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 15 using namespace llvm; 16 17 MCELFObjectTargetWriter::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 27 const 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 35 const 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. 45 static int cmpRel(const void *AP, const void *BP) { 46 const ELFRelocationEntry &A = *(const ELFRelocationEntry *)AP; 47 const ELFRelocationEntry &B = *(const ELFRelocationEntry *)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 57 void 58 MCELFObjectTargetWriter::sortRelocs(const MCAssembler &Asm, 59 std::vector<ELFRelocationEntry> &Relocs) { 60 array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel); 61 } 62
