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ELF: Add support for the asm .version directive.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156712 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-05-12 14:30:47 +00:00
parent bc3b27ccd9
commit 6a80f9da8c
2 changed files with 45 additions and 0 deletions
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28
lib/MC/MCParser/ELFAsmParser.cpp
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@ -64,6 +64,7 @@ public:
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveType>(".type");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveIdent>(".ident"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveIdent>(".ident");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymver>(".symver"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymver>(".symver");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveVersion>(".version");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveWeakref>(".weakref"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveWeakref>(".weakref");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".weak"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".weak");
AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".local"); AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSymbolAttribute>(".local");
@ -141,6 +142,7 @@ public:
bool ParseDirectiveType(StringRef, SMLoc); bool ParseDirectiveType(StringRef, SMLoc);
bool ParseDirectiveIdent(StringRef, SMLoc); bool ParseDirectiveIdent(StringRef, SMLoc);
bool ParseDirectiveSymver(StringRef, SMLoc); bool ParseDirectiveSymver(StringRef, SMLoc);
bool ParseDirectiveVersion(StringRef, SMLoc);
bool ParseDirectiveWeakref(StringRef, SMLoc); bool ParseDirectiveWeakref(StringRef, SMLoc);
bool ParseDirectiveSymbolAttribute(StringRef, SMLoc); bool ParseDirectiveSymbolAttribute(StringRef, SMLoc);
@ -548,6 +550,32 @@ bool ELFAsmParser::ParseDirectiveSymver(StringRef, SMLoc) {
return false; 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();
const MCSection *Note =
getContext().getELFSection(".note", ELF::SHT_NOTE, 0,
SectionKind::getReadOnly());
getStreamer().PushSection();
getStreamer().SwitchSection(Note);
getStreamer().EmitIntValue(Data.size()+1, 4); // namesz.
getStreamer().EmitIntValue(0, 4); // descsz = 0 (no description).
getStreamer().EmitIntValue(1, 4); // type = NT_VERSION.
getStreamer().EmitBytes(Data, 0); // name.
getStreamer().EmitIntValue(0, 1); // terminate the string.
getStreamer().EmitValueToAlignment(4); // ensure 4 byte alignment.
getStreamer().PopSection();
return false;
}
/// ParseDirectiveWeakref /// ParseDirectiveWeakref
/// ::= .weakref foo, bar /// ::= .weakref foo, bar
bool ELFAsmParser::ParseDirectiveWeakref(StringRef, SMLoc) { bool ELFAsmParser::ParseDirectiveWeakref(StringRef, SMLoc) {

17
test/MC/ELF/version.s Normal file
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@ -0,0 +1,17 @@
// RUN: llvm-mc -filetype=obj -triple i386-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck %s
.version "1234"
.version "123"
// CHECK: (('sh_name', 0x0000000c) # '.note'
// CHECK-NEXT: ('sh_type', 0x00000007)
// CHECK-NEXT: ('sh_flags', 0x00000000)
// CHECK-NEXT: ('sh_addr', 0x00000000)
// CHECK-NEXT: ('sh_offset', 0x00000034)
// CHECK-NEXT: ('sh_size', 0x00000024)
// CHECK-NEXT: ('sh_link', 0x00000000)
// CHECK-NEXT: ('sh_info', 0x00000000)
// CHECK-NEXT: ('sh_addralign', 0x00000004)
// CHECK-NEXT: ('sh_entsize', 0x00000000)
// CHECK-NEXT: ('_section_data', '05000000 00000000 01000000 31323334 00000000 04000000 00000000 01000000 31323300')
// CHECK-NEXT: ),