diff --git a/Makefile b/Makefile
index 321913982..c78fe29f7 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,12 @@ export FLASH_TARGETS = $(foreach __TARGET,$(foreach __MODE,$(TARGET_MODES),$(for
 export OUT_DIR = ./out
 export UNITTESTS_SRC_DIR = ./tests/unit
 
+export SHELL=/bin/bash
+
 export dwarf4
+export echo
+export todo
+export fixme
 
 all: clean $(JERRY_TARGETS) $(TESTS_TARGET) $(CHECK_TARGETS)
 
diff --git a/Makefile.mak b/Makefile.mak
index 12da6997a..688a3964e 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -53,6 +53,26 @@ else
     OPTION_DWARF4 := disable
 endif
 
+# Print TODO, FIXME
+ifeq ($(todo),1)
+    OPTION_TODO := enable
+else
+    OPTION_TODO := disable
+endif
+
+ifeq ($(fixme),1)
+    OPTION_FIXME := enable
+else
+    OPTION_FIXME := disable
+endif
+
+# Compilation command line echoing
+ifeq ($(echo),1)
+     OPTION_ECHO := enable
+else
+     OPTION_ECHO := disable
+endif
+
 # JERRY_NDEBUG, debug symbols
 ifeq ($(TARGET_MODE),release)
  OPTION_NDEBUG = enable
@@ -200,6 +220,14 @@ else
  DEFINES_JERRY += -D__TARGET_MCU
 endif
 
+ifeq ($(OPTION_TODO),enable)
+ DEFINES_JERRY += -DJERRY_PRINT_TODO
+endif
+
+ifeq ($(OPTION_FIXME),enable)
+ DEFINES_JERRY += -DJERRY_PRINT_FIXME
+endif
+
 #
 # Third-party sources, headers, includes, cflags, ldflags
 #
@@ -241,6 +269,7 @@ $(JERRY_TARGETS):
 	for jerry_src in $(SOURCES_JERRY) $(MAIN_MODULE_SRC); do \
 		cmd="$(CC) -c $(DEFINES_JERRY) $(CFLAGS_COMMON) $(CFLAGS_JERRY) $(INCLUDES_JERRY) $(INCLUDES_THIRDPARTY) $$jerry_src \
                      -o $(TARGET_DIR)/obj/$$(basename $$jerry_src).$$source_index.o"; \
+                if [ "$(OPTION_ECHO)" = "enable" ]; then echo $$cmd; echo; fi; \
 		$$cmd; \
 		if [ $$? -ne 0 ]; then echo Failed "'$$cmd'"; exit 1; fi; \
 		source_index=$$(($$source_index+1)); \
@@ -248,11 +277,13 @@ $(JERRY_TARGETS):
 	for thirdparty_src in $(SOURCES_THIRDPARTY); do \
 		cmd="$(CC) -c $(CFLAGS_COMMON) $(CFLAGS_THIRDPARTY) $(INCLUDES_THIRDPARTY) $$thirdparty_src \
                      -o $(TARGET_DIR)/obj/$$(basename $$thirdparty_src).$$source_index.o"; \
+                if [ "$(OPTION_ECHO)" = "enable" ]; then echo $$cmd; echo; fi; \
 		$$cmd; \
 		if [ $$? -ne 0 ]; then echo Failed "'$$cmd'"; exit 1; fi; \
 		source_index=$$(($$source_index+1)); \
 	done; \
 	cmd="$(CC) $(CFLAGS_COMMON) $(TARGET_DIR)/obj/* $(LDFLAGS) -o $(TARGET_DIR)/$(ENGINE_NAME)"; \
+        if [ "$(OPTION_ECHO)" = "enable" ]; then echo $$cmd; echo; fi; \
 	$$cmd; \
 	if [ $$? -ne 0 ]; then echo Failed "'$$cmd'"; exit 1; fi;
 	@if [ "$(OPTION_STRIP)" = "enable" ]; then $(STRIP) $(TARGET_DIR)/$(ENGINE_NAME) || exit $$?; fi;
@@ -268,8 +299,7 @@ $(TESTS_TARGET):
         do \
                 cmd="$(CC) -c $(DEFINES_JERRY) $(CFLAGS_COMMON) $(CFLAGS_JERRY) \
                 $(INCLUDES_JERRY) $(INCLUDES_THIRDPARTY) $$jerry_src -o $(TARGET_DIR)/obj/$$(basename $$jerry_src).$$source_index.o"; \
-                echo $$cmd; \
-                echo; \
+                if [ "$(option_echo)" = "enable" ]; then echo $$cmd; echo; fi; \
                 $$cmd; \
 		if [ $$? -ne 0 ]; then echo Failed "'$$cmd'"; exit 1; fi; \
 		source_index=$$(($$source_index+1)); \
@@ -278,8 +308,7 @@ $(TESTS_TARGET):
 	do \
 		cmd="$(CC) $(DEFINES_JERRY) $(CFLAGS_COMMON) $(CFLAGS_JERRY) \
 		$(INCLUDES_JERRY) $(INCLUDES_THIRDPARTY) $(TARGET_DIR)/obj/*.o $(UNITTESTS_SRC_DIR)/$$unit_test.c -o $(TARGET_DIR)/$$unit_test"; \
-        echo $$cmd; \
-        echo; \
+                if [ "$(OPTION_ECHO)" = "enable" ]; then echo $$cmd; echo; fi; \
 		$$cmd; \
 		if [ $$? -ne 0 ]; then echo Failed "'$$cmd'"; exit 1; fi; \
 	done
diff --git a/benchmarks/jerry/loop_demo.js b/benchmarks/jerry/loop_demo.js
new file mode 100644
index 000000000..b12eaafa2
--- /dev/null
+++ b/benchmarks/jerry/loop_demo.js
@@ -0,0 +1,125 @@
+// 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 tmp, a, b = 1, c = 2, d, e = 3, g = 4;
+
+var count = 1000;
+
+tmp = b * c;
+a = tmp + g;
+d = tmp * e + a;
+
+var waitTime = 600000;
+var numOfIterations = 10;
+
+while (1)
+{
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    LEDOn(13);
+    LEDOn(14);
+    LEDOn(15);
+    wait(waitTime * 2);
+    LEDOff(12);
+    LEDOff(13);
+    LEDOff(14);
+    LEDOff(15);
+    wait(waitTime * 2);
+  }
+
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    wait(waitTime);
+    LEDOff(12);
+    wait(waitTime);
+    LEDOn(13);
+    wait(waitTime);
+    LEDOff(13);
+    wait(waitTime);
+    LEDOn(14);
+    wait(waitTime);
+    LEDOff(14);
+    wait(waitTime);
+    LEDOn(15);
+    wait(waitTime);
+    LEDOff(15);
+    wait(waitTime);
+  }
+
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    wait(waitTime);
+    LEDOff(12);
+    LEDOn(13);
+    wait(waitTime);
+    LEDOff(13);
+    LEDOn(14);
+    wait(waitTime);
+    LEDOff(14);
+    LEDOn(15);
+    wait(waitTime);
+    LEDOff(15);
+  }
+
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    wait(waitTime / 2);
+    LEDOff(12);
+    LEDOn(13);
+    wait(waitTime / 2);
+    LEDOff(13);
+    LEDOn(14);
+    wait(waitTime / 2);
+    LEDOff(14);
+    LEDOn(15);
+    wait(waitTime / 2);
+    LEDOff(15);
+  }
+
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    wait(waitTime / 3);
+    LEDOff(12);
+    LEDOn(13);
+    wait(waitTime / 3);
+    LEDOff(13);
+    LEDOn(14);
+    wait(waitTime / 3);
+    LEDOff(14);
+    LEDOn(15);
+    wait(waitTime / 3);
+    LEDOff(15);
+  }
+
+  for (var j = 0; j < numOfIterations; j += 1)
+  {
+    LEDOn(12);
+    wait(waitTime / 6);
+    LEDOff(12);
+    LEDOn(13);
+    wait(waitTime / 6);
+    LEDOff(13);
+    LEDOn(14);
+    wait(waitTime / 6);
+    LEDOff(14);
+    LEDOn(15);
+    wait(waitTime / 6);
+    LEDOff(15);
+  }
+}
diff --git a/src/generated.h b/src/generated.h
index e7918c72d..c46ac9190 100644
--- a/src/generated.h
+++ b/src/generated.h
@@ -16,25 +16,115 @@
 #include "globals.h"
 
 static const char* generated_source = ""
-        "var tmp, a, b = 1, c = 2, d, e = 3, g = 4;\n"
-        "var count = 10000*10000;\n"
-        "for (var i = 0; i < count; i += 1)\n"
-        "{\n"
-        "  tmp = b * c;\n"
-        "  a = tmp + g;\n"
-        "  d = tmp * e;\n"
-        "\n"
-        "  if (i % 1000 == 0) \n"
-        "  { \n"
-        "    LEDOn (12);\n"
-        "    LEDOn (13);\n"
-        "    LEDOn (14);\n"
-        "    LEDOn (15);\n"
-        "    wait (300000);\n"
-        "    LEDOff (12);\n"
-        "    LEDOff (13);\n"
-        "    LEDOff (14);\n"
-        "    LEDOff (15);\n"
-        "  }\n"
-        "}\n"
-        ;
+"var tmp, a, b = 1, c = 2, d, e = 3, g = 4;\n"
+"\n"
+"var count = 1000;\n"
+"\n"
+"tmp = b * c;\n"
+"a = tmp + g;\n"
+"d = tmp * e + a;\n"
+"\n"
+"var waitTime = 600000;\n"
+"var numOfIterations = 10;\n"
+"\n"
+"while (1)\n"
+"{\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"LEDOn(13);\n"
+"LEDOn(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime * 2);\n"
+"LEDOff(12);\n"
+"LEDOff(13);\n"
+"LEDOff(14);\n"
+"LEDOff(15);\n"
+"wait(waitTime * 2);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime);\n"
+"LEDOff(12);\n"
+"wait(waitTime);\n"
+"LEDOn(13);\n"
+"wait(waitTime);\n"
+"LEDOff(13);\n"
+"wait(waitTime);\n"
+"LEDOn(14);\n"
+"wait(waitTime);\n"
+"LEDOff(14);\n"
+"wait(waitTime);\n"
+"LEDOn(15);\n"
+"wait(waitTime);\n"
+"LEDOff(15);\n"
+"wait(waitTime);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(15);\n"
+"}\n"
+"}\n"
+;
diff --git a/src/globals.h b/src/globals.h
index e8e2bd8df..e777be880 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -70,8 +70,18 @@ typedef enum
 #define JERRY_STATIC_ASSERT( x ) typedef char JERRY_STATIC_ASSERT_GLUE( static_assertion_failed_, __LINE__) [ ( x ) ? 1 : -1 ] __unused
 
 #define CALL_PRAGMA(x) _Pragma (#x)
-#define TODO(x) CALL_PRAGMA(message ("TODO - " #x))
-#define FIXME(x) CALL_PRAGMA(message ("FIXME - " #x))
+
+#ifdef JERRY_PRINT_TODO
+# define TODO(x) CALL_PRAGMA(message ("TODO - " #x))
+#else /* !JERRY_PRINT_TODO */
+# define TODO(X)
+#endif /* !JERRY_PRINT_TODO */
+
+#ifdef JERRY_PRINT_FIXME
+# define FIXME(x) CALL_PRAGMA(message ("FIXME - " #x))
+#else /* !JERRY_PRINT_FIXME */
+# define FIXME(X)
+#endif /* !JERRY_PRINT_FIXME */
 
 /**
  * Variable that must not be referenced.
diff --git a/src/libcoreint/interpreter.c b/src/libcoreint/interpreter.c
index dfc9a8b3b..d3bc21132 100644
--- a/src/libcoreint/interpreter.c
+++ b/src/libcoreint/interpreter.c
@@ -127,8 +127,7 @@ run_int_from_pos (int start_pos,
           completion = __opfuncs[curr->op_idx](*curr, &int_data);
 
           JERRY_ASSERT( !ecma_is_completion_value_normal( completion)
-                        || ecma_is_completion_value_normal_simple_value(completion,
-                                                                        ECMA_SIMPLE_VALUE_EMPTY) );
+                        || ecma_is_empty_completion_value( completion) );
         } while ( completion.type == ECMA_COMPLETION_TYPE_NORMAL );
 
       if ( completion.type == ECMA_COMPLETION_TYPE_BREAK )
diff --git a/src/libcoreint/opcodes.c b/src/libcoreint/opcodes.c
index feedc7fd0..e9161574f 100644
--- a/src/libcoreint/opcodes.c
+++ b/src/libcoreint/opcodes.c
@@ -912,8 +912,7 @@ opfunc_pre_incr(OPCODE opdata, /**< operation data */
   ecma_completion_value_t reg_assignment_res = set_variable_value (int_data,
                                                                    dst_var_idx,
                                                                    new_num_value);
-  JERRY_ASSERT( ecma_is_completion_value_normal_simple_value (reg_assignment_res,
-                                                              ECMA_SIMPLE_VALUE_EMPTY) );
+  JERRY_ASSERT( ecma_is_empty_completion_value( reg_assignment_res) );
 
   ecma_dealloc_number( new_num_p);
 
@@ -963,8 +962,7 @@ opfunc_pre_decr(OPCODE opdata, /**< operation data */
   ecma_completion_value_t reg_assignment_res = set_variable_value (int_data,
                                                                    dst_var_idx,
                                                                    new_num_value);
-  JERRY_ASSERT( ecma_is_completion_value_normal_simple_value (reg_assignment_res,
-                                                              ECMA_SIMPLE_VALUE_EMPTY) );
+  JERRY_ASSERT( ecma_is_empty_completion_value (reg_assignment_res) );
 
   ecma_dealloc_number( new_num_p);
 
@@ -1014,8 +1012,7 @@ opfunc_post_incr(OPCODE opdata, /**< operation data */
   ecma_completion_value_t reg_assignment_res = set_variable_value (int_data,
                                                                    dst_var_idx,
                                                                    old_value.value);
-  JERRY_ASSERT( ecma_is_completion_value_normal_simple_value (reg_assignment_res,
-                                                              ECMA_SIMPLE_VALUE_EMPTY) );
+  JERRY_ASSERT( ecma_is_empty_completion_value( reg_assignment_res) );
 
   ECMA_FINALIZE(old_num_value);
   ECMA_FINALIZE(old_value);
@@ -1063,8 +1060,7 @@ opfunc_post_decr(OPCODE opdata, /**< operation data */
   ecma_completion_value_t reg_assignment_res = set_variable_value (int_data,
                                                                    dst_var_idx,
                                                                    old_value.value);
-  JERRY_ASSERT( ecma_is_completion_value_normal_simple_value (reg_assignment_res,
-                                                              ECMA_SIMPLE_VALUE_EMPTY) );
+  JERRY_ASSERT( ecma_is_empty_completion_value (reg_assignment_res) );
 
   ECMA_FINALIZE(old_num_value);
   ECMA_FINALIZE(old_value);
diff --git a/src/libecmaobjects/ecma-globals.h b/src/libecmaobjects/ecma-globals.h
index b1d98b3c6..40464cfd6 100644
--- a/src/libecmaobjects/ecma-globals.h
+++ b/src/libecmaobjects/ecma-globals.h
@@ -63,12 +63,18 @@ typedef enum {
  * Simple ecma-values
  */
 typedef enum {
-    ECMA_SIMPLE_VALUE_EMPTY, /**< empty value (see also: ECMA-262 v5, 8.9 Completion specification type) */
+    /**
+     * Empty value is implementation defined value, used for:
+     *   - representing empty value in completion values (see also: ECMA-262 v5, 8.9 Completion specification type);
+     *   - values of uninitialized immutable bindings;
+     *   - values of empty register variables.
+     */
+    ECMA_SIMPLE_VALUE_EMPTY,
     ECMA_SIMPLE_VALUE_UNDEFINED, /**< undefined value */
     ECMA_SIMPLE_VALUE_NULL, /**< null value */
     ECMA_SIMPLE_VALUE_FALSE, /**< boolean false */
     ECMA_SIMPLE_VALUE_TRUE, /**< boolean true */
-    ECMA_SIMPLE_VALUE_ARRAY_REDIRECT, /**< special value for an array's elements that exists,
+    ECMA_SIMPLE_VALUE_ARRAY_REDIRECT, /**< implementation defined value for an array's elements that exists,
                                            but is stored directly in the array's property list
                                            (used for array elements with non-default attribute values) */
     ECMA_SIMPLE_VALUE__COUNT /** count of simple ecma-values */
@@ -183,7 +189,7 @@ typedef enum
 } ecma_property_configurable_value_t;
 
 /**
- * Description of ecma-property.
+ * Description of ecma-property
  */
 typedef struct ecma_property_t {
     /** Property's type (ecma_property_type_t) */
@@ -343,6 +349,54 @@ typedef struct ecma_object_t {
     ecma_gc_info_t GCInfo;
 } __packed ecma_object_t;
 
+/**
+ * Description of ECMA property descriptor
+ *
+ * See also: ECMA-262 v5, 8.10.
+ *
+ * Note:
+ *      If a component of descriptor is undefined then corresponding
+ *      field should contain it's default value.
+ */
+typedef struct
+{
+  /** Is [[Value]] defined? */
+  unsigned int is_value_defined : 1;
+
+  /** Is [[Get]] defined? */
+  unsigned int is_get_defined : 1;
+
+  /** Is [[Set]] defined? */
+  unsigned int is_set_defined : 1;
+
+  /** Is [[Writable]] defined? */
+  unsigned int is_writable_defined : 1;
+
+  /** Is [[Enumerable]] defined? */
+  unsigned int is_enumerable_defined : 1;
+
+  /** Is [[Configurable]] defined? */
+  unsigned int is_configurable_defined : 1;
+
+  /** [[Value]] */
+  ecma_value_t value;
+
+  /** [[Get]] */
+  ecma_object_t* get_p;
+
+  /** [[Set]] */
+  ecma_object_t* set_p;
+
+  /** [[Writable]] */
+  ecma_property_writable_value_t writable;
+
+  /** [[Enumerable]] */
+  ecma_property_enumerable_value_t enumerable;
+
+  /** [[Configurable]] */
+  ecma_property_configurable_value_t configurable;
+} ecma_property_descriptor_t;
+
 /**
  * Description of an ecma-character
  */
diff --git a/src/libecmaobjects/ecma-helpers-value.c b/src/libecmaobjects/ecma-helpers-value.c
index efa0a1155..f02e1a7a0 100644
--- a/src/libecmaobjects/ecma-helpers-value.c
+++ b/src/libecmaobjects/ecma-helpers-value.c
@@ -282,6 +282,24 @@ ecma_make_completion_value(ecma_completion_type_t type, /**< type */
   return (ecma_completion_value_t) { .type = type, .value = value, .target = target };
 } /* ecma_make_completion_value */
 
+/**
+ * Simple normal completion value constructor
+ *
+ * @return completion value
+ */
+ecma_completion_value_t
+ecma_make_simple_completion_value( ecma_simple_value_t simple_value) /**< simple ecma-value */
+{
+  JERRY_ASSERT( simple_value == ECMA_SIMPLE_VALUE_UNDEFINED
+                || simple_value == ECMA_SIMPLE_VALUE_NULL
+                || simple_value == ECMA_SIMPLE_VALUE_FALSE
+                || simple_value == ECMA_SIMPLE_VALUE_TRUE );
+
+  return ecma_make_completion_value( ECMA_COMPLETION_TYPE_NORMAL,
+                                     ecma_make_simple_value( simple_value),
+                                     ECMA_TARGET_ID_RESERVED);
+} /* ecma_make_simple_completion_value */
+
 /**
  * Throw completion value constructor.
  *
@@ -308,8 +326,8 @@ ecma_completion_value_t
 ecma_make_empty_completion_value( void)
 {
   return ecma_make_completion_value( ECMA_COMPLETION_TYPE_NORMAL,
-                                   ecma_make_simple_value( ECMA_SIMPLE_VALUE_EMPTY),
-                                   ECMA_TARGET_ID_RESERVED);
+                                     ecma_make_simple_value( ECMA_SIMPLE_VALUE_EMPTY),
+                                     ECMA_TARGET_ID_RESERVED);
 } /* ecma_make_empty_completion_value */
 
 /**
@@ -321,8 +339,8 @@ ecma_completion_value_t
 ecma_copy_completion_value( ecma_completion_value_t value) /**< completion value */
 {
   return ecma_make_completion_value( value.type,
-                                   ecma_copy_value( value.value),
-                                   value.target);
+                                     ecma_copy_value( value.value),
+                                     value.target);
 } /* ecma_copy_completion_value */
 
 /**
@@ -412,6 +430,20 @@ ecma_is_completion_value_normal_false( ecma_completion_value_t value) /**< compl
   return ecma_is_completion_value_normal_simple_value( value, ECMA_SIMPLE_VALUE_FALSE);
 } /* ecma_is_completion_value_normal_false */
 
+/**
+ * Check if the completion value is normal empty value.
+ *
+ * @return true - if the completion type is normal and
+ *                value contains empty simple value,
+ *         false - otherwise.
+ */
+bool
+ecma_is_empty_completion_value( ecma_completion_value_t value) /**< completion value */
+{
+  return ( ecma_is_completion_value_normal( value)
+           && ecma_is_value_empty( value.value) );
+} /* ecma_is_empty_completion_value */
+
 /**
  * @}
  * @}
diff --git a/src/libecmaobjects/ecma-helpers.c b/src/libecmaobjects/ecma-helpers.c
index 2ffa90248..3b5148f8b 100644
--- a/src/libecmaobjects/ecma-helpers.c
+++ b/src/libecmaobjects/ecma-helpers.c
@@ -208,11 +208,11 @@ ecma_get_internal_property(ecma_object_t *object_p, /**< object descriptor */
  * @return pointer to newly created property
  */
 ecma_property_t*
-ecma_create_named_property(ecma_object_t *obj_p, /**< object */
-                         ecma_char_t *name_p, /**< property name */
-                         ecma_property_writable_value_t writable, /**< 'writable' attribute */
-                         ecma_property_enumerable_value_t enumerable, /**< 'enumerable' attribute */
-                         ecma_property_configurable_value_t configurable) /**< 'configurable' attribute */
+ecma_create_named_data_property(ecma_object_t *obj_p, /**< object */
+                                ecma_char_t *name_p, /**< property name */
+                                ecma_property_writable_value_t writable, /**< 'writable' attribute */
+                                ecma_property_enumerable_value_t enumerable, /**< 'enumerable' attribute */
+                                ecma_property_configurable_value_t configurable) /**< 'configurable' attribute */
 {
   JERRY_ASSERT( obj_p != NULL && name_p != NULL );
 
@@ -232,7 +232,40 @@ ecma_create_named_property(ecma_object_t *obj_p, /**< object */
   ecma_set_pointer( obj_p->properties_p, prop);
 
   return prop;
-} /* ecma_create_named_property */
+} /* ecma_create_named_data_property */
+
+/**
+ * Create named accessor property with given name, attributes, getter and setter.
+ *
+ * @return pointer to newly created property
+ */
+ecma_property_t*
+ecma_create_named_accessor_property(ecma_object_t *obj_p, /**< object */
+                                    ecma_char_t *name_p, /**< property name */
+                                    ecma_object_t *get_p, /**< getter */
+                                    ecma_object_t *set_p, /**< setter */
+                                    ecma_property_enumerable_value_t enumerable, /**< 'enumerable' attribute */
+                                    ecma_property_configurable_value_t configurable) /**< 'configurable' attribute */
+{
+  JERRY_ASSERT( obj_p != NULL && name_p != NULL );
+
+  ecma_property_t *prop_p = ecma_alloc_property();
+
+  prop_p->type = ECMA_PROPERTY_NAMEDACCESSOR;
+
+  ecma_set_pointer( prop_p->u.named_accessor_property.name_p, ecma_new_ecma_string( name_p));
+
+  ecma_set_pointer( prop_p->u.named_accessor_property.get_p, get_p);
+  ecma_set_pointer( prop_p->u.named_accessor_property.set_p, set_p);
+
+  prop_p->u.named_accessor_property.enumerable = enumerable;
+  prop_p->u.named_accessor_property.configurable = configurable;
+
+  ecma_set_pointer( prop_p->next_property_p, ecma_get_pointer( obj_p->properties_p));
+  ecma_set_pointer( obj_p->properties_p, prop_p);
+
+  return prop_p;
+} /* ecma_create_named_accessor_property */
 
 /**
  * Find named data property or named access property in specified object.
diff --git a/src/libecmaobjects/ecma-helpers.h b/src/libecmaobjects/ecma-helpers.h
index a72e84bec..70e608363 100644
--- a/src/libecmaobjects/ecma-helpers.h
+++ b/src/libecmaobjects/ecma-helpers.h
@@ -56,6 +56,7 @@ extern ecma_value_t ecma_copy_value( const ecma_value_t value);
 extern void ecma_free_value( const ecma_value_t value);
 
 extern ecma_completion_value_t ecma_make_completion_value( ecma_completion_type_t type, ecma_value_t value, uint8_t target);
+extern ecma_completion_value_t ecma_make_simple_completion_value( ecma_simple_value_t simple_value);
 extern ecma_completion_value_t ecma_make_throw_value( ecma_object_t *exception_p);
 extern ecma_completion_value_t ecma_make_empty_completion_value( void);
 extern ecma_completion_value_t ecma_copy_completion_value( ecma_completion_value_t value);
@@ -64,8 +65,9 @@ extern void ecma_free_completion_value( ecma_completion_value_t completion_value
 extern bool ecma_is_completion_value_normal( ecma_completion_value_t value);
 extern bool ecma_is_completion_value_throw( ecma_completion_value_t value);
 extern bool ecma_is_completion_value_normal_simple_value( ecma_completion_value_t value, ecma_simple_value_t simple_value);
-extern bool ecma_is_completion_value_normal_false( ecma_completion_value_t value);
 extern bool ecma_is_completion_value_normal_true( ecma_completion_value_t value);
+extern bool ecma_is_completion_value_normal_false( ecma_completion_value_t value);
+extern bool ecma_is_empty_completion_value( ecma_completion_value_t value);
 
 extern ecma_object_t* ecma_create_object( ecma_object_t *prototype_object_p, bool is_extensible);
 extern ecma_object_t* ecma_create_lexical_environment( ecma_object_t *outer_lexical_environment_p, ecma_lexical_environment_type_t type);
@@ -75,7 +77,8 @@ extern ecma_property_t* ecma_create_internal_property(ecma_object_t *object_p, e
 extern ecma_property_t* ecma_find_internal_property(ecma_object_t *object_p, ecma_internal_property_id_t property_id);
 extern ecma_property_t* ecma_get_internal_property(ecma_object_t *object_p, ecma_internal_property_id_t property_id);
 
-extern ecma_property_t *ecma_create_named_property(ecma_object_t *obj_p, ecma_char_t *name_p, ecma_property_writable_value_t writable, ecma_property_enumerable_value_t enumerable, ecma_property_configurable_value_t configurable);
+extern ecma_property_t *ecma_create_named_data_property(ecma_object_t *obj_p, ecma_char_t *name_p, ecma_property_writable_value_t writable, ecma_property_enumerable_value_t enumerable, ecma_property_configurable_value_t configurable);
+extern ecma_property_t *ecma_create_named_accessor_property(ecma_object_t *obj_p, ecma_char_t *name_p, ecma_object_t *get_p, ecma_object_t *set_p, ecma_property_enumerable_value_t enumerable, ecma_property_configurable_value_t configurable);
 extern ecma_property_t *ecma_find_named_property(ecma_object_t *obj_p, ecma_char_t *name_p);
 extern ecma_property_t *ecma_get_named_property(ecma_object_t *obj_p, ecma_char_t *name_p);
 extern ecma_property_t *ecma_get_named_data_property(ecma_object_t *obj_p, ecma_char_t *name_p);
diff --git a/src/libecmaoperations/ecma-conversion.c b/src/libecmaoperations/ecma-conversion.c
index 6ddcd6b6f..678670e5a 100644
--- a/src/libecmaoperations/ecma-conversion.c
+++ b/src/libecmaoperations/ecma-conversion.c
@@ -44,25 +44,18 @@ ecma_op_check_object_coercible( ecma_value_t value) /**< ecma-value */
   {
     case ECMA_TYPE_SIMPLE:
       {
-        switch ( (ecma_simple_value_t)value.value )
-        {
-          case ECMA_SIMPLE_VALUE_UNDEFINED:
-          case ECMA_SIMPLE_VALUE_NULL:
-            {
-              return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
-            }
-          case ECMA_SIMPLE_VALUE_FALSE:
-          case ECMA_SIMPLE_VALUE_TRUE:
-            {
-              break;
-            }
-          case ECMA_SIMPLE_VALUE_EMPTY:
-          case ECMA_SIMPLE_VALUE_ARRAY_REDIRECT:
-          case ECMA_SIMPLE_VALUE__COUNT:
-            {
-              JERRY_UNREACHABLE();
-            }
-        }
+        if ( ecma_is_value_undefined( value) )
+          {
+            return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
+          }
+        else if ( ecma_is_value_boolean( value) )
+          {
+            break;
+          }
+        else
+          {
+            JERRY_UNREACHABLE();
+          }
 
         break;
       }
@@ -81,6 +74,79 @@ ecma_op_check_object_coercible( ecma_value_t value) /**< ecma-value */
   return ecma_make_empty_completion_value();
 } /* ecma_op_check_object_coercible */
 
+/**
+ * SameValue operation.
+ *
+ * See also:
+ *          ECMA-262 v5, 9.12
+ *
+ * @return true - if the value are same according to ECMA-defined SameValue algorithm,
+ *         false - otherwise.
+ */
+bool
+ecma_op_same_value( ecma_value_t x, /**< ecma-value */
+                    ecma_value_t y) /**< ecma-value */
+{
+  const bool is_x_undefined = ecma_is_value_undefined( x);
+  const bool is_x_null = ecma_is_value_null( x);
+  const bool is_x_boolean = ecma_is_value_boolean( x);
+  const bool is_x_number = ( x.value_type == ECMA_TYPE_NUMBER );
+  const bool is_x_string = ( x.value_type == ECMA_TYPE_STRING );
+  const bool is_x_object = ( x.value_type == ECMA_TYPE_OBJECT );
+
+  const bool is_y_undefined = ecma_is_value_undefined( y);
+  const bool is_y_null = ecma_is_value_null( y);
+  const bool is_y_boolean = ecma_is_value_boolean( y);
+  const bool is_y_number = ( y.value_type == ECMA_TYPE_NUMBER );
+  const bool is_y_string = ( y.value_type == ECMA_TYPE_STRING );
+  const bool is_y_object = ( y.value_type == ECMA_TYPE_OBJECT );
+
+  const bool is_types_equal = ( ( is_x_undefined && is_y_undefined )
+                                || ( is_x_null && is_y_null )
+                                || ( is_x_boolean && is_y_boolean )
+                                || ( is_x_number && is_y_number )
+                                || ( is_x_string && is_y_string )
+                                || ( is_x_object && is_y_object ) );
+
+  if ( !is_types_equal )
+    {
+      return false;
+    }
+
+  if ( is_x_undefined
+       || is_x_null )
+    {
+      return true;
+    }
+
+  if ( is_x_number )
+    {
+      TODO( Implement according to ECMA );
+
+      ecma_number_t *x_num_p = (ecma_number_t*)ecma_get_pointer( x.value);
+      ecma_number_t *y_num_p = (ecma_number_t*)ecma_get_pointer( y.value);
+
+      return ( *x_num_p == *y_num_p );
+    }
+
+  if ( is_x_string )
+    {
+      ecma_array_first_chunk_t* x_str_p = (ecma_array_first_chunk_t*)( ecma_get_pointer(x.value) );
+      ecma_array_first_chunk_t* y_str_p = (ecma_array_first_chunk_t*)( ecma_get_pointer(y.value) );
+
+      return ecma_compare_ecma_string_to_ecma_string( x_str_p, y_str_p);  
+    }
+
+  if ( is_x_boolean )
+    {
+      return ( ecma_is_value_true( x) == ecma_is_value_true( y) );
+    }
+
+  JERRY_ASSERT( is_x_object );
+
+  return ( ecma_get_pointer( x.value) == ecma_get_pointer( y.value) );
+} /* ecma_op_same_value */
+
 /**
  * ToPrimitive operation.
  *
@@ -130,8 +196,6 @@ ecma_op_to_primitive( ecma_value_t value, /**< ecma-value */
 ecma_completion_value_t
 ecma_op_to_boolean( ecma_value_t value) /**< ecma-value */
 {
-  ecma_simple_value_t res = ECMA_SIMPLE_VALUE_EMPTY;
-
   switch ( (ecma_type_t)value.value_type )
   {
     case ECMA_TYPE_NUMBER:
@@ -139,8 +203,9 @@ ecma_op_to_boolean( ecma_value_t value) /**< ecma-value */
         ecma_number_t *num_p = ecma_get_pointer( value.value);
 
         TODO( Implement according to ECMA );
-        res = ( *num_p == 0 ) ? ECMA_SIMPLE_VALUE_FALSE:
-                                ECMA_SIMPLE_VALUE_TRUE;
+
+        return ecma_make_simple_completion_value( ( *num_p == 0 ) ? ECMA_SIMPLE_VALUE_FALSE
+                                                                  : ECMA_SIMPLE_VALUE_TRUE );
 
         break;
       }
@@ -148,11 +213,11 @@ ecma_op_to_boolean( ecma_value_t value) /**< ecma-value */
       {
         if ( ecma_is_value_boolean (value ) )
         {
-          res = value.value;
+          return ecma_make_simple_completion_value( value.value);
         } else if ( ecma_is_value_undefined (value)
                     || ecma_is_value_null( value) )
         {
-          res = ECMA_SIMPLE_VALUE_FALSE;
+          return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
         } else
         {
           JERRY_UNREACHABLE();
@@ -164,14 +229,14 @@ ecma_op_to_boolean( ecma_value_t value) /**< ecma-value */
       {
         ecma_array_first_chunk_t *str_p = ecma_get_pointer( value.value);
 
-        res = ( str_p->header.unit_number == 0 ) ? ECMA_SIMPLE_VALUE_FALSE:
-                                                   ECMA_SIMPLE_VALUE_TRUE;
+        return ecma_make_simple_completion_value( ( str_p->header.unit_number == 0 ) ? ECMA_SIMPLE_VALUE_FALSE
+                                                                                     : ECMA_SIMPLE_VALUE_TRUE );
 
         break;
       }
     case ECMA_TYPE_OBJECT:
       {
-        res = ECMA_SIMPLE_VALUE_TRUE;
+        return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
 
         break;
       }
@@ -181,12 +246,7 @@ ecma_op_to_boolean( ecma_value_t value) /**< ecma-value */
       }
   }
 
-  JERRY_ASSERT( res == ECMA_SIMPLE_VALUE_FALSE
-                || res == ECMA_SIMPLE_VALUE_TRUE );
-
-  return ecma_make_completion_value (ECMA_COMPLETION_TYPE_NORMAL,
-                                     ecma_make_simple_value( res),
-                                     ECMA_TARGET_ID_RESERVED);
+  JERRY_UNREACHABLE();
 } /* ecma_op_to_boolean */
 
 /**
diff --git a/src/libecmaoperations/ecma-conversion.h b/src/libecmaoperations/ecma-conversion.h
index 6a85163fd..8d3bc1b9d 100644
--- a/src/libecmaoperations/ecma-conversion.h
+++ b/src/libecmaoperations/ecma-conversion.h
@@ -41,6 +41,7 @@ typedef enum
 } ecma_preferred_type_hint_t;
 
 extern ecma_completion_value_t ecma_op_check_object_coercible( ecma_value_t value);
+extern bool ecma_op_same_value( ecma_value_t x, ecma_value_t y);
 extern ecma_completion_value_t ecma_op_to_primitive( ecma_value_t value, ecma_preferred_type_hint_t preferred_type);
 extern ecma_completion_value_t ecma_op_to_boolean( ecma_value_t value);
 extern ecma_completion_value_t ecma_op_to_number( ecma_value_t value);
diff --git a/src/libecmaoperations/ecma-lex-env.c b/src/libecmaoperations/ecma-lex-env.c
index de7921f2c..1ee14312b 100644
--- a/src/libecmaoperations/ecma-lex-env.c
+++ b/src/libecmaoperations/ecma-lex-env.c
@@ -90,12 +90,12 @@ ecma_op_create_mutable_binding(ecma_object_t *lex_env_p, /**< lexical environmen
     {
       JERRY_ASSERT( ecma_is_completion_value_normal_false( ecma_op_has_binding( lex_env_p, name_p)) );
 
-      ecma_create_named_property( lex_env_p,
-                                name_p,
-                                ECMA_PROPERTY_WRITABLE,
-                                ECMA_PROPERTY_NOT_ENUMERABLE,
-                                is_deletable ? ECMA_PROPERTY_CONFIGURABLE
-                                             : ECMA_PROPERTY_NOT_CONFIGURABLE); 
+      ecma_create_named_data_property( lex_env_p,
+                                       name_p,
+                                       ECMA_PROPERTY_WRITABLE,
+                                       ECMA_PROPERTY_NOT_ENUMERABLE,
+                                       is_deletable ? ECMA_PROPERTY_CONFIGURABLE
+                                                    : ECMA_PROPERTY_NOT_CONFIGURABLE); 
 
 
       break;
@@ -186,8 +186,7 @@ ecma_op_get_binding_value(ecma_object_t *lex_env_p, /**< lexical environment */
         return ecma_make_completion_value( ECMA_COMPLETION_TYPE_NORMAL,
                                          ecma_copy_value( prop_value),
                                          ECMA_TARGET_ID_RESERVED);
-      } else if ( prop_value.value_type == ECMA_TYPE_SIMPLE
-                  && prop_value.value == ECMA_SIMPLE_VALUE_EMPTY )
+      } else if ( ecma_is_value_empty( prop_value) )
       {
         /* unitialized immutable binding */
         if ( is_strict )
@@ -317,14 +316,15 @@ ecma_op_create_immutable_binding(ecma_object_t *lex_env_p, /**< lexical environm
          * Warning:
          *         Whether immutable bindings are deletable seems not to be defined by ECMA v5.
          */
-        ecma_property_t *prop_p = ecma_create_named_property( lex_env_p,
-                                                            name_p,
-                                                            ECMA_PROPERTY_NOT_WRITABLE,
-                                                            ECMA_PROPERTY_NOT_ENUMERABLE,
-                                                            ECMA_PROPERTY_NOT_CONFIGURABLE);
+        ecma_property_t *prop_p = ecma_create_named_data_property( lex_env_p,
+                                                                   name_p,
+                                                                   ECMA_PROPERTY_NOT_WRITABLE,
+                                                                   ECMA_PROPERTY_NOT_ENUMERABLE,
+                                                                   ECMA_PROPERTY_NOT_CONFIGURABLE);
 
-        JERRY_ASSERT( prop_p->u.named_data_property.value.value_type == ECMA_TYPE_SIMPLE );
+        JERRY_ASSERT( ecma_is_value_undefined( prop_p->u.named_data_property.value ) );
 
+        prop_p->u.named_data_property.value.value_type = ECMA_TYPE_SIMPLE;
         prop_p->u.named_data_property.value.value = ECMA_SIMPLE_VALUE_EMPTY;
       }
     case ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND:
@@ -358,8 +358,7 @@ ecma_op_initialize_immutable_binding(ecma_object_t *lex_env_p, /**< lexical envi
 
         /* The binding must be unitialized immutable binding */
         JERRY_ASSERT( prop_p->u.named_data_property.writable == ECMA_PROPERTY_NOT_WRITABLE
-                      && prop_p->u.named_data_property.value.value_type == ECMA_TYPE_SIMPLE
-                      && prop_p->u.named_data_property.value.value == ECMA_SIMPLE_VALUE_EMPTY );
+                      && ecma_is_value_empty( prop_p->u.named_data_property.value) );
 
         prop_p->u.named_data_property.value = ecma_copy_value( value);
       }
diff --git a/src/libecmaoperations/ecma-objects-properties.c b/src/libecmaoperations/ecma-objects-properties.c
index 21b17175c..4648406d5 100644
--- a/src/libecmaoperations/ecma-objects-properties.c
+++ b/src/libecmaoperations/ecma-objects-properties.c
@@ -13,7 +13,9 @@
  * limitations under the License.
  */
 
+#include "ecma-exceptions.h"
 #include "ecma-globals.h"
+#include "ecma-helpers.h"
 #include "ecma-objects-properties.h"
 
 /** \addtogroup ecma ---TODO---
@@ -34,9 +36,53 @@
  */
 ecma_completion_value_t
 ecma_op_object_get( ecma_object_t *obj_p, /**< the object */
-                    ecma_array_first_chunk_t *property_name_p) /**< property name */
+                    ecma_char_t *property_name_p) /**< property name */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.3
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  // 1.
+  const ecma_property_t* prop_p = ecma_op_object_get_property( obj_p, property_name_p);
+
+  // 2.
+  if ( prop_p == NULL )
+    {
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_UNDEFINED);
+    }
+
+  // 3.
+  if ( prop_p->type == ECMA_PROPERTY_NAMEDDATA )
+    {
+      return ecma_make_completion_value( ECMA_COMPLETION_TYPE_NORMAL,
+                                         ecma_copy_value( prop_p->u.named_data_property.value),
+                                         ECMA_TARGET_ID_RESERVED);
+    }
+  else
+    {
+      // 4.
+      ecma_object_t *getter = ecma_get_pointer( prop_p->u.named_accessor_property.get_p);
+
+      // 5.
+      if ( getter == NULL )
+        {
+          return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_UNDEFINED);
+        }
+      else
+        {
+          /*
+           * Return result of O.[[Call]];
+           */
+          JERRY_UNIMPLEMENTED();
+        }
+    }
+
+  JERRY_UNREACHABLE();
 } /* ecma_op_object_get */
 
 /**
@@ -46,13 +92,22 @@ ecma_op_object_get( ecma_object_t *obj_p, /**< the object */
  *          ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
  *
  * @return pointer to a property - if it exists,
- *         NULL - otherwise.
+ *         NULL (i.e. ecma-undefined) - otherwise.
  */
 ecma_property_t*
 ecma_op_object_get_own_property( ecma_object_t *obj_p, /**< the object */
-                                 ecma_array_first_chunk_t *property_name_p) /**< property name */
+                                 ecma_char_t *property_name_p) /**< property name */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.2
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  return ecma_find_named_property( obj_p, property_name_p);
 } /* ecma_op_object_get_own_property */
 
 /**
@@ -62,13 +117,42 @@ ecma_op_object_get_own_property( ecma_object_t *obj_p, /**< the object */
  *          ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
  *
  * @return pointer to a property - if it exists,
- *         NULL - otherwise.
+ *         NULL (i.e. ecma-undefined) - otherwise.
  */
 ecma_property_t*
 ecma_op_object_get_property( ecma_object_t *obj_p, /**< the object */
-                             ecma_array_first_chunk_t *property_name_p) /**< property name */
+                             ecma_char_t *property_name_p) /**< property name */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.2
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  // 1.
+  ecma_property_t *prop_p = ecma_op_object_get_own_property( obj_p, property_name_p);
+
+  // 2.
+  if ( prop_p != NULL )
+    {
+      return prop_p;
+    }
+
+  // 3.
+  ecma_object_t *prototype_p = ecma_get_pointer( obj_p->u.object.prototype_object_p);
+
+  // 4., 5.
+  if ( prototype_p != NULL )
+    {
+      return ecma_op_object_get_property( prototype_p, property_name_p);
+    }
+  else
+    {
+      return NULL;
+    }
 } /* ecma_op_object_get_property */
 
 /**
@@ -82,11 +166,112 @@ ecma_op_object_get_property( ecma_object_t *obj_p, /**< the object */
  */
 ecma_completion_value_t
 ecma_op_object_put( ecma_object_t *obj_p, /**< the object */
-                    ecma_array_first_chunk_t *property_name_p, /**< property name */
+                    ecma_char_t *property_name_p, /**< property name */
                     ecma_value_t value, /**< ecma-value */
                     bool is_throw) /**< flag that controls failure handling */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p, value, is_throw);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  // 1.
+  if ( !ecma_op_object_can_put( obj_p, property_name_p) )
+    {
+      if ( is_throw )
+        {
+          // a.
+          return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
+        }
+      else
+        {
+          // b.
+          return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
+        }
+    }
+
+  // 2.
+  ecma_property_t *own_desc_p = ecma_op_object_get_own_property( obj_p, property_name_p);
+
+  // 3.
+  if ( own_desc_p->type == ECMA_PROPERTY_NAMEDDATA )
+    {
+      // a.
+      ecma_property_descriptor_t value_desc = (ecma_property_descriptor_t) {
+          .is_value_defined = true,
+          .value = value,
+
+          .is_get_defined = false,
+          .get_p = NULL,
+
+          .is_set_defined = false,
+          .set_p = NULL,
+
+          .is_writable_defined = false,
+          .writable = ECMA_PROPERTY_NOT_WRITABLE,
+
+          .is_enumerable_defined = false,
+          .enumerable = ECMA_PROPERTY_NOT_ENUMERABLE,
+
+          .is_configurable_defined = false,
+          .configurable = ECMA_PROPERTY_NOT_CONFIGURABLE,
+      };
+
+      // b., c.
+      return ecma_op_object_define_own_property( obj_p,
+                                                 property_name_p,
+                                                 value_desc,
+                                                 is_throw);
+    }
+
+  // 4.
+  ecma_property_t *desc_p = ecma_op_object_get_property( obj_p, property_name_p);
+
+  // 5.
+  if ( desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
+    {
+      // a.
+      ecma_object_t *setter_p = ecma_get_pointer( desc_p->u.named_accessor_property.set_p);
+
+      JERRY_ASSERT( setter_p != NULL );
+
+      // b.
+      /*
+       * setter_p->[[Call]]( obj_p, value);
+       */
+      JERRY_UNIMPLEMENTED();
+    }
+  else
+    {
+      // 6.
+
+      // a.
+      ecma_property_descriptor_t new_desc = (ecma_property_descriptor_t) {
+          .is_value_defined = true,
+          .value = value,
+
+          .is_get_defined = false,
+          .get_p = NULL,
+
+          .is_set_defined = false,
+          .set_p = NULL,
+
+          .is_writable_defined = true,
+          .writable = ECMA_PROPERTY_WRITABLE,
+
+          .is_enumerable_defined = true,
+          .enumerable = ECMA_PROPERTY_ENUMERABLE,
+
+          .is_configurable_defined = true,
+          .configurable = ECMA_PROPERTY_CONFIGURABLE
+      };
+      
+      // b.
+      return ecma_op_object_define_own_property( obj_p,
+                                                 property_name_p,
+                                                 new_desc,
+                                                 is_throw);
+    }
+
+  JERRY_UNREACHABLE();
 } /* ecma_op_object_put */
 
 /**
@@ -100,9 +285,97 @@ ecma_op_object_put( ecma_object_t *obj_p, /**< the object */
  */
 bool
 ecma_op_object_can_put( ecma_object_t *obj_p, /**< the object */
-                        ecma_array_first_chunk_t *property_name_p) /**< property name */
+                        ecma_char_t *property_name_p) /**< property name */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.2
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  // 1.
+  ecma_property_t *prop_p = ecma_op_object_get_own_property( obj_p, property_name_p);
+
+  // 2.
+  if ( prop_p != NULL )
+    {
+      // a.
+      if ( prop_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
+        {
+          ecma_object_t *setter_p = ecma_get_pointer( prop_p->u.named_accessor_property.set_p);
+
+          // i.
+          if ( setter_p == NULL )
+            {
+              return false;
+            }
+
+          // ii.
+          return true;
+        }
+      else
+        {
+          // b.
+
+          JERRY_ASSERT( prop_p->type == ECMA_PROPERTY_NAMEDDATA );
+
+          return ( prop_p->u.named_data_property.writable == ECMA_PROPERTY_WRITABLE );
+        }
+    }
+
+  // 3.
+  ecma_object_t *proto_p = ecma_get_pointer( obj_p->u.object.prototype_object_p);
+
+  // 4.
+  if ( proto_p == NULL )
+    {
+      return obj_p->u.object.extensible;
+    }
+
+  // 5.
+  ecma_property_t *inherited_p = ecma_op_object_get_property( proto_p, property_name_p);
+
+  // 6.
+  if ( inherited_p == NULL )
+    {
+      return obj_p->u.object.extensible;
+    }
+
+  // 7.
+  if ( inherited_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
+    {
+      ecma_object_t *setter_p = ecma_get_pointer( inherited_p->u.named_accessor_property.set_p);
+
+      // a.
+      if ( setter_p == NULL )
+        {
+          return false;
+        }
+
+      // b.
+      return true;
+    }
+  else
+    {
+      // 8.
+      JERRY_ASSERT( inherited_p->type == ECMA_PROPERTY_NAMEDDATA );
+
+      // a.
+      if ( !obj_p->u.object.extensible )
+        {
+          return false;
+        }
+      else
+        {
+          // b.
+          return ( inherited_p->u.named_data_property.writable == ECMA_PROPERTY_WRITABLE );
+        }
+    }
+
+  JERRY_UNREACHABLE();
 } /* ecma_op_object_can_put */
 
 /**
@@ -116,9 +389,20 @@ ecma_op_object_can_put( ecma_object_t *obj_p, /**< the object */
  */
 bool
 ecma_op_object_has_property( ecma_object_t *obj_p, /**< the object */
-                             ecma_array_first_chunk_t *property_name_p) /**< property name */
+                             ecma_char_t *property_name_p) /**< property name */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.2
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  ecma_property_t *desc_p = ecma_op_object_get_property( obj_p, property_name_p);
+
+  return ( desc_p != NULL );
 } /* ecma_op_object_has_property */
 
 /**
@@ -132,10 +416,60 @@ ecma_op_object_has_property( ecma_object_t *obj_p, /**< the object */
  */
 ecma_completion_value_t
 ecma_op_object_delete( ecma_object_t *obj_p, /**< the object */
-                       ecma_array_first_chunk_t *property_name_p, /**< property name */
+                       ecma_char_t *property_name_p, /**< property name */
                        bool is_throw) /**< flag that controls failure handling */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p, is_throw);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  /*
+   * ECMA-262 v5, 8.12.2
+   *
+   * Common implementation of operation for objects other than Host, Function or Arguments objects.
+   */
+
+  // 1.
+  ecma_property_t *desc_p = ecma_op_object_get_own_property( obj_p, property_name_p);
+
+  // 2.
+  if ( desc_p == NULL )
+    {
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
+    }
+
+  // 3.
+  bool is_configurable;
+  if ( desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
+    {
+      is_configurable = desc_p->u.named_accessor_property.configurable;
+    }
+  else
+    {
+      JERRY_ASSERT( desc_p->type == ECMA_PROPERTY_NAMEDDATA );
+
+      is_configurable = desc_p->u.named_data_property.configurable;
+    }
+
+  if ( is_configurable )
+    {
+      // a.
+      ecma_delete_property( obj_p, desc_p);
+
+      // b.
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
+    }
+  else if ( is_throw )
+    {
+      // 4.
+      return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
+    }
+  else
+    {
+      // 5.
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
+    }
+
+  JERRY_UNREACHABLE();
 } /* ecma_op_object_delete */
 
 /**
@@ -151,6 +485,8 @@ ecma_completion_value_t
 ecma_op_object_default_value( ecma_object_t *obj_p, /**< the object */
                               ecma_preferred_type_hint_t hint) /**< hint on preferred result type */
 {
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+
   JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, hint);
 } /* ecma_op_object_default_value */
 
@@ -165,11 +501,156 @@ ecma_op_object_default_value( ecma_object_t *obj_p, /**< the object */
  */
 ecma_completion_value_t
 ecma_op_object_define_own_property( ecma_object_t *obj_p, /**< the object */
-                                    ecma_array_first_chunk_t *property_name_p, /**< property name */
-                                    ecma_property_t property_desc, /**< property descriptor */
+                                    ecma_char_t *property_name_p, /**< property name */
+                                    ecma_property_descriptor_t property_desc, /**< property descriptor */
                                     bool is_throw) /**< flag that controls failure handling */
 {
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, property_name_p, property_desc, is_throw);
+  JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
+  JERRY_ASSERT( property_name_p != NULL );
+
+  const bool is_property_desc_generic_descriptor = ( !property_desc.is_value_defined
+                                                     && !property_desc.is_writable_defined
+                                                     && !property_desc.is_get_defined
+                                                     && !property_desc.is_set_defined );
+  const bool is_property_desc_data_descriptor = ( property_desc.is_value_defined
+                                                  || property_desc.is_writable_defined );
+  const bool is_property_desc_accessor_descriptor = ( property_desc.is_get_defined
+                                                      || property_desc.is_set_defined );
+
+  // 1.
+  ecma_property_t *current_p = ecma_op_object_get_own_property( obj_p, property_name_p);
+
+  // 2.
+  bool extensible = obj_p->u.object.extensible;
+
+  if ( current_p == NULL )
+    {
+      // 3.
+      if ( !extensible )
+        {
+          // Reject
+          if ( is_throw )
+            {
+              return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
+            }
+          else
+            {
+              return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
+            }
+        }
+      else
+        {
+          // 4.
+
+          // a.
+          if ( is_property_desc_generic_descriptor
+               || is_property_desc_data_descriptor )
+            {
+              ecma_create_named_data_property( obj_p,
+                                               property_name_p,
+                                               property_desc.writable,
+                                               property_desc.enumerable,
+                                               property_desc.configurable);
+            }
+          else
+            {
+              // b.
+              JERRY_ASSERT( is_property_desc_accessor_descriptor );
+
+              ecma_create_named_accessor_property( obj_p,
+                                                   property_name_p,
+                                                   property_desc.get_p,
+                                                   property_desc.set_p,
+                                                   property_desc.enumerable,
+                                                   property_desc.configurable);
+
+            }
+
+          return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
+        }
+    }
+
+  // 5.
+  if ( is_property_desc_generic_descriptor
+       && !property_desc.is_enumerable_defined
+       && !property_desc.is_configurable_defined )
+    {
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
+    }
+
+  // 6.
+  const bool is_current_data_descriptor = ( current_p->type == ECMA_PROPERTY_NAMEDDATA );
+  const bool is_current_accessor_descriptor = ( current_p->type == ECMA_PROPERTY_NAMEDACCESSOR );
+
+  JERRY_ASSERT( is_current_data_descriptor || is_current_accessor_descriptor );
+
+  bool is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = true;
+  if ( property_desc.is_value_defined )
+    {
+      if ( !is_current_data_descriptor
+           || !ecma_op_same_value( property_desc.value,
+                                   current_p->u.named_data_property.value) )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( property_desc.is_writable_defined )
+    {
+      if ( !is_current_data_descriptor
+           || property_desc.writable != current_p->u.named_data_property.writable )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( property_desc.is_get_defined )
+    {
+      if ( !is_current_accessor_descriptor
+           || property_desc.get_p != ecma_get_pointer( current_p->u.named_accessor_property.get_p) )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( property_desc.is_set_defined )
+    {
+      if ( !is_current_accessor_descriptor
+           || property_desc.set_p != ecma_get_pointer( current_p->u.named_accessor_property.set_p) )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( property_desc.is_enumerable_defined )
+    {
+      if ( ( is_current_data_descriptor
+             && property_desc.enumerable != current_p->u.named_data_property.enumerable )
+           || ( is_current_accessor_descriptor
+                && property_desc.configurable != current_p->u.named_accessor_property.enumerable ) )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( property_desc.is_configurable_defined )
+    {
+      if ( ( is_current_data_descriptor
+            && property_desc.configurable != current_p->u.named_data_property.configurable )
+          || ( is_current_accessor_descriptor
+              && property_desc.configurable != current_p->u.named_accessor_property.configurable ) )
+        {
+          is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
+        }
+    }
+
+  if ( is_every_field_in_desc_also_occurs_in_current_desc_with_same_value )
+    {
+      return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
+    }
+
+  // 7., ...
+  JERRY_UNIMPLEMENTED();
 } /* ecma_op_object_define_own_property */
 
 /**
diff --git a/src/libecmaoperations/ecma-objects-properties.h b/src/libecmaoperations/ecma-objects-properties.h
index ad31a42c9..2a30d4a49 100644
--- a/src/libecmaoperations/ecma-objects-properties.h
+++ b/src/libecmaoperations/ecma-objects-properties.h
@@ -26,22 +26,22 @@
  * @{
  */
 
-extern ecma_completion_value_t ecma_op_object_get( ecma_object_t *obj_p, ecma_array_first_chunk_t *property_name_p);
-extern ecma_property_t *ecma_op_object_get_own_property( ecma_object_t *obj_p, ecma_array_first_chunk_t *property_name_p);
-extern ecma_property_t *ecma_op_object_get_property( ecma_object_t *obj_p, ecma_array_first_chunk_t *property_name_p);
+extern ecma_completion_value_t ecma_op_object_get( ecma_object_t *obj_p, ecma_char_t *property_name_p);
+extern ecma_property_t *ecma_op_object_get_own_property( ecma_object_t *obj_p, ecma_char_t *property_name_p);
+extern ecma_property_t *ecma_op_object_get_property( ecma_object_t *obj_p, ecma_char_t *property_name_p);
 extern ecma_completion_value_t ecma_op_object_put( ecma_object_t *obj_p,
-                                                   ecma_array_first_chunk_t *property_name_p,
+                                                   ecma_char_t *property_name_p,
                                                    ecma_value_t value,
                                                    bool is_throw);
-extern bool ecma_op_object_can_put( ecma_object_t *obj_p, ecma_array_first_chunk_t *property_name_p);
-extern bool ecma_op_object_has_property( ecma_object_t *obj_p, ecma_array_first_chunk_t *property_name_p);
+extern bool ecma_op_object_can_put( ecma_object_t *obj_p, ecma_char_t *property_name_p);
+extern bool ecma_op_object_has_property( ecma_object_t *obj_p, ecma_char_t *property_name_p);
 extern ecma_completion_value_t ecma_op_object_delete( ecma_object_t *obj_p,
-                                                      ecma_array_first_chunk_t *property_name_p,
+                                                      ecma_char_t *property_name_p,
                                                       bool is_throw);
 extern ecma_completion_value_t ecma_op_object_default_value( ecma_object_t *obj_p, ecma_preferred_type_hint_t hint);
 extern ecma_completion_value_t ecma_op_object_define_own_property( ecma_object_t *obj_p,
-                                                                   ecma_array_first_chunk_t *property_name_p,
-                                                                   ecma_property_t property_desc,
+                                                                   ecma_char_t *property_name_p,
+                                                                   ecma_property_descriptor_t property_desc,
                                                                    bool is_throw);
 
 /**