1 //===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCSectionCOFF.h"
11 #include "llvm/MC/MCAsmInfo.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCSymbol.h"
14 #include "llvm/Support/raw_ostream.h"
17 MCSectionCOFF::~MCSectionCOFF() {} // anchor.
19 // ShouldOmitSectionDirective - Decides whether a '.section' directive
20 // should be printed before the section name
21 bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
22 const MCAsmInfo &MAI) const {
24 // FIXME: Does .section .bss/.data/.text work everywhere??
25 if (Name == ".text" || Name == ".data" || Name == ".bss")
31 void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
33 const MCExpr *Subsection) const {
35 // standard sections don't require the '.section'
36 if (ShouldOmitSectionDirective(SectionName, MAI)) {
37 OS << '\t' << getSectionName() << '\n';
41 OS << "\t.section\t" << getSectionName() << ",\"";
42 if (getKind().isText())
44 if (getKind().isWriteable())
48 if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
52 if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
54 case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
55 OS << "\t.linkonce one_only\n";
57 case COFF::IMAGE_COMDAT_SELECT_ANY:
58 OS << "\t.linkonce discard\n";
60 case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
61 OS << "\t.linkonce same_size\n";
63 case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
64 OS << "\t.linkonce same_contents\n";
66 //NOTE: as of binutils 2.20, there is no way to specifiy select largest
67 // with the .linkonce directive. For now, we treat it as an invalid
68 // comdat selection value.
69 case COFF::IMAGE_COMDAT_SELECT_LARGEST:
70 // OS << "\t.linkonce largest\n";
73 assert (0 && "unsupported COFF selection type");
79 bool MCSectionCOFF::UseCodeAlign() const {
80 return getKind().isText();
83 bool MCSectionCOFF::isVirtualSection() const {
84 return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;