C++: Add parser support for @throw statements.

Change-Id: I366733ec821ee264f182f4d4a3cf69cdada20cfc
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -335,6 +335,7 @@ bool Parser::skipUntilStatement()
 
             case T_AT_TRY:
             case T_AT_SYNCHRONIZED:
+            case T_AT_THROW:
                 if (objCEnabled())
                     return true;
 
@@ -3113,6 +3114,9 @@ bool Parser::parseStatement(StatementAST *&node)
     case T_AT_SYNCHRONIZED:
         return objCEnabled() && parseObjCSynchronizedStatement(node);
 
+    case T_AT_THROW:
+        return objCEnabled() && parseObjCThrowStatement(node);
+
     case T_Q_D:
     case T_Q_Q: {
         QtMemberDeclarationAST *ast = new (_pool) QtMemberDeclarationAST;
@@ -4452,6 +4456,8 @@ bool Parser::parseObjCTryStatement(StatementAST *& /*node*/)
     return true;
 }
 
+/// objc-synchronized-statement:
+///   @synchronized expression ;
 bool Parser::parseObjCSynchronizedStatement(StatementAST *&node)
 {
     DEBUG_THIS_RULE();
@@ -4470,6 +4476,23 @@ bool Parser::parseObjCSynchronizedStatement(StatementAST *&node)
     return true;
 }
 
+/// objc-throw-statement:
+///   @ throw expression ;
+bool Parser::parseObjCThrowStatement(StatementAST *&/*node*/)
+{
+    DEBUG_THIS_RULE();
+    if (LA() != T_AT_THROW)
+        return false;
+
+    /*throw_token =*/ consumeToken();
+    ExpressionAST *thrown_expression;
+    parseExpression(thrown_expression);
+    unsigned semicolon_token;
+    match(T_SEMICOLON, &semicolon_token);
+
+    return true;
+}
+
 bool Parser::parseObjCEncodeExpression(ExpressionAST *&node)
 {
     DEBUG_THIS_RULE();

src/libs/3rdparty/cplusplus/Parser.h

@@ -224,6 +224,7 @@ public:
 
     bool parseObjCTryStatement(StatementAST *&node);
     bool parseObjCSynchronizedStatement(StatementAST *&node);
+    bool parseObjCThrowStatement(StatementAST *&node);
     bool parseObjCEncodeExpression(ExpressionAST *&node);
     bool parseObjCProtocolExpression(ExpressionAST *&node);
     bool parseObjCSelectorExpression(ExpressionAST *&node);

tests/auto/cplusplus/ast/tst_ast.cpp

@@ -162,6 +162,7 @@ private slots:
     void objc_try_statement_1();
     void objc_try_statement_2();
     void objc_try_statement_3();
+    void objc_throw_statement();
 
     // expressions with (square) brackets
     void normal_array_access();
@@ -1437,6 +1438,22 @@ void tst_AST::objc_try_statement_3()
     QCOMPARE(diag.errorCount, 0);
 }
 
+void tst_AST::objc_throw_statement()
+{
+    QSharedPointer<TranslationUnit> unit(
+                parseDeclaration(
+                    "void tst() {\n"
+                    "    NSException *up = [NSException exceptionWithName:@\"NoException\"\n"
+                    "                                              reason:@\"No Reason :-)\"\n"
+                    "                                            userInfo:nil];\n"
+                    "    @throw up;\n"
+                    "}\n"
+                    ));
+    AST *ast = unit->ast();
+    QVERIFY(ast);
+    QCOMPARE(diag.errorCount, 0);
+}
+
 void tst_AST::normal_array_access()
 {
     QSharedPointer<TranslationUnit> unit(parseDeclaration("\n"