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https://github.com/c64scene-ar/llvm-6502.git
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d80781b98b
The ELF implementation now creates text, data and bss to match the gnu as behavior. The text streamer still has the old MachO specific behavior since the testsuite checks that it will error when a directive is given before a setting the current section for example. A nice benefit is that -n is not required anymore when producing ELF files. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114027 91177308-0d34-0410-b5e6-96231b3b80d8
277 lines
9.7 KiB
C++
277 lines
9.7 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::ParseDirectivePrevious>(".previous");
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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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bool ret = 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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getStreamer().EmitCodeAlignment(4, 0);
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return ret;
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}
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bool ParseSectionDirectiveText(StringRef, SMLoc) {
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bool ret = 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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getStreamer().EmitCodeAlignment(4, 0);
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return ret;
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}
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bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
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bool ret = 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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getStreamer().EmitCodeAlignment(4, 0);
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return ret;
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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 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::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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