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// $Id$
//***************************************************************************
// File:
// TargetMachine.cpp
//
// Purpose:
//
// History:
// 7/12/01 - Vikram Adve - Created
//**************************************************************************/
//************************** System Include Files **************************/
//*************************** User Include Files ***************************/
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/TargetMachine.h"
//************************* Opaque Declarations ****************************/
class StructType;
class MachineInstrInfo;
//************************ Class Implementations **************************/
//---------------------------------------------------------------------------
// function TargetMachine::findOptimalMemberOffsets
//
// Purpose:
// Compute optimal offsets for the members of a structure.
// Returns a vector of unsigned ints, one per member.
// Caller is responsible for freeing the vector.
//---------------------------------------------------------------------------
unsigned int
TargetMachine::findOptimalStorageSize(const Type* ty) const
{
switch(ty->getPrimitiveID())
{
case Type::BoolTyID:
case Type::UByteTyID: case Type::SByteTyID:
case Type::UShortTyID: case Type::ShortTyID:
return optSizeForSubWordData;
break;
case Type::UIntTyID: case Type::IntTyID:
return intSize;
break;
case Type::FloatTyID:
return floatSize;
break;
case Type::ULongTyID: case Type::LongTyID:
return longSize;
break;
case Type::DoubleTyID:
return doubleSize;
break;
case Type::PointerTyID:
case Type::LabelTyID: case Type::MethodTyID:
return pointerSize;
break;
case Type::ArrayTyID:
{
ArrayType* aty = (ArrayType*) ty;
assert(aty->getNumElements() >= 0 &&
"Attempting to compute size for unknown-size array");
return (unsigned) aty->getNumElements() *
this->findOptimalStorageSize(aty->getElementType());
break;
}
case Type::StructTyID:
{// This code should be invoked only from StructType::getStorageSize().
StructType* sty = (StructType*) ty;
unsigned lastMemberIdx = sty->getElementTypes().size() - 1;
unsigned lastMemberOffset = sty->getElementOffset(lastMemberIdx, *this);
unsigned storageSize = lastMemberOffset
+ this->findOptimalStorageSize(sty->getElementTypes()[lastMemberIdx]);
return storageSize;
break;
}
default:
assert(0 && "Unexpected type in `findOptimalStorageSize'");
return 0;
break;
}
}
unsigned int*
TargetMachine::findOptimalMemberOffsets(const StructType* stype) const
{
int numMembers = stype->getElementTypes().size();
unsigned int* offsetVec = new unsigned int[numMembers];
unsigned int netOffset = 0;
for (int i = 0; i < numMembers; i++)
{
offsetVec[i] = netOffset;
const Type* memberType = stype->getElementTypes()[i];
netOffset += this->findOptimalStorageSize(memberType);
}
return offsetVec;
}
//---------------------------------------------------------------------------
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