Bill Wendling | 40d7764 | 2007-01-27 02:54:30 +0000 | [diff] [blame] | 1 | //===-- X86ELFWriterInfo.cpp - ELF Writer Info for the X86 backend --------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 4ee451d | 2007-12-29 20:36:04 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Bill Wendling | 40d7764 | 2007-01-27 02:54:30 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements ELF writer information for the X86 backend. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "X86ELFWriterInfo.h" |
Bruno Cardoso Lopes | 0d3193e | 2009-06-22 19:16:16 +0000 | [diff] [blame^] | 15 | #include "X86Relocations.h" |
Bruno Cardoso Lopes | d00d415 | 2009-06-11 22:13:00 +0000 | [diff] [blame] | 16 | #include "llvm/Function.h" |
| 17 | #include "llvm/Target/TargetData.h" |
Bruno Cardoso Lopes | c997d45 | 2009-06-11 19:16:03 +0000 | [diff] [blame] | 18 | #include "llvm/Target/TargetMachine.h" |
Bruno Cardoso Lopes | 0d3193e | 2009-06-22 19:16:16 +0000 | [diff] [blame^] | 19 | |
Bill Wendling | 40d7764 | 2007-01-27 02:54:30 +0000 | [diff] [blame] | 20 | using namespace llvm; |
| 21 | |
Bruno Cardoso Lopes | 0d3193e | 2009-06-22 19:16:16 +0000 | [diff] [blame^] | 22 | //===----------------------------------------------------------------------===// |
| 23 | // Implementation of the X86ELFWriterInfo class |
| 24 | //===----------------------------------------------------------------------===// |
| 25 | |
Bruno Cardoso Lopes | c997d45 | 2009-06-11 19:16:03 +0000 | [diff] [blame] | 26 | X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM) |
| 27 | : TargetELFWriterInfo(TM) { |
| 28 | bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64; |
| 29 | EMachine = is64Bit ? EM_X86_64 : EM_386; |
| 30 | } |
| 31 | |
Bill Wendling | 0db1f0b | 2007-01-27 11:40:32 +0000 | [diff] [blame] | 32 | X86ELFWriterInfo::~X86ELFWriterInfo() {} |
Bruno Cardoso Lopes | c997d45 | 2009-06-11 19:16:03 +0000 | [diff] [blame] | 33 | |
Bruno Cardoso Lopes | 0d3193e | 2009-06-22 19:16:16 +0000 | [diff] [blame^] | 34 | unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const { |
| 35 | if (is64Bit) { |
| 36 | switch(MachineRelTy) { |
| 37 | case X86::reloc_pcrel_word: |
| 38 | return R_X86_64_PC32; |
| 39 | case X86::reloc_absolute_word: |
| 40 | return R_X86_64_32; |
| 41 | case X86::reloc_absolute_dword: |
| 42 | return R_X86_64_64; |
| 43 | case X86::reloc_picrel_word: |
| 44 | default: |
| 45 | assert(0 && "unknown relocation type"); |
| 46 | } |
| 47 | } else { |
| 48 | switch(MachineRelTy) { |
| 49 | case X86::reloc_pcrel_word: |
| 50 | return R_386_PC32; |
| 51 | case X86::reloc_absolute_word: |
| 52 | return R_386_32; |
| 53 | case X86::reloc_absolute_dword: |
| 54 | case X86::reloc_picrel_word: |
| 55 | default: |
| 56 | assert(0 && "unknown relocation type"); |
| 57 | } |
| 58 | } |
| 59 | return 0; |
| 60 | } |
| 61 | |
Bruno Cardoso Lopes | c997d45 | 2009-06-11 19:16:03 +0000 | [diff] [blame] | 62 | unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const { |
| 63 | unsigned FnAlign = 4; |
| 64 | |
| 65 | if (F->hasFnAttr(Attribute::OptimizeForSize)) |
| 66 | FnAlign = 1; |
| 67 | |
| 68 | if (F->getAlignment()) |
| 69 | FnAlign = Log2_32(F->getAlignment()); |
| 70 | |
| 71 | return (1 << FnAlign); |
| 72 | } |
Bruno Cardoso Lopes | 0d3193e | 2009-06-22 19:16:16 +0000 | [diff] [blame^] | 73 | |
| 74 | long int X86ELFWriterInfo::getAddendForRelTy(unsigned RelTy) const { |
| 75 | if (is64Bit) { |
| 76 | switch(RelTy) { |
| 77 | case R_X86_64_PC32: return -4; |
| 78 | break; |
| 79 | default: |
| 80 | assert(0 && "unknown x86 relocation type"); |
| 81 | } |
| 82 | } |
| 83 | return 0; |
| 84 | } |