| //===-- MCELFObjectTargetWriter.cpp - ELF Target Writer Subclass ----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/MC/MCELFObjectWriter.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCValue.h" |
| |
| using namespace llvm; |
| |
| MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_, |
| uint8_t OSABI_, |
| uint16_t EMachine_, |
| bool HasRelocationAddend_, |
| bool IsN64_) |
| : OSABI(OSABI_), EMachine(EMachine_), |
| HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_), |
| IsN64(IsN64_){ |
| } |
| |
| const MCSymbol *MCELFObjectTargetWriter::ExplicitRelSym(const MCAssembler &Asm, |
| const MCValue &Target, |
| const MCFragment &F, |
| const MCFixup &Fixup, |
| bool IsPCRel) const { |
| return NULL; |
| } |
| |
| const MCSymbol *MCELFObjectTargetWriter::undefinedExplicitRelSym(const MCValue &Target, |
| const MCFixup &Fixup, |
| bool IsPCRel) const { |
| const MCSymbol &Symbol = Target.getSymA()->getSymbol(); |
| return &Symbol.AliasedSymbol(); |
| } |
| |
| // ELF doesn't require relocations to be in any order. We sort by the r_offset, |
| // just to match gnu as for easier comparison. The use type and index is an |
| // arbitrary way of making the sort deterministic. |
| static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) { |
| const ELFRelocationEntry &A = *AP; |
| const ELFRelocationEntry &B = *BP; |
| if (A.r_offset != B.r_offset) |
| return B.r_offset - A.r_offset; |
| if (B.Type != A.Type) |
| return A.Type - B.Type; |
| if (B.Index != A.Index) |
| return B.Index - A.Index; |
| llvm_unreachable("ELFRelocs might be unstable!"); |
| } |
| |
| void |
| MCELFObjectTargetWriter::sortRelocs(const MCAssembler &Asm, |
| std::vector<ELFRelocationEntry> &Relocs) { |
| array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel); |
| } |