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//===- MC/MCAsmInfoXCOFF.cpp - XCOFF asm properties ------------ *- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCAsmInfoXCOFF.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace llvm {
extern cl::opt<cl::boolOrDefault> UseLEB128Directives;
}
MCAsmInfoXCOFF::MCAsmInfoXCOFF() {
IsAIX = true;
IsLittleEndian = false;
PrivateGlobalPrefix = "L..";
PrivateLabelPrefix = "L..";
SupportsQuotedNames = false;
if (UseLEB128Directives == cl::BOU_UNSET)
HasLEB128Directives = false;
ZeroDirective = "\t.space\t";
AsciiDirective = nullptr; // not supported
AscizDirective = nullptr; // not supported
CharacterLiteralSyntax = ACLS_SingleQuotePrefix;
// Use .vbyte for data definition to avoid directives that apply an implicit
// alignment.
Data16bitsDirective = "\t.vbyte\t2, ";
Data32bitsDirective = "\t.vbyte\t4, ";
COMMDirectiveAlignmentIsInBytes = false;
LCOMMDirectiveAlignmentType = LCOMM::Log2Alignment;
HasDotTypeDotSizeDirective = false;
ParseInlineAsmUsingAsmParser = true;
ExceptionsType = ExceptionHandling::AIX;
}
bool MCAsmInfoXCOFF::isAcceptableChar(char C) const {
// QualName is allowed for a MCSymbolXCOFF, and
// QualName contains '[' and ']'.
if (C == '[' || C == ']')
return true;
// For AIX assembler, symbols may consist of numeric digits,
// underscores, periods, uppercase or lowercase letters, or
// any combination of these.
return isAlnum(C) || C == '_' || C == '.';
}
bool MCAsmInfoXCOFF::useCodeAlign(const MCSection &Sec) const {
return static_cast<const MCSectionXCOFF &>(Sec).getKind().isText();
}
MCSectionXCOFF::~MCSectionXCOFF() = default;
void MCSectionXCOFF::printCsectDirective(raw_ostream &OS) const {
OS << "\t.csect " << QualName->getName() << "," << Log2(getAlign()) << '\n';
}
void MCAsmInfoXCOFF::printSwitchToSection(const MCSection &Section, uint32_t,
const Triple &T,
raw_ostream &OS) const {
auto &Sec = static_cast<const MCSectionXCOFF &>(Section);
if (Sec.getKind().isText()) {
if (Sec.getMappingClass() != XCOFF::XMC_PR)
report_fatal_error("Unhandled storage-mapping class for .text csect");
Sec.printCsectDirective(OS);
return;
}
if (Sec.getKind().isReadOnly()) {
if (Sec.getMappingClass() != XCOFF::XMC_RO &&
Sec.getMappingClass() != XCOFF::XMC_TD)
report_fatal_error("Unhandled storage-mapping class for .rodata csect.");
Sec.printCsectDirective(OS);
return;
}
if (Sec.getKind().isReadOnlyWithRel()) {
if (Sec.getMappingClass() != XCOFF::XMC_RW &&
Sec.getMappingClass() != XCOFF::XMC_RO &&
Sec.getMappingClass() != XCOFF::XMC_TD)
report_fatal_error(
"Unexepected storage-mapping class for ReadOnlyWithRel kind");
Sec.printCsectDirective(OS);
return;
}
// Initialized TLS data.
if (Sec.getKind().isThreadData()) {
// We only expect XMC_TL here for initialized TLS data.
if (Sec.getMappingClass() != XCOFF::XMC_TL)
report_fatal_error("Unhandled storage-mapping class for .tdata csect.");
Sec.printCsectDirective(OS);
return;
}
if (Sec.getKind().isData()) {
switch (Sec.getMappingClass()) {
case XCOFF::XMC_RW:
case XCOFF::XMC_DS:
case XCOFF::XMC_TD:
Sec.printCsectDirective(OS);
break;
case XCOFF::XMC_TC:
case XCOFF::XMC_TE:
break;
case XCOFF::XMC_TC0:
OS << "\t.toc\n";
break;
default:
report_fatal_error("Unhandled storage-mapping class for .data csect.");
}
return;
}
if (Sec.isCsect() && Sec.getMappingClass() == XCOFF::XMC_TD) {
// Common csect type (uninitialized storage) does not have to print
// csect directive for section switching unless it is local.
if (Sec.getKind().isCommon() && !Sec.getKind().isBSSLocal())
return;
assert(Sec.getKind().isBSS() && "Unexpected section kind for toc-data");
Sec.printCsectDirective(OS);
return;
}
// Common csect type (uninitialized storage) does not have to print csect
// directive for section switching.
if (Sec.isCsect() && Sec.getCSectType() == XCOFF::XTY_CM) {
assert((Sec.getMappingClass() == XCOFF::XMC_RW ||
Sec.getMappingClass() == XCOFF::XMC_BS ||
Sec.getMappingClass() == XCOFF::XMC_UL) &&
"Generated a storage-mapping class for a common/bss/tbss csect we "
"don't "
"understand how to switch to.");
// Common symbols and local zero-initialized symbols for TLS and Non-TLS are
// eligible for .bss/.tbss csect, getKind().isThreadBSS() is used to
// cover TLS common and zero-initialized local symbols since linkage type
// (in the GlobalVariable) is not accessible in this class.
assert((Sec.getKind().isBSSLocal() || Sec.getKind().isCommon() ||
Sec.getKind().isThreadBSS()) &&
"wrong symbol type for .bss/.tbss csect");
// Don't have to print a directive for switching to section for commons
// and zero-initialized TLS data. The '.comm' and '.lcomm' directives of the
// variable will create the needed csect.
return;
}
// Zero-initialized TLS data with weak or external linkage are not eligible to
// be put into common csect.
if (Sec.getKind().isThreadBSS()) {
Sec.printCsectDirective(OS);
return;
}
// XCOFF debug sections.
if (Sec.getKind().isMetadata() && Sec.isDwarfSect()) {
OS << "\n\t.dwsect " << format("0x%" PRIx32, *Sec.getDwarfSubtypeFlags())
<< '\n';
OS << Sec.getName() << ':' << '\n';
return;
}
report_fatal_error("Printing for this SectionKind is unimplemented.");
}
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