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https://github.com/c64scene-ar/llvm-6502.git
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f2a35fbd60
The .local, .hidden, .internal, and .protected are not legal for all supported file formats (in particular, they're invalid for MachO). Move the parsing for them into the ELF assembly parser since that's the format they're for. Similarly, .weak is used by COFF and ELF, but not MachO, so move the parsing to the COFF and ELF asm parsers. Previously, using any of these directives on Darwin would result in an assertion failure in the parser; now we get a diagnostic as we should. rdar://9827089 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135921 91177308-0d34-0410-b5e6-96231b3b80d8
583 lines
18 KiB
C++
583 lines
18 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/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");
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if (Group)
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return TokError("Group section must specify the type");
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} else {
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Lex();
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if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
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return TokError("expected '@' or '%' before type");
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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 (Mergeable) {
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected the entry size");
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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("entry size must be positive");
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}
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if (Group) {
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if (getLexer().isNot(AsmToken::Comma))
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return TokError("expected group name");
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Lex();
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if (getParser().ParseIdentifier(GroupName))
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return true;
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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StringRef Linkage;
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if (getParser().ParseIdentifier(Linkage))
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return true;
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if (Linkage != "comdat")
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return TokError("Linkage must be 'comdat'");
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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 Type = ELF::SHT_PROGBITS;
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if (!TypeName.empty()) {
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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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else
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return TokError("unknown section type");
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}
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SectionKind Kind = computeSectionKind(Flags);
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getStreamer().SwitchSection(getContext().getELFSection(SectionName, Type,
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Flags, Kind, Size,
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GroupName));
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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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return TokError(".previous without corresponding .section");
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getStreamer().SwitchSection(PreviousSection);
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return false;
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}
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/// ParseDirectiveELFType
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/// ::= .type identifier , @attribute
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bool ELFAsmParser::ParseDirectiveType(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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// Handle the identifier as the key symbol.
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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 '.type' directive");
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Lex();
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if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
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return TokError("expected '@' or '%' before type");
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Lex();
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StringRef Type;
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SMLoc TypeLoc;
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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 = StringSwitch<MCSymbolAttr>(Type)
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.Case("function", MCSA_ELF_TypeFunction)
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.Case("object", MCSA_ELF_TypeObject)
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.Case("tls_object", MCSA_ELF_TypeTLS)
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.Case("common", MCSA_ELF_TypeCommon)
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.Case("notype", MCSA_ELF_TypeNoType)
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.Case("gnu_unique_object", MCSA_ELF_TypeGnuUniqueObject)
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.Default(MCSA_Invalid);
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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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Lex();
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getStreamer().EmitSymbolAttribute(Sym, Attr);
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return false;
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}
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/// ParseDirectiveIdent
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/// ::= .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;
|
|
}
|
|
|
|
}
|