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//===- ELFAsmParser.cpp - ELF Assembly Parser -----------------------------===//
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// The LLVM Compiler Infrastructure
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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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#include "llvm/MC/MCParser/MCAsmParserExtension.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Twine.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/MCExpr.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/Support/ELF.h"
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class ELFAsmParser : public MCAsmParserExtension {
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template<bool (ELFAsmParser::*HandlerMethod)(StringRef, SMLoc)>
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void addDirectiveHandler(StringRef Directive) {
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MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
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this, HandleDirective<ELFAsmParser, HandlerMethod>);
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getParser().addDirectiveHandler(Directive, Handler);
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bool ParseSectionSwitch(StringRef Section, unsigned Type, unsigned Flags,
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ELFAsmParser() { BracketExpressionsSupported = true; }
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void Initialize(MCAsmParser &Parser) override {
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// Call the base implementation.
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this->MCAsmParserExtension::Initialize(Parser);
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveData>(".data");
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveText>(".text");
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveBSS>(".bss");
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveRoData>(".rodata");
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveTData>(".tdata");
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addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveTBSS>(".tbss");
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&ELFAsmParser::ParseSectionDirectiveDataRel>(".data.rel");
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&ELFAsmParser::ParseSectionDirectiveDataRelRo>(".data.rel.ro");
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&ELFAsmParser::ParseSectionDirectiveDataRelRoLocal>(".data.rel.ro.local");
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&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
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&ELFAsmParser::ParseDirectivePushSection>(".pushsection");
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addDirectiveHandler<&ELFAsmParser::ParseDirectivePopSection>(".popsection");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSize>(".size");
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addDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveIdent>(".ident");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymver>(".symver");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveVersion>(".version");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveWeakref>(".weakref");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".local");
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".protected");
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".internal");
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".hidden");
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addDirectiveHandler<&ELFAsmParser::ParseDirectiveSubsection>(".subsection");
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// FIXME: Part of this logic is duplicated in the MCELFStreamer. What is
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// the best way for us to get access to it?
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bool ParseSectionDirectiveData(StringRef, SMLoc) {
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return ParseSectionSwitch(".data", ELF::SHT_PROGBITS,
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ELF::SHF_WRITE |ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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bool ParseSectionDirectiveText(StringRef, SMLoc) {
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return ParseSectionSwitch(".text", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC, SectionKind::getText());
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bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".bss", ELF::SHT_NOBITS,
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ELF::SHF_ALLOC, SectionKind::getBSS());
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bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
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return ParseSectionSwitch(".rodata", ELF::SHT_PROGBITS,
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SectionKind::getReadOnly());
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bool ParseSectionDirectiveTData(StringRef, SMLoc) {
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return ParseSectionSwitch(".tdata", ELF::SHT_PROGBITS,
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ELF::SHF_TLS | ELF::SHF_WRITE,
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SectionKind::getThreadData());
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bool ParseSectionDirectiveTBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".tbss", ELF::SHT_NOBITS,
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ELF::SHF_TLS | ELF::SHF_WRITE,
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SectionKind::getThreadBSS());
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bool ParseSectionDirectiveDataRel(StringRef, SMLoc) {
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return ParseSectionSwitch(".data.rel", ELF::SHT_PROGBITS,
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SectionKind::getDataRel());
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bool ParseSectionDirectiveDataRelRo(StringRef, SMLoc) {
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return ParseSectionSwitch(".data.rel.ro", ELF::SHT_PROGBITS,
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SectionKind::getReadOnlyWithRel());
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bool ParseSectionDirectiveDataRelRoLocal(StringRef, SMLoc) {
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return ParseSectionSwitch(".data.rel.ro.local", ELF::SHT_PROGBITS,
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SectionKind::getReadOnlyWithRelLocal());
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bool ParseSectionDirectiveEhFrame(StringRef, SMLoc) {
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return ParseSectionSwitch(".eh_frame", ELF::SHT_PROGBITS,
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SectionKind::getDataRel());
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bool ParseDirectivePushSection(StringRef, SMLoc);
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bool ParseDirectivePopSection(StringRef, SMLoc);
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bool ParseDirectiveSection(StringRef, SMLoc);
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bool ParseDirectiveSize(StringRef, SMLoc);
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bool ParseDirectivePrevious(StringRef, SMLoc);
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bool ParseDirectiveType(StringRef, SMLoc);
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bool ParseDirectiveIdent(StringRef, SMLoc);
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bool ParseDirectiveSymver(StringRef, SMLoc);
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bool ParseDirectiveVersion(StringRef, SMLoc);
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bool ParseDirectiveWeakref(StringRef, SMLoc);
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bool ParseDirectiveSymbolAttribute(StringRef, SMLoc);
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bool ParseDirectiveSubsection(StringRef, SMLoc);
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bool ParseSectionName(StringRef &SectionName);
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bool ParseSectionArguments(bool IsPush, SMLoc loc);
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unsigned parseSunStyleSectionFlags();
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/// ParseDirectiveSymbolAttribute
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/// ::= { ".local", ".weak", ... } [ identifier ( , identifier )* ]
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bool ELFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
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MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Directive)
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.Case(".weak", MCSA_Weak)
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.Case(".local", MCSA_Local)
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.Case(".hidden", MCSA_Hidden)
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.Case(".internal", MCSA_Internal)
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.Case(".protected", MCSA_Protected)
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.Default(MCSA_Invalid);
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assert(Attr != MCSA_Invalid && "unexpected symbol attribute directive!");
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if (getLexer().isNot(AsmToken::EndOfStatement)) {
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if (getParser().parseIdentifier(Name))
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return TokError("expected identifier in directive");
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MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
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getStreamer().EmitSymbolAttribute(Sym, Attr);
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if (getLexer().is(AsmToken::EndOfStatement))
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in directive");
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bool ELFAsmParser::ParseSectionSwitch(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind) {
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const MCExpr *Subsection = nullptr;
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if (getLexer().isNot(AsmToken::EndOfStatement)) {
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if (getParser().parseExpression(Subsection))
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getStreamer().SwitchSection(getContext().getELFSection(Section, Type, Flags),
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bool ELFAsmParser::ParseDirectiveSize(StringRef, SMLoc) {
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if (getParser().parseIdentifier(Name))
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return TokError("expected identifier in directive");
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MCSymbolELF *Sym = cast<MCSymbolELF>(getContext().getOrCreateSymbol(Name));
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in directive");
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if (getParser().parseExpression(Expr))
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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getStreamer().emitELFSize(Sym, Expr);
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bool ELFAsmParser::ParseSectionName(StringRef &SectionName) {
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// A section name can contain -, so we cannot just use
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SMLoc FirstLoc = getLexer().getLoc();
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if (getLexer().is(AsmToken::String)) {
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SectionName = getTok().getIdentifier();
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SMLoc PrevLoc = getLexer().getLoc();
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if (getLexer().is(AsmToken::Minus)) {
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Lex(); // Consume the "-".
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} else if (getLexer().is(AsmToken::String)) {
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CurSize = getTok().getIdentifier().size() + 2;
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} else if (getLexer().is(AsmToken::Identifier)) {
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CurSize = getTok().getIdentifier().size();
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SectionName = StringRef(FirstLoc.getPointer(), Size);
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// Make sure the following token is adjacent.
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if (PrevLoc.getPointer() + CurSize != getTok().getLoc().getPointer())
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static unsigned parseSectionFlags(StringRef flagsStr, bool *UseLastGroup) {
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for (unsigned i = 0; i < flagsStr.size(); i++) {
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switch (flagsStr[i]) {
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flags |= ELF::SHF_ALLOC;
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flags |= ELF::SHF_EXCLUDE;
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flags |= ELF::SHF_EXECINSTR;
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flags |= ELF::SHF_WRITE;
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flags |= ELF::SHF_MERGE;
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flags |= ELF::SHF_STRINGS;
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flags |= ELF::SHF_TLS;
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flags |= ELF::XCORE_SHF_CP_SECTION;
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flags |= ELF::XCORE_SHF_DP_SECTION;
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flags |= ELF::SHF_GROUP;
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*UseLastGroup = true;
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unsigned ELFAsmParser::parseSunStyleSectionFlags() {
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while (getLexer().is(AsmToken::Hash)) {
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if (!getLexer().is(AsmToken::Identifier))
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StringRef flagId = getTok().getIdentifier();
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if (flagId == "alloc")
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flags |= ELF::SHF_ALLOC;
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else if (flagId == "execinstr")
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flags |= ELF::SHF_EXECINSTR;
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else if (flagId == "write")
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flags |= ELF::SHF_WRITE;
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else if (flagId == "tls")
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flags |= ELF::SHF_TLS;
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Lex(); // Eat the flag.
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if (!getLexer().is(AsmToken::Comma))
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Lex(); // Eat the comma.
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bool ELFAsmParser::ParseDirectivePushSection(StringRef s, SMLoc loc) {
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getStreamer().PushSection();
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if (ParseSectionArguments(/*IsPush=*/true, loc)) {
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getStreamer().PopSection();
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bool ELFAsmParser::ParseDirectivePopSection(StringRef, SMLoc) {
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if (!getStreamer().PopSection())
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return TokError(".popsection without corresponding .pushsection");
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// FIXME: This is a work in progress.
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bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc loc) {
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return ParseSectionArguments(/*IsPush=*/false, loc);
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bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
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StringRef SectionName;
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if (ParseSectionName(SectionName))
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return TokError("expected identifier in directive");
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const MCExpr *Subsection = nullptr;
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bool UseLastGroup = false;
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int64_t UniqueID = ~0;
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// Set the defaults first.
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if (SectionName == ".fini" || SectionName == ".init" ||
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SectionName == ".rodata")
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Flags |= ELF::SHF_ALLOC;
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if (SectionName == ".fini" || SectionName == ".init")
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Flags |= ELF::SHF_EXECINSTR;
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if (getLexer().is(AsmToken::Comma)) {
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if (IsPush && getLexer().isNot(AsmToken::String)) {
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if (getParser().parseExpression(Subsection))
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if (getLexer().isNot(AsmToken::Comma))
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if (getLexer().isNot(AsmToken::String)) {
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if (!getContext().getAsmInfo()->usesSunStyleELFSectionSwitchSyntax()
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|| getLexer().isNot(AsmToken::Hash))
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return TokError("expected string in directive");
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extraFlags = parseSunStyleSectionFlags();
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StringRef FlagsStr = getTok().getStringContents();
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extraFlags = parseSectionFlags(FlagsStr, &UseLastGroup);
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if (extraFlags == -1U)
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return TokError("unknown flag");
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bool Mergeable = Flags & ELF::SHF_MERGE;
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bool Group = Flags & ELF::SHF_GROUP;
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if (Group && UseLastGroup)
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return TokError("Section cannot specifiy a group name while also acting "
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"as a member of the last group");
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if (getLexer().isNot(AsmToken::Comma)) {
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return TokError("Mergeable section must specify the type");
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return TokError("Group section must specify the type");
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if (getLexer().is(AsmToken::At) || getLexer().is(AsmToken::Percent) ||
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getLexer().is(AsmToken::String)) {
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if (!getLexer().is(AsmToken::String))
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return TokError("expected '@<type>', '%<type>' or \"<type>\"");
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if (getParser().parseIdentifier(TypeName))
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return TokError("expected identifier in directive");
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected the entry size");
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if (getParser().parseAbsoluteExpression(Size))
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return TokError("entry size must be positive");
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected group name");
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if (getParser().parseIdentifier(GroupName))
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if (getLexer().is(AsmToken::Comma)) {
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if (getParser().parseIdentifier(Linkage))
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if (Linkage != "comdat")
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return TokError("Linkage must be 'comdat'");
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if (getLexer().is(AsmToken::Comma)) {
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if (getParser().parseIdentifier(UniqueStr))
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return TokError("expected identifier in directive");
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if (UniqueStr != "unique")
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return TokError("expected 'unique'");
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected commma");
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if (getParser().parseAbsoluteExpression(UniqueID))
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return TokError("unique id must be positive");
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if (!isUInt<32>(UniqueID) || UniqueID == ~0U)
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return TokError("unique id is too large");
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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unsigned Type = ELF::SHT_PROGBITS;
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if (TypeName.empty()) {
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if (SectionName.startswith(".note"))
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Type = ELF::SHT_NOTE;
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else if (SectionName == ".init_array")
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Type = ELF::SHT_INIT_ARRAY;
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else if (SectionName == ".fini_array")
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Type = ELF::SHT_FINI_ARRAY;
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else if (SectionName == ".preinit_array")
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Type = ELF::SHT_PREINIT_ARRAY;
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if (TypeName == "init_array")
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Type = ELF::SHT_INIT_ARRAY;
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else if (TypeName == "fini_array")
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Type = ELF::SHT_FINI_ARRAY;
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else if (TypeName == "preinit_array")
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Type = ELF::SHT_PREINIT_ARRAY;
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else if (TypeName == "nobits")
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Type = ELF::SHT_NOBITS;
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else if (TypeName == "progbits")
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Type = ELF::SHT_PROGBITS;
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else if (TypeName == "note")
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Type = ELF::SHT_NOTE;
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else if (TypeName == "unwind")
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Type = ELF::SHT_X86_64_UNWIND;
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return TokError("unknown section type");
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MCSectionSubPair CurrentSection = getStreamer().getCurrentSection();
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if (const MCSectionELF *Section =
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cast_or_null<MCSectionELF>(CurrentSection.first))
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if (const MCSymbol *Group = Section->getGroup()) {
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GroupName = Group->getName();
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Flags |= ELF::SHF_GROUP;
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MCSection *ELFSection = getContext().getELFSection(SectionName, Type, Flags,
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Size, GroupName, UniqueID);
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getStreamer().SwitchSection(ELFSection, Subsection);
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if (getContext().getGenDwarfForAssembly()) {
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bool InsertResult = getContext().addGenDwarfSection(ELFSection);
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if (getContext().getDwarfVersion() <= 2)
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Warning(loc, "DWARF2 only supports one section per compilation unit");
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if (!ELFSection->getBeginSymbol()) {
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MCSymbol *SectionStartSymbol = getContext().createTempSymbol();
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getStreamer().EmitLabel(SectionStartSymbol);
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ELFSection->setBeginSymbol(SectionStartSymbol);
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bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
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MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
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if (PreviousSection.first == nullptr)
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return TokError(".previous without corresponding .section");
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getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
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static MCSymbolAttr MCAttrForString(StringRef Type) {
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return StringSwitch<MCSymbolAttr>(Type)
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.Cases("STT_FUNC", "function", MCSA_ELF_TypeFunction)
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.Cases("STT_OBJECT", "object", MCSA_ELF_TypeObject)
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.Cases("STT_TLS", "tls_object", MCSA_ELF_TypeTLS)
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.Cases("STT_COMMON", "common", MCSA_ELF_TypeCommon)
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.Cases("STT_NOTYPE", "notype", MCSA_ELF_TypeNoType)
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.Cases("STT_GNU_IFUNC", "gnu_indirect_function",
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MCSA_ELF_TypeIndFunction)
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.Case("gnu_unique_object", MCSA_ELF_TypeGnuUniqueObject)
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.Default(MCSA_Invalid);
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/// ParseDirectiveELFType
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/// ::= .type identifier , STT_<TYPE_IN_UPPER_CASE>
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/// ::= .type identifier , #attribute
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/// ::= .type identifier , @attribute
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/// ::= .type identifier , %attribute
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/// ::= .type identifier , "attribute"
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bool ELFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
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if (getParser().parseIdentifier(Name))
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return TokError("expected identifier in directive");
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// Handle the identifier as the key symbol.
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MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
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// NOTE the comma is optional in all cases. It is only documented as being
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// optional in the first case, however, GAS will silently treat the comma as
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// optional in all cases. Furthermore, although the documentation states that
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// the first form only accepts STT_<TYPE_IN_UPPER_CASE>, in reality, GAS
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// accepts both the upper case name as well as the lower case aliases.
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if (getLexer().is(AsmToken::Comma))
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if (getLexer().isNot(AsmToken::Identifier) &&
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getLexer().isNot(AsmToken::Hash) &&
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getLexer().isNot(AsmToken::Percent) &&
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getLexer().isNot(AsmToken::String)) {
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if (!getLexer().getAllowAtInIdentifier())
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return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', "
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"'%<type>' or \"<type>\"");
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else if (getLexer().isNot(AsmToken::At))
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return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', '@<type>', "
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"'%<type>' or \"<type>\"");
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if (getLexer().isNot(AsmToken::String) &&
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getLexer().isNot(AsmToken::Identifier))
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SMLoc TypeLoc = getLexer().getLoc();
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if (getParser().parseIdentifier(Type))
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return TokError("expected symbol type in directive");
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MCSymbolAttr Attr = MCAttrForString(Type);
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if (Attr == MCSA_Invalid)
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return Error(TypeLoc, "unsupported attribute in '.type' directive");
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in '.type' directive");
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getStreamer().EmitSymbolAttribute(Sym, Attr);
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/// ParseDirectiveIdent
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/// ::= .ident string
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bool ELFAsmParser::ParseDirectiveIdent(StringRef, SMLoc) {
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if (getLexer().isNot(AsmToken::String))
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return TokError("unexpected token in '.ident' directive");
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StringRef Data = getTok().getIdentifier();
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getStreamer().EmitIdent(Data);
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/// ParseDirectiveSymver
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/// ::= .symver foo, bar2@zed
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bool ELFAsmParser::ParseDirectiveSymver(StringRef, SMLoc) {
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if (getParser().parseIdentifier(Name))
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return TokError("expected identifier in directive");
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected a comma");
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// ARM assembly uses @ for a comment...
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// except when parsing the second parameter of the .symver directive.
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// Force the next symbol to allow @ in the identifier, which is
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// required for this directive and then reset it to its initial state.
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const bool AllowAtInIdentifier = getLexer().getAllowAtInIdentifier();
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getLexer().setAllowAtInIdentifier(true);
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getLexer().setAllowAtInIdentifier(AllowAtInIdentifier);
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if (getParser().parseIdentifier(AliasName))
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return TokError("expected identifier in directive");
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if (AliasName.find('@') == StringRef::npos)
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return TokError("expected a '@' in the name");
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MCSymbol *Alias = getContext().getOrCreateSymbol(AliasName);
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MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
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const MCExpr *Value = MCSymbolRefExpr::create(Sym, getContext());
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getStreamer().EmitAssignment(Alias, Value);
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/// ParseDirectiveVersion
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/// ::= .version string
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bool ELFAsmParser::ParseDirectiveVersion(StringRef, SMLoc) {
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if (getLexer().isNot(AsmToken::String))
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return TokError("unexpected token in '.version' directive");
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StringRef Data = getTok().getIdentifier();
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MCSection *Note = getContext().getELFSection(".note", ELF::SHT_NOTE, 0);
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getStreamer().PushSection();
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getStreamer().SwitchSection(Note);
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getStreamer().EmitIntValue(Data.size()+1, 4); // namesz.
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getStreamer().EmitIntValue(0, 4); // descsz = 0 (no description).
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getStreamer().EmitIntValue(1, 4); // type = NT_VERSION.
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getStreamer().EmitBytes(Data); // name.
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getStreamer().EmitIntValue(0, 1); // terminate the string.
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getStreamer().EmitValueToAlignment(4); // ensure 4 byte alignment.
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getStreamer().PopSection();
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/// ParseDirectiveWeakref
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/// ::= .weakref foo, bar
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bool ELFAsmParser::ParseDirectiveWeakref(StringRef, SMLoc) {
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// FIXME: Share code with the other alias building directives.
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if (getParser().parseIdentifier(AliasName))
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return TokError("expected identifier in directive");
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected a comma");
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if (getParser().parseIdentifier(Name))
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return TokError("expected identifier in directive");
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MCSymbol *Alias = getContext().getOrCreateSymbol(AliasName);
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MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
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getStreamer().EmitWeakReference(Alias, Sym);
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bool ELFAsmParser::ParseDirectiveSubsection(StringRef, SMLoc) {
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const MCExpr *Subsection = nullptr;
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if (getLexer().isNot(AsmToken::EndOfStatement)) {
731
if (getParser().parseExpression(Subsection))
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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getStreamer().SubSection(Subsection);
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MCAsmParserExtension *createELFAsmParser() {
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return new ELFAsmParser;