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40bbeb5d07
llvm/lib/VMCore/Constants.cpp
Chris Lattner 40bbeb5d07 Add a new ConstantAggregateZero class, to fix PR239. This makes zero 
initializers for constant structs and arrays take constant space, instead of
space proportinal to the number of elements.  This reduces the memory usage of
the LLVM compiler by hundreds of megabytes when compiling some nasty SPEC95
benchmarks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11470 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-15 05:53:04 +00:00

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//===-- 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 "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);
//===----------------------------------------------------------------------===//
// Constant Class
//===----------------------------------------------------------------------===//
// Specialize setName to take care of symbol table majik
void Constant::setName(const std::string &Name, SymbolTable *ST) {
assert(ST && "Type::setName - Must provide symbol table argument!");
if (Name.size()) ST->insert(Name, this);
}
void Constant::destroyConstantImpl() {
// When a Constant is destroyed, there may be lingering
// references to the constant by other constants in the constant pool. These
// constants are implicitly dependent on the module that is being deleted,
// but they don't know that. Because we only find out when the CPV is
// deleted, we must now notify all of our users (that should only be
// Constants) that they are, in fact, invalid now and should be deleted.
//
while (!use_empty()) {
Value *V = use_back();
#ifndef NDEBUG // Only in -g mode...
if (!isa<Constant>(V))
std::cerr << "While deleting: " << *this
<< "\n\nUse still stuck around after Def is destroyed: "
<< *V << "\n\n";
#endif
assert(isa<Constant>(V) && "References remain to Constant being destroyed");
Constant *CPV = cast<Constant>(V);
CPV->destroyConstant();
// The constant should remove itself from our use list...
assert((use_empty() || use_back() != V) && "Constant not removed!");
}
// Value has no outstanding references it is safe to delete it now...
delete this;
}
// Static constructor to create a '0' constant of arbitrary type...
Constant *Constant::getNullValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: {
static Constant *NullBool = ConstantBool::get(false);
return NullBool;
}
case Type::SByteTyID: {
static Constant *NullSByte = ConstantSInt::get(Type::SByteTy, 0);
return NullSByte;
}
case Type::UByteTyID: {
static Constant *NullUByte = ConstantUInt::get(Type::UByteTy, 0);
return NullUByte;
}
case Type::ShortTyID: {
static Constant *NullShort = ConstantSInt::get(Type::ShortTy, 0);
return NullShort;
}
case Type::UShortTyID: {
static Constant *NullUShort = ConstantUInt::get(Type::UShortTy, 0);
return NullUShort;
}
case Type::IntTyID: {
static Constant *NullInt = ConstantSInt::get(Type::IntTy, 0);
return NullInt;
}
case Type::UIntTyID: {
static Constant *NullUInt = ConstantUInt::get(Type::UIntTy, 0);
return NullUInt;
}
case Type::LongTyID: {
static Constant *NullLong = ConstantSInt::get(Type::LongTy, 0);
return NullLong;
}
case Type::ULongTyID: {
static Constant *NullULong = ConstantUInt::get(Type::ULongTy, 0);
return NullULong;
}
case Type::FloatTyID: {
static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
return NullFloat;
}
case Type::DoubleTyID: {
static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
return NullDouble;
}
case Type::PointerTyID:
return ConstantPointerNull::get(cast<PointerType>(Ty));
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!");
return 0;
}
}
// Static constructor to create the maximum constant of an integral type...
ConstantIntegral *ConstantIntegral::getMaxValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return ConstantBool::True;
case Type::SByteTyID:
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID: {
// Calculate 011111111111111...
unsigned TypeBits = Ty->getPrimitiveSize()*8;
int64_t Val = INT64_MAX; // All ones
Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
return ConstantSInt::get(Ty, Val);
}
case Type::UByteTyID:
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID: return getAllOnesValue(Ty);
default: return 0;
}
}
// Static constructor to create the minimum constant for an integral type...
ConstantIntegral *ConstantIntegral::getMinValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return ConstantBool::False;
case Type::SByteTyID:
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID: {
// Calculate 1111111111000000000000
unsigned TypeBits = Ty->getPrimitiveSize()*8;
int64_t Val = -1; // All ones
Val <<= TypeBits-1; // Shift over to the right spot
return ConstantSInt::get(Ty, Val);
}
case Type::UByteTyID:
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
default: return 0;
}
}
// Static constructor to create an integral constant with all bits set
ConstantIntegral *ConstantIntegral::getAllOnesValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return ConstantBool::True;
case Type::SByteTyID:
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID: return ConstantSInt::get(Ty, -1);
case Type::UByteTyID:
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID: {
// Calculate ~0 of the right type...
unsigned TypeBits = Ty->getPrimitiveSize()*8;
uint64_t Val = ~0ULL; // All ones
Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
return ConstantUInt::get(Ty, Val);
}
default: return 0;
}
}
bool ConstantUInt::isAllOnesValue() const {
unsigned TypeBits = getType()->getPrimitiveSize()*8;
uint64_t Val = ~0ULL; // All ones
Val >>= 64-TypeBits; // Shift out inappropriate bits
return getValue() == Val;
}
//===----------------------------------------------------------------------===//
// ConstantXXX Classes
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Normal Constructors
ConstantBool::ConstantBool(bool V) : ConstantIntegral(Type::BoolTy) {
Val = V;
}
ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : ConstantIntegral(Ty) {
Val.Unsigned = V;
}
ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
assert(Ty->isInteger() && Ty->isSigned() &&
"Illegal type for unsigned integer constant!");
assert(isValueValidForType(Ty, V) && "Value too large for type!");
}
ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, V) {
assert(Ty->isInteger() && Ty->isUnsigned() &&
"Illegal type for unsigned integer constant!");
assert(isValueValidForType(Ty, V) && "Value too large for type!");
}
ConstantFP::ConstantFP(const Type *Ty, double V) : Constant(Ty) {
assert(isValueValidForType(Ty, V) && "Value too large for type!");
Val = V;
}
ConstantArray::ConstantArray(const ArrayType *T,
const std::vector<Constant*> &V) : Constant(T) {
Operands.reserve(V.size());
for (unsigned i = 0, e = V.size(); i != e; ++i) {
assert(V[i]->getType() == T->getElementType() ||
(T->isAbstract() &&
V[i]->getType()->getPrimitiveID() ==
T->getElementType()->getPrimitiveID()));
Operands.push_back(Use(V[i], this));
}
}
ConstantStruct::ConstantStruct(const StructType *T,
const std::vector<Constant*> &V) : Constant(T) {
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() == 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)
: Constant(GV->getType()) {
Operands.push_back(Use(GV, this));
}
ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
: Constant(Ty), iType(Opcode) {
Operands.push_back(Use(C, this));
}
static bool isSetCC(unsigned Opcode) {
return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE ||
Opcode == Instruction::SetLT || Opcode == Instruction::SetGT ||
Opcode == Instruction::SetLE || Opcode == Instruction::SetGE;
}
ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
: Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) {
Operands.push_back(Use(C1, this));
Operands.push_back(Use(C2, this));
}
ConstantExpr::ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
const Type *DestTy)
: Constant(DestTy), iType(Instruction::GetElementPtr) {
Operands.reserve(1+IdxList.size());
Operands.push_back(Use(C, this));
for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
Operands.push_back(Use(IdxList[i], this));
}
//===----------------------------------------------------------------------===//
// classof implementations
bool ConstantIntegral::classof(const Constant *CPV) {
return CPV->getType()->isIntegral() && !isa<ConstantExpr>(CPV);
}
bool ConstantInt::classof(const Constant *CPV) {
return CPV->getType()->isInteger() && !isa<ConstantExpr>(CPV);
}
bool ConstantSInt::classof(const Constant *CPV) {
return CPV->getType()->isSigned() && !isa<ConstantExpr>(CPV);
}
bool ConstantUInt::classof(const Constant *CPV) {
return CPV->getType()->isUnsigned() && !isa<ConstantExpr>(CPV);
}
bool ConstantFP::classof(const Constant *CPV) {
const Type *Ty = CPV->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()) && !CPV->isNullValue();
}
bool ConstantStruct::classof(const Constant *CPV) {
return isa<StructType>(CPV->getType()) && !CPV->isNullValue();
}
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;
}
//===----------------------------------------------------------------------===//
// isValueValidForType implementations
bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) {
switch (Ty->getPrimitiveID()) {
default:
return false; // These can't be represented as integers!!!
// Signed types...
case Type::SByteTyID:
return (Val <= INT8_MAX && Val >= INT8_MIN);
case Type::ShortTyID:
return (Val <= INT16_MAX && Val >= INT16_MIN);
case Type::IntTyID:
return (Val <= INT32_MAX && Val >= INT32_MIN);
case Type::LongTyID:
return true; // This is the largest type...
}
assert(0 && "WTF?");
return false;
}
bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) {
switch (Ty->getPrimitiveID()) {
default:
return false; // These can't be represented as integers!!!
// Unsigned types...
case Type::UByteTyID:
return (Val <= UINT8_MAX);
case Type::UShortTyID:
return (Val <= UINT16_MAX);
case Type::UIntTyID:
return (Val <= UINT32_MAX);
case Type::ULongTyID:
return true; // This is the largest type...
}
assert(0 && "WTF?");
return false;
}
bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
switch (Ty->getPrimitiveID()) {
default:
return false; // These can't be represented as floating point!
// TODO: Figure out how to test if a double can be cast to a float!
case Type::FloatTyID:
case Type::DoubleTyID:
return true; // This is the largest type...
}
};
//===----------------------------------------------------------------------===//
// replaceUsesOfWithOnConstant implementations
void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
std::vector<Constant*> Values;
Values.reserve(getValues().size()); // Build replacement array...
for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
Constant *Val = cast<Constant>(getValues()[i]);
if (Val == From) Val = cast<Constant>(To);
Values.push_back(Val);
}
Constant *Replacement = ConstantArray::get(getType(), Values);
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...
if (DisableChecking)
uncheckedReplaceAllUsesWith(Replacement);
else
replaceAllUsesWith(Replacement);
// Delete the old constant!
destroyConstant();
}
void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
std::vector<Constant*> Values;
Values.reserve(getValues().size());
for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
Constant *Val = cast<Constant>(getValues()[i]);
if (Val == From) Val = cast<Constant>(To);
Values.push_back(Val);
}
Constant *Replacement = ConstantStruct::get(getType(), Values);
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...
if (DisableChecking)
uncheckedReplaceAllUsesWith(Replacement);
else
replaceAllUsesWith(Replacement);
// Delete the old constant!
destroyConstant();
}
void ConstantPointerRef::replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking) {
if (isa<GlobalValue>(To)) {
assert(From == getOperand(0) && "Doesn't contain from!");
ConstantPointerRef *Replacement =
ConstantPointerRef::get(cast<GlobalValue>(To));
// Everyone using this now uses the replacement...
if (DisableChecking)
uncheckedReplaceAllUsesWith(Replacement);
else
replaceAllUsesWith(Replacement);
} else {
// Just replace ourselves with the To value specified.
if (DisableChecking)
uncheckedReplaceAllUsesWith(To);
else
replaceAllUsesWith(To);
}
// Delete the old constant!
destroyConstant();
}
void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
bool DisableChecking) {
assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
Constant *To = cast<Constant>(ToV);
Constant *Replacement = 0;
if (getOpcode() == Instruction::GetElementPtr) {
std::vector<Constant*> Indices;
Constant *Pointer = getOperand(0);
Indices.reserve(getNumOperands()-1);
if (Pointer == From) Pointer = To;
for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
Constant *Val = getOperand(i);
if (Val == From) Val = To;
Indices.push_back(Val);
}
Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices);
} else if (getOpcode() == Instruction::Cast) {
assert(getOperand(0) == From && "Cast only has one use!");
Replacement = ConstantExpr::getCast(To, getType());
} else if (getNumOperands() == 2) {
Constant *C1 = getOperand(0);
Constant *C2 = getOperand(1);
if (C1 == From) C1 = To;
if (C2 == From) C2 = To;
Replacement = ConstantExpr::get(getOpcode(), C1, C2);
} else {
assert(0 && "Unknown ConstantExpr type!");
return;
}
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...
if (DisableChecking)
uncheckedReplaceAllUsesWith(Replacement);
else
replaceAllUsesWith(Replacement);
// Delete the old constant!
destroyConstant();
}
//===----------------------------------------------------------------------===//
// Factory Function Implementation
// ConstantCreator - A class that is used to create constants by
// ValueMap*. This class should be partially specialized if there is
// something strange that needs to be done to interface to the ctor for the
// constant.
//
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>
class ValueMap : public AbstractTypeUser {
typedef std::pair<const TypeClass*, ValType> MapKey;
typedef std::map<MapKey, ConstantClass *> MapTy;
typedef typename MapTy::iterator MapIterator;
MapTy Map;
typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
AbstractTypeMapTy AbstractTypeMap;
public:
// getOrCreate - Return the specified constant from the map, creating it if
// necessary.
ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
MapKey Lookup(Ty, V);
MapIterator I = Map.lower_bound(Lookup);
if (I != Map.end() && I->first == Lookup)
return I->second; // Is it in the map?
// If no preexisting value, create one now...
ConstantClass *Result =
ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V);
/// FIXME: why does this assert fail when loading 176.gcc?
//assert(Result->getType() == Ty && "Type specified is not correct!");
I = Map.insert(I, std::make_pair(MapKey(Ty, V), Result));
// If the type of the constant is abstract, make sure that an entry exists
// for it in the AbstractTypeMap.
if (Ty->isAbstract()) {
typename AbstractTypeMapTy::iterator TI =
AbstractTypeMap.lower_bound(Ty);
if (TI == AbstractTypeMap.end() || TI->first != Ty) {
// Add ourselves to the ATU list of the type.
cast<DerivedType>(Ty)->addAbstractTypeUser(this);
AbstractTypeMap.insert(TI, std::make_pair(Ty, I));
}
}
return Result;
}
void remove(ConstantClass *CP) {
// FIXME: This should not use a linear scan. If this gets to be a
// performance problem, someone should look at this.
MapIterator I = Map.begin();
for (MapIterator E = Map.end(); I != E && I->second != CP; ++I)
/* empty */;
assert(I != Map.end() && "Constant not found in constant table!");
// Now that we found the entry, make sure this isn't the entry that
// the AbstractTypeMap points to.
const TypeClass *Ty = I->first.first;
if (Ty->isAbstract()) {
assert(AbstractTypeMap.count(Ty) &&
"Abstract type not in AbstractTypeMap?");
MapIterator &ATMEntryIt = AbstractTypeMap[Ty];
if (ATMEntryIt == I) {
// Yes, we are removing the representative entry for this type.
// See if there are any other entries of the same type.
MapIterator TmpIt = ATMEntryIt;
// First check the entry before this one...
if (TmpIt != Map.begin()) {
--TmpIt;
if (TmpIt->first.first != Ty) // Not the same type, move back...
++TmpIt;
}
// If we didn't find the same type, try to move forward...
if (TmpIt == ATMEntryIt) {
++TmpIt;
if (TmpIt == Map.end() || TmpIt->first.first != Ty)
--TmpIt; // No entry afterwards with the same type
}
// If there is another entry in the map of the same abstract type,
// update the AbstractTypeMap entry now.
if (TmpIt != ATMEntryIt) {
ATMEntryIt = TmpIt;
} else {
// Otherwise, we are removing the last instance of this type
// from the table. Remove from the ATM, and from user list.
cast<DerivedType>(Ty)->removeAbstractTypeUser(this);
AbstractTypeMap.erase(Ty);
}
}
}
Map.erase(I);
}
void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
typename AbstractTypeMapTy::iterator I =
AbstractTypeMap.find(cast<TypeClass>(OldTy));
assert(I != AbstractTypeMap.end() &&
"Abstract type not in AbstractTypeMap?");
// Convert a constant at a time until the last one is gone. The last one
// leaving will remove() itself, causing the AbstractTypeMapEntry to be
// eliminated eventually.
do {
ConvertConstantType<ConstantClass,
TypeClass>::convert(I->second->second,
cast<TypeClass>(NewTy));
I = AbstractTypeMap.find(cast<TypeClass>(OldTy));
} while (I != AbstractTypeMap.end());
}
// If the type became concrete without being refined to any other existing
// type, we just remove ourselves from the ATU list.
void typeBecameConcrete(const DerivedType *AbsTy) {
AbsTy->removeAbstractTypeUser(this);
}
void dump() const {
std::cerr << "Constant.cpp: ValueMap\n";
}
};
}
//---- ConstantUInt::get() and ConstantSInt::get() implementations...
//
static ValueMap< int64_t, Type, ConstantSInt> SIntConstants;
static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants;
ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
return SIntConstants.getOrCreate(Ty, V);
}
ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
return UIntConstants.getOrCreate(Ty, V);
}
ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
assert(V <= 127 && "Can only be used with very small positive constants!");
if (Ty->isSigned()) return ConstantSInt::get(Ty, V);
return ConstantUInt::get(Ty, V);
}
//---- ConstantFP::get() implementation...
//
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) {
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);
}
}
//---- 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<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;
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...
//
void ConstantArray::destroyConstant() {
ArrayConstants.remove(this);
destroyConstantImpl();
}
// ConstantArray::get(const string&) - Return an array that is initialized to
// contain the specified string. A null terminator is added to the specified
// string so that it may be used in a natural way...
//
Constant *ConstantArray::get(const std::string &Str) {
std::vector<Constant*> ElementVals;
for (unsigned i = 0; i < Str.length(); ++i)
ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i]));
// Add a null terminator to the string...
ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0));
ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1);
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(isString() && "Not a string!");
std::string Result;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue();
return Result;
}
//---- ConstantStruct::get() implementation...
//
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;
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...
//
void ConstantStruct::destroyConstant() {
StructConstants.remove(this);
destroyConstantImpl();
}
//---- ConstantPointerNull::get() implementation...
//
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.
}
};
}
static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
return NullPtrConstants.getOrCreate(Ty, 0);
}
// destroyConstant - Remove the constant from the constant table...
//
void ConstantPointerNull::destroyConstant() {
NullPtrConstants.remove(this);
destroyConstantImpl();
}
//---- ConstantPointerRef::get() implementation...
//
ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) {
assert(GV->getParent() && "Global Value must be attached to a module!");
// The Module handles the pointer reference sharing...
return GV->getParent()->getConstantPointerRef(GV);
}
// destroyConstant - Remove the constant from the constant table...
//
void ConstantPointerRef::destroyConstant() {
getValue()->getParent()->destroyConstantPointerRef(this);
destroyConstantImpl();
}
//---- ConstantExpr::get() implementations...
//
typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;
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]);
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(),
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;
}
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...
// Look up the constant in the table first to ensure uniqueness
std::vector<Constant*> argVec(1, C);
ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec);
return ExprConstants.getOrCreate(Ty, Key);
}
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) &&
"Invalid opcode in binary constant expression");
assert(C1->getType() == C2->getType() &&
"Operand types in binary constant expression should match");
if (ReqTy == C1->getType())
if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
return FC; // Fold a few common cases...
std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
ExprMapKeyType Key = std::make_pair(Opcode, 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((Opcode == Instruction::Shl ||
Opcode == Instruction::Shr) &&
"Invalid opcode in binary constant expression");
assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy &&
"Invalid operand types for Shift constant expr!");
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
std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
ExprMapKeyType Key = std::make_pair(Opcode, argVec);
return ExprConstants.getOrCreate(ReqTy, Key);
}
Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
const std::vector<Constant*> &IdxList) {
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 ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,argVec);
return ExprConstants.getOrCreate(ReqTy, Key);
}
Constant *ConstantExpr::getGetElementPtr(Constant *C,
const std::vector<Constant*> &IdxList){
// Get the result type of the getelementptr!
std::vector<Value*> VIdxList(IdxList.begin(), IdxList.end());
const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), VIdxList,
true);
assert(Ty && "GEP indices invalid!");
if (C->isNullValue()) {
bool isNull = true;
for (unsigned i = 0, e = IdxList.size(); i != e; ++i)
if (!IdxList[i]->isNullValue()) {
isNull = false;
break;
}
if (isNull) return ConstantPointerNull::get(PointerType::get(Ty));
}
return getGetElementPtrTy(PointerType::get(Ty), C, IdxList);
}
// destroyConstant - Remove the constant from the constant table...
//
void ConstantExpr::destroyConstant() {
ExprConstants.remove(this);
destroyConstantImpl();
}
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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