1 //===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
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
7 //===----------------------------------------------------------------------===//
9 #include "llvm/MC/MCSectionCOFF.h"
10 #include "llvm/BinaryFormat/COFF.h"
11 #include "llvm/MC/MCSymbol.h"
12 #include "llvm/Support/raw_ostream.h"
17 // ShouldOmitSectionDirective - Decides whether a '.section' directive
18 // should be printed before the section name
19 bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
20 const MCAsmInfo &MAI) const {
24 // FIXME: Does .section .bss/.data/.text work everywhere??
25 if (Name == ".text" || Name == ".data" || Name == ".bss")
31 void MCSectionCOFF::setSelection(int Selection) const {
32 assert(Selection != 0 && "invalid COMDAT selection type");
33 this->Selection = Selection;
34 Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
37 void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
39 const MCExpr *Subsection) const {
40 // standard sections don't require the '.section'
41 if (ShouldOmitSectionDirective(SectionName, MAI)) {
42 OS << '\t' << getSectionName() << '\n';
46 OS << "\t.section\t" << getSectionName() << ",\"";
47 if (getCharacteristics() & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
49 if (getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
51 if (getCharacteristics() & COFF::IMAGE_SCN_MEM_EXECUTE)
53 if (getCharacteristics() & COFF::IMAGE_SCN_MEM_WRITE)
55 else if (getCharacteristics() & COFF::IMAGE_SCN_MEM_READ)
59 if (getCharacteristics() & COFF::IMAGE_SCN_LNK_REMOVE)
61 if (getCharacteristics() & COFF::IMAGE_SCN_MEM_SHARED)
63 if ((getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE) &&
64 !isImplicitlyDiscardable(SectionName))
68 if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
72 OS << "\n\t.linkonce\t";
74 case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
77 case COFF::IMAGE_COMDAT_SELECT_ANY:
80 case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
83 case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
84 OS << "same_contents";
86 case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
89 case COFF::IMAGE_COMDAT_SELECT_LARGEST:
92 case COFF::IMAGE_COMDAT_SELECT_NEWEST:
96 assert(false && "unsupported COFF selection type");
101 COMDATSymbol->print(OS, &MAI);
107 bool MCSectionCOFF::UseCodeAlign() const {
108 return getKind().isText();
111 bool MCSectionCOFF::isVirtualSection() const {
112 return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;