Allow thread safety attributes on function definitions.

For compatibility with gcc, clang will now parse gcc attributes on
function definitions, but issue a warning if the attribute is not a
thread safety attribute.  Warning controlled by -Wgcc-compat.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150698 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 2 deletions

diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
index 4d8f474514..c797436948 100644
--- a/lib/Parse/Parser.cpp
+++ b/lib/Parse/Parser.cpp
@@ -821,7 +821,8 @@ Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributes &attrs,
 ///         decl-specifier-seq[opt] declarator function-try-block
 ///
 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
-                                      const ParsedTemplateInfo &TemplateInfo) {
+                                      const ParsedTemplateInfo &TemplateInfo,
+                                      LateParsedAttrList *LateParsedAttrs) {
   // Poison the SEH identifiers so they are flagged as illegal in function bodies
   PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
   const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
@@ -844,7 +845,6 @@ Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
   if (FTI.isKNRPrototype())
     ParseKNRParamDeclarations(D);
 
-
   // We should have either an opening brace or, in a C++ constructor,
   // we may have a colon.
   if (Tok.isNot(tok::l_brace) && 
@@ -861,6 +861,19 @@ Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
       return 0;
   }
 
+  // Check to make sure that any normal attributes are allowed to be on
+  // a definition.  Late parsed attributes are checked at the end.
+  if (Tok.isNot(tok::equal)) {
+    AttributeList *DtorAttrs = D.getAttributes();
+    while (DtorAttrs) {
+      if (!IsThreadSafetyAttribute(DtorAttrs->getName()->getName())) {
+        Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
+          << DtorAttrs->getName()->getName();
+      }
+      DtorAttrs = DtorAttrs->getNext();
+    }
+  }
+
   // In delayed template parsing mode, for function template we consume the
   // tokens and store them for late parsing at the end of the translation unit.
   if (getLang().DelayedTemplateParsing &&
@@ -974,6 +987,10 @@ Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
   } else
     Actions.ActOnDefaultCtorInitializers(Res);
 
+  // Late attributes are parsed in the same scope as the function body.
+  if (LateParsedAttrs)
+    ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
+
   return ParseFunctionStatementBody(Res, BodyScope);
 }