Add AsmParser support for darwin tbss directive.
Nothing uses this yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103757 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index fe2164c..18977de 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -703,6 +703,8 @@
return ParseDirectiveDarwinSymbolDesc();
if (IDVal == ".lsym")
return ParseDirectiveDarwinLsym();
+ if (IDVal == ".tbss")
+ return ParseDirectiveDarwinTBSS();
if (IDVal == ".subsections_via_symbols")
return ParseDirectiveDarwinSubsectionsViaSymbols();
@@ -1427,6 +1429,61 @@
return false;
}
+/// ParseDirectiveDarwinTBSS
+/// ::= .tbss identifier, size, align
+bool AsmParser::ParseDirectiveDarwinTBSS() {
+ SMLoc IDLoc = Lexer.getLoc();
+ StringRef Name;
+ if (ParseIdentifier(Name))
+ return TokError("expected identifier in directive");
+
+ // Demangle the name output. The trailing characters are guaranteed to be
+ // $tlv$init so just strip that off.
+ StringRef DemName = Name.substr(0, Name.size() - strlen("$tlv$init"));
+
+ // Handle the identifier as the key symbol.
+ MCSymbol *Sym = CreateSymbol(DemName);
+
+ if (Lexer.isNot(AsmToken::Comma))
+ return TokError("unexpected token in directive");
+ Lex();
+
+ int64_t Size;
+ SMLoc SizeLoc = Lexer.getLoc();
+ if (ParseAbsoluteExpression(Size))
+ return true;
+
+ int64_t Pow2Alignment = 0;
+ SMLoc Pow2AlignmentLoc;
+ if (Lexer.is(AsmToken::Comma)) {
+ Lex();
+ Pow2AlignmentLoc = Lexer.getLoc();
+ if (ParseAbsoluteExpression(Pow2Alignment))
+ return true;
+ }
+
+ if (Lexer.isNot(AsmToken::EndOfStatement))
+ return TokError("unexpected token in '.tbss' directive");
+
+ Lex();
+
+ if (Size < 0)
+ return Error(SizeLoc, "invalid '.tbss' directive size, can't be less than"
+ "zero");
+
+ // FIXME: Diagnose overflow.
+ if (Pow2Alignment < 0)
+ return Error(Pow2AlignmentLoc, "invalid '.tbss' alignment, can't be less"
+ "than zero");
+
+ if (!Sym->isUndefined())
+ return Error(IDLoc, "invalid symbol redefinition");
+
+ Out.EmitTBSSSymbol(Sym, Size, Pow2Alignment ? 1 << Pow2Alignment : 0);
+
+ return false;
+}
+
/// ParseDirectiveDarwinSubsectionsViaSymbols
/// ::= .subsections_via_symbols
bool AsmParser::ParseDirectiveDarwinSubsectionsViaSymbols() {