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DebugInfo: Remove unused start/end labels for the debug_abbrevs section 

Since we always emit only one abbrevation section (shared by all the
compilation units in this module) there's no need for a separate label
at the start of each one (and we weren't using the CU ID anyway, so
there really was only one label). Use the section label instead and drop
the wholely unused debug_abbrev_end label.

llvm-svn: 196394
This commit is contained in:
David Blaikie 2013-12-04 18:12:28 +00:00
parent cbb51dacfb
commit 91db9ab1b4
2 changed files with 4 additions and 8 deletions
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6
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -2186,9 +2186,6 @@ void DwarfDebug::emitAbbrevs(const MCSection *Section,
// Start the debug abbrev section.
Asm->OutStreamer.SwitchSection(Section);
MCSymbol *Begin = Asm->GetTempSymbol(Section->getLabelBeginName());
Asm->OutStreamer.EmitLabel(Begin);
// For each abbrevation.
for (unsigned i = 0, N = Abbrevs->size(); i < N; ++i) {
// Get abbreviation data
@ -2203,9 +2200,6 @@ void DwarfDebug::emitAbbrevs(const MCSection *Section,
// Mark end of abbreviations.
Asm->EmitULEB128(0, "EOM(3)");
MCSymbol *End = Asm->GetTempSymbol(Section->getLabelEndName());
Asm->OutStreamer.EmitLabel(End);
}
}

6
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -1980,8 +1980,10 @@ void Unit::emitHeader(const MCSection *ASection, const MCSymbol *ASectionSym) {
Asm->OutStreamer.AddComment("DWARF version number");
Asm->EmitInt16(DD->getDwarfVersion());
Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
ASectionSym);
// We share one abbreviations table across all compilation units so it's
// always at the start of the section. Use a relocatable offset where needed
// to ensure linking doesn't invalidate that offset.
Asm->EmitSectionOffset(ASectionSym, ASectionSym);
Asm->OutStreamer.AddComment("Address Size (in bytes)");
Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
}