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Support for .ifdef / .ifndef in the assembler parser. Patch by Joerg Sonnenberger.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125120 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-02-08 22:29:56 +00:00
parent d08d77318a
commit 0fd90bc12f
3 changed files with 89 additions and 1 deletions
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32
lib/MC/MCParser/AsmParser.cpp
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@@ -202,6 +202,8 @@ private:
bool ParseDirectiveInclude(); // ".include"
bool ParseDirectiveIf(SMLoc DirectiveLoc); // ".if"
// ".ifdef" or ".ifndef", depending on expect_defined
bool ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
bool ParseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
@@ -222,7 +224,6 @@ class GenericAsmParser : public MCAsmParserExtension {
getParser().AddDirectiveHandler(this, Directive,
HandleDirective<GenericAsmParser, Handler>);
}
public:
GenericAsmParser() {}
@@ -887,6 +888,10 @@ bool AsmParser::ParseStatement() {
// example.
if (IDVal == ".if")
return ParseDirectiveIf(IDLoc);
if (IDVal == ".ifdef")
return ParseDirectiveIfdef(IDLoc, true);
if (IDVal == ".ifndef" || IDVal == ".ifnotdef")
return ParseDirectiveIfdef(IDLoc, false);
if (IDVal == ".elseif")
return ParseDirectiveElseIf(IDLoc);
if (IDVal == ".else")
@@ -1933,6 +1938,31 @@ bool AsmParser::ParseDirectiveIf(SMLoc DirectiveLoc) {
return false;
}
bool AsmParser::ParseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
StringRef Name;
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
if (TheCondState.Ignore) {
EatToEndOfStatement();
} else {
if (ParseIdentifier(Name))
return TokError("expected identifier after '.ifdef'");
Lex();
MCSymbol *Sym = getContext().LookupSymbol(Name);
if (expect_defined)
TheCondState.CondMet = (Sym != NULL && !Sym->isUndefined());
else
TheCondState.CondMet = (Sym == NULL || Sym->isUndefined());
TheCondState.Ignore = !TheCondState.CondMet;
}
return false;
}
/// ParseDirectiveElseIf
/// ::= .elseif expression
bool AsmParser::ParseDirectiveElseIf(SMLoc DirectiveLoc) {