Add support for Microsoft __if_exists and __if_not_exists construct inside function definition.
Allow to include or exclude code depending on if a symbol exists or not. Just like a #ifdef but for C/C++ symbols.
More doc: http://msdn.microsoft.com/en-us/library/x7wy9xh3(v=VS.100).aspx
Support at class and namespace scopes will be added later.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131014 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseStmt.cpp b/lib/Parse/ParseStmt.cpp
index f0ab531..12ab5e2 100644
--- a/lib/Parse/ParseStmt.cpp
+++ b/lib/Parse/ParseStmt.cpp
@@ -741,6 +741,12 @@
continue;
}
+ if (getLang().Microsoft && (Tok.is(tok::kw___if_exists) ||
+ Tok.is(tok::kw___if_not_exists))) {
+ ParseMicrosoftIfExistsStatement(Stmts);
+ continue;
+ }
+
StmtResult R;
if (Tok.isNot(tok::kw___extension__)) {
R = ParseStatementOrDeclaration(Stmts, false);
@@ -2000,3 +2006,67 @@
return Actions.ActOnCXXCatchBlock(CatchLoc, ExceptionDecl, Block.take());
}
+
+void Parser::ParseMicrosoftIfExistsStatement(StmtVector &Stmts) {
+ assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
+ "Expected '__if_exists' or '__if_not_exists'");
+ Token Condition = Tok;
+ SourceLocation IfExistsLoc = ConsumeToken();
+
+ SourceLocation LParenLoc = Tok.getLocation();
+ if (Tok.isNot(tok::l_paren)) {
+ Diag(Tok, diag::err_expected_lparen_after) << IfExistsLoc;
+ SkipUntil(tok::semi);
+ return;
+ }
+ ConsumeParen(); // eat the '('.
+
+ // Parse nested-name-specifier.
+ CXXScopeSpec SS;
+ ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false);
+
+ // Check nested-name specifier.
+ if (SS.isInvalid()) {
+ SkipUntil(tok::semi);
+ return;
+ }
+
+ // Parse the unqualified-id.
+ UnqualifiedId Name;
+ if (ParseUnqualifiedId(SS, false, true, true, ParsedType(), Name)) {
+ SkipUntil(tok::semi);
+ return;
+ }
+
+ if (MatchRHSPunctuation(tok::r_paren, LParenLoc).isInvalid())
+ return;
+
+ if (Tok.isNot(tok::l_brace)) {
+ Diag(Tok, diag::err_expected_lbrace);
+ return;
+ }
+ ConsumeBrace();
+
+ // Check if the symbol exists.
+ bool Exist = Actions.CheckMicrosoftIfExistsSymbol(SS, Name);
+
+ // If the condition is false skip the tokens until the '}'
+ if ((Condition.is(tok::kw___if_exists) && !Exist) ||
+ (Condition.is(tok::kw___if_not_exists) && Exist)) {
+ SkipUntil(tok::r_brace, false);
+ return;
+ }
+
+ // Condition is true, parse the statements.
+ while (Tok.isNot(tok::r_brace)) {
+ StmtResult R = ParseStatementOrDeclaration(Stmts, false);
+ if (R.isUsable())
+ Stmts.push_back(R.release());
+ }
+
+ if (Tok.isNot(tok::r_brace)) {
+ Diag(Tok, diag::err_expected_rbrace);
+ return;
+ }
+ ConsumeBrace();
+}