1//===-- MCELFObjectTargetWriter.cpp - ELF Target Writer Subclass ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "llvm/ADT/STLExtras.h" 11#include "llvm/MC/MCELFObjectWriter.h" 12#include "llvm/MC/MCExpr.h" 13#include "llvm/MC/MCValue.h" 14 15using namespace llvm; 16 17MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_, 18 uint8_t OSABI_, 19 uint16_t EMachine_, 20 bool HasRelocationAddend_, 21 bool IsN64_) 22 : OSABI(OSABI_), EMachine(EMachine_), 23 HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_), 24 IsN64(IsN64_){ 25} 26 27const MCSymbol *MCELFObjectTargetWriter::ExplicitRelSym(const MCAssembler &Asm, 28 const MCValue &Target, 29 const MCFragment &F, 30 const MCFixup &Fixup, 31 bool IsPCRel) const { 32 return NULL; 33} 34 35const MCSymbol *MCELFObjectTargetWriter::undefinedExplicitRelSym(const MCValue &Target, 36 const MCFixup &Fixup, 37 bool IsPCRel) const { 38 const MCSymbol &Symbol = Target.getSymA()->getSymbol(); 39 return &Symbol.AliasedSymbol(); 40} 41 42// ELF doesn't require relocations to be in any order. We sort by the r_offset, 43// just to match gnu as for easier comparison. The use type and index is an 44// arbitrary way of making the sort deterministic. 45static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) { 46 const ELFRelocationEntry &A = *AP; 47 const ELFRelocationEntry &B = *BP; 48 if (A.r_offset != B.r_offset) 49 return B.r_offset - A.r_offset; 50 if (B.Type != A.Type) 51 return A.Type - B.Type; 52 if (B.Index != A.Index) 53 return B.Index - A.Index; 54 llvm_unreachable("ELFRelocs might be unstable!"); 55} 56 57void 58MCELFObjectTargetWriter::sortRelocs(const MCAssembler &Asm, 59 std::vector<ELFRelocationEntry> &Relocs) { 60 array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel); 61} 62