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65c4329181
Without this, assembling clang's disassembly would produce an object file with the IMAGE_SCN_CNT_INITIALIZED_DATA section characteristic rather than the uninitialized one. link.exe would warn when merging comdats with different flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197529 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
//===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSectionCOFF::~MCSectionCOFF() {} // anchor.
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// ShouldOmitSectionDirective - Decides whether a '.section' directive
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// should be printed before the section name
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bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
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const MCAsmInfo &MAI) const {
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if (COMDATSymbol)
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return false;
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// FIXME: Does .section .bss/.data/.text work everywhere??
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if (Name == ".text" || Name == ".data" || Name == ".bss")
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return true;
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return false;
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}
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void MCSectionCOFF::setSelection(int Selection,
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const MCSectionCOFF *Assoc) const {
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assert(Selection != 0 && "invalid COMDAT selection type");
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assert((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
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(Assoc != 0) &&
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"associative COMDAT section must have an associated section");
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this->Selection = Selection;
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this->Assoc = Assoc;
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Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
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}
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void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS,
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const MCExpr *Subsection) const {
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// standard sections don't require the '.section'
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if (ShouldOmitSectionDirective(SectionName, MAI)) {
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OS << '\t' << getSectionName() << '\n';
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return;
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}
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OS << "\t.section\t" << getSectionName() << ",\"";
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if (getKind().isText())
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OS << 'x';
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else if (getKind().isBSS())
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OS << 'b';
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if (getKind().isWriteable())
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OS << 'w';
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else
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OS << 'r';
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if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
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OS << 'n';
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OS << '"';
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if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
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OS << ",";
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switch (Selection) {
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case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
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OS << "one_only,";
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break;
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case COFF::IMAGE_COMDAT_SELECT_ANY:
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OS << "discard,";
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break;
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case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
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OS << "same_size,";
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break;
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case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
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OS << "same_contents,";
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break;
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case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
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OS << "associative " << Assoc->getSectionName() << ",";
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break;
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case COFF::IMAGE_COMDAT_SELECT_LARGEST:
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OS << "largest,";
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break;
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case COFF::IMAGE_COMDAT_SELECT_NEWEST:
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OS << "newest,";
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break;
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default:
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assert (0 && "unsupported COFF selection type");
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break;
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}
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assert(COMDATSymbol);
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OS << *COMDATSymbol;
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}
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OS << '\n';
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}
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bool MCSectionCOFF::UseCodeAlign() const {
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return getKind().isText();
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}
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bool MCSectionCOFF::isVirtualSection() const {
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return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
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}
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