Validate that throws clauses in Thrift contain only exceptions

Summary: Throwing non-exceptions, though allowed in some languages, is a weird concept and causes problems in many places. Disallow it in the Thrift compiler and throw an informative error.

Reviewed By: dreiss

Test Plan: Generate a file with an int or something in a throws clause. Peep the nice informative compiler error.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665450 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/compiler/cpp/src/thrifty.yy b/compiler/cpp/src/thrifty.yy
index 2b09972..0b87386 100644
--- a/compiler/cpp/src/thrifty.yy
+++ b/compiler/cpp/src/thrifty.yy
@@ -766,6 +766,10 @@
     {
       pdebug("Throws -> tok_throws ( FieldList )");
       $$ = $3;
+      if (!validate_throws($$)) {
+        yyerror("Throws clause may not contain non-exception types");
+        exit(1);
+      }
     }
 |
     {