584 lines
18 KiB
C++
584 lines
18 KiB
C++
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//===- ELFAsmParser.cpp - ELF Assembly Parser -----------------------------===//
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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/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/Support/ELF.h"
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using namespace llvm;
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namespace {
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class ELFAsmParser : public MCAsmParserExtension {
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template<bool (ELFAsmParser::*Handler)(StringRef, SMLoc)>
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void AddDirectiveHandler(StringRef Directive) {
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getParser().AddDirectiveHandler(this, Directive,
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HandleDirective<ELFAsmParser, Handler>);
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}
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bool ParseSectionSwitch(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind);
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bool SeenIdent;
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public:
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ELFAsmParser() : SeenIdent(false) {
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BracketExpressionsSupported = true;
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}
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virtual void Initialize(MCAsmParser &Parser) {
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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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AddDirectiveHandler<
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&ELFAsmParser::ParseSectionDirectiveDataRel>(".data.rel");
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AddDirectiveHandler<
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&ELFAsmParser::ParseSectionDirectiveDataRelRo>(".data.rel.ro");
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AddDirectiveHandler<
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&ELFAsmParser::ParseSectionDirectiveDataRelRoLocal>(".data.rel.ro.local");
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AddDirectiveHandler<
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&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
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AddDirectiveHandler<
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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::ParseDirectiveWeakref>(".weakref");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".local");
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AddDirectiveHandler<
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".protected");
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AddDirectiveHandler<
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".internal");
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AddDirectiveHandler<
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&ELFAsmParser::ParseDirectiveSymbolAttribute>(".hidden");
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}
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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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}
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bool ParseSectionDirectiveText(StringRef, SMLoc) {
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return ParseSectionSwitch(".text", ELF::SHT_PROGBITS,
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ELF::SHF_EXECINSTR |
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ELF::SHF_ALLOC, SectionKind::getText());
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}
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bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".bss", ELF::SHT_NOBITS,
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ELF::SHF_WRITE |
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ELF::SHF_ALLOC, SectionKind::getBSS());
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}
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bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
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return ParseSectionSwitch(".rodata", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC,
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SectionKind::getReadOnly());
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}
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bool ParseSectionDirectiveTData(StringRef, SMLoc) {
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return ParseSectionSwitch(".tdata", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_TLS | ELF::SHF_WRITE,
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SectionKind::getThreadData());
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}
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bool ParseSectionDirectiveTBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".tbss", ELF::SHT_NOBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_TLS | ELF::SHF_WRITE,
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SectionKind::getThreadBSS());
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}
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bool ParseSectionDirectiveDataRel(StringRef, SMLoc) {
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return ParseSectionSwitch(".data.rel", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_WRITE,
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SectionKind::getDataRel());
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}
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bool ParseSectionDirectiveDataRelRo(StringRef, SMLoc) {
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return ParseSectionSwitch(".data.rel.ro", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_WRITE,
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SectionKind::getReadOnlyWithRel());
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}
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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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ELF::SHF_ALLOC |
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ELF::SHF_WRITE,
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SectionKind::getReadOnlyWithRelLocal());
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}
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bool ParseSectionDirectiveEhFrame(StringRef, SMLoc) {
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return ParseSectionSwitch(".eh_frame", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_WRITE,
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SectionKind::getDataRel());
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}
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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 ParseDirectiveWeakref(StringRef, SMLoc);
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bool ParseDirectiveSymbolAttribute(StringRef, SMLoc);
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private:
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bool ParseSectionName(StringRef &SectionName);
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};
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}
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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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for (;;) {
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StringRef Name;
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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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break;
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in directive");
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Lex();
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}
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}
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Lex();
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return false;
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}
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bool ELFAsmParser::ParseSectionSwitch(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind) {
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in section switching directive");
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Lex();
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getStreamer().SwitchSection(getContext().getELFSection(
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Section, Type, Flags, Kind));
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return false;
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}
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bool ELFAsmParser::ParseDirectiveSize(StringRef, SMLoc) {
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StringRef Name;
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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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if (getLexer().isNot(AsmToken::Comma))
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return TokError("unexpected token in directive");
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Lex();
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const MCExpr *Expr;
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if (getParser().ParseExpression(Expr))
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return true;
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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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return false;
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}
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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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// ParseIdentifier.
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SMLoc FirstLoc = getLexer().getLoc();
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unsigned Size = 0;
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if (getLexer().is(AsmToken::String)) {
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SectionName = getTok().getIdentifier();
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Lex();
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return false;
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}
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for (;;) {
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StringRef Tmp;
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unsigned CurSize;
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SMLoc PrevLoc = getLexer().getLoc();
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if (getLexer().is(AsmToken::Minus)) {
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CurSize = 1;
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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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Lex();
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} else if (getLexer().is(AsmToken::Identifier)) {
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CurSize = getTok().getIdentifier().size();
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Lex();
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} else {
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break;
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}
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Size += CurSize;
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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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break;
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}
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if (Size == 0)
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return true;
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return false;
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}
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static SectionKind computeSectionKind(unsigned Flags) {
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if (Flags & ELF::SHF_EXECINSTR)
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return SectionKind::getText();
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if (Flags & ELF::SHF_TLS)
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return SectionKind::getThreadData();
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return SectionKind::getDataRel();
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}
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static int parseSectionFlags(StringRef flagsStr) {
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int flags = 0;
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for (unsigned i = 0; i < flagsStr.size(); i++) {
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switch (flagsStr[i]) {
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case 'a':
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flags |= ELF::SHF_ALLOC;
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break;
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case 'x':
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flags |= ELF::SHF_EXECINSTR;
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break;
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case 'w':
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flags |= ELF::SHF_WRITE;
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break;
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case 'M':
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flags |= ELF::SHF_MERGE;
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break;
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case 'S':
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flags |= ELF::SHF_STRINGS;
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break;
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case 'T':
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flags |= ELF::SHF_TLS;
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break;
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case 'c':
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flags |= ELF::XCORE_SHF_CP_SECTION;
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break;
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case 'd':
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flags |= ELF::XCORE_SHF_DP_SECTION;
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break;
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case 'G':
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flags |= ELF::SHF_GROUP;
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break;
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default:
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return -1;
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}
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}
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return flags;
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}
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bool ELFAsmParser::ParseDirectivePushSection(StringRef s, SMLoc loc) {
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getStreamer().PushSection();
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if (ParseDirectiveSection(s, loc)) {
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getStreamer().PopSection();
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return true;
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}
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return false;
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}
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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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return false;
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}
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// FIXME: This is a work in progress.
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bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
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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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StringRef TypeName;
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int64_t Size = 0;
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StringRef GroupName;
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unsigned Flags = 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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Lex();
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if (getLexer().isNot(AsmToken::String))
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return TokError("expected string in directive");
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StringRef FlagsStr = getTok().getStringContents();
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Lex();
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int extraFlags = parseSectionFlags(FlagsStr);
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if (extraFlags < 0)
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return TokError("unknown flag");
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Flags |= extraFlags;
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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 (getLexer().isNot(AsmToken::Comma)) {
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if (Mergeable)
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|
|
return TokError("Mergeable section must specify the type");
|
||
|
|
if (Group)
|
||
|
|
return TokError("Group section must specify the type");
|
||
|
|
} else {
|
||
|
|
Lex();
|
||
|
|
if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
|
||
|
|
return TokError("expected '@' or '%' before type");
|
||
|
|
|
||
|
|
Lex();
|
||
|
|
if (getParser().ParseIdentifier(TypeName))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
if (Mergeable) {
|
||
|
|
if (getLexer().isNot(AsmToken::Comma))
|
||
|
|
return TokError("expected the entry size");
|
||
|
|
Lex();
|
||
|
|
if (getParser().ParseAbsoluteExpression(Size))
|
||
|
|
return true;
|
||
|
|
if (Size <= 0)
|
||
|
|
return TokError("entry size must be positive");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Group) {
|
||
|
|
if (getLexer().isNot(AsmToken::Comma))
|
||
|
|
return TokError("expected group name");
|
||
|
|
Lex();
|
||
|
|
if (getParser().ParseIdentifier(GroupName))
|
||
|
|
return true;
|
||
|
|
if (getLexer().is(AsmToken::Comma)) {
|
||
|
|
Lex();
|
||
|
|
StringRef Linkage;
|
||
|
|
if (getParser().ParseIdentifier(Linkage))
|
||
|
|
return true;
|
||
|
|
if (Linkage != "comdat")
|
||
|
|
return TokError("Linkage must be 'comdat'");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
||
|
|
return TokError("unexpected token in directive");
|
||
|
|
|
||
|
|
unsigned Type = ELF::SHT_PROGBITS;
|
||
|
|
|
||
|
|
if (!TypeName.empty()) {
|
||
|
|
if (TypeName == "init_array")
|
||
|
|
Type = ELF::SHT_INIT_ARRAY;
|
||
|
|
else if (TypeName == "fini_array")
|
||
|
|
Type = ELF::SHT_FINI_ARRAY;
|
||
|
|
else if (TypeName == "preinit_array")
|
||
|
|
Type = ELF::SHT_PREINIT_ARRAY;
|
||
|
|
else if (TypeName == "nobits")
|
||
|
|
Type = ELF::SHT_NOBITS;
|
||
|
|
else if (TypeName == "progbits")
|
||
|
|
Type = ELF::SHT_PROGBITS;
|
||
|
|
else if (TypeName == "note")
|
||
|
|
Type = ELF::SHT_NOTE;
|
||
|
|
else if (TypeName == "unwind")
|
||
|
|
Type = ELF::SHT_X86_64_UNWIND;
|
||
|
|
else
|
||
|
|
return TokError("unknown section type");
|
||
|
|
}
|
||
|
|
|
||
|
|
SectionKind Kind = computeSectionKind(Flags);
|
||
|
|
getStreamer().SwitchSection(getContext().getELFSection(SectionName, Type,
|
||
|
|
Flags, Kind, Size,
|
||
|
|
GroupName));
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
|
||
|
|
const MCSection *PreviousSection = getStreamer().getPreviousSection();
|
||
|
|
if (PreviousSection == NULL)
|
||
|
|
return TokError(".previous without corresponding .section");
|
||
|
|
getStreamer().SwitchSection(PreviousSection);
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// ParseDirectiveELFType
|
||
|
|
/// ::= .type identifier , @attribute
|
||
|
|
bool ELFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
|
||
|
|
StringRef Name;
|
||
|
|
if (getParser().ParseIdentifier(Name))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
// Handle the identifier as the key symbol.
|
||
|
|
MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::Comma))
|
||
|
|
return TokError("unexpected token in '.type' directive");
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
|
||
|
|
return TokError("expected '@' or '%' before type");
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
StringRef Type;
|
||
|
|
SMLoc TypeLoc;
|
||
|
|
|
||
|
|
TypeLoc = getLexer().getLoc();
|
||
|
|
if (getParser().ParseIdentifier(Type))
|
||
|
|
return TokError("expected symbol type in directive");
|
||
|
|
|
||
|
|
MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Type)
|
||
|
|
.Case("function", MCSA_ELF_TypeFunction)
|
||
|
|
.Case("object", MCSA_ELF_TypeObject)
|
||
|
|
.Case("tls_object", MCSA_ELF_TypeTLS)
|
||
|
|
.Case("common", MCSA_ELF_TypeCommon)
|
||
|
|
.Case("notype", MCSA_ELF_TypeNoType)
|
||
|
|
.Case("gnu_unique_object", MCSA_ELF_TypeGnuUniqueObject)
|
||
|
|
.Case("gnu_indirect_function", MCSA_ELF_TypeIndFunction)
|
||
|
|
.Default(MCSA_Invalid);
|
||
|
|
|
||
|
|
if (Attr == MCSA_Invalid)
|
||
|
|
return Error(TypeLoc, "unsupported attribute in '.type' directive");
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
||
|
|
return TokError("unexpected token in '.type' directive");
|
||
|
|
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
getStreamer().EmitSymbolAttribute(Sym, Attr);
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// ParseDirectiveIdent
|
||
|
|
/// ::= .ident string
|
||
|
|
bool ELFAsmParser::ParseDirectiveIdent(StringRef, SMLoc) {
|
||
|
|
if (getLexer().isNot(AsmToken::String))
|
||
|
|
return TokError("unexpected token in '.ident' directive");
|
||
|
|
|
||
|
|
StringRef Data = getTok().getIdentifier();
|
||
|
|
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
const MCSection *Comment =
|
||
|
|
getContext().getELFSection(".comment", ELF::SHT_PROGBITS,
|
||
|
|
ELF::SHF_MERGE |
|
||
|
|
ELF::SHF_STRINGS,
|
||
|
|
SectionKind::getReadOnly(),
|
||
|
|
1, "");
|
||
|
|
|
||
|
|
getStreamer().PushSection();
|
||
|
|
getStreamer().SwitchSection(Comment);
|
||
|
|
if (!SeenIdent) {
|
||
|
|
getStreamer().EmitIntValue(0, 1);
|
||
|
|
SeenIdent = true;
|
||
|
|
}
|
||
|
|
getStreamer().EmitBytes(Data, 0);
|
||
|
|
getStreamer().EmitIntValue(0, 1);
|
||
|
|
getStreamer().PopSection();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// ParseDirectiveSymver
|
||
|
|
/// ::= .symver foo, bar2@zed
|
||
|
|
bool ELFAsmParser::ParseDirectiveSymver(StringRef, SMLoc) {
|
||
|
|
StringRef Name;
|
||
|
|
if (getParser().ParseIdentifier(Name))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::Comma))
|
||
|
|
return TokError("expected a comma");
|
||
|
|
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
StringRef AliasName;
|
||
|
|
if (getParser().ParseIdentifier(AliasName))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
if (AliasName.find('@') == StringRef::npos)
|
||
|
|
return TokError("expected a '@' in the name");
|
||
|
|
|
||
|
|
MCSymbol *Alias = getContext().GetOrCreateSymbol(AliasName);
|
||
|
|
MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
|
||
|
|
const MCExpr *Value = MCSymbolRefExpr::Create(Sym, getContext());
|
||
|
|
|
||
|
|
getStreamer().EmitAssignment(Alias, Value);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// ParseDirectiveWeakref
|
||
|
|
/// ::= .weakref foo, bar
|
||
|
|
bool ELFAsmParser::ParseDirectiveWeakref(StringRef, SMLoc) {
|
||
|
|
// FIXME: Share code with the other alias building directives.
|
||
|
|
|
||
|
|
StringRef AliasName;
|
||
|
|
if (getParser().ParseIdentifier(AliasName))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
if (getLexer().isNot(AsmToken::Comma))
|
||
|
|
return TokError("expected a comma");
|
||
|
|
|
||
|
|
Lex();
|
||
|
|
|
||
|
|
StringRef Name;
|
||
|
|
if (getParser().ParseIdentifier(Name))
|
||
|
|
return TokError("expected identifier in directive");
|
||
|
|
|
||
|
|
MCSymbol *Alias = getContext().GetOrCreateSymbol(AliasName);
|
||
|
|
|
||
|
|
MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
|
||
|
|
|
||
|
|
getStreamer().EmitWeakReference(Alias, Sym);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace llvm {
|
||
|
|
|
||
|
|
MCAsmParserExtension *createELFAsmParser() {
|
||
|
|
return new ELFAsmParser;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|