You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
886 lines
29 KiB
886 lines
29 KiB
//===- ELFAsmParser.cpp - ELF Assembly Parser -----------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/ADT/StringSwitch.h"
|
|
#include "llvm/BinaryFormat/ELF.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCDirectives.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCParser/MCAsmLexer.h"
|
|
#include "llvm/MC/MCParser/MCAsmParser.h"
|
|
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MCSymbolELF.h"
|
|
#include "llvm/MC/SectionKind.h"
|
|
#include "llvm/Support/Casting.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
#include "llvm/Support/SMLoc.h"
|
|
#include <cassert>
|
|
#include <cstdint>
|
|
#include <utility>
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
class ELFAsmParser : public MCAsmParserExtension {
|
|
template<bool (ELFAsmParser::*HandlerMethod)(StringRef, SMLoc)>
|
|
void addDirectiveHandler(StringRef Directive) {
|
|
MCAsmParser::ExtensionDirectiveHandler Handler = std::make_pair(
|
|
this, HandleDirective<ELFAsmParser, HandlerMethod>);
|
|
|
|
getParser().addDirectiveHandler(Directive, Handler);
|
|
}
|
|
|
|
bool ParseSectionSwitch(StringRef Section, unsigned Type, unsigned Flags,
|
|
SectionKind Kind);
|
|
|
|
public:
|
|
ELFAsmParser() { BracketExpressionsSupported = true; }
|
|
|
|
void Initialize(MCAsmParser &Parser) override {
|
|
// Call the base implementation.
|
|
this->MCAsmParserExtension::Initialize(Parser);
|
|
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveData>(".data");
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveText>(".text");
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveBSS>(".bss");
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveRoData>(".rodata");
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveTData>(".tdata");
|
|
addDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveTBSS>(".tbss");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseSectionDirectiveDataRel>(".data.rel");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseSectionDirectiveDataRelRo>(".data.rel.ro");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseDirectivePushSection>(".pushsection");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectivePopSection>(".popsection");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSize>(".size");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveIdent>(".ident");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymver>(".symver");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveVersion>(".version");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveWeakref>(".weakref");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".local");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseDirectiveSymbolAttribute>(".protected");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseDirectiveSymbolAttribute>(".internal");
|
|
addDirectiveHandler<
|
|
&ELFAsmParser::ParseDirectiveSymbolAttribute>(".hidden");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveSubsection>(".subsection");
|
|
addDirectiveHandler<&ELFAsmParser::ParseDirectiveCGProfile>(".cg_profile");
|
|
}
|
|
|
|
// FIXME: Part of this logic is duplicated in the MCELFStreamer. What is
|
|
// the best way for us to get access to it?
|
|
bool ParseSectionDirectiveData(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".data", ELF::SHT_PROGBITS,
|
|
ELF::SHF_WRITE | ELF::SHF_ALLOC,
|
|
SectionKind::getData());
|
|
}
|
|
bool ParseSectionDirectiveText(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".text", ELF::SHT_PROGBITS,
|
|
ELF::SHF_EXECINSTR |
|
|
ELF::SHF_ALLOC, SectionKind::getText());
|
|
}
|
|
bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".bss", ELF::SHT_NOBITS,
|
|
ELF::SHF_WRITE |
|
|
ELF::SHF_ALLOC, SectionKind::getBSS());
|
|
}
|
|
bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".rodata", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getReadOnly());
|
|
}
|
|
bool ParseSectionDirectiveTData(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".tdata", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |
|
|
ELF::SHF_TLS | ELF::SHF_WRITE,
|
|
SectionKind::getThreadData());
|
|
}
|
|
bool ParseSectionDirectiveTBSS(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".tbss", ELF::SHT_NOBITS,
|
|
ELF::SHF_ALLOC |
|
|
ELF::SHF_TLS | ELF::SHF_WRITE,
|
|
SectionKind::getThreadBSS());
|
|
}
|
|
bool ParseSectionDirectiveDataRel(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".data.rel", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC | ELF::SHF_WRITE,
|
|
SectionKind::getData());
|
|
}
|
|
bool ParseSectionDirectiveDataRelRo(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".data.rel.ro", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |
|
|
ELF::SHF_WRITE,
|
|
SectionKind::getReadOnlyWithRel());
|
|
}
|
|
bool ParseSectionDirectiveEhFrame(StringRef, SMLoc) {
|
|
return ParseSectionSwitch(".eh_frame", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC | ELF::SHF_WRITE,
|
|
SectionKind::getData());
|
|
}
|
|
bool ParseDirectivePushSection(StringRef, SMLoc);
|
|
bool ParseDirectivePopSection(StringRef, SMLoc);
|
|
bool ParseDirectiveSection(StringRef, SMLoc);
|
|
bool ParseDirectiveSize(StringRef, SMLoc);
|
|
bool ParseDirectivePrevious(StringRef, SMLoc);
|
|
bool ParseDirectiveType(StringRef, SMLoc);
|
|
bool ParseDirectiveIdent(StringRef, SMLoc);
|
|
bool ParseDirectiveSymver(StringRef, SMLoc);
|
|
bool ParseDirectiveVersion(StringRef, SMLoc);
|
|
bool ParseDirectiveWeakref(StringRef, SMLoc);
|
|
bool ParseDirectiveSymbolAttribute(StringRef, SMLoc);
|
|
bool ParseDirectiveSubsection(StringRef, SMLoc);
|
|
bool ParseDirectiveCGProfile(StringRef, SMLoc);
|
|
|
|
private:
|
|
bool ParseSectionName(StringRef &SectionName);
|
|
bool ParseSectionArguments(bool IsPush, SMLoc loc);
|
|
unsigned parseSunStyleSectionFlags();
|
|
bool maybeParseSectionType(StringRef &TypeName);
|
|
bool parseMergeSize(int64_t &Size);
|
|
bool parseGroup(StringRef &GroupName);
|
|
bool parseLinkedToSym(MCSymbolELF *&LinkedToSym);
|
|
bool maybeParseUniqueID(int64_t &UniqueID);
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
/// ParseDirectiveSymbolAttribute
|
|
/// ::= { ".local", ".weak", ... } [ identifier ( , identifier )* ]
|
|
bool ELFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
|
|
MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Directive)
|
|
.Case(".weak", MCSA_Weak)
|
|
.Case(".local", MCSA_Local)
|
|
.Case(".hidden", MCSA_Hidden)
|
|
.Case(".internal", MCSA_Internal)
|
|
.Case(".protected", MCSA_Protected)
|
|
.Default(MCSA_Invalid);
|
|
assert(Attr != MCSA_Invalid && "unexpected symbol attribute directive!");
|
|
if (getLexer().isNot(AsmToken::EndOfStatement)) {
|
|
while (true) {
|
|
StringRef Name;
|
|
|
|
if (getParser().parseIdentifier(Name))
|
|
return TokError("expected identifier in directive");
|
|
|
|
MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
|
|
|
|
getStreamer().emitSymbolAttribute(Sym, Attr);
|
|
|
|
if (getLexer().is(AsmToken::EndOfStatement))
|
|
break;
|
|
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lex();
|
|
}
|
|
}
|
|
|
|
Lex();
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseSectionSwitch(StringRef Section, unsigned Type,
|
|
unsigned Flags, SectionKind Kind) {
|
|
const MCExpr *Subsection = nullptr;
|
|
if (getLexer().isNot(AsmToken::EndOfStatement)) {
|
|
if (getParser().parseExpression(Subsection))
|
|
return true;
|
|
}
|
|
Lex();
|
|
|
|
getStreamer().SwitchSection(getContext().getELFSection(Section, Type, Flags),
|
|
Subsection);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectiveSize(StringRef, SMLoc) {
|
|
StringRef Name;
|
|
if (getParser().parseIdentifier(Name))
|
|
return TokError("expected identifier in directive");
|
|
MCSymbolELF *Sym = cast<MCSymbolELF>(getContext().getOrCreateSymbol(Name));
|
|
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
return TokError("unexpected token in directive");
|
|
Lex();
|
|
|
|
const MCExpr *Expr;
|
|
if (getParser().parseExpression(Expr))
|
|
return true;
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
Lex();
|
|
|
|
getStreamer().emitELFSize(Sym, Expr);
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseSectionName(StringRef &SectionName) {
|
|
// A section name can contain -, so we cannot just use
|
|
// parseIdentifier.
|
|
SMLoc FirstLoc = getLexer().getLoc();
|
|
unsigned Size = 0;
|
|
|
|
if (getLexer().is(AsmToken::String)) {
|
|
SectionName = getTok().getIdentifier();
|
|
Lex();
|
|
return false;
|
|
}
|
|
|
|
while (!getParser().hasPendingError()) {
|
|
SMLoc PrevLoc = getLexer().getLoc();
|
|
if (getLexer().is(AsmToken::Comma) ||
|
|
getLexer().is(AsmToken::EndOfStatement))
|
|
break;
|
|
|
|
unsigned CurSize;
|
|
if (getLexer().is(AsmToken::String)) {
|
|
CurSize = getTok().getIdentifier().size() + 2;
|
|
Lex();
|
|
} else if (getLexer().is(AsmToken::Identifier)) {
|
|
CurSize = getTok().getIdentifier().size();
|
|
Lex();
|
|
} else {
|
|
CurSize = getTok().getString().size();
|
|
Lex();
|
|
}
|
|
Size += CurSize;
|
|
SectionName = StringRef(FirstLoc.getPointer(), Size);
|
|
|
|
// Make sure the following token is adjacent.
|
|
if (PrevLoc.getPointer() + CurSize != getTok().getLoc().getPointer())
|
|
break;
|
|
}
|
|
if (Size == 0)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static unsigned parseSectionFlags(StringRef flagsStr, bool *UseLastGroup) {
|
|
unsigned flags = 0;
|
|
|
|
// If a valid numerical value is set for the section flag, use it verbatim
|
|
if (!flagsStr.getAsInteger(0, flags))
|
|
return flags;
|
|
|
|
for (char i : flagsStr) {
|
|
switch (i) {
|
|
case 'a':
|
|
flags |= ELF::SHF_ALLOC;
|
|
break;
|
|
case 'e':
|
|
flags |= ELF::SHF_EXCLUDE;
|
|
break;
|
|
case 'x':
|
|
flags |= ELF::SHF_EXECINSTR;
|
|
break;
|
|
case 'w':
|
|
flags |= ELF::SHF_WRITE;
|
|
break;
|
|
case 'o':
|
|
flags |= ELF::SHF_LINK_ORDER;
|
|
break;
|
|
case 'M':
|
|
flags |= ELF::SHF_MERGE;
|
|
break;
|
|
case 'S':
|
|
flags |= ELF::SHF_STRINGS;
|
|
break;
|
|
case 'T':
|
|
flags |= ELF::SHF_TLS;
|
|
break;
|
|
case 'c':
|
|
flags |= ELF::XCORE_SHF_CP_SECTION;
|
|
break;
|
|
case 'd':
|
|
flags |= ELF::XCORE_SHF_DP_SECTION;
|
|
break;
|
|
case 'y':
|
|
flags |= ELF::SHF_ARM_PURECODE;
|
|
break;
|
|
case 's':
|
|
flags |= ELF::SHF_HEX_GPREL;
|
|
break;
|
|
case 'G':
|
|
flags |= ELF::SHF_GROUP;
|
|
break;
|
|
case '?':
|
|
*UseLastGroup = true;
|
|
break;
|
|
default:
|
|
return -1U;
|
|
}
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
unsigned ELFAsmParser::parseSunStyleSectionFlags() {
|
|
unsigned flags = 0;
|
|
while (getLexer().is(AsmToken::Hash)) {
|
|
Lex(); // Eat the #.
|
|
|
|
if (!getLexer().is(AsmToken::Identifier))
|
|
return -1U;
|
|
|
|
StringRef flagId = getTok().getIdentifier();
|
|
if (flagId == "alloc")
|
|
flags |= ELF::SHF_ALLOC;
|
|
else if (flagId == "execinstr")
|
|
flags |= ELF::SHF_EXECINSTR;
|
|
else if (flagId == "write")
|
|
flags |= ELF::SHF_WRITE;
|
|
else if (flagId == "tls")
|
|
flags |= ELF::SHF_TLS;
|
|
else
|
|
return -1U;
|
|
|
|
Lex(); // Eat the flag.
|
|
|
|
if (!getLexer().is(AsmToken::Comma))
|
|
break;
|
|
Lex(); // Eat the comma.
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
|
|
bool ELFAsmParser::ParseDirectivePushSection(StringRef s, SMLoc loc) {
|
|
getStreamer().PushSection();
|
|
|
|
if (ParseSectionArguments(/*IsPush=*/true, loc)) {
|
|
getStreamer().PopSection();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectivePopSection(StringRef, SMLoc) {
|
|
if (!getStreamer().PopSection())
|
|
return TokError(".popsection without corresponding .pushsection");
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc loc) {
|
|
return ParseSectionArguments(/*IsPush=*/false, loc);
|
|
}
|
|
|
|
bool ELFAsmParser::maybeParseSectionType(StringRef &TypeName) {
|
|
MCAsmLexer &L = getLexer();
|
|
if (L.isNot(AsmToken::Comma))
|
|
return false;
|
|
Lex();
|
|
if (L.isNot(AsmToken::At) && L.isNot(AsmToken::Percent) &&
|
|
L.isNot(AsmToken::String)) {
|
|
if (L.getAllowAtInIdentifier())
|
|
return TokError("expected '@<type>', '%<type>' or \"<type>\"");
|
|
else
|
|
return TokError("expected '%<type>' or \"<type>\"");
|
|
}
|
|
if (!L.is(AsmToken::String))
|
|
Lex();
|
|
if (L.is(AsmToken::Integer)) {
|
|
TypeName = getTok().getString();
|
|
Lex();
|
|
} else if (getParser().parseIdentifier(TypeName))
|
|
return TokError("expected identifier in directive");
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::parseMergeSize(int64_t &Size) {
|
|
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");
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::parseGroup(StringRef &GroupName) {
|
|
MCAsmLexer &L = getLexer();
|
|
if (L.isNot(AsmToken::Comma))
|
|
return TokError("expected group name");
|
|
Lex();
|
|
if (L.is(AsmToken::Integer)) {
|
|
GroupName = getTok().getString();
|
|
Lex();
|
|
} else if (getParser().parseIdentifier(GroupName)) {
|
|
return TokError("invalid group name");
|
|
}
|
|
if (L.is(AsmToken::Comma)) {
|
|
Lex();
|
|
StringRef Linkage;
|
|
if (getParser().parseIdentifier(Linkage))
|
|
return TokError("invalid linkage");
|
|
if (Linkage != "comdat")
|
|
return TokError("Linkage must be 'comdat'");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::parseLinkedToSym(MCSymbolELF *&LinkedToSym) {
|
|
MCAsmLexer &L = getLexer();
|
|
if (L.isNot(AsmToken::Comma))
|
|
return TokError("expected linked-to symbol");
|
|
Lex();
|
|
StringRef Name;
|
|
SMLoc StartLoc = L.getLoc();
|
|
if (getParser().parseIdentifier(Name)) {
|
|
if (getParser().getTok().getString() == "0") {
|
|
getParser().Lex();
|
|
LinkedToSym = nullptr;
|
|
return false;
|
|
}
|
|
return TokError("invalid linked-to symbol");
|
|
}
|
|
LinkedToSym = dyn_cast_or_null<MCSymbolELF>(getContext().lookupSymbol(Name));
|
|
if (!LinkedToSym || !LinkedToSym->isInSection())
|
|
return Error(StartLoc, "linked-to symbol is not in a section: " + Name);
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::maybeParseUniqueID(int64_t &UniqueID) {
|
|
MCAsmLexer &L = getLexer();
|
|
if (L.isNot(AsmToken::Comma))
|
|
return false;
|
|
Lex();
|
|
StringRef UniqueStr;
|
|
if (getParser().parseIdentifier(UniqueStr))
|
|
return TokError("expected identifier in directive");
|
|
if (UniqueStr != "unique")
|
|
return TokError("expected 'unique'");
|
|
if (L.isNot(AsmToken::Comma))
|
|
return TokError("expected commma");
|
|
Lex();
|
|
if (getParser().parseAbsoluteExpression(UniqueID))
|
|
return true;
|
|
if (UniqueID < 0)
|
|
return TokError("unique id must be positive");
|
|
if (!isUInt<32>(UniqueID) || UniqueID == ~0U)
|
|
return TokError("unique id is too large");
|
|
return false;
|
|
}
|
|
|
|
static bool hasPrefix(StringRef SectionName, StringRef Prefix) {
|
|
return SectionName.startswith(Prefix) || SectionName == Prefix.drop_back();
|
|
}
|
|
|
|
bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
|
|
StringRef SectionName;
|
|
|
|
if (ParseSectionName(SectionName))
|
|
return TokError("expected identifier in directive");
|
|
|
|
StringRef TypeName;
|
|
int64_t Size = 0;
|
|
StringRef GroupName;
|
|
unsigned Flags = 0;
|
|
const MCExpr *Subsection = nullptr;
|
|
bool UseLastGroup = false;
|
|
MCSymbolELF *LinkedToSym = nullptr;
|
|
int64_t UniqueID = ~0;
|
|
|
|
// Set the defaults first.
|
|
if (hasPrefix(SectionName, ".rodata.") || SectionName == ".rodata1")
|
|
Flags |= ELF::SHF_ALLOC;
|
|
else if (SectionName == ".fini" || SectionName == ".init" ||
|
|
hasPrefix(SectionName, ".text."))
|
|
Flags |= ELF::SHF_ALLOC | ELF::SHF_EXECINSTR;
|
|
else if (hasPrefix(SectionName, ".data.") || SectionName == ".data1" ||
|
|
hasPrefix(SectionName, ".bss.") ||
|
|
hasPrefix(SectionName, ".init_array.") ||
|
|
hasPrefix(SectionName, ".fini_array.") ||
|
|
hasPrefix(SectionName, ".preinit_array."))
|
|
Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE;
|
|
else if (hasPrefix(SectionName, ".tdata.") ||
|
|
hasPrefix(SectionName, ".tbss."))
|
|
Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_TLS;
|
|
|
|
if (getLexer().is(AsmToken::Comma)) {
|
|
Lex();
|
|
|
|
if (IsPush && getLexer().isNot(AsmToken::String)) {
|
|
if (getParser().parseExpression(Subsection))
|
|
return true;
|
|
if (getLexer().isNot(AsmToken::Comma))
|
|
goto EndStmt;
|
|
Lex();
|
|
}
|
|
|
|
unsigned extraFlags;
|
|
|
|
if (getLexer().isNot(AsmToken::String)) {
|
|
if (!getContext().getAsmInfo()->usesSunStyleELFSectionSwitchSyntax()
|
|
|| getLexer().isNot(AsmToken::Hash))
|
|
return TokError("expected string in directive");
|
|
extraFlags = parseSunStyleSectionFlags();
|
|
} else {
|
|
StringRef FlagsStr = getTok().getStringContents();
|
|
Lex();
|
|
extraFlags = parseSectionFlags(FlagsStr, &UseLastGroup);
|
|
}
|
|
|
|
if (extraFlags == -1U)
|
|
return TokError("unknown flag");
|
|
Flags |= extraFlags;
|
|
|
|
bool Mergeable = Flags & ELF::SHF_MERGE;
|
|
bool Group = Flags & ELF::SHF_GROUP;
|
|
if (Group && UseLastGroup)
|
|
return TokError("Section cannot specifiy a group name while also acting "
|
|
"as a member of the last group");
|
|
|
|
if (maybeParseSectionType(TypeName))
|
|
return true;
|
|
|
|
MCAsmLexer &L = getLexer();
|
|
if (TypeName.empty()) {
|
|
if (Mergeable)
|
|
return TokError("Mergeable section must specify the type");
|
|
if (Group)
|
|
return TokError("Group section must specify the type");
|
|
if (L.isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
}
|
|
|
|
if (Mergeable)
|
|
if (parseMergeSize(Size))
|
|
return true;
|
|
if (Group)
|
|
if (parseGroup(GroupName))
|
|
return true;
|
|
if (Flags & ELF::SHF_LINK_ORDER)
|
|
if (parseLinkedToSym(LinkedToSym))
|
|
return true;
|
|
if (maybeParseUniqueID(UniqueID))
|
|
return true;
|
|
}
|
|
|
|
EndStmt:
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
Lex();
|
|
|
|
unsigned Type = ELF::SHT_PROGBITS;
|
|
|
|
if (TypeName.empty()) {
|
|
if (SectionName.startswith(".note"))
|
|
Type = ELF::SHT_NOTE;
|
|
else if (hasPrefix(SectionName, ".init_array."))
|
|
Type = ELF::SHT_INIT_ARRAY;
|
|
else if (hasPrefix(SectionName, ".bss."))
|
|
Type = ELF::SHT_NOBITS;
|
|
else if (hasPrefix(SectionName, ".tbss."))
|
|
Type = ELF::SHT_NOBITS;
|
|
else if (hasPrefix(SectionName, ".fini_array."))
|
|
Type = ELF::SHT_FINI_ARRAY;
|
|
else if (hasPrefix(SectionName, ".preinit_array."))
|
|
Type = ELF::SHT_PREINIT_ARRAY;
|
|
} else {
|
|
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 if (TypeName == "llvm_odrtab")
|
|
Type = ELF::SHT_LLVM_ODRTAB;
|
|
else if (TypeName == "llvm_linker_options")
|
|
Type = ELF::SHT_LLVM_LINKER_OPTIONS;
|
|
else if (TypeName == "llvm_call_graph_profile")
|
|
Type = ELF::SHT_LLVM_CALL_GRAPH_PROFILE;
|
|
else if (TypeName == "llvm_dependent_libraries")
|
|
Type = ELF::SHT_LLVM_DEPENDENT_LIBRARIES;
|
|
else if (TypeName == "llvm_sympart")
|
|
Type = ELF::SHT_LLVM_SYMPART;
|
|
else if (TypeName == "llvm_bb_addr_map")
|
|
Type = ELF::SHT_LLVM_BB_ADDR_MAP;
|
|
else if (TypeName.getAsInteger(0, Type))
|
|
return TokError("unknown section type");
|
|
}
|
|
|
|
if (UseLastGroup) {
|
|
MCSectionSubPair CurrentSection = getStreamer().getCurrentSection();
|
|
if (const MCSectionELF *Section =
|
|
cast_or_null<MCSectionELF>(CurrentSection.first))
|
|
if (const MCSymbol *Group = Section->getGroup()) {
|
|
GroupName = Group->getName();
|
|
Flags |= ELF::SHF_GROUP;
|
|
}
|
|
}
|
|
|
|
MCSectionELF *Section = getContext().getELFSection(
|
|
SectionName, Type, Flags, Size, GroupName, UniqueID, LinkedToSym);
|
|
getStreamer().SwitchSection(Section, Subsection);
|
|
// x86-64 psABI names SHT_X86_64_UNWIND as the canonical type for .eh_frame,
|
|
// but GNU as emits SHT_PROGBITS .eh_frame for .cfi_* directives. Don't error
|
|
// for SHT_PROGBITS .eh_frame
|
|
if (Section->getType() != Type &&
|
|
!(SectionName == ".eh_frame" && Type == ELF::SHT_PROGBITS))
|
|
Error(loc, "changed section type for " + SectionName + ", expected: 0x" +
|
|
utohexstr(Section->getType()));
|
|
if (Section->getFlags() != Flags)
|
|
Error(loc, "changed section flags for " + SectionName + ", expected: 0x" +
|
|
utohexstr(Section->getFlags()));
|
|
if (Section->getEntrySize() != Size)
|
|
Error(loc, "changed section entsize for " + SectionName +
|
|
", expected: " + Twine(Section->getEntrySize()));
|
|
|
|
if (getContext().getGenDwarfForAssembly() &&
|
|
(Section->getFlags() & ELF::SHF_ALLOC) &&
|
|
(Section->getFlags() & ELF::SHF_EXECINSTR)) {
|
|
bool InsertResult = getContext().addGenDwarfSection(Section);
|
|
if (InsertResult) {
|
|
if (getContext().getDwarfVersion() <= 2)
|
|
Warning(loc, "DWARF2 only supports one section per compilation unit");
|
|
|
|
if (!Section->getBeginSymbol()) {
|
|
MCSymbol *SectionStartSymbol = getContext().createTempSymbol();
|
|
getStreamer().emitLabel(SectionStartSymbol);
|
|
Section->setBeginSymbol(SectionStartSymbol);
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
|
|
MCSectionSubPair PreviousSection = getStreamer().getPreviousSection();
|
|
if (PreviousSection.first == nullptr)
|
|
return TokError(".previous without corresponding .section");
|
|
getStreamer().SwitchSection(PreviousSection.first, PreviousSection.second);
|
|
|
|
return false;
|
|
}
|
|
|
|
static MCSymbolAttr MCAttrForString(StringRef Type) {
|
|
return StringSwitch<MCSymbolAttr>(Type)
|
|
.Cases("STT_FUNC", "function", MCSA_ELF_TypeFunction)
|
|
.Cases("STT_OBJECT", "object", MCSA_ELF_TypeObject)
|
|
.Cases("STT_TLS", "tls_object", MCSA_ELF_TypeTLS)
|
|
.Cases("STT_COMMON", "common", MCSA_ELF_TypeCommon)
|
|
.Cases("STT_NOTYPE", "notype", MCSA_ELF_TypeNoType)
|
|
.Cases("STT_GNU_IFUNC", "gnu_indirect_function",
|
|
MCSA_ELF_TypeIndFunction)
|
|
.Case("gnu_unique_object", MCSA_ELF_TypeGnuUniqueObject)
|
|
.Default(MCSA_Invalid);
|
|
}
|
|
|
|
/// ParseDirectiveELFType
|
|
/// ::= .type identifier , STT_<TYPE_IN_UPPER_CASE>
|
|
/// ::= .type identifier , #attribute
|
|
/// ::= .type identifier , @attribute
|
|
/// ::= .type identifier , %attribute
|
|
/// ::= .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);
|
|
|
|
// NOTE the comma is optional in all cases. It is only documented as being
|
|
// optional in the first case, however, GAS will silently treat the comma as
|
|
// optional in all cases. Furthermore, although the documentation states that
|
|
// the first form only accepts STT_<TYPE_IN_UPPER_CASE>, in reality, GAS
|
|
// accepts both the upper case name as well as the lower case aliases.
|
|
if (getLexer().is(AsmToken::Comma))
|
|
Lex();
|
|
|
|
if (getLexer().isNot(AsmToken::Identifier) &&
|
|
getLexer().isNot(AsmToken::Hash) &&
|
|
getLexer().isNot(AsmToken::Percent) &&
|
|
getLexer().isNot(AsmToken::String)) {
|
|
if (!getLexer().getAllowAtInIdentifier())
|
|
return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', "
|
|
"'%<type>' or \"<type>\"");
|
|
else if (getLexer().isNot(AsmToken::At))
|
|
return TokError("expected STT_<TYPE_IN_UPPER_CASE>, '#<type>', '@<type>', "
|
|
"'%<type>' or \"<type>\"");
|
|
}
|
|
|
|
if (getLexer().isNot(AsmToken::String) &&
|
|
getLexer().isNot(AsmToken::Identifier))
|
|
Lex();
|
|
|
|
SMLoc TypeLoc = getLexer().getLoc();
|
|
|
|
StringRef Type;
|
|
if (getParser().parseIdentifier(Type))
|
|
return TokError("expected symbol type in directive");
|
|
|
|
MCSymbolAttr Attr = MCAttrForString(Type);
|
|
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();
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in '.ident' directive");
|
|
Lex();
|
|
|
|
getStreamer().emitIdent(Data);
|
|
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");
|
|
|
|
// ARM assembly uses @ for a comment...
|
|
// except when parsing the second parameter of the .symver directive.
|
|
// Force the next symbol to allow @ in the identifier, which is
|
|
// required for this directive and then reset it to its initial state.
|
|
const bool AllowAtInIdentifier = getLexer().getAllowAtInIdentifier();
|
|
getLexer().setAllowAtInIdentifier(true);
|
|
Lex();
|
|
getLexer().setAllowAtInIdentifier(AllowAtInIdentifier);
|
|
|
|
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 *Sym = getContext().getOrCreateSymbol(Name);
|
|
getStreamer().emitELFSymverDirective(AliasName, Sym);
|
|
return false;
|
|
}
|
|
|
|
/// ParseDirectiveVersion
|
|
/// ::= .version string
|
|
bool ELFAsmParser::ParseDirectiveVersion(StringRef, SMLoc) {
|
|
if (getLexer().isNot(AsmToken::String))
|
|
return TokError("unexpected token in '.version' directive");
|
|
|
|
StringRef Data = getTok().getIdentifier();
|
|
|
|
Lex();
|
|
|
|
MCSection *Note = getContext().getELFSection(".note", ELF::SHT_NOTE, 0);
|
|
|
|
getStreamer().PushSection();
|
|
getStreamer().SwitchSection(Note);
|
|
getStreamer().emitInt32(Data.size() + 1); // namesz
|
|
getStreamer().emitInt32(0); // descsz = 0 (no description).
|
|
getStreamer().emitInt32(1); // type = NT_VERSION
|
|
getStreamer().emitBytes(Data); // name
|
|
getStreamer().emitInt8(0); // NUL
|
|
getStreamer().emitValueToAlignment(4);
|
|
getStreamer().PopSection();
|
|
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;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectiveSubsection(StringRef, SMLoc) {
|
|
const MCExpr *Subsection = nullptr;
|
|
if (getLexer().isNot(AsmToken::EndOfStatement)) {
|
|
if (getParser().parseExpression(Subsection))
|
|
return true;
|
|
}
|
|
|
|
if (getLexer().isNot(AsmToken::EndOfStatement))
|
|
return TokError("unexpected token in directive");
|
|
|
|
Lex();
|
|
|
|
getStreamer().SubSection(Subsection);
|
|
return false;
|
|
}
|
|
|
|
bool ELFAsmParser::ParseDirectiveCGProfile(StringRef S, SMLoc Loc) {
|
|
return MCAsmParserExtension::ParseDirectiveCGProfile(S, Loc);
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
MCAsmParserExtension *createELFAsmParser() {
|
|
return new ELFAsmParser;
|
|
}
|
|
|
|
} // end namespace llvm
|