1//===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "llvm/MC/MCObjectWriter.h"
10#include "llvm/MC/MCExpr.h"
11#include "llvm/MC/MCFragment.h"
12#include "llvm/MC/MCSymbol.h"
13namespace llvm {
14class MCSection;
15}
16
17using namespace llvm;
18
19MCObjectWriter::~MCObjectWriter() = default;
20
21bool MCObjectWriter::isSymbolRefDifferenceFullyResolved(
22    const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B,
23    bool InSet) const {
24  // Modified symbol references cannot be resolved.
25  if (A->getKind() != MCSymbolRefExpr::VK_None ||
26      B->getKind() != MCSymbolRefExpr::VK_None)
27    return false;
28
29  const MCSymbol &SA = A->getSymbol();
30  const MCSymbol &SB = B->getSymbol();
31  assert(!SA.isUndefined() && !SB.isUndefined());
32  if (!SA.getFragment() || !SB.getFragment())
33    return false;
34
35  return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet);
36}
37
38bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
39    const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B,
40    bool InSet) const {
41  return isSymbolRefDifferenceFullyResolvedImpl(Asm, A, *B.getFragment(), InSet,
42                                                false);
43}
44
45bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
46    const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
47    bool InSet, bool IsPCRel) const {
48  const MCSection &SecA = SymA.getSection();
49  const MCSection &SecB = *FB.getParent();
50  // On ELF and COFF  A - B is absolute if A and B are in the same section.
51  return &SecA == &SecB;
52}
53