Fix class/function parsing in single-statement blocks (#3179)

This patch fixes #3151 and fixes #3174.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/parser/js/js-parser-statm.c

@@ -2338,7 +2338,7 @@ parser_parse_statements (parser_context_t *context_p) /**< context */
       case LEXER_KEYW_CLASS:
       {
         parser_parse_class (context_p, true);
-        continue;
+        goto consume_last_statement;
       }
 #endif /* ENABLED (JERRY_ES2015_CLASS) */
 
@@ -2359,7 +2359,7 @@ parser_parse_statements (parser_context_t *context_p) /**< context */
       case LEXER_KEYW_FUNCTION:
       {
         parser_parse_function_statement (context_p);
-        continue;
+        goto consume_last_statement;
       }
 
       case LEXER_KEYW_IF:
@@ -2665,6 +2665,7 @@ parser_parse_statements (parser_context_t *context_p) /**< context */
       parser_raise_error (context_p, PARSER_ERR_SEMICOLON_EXPECTED);
     }
 
+consume_last_statement:
     while (true)
     {
       switch (context_p->stack_top_uint8)

tests/jerry/es2015/regression-test-issue-3151-class.js

@@ -0,0 +1,15 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+do class $ { } while (0);

tests/jerry/fail/regression-test-issue-3174.js

@@ -0,0 +1,17 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+if ($)
+    function $ ( ) { };
+else if ( b ) c

tests/jerry/regression-test-issue-3151-function.js

@@ -0,0 +1,15 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+do function $ ( ) { } while (0);