//===----------------------------------------------------------------------===//
#include "llvm/MC/MCParser/MCAsmParserExtension.h"
-#include "llvm/MC/MCSectionELF.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCStreamer.h"
using namespace llvm;
namespace {
class ELFAsmParser : public MCAsmParserExtension {
+ template<bool (ELFAsmParser::*Handler)(StringRef, SMLoc)>
+ void AddDirectiveHandler(StringRef Directive) {
+ getParser().AddDirectiveHandler(this, Directive,
+ HandleDirective<ELFAsmParser, Handler>);
+ }
+
bool ParseSectionSwitch(StringRef Section, unsigned Type,
unsigned Flags, SectionKind Kind);
// Call the base implementation.
this->MCAsmParserExtension::Initialize(Parser);
- Parser.AddDirectiveHandler(this, ".data", MCAsmParser::DirectiveHandler(
- &ELFAsmParser::ParseSectionDirectiveData));
- Parser.AddDirectiveHandler(this, ".text", MCAsmParser::DirectiveHandler(
- &ELFAsmParser::ParseSectionDirectiveText));
+ 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::ParseSectionDirectiveDataRelRoLocal>(".data.rel.ro.local");
+ AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
+ AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
+ AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSize>(".size");
+ AddDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
+ AddDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type");
}
+ // 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", MCSectionELF::SHT_PROGBITS,
MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
MCSectionELF::SHF_EXECINSTR |
MCSectionELF::SHF_ALLOC, SectionKind::getText());
}
+ bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
+ return ParseSectionSwitch(".bss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_WRITE |
+ MCSectionELF::SHF_ALLOC, SectionKind::getBSS());
+ }
+ bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
+ return ParseSectionSwitch(".rodata", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC,
+ SectionKind::getReadOnly());
+ }
+ bool ParseSectionDirectiveTData(StringRef, SMLoc) {
+ return ParseSectionSwitch(".tdata", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_TLS | MCSectionELF::SHF_WRITE,
+ SectionKind::getThreadData());
+ }
+ bool ParseSectionDirectiveTBSS(StringRef, SMLoc) {
+ return ParseSectionSwitch(".tbss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_TLS | MCSectionELF::SHF_WRITE,
+ SectionKind::getThreadBSS());
+ }
+ bool ParseSectionDirectiveDataRel(StringRef, SMLoc) {
+ return ParseSectionSwitch(".data.rel", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+ }
+ bool ParseSectionDirectiveDataRelRo(StringRef, SMLoc) {
+ return ParseSectionSwitch(".data.rel.ro", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_WRITE,
+ SectionKind::getReadOnlyWithRel());
+ }
+ bool ParseSectionDirectiveDataRelRoLocal(StringRef, SMLoc) {
+ return ParseSectionSwitch(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_WRITE,
+ SectionKind::getReadOnlyWithRelLocal());
+ }
+ bool ParseSectionDirectiveEhFrame(StringRef, SMLoc) {
+ return ParseSectionSwitch(".eh_frame", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+ }
+ bool ParseDirectiveSection(StringRef, SMLoc);
+ bool ParseDirectiveSize(StringRef, SMLoc);
+ bool ParseDirectivePrevious(StringRef, SMLoc);
+ bool ParseDirectiveType(StringRef, SMLoc);
+
+private:
+ bool ParseSectionName(StringRef &SectionName);
};
}
return false;
}
+bool ELFAsmParser::ParseDirectiveSize(StringRef, SMLoc) {
+ StringRef Name;
+ if (getParser().ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+ MCSymbol *Sym = 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");
+
+ 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;
+
+ for (;;) {
+ StringRef Tmp;
+ unsigned CurSize;
+
+ SMLoc PrevLoc = getLexer().getLoc();
+ if (getLexer().is(AsmToken::Minus)) {
+ CurSize = 1;
+ Lex(); // Consume the "-".
+ } else if (!getParser().ParseIdentifier(Tmp))
+ CurSize = Tmp.size();
+ else
+ break;
+
+ 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;
+}
+
+// FIXME: This is a work in progress.
+bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
+ StringRef SectionName;
+
+ if (ParseSectionName(SectionName))
+ return TokError("expected identifier in directive");
+
+ std::string FlagsStr;
+ StringRef TypeName;
+ int64_t Size = 0;
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+
+ if (getLexer().isNot(AsmToken::String))
+ return TokError("expected string in directive");
+
+ FlagsStr = getTok().getStringContents();
+ Lex();
+
+ AsmToken::TokenKind TypeStartToken;
+ if (getContext().getAsmInfo().getCommentString()[0] == '@')
+ TypeStartToken = AsmToken::Percent;
+ else
+ TypeStartToken = AsmToken::At;
+
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+ if (getLexer().is(TypeStartToken)) {
+ Lex();
+ if (getParser().ParseIdentifier(TypeName))
+ return TokError("expected identifier in directive");
+
+ if (getLexer().is(AsmToken::Comma)) {
+ Lex();
+
+ if (getParser().ParseAbsoluteExpression(Size))
+ return true;
+
+ if (Size <= 0)
+ return TokError("section size must be positive");
+ }
+ }
+ }
+ }
+
+ if (getLexer().isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in directive");
+
+ unsigned Flags = 0;
+ for (unsigned i = 0; i < FlagsStr.size(); i++) {
+ switch (FlagsStr[i]) {
+ case 'a':
+ Flags |= MCSectionELF::SHF_ALLOC;
+ break;
+ case 'x':
+ Flags |= MCSectionELF::SHF_EXECINSTR;
+ break;
+ case 'w':
+ Flags |= MCSectionELF::SHF_WRITE;
+ break;
+ case 'M':
+ Flags |= MCSectionELF::SHF_MERGE;
+ break;
+ case 'S':
+ Flags |= MCSectionELF::SHF_STRINGS;
+ break;
+ case 'T':
+ Flags |= MCSectionELF::SHF_TLS;
+ break;
+ case 'c':
+ Flags |= MCSectionELF::XCORE_SHF_CP_SECTION;
+ break;
+ case 'd':
+ Flags |= MCSectionELF::XCORE_SHF_DP_SECTION;
+ break;
+ default:
+ return TokError("unknown flag");
+ }
+ }
+
+ unsigned Type = MCSectionELF::SHT_NULL;
+ if (!TypeName.empty()) {
+ if (TypeName == "init_array")
+ Type = MCSectionELF::SHT_INIT_ARRAY;
+ else if (TypeName == "fini_array")
+ Type = MCSectionELF::SHT_FINI_ARRAY;
+ else if (TypeName == "preinit_array")
+ Type = MCSectionELF::SHT_PREINIT_ARRAY;
+ else if (TypeName == "nobits")
+ Type = MCSectionELF::SHT_NOBITS;
+ else if (TypeName == "progbits")
+ Type = MCSectionELF::SHT_PROGBITS;
+ else
+ return TokError("unknown section type");
+ }
+
+ SectionKind Kind = (Flags & MCSectionELF::SHF_EXECINSTR)
+ ? SectionKind::getText()
+ : SectionKind::getDataRel();
+ getStreamer().SwitchSection(getContext().getELFSection(SectionName, Type,
+ Flags, Kind, false,
+ Size));
+ return false;
+}
+
+bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
+ const MCSection *PreviousSection = getStreamer().getPreviousSection();
+ if (PreviousSection != NULL)
+ 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::At))
+ return TokError("expected '@' 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)
+ .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;
+}
+
namespace llvm {
MCAsmParserExtension *createELFAsmParser() {
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