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
27bool MCELFObjectTargetWriter::needsRelocateWithSymbol(const MCSymbolData &SD,
28                                                      unsigned Type) const {
29  return false;
30}
31
32// ELF doesn't require relocations to be in any order. We sort by the Offset,
33// just to match gnu as for easier comparison. The use type is an arbitrary way
34// of making the sort deterministic.
35static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) {
36  const ELFRelocationEntry &A = *AP;
37  const ELFRelocationEntry &B = *BP;
38  if (A.Offset != B.Offset)
39    return B.Offset - A.Offset;
40  if (B.Type != A.Type)
41    return A.Type - B.Type;
42  //llvm_unreachable("ELFRelocs might be unstable!");
43  return 0;
44}
45
46
47void
48MCELFObjectTargetWriter::sortRelocs(const MCAssembler &Asm,
49                                    std::vector<ELFRelocationEntry> &Relocs) {
50  array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel);
51}
52