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/GetElementPtrTypeIterator.h"
25 #include "llvm/IR/GlobalValue.h"
26 #include "llvm/IR/Instructions.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/IR/Operator.h"
29 #include "llvm/Support/Compiler.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/ErrorHandling.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 = user_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() || user_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 User *U : users()) {
311 const Constant *UC = dyn_cast<Constant>(U);
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->user_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_user_iterator I = user_begin(), E = user_end();
397 Value::const_user_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 = std::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);
1378 BlockAddress *BlockAddress::lookup(const BasicBlock *BB) {
1379 if (!BB->hasAddressTaken())
1382 const Function *F = BB->getParent();
1383 assert(F != 0 && "Block must have a parent");
1385 F->getContext().pImpl->BlockAddresses.lookup(std::make_pair(F, BB));
1386 assert(BA && "Refcount and block address map disagree!");
1390 // destroyConstant - Remove the constant from the constant table.
1392 void BlockAddress::destroyConstant() {
1393 getFunction()->getType()->getContext().pImpl
1394 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1395 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1396 destroyConstantImpl();
1399 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1400 // This could be replacing either the Basic Block or the Function. In either
1401 // case, we have to remove the map entry.
1402 Function *NewF = getFunction();
1403 BasicBlock *NewBB = getBasicBlock();
1406 NewF = cast<Function>(To->stripPointerCasts());
1408 NewBB = cast<BasicBlock>(To);
1410 // See if the 'new' entry already exists, if not, just update this in place
1411 // and return early.
1412 BlockAddress *&NewBA =
1413 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1415 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1417 // Remove the old entry, this can't cause the map to rehash (just a
1418 // tombstone will get added).
1419 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1422 setOperand(0, NewF);
1423 setOperand(1, NewBB);
1424 getBasicBlock()->AdjustBlockAddressRefCount(1);
1428 // Otherwise, I do need to replace this with an existing value.
1429 assert(NewBA != this && "I didn't contain From!");
1431 // Everyone using this now uses the replacement.
1432 replaceAllUsesWith(NewBA);
1437 //---- ConstantExpr::get() implementations.
1440 /// This is a utility function to handle folding of casts and lookup of the
1441 /// cast in the ExprConstants map. It is used by the various get* methods below.
1442 static inline Constant *getFoldedCast(
1443 Instruction::CastOps opc, Constant *C, Type *Ty) {
1444 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1445 // Fold a few common cases
1446 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1449 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1451 // Look up the constant in the table first to ensure uniqueness.
1452 ExprMapKeyType Key(opc, C);
1454 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1457 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1458 Instruction::CastOps opc = Instruction::CastOps(oc);
1459 assert(Instruction::isCast(opc) && "opcode out of range");
1460 assert(C && Ty && "Null arguments to getCast");
1461 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1465 llvm_unreachable("Invalid cast opcode");
1466 case Instruction::Trunc: return getTrunc(C, Ty);
1467 case Instruction::ZExt: return getZExt(C, Ty);
1468 case Instruction::SExt: return getSExt(C, Ty);
1469 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1470 case Instruction::FPExt: return getFPExtend(C, Ty);
1471 case Instruction::UIToFP: return getUIToFP(C, Ty);
1472 case Instruction::SIToFP: return getSIToFP(C, Ty);
1473 case Instruction::FPToUI: return getFPToUI(C, Ty);
1474 case Instruction::FPToSI: return getFPToSI(C, Ty);
1475 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1476 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1477 case Instruction::BitCast: return getBitCast(C, Ty);
1478 case Instruction::AddrSpaceCast: return getAddrSpaceCast(C, Ty);
1482 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1483 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1484 return getBitCast(C, Ty);
1485 return getZExt(C, Ty);
1488 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1489 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1490 return getBitCast(C, Ty);
1491 return getSExt(C, Ty);
1494 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1495 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1496 return getBitCast(C, Ty);
1497 return getTrunc(C, Ty);
1500 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1501 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1502 assert((Ty->isIntOrIntVectorTy() || Ty->isPtrOrPtrVectorTy()) &&
1505 if (Ty->isIntOrIntVectorTy())
1506 return getPtrToInt(S, Ty);
1508 unsigned SrcAS = S->getType()->getPointerAddressSpace();
1509 if (Ty->isPtrOrPtrVectorTy() && SrcAS != Ty->getPointerAddressSpace())
1510 return getAddrSpaceCast(S, Ty);
1512 return getBitCast(S, Ty);
1515 Constant *ConstantExpr::getPointerBitCastOrAddrSpaceCast(Constant *S,
1517 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1518 assert(Ty->isPtrOrPtrVectorTy() && "Invalid cast");
1520 if (S->getType()->getPointerAddressSpace() != Ty->getPointerAddressSpace())
1521 return getAddrSpaceCast(S, Ty);
1523 return getBitCast(S, Ty);
1526 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1528 assert(C->getType()->isIntOrIntVectorTy() &&
1529 Ty->isIntOrIntVectorTy() && "Invalid cast");
1530 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1531 unsigned DstBits = Ty->getScalarSizeInBits();
1532 Instruction::CastOps opcode =
1533 (SrcBits == DstBits ? Instruction::BitCast :
1534 (SrcBits > DstBits ? Instruction::Trunc :
1535 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1536 return getCast(opcode, C, Ty);
1539 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1540 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1542 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1543 unsigned DstBits = Ty->getScalarSizeInBits();
1544 if (SrcBits == DstBits)
1545 return C; // Avoid a useless cast
1546 Instruction::CastOps opcode =
1547 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1548 return getCast(opcode, C, Ty);
1551 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1553 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1554 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1556 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1557 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1558 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1559 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1560 "SrcTy must be larger than DestTy for Trunc!");
1562 return getFoldedCast(Instruction::Trunc, C, Ty);
1565 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1567 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1568 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1570 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1571 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1572 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1573 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1574 "SrcTy must be smaller than DestTy for SExt!");
1576 return getFoldedCast(Instruction::SExt, C, Ty);
1579 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1581 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1582 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1584 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1585 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1586 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1587 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1588 "SrcTy must be smaller than DestTy for ZExt!");
1590 return getFoldedCast(Instruction::ZExt, C, Ty);
1593 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1595 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1596 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1598 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1599 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1600 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1601 "This is an illegal floating point truncation!");
1602 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1605 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1607 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1608 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1610 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1611 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1612 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1613 "This is an illegal floating point extension!");
1614 return getFoldedCast(Instruction::FPExt, C, Ty);
1617 Constant *ConstantExpr::getUIToFP(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 uint to floating point cast!");
1625 return getFoldedCast(Instruction::UIToFP, C, Ty);
1628 Constant *ConstantExpr::getSIToFP(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()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1635 "This is an illegal sint to floating point cast!");
1636 return getFoldedCast(Instruction::SIToFP, C, Ty);
1639 Constant *ConstantExpr::getFPToUI(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 uint cast!");
1647 return getFoldedCast(Instruction::FPToUI, C, Ty);
1650 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1652 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1653 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1655 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1656 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1657 "This is an illegal floating point to sint cast!");
1658 return getFoldedCast(Instruction::FPToSI, C, Ty);
1661 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1662 assert(C->getType()->getScalarType()->isPointerTy() &&
1663 "PtrToInt source must be pointer or pointer vector");
1664 assert(DstTy->getScalarType()->isIntegerTy() &&
1665 "PtrToInt destination must be integer or integer vector");
1666 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1667 if (isa<VectorType>(C->getType()))
1668 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1669 "Invalid cast between a different number of vector elements");
1670 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1673 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1674 assert(C->getType()->getScalarType()->isIntegerTy() &&
1675 "IntToPtr source must be integer or integer vector");
1676 assert(DstTy->getScalarType()->isPointerTy() &&
1677 "IntToPtr destination must be a pointer or pointer vector");
1678 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1679 if (isa<VectorType>(C->getType()))
1680 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1681 "Invalid cast between a different number of vector elements");
1682 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1685 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1686 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1687 "Invalid constantexpr bitcast!");
1689 // It is common to ask for a bitcast of a value to its own type, handle this
1691 if (C->getType() == DstTy) return C;
1693 return getFoldedCast(Instruction::BitCast, C, DstTy);
1696 Constant *ConstantExpr::getAddrSpaceCast(Constant *C, Type *DstTy) {
1697 assert(CastInst::castIsValid(Instruction::AddrSpaceCast, C, DstTy) &&
1698 "Invalid constantexpr addrspacecast!");
1700 return getFoldedCast(Instruction::AddrSpaceCast, C, DstTy);
1703 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1705 // Check the operands for consistency first.
1706 assert(Opcode >= Instruction::BinaryOpsBegin &&
1707 Opcode < Instruction::BinaryOpsEnd &&
1708 "Invalid opcode in binary constant expression");
1709 assert(C1->getType() == C2->getType() &&
1710 "Operand types in binary constant expression should match");
1714 case Instruction::Add:
1715 case Instruction::Sub:
1716 case Instruction::Mul:
1717 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1718 assert(C1->getType()->isIntOrIntVectorTy() &&
1719 "Tried to create an integer operation on a non-integer type!");
1721 case Instruction::FAdd:
1722 case Instruction::FSub:
1723 case Instruction::FMul:
1724 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1725 assert(C1->getType()->isFPOrFPVectorTy() &&
1726 "Tried to create a floating-point operation on a "
1727 "non-floating-point type!");
1729 case Instruction::UDiv:
1730 case Instruction::SDiv:
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::FDiv:
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::URem:
1741 case Instruction::SRem:
1742 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1743 assert(C1->getType()->isIntOrIntVectorTy() &&
1744 "Tried to create an arithmetic operation on a non-arithmetic type!");
1746 case Instruction::FRem:
1747 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1748 assert(C1->getType()->isFPOrFPVectorTy() &&
1749 "Tried to create an arithmetic operation on a non-arithmetic type!");
1751 case Instruction::And:
1752 case Instruction::Or:
1753 case Instruction::Xor:
1754 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1755 assert(C1->getType()->isIntOrIntVectorTy() &&
1756 "Tried to create a logical operation on a non-integral type!");
1758 case Instruction::Shl:
1759 case Instruction::LShr:
1760 case Instruction::AShr:
1761 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1762 assert(C1->getType()->isIntOrIntVectorTy() &&
1763 "Tried to create a shift operation on a non-integer type!");
1770 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1771 return FC; // Fold a few common cases.
1773 Constant *ArgVec[] = { C1, C2 };
1774 ExprMapKeyType Key(Opcode, ArgVec, 0, Flags);
1776 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1777 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1780 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1781 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1782 // Note that a non-inbounds gep is used, as null isn't within any object.
1783 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1784 Constant *GEP = getGetElementPtr(
1785 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1786 return getPtrToInt(GEP,
1787 Type::getInt64Ty(Ty->getContext()));
1790 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1791 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1792 // Note that a non-inbounds gep is used, as null isn't within any object.
1794 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1795 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1796 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1797 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1798 Constant *Indices[2] = { Zero, One };
1799 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1800 return getPtrToInt(GEP,
1801 Type::getInt64Ty(Ty->getContext()));
1804 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1805 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1809 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1810 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1811 // Note that a non-inbounds gep is used, as null isn't within any object.
1812 Constant *GEPIdx[] = {
1813 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1816 Constant *GEP = getGetElementPtr(
1817 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1818 return getPtrToInt(GEP,
1819 Type::getInt64Ty(Ty->getContext()));
1822 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1823 Constant *C1, Constant *C2) {
1824 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1826 switch (Predicate) {
1827 default: llvm_unreachable("Invalid CmpInst predicate");
1828 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1829 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1830 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1831 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1832 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1833 case CmpInst::FCMP_TRUE:
1834 return getFCmp(Predicate, C1, C2);
1836 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1837 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1838 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1839 case CmpInst::ICMP_SLE:
1840 return getICmp(Predicate, C1, C2);
1844 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1845 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1847 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1848 return SC; // Fold common cases
1850 Constant *ArgVec[] = { C, V1, V2 };
1851 ExprMapKeyType Key(Instruction::Select, ArgVec);
1853 LLVMContextImpl *pImpl = C->getContext().pImpl;
1854 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1857 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1859 assert(C->getType()->isPtrOrPtrVectorTy() &&
1860 "Non-pointer type for constant GetElementPtr expression");
1862 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1863 return FC; // Fold a few common cases.
1865 // Get the result type of the getelementptr!
1866 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1867 assert(Ty && "GEP indices invalid!");
1868 unsigned AS = C->getType()->getPointerAddressSpace();
1869 Type *ReqTy = Ty->getPointerTo(AS);
1870 if (VectorType *VecTy = dyn_cast<VectorType>(C->getType()))
1871 ReqTy = VectorType::get(ReqTy, VecTy->getNumElements());
1873 // Look up the constant in the table first to ensure uniqueness
1874 std::vector<Constant*> ArgVec;
1875 ArgVec.reserve(1 + Idxs.size());
1876 ArgVec.push_back(C);
1877 for (unsigned i = 0, e = Idxs.size(); i != e; ++i) {
1878 assert(Idxs[i]->getType()->isVectorTy() == ReqTy->isVectorTy() &&
1879 "getelementptr index type missmatch");
1880 assert((!Idxs[i]->getType()->isVectorTy() ||
1881 ReqTy->getVectorNumElements() ==
1882 Idxs[i]->getType()->getVectorNumElements()) &&
1883 "getelementptr index type missmatch");
1884 ArgVec.push_back(cast<Constant>(Idxs[i]));
1886 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1887 InBounds ? GEPOperator::IsInBounds : 0);
1889 LLVMContextImpl *pImpl = C->getContext().pImpl;
1890 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1894 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1895 assert(LHS->getType() == RHS->getType());
1896 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1897 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1899 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1900 return FC; // Fold a few common cases...
1902 // Look up the constant in the table first to ensure uniqueness
1903 Constant *ArgVec[] = { LHS, RHS };
1904 // Get the key type with both the opcode and predicate
1905 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1907 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1908 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1909 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1911 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1912 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1916 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1917 assert(LHS->getType() == RHS->getType());
1918 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1920 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1921 return FC; // Fold a few common cases...
1923 // Look up the constant in the table first to ensure uniqueness
1924 Constant *ArgVec[] = { LHS, RHS };
1925 // Get the key type with both the opcode and predicate
1926 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1928 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1929 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1930 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1932 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1933 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1936 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1937 assert(Val->getType()->isVectorTy() &&
1938 "Tried to create extractelement operation on non-vector type!");
1939 assert(Idx->getType()->isIntegerTy(32) &&
1940 "Extractelement index must be i32 type!");
1942 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1943 return FC; // Fold a few common cases.
1945 // Look up the constant in the table first to ensure uniqueness
1946 Constant *ArgVec[] = { Val, Idx };
1947 const ExprMapKeyType Key(Instruction::ExtractElement, ArgVec);
1949 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1950 Type *ReqTy = Val->getType()->getVectorElementType();
1951 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1954 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1956 assert(Val->getType()->isVectorTy() &&
1957 "Tried to create insertelement operation on non-vector type!");
1958 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1959 "Insertelement types must match!");
1960 assert(Idx->getType()->isIntegerTy(32) &&
1961 "Insertelement index must be i32 type!");
1963 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1964 return FC; // Fold a few common cases.
1965 // Look up the constant in the table first to ensure uniqueness
1966 Constant *ArgVec[] = { Val, Elt, Idx };
1967 const ExprMapKeyType Key(Instruction::InsertElement, ArgVec);
1969 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1970 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1973 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1975 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1976 "Invalid shuffle vector constant expr operands!");
1978 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1979 return FC; // Fold a few common cases.
1981 unsigned NElts = Mask->getType()->getVectorNumElements();
1982 Type *EltTy = V1->getType()->getVectorElementType();
1983 Type *ShufTy = VectorType::get(EltTy, NElts);
1985 // Look up the constant in the table first to ensure uniqueness
1986 Constant *ArgVec[] = { V1, V2, Mask };
1987 const ExprMapKeyType Key(Instruction::ShuffleVector, ArgVec);
1989 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1990 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1993 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1994 ArrayRef<unsigned> Idxs) {
1995 assert(Agg->getType()->isFirstClassType() &&
1996 "Non-first-class type for constant insertvalue expression");
1998 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1999 Idxs) == Val->getType() &&
2000 "insertvalue indices invalid!");
2001 Type *ReqTy = Val->getType();
2003 if (Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs))
2006 Constant *ArgVec[] = { Agg, Val };
2007 const ExprMapKeyType Key(Instruction::InsertValue, ArgVec, 0, 0, Idxs);
2009 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
2010 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2013 Constant *ConstantExpr::getExtractValue(Constant *Agg,
2014 ArrayRef<unsigned> Idxs) {
2015 assert(Agg->getType()->isFirstClassType() &&
2016 "Tried to create extractelement operation on non-first-class type!");
2018 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
2020 assert(ReqTy && "extractvalue indices invalid!");
2022 assert(Agg->getType()->isFirstClassType() &&
2023 "Non-first-class type for constant extractvalue expression");
2024 if (Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs))
2027 Constant *ArgVec[] = { Agg };
2028 const ExprMapKeyType Key(Instruction::ExtractValue, ArgVec, 0, 0, Idxs);
2030 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
2031 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2034 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
2035 assert(C->getType()->isIntOrIntVectorTy() &&
2036 "Cannot NEG a nonintegral value!");
2037 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
2041 Constant *ConstantExpr::getFNeg(Constant *C) {
2042 assert(C->getType()->isFPOrFPVectorTy() &&
2043 "Cannot FNEG a non-floating-point value!");
2044 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
2047 Constant *ConstantExpr::getNot(Constant *C) {
2048 assert(C->getType()->isIntOrIntVectorTy() &&
2049 "Cannot NOT a nonintegral value!");
2050 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
2053 Constant *ConstantExpr::getAdd(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::Add, C1, C2, Flags);
2060 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
2061 return get(Instruction::FAdd, C1, C2);
2064 Constant *ConstantExpr::getSub(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::Sub, C1, C2, Flags);
2071 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
2072 return get(Instruction::FSub, C1, C2);
2075 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
2076 bool HasNUW, bool HasNSW) {
2077 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2078 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2079 return get(Instruction::Mul, C1, C2, Flags);
2082 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
2083 return get(Instruction::FMul, C1, C2);
2086 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
2087 return get(Instruction::UDiv, C1, C2,
2088 isExact ? PossiblyExactOperator::IsExact : 0);
2091 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
2092 return get(Instruction::SDiv, C1, C2,
2093 isExact ? PossiblyExactOperator::IsExact : 0);
2096 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
2097 return get(Instruction::FDiv, C1, C2);
2100 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
2101 return get(Instruction::URem, C1, C2);
2104 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
2105 return get(Instruction::SRem, C1, C2);
2108 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
2109 return get(Instruction::FRem, C1, C2);
2112 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
2113 return get(Instruction::And, C1, C2);
2116 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
2117 return get(Instruction::Or, C1, C2);
2120 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
2121 return get(Instruction::Xor, C1, C2);
2124 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
2125 bool HasNUW, bool HasNSW) {
2126 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2127 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2128 return get(Instruction::Shl, C1, C2, Flags);
2131 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2132 return get(Instruction::LShr, C1, C2,
2133 isExact ? PossiblyExactOperator::IsExact : 0);
2136 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2137 return get(Instruction::AShr, C1, C2,
2138 isExact ? PossiblyExactOperator::IsExact : 0);
2141 /// getBinOpIdentity - Return the identity for the given binary operation,
2142 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2143 /// returns null if the operator doesn't have an identity.
2144 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2147 // Doesn't have an identity.
2150 case Instruction::Add:
2151 case Instruction::Or:
2152 case Instruction::Xor:
2153 return Constant::getNullValue(Ty);
2155 case Instruction::Mul:
2156 return ConstantInt::get(Ty, 1);
2158 case Instruction::And:
2159 return Constant::getAllOnesValue(Ty);
2163 /// getBinOpAbsorber - Return the absorbing element for the given binary
2164 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2165 /// every X. For example, this returns zero for integer multiplication.
2166 /// It returns null if the operator doesn't have an absorbing element.
2167 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2170 // Doesn't have an absorber.
2173 case Instruction::Or:
2174 return Constant::getAllOnesValue(Ty);
2176 case Instruction::And:
2177 case Instruction::Mul:
2178 return Constant::getNullValue(Ty);
2182 // destroyConstant - Remove the constant from the constant table...
2184 void ConstantExpr::destroyConstant() {
2185 getType()->getContext().pImpl->ExprConstants.remove(this);
2186 destroyConstantImpl();
2189 const char *ConstantExpr::getOpcodeName() const {
2190 return Instruction::getOpcodeName(getOpcode());
2195 GetElementPtrConstantExpr::
2196 GetElementPtrConstantExpr(Constant *C, ArrayRef<Constant*> IdxList,
2198 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2199 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2200 - (IdxList.size()+1), IdxList.size()+1) {
2202 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2203 OperandList[i+1] = IdxList[i];
2206 //===----------------------------------------------------------------------===//
2207 // ConstantData* implementations
2209 void ConstantDataArray::anchor() {}
2210 void ConstantDataVector::anchor() {}
2212 /// getElementType - Return the element type of the array/vector.
2213 Type *ConstantDataSequential::getElementType() const {
2214 return getType()->getElementType();
2217 StringRef ConstantDataSequential::getRawDataValues() const {
2218 return StringRef(DataElements, getNumElements()*getElementByteSize());
2221 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2222 /// formed with a vector or array of the specified element type.
2223 /// ConstantDataArray only works with normal float and int types that are
2224 /// stored densely in memory, not with things like i42 or x86_f80.
2225 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2226 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2227 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2228 switch (IT->getBitWidth()) {
2240 /// getNumElements - Return the number of elements in the array or vector.
2241 unsigned ConstantDataSequential::getNumElements() const {
2242 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2243 return AT->getNumElements();
2244 return getType()->getVectorNumElements();
2248 /// getElementByteSize - Return the size in bytes of the elements in the data.
2249 uint64_t ConstantDataSequential::getElementByteSize() const {
2250 return getElementType()->getPrimitiveSizeInBits()/8;
2253 /// getElementPointer - Return the start of the specified element.
2254 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2255 assert(Elt < getNumElements() && "Invalid Elt");
2256 return DataElements+Elt*getElementByteSize();
2260 /// isAllZeros - return true if the array is empty or all zeros.
2261 static bool isAllZeros(StringRef Arr) {
2262 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2268 /// getImpl - This is the underlying implementation of all of the
2269 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2270 /// the correct element type. We take the bytes in as a StringRef because
2271 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2272 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2273 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2274 // If the elements are all zero or there are no elements, return a CAZ, which
2275 // is more dense and canonical.
2276 if (isAllZeros(Elements))
2277 return ConstantAggregateZero::get(Ty);
2279 // Do a lookup to see if we have already formed one of these.
2280 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2281 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2283 // The bucket can point to a linked list of different CDS's that have the same
2284 // body but different types. For example, 0,0,0,1 could be a 4 element array
2285 // of i8, or a 1-element array of i32. They'll both end up in the same
2286 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2287 ConstantDataSequential **Entry = &Slot.getValue();
2288 for (ConstantDataSequential *Node = *Entry; Node != 0;
2289 Entry = &Node->Next, Node = *Entry)
2290 if (Node->getType() == Ty)
2293 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2295 if (isa<ArrayType>(Ty))
2296 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2298 assert(isa<VectorType>(Ty));
2299 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2302 void ConstantDataSequential::destroyConstant() {
2303 // Remove the constant from the StringMap.
2304 StringMap<ConstantDataSequential*> &CDSConstants =
2305 getType()->getContext().pImpl->CDSConstants;
2307 StringMap<ConstantDataSequential*>::iterator Slot =
2308 CDSConstants.find(getRawDataValues());
2310 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2312 ConstantDataSequential **Entry = &Slot->getValue();
2314 // Remove the entry from the hash table.
2315 if ((*Entry)->Next == 0) {
2316 // If there is only one value in the bucket (common case) it must be this
2317 // entry, and removing the entry should remove the bucket completely.
2318 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2319 getContext().pImpl->CDSConstants.erase(Slot);
2321 // Otherwise, there are multiple entries linked off the bucket, unlink the
2322 // node we care about but keep the bucket around.
2323 for (ConstantDataSequential *Node = *Entry; ;
2324 Entry = &Node->Next, Node = *Entry) {
2325 assert(Node && "Didn't find entry in its uniquing hash table!");
2326 // If we found our entry, unlink it from the list and we're done.
2328 *Entry = Node->Next;
2334 // If we were part of a list, make sure that we don't delete the list that is
2335 // still owned by the uniquing map.
2338 // Finally, actually delete it.
2339 destroyConstantImpl();
2342 /// get() constructors - Return a constant with array type with an element
2343 /// count and element type matching the ArrayRef passed in. Note that this
2344 /// can return a ConstantAggregateZero object.
2345 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2346 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2347 const char *Data = reinterpret_cast<const char *>(Elts.data());
2348 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2350 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2351 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2352 const char *Data = reinterpret_cast<const char *>(Elts.data());
2353 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2355 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2356 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2357 const char *Data = reinterpret_cast<const char *>(Elts.data());
2358 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2360 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2361 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2362 const char *Data = reinterpret_cast<const char *>(Elts.data());
2363 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2365 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2366 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2367 const char *Data = reinterpret_cast<const char *>(Elts.data());
2368 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2370 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2371 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2372 const char *Data = reinterpret_cast<const char *>(Elts.data());
2373 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2376 /// getString - This method constructs a CDS and initializes it with a text
2377 /// string. The default behavior (AddNull==true) causes a null terminator to
2378 /// be placed at the end of the array (increasing the length of the string by
2379 /// one more than the StringRef would normally indicate. Pass AddNull=false
2380 /// to disable this behavior.
2381 Constant *ConstantDataArray::getString(LLVMContext &Context,
2382 StringRef Str, bool AddNull) {
2384 const uint8_t *Data = reinterpret_cast<const uint8_t *>(Str.data());
2385 return get(Context, ArrayRef<uint8_t>(const_cast<uint8_t *>(Data),
2389 SmallVector<uint8_t, 64> ElementVals;
2390 ElementVals.append(Str.begin(), Str.end());
2391 ElementVals.push_back(0);
2392 return get(Context, ElementVals);
2395 /// get() constructors - Return a constant with vector type with an element
2396 /// count and element type matching the ArrayRef passed in. Note that this
2397 /// can return a ConstantAggregateZero object.
2398 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2399 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2400 const char *Data = reinterpret_cast<const char *>(Elts.data());
2401 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2403 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2404 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2405 const char *Data = reinterpret_cast<const char *>(Elts.data());
2406 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2408 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2409 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2410 const char *Data = reinterpret_cast<const char *>(Elts.data());
2411 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2413 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2414 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2415 const char *Data = reinterpret_cast<const char *>(Elts.data());
2416 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2418 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2419 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2420 const char *Data = reinterpret_cast<const char *>(Elts.data());
2421 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2423 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2424 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2425 const char *Data = reinterpret_cast<const char *>(Elts.data());
2426 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2429 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2430 assert(isElementTypeCompatible(V->getType()) &&
2431 "Element type not compatible with ConstantData");
2432 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2433 if (CI->getType()->isIntegerTy(8)) {
2434 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2435 return get(V->getContext(), Elts);
2437 if (CI->getType()->isIntegerTy(16)) {
2438 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2439 return get(V->getContext(), Elts);
2441 if (CI->getType()->isIntegerTy(32)) {
2442 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2443 return get(V->getContext(), Elts);
2445 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2446 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2447 return get(V->getContext(), Elts);
2450 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2451 if (CFP->getType()->isFloatTy()) {
2452 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2453 return get(V->getContext(), Elts);
2455 if (CFP->getType()->isDoubleTy()) {
2456 SmallVector<double, 16> Elts(NumElts,
2457 CFP->getValueAPF().convertToDouble());
2458 return get(V->getContext(), Elts);
2461 return ConstantVector::getSplat(NumElts, V);
2465 /// getElementAsInteger - If this is a sequential container of integers (of
2466 /// any size), return the specified element in the low bits of a uint64_t.
2467 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2468 assert(isa<IntegerType>(getElementType()) &&
2469 "Accessor can only be used when element is an integer");
2470 const char *EltPtr = getElementPointer(Elt);
2472 // The data is stored in host byte order, make sure to cast back to the right
2473 // type to load with the right endianness.
2474 switch (getElementType()->getIntegerBitWidth()) {
2475 default: llvm_unreachable("Invalid bitwidth for CDS");
2477 return *const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(EltPtr));
2479 return *const_cast<uint16_t *>(reinterpret_cast<const uint16_t *>(EltPtr));
2481 return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(EltPtr));
2483 return *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(EltPtr));
2487 /// getElementAsAPFloat - If this is a sequential container of floating point
2488 /// type, return the specified element as an APFloat.
2489 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2490 const char *EltPtr = getElementPointer(Elt);
2492 switch (getElementType()->getTypeID()) {
2494 llvm_unreachable("Accessor can only be used when element is float/double!");
2495 case Type::FloatTyID: {
2496 const float *FloatPrt = reinterpret_cast<const float *>(EltPtr);
2497 return APFloat(*const_cast<float *>(FloatPrt));
2499 case Type::DoubleTyID: {
2500 const double *DoublePtr = reinterpret_cast<const double *>(EltPtr);
2501 return APFloat(*const_cast<double *>(DoublePtr));
2506 /// getElementAsFloat - If this is an sequential container of floats, return
2507 /// the specified element as a float.
2508 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2509 assert(getElementType()->isFloatTy() &&
2510 "Accessor can only be used when element is a 'float'");
2511 const float *EltPtr = reinterpret_cast<const float *>(getElementPointer(Elt));
2512 return *const_cast<float *>(EltPtr);
2515 /// getElementAsDouble - If this is an sequential container of doubles, return
2516 /// the specified element as a float.
2517 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2518 assert(getElementType()->isDoubleTy() &&
2519 "Accessor can only be used when element is a 'float'");
2520 const double *EltPtr =
2521 reinterpret_cast<const double *>(getElementPointer(Elt));
2522 return *const_cast<double *>(EltPtr);
2525 /// getElementAsConstant - Return a Constant for a specified index's element.
2526 /// Note that this has to compute a new constant to return, so it isn't as
2527 /// efficient as getElementAsInteger/Float/Double.
2528 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2529 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2530 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2532 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2535 /// isString - This method returns true if this is an array of i8.
2536 bool ConstantDataSequential::isString() const {
2537 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2540 /// isCString - This method returns true if the array "isString", ends with a
2541 /// nul byte, and does not contains any other nul bytes.
2542 bool ConstantDataSequential::isCString() const {
2546 StringRef Str = getAsString();
2548 // The last value must be nul.
2549 if (Str.back() != 0) return false;
2551 // Other elements must be non-nul.
2552 return Str.drop_back().find(0) == StringRef::npos;
2555 /// getSplatValue - If this is a splat constant, meaning that all of the
2556 /// elements have the same value, return that value. Otherwise return NULL.
2557 Constant *ConstantDataVector::getSplatValue() const {
2558 const char *Base = getRawDataValues().data();
2560 // Compare elements 1+ to the 0'th element.
2561 unsigned EltSize = getElementByteSize();
2562 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2563 if (memcmp(Base, Base+i*EltSize, EltSize))
2566 // If they're all the same, return the 0th one as a representative.
2567 return getElementAsConstant(0);
2570 //===----------------------------------------------------------------------===//
2571 // replaceUsesOfWithOnConstant implementations
2573 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2574 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2577 /// Note that we intentionally replace all uses of From with To here. Consider
2578 /// a large array that uses 'From' 1000 times. By handling this case all here,
2579 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2580 /// single invocation handles all 1000 uses. Handling them one at a time would
2581 /// work, but would be really slow because it would have to unique each updated
2584 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2586 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2587 Constant *ToC = cast<Constant>(To);
2589 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2591 SmallVector<Constant*, 8> Values;
2592 LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
2593 Lookup.first = cast<ArrayType>(getType());
2594 Values.reserve(getNumOperands()); // Build replacement array.
2596 // Fill values with the modified operands of the constant array. Also,
2597 // compute whether this turns into an all-zeros array.
2598 unsigned NumUpdated = 0;
2600 // Keep track of whether all the values in the array are "ToC".
2601 bool AllSame = true;
2602 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2603 Constant *Val = cast<Constant>(O->get());
2608 Values.push_back(Val);
2609 AllSame &= Val == ToC;
2612 Constant *Replacement = 0;
2613 if (AllSame && ToC->isNullValue()) {
2614 Replacement = ConstantAggregateZero::get(getType());
2615 } else if (AllSame && isa<UndefValue>(ToC)) {
2616 Replacement = UndefValue::get(getType());
2618 // Check to see if we have this array type already.
2619 Lookup.second = makeArrayRef(Values);
2620 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2621 pImpl->ArrayConstants.find(Lookup);
2623 if (I != pImpl->ArrayConstants.map_end()) {
2624 Replacement = I->first;
2626 // Okay, the new shape doesn't exist in the system yet. Instead of
2627 // creating a new constant array, inserting it, replaceallusesof'ing the
2628 // old with the new, then deleting the old... just update the current one
2630 pImpl->ArrayConstants.remove(this);
2632 // Update to the new value. Optimize for the case when we have a single
2633 // operand that we're changing, but handle bulk updates efficiently.
2634 if (NumUpdated == 1) {
2635 unsigned OperandToUpdate = U - OperandList;
2636 assert(getOperand(OperandToUpdate) == From &&
2637 "ReplaceAllUsesWith broken!");
2638 setOperand(OperandToUpdate, ToC);
2640 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2641 if (getOperand(i) == From)
2644 pImpl->ArrayConstants.insert(this);
2649 // Otherwise, I do need to replace this with an existing value.
2650 assert(Replacement != this && "I didn't contain From!");
2652 // Everyone using this now uses the replacement.
2653 replaceAllUsesWith(Replacement);
2655 // Delete the old constant!
2659 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2661 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2662 Constant *ToC = cast<Constant>(To);
2664 unsigned OperandToUpdate = U-OperandList;
2665 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2667 SmallVector<Constant*, 8> Values;
2668 LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
2669 Lookup.first = cast<StructType>(getType());
2670 Values.reserve(getNumOperands()); // Build replacement struct.
2672 // Fill values with the modified operands of the constant struct. Also,
2673 // compute whether this turns into an all-zeros struct.
2674 bool isAllZeros = false;
2675 bool isAllUndef = false;
2676 if (ToC->isNullValue()) {
2678 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2679 Constant *Val = cast<Constant>(O->get());
2680 Values.push_back(Val);
2681 if (isAllZeros) isAllZeros = Val->isNullValue();
2683 } else if (isa<UndefValue>(ToC)) {
2685 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2686 Constant *Val = cast<Constant>(O->get());
2687 Values.push_back(Val);
2688 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2691 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2692 Values.push_back(cast<Constant>(O->get()));
2694 Values[OperandToUpdate] = ToC;
2696 LLVMContextImpl *pImpl = getContext().pImpl;
2698 Constant *Replacement = 0;
2700 Replacement = ConstantAggregateZero::get(getType());
2701 } else if (isAllUndef) {
2702 Replacement = UndefValue::get(getType());
2704 // Check to see if we have this struct type already.
2705 Lookup.second = makeArrayRef(Values);
2706 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2707 pImpl->StructConstants.find(Lookup);
2709 if (I != pImpl->StructConstants.map_end()) {
2710 Replacement = I->first;
2712 // Okay, the new shape doesn't exist in the system yet. Instead of
2713 // creating a new constant struct, inserting it, replaceallusesof'ing the
2714 // old with the new, then deleting the old... just update the current one
2716 pImpl->StructConstants.remove(this);
2718 // Update to the new value.
2719 setOperand(OperandToUpdate, ToC);
2720 pImpl->StructConstants.insert(this);
2725 assert(Replacement != this && "I didn't contain From!");
2727 // Everyone using this now uses the replacement.
2728 replaceAllUsesWith(Replacement);
2730 // Delete the old constant!
2734 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2736 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2738 SmallVector<Constant*, 8> Values;
2739 Values.reserve(getNumOperands()); // Build replacement array...
2740 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2741 Constant *Val = getOperand(i);
2742 if (Val == From) Val = cast<Constant>(To);
2743 Values.push_back(Val);
2746 Constant *Replacement = get(Values);
2747 assert(Replacement != this && "I didn't contain From!");
2749 // Everyone using this now uses the replacement.
2750 replaceAllUsesWith(Replacement);
2752 // Delete the old constant!
2756 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2758 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2759 Constant *To = cast<Constant>(ToV);
2761 SmallVector<Constant*, 8> NewOps;
2762 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2763 Constant *Op = getOperand(i);
2764 NewOps.push_back(Op == From ? To : Op);
2767 Constant *Replacement = getWithOperands(NewOps);
2768 assert(Replacement != this && "I didn't contain From!");
2770 // Everyone using this now uses the replacement.
2771 replaceAllUsesWith(Replacement);
2773 // Delete the old constant!
2777 Instruction *ConstantExpr::getAsInstruction() {
2778 SmallVector<Value*,4> ValueOperands;
2779 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
2780 ValueOperands.push_back(cast<Value>(I));
2782 ArrayRef<Value*> Ops(ValueOperands);
2784 switch (getOpcode()) {
2785 case Instruction::Trunc:
2786 case Instruction::ZExt:
2787 case Instruction::SExt:
2788 case Instruction::FPTrunc:
2789 case Instruction::FPExt:
2790 case Instruction::UIToFP:
2791 case Instruction::SIToFP:
2792 case Instruction::FPToUI:
2793 case Instruction::FPToSI:
2794 case Instruction::PtrToInt:
2795 case Instruction::IntToPtr:
2796 case Instruction::BitCast:
2797 case Instruction::AddrSpaceCast:
2798 return CastInst::Create((Instruction::CastOps)getOpcode(),
2800 case Instruction::Select:
2801 return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
2802 case Instruction::InsertElement:
2803 return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
2804 case Instruction::ExtractElement:
2805 return ExtractElementInst::Create(Ops[0], Ops[1]);
2806 case Instruction::InsertValue:
2807 return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
2808 case Instruction::ExtractValue:
2809 return ExtractValueInst::Create(Ops[0], getIndices());
2810 case Instruction::ShuffleVector:
2811 return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
2813 case Instruction::GetElementPtr:
2814 if (cast<GEPOperator>(this)->isInBounds())
2815 return GetElementPtrInst::CreateInBounds(Ops[0], Ops.slice(1));
2817 return GetElementPtrInst::Create(Ops[0], Ops.slice(1));
2819 case Instruction::ICmp:
2820 case Instruction::FCmp:
2821 return CmpInst::Create((Instruction::OtherOps)getOpcode(),
2822 getPredicate(), Ops[0], Ops[1]);
2825 assert(getNumOperands() == 2 && "Must be binary operator?");
2826 BinaryOperator *BO =
2827 BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
2829 if (isa<OverflowingBinaryOperator>(BO)) {
2830 BO->setHasNoUnsignedWrap(SubclassOptionalData &
2831 OverflowingBinaryOperator::NoUnsignedWrap);
2832 BO->setHasNoSignedWrap(SubclassOptionalData &
2833 OverflowingBinaryOperator::NoSignedWrap);
2835 if (isa<PossiblyExactOperator>(BO))
2836 BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);