mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-28 22:43:29 +00:00
251 lines
8.9 KiB
C++
251 lines
8.9 KiB
C++
//===-- TargetData.cpp - Data size & alignment routines --------------------==//
|
|
//
|
|
// 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 defines target properties related to datatype size/offset/alignment
|
|
// information.
|
|
//
|
|
// 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/Module.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/Support/GetElementPtrTypeIterator.h"
|
|
using namespace llvm;
|
|
|
|
// Handle the Pass registration stuff necessary to use TargetData's.
|
|
namespace {
|
|
// Register the default SparcV9 implementation...
|
|
RegisterPass<TargetData> X("targetdata", "Target Data Layout");
|
|
}
|
|
|
|
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
|
|
uint64_t &Size, unsigned char &Alignment);
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Support for StructLayout
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
StructLayout::StructLayout(const StructType *ST, const TargetData &TD) {
|
|
StructAlignment = 0;
|
|
StructSize = 0;
|
|
|
|
// Loop over each of the elements, placing them in memory...
|
|
for (StructType::element_iterator TI = ST->element_begin(),
|
|
TE = ST->element_end(); TI != TE; ++TI) {
|
|
const Type *Ty = *TI;
|
|
unsigned char A;
|
|
unsigned TyAlign;
|
|
uint64_t TySize;
|
|
getTypeInfo(Ty, &TD, TySize, A);
|
|
TyAlign = A;
|
|
|
|
// Add padding if necessary 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
|
|
}
|
|
|
|
// Empty structures have alignment of 1 byte.
|
|
if (StructAlignment == 0) StructAlignment = 1;
|
|
|
|
// 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;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// TargetData Class Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
TargetData::TargetData(const std::string &TargetName,
|
|
bool isLittleEndian, unsigned char PtrSize,
|
|
unsigned char PtrAl, unsigned char DoubleAl,
|
|
unsigned char FloatAl, unsigned char LongAl,
|
|
unsigned char IntAl, unsigned char ShortAl,
|
|
unsigned char ByteAl) {
|
|
|
|
// If this assert triggers, a pass "required" TargetData information, but the
|
|
// top level tool did not provide one for it. We do not want to default
|
|
// construct, or else we might end up using a bad endianness or pointer size!
|
|
//
|
|
assert(!TargetName.empty() &&
|
|
"ERROR: Tool did not specify a target data to use!");
|
|
|
|
LittleEndian = isLittleEndian;
|
|
PointerSize = PtrSize;
|
|
PointerAlignment = PtrAl;
|
|
DoubleAlignment = DoubleAl;
|
|
assert(DoubleAlignment == PtrAl &&
|
|
"Double alignment and pointer alignment agree for now!");
|
|
FloatAlignment = FloatAl;
|
|
LongAlignment = LongAl;
|
|
IntAlignment = IntAl;
|
|
ShortAlignment = ShortAl;
|
|
ByteAlignment = ByteAl;
|
|
}
|
|
|
|
TargetData::TargetData(const std::string &ToolName, const Module *M) {
|
|
LittleEndian = M->getEndianness() != Module::BigEndian;
|
|
PointerSize = M->getPointerSize() != Module::Pointer64 ? 4 : 8;
|
|
PointerAlignment = PointerSize;
|
|
DoubleAlignment = PointerSize;
|
|
FloatAlignment = 4;
|
|
LongAlignment = 8;
|
|
IntAlignment = 4;
|
|
ShortAlignment = 2;
|
|
ByteAlignment = 1;
|
|
}
|
|
|
|
static std::map<std::pair<const TargetData*,const StructType*>,
|
|
StructLayout> *Layouts = 0;
|
|
|
|
|
|
TargetData::~TargetData() {
|
|
if (Layouts) {
|
|
// Remove any layouts for this TD.
|
|
std::map<std::pair<const TargetData*,
|
|
const StructType*>, StructLayout>::iterator
|
|
I = Layouts->lower_bound(std::make_pair(this, (const StructType*)0));
|
|
while (I != Layouts->end() && I->first.first == this)
|
|
Layouts->erase(I++);
|
|
if (Layouts->empty()) {
|
|
delete Layouts;
|
|
Layouts = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
|
|
if (Layouts == 0)
|
|
Layouts = new std::map<std::pair<const TargetData*,const StructType*>,
|
|
StructLayout>();
|
|
std::map<std::pair<const TargetData*,const StructType*>,
|
|
StructLayout>::iterator
|
|
I = Layouts->lower_bound(std::make_pair(this, Ty));
|
|
if (I != Layouts->end() && I->first.first == this && I->first.second == Ty)
|
|
return &I->second;
|
|
else {
|
|
return &Layouts->insert(I, std::make_pair(std::make_pair(this, Ty),
|
|
StructLayout(Ty, *this)))->second;
|
|
}
|
|
}
|
|
|
|
static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
|
|
uint64_t &Size, unsigned char &Alignment) {
|
|
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
|
|
switch (Ty->getTypeID()) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
uint64_t TargetData::getTypeSize(const Type *Ty) const {
|
|
uint64_t Size;
|
|
unsigned char Align;
|
|
getTypeInfo(Ty, this, Size, Align);
|
|
return Size;
|
|
}
|
|
|
|
unsigned char TargetData::getTypeAlignment(const Type *Ty) const {
|
|
uint64_t Size;
|
|
unsigned char Align;
|
|
getTypeInfo(Ty, this, Size, Align);
|
|
return Align;
|
|
}
|
|
|
|
/// getIntPtrType - Return an unsigned integer type that is the same size or
|
|
/// greater to the host pointer size.
|
|
const Type *TargetData::getIntPtrType() const {
|
|
switch (getPointerSize()) {
|
|
default: assert(0 && "Unknown pointer size!");
|
|
case 2: return Type::UShortTy;
|
|
case 4: return Type::UIntTy;
|
|
case 8: return Type::ULongTy;
|
|
}
|
|
}
|
|
|
|
|
|
uint64_t TargetData::getIndexedOffset(const Type *ptrTy,
|
|
const std::vector<Value*> &Idx) const {
|
|
const Type *Ty = ptrTy;
|
|
assert(isa<PointerType>(Ty) && "Illegal argument for getIndexedOffset()");
|
|
uint64_t Result = 0;
|
|
|
|
generic_gep_type_iterator<std::vector<Value*>::const_iterator>
|
|
TI = gep_type_begin(ptrTy, Idx.begin(), Idx.end());
|
|
for (unsigned CurIDX = 0; CurIDX != Idx.size(); ++CurIDX, ++TI) {
|
|
if (const StructType *STy = dyn_cast<StructType>(*TI)) {
|
|
assert(Idx[CurIDX]->getType() == Type::UIntTy && "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->getElementType(FieldNo);
|
|
} else {
|
|
// Update Ty to refer to current element
|
|
Ty = cast<SequentialType>(Ty)->getElementType();
|
|
|
|
// Get the array index and the size of each array element.
|
|
int64_t arrayIdx = cast<ConstantInt>(Idx[CurIDX])->getRawValue();
|
|
Result += arrayIdx * (int64_t)getTypeSize(Ty);
|
|
}
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|