//===----------------------------------------------------------------------===//
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
+#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
-#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ELF.h"
using namespace llvm;
namespace {
bool ParseSectionSwitch(StringRef Section, unsigned Type,
unsigned Flags, SectionKind Kind);
+ bool SeenIdent;
public:
- ELFAsmParser() {}
+ ELFAsmParser() : SeenIdent(false) {}
virtual void Initialize(MCAsmParser &Parser) {
// Call the base implementation.
AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveDataRelRoLocal>(".data.rel.ro.local");
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::ParseDirectiveWeakref>(".weakref");
}
// 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) {
- bool ret = ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
+ return ParseSectionSwitch(".data", ELF::SHT_PROGBITS,
+ ELF::SHF_WRITE |ELF::SHF_ALLOC,
SectionKind::getDataRel());
- getStreamer().EmitCodeAlignment(4, 0);
- return ret;
}
bool ParseSectionDirectiveText(StringRef, SMLoc) {
- bool ret = ParseSectionSwitch(".text", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_EXECINSTR |
- MCSectionELF::SHF_ALLOC, SectionKind::getText());
- getStreamer().EmitCodeAlignment(4, 0);
- return ret;
+ return ParseSectionSwitch(".text", ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR |
+ ELF::SHF_ALLOC, SectionKind::getText());
}
bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
- bool ret = ParseSectionSwitch(".bss", MCSectionELF::SHT_NOBITS,
- MCSectionELF::SHF_WRITE |
- MCSectionELF::SHF_ALLOC, SectionKind::getBSS());
- getStreamer().EmitCodeAlignment(4, 0);
- return ret;
+ return ParseSectionSwitch(".bss", ELF::SHT_NOBITS,
+ ELF::SHF_WRITE |
+ ELF::SHF_ALLOC, SectionKind::getBSS());
}
bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
- return ParseSectionSwitch(".rodata", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC,
+ return ParseSectionSwitch(".rodata", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC,
SectionKind::getReadOnly());
}
bool ParseSectionDirectiveTData(StringRef, SMLoc) {
- return ParseSectionSwitch(".tdata", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_TLS | MCSectionELF::SHF_WRITE,
+ return ParseSectionSwitch(".tdata", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC |
+ ELF::SHF_TLS | ELF::SHF_WRITE,
SectionKind::getThreadData());
}
bool ParseSectionDirectiveTBSS(StringRef, SMLoc) {
- return ParseSectionSwitch(".tbss", MCSectionELF::SHT_NOBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_TLS | MCSectionELF::SHF_WRITE,
+ 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", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_WRITE,
+ return ParseSectionSwitch(".data.rel", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC |
+ ELF::SHF_WRITE,
SectionKind::getDataRel());
}
bool ParseSectionDirectiveDataRelRo(StringRef, SMLoc) {
- return ParseSectionSwitch(".data.rel.ro", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_WRITE,
+ return ParseSectionSwitch(".data.rel.ro", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC |
+ ELF::SHF_WRITE,
SectionKind::getReadOnlyWithRel());
}
bool ParseSectionDirectiveDataRelRoLocal(StringRef, SMLoc) {
- return ParseSectionSwitch(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_WRITE,
+ return ParseSectionSwitch(".data.rel.ro.local", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC |
+ ELF::SHF_WRITE,
SectionKind::getReadOnlyWithRelLocal());
}
bool ParseSectionDirectiveEhFrame(StringRef, SMLoc) {
- return ParseSectionSwitch(".eh_frame", MCSectionELF::SHT_PROGBITS,
- MCSectionELF::SHF_ALLOC |
- MCSectionELF::SHF_WRITE,
+ return ParseSectionSwitch(".eh_frame", ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC |
+ ELF::SHF_WRITE,
SectionKind::getDataRel());
}
+ 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 ParseDirectiveWeakref(StringRef, SMLoc);
+
+private:
+ bool ParseSectionName(StringRef &SectionName);
};
}
return false;
}
-// FIXME: This is a work in progress.
-bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
- StringRef SectionName;
- // FIXME: This doesn't parse section names like ".note.GNU-stack" correctly.
- if (getParser().ParseIdentifier(SectionName))
- return TokError("expected identifier in directive");
+bool ELFAsmParser::ParseSectionName(StringRef &SectionName) {
+ // A section name can contain -, so we cannot just use
+ // ParseIdentifier.
+ SMLoc FirstLoc = getLexer().getLoc();
+ unsigned Size = 0;
- std::string FlagsStr;
- StringRef TypeName;
- int64_t Size = 0;
- if (getLexer().is(AsmToken::Comma)) {
+ if (getLexer().is(AsmToken::String)) {
+ SectionName = getTok().getIdentifier();
Lex();
+ return false;
+ }
- if (getLexer().isNot(AsmToken::String))
- return TokError("expected string in directive");
-
- FlagsStr = getTok().getStringContents();
- Lex();
+ for (;;) {
+ StringRef Tmp;
+ unsigned CurSize;
- AsmToken::TokenKind TypeStartToken;
- if (getContext().getAsmInfo().getCommentString()[0] == '@')
- TypeStartToken = AsmToken::Percent;
- else
- TypeStartToken = AsmToken::At;
-
- if (getLexer().is(AsmToken::Comma)) {
+ SMLoc PrevLoc = getLexer().getLoc();
+ if (getLexer().is(AsmToken::Minus)) {
+ CurSize = 1;
+ Lex(); // Consume the "-".
+ } else if (getLexer().is(AsmToken::String)) {
+ CurSize = getTok().getIdentifier().size() + 2;
Lex();
- if (getLexer().is(TypeStartToken)) {
- Lex();
- if (getParser().ParseIdentifier(TypeName))
- return TokError("expected identifier in directive");
-
- if (getLexer().is(AsmToken::Comma)) {
- Lex();
+ } else if (getLexer().is(AsmToken::Identifier)) {
+ CurSize = getTok().getIdentifier().size();
+ Lex();
+ } else {
+ break;
+ }
- if (getParser().ParseAbsoluteExpression(Size))
- return true;
+ Size += CurSize;
+ SectionName = StringRef(FirstLoc.getPointer(), Size);
- if (Size <= 0)
- return TokError("section size must be positive");
- }
- }
- }
+ // Make sure the following token is adjacent.
+ if (PrevLoc.getPointer() + CurSize != getTok().getLoc().getPointer())
+ break;
}
+ if (Size == 0)
+ return true;
- if (getLexer().isNot(AsmToken::EndOfStatement))
- return TokError("unexpected token in directive");
+ return false;
+}
- unsigned Flags = 0;
- for (unsigned i = 0; i < FlagsStr.size(); i++) {
- switch (FlagsStr[i]) {
+static SectionKind computeSectionKind(unsigned Flags) {
+ if (Flags & ELF::SHF_EXECINSTR)
+ return SectionKind::getText();
+ if (Flags & ELF::SHF_TLS)
+ return SectionKind::getThreadData();
+ return SectionKind::getDataRel();
+}
+
+static int parseSectionFlags(StringRef flagsStr) {
+ int flags = 0;
+
+ for (unsigned i = 0; i < flagsStr.size(); i++) {
+ switch (flagsStr[i]) {
case 'a':
- Flags |= MCSectionELF::SHF_ALLOC;
+ flags |= ELF::SHF_ALLOC;
break;
case 'x':
- Flags |= MCSectionELF::SHF_EXECINSTR;
+ flags |= ELF::SHF_EXECINSTR;
break;
case 'w':
- Flags |= MCSectionELF::SHF_WRITE;
+ flags |= ELF::SHF_WRITE;
break;
case 'M':
- Flags |= MCSectionELF::SHF_MERGE;
+ flags |= ELF::SHF_MERGE;
break;
case 'S':
- Flags |= MCSectionELF::SHF_STRINGS;
+ flags |= ELF::SHF_STRINGS;
break;
case 'T':
- Flags |= MCSectionELF::SHF_TLS;
+ flags |= ELF::SHF_TLS;
break;
case 'c':
- Flags |= MCSectionELF::XCORE_SHF_CP_SECTION;
+ flags |= ELF::XCORE_SHF_CP_SECTION;
break;
case 'd':
- Flags |= MCSectionELF::XCORE_SHF_DP_SECTION;
+ flags |= ELF::XCORE_SHF_DP_SECTION;
+ break;
+ case 'G':
+ flags |= ELF::SHF_GROUP;
break;
default:
+ return -1;
+ }
+ }
+
+ return flags;
+}
+
+bool ELFAsmParser::ParseDirectivePushSection(StringRef s, SMLoc loc) {
+ getStreamer().PushSection();
+
+ if (ParseDirectiveSection(s, loc)) {
+ getStreamer().PopSection();
+ return true;
+ }
+
+ return false;
+}
+
+bool ELFAsmParser::ParseDirectivePopSection(StringRef, SMLoc) {
+ if (!getStreamer().PopSection())
+ return TokError(".popsection without corresponding .pushsection");
+ return false;
+}
+
+// FIXME: This is a work in progress.
+bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
+ StringRef SectionName;
+
+ if (ParseSectionName(SectionName))
+ return TokError("expected identifier in directive");
+
+ StringRef TypeName;
+ int64_t Size = 0;
+ StringRef GroupName;
+ unsigned Flags = 0;
+
+ // Set the defaults first.
+ if (SectionName == ".fini" || SectionName == ".init" ||
+ SectionName == ".rodata")
+ Flags |= ELF::SHF_ALLOC;
+ if (SectionName == ".fini" || SectionName == ".init")
+ Flags |= ELF::SHF_EXECINSTR;
+
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("expected string in directive");
+
+ StringRef FlagsStr = getTok().getStringContents();
+ Lex();
+
+ int extraFlags = parseSectionFlags(FlagsStr);
+ if (extraFlags < 0)
return TokError("unknown flag");
+ Flags |= extraFlags;
+
+ bool Mergeable = Flags & ELF::SHF_MERGE;
+ bool Group = Flags & ELF::SHF_GROUP;
+
+ if (getLexer().isNot(AsmToken::Comma)) {
+ if (Mergeable)
+ return TokError("Mergeable section must specify the type");
+ if (Group)
+ return TokError("Group section must specify the type");
+ } else {
+ Lex();
+ if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
+ return TokError("expected '@' or '%' before type");
+
+ Lex();
+ if (getParser().ParseIdentifier(TypeName))
+ return TokError("expected identifier in directive");
+
+ if (Mergeable) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("expected the entry size");
+ Lex();
+ if (getParser().ParseAbsoluteExpression(Size))
+ return true;
+ if (Size <= 0)
+ return TokError("entry size must be positive");
+ }
+
+ if (Group) {
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("expected group name");
+ Lex();
+ if (getParser().ParseIdentifier(GroupName))
+ return true;
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+ StringRef Linkage;
+ if (getParser().ParseIdentifier(Linkage))
+ return true;
+ if (Linkage != "comdat")
+ return TokError("Linkage must be 'comdat'");
+ }
+ }
}
}
- unsigned Type = MCSectionELF::SHT_NULL;
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in directive");
+
+ unsigned Type = ELF::SHT_PROGBITS;
+
if (!TypeName.empty()) {
if (TypeName == "init_array")
- Type = MCSectionELF::SHT_INIT_ARRAY;
+ Type = ELF::SHT_INIT_ARRAY;
else if (TypeName == "fini_array")
- Type = MCSectionELF::SHT_FINI_ARRAY;
+ Type = ELF::SHT_FINI_ARRAY;
else if (TypeName == "preinit_array")
- Type = MCSectionELF::SHT_PREINIT_ARRAY;
+ Type = ELF::SHT_PREINIT_ARRAY;
else if (TypeName == "nobits")
- Type = MCSectionELF::SHT_NOBITS;
+ Type = ELF::SHT_NOBITS;
else if (TypeName == "progbits")
- Type = MCSectionELF::SHT_PROGBITS;
+ Type = ELF::SHT_PROGBITS;
+ else if (TypeName == "note")
+ Type = ELF::SHT_NOTE;
+ else if (TypeName == "unwind")
+ Type = ELF::SHT_X86_64_UNWIND;
else
return TokError("unknown section type");
}
- SectionKind Kind = (Flags & MCSectionELF::SHF_EXECINSTR)
- ? SectionKind::getText()
- : SectionKind::getDataRel();
+ SectionKind Kind = computeSectionKind(Flags);
getStreamer().SwitchSection(getContext().getELFSection(SectionName, Type,
- Flags, Kind, false));
+ Flags, Kind, Size,
+ GroupName));
return false;
}
bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
const MCSection *PreviousSection = getStreamer().getPreviousSection();
- if (PreviousSection != NULL)
- getStreamer().SwitchSection(PreviousSection);
+ if (PreviousSection == NULL)
+ return TokError(".previous without corresponding .section");
+ getStreamer().SwitchSection(PreviousSection);
+
+ return false;
+}
+
+/// ParseDirectiveELFType
+/// ::= .type identifier , @attribute
+bool ELFAsmParser::ParseDirectiveType(StringRef, SMLoc) {
+ StringRef Name;
+ if (getParser().ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ // Handle the identifier as the key symbol.
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("unexpected token in '.type' directive");
+ Lex();
+
+ if (getLexer().isNot(AsmToken::Percent) && getLexer().isNot(AsmToken::At))
+ return TokError("expected '@' or '%' before type");
+ Lex();
+
+ StringRef Type;
+ SMLoc TypeLoc;
+
+ TypeLoc = getLexer().getLoc();
+ if (getParser().ParseIdentifier(Type))
+ return TokError("expected symbol type in directive");
+
+ MCSymbolAttr Attr = StringSwitch<MCSymbolAttr>(Type)
+ .Case("function", MCSA_ELF_TypeFunction)
+ .Case("object", MCSA_ELF_TypeObject)
+ .Case("tls_object", MCSA_ELF_TypeTLS)
+ .Case("common", MCSA_ELF_TypeCommon)
+ .Case("notype", MCSA_ELF_TypeNoType)
+ .Case("gnu_unique_object", MCSA_ELF_TypeGnuUniqueObject)
+ .Default(MCSA_Invalid);
+
+ if (Attr == MCSA_Invalid)
+ return Error(TypeLoc, "unsupported attribute in '.type' directive");
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.type' directive");
+
+ Lex();
+
+ getStreamer().EmitSymbolAttribute(Sym, Attr);
+
+ return false;
+}
+
+/// ParseDirectiveIdent
+/// ::= .ident string
+bool ELFAsmParser::ParseDirectiveIdent(StringRef, SMLoc) {
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("unexpected token in '.ident' directive");
+
+ StringRef Data = getTok().getIdentifier();
+
+ Lex();
+
+ const MCSection *Comment =
+ getContext().getELFSection(".comment", ELF::SHT_PROGBITS,
+ ELF::SHF_MERGE |
+ ELF::SHF_STRINGS,
+ SectionKind::getReadOnly(),
+ 1, "");
+
+ getStreamer().PushSection();
+ getStreamer().SwitchSection(Comment);
+ if (!SeenIdent) {
+ getStreamer().EmitIntValue(0, 1);
+ SeenIdent = true;
+ }
+ getStreamer().EmitBytes(Data, 0);
+ getStreamer().EmitIntValue(0, 1);
+ getStreamer().PopSection();
+ return false;
+}
+
+/// ParseDirectiveSymver
+/// ::= .symver foo, bar2@zed
+bool ELFAsmParser::ParseDirectiveSymver(StringRef, SMLoc) {
+ StringRef Name;
+ if (getParser().ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("expected a comma");
+
+ Lex();
+
+ StringRef AliasName;
+ if (getParser().ParseIdentifier(AliasName))
+ return TokError("expected identifier in directive");
+
+ if (AliasName.find('@') == StringRef::npos)
+ return TokError("expected a '@' in the name");
+
+ MCSymbol *Alias = getContext().GetOrCreateSymbol(AliasName);
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+ const MCExpr *Value = MCSymbolRefExpr::Create(Sym, getContext());
+
+ getStreamer().EmitAssignment(Alias, Value);
+ return false;
+}
+
+/// ParseDirectiveWeakref
+/// ::= .weakref foo, bar
+bool ELFAsmParser::ParseDirectiveWeakref(StringRef, SMLoc) {
+ // FIXME: Share code with the other alias building directives.
+
+ StringRef AliasName;
+ if (getParser().ParseIdentifier(AliasName))
+ return TokError("expected identifier in directive");
+
+ if (getLexer().isNot(AsmToken::Comma))
+ return TokError("expected a comma");
+
+ Lex();
+
+ StringRef Name;
+ if (getParser().ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ MCSymbol *Alias = getContext().GetOrCreateSymbol(AliasName);
+
+ MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+ getStreamer().EmitWeakReference(Alias, Sym);
return false;
}
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