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//===-- llvm/Target/TargetData.h - Data size & alignment info ---*- C++ -*-===//
//
// 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. 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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETDATA_H
#define LLVM_TARGET_TARGETDATA_H
#include "llvm/Pass.h"
#include "llvm/Support/DataTypes.h"
#include <vector>
#include <string>
namespace llvm {
class Value;
class Type;
class StructType;
class StructLayout;
class TargetData : public ImmutablePass {
bool LittleEndian; // Defaults to false
unsigned char BoolAlignment; // Defaults to 1 byte
unsigned char ByteAlignment; // Defaults to 1 byte
unsigned char ShortAlignment; // Defaults to 2 bytes
unsigned char IntAlignment; // Defaults to 4 bytes
unsigned char LongAlignment; // Defaults to 8 bytes
unsigned char FloatAlignment; // Defaults to 4 bytes
unsigned char DoubleAlignment; // Defaults to 8 bytes
unsigned char PointerSize; // Defaults to 8 bytes
unsigned char PointerAlignment; // Defaults to 8 bytes
public:
TargetData(const std::string &TargetName = "",
bool LittleEndian = false,
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, unsigned char BoolAl = 1);
// Copy constructor
TargetData (const TargetData &TD) :
ImmutablePass(),
LittleEndian(TD.isLittleEndian()),
BoolAlignment(TD.getBoolAlignment()),
ByteAlignment(TD.getByteAlignment()),
ShortAlignment(TD.getShortAlignment()),
IntAlignment(TD.getIntAlignment()),
LongAlignment(TD.getLongAlignment()),
FloatAlignment(TD.getFloatAlignment()),
DoubleAlignment(TD.getDoubleAlignment()),
PointerSize(TD.getPointerSize()),
PointerAlignment(TD.getPointerAlignment()) {
}
TargetData(const std::string &ToolName, const Module *M);
~TargetData(); // Not virtual, do not subclass this class
/// Target endianness...
bool isLittleEndian() const { return LittleEndian; }
bool isBigEndian() const { return !LittleEndian; }
/// Target alignment constraints
unsigned char getBoolAlignment() const { return BoolAlignment; }
unsigned char getByteAlignment() const { return ByteAlignment; }
unsigned char getShortAlignment() const { return ShortAlignment; }
unsigned char getIntAlignment() const { return IntAlignment; }
unsigned char getLongAlignment() const { return LongAlignment; }
unsigned char getFloatAlignment() const { return FloatAlignment; }
unsigned char getDoubleAlignment() const { return DoubleAlignment; }
unsigned char getPointerAlignment() const { return PointerAlignment; }
unsigned char getPointerSize() const { return PointerSize; }
/// getTypeSize - Return the number of bytes necessary to hold the specified
/// type.
uint64_t getTypeSize(const Type *Ty) const;
/// getTypeAlignment - Return the minimum required alignment for the specified
/// type.
unsigned char getTypeAlignment(const Type *Ty) const;
/// getTypeAlignmentShift - Return the minimum required alignment for the
/// specified type, returned as log2 of the value (a shift amount).
unsigned char getTypeAlignmentShift(const Type *Ty) const;
/// getIntPtrType - Return an unsigned integer type that is the same size or
/// greater to the host pointer size.
const Type *getIntPtrType() const;
/// getIndexOffset - return the offset from the beginning of the type for the
/// specified indices. This is used to implement getelementptr.
///
uint64_t getIndexedOffset(const Type *Ty,
const std::vector<Value*> &Indices) const;
const StructLayout *getStructLayout(const StructType *Ty) const;
};
// This object is used to lazily calculate structure layout information for a
// target machine, based on the TargetData structure.
//
struct StructLayout {
std::vector<uint64_t> MemberOffsets;
uint64_t StructSize;
unsigned StructAlignment;
private:
friend class TargetData; // Only TargetData can create this class
StructLayout(const StructType *ST, const TargetData &TD);
};
} // End llvm namespace
#endif
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