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 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
57 if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue()))
58 if (SplatCFP && SplatCFP->isZero() && SplatCFP->isNegative())
61 // We've already handled true FP case; any other FP vectors can't represent -0.0.
62 if (getType()->isFPOrFPVectorTy())
65 // Otherwise, just use +0.0.
69 // Return true iff this constant is positive zero (floating point), negative
70 // zero (floating point), or a null value.
71 bool Constant::isZeroValue() const {
72 // Floating point values have an explicit -0.0 value.
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
76 // Equivalent for a vector of -0.0's.
77 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
78 if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue()))
79 if (SplatCFP && SplatCFP->isZero())
82 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
83 if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue()))
84 if (SplatCFP && SplatCFP->isZero())
87 // Otherwise, just use +0.0.
91 bool Constant::isNullValue() const {
93 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
97 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
98 return CFP->isZero() && !CFP->isNegative();
100 // constant zero is zero for aggregates, cpnull is null for pointers, none for
102 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this) ||
103 isa<ConstantTokenNone>(this);
106 bool Constant::isAllOnesValue() const {
107 // Check for -1 integers
108 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
109 return CI->isMinusOne();
111 // Check for FP which are bitcasted from -1 integers
112 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
113 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
115 // Check for constant vectors which are splats of -1 values.
116 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
117 if (Constant *Splat = CV->getSplatValue())
118 return Splat->isAllOnesValue();
120 // Check for constant vectors which are splats of -1 values.
121 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
122 if (Constant *Splat = CV->getSplatValue())
123 return Splat->isAllOnesValue();
128 bool Constant::isOneValue() const {
129 // Check for 1 integers
130 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
133 // Check for FP which are bitcasted from 1 integers
134 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
135 return CFP->getValueAPF().bitcastToAPInt() == 1;
137 // Check for constant vectors which are splats of 1 values.
138 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
139 if (Constant *Splat = CV->getSplatValue())
140 return Splat->isOneValue();
142 // Check for constant vectors which are splats of 1 values.
143 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
144 if (Constant *Splat = CV->getSplatValue())
145 return Splat->isOneValue();
150 bool Constant::isMinSignedValue() const {
151 // Check for INT_MIN integers
152 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
153 return CI->isMinValue(/*isSigned=*/true);
155 // Check for FP which are bitcasted from INT_MIN integers
156 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
157 return CFP->getValueAPF().bitcastToAPInt().isMinSignedValue();
159 // Check for constant vectors which are splats of INT_MIN values.
160 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
161 if (Constant *Splat = CV->getSplatValue())
162 return Splat->isMinSignedValue();
164 // Check for constant vectors which are splats of INT_MIN values.
165 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
166 if (Constant *Splat = CV->getSplatValue())
167 return Splat->isMinSignedValue();
172 bool Constant::isNotMinSignedValue() const {
173 // Check for INT_MIN integers
174 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
175 return !CI->isMinValue(/*isSigned=*/true);
177 // Check for FP which are bitcasted from INT_MIN integers
178 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
179 return !CFP->getValueAPF().bitcastToAPInt().isMinSignedValue();
181 // Check for constant vectors which are splats of INT_MIN values.
182 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
183 if (Constant *Splat = CV->getSplatValue())
184 return Splat->isNotMinSignedValue();
186 // Check for constant vectors which are splats of INT_MIN values.
187 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
188 if (Constant *Splat = CV->getSplatValue())
189 return Splat->isNotMinSignedValue();
191 // It *may* contain INT_MIN, we can't tell.
195 // Constructor to create a '0' constant of arbitrary type...
196 Constant *Constant::getNullValue(Type *Ty) {
197 switch (Ty->getTypeID()) {
198 case Type::IntegerTyID:
199 return ConstantInt::get(Ty, 0);
201 return ConstantFP::get(Ty->getContext(),
202 APFloat::getZero(APFloat::IEEEhalf));
203 case Type::FloatTyID:
204 return ConstantFP::get(Ty->getContext(),
205 APFloat::getZero(APFloat::IEEEsingle));
206 case Type::DoubleTyID:
207 return ConstantFP::get(Ty->getContext(),
208 APFloat::getZero(APFloat::IEEEdouble));
209 case Type::X86_FP80TyID:
210 return ConstantFP::get(Ty->getContext(),
211 APFloat::getZero(APFloat::x87DoubleExtended));
212 case Type::FP128TyID:
213 return ConstantFP::get(Ty->getContext(),
214 APFloat::getZero(APFloat::IEEEquad));
215 case Type::PPC_FP128TyID:
216 return ConstantFP::get(Ty->getContext(),
217 APFloat(APFloat::PPCDoubleDouble,
218 APInt::getNullValue(128)));
219 case Type::PointerTyID:
220 return ConstantPointerNull::get(cast<PointerType>(Ty));
221 case Type::StructTyID:
222 case Type::ArrayTyID:
223 case Type::VectorTyID:
224 return ConstantAggregateZero::get(Ty);
225 case Type::TokenTyID:
226 return ConstantTokenNone::get(Ty->getContext());
228 // Function, Label, or Opaque type?
229 llvm_unreachable("Cannot create a null constant of that type!");
233 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
234 Type *ScalarTy = Ty->getScalarType();
236 // Create the base integer constant.
237 Constant *C = ConstantInt::get(Ty->getContext(), V);
239 // Convert an integer to a pointer, if necessary.
240 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
241 C = ConstantExpr::getIntToPtr(C, PTy);
243 // Broadcast a scalar to a vector, if necessary.
244 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
245 C = ConstantVector::getSplat(VTy->getNumElements(), C);
250 Constant *Constant::getAllOnesValue(Type *Ty) {
251 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
252 return ConstantInt::get(Ty->getContext(),
253 APInt::getAllOnesValue(ITy->getBitWidth()));
255 if (Ty->isFloatingPointTy()) {
256 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
257 !Ty->isPPC_FP128Ty());
258 return ConstantFP::get(Ty->getContext(), FL);
261 VectorType *VTy = cast<VectorType>(Ty);
262 return ConstantVector::getSplat(VTy->getNumElements(),
263 getAllOnesValue(VTy->getElementType()));
266 /// getAggregateElement - For aggregates (struct/array/vector) return the
267 /// constant that corresponds to the specified element if possible, or null if
268 /// not. This can return null if the element index is a ConstantExpr, or if
269 /// 'this' is a constant expr.
270 Constant *Constant::getAggregateElement(unsigned Elt) const {
271 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
272 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : nullptr;
274 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
275 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : nullptr;
277 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
278 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : nullptr;
280 if (const ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(this))
281 return Elt < CAZ->getNumElements() ? CAZ->getElementValue(Elt) : nullptr;
283 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
284 return Elt < UV->getNumElements() ? UV->getElementValue(Elt) : nullptr;
286 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
287 return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt)
292 Constant *Constant::getAggregateElement(Constant *Elt) const {
293 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
294 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
295 return getAggregateElement(CI->getZExtValue());
299 void Constant::destroyConstant() {
300 /// First call destroyConstantImpl on the subclass. This gives the subclass
301 /// a chance to remove the constant from any maps/pools it's contained in.
302 switch (getValueID()) {
304 llvm_unreachable("Not a constant!");
305 #define HANDLE_CONSTANT(Name) \
306 case Value::Name##Val: \
307 cast<Name>(this)->destroyConstantImpl(); \
309 #include "llvm/IR/Value.def"
312 // When a Constant is destroyed, there may be lingering
313 // references to the constant by other constants in the constant pool. These
314 // constants are implicitly dependent on the module that is being deleted,
315 // but they don't know that. Because we only find out when the CPV is
316 // deleted, we must now notify all of our users (that should only be
317 // Constants) that they are, in fact, invalid now and should be deleted.
319 while (!use_empty()) {
320 Value *V = user_back();
321 #ifndef NDEBUG // Only in -g mode...
322 if (!isa<Constant>(V)) {
323 dbgs() << "While deleting: " << *this
324 << "\n\nUse still stuck around after Def is destroyed: " << *V
328 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
329 cast<Constant>(V)->destroyConstant();
331 // The constant should remove itself from our use list...
332 assert((use_empty() || user_back() != V) && "Constant not removed!");
335 // Value has no outstanding references it is safe to delete it now...
339 static bool canTrapImpl(const Constant *C,
340 SmallPtrSetImpl<const ConstantExpr *> &NonTrappingOps) {
341 assert(C->getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
342 // The only thing that could possibly trap are constant exprs.
343 const ConstantExpr *CE = dyn_cast<ConstantExpr>(C);
347 // ConstantExpr traps if any operands can trap.
348 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
349 if (ConstantExpr *Op = dyn_cast<ConstantExpr>(CE->getOperand(i))) {
350 if (NonTrappingOps.insert(Op).second && canTrapImpl(Op, NonTrappingOps))
355 // Otherwise, only specific operations can trap.
356 switch (CE->getOpcode()) {
359 case Instruction::UDiv:
360 case Instruction::SDiv:
361 case Instruction::FDiv:
362 case Instruction::URem:
363 case Instruction::SRem:
364 case Instruction::FRem:
365 // Div and rem can trap if the RHS is not known to be non-zero.
366 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
372 /// canTrap - Return true if evaluation of this constant could trap. This is
373 /// true for things like constant expressions that could divide by zero.
374 bool Constant::canTrap() const {
375 SmallPtrSet<const ConstantExpr *, 4> NonTrappingOps;
376 return canTrapImpl(this, NonTrappingOps);
379 /// Check if C contains a GlobalValue for which Predicate is true.
381 ConstHasGlobalValuePredicate(const Constant *C,
382 bool (*Predicate)(const GlobalValue *)) {
383 SmallPtrSet<const Constant *, 8> Visited;
384 SmallVector<const Constant *, 8> WorkList;
385 WorkList.push_back(C);
388 while (!WorkList.empty()) {
389 const Constant *WorkItem = WorkList.pop_back_val();
390 if (const auto *GV = dyn_cast<GlobalValue>(WorkItem))
393 for (const Value *Op : WorkItem->operands()) {
394 const Constant *ConstOp = dyn_cast<Constant>(Op);
397 if (Visited.insert(ConstOp).second)
398 WorkList.push_back(ConstOp);
404 /// Return true if the value can vary between threads.
405 bool Constant::isThreadDependent() const {
406 auto DLLImportPredicate = [](const GlobalValue *GV) {
407 return GV->isThreadLocal();
409 return ConstHasGlobalValuePredicate(this, DLLImportPredicate);
412 bool Constant::isDLLImportDependent() const {
413 auto DLLImportPredicate = [](const GlobalValue *GV) {
414 return GV->hasDLLImportStorageClass();
416 return ConstHasGlobalValuePredicate(this, DLLImportPredicate);
419 /// Return true if the constant has users other than constant exprs and other
421 bool Constant::isConstantUsed() const {
422 for (const User *U : users()) {
423 const Constant *UC = dyn_cast<Constant>(U);
424 if (!UC || isa<GlobalValue>(UC))
427 if (UC->isConstantUsed())
433 bool Constant::needsRelocation() const {
434 if (isa<GlobalValue>(this))
435 return true; // Global reference.
437 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
438 return BA->getFunction()->needsRelocation();
440 // While raw uses of blockaddress need to be relocated, differences between
441 // two of them don't when they are for labels in the same function. This is a
442 // common idiom when creating a table for the indirect goto extension, so we
443 // handle it efficiently here.
444 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
445 if (CE->getOpcode() == Instruction::Sub) {
446 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
447 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
448 if (LHS && RHS && LHS->getOpcode() == Instruction::PtrToInt &&
449 RHS->getOpcode() == Instruction::PtrToInt &&
450 isa<BlockAddress>(LHS->getOperand(0)) &&
451 isa<BlockAddress>(RHS->getOperand(0)) &&
452 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
453 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
458 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
459 Result |= cast<Constant>(getOperand(i))->needsRelocation();
464 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
465 /// it. This involves recursively eliminating any dead users of the
467 static bool removeDeadUsersOfConstant(const Constant *C) {
468 if (isa<GlobalValue>(C)) return false; // Cannot remove this
470 while (!C->use_empty()) {
471 const Constant *User = dyn_cast<Constant>(C->user_back());
472 if (!User) return false; // Non-constant usage;
473 if (!removeDeadUsersOfConstant(User))
474 return false; // Constant wasn't dead
477 const_cast<Constant*>(C)->destroyConstant();
482 /// removeDeadConstantUsers - If there are any dead constant users dangling
483 /// off of this constant, remove them. This method is useful for clients
484 /// that want to check to see if a global is unused, but don't want to deal
485 /// with potentially dead constants hanging off of the globals.
486 void Constant::removeDeadConstantUsers() const {
487 Value::const_user_iterator I = user_begin(), E = user_end();
488 Value::const_user_iterator LastNonDeadUser = E;
490 const Constant *User = dyn_cast<Constant>(*I);
497 if (!removeDeadUsersOfConstant(User)) {
498 // If the constant wasn't dead, remember that this was the last live use
499 // and move on to the next constant.
505 // If the constant was dead, then the iterator is invalidated.
506 if (LastNonDeadUser == E) {
518 //===----------------------------------------------------------------------===//
520 //===----------------------------------------------------------------------===//
522 void ConstantInt::anchor() { }
524 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
525 : Constant(Ty, ConstantIntVal, nullptr, 0), Val(V) {
526 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
529 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
530 LLVMContextImpl *pImpl = Context.pImpl;
531 if (!pImpl->TheTrueVal)
532 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
533 return pImpl->TheTrueVal;
536 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
537 LLVMContextImpl *pImpl = Context.pImpl;
538 if (!pImpl->TheFalseVal)
539 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
540 return pImpl->TheFalseVal;
543 Constant *ConstantInt::getTrue(Type *Ty) {
544 VectorType *VTy = dyn_cast<VectorType>(Ty);
546 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
547 return ConstantInt::getTrue(Ty->getContext());
549 assert(VTy->getElementType()->isIntegerTy(1) &&
550 "True must be vector of i1 or i1.");
551 return ConstantVector::getSplat(VTy->getNumElements(),
552 ConstantInt::getTrue(Ty->getContext()));
555 Constant *ConstantInt::getFalse(Type *Ty) {
556 VectorType *VTy = dyn_cast<VectorType>(Ty);
558 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
559 return ConstantInt::getFalse(Ty->getContext());
561 assert(VTy->getElementType()->isIntegerTy(1) &&
562 "False must be vector of i1 or i1.");
563 return ConstantVector::getSplat(VTy->getNumElements(),
564 ConstantInt::getFalse(Ty->getContext()));
567 // Get a ConstantInt from an APInt.
568 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
569 // get an existing value or the insertion position
570 LLVMContextImpl *pImpl = Context.pImpl;
571 ConstantInt *&Slot = pImpl->IntConstants[V];
573 // Get the corresponding integer type for the bit width of the value.
574 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
575 Slot = new ConstantInt(ITy, V);
577 assert(Slot->getType() == IntegerType::get(Context, V.getBitWidth()));
581 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
582 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
584 // For vectors, broadcast the value.
585 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
586 return ConstantVector::getSplat(VTy->getNumElements(), C);
591 ConstantInt *ConstantInt::get(IntegerType *Ty, uint64_t V,
593 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
596 ConstantInt *ConstantInt::getSigned(IntegerType *Ty, int64_t V) {
597 return get(Ty, V, true);
600 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
601 return get(Ty, V, true);
604 Constant *ConstantInt::get(Type *Ty, const APInt& V) {
605 ConstantInt *C = get(Ty->getContext(), V);
606 assert(C->getType() == Ty->getScalarType() &&
607 "ConstantInt type doesn't match the type implied by its value!");
609 // For vectors, broadcast the value.
610 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
611 return ConstantVector::getSplat(VTy->getNumElements(), C);
616 ConstantInt *ConstantInt::get(IntegerType* Ty, StringRef Str,
618 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
621 /// Remove the constant from the constant table.
622 void ConstantInt::destroyConstantImpl() {
623 llvm_unreachable("You can't ConstantInt->destroyConstantImpl()!");
626 //===----------------------------------------------------------------------===//
628 //===----------------------------------------------------------------------===//
630 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
632 return &APFloat::IEEEhalf;
634 return &APFloat::IEEEsingle;
635 if (Ty->isDoubleTy())
636 return &APFloat::IEEEdouble;
637 if (Ty->isX86_FP80Ty())
638 return &APFloat::x87DoubleExtended;
639 else if (Ty->isFP128Ty())
640 return &APFloat::IEEEquad;
642 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
643 return &APFloat::PPCDoubleDouble;
646 void ConstantFP::anchor() { }
648 /// get() - This returns a constant fp for the specified value in the
649 /// specified type. This should only be used for simple constant values like
650 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
651 Constant *ConstantFP::get(Type *Ty, double V) {
652 LLVMContext &Context = Ty->getContext();
656 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
657 APFloat::rmNearestTiesToEven, &ignored);
658 Constant *C = get(Context, FV);
660 // For vectors, broadcast the value.
661 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
662 return ConstantVector::getSplat(VTy->getNumElements(), C);
668 Constant *ConstantFP::get(Type *Ty, StringRef Str) {
669 LLVMContext &Context = Ty->getContext();
671 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
672 Constant *C = get(Context, FV);
674 // For vectors, broadcast the value.
675 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
676 return ConstantVector::getSplat(VTy->getNumElements(), C);
681 Constant *ConstantFP::getNaN(Type *Ty, bool Negative, unsigned Type) {
682 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
683 APFloat NaN = APFloat::getNaN(Semantics, Negative, Type);
684 Constant *C = get(Ty->getContext(), NaN);
686 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
687 return ConstantVector::getSplat(VTy->getNumElements(), C);
692 Constant *ConstantFP::getNegativeZero(Type *Ty) {
693 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
694 APFloat NegZero = APFloat::getZero(Semantics, /*Negative=*/true);
695 Constant *C = get(Ty->getContext(), NegZero);
697 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
698 return ConstantVector::getSplat(VTy->getNumElements(), C);
704 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
705 if (Ty->isFPOrFPVectorTy())
706 return getNegativeZero(Ty);
708 return Constant::getNullValue(Ty);
712 // ConstantFP accessors.
713 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
714 LLVMContextImpl* pImpl = Context.pImpl;
716 ConstantFP *&Slot = pImpl->FPConstants[V];
720 if (&V.getSemantics() == &APFloat::IEEEhalf)
721 Ty = Type::getHalfTy(Context);
722 else if (&V.getSemantics() == &APFloat::IEEEsingle)
723 Ty = Type::getFloatTy(Context);
724 else if (&V.getSemantics() == &APFloat::IEEEdouble)
725 Ty = Type::getDoubleTy(Context);
726 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
727 Ty = Type::getX86_FP80Ty(Context);
728 else if (&V.getSemantics() == &APFloat::IEEEquad)
729 Ty = Type::getFP128Ty(Context);
731 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
732 "Unknown FP format");
733 Ty = Type::getPPC_FP128Ty(Context);
735 Slot = new ConstantFP(Ty, V);
741 Constant *ConstantFP::getInfinity(Type *Ty, bool Negative) {
742 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
743 Constant *C = get(Ty->getContext(), APFloat::getInf(Semantics, Negative));
745 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
746 return ConstantVector::getSplat(VTy->getNumElements(), C);
751 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
752 : Constant(Ty, ConstantFPVal, nullptr, 0), Val(V) {
753 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
757 bool ConstantFP::isExactlyValue(const APFloat &V) const {
758 return Val.bitwiseIsEqual(V);
761 /// Remove the constant from the constant table.
762 void ConstantFP::destroyConstantImpl() {
763 llvm_unreachable("You can't ConstantInt->destroyConstantImpl()!");
766 //===----------------------------------------------------------------------===//
767 // ConstantAggregateZero Implementation
768 //===----------------------------------------------------------------------===//
770 /// getSequentialElement - If this CAZ has array or vector type, return a zero
771 /// with the right element type.
772 Constant *ConstantAggregateZero::getSequentialElement() const {
773 return Constant::getNullValue(getType()->getSequentialElementType());
776 /// getStructElement - If this CAZ has struct type, return a zero with the
777 /// right element type for the specified element.
778 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
779 return Constant::getNullValue(getType()->getStructElementType(Elt));
782 /// getElementValue - Return a zero of the right value for the specified GEP
783 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
784 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
785 if (isa<SequentialType>(getType()))
786 return getSequentialElement();
787 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
790 /// getElementValue - Return a zero of the right value for the specified GEP
792 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
793 if (isa<SequentialType>(getType()))
794 return getSequentialElement();
795 return getStructElement(Idx);
798 unsigned ConstantAggregateZero::getNumElements() const {
799 Type *Ty = getType();
800 if (auto *AT = dyn_cast<ArrayType>(Ty))
801 return AT->getNumElements();
802 if (auto *VT = dyn_cast<VectorType>(Ty))
803 return VT->getNumElements();
804 return Ty->getStructNumElements();
807 //===----------------------------------------------------------------------===//
808 // UndefValue Implementation
809 //===----------------------------------------------------------------------===//
811 /// getSequentialElement - If this undef has array or vector type, return an
812 /// undef with the right element type.
813 UndefValue *UndefValue::getSequentialElement() const {
814 return UndefValue::get(getType()->getSequentialElementType());
817 /// getStructElement - If this undef has struct type, return a zero with the
818 /// right element type for the specified element.
819 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
820 return UndefValue::get(getType()->getStructElementType(Elt));
823 /// getElementValue - Return an undef of the right value for the specified GEP
824 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
825 UndefValue *UndefValue::getElementValue(Constant *C) const {
826 if (isa<SequentialType>(getType()))
827 return getSequentialElement();
828 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
831 /// getElementValue - Return an undef of the right value for the specified GEP
833 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
834 if (isa<SequentialType>(getType()))
835 return getSequentialElement();
836 return getStructElement(Idx);
839 unsigned UndefValue::getNumElements() const {
840 Type *Ty = getType();
841 if (auto *AT = dyn_cast<ArrayType>(Ty))
842 return AT->getNumElements();
843 if (auto *VT = dyn_cast<VectorType>(Ty))
844 return VT->getNumElements();
845 return Ty->getStructNumElements();
848 //===----------------------------------------------------------------------===//
849 // ConstantXXX Classes
850 //===----------------------------------------------------------------------===//
852 template <typename ItTy, typename EltTy>
853 static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
854 for (; Start != End; ++Start)
860 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
861 : Constant(T, ConstantArrayVal,
862 OperandTraits<ConstantArray>::op_end(this) - V.size(),
864 assert(V.size() == T->getNumElements() &&
865 "Invalid initializer vector for constant array");
866 for (unsigned i = 0, e = V.size(); i != e; ++i)
867 assert(V[i]->getType() == T->getElementType() &&
868 "Initializer for array element doesn't match array element type!");
869 std::copy(V.begin(), V.end(), op_begin());
872 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
873 if (Constant *C = getImpl(Ty, V))
875 return Ty->getContext().pImpl->ArrayConstants.getOrCreate(Ty, V);
877 Constant *ConstantArray::getImpl(ArrayType *Ty, ArrayRef<Constant*> V) {
878 // Empty arrays are canonicalized to ConstantAggregateZero.
880 return ConstantAggregateZero::get(Ty);
882 for (unsigned i = 0, e = V.size(); i != e; ++i) {
883 assert(V[i]->getType() == Ty->getElementType() &&
884 "Wrong type in array element initializer");
887 // If this is an all-zero array, return a ConstantAggregateZero object. If
888 // all undef, return an UndefValue, if "all simple", then return a
889 // ConstantDataArray.
891 if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
892 return UndefValue::get(Ty);
894 if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
895 return ConstantAggregateZero::get(Ty);
897 // Check to see if all of the elements are ConstantFP or ConstantInt and if
898 // the element type is compatible with ConstantDataVector. If so, use it.
899 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
900 // We speculatively build the elements here even if it turns out that there
901 // is a constantexpr or something else weird in the array, since it is so
902 // uncommon for that to happen.
903 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
904 if (CI->getType()->isIntegerTy(8)) {
905 SmallVector<uint8_t, 16> Elts;
906 for (unsigned i = 0, e = V.size(); i != e; ++i)
907 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
908 Elts.push_back(CI->getZExtValue());
911 if (Elts.size() == V.size())
912 return ConstantDataArray::get(C->getContext(), Elts);
913 } else if (CI->getType()->isIntegerTy(16)) {
914 SmallVector<uint16_t, 16> Elts;
915 for (unsigned i = 0, e = V.size(); i != e; ++i)
916 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
917 Elts.push_back(CI->getZExtValue());
920 if (Elts.size() == V.size())
921 return ConstantDataArray::get(C->getContext(), Elts);
922 } else if (CI->getType()->isIntegerTy(32)) {
923 SmallVector<uint32_t, 16> Elts;
924 for (unsigned i = 0, e = V.size(); i != e; ++i)
925 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
926 Elts.push_back(CI->getZExtValue());
929 if (Elts.size() == V.size())
930 return ConstantDataArray::get(C->getContext(), Elts);
931 } else if (CI->getType()->isIntegerTy(64)) {
932 SmallVector<uint64_t, 16> Elts;
933 for (unsigned i = 0, e = V.size(); i != e; ++i)
934 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
935 Elts.push_back(CI->getZExtValue());
938 if (Elts.size() == V.size())
939 return ConstantDataArray::get(C->getContext(), Elts);
943 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
944 if (CFP->getType()->isFloatTy()) {
945 SmallVector<uint32_t, 16> Elts;
946 for (unsigned i = 0, e = V.size(); i != e; ++i)
947 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
949 CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
952 if (Elts.size() == V.size())
953 return ConstantDataArray::getFP(C->getContext(), Elts);
954 } else if (CFP->getType()->isDoubleTy()) {
955 SmallVector<uint64_t, 16> Elts;
956 for (unsigned i = 0, e = V.size(); i != e; ++i)
957 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
959 CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
962 if (Elts.size() == V.size())
963 return ConstantDataArray::getFP(C->getContext(), Elts);
968 // Otherwise, we really do want to create a ConstantArray.
972 /// getTypeForElements - Return an anonymous struct type to use for a constant
973 /// with the specified set of elements. The list must not be empty.
974 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
975 ArrayRef<Constant*> V,
977 unsigned VecSize = V.size();
978 SmallVector<Type*, 16> EltTypes(VecSize);
979 for (unsigned i = 0; i != VecSize; ++i)
980 EltTypes[i] = V[i]->getType();
982 return StructType::get(Context, EltTypes, Packed);
986 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
989 "ConstantStruct::getTypeForElements cannot be called on empty list");
990 return getTypeForElements(V[0]->getContext(), V, Packed);
994 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
995 : Constant(T, ConstantStructVal,
996 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
998 assert(V.size() == T->getNumElements() &&
999 "Invalid initializer vector for constant structure");
1000 for (unsigned i = 0, e = V.size(); i != e; ++i)
1001 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
1002 "Initializer for struct element doesn't match struct element type!");
1003 std::copy(V.begin(), V.end(), op_begin());
1006 // ConstantStruct accessors.
1007 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
1008 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
1009 "Incorrect # elements specified to ConstantStruct::get");
1011 // Create a ConstantAggregateZero value if all elements are zeros.
1013 bool isUndef = false;
1016 isUndef = isa<UndefValue>(V[0]);
1017 isZero = V[0]->isNullValue();
1018 if (isUndef || isZero) {
1019 for (unsigned i = 0, e = V.size(); i != e; ++i) {
1020 if (!V[i]->isNullValue())
1022 if (!isa<UndefValue>(V[i]))
1028 return ConstantAggregateZero::get(ST);
1030 return UndefValue::get(ST);
1032 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
1035 Constant *ConstantStruct::get(StructType *T, ...) {
1037 SmallVector<Constant*, 8> Values;
1039 while (Constant *Val = va_arg(ap, llvm::Constant*))
1040 Values.push_back(Val);
1042 return get(T, Values);
1045 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
1046 : Constant(T, ConstantVectorVal,
1047 OperandTraits<ConstantVector>::op_end(this) - V.size(),
1049 for (size_t i = 0, e = V.size(); i != e; i++)
1050 assert(V[i]->getType() == T->getElementType() &&
1051 "Initializer for vector element doesn't match vector element type!");
1052 std::copy(V.begin(), V.end(), op_begin());
1055 // ConstantVector accessors.
1056 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
1057 if (Constant *C = getImpl(V))
1059 VectorType *Ty = VectorType::get(V.front()->getType(), V.size());
1060 return Ty->getContext().pImpl->VectorConstants.getOrCreate(Ty, V);
1062 Constant *ConstantVector::getImpl(ArrayRef<Constant*> V) {
1063 assert(!V.empty() && "Vectors can't be empty");
1064 VectorType *T = VectorType::get(V.front()->getType(), V.size());
1066 // If this is an all-undef or all-zero vector, return a
1067 // ConstantAggregateZero or UndefValue.
1069 bool isZero = C->isNullValue();
1070 bool isUndef = isa<UndefValue>(C);
1072 if (isZero || isUndef) {
1073 for (unsigned i = 1, e = V.size(); i != e; ++i)
1075 isZero = isUndef = false;
1081 return ConstantAggregateZero::get(T);
1083 return UndefValue::get(T);
1085 // Check to see if all of the elements are ConstantFP or ConstantInt and if
1086 // the element type is compatible with ConstantDataVector. If so, use it.
1087 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
1088 // We speculatively build the elements here even if it turns out that there
1089 // is a constantexpr or something else weird in the array, since it is so
1090 // uncommon for that to happen.
1091 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
1092 if (CI->getType()->isIntegerTy(8)) {
1093 SmallVector<uint8_t, 16> Elts;
1094 for (unsigned i = 0, e = V.size(); i != e; ++i)
1095 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
1096 Elts.push_back(CI->getZExtValue());
1099 if (Elts.size() == V.size())
1100 return ConstantDataVector::get(C->getContext(), Elts);
1101 } else if (CI->getType()->isIntegerTy(16)) {
1102 SmallVector<uint16_t, 16> Elts;
1103 for (unsigned i = 0, e = V.size(); i != e; ++i)
1104 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
1105 Elts.push_back(CI->getZExtValue());
1108 if (Elts.size() == V.size())
1109 return ConstantDataVector::get(C->getContext(), Elts);
1110 } else if (CI->getType()->isIntegerTy(32)) {
1111 SmallVector<uint32_t, 16> Elts;
1112 for (unsigned i = 0, e = V.size(); i != e; ++i)
1113 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
1114 Elts.push_back(CI->getZExtValue());
1117 if (Elts.size() == V.size())
1118 return ConstantDataVector::get(C->getContext(), Elts);
1119 } else if (CI->getType()->isIntegerTy(64)) {
1120 SmallVector<uint64_t, 16> Elts;
1121 for (unsigned i = 0, e = V.size(); i != e; ++i)
1122 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
1123 Elts.push_back(CI->getZExtValue());
1126 if (Elts.size() == V.size())
1127 return ConstantDataVector::get(C->getContext(), Elts);
1131 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
1132 if (CFP->getType()->isFloatTy()) {
1133 SmallVector<uint32_t, 16> Elts;
1134 for (unsigned i = 0, e = V.size(); i != e; ++i)
1135 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1137 CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
1140 if (Elts.size() == V.size())
1141 return ConstantDataVector::getFP(C->getContext(), Elts);
1142 } else if (CFP->getType()->isDoubleTy()) {
1143 SmallVector<uint64_t, 16> Elts;
1144 for (unsigned i = 0, e = V.size(); i != e; ++i)
1145 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1147 CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
1150 if (Elts.size() == V.size())
1151 return ConstantDataVector::getFP(C->getContext(), Elts);
1156 // Otherwise, the element type isn't compatible with ConstantDataVector, or
1157 // the operand list constants a ConstantExpr or something else strange.
1161 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
1162 // If this splat is compatible with ConstantDataVector, use it instead of
1164 if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
1165 ConstantDataSequential::isElementTypeCompatible(V->getType()))
1166 return ConstantDataVector::getSplat(NumElts, V);
1168 SmallVector<Constant*, 32> Elts(NumElts, V);
1172 ConstantTokenNone *ConstantTokenNone::get(LLVMContext &Context) {
1173 LLVMContextImpl *pImpl = Context.pImpl;
1174 if (!pImpl->TheNoneToken)
1175 pImpl->TheNoneToken.reset(new ConstantTokenNone(Context));
1176 return pImpl->TheNoneToken.get();
1179 /// Remove the constant from the constant table.
1180 void ConstantTokenNone::destroyConstantImpl() {
1181 llvm_unreachable("You can't ConstantTokenNone->destroyConstantImpl()!");
1184 // Utility function for determining if a ConstantExpr is a CastOp or not. This
1185 // can't be inline because we don't want to #include Instruction.h into
1187 bool ConstantExpr::isCast() const {
1188 return Instruction::isCast(getOpcode());
1191 bool ConstantExpr::isCompare() const {
1192 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
1195 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
1196 if (getOpcode() != Instruction::GetElementPtr) return false;
1198 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
1199 User::const_op_iterator OI = std::next(this->op_begin());
1201 // Skip the first index, as it has no static limit.
1205 // The remaining indices must be compile-time known integers within the
1206 // bounds of the corresponding notional static array types.
1207 for (; GEPI != E; ++GEPI, ++OI) {
1208 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
1209 if (!CI) return false;
1210 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
1211 if (CI->getValue().getActiveBits() > 64 ||
1212 CI->getZExtValue() >= ATy->getNumElements())
1216 // All the indices checked out.
1220 bool ConstantExpr::hasIndices() const {
1221 return getOpcode() == Instruction::ExtractValue ||
1222 getOpcode() == Instruction::InsertValue;
1225 ArrayRef<unsigned> ConstantExpr::getIndices() const {
1226 if (const ExtractValueConstantExpr *EVCE =
1227 dyn_cast<ExtractValueConstantExpr>(this))
1228 return EVCE->Indices;
1230 return cast<InsertValueConstantExpr>(this)->Indices;
1233 unsigned ConstantExpr::getPredicate() const {
1234 assert(isCompare());
1235 return ((const CompareConstantExpr*)this)->predicate;
1238 /// getWithOperandReplaced - Return a constant expression identical to this
1239 /// one, but with the specified operand set to the specified value.
1241 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
1242 assert(Op->getType() == getOperand(OpNo)->getType() &&
1243 "Replacing operand with value of different type!");
1244 if (getOperand(OpNo) == Op)
1245 return const_cast<ConstantExpr*>(this);
1247 SmallVector<Constant*, 8> NewOps;
1248 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1249 NewOps.push_back(i == OpNo ? Op : getOperand(i));
1251 return getWithOperands(NewOps);
1254 /// getWithOperands - This returns the current constant expression with the
1255 /// operands replaced with the specified values. The specified array must
1256 /// have the same number of operands as our current one.
1257 Constant *ConstantExpr::getWithOperands(ArrayRef<Constant *> Ops, Type *Ty,
1258 bool OnlyIfReduced, Type *SrcTy) const {
1259 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
1261 // If no operands changed return self.
1262 if (Ty == getType() && std::equal(Ops.begin(), Ops.end(), op_begin()))
1263 return const_cast<ConstantExpr*>(this);
1265 Type *OnlyIfReducedTy = OnlyIfReduced ? Ty : nullptr;
1266 switch (getOpcode()) {
1267 case Instruction::Trunc:
1268 case Instruction::ZExt:
1269 case Instruction::SExt:
1270 case Instruction::FPTrunc:
1271 case Instruction::FPExt:
1272 case Instruction::UIToFP:
1273 case Instruction::SIToFP:
1274 case Instruction::FPToUI:
1275 case Instruction::FPToSI:
1276 case Instruction::PtrToInt:
1277 case Instruction::IntToPtr:
1278 case Instruction::BitCast:
1279 case Instruction::AddrSpaceCast:
1280 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty, OnlyIfReduced);
1281 case Instruction::Select:
1282 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2], OnlyIfReducedTy);
1283 case Instruction::InsertElement:
1284 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2],
1286 case Instruction::ExtractElement:
1287 return ConstantExpr::getExtractElement(Ops[0], Ops[1], OnlyIfReducedTy);
1288 case Instruction::InsertValue:
1289 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices(),
1291 case Instruction::ExtractValue:
1292 return ConstantExpr::getExtractValue(Ops[0], getIndices(), OnlyIfReducedTy);
1293 case Instruction::ShuffleVector:
1294 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2],
1296 case Instruction::GetElementPtr: {
1297 auto *GEPO = cast<GEPOperator>(this);
1298 assert(SrcTy || (Ops[0]->getType() == getOperand(0)->getType()));
1299 return ConstantExpr::getGetElementPtr(
1300 SrcTy ? SrcTy : GEPO->getSourceElementType(), Ops[0], Ops.slice(1),
1301 GEPO->isInBounds(), OnlyIfReducedTy);
1303 case Instruction::ICmp:
1304 case Instruction::FCmp:
1305 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1],
1308 assert(getNumOperands() == 2 && "Must be binary operator?");
1309 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData,
1315 //===----------------------------------------------------------------------===//
1316 // isValueValidForType implementations
1318 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1319 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1320 if (Ty->isIntegerTy(1))
1321 return Val == 0 || Val == 1;
1323 return true; // always true, has to fit in largest type
1324 uint64_t Max = (1ll << NumBits) - 1;
1328 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1329 unsigned NumBits = Ty->getIntegerBitWidth();
1330 if (Ty->isIntegerTy(1))
1331 return Val == 0 || Val == 1 || Val == -1;
1333 return true; // always true, has to fit in largest type
1334 int64_t Min = -(1ll << (NumBits-1));
1335 int64_t Max = (1ll << (NumBits-1)) - 1;
1336 return (Val >= Min && Val <= Max);
1339 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1340 // convert modifies in place, so make a copy.
1341 APFloat Val2 = APFloat(Val);
1343 switch (Ty->getTypeID()) {
1345 return false; // These can't be represented as floating point!
1347 // FIXME rounding mode needs to be more flexible
1348 case Type::HalfTyID: {
1349 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1351 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1354 case Type::FloatTyID: {
1355 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1357 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1360 case Type::DoubleTyID: {
1361 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1362 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1363 &Val2.getSemantics() == &APFloat::IEEEdouble)
1365 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1368 case Type::X86_FP80TyID:
1369 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1370 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1371 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1372 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1373 case Type::FP128TyID:
1374 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1375 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1376 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1377 &Val2.getSemantics() == &APFloat::IEEEquad;
1378 case Type::PPC_FP128TyID:
1379 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1380 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1381 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1382 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1387 //===----------------------------------------------------------------------===//
1388 // Factory Function Implementation
1390 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1391 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1392 "Cannot create an aggregate zero of non-aggregate type!");
1394 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1396 Entry = new ConstantAggregateZero(Ty);
1401 /// destroyConstant - Remove the constant from the constant table.
1403 void ConstantAggregateZero::destroyConstantImpl() {
1404 getContext().pImpl->CAZConstants.erase(getType());
1407 /// destroyConstant - Remove the constant from the constant table...
1409 void ConstantArray::destroyConstantImpl() {
1410 getType()->getContext().pImpl->ArrayConstants.remove(this);
1414 //---- ConstantStruct::get() implementation...
1417 // destroyConstant - Remove the constant from the constant table...
1419 void ConstantStruct::destroyConstantImpl() {
1420 getType()->getContext().pImpl->StructConstants.remove(this);
1423 // destroyConstant - Remove the constant from the constant table...
1425 void ConstantVector::destroyConstantImpl() {
1426 getType()->getContext().pImpl->VectorConstants.remove(this);
1429 /// getSplatValue - If this is a splat vector constant, meaning that all of
1430 /// the elements have the same value, return that value. Otherwise return 0.
1431 Constant *Constant::getSplatValue() const {
1432 assert(this->getType()->isVectorTy() && "Only valid for vectors!");
1433 if (isa<ConstantAggregateZero>(this))
1434 return getNullValue(this->getType()->getVectorElementType());
1435 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
1436 return CV->getSplatValue();
1437 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
1438 return CV->getSplatValue();
1442 /// getSplatValue - If this is a splat constant, where all of the
1443 /// elements have the same value, return that value. Otherwise return null.
1444 Constant *ConstantVector::getSplatValue() const {
1445 // Check out first element.
1446 Constant *Elt = getOperand(0);
1447 // Then make sure all remaining elements point to the same value.
1448 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1449 if (getOperand(I) != Elt)
1454 /// If C is a constant integer then return its value, otherwise C must be a
1455 /// vector of constant integers, all equal, and the common value is returned.
1456 const APInt &Constant::getUniqueInteger() const {
1457 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
1458 return CI->getValue();
1459 assert(this->getSplatValue() && "Doesn't contain a unique integer!");
1460 const Constant *C = this->getAggregateElement(0U);
1461 assert(C && isa<ConstantInt>(C) && "Not a vector of numbers!");
1462 return cast<ConstantInt>(C)->getValue();
1465 //---- ConstantPointerNull::get() implementation.
1468 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1469 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1471 Entry = new ConstantPointerNull(Ty);
1476 // destroyConstant - Remove the constant from the constant table...
1478 void ConstantPointerNull::destroyConstantImpl() {
1479 getContext().pImpl->CPNConstants.erase(getType());
1483 //---- UndefValue::get() implementation.
1486 UndefValue *UndefValue::get(Type *Ty) {
1487 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1489 Entry = new UndefValue(Ty);
1494 // destroyConstant - Remove the constant from the constant table.
1496 void UndefValue::destroyConstantImpl() {
1497 // Free the constant and any dangling references to it.
1498 getContext().pImpl->UVConstants.erase(getType());
1501 //---- BlockAddress::get() implementation.
1504 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1505 assert(BB->getParent() && "Block must have a parent");
1506 return get(BB->getParent(), BB);
1509 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1511 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1513 BA = new BlockAddress(F, BB);
1515 assert(BA->getFunction() == F && "Basic block moved between functions");
1519 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1520 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1524 BB->AdjustBlockAddressRefCount(1);
1527 BlockAddress *BlockAddress::lookup(const BasicBlock *BB) {
1528 if (!BB->hasAddressTaken())
1531 const Function *F = BB->getParent();
1532 assert(F && "Block must have a parent");
1534 F->getContext().pImpl->BlockAddresses.lookup(std::make_pair(F, BB));
1535 assert(BA && "Refcount and block address map disagree!");
1539 // destroyConstant - Remove the constant from the constant table.
1541 void BlockAddress::destroyConstantImpl() {
1542 getFunction()->getType()->getContext().pImpl
1543 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1544 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1547 Value *BlockAddress::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
1548 // This could be replacing either the Basic Block or the Function. In either
1549 // case, we have to remove the map entry.
1550 Function *NewF = getFunction();
1551 BasicBlock *NewBB = getBasicBlock();
1554 NewF = cast<Function>(To->stripPointerCasts());
1556 NewBB = cast<BasicBlock>(To);
1558 // See if the 'new' entry already exists, if not, just update this in place
1559 // and return early.
1560 BlockAddress *&NewBA =
1561 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1565 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1567 // Remove the old entry, this can't cause the map to rehash (just a
1568 // tombstone will get added).
1569 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1572 setOperand(0, NewF);
1573 setOperand(1, NewBB);
1574 getBasicBlock()->AdjustBlockAddressRefCount(1);
1576 // If we just want to keep the existing value, then return null.
1577 // Callers know that this means we shouldn't delete this value.
1581 //---- ConstantExpr::get() implementations.
1584 /// This is a utility function to handle folding of casts and lookup of the
1585 /// cast in the ExprConstants map. It is used by the various get* methods below.
1586 static Constant *getFoldedCast(Instruction::CastOps opc, Constant *C, Type *Ty,
1587 bool OnlyIfReduced = false) {
1588 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1589 // Fold a few common cases
1590 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1596 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1598 // Look up the constant in the table first to ensure uniqueness.
1599 ConstantExprKeyType Key(opc, C);
1601 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1604 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty,
1605 bool OnlyIfReduced) {
1606 Instruction::CastOps opc = Instruction::CastOps(oc);
1607 assert(Instruction::isCast(opc) && "opcode out of range");
1608 assert(C && Ty && "Null arguments to getCast");
1609 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1613 llvm_unreachable("Invalid cast opcode");
1614 case Instruction::Trunc:
1615 return getTrunc(C, Ty, OnlyIfReduced);
1616 case Instruction::ZExt:
1617 return getZExt(C, Ty, OnlyIfReduced);
1618 case Instruction::SExt:
1619 return getSExt(C, Ty, OnlyIfReduced);
1620 case Instruction::FPTrunc:
1621 return getFPTrunc(C, Ty, OnlyIfReduced);
1622 case Instruction::FPExt:
1623 return getFPExtend(C, Ty, OnlyIfReduced);
1624 case Instruction::UIToFP:
1625 return getUIToFP(C, Ty, OnlyIfReduced);
1626 case Instruction::SIToFP:
1627 return getSIToFP(C, Ty, OnlyIfReduced);
1628 case Instruction::FPToUI:
1629 return getFPToUI(C, Ty, OnlyIfReduced);
1630 case Instruction::FPToSI:
1631 return getFPToSI(C, Ty, OnlyIfReduced);
1632 case Instruction::PtrToInt:
1633 return getPtrToInt(C, Ty, OnlyIfReduced);
1634 case Instruction::IntToPtr:
1635 return getIntToPtr(C, Ty, OnlyIfReduced);
1636 case Instruction::BitCast:
1637 return getBitCast(C, Ty, OnlyIfReduced);
1638 case Instruction::AddrSpaceCast:
1639 return getAddrSpaceCast(C, Ty, OnlyIfReduced);
1643 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1644 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1645 return getBitCast(C, Ty);
1646 return getZExt(C, Ty);
1649 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1650 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1651 return getBitCast(C, Ty);
1652 return getSExt(C, Ty);
1655 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1656 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1657 return getBitCast(C, Ty);
1658 return getTrunc(C, Ty);
1661 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1662 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1663 assert((Ty->isIntOrIntVectorTy() || Ty->isPtrOrPtrVectorTy()) &&
1666 if (Ty->isIntOrIntVectorTy())
1667 return getPtrToInt(S, Ty);
1669 unsigned SrcAS = S->getType()->getPointerAddressSpace();
1670 if (Ty->isPtrOrPtrVectorTy() && SrcAS != Ty->getPointerAddressSpace())
1671 return getAddrSpaceCast(S, Ty);
1673 return getBitCast(S, Ty);
1676 Constant *ConstantExpr::getPointerBitCastOrAddrSpaceCast(Constant *S,
1678 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1679 assert(Ty->isPtrOrPtrVectorTy() && "Invalid cast");
1681 if (S->getType()->getPointerAddressSpace() != Ty->getPointerAddressSpace())
1682 return getAddrSpaceCast(S, Ty);
1684 return getBitCast(S, Ty);
1687 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1689 assert(C->getType()->isIntOrIntVectorTy() &&
1690 Ty->isIntOrIntVectorTy() && "Invalid cast");
1691 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1692 unsigned DstBits = Ty->getScalarSizeInBits();
1693 Instruction::CastOps opcode =
1694 (SrcBits == DstBits ? Instruction::BitCast :
1695 (SrcBits > DstBits ? Instruction::Trunc :
1696 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1697 return getCast(opcode, C, Ty);
1700 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1701 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1703 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1704 unsigned DstBits = Ty->getScalarSizeInBits();
1705 if (SrcBits == DstBits)
1706 return C; // Avoid a useless cast
1707 Instruction::CastOps opcode =
1708 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1709 return getCast(opcode, C, Ty);
1712 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty, bool OnlyIfReduced) {
1714 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1715 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1717 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1718 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1719 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1720 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1721 "SrcTy must be larger than DestTy for Trunc!");
1723 return getFoldedCast(Instruction::Trunc, C, Ty, OnlyIfReduced);
1726 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty, bool OnlyIfReduced) {
1728 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1729 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1731 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1732 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1733 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1734 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1735 "SrcTy must be smaller than DestTy for SExt!");
1737 return getFoldedCast(Instruction::SExt, C, Ty, OnlyIfReduced);
1740 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty, bool OnlyIfReduced) {
1742 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1743 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1745 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1746 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1747 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1748 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1749 "SrcTy must be smaller than DestTy for ZExt!");
1751 return getFoldedCast(Instruction::ZExt, C, Ty, OnlyIfReduced);
1754 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty, bool OnlyIfReduced) {
1756 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1757 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1759 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1760 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1761 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1762 "This is an illegal floating point truncation!");
1763 return getFoldedCast(Instruction::FPTrunc, C, Ty, OnlyIfReduced);
1766 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty, bool OnlyIfReduced) {
1768 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1769 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1771 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1772 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1773 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1774 "This is an illegal floating point extension!");
1775 return getFoldedCast(Instruction::FPExt, C, Ty, OnlyIfReduced);
1778 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty, bool OnlyIfReduced) {
1780 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1781 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1783 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1784 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1785 "This is an illegal uint to floating point cast!");
1786 return getFoldedCast(Instruction::UIToFP, C, Ty, OnlyIfReduced);
1789 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty, bool OnlyIfReduced) {
1791 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1792 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1794 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1795 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1796 "This is an illegal sint to floating point cast!");
1797 return getFoldedCast(Instruction::SIToFP, C, Ty, OnlyIfReduced);
1800 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty, bool OnlyIfReduced) {
1802 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1803 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1805 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1806 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1807 "This is an illegal floating point to uint cast!");
1808 return getFoldedCast(Instruction::FPToUI, C, Ty, OnlyIfReduced);
1811 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty, bool OnlyIfReduced) {
1813 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1814 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1816 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1817 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1818 "This is an illegal floating point to sint cast!");
1819 return getFoldedCast(Instruction::FPToSI, C, Ty, OnlyIfReduced);
1822 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy,
1823 bool OnlyIfReduced) {
1824 assert(C->getType()->getScalarType()->isPointerTy() &&
1825 "PtrToInt source must be pointer or pointer vector");
1826 assert(DstTy->getScalarType()->isIntegerTy() &&
1827 "PtrToInt destination must be integer or integer vector");
1828 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1829 if (isa<VectorType>(C->getType()))
1830 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1831 "Invalid cast between a different number of vector elements");
1832 return getFoldedCast(Instruction::PtrToInt, C, DstTy, OnlyIfReduced);
1835 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy,
1836 bool OnlyIfReduced) {
1837 assert(C->getType()->getScalarType()->isIntegerTy() &&
1838 "IntToPtr source must be integer or integer vector");
1839 assert(DstTy->getScalarType()->isPointerTy() &&
1840 "IntToPtr destination must be a pointer or pointer vector");
1841 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1842 if (isa<VectorType>(C->getType()))
1843 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1844 "Invalid cast between a different number of vector elements");
1845 return getFoldedCast(Instruction::IntToPtr, C, DstTy, OnlyIfReduced);
1848 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy,
1849 bool OnlyIfReduced) {
1850 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1851 "Invalid constantexpr bitcast!");
1853 // It is common to ask for a bitcast of a value to its own type, handle this
1855 if (C->getType() == DstTy) return C;
1857 return getFoldedCast(Instruction::BitCast, C, DstTy, OnlyIfReduced);
1860 Constant *ConstantExpr::getAddrSpaceCast(Constant *C, Type *DstTy,
1861 bool OnlyIfReduced) {
1862 assert(CastInst::castIsValid(Instruction::AddrSpaceCast, C, DstTy) &&
1863 "Invalid constantexpr addrspacecast!");
1865 // Canonicalize addrspacecasts between different pointer types by first
1866 // bitcasting the pointer type and then converting the address space.
1867 PointerType *SrcScalarTy = cast<PointerType>(C->getType()->getScalarType());
1868 PointerType *DstScalarTy = cast<PointerType>(DstTy->getScalarType());
1869 Type *DstElemTy = DstScalarTy->getElementType();
1870 if (SrcScalarTy->getElementType() != DstElemTy) {
1871 Type *MidTy = PointerType::get(DstElemTy, SrcScalarTy->getAddressSpace());
1872 if (VectorType *VT = dyn_cast<VectorType>(DstTy)) {
1873 // Handle vectors of pointers.
1874 MidTy = VectorType::get(MidTy, VT->getNumElements());
1876 C = getBitCast(C, MidTy);
1878 return getFoldedCast(Instruction::AddrSpaceCast, C, DstTy, OnlyIfReduced);
1881 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1882 unsigned Flags, Type *OnlyIfReducedTy) {
1883 // Check the operands for consistency first.
1884 assert(Opcode >= Instruction::BinaryOpsBegin &&
1885 Opcode < Instruction::BinaryOpsEnd &&
1886 "Invalid opcode in binary constant expression");
1887 assert(C1->getType() == C2->getType() &&
1888 "Operand types in binary constant expression should match");
1892 case Instruction::Add:
1893 case Instruction::Sub:
1894 case Instruction::Mul:
1895 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1896 assert(C1->getType()->isIntOrIntVectorTy() &&
1897 "Tried to create an integer operation on a non-integer type!");
1899 case Instruction::FAdd:
1900 case Instruction::FSub:
1901 case Instruction::FMul:
1902 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1903 assert(C1->getType()->isFPOrFPVectorTy() &&
1904 "Tried to create a floating-point operation on a "
1905 "non-floating-point type!");
1907 case Instruction::UDiv:
1908 case Instruction::SDiv:
1909 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1910 assert(C1->getType()->isIntOrIntVectorTy() &&
1911 "Tried to create an arithmetic operation on a non-arithmetic type!");
1913 case Instruction::FDiv:
1914 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1915 assert(C1->getType()->isFPOrFPVectorTy() &&
1916 "Tried to create an arithmetic operation on a non-arithmetic type!");
1918 case Instruction::URem:
1919 case Instruction::SRem:
1920 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1921 assert(C1->getType()->isIntOrIntVectorTy() &&
1922 "Tried to create an arithmetic operation on a non-arithmetic type!");
1924 case Instruction::FRem:
1925 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1926 assert(C1->getType()->isFPOrFPVectorTy() &&
1927 "Tried to create an arithmetic operation on a non-arithmetic type!");
1929 case Instruction::And:
1930 case Instruction::Or:
1931 case Instruction::Xor:
1932 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1933 assert(C1->getType()->isIntOrIntVectorTy() &&
1934 "Tried to create a logical operation on a non-integral type!");
1936 case Instruction::Shl:
1937 case Instruction::LShr:
1938 case Instruction::AShr:
1939 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1940 assert(C1->getType()->isIntOrIntVectorTy() &&
1941 "Tried to create a shift operation on a non-integer type!");
1948 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1949 return FC; // Fold a few common cases.
1951 if (OnlyIfReducedTy == C1->getType())
1954 Constant *ArgVec[] = { C1, C2 };
1955 ConstantExprKeyType Key(Opcode, ArgVec, 0, Flags);
1957 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1958 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1961 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1962 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1963 // Note that a non-inbounds gep is used, as null isn't within any object.
1964 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1965 Constant *GEP = getGetElementPtr(
1966 Ty, Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1967 return getPtrToInt(GEP,
1968 Type::getInt64Ty(Ty->getContext()));
1971 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1972 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1973 // Note that a non-inbounds gep is used, as null isn't within any object.
1975 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, nullptr);
1976 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo(0));
1977 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1978 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1979 Constant *Indices[2] = { Zero, One };
1980 Constant *GEP = getGetElementPtr(AligningTy, NullPtr, Indices);
1981 return getPtrToInt(GEP,
1982 Type::getInt64Ty(Ty->getContext()));
1985 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1986 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1990 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1991 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1992 // Note that a non-inbounds gep is used, as null isn't within any object.
1993 Constant *GEPIdx[] = {
1994 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1997 Constant *GEP = getGetElementPtr(
1998 Ty, Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1999 return getPtrToInt(GEP,
2000 Type::getInt64Ty(Ty->getContext()));
2003 Constant *ConstantExpr::getCompare(unsigned short Predicate, Constant *C1,
2004 Constant *C2, bool OnlyIfReduced) {
2005 assert(C1->getType() == C2->getType() && "Op types should be identical!");
2007 switch (Predicate) {
2008 default: llvm_unreachable("Invalid CmpInst predicate");
2009 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
2010 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
2011 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
2012 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
2013 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
2014 case CmpInst::FCMP_TRUE:
2015 return getFCmp(Predicate, C1, C2, OnlyIfReduced);
2017 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
2018 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
2019 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
2020 case CmpInst::ICMP_SLE:
2021 return getICmp(Predicate, C1, C2, OnlyIfReduced);
2025 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2,
2026 Type *OnlyIfReducedTy) {
2027 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
2029 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
2030 return SC; // Fold common cases
2032 if (OnlyIfReducedTy == V1->getType())
2035 Constant *ArgVec[] = { C, V1, V2 };
2036 ConstantExprKeyType Key(Instruction::Select, ArgVec);
2038 LLVMContextImpl *pImpl = C->getContext().pImpl;
2039 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
2042 Constant *ConstantExpr::getGetElementPtr(Type *Ty, Constant *C,
2043 ArrayRef<Value *> Idxs, bool InBounds,
2044 Type *OnlyIfReducedTy) {
2046 Ty = cast<PointerType>(C->getType()->getScalarType())->getElementType();
2050 cast<PointerType>(C->getType()->getScalarType())->getContainedType(0u));
2052 if (Constant *FC = ConstantFoldGetElementPtr(Ty, C, InBounds, Idxs))
2053 return FC; // Fold a few common cases.
2055 // Get the result type of the getelementptr!
2056 Type *DestTy = GetElementPtrInst::getIndexedType(Ty, Idxs);
2057 assert(DestTy && "GEP indices invalid!");
2058 unsigned AS = C->getType()->getPointerAddressSpace();
2059 Type *ReqTy = DestTy->getPointerTo(AS);
2060 if (VectorType *VecTy = dyn_cast<VectorType>(C->getType()))
2061 ReqTy = VectorType::get(ReqTy, VecTy->getNumElements());
2063 if (OnlyIfReducedTy == ReqTy)
2066 // Look up the constant in the table first to ensure uniqueness
2067 std::vector<Constant*> ArgVec;
2068 ArgVec.reserve(1 + Idxs.size());
2069 ArgVec.push_back(C);
2070 for (unsigned i = 0, e = Idxs.size(); i != e; ++i) {
2071 assert(Idxs[i]->getType()->isVectorTy() == ReqTy->isVectorTy() &&
2072 "getelementptr index type missmatch");
2073 assert((!Idxs[i]->getType()->isVectorTy() ||
2074 ReqTy->getVectorNumElements() ==
2075 Idxs[i]->getType()->getVectorNumElements()) &&
2076 "getelementptr index type missmatch");
2077 ArgVec.push_back(cast<Constant>(Idxs[i]));
2079 const ConstantExprKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
2080 InBounds ? GEPOperator::IsInBounds : 0, None,
2083 LLVMContextImpl *pImpl = C->getContext().pImpl;
2084 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2087 Constant *ConstantExpr::getICmp(unsigned short pred, Constant *LHS,
2088 Constant *RHS, bool OnlyIfReduced) {
2089 assert(LHS->getType() == RHS->getType());
2090 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
2091 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
2093 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
2094 return FC; // Fold a few common cases...
2099 // Look up the constant in the table first to ensure uniqueness
2100 Constant *ArgVec[] = { LHS, RHS };
2101 // Get the key type with both the opcode and predicate
2102 const ConstantExprKeyType Key(Instruction::ICmp, ArgVec, pred);
2104 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
2105 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
2106 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
2108 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
2109 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
2112 Constant *ConstantExpr::getFCmp(unsigned short pred, Constant *LHS,
2113 Constant *RHS, bool OnlyIfReduced) {
2114 assert(LHS->getType() == RHS->getType());
2115 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
2117 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
2118 return FC; // Fold a few common cases...
2123 // Look up the constant in the table first to ensure uniqueness
2124 Constant *ArgVec[] = { LHS, RHS };
2125 // Get the key type with both the opcode and predicate
2126 const ConstantExprKeyType Key(Instruction::FCmp, ArgVec, pred);
2128 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
2129 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
2130 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
2132 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
2133 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
2136 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx,
2137 Type *OnlyIfReducedTy) {
2138 assert(Val->getType()->isVectorTy() &&
2139 "Tried to create extractelement operation on non-vector type!");
2140 assert(Idx->getType()->isIntegerTy() &&
2141 "Extractelement index must be an integer type!");
2143 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
2144 return FC; // Fold a few common cases.
2146 Type *ReqTy = Val->getType()->getVectorElementType();
2147 if (OnlyIfReducedTy == ReqTy)
2150 // Look up the constant in the table first to ensure uniqueness
2151 Constant *ArgVec[] = { Val, Idx };
2152 const ConstantExprKeyType Key(Instruction::ExtractElement, ArgVec);
2154 LLVMContextImpl *pImpl = Val->getContext().pImpl;
2155 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2158 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
2159 Constant *Idx, Type *OnlyIfReducedTy) {
2160 assert(Val->getType()->isVectorTy() &&
2161 "Tried to create insertelement operation on non-vector type!");
2162 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
2163 "Insertelement types must match!");
2164 assert(Idx->getType()->isIntegerTy() &&
2165 "Insertelement index must be i32 type!");
2167 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
2168 return FC; // Fold a few common cases.
2170 if (OnlyIfReducedTy == Val->getType())
2173 // Look up the constant in the table first to ensure uniqueness
2174 Constant *ArgVec[] = { Val, Elt, Idx };
2175 const ConstantExprKeyType Key(Instruction::InsertElement, ArgVec);
2177 LLVMContextImpl *pImpl = Val->getContext().pImpl;
2178 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
2181 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
2182 Constant *Mask, Type *OnlyIfReducedTy) {
2183 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
2184 "Invalid shuffle vector constant expr operands!");
2186 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
2187 return FC; // Fold a few common cases.
2189 unsigned NElts = Mask->getType()->getVectorNumElements();
2190 Type *EltTy = V1->getType()->getVectorElementType();
2191 Type *ShufTy = VectorType::get(EltTy, NElts);
2193 if (OnlyIfReducedTy == ShufTy)
2196 // Look up the constant in the table first to ensure uniqueness
2197 Constant *ArgVec[] = { V1, V2, Mask };
2198 const ConstantExprKeyType Key(Instruction::ShuffleVector, ArgVec);
2200 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
2201 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
2204 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
2205 ArrayRef<unsigned> Idxs,
2206 Type *OnlyIfReducedTy) {
2207 assert(Agg->getType()->isFirstClassType() &&
2208 "Non-first-class type for constant insertvalue expression");
2210 assert(ExtractValueInst::getIndexedType(Agg->getType(),
2211 Idxs) == Val->getType() &&
2212 "insertvalue indices invalid!");
2213 Type *ReqTy = Val->getType();
2215 if (Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs))
2218 if (OnlyIfReducedTy == ReqTy)
2221 Constant *ArgVec[] = { Agg, Val };
2222 const ConstantExprKeyType Key(Instruction::InsertValue, ArgVec, 0, 0, Idxs);
2224 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
2225 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2228 Constant *ConstantExpr::getExtractValue(Constant *Agg, ArrayRef<unsigned> Idxs,
2229 Type *OnlyIfReducedTy) {
2230 assert(Agg->getType()->isFirstClassType() &&
2231 "Tried to create extractelement operation on non-first-class type!");
2233 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
2235 assert(ReqTy && "extractvalue indices invalid!");
2237 assert(Agg->getType()->isFirstClassType() &&
2238 "Non-first-class type for constant extractvalue expression");
2239 if (Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs))
2242 if (OnlyIfReducedTy == ReqTy)
2245 Constant *ArgVec[] = { Agg };
2246 const ConstantExprKeyType Key(Instruction::ExtractValue, ArgVec, 0, 0, Idxs);
2248 LLVMContextImpl *pImpl = Agg->getContext().pImpl;
2249 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
2252 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
2253 assert(C->getType()->isIntOrIntVectorTy() &&
2254 "Cannot NEG a nonintegral value!");
2255 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
2259 Constant *ConstantExpr::getFNeg(Constant *C) {
2260 assert(C->getType()->isFPOrFPVectorTy() &&
2261 "Cannot FNEG a non-floating-point value!");
2262 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
2265 Constant *ConstantExpr::getNot(Constant *C) {
2266 assert(C->getType()->isIntOrIntVectorTy() &&
2267 "Cannot NOT a nonintegral value!");
2268 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
2271 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
2272 bool HasNUW, bool HasNSW) {
2273 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2274 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2275 return get(Instruction::Add, C1, C2, Flags);
2278 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
2279 return get(Instruction::FAdd, C1, C2);
2282 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
2283 bool HasNUW, bool HasNSW) {
2284 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2285 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2286 return get(Instruction::Sub, C1, C2, Flags);
2289 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
2290 return get(Instruction::FSub, C1, C2);
2293 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
2294 bool HasNUW, bool HasNSW) {
2295 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2296 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2297 return get(Instruction::Mul, C1, C2, Flags);
2300 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
2301 return get(Instruction::FMul, C1, C2);
2304 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
2305 return get(Instruction::UDiv, C1, C2,
2306 isExact ? PossiblyExactOperator::IsExact : 0);
2309 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
2310 return get(Instruction::SDiv, C1, C2,
2311 isExact ? PossiblyExactOperator::IsExact : 0);
2314 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
2315 return get(Instruction::FDiv, C1, C2);
2318 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
2319 return get(Instruction::URem, C1, C2);
2322 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
2323 return get(Instruction::SRem, C1, C2);
2326 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
2327 return get(Instruction::FRem, C1, C2);
2330 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
2331 return get(Instruction::And, C1, C2);
2334 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
2335 return get(Instruction::Or, C1, C2);
2338 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
2339 return get(Instruction::Xor, C1, C2);
2342 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
2343 bool HasNUW, bool HasNSW) {
2344 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2345 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2346 return get(Instruction::Shl, C1, C2, Flags);
2349 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2350 return get(Instruction::LShr, C1, C2,
2351 isExact ? PossiblyExactOperator::IsExact : 0);
2354 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2355 return get(Instruction::AShr, C1, C2,
2356 isExact ? PossiblyExactOperator::IsExact : 0);
2359 /// getBinOpIdentity - Return the identity for the given binary operation,
2360 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2361 /// returns null if the operator doesn't have an identity.
2362 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2365 // Doesn't have an identity.
2368 case Instruction::Add:
2369 case Instruction::Or:
2370 case Instruction::Xor:
2371 return Constant::getNullValue(Ty);
2373 case Instruction::Mul:
2374 return ConstantInt::get(Ty, 1);
2376 case Instruction::And:
2377 return Constant::getAllOnesValue(Ty);
2381 /// getBinOpAbsorber - Return the absorbing element for the given binary
2382 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2383 /// every X. For example, this returns zero for integer multiplication.
2384 /// It returns null if the operator doesn't have an absorbing element.
2385 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2388 // Doesn't have an absorber.
2391 case Instruction::Or:
2392 return Constant::getAllOnesValue(Ty);
2394 case Instruction::And:
2395 case Instruction::Mul:
2396 return Constant::getNullValue(Ty);
2400 // destroyConstant - Remove the constant from the constant table...
2402 void ConstantExpr::destroyConstantImpl() {
2403 getType()->getContext().pImpl->ExprConstants.remove(this);
2406 const char *ConstantExpr::getOpcodeName() const {
2407 return Instruction::getOpcodeName(getOpcode());
2410 GetElementPtrConstantExpr::GetElementPtrConstantExpr(
2411 Type *SrcElementTy, Constant *C, ArrayRef<Constant *> IdxList, Type *DestTy)
2412 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2413 OperandTraits<GetElementPtrConstantExpr>::op_end(this) -
2414 (IdxList.size() + 1),
2415 IdxList.size() + 1),
2416 SrcElementTy(SrcElementTy) {
2418 Use *OperandList = getOperandList();
2419 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2420 OperandList[i+1] = IdxList[i];
2423 Type *GetElementPtrConstantExpr::getSourceElementType() const {
2424 return SrcElementTy;
2427 //===----------------------------------------------------------------------===//
2428 // ConstantData* implementations
2430 void ConstantDataArray::anchor() {}
2431 void ConstantDataVector::anchor() {}
2433 /// getElementType - Return the element type of the array/vector.
2434 Type *ConstantDataSequential::getElementType() const {
2435 return getType()->getElementType();
2438 StringRef ConstantDataSequential::getRawDataValues() const {
2439 return StringRef(DataElements, getNumElements()*getElementByteSize());
2442 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2443 /// formed with a vector or array of the specified element type.
2444 /// ConstantDataArray only works with normal float and int types that are
2445 /// stored densely in memory, not with things like i42 or x86_f80.
2446 bool ConstantDataSequential::isElementTypeCompatible(Type *Ty) {
2447 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2448 if (auto *IT = dyn_cast<IntegerType>(Ty)) {
2449 switch (IT->getBitWidth()) {
2461 /// getNumElements - Return the number of elements in the array or vector.
2462 unsigned ConstantDataSequential::getNumElements() const {
2463 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2464 return AT->getNumElements();
2465 return getType()->getVectorNumElements();
2469 /// getElementByteSize - Return the size in bytes of the elements in the data.
2470 uint64_t ConstantDataSequential::getElementByteSize() const {
2471 return getElementType()->getPrimitiveSizeInBits()/8;
2474 /// getElementPointer - Return the start of the specified element.
2475 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2476 assert(Elt < getNumElements() && "Invalid Elt");
2477 return DataElements+Elt*getElementByteSize();
2481 /// isAllZeros - return true if the array is empty or all zeros.
2482 static bool isAllZeros(StringRef Arr) {
2483 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2489 /// getImpl - This is the underlying implementation of all of the
2490 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2491 /// the correct element type. We take the bytes in as a StringRef because
2492 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2493 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2494 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2495 // If the elements are all zero or there are no elements, return a CAZ, which
2496 // is more dense and canonical.
2497 if (isAllZeros(Elements))
2498 return ConstantAggregateZero::get(Ty);
2500 // Do a lookup to see if we have already formed one of these.
2503 .pImpl->CDSConstants.insert(std::make_pair(Elements, nullptr))
2506 // The bucket can point to a linked list of different CDS's that have the same
2507 // body but different types. For example, 0,0,0,1 could be a 4 element array
2508 // of i8, or a 1-element array of i32. They'll both end up in the same
2509 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2510 ConstantDataSequential **Entry = &Slot.second;
2511 for (ConstantDataSequential *Node = *Entry; Node;
2512 Entry = &Node->Next, Node = *Entry)
2513 if (Node->getType() == Ty)
2516 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2518 if (isa<ArrayType>(Ty))
2519 return *Entry = new ConstantDataArray(Ty, Slot.first().data());
2521 assert(isa<VectorType>(Ty));
2522 return *Entry = new ConstantDataVector(Ty, Slot.first().data());
2525 void ConstantDataSequential::destroyConstantImpl() {
2526 // Remove the constant from the StringMap.
2527 StringMap<ConstantDataSequential*> &CDSConstants =
2528 getType()->getContext().pImpl->CDSConstants;
2530 StringMap<ConstantDataSequential*>::iterator Slot =
2531 CDSConstants.find(getRawDataValues());
2533 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2535 ConstantDataSequential **Entry = &Slot->getValue();
2537 // Remove the entry from the hash table.
2538 if (!(*Entry)->Next) {
2539 // If there is only one value in the bucket (common case) it must be this
2540 // entry, and removing the entry should remove the bucket completely.
2541 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2542 getContext().pImpl->CDSConstants.erase(Slot);
2544 // Otherwise, there are multiple entries linked off the bucket, unlink the
2545 // node we care about but keep the bucket around.
2546 for (ConstantDataSequential *Node = *Entry; ;
2547 Entry = &Node->Next, Node = *Entry) {
2548 assert(Node && "Didn't find entry in its uniquing hash table!");
2549 // If we found our entry, unlink it from the list and we're done.
2551 *Entry = Node->Next;
2557 // If we were part of a list, make sure that we don't delete the list that is
2558 // still owned by the uniquing map.
2562 /// get() constructors - Return a constant with array type with an element
2563 /// count and element type matching the ArrayRef passed in. Note that this
2564 /// can return a ConstantAggregateZero object.
2565 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2566 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2567 const char *Data = reinterpret_cast<const char *>(Elts.data());
2568 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2570 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2571 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2572 const char *Data = reinterpret_cast<const char *>(Elts.data());
2573 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2575 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2576 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2577 const char *Data = reinterpret_cast<const char *>(Elts.data());
2578 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2580 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2581 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2582 const char *Data = reinterpret_cast<const char *>(Elts.data());
2583 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2585 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2586 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2587 const char *Data = reinterpret_cast<const char *>(Elts.data());
2588 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2590 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2591 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2592 const char *Data = reinterpret_cast<const char *>(Elts.data());
2593 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 8), Ty);
2596 /// getFP() constructors - Return a constant with array type with an element
2597 /// count and element type of float with precision matching the number of
2598 /// bits in the ArrayRef passed in. (i.e. half for 16bits, float for 32bits,
2599 /// double for 64bits) Note that this can return a ConstantAggregateZero
2601 Constant *ConstantDataArray::getFP(LLVMContext &Context,
2602 ArrayRef<uint16_t> Elts) {
2603 Type *Ty = VectorType::get(Type::getHalfTy(Context), Elts.size());
2604 const char *Data = reinterpret_cast<const char *>(Elts.data());
2605 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 2), Ty);
2607 Constant *ConstantDataArray::getFP(LLVMContext &Context,
2608 ArrayRef<uint32_t> Elts) {
2609 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2610 const char *Data = reinterpret_cast<const char *>(Elts.data());
2611 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 4), Ty);
2613 Constant *ConstantDataArray::getFP(LLVMContext &Context,
2614 ArrayRef<uint64_t> Elts) {
2615 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2616 const char *Data = reinterpret_cast<const char *>(Elts.data());
2617 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 8), Ty);
2620 /// getString - This method constructs a CDS and initializes it with a text
2621 /// string. The default behavior (AddNull==true) causes a null terminator to
2622 /// be placed at the end of the array (increasing the length of the string by
2623 /// one more than the StringRef would normally indicate. Pass AddNull=false
2624 /// to disable this behavior.
2625 Constant *ConstantDataArray::getString(LLVMContext &Context,
2626 StringRef Str, bool AddNull) {
2628 const uint8_t *Data = reinterpret_cast<const uint8_t *>(Str.data());
2629 return get(Context, makeArrayRef(const_cast<uint8_t *>(Data),
2633 SmallVector<uint8_t, 64> ElementVals;
2634 ElementVals.append(Str.begin(), Str.end());
2635 ElementVals.push_back(0);
2636 return get(Context, ElementVals);
2639 /// get() constructors - Return a constant with vector type with an element
2640 /// count and element type matching the ArrayRef passed in. Note that this
2641 /// can return a ConstantAggregateZero object.
2642 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2643 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2644 const char *Data = reinterpret_cast<const char *>(Elts.data());
2645 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2647 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2648 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2649 const char *Data = reinterpret_cast<const char *>(Elts.data());
2650 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2652 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2653 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2654 const char *Data = reinterpret_cast<const char *>(Elts.data());
2655 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2657 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2658 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2659 const char *Data = reinterpret_cast<const char *>(Elts.data());
2660 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2662 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2663 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2664 const char *Data = reinterpret_cast<const char *>(Elts.data());
2665 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2667 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2668 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2669 const char *Data = reinterpret_cast<const char *>(Elts.data());
2670 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 8), Ty);
2673 /// getFP() constructors - Return a constant with vector type with an element
2674 /// count and element type of float with the precision matching the number of
2675 /// bits in the ArrayRef passed in. (i.e. half for 16bits, float for 32bits,
2676 /// double for 64bits) Note that this can return a ConstantAggregateZero
2678 Constant *ConstantDataVector::getFP(LLVMContext &Context,
2679 ArrayRef<uint16_t> Elts) {
2680 Type *Ty = VectorType::get(Type::getHalfTy(Context), Elts.size());
2681 const char *Data = reinterpret_cast<const char *>(Elts.data());
2682 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 2), Ty);
2684 Constant *ConstantDataVector::getFP(LLVMContext &Context,
2685 ArrayRef<uint32_t> Elts) {
2686 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2687 const char *Data = reinterpret_cast<const char *>(Elts.data());
2688 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 4), Ty);
2690 Constant *ConstantDataVector::getFP(LLVMContext &Context,
2691 ArrayRef<uint64_t> Elts) {
2692 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2693 const char *Data = reinterpret_cast<const char *>(Elts.data());
2694 return getImpl(StringRef(const_cast<char *>(Data), Elts.size() * 8), Ty);
2697 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2698 assert(isElementTypeCompatible(V->getType()) &&
2699 "Element type not compatible with ConstantData");
2700 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2701 if (CI->getType()->isIntegerTy(8)) {
2702 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2703 return get(V->getContext(), Elts);
2705 if (CI->getType()->isIntegerTy(16)) {
2706 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2707 return get(V->getContext(), Elts);
2709 if (CI->getType()->isIntegerTy(32)) {
2710 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2711 return get(V->getContext(), Elts);
2713 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2714 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2715 return get(V->getContext(), Elts);
2718 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2719 if (CFP->getType()->isFloatTy()) {
2720 SmallVector<uint32_t, 16> Elts(
2721 NumElts, CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
2722 return getFP(V->getContext(), Elts);
2724 if (CFP->getType()->isDoubleTy()) {
2725 SmallVector<uint64_t, 16> Elts(
2726 NumElts, CFP->getValueAPF().bitcastToAPInt().getLimitedValue());
2727 return getFP(V->getContext(), Elts);
2730 return ConstantVector::getSplat(NumElts, V);
2734 /// getElementAsInteger - If this is a sequential container of integers (of
2735 /// any size), return the specified element in the low bits of a uint64_t.
2736 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2737 assert(isa<IntegerType>(getElementType()) &&
2738 "Accessor can only be used when element is an integer");
2739 const char *EltPtr = getElementPointer(Elt);
2741 // The data is stored in host byte order, make sure to cast back to the right
2742 // type to load with the right endianness.
2743 switch (getElementType()->getIntegerBitWidth()) {
2744 default: llvm_unreachable("Invalid bitwidth for CDS");
2746 return *const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(EltPtr));
2748 return *const_cast<uint16_t *>(reinterpret_cast<const uint16_t *>(EltPtr));
2750 return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(EltPtr));
2752 return *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(EltPtr));
2756 /// getElementAsAPFloat - If this is a sequential container of floating point
2757 /// type, return the specified element as an APFloat.
2758 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2759 const char *EltPtr = getElementPointer(Elt);
2761 switch (getElementType()->getTypeID()) {
2763 llvm_unreachable("Accessor can only be used when element is float/double!");
2764 case Type::FloatTyID: {
2765 auto EltVal = *reinterpret_cast<const uint32_t *>(EltPtr);
2766 return APFloat(APFloat::IEEEsingle, APInt(32, EltVal));
2768 case Type::DoubleTyID: {
2769 auto EltVal = *reinterpret_cast<const uint64_t *>(EltPtr);
2770 return APFloat(APFloat::IEEEdouble, APInt(64, EltVal));
2775 /// getElementAsFloat - If this is an sequential container of floats, return
2776 /// the specified element as a float.
2777 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2778 assert(getElementType()->isFloatTy() &&
2779 "Accessor can only be used when element is a 'float'");
2780 const float *EltPtr = reinterpret_cast<const float *>(getElementPointer(Elt));
2781 return *const_cast<float *>(EltPtr);
2784 /// getElementAsDouble - If this is an sequential container of doubles, return
2785 /// the specified element as a float.
2786 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2787 assert(getElementType()->isDoubleTy() &&
2788 "Accessor can only be used when element is a 'float'");
2789 const double *EltPtr =
2790 reinterpret_cast<const double *>(getElementPointer(Elt));
2791 return *const_cast<double *>(EltPtr);
2794 /// getElementAsConstant - Return a Constant for a specified index's element.
2795 /// Note that this has to compute a new constant to return, so it isn't as
2796 /// efficient as getElementAsInteger/Float/Double.
2797 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2798 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2799 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2801 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2804 /// isString - This method returns true if this is an array of i8.
2805 bool ConstantDataSequential::isString() const {
2806 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2809 /// isCString - This method returns true if the array "isString", ends with a
2810 /// nul byte, and does not contains any other nul bytes.
2811 bool ConstantDataSequential::isCString() const {
2815 StringRef Str = getAsString();
2817 // The last value must be nul.
2818 if (Str.back() != 0) return false;
2820 // Other elements must be non-nul.
2821 return Str.drop_back().find(0) == StringRef::npos;
2824 /// getSplatValue - If this is a splat constant, meaning that all of the
2825 /// elements have the same value, return that value. Otherwise return nullptr.
2826 Constant *ConstantDataVector::getSplatValue() const {
2827 const char *Base = getRawDataValues().data();
2829 // Compare elements 1+ to the 0'th element.
2830 unsigned EltSize = getElementByteSize();
2831 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2832 if (memcmp(Base, Base+i*EltSize, EltSize))
2835 // If they're all the same, return the 0th one as a representative.
2836 return getElementAsConstant(0);
2839 //===----------------------------------------------------------------------===//
2840 // handleOperandChange implementations
2842 /// Update this constant array to change uses of
2843 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2846 /// Note that we intentionally replace all uses of From with To here. Consider
2847 /// a large array that uses 'From' 1000 times. By handling this case all here,
2848 /// ConstantArray::handleOperandChange is only invoked once, and that
2849 /// single invocation handles all 1000 uses. Handling them one at a time would
2850 /// work, but would be really slow because it would have to unique each updated
2853 void Constant::handleOperandChange(Value *From, Value *To, Use *U) {
2854 Value *Replacement = nullptr;
2855 switch (getValueID()) {
2857 llvm_unreachable("Not a constant!");
2858 #define HANDLE_CONSTANT(Name) \
2859 case Value::Name##Val: \
2860 Replacement = cast<Name>(this)->handleOperandChangeImpl(From, To, U); \
2862 #include "llvm/IR/Value.def"
2865 // If handleOperandChangeImpl returned nullptr, then it handled
2866 // replacing itself and we don't want to delete or replace anything else here.
2870 // I do need to replace this with an existing value.
2871 assert(Replacement != this && "I didn't contain From!");
2873 // Everyone using this now uses the replacement.
2874 replaceAllUsesWith(Replacement);
2876 // Delete the old constant!
2880 Value *ConstantInt::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2881 llvm_unreachable("Unsupported class for handleOperandChange()!");
2884 Value *ConstantFP::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2885 llvm_unreachable("Unsupported class for handleOperandChange()!");
2888 Value *ConstantTokenNone::handleOperandChangeImpl(Value *From, Value *To,
2890 llvm_unreachable("Unsupported class for handleOperandChange()!");
2893 Value *UndefValue::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2894 llvm_unreachable("Unsupported class for handleOperandChange()!");
2897 Value *ConstantPointerNull::handleOperandChangeImpl(Value *From, Value *To,
2899 llvm_unreachable("Unsupported class for handleOperandChange()!");
2902 Value *ConstantAggregateZero::handleOperandChangeImpl(Value *From, Value *To,
2904 llvm_unreachable("Unsupported class for handleOperandChange()!");
2907 Value *ConstantDataSequential::handleOperandChangeImpl(Value *From, Value *To,
2909 llvm_unreachable("Unsupported class for handleOperandChange()!");
2912 Value *ConstantArray::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2913 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2914 Constant *ToC = cast<Constant>(To);
2916 SmallVector<Constant*, 8> Values;
2917 Values.reserve(getNumOperands()); // Build replacement array.
2919 // Fill values with the modified operands of the constant array. Also,
2920 // compute whether this turns into an all-zeros array.
2921 unsigned NumUpdated = 0;
2923 // Keep track of whether all the values in the array are "ToC".
2924 bool AllSame = true;
2925 Use *OperandList = getOperandList();
2926 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2927 Constant *Val = cast<Constant>(O->get());
2932 Values.push_back(Val);
2933 AllSame &= Val == ToC;
2936 if (AllSame && ToC->isNullValue())
2937 return ConstantAggregateZero::get(getType());
2939 if (AllSame && isa<UndefValue>(ToC))
2940 return UndefValue::get(getType());
2942 // Check for any other type of constant-folding.
2943 if (Constant *C = getImpl(getType(), Values))
2946 // Update to the new value.
2947 return getContext().pImpl->ArrayConstants.replaceOperandsInPlace(
2948 Values, this, From, ToC, NumUpdated, U - OperandList);
2951 Value *ConstantStruct::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2952 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2953 Constant *ToC = cast<Constant>(To);
2955 Use *OperandList = getOperandList();
2956 unsigned OperandToUpdate = U-OperandList;
2957 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2959 SmallVector<Constant*, 8> Values;
2960 Values.reserve(getNumOperands()); // Build replacement struct.
2962 // Fill values with the modified operands of the constant struct. Also,
2963 // compute whether this turns into an all-zeros struct.
2964 bool isAllZeros = false;
2965 bool isAllUndef = false;
2966 if (ToC->isNullValue()) {
2968 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2969 Constant *Val = cast<Constant>(O->get());
2970 Values.push_back(Val);
2971 if (isAllZeros) isAllZeros = Val->isNullValue();
2973 } else if (isa<UndefValue>(ToC)) {
2975 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2976 Constant *Val = cast<Constant>(O->get());
2977 Values.push_back(Val);
2978 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2981 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2982 Values.push_back(cast<Constant>(O->get()));
2984 Values[OperandToUpdate] = ToC;
2987 return ConstantAggregateZero::get(getType());
2990 return UndefValue::get(getType());
2992 // Update to the new value.
2993 return getContext().pImpl->StructConstants.replaceOperandsInPlace(
2994 Values, this, From, ToC);
2997 Value *ConstantVector::handleOperandChangeImpl(Value *From, Value *To, Use *U) {
2998 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2999 Constant *ToC = cast<Constant>(To);
3001 SmallVector<Constant*, 8> Values;
3002 Values.reserve(getNumOperands()); // Build replacement array...
3003 unsigned NumUpdated = 0;
3004 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
3005 Constant *Val = getOperand(i);
3010 Values.push_back(Val);
3013 if (Constant *C = getImpl(Values))
3016 // Update to the new value.
3017 Use *OperandList = getOperandList();
3018 return getContext().pImpl->VectorConstants.replaceOperandsInPlace(
3019 Values, this, From, ToC, NumUpdated, U - OperandList);
3022 Value *ConstantExpr::handleOperandChangeImpl(Value *From, Value *ToV, Use *U) {
3023 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
3024 Constant *To = cast<Constant>(ToV);
3026 SmallVector<Constant*, 8> NewOps;
3027 unsigned NumUpdated = 0;
3028 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
3029 Constant *Op = getOperand(i);
3034 NewOps.push_back(Op);
3036 assert(NumUpdated && "I didn't contain From!");
3038 if (Constant *C = getWithOperands(NewOps, getType(), true))
3041 // Update to the new value.
3042 Use *OperandList = getOperandList();
3043 return getContext().pImpl->ExprConstants.replaceOperandsInPlace(
3044 NewOps, this, From, To, NumUpdated, U - OperandList);
3047 Instruction *ConstantExpr::getAsInstruction() {
3048 SmallVector<Value *, 4> ValueOperands(op_begin(), op_end());
3049 ArrayRef<Value*> Ops(ValueOperands);
3051 switch (getOpcode()) {
3052 case Instruction::Trunc:
3053 case Instruction::ZExt:
3054 case Instruction::SExt:
3055 case Instruction::FPTrunc:
3056 case Instruction::FPExt:
3057 case Instruction::UIToFP:
3058 case Instruction::SIToFP:
3059 case Instruction::FPToUI:
3060 case Instruction::FPToSI:
3061 case Instruction::PtrToInt:
3062 case Instruction::IntToPtr:
3063 case Instruction::BitCast:
3064 case Instruction::AddrSpaceCast:
3065 return CastInst::Create((Instruction::CastOps)getOpcode(),
3067 case Instruction::Select:
3068 return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
3069 case Instruction::InsertElement:
3070 return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
3071 case Instruction::ExtractElement:
3072 return ExtractElementInst::Create(Ops[0], Ops[1]);
3073 case Instruction::InsertValue:
3074 return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
3075 case Instruction::ExtractValue:
3076 return ExtractValueInst::Create(Ops[0], getIndices());
3077 case Instruction::ShuffleVector:
3078 return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
3080 case Instruction::GetElementPtr: {
3081 const auto *GO = cast<GEPOperator>(this);
3082 if (GO->isInBounds())
3083 return GetElementPtrInst::CreateInBounds(GO->getSourceElementType(),
3084 Ops[0], Ops.slice(1));
3085 return GetElementPtrInst::Create(GO->getSourceElementType(), Ops[0],
3088 case Instruction::ICmp:
3089 case Instruction::FCmp:
3090 return CmpInst::Create((Instruction::OtherOps)getOpcode(),
3091 getPredicate(), Ops[0], Ops[1]);
3094 assert(getNumOperands() == 2 && "Must be binary operator?");
3095 BinaryOperator *BO =
3096 BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
3098 if (isa<OverflowingBinaryOperator>(BO)) {
3099 BO->setHasNoUnsignedWrap(SubclassOptionalData &
3100 OverflowingBinaryOperator::NoUnsignedWrap);
3101 BO->setHasNoSignedWrap(SubclassOptionalData &
3102 OverflowingBinaryOperator::NoSignedWrap);
3104 if (isa<PossiblyExactOperator>(BO))
3105 BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);