1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "LLVMContextImpl.h"
16 #include "ConstantFold.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/GlobalValue.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/Operator.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/ADT/DenseMap.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/STLExtras.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Otherwise, just use +0.0.
54 bool Constant::isNullValue() const {
56 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
60 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
61 return CFP->isZero() && !CFP->isNegative();
63 // constant zero is zero for aggregates and cpnull is null for pointers.
64 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
67 bool Constant::isAllOnesValue() const {
68 // Check for -1 integers
69 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
70 return CI->isMinusOne();
72 // Check for FP which are bitcasted from -1 integers
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
74 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
76 // Check for constant vectors which are splats of -1 values.
77 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
78 if (Constant *Splat = CV->getSplatValue())
79 return Splat->isAllOnesValue();
81 // Check for constant vectors which are splats of -1 values.
82 if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(this))
83 if (Constant *Splat = CV->getSplatValue())
84 return Splat->isAllOnesValue();
89 // Constructor to create a '0' constant of arbitrary type...
90 Constant *Constant::getNullValue(Type *Ty) {
91 switch (Ty->getTypeID()) {
92 case Type::IntegerTyID:
93 return ConstantInt::get(Ty, 0);
95 return ConstantFP::get(Ty->getContext(),
96 APFloat::getZero(APFloat::IEEEhalf));
98 return ConstantFP::get(Ty->getContext(),
99 APFloat::getZero(APFloat::IEEEsingle));
100 case Type::DoubleTyID:
101 return ConstantFP::get(Ty->getContext(),
102 APFloat::getZero(APFloat::IEEEdouble));
103 case Type::X86_FP80TyID:
104 return ConstantFP::get(Ty->getContext(),
105 APFloat::getZero(APFloat::x87DoubleExtended));
106 case Type::FP128TyID:
107 return ConstantFP::get(Ty->getContext(),
108 APFloat::getZero(APFloat::IEEEquad));
109 case Type::PPC_FP128TyID:
110 return ConstantFP::get(Ty->getContext(),
111 APFloat(APInt::getNullValue(128)));
112 case Type::PointerTyID:
113 return ConstantPointerNull::get(cast<PointerType>(Ty));
114 case Type::StructTyID:
115 case Type::ArrayTyID:
116 case Type::VectorTyID:
117 return ConstantAggregateZero::get(Ty);
119 // Function, Label, or Opaque type?
120 llvm_unreachable("Cannot create a null constant of that type!");
124 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
125 Type *ScalarTy = Ty->getScalarType();
127 // Create the base integer constant.
128 Constant *C = ConstantInt::get(Ty->getContext(), V);
130 // Convert an integer to a pointer, if necessary.
131 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
132 C = ConstantExpr::getIntToPtr(C, PTy);
134 // Broadcast a scalar to a vector, if necessary.
135 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
136 C = ConstantVector::getSplat(VTy->getNumElements(), C);
141 Constant *Constant::getAllOnesValue(Type *Ty) {
142 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
143 return ConstantInt::get(Ty->getContext(),
144 APInt::getAllOnesValue(ITy->getBitWidth()));
146 if (Ty->isFloatingPointTy()) {
147 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
148 !Ty->isPPC_FP128Ty());
149 return ConstantFP::get(Ty->getContext(), FL);
152 VectorType *VTy = cast<VectorType>(Ty);
153 return ConstantVector::getSplat(VTy->getNumElements(),
154 getAllOnesValue(VTy->getElementType()));
157 /// getAggregateElement - For aggregates (struct/array/vector) return the
158 /// constant that corresponds to the specified element if possible, or null if
159 /// not. This can return null if the element index is a ConstantExpr, or if
160 /// 'this' is a constant expr.
161 Constant *Constant::getAggregateElement(unsigned Elt) const {
162 if (const ConstantStruct *CS = dyn_cast<ConstantStruct>(this))
163 return Elt < CS->getNumOperands() ? CS->getOperand(Elt) : 0;
165 if (const ConstantArray *CA = dyn_cast<ConstantArray>(this))
166 return Elt < CA->getNumOperands() ? CA->getOperand(Elt) : 0;
168 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
169 return Elt < CV->getNumOperands() ? CV->getOperand(Elt) : 0;
171 if (const ConstantAggregateZero *CAZ =dyn_cast<ConstantAggregateZero>(this))
172 return CAZ->getElementValue(Elt);
174 if (const UndefValue *UV = dyn_cast<UndefValue>(this))
175 return UV->getElementValue(Elt);
177 if (const ConstantDataSequential *CDS =dyn_cast<ConstantDataSequential>(this))
178 return Elt < CDS->getNumElements() ? CDS->getElementAsConstant(Elt) : 0;
182 Constant *Constant::getAggregateElement(Constant *Elt) const {
183 assert(isa<IntegerType>(Elt->getType()) && "Index must be an integer");
184 if (ConstantInt *CI = dyn_cast<ConstantInt>(Elt))
185 return getAggregateElement(CI->getZExtValue());
190 void Constant::destroyConstantImpl() {
191 // When a Constant is destroyed, there may be lingering
192 // references to the constant by other constants in the constant pool. These
193 // constants are implicitly dependent on the module that is being deleted,
194 // but they don't know that. Because we only find out when the CPV is
195 // deleted, we must now notify all of our users (that should only be
196 // Constants) that they are, in fact, invalid now and should be deleted.
198 while (!use_empty()) {
199 Value *V = use_back();
200 #ifndef NDEBUG // Only in -g mode...
201 if (!isa<Constant>(V)) {
202 dbgs() << "While deleting: " << *this
203 << "\n\nUse still stuck around after Def is destroyed: "
207 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
208 cast<Constant>(V)->destroyConstant();
210 // The constant should remove itself from our use list...
211 assert((use_empty() || use_back() != V) && "Constant not removed!");
214 // Value has no outstanding references it is safe to delete it now...
218 /// canTrap - Return true if evaluation of this constant could trap. This is
219 /// true for things like constant expressions that could divide by zero.
220 bool Constant::canTrap() const {
221 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
222 // The only thing that could possibly trap are constant exprs.
223 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
224 if (!CE) return false;
226 // ConstantExpr traps if any operands can trap.
227 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
228 if (CE->getOperand(i)->canTrap())
231 // Otherwise, only specific operations can trap.
232 switch (CE->getOpcode()) {
235 case Instruction::UDiv:
236 case Instruction::SDiv:
237 case Instruction::FDiv:
238 case Instruction::URem:
239 case Instruction::SRem:
240 case Instruction::FRem:
241 // Div and rem can trap if the RHS is not known to be non-zero.
242 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
248 /// isConstantUsed - Return true if the constant has users other than constant
249 /// exprs and other dangling things.
250 bool Constant::isConstantUsed() const {
251 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
252 const Constant *UC = dyn_cast<Constant>(*UI);
253 if (UC == 0 || isa<GlobalValue>(UC))
256 if (UC->isConstantUsed())
264 /// getRelocationInfo - This method classifies the entry according to
265 /// whether or not it may generate a relocation entry. This must be
266 /// conservative, so if it might codegen to a relocatable entry, it should say
267 /// so. The return values are:
269 /// NoRelocation: This constant pool entry is guaranteed to never have a
270 /// relocation applied to it (because it holds a simple constant like
272 /// LocalRelocation: This entry has relocations, but the entries are
273 /// guaranteed to be resolvable by the static linker, so the dynamic
274 /// linker will never see them.
275 /// GlobalRelocations: This entry may have arbitrary relocations.
277 /// FIXME: This really should not be in VMCore.
278 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
279 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
280 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
281 return LocalRelocation; // Local to this file/library.
282 return GlobalRelocations; // Global reference.
285 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
286 return BA->getFunction()->getRelocationInfo();
288 // While raw uses of blockaddress need to be relocated, differences between
289 // two of them don't when they are for labels in the same function. This is a
290 // common idiom when creating a table for the indirect goto extension, so we
291 // handle it efficiently here.
292 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
293 if (CE->getOpcode() == Instruction::Sub) {
294 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
295 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
297 LHS->getOpcode() == Instruction::PtrToInt &&
298 RHS->getOpcode() == Instruction::PtrToInt &&
299 isa<BlockAddress>(LHS->getOperand(0)) &&
300 isa<BlockAddress>(RHS->getOperand(0)) &&
301 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
302 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
306 PossibleRelocationsTy Result = NoRelocation;
307 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
308 Result = std::max(Result,
309 cast<Constant>(getOperand(i))->getRelocationInfo());
314 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
315 /// it. This involves recursively eliminating any dead users of the
317 static bool removeDeadUsersOfConstant(const Constant *C) {
318 if (isa<GlobalValue>(C)) return false; // Cannot remove this
320 while (!C->use_empty()) {
321 const Constant *User = dyn_cast<Constant>(C->use_back());
322 if (!User) return false; // Non-constant usage;
323 if (!removeDeadUsersOfConstant(User))
324 return false; // Constant wasn't dead
327 const_cast<Constant*>(C)->destroyConstant();
332 /// removeDeadConstantUsers - If there are any dead constant users dangling
333 /// off of this constant, remove them. This method is useful for clients
334 /// that want to check to see if a global is unused, but don't want to deal
335 /// with potentially dead constants hanging off of the globals.
336 void Constant::removeDeadConstantUsers() const {
337 Value::const_use_iterator I = use_begin(), E = use_end();
338 Value::const_use_iterator LastNonDeadUser = E;
340 const Constant *User = dyn_cast<Constant>(*I);
347 if (!removeDeadUsersOfConstant(User)) {
348 // If the constant wasn't dead, remember that this was the last live use
349 // and move on to the next constant.
355 // If the constant was dead, then the iterator is invalidated.
356 if (LastNonDeadUser == E) {
368 //===----------------------------------------------------------------------===//
370 //===----------------------------------------------------------------------===//
372 void ConstantInt::anchor() { }
374 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
375 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
376 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
379 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
380 LLVMContextImpl *pImpl = Context.pImpl;
381 if (!pImpl->TheTrueVal)
382 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
383 return pImpl->TheTrueVal;
386 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
387 LLVMContextImpl *pImpl = Context.pImpl;
388 if (!pImpl->TheFalseVal)
389 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
390 return pImpl->TheFalseVal;
393 Constant *ConstantInt::getTrue(Type *Ty) {
394 VectorType *VTy = dyn_cast<VectorType>(Ty);
396 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
397 return ConstantInt::getTrue(Ty->getContext());
399 assert(VTy->getElementType()->isIntegerTy(1) &&
400 "True must be vector of i1 or i1.");
401 return ConstantVector::getSplat(VTy->getNumElements(),
402 ConstantInt::getTrue(Ty->getContext()));
405 Constant *ConstantInt::getFalse(Type *Ty) {
406 VectorType *VTy = dyn_cast<VectorType>(Ty);
408 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
409 return ConstantInt::getFalse(Ty->getContext());
411 assert(VTy->getElementType()->isIntegerTy(1) &&
412 "False must be vector of i1 or i1.");
413 return ConstantVector::getSplat(VTy->getNumElements(),
414 ConstantInt::getFalse(Ty->getContext()));
418 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
419 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
420 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
421 // compare APInt's of different widths, which would violate an APInt class
422 // invariant which generates an assertion.
423 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
424 // Get the corresponding integer type for the bit width of the value.
425 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
426 // get an existing value or the insertion position
427 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
428 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
429 if (!Slot) Slot = new ConstantInt(ITy, V);
433 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
434 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
436 // For vectors, broadcast the value.
437 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
438 return ConstantVector::getSplat(VTy->getNumElements(), C);
443 ConstantInt *ConstantInt::get(IntegerType *Ty, uint64_t V,
445 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
448 ConstantInt *ConstantInt::getSigned(IntegerType *Ty, int64_t V) {
449 return get(Ty, V, true);
452 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
453 return get(Ty, V, true);
456 Constant *ConstantInt::get(Type *Ty, const APInt& V) {
457 ConstantInt *C = get(Ty->getContext(), V);
458 assert(C->getType() == Ty->getScalarType() &&
459 "ConstantInt type doesn't match the type implied by its value!");
461 // For vectors, broadcast the value.
462 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
463 return ConstantVector::getSplat(VTy->getNumElements(), C);
468 ConstantInt *ConstantInt::get(IntegerType* Ty, StringRef Str,
470 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
473 //===----------------------------------------------------------------------===//
475 //===----------------------------------------------------------------------===//
477 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
479 return &APFloat::IEEEhalf;
481 return &APFloat::IEEEsingle;
482 if (Ty->isDoubleTy())
483 return &APFloat::IEEEdouble;
484 if (Ty->isX86_FP80Ty())
485 return &APFloat::x87DoubleExtended;
486 else if (Ty->isFP128Ty())
487 return &APFloat::IEEEquad;
489 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
490 return &APFloat::PPCDoubleDouble;
493 void ConstantFP::anchor() { }
495 /// get() - This returns a constant fp for the specified value in the
496 /// specified type. This should only be used for simple constant values like
497 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
498 Constant *ConstantFP::get(Type *Ty, double V) {
499 LLVMContext &Context = Ty->getContext();
503 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
504 APFloat::rmNearestTiesToEven, &ignored);
505 Constant *C = get(Context, FV);
507 // For vectors, broadcast the value.
508 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
509 return ConstantVector::getSplat(VTy->getNumElements(), C);
515 Constant *ConstantFP::get(Type *Ty, StringRef Str) {
516 LLVMContext &Context = Ty->getContext();
518 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
519 Constant *C = get(Context, FV);
521 // For vectors, broadcast the value.
522 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
523 return ConstantVector::getSplat(VTy->getNumElements(), C);
529 ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
530 LLVMContext &Context = Ty->getContext();
531 APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
533 return get(Context, apf);
537 Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
538 Type *ScalarTy = Ty->getScalarType();
539 if (ScalarTy->isFloatingPointTy()) {
540 Constant *C = getNegativeZero(ScalarTy);
541 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
542 return ConstantVector::getSplat(VTy->getNumElements(), C);
546 return Constant::getNullValue(Ty);
550 // ConstantFP accessors.
551 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
552 DenseMapAPFloatKeyInfo::KeyTy Key(V);
554 LLVMContextImpl* pImpl = Context.pImpl;
556 ConstantFP *&Slot = pImpl->FPConstants[Key];
560 if (&V.getSemantics() == &APFloat::IEEEhalf)
561 Ty = Type::getHalfTy(Context);
562 else if (&V.getSemantics() == &APFloat::IEEEsingle)
563 Ty = Type::getFloatTy(Context);
564 else if (&V.getSemantics() == &APFloat::IEEEdouble)
565 Ty = Type::getDoubleTy(Context);
566 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
567 Ty = Type::getX86_FP80Ty(Context);
568 else if (&V.getSemantics() == &APFloat::IEEEquad)
569 Ty = Type::getFP128Ty(Context);
571 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
572 "Unknown FP format");
573 Ty = Type::getPPC_FP128Ty(Context);
575 Slot = new ConstantFP(Ty, V);
581 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
582 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
583 return ConstantFP::get(Ty->getContext(),
584 APFloat::getInf(Semantics, Negative));
587 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
588 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
589 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
593 bool ConstantFP::isExactlyValue(const APFloat &V) const {
594 return Val.bitwiseIsEqual(V);
597 //===----------------------------------------------------------------------===//
598 // ConstantAggregateZero Implementation
599 //===----------------------------------------------------------------------===//
601 /// getSequentialElement - If this CAZ has array or vector type, return a zero
602 /// with the right element type.
603 Constant *ConstantAggregateZero::getSequentialElement() const {
604 return Constant::getNullValue(getType()->getSequentialElementType());
607 /// getStructElement - If this CAZ has struct type, return a zero with the
608 /// right element type for the specified element.
609 Constant *ConstantAggregateZero::getStructElement(unsigned Elt) const {
610 return Constant::getNullValue(getType()->getStructElementType(Elt));
613 /// getElementValue - Return a zero of the right value for the specified GEP
614 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
615 Constant *ConstantAggregateZero::getElementValue(Constant *C) const {
616 if (isa<SequentialType>(getType()))
617 return getSequentialElement();
618 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
621 /// getElementValue - Return a zero of the right value for the specified GEP
623 Constant *ConstantAggregateZero::getElementValue(unsigned Idx) const {
624 if (isa<SequentialType>(getType()))
625 return getSequentialElement();
626 return getStructElement(Idx);
630 //===----------------------------------------------------------------------===//
631 // UndefValue Implementation
632 //===----------------------------------------------------------------------===//
634 /// getSequentialElement - If this undef has array or vector type, return an
635 /// undef with the right element type.
636 UndefValue *UndefValue::getSequentialElement() const {
637 return UndefValue::get(getType()->getSequentialElementType());
640 /// getStructElement - If this undef has struct type, return a zero with the
641 /// right element type for the specified element.
642 UndefValue *UndefValue::getStructElement(unsigned Elt) const {
643 return UndefValue::get(getType()->getStructElementType(Elt));
646 /// getElementValue - Return an undef of the right value for the specified GEP
647 /// index if we can, otherwise return null (e.g. if C is a ConstantExpr).
648 UndefValue *UndefValue::getElementValue(Constant *C) const {
649 if (isa<SequentialType>(getType()))
650 return getSequentialElement();
651 return getStructElement(cast<ConstantInt>(C)->getZExtValue());
654 /// getElementValue - Return an undef of the right value for the specified GEP
656 UndefValue *UndefValue::getElementValue(unsigned Idx) const {
657 if (isa<SequentialType>(getType()))
658 return getSequentialElement();
659 return getStructElement(Idx);
664 //===----------------------------------------------------------------------===//
665 // ConstantXXX Classes
666 //===----------------------------------------------------------------------===//
668 template <typename ItTy, typename EltTy>
669 static bool rangeOnlyContains(ItTy Start, ItTy End, EltTy Elt) {
670 for (; Start != End; ++Start)
676 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
677 : Constant(T, ConstantArrayVal,
678 OperandTraits<ConstantArray>::op_end(this) - V.size(),
680 assert(V.size() == T->getNumElements() &&
681 "Invalid initializer vector for constant array");
682 for (unsigned i = 0, e = V.size(); i != e; ++i)
683 assert(V[i]->getType() == T->getElementType() &&
684 "Initializer for array element doesn't match array element type!");
685 std::copy(V.begin(), V.end(), op_begin());
688 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
689 // Empty arrays are canonicalized to ConstantAggregateZero.
691 return ConstantAggregateZero::get(Ty);
693 for (unsigned i = 0, e = V.size(); i != e; ++i) {
694 assert(V[i]->getType() == Ty->getElementType() &&
695 "Wrong type in array element initializer");
697 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
699 // If this is an all-zero array, return a ConstantAggregateZero object. If
700 // all undef, return an UndefValue, if "all simple", then return a
701 // ConstantDataArray.
703 if (isa<UndefValue>(C) && rangeOnlyContains(V.begin(), V.end(), C))
704 return UndefValue::get(Ty);
706 if (C->isNullValue() && rangeOnlyContains(V.begin(), V.end(), C))
707 return ConstantAggregateZero::get(Ty);
709 // Check to see if all of the elements are ConstantFP or ConstantInt and if
710 // the element type is compatible with ConstantDataVector. If so, use it.
711 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
712 // We speculatively build the elements here even if it turns out that there
713 // is a constantexpr or something else weird in the array, since it is so
714 // uncommon for that to happen.
715 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
716 if (CI->getType()->isIntegerTy(8)) {
717 SmallVector<uint8_t, 16> Elts;
718 for (unsigned i = 0, e = V.size(); i != e; ++i)
719 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
720 Elts.push_back(CI->getZExtValue());
723 if (Elts.size() == V.size())
724 return ConstantDataArray::get(C->getContext(), Elts);
725 } else if (CI->getType()->isIntegerTy(16)) {
726 SmallVector<uint16_t, 16> Elts;
727 for (unsigned i = 0, e = V.size(); i != e; ++i)
728 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
729 Elts.push_back(CI->getZExtValue());
732 if (Elts.size() == V.size())
733 return ConstantDataArray::get(C->getContext(), Elts);
734 } else if (CI->getType()->isIntegerTy(32)) {
735 SmallVector<uint32_t, 16> Elts;
736 for (unsigned i = 0, e = V.size(); i != e; ++i)
737 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
738 Elts.push_back(CI->getZExtValue());
741 if (Elts.size() == V.size())
742 return ConstantDataArray::get(C->getContext(), Elts);
743 } else if (CI->getType()->isIntegerTy(64)) {
744 SmallVector<uint64_t, 16> Elts;
745 for (unsigned i = 0, e = V.size(); i != e; ++i)
746 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
747 Elts.push_back(CI->getZExtValue());
750 if (Elts.size() == V.size())
751 return ConstantDataArray::get(C->getContext(), Elts);
755 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
756 if (CFP->getType()->isFloatTy()) {
757 SmallVector<float, 16> Elts;
758 for (unsigned i = 0, e = V.size(); i != e; ++i)
759 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
760 Elts.push_back(CFP->getValueAPF().convertToFloat());
763 if (Elts.size() == V.size())
764 return ConstantDataArray::get(C->getContext(), Elts);
765 } else if (CFP->getType()->isDoubleTy()) {
766 SmallVector<double, 16> Elts;
767 for (unsigned i = 0, e = V.size(); i != e; ++i)
768 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
769 Elts.push_back(CFP->getValueAPF().convertToDouble());
772 if (Elts.size() == V.size())
773 return ConstantDataArray::get(C->getContext(), Elts);
778 // Otherwise, we really do want to create a ConstantArray.
779 return pImpl->ArrayConstants.getOrCreate(Ty, V);
782 /// getTypeForElements - Return an anonymous struct type to use for a constant
783 /// with the specified set of elements. The list must not be empty.
784 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
785 ArrayRef<Constant*> V,
787 unsigned VecSize = V.size();
788 SmallVector<Type*, 16> EltTypes(VecSize);
789 for (unsigned i = 0; i != VecSize; ++i)
790 EltTypes[i] = V[i]->getType();
792 return StructType::get(Context, EltTypes, Packed);
796 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
799 "ConstantStruct::getTypeForElements cannot be called on empty list");
800 return getTypeForElements(V[0]->getContext(), V, Packed);
804 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
805 : Constant(T, ConstantStructVal,
806 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
808 assert(V.size() == T->getNumElements() &&
809 "Invalid initializer vector for constant structure");
810 for (unsigned i = 0, e = V.size(); i != e; ++i)
811 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
812 "Initializer for struct element doesn't match struct element type!");
813 std::copy(V.begin(), V.end(), op_begin());
816 // ConstantStruct accessors.
817 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
818 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
819 "Incorrect # elements specified to ConstantStruct::get");
821 // Create a ConstantAggregateZero value if all elements are zeros.
823 bool isUndef = false;
826 isUndef = isa<UndefValue>(V[0]);
827 isZero = V[0]->isNullValue();
828 if (isUndef || isZero) {
829 for (unsigned i = 0, e = V.size(); i != e; ++i) {
830 if (!V[i]->isNullValue())
832 if (!isa<UndefValue>(V[i]))
838 return ConstantAggregateZero::get(ST);
840 return UndefValue::get(ST);
842 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
845 Constant *ConstantStruct::get(StructType *T, ...) {
847 SmallVector<Constant*, 8> Values;
849 while (Constant *Val = va_arg(ap, llvm::Constant*))
850 Values.push_back(Val);
852 return get(T, Values);
855 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
856 : Constant(T, ConstantVectorVal,
857 OperandTraits<ConstantVector>::op_end(this) - V.size(),
859 for (size_t i = 0, e = V.size(); i != e; i++)
860 assert(V[i]->getType() == T->getElementType() &&
861 "Initializer for vector element doesn't match vector element type!");
862 std::copy(V.begin(), V.end(), op_begin());
865 // ConstantVector accessors.
866 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
867 assert(!V.empty() && "Vectors can't be empty");
868 VectorType *T = VectorType::get(V.front()->getType(), V.size());
869 LLVMContextImpl *pImpl = T->getContext().pImpl;
871 // If this is an all-undef or all-zero vector, return a
872 // ConstantAggregateZero or UndefValue.
874 bool isZero = C->isNullValue();
875 bool isUndef = isa<UndefValue>(C);
877 if (isZero || isUndef) {
878 for (unsigned i = 1, e = V.size(); i != e; ++i)
880 isZero = isUndef = false;
886 return ConstantAggregateZero::get(T);
888 return UndefValue::get(T);
890 // Check to see if all of the elements are ConstantFP or ConstantInt and if
891 // the element type is compatible with ConstantDataVector. If so, use it.
892 if (ConstantDataSequential::isElementTypeCompatible(C->getType())) {
893 // We speculatively build the elements here even if it turns out that there
894 // is a constantexpr or something else weird in the array, since it is so
895 // uncommon for that to happen.
896 if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
897 if (CI->getType()->isIntegerTy(8)) {
898 SmallVector<uint8_t, 16> Elts;
899 for (unsigned i = 0, e = V.size(); i != e; ++i)
900 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
901 Elts.push_back(CI->getZExtValue());
904 if (Elts.size() == V.size())
905 return ConstantDataVector::get(C->getContext(), Elts);
906 } else if (CI->getType()->isIntegerTy(16)) {
907 SmallVector<uint16_t, 16> Elts;
908 for (unsigned i = 0, e = V.size(); i != e; ++i)
909 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
910 Elts.push_back(CI->getZExtValue());
913 if (Elts.size() == V.size())
914 return ConstantDataVector::get(C->getContext(), Elts);
915 } else if (CI->getType()->isIntegerTy(32)) {
916 SmallVector<uint32_t, 16> Elts;
917 for (unsigned i = 0, e = V.size(); i != e; ++i)
918 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
919 Elts.push_back(CI->getZExtValue());
922 if (Elts.size() == V.size())
923 return ConstantDataVector::get(C->getContext(), Elts);
924 } else if (CI->getType()->isIntegerTy(64)) {
925 SmallVector<uint64_t, 16> Elts;
926 for (unsigned i = 0, e = V.size(); i != e; ++i)
927 if (ConstantInt *CI = dyn_cast<ConstantInt>(V[i]))
928 Elts.push_back(CI->getZExtValue());
931 if (Elts.size() == V.size())
932 return ConstantDataVector::get(C->getContext(), Elts);
936 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
937 if (CFP->getType()->isFloatTy()) {
938 SmallVector<float, 16> Elts;
939 for (unsigned i = 0, e = V.size(); i != e; ++i)
940 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
941 Elts.push_back(CFP->getValueAPF().convertToFloat());
944 if (Elts.size() == V.size())
945 return ConstantDataVector::get(C->getContext(), Elts);
946 } else if (CFP->getType()->isDoubleTy()) {
947 SmallVector<double, 16> Elts;
948 for (unsigned i = 0, e = V.size(); i != e; ++i)
949 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V[i]))
950 Elts.push_back(CFP->getValueAPF().convertToDouble());
953 if (Elts.size() == V.size())
954 return ConstantDataVector::get(C->getContext(), Elts);
959 // Otherwise, the element type isn't compatible with ConstantDataVector, or
960 // the operand list constants a ConstantExpr or something else strange.
961 return pImpl->VectorConstants.getOrCreate(T, V);
964 Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
965 // If this splat is compatible with ConstantDataVector, use it instead of
967 if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
968 ConstantDataSequential::isElementTypeCompatible(V->getType()))
969 return ConstantDataVector::getSplat(NumElts, V);
971 SmallVector<Constant*, 32> Elts(NumElts, V);
976 // Utility function for determining if a ConstantExpr is a CastOp or not. This
977 // can't be inline because we don't want to #include Instruction.h into
979 bool ConstantExpr::isCast() const {
980 return Instruction::isCast(getOpcode());
983 bool ConstantExpr::isCompare() const {
984 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
987 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
988 if (getOpcode() != Instruction::GetElementPtr) return false;
990 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
991 User::const_op_iterator OI = llvm::next(this->op_begin());
993 // Skip the first index, as it has no static limit.
997 // The remaining indices must be compile-time known integers within the
998 // bounds of the corresponding notional static array types.
999 for (; GEPI != E; ++GEPI, ++OI) {
1000 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
1001 if (!CI) return false;
1002 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
1003 if (CI->getValue().getActiveBits() > 64 ||
1004 CI->getZExtValue() >= ATy->getNumElements())
1008 // All the indices checked out.
1012 bool ConstantExpr::hasIndices() const {
1013 return getOpcode() == Instruction::ExtractValue ||
1014 getOpcode() == Instruction::InsertValue;
1017 ArrayRef<unsigned> ConstantExpr::getIndices() const {
1018 if (const ExtractValueConstantExpr *EVCE =
1019 dyn_cast<ExtractValueConstantExpr>(this))
1020 return EVCE->Indices;
1022 return cast<InsertValueConstantExpr>(this)->Indices;
1025 unsigned ConstantExpr::getPredicate() const {
1026 assert(isCompare());
1027 return ((const CompareConstantExpr*)this)->predicate;
1030 /// getWithOperandReplaced - Return a constant expression identical to this
1031 /// one, but with the specified operand set to the specified value.
1033 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
1034 assert(Op->getType() == getOperand(OpNo)->getType() &&
1035 "Replacing operand with value of different type!");
1036 if (getOperand(OpNo) == Op)
1037 return const_cast<ConstantExpr*>(this);
1039 SmallVector<Constant*, 8> NewOps;
1040 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1041 NewOps.push_back(i == OpNo ? Op : getOperand(i));
1043 return getWithOperands(NewOps);
1046 /// getWithOperands - This returns the current constant expression with the
1047 /// operands replaced with the specified values. The specified array must
1048 /// have the same number of operands as our current one.
1049 Constant *ConstantExpr::
1050 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
1051 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
1052 bool AnyChange = Ty != getType();
1053 for (unsigned i = 0; i != Ops.size(); ++i)
1054 AnyChange |= Ops[i] != getOperand(i);
1056 if (!AnyChange) // No operands changed, return self.
1057 return const_cast<ConstantExpr*>(this);
1059 switch (getOpcode()) {
1060 case Instruction::Trunc:
1061 case Instruction::ZExt:
1062 case Instruction::SExt:
1063 case Instruction::FPTrunc:
1064 case Instruction::FPExt:
1065 case Instruction::UIToFP:
1066 case Instruction::SIToFP:
1067 case Instruction::FPToUI:
1068 case Instruction::FPToSI:
1069 case Instruction::PtrToInt:
1070 case Instruction::IntToPtr:
1071 case Instruction::BitCast:
1072 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
1073 case Instruction::Select:
1074 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
1075 case Instruction::InsertElement:
1076 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
1077 case Instruction::ExtractElement:
1078 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
1079 case Instruction::InsertValue:
1080 return ConstantExpr::getInsertValue(Ops[0], Ops[1], getIndices());
1081 case Instruction::ExtractValue:
1082 return ConstantExpr::getExtractValue(Ops[0], getIndices());
1083 case Instruction::ShuffleVector:
1084 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
1085 case Instruction::GetElementPtr:
1086 return ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
1087 cast<GEPOperator>(this)->isInBounds());
1088 case Instruction::ICmp:
1089 case Instruction::FCmp:
1090 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
1092 assert(getNumOperands() == 2 && "Must be binary operator?");
1093 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
1098 //===----------------------------------------------------------------------===//
1099 // isValueValidForType implementations
1101 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
1102 unsigned NumBits = Ty->getIntegerBitWidth(); // assert okay
1103 if (Ty->isIntegerTy(1))
1104 return Val == 0 || Val == 1;
1106 return true; // always true, has to fit in largest type
1107 uint64_t Max = (1ll << NumBits) - 1;
1111 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
1112 unsigned NumBits = Ty->getIntegerBitWidth();
1113 if (Ty->isIntegerTy(1))
1114 return Val == 0 || Val == 1 || Val == -1;
1116 return true; // always true, has to fit in largest type
1117 int64_t Min = -(1ll << (NumBits-1));
1118 int64_t Max = (1ll << (NumBits-1)) - 1;
1119 return (Val >= Min && Val <= Max);
1122 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
1123 // convert modifies in place, so make a copy.
1124 APFloat Val2 = APFloat(Val);
1126 switch (Ty->getTypeID()) {
1128 return false; // These can't be represented as floating point!
1130 // FIXME rounding mode needs to be more flexible
1131 case Type::HalfTyID: {
1132 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
1134 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
1137 case Type::FloatTyID: {
1138 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
1140 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
1143 case Type::DoubleTyID: {
1144 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
1145 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1146 &Val2.getSemantics() == &APFloat::IEEEdouble)
1148 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
1151 case Type::X86_FP80TyID:
1152 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1153 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1154 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1155 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
1156 case Type::FP128TyID:
1157 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1158 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1159 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1160 &Val2.getSemantics() == &APFloat::IEEEquad;
1161 case Type::PPC_FP128TyID:
1162 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
1163 &Val2.getSemantics() == &APFloat::IEEEsingle ||
1164 &Val2.getSemantics() == &APFloat::IEEEdouble ||
1165 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
1170 //===----------------------------------------------------------------------===//
1171 // Factory Function Implementation
1173 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
1174 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
1175 "Cannot create an aggregate zero of non-aggregate type!");
1177 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1179 Entry = new ConstantAggregateZero(Ty);
1184 /// destroyConstant - Remove the constant from the constant table.
1186 void ConstantAggregateZero::destroyConstant() {
1187 getContext().pImpl->CAZConstants.erase(getType());
1188 destroyConstantImpl();
1191 /// destroyConstant - Remove the constant from the constant table...
1193 void ConstantArray::destroyConstant() {
1194 getType()->getContext().pImpl->ArrayConstants.remove(this);
1195 destroyConstantImpl();
1199 //---- ConstantStruct::get() implementation...
1202 // destroyConstant - Remove the constant from the constant table...
1204 void ConstantStruct::destroyConstant() {
1205 getType()->getContext().pImpl->StructConstants.remove(this);
1206 destroyConstantImpl();
1209 // destroyConstant - Remove the constant from the constant table...
1211 void ConstantVector::destroyConstant() {
1212 getType()->getContext().pImpl->VectorConstants.remove(this);
1213 destroyConstantImpl();
1216 /// getSplatValue - If this is a splat constant, where all of the
1217 /// elements have the same value, return that value. Otherwise return null.
1218 Constant *ConstantVector::getSplatValue() const {
1219 // Check out first element.
1220 Constant *Elt = getOperand(0);
1221 // Then make sure all remaining elements point to the same value.
1222 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1223 if (getOperand(I) != Elt)
1228 //---- ConstantPointerNull::get() implementation.
1231 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1232 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1234 Entry = new ConstantPointerNull(Ty);
1239 // destroyConstant - Remove the constant from the constant table...
1241 void ConstantPointerNull::destroyConstant() {
1242 getContext().pImpl->CPNConstants.erase(getType());
1243 // Free the constant and any dangling references to it.
1244 destroyConstantImpl();
1248 //---- UndefValue::get() implementation.
1251 UndefValue *UndefValue::get(Type *Ty) {
1252 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1254 Entry = new UndefValue(Ty);
1259 // destroyConstant - Remove the constant from the constant table.
1261 void UndefValue::destroyConstant() {
1262 // Free the constant and any dangling references to it.
1263 getContext().pImpl->UVConstants.erase(getType());
1264 destroyConstantImpl();
1267 //---- BlockAddress::get() implementation.
1270 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1271 assert(BB->getParent() != 0 && "Block must have a parent");
1272 return get(BB->getParent(), BB);
1275 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1277 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1279 BA = new BlockAddress(F, BB);
1281 assert(BA->getFunction() == F && "Basic block moved between functions");
1285 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1286 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1290 BB->AdjustBlockAddressRefCount(1);
1294 // destroyConstant - Remove the constant from the constant table.
1296 void BlockAddress::destroyConstant() {
1297 getFunction()->getType()->getContext().pImpl
1298 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1299 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1300 destroyConstantImpl();
1303 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1304 // This could be replacing either the Basic Block or the Function. In either
1305 // case, we have to remove the map entry.
1306 Function *NewF = getFunction();
1307 BasicBlock *NewBB = getBasicBlock();
1310 NewF = cast<Function>(To);
1312 NewBB = cast<BasicBlock>(To);
1314 // See if the 'new' entry already exists, if not, just update this in place
1315 // and return early.
1316 BlockAddress *&NewBA =
1317 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1319 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1321 // Remove the old entry, this can't cause the map to rehash (just a
1322 // tombstone will get added).
1323 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1326 setOperand(0, NewF);
1327 setOperand(1, NewBB);
1328 getBasicBlock()->AdjustBlockAddressRefCount(1);
1332 // Otherwise, I do need to replace this with an existing value.
1333 assert(NewBA != this && "I didn't contain From!");
1335 // Everyone using this now uses the replacement.
1336 replaceAllUsesWith(NewBA);
1341 //---- ConstantExpr::get() implementations.
1344 /// This is a utility function to handle folding of casts and lookup of the
1345 /// cast in the ExprConstants map. It is used by the various get* methods below.
1346 static inline Constant *getFoldedCast(
1347 Instruction::CastOps opc, Constant *C, Type *Ty) {
1348 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1349 // Fold a few common cases
1350 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1353 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1355 // Look up the constant in the table first to ensure uniqueness
1356 std::vector<Constant*> argVec(1, C);
1357 ExprMapKeyType Key(opc, argVec);
1359 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1362 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1363 Instruction::CastOps opc = Instruction::CastOps(oc);
1364 assert(Instruction::isCast(opc) && "opcode out of range");
1365 assert(C && Ty && "Null arguments to getCast");
1366 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1370 llvm_unreachable("Invalid cast opcode");
1371 case Instruction::Trunc: return getTrunc(C, Ty);
1372 case Instruction::ZExt: return getZExt(C, Ty);
1373 case Instruction::SExt: return getSExt(C, Ty);
1374 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1375 case Instruction::FPExt: return getFPExtend(C, Ty);
1376 case Instruction::UIToFP: return getUIToFP(C, Ty);
1377 case Instruction::SIToFP: return getSIToFP(C, Ty);
1378 case Instruction::FPToUI: return getFPToUI(C, Ty);
1379 case Instruction::FPToSI: return getFPToSI(C, Ty);
1380 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1381 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1382 case Instruction::BitCast: return getBitCast(C, Ty);
1386 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1387 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1388 return getBitCast(C, Ty);
1389 return getZExt(C, Ty);
1392 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1393 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1394 return getBitCast(C, Ty);
1395 return getSExt(C, Ty);
1398 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1399 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1400 return getBitCast(C, Ty);
1401 return getTrunc(C, Ty);
1404 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1405 assert(S->getType()->isPointerTy() && "Invalid cast");
1406 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1408 if (Ty->isIntegerTy())
1409 return getPtrToInt(S, Ty);
1410 return getBitCast(S, Ty);
1413 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1415 assert(C->getType()->isIntOrIntVectorTy() &&
1416 Ty->isIntOrIntVectorTy() && "Invalid cast");
1417 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1418 unsigned DstBits = Ty->getScalarSizeInBits();
1419 Instruction::CastOps opcode =
1420 (SrcBits == DstBits ? Instruction::BitCast :
1421 (SrcBits > DstBits ? Instruction::Trunc :
1422 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1423 return getCast(opcode, C, Ty);
1426 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1427 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1429 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1430 unsigned DstBits = Ty->getScalarSizeInBits();
1431 if (SrcBits == DstBits)
1432 return C; // Avoid a useless cast
1433 Instruction::CastOps opcode =
1434 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1435 return getCast(opcode, C, Ty);
1438 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1440 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1441 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1443 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1444 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1445 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1446 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1447 "SrcTy must be larger than DestTy for Trunc!");
1449 return getFoldedCast(Instruction::Trunc, C, Ty);
1452 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1454 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1455 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1457 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1458 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1459 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1460 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1461 "SrcTy must be smaller than DestTy for SExt!");
1463 return getFoldedCast(Instruction::SExt, C, Ty);
1466 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1468 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1469 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1471 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1472 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1473 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1474 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1475 "SrcTy must be smaller than DestTy for ZExt!");
1477 return getFoldedCast(Instruction::ZExt, C, Ty);
1480 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1482 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1483 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1485 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1486 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1487 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1488 "This is an illegal floating point truncation!");
1489 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1492 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1494 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1495 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1497 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1498 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1499 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1500 "This is an illegal floating point extension!");
1501 return getFoldedCast(Instruction::FPExt, C, Ty);
1504 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1506 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1507 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1509 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1510 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1511 "This is an illegal uint to floating point cast!");
1512 return getFoldedCast(Instruction::UIToFP, C, Ty);
1515 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1517 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1518 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1520 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1521 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1522 "This is an illegal sint to floating point cast!");
1523 return getFoldedCast(Instruction::SIToFP, C, Ty);
1526 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1528 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1529 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1531 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1532 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1533 "This is an illegal floating point to uint cast!");
1534 return getFoldedCast(Instruction::FPToUI, C, Ty);
1537 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1539 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1540 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1542 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1543 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1544 "This is an illegal floating point to sint cast!");
1545 return getFoldedCast(Instruction::FPToSI, C, Ty);
1548 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1549 assert(C->getType()->getScalarType()->isPointerTy() &&
1550 "PtrToInt source must be pointer or pointer vector");
1551 assert(DstTy->getScalarType()->isIntegerTy() &&
1552 "PtrToInt destination must be integer or integer vector");
1553 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1554 if (isa<VectorType>(C->getType()))
1555 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1556 "Invalid cast between a different number of vector elements");
1557 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1560 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1561 assert(C->getType()->getScalarType()->isIntegerTy() &&
1562 "IntToPtr source must be integer or integer vector");
1563 assert(DstTy->getScalarType()->isPointerTy() &&
1564 "IntToPtr destination must be a pointer or pointer vector");
1565 assert(isa<VectorType>(C->getType()) == isa<VectorType>(DstTy));
1566 if (isa<VectorType>(C->getType()))
1567 assert(C->getType()->getVectorNumElements()==DstTy->getVectorNumElements()&&
1568 "Invalid cast between a different number of vector elements");
1569 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1572 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1573 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1574 "Invalid constantexpr bitcast!");
1576 // It is common to ask for a bitcast of a value to its own type, handle this
1578 if (C->getType() == DstTy) return C;
1580 return getFoldedCast(Instruction::BitCast, C, DstTy);
1583 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1585 // Check the operands for consistency first.
1586 assert(Opcode >= Instruction::BinaryOpsBegin &&
1587 Opcode < Instruction::BinaryOpsEnd &&
1588 "Invalid opcode in binary constant expression");
1589 assert(C1->getType() == C2->getType() &&
1590 "Operand types in binary constant expression should match");
1594 case Instruction::Add:
1595 case Instruction::Sub:
1596 case Instruction::Mul:
1597 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1598 assert(C1->getType()->isIntOrIntVectorTy() &&
1599 "Tried to create an integer operation on a non-integer type!");
1601 case Instruction::FAdd:
1602 case Instruction::FSub:
1603 case Instruction::FMul:
1604 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1605 assert(C1->getType()->isFPOrFPVectorTy() &&
1606 "Tried to create a floating-point operation on a "
1607 "non-floating-point type!");
1609 case Instruction::UDiv:
1610 case Instruction::SDiv:
1611 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1612 assert(C1->getType()->isIntOrIntVectorTy() &&
1613 "Tried to create an arithmetic operation on a non-arithmetic type!");
1615 case Instruction::FDiv:
1616 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1617 assert(C1->getType()->isFPOrFPVectorTy() &&
1618 "Tried to create an arithmetic operation on a non-arithmetic type!");
1620 case Instruction::URem:
1621 case Instruction::SRem:
1622 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1623 assert(C1->getType()->isIntOrIntVectorTy() &&
1624 "Tried to create an arithmetic operation on a non-arithmetic type!");
1626 case Instruction::FRem:
1627 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1628 assert(C1->getType()->isFPOrFPVectorTy() &&
1629 "Tried to create an arithmetic operation on a non-arithmetic type!");
1631 case Instruction::And:
1632 case Instruction::Or:
1633 case Instruction::Xor:
1634 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1635 assert(C1->getType()->isIntOrIntVectorTy() &&
1636 "Tried to create a logical operation on a non-integral type!");
1638 case Instruction::Shl:
1639 case Instruction::LShr:
1640 case Instruction::AShr:
1641 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1642 assert(C1->getType()->isIntOrIntVectorTy() &&
1643 "Tried to create a shift operation on a non-integer type!");
1650 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1651 return FC; // Fold a few common cases.
1653 std::vector<Constant*> argVec(1, C1);
1654 argVec.push_back(C2);
1655 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1657 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1658 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1661 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1662 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1663 // Note that a non-inbounds gep is used, as null isn't within any object.
1664 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1665 Constant *GEP = getGetElementPtr(
1666 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1667 return getPtrToInt(GEP,
1668 Type::getInt64Ty(Ty->getContext()));
1671 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1672 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1673 // Note that a non-inbounds gep is used, as null isn't within any object.
1675 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1676 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1677 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1678 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1679 Constant *Indices[2] = { Zero, One };
1680 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1681 return getPtrToInt(GEP,
1682 Type::getInt64Ty(Ty->getContext()));
1685 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1686 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1690 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1691 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1692 // Note that a non-inbounds gep is used, as null isn't within any object.
1693 Constant *GEPIdx[] = {
1694 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1697 Constant *GEP = getGetElementPtr(
1698 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1699 return getPtrToInt(GEP,
1700 Type::getInt64Ty(Ty->getContext()));
1703 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1704 Constant *C1, Constant *C2) {
1705 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1707 switch (Predicate) {
1708 default: llvm_unreachable("Invalid CmpInst predicate");
1709 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1710 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1711 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1712 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1713 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1714 case CmpInst::FCMP_TRUE:
1715 return getFCmp(Predicate, C1, C2);
1717 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1718 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1719 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1720 case CmpInst::ICMP_SLE:
1721 return getICmp(Predicate, C1, C2);
1725 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1726 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1728 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1729 return SC; // Fold common cases
1731 std::vector<Constant*> argVec(3, C);
1734 ExprMapKeyType Key(Instruction::Select, argVec);
1736 LLVMContextImpl *pImpl = C->getContext().pImpl;
1737 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1740 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1742 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1743 return FC; // Fold a few common cases.
1745 // Get the result type of the getelementptr!
1746 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1747 assert(Ty && "GEP indices invalid!");
1748 unsigned AS = C->getType()->getPointerAddressSpace();
1749 Type *ReqTy = Ty->getPointerTo(AS);
1751 assert(C->getType()->isPointerTy() &&
1752 "Non-pointer type for constant GetElementPtr expression");
1753 // Look up the constant in the table first to ensure uniqueness
1754 std::vector<Constant*> ArgVec;
1755 ArgVec.reserve(1 + Idxs.size());
1756 ArgVec.push_back(C);
1757 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1758 ArgVec.push_back(cast<Constant>(Idxs[i]));
1759 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1760 InBounds ? GEPOperator::IsInBounds : 0);
1762 LLVMContextImpl *pImpl = C->getContext().pImpl;
1763 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1767 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1768 assert(LHS->getType() == RHS->getType());
1769 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1770 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1772 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1773 return FC; // Fold a few common cases...
1775 // Look up the constant in the table first to ensure uniqueness
1776 std::vector<Constant*> ArgVec;
1777 ArgVec.push_back(LHS);
1778 ArgVec.push_back(RHS);
1779 // Get the key type with both the opcode and predicate
1780 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1782 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1783 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1784 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1786 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1787 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1791 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1792 assert(LHS->getType() == RHS->getType());
1793 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1795 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1796 return FC; // Fold a few common cases...
1798 // Look up the constant in the table first to ensure uniqueness
1799 std::vector<Constant*> ArgVec;
1800 ArgVec.push_back(LHS);
1801 ArgVec.push_back(RHS);
1802 // Get the key type with both the opcode and predicate
1803 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1805 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1806 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1807 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1809 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1810 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1813 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1814 assert(Val->getType()->isVectorTy() &&
1815 "Tried to create extractelement operation on non-vector type!");
1816 assert(Idx->getType()->isIntegerTy(32) &&
1817 "Extractelement index must be i32 type!");
1819 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1820 return FC; // Fold a few common cases.
1822 // Look up the constant in the table first to ensure uniqueness
1823 std::vector<Constant*> ArgVec(1, Val);
1824 ArgVec.push_back(Idx);
1825 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1827 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1828 Type *ReqTy = Val->getType()->getVectorElementType();
1829 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1832 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1834 assert(Val->getType()->isVectorTy() &&
1835 "Tried to create insertelement operation on non-vector type!");
1836 assert(Elt->getType() == Val->getType()->getVectorElementType() &&
1837 "Insertelement types must match!");
1838 assert(Idx->getType()->isIntegerTy(32) &&
1839 "Insertelement index must be i32 type!");
1841 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1842 return FC; // Fold a few common cases.
1843 // Look up the constant in the table first to ensure uniqueness
1844 std::vector<Constant*> ArgVec(1, Val);
1845 ArgVec.push_back(Elt);
1846 ArgVec.push_back(Idx);
1847 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1849 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1850 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1853 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1855 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1856 "Invalid shuffle vector constant expr operands!");
1858 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1859 return FC; // Fold a few common cases.
1861 unsigned NElts = Mask->getType()->getVectorNumElements();
1862 Type *EltTy = V1->getType()->getVectorElementType();
1863 Type *ShufTy = VectorType::get(EltTy, NElts);
1865 // Look up the constant in the table first to ensure uniqueness
1866 std::vector<Constant*> ArgVec(1, V1);
1867 ArgVec.push_back(V2);
1868 ArgVec.push_back(Mask);
1869 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1871 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1872 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1875 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1876 ArrayRef<unsigned> Idxs) {
1877 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1878 Idxs) == Val->getType() &&
1879 "insertvalue indices invalid!");
1880 assert(Agg->getType()->isFirstClassType() &&
1881 "Non-first-class type for constant insertvalue expression");
1882 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1883 assert(FC && "insertvalue constant expr couldn't be folded!");
1887 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1888 ArrayRef<unsigned> Idxs) {
1889 assert(Agg->getType()->isFirstClassType() &&
1890 "Tried to create extractelement operation on non-first-class type!");
1892 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1894 assert(ReqTy && "extractvalue indices invalid!");
1896 assert(Agg->getType()->isFirstClassType() &&
1897 "Non-first-class type for constant extractvalue expression");
1898 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1899 assert(FC && "ExtractValue constant expr couldn't be folded!");
1903 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1904 assert(C->getType()->isIntOrIntVectorTy() &&
1905 "Cannot NEG a nonintegral value!");
1906 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1910 Constant *ConstantExpr::getFNeg(Constant *C) {
1911 assert(C->getType()->isFPOrFPVectorTy() &&
1912 "Cannot FNEG a non-floating-point value!");
1913 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1916 Constant *ConstantExpr::getNot(Constant *C) {
1917 assert(C->getType()->isIntOrIntVectorTy() &&
1918 "Cannot NOT a nonintegral value!");
1919 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1922 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1923 bool HasNUW, bool HasNSW) {
1924 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1925 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1926 return get(Instruction::Add, C1, C2, Flags);
1929 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1930 return get(Instruction::FAdd, C1, C2);
1933 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1934 bool HasNUW, bool HasNSW) {
1935 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1936 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1937 return get(Instruction::Sub, C1, C2, Flags);
1940 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1941 return get(Instruction::FSub, C1, C2);
1944 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1945 bool HasNUW, bool HasNSW) {
1946 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1947 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1948 return get(Instruction::Mul, C1, C2, Flags);
1951 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1952 return get(Instruction::FMul, C1, C2);
1955 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1956 return get(Instruction::UDiv, C1, C2,
1957 isExact ? PossiblyExactOperator::IsExact : 0);
1960 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1961 return get(Instruction::SDiv, C1, C2,
1962 isExact ? PossiblyExactOperator::IsExact : 0);
1965 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1966 return get(Instruction::FDiv, C1, C2);
1969 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1970 return get(Instruction::URem, C1, C2);
1973 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1974 return get(Instruction::SRem, C1, C2);
1977 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1978 return get(Instruction::FRem, C1, C2);
1981 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1982 return get(Instruction::And, C1, C2);
1985 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1986 return get(Instruction::Or, C1, C2);
1989 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1990 return get(Instruction::Xor, C1, C2);
1993 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1994 bool HasNUW, bool HasNSW) {
1995 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1996 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1997 return get(Instruction::Shl, C1, C2, Flags);
2000 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
2001 return get(Instruction::LShr, C1, C2,
2002 isExact ? PossiblyExactOperator::IsExact : 0);
2005 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
2006 return get(Instruction::AShr, C1, C2,
2007 isExact ? PossiblyExactOperator::IsExact : 0);
2010 /// getBinOpIdentity - Return the identity for the given binary operation,
2011 /// i.e. a constant C such that X op C = X and C op X = X for every X. It
2012 /// returns null if the operator doesn't have an identity.
2013 Constant *ConstantExpr::getBinOpIdentity(unsigned Opcode, Type *Ty) {
2016 // Doesn't have an identity.
2019 case Instruction::Add:
2020 case Instruction::Or:
2021 case Instruction::Xor:
2022 return Constant::getNullValue(Ty);
2024 case Instruction::Mul:
2025 return ConstantInt::get(Ty, 1);
2027 case Instruction::And:
2028 return Constant::getAllOnesValue(Ty);
2032 /// getBinOpAbsorber - Return the absorbing element for the given binary
2033 /// operation, i.e. a constant C such that X op C = C and C op X = C for
2034 /// every X. For example, this returns zero for integer multiplication.
2035 /// It returns null if the operator doesn't have an absorbing element.
2036 Constant *ConstantExpr::getBinOpAbsorber(unsigned Opcode, Type *Ty) {
2039 // Doesn't have an absorber.
2042 case Instruction::Or:
2043 return Constant::getAllOnesValue(Ty);
2045 case Instruction::And:
2046 case Instruction::Mul:
2047 return Constant::getNullValue(Ty);
2051 // destroyConstant - Remove the constant from the constant table...
2053 void ConstantExpr::destroyConstant() {
2054 getType()->getContext().pImpl->ExprConstants.remove(this);
2055 destroyConstantImpl();
2058 const char *ConstantExpr::getOpcodeName() const {
2059 return Instruction::getOpcodeName(getOpcode());
2064 GetElementPtrConstantExpr::
2065 GetElementPtrConstantExpr(Constant *C, ArrayRef<Constant*> IdxList,
2067 : ConstantExpr(DestTy, Instruction::GetElementPtr,
2068 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
2069 - (IdxList.size()+1), IdxList.size()+1) {
2071 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
2072 OperandList[i+1] = IdxList[i];
2075 //===----------------------------------------------------------------------===//
2076 // ConstantData* implementations
2078 void ConstantDataArray::anchor() {}
2079 void ConstantDataVector::anchor() {}
2081 /// getElementType - Return the element type of the array/vector.
2082 Type *ConstantDataSequential::getElementType() const {
2083 return getType()->getElementType();
2086 StringRef ConstantDataSequential::getRawDataValues() const {
2087 return StringRef(DataElements, getNumElements()*getElementByteSize());
2090 /// isElementTypeCompatible - Return true if a ConstantDataSequential can be
2091 /// formed with a vector or array of the specified element type.
2092 /// ConstantDataArray only works with normal float and int types that are
2093 /// stored densely in memory, not with things like i42 or x86_f80.
2094 bool ConstantDataSequential::isElementTypeCompatible(const Type *Ty) {
2095 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
2096 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
2097 switch (IT->getBitWidth()) {
2109 /// getNumElements - Return the number of elements in the array or vector.
2110 unsigned ConstantDataSequential::getNumElements() const {
2111 if (ArrayType *AT = dyn_cast<ArrayType>(getType()))
2112 return AT->getNumElements();
2113 return getType()->getVectorNumElements();
2117 /// getElementByteSize - Return the size in bytes of the elements in the data.
2118 uint64_t ConstantDataSequential::getElementByteSize() const {
2119 return getElementType()->getPrimitiveSizeInBits()/8;
2122 /// getElementPointer - Return the start of the specified element.
2123 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
2124 assert(Elt < getNumElements() && "Invalid Elt");
2125 return DataElements+Elt*getElementByteSize();
2129 /// isAllZeros - return true if the array is empty or all zeros.
2130 static bool isAllZeros(StringRef Arr) {
2131 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
2137 /// getImpl - This is the underlying implementation of all of the
2138 /// ConstantDataSequential::get methods. They all thunk down to here, providing
2139 /// the correct element type. We take the bytes in as a StringRef because
2140 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
2141 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
2142 assert(isElementTypeCompatible(Ty->getSequentialElementType()));
2143 // If the elements are all zero or there are no elements, return a CAZ, which
2144 // is more dense and canonical.
2145 if (isAllZeros(Elements))
2146 return ConstantAggregateZero::get(Ty);
2148 // Do a lookup to see if we have already formed one of these.
2149 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
2150 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
2152 // The bucket can point to a linked list of different CDS's that have the same
2153 // body but different types. For example, 0,0,0,1 could be a 4 element array
2154 // of i8, or a 1-element array of i32. They'll both end up in the same
2155 /// StringMap bucket, linked up by their Next pointers. Walk the list.
2156 ConstantDataSequential **Entry = &Slot.getValue();
2157 for (ConstantDataSequential *Node = *Entry; Node != 0;
2158 Entry = &Node->Next, Node = *Entry)
2159 if (Node->getType() == Ty)
2162 // Okay, we didn't get a hit. Create a node of the right class, link it in,
2164 if (isa<ArrayType>(Ty))
2165 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
2167 assert(isa<VectorType>(Ty));
2168 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
2171 void ConstantDataSequential::destroyConstant() {
2172 // Remove the constant from the StringMap.
2173 StringMap<ConstantDataSequential*> &CDSConstants =
2174 getType()->getContext().pImpl->CDSConstants;
2176 StringMap<ConstantDataSequential*>::iterator Slot =
2177 CDSConstants.find(getRawDataValues());
2179 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2181 ConstantDataSequential **Entry = &Slot->getValue();
2183 // Remove the entry from the hash table.
2184 if ((*Entry)->Next == 0) {
2185 // If there is only one value in the bucket (common case) it must be this
2186 // entry, and removing the entry should remove the bucket completely.
2187 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2188 getContext().pImpl->CDSConstants.erase(Slot);
2190 // Otherwise, there are multiple entries linked off the bucket, unlink the
2191 // node we care about but keep the bucket around.
2192 for (ConstantDataSequential *Node = *Entry; ;
2193 Entry = &Node->Next, Node = *Entry) {
2194 assert(Node && "Didn't find entry in its uniquing hash table!");
2195 // If we found our entry, unlink it from the list and we're done.
2197 *Entry = Node->Next;
2203 // If we were part of a list, make sure that we don't delete the list that is
2204 // still owned by the uniquing map.
2207 // Finally, actually delete it.
2208 destroyConstantImpl();
2211 /// get() constructors - Return a constant with array type with an element
2212 /// count and element type matching the ArrayRef passed in. Note that this
2213 /// can return a ConstantAggregateZero object.
2214 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint8_t> Elts) {
2215 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2216 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2218 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2219 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2220 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2222 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2223 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2224 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2226 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2227 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2228 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2230 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<float> Elts) {
2231 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2232 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2234 Constant *ConstantDataArray::get(LLVMContext &Context, ArrayRef<double> Elts) {
2235 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2236 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2239 /// getString - This method constructs a CDS and initializes it with a text
2240 /// string. The default behavior (AddNull==true) causes a null terminator to
2241 /// be placed at the end of the array (increasing the length of the string by
2242 /// one more than the StringRef would normally indicate. Pass AddNull=false
2243 /// to disable this behavior.
2244 Constant *ConstantDataArray::getString(LLVMContext &Context,
2245 StringRef Str, bool AddNull) {
2247 return get(Context, ArrayRef<uint8_t>((uint8_t*)Str.data(), Str.size()));
2249 SmallVector<uint8_t, 64> ElementVals;
2250 ElementVals.append(Str.begin(), Str.end());
2251 ElementVals.push_back(0);
2252 return get(Context, ElementVals);
2255 /// get() constructors - Return a constant with vector type with an element
2256 /// count and element type matching the ArrayRef passed in. Note that this
2257 /// can return a ConstantAggregateZero object.
2258 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint8_t> Elts){
2259 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2260 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2262 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint16_t> Elts){
2263 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2264 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2266 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint32_t> Elts){
2267 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2268 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2270 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<uint64_t> Elts){
2271 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2272 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2274 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<float> Elts) {
2275 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2276 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2278 Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
2279 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2280 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2283 Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
2284 assert(isElementTypeCompatible(V->getType()) &&
2285 "Element type not compatible with ConstantData");
2286 if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2287 if (CI->getType()->isIntegerTy(8)) {
2288 SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
2289 return get(V->getContext(), Elts);
2291 if (CI->getType()->isIntegerTy(16)) {
2292 SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
2293 return get(V->getContext(), Elts);
2295 if (CI->getType()->isIntegerTy(32)) {
2296 SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
2297 return get(V->getContext(), Elts);
2299 assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
2300 SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
2301 return get(V->getContext(), Elts);
2304 if (ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
2305 if (CFP->getType()->isFloatTy()) {
2306 SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
2307 return get(V->getContext(), Elts);
2309 if (CFP->getType()->isDoubleTy()) {
2310 SmallVector<double, 16> Elts(NumElts,
2311 CFP->getValueAPF().convertToDouble());
2312 return get(V->getContext(), Elts);
2315 return ConstantVector::getSplat(NumElts, V);
2319 /// getElementAsInteger - If this is a sequential container of integers (of
2320 /// any size), return the specified element in the low bits of a uint64_t.
2321 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2322 assert(isa<IntegerType>(getElementType()) &&
2323 "Accessor can only be used when element is an integer");
2324 const char *EltPtr = getElementPointer(Elt);
2326 // The data is stored in host byte order, make sure to cast back to the right
2327 // type to load with the right endianness.
2328 switch (getElementType()->getIntegerBitWidth()) {
2329 default: llvm_unreachable("Invalid bitwidth for CDS");
2330 case 8: return *(uint8_t*)EltPtr;
2331 case 16: return *(uint16_t*)EltPtr;
2332 case 32: return *(uint32_t*)EltPtr;
2333 case 64: return *(uint64_t*)EltPtr;
2337 /// getElementAsAPFloat - If this is a sequential container of floating point
2338 /// type, return the specified element as an APFloat.
2339 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2340 const char *EltPtr = getElementPointer(Elt);
2342 switch (getElementType()->getTypeID()) {
2344 llvm_unreachable("Accessor can only be used when element is float/double!");
2345 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2346 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2350 /// getElementAsFloat - If this is an sequential container of floats, return
2351 /// the specified element as a float.
2352 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2353 assert(getElementType()->isFloatTy() &&
2354 "Accessor can only be used when element is a 'float'");
2355 return *(float*)getElementPointer(Elt);
2358 /// getElementAsDouble - If this is an sequential container of doubles, return
2359 /// the specified element as a float.
2360 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2361 assert(getElementType()->isDoubleTy() &&
2362 "Accessor can only be used when element is a 'float'");
2363 return *(double*)getElementPointer(Elt);
2366 /// getElementAsConstant - Return a Constant for a specified index's element.
2367 /// Note that this has to compute a new constant to return, so it isn't as
2368 /// efficient as getElementAsInteger/Float/Double.
2369 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2370 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2371 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2373 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2376 /// isString - This method returns true if this is an array of i8.
2377 bool ConstantDataSequential::isString() const {
2378 return isa<ArrayType>(getType()) && getElementType()->isIntegerTy(8);
2381 /// isCString - This method returns true if the array "isString", ends with a
2382 /// nul byte, and does not contains any other nul bytes.
2383 bool ConstantDataSequential::isCString() const {
2387 StringRef Str = getAsString();
2389 // The last value must be nul.
2390 if (Str.back() != 0) return false;
2392 // Other elements must be non-nul.
2393 return Str.drop_back().find(0) == StringRef::npos;
2396 /// getSplatValue - If this is a splat constant, meaning that all of the
2397 /// elements have the same value, return that value. Otherwise return NULL.
2398 Constant *ConstantDataVector::getSplatValue() const {
2399 const char *Base = getRawDataValues().data();
2401 // Compare elements 1+ to the 0'th element.
2402 unsigned EltSize = getElementByteSize();
2403 for (unsigned i = 1, e = getNumElements(); i != e; ++i)
2404 if (memcmp(Base, Base+i*EltSize, EltSize))
2407 // If they're all the same, return the 0th one as a representative.
2408 return getElementAsConstant(0);
2411 //===----------------------------------------------------------------------===//
2412 // replaceUsesOfWithOnConstant implementations
2414 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2415 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2418 /// Note that we intentionally replace all uses of From with To here. Consider
2419 /// a large array that uses 'From' 1000 times. By handling this case all here,
2420 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2421 /// single invocation handles all 1000 uses. Handling them one at a time would
2422 /// work, but would be really slow because it would have to unique each updated
2425 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2427 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2428 Constant *ToC = cast<Constant>(To);
2430 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2432 SmallVector<Constant*, 8> Values;
2433 LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup;
2434 Lookup.first = cast<ArrayType>(getType());
2435 Values.reserve(getNumOperands()); // Build replacement array.
2437 // Fill values with the modified operands of the constant array. Also,
2438 // compute whether this turns into an all-zeros array.
2439 unsigned NumUpdated = 0;
2441 // Keep track of whether all the values in the array are "ToC".
2442 bool AllSame = true;
2443 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2444 Constant *Val = cast<Constant>(O->get());
2449 Values.push_back(Val);
2450 AllSame &= Val == ToC;
2453 Constant *Replacement = 0;
2454 if (AllSame && ToC->isNullValue()) {
2455 Replacement = ConstantAggregateZero::get(getType());
2456 } else if (AllSame && isa<UndefValue>(ToC)) {
2457 Replacement = UndefValue::get(getType());
2459 // Check to see if we have this array type already.
2460 Lookup.second = makeArrayRef(Values);
2461 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2462 pImpl->ArrayConstants.find(Lookup);
2464 if (I != pImpl->ArrayConstants.map_end()) {
2465 Replacement = I->first;
2467 // Okay, the new shape doesn't exist in the system yet. Instead of
2468 // creating a new constant array, inserting it, replaceallusesof'ing the
2469 // old with the new, then deleting the old... just update the current one
2471 pImpl->ArrayConstants.remove(this);
2473 // Update to the new value. Optimize for the case when we have a single
2474 // operand that we're changing, but handle bulk updates efficiently.
2475 if (NumUpdated == 1) {
2476 unsigned OperandToUpdate = U - OperandList;
2477 assert(getOperand(OperandToUpdate) == From &&
2478 "ReplaceAllUsesWith broken!");
2479 setOperand(OperandToUpdate, ToC);
2481 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2482 if (getOperand(i) == From)
2485 pImpl->ArrayConstants.insert(this);
2490 // Otherwise, I do need to replace this with an existing value.
2491 assert(Replacement != this && "I didn't contain From!");
2493 // Everyone using this now uses the replacement.
2494 replaceAllUsesWith(Replacement);
2496 // Delete the old constant!
2500 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2502 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2503 Constant *ToC = cast<Constant>(To);
2505 unsigned OperandToUpdate = U-OperandList;
2506 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2508 SmallVector<Constant*, 8> Values;
2509 LLVMContextImpl::StructConstantsTy::LookupKey Lookup;
2510 Lookup.first = cast<StructType>(getType());
2511 Values.reserve(getNumOperands()); // Build replacement struct.
2513 // Fill values with the modified operands of the constant struct. Also,
2514 // compute whether this turns into an all-zeros struct.
2515 bool isAllZeros = false;
2516 bool isAllUndef = false;
2517 if (ToC->isNullValue()) {
2519 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2520 Constant *Val = cast<Constant>(O->get());
2521 Values.push_back(Val);
2522 if (isAllZeros) isAllZeros = Val->isNullValue();
2524 } else if (isa<UndefValue>(ToC)) {
2526 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2527 Constant *Val = cast<Constant>(O->get());
2528 Values.push_back(Val);
2529 if (isAllUndef) isAllUndef = isa<UndefValue>(Val);
2532 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2533 Values.push_back(cast<Constant>(O->get()));
2535 Values[OperandToUpdate] = ToC;
2537 LLVMContextImpl *pImpl = getContext().pImpl;
2539 Constant *Replacement = 0;
2541 Replacement = ConstantAggregateZero::get(getType());
2542 } else if (isAllUndef) {
2543 Replacement = UndefValue::get(getType());
2545 // Check to see if we have this struct type already.
2546 Lookup.second = makeArrayRef(Values);
2547 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2548 pImpl->StructConstants.find(Lookup);
2550 if (I != pImpl->StructConstants.map_end()) {
2551 Replacement = I->first;
2553 // Okay, the new shape doesn't exist in the system yet. Instead of
2554 // creating a new constant struct, inserting it, replaceallusesof'ing the
2555 // old with the new, then deleting the old... just update the current one
2557 pImpl->StructConstants.remove(this);
2559 // Update to the new value.
2560 setOperand(OperandToUpdate, ToC);
2561 pImpl->StructConstants.insert(this);
2566 assert(Replacement != this && "I didn't contain From!");
2568 // Everyone using this now uses the replacement.
2569 replaceAllUsesWith(Replacement);
2571 // Delete the old constant!
2575 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2577 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2579 SmallVector<Constant*, 8> Values;
2580 Values.reserve(getNumOperands()); // Build replacement array...
2581 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2582 Constant *Val = getOperand(i);
2583 if (Val == From) Val = cast<Constant>(To);
2584 Values.push_back(Val);
2587 Constant *Replacement = get(Values);
2588 assert(Replacement != this && "I didn't contain From!");
2590 // Everyone using this now uses the replacement.
2591 replaceAllUsesWith(Replacement);
2593 // Delete the old constant!
2597 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2599 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2600 Constant *To = cast<Constant>(ToV);
2602 SmallVector<Constant*, 8> NewOps;
2603 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2604 Constant *Op = getOperand(i);
2605 NewOps.push_back(Op == From ? To : Op);
2608 Constant *Replacement = getWithOperands(NewOps);
2609 assert(Replacement != this && "I didn't contain From!");
2611 // Everyone using this now uses the replacement.
2612 replaceAllUsesWith(Replacement);
2614 // Delete the old constant!