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/MCAssembler.h"
11 #include "llvm/MC/MCExpr.h"
12 #include "llvm/MC/MCFragment.h"
13 #include "llvm/MC/MCSymbol.h"
14
15 using namespace llvm;
16
17 MCObjectWriter::~MCObjectWriter() = default;
18
isSymbolRefDifferenceFullyResolved(const MCAssembler & Asm,const MCSymbolRefExpr * A,const MCSymbolRefExpr * B,bool InSet) const19 bool MCObjectWriter::isSymbolRefDifferenceFullyResolved(
20 const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B,
21 bool InSet) const {
22 // Modified symbol references cannot be resolved.
23 if (A->getKind() != MCSymbolRefExpr::VK_None ||
24 B->getKind() != MCSymbolRefExpr::VK_None)
25 return false;
26
27 const MCSymbol &SA = A->getSymbol();
28 const MCSymbol &SB = B->getSymbol();
29 if (SA.isUndefined() || SB.isUndefined())
30 return false;
31
32 if (!SA.getFragment() || !SB.getFragment())
33 return false;
34
35 return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet);
36 }
37
isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler & Asm,const MCSymbol & A,const MCSymbol & B,bool InSet) const38 bool 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
isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler & Asm,const MCSymbol & SymA,const MCFragment & FB,bool InSet,bool IsPCRel) const45 bool 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