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82a70ccb24
their appropriate sections before the code itself. They need to be emitted before the function because on some targets (x86 but not x86_64) the later may reference a JT or CP entry address git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76672 91177308-0d34-0410-b5e6-96231b3b80d8
132 lines
4.7 KiB
C++
132 lines
4.7 KiB
C++
//===-- llvm/Target/TargetELFWriterInfo.h - ELF Writer Info -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the TargetELFWriterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETELFWRITERINFO_H
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#define LLVM_TARGET_TARGETELFWRITERINFO_H
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namespace llvm {
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class Function;
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class TargetData;
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class TargetMachine;
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//===--------------------------------------------------------------------===//
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// TargetELFWriterInfo
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//===--------------------------------------------------------------------===//
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class TargetELFWriterInfo {
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protected:
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// EMachine - This field is the target specific value to emit as the
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// e_machine member of the ELF header.
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unsigned short EMachine;
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TargetMachine &TM;
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bool is64Bit, isLittleEndian;
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public:
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// Machine architectures
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enum MachineType {
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EM_NONE = 0, // No machine
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EM_M32 = 1, // AT&T WE 32100
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EM_SPARC = 2, // SPARC
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EM_386 = 3, // Intel 386
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EM_68K = 4, // Motorola 68000
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EM_88K = 5, // Motorola 88000
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EM_486 = 6, // Intel 486 (deprecated)
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EM_860 = 7, // Intel 80860
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EM_MIPS = 8, // MIPS R3000
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EM_PPC = 20, // PowerPC
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EM_ARM = 40, // ARM
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EM_ALPHA = 41, // DEC Alpha
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EM_SPARCV9 = 43, // SPARC V9
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EM_X86_64 = 62 // AMD64
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};
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// ELF File classes
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enum {
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ELFCLASS32 = 1, // 32-bit object file
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ELFCLASS64 = 2 // 64-bit object file
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};
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// ELF Endianess
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enum {
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ELFDATA2LSB = 1, // Little-endian object file
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ELFDATA2MSB = 2 // Big-endian object file
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};
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explicit TargetELFWriterInfo(TargetMachine &tm);
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virtual ~TargetELFWriterInfo();
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unsigned short getEMachine() const { return EMachine; }
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unsigned getEFlags() const { return 0; }
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unsigned getEIClass() const { return is64Bit ? ELFCLASS64 : ELFCLASS32; }
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unsigned getEIData() const {
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return isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
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}
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/// ELF Header and ELF Section Header Info
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unsigned getHdrSize() const { return is64Bit ? 64 : 52; }
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unsigned getSHdrSize() const { return is64Bit ? 64 : 40; }
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/// Symbol Table Info
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unsigned getSymTabEntrySize() const { return is64Bit ? 24 : 16; }
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/// getPrefELFAlignment - Returns the preferred alignment for ELF. This
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/// is used to align some sections.
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unsigned getPrefELFAlignment() const { return is64Bit ? 8 : 4; }
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/// getRelocationEntrySize - Entry size used in the relocation section
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unsigned getRelocationEntrySize() const {
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return is64Bit ? (hasRelocationAddend() ? 24 : 16)
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: (hasRelocationAddend() ? 12 : 8);
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}
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/// hasCustomJumpTableIndexRelTy - Returns true if the target has a
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/// specific relocation type for a jump table index.
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virtual bool hasCustomJumpTableIndexRelTy() const { return false; }
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/// getJumpTableIndexRelTy - Returns the target specific relocation type
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/// for a jump table index.
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virtual unsigned getJumpTableIndexRelTy() const { return 0; }
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/// getRelocationType - Returns the target specific ELF Relocation type.
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/// 'MachineRelTy' contains the object code independent relocation type
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virtual unsigned getRelocationType(unsigned MachineRelTy) const = 0;
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/// hasRelocationAddend - True if the target uses an addend in the
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/// ELF relocation entry.
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virtual bool hasRelocationAddend() const = 0;
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/// getDefaultAddendForRelTy - Gets the default addend value for a
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/// relocation entry based on the target ELF relocation type.
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virtual long int getDefaultAddendForRelTy(unsigned RelTy) const = 0;
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/// getRelTySize - Returns the size of relocatable field in bits
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virtual unsigned getRelocationTySize(unsigned RelTy) const = 0;
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/// isPCRelativeRel - True if the relocation type is pc relative
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virtual bool isPCRelativeRel(unsigned RelTy) const = 0;
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/// getJumpTableRelocationTy - Returns the machine relocation type used
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/// to reference a jumptable.
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virtual unsigned getAbsoluteLabelMachineRelTy() const = 0;
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/// computeRelocation - Some relocatable fields could be relocated
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/// directly, avoiding the relocation symbol emission, compute the
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/// final relocation value for this symbol.
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virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
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unsigned RelTy) const = 0;
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};
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} // end llvm namespace
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#endif // LLVM_TARGET_TARGETELFWRITERINFO_H
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