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1308256cf8
This makes using array_pod_sort significantly safer. The implementation relies on function pointer casting but that should be safe as we're dealing with void* here. llvm-svn: 191175
62 lines
2.5 KiB
C++
62 lines
2.5 KiB
C++
//===-- MCELFObjectTargetWriter.cpp - ELF Target Writer Subclass ----------===//
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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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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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using namespace llvm;
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MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_,
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uint8_t OSABI_,
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uint16_t EMachine_,
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bool HasRelocationAddend_,
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bool IsN64_)
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: OSABI(OSABI_), EMachine(EMachine_),
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HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_),
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IsN64(IsN64_){
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}
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const MCSymbol *MCELFObjectTargetWriter::ExplicitRelSym(const MCAssembler &Asm,
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const MCValue &Target,
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const MCFragment &F,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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return NULL;
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}
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const MCSymbol *MCELFObjectTargetWriter::undefinedExplicitRelSym(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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const MCSymbol &Symbol = Target.getSymA()->getSymbol();
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return &Symbol.AliasedSymbol();
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}
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// ELF doesn't require relocations to be in any order. We sort by the r_offset,
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// just to match gnu as for easier comparison. The use type and index is an
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// arbitrary way of making the sort deterministic.
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static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) {
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const ELFRelocationEntry &A = *AP;
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const ELFRelocationEntry &B = *BP;
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if (A.r_offset != B.r_offset)
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return B.r_offset - A.r_offset;
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if (B.Type != A.Type)
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return A.Type - B.Type;
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if (B.Index != A.Index)
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return B.Index - A.Index;
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llvm_unreachable("ELFRelocs might be unstable!");
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}
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void
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MCELFObjectTargetWriter::sortRelocs(const MCAssembler &Asm,
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std::vector<ELFRelocationEntry> &Relocs) {
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array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel);
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}
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