//===-- Constants.cpp - Implement Constant nodes --------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file implements the Constant* classes...
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
-#include "llvm/ConstantHandling.h"
+#include "ConstantFolding.h"
#include "llvm/DerivedTypes.h"
#include "llvm/iMemory.h"
#include "llvm/SymbolTable.h"
#include "llvm/Module.h"
#include "Support/StringExtras.h"
#include <algorithm>
+using namespace llvm;
ConstantBool *ConstantBool::True = new ConstantBool(true);
ConstantBool *ConstantBool::False = new ConstantBool(false);
case Type::PointerTyID:
return ConstantPointerNull::get(cast<PointerType>(Ty));
- case Type::StructTyID: {
- const StructType *ST = cast<StructType>(Ty);
- const StructType::ElementTypes &ETs = ST->getElementTypes();
- std::vector<Constant*> Elements;
- Elements.resize(ETs.size());
- for (unsigned i = 0, e = ETs.size(); i != e; ++i)
- Elements[i] = Constant::getNullValue(ETs[i]);
- return ConstantStruct::get(ST, Elements);
- }
- case Type::ArrayTyID: {
- const ArrayType *AT = cast<ArrayType>(Ty);
- Constant *El = Constant::getNullValue(AT->getElementType());
- unsigned NumElements = AT->getNumElements();
- return ConstantArray::get(AT, std::vector<Constant*>(NumElements, El));
- }
+ case Type::StructTyID:
+ case Type::ArrayTyID:
+ return ConstantAggregateZero::get(Ty);
default:
// Function, Type, Label, or Opaque type?
assert(0 && "Cannot create a null constant of that type!");
ConstantStruct::ConstantStruct(const StructType *T,
const std::vector<Constant*> &V) : Constant(T) {
- const StructType::ElementTypes &ETypes = T->getElementTypes();
- assert(V.size() == ETypes.size() &&
+ assert(V.size() == T->getNumElements() &&
"Invalid initializer vector for constant structure");
Operands.reserve(V.size());
for (unsigned i = 0, e = V.size(); i != e; ++i) {
- assert((V[i]->getType() == ETypes[i] ||
- (ETypes[i]->isAbstract() &&
- ETypes[i]->getPrimitiveID()==V[i]->getType()->getPrimitiveID())) &&
+ assert((V[i]->getType() == T->getElementType(i) ||
+ ((T->getElementType(i)->isAbstract() ||
+ V[i]->getType()->isAbstract()) &&
+ T->getElementType(i)->getPrimitiveID() ==
+ V[i]->getType()->getPrimitiveID())) &&
"Initializer for struct element doesn't match struct element type!");
Operands.push_back(Use(V[i], this));
}
}
ConstantPointerRef::ConstantPointerRef(GlobalValue *GV)
- : ConstantPointer(GV->getType()) {
+ : Constant(GV->getType()) {
+ Operands.reserve(1);
Operands.push_back(Use(GV, this));
}
ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
: Constant(Ty), iType(Opcode) {
+ Operands.reserve(1);
Operands.push_back(Use(C, this));
}
+// Select instruction creation ctor
+ConstantExpr::ConstantExpr(Constant *C, Constant *V1, Constant *V2)
+ : Constant(V1->getType()), iType(Instruction::Select) {
+ Operands.reserve(3);
+ Operands.push_back(Use(C, this));
+ Operands.push_back(Use(V1, this));
+ Operands.push_back(Use(V2, this));
+}
+
+
static bool isSetCC(unsigned Opcode) {
return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE ||
Opcode == Instruction::SetLT || Opcode == Instruction::SetGT ||
ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
: Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) {
+ Operands.reserve(2);
Operands.push_back(Use(C1, this));
Operands.push_back(Use(C2, this));
}
Operands.push_back(Use(IdxList[i], this));
}
+/// ConstantExpr::get* - Return some common constants without having to
+/// specify the full Instruction::OPCODE identifier.
+///
+Constant *ConstantExpr::getNeg(Constant *C) {
+ if (!C->getType()->isFloatingPoint())
+ return get(Instruction::Sub, getNullValue(C->getType()), C);
+ else
+ return get(Instruction::Sub, ConstantFP::get(C->getType(), -0.0), C);
+}
+Constant *ConstantExpr::getNot(Constant *C) {
+ assert(isa<ConstantIntegral>(C) && "Cannot NOT a nonintegral type!");
+ return get(Instruction::Xor, C,
+ ConstantIntegral::getAllOnesValue(C->getType()));
+}
+Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2) {
+ return get(Instruction::Add, C1, C2);
+}
+Constant *ConstantExpr::getSub(Constant *C1, Constant *C2) {
+ return get(Instruction::Sub, C1, C2);
+}
+Constant *ConstantExpr::getMul(Constant *C1, Constant *C2) {
+ return get(Instruction::Mul, C1, C2);
+}
+Constant *ConstantExpr::getDiv(Constant *C1, Constant *C2) {
+ return get(Instruction::Div, C1, C2);
+}
+Constant *ConstantExpr::getRem(Constant *C1, Constant *C2) {
+ return get(Instruction::Rem, C1, C2);
+}
+Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
+ return get(Instruction::And, C1, C2);
+}
+Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
+ return get(Instruction::Or, C1, C2);
+}
+Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
+ return get(Instruction::Xor, C1, C2);
+}
+Constant *ConstantExpr::getSetEQ(Constant *C1, Constant *C2) {
+ return get(Instruction::SetEQ, C1, C2);
+}
+Constant *ConstantExpr::getSetNE(Constant *C1, Constant *C2) {
+ return get(Instruction::SetNE, C1, C2);
+}
+Constant *ConstantExpr::getSetLT(Constant *C1, Constant *C2) {
+ return get(Instruction::SetLT, C1, C2);
+}
+Constant *ConstantExpr::getSetGT(Constant *C1, Constant *C2) {
+ return get(Instruction::SetGT, C1, C2);
+}
+Constant *ConstantExpr::getSetLE(Constant *C1, Constant *C2) {
+ return get(Instruction::SetLE, C1, C2);
+}
+Constant *ConstantExpr::getSetGE(Constant *C1, Constant *C2) {
+ return get(Instruction::SetGE, C1, C2);
+}
+Constant *ConstantExpr::getShl(Constant *C1, Constant *C2) {
+ return get(Instruction::Shl, C1, C2);
+}
+Constant *ConstantExpr::getShr(Constant *C1, Constant *C2) {
+ return get(Instruction::Shr, C1, C2);
+}
+
+Constant *ConstantExpr::getUShr(Constant *C1, Constant *C2) {
+ if (C1->getType()->isUnsigned()) return getShr(C1, C2);
+ return getCast(getShr(getCast(C1,
+ C1->getType()->getUnsignedVersion()), C2), C1->getType());
+}
+
+Constant *ConstantExpr::getSShr(Constant *C1, Constant *C2) {
+ if (C1->getType()->isSigned()) return getShr(C1, C2);
+ return getCast(getShr(getCast(C1,
+ C1->getType()->getSignedVersion()), C2), C1->getType());
+}
//===----------------------------------------------------------------------===//
return ((Ty == Type::FloatTy || Ty == Type::DoubleTy) &&
!isa<ConstantExpr>(CPV));
}
+bool ConstantAggregateZero::classof(const Constant *CPV) {
+ return (isa<ArrayType>(CPV->getType()) || isa<StructType>(CPV->getType())) &&
+ CPV->isNullValue();
+}
bool ConstantArray::classof(const Constant *CPV) {
- return isa<ArrayType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
+ return isa<ArrayType>(CPV->getType()) && !CPV->isNullValue();
}
bool ConstantStruct::classof(const Constant *CPV) {
- return isa<StructType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
+ return isa<StructType>(CPV->getType()) && !CPV->isNullValue();
}
-bool ConstantPointer::classof(const Constant *CPV) {
- return (isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV));
+
+bool ConstantPointerNull::classof(const Constant *CPV) {
+ return isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV) &&
+ CPV->getNumOperands() == 0;
+}
+
+bool ConstantPointerRef::classof(const Constant *CPV) {
+ return isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV) &&
+ CPV->getNumOperands() == 1;
}
Values.push_back(Val);
}
- ConstantArray *Replacement = ConstantArray::get(getType(), Values);
+ Constant *Replacement = ConstantArray::get(getType(), Values);
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...
Values.push_back(Val);
}
- ConstantStruct *Replacement = ConstantStruct::get(getType(), Values);
+ Constant *Replacement = ConstantStruct::get(getType(), Values);
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...
} else if (getOpcode() == Instruction::Cast) {
assert(getOperand(0) == From && "Cast only has one use!");
Replacement = ConstantExpr::getCast(To, getType());
+ } else if (getOpcode() == Instruction::Select) {
+ Constant *C1 = getOperand(0);
+ Constant *C2 = getOperand(1);
+ Constant *C3 = getOperand(2);
+ if (C1 == From) C1 = To;
+ if (C2 == From) C2 = To;
+ if (C3 == From) C3 = To;
+ Replacement = ConstantExpr::getSelect(C1, C2, C3);
} else if (getNumOperands() == 2) {
Constant *C1 = getOperand(0);
Constant *C2 = getOperand(1);
// something strange that needs to be done to interface to the ctor for the
// constant.
//
-template<class ConstantClass, class TypeClass, class ValType>
-struct ConstantCreator {
- static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
- return new ConstantClass(Ty, V);
- }
-};
-
-template<class ConstantClass, class TypeClass>
-struct ConvertConstantType {
- static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
- assert(0 && "This type cannot be converted!\n");
- abort();
- }
-};
+namespace llvm {
+ template<class ConstantClass, class TypeClass, class ValType>
+ struct ConstantCreator {
+ static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
+ return new ConstantClass(Ty, V);
+ }
+ };
+
+ template<class ConstantClass, class TypeClass>
+ struct ConvertConstantType {
+ static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
+ assert(0 && "This type cannot be converted!\n");
+ abort();
+ }
+ };
+}
namespace {
template<class ValType, class TypeClass, class ConstantClass>
//---- ConstantFP::get() implementation...
//
-static ValueMap<double, Type, ConstantFP> FPConstants;
+namespace llvm {
+ template<>
+ struct ConstantCreator<ConstantFP, Type, uint64_t> {
+ static ConstantFP *create(const Type *Ty, uint64_t V) {
+ assert(Ty == Type::DoubleTy);
+ union {
+ double F;
+ uint64_t I;
+ } T;
+ T.I = V;
+ return new ConstantFP(Ty, T.F);
+ }
+ };
+ template<>
+ struct ConstantCreator<ConstantFP, Type, uint32_t> {
+ static ConstantFP *create(const Type *Ty, uint32_t V) {
+ assert(Ty == Type::FloatTy);
+ union {
+ float F;
+ uint32_t I;
+ } T;
+ T.I = V;
+ return new ConstantFP(Ty, T.F);
+ }
+ };
+}
+
+static ValueMap<uint64_t, Type, ConstantFP> DoubleConstants;
+static ValueMap<uint32_t, Type, ConstantFP> FloatConstants;
ConstantFP *ConstantFP::get(const Type *Ty, double V) {
- return FPConstants.getOrCreate(Ty, V);
+ if (Ty == Type::FloatTy) {
+ // Force the value through memory to normalize it.
+ union {
+ float F;
+ uint32_t I;
+ } T;
+ T.F = (float)V;
+ return FloatConstants.getOrCreate(Ty, T.I);
+ } else {
+ assert(Ty == Type::DoubleTy);
+ union {
+ double F;
+ uint64_t I;
+ } T;
+ T.F = V;
+ return DoubleConstants.getOrCreate(Ty, T.I);
+ }
}
-//---- ConstantArray::get() implementation...
+//---- ConstantAggregateZero::get() implementation...
//
+namespace llvm {
+ // ConstantAggregateZero does not take extra "value" argument...
+ template<class ValType>
+ struct ConstantCreator<ConstantAggregateZero, Type, ValType> {
+ static ConstantAggregateZero *create(const Type *Ty, const ValType &V){
+ return new ConstantAggregateZero(Ty);
+ }
+ };
-template<>
-struct ConvertConstantType<ConstantArray, ArrayType> {
- static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
- // Make everyone now use a constant of the new type...
- std::vector<Constant*> C;
- for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
- C.push_back(cast<Constant>(OldC->getOperand(i)));
- Constant *New = ConstantArray::get(NewTy, C);
- assert(New != OldC && "Didn't replace constant??");
- OldC->uncheckedReplaceAllUsesWith(New);
- OldC->destroyConstant(); // This constant is now dead, destroy it.
- }
-};
+ template<>
+ struct ConvertConstantType<ConstantAggregateZero, Type> {
+ static void convert(ConstantAggregateZero *OldC, const Type *NewTy) {
+ // Make everyone now use a constant of the new type...
+ Constant *New = ConstantAggregateZero::get(NewTy);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+ };
+}
+static ValueMap<char, Type, ConstantAggregateZero> AggZeroConstants;
+
+Constant *ConstantAggregateZero::get(const Type *Ty) {
+ return AggZeroConstants.getOrCreate(Ty, 0);
+}
+
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantAggregateZero::destroyConstant() {
+ AggZeroConstants.remove(this);
+ destroyConstantImpl();
+}
+
+void ConstantAggregateZero::replaceUsesOfWithOnConstant(Value *From, Value *To,
+ bool DisableChecking) {
+ assert(0 && "No uses!");
+ abort();
+}
+
+
+
+//---- ConstantArray::get() implementation...
+//
+namespace llvm {
+ template<>
+ struct ConvertConstantType<ConstantArray, ArrayType> {
+ static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantArray::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+ };
+}
static ValueMap<std::vector<Constant*>, ArrayType,
ConstantArray> ArrayConstants;
-ConstantArray *ConstantArray::get(const ArrayType *Ty,
- const std::vector<Constant*> &V) {
- return ArrayConstants.getOrCreate(Ty, V);
+Constant *ConstantArray::get(const ArrayType *Ty,
+ const std::vector<Constant*> &V) {
+ // If this is an all-zero array, return a ConstantAggregateZero object
+ if (!V.empty()) {
+ Constant *C = V[0];
+ if (!C->isNullValue())
+ return ArrayConstants.getOrCreate(Ty, V);
+ for (unsigned i = 1, e = V.size(); i != e; ++i)
+ if (V[i] != C)
+ return ArrayConstants.getOrCreate(Ty, V);
+ }
+ return ConstantAggregateZero::get(Ty);
}
// destroyConstant - Remove the constant from the constant table...
// contain the specified string. A null terminator is added to the specified
// string so that it may be used in a natural way...
//
-ConstantArray *ConstantArray::get(const std::string &Str) {
+Constant *ConstantArray::get(const std::string &Str) {
std::vector<Constant*> ElementVals;
for (unsigned i = 0; i < Str.length(); ++i)
return ConstantArray::get(ATy, ElementVals);
}
+/// isString - This method returns true if the array is an array of sbyte or
+/// ubyte, and if the elements of the array are all ConstantInt's.
+bool ConstantArray::isString() const {
+ // Check the element type for sbyte or ubyte...
+ if (getType()->getElementType() != Type::UByteTy &&
+ getType()->getElementType() != Type::SByteTy)
+ return false;
+ // Check the elements to make sure they are all integers, not constant
+ // expressions.
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ if (!isa<ConstantInt>(getOperand(i)))
+ return false;
+ return true;
+}
+
// getAsString - If the sub-element type of this array is either sbyte or ubyte,
// then this method converts the array to an std::string and returns it.
// Otherwise, it asserts out.
//
std::string ConstantArray::getAsString() const {
- assert((getType()->getElementType() == Type::UByteTy ||
- getType()->getElementType() == Type::SByteTy) && "Not a string!");
-
+ assert(isString() && "Not a string!");
std::string Result;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue();
//---- ConstantStruct::get() implementation...
//
-template<>
-struct ConvertConstantType<ConstantStruct, StructType> {
- static void convert(ConstantStruct *OldC, const StructType *NewTy) {
- // Make everyone now use a constant of the new type...
- std::vector<Constant*> C;
- for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
- C.push_back(cast<Constant>(OldC->getOperand(i)));
- Constant *New = ConstantStruct::get(NewTy, C);
- assert(New != OldC && "Didn't replace constant??");
-
- OldC->uncheckedReplaceAllUsesWith(New);
- OldC->destroyConstant(); // This constant is now dead, destroy it.
- }
-};
+namespace llvm {
+ template<>
+ struct ConvertConstantType<ConstantStruct, StructType> {
+ static void convert(ConstantStruct *OldC, const StructType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantStruct::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+ };
+}
static ValueMap<std::vector<Constant*>, StructType,
ConstantStruct> StructConstants;
-ConstantStruct *ConstantStruct::get(const StructType *Ty,
- const std::vector<Constant*> &V) {
- return StructConstants.getOrCreate(Ty, V);
+Constant *ConstantStruct::get(const StructType *Ty,
+ const std::vector<Constant*> &V) {
+ // Create a ConstantAggregateZero value if all elements are zeros...
+ for (unsigned i = 0, e = V.size(); i != e; ++i)
+ if (!V[i]->isNullValue())
+ return StructConstants.getOrCreate(Ty, V);
+
+ return ConstantAggregateZero::get(Ty);
}
// destroyConstant - Remove the constant from the constant table...
//---- ConstantPointerNull::get() implementation...
//
-// ConstantPointerNull does not take extra "value" argument...
-template<class ValType>
-struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
- static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
- return new ConstantPointerNull(Ty);
- }
-};
+namespace llvm {
+ // ConstantPointerNull does not take extra "value" argument...
+ template<class ValType>
+ struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
+ static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
+ return new ConstantPointerNull(Ty);
+ }
+ };
-template<>
-struct ConvertConstantType<ConstantPointerNull, PointerType> {
- static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
- // Make everyone now use a constant of the new type...
- Constant *New = ConstantPointerNull::get(NewTy);
- assert(New != OldC && "Didn't replace constant??");
- OldC->uncheckedReplaceAllUsesWith(New);
- OldC->destroyConstant(); // This constant is now dead, destroy it.
- }
-};
+ template<>
+ struct ConvertConstantType<ConstantPointerNull, PointerType> {
+ static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ Constant *New = ConstantPointerNull::get(NewTy);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+ };
+}
static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
//
typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;
-template<>
-struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
- static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) {
- if (V.first == Instruction::Cast)
- return new ConstantExpr(Instruction::Cast, V.second[0], Ty);
- if ((V.first >= Instruction::BinaryOpsBegin &&
- V.first < Instruction::BinaryOpsEnd) ||
- V.first == Instruction::Shl || V.first == Instruction::Shr)
- return new ConstantExpr(V.first, V.second[0], V.second[1]);
-
- assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!");
-
- std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
- return new ConstantExpr(V.second[0], IdxList, Ty);
- }
-};
+namespace llvm {
+ template<>
+ struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
+ static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) {
+ if (V.first == Instruction::Cast)
+ return new ConstantExpr(Instruction::Cast, V.second[0], Ty);
+ if ((V.first >= Instruction::BinaryOpsBegin &&
+ V.first < Instruction::BinaryOpsEnd) ||
+ V.first == Instruction::Shl || V.first == Instruction::Shr)
+ return new ConstantExpr(V.first, V.second[0], V.second[1]);
+ if (V.first == Instruction::Select)
+ return new ConstantExpr(V.second[0], V.second[1], V.second[2]);
+
+ assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!");
+
+ std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
+ return new ConstantExpr(V.second[0], IdxList, Ty);
+ }
+ };
-template<>
-struct ConvertConstantType<ConstantExpr, Type> {
- static void convert(ConstantExpr *OldC, const Type *NewTy) {
- Constant *New;
- switch (OldC->getOpcode()) {
- case Instruction::Cast:
- New = ConstantExpr::getCast(OldC->getOperand(0), NewTy);
- break;
- case Instruction::Shl:
- case Instruction::Shr:
- New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
+ template<>
+ struct ConvertConstantType<ConstantExpr, Type> {
+ static void convert(ConstantExpr *OldC, const Type *NewTy) {
+ Constant *New;
+ switch (OldC->getOpcode()) {
+ case Instruction::Cast:
+ New = ConstantExpr::getCast(OldC->getOperand(0), NewTy);
+ break;
+ case Instruction::Select:
+ New = ConstantExpr::getSelectTy(NewTy, OldC->getOperand(0),
+ OldC->getOperand(1),
+ OldC->getOperand(2));
+ break;
+ case Instruction::Shl:
+ case Instruction::Shr:
+ New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
OldC->getOperand(0), OldC->getOperand(1));
- break;
- default:
- assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
- OldC->getOpcode() < Instruction::BinaryOpsEnd);
- New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
- OldC->getOperand(1));
- break;
- case Instruction::GetElementPtr:
- // Make everyone now use a constant of the new type...
- std::vector<Constant*> C;
- for (unsigned i = 1, e = OldC->getNumOperands(); i != e; ++i)
- C.push_back(cast<Constant>(OldC->getOperand(i)));
- New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), C);
- break;
+ break;
+ default:
+ assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
+ OldC->getOpcode() < Instruction::BinaryOpsEnd);
+ New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
+ OldC->getOperand(1));
+ break;
+ case Instruction::GetElementPtr:
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 1, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), C);
+ break;
+ }
+
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
}
-
- assert(New != OldC && "Didn't replace constant??");
- OldC->uncheckedReplaceAllUsesWith(New);
- OldC->destroyConstant(); // This constant is now dead, destroy it.
- }
-};
+ };
+} // end namespace llvm
static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants;
Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) {
+ assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
+
if (Constant *FC = ConstantFoldCastInstruction(C, Ty))
return FC; // Fold a few common cases...
return ExprConstants.getOrCreate(Ty, Key);
}
+Constant *ConstantExpr::getSignExtend(Constant *C, const Type *Ty) {
+ assert(C->getType()->isInteger() && Ty->isInteger() &&
+ C->getType()->getPrimitiveSize() <= Ty->getPrimitiveSize() &&
+ "This is an illegal sign extension!");
+ C = ConstantExpr::getCast(C, C->getType()->getSignedVersion());
+ return ConstantExpr::getCast(C, Ty);
+}
+
+Constant *ConstantExpr::getZeroExtend(Constant *C, const Type *Ty) {
+ assert(C->getType()->isInteger() && Ty->isInteger() &&
+ C->getType()->getPrimitiveSize() <= Ty->getPrimitiveSize() &&
+ "This is an illegal zero extension!");
+ C = ConstantExpr::getCast(C, C->getType()->getUnsignedVersion());
+ return ConstantExpr::getCast(C, Ty);
+}
+
Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
Constant *C1, Constant *C2) {
+ if (Opcode == Instruction::Shl || Opcode == Instruction::Shr)
+ return getShiftTy(ReqTy, Opcode, C1, C2);
// Check the operands for consistency first
assert((Opcode >= Instruction::BinaryOpsBegin &&
Opcode < Instruction::BinaryOpsEnd) &&
return ExprConstants.getOrCreate(ReqTy, Key);
}
-/// getShift - Return a shift left or shift right constant expr
+Constant *ConstantExpr::getSelectTy(const Type *ReqTy, Constant *C,
+ Constant *V1, Constant *V2) {
+ assert(C->getType() == Type::BoolTy && "Select condition must be bool!");
+ assert(V1->getType() == V2->getType() && "Select value types must match!");
+ assert(V1->getType()->isFirstClassType() && "Cannot select aggregate type!");
+
+ if (ReqTy == V1->getType())
+ if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
+ return SC; // Fold common cases
+
+ std::vector<Constant*> argVec(3, C);
+ argVec[1] = V1;
+ argVec[2] = V2;
+ ExprMapKeyType Key = std::make_pair(Instruction::Select, argVec);
+ return ExprConstants.getOrCreate(ReqTy, Key);
+}
+
+/// getShiftTy - Return a shift left or shift right constant expr
Constant *ConstantExpr::getShiftTy(const Type *ReqTy, unsigned Opcode,
Constant *C1, Constant *C2) {
// Check the operands for consistency first
assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy &&
"Invalid operand types for Shift constant expr!");
- if (Constant *FC = ConstantFoldShiftInstruction(Opcode, C1, C2))
+ if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
return FC; // Fold a few common cases...
// Look up the constant in the table first to ensure uniqueness
Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
const std::vector<Constant*> &IdxList) {
+ assert(GetElementPtrInst::getIndexedType(C->getType(),
+ std::vector<Value*>(IdxList.begin(), IdxList.end()), true) &&
+ "GEP indices invalid!");
+
if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
return FC; // Fold a few common cases...
+
assert(isa<PointerType>(C->getType()) &&
"Non-pointer type for constant GetElementPtr expression");
-
// Look up the constant in the table first to ensure uniqueness
std::vector<Constant*> argVec(1, C);
argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
const char *ConstantExpr::getOpcodeName() const {
return Instruction::getOpcodeName(getOpcode());
}
-
-unsigned Constant::mutateReferences(Value *OldV, Value *NewV) {
- // Uses of constant pointer refs are global values, not constants!
- if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(this)) {
- GlobalValue *NewGV = cast<GlobalValue>(NewV);
- GlobalValue *OldGV = CPR->getValue();
-
- assert(OldGV == OldV && "Cannot mutate old value if I'm not using it!");
- Operands[0] = NewGV;
- OldGV->getParent()->mutateConstantPointerRef(OldGV, NewGV);
- return 1;
- } else {
- Constant *NewC = cast<Constant>(NewV);
- unsigned NumReplaced = 0;
- for (unsigned i = 0, N = getNumOperands(); i != N; ++i)
- if (Operands[i] == OldV) {
- ++NumReplaced;
- Operands[i] = NewC;
- }
- return NumReplaced;
- }
-}
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