mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1515 91177308-0d34-0410-b5e6-96231b3b80d8
181 lines
6.6 KiB
C++
181 lines
6.6 KiB
C++
//===-- TargetData.cpp - Data size & alignment routines --------------------==//
|
|
//
|
|
// This file defines target properties related to datatype size/offset/alignment
|
|
// information. It uses lazy annotations to cache information about how
|
|
// structure types are laid out and used.
|
|
//
|
|
// This structure should be created once, filled in if the defaults are not
|
|
// correct and then passed around by const&. None of the members functions
|
|
// require modification to the object.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/ConstantVals.h"
|
|
|
|
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
|
|
unsigned &Size, unsigned char &Alignment);
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Support for StructLayout Annotation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
StructLayout::StructLayout(const StructType *ST, const TargetData &TD)
|
|
: Annotation(TD.getStructLayoutAID()) {
|
|
StructAlignment = 0;
|
|
StructSize = 0;
|
|
|
|
// Loop over each of the elements, placing them in memory...
|
|
for (StructType::ElementTypes::const_iterator
|
|
TI = ST->getElementTypes().begin(),
|
|
TE = ST->getElementTypes().end(); TI != TE; ++TI) {
|
|
const Type *Ty = *TI;
|
|
unsigned char A;
|
|
unsigned TySize, TyAlign;
|
|
getTypeInfo(Ty, &TD, TySize, A); TyAlign = A;
|
|
|
|
// Add padding if neccesary to make the data element aligned properly...
|
|
if (StructSize % TyAlign != 0)
|
|
StructSize = (StructSize/TyAlign + 1) * TyAlign; // Add padding...
|
|
|
|
// Keep track of maximum alignment constraint
|
|
StructAlignment = std::max(TyAlign, StructAlignment);
|
|
|
|
MemberOffsets.push_back(StructSize);
|
|
StructSize += TySize; // Consume space for this data item...
|
|
}
|
|
|
|
// Add padding to the end of the struct so that it could be put in an array
|
|
// and all array elements would be aligned correctly.
|
|
if (StructSize % StructAlignment != 0)
|
|
StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
|
|
|
|
if (StructSize == 0) {
|
|
StructSize = 1; // Empty struct is 1 byte
|
|
StructAlignment = 1;
|
|
}
|
|
}
|
|
|
|
Annotation *TargetData::TypeAnFactory(AnnotationID AID, const Annotable *T,
|
|
void *D) {
|
|
const TargetData &TD = *(const TargetData*)D;
|
|
assert(AID == TD.AID && "Target data annotation ID mismatch!");
|
|
const Type *Ty = cast<const Type>((const Value *)T);
|
|
assert(Ty->isStructType() &&
|
|
"Can only create StructLayout annotation on structs!");
|
|
return new StructLayout((const StructType *)Ty, TD);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// TargetData Class Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
TargetData::TargetData(const std::string &TargetName, unsigned char PtrSize = 8,
|
|
unsigned char PtrAl = 8, unsigned char DoubleAl = 8,
|
|
unsigned char FloatAl = 4, unsigned char LongAl = 8,
|
|
unsigned char IntAl = 4, unsigned char ShortAl = 2,
|
|
unsigned char ByteAl = 1)
|
|
: AID(AnnotationManager::getID("TargetData::" + TargetName)) {
|
|
AnnotationManager::registerAnnotationFactory(AID, TypeAnFactory, this);
|
|
|
|
PointerSize = PtrSize;
|
|
PointerAlignment = PtrAl;
|
|
DoubleAlignment = DoubleAl;
|
|
FloatAlignment = FloatAl;
|
|
LongAlignment = LongAl;
|
|
IntAlignment = IntAl;
|
|
ShortAlignment = ShortAl;
|
|
ByteAlignment = ByteAl;
|
|
}
|
|
|
|
TargetData::~TargetData() {
|
|
AnnotationManager::registerAnnotationFactory(AID, 0); // Deregister factory
|
|
}
|
|
|
|
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
|
|
unsigned &Size, unsigned char &Alignment) {
|
|
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
|
|
switch (Ty->getPrimitiveID()) {
|
|
case Type::VoidTyID:
|
|
case Type::BoolTyID:
|
|
case Type::UByteTyID:
|
|
case Type::SByteTyID: Size = 1; Alignment = TD->getByteAlignment(); return;
|
|
case Type::UShortTyID:
|
|
case Type::ShortTyID: Size = 2; Alignment = TD->getShortAlignment(); return;
|
|
case Type::UIntTyID:
|
|
case Type::IntTyID: Size = 4; Alignment = TD->getIntAlignment(); return;
|
|
case Type::ULongTyID:
|
|
case Type::LongTyID: Size = 8; Alignment = TD->getLongAlignment(); return;
|
|
case Type::FloatTyID: Size = 4; Alignment = TD->getFloatAlignment(); return;
|
|
case Type::DoubleTyID: Size = 8; Alignment = TD->getDoubleAlignment(); return;
|
|
case Type::LabelTyID:
|
|
case Type::PointerTyID:
|
|
Size = TD->getPointerSize(); Alignment = TD->getPointerAlignment();
|
|
return;
|
|
case Type::ArrayTyID: {
|
|
const ArrayType *ATy = (const ArrayType *)Ty;
|
|
getTypeInfo(ATy->getElementType(), TD, Size, Alignment);
|
|
Size *= ATy->getNumElements();
|
|
return;
|
|
}
|
|
case Type::StructTyID: {
|
|
// Get the layout annotation... which is lazily created on demand.
|
|
const StructLayout *Layout = TD->getStructLayout((const StructType*)Ty);
|
|
Size = Layout->StructSize; Alignment = Layout->StructAlignment;
|
|
return;
|
|
}
|
|
|
|
case Type::TypeTyID:
|
|
default:
|
|
assert(0 && "Bad type for getTypeInfo!!!");
|
|
return;
|
|
}
|
|
}
|
|
|
|
unsigned TargetData::getTypeSize(const Type *Ty) const {
|
|
unsigned Size; unsigned char Align;
|
|
getTypeInfo(Ty, this, Size, Align);
|
|
return Size;
|
|
}
|
|
|
|
unsigned char TargetData::getTypeAlignment(const Type *Ty) const {
|
|
unsigned Size; unsigned char Align;
|
|
getTypeInfo(Ty, this, Size, Align);
|
|
return Align;
|
|
}
|
|
|
|
unsigned TargetData::getIndexedOffset(const Type *ptrTy,
|
|
const std::vector<Value*> &Idx) const {
|
|
const PointerType *PtrTy = cast<const PointerType>(ptrTy);
|
|
unsigned Result = 0;
|
|
|
|
// Get the type pointed to...
|
|
const Type *Ty = PtrTy->getElementType();
|
|
|
|
for (unsigned CurIDX = 0; CurIDX < Idx.size(); ++CurIDX) {
|
|
if (const StructType *STy = dyn_cast<const StructType>(Ty)) {
|
|
assert(Idx[CurIDX]->getType() == Type::UByteTy && "Illegal struct idx");
|
|
unsigned FieldNo = cast<ConstantUInt>(Idx[CurIDX])->getValue();
|
|
|
|
// Get structure layout information...
|
|
const StructLayout *Layout = getStructLayout(STy);
|
|
|
|
// Add in the offset, as calculated by the structure layout info...
|
|
assert(FieldNo < Layout->MemberOffsets.size() && "FieldNo out of range!");
|
|
Result += Layout->MemberOffsets[FieldNo];
|
|
|
|
// Update Ty to refer to current element
|
|
Ty = STy->getElementTypes()[FieldNo];
|
|
|
|
} else if (isa<const ArrayType>(Ty)) {
|
|
assert(0 && "Loading from arrays not implemented yet!");
|
|
} else {
|
|
assert(0 && "Indexing type that is not struct or array?");
|
|
return 0; // Load directly through ptr
|
|
}
|
|
}
|
|
|
|
return Result;
|
|
}
|