834 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1836 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1837 return SC; // Fold common cases
1839 Constant *ArgVec[] = { C, V1, V2 };
1840 ExprMapKeyType Key(Instruction::Select, ArgVec);
1842 LLVMContextImpl *pImpl = C->getContext().pImpl;
1843 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1846 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1848 assert(C->getType()->isPtrOrPtrVectorTy() &&
1849 "Non-pointer type for constant GetElementPtr expression");
1851 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1852 return FC; // Fold a few common cases.
1854 // Get the result type of the getelementptr!
1855 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1856 assert(Ty && "GEP indices invalid!");
1857 unsigned AS = C->getType()->getPointerAddressSpace();
1858 Type *ReqTy = Ty->getPointerTo(AS);
1859 if (VectorType *VecTy = dyn_cast<VectorType>(C->getType()))
1860 ReqTy = VectorType::get(ReqTy, VecTy->getNumElements());
1862 // Look up the constant in the table first to ensure uniqueness
1863 std::vector<Constant*> ArgVec;
1864 ArgVec.reserve(1 + Idxs.size());
1865 ArgVec.push_back(C);
1866 for (unsigned i = 0, e = Idxs.size(); i != e; ++i) {
1867 assert(Idxs[i]->getType()->isVectorTy() == ReqTy->isVectorTy() &&
1868 "getelementptr index type missmatch");
1869 assert((!Idxs[i]->getType()->isVectorTy() ||
1870 ReqTy->getVectorNumElements() ==
1871 Idxs[i]->getType()->getVectorNumElements()) &&
1872 "getelementptr index type missmatch");
1873 ArgVec.push_back(cast<Constant>(Idxs[i]));
1875 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1876 InBounds ? GEPOperator::IsInBounds : 0);
1878 LLVMContextImpl *pImpl = C->getContext().pImpl;
1879 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1883 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1884 assert(LHS->getType() == RHS->getType());
1885 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1886 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1888 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1889 return FC; // Fold a few common cases...
1891 // Look up the constant in the table first to ensure uniqueness
1892 Constant *ArgVec[] = { LHS, RHS };
1893 // Get the key type with both the opcode and predicate
1894 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1896 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1897 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1898 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1900 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1901 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1905 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1906 assert(LHS->getType() == RHS->getType());
1907 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1909 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1910 return FC; // Fold a few common cases...
1912 // Look up the constant in the table first to ensure uniqueness
1913 Constant *ArgVec[] = { LHS, RHS };
1914 // Get the key type with both the opcode and predicate
1915 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1917 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1918 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1919 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1921 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1922 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1925 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1926 assert(Val->getType()->isVectorTy() &&
1927 "Tried to create extractelement operation on non-vector type!");
1928 assert(Idx->getType()->isIntegerTy(32) &&
1929 "Extractelement index must be i32 type!");
1931 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1932 return FC; // Fold a few common cases.
1934 // Look up the constant in the table first to ensure uniqueness
1935 Constant *ArgVec[] = { Val, Idx };
1936 const ExprMapKeyType Key(Instruction::ExtractElement, ArgVec);
1938 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1939 Type *ReqTy = Val->getType()->getVectorElementType();
1940 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1943 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1945 assert(Val->getType()->isVectorTy() &&
1946 "Tried to create insertelement operation on non-vector type!");
1947 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1948 "Insertelement types must match!");
1949 assert(Idx->getType()->isIntegerTy(32) &&
1950 "Insertelement index must be i32 type!");
1952 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1953 return FC; // Fold a few common cases.
1954 // Look up the constant in the table first to ensure uniqueness
1955 Constant *ArgVec[] = { Val, Elt, Idx };
1956 const ExprMapKeyType Key(Instruction::InsertElement, ArgVec);
1958 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1959 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1962 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1964 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1965 "Invalid shuffle vector constant expr operands!");
1967 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1968 return FC; // Fold a few common cases.
1970 unsigned NElts = Mask->getType()->getVectorNumElements();
1971 Type *EltTy = V1->getType()->getVectorElementType();
1972 Type *ShufTy = VectorType::get(EltTy, NElts);
1974 // Look up the constant in the table first to ensure uniqueness
1975 Constant *ArgVec[] = { V1, V2, Mask };
1976 const ExprMapKeyType Key(Instruction::ShuffleVector, ArgVec);
1978 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1979 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1982 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1983 ArrayRef<unsigned> Idxs) {
1984 assert(Agg->getType()->isFirstClassType() &&
1985 "Non-first-class type for constant insertvalue expression");
1987 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1988 Idxs) == Val->getType() &&
1989 "insertvalue indices invalid!");
1990 Type *ReqTy = Val->getType();
1992 if (Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs))
1995 Constant *ArgVec[] = { Agg, Val };
1996 const ExprMapKeyType Key(Instruction::InsertValue, ArgVec, 0, 0, Idxs);
1998 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
1999 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2002 Constant *ConstantExpr::getExtractValue(Constant *Agg,
2003 ArrayRef<unsigned> Idxs) {
2004 assert(Agg->getType()->isFirstClassType() &&
2005 "Tried to create extractelement operation on non-first-class type!");
2007 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
2009 assert(ReqTy && "extractvalue indices invalid!");
2011 assert(Agg->getType()->isFirstClassType() &&
2012 "Non-first-class type for constant extractvalue expression");
2013 if (Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs))
2016 Constant *ArgVec[] = { Agg };
2017 const ExprMapKeyType Key(Instruction::ExtractValue, ArgVec, 0, 0, Idxs);
2019 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
2020 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2023 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
2024 assert(C->getType()->isIntOrIntVectorTy() &&
2025 "Cannot NEG a nonintegral value!");
2026 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
2030 Constant *ConstantExpr::getFNeg(Constant *C) {
2031 assert(C->getType()->isFPOrFPVectorTy() &&
2032 "Cannot FNEG a non-floating-point value!");
2033 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
2036 Constant *ConstantExpr::getNot(Constant *C) {
2037 assert(C->getType()->isIntOrIntVectorTy() &&
2038 "Cannot NOT a nonintegral value!");
2039 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
2042 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
2043 bool HasNUW, bool HasNSW) {
2044 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2045 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2046 return get(Instruction::Add, C1, C2, Flags);
2049 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
2050 return get(Instruction::FAdd, C1, C2);
2053 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
2054 bool HasNUW, bool HasNSW) {
2055 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2056 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2057 return get(Instruction::Sub, C1, C2, Flags);
2060 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
2061 return get(Instruction::FSub, C1, C2);
2064 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
2065 bool HasNUW, bool HasNSW) {
2066 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2067 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2068 return get(Instruction::Mul, C1, C2, Flags);
2071 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
2072 return get(Instruction::FMul, C1, C2);
2075 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
2076 return get(Instruction::UDiv, C1, C2,
2077 isExact ? PossiblyExactOperator::IsExact : 0);
2080 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
2081 return get(Instruction::SDiv, C1, C2,
2082 isExact ? PossiblyExactOperator::IsExact : 0);
2085 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
2086 return get(Instruction::FDiv, C1, C2);
2089 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
2090 return get(Instruction::URem, C1, C2);
2093 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
2094 return get(Instruction::SRem, C1, C2);
2097 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
2098 return get(Instruction::FRem, C1, C2);
2101 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
2102 return get(Instruction::And, C1, C2);
2105 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
2106 return get(Instruction::Or, C1, C2);
2109 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
2110 return get(Instruction::Xor, C1, C2);
2113 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
2114 bool HasNUW, bool HasNSW) {
2115 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2116 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2117 return get(Instruction::Shl, C1, C2, Flags);
2120 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2121 return get(Instruction::LShr, C1, C2,
2122 isExact ? PossiblyExactOperator::IsExact : 0);
2125 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2126 return get(Instruction::AShr, C1, C2,
2127 isExact ? PossiblyExactOperator::IsExact : 0);
2130 /// getBinOpIdentity - Return the identity for the given binary operation,
2131 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2132 /// returns null if the operator doesn't have an identity.
2133 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2136 // Doesn't have an identity.
2139 case Instruction::Add:
2140 case Instruction::Or:
2141 case Instruction::Xor:
2142 return Constant::getNullValue(Ty);
2144 case Instruction::Mul:
2145 return ConstantInt::get(Ty, 1);
2147 case Instruction::And:
2148 return Constant::getAllOnesValue(Ty);
2152 /// getBinOpAbsorber - Return the absorbing element for the given binary
2153 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2154 /// every X. For example, this returns zero for integer multiplication.
2155 /// It returns null if the operator doesn't have an absorbing element.
2156 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2159 // Doesn't have an absorber.
2162 case Instruction::Or:
2163 return Constant::getAllOnesValue(Ty);
2165 case Instruction::And:
2166 case Instruction::Mul:
2167 return Constant::getNullValue(Ty);
2171 // destroyConstant - Remove the constant from the constant table...
2173 void ConstantExpr::destroyConstant() {
2174 getType()->getContext().pImpl->ExprConstants.remove(this);
2175 destroyConstantImpl();
2178 const char *ConstantExpr::getOpcodeName() const {
2179 return Instruction::getOpcodeName(getOpcode());
2184 GetElementPtrConstantExpr::
2185 GetElementPtrConstantExpr(Constant *C, ArrayRef<Constant*> IdxList,
2187 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2188 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2189 - (IdxList.size()+1), IdxList.size()+1) {
2191 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2192 OperandList[i+1] = IdxList[i];
2195 //===----------------------------------------------------------------------===//
2196 // ConstantData* implementations
2198 void ConstantDataArray::anchor() {}
2199 void ConstantDataVector::anchor() {}
2201 /// getElementType - Return the element type of the array/vector.
2202 Type *ConstantDataSequential::getElementType() const {
2203 return getType()->getElementType();
2206 StringRef ConstantDataSequential::getRawDataValues() const {
2207 return StringRef(DataElements, getNumElements()*getElementByteSize());
2210 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2211 /// formed with a vector or array of the specified element type.
2212 /// ConstantDataArray only works with normal float and int types that are
2213 /// stored densely in memory, not with things like i42 or x86_f80.
2214 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2215 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2216 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2217 switch (IT->getBitWidth()) {
2229 /// getNumElements - Return the number of elements in the array or vector.
2230 unsigned ConstantDataSequential::getNumElements() const {
2231 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2232 return AT->getNumElements();
2233 return getType()->getVectorNumElements();
2237 /// getElementByteSize - Return the size in bytes of the elements in the data.
2238 uint64_t ConstantDataSequential::getElementByteSize() const {
2239 return getElementType()->getPrimitiveSizeInBits()/8;
2242 /// getElementPointer - Return the start of the specified element.
2243 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2244 assert(Elt < getNumElements() && "Invalid Elt");
2245 return DataElements+Elt*getElementByteSize();
2249 /// isAllZeros - return true if the array is empty or all zeros.
2250 static bool isAllZeros(StringRef Arr) {
2251 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2257 /// getImpl - This is the underlying implementation of all of the
2258 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2259 /// the correct element type. We take the bytes in as a StringRef because
2260 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2261 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2262 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2263 // If the elements are all zero or there are no elements, return a CAZ, which
2264 // is more dense and canonical.
2265 if (isAllZeros(Elements))
2266 return ConstantAggregateZero::get(Ty);
2268 // Do a lookup to see if we have already formed one of these.
2269 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2270 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2272 // The bucket can point to a linked list of different CDS's that have the same
2273 // body but different types. For example, 0,0,0,1 could be a 4 element array
2274 // of i8, or a 1-element array of i32. They'll both end up in the same
2275 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2276 ConstantDataSequential **Entry = &Slot.getValue();
2277 for (ConstantDataSequential *Node = *Entry; Node != 0;
2278 Entry = &Node->Next, Node = *Entry)
2279 if (Node->getType() == Ty)
2282 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2284 if (isa<ArrayType>(Ty))
2285 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2287 assert(isa<VectorType>(Ty));
2288 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2291 void ConstantDataSequential::destroyConstant() {
2292 // Remove the constant from the StringMap.
2293 StringMap<ConstantDataSequential*> &CDSConstants =
2294 getType()->getContext().pImpl->CDSConstants;
2296 StringMap<ConstantDataSequential*>::iterator Slot =
2297 CDSConstants.find(getRawDataValues());
2299 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2301 ConstantDataSequential **Entry = &Slot->getValue();
2303 // Remove the entry from the hash table.
2304 if ((*Entry)->Next == 0) {
2305 // If there is only one value in the bucket (common case) it must be this
2306 // entry, and removing the entry should remove the bucket completely.
2307 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2308 getContext().pImpl->CDSConstants.erase(Slot);
2310 // Otherwise, there are multiple entries linked off the bucket, unlink the
2311 // node we care about but keep the bucket around.
2312 for (ConstantDataSequential *Node = *Entry; ;
2313 Entry = &Node->Next, Node = *Entry) {
2314 assert(Node && "Didn't find entry in its uniquing hash table!");
2315 // If we found our entry, unlink it from the list and we're done.
2317 *Entry = Node->Next;
2323 // If we were part of a list, make sure that we don't delete the list that is
2324 // still owned by the uniquing map.
2327 // Finally, actually delete it.
2328 destroyConstantImpl();
2331 /// get() constructors - Return a constant with array type with an element
2332 /// count and element type matching the ArrayRef passed in. Note that this
2333 /// can return a ConstantAggregateZero object.
2334 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2335 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2336 const char *Data = reinterpret_cast<const char *>(Elts.data());
2337 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2339 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2340 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2341 const char *Data = reinterpret_cast<const char *>(Elts.data());
2342 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2344 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2345 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2346 const char *Data = reinterpret_cast<const char *>(Elts.data());
2347 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2349 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2350 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2351 const char *Data = reinterpret_cast<const char *>(Elts.data());
2352 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2354 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2355 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2356 const char *Data = reinterpret_cast<const char *>(Elts.data());
2357 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2359 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2360 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2361 const char *Data = reinterpret_cast<const char *>(Elts.data());
2362 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2365 /// getString - This method constructs a CDS and initializes it with a text
2366 /// string. The default behavior (AddNull==true) causes a null terminator to
2367 /// be placed at the end of the array (increasing the length of the string by
2368 /// one more than the StringRef would normally indicate. Pass AddNull=false
2369 /// to disable this behavior.
2370 Constant *ConstantDataArray::getString(LLVMContext &Context,
2371 StringRef Str, bool AddNull) {
2373 const uint8_t *Data = reinterpret_cast<const uint8_t *>(Str.data());
2374 return get(Context, ArrayRef<uint8_t>(const_cast<uint8_t *>(Data),
2378 SmallVector<uint8_t, 64> ElementVals;
2379 ElementVals.append(Str.begin(), Str.end());
2380 ElementVals.push_back(0);
2381 return get(Context, ElementVals);
2384 /// get() constructors - Return a constant with vector type with an element
2385 /// count and element type matching the ArrayRef passed in. Note that this
2386 /// can return a ConstantAggregateZero object.
2387 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2388 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2389 const char *Data = reinterpret_cast<const char *>(Elts.data());
2390 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2392 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2393 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2394 const char *Data = reinterpret_cast<const char *>(Elts.data());
2395 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2397 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2398 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2399 const char *Data = reinterpret_cast<const char *>(Elts.data());
2400 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2402 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2403 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2404 const char *Data = reinterpret_cast<const char *>(Elts.data());
2405 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2407 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2408 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2409 const char *Data = reinterpret_cast<const char *>(Elts.data());
2410 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2412 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2413 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2414 const char *Data = reinterpret_cast<const char *>(Elts.data());
2415 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2418 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2419 assert(isElementTypeCompatible(V->getType()) &&
2420 "Element type not compatible with ConstantData");
2421 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2422 if (CI->getType()->isIntegerTy(8)) {
2423 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2424 return get(V->getContext(), Elts);
2426 if (CI->getType()->isIntegerTy(16)) {
2427 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2428 return get(V->getContext(), Elts);
2430 if (CI->getType()->isIntegerTy(32)) {
2431 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2432 return get(V->getContext(), Elts);
2434 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2435 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2436 return get(V->getContext(), Elts);
2439 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2440 if (CFP->getType()->isFloatTy()) {
2441 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2442 return get(V->getContext(), Elts);
2444 if (CFP->getType()->isDoubleTy()) {
2445 SmallVector<double, 16> Elts(NumElts,
2446 CFP->getValueAPF().convertToDouble());
2447 return get(V->getContext(), Elts);
2450 return ConstantVector::getSplat(NumElts, V);
2454 /// getElementAsInteger - If this is a sequential container of integers (of
2455 /// any size), return the specified element in the low bits of a uint64_t.
2456 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2457 assert(isa<IntegerType>(getElementType()) &&
2458 "Accessor can only be used when element is an integer");
2459 const char *EltPtr = getElementPointer(Elt);
2461 // The data is stored in host byte order, make sure to cast back to the right
2462 // type to load with the right endianness.
2463 switch (getElementType()->getIntegerBitWidth()) {
2464 default: llvm_unreachable("Invalid bitwidth for CDS");
2466 return *const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(EltPtr));
2468 return *const_cast<uint16_t *>(reinterpret_cast<const uint16_t *>(EltPtr));
2470 return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(EltPtr));
2472 return *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(EltPtr));
2476 /// getElementAsAPFloat - If this is a sequential container of floating point
2477 /// type, return the specified element as an APFloat.
2478 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2479 const char *EltPtr = getElementPointer(Elt);
2481 switch (getElementType()->getTypeID()) {
2483 llvm_unreachable("Accessor can only be used when element is float/double!");
2484 case Type::FloatTyID: {
2485 const float *FloatPrt = reinterpret_cast<const float *>(EltPtr);
2486 return APFloat(*const_cast<float *>(FloatPrt));
2488 case Type::DoubleTyID: {
2489 const double *DoublePtr = reinterpret_cast<const double *>(EltPtr);
2490 return APFloat(*const_cast<double *>(DoublePtr));
2495 /// getElementAsFloat - If this is an sequential container of floats, return
2496 /// the specified element as a float.
2497 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2498 assert(getElementType()->isFloatTy() &&
2499 "Accessor can only be used when element is a 'float'");
2500 const float *EltPtr = reinterpret_cast<const float *>(getElementPointer(Elt));
2501 return *const_cast<float *>(EltPtr);
2504 /// getElementAsDouble - If this is an sequential container of doubles, return
2505 /// the specified element as a float.
2506 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2507 assert(getElementType()->isDoubleTy() &&
2508 "Accessor can only be used when element is a 'float'");
2509 const double *EltPtr =
2510 reinterpret_cast<const double *>(getElementPointer(Elt));
2511 return *const_cast<double *>(EltPtr);
2514 /// getElementAsConstant - Return a Constant for a specified index's element.
2515 /// Note that this has to compute a new constant to return, so it isn't as
2516 /// efficient as getElementAsInteger/Float/Double.
2517 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2518 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2519 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2521 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2524 /// isString - This method returns true if this is an array of i8.
2525 bool ConstantDataSequential::isString() const {
2526 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2529 /// isCString - This method returns true if the array "isString", ends with a
2530 /// nul byte, and does not contains any other nul bytes.
2531 bool ConstantDataSequential::isCString() const {
2535 StringRef Str = getAsString();
2537 // The last value must be nul.
2538 if (Str.back() != 0) return false;
2540 // Other elements must be non-nul.
2541 return Str.drop_back().find(0) == StringRef::npos;
2544 /// getSplatValue - If this is a splat constant, meaning that all of the
2545 /// elements have the same value, return that value. Otherwise return NULL.
2546 Constant *ConstantDataVector::getSplatValue() const {
2547 const char *Base = getRawDataValues().data();
2549 // Compare elements 1+ to the 0'th element.
2550 unsigned EltSize = getElementByteSize();
2551 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2552 if (memcmp(Base, Base+i*EltSize, EltSize))
2555 // If they're all the same, return the 0th one as a representative.
2556 return getElementAsConstant(0);
2559 //===----------------------------------------------------------------------===//
2560 // replaceUsesOfWithOnConstant implementations
2562 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2563 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2566 /// Note that we intentionally replace all uses of From with To here. Consider
2567 /// a large array that uses 'From' 1000 times. By handling this case all here,
2568 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2569 /// single invocation handles all 1000 uses. Handling them one at a time would
2570 /// work, but would be really slow because it would have to unique each updated
2573 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2575 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2576 Constant *ToC = cast<Constant>(To);
2578 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2580 SmallVector<Constant*, 8> Values;
2581 LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
2582 Lookup.first = cast<ArrayType>(getType());
2583 Values.reserve(getNumOperands()); // Build replacement array.
2585 // Fill values with the modified operands of the constant array. Also,
2586 // compute whether this turns into an all-zeros array.
2587 unsigned NumUpdated = 0;
2589 // Keep track of whether all the values in the array are "ToC".
2590 bool AllSame = true;
2591 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2592 Constant *Val = cast<Constant>(O->get());
2597 Values.push_back(Val);
2598 AllSame &= Val == ToC;
2601 Constant *Replacement = 0;
2602 if (AllSame && ToC->isNullValue()) {
2603 Replacement = ConstantAggregateZero::get(getType());
2604 } else if (AllSame && isa<UndefValue>(ToC)) {
2605 Replacement = UndefValue::get(getType());
2607 // Check to see if we have this array type already.
2608 Lookup.second = makeArrayRef(Values);
2609 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2610 pImpl->ArrayConstants.find(Lookup);
2612 if (I != pImpl->ArrayConstants.map_end()) {
2613 Replacement = I->first;
2615 // Okay, the new shape doesn't exist in the system yet. Instead of
2616 // creating a new constant array, inserting it, replaceallusesof'ing the
2617 // old with the new, then deleting the old... just update the current one
2619 pImpl->ArrayConstants.remove(this);
2621 // Update to the new value. Optimize for the case when we have a single
2622 // operand that we're changing, but handle bulk updates efficiently.
2623 if (NumUpdated == 1) {
2624 unsigned OperandToUpdate = U - OperandList;
2625 assert(getOperand(OperandToUpdate) == From &&
2626 "ReplaceAllUsesWith broken!");
2627 setOperand(OperandToUpdate, ToC);
2629 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2630 if (getOperand(i) == From)
2633 pImpl->ArrayConstants.insert(this);
2638 // Otherwise, I do need to replace this with an existing value.
2639 assert(Replacement != this && "I didn't contain From!");
2641 // Everyone using this now uses the replacement.
2642 replaceAllUsesWith(Replacement);
2644 // Delete the old constant!
2648 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2650 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2651 Constant *ToC = cast<Constant>(To);
2653 unsigned OperandToUpdate = U-OperandList;
2654 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2656 SmallVector<Constant*, 8> Values;
2657 LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
2658 Lookup.first = cast<StructType>(getType());
2659 Values.reserve(getNumOperands()); // Build replacement struct.
2661 // Fill values with the modified operands of the constant struct. Also,
2662 // compute whether this turns into an all-zeros struct.
2663 bool isAllZeros = false;
2664 bool isAllUndef = false;
2665 if (ToC->isNullValue()) {
2667 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2668 Constant *Val = cast<Constant>(O->get());
2669 Values.push_back(Val);
2670 if (isAllZeros) isAllZeros = Val->isNullValue();
2672 } else if (isa<UndefValue>(ToC)) {
2674 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2675 Constant *Val = cast<Constant>(O->get());
2676 Values.push_back(Val);
2677 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2680 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2681 Values.push_back(cast<Constant>(O->get()));
2683 Values[OperandToUpdate] = ToC;
2685 LLVMContextImpl *pImpl = getContext().pImpl;
2687 Constant *Replacement = 0;
2689 Replacement = ConstantAggregateZero::get(getType());
2690 } else if (isAllUndef) {
2691 Replacement = UndefValue::get(getType());
2693 // Check to see if we have this struct type already.
2694 Lookup.second = makeArrayRef(Values);
2695 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2696 pImpl->StructConstants.find(Lookup);
2698 if (I != pImpl->StructConstants.map_end()) {
2699 Replacement = I->first;
2701 // Okay, the new shape doesn't exist in the system yet. Instead of
2702 // creating a new constant struct, inserting it, replaceallusesof'ing the
2703 // old with the new, then deleting the old... just update the current one
2705 pImpl->StructConstants.remove(this);
2707 // Update to the new value.
2708 setOperand(OperandToUpdate, ToC);
2709 pImpl->StructConstants.insert(this);
2714 assert(Replacement != this && "I didn't contain From!");
2716 // Everyone using this now uses the replacement.
2717 replaceAllUsesWith(Replacement);
2719 // Delete the old constant!
2723 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2725 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2727 SmallVector<Constant*, 8> Values;
2728 Values.reserve(getNumOperands()); // Build replacement array...
2729 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2730 Constant *Val = getOperand(i);
2731 if (Val == From) Val = cast<Constant>(To);
2732 Values.push_back(Val);
2735 Constant *Replacement = get(Values);
2736 assert(Replacement != this && "I didn't contain From!");
2738 // Everyone using this now uses the replacement.
2739 replaceAllUsesWith(Replacement);
2741 // Delete the old constant!
2745 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2747 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2748 Constant *To = cast<Constant>(ToV);
2750 SmallVector<Constant*, 8> NewOps;
2751 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2752 Constant *Op = getOperand(i);
2753 NewOps.push_back(Op == From ? To : Op);
2756 Constant *Replacement = getWithOperands(NewOps);
2757 assert(Replacement != this && "I didn't contain From!");
2759 // Everyone using this now uses the replacement.
2760 replaceAllUsesWith(Replacement);
2762 // Delete the old constant!
2766 Instruction *ConstantExpr::getAsInstruction() {
2767 SmallVector<Value*,4> ValueOperands;
2768 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
2769 ValueOperands.push_back(cast<Value>(I));
2771 ArrayRef<Value*> Ops(ValueOperands);
2773 switch (getOpcode()) {
2774 case Instruction::Trunc:
2775 case Instruction::ZExt:
2776 case Instruction::SExt:
2777 case Instruction::FPTrunc:
2778 case Instruction::FPExt:
2779 case Instruction::UIToFP:
2780 case Instruction::SIToFP:
2781 case Instruction::FPToUI:
2782 case Instruction::FPToSI:
2783 case Instruction::PtrToInt:
2784 case Instruction::IntToPtr:
2785 case Instruction::BitCast:
2786 return CastInst::Create((Instruction::CastOps)getOpcode(),
2788 case Instruction::Select:
2789 return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
2790 case Instruction::InsertElement:
2791 return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
2792 case Instruction::ExtractElement:
2793 return ExtractElementInst::Create(Ops[0], Ops[1]);
2794 case Instruction::InsertValue:
2795 return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
2796 case Instruction::ExtractValue:
2797 return ExtractValueInst::Create(Ops[0], getIndices());
2798 case Instruction::ShuffleVector:
2799 return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
2801 case Instruction::GetElementPtr:
2802 if (cast<GEPOperator>(this)->isInBounds())
2803 return GetElementPtrInst::CreateInBounds(Ops[0], Ops.slice(1));
2805 return GetElementPtrInst::Create(Ops[0], Ops.slice(1));
2807 case Instruction::ICmp:
2808 case Instruction::FCmp:
2809 return CmpInst::Create((Instruction::OtherOps)getOpcode(),
2810 getPredicate(), Ops[0], Ops[1]);
2813 assert(getNumOperands() == 2 && "Must be binary operator?");
2814 BinaryOperator *BO =
2815 BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
2817 if (isa<OverflowingBinaryOperator>(BO)) {
2818 BO->setHasNoUnsignedWrap(SubclassOptionalData &
2819 OverflowingBinaryOperator::NoUnsignedWrap);
2820 BO->setHasNoSignedWrap(SubclassOptionalData &
2821 OverflowingBinaryOperator::NoSignedWrap);
2823 if (isa<PossiblyExactOperator>(BO))
2824 BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);