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Add support for having multiple sections with the same name and comdat.

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Using this in combination with -ffunction-sections allows LLVM to output a .o
file with mulitple sections named .text. This saves space by avoiding long
unique names of the form .text.<C++ mangled name>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228980 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-02-12 23:29:51 +00:00
parent 73a92d5136
commit 2fa06b171b
12 changed files with 126 additions and 29 deletions
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14
lib/MC/MCParser/ELFAsmParser.cpp
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@@ -378,6 +378,8 @@ bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
unsigned Flags = 0;
const MCExpr *Subsection = nullptr;
bool UseLastGroup = false;
StringRef UniqueStr;
bool Unique = false;
// Set the defaults first.
if (SectionName == ".fini" || SectionName == ".init" ||
@@ -462,6 +464,14 @@ bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
return TokError("Linkage must be 'comdat'");
}
}
if (getLexer().is(AsmToken::Comma)) {
Lex();
if (getParser().parseIdentifier(UniqueStr))
return TokError("expected identifier in directive");
if (UniqueStr != "unique")
return TokError("expected 'unique'");
Unique = true;
}
}
}
@@ -509,8 +519,8 @@ EndStmt:
}
}
const MCSection *ELFSection =
getContext().getELFSection(SectionName, Type, Flags, Size, GroupName);
const MCSection *ELFSection = getContext().getELFSection(
SectionName, Type, Flags, Size, GroupName, Unique);
getStreamer().SwitchSection(ELFSection, Subsection);
if (getContext().getGenDwarfForAssembly()) {