Add if_else.js test. Fix bytecode generation.

src/libjsparser/parser.c

@@ -2145,16 +2145,24 @@ parse_if_statement (void)
   skip_newlines ();
   parse_statement ();
 
-  REWRITE_COND_JMP (HEAD (U16, 1), is_false_jmp_down, OPCODE_COUNTER () - HEAD (U16, 1));
-
   skip_newlines ();
   if (is_keyword (KW_ELSE))
   {
+    PUSH (U16, OPCODE_COUNTER ());
+    DUMP_OPCODE_2 (jmp_down, INVALID_VALUE, INVALID_VALUE);
+
+    REWRITE_COND_JMP (HEAD (U16, 2), is_false_jmp_down, OPCODE_COUNTER () - HEAD (U16, 2));
+
     skip_newlines ();
     parse_statement ();
+
+    REWRITE_JMP (HEAD (U16, 1), jmp_down, OPCODE_COUNTER () - HEAD (U16, 1));
+
+    DROP (U16, 1);
   }
   else
   {
+    REWRITE_COND_JMP (HEAD (U16, 1), is_false_jmp_down, OPCODE_COUNTER () - HEAD (U16, 1));
     lexer_save_token (TOK ());
   }
 

tests/jerry/if_else.js

@@ -0,0 +1,35 @@
+// Copyright 2014 Samsung Electronics Co., Ltd.
+//
+// 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.
+
+var was_then = false, was_else = false;
+
+if (true) {
+  was_then = true;
+} else {
+  was_else = true;
+}
+
+assert (was_then && !was_else);
+
+was_then = false;
+was_else = false;
+
+if (false) {
+  was_then = true;
+} else {
+  was_else = true;
+}
+
+assert (was_else && !was_then);
+