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//===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
MCSectionCOFF::~MCSectionCOFF() {} // anchor.
// ShouldOmitSectionDirective - Decides whether a '.section' directive
// should be printed before the section name
bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
const MCAsmInfo &MAI) const {
// FIXME: Does .section .bss/.data/.text work everywhere??
if (Name == ".text" || Name == ".data" || Name == ".bss")
return true;
return false;
}
void MCSectionCOFF::setSelection(int Selection,
const MCSectionCOFF *Assoc) const {
assert(Selection != 0 && "invalid COMDAT selection type");
assert((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
(Assoc != 0) &&
"associative COMDAT section must have an associated section");
this->Selection = Selection;
this->Assoc = Assoc;
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
}
void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS,
const MCExpr *Subsection) const {
// standard sections don't require the '.section'
if (ShouldOmitSectionDirective(SectionName, MAI)) {
OS << '\t' << getSectionName() << '\n';
return;
}
OS << "\t.section\t" << getSectionName() << ",\"";
if (getKind().isText())
OS << 'x';
if (getKind().isWriteable())
OS << 'w';
else
OS << 'r';
if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
OS << 'n';
OS << "\"\n";
if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
switch (Selection) {
case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
OS << "\t.linkonce one_only\n";
break;
case COFF::IMAGE_COMDAT_SELECT_ANY:
OS << "\t.linkonce discard\n";
break;
case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
OS << "\t.linkonce same_size\n";
break;
case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
OS << "\t.linkonce same_contents\n";
break;
case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
OS << "\t.linkonce associative " << Assoc->getSectionName() << "\n";
break;
case COFF::IMAGE_COMDAT_SELECT_LARGEST:
OS << "\t.linkonce largest\n";
break;
case COFF::IMAGE_COMDAT_SELECT_NEWEST:
OS << "\t.linkonce newest\n";
break;
default:
assert (0 && "unsupported COFF selection type");
break;
}
}
}
bool MCSectionCOFF::UseCodeAlign() const {
return getKind().isText();
}
bool MCSectionCOFF::isVirtualSection() const {
return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
}
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