mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-26 18:20:39 +00:00
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 --------===//
|
|
//
|
|
// 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 {
|
|
if (COMDATSymbol)
|
|
return false;
|
|
|
|
// 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';
|
|
else if (getKind().isBSS())
|
|
OS << 'b';
|
|
if (getKind().isWriteable())
|
|
OS << 'w';
|
|
else
|
|
OS << 'r';
|
|
if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
|
|
OS << 'n';
|
|
|
|
OS << '"';
|
|
|
|
if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
|
|
OS << ",";
|
|
switch (Selection) {
|
|
case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
|
|
OS << "one_only,";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_ANY:
|
|
OS << "discard,";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
|
|
OS << "same_size,";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
|
|
OS << "same_contents,";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
|
|
OS << "associative " << Assoc->getSectionName() << ",";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_LARGEST:
|
|
OS << "largest,";
|
|
break;
|
|
case COFF::IMAGE_COMDAT_SELECT_NEWEST:
|
|
OS << "newest,";
|
|
break;
|
|
default:
|
|
assert (0 && "unsupported COFF selection type");
|
|
break;
|
|
}
|
|
assert(COMDATSymbol);
|
|
OS << *COMDATSymbol;
|
|
}
|
|
OS << '\n';
|
|
}
|
|
|
|
bool MCSectionCOFF::UseCodeAlign() const {
|
|
return getKind().isText();
|
|
}
|
|
|
|
bool MCSectionCOFF::isVirtualSection() const {
|
|
return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
|
|
}
|