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//===-- llvm/Target/TargetELFWriterInfo.h - ELF Writer Info -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the TargetELFWriterInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETELFWRITERINFO_H
#define LLVM_TARGET_TARGETELFWRITERINFO_H
namespace llvm {
class Function;
class TargetData;
class TargetMachine;
//===--------------------------------------------------------------------===//
// TargetELFWriterInfo
//===--------------------------------------------------------------------===//
class TargetELFWriterInfo {
protected:
// EMachine - This field is the target specific value to emit as the
// e_machine member of the ELF header.
unsigned short EMachine;
TargetMachine &TM;
bool is64Bit, isLittleEndian;
public:
// Machine architectures
enum MachineType {
EM_NONE = 0, // No machine
EM_M32 = 1, // AT&T WE 32100
EM_SPARC = 2, // SPARC
EM_386 = 3, // Intel 386
EM_68K = 4, // Motorola 68000
EM_88K = 5, // Motorola 88000
EM_486 = 6, // Intel 486 (deprecated)
EM_860 = 7, // Intel 80860
EM_MIPS = 8, // MIPS R3000
EM_PPC = 20, // PowerPC
EM_ARM = 40, // ARM
EM_ALPHA = 41, // DEC Alpha
EM_SPARCV9 = 43, // SPARC V9
EM_X86_64 = 62 // AMD64
};
// ELF File classes
enum {
ELFCLASS32 = 1, // 32-bit object file
ELFCLASS64 = 2 // 64-bit object file
};
// ELF Endianess
enum {
ELFDATA2LSB = 1, // Little-endian object file
ELFDATA2MSB = 2 // Big-endian object file
};
explicit TargetELFWriterInfo(TargetMachine &tm);
virtual ~TargetELFWriterInfo();
unsigned short getEMachine() const { return EMachine; }
unsigned getEFlags() const { return 0; }
unsigned getEIClass() const { return is64Bit ? ELFCLASS64 : ELFCLASS32; }
unsigned getEIData() const {
return isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
}
/// ELF Header and ELF Section Header Info
unsigned getHdrSize() const { return is64Bit ? 64 : 52; }
unsigned getSHdrSize() const { return is64Bit ? 64 : 40; }
/// Symbol Table Info
unsigned getSymTabEntrySize() const { return is64Bit ? 24 : 16; }
/// getPrefELFAlignment - Returns the preferred alignment for ELF. This
/// is used to align some sections.
unsigned getPrefELFAlignment() const { return is64Bit ? 8 : 4; }
/// getRelocationEntrySize - Entry size used in the relocation section
unsigned getRelocationEntrySize() const {
return is64Bit ? (hasRelocationAddend() ? 24 : 16)
: (hasRelocationAddend() ? 12 : 8);
}
/// hasCustomJumpTableIndexRelTy - Returns true if the target has a
/// specific relocation type for a jump table index.
virtual bool hasCustomJumpTableIndexRelTy() const { return false; }
/// getJumpTableIndexRelTy - Returns the target specific relocation type
/// for a jump table index.
virtual unsigned getJumpTableIndexRelTy() const { return 0; }
/// getRelocationType - Returns the target specific ELF Relocation type.
/// 'MachineRelTy' contains the object code independent relocation type
virtual unsigned getRelocationType(unsigned MachineRelTy) const = 0;
/// hasRelocationAddend - True if the target uses an addend in the
/// ELF relocation entry.
virtual bool hasRelocationAddend() const = 0;
/// getDefaultAddendForRelTy - Gets the default addend value for a
/// relocation entry based on the target ELF relocation type.
virtual long int getDefaultAddendForRelTy(unsigned RelTy) const = 0;
/// getRelTySize - Returns the size of relocatable field in bits
virtual unsigned getRelocationTySize(unsigned RelTy) const = 0;
/// isPCRelativeRel - True if the relocation type is pc relative
virtual bool isPCRelativeRel(unsigned RelTy) const = 0;
/// getJumpTableRelocationTy - Returns the machine relocation type used
/// to reference a jumptable.
virtual unsigned getAbsoluteLabelMachineRelTy() const = 0;
/// computeRelocation - Some relocatable fields could be relocated
/// directly, avoiding the relocation symbol emission, compute the
/// final relocation value for this symbol.
virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
unsigned RelTy) const = 0;
};
} // end llvm namespace
#endif // LLVM_TARGET_TARGETELFWRITERINFO_H
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