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Poison and unpoison __VA_ARGS__ when appropriate 

llvm-svn: 38770
This commit is contained in:
Chris Lattner 2006-07-29 03:46:57 +00:00
parent e7a5130dff
commit 7e37483f14
1 changed files with 15 additions and 2 deletions
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17
clang/Lex/Preprocessor.cpp
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@ -1696,8 +1696,6 @@ void Preprocessor::HandleDefineDirective(LexerToken &DefineTok) {
LexerToken Tok;
LexUnexpandedToken(Tok);
// FIXME: Enable __VA_ARGS__.
// If this is a function-like macro definition, parse the argument list,
// marking each of the identifiers as being used as macro arguments. Also,
// check other constraints on the first token of the macro body.
@ -1732,6 +1730,15 @@ void Preprocessor::HandleDefineDirective(LexerToken &DefineTok) {
Tok.ClearFlag(LexerToken::LeadingSpace);
}
// If this is a definition of a variadic C99 function-like macro, not using
// the GNU named varargs extension, enabled __VA_ARGS__.
// "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
// This gets unpoisoned where it is allowed.
assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!");
if (MI->isC99Varargs())
Ident__VA_ARGS__->setIsPoisoned(false);
// Read the rest of the macro body.
while (Tok.getKind() != tok::eom) {
MI->AddTokenToBody(Tok);
@ -1752,6 +1759,9 @@ void Preprocessor::HandleDefineDirective(LexerToken &DefineTok) {
MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) {
Diag(Tok, diag::err_pp_stringize_not_parameter);
delete MI;
// Disable __VA_ARGS__ again.
Ident__VA_ARGS__->setIsPoisoned(true);
return;
}
@ -1762,6 +1772,9 @@ void Preprocessor::HandleDefineDirective(LexerToken &DefineTok) {
LexUnexpandedToken(Tok);
}
// Disable __VA_ARGS__ again.
Ident__VA_ARGS__->setIsPoisoned(true);
// Check that there is no paste (##) operator at the begining or end of the
// replacement list.
unsigned NumTokens = MI->getNumTokens();