1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Constants.h"
15 #include "ConstantFold.h"
16 #include "LLVMContextImpl.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/FoldingSet.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/GlobalValue.h"
25 #include "llvm/IR/Instructions.h"
26 #include "llvm/IR/Module.h"
27 #include "llvm/IR/Operator.h"
28 #include "llvm/Support/Compiler.h"
29 #include "llvm/Support/Debug.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/Support/ManagedStatic.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Support/raw_ostream.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Equivalent for a vector of -0.0's.
51 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
52 if (ConstantFP *SplatCFP = dyn_cast_or_null<ConstantFP>(CV->getSplatValue()))
53 if (SplatCFP && SplatCFP->isZero() && SplatCFP->isNegative())
56 // We've already handled true FP case; any other FP vectors can't represent -0.0.
57 if (getType()->isFPOrFPVectorTy())
60 // Otherwise, just use +0.0.
64 // Return true iff this constant is positive zero (floating point), negative
65 // zero (floating point), or a null value.
66 bool Constant::isZeroValue() const {
67 // Floating point values have an explicit -0.0 value.
68 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
71 // Otherwise, just use +0.0.
75 bool Constant::isNullValue() const {
77 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
81 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
82 return CFP->isZero() && !CFP->isNegative();
84 // constant zero is zero for aggregates and cpnull is null for pointers.
85 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
88 bool Constant::isAllOnesValue() const {
89 // Check for -1 integers
90 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
91 return CI->isMinusOne();
93 // Check for FP which are bitcasted from -1 integers
94 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
95 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
97 // Check for constant vectors which are splats of -1 values.
98 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
99 if (Constant *Splat = CV->getSplatValue())
100 return Splat->isAllOnesValue();
102 // Check for constant vectors which are splats of -1 values.
103 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
104 if (Constant *Splat = CV->getSplatValue())
105 return Splat->isAllOnesValue();
110 // Constructor to create a '0' constant of arbitrary type...
111 Constant *Constant::getNullValue(Type *Ty) {
112 switch (Ty->getTypeID()) {
113 case Type::IntegerTyID:
114 return ConstantInt::get(Ty, 0);
116 return ConstantFP::get(Ty->getContext(),
117 APFloat::getZero(APFloat::IEEEhalf));
118 case Type::FloatTyID:
119 return ConstantFP::get(Ty->getContext(),
120 APFloat::getZero(APFloat::IEEEsingle));
121 case Type::DoubleTyID:
122 return ConstantFP::get(Ty->getContext(),
123 APFloat::getZero(APFloat::IEEEdouble));
124 case Type::X86_FP80TyID:
125 return ConstantFP::get(Ty->getContext(),
126 APFloat::getZero(APFloat::x87DoubleExtended));
127 case Type::FP128TyID:
128 return ConstantFP::get(Ty->getContext(),
129 APFloat::getZero(APFloat::IEEEquad));
130 case Type::PPC_FP128TyID:
131 return ConstantFP::get(Ty->getContext(),
132 APFloat(APFloat::PPCDoubleDouble,
133 APInt::getNullValue(128)));
134 case Type::PointerTyID:
135 return ConstantPointerNull::get(cast<PointerType>(Ty));
136 case Type::StructTyID:
137 case Type::ArrayTyID:
138 case Type::VectorTyID:
139 return ConstantAggregateZero::get(Ty);
141 // Function, Label, or Opaque type?
142 llvm_unreachable("Cannot create a null constant of that type!");
146 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
147 Type *ScalarTy = Ty->getScalarType();
149 // Create the base integer constant.
150 Constant *C = ConstantInt::get(Ty->getContext(), V);
152 // Convert an integer to a pointer, if necessary.
153 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
154 C = ConstantExpr::getIntToPtr(C, PTy);
156 // Broadcast a scalar to a vector, if necessary.
157 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
158 C = ConstantVector::getSplat(VTy->getNumElements(), C);
163 Constant *Constant::getAllOnesValue(Type *Ty) {
164 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
165 return ConstantInt::get(Ty->getContext(),
166 APInt::getAllOnesValue(ITy->getBitWidth()));
168 if (Ty->isFloatingPointTy()) {
169 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
170 !Ty->isPPC_FP128Ty());
171 return ConstantFP::get(Ty->getContext(), FL);
174 VectorType *VTy = cast<VectorType>(Ty);
175 return ConstantVector::getSplat(VTy->getNumElements(),
176 getAllOnesValue(VTy->getElementType()));
179 /// getAggregateElement - For aggregates (struct/array/vector) return the
180 /// constant that corresponds to the specified element if possible, or null if
181 /// not. This can return null if the element index is a ConstantExpr, or if
182 /// 'this' is a constant expr.
183 Constant *Constant::getAggregateElement(unsigned Elt) const {
184 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
185 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
187 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
188 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
190 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
191 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
193 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
194 return CAZ->getElementValue(Elt);
196 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
197 return UV->getElementValue(Elt);
199 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
200 return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt) : 0;
204 Constant *Constant::getAggregateElement(Constant *Elt) const {
205 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
206 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
207 return getAggregateElement(CI->getZExtValue());
212 void Constant::destroyConstantImpl() {
213 // When a Constant is destroyed, there may be lingering
214 // references to the constant by other constants in the constant pool. These
215 // constants are implicitly dependent on the module that is being deleted,
216 // but they don't know that. Because we only find out when the CPV is
217 // deleted, we must now notify all of our users (that should only be
218 // Constants) that they are, in fact, invalid now and should be deleted.
220 while (!use_empty()) {
221 Value *V = use_back();
222 #ifndef NDEBUG // Only in -g mode...
223 if (!isa<Constant>(V)) {
224 dbgs() << "While deleting: " << *this
225 << "\n\nUse still stuck around after Def is destroyed: "
229 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
230 cast<Constant>(V)->destroyConstant();
232 // The constant should remove itself from our use list...
233 assert((use_empty() || use_back() != V) && "Constant not removed!");
236 // Value has no outstanding references it is safe to delete it now...
240 static bool canTrapImpl(const Constant *C,
241 SmallPtrSet<const ConstantExpr *, 4> &NonTrappingOps) {
242 assert(C->getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
243 // The only thing that could possibly trap are constant exprs.
244 const ConstantExpr *CE = dyn_cast<ConstantExpr>(C);
248 // ConstantExpr traps if any operands can trap.
249 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
250 if (ConstantExpr *Op = dyn_cast<ConstantExpr>(CE->getOperand(i))) {
251 if (NonTrappingOps.insert(Op) && canTrapImpl(Op, NonTrappingOps))
256 // Otherwise, only specific operations can trap.
257 switch (CE->getOpcode()) {
260 case Instruction::UDiv:
261 case Instruction::SDiv:
262 case Instruction::FDiv:
263 case Instruction::URem:
264 case Instruction::SRem:
265 case Instruction::FRem:
266 // Div and rem can trap if the RHS is not known to be non-zero.
267 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
273 /// canTrap - Return true if evaluation of this constant could trap. This is
274 /// true for things like constant expressions that could divide by zero.
275 bool Constant::canTrap() const {
276 SmallPtrSet<const ConstantExpr *, 4> NonTrappingOps;
277 return canTrapImpl(this, NonTrappingOps);
280 /// isThreadDependent - Return true if the value can vary between threads.
281 bool Constant::isThreadDependent() const {
282 SmallPtrSet<const Constant*, 64> Visited;
283 SmallVector<const Constant*, 64> WorkList;
284 WorkList.push_back(this);
285 Visited.insert(this);
287 while (!WorkList.empty()) {
288 const Constant *C = WorkList.pop_back_val();
290 if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
291 if (GV->isThreadLocal())
295 for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
296 const Constant *D = dyn_cast<Constant>(C->getOperand(I));
299 if (Visited.insert(D))
300 WorkList.push_back(D);
307 /// isConstantUsed - Return true if the constant has users other than constant
308 /// exprs and other dangling things.
309 bool Constant::isConstantUsed() const {
310 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
311 const Constant *UC = dyn_cast<Constant>(*UI);
312 if (UC == 0 || isa<GlobalValue>(UC))
315 if (UC->isConstantUsed())
323 /// getRelocationInfo - This method classifies the entry according to
324 /// whether or not it may generate a relocation entry. This must be
325 /// conservative, so if it might codegen to a relocatable entry, it should say
326 /// so. The return values are:
328 /// NoRelocation: This constant pool entry is guaranteed to never have a
329 /// relocation applied to it (because it holds a simple constant like
331 /// LocalRelocation: This entry has relocations, but the entries are
332 /// guaranteed to be resolvable by the static linker, so the dynamic
333 /// linker will never see them.
334 /// GlobalRelocations: This entry may have arbitrary relocations.
336 /// FIXME: This really should not be in IR.
337 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
338 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
339 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
340 return LocalRelocation; // Local to this file/library.
341 return GlobalRelocations; // Global reference.
344 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
345 return BA->getFunction()->getRelocationInfo();
347 // While raw uses of blockaddress need to be relocated, differences between
348 // two of them don't when they are for labels in the same function. This is a
349 // common idiom when creating a table for the indirect goto extension, so we
350 // handle it efficiently here.
351 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
352 if (CE->getOpcode() == Instruction::Sub) {
353 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
354 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
356 LHS->getOpcode() == Instruction::PtrToInt &&
357 RHS->getOpcode() == Instruction::PtrToInt &&
358 isa<BlockAddress>(LHS->getOperand(0)) &&
359 isa<BlockAddress>(RHS->getOperand(0)) &&
360 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
361 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
365 PossibleRelocationsTy Result = NoRelocation;
366 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
367 Result = std::max(Result,
368 cast<Constant>(getOperand(i))->getRelocationInfo());
373 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
374 /// it. This involves recursively eliminating any dead users of the
376 static bool removeDeadUsersOfConstant(const Constant *C) {
377 if (isa<GlobalValue>(C)) return false; // Cannot remove this
379 while (!C->use_empty()) {
380 const Constant *User = dyn_cast<Constant>(C->use_back());
381 if (!User) return false; // Non-constant usage;
382 if (!removeDeadUsersOfConstant(User))
383 return false; // Constant wasn't dead
386 const_cast<Constant*>(C)->destroyConstant();
391 /// removeDeadConstantUsers - If there are any dead constant users dangling
392 /// off of this constant, remove them. This method is useful for clients
393 /// that want to check to see if a global is unused, but don't want to deal
394 /// with potentially dead constants hanging off of the globals.
395 void Constant::removeDeadConstantUsers() const {
396 Value::const_use_iterator I = use_begin(), E = use_end();
397 Value::const_use_iterator LastNonDeadUser = E;
399 const Constant *User = dyn_cast<Constant>(*I);
406 if (!removeDeadUsersOfConstant(User)) {
407 // If the constant wasn't dead, remember that this was the last live use
408 // and move on to the next constant.
414 // If the constant was dead, then the iterator is invalidated.
415 if (LastNonDeadUser == E) {
427 //===----------------------------------------------------------------------===//
429 //===----------------------------------------------------------------------===//
431 void ConstantInt::anchor() { }
433 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
434 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
435 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
438 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
439 LLVMContextImpl *pImpl = Context.pImpl;
440 if (!pImpl->TheTrueVal)
441 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
442 return pImpl->TheTrueVal;
445 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
446 LLVMContextImpl *pImpl = Context.pImpl;
447 if (!pImpl->TheFalseVal)
448 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
449 return pImpl->TheFalseVal;
452 Constant *ConstantInt::getTrue(Type *Ty) {
453 VectorType *VTy = dyn_cast<VectorType>(Ty);
455 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
456 return ConstantInt::getTrue(Ty->getContext());
458 assert(VTy->getElementType()->isIntegerTy(1) &&
459 "True must be vector of i1 or i1.");
460 return ConstantVector::getSplat(VTy->getNumElements(),
461 ConstantInt::getTrue(Ty->getContext()));
464 Constant *ConstantInt::getFalse(Type *Ty) {
465 VectorType *VTy = dyn_cast<VectorType>(Ty);
467 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
468 return ConstantInt::getFalse(Ty->getContext());
470 assert(VTy->getElementType()->isIntegerTy(1) &&
471 "False must be vector of i1 or i1.");
472 return ConstantVector::getSplat(VTy->getNumElements(),
473 ConstantInt::getFalse(Ty->getContext()));
477 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
478 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
479 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
480 // compare APInt's of different widths, which would violate an APInt class
481 // invariant which generates an assertion.
482 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
483 // Get the corresponding integer type for the bit width of the value.
484 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
485 // get an existing value or the insertion position
486 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
487 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
488 if (!Slot) Slot = new ConstantInt(ITy, V);
492 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
493 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
495 // For vectors, broadcast the value.
496 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
497 return ConstantVector::getSplat(VTy->getNumElements(), C);
502 ConstantInt *ConstantInt::get(IntegerType *Ty, uint64_t V,
504 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
507 ConstantInt *ConstantInt::getSigned(IntegerType *Ty, int64_t V) {
508 return get(Ty, V, true);
511 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
512 return get(Ty, V, true);
515 Constant *ConstantInt::get(Type *Ty, const APInt& V) {
516 ConstantInt *C = get(Ty->getContext(), V);
517 assert(C->getType() == Ty->getScalarType() &&
518 "ConstantInt type doesn't match the type implied by its value!");
520 // For vectors, broadcast the value.
521 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
522 return ConstantVector::getSplat(VTy->getNumElements(), C);
527 ConstantInt *ConstantInt::get(IntegerType* Ty, StringRef Str,
529 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
532 //===----------------------------------------------------------------------===//
534 //===----------------------------------------------------------------------===//
536 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
538 return &APFloat::IEEEhalf;
540 return &APFloat::IEEEsingle;
541 if (Ty->isDoubleTy())
542 return &APFloat::IEEEdouble;
543 if (Ty->isX86_FP80Ty())
544 return &APFloat::x87DoubleExtended;
545 else if (Ty->isFP128Ty())
546 return &APFloat::IEEEquad;
548 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
549 return &APFloat::PPCDoubleDouble;
552 void ConstantFP::anchor() { }
554 /// get() - This returns a constant fp for the specified value in the
555 /// specified type. This should only be used for simple constant values like
556 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
557 Constant *ConstantFP::get(Type *Ty, double V) {
558 LLVMContext &Context = Ty->getContext();
562 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
563 APFloat::rmNearestTiesToEven, &ignored);
564 Constant *C = get(Context, FV);
566 // For vectors, broadcast the value.
567 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
568 return ConstantVector::getSplat(VTy->getNumElements(), C);
574 Constant *ConstantFP::get(Type *Ty, StringRef Str) {
575 LLVMContext &Context = Ty->getContext();
577 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
578 Constant *C = get(Context, FV);
580 // For vectors, broadcast the value.
581 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
582 return ConstantVector::getSplat(VTy->getNumElements(), C);
588 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
589 LLVMContext &Context = Ty->getContext();
590 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
592 return get(Context, apf);
596 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
597 Type *ScalarTy = Ty->getScalarType();
598 if (ScalarTy->isFloatingPointTy()) {
599 Constant *C = getNegativeZero(ScalarTy);
600 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
601 return ConstantVector::getSplat(VTy->getNumElements(), C);
605 return Constant::getNullValue(Ty);
609 // ConstantFP accessors.
610 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
611 DenseMapAPFloatKeyInfo::KeyTy Key(V);
613 LLVMContextImpl* pImpl = Context.pImpl;
615 ConstantFP *&Slot = pImpl->FPConstants[Key];
619 if (&V.getSemantics() == &APFloat::IEEEhalf)
620 Ty = Type::getHalfTy(Context);
621 else if (&V.getSemantics() == &APFloat::IEEEsingle)
622 Ty = Type::getFloatTy(Context);
623 else if (&V.getSemantics() == &APFloat::IEEEdouble)
624 Ty = Type::getDoubleTy(Context);
625 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
626 Ty = Type::getX86_FP80Ty(Context);
627 else if (&V.getSemantics() == &APFloat::IEEEquad)
628 Ty = Type::getFP128Ty(Context);
630 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
631 "Unknown FP format");
632 Ty = Type::getPPC_FP128Ty(Context);
634 Slot = new ConstantFP(Ty, V);
640 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
641 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
642 return ConstantFP::get(Ty->getContext(),
643 APFloat::getInf(Semantics, Negative));
646 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
647 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
648 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
652 bool ConstantFP::isExactlyValue(const APFloat &V) const {
653 return Val.bitwiseIsEqual(V);
656 //===----------------------------------------------------------------------===//
657 // ConstantAggregateZero Implementation
658 //===----------------------------------------------------------------------===//
660 /// getSequentialElement - If this CAZ has array or vector type, return a zero
661 /// with the right element type.
662 Constant *ConstantAggregateZero::getSequentialElement() const {
663 return Constant::getNullValue(getType()->getSequentialElementType());
666 /// getStructElement - If this CAZ has struct type, return a zero with the
667 /// right element type for the specified element.
668 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
669 return Constant::getNullValue(getType()->getStructElementType(Elt));
672 /// getElementValue - Return a zero of the right value for the specified GEP
673 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
674 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
675 if (isa<SequentialType>(getType()))
676 return getSequentialElement();
677 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
680 /// getElementValue - Return a zero of the right value for the specified GEP
682 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
683 if (isa<SequentialType>(getType()))
684 return getSequentialElement();
685 return getStructElement(Idx);
689 //===----------------------------------------------------------------------===//
690 // UndefValue Implementation
691 //===----------------------------------------------------------------------===//
693 /// getSequentialElement - If this undef has array or vector type, return an
694 /// undef with the right element type.
695 UndefValue *UndefValue::getSequentialElement() const {
696 return UndefValue::get(getType()->getSequentialElementType());
699 /// getStructElement - If this undef has struct type, return a zero with the
700 /// right element type for the specified element.
701 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
702 return UndefValue::get(getType()->getStructElementType(Elt));
705 /// getElementValue - Return an undef of the right value for the specified GEP
706 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
707 UndefValue *UndefValue::getElementValue(Constant *C) const {
708 if (isa<SequentialType>(getType()))
709 return getSequentialElement();
710 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
713 /// getElementValue - Return an undef of the right value for the specified GEP
715 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
716 if (isa<SequentialType>(getType()))
717 return getSequentialElement();
718 return getStructElement(Idx);
723 //===----------------------------------------------------------------------===//
724 // ConstantXXX Classes
725 //===----------------------------------------------------------------------===//
727 template <typename ItTy, typename EltTy>
728 static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
729 for (; Start != End; ++Start)
735 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
736 : Constant(T, ConstantArrayVal,
737 OperandTraits<ConstantArray>::op_end(this) - V.size(),
739 assert(V.size() == T->getNumElements() &&
740 "Invalid initializer vector for constant array");
741 for (unsigned i = 0, e = V.size(); i != e; ++i)
742 assert(V[i]->getType() == T->getElementType() &&
743 "Initializer for array element doesn't match array element type!");
744 std::copy(V.begin(), V.end(), op_begin());
747 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
748 // Empty arrays are canonicalized to ConstantAggregateZero.
750 return ConstantAggregateZero::get(Ty);
752 for (unsigned i = 0, e = V.size(); i != e; ++i) {
753 assert(V[i]->getType() == Ty->getElementType() &&
754 "Wrong type in array element initializer");
756 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
758 // If this is an all-zero array, return a ConstantAggregateZero object. If
759 // all undef, return an UndefValue, if "all simple", then return a
760 // ConstantDataArray.
762 if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
763 return UndefValue::get(Ty);
765 if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
766 return ConstantAggregateZero::get(Ty);
768 // Check to see if all of the elements are ConstantFP or ConstantInt and if
769 // the element type is compatible with ConstantDataVector. If so, use it.
770 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
771 // We speculatively build the elements here even if it turns out that there
772 // is a constantexpr or something else weird in the array, since it is so
773 // uncommon for that to happen.
774 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
775 if (CI->getType()->isIntegerTy(8)) {
776 SmallVector<uint8_t, 16> Elts;
777 for (unsigned i = 0, e = V.size(); i != e; ++i)
778 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
779 Elts.push_back(CI->getZExtValue());
782 if (Elts.size() == V.size())
783 return ConstantDataArray::get(C->getContext(), Elts);
784 } else if (CI->getType()->isIntegerTy(16)) {
785 SmallVector<uint16_t, 16> Elts;
786 for (unsigned i = 0, e = V.size(); i != e; ++i)
787 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
788 Elts.push_back(CI->getZExtValue());
791 if (Elts.size() == V.size())
792 return ConstantDataArray::get(C->getContext(), Elts);
793 } else if (CI->getType()->isIntegerTy(32)) {
794 SmallVector<uint32_t, 16> Elts;
795 for (unsigned i = 0, e = V.size(); i != e; ++i)
796 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
797 Elts.push_back(CI->getZExtValue());
800 if (Elts.size() == V.size())
801 return ConstantDataArray::get(C->getContext(), Elts);
802 } else if (CI->getType()->isIntegerTy(64)) {
803 SmallVector<uint64_t, 16> Elts;
804 for (unsigned i = 0, e = V.size(); i != e; ++i)
805 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
806 Elts.push_back(CI->getZExtValue());
809 if (Elts.size() == V.size())
810 return ConstantDataArray::get(C->getContext(), Elts);
814 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
815 if (CFP->getType()->isFloatTy()) {
816 SmallVector<float, 16> Elts;
817 for (unsigned i = 0, e = V.size(); i != e; ++i)
818 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
819 Elts.push_back(CFP->getValueAPF().convertToFloat());
822 if (Elts.size() == V.size())
823 return ConstantDataArray::get(C->getContext(), Elts);
824 } else if (CFP->getType()->isDoubleTy()) {
825 SmallVector<double, 16> Elts;
826 for (unsigned i = 0, e = V.size(); i != e; ++i)
827 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
828 Elts.push_back(CFP->getValueAPF().convertToDouble());
831 if (Elts.size() == V.size())
832 return ConstantDataArray::get(C->getContext(), Elts);
837 // Otherwise, we really do want to create a ConstantArray.
838 return pImpl->ArrayConstants.getOrCreate(Ty, V);
841 /// getTypeForElements - Return an anonymous struct type to use for a constant
842 /// with the specified set of elements. The list must not be empty.
843 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
844 ArrayRef<Constant*> V,
846 unsigned VecSize = V.size();
847 SmallVector<Type*, 16> EltTypes(VecSize);
848 for (unsigned i = 0; i != VecSize; ++i)
849 EltTypes[i] = V[i]->getType();
851 return StructType::get(Context, EltTypes, Packed);
855 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
858 "ConstantStruct::getTypeForElements cannot be called on empty list");
859 return getTypeForElements(V[0]->getContext(), V, Packed);
863 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
864 : Constant(T, ConstantStructVal,
865 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
867 assert(V.size() == T->getNumElements() &&
868 "Invalid initializer vector for constant structure");
869 for (unsigned i = 0, e = V.size(); i != e; ++i)
870 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
871 "Initializer for struct element doesn't match struct element type!");
872 std::copy(V.begin(), V.end(), op_begin());
875 // ConstantStruct accessors.
876 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
877 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
878 "Incorrect # elements specified to ConstantStruct::get");
880 // Create a ConstantAggregateZero value if all elements are zeros.
882 bool isUndef = false;
885 isUndef = isa<UndefValue>(V[0]);
886 isZero = V[0]->isNullValue();
887 if (isUndef || isZero) {
888 for (unsigned i = 0, e = V.size(); i != e; ++i) {
889 if (!V[i]->isNullValue())
891 if (!isa<UndefValue>(V[i]))
897 return ConstantAggregateZero::get(ST);
899 return UndefValue::get(ST);
901 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
904 Constant *ConstantStruct::get(StructType *T, ...) {
906 SmallVector<Constant*, 8> Values;
908 while (Constant *Val = va_arg(ap, llvm::Constant*))
909 Values.push_back(Val);
911 return get(T, Values);
914 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
915 : Constant(T, ConstantVectorVal,
916 OperandTraits<ConstantVector>::op_end(this) - V.size(),
918 for (size_t i = 0, e = V.size(); i != e; i++)
919 assert(V[i]->getType() == T->getElementType() &&
920 "Initializer for vector element doesn't match vector element type!");
921 std::copy(V.begin(), V.end(), op_begin());
924 // ConstantVector accessors.
925 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
926 assert(!V.empty() && "Vectors can't be empty");
927 VectorType *T = VectorType::get(V.front()->getType(), V.size());
928 LLVMContextImpl *pImpl = T->getContext().pImpl;
930 // If this is an all-undef or all-zero vector, return a
931 // ConstantAggregateZero or UndefValue.
933 bool isZero = C->isNullValue();
934 bool isUndef = isa<UndefValue>(C);
936 if (isZero || isUndef) {
937 for (unsigned i = 1, e = V.size(); i != e; ++i)
939 isZero = isUndef = false;
945 return ConstantAggregateZero::get(T);
947 return UndefValue::get(T);
949 // Check to see if all of the elements are ConstantFP or ConstantInt and if
950 // the element type is compatible with ConstantDataVector. If so, use it.
951 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
952 // We speculatively build the elements here even if it turns out that there
953 // is a constantexpr or something else weird in the array, since it is so
954 // uncommon for that to happen.
955 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
956 if (CI->getType()->isIntegerTy(8)) {
957 SmallVector<uint8_t, 16> Elts;
958 for (unsigned i = 0, e = V.size(); i != e; ++i)
959 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
960 Elts.push_back(CI->getZExtValue());
963 if (Elts.size() == V.size())
964 return ConstantDataVector::get(C->getContext(), Elts);
965 } else if (CI->getType()->isIntegerTy(16)) {
966 SmallVector<uint16_t, 16> Elts;
967 for (unsigned i = 0, e = V.size(); i != e; ++i)
968 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
969 Elts.push_back(CI->getZExtValue());
972 if (Elts.size() == V.size())
973 return ConstantDataVector::get(C->getContext(), Elts);
974 } else if (CI->getType()->isIntegerTy(32)) {
975 SmallVector<uint32_t, 16> Elts;
976 for (unsigned i = 0, e = V.size(); i != e; ++i)
977 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
978 Elts.push_back(CI->getZExtValue());
981 if (Elts.size() == V.size())
982 return ConstantDataVector::get(C->getContext(), Elts);
983 } else if (CI->getType()->isIntegerTy(64)) {
984 SmallVector<uint64_t, 16> Elts;
985 for (unsigned i = 0, e = V.size(); i != e; ++i)
986 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
987 Elts.push_back(CI->getZExtValue());
990 if (Elts.size() == V.size())
991 return ConstantDataVector::get(C->getContext(), Elts);
995 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
996 if (CFP->getType()->isFloatTy()) {
997 SmallVector<float, 16> Elts;
998 for (unsigned i = 0, e = V.size(); i != e; ++i)
999 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1000 Elts.push_back(CFP->getValueAPF().convertToFloat());
1003 if (Elts.size() == V.size())
1004 return ConstantDataVector::get(C->getContext(), Elts);
1005 } else if (CFP->getType()->isDoubleTy()) {
1006 SmallVector<double, 16> Elts;
1007 for (unsigned i = 0, e = V.size(); i != e; ++i)
1008 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
1009 Elts.push_back(CFP->getValueAPF().convertToDouble());
1012 if (Elts.size() == V.size())
1013 return ConstantDataVector::get(C->getContext(), Elts);
1018 // Otherwise, the element type isn't compatible with ConstantDataVector, or
1019 // the operand list constants a ConstantExpr or something else strange.
1020 return pImpl->VectorConstants.getOrCreate(T, V);
1023 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
1024 // If this splat is compatible with ConstantDataVector, use it instead of
1026 if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
1027 ConstantDataSequential::isElementTypeCompatible(V->getType()))
1028 return ConstantDataVector::getSplat(NumElts, V);
1030 SmallVector<Constant*, 32> Elts(NumElts, V);
1035 // Utility function for determining if a ConstantExpr is a CastOp or not. This
1036 // can't be inline because we don't want to #include Instruction.h into
1038 bool ConstantExpr::isCast() const {
1039 return Instruction::isCast(getOpcode());
1042 bool ConstantExpr::isCompare() const {
1043 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
1046 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
1047 if (getOpcode() != Instruction::GetElementPtr) return false;
1049 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
1050 User::const_op_iterator OI = llvm::next(this->op_begin());
1052 // Skip the first index, as it has no static limit.
1056 // The remaining indices must be compile-time known integers within the
1057 // bounds of the corresponding notional static array types.
1058 for (; GEPI != E; ++GEPI, ++OI) {
1059 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
1060 if (!CI) return false;
1061 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
1062 if (CI->getValue().getActiveBits() > 64 ||
1063 CI->getZExtValue() >= ATy->getNumElements())
1067 // All the indices checked out.
1071 bool ConstantExpr::hasIndices() const {
1072 return getOpcode() == Instruction::ExtractValue ||
1073 getOpcode() == Instruction::InsertValue;
1076 ArrayRef<unsigned> ConstantExpr::getIndices() const {
1077 if (const ExtractValueConstantExpr *EVCE =
1078 dyn_cast<ExtractValueConstantExpr>(this))
1079 return EVCE->Indices;
1081 return cast<InsertValueConstantExpr>(this)->Indices;
1084 unsigned ConstantExpr::getPredicate() const {
1085 assert(isCompare());
1086 return ((const CompareConstantExpr*)this)->predicate;
1089 /// getWithOperandReplaced - Return a constant expression identical to this
1090 /// one, but with the specified operand set to the specified value.
1092 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
1093 assert(Op->getType() == getOperand(OpNo)->getType() &&
1094 "Replacing operand with value of different type!");
1095 if (getOperand(OpNo) == Op)
1096 return const_cast<ConstantExpr*>(this);
1098 SmallVector<Constant*, 8> NewOps;
1099 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1100 NewOps.push_back(i == OpNo ? Op : getOperand(i));
1102 return getWithOperands(NewOps);
1105 /// getWithOperands - This returns the current constant expression with the
1106 /// operands replaced with the specified values. The specified array must
1107 /// have the same number of operands as our current one.
1108 Constant *ConstantExpr::
1109 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
1110 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
1111 bool AnyChange = Ty != getType();
1112 for (unsigned i = 0; i != Ops.size(); ++i)
1113 AnyChange |= Ops[i] != getOperand(i);
1115 if (!AnyChange) // No operands changed, return self.
1116 return const_cast<ConstantExpr*>(this);
1118 switch (getOpcode()) {
1119 case Instruction::Trunc:
1120 case Instruction::ZExt:
1121 case Instruction::SExt:
1122 case Instruction::FPTrunc:
1123 case Instruction::FPExt:
1124 case Instruction::UIToFP:
1125 case Instruction::SIToFP:
1126 case Instruction::FPToUI:
1127 case Instruction::FPToSI:
1128 case Instruction::PtrToInt:
1129 case Instruction::IntToPtr:
1130 case Instruction::BitCast:
1131 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
1132 case Instruction::Select:
1133 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
1134 case Instruction::InsertElement:
1135 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1136 case Instruction::ExtractElement:
1137 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1138 case Instruction::InsertValue:
1139 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices());
1140 case Instruction::ExtractValue:
1141 return ConstantExpr::getExtractValue(Ops[0], getIndices());
1142 case Instruction::ShuffleVector:
1143 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1144 case Instruction::GetElementPtr:
1145 return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1146 cast<GEPOperator>(this)->isInBounds());
1147 case Instruction::ICmp:
1148 case Instruction::FCmp:
1149 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1151 assert(getNumOperands() == 2 && "Must be binary operator?");
1152 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1157 //===----------------------------------------------------------------------===//
1158 // isValueValidForType implementations
1160 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1161 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1162 if (Ty->isIntegerTy(1))
1163 return Val == 0 || Val == 1;
1165 return true; // always true, has to fit in largest type
1166 uint64_t Max = (1ll << NumBits) - 1;
1170 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1171 unsigned NumBits = Ty->getIntegerBitWidth();
1172 if (Ty->isIntegerTy(1))
1173 return Val == 0 || Val == 1 || Val == -1;
1175 return true; // always true, has to fit in largest type
1176 int64_t Min = -(1ll << (NumBits-1));
1177 int64_t Max = (1ll << (NumBits-1)) - 1;
1178 return (Val >= Min && Val <= Max);
1181 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1182 // convert modifies in place, so make a copy.
1183 APFloat Val2 = APFloat(Val);
1185 switch (Ty->getTypeID()) {
1187 return false; // These can't be represented as floating point!
1189 // FIXME rounding mode needs to be more flexible
1190 case Type::HalfTyID: {
1191 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1193 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1196 case Type::FloatTyID: {
1197 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1199 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1202 case Type::DoubleTyID: {
1203 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1204 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1205 &Val2.getSemantics() == &APFloat::IEEEdouble)
1207 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1210 case Type::X86_FP80TyID:
1211 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1212 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1213 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1214 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1215 case Type::FP128TyID:
1216 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1217 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1218 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1219 &Val2.getSemantics() == &APFloat::IEEEquad;
1220 case Type::PPC_FP128TyID:
1221 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1222 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1223 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1224 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1229 //===----------------------------------------------------------------------===//
1230 // Factory Function Implementation
1232 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1233 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1234 "Cannot create an aggregate zero of non-aggregate type!");
1236 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1238 Entry = new ConstantAggregateZero(Ty);
1243 /// destroyConstant - Remove the constant from the constant table.
1245 void ConstantAggregateZero::destroyConstant() {
1246 getContext().pImpl->CAZConstants.erase(getType());
1247 destroyConstantImpl();
1250 /// destroyConstant - Remove the constant from the constant table...
1252 void ConstantArray::destroyConstant() {
1253 getType()->getContext().pImpl->ArrayConstants.remove(this);
1254 destroyConstantImpl();
1258 //---- ConstantStruct::get() implementation...
1261 // destroyConstant - Remove the constant from the constant table...
1263 void ConstantStruct::destroyConstant() {
1264 getType()->getContext().pImpl->StructConstants.remove(this);
1265 destroyConstantImpl();
1268 // destroyConstant - Remove the constant from the constant table...
1270 void ConstantVector::destroyConstant() {
1271 getType()->getContext().pImpl->VectorConstants.remove(this);
1272 destroyConstantImpl();
1275 /// getSplatValue - If this is a splat vector constant, meaning that all of
1276 /// the elements have the same value, return that value. Otherwise return 0.
1277 Constant *Constant::getSplatValue() const {
1278 assert(this->getType()->isVectorTy() && "Only valid for vectors!");
1279 if (isa<ConstantAggregateZero>(this))
1280 return getNullValue(this->getType()->getVectorElementType());
1281 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
1282 return CV->getSplatValue();
1283 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
1284 return CV->getSplatValue();
1288 /// getSplatValue - If this is a splat constant, where all of the
1289 /// elements have the same value, return that value. Otherwise return null.
1290 Constant *ConstantVector::getSplatValue() const {
1291 // Check out first element.
1292 Constant *Elt = getOperand(0);
1293 // Then make sure all remaining elements point to the same value.
1294 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1295 if (getOperand(I) != Elt)
1300 /// If C is a constant integer then return its value, otherwise C must be a
1301 /// vector of constant integers, all equal, and the common value is returned.
1302 const APInt &Constant::getUniqueInteger() const {
1303 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
1304 return CI->getValue();
1305 assert(this->getSplatValue() && "Doesn't contain a unique integer!");
1306 const Constant *C = this->getAggregateElement(0U);
1307 assert(C && isa<ConstantInt>(C) && "Not a vector of numbers!");
1308 return cast<ConstantInt>(C)->getValue();
1312 //---- ConstantPointerNull::get() implementation.
1315 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1316 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1318 Entry = new ConstantPointerNull(Ty);
1323 // destroyConstant - Remove the constant from the constant table...
1325 void ConstantPointerNull::destroyConstant() {
1326 getContext().pImpl->CPNConstants.erase(getType());
1327 // Free the constant and any dangling references to it.
1328 destroyConstantImpl();
1332 //---- UndefValue::get() implementation.
1335 UndefValue *UndefValue::get(Type *Ty) {
1336 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1338 Entry = new UndefValue(Ty);
1343 // destroyConstant - Remove the constant from the constant table.
1345 void UndefValue::destroyConstant() {
1346 // Free the constant and any dangling references to it.
1347 getContext().pImpl->UVConstants.erase(getType());
1348 destroyConstantImpl();
1351 //---- BlockAddress::get() implementation.
1354 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1355 assert(BB->getParent() != 0 && "Block must have a parent");
1356 return get(BB->getParent(), BB);
1359 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1361 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1363 BA = new BlockAddress(F, BB);
1365 assert(BA->getFunction() == F && "Basic block moved between functions");
1369 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1370 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1374 BB->AdjustBlockAddressRefCount(1);
1378 // destroyConstant - Remove the constant from the constant table.
1380 void BlockAddress::destroyConstant() {
1381 getFunction()->getType()->getContext().pImpl
1382 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1383 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1384 destroyConstantImpl();
1387 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1388 // This could be replacing either the Basic Block or the Function. In either
1389 // case, we have to remove the map entry.
1390 Function *NewF = getFunction();
1391 BasicBlock *NewBB = getBasicBlock();
1394 NewF = cast<Function>(To);
1396 NewBB = cast<BasicBlock>(To);
1398 // See if the 'new' entry already exists, if not, just update this in place
1399 // and return early.
1400 BlockAddress *&NewBA =
1401 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1403 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1405 // Remove the old entry, this can't cause the map to rehash (just a
1406 // tombstone will get added).
1407 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1410 setOperand(0, NewF);
1411 setOperand(1, NewBB);
1412 getBasicBlock()->AdjustBlockAddressRefCount(1);
1416 // Otherwise, I do need to replace this with an existing value.
1417 assert(NewBA != this && "I didn't contain From!");
1419 // Everyone using this now uses the replacement.
1420 replaceAllUsesWith(NewBA);
1425 //---- ConstantExpr::get() implementations.
1428 /// This is a utility function to handle folding of casts and lookup of the
1429 /// cast in the ExprConstants map. It is used by the various get* methods below.
1430 static inline Constant *getFoldedCast(
1431 Instruction::CastOps opc, Constant *C, Type *Ty) {
1432 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1433 // Fold a few common cases
1434 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1437 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1439 // Look up the constant in the table first to ensure uniqueness.
1440 ExprMapKeyType Key(opc, C);
1442 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1445 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1446 Instruction::CastOps opc = Instruction::CastOps(oc);
1447 assert(Instruction::isCast(opc) && "opcode out of range");
1448 assert(C && Ty && "Null arguments to getCast");
1449 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1453 llvm_unreachable("Invalid cast opcode");
1454 case Instruction::Trunc: return getTrunc(C, Ty);
1455 case Instruction::ZExt: return getZExt(C, Ty);
1456 case Instruction::SExt: return getSExt(C, Ty);
1457 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1458 case Instruction::FPExt: return getFPExtend(C, Ty);
1459 case Instruction::UIToFP: return getUIToFP(C, Ty);
1460 case Instruction::SIToFP: return getSIToFP(C, Ty);
1461 case Instruction::FPToUI: return getFPToUI(C, Ty);
1462 case Instruction::FPToSI: return getFPToSI(C, Ty);
1463 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1464 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1465 case Instruction::BitCast: return getBitCast(C, Ty);
1469 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1470 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1471 return getBitCast(C, Ty);
1472 return getZExt(C, Ty);
1475 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1476 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1477 return getBitCast(C, Ty);
1478 return getSExt(C, Ty);
1481 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1482 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1483 return getBitCast(C, Ty);
1484 return getTrunc(C, Ty);
1487 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1488 assert(S->getType()->isPtrOrPtrVectorTy() && "Invalid cast");
1489 assert((Ty->isIntOrIntVectorTy() || Ty->isPtrOrPtrVectorTy()) &&
1492 if (Ty->isIntOrIntVectorTy())
1493 return getPtrToInt(S, Ty);
1494 return getBitCast(S, Ty);
1497 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1499 assert(C->getType()->isIntOrIntVectorTy() &&
1500 Ty->isIntOrIntVectorTy() && "Invalid cast");
1501 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1502 unsigned DstBits = Ty->getScalarSizeInBits();
1503 Instruction::CastOps opcode =
1504 (SrcBits == DstBits ? Instruction::BitCast :
1505 (SrcBits > DstBits ? Instruction::Trunc :
1506 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1507 return getCast(opcode, C, Ty);
1510 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1511 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1513 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1514 unsigned DstBits = Ty->getScalarSizeInBits();
1515 if (SrcBits == DstBits)
1516 return C; // Avoid a useless cast
1517 Instruction::CastOps opcode =
1518 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1519 return getCast(opcode, C, Ty);
1522 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1524 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1525 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1527 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1528 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1529 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1530 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1531 "SrcTy must be larger than DestTy for Trunc!");
1533 return getFoldedCast(Instruction::Trunc, C, Ty);
1536 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1538 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1539 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1541 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1542 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1543 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1544 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1545 "SrcTy must be smaller than DestTy for SExt!");
1547 return getFoldedCast(Instruction::SExt, C, Ty);
1550 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1552 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1553 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1555 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1556 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1557 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1558 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1559 "SrcTy must be smaller than DestTy for ZExt!");
1561 return getFoldedCast(Instruction::ZExt, C, Ty);
1564 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1566 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1567 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1569 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1570 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1571 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1572 "This is an illegal floating point truncation!");
1573 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1576 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1578 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1579 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1581 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1582 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1583 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1584 "This is an illegal floating point extension!");
1585 return getFoldedCast(Instruction::FPExt, C, Ty);
1588 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1590 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1591 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1593 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1594 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1595 "This is an illegal uint to floating point cast!");
1596 return getFoldedCast(Instruction::UIToFP, C, Ty);
1599 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1601 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1602 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1604 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1605 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1606 "This is an illegal sint to floating point cast!");
1607 return getFoldedCast(Instruction::SIToFP, C, Ty);
1610 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1612 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1613 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1615 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1616 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1617 "This is an illegal floating point to uint cast!");
1618 return getFoldedCast(Instruction::FPToUI, C, Ty);
1621 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1623 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1624 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1626 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1627 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1628 "This is an illegal floating point to sint cast!");
1629 return getFoldedCast(Instruction::FPToSI, C, Ty);
1632 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1633 assert(C->getType()->getScalarType()->isPointerTy() &&
1634 "PtrToInt source must be pointer or pointer vector");
1635 assert(DstTy->getScalarType()->isIntegerTy() &&
1636 "PtrToInt destination must be integer or integer vector");
1637 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1638 if (isa<VectorType>(C->getType()))
1639 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1640 "Invalid cast between a different number of vector elements");
1641 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1644 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1645 assert(C->getType()->getScalarType()->isIntegerTy() &&
1646 "IntToPtr source must be integer or integer vector");
1647 assert(DstTy->getScalarType()->isPointerTy() &&
1648 "IntToPtr destination must be a pointer or pointer vector");
1649 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1650 if (isa<VectorType>(C->getType()))
1651 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1652 "Invalid cast between a different number of vector elements");
1653 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1656 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1657 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1658 "Invalid constantexpr bitcast!");
1660 // It is common to ask for a bitcast of a value to its own type, handle this
1662 if (C->getType() == DstTy) return C;
1664 return getFoldedCast(Instruction::BitCast, C, DstTy);
1667 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1669 // Check the operands for consistency first.
1670 assert(Opcode >= Instruction::BinaryOpsBegin &&
1671 Opcode < Instruction::BinaryOpsEnd &&
1672 "Invalid opcode in binary constant expression");
1673 assert(C1->getType() == C2->getType() &&
1674 "Operand types in binary constant expression should match");
1678 case Instruction::Add:
1679 case Instruction::Sub:
1680 case Instruction::Mul:
1681 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1682 assert(C1->getType()->isIntOrIntVectorTy() &&
1683 "Tried to create an integer operation on a non-integer type!");
1685 case Instruction::FAdd:
1686 case Instruction::FSub:
1687 case Instruction::FMul:
1688 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1689 assert(C1->getType()->isFPOrFPVectorTy() &&
1690 "Tried to create a floating-point operation on a "
1691 "non-floating-point type!");
1693 case Instruction::UDiv:
1694 case Instruction::SDiv:
1695 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1696 assert(C1->getType()->isIntOrIntVectorTy() &&
1697 "Tried to create an arithmetic operation on a non-arithmetic type!");
1699 case Instruction::FDiv:
1700 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1701 assert(C1->getType()->isFPOrFPVectorTy() &&
1702 "Tried to create an arithmetic operation on a non-arithmetic type!");
1704 case Instruction::URem:
1705 case Instruction::SRem:
1706 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1707 assert(C1->getType()->isIntOrIntVectorTy() &&
1708 "Tried to create an arithmetic operation on a non-arithmetic type!");
1710 case Instruction::FRem:
1711 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1712 assert(C1->getType()->isFPOrFPVectorTy() &&
1713 "Tried to create an arithmetic operation on a non-arithmetic type!");
1715 case Instruction::And:
1716 case Instruction::Or:
1717 case Instruction::Xor:
1718 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1719 assert(C1->getType()->isIntOrIntVectorTy() &&
1720 "Tried to create a logical operation on a non-integral type!");
1722 case Instruction::Shl:
1723 case Instruction::LShr:
1724 case Instruction::AShr:
1725 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1726 assert(C1->getType()->isIntOrIntVectorTy() &&
1727 "Tried to create a shift operation on a non-integer type!");
1734 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1735 return FC; // Fold a few common cases.
1737 Constant *ArgVec[] = { C1, C2 };
1738 ExprMapKeyType Key(Opcode, ArgVec, 0, Flags);
1740 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1741 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1744 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1745 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1746 // Note that a non-inbounds gep is used, as null isn't within any object.
1747 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1748 Constant *GEP = getGetElementPtr(
1749 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1750 return getPtrToInt(GEP,
1751 Type::getInt64Ty(Ty->getContext()));
1754 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1755 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1756 // Note that a non-inbounds gep is used, as null isn't within any object.
1758 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1759 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1760 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1761 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1762 Constant *Indices[2] = { Zero, One };
1763 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1764 return getPtrToInt(GEP,
1765 Type::getInt64Ty(Ty->getContext()));
1768 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1769 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1773 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1774 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1775 // Note that a non-inbounds gep is used, as null isn't within any object.
1776 Constant *GEPIdx[] = {
1777 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1780 Constant *GEP = getGetElementPtr(
1781 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1782 return getPtrToInt(GEP,
1783 Type::getInt64Ty(Ty->getContext()));
1786 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1787 Constant *C1, Constant *C2) {
1788 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1790 switch (Predicate) {
1791 default: llvm_unreachable("Invalid CmpInst predicate");
1792 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1793 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1794 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1795 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1796 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1797 case CmpInst::FCMP_TRUE:
1798 return getFCmp(Predicate, C1, C2);
1800 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1801 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1802 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1803 case CmpInst::ICMP_SLE:
1804 return getICmp(Predicate, C1, C2);
1808 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1809 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1811 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1812 return SC; // Fold common cases
1814 Constant *ArgVec[] = { C, V1, V2 };
1815 ExprMapKeyType Key(Instruction::Select, ArgVec);
1817 LLVMContextImpl *pImpl = C->getContext().pImpl;
1818 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1821 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1823 assert(C->getType()->isPtrOrPtrVectorTy() &&
1824 "Non-pointer type for constant GetElementPtr expression");
1826 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1827 return FC; // Fold a few common cases.
1829 // Get the result type of the getelementptr!
1830 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1831 assert(Ty && "GEP indices invalid!");
1832 unsigned AS = C->getType()->getPointerAddressSpace();
1833 Type *ReqTy = Ty->getPointerTo(AS);
1834 if (VectorType *VecTy = dyn_cast<VectorType>(C->getType()))
1835 ReqTy = VectorType::get(ReqTy, VecTy->getNumElements());
1837 // Look up the constant in the table first to ensure uniqueness
1838 std::vector<Constant*> ArgVec;
1839 ArgVec.reserve(1 + Idxs.size());
1840 ArgVec.push_back(C);
1841 for (unsigned i = 0, e = Idxs.size(); i != e; ++i) {
1842 assert(Idxs[i]->getType()->isVectorTy() == ReqTy->isVectorTy() &&
1843 "getelementptr index type missmatch");
1844 assert((!Idxs[i]->getType()->isVectorTy() ||
1845 ReqTy->getVectorNumElements() ==
1846 Idxs[i]->getType()->getVectorNumElements()) &&
1847 "getelementptr index type missmatch");
1848 ArgVec.push_back(cast<Constant>(Idxs[i]));
1850 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1851 InBounds ? GEPOperator::IsInBounds : 0);
1853 LLVMContextImpl *pImpl = C->getContext().pImpl;
1854 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1858 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1859 assert(LHS->getType() == RHS->getType());
1860 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1861 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1863 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1864 return FC; // Fold a few common cases...
1866 // Look up the constant in the table first to ensure uniqueness
1867 Constant *ArgVec[] = { LHS, RHS };
1868 // Get the key type with both the opcode and predicate
1869 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1871 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1872 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1873 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1875 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1876 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1880 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1881 assert(LHS->getType() == RHS->getType());
1882 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1884 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1885 return FC; // Fold a few common cases...
1887 // Look up the constant in the table first to ensure uniqueness
1888 Constant *ArgVec[] = { LHS, RHS };
1889 // Get the key type with both the opcode and predicate
1890 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1892 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1893 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1894 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1896 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1897 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1900 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1901 assert(Val->getType()->isVectorTy() &&
1902 "Tried to create extractelement operation on non-vector type!");
1903 assert(Idx->getType()->isIntegerTy(32) &&
1904 "Extractelement index must be i32 type!");
1906 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1907 return FC; // Fold a few common cases.
1909 // Look up the constant in the table first to ensure uniqueness
1910 Constant *ArgVec[] = { Val, Idx };
1911 const ExprMapKeyType Key(Instruction::ExtractElement, ArgVec);
1913 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1914 Type *ReqTy = Val->getType()->getVectorElementType();
1915 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1918 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1920 assert(Val->getType()->isVectorTy() &&
1921 "Tried to create insertelement operation on non-vector type!");
1922 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1923 "Insertelement types must match!");
1924 assert(Idx->getType()->isIntegerTy(32) &&
1925 "Insertelement index must be i32 type!");
1927 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1928 return FC; // Fold a few common cases.
1929 // Look up the constant in the table first to ensure uniqueness
1930 Constant *ArgVec[] = { Val, Elt, Idx };
1931 const ExprMapKeyType Key(Instruction::InsertElement, ArgVec);
1933 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1934 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1937 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1939 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1940 "Invalid shuffle vector constant expr operands!");
1942 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1943 return FC; // Fold a few common cases.
1945 unsigned NElts = Mask->getType()->getVectorNumElements();
1946 Type *EltTy = V1->getType()->getVectorElementType();
1947 Type *ShufTy = VectorType::get(EltTy, NElts);
1949 // Look up the constant in the table first to ensure uniqueness
1950 Constant *ArgVec[] = { V1, V2, Mask };
1951 const ExprMapKeyType Key(Instruction::ShuffleVector, ArgVec);
1953 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1954 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1957 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1958 ArrayRef<unsigned> Idxs) {
1959 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1960 Idxs) == Val->getType() &&
1961 "insertvalue indices invalid!");
1962 assert(Agg->getType()->isFirstClassType() &&
1963 "Non-first-class type for constant insertvalue expression");
1964 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1965 assert(FC && "insertvalue constant expr couldn't be folded!");
1969 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1970 ArrayRef<unsigned> Idxs) {
1971 assert(Agg->getType()->isFirstClassType() &&
1972 "Tried to create extractelement operation on non-first-class type!");
1974 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1976 assert(ReqTy && "extractvalue indices invalid!");
1978 assert(Agg->getType()->isFirstClassType() &&
1979 "Non-first-class type for constant extractvalue expression");
1980 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1981 assert(FC && "ExtractValue constant expr couldn't be folded!");
1985 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1986 assert(C->getType()->isIntOrIntVectorTy() &&
1987 "Cannot NEG a nonintegral value!");
1988 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1992 Constant *ConstantExpr::getFNeg(Constant *C) {
1993 assert(C->getType()->isFPOrFPVectorTy() &&
1994 "Cannot FNEG a non-floating-point value!");
1995 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1998 Constant *ConstantExpr::getNot(Constant *C) {
1999 assert(C->getType()->isIntOrIntVectorTy() &&
2000 "Cannot NOT a nonintegral value!");
2001 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
2004 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
2005 bool HasNUW, bool HasNSW) {
2006 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2007 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2008 return get(Instruction::Add, C1, C2, Flags);
2011 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
2012 return get(Instruction::FAdd, C1, C2);
2015 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
2016 bool HasNUW, bool HasNSW) {
2017 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2018 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2019 return get(Instruction::Sub, C1, C2, Flags);
2022 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
2023 return get(Instruction::FSub, C1, C2);
2026 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
2027 bool HasNUW, bool HasNSW) {
2028 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2029 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2030 return get(Instruction::Mul, C1, C2, Flags);
2033 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
2034 return get(Instruction::FMul, C1, C2);
2037 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
2038 return get(Instruction::UDiv, C1, C2,
2039 isExact ? PossiblyExactOperator::IsExact : 0);
2042 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
2043 return get(Instruction::SDiv, C1, C2,
2044 isExact ? PossiblyExactOperator::IsExact : 0);
2047 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
2048 return get(Instruction::FDiv, C1, C2);
2051 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
2052 return get(Instruction::URem, C1, C2);
2055 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
2056 return get(Instruction::SRem, C1, C2);
2059 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
2060 return get(Instruction::FRem, C1, C2);
2063 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
2064 return get(Instruction::And, C1, C2);
2067 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
2068 return get(Instruction::Or, C1, C2);
2071 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
2072 return get(Instruction::Xor, C1, C2);
2075 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
2076 bool HasNUW, bool HasNSW) {
2077 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
2078 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
2079 return get(Instruction::Shl, C1, C2, Flags);
2082 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2083 return get(Instruction::LShr, C1, C2,
2084 isExact ? PossiblyExactOperator::IsExact : 0);
2087 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2088 return get(Instruction::AShr, C1, C2,
2089 isExact ? PossiblyExactOperator::IsExact : 0);
2092 /// getBinOpIdentity - Return the identity for the given binary operation,
2093 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2094 /// returns null if the operator doesn't have an identity.
2095 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2098 // Doesn't have an identity.
2101 case Instruction::Add:
2102 case Instruction::Or:
2103 case Instruction::Xor:
2104 return Constant::getNullValue(Ty);
2106 case Instruction::Mul:
2107 return ConstantInt::get(Ty, 1);
2109 case Instruction::And:
2110 return Constant::getAllOnesValue(Ty);
2114 /// getBinOpAbsorber - Return the absorbing element for the given binary
2115 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2116 /// every X. For example, this returns zero for integer multiplication.
2117 /// It returns null if the operator doesn't have an absorbing element.
2118 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2121 // Doesn't have an absorber.
2124 case Instruction::Or:
2125 return Constant::getAllOnesValue(Ty);
2127 case Instruction::And:
2128 case Instruction::Mul:
2129 return Constant::getNullValue(Ty);
2133 // destroyConstant - Remove the constant from the constant table...
2135 void ConstantExpr::destroyConstant() {
2136 getType()->getContext().pImpl->ExprConstants.remove(this);
2137 destroyConstantImpl();
2140 const char *ConstantExpr::getOpcodeName() const {
2141 return Instruction::getOpcodeName(getOpcode());
2146 GetElementPtrConstantExpr::
2147 GetElementPtrConstantExpr(Constant *C, ArrayRef<Constant*> IdxList,
2149 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2150 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2151 - (IdxList.size()+1), IdxList.size()+1) {
2153 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2154 OperandList[i+1] = IdxList[i];
2157 //===----------------------------------------------------------------------===//
2158 // ConstantData* implementations
2160 void ConstantDataArray::anchor() {}
2161 void ConstantDataVector::anchor() {}
2163 /// getElementType - Return the element type of the array/vector.
2164 Type *ConstantDataSequential::getElementType() const {
2165 return getType()->getElementType();
2168 StringRef ConstantDataSequential::getRawDataValues() const {
2169 return StringRef(DataElements, getNumElements()*getElementByteSize());
2172 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2173 /// formed with a vector or array of the specified element type.
2174 /// ConstantDataArray only works with normal float and int types that are
2175 /// stored densely in memory, not with things like i42 or x86_f80.
2176 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2177 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2178 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2179 switch (IT->getBitWidth()) {
2191 /// getNumElements - Return the number of elements in the array or vector.
2192 unsigned ConstantDataSequential::getNumElements() const {
2193 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2194 return AT->getNumElements();
2195 return getType()->getVectorNumElements();
2199 /// getElementByteSize - Return the size in bytes of the elements in the data.
2200 uint64_t ConstantDataSequential::getElementByteSize() const {
2201 return getElementType()->getPrimitiveSizeInBits()/8;
2204 /// getElementPointer - Return the start of the specified element.
2205 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2206 assert(Elt < getNumElements() && "Invalid Elt");
2207 return DataElements+Elt*getElementByteSize();
2211 /// isAllZeros - return true if the array is empty or all zeros.
2212 static bool isAllZeros(StringRef Arr) {
2213 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2219 /// getImpl - This is the underlying implementation of all of the
2220 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2221 /// the correct element type. We take the bytes in as a StringRef because
2222 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2223 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2224 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2225 // If the elements are all zero or there are no elements, return a CAZ, which
2226 // is more dense and canonical.
2227 if (isAllZeros(Elements))
2228 return ConstantAggregateZero::get(Ty);
2230 // Do a lookup to see if we have already formed one of these.
2231 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2232 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2234 // The bucket can point to a linked list of different CDS's that have the same
2235 // body but different types. For example, 0,0,0,1 could be a 4 element array
2236 // of i8, or a 1-element array of i32. They'll both end up in the same
2237 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2238 ConstantDataSequential **Entry = &Slot.getValue();
2239 for (ConstantDataSequential *Node = *Entry; Node != 0;
2240 Entry = &Node->Next, Node = *Entry)
2241 if (Node->getType() == Ty)
2244 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2246 if (isa<ArrayType>(Ty))
2247 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2249 assert(isa<VectorType>(Ty));
2250 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2253 void ConstantDataSequential::destroyConstant() {
2254 // Remove the constant from the StringMap.
2255 StringMap<ConstantDataSequential*> &CDSConstants =
2256 getType()->getContext().pImpl->CDSConstants;
2258 StringMap<ConstantDataSequential*>::iterator Slot =
2259 CDSConstants.find(getRawDataValues());
2261 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2263 ConstantDataSequential **Entry = &Slot->getValue();
2265 // Remove the entry from the hash table.
2266 if ((*Entry)->Next == 0) {
2267 // If there is only one value in the bucket (common case) it must be this
2268 // entry, and removing the entry should remove the bucket completely.
2269 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2270 getContext().pImpl->CDSConstants.erase(Slot);
2272 // Otherwise, there are multiple entries linked off the bucket, unlink the
2273 // node we care about but keep the bucket around.
2274 for (ConstantDataSequential *Node = *Entry; ;
2275 Entry = &Node->Next, Node = *Entry) {
2276 assert(Node && "Didn't find entry in its uniquing hash table!");
2277 // If we found our entry, unlink it from the list and we're done.
2279 *Entry = Node->Next;
2285 // If we were part of a list, make sure that we don't delete the list that is
2286 // still owned by the uniquing map.
2289 // Finally, actually delete it.
2290 destroyConstantImpl();
2293 /// get() constructors - Return a constant with array type with an element
2294 /// count and element type matching the ArrayRef passed in. Note that this
2295 /// can return a ConstantAggregateZero object.
2296 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2297 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2298 const char *Data = reinterpret_cast<const char *>(Elts.data());
2299 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2301 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2302 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2303 const char *Data = reinterpret_cast<const char *>(Elts.data());
2304 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2306 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2307 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2308 const char *Data = reinterpret_cast<const char *>(Elts.data());
2309 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2311 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2312 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2313 const char *Data = reinterpret_cast<const char *>(Elts.data());
2314 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2316 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2317 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2318 const char *Data = reinterpret_cast<const char *>(Elts.data());
2319 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2321 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2322 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2323 const char *Data = reinterpret_cast<const char *>(Elts.data());
2324 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2327 /// getString - This method constructs a CDS and initializes it with a text
2328 /// string. The default behavior (AddNull==true) causes a null terminator to
2329 /// be placed at the end of the array (increasing the length of the string by
2330 /// one more than the StringRef would normally indicate. Pass AddNull=false
2331 /// to disable this behavior.
2332 Constant *ConstantDataArray::getString(LLVMContext &Context,
2333 StringRef Str, bool AddNull) {
2335 const uint8_t *Data = reinterpret_cast<const uint8_t *>(Str.data());
2336 return get(Context, ArrayRef<uint8_t>(const_cast<uint8_t *>(Data),
2340 SmallVector<uint8_t, 64> ElementVals;
2341 ElementVals.append(Str.begin(), Str.end());
2342 ElementVals.push_back(0);
2343 return get(Context, ElementVals);
2346 /// get() constructors - Return a constant with vector type with an element
2347 /// count and element type matching the ArrayRef passed in. Note that this
2348 /// can return a ConstantAggregateZero object.
2349 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2350 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2351 const char *Data = reinterpret_cast<const char *>(Elts.data());
2352 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*1), Ty);
2354 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2355 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2356 const char *Data = reinterpret_cast<const char *>(Elts.data());
2357 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*2), Ty);
2359 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2360 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2361 const char *Data = reinterpret_cast<const char *>(Elts.data());
2362 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2364 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2365 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2366 const char *Data = reinterpret_cast<const char *>(Elts.data());
2367 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2369 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2370 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2371 const char *Data = reinterpret_cast<const char *>(Elts.data());
2372 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*4), Ty);
2374 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2375 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2376 const char *Data = reinterpret_cast<const char *>(Elts.data());
2377 return getImpl(StringRef(const_cast<char *>(Data), Elts.size()*8), Ty);
2380 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2381 assert(isElementTypeCompatible(V->getType()) &&
2382 "Element type not compatible with ConstantData");
2383 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2384 if (CI->getType()->isIntegerTy(8)) {
2385 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2386 return get(V->getContext(), Elts);
2388 if (CI->getType()->isIntegerTy(16)) {
2389 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2390 return get(V->getContext(), Elts);
2392 if (CI->getType()->isIntegerTy(32)) {
2393 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2394 return get(V->getContext(), Elts);
2396 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2397 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2398 return get(V->getContext(), Elts);
2401 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2402 if (CFP->getType()->isFloatTy()) {
2403 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2404 return get(V->getContext(), Elts);
2406 if (CFP->getType()->isDoubleTy()) {
2407 SmallVector<double, 16> Elts(NumElts,
2408 CFP->getValueAPF().convertToDouble());
2409 return get(V->getContext(), Elts);
2412 return ConstantVector::getSplat(NumElts, V);
2416 /// getElementAsInteger - If this is a sequential container of integers (of
2417 /// any size), return the specified element in the low bits of a uint64_t.
2418 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2419 assert(isa<IntegerType>(getElementType()) &&
2420 "Accessor can only be used when element is an integer");
2421 const char *EltPtr = getElementPointer(Elt);
2423 // The data is stored in host byte order, make sure to cast back to the right
2424 // type to load with the right endianness.
2425 switch (getElementType()->getIntegerBitWidth()) {
2426 default: llvm_unreachable("Invalid bitwidth for CDS");
2428 return *const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(EltPtr));
2430 return *const_cast<uint16_t *>(reinterpret_cast<const uint16_t *>(EltPtr));
2432 return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(EltPtr));
2434 return *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(EltPtr));
2438 /// getElementAsAPFloat - If this is a sequential container of floating point
2439 /// type, return the specified element as an APFloat.
2440 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2441 const char *EltPtr = getElementPointer(Elt);
2443 switch (getElementType()->getTypeID()) {
2445 llvm_unreachable("Accessor can only be used when element is float/double!");
2446 case Type::FloatTyID: {
2447 const float *FloatPrt = reinterpret_cast<const float *>(EltPtr);
2448 return APFloat(*const_cast<float *>(FloatPrt));
2450 case Type::DoubleTyID: {
2451 const double *DoublePtr = reinterpret_cast<const double *>(EltPtr);
2452 return APFloat(*const_cast<double *>(DoublePtr));
2457 /// getElementAsFloat - If this is an sequential container of floats, return
2458 /// the specified element as a float.
2459 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2460 assert(getElementType()->isFloatTy() &&
2461 "Accessor can only be used when element is a 'float'");
2462 const float *EltPtr = reinterpret_cast<const float *>(getElementPointer(Elt));
2463 return *const_cast<float *>(EltPtr);
2466 /// getElementAsDouble - If this is an sequential container of doubles, return
2467 /// the specified element as a float.
2468 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2469 assert(getElementType()->isDoubleTy() &&
2470 "Accessor can only be used when element is a 'float'");
2471 const double *EltPtr =
2472 reinterpret_cast<const double *>(getElementPointer(Elt));
2473 return *const_cast<double *>(EltPtr);
2476 /// getElementAsConstant - Return a Constant for a specified index's element.
2477 /// Note that this has to compute a new constant to return, so it isn't as
2478 /// efficient as getElementAsInteger/Float/Double.
2479 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2480 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2481 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2483 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2486 /// isString - This method returns true if this is an array of i8.
2487 bool ConstantDataSequential::isString() const {
2488 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2491 /// isCString - This method returns true if the array "isString", ends with a
2492 /// nul byte, and does not contains any other nul bytes.
2493 bool ConstantDataSequential::isCString() const {
2497 StringRef Str = getAsString();
2499 // The last value must be nul.
2500 if (Str.back() != 0) return false;
2502 // Other elements must be non-nul.
2503 return Str.drop_back().find(0) == StringRef::npos;
2506 /// getSplatValue - If this is a splat constant, meaning that all of the
2507 /// elements have the same value, return that value. Otherwise return NULL.
2508 Constant *ConstantDataVector::getSplatValue() const {
2509 const char *Base = getRawDataValues().data();
2511 // Compare elements 1+ to the 0'th element.
2512 unsigned EltSize = getElementByteSize();
2513 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2514 if (memcmp(Base, Base+i*EltSize, EltSize))
2517 // If they're all the same, return the 0th one as a representative.
2518 return getElementAsConstant(0);
2521 //===----------------------------------------------------------------------===//
2522 // replaceUsesOfWithOnConstant implementations
2524 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2525 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2528 /// Note that we intentionally replace all uses of From with To here. Consider
2529 /// a large array that uses 'From' 1000 times. By handling this case all here,
2530 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2531 /// single invocation handles all 1000 uses. Handling them one at a time would
2532 /// work, but would be really slow because it would have to unique each updated
2535 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2537 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2538 Constant *ToC = cast<Constant>(To);
2540 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2542 SmallVector<Constant*, 8> Values;
2543 LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
2544 Lookup.first = cast<ArrayType>(getType());
2545 Values.reserve(getNumOperands()); // Build replacement array.
2547 // Fill values with the modified operands of the constant array. Also,
2548 // compute whether this turns into an all-zeros array.
2549 unsigned NumUpdated = 0;
2551 // Keep track of whether all the values in the array are "ToC".
2552 bool AllSame = true;
2553 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2554 Constant *Val = cast<Constant>(O->get());
2559 Values.push_back(Val);
2560 AllSame &= Val == ToC;
2563 Constant *Replacement = 0;
2564 if (AllSame && ToC->isNullValue()) {
2565 Replacement = ConstantAggregateZero::get(getType());
2566 } else if (AllSame && isa<UndefValue>(ToC)) {
2567 Replacement = UndefValue::get(getType());
2569 // Check to see if we have this array type already.
2570 Lookup.second = makeArrayRef(Values);
2571 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2572 pImpl->ArrayConstants.find(Lookup);
2574 if (I != pImpl->ArrayConstants.map_end()) {
2575 Replacement = I->first;
2577 // Okay, the new shape doesn't exist in the system yet. Instead of
2578 // creating a new constant array, inserting it, replaceallusesof'ing the
2579 // old with the new, then deleting the old... just update the current one
2581 pImpl->ArrayConstants.remove(this);
2583 // Update to the new value. Optimize for the case when we have a single
2584 // operand that we're changing, but handle bulk updates efficiently.
2585 if (NumUpdated == 1) {
2586 unsigned OperandToUpdate = U - OperandList;
2587 assert(getOperand(OperandToUpdate) == From &&
2588 "ReplaceAllUsesWith broken!");
2589 setOperand(OperandToUpdate, ToC);
2591 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2592 if (getOperand(i) == From)
2595 pImpl->ArrayConstants.insert(this);
2600 // Otherwise, I do need to replace this with an existing value.
2601 assert(Replacement != this && "I didn't contain From!");
2603 // Everyone using this now uses the replacement.
2604 replaceAllUsesWith(Replacement);
2606 // Delete the old constant!
2610 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2612 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2613 Constant *ToC = cast<Constant>(To);
2615 unsigned OperandToUpdate = U-OperandList;
2616 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2618 SmallVector<Constant*, 8> Values;
2619 LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
2620 Lookup.first = cast<StructType>(getType());
2621 Values.reserve(getNumOperands()); // Build replacement struct.
2623 // Fill values with the modified operands of the constant struct. Also,
2624 // compute whether this turns into an all-zeros struct.
2625 bool isAllZeros = false;
2626 bool isAllUndef = false;
2627 if (ToC->isNullValue()) {
2629 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2630 Constant *Val = cast<Constant>(O->get());
2631 Values.push_back(Val);
2632 if (isAllZeros) isAllZeros = Val->isNullValue();
2634 } else if (isa<UndefValue>(ToC)) {
2636 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2637 Constant *Val = cast<Constant>(O->get());
2638 Values.push_back(Val);
2639 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2642 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2643 Values.push_back(cast<Constant>(O->get()));
2645 Values[OperandToUpdate] = ToC;
2647 LLVMContextImpl *pImpl = getContext().pImpl;
2649 Constant *Replacement = 0;
2651 Replacement = ConstantAggregateZero::get(getType());
2652 } else if (isAllUndef) {
2653 Replacement = UndefValue::get(getType());
2655 // Check to see if we have this struct type already.
2656 Lookup.second = makeArrayRef(Values);
2657 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2658 pImpl->StructConstants.find(Lookup);
2660 if (I != pImpl->StructConstants.map_end()) {
2661 Replacement = I->first;
2663 // Okay, the new shape doesn't exist in the system yet. Instead of
2664 // creating a new constant struct, inserting it, replaceallusesof'ing the
2665 // old with the new, then deleting the old... just update the current one
2667 pImpl->StructConstants.remove(this);
2669 // Update to the new value.
2670 setOperand(OperandToUpdate, ToC);
2671 pImpl->StructConstants.insert(this);
2676 assert(Replacement != this && "I didn't contain From!");
2678 // Everyone using this now uses the replacement.
2679 replaceAllUsesWith(Replacement);
2681 // Delete the old constant!
2685 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2687 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2689 SmallVector<Constant*, 8> Values;
2690 Values.reserve(getNumOperands()); // Build replacement array...
2691 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2692 Constant *Val = getOperand(i);
2693 if (Val == From) Val = cast<Constant>(To);
2694 Values.push_back(Val);
2697 Constant *Replacement = get(Values);
2698 assert(Replacement != this && "I didn't contain From!");
2700 // Everyone using this now uses the replacement.
2701 replaceAllUsesWith(Replacement);
2703 // Delete the old constant!
2707 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2709 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2710 Constant *To = cast<Constant>(ToV);
2712 SmallVector<Constant*, 8> NewOps;
2713 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2714 Constant *Op = getOperand(i);
2715 NewOps.push_back(Op == From ? To : Op);
2718 Constant *Replacement = getWithOperands(NewOps);
2719 assert(Replacement != this && "I didn't contain From!");
2721 // Everyone using this now uses the replacement.
2722 replaceAllUsesWith(Replacement);
2724 // Delete the old constant!
2728 Instruction *ConstantExpr::getAsInstruction() {
2729 SmallVector<Value*,4> ValueOperands;
2730 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
2731 ValueOperands.push_back(cast<Value>(I));
2733 ArrayRef<Value*> Ops(ValueOperands);
2735 switch (getOpcode()) {
2736 case Instruction::Trunc:
2737 case Instruction::ZExt:
2738 case Instruction::SExt:
2739 case Instruction::FPTrunc:
2740 case Instruction::FPExt:
2741 case Instruction::UIToFP:
2742 case Instruction::SIToFP:
2743 case Instruction::FPToUI:
2744 case Instruction::FPToSI:
2745 case Instruction::PtrToInt:
2746 case Instruction::IntToPtr:
2747 case Instruction::BitCast:
2748 return CastInst::Create((Instruction::CastOps)getOpcode(),
2750 case Instruction::Select:
2751 return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
2752 case Instruction::InsertElement:
2753 return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
2754 case Instruction::ExtractElement:
2755 return ExtractElementInst::Create(Ops[0], Ops[1]);
2756 case Instruction::InsertValue:
2757 return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
2758 case Instruction::ExtractValue:
2759 return ExtractValueInst::Create(Ops[0], getIndices());
2760 case Instruction::ShuffleVector:
2761 return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
2763 case Instruction::GetElementPtr:
2764 if (cast<GEPOperator>(this)->isInBounds())
2765 return GetElementPtrInst::CreateInBounds(Ops[0], Ops.slice(1));
2767 return GetElementPtrInst::Create(Ops[0], Ops.slice(1));
2769 case Instruction::ICmp:
2770 case Instruction::FCmp:
2771 return CmpInst::Create((Instruction::OtherOps)getOpcode(),
2772 getPredicate(), Ops[0], Ops[1]);
2775 assert(getNumOperands() == 2 && "Must be binary operator?");
2776 BinaryOperator *BO =
2777 BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
2779 if (isa<OverflowingBinaryOperator>(BO)) {
2780 BO->setHasNoUnsignedWrap(SubclassOptionalData &
2781 OverflowingBinaryOperator::NoUnsignedWrap);
2782 BO->setHasNoSignedWrap(SubclassOptionalData &
2783 OverflowingBinaryOperator::NoSignedWrap);
2785 if (isa<PossiblyExactOperator>(BO))
2786 BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);