Add retval opcode handler.

src/libcoreint/interpreter.c

@@ -182,7 +182,7 @@ try_get_string_by_idx (T_IDX idx, /**< literal id */
   JERRY_ASSERT (str_p != NULL);
 
   FIXME (ecma_char_t strlen);
-  
+
   ssize_t req_length = (ssize_t)__strlen ((const char*)str_p) + 1;
 
   if (buffer_size < req_length)

src/libcoreint/opcodes.c

@@ -431,7 +431,6 @@ do_number_bitwise_logic (struct __int_data *int_data, /**< interpreter context *
     op (native_call)                     \
     op (func_decl_n)                     \
     op (varg_list)                       \
-    op (retval)                          \
     op (construct_decl)                  \
     op (array_decl)                      \
     op (prop)                            \
@@ -1894,6 +1893,31 @@ opfunc_ret (OPCODE opdata __unused, /**< operation data */
                                      ECMA_TARGET_ID_RESERVED);
 } /* opfunc_ret */
 
+/**
+ * 'Return with expression' opcode handler.
+ *
+ * See also: ECMA-262 v5, 12.9
+ *
+ * @return completion value
+ *         Returned value is simple and so need not be freed.
+ *         However, ecma_free_completion_value may be called for it, but it is a no-op.
+ */
+ecma_completion_value_t
+opfunc_retval (OPCODE opdata __unused, /**< operation data */
+               struct __int_data *int_data __unused) /**< interpreter context */
+{
+  ecma_completion_value_t ret_value;
+
+  ECMA_TRY_CATCH (expr_val, get_variable_value (int_data, opdata.data.retval.ret_value, false), ret_value);
+
+  ret_value = ecma_make_completion_value (ECMA_COMPLETION_TYPE_RETURN,
+                                          expr_val.value,
+                                          ECMA_TARGET_ID_RESERVED);
+
+  ECMA_FINALIZE (expr_val);
+  return ret_value;
+} /* opfunc_retval */
+
 /**
  * 'Property getter' opcode handler.
  *

tests/jerry/N.function_return.js

@@ -0,0 +1,33 @@
+// 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.
+
+function f_empty()
+{
+  return;
+}
+
+function f_42()
+{
+  return 42;
+}
+
+function f_expr()
+{
+  var a = 5;
+  var b = 5;
+  return a + b;
+}
+
+assert(f_expr() === 10);
+assert(f_42() === 42);