292 lines
10 KiB
C++
292 lines
10 KiB
C++
//===- 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/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/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/ADT/Twine.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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public:
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ELFAsmParser() {}
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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<&ELFAsmParser::ParseSectionDirectiveDataRel>(".data.rel");
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AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveDataRelRo>(".data.rel.ro");
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AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveDataRelRoLocal>(".data.rel.ro.local");
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AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSize>(".size");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveLEB128>(".sleb128");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectiveLEB128>(".uleb128");
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AddDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
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}
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bool ParseSectionDirectiveData(StringRef, SMLoc) {
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return ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_WRITE |MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_EXECINSTR |
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MCSectionELF::SHF_ALLOC, SectionKind::getText());
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}
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bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
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return ParseSectionSwitch(".bss", MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_WRITE |
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MCSectionELF::SHF_ALLOC, SectionKind::getBSS());
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}
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bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
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return ParseSectionSwitch(".rodata", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::SHF_TLS | MCSectionELF::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", MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::SHF_TLS | MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::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", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC |
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MCSectionELF::SHF_WRITE,
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SectionKind::getDataRel());
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}
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bool ParseDirectiveLEB128(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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};
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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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// 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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// FIXME: This doesn't parse section names like ".note.GNU-stack" correctly.
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if (getParser().ParseIdentifier(SectionName))
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return TokError("expected identifier in directive");
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std::string FlagsStr;
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StringRef TypeName;
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int64_t Size = 0;
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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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FlagsStr = getTok().getStringContents();
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Lex();
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AsmToken::TokenKind TypeStartToken;
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if (getContext().getAsmInfo().getCommentString()[0] == '@')
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TypeStartToken = AsmToken::Percent;
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else
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TypeStartToken = AsmToken::At;
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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if (getLexer().is(TypeStartToken)) {
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Lex();
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if (getParser().ParseIdentifier(TypeName))
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return TokError("expected identifier in directive");
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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if (getParser().ParseAbsoluteExpression(Size))
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return true;
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if (Size <= 0)
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return TokError("section size must be positive");
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}
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}
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}
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}
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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unsigned 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 |= MCSectionELF::SHF_ALLOC;
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break;
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case 'x':
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Flags |= MCSectionELF::SHF_EXECINSTR;
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break;
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case 'w':
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Flags |= MCSectionELF::SHF_WRITE;
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break;
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case 'M':
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Flags |= MCSectionELF::SHF_MERGE;
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break;
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case 'S':
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Flags |= MCSectionELF::SHF_STRINGS;
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break;
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case 'T':
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Flags |= MCSectionELF::SHF_TLS;
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break;
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case 'c':
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Flags |= MCSectionELF::XCORE_SHF_CP_SECTION;
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break;
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case 'd':
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Flags |= MCSectionELF::XCORE_SHF_DP_SECTION;
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break;
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default:
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return TokError("unknown flag");
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}
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}
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unsigned Type = MCSectionELF::SHT_NULL;
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if (!TypeName.empty()) {
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if (TypeName == "init_array")
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Type = MCSectionELF::SHT_INIT_ARRAY;
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else if (TypeName == "fini_array")
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Type = MCSectionELF::SHT_FINI_ARRAY;
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else if (TypeName == "preinit_array")
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Type = MCSectionELF::SHT_PREINIT_ARRAY;
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else if (TypeName == "nobits")
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Type = MCSectionELF::SHT_NOBITS;
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else if (TypeName == "progbits")
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Type = MCSectionELF::SHT_PROGBITS;
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else
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return TokError("unknown section type");
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}
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SectionKind Kind = (Flags & MCSectionELF::SHF_EXECINSTR)
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? SectionKind::getText()
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: SectionKind::getDataRel();
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getStreamer().SwitchSection(getContext().getELFSection(SectionName, Type,
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Flags, Kind, false));
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return false;
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}
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bool ELFAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
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int64_t Value;
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if (getParser().ParseAbsoluteExpression(Value))
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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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// FIXME: Add proper MC support.
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if (getContext().getAsmInfo().hasLEB128()) {
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if (DirName[1] == 's')
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getStreamer().EmitRawText("\t.sleb128\t" + Twine(Value));
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else
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getStreamer().EmitRawText("\t.uleb128\t" + Twine(Value));
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return false;
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}
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// FIXME: This shouldn't be an error!
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return TokError("LEB128 not supported yet");
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}
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bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
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const MCSection *PreviousSection = getStreamer().getPreviousSection();
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if (PreviousSection != NULL)
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getStreamer().SwitchSection(PreviousSection);
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return false;
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}
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namespace llvm {
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MCAsmParserExtension *createELFAsmParser() {
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return new ELFAsmParser;
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}
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}
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