diff --git a/CMakeLists.txt b/CMakeLists.txt
index 444e1dcd3..d911a45d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -238,6 +238,7 @@ project (Jerry CXX C ASM)
  function(declare_targets_for_build_mode BUILD_MODE)
   string(TOLOWER "${PLATFORM_EXT}" PLATFORM_L)
   set(TARGET_NAME ${BUILD_MODE_PREFIX_${BUILD_MODE}}.${PLATFORM_L})
+  set(PLUGINS_TARGET_NAME ${BUILD_MODE_PREFIX_${BUILD_MODE}}.plugins.${PLATFORM_L})
   set(LIBC_TARGET_NAME ${BUILD_MODE_PREFIX_${BUILD_MODE}}.jerry-libc.${PLATFORM_L})
 
   function(declare_target_with_modifiers ) # modifiers are passed in ARGN implicit argument
@@ -245,11 +246,13 @@ project (Jerry CXX C ASM)
    foreach(MODIFIER ${ARGN})
     set(TARGET_NAME ${TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
 
-    set(LIBC_TARGET_NAME ${LIBC_TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
     set(CORE_TARGET_NAME ${CORE_TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
+    set(LIBC_TARGET_NAME ${LIBC_TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
+    set(PLUGINS_TARGET_NAME ${PLUGINS_TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
    endforeach()
    set(CORE_TARGET_NAME ${CORE_TARGET_NAME}.jerry-core)
    set(LIBC_TARGET_NAME ${LIBC_TARGET_NAME}.lib)
+   set(PLUGINS_TARGET_NAME ${PLUGINS_TARGET_NAME}.lib)
 
    set(DEFINES_JERRY )
 
@@ -269,7 +272,7 @@ project (Jerry CXX C ASM)
                 PROPERTY LINK_FLAGS "${COMPILE_FLAGS_JERRY} ${CXX_FLAGS_JERRY} ${FLAGS_COMMON_${BUILD_MODE}} ${LINKER_FLAGS_COMMON} ${LINKER_FLAGS_STATIC}")
    target_compile_definitions(${TARGET_NAME} PRIVATE ${DEFINES_JERRY})
    target_include_directories(${TARGET_NAME} PRIVATE ${INCLUDE_CORE_INTERFACE})
-   target_link_libraries(${TARGET_NAME} ${CORE_TARGET_NAME} ${LIBC_TARGET_NAME} ${PREFIX_IMPORTED_LIB}libgcc)
+   target_link_libraries(${TARGET_NAME} ${PLUGINS_TARGET_NAME} ${CORE_TARGET_NAME} ${LIBC_TARGET_NAME} ${PREFIX_IMPORTED_LIB}libgcc)
 
    add_cppcheck_target(${TARGET_NAME})
 
diff --git a/jerry-core/config.h b/jerry-core/config.h
index 9810b4a1c..6d39bd58f 100644
--- a/jerry-core/config.h
+++ b/jerry-core/config.h
@@ -155,4 +155,19 @@
  */
 #define CONFIG_EXTENSION_CHAR_BUFFER_SIZE 2048
 
+/**
+ * Maximum number of registered extensions
+ */
+#define CONFIG_EXTENSION_MAX_NUMBER_OF_EXTENSIONS 32
+
+/**
+ * Maximum number of functions in an extension
+ */
+#define CONFIG_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION 1024
+
+/**
+ * Maximum number of arguments in a function
+ */
+#define CONFIG_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION 16
+
 #endif /* !CONFIG_H */
diff --git a/jerry-core/ecma/base/ecma-gc.cpp b/jerry-core/ecma/base/ecma-gc.cpp
index e0669f060..f475f64fd 100644
--- a/jerry-core/ecma/base/ecma-gc.cpp
+++ b/jerry-core/ecma/base/ecma-gc.cpp
@@ -320,6 +320,7 @@ ecma_gc_mark (ecma_object_t *object_p) /**< object to mark from */
             case ECMA_INTERNAL_PROPERTY_CODE: /* an integer */
             case ECMA_INTERNAL_PROPERTY_BUILT_IN_ID: /* an integer */
             case ECMA_INTERNAL_PROPERTY_BUILT_IN_ROUTINE_ID: /* an integer */
+            case ECMA_INTERNAL_PROPERTY_EXTENSION_ID: /* an integer */
             case ECMA_INTERNAL_PROPERTY_NON_INSTANTIATED_BUILT_IN_MASK_0_31: /* an integer (bit-mask) */
             case ECMA_INTERNAL_PROPERTY_NON_INSTANTIATED_BUILT_IN_MASK_32_63: /* an integer (bit-mask) */
             {
diff --git a/jerry-core/ecma/base/ecma-globals.h b/jerry-core/ecma/base/ecma-globals.h
index 5f53760f9..b38adf5b5 100644
--- a/jerry-core/ecma/base/ecma-globals.h
+++ b/jerry-core/ecma/base/ecma-globals.h
@@ -223,6 +223,9 @@ typedef enum
       ([[Built-in routine ID]]) */
   ECMA_INTERNAL_PROPERTY_BUILT_IN_ROUTINE_ID,
 
+  /** Identifier of implementation-defined extension object */
+  ECMA_INTERNAL_PROPERTY_EXTENSION_ID,
+
   /**
    * Bit-mask of non-instantiated built-in's properties (bits 0-31)
    */
@@ -374,6 +377,8 @@ typedef enum
                                           of ECMA-262 v5 specification */
   ECMA_OBJECT_TYPE_ARGUMENTS, /**< Arguments object (10.6) */
   ECMA_OBJECT_TYPE_ARRAY, /**< Array object (15.4) */
+  ECMA_OBJECT_TYPE_EXTENSION, /**< Extension (implementation-defined) object
+                               *   See also: ecma_extension_instantiate */
   // ECMA_OBJECT_TYPE_HOST, /**< Host object */
   ECMA_OBJECT_TYPE__COUNT /**< number of object types */
 } ecma_object_type_t;
@@ -733,7 +738,7 @@ FIXME (Move to library that should define the type (literal.h /* ? */))
 typedef uint32_t literal_index_t;
 
 /**
- * Identifiers of ECMA magic string constants
+ * Identifiers of ECMA and implementation-defined magic string constants
  */
 typedef enum
 {
diff --git a/jerry-core/ecma/base/ecma-helpers-string.cpp b/jerry-core/ecma/base/ecma-helpers-string.cpp
index ba5bbe4f5..3f27da91b 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.cpp
+++ b/jerry-core/ecma/base/ecma-helpers-string.cpp
@@ -876,17 +876,18 @@ ecma_string_to_number (const ecma_string_t *str_p) /**< ecma-string */
  */
 ssize_t
 ecma_string_to_zt_string (const ecma_string_t *string_desc_p, /**< ecma-string descriptor */
-                          ecma_char_t *buffer_p, /**< destination buffer */
+                          ecma_char_t *buffer_p, /**< destination buffer pointer (can be NULL if buffer_size == 0) */
                           ssize_t buffer_size) /**< size of buffer */
 {
   JERRY_ASSERT (string_desc_p != NULL);
   JERRY_ASSERT (string_desc_p->refs > 0);
-  JERRY_ASSERT (buffer_p != NULL);
-  JERRY_ASSERT (buffer_size > 0);
+  JERRY_ASSERT (buffer_p != NULL || buffer_size == 0);
+  JERRY_ASSERT (buffer_size >= 0);
 
   ssize_t required_buffer_size = ((ecma_string_get_length (string_desc_p) + 1) * ((ssize_t) sizeof (ecma_char_t)));
 
-  if (required_buffer_size > buffer_size)
+  if (required_buffer_size > buffer_size
+      || buffer_size == 0)
   {
     return -required_buffer_size;
   }
diff --git a/jerry-core/ecma/base/ecma-helpers.cpp b/jerry-core/ecma/base/ecma-helpers.cpp
index eebc87099..0fc9e46d3 100644
--- a/jerry-core/ecma/base/ecma-helpers.cpp
+++ b/jerry-core/ecma/base/ecma-helpers.cpp
@@ -787,6 +787,7 @@ ecma_free_internal_property (ecma_property_t *property_p) /**< the property */
     case ECMA_INTERNAL_PROPERTY_CODE: /* an integer */
     case ECMA_INTERNAL_PROPERTY_BUILT_IN_ID: /* an integer */
     case ECMA_INTERNAL_PROPERTY_BUILT_IN_ROUTINE_ID: /* an integer */
+    case ECMA_INTERNAL_PROPERTY_EXTENSION_ID: /* an integer */
     case ECMA_INTERNAL_PROPERTY_NON_INSTANTIATED_BUILT_IN_MASK_0_31: /* an integer (bit-mask) */
     case ECMA_INTERNAL_PROPERTY_NON_INSTANTIATED_BUILT_IN_MASK_32_63: /* an integer (bit-mask) */
     {
diff --git a/jerry-core/ecma/operations/ecma-init-finalize.cpp b/jerry-core/ecma/base/ecma-init-finalize.cpp
similarity index 97%
rename from jerry-core/ecma/operations/ecma-init-finalize.cpp
rename to jerry-core/ecma/base/ecma-init-finalize.cpp
index e577f19e4..7e15991f5 100644
--- a/jerry-core/ecma/operations/ecma-init-finalize.cpp
+++ b/jerry-core/ecma/base/ecma-init-finalize.cpp
@@ -14,10 +14,10 @@
  */
 
 #include "ecma-builtins.h"
-#include "ecma-helpers.h"
 #include "ecma-gc.h"
+#include "ecma-helpers.h"
+#include "ecma-init-finalize.h"
 #include "ecma-lcache.h"
-#include "ecma-operations.h"
 #include "ecma-stack.h"
 #include "mem-allocator.h"
 
diff --git a/jerry-core/ecma/operations/ecma-operations.h b/jerry-core/ecma/base/ecma-init-finalize.h
similarity index 85%
rename from jerry-core/ecma/operations/ecma-operations.h
rename to jerry-core/ecma/base/ecma-init-finalize.h
index 492f967fe..a002cf6e0 100644
--- a/jerry-core/ecma/operations/ecma-operations.h
+++ b/jerry-core/ecma/base/ecma-init-finalize.h
@@ -13,17 +13,15 @@
  * limitations under the License.
  */
 
-#ifndef JERRY_ECMA_OPERATIONS_H
-#define JERRY_ECMA_OPERATIONS_H
-
-#include "jrt.h"
+#ifndef ECMA_INIT_FINALIZE_H
+#define ECMA_INIT_FINALIZE_H
 
 /** \addtogroup ecma ECMA
  * @{
  */
 
 /**
- * \addtogroup ecmainitfinalize Initialization and finalization of ECMA components
+ * \addtogroup ecmainitfinalize Initialization and finalization of ECMA
  * @{
  */
 
@@ -35,4 +33,4 @@ extern void ecma_finalize (void);
  * @}
  */
 
-#endif /* JERRY_ECMA_OPERATIONS_H */
+#endif /* ECMA_INIT_FINALIZE_H */
diff --git a/jerry-core/ecma/base/ecma-magic-strings.inc.h b/jerry-core/ecma/base/ecma-magic-strings.inc.h
index 6706b8639..7302fbf6e 100644
--- a/jerry-core/ecma/base/ecma-magic-strings.inc.h
+++ b/jerry-core/ecma/base/ecma-magic-strings.inc.h
@@ -1,4 +1,4 @@
-/* Copyright 2014 Samsung Electronics Co., Ltd.
+/* Copyright 2014-2015 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.
@@ -16,7 +16,6 @@
 /*
  * List of ECMA magic strings
  */
-
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_ARGUMENTS, "arguments")
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_EVAL, "eval")
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_PROTOTYPE, "prototype")
@@ -208,3 +207,8 @@ ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_RIGHT_SQUARE_CHAR, "]")
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_COLON_CHAR, ":")
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_SPACE_CHAR, " ")
 ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING__EMPTY, "")
+
+/*
+ * Implementation-defined magic strings
+ */
+ECMA_MAGIC_STRING_DEF (ECMA_MAGIC_STRING_JERRY_UL, "Jerry")
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h b/jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h
index c70ca9d13..4c52a18ea 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-global.inc.h
@@ -124,6 +124,13 @@ OBJECT_VALUE (ECMA_MAGIC_STRING_NUMBER_UL,
               ECMA_PROPERTY_CONFIGURABLE)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_NUMBER_BUILTIN */
 
+// Implementation-defined property for accessing the engine's extensions */
+OBJECT_VALUE (ECMA_MAGIC_STRING_JERRY_UL,
+              ecma_builtin_get (ECMA_BUILTIN_ID_JERRY),
+              ECMA_PROPERTY_NOT_WRITABLE,
+              ECMA_PROPERTY_NOT_ENUMERABLE,
+              ECMA_PROPERTY_NOT_CONFIGURABLE)
+
 // ECMA-262 v5, 15.1.4.7
 CP_UNIMPLEMENTED_VALUE (ECMA_MAGIC_STRING_DATE_UL,
                         ecma_builtin_get (ECMA_BUILTIN_ID_DATE),
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-internal-routines-template.inc.h b/jerry-core/ecma/builtin-objects/ecma-builtin-internal-routines-template.inc.h
index 286d702cf..2ca40939a 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-internal-routines-template.inc.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-internal-routines-template.inc.h
@@ -167,6 +167,8 @@ TRY_TO_INSTANTIATE_PROPERTY_ROUTINE_NAME (BUILTIN_UNDERSCORED_ID) (ecma_object_t
 
   switch (id)
   {
+    JERRY_ASSERT ((uint16_t) id == id);
+
 #define ROUTINE(name, c_function_name, args_number, length_prop_value) case name: \
     { \
       ecma_object_t *func_obj_p = ecma_builtin_make_function_object_for_routine (builtin_object_id, \
@@ -273,9 +275,8 @@ TRY_TO_INSTANTIATE_PROPERTY_ROUTINE_NAME (BUILTIN_UNDERSCORED_ID) (ecma_object_t
  *         Returned value must be freed with ecma_free_completion_value.
  */
 ecma_completion_value_t
-DISPATCH_ROUTINE_ROUTINE_NAME (BUILTIN_UNDERSCORED_ID) (ecma_magic_string_id_t builtin_routine_id, /**< built-in's
-                                                                                                        routine's
-                                                                                                        name */
+DISPATCH_ROUTINE_ROUTINE_NAME (BUILTIN_UNDERSCORED_ID) (uint16_t builtin_routine_id, /**< built-in wide routine
+                                                                                          identifier */
                                                         const ecma_value_t& this_arg_value, /**< 'this' argument
                                                                                                  value */
                                                         const ecma_value_t arguments_list [], /**< list of arguments
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-jerry.cpp b/jerry-core/ecma/builtin-objects/ecma-builtin-jerry.cpp
new file mode 100644
index 000000000..c591dbdd9
--- /dev/null
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-jerry.cpp
@@ -0,0 +1,499 @@
+/* Copyright 2015 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.
+ */
+
+#include <string.h>
+
+#include "ecma-alloc.h"
+#include "ecma-builtins.h"
+#include "ecma-exceptions.h"
+#include "ecma-extension.h"
+#include "ecma-gc.h"
+#include "ecma-helpers.h"
+#include "ecma-objects-general.h"
+
+#define ECMA_BUILTINS_INTERNAL
+#include "ecma-builtins-internal.h"
+
+/**
+ * List of registered extensions
+ */
+static jerry_extension_descriptor_t *jerry_extensions_list_p = NULL;
+
+/**
+ * Index to assign to next registered extension
+ */
+static uint32_t jerry_extensions_next_index = 0;
+
+/**
+ * If the property's name is one of built-in properties of the built-in object
+ * that is not instantiated yet, instantiate the property and
+ * return pointer to the instantiated property.
+ *
+ * @return pointer property, if one was instantiated,
+ *         NULL - otherwise.
+ */
+ecma_property_t*
+ecma_builtin_jerry_try_to_instantiate_property (ecma_object_t *obj_p, /**< object */
+                                                ecma_string_t *extension_name_p) /**< property's name */
+{
+  JERRY_ASSERT (ecma_builtin_is (obj_p, ECMA_BUILTIN_ID_JERRY));
+  JERRY_ASSERT (ecma_find_named_property (obj_p, extension_name_p) == NULL);
+
+  ssize_t req_buffer_size = ecma_string_to_zt_string (extension_name_p, NULL, 0);
+  JERRY_ASSERT (req_buffer_size < 0);
+
+  ecma_property_t *prop_p = NULL;
+
+  MEM_DEFINE_LOCAL_ARRAY (extension_name_zt_buf_p, -req_buffer_size, uint8_t);
+
+  req_buffer_size = ecma_string_to_zt_string (extension_name_p, extension_name_zt_buf_p, -req_buffer_size);
+  JERRY_ASSERT (req_buffer_size > 0);
+
+#if CONFIG_ECMA_CHAR_ENCODING != CONFIG_ECMA_CHAR_ASCII
+  JERRY_UNIMPLEMENTED ("Only ASCII encoding support is implemented.");
+#else /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+  const char *name_p = (const char*) extension_name_zt_buf_p;
+
+  jerry_extension_descriptor_t *desc_p;
+  for (desc_p = jerry_extensions_list_p;
+       desc_p != NULL;
+       desc_p = desc_p->next_p)
+  {
+    if (!strcmp (name_p, desc_p->name_p))
+    {
+      break;
+    }
+  }
+
+  if (desc_p == NULL)
+  {
+    /* no extension with specified name was found */
+    prop_p = NULL;
+  }
+  else
+  {
+    prop_p = ecma_create_named_data_property (obj_p,
+                                              extension_name_p,
+                                              ECMA_PROPERTY_NOT_WRITABLE,
+                                              ECMA_PROPERTY_NOT_ENUMERABLE,
+                                              ECMA_PROPERTY_NOT_CONFIGURABLE);
+
+    ecma_object_t *extension_object_p = ecma_create_object (NULL,
+                                                            false,
+                                                            ECMA_OBJECT_TYPE_EXTENSION);
+    ecma_set_object_is_builtin (extension_object_p, true);
+    ecma_property_t *extension_id_prop_p = ecma_create_internal_property (extension_object_p,
+                                                                          ECMA_INTERNAL_PROPERTY_EXTENSION_ID);
+    extension_id_prop_p->u.internal_property.value = desc_p->index;
+
+    ecma_named_data_property_assign_value (obj_p, prop_p, ecma_make_object_value (extension_object_p));
+
+    ecma_deref_object (extension_object_p);
+  }
+#endif /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+
+  MEM_FINALIZE_LOCAL_ARRAY (extension_name_zt_buf_p);
+
+  return prop_p;
+} /* ecma_builtin_jerry_try_to_instantiate_property */
+
+/**
+ * Stub for dispatcher of the built-in's routines
+ *
+ * Warning:
+ *         does not return (the stub should be unreachable)
+ */
+ecma_completion_value_t
+ecma_builtin_jerry_dispatch_routine (uint16_t builtin_routine_id, /**< built-in wide identifier of routine */
+                                     const ecma_value_t& this_arg_value __attr_unused___, /**< 'this' argument value */
+                                     const ecma_value_t arguments_list [], /**< list of arguments
+                                                                                                 passed to routine */
+                                     ecma_length_t arguments_number) /**< length of arguments' list */
+{
+  uint32_t extension_object_index = builtin_routine_id / ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION;
+  uint32_t function_index = builtin_routine_id % ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION;
+
+  jerry_extension_descriptor_t *desc_p;
+  for (desc_p = jerry_extensions_list_p;
+       desc_p != NULL;
+       desc_p = desc_p->next_p)
+  {
+    if (desc_p->index == extension_object_index)
+    {
+      break;
+    }
+  }
+  JERRY_ASSERT (desc_p != NULL);
+
+  JERRY_ASSERT (function_index < desc_p->functions_count);
+  const jerry_extension_function_t *function_p = &desc_p->functions_p [function_index];
+
+  bool throw_type_error = false;
+  if (function_p->args_number != arguments_number)
+  {
+    throw_type_error = true;
+  }
+  else
+  {
+    uint32_t arg_index;
+    for (arg_index = 0; arg_index < function_p->args_number; arg_index++)
+    {
+      jerry_extension_function_arg_t *arg_p = &function_p->args_p [arg_index];
+      const ecma_value_t arg_value = arguments_list [arg_index];
+
+      if (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_BOOLEAN)
+      {
+        if (!ecma_is_value_boolean (arg_value))
+        {
+          break;
+        }
+        else
+        {
+          arg_p->v_bool = ecma_is_value_true (arg_value);
+        }
+      }
+      else if (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_FLOAT32
+               || arg_p->type == JERRY_EXTENSION_FIELD_TYPE_FLOAT64
+               || arg_p->type == JERRY_EXTENSION_FIELD_TYPE_UINT32)
+      {
+        if (!ecma_is_value_number (arg_value))
+        {
+          break;
+        }
+        else
+        {
+          ecma_number_t num_value = *ecma_get_number_from_value (arg_value);
+          if (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_FLOAT32)
+          {
+            arg_p->v_float32 = (float) num_value;
+          }
+          else if (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_FLOAT64)
+          {
+#if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32
+            JERRY_UNREACHABLE ();
+#elif CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64
+            arg_p->v_float64 = num_value;
+#endif /* CONFIG_ECMA_NUMBER_TYPE ==  CONFIG_ECMA_NUMBER_FLOAT64 */
+          }
+          else if (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_UINT32)
+          {
+            arg_p->v_uint32 = ecma_number_to_uint32 (num_value);
+          }
+        }
+      }
+      else
+      {
+        JERRY_ASSERT (arg_p->type == JERRY_EXTENSION_FIELD_TYPE_STRING);
+
+#if CONFIG_ECMA_CHAR_ENCODING != CONFIG_ECMA_CHAR_ASCII
+        JERRY_UNIMPLEMENTED ("Only ASCII encoding support is implemented.");
+#else /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+        JERRY_UNIMPLEMENTED ("String arguments are not implemented");
+#endif /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+      }
+    }
+
+    if (arg_index != function_p->args_number)
+    {
+      throw_type_error = true;
+    }
+    else
+    {
+      function_p->function_wrapper_p (function_p);
+    }
+  }
+
+  if (throw_type_error)
+  {
+    return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE));
+  }
+  else
+  {
+    return ecma_make_empty_completion_value ();
+  }
+} /* ecma_builtin_jerry_dispatch_routine */
+
+bool
+ecma_extension_register (jerry_extension_descriptor_t *extension_desc_p) /**< extension description */
+{
+  if (jerry_extensions_next_index >= ECMA_EXTENSION_MAX_NUMBER_OF_EXTENSIONS)
+  {
+    return false;
+  }
+
+  if (extension_desc_p->functions_count > ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION)
+  {
+    return false;
+  }
+
+  /* Check names intersection */
+  for (uint32_t i = 0; i < extension_desc_p->fields_count; i++)
+  {
+    for (uint32_t j = 0; j < extension_desc_p->fields_count; j++)
+    {
+      if (i != j
+          && !strcmp (extension_desc_p->fields_p [i].field_name_p,
+                      extension_desc_p->fields_p [j].field_name_p))
+      {
+        return false;
+      }
+    }
+  }
+
+  for (uint32_t i = 0; i < extension_desc_p->functions_count; i++)
+  {
+    if (extension_desc_p->functions_p [i].args_number >= ECMA_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION)
+    {
+      return false;
+    }
+
+#if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32
+    /* Check if we can represent the arguments' values */
+    for (uint32_t j = 0; j < extension_desc_p->functions_p [i].args_number; j++)
+    {
+      if (extension_desc_p->functions_p[i].args_p[j].type == JERRY_EXTENSION_FIELD_TYPE_FLOAT64)
+      {
+        return false;
+      }
+    }
+#endif /* CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32 */
+
+    for (uint32_t j = 0; j < extension_desc_p->functions_count; j++)
+    {
+      if (i != j
+          && !strcmp (extension_desc_p->functions_p [i].function_name_p,
+                      extension_desc_p->functions_p [j].function_name_p))
+      {
+        return false;
+      }
+    }
+  }
+
+  for (uint32_t i = 0; i < extension_desc_p->fields_count; i++)
+  {
+#if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32
+    /* Check if we can represent the field's value */
+
+    if (extension_desc_p->fields_p[i].type == JERRY_EXTENSION_FIELD_TYPE_FLOAT64)
+    {
+      return false;
+    }
+
+    if (extension_desc_p->fields_p[i].type == JERRY_EXTENSION_FIELD_TYPE_UINT32
+        && ecma_number_to_uint32 (ecma_uint32_to_number (extension_desc_p->fields_p[i].v_uint32))
+           != extension_desc_p->fields_p[i].v_uint32)
+    {
+      return false;
+    }
+#endif /* CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32 */
+
+    for (uint32_t j = 0; j < extension_desc_p->functions_count; j++)
+    {
+      if (!strcmp (extension_desc_p->fields_p [i].field_name_p,
+                   extension_desc_p->functions_p [j].function_name_p))
+      {
+        return false;
+      }
+    }
+  }
+
+  for (jerry_extension_descriptor_t *desc_iter_p = jerry_extensions_list_p;
+       desc_iter_p != NULL;
+       desc_iter_p = desc_iter_p->next_p)
+  {
+    if (desc_iter_p == extension_desc_p
+        || !strcmp (desc_iter_p->name_p, extension_desc_p->name_p))
+    {
+      /* The extension already registered or an extension with the same name already registered */
+      return false;
+    }
+  }
+
+  extension_desc_p->next_p = jerry_extensions_list_p;
+  jerry_extensions_list_p = extension_desc_p;
+  extension_desc_p->index = jerry_extensions_next_index++;
+
+  return true;
+} /* ecma_extension_register */
+
+/**
+ * [[GetOwnProperty]] Implementation extension object's operation
+ *
+ * @return property descriptor
+ */
+ecma_property_t*
+ecma_op_extension_object_get_own_property (ecma_object_t *obj_p, /**< the extension object */
+                                           ecma_string_t *property_name_p) /**< property name */
+{
+  JERRY_ASSERT (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_EXTENSION);
+
+  // 1.
+  ecma_property_t *prop_p = ecma_op_general_object_get_own_property (obj_p, property_name_p);
+
+  // 2.
+  if (prop_p != NULL)
+  {
+    return prop_p;
+  }
+
+#if CONFIG_ECMA_CHAR_ENCODING != CONFIG_ECMA_CHAR_ASCII
+  JERRY_UNIMPLEMENTED ("Only ASCII encoding support is implemented.");
+#else /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+  ssize_t req_buffer_size = ecma_string_to_zt_string (property_name_p, NULL, 0);
+  JERRY_ASSERT (req_buffer_size < 0);
+
+  MEM_DEFINE_LOCAL_ARRAY (property_name_zt_buf_p, -req_buffer_size, uint8_t);
+
+  req_buffer_size = ecma_string_to_zt_string (property_name_p, property_name_zt_buf_p, -req_buffer_size);
+  JERRY_ASSERT (req_buffer_size > 0);
+
+  const char *name_p = (const char*) property_name_zt_buf_p;
+
+  ecma_property_t *extension_id_prop_p = ecma_get_internal_property (obj_p,
+                                                                     ECMA_INTERNAL_PROPERTY_EXTENSION_ID);
+  uint32_t extension_object_index = extension_id_prop_p->u.internal_property.value;
+
+  jerry_extension_descriptor_t *desc_p;
+  for (desc_p = jerry_extensions_list_p;
+       desc_p != NULL;
+       desc_p = desc_p->next_p)
+  {
+    if (desc_p->index == extension_object_index)
+    {
+      break;
+    }
+  }
+  JERRY_ASSERT (desc_p != NULL);
+
+  uint32_t field_index;
+  for (field_index = 0;
+       field_index < desc_p->fields_count;
+       field_index++)
+  {
+    if (!strcmp (name_p, desc_p->fields_p [field_index].field_name_p))
+    {
+      break;
+    }
+  }
+
+  if (field_index < desc_p->fields_count)
+  {
+    const jerry_extension_field_t *field_p = &desc_p->fields_p [field_index];
+
+    ecma_value_t value;
+    prop_p = ecma_create_named_data_property (obj_p,
+                                              property_name_p,
+                                              ECMA_PROPERTY_NOT_WRITABLE,
+                                              ECMA_PROPERTY_NOT_ENUMERABLE,
+                                              ECMA_PROPERTY_NOT_CONFIGURABLE);
+
+    switch (field_p->type)
+    {
+      case JERRY_EXTENSION_FIELD_TYPE_BOOLEAN:
+      {
+        value = ecma_make_simple_value (field_p->v_bool ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
+
+        break;
+      }
+      case JERRY_EXTENSION_FIELD_TYPE_FLOAT32:
+      {
+        ecma_number_t *num_p = ecma_alloc_number ();
+        *num_p = field_p->v_float32;
+        value = ecma_make_number_value (num_p);
+
+        break;
+      }
+      case JERRY_EXTENSION_FIELD_TYPE_FLOAT64:
+      {
+#if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT32
+        JERRY_UNREACHABLE ();
+#elif CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64
+        ecma_number_t *num_p = ecma_alloc_number ();
+        *num_p = field_p->v_float64;
+        value = ecma_make_number_value (num_p);
+#endif /* CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64 */
+
+        break;
+      }
+      case JERRY_EXTENSION_FIELD_TYPE_UINT32:
+      {
+        ecma_number_t *num_p = ecma_alloc_number ();
+        *num_p = ecma_uint32_to_number (field_p->v_uint32);
+        JERRY_ASSERT (ecma_number_to_uint32 (*num_p) == field_p->v_uint32);
+        value = ecma_make_number_value (num_p);
+
+        break;
+      }
+      case JERRY_EXTENSION_FIELD_TYPE_STRING:
+      {
+        const ecma_char_t *string_p = (const ecma_char_t*) field_p->v_string;
+        ecma_string_t *str_p = ecma_new_ecma_string (string_p);
+        value = ecma_make_string_value (str_p);
+
+        break;
+      }
+    }
+
+    ecma_named_data_property_assign_value (obj_p, prop_p, value);
+    ecma_free_value (value, true);
+  }
+  else
+  {
+    uint32_t function_index;
+    for (function_index = 0;
+         function_index < desc_p->functions_count;
+         function_index++)
+    {
+      if (!strcmp (name_p, desc_p->functions_p [function_index].function_name_p))
+      {
+        break;
+      }
+    }
+
+    if (function_index < desc_p->functions_count)
+    {
+      const jerry_extension_function_t *function_p = &desc_p->functions_p [function_index];
+
+      /* Currently, combined identifier of extension object and extension function should fit in uint16_t. */
+      JERRY_STATIC_ASSERT (ECMA_EXTENSION_MAX_NUMBER_OF_EXTENSIONS * ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION
+                           < (1ull << (sizeof (uint16_t) * JERRY_BITSINBYTE)));
+
+      uint32_t routine_id = desc_p->index * ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION + function_index;
+      JERRY_ASSERT ((uint16_t) routine_id == routine_id);
+      JERRY_STATIC_ASSERT ((ecma_number_t) ECMA_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION
+                           == ECMA_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION);
+      ecma_number_t args_number = ecma_uint32_to_number (function_p->args_number);
+      JERRY_ASSERT (function_p->args_number == ecma_number_to_uint32 (args_number));
+      ecma_object_t *func_obj_p = ecma_builtin_make_function_object_for_routine (ECMA_BUILTIN_ID_JERRY,
+                                                                                 (uint16_t) routine_id,
+                                                                                 args_number);
+
+      prop_p = ecma_create_named_data_property (obj_p,
+                                                property_name_p,
+                                                ECMA_PROPERTY_NOT_WRITABLE,
+                                                ECMA_PROPERTY_NOT_ENUMERABLE,
+                                                ECMA_PROPERTY_NOT_CONFIGURABLE);
+
+      ecma_named_data_property_assign_value (obj_p, prop_p, ecma_make_object_value (func_obj_p));
+
+      ecma_deref_object (func_obj_p);
+    }
+  }
+
+  MEM_FINALIZE_LOCAL_ARRAY (property_name_zt_buf_p);
+
+  return prop_p;
+#endif /* CONFIG_ECMA_CHAR_ENCODING == CONFIG_ECMA_CHAR_ASCII */
+} /* ecma_op_extension_object_get_own_property */
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtins-internal.h b/jerry-core/ecma/builtin-objects/ecma-builtins-internal.h
index bb5e18000..966aa27f9 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtins-internal.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtins-internal.h
@@ -48,7 +48,7 @@
 /* ecma-builtins.c */
 extern ecma_object_t*
 ecma_builtin_make_function_object_for_routine (ecma_builtin_id_t builtin_id,
-                                               ecma_magic_string_id_t routine_id,
+                                               uint16_t routine_id,
                                                ecma_number_t length_prop_num_value);
 extern int32_t
 ecma_builtin_bin_search_for_magic_string_id_in_array (const ecma_magic_string_id_t ids[],
@@ -60,6 +60,7 @@ ecma_builtin_bin_search_for_magic_string_id_in_array (const ecma_magic_string_id
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
 extern ecma_completion_value_t \
 ecma_builtin_ ## lowercase_name ## _dispatch_call (const ecma_value_t *arguments_list_p, \
@@ -68,7 +69,7 @@ extern ecma_completion_value_t \
 ecma_builtin_ ## lowercase_name ## _dispatch_construct (const ecma_value_t *arguments_list_p, \
                                                         ecma_length_t arguments_list_len); \
 extern ecma_completion_value_t \
-ecma_builtin_ ## lowercase_name ## _dispatch_routine (ecma_magic_string_id_t builtin_routine_id, \
+ecma_builtin_ ## lowercase_name ## _dispatch_routine (uint16_t builtin_routine_id, \
                                                       const ecma_value_t& this_arg_value, \
                                                       const ecma_value_t arguments_list [], \
                                                       ecma_length_t arguments_number); \
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtins.cpp b/jerry-core/ecma/builtin-objects/ecma-builtins.cpp
index 17800e30a..84f202a6a 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtins.cpp
+++ b/jerry-core/ecma/builtin-objects/ecma-builtins.cpp
@@ -33,7 +33,7 @@
 
 static ecma_completion_value_t
 ecma_builtin_dispatch_routine (ecma_builtin_id_t builtin_object_id,
-                               ecma_magic_string_id_t builtin_routine_id,
+                               uint16_t builtin_routine_id,
                                const ecma_value_t& this_arg_value,
                                const ecma_value_t arguments_list [],
                                ecma_length_t arguments_number);
@@ -186,11 +186,15 @@ ecma_instantiate_builtin (ecma_builtin_id_t id) /**< built-in id */
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
     case builtin_id: \
     { \
       JERRY_ASSERT (ecma_builtin_objects [builtin_id] == NULL); \
-      ecma_builtin_ ## lowercase_name ## _sort_property_names (); \
+      if (is_static) \
+      { \
+        ecma_builtin_ ## lowercase_name ## _sort_property_names (); \
+      } \
       \
       ecma_object_t *prototype_obj_p; \
       if (object_prototype_builtin_id == ECMA_BUILTIN_ID__COUNT) \
@@ -273,6 +277,7 @@ ecma_builtin_try_to_instantiate_property (ecma_object_t *object_p, /**< object *
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
     case builtin_id: \
     { \
@@ -310,8 +315,8 @@ ecma_object_t*
 ecma_builtin_make_function_object_for_routine (ecma_builtin_id_t builtin_id, /**< identifier of built-in object
                                                                                   that initially contains property
                                                                                   with the routine */
-                                               ecma_magic_string_id_t routine_id, /**< name of the built-in
-                                                                                       object's routine property */
+                                               uint16_t routine_id, /**< builtin-wide identifier of the built-in
+                                                                         object's routine property */
                                                ecma_number_t length_prop_num_value) /**< ecma-number - value
                                                                                          of 'length' property
                                                                                          of function object to create */
@@ -381,10 +386,10 @@ ecma_builtin_dispatch_call (ecma_object_t *obj_p, /**< built-in object */
     uint64_t routine_id_field = jrt_extract_bit_field (packed_built_in_and_routine_id,
                                                        ECMA_BUILTIN_ROUTINE_ID_BUILT_IN_ROUTINE_ID_POS,
                                                        ECMA_BUILTIN_ROUTINE_ID_BUILT_IN_ROUTINE_ID_WIDTH);
-    JERRY_ASSERT (routine_id_field < ECMA_MAGIC_STRING__COUNT);
+    JERRY_ASSERT ((uint16_t) routine_id_field == routine_id_field);
 
     ecma_builtin_id_t built_in_id = (ecma_builtin_id_t) built_in_id_field;
-    ecma_magic_string_id_t routine_id = (ecma_magic_string_id_t) routine_id_field;
+    uint16_t routine_id = (uint16_t) routine_id_field;
 
     return ecma_builtin_dispatch_routine (built_in_id,
                                           routine_id,
@@ -409,6 +414,7 @@ ecma_builtin_dispatch_call (ecma_object_t *obj_p, /**< built-in object */
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
       case builtin_id: \
       { \
@@ -471,6 +477,7 @@ ecma_builtin_dispatch_construct (ecma_object_t *obj_p, /**< built-in object */
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
     case builtin_id: \
       { \
@@ -512,8 +519,9 @@ ecma_builtin_dispatch_construct (ecma_object_t *obj_p, /**< built-in object */
  */
 static ecma_completion_value_t
 ecma_builtin_dispatch_routine (ecma_builtin_id_t builtin_object_id, /**< built-in object' identifier */
-                               ecma_magic_string_id_t builtin_routine_id, /**< name of the built-in object's
-                                                                               routine property */
+                               uint16_t builtin_routine_id, /**< builtin-wide identifier
+                                                             *   of the built-in object's
+                                                             *   routine property */
                                const ecma_value_t& this_arg_value, /**< 'this' argument value */
                                const ecma_value_t arguments_list [], /**< list of arguments passed to routine */
                                ecma_length_t arguments_number) /**< length of arguments' list */
@@ -525,6 +533,7 @@ ecma_builtin_dispatch_routine (ecma_builtin_id_t builtin_object_id, /**< built-i
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
     case builtin_id: \
       { \
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtins.h b/jerry-core/ecma/builtin-objects/ecma-builtins.h
index 554f6afbc..ad4af8e26 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtins.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtins.h
@@ -28,6 +28,7 @@ typedef enum
                 object_class, \
                 object_prototype_builtin_id, \
                 is_extensible, \
+                is_static, \
                 lowercase_name) \
   builtin_id,
 #include "ecma-builtins.inc.h"
diff --git a/jerry-core/ecma/builtin-objects/ecma-builtins.inc.h b/jerry-core/ecma/builtin-objects/ecma-builtins.inc.h
index a8a0a1bac..393466fa1 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtins.inc.h
+++ b/jerry-core/ecma/builtin-objects/ecma-builtins.inc.h
@@ -1,4 +1,4 @@
-/* Copyright 2014 Samsung Electronics Co., Ltd.
+/* Copyright 2014-2015 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.
@@ -22,6 +22,7 @@ BUILTIN (ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          ECMA_MAGIC_STRING_OBJECT_UL,
          ECMA_BUILTIN_ID__COUNT /* no prototype */,
          true,
+         true,
          object_prototype)
 
 /* The Object object (15.2.1) */
@@ -30,6 +31,7 @@ BUILTIN (ECMA_BUILTIN_ID_OBJECT,
          ECMA_MAGIC_STRING_OBJECT_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          object)
 
 #ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ARRAY_BUILTIN
@@ -39,6 +41,7 @@ BUILTIN (ECMA_BUILTIN_ID_ARRAY_PROTOTYPE,
          ECMA_MAGIC_STRING_ARRAY_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          array_prototype)
 
 /* The Array object (15.4.1) */
@@ -47,6 +50,7 @@ BUILTIN (ECMA_BUILTIN_ID_ARRAY,
          ECMA_MAGIC_STRING_ARRAY_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          true,
+         true,
          array)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ARRAY_BUILTIN*/
 
@@ -57,6 +61,7 @@ BUILTIN (ECMA_BUILTIN_ID_STRING_PROTOTYPE,
          ECMA_MAGIC_STRING_STRING_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          string_prototype)
 
 /* The String object (15.5.1) */
@@ -65,6 +70,7 @@ BUILTIN (ECMA_BUILTIN_ID_STRING,
          ECMA_MAGIC_STRING_STRING_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          true,
+         true,
          string)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_STRING_BUILTIN */
 
@@ -75,6 +81,7 @@ BUILTIN (ECMA_BUILTIN_ID_BOOLEAN_PROTOTYPE,
          ECMA_MAGIC_STRING_BOOLEAN_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          boolean_prototype)
 
 /* The Boolean object (15.6.1) */
@@ -83,6 +90,7 @@ BUILTIN (ECMA_BUILTIN_ID_BOOLEAN,
          ECMA_MAGIC_STRING_BOOLEAN_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          true,
+         true,
          boolean)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_BOOLEAN_BUILTIN */
 
@@ -93,6 +101,7 @@ BUILTIN (ECMA_BUILTIN_ID_NUMBER_PROTOTYPE,
          ECMA_MAGIC_STRING_NUMBER_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          number_prototype)
 
 /* The Number object (15.7.1) */
@@ -101,6 +110,7 @@ BUILTIN (ECMA_BUILTIN_ID_NUMBER,
          ECMA_MAGIC_STRING_NUMBER_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          true,
+         true,
          number)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_NUMBER_BUILTIN */
 
@@ -110,6 +120,7 @@ BUILTIN (ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          ECMA_MAGIC_STRING_FUNCTION_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          function_prototype)
 
 /* The Function object (15.3.1) */
@@ -118,6 +129,7 @@ BUILTIN (ECMA_BUILTIN_ID_FUNCTION,
          ECMA_MAGIC_STRING_FUNCTION_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          true,
+         true,
          function)
 
 #ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_MATH_BUILTIN
@@ -127,6 +139,7 @@ BUILTIN (ECMA_BUILTIN_ID_MATH,
          ECMA_MAGIC_STRING_MATH_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          math)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_MATH_BUILTIN */
 
@@ -137,6 +150,7 @@ BUILTIN (ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          true,
+         true,
          error_prototype)
 
 /* The Error object (15.11.1) */
@@ -145,6 +159,7 @@ BUILTIN (ECMA_BUILTIN_ID_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          error)
 
 /* The EvalError.prototype object (15.11.6.1) */
@@ -153,6 +168,7 @@ BUILTIN (ECMA_BUILTIN_ID_EVAL_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          eval_error_prototype)
 
 /* The EvalError object (15.11.6.1) */
@@ -161,6 +177,7 @@ BUILTIN (ECMA_BUILTIN_ID_EVAL_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_EVAL_ERROR_PROTOTYPE,
          true,
+         true,
          eval_error)
 
 /* The RangeError.prototype object (15.11.6.2) */
@@ -169,6 +186,7 @@ BUILTIN (ECMA_BUILTIN_ID_RANGE_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          range_error_prototype)
 
 /* The RangeError object (15.11.6.2) */
@@ -177,6 +195,7 @@ BUILTIN (ECMA_BUILTIN_ID_RANGE_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_RANGE_ERROR_PROTOTYPE,
          true,
+         true,
          range_error)
 
 /* The ReferenceError.prototype object (15.11.6.3) */
@@ -185,6 +204,7 @@ BUILTIN (ECMA_BUILTIN_ID_REFERENCE_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          reference_error_prototype)
 
 /* The ReferenceError object (15.11.6.3) */
@@ -193,6 +213,7 @@ BUILTIN (ECMA_BUILTIN_ID_REFERENCE_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_REFERENCE_ERROR_PROTOTYPE,
          true,
+         true,
          reference_error)
 
 /* The SyntaxError.prototype object (15.11.6.4) */
@@ -201,6 +222,7 @@ BUILTIN (ECMA_BUILTIN_ID_SYNTAX_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          syntax_error_prototype)
 
 /* The SyntaxError object (15.11.6.4) */
@@ -209,6 +231,7 @@ BUILTIN (ECMA_BUILTIN_ID_SYNTAX_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_SYNTAX_ERROR_PROTOTYPE,
          true,
+         true,
          syntax_error)
 
 /* The TypeError.prototype object (15.11.6.5) */
@@ -217,6 +240,7 @@ BUILTIN (ECMA_BUILTIN_ID_TYPE_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          type_error_prototype)
 
 /* The TypeError object (15.11.6.5) */
@@ -225,6 +249,7 @@ BUILTIN (ECMA_BUILTIN_ID_TYPE_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_TYPE_ERROR_PROTOTYPE,
          true,
+         true,
          type_error)
 
 /* The URIError.prototype object (15.11.6.6) */
@@ -233,6 +258,7 @@ BUILTIN (ECMA_BUILTIN_ID_URI_ERROR_PROTOTYPE,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_ERROR_PROTOTYPE,
          true,
+         true,
          uri_error_prototype)
 
 /* The URIError object (15.11.6.6) */
@@ -241,6 +267,7 @@ BUILTIN (ECMA_BUILTIN_ID_URI_ERROR,
          ECMA_MAGIC_STRING_ERROR_UL,
          ECMA_BUILTIN_ID_URI_ERROR_PROTOTYPE,
          true,
+         true,
          uri_error)
 #endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_ERROR_BUILTINS */
 
@@ -250,6 +277,7 @@ BUILTIN (ECMA_BUILTIN_ID_TYPE_ERROR_THROWER,
          ECMA_MAGIC_STRING_FUNCTION_UL,
          ECMA_BUILTIN_ID_FUNCTION_PROTOTYPE,
          false,
+         true,
          type_error_thrower)
 
 #ifdef CONFIG_ECMA_COMPACT_PROFILE
@@ -259,6 +287,7 @@ BUILTIN (ECMA_BUILTIN_ID_COMPACT_PROFILE_ERROR,
          ECMA_MAGIC_STRING_COMPACT_PROFILE_ERROR_UL,
          ECMA_BUILTIN_ID_OBJECT_PROTOTYPE,
          false,
+         true,
          compact_profile_error)
 #endif /* CONFIG_ECMA_COMPACT_PROFILE */
 
@@ -268,6 +297,16 @@ BUILTIN (ECMA_BUILTIN_ID_GLOBAL,
          ECMA_MAGIC_STRING_OBJECT_UL,
          ECMA_BUILTIN_ID__COUNT /* no prototype */,
          true,
+         true,
          global)
 
+/* Jerry's dynamic extension proxy object */
+BUILTIN (ECMA_BUILTIN_ID_JERRY,
+         ECMA_OBJECT_TYPE_GENERAL,
+         ECMA_MAGIC_STRING_OBJECT_UL,
+         ECMA_BUILTIN_ID__COUNT, /* no prototype */
+         false,
+         false,
+         jerry)
+
 #undef BUILTIN
diff --git a/jerry-core/ecma/builtin-objects/ecma-extension.h b/jerry-core/ecma/builtin-objects/ecma-extension.h
new file mode 100644
index 000000000..313b3d53c
--- /dev/null
+++ b/jerry-core/ecma/builtin-objects/ecma-extension.h
@@ -0,0 +1,40 @@
+/* Copyright 2015 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.
+ */
+
+#ifndef ECMA_EXTENSION_H
+#define ECMA_EXTENSION_H
+
+#include "ecma-globals.h"
+#include "jerry-extension.h"
+
+/**
+ * Maximum number of registered extensions
+ */
+#define ECMA_EXTENSION_MAX_NUMBER_OF_EXTENSIONS (CONFIG_EXTENSION_MAX_NUMBER_OF_EXTENSIONS)
+
+/**
+ * Maximum number of functions in an extension
+ */
+#define ECMA_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION (CONFIG_EXTENSION_MAX_FUNCTIONS_IN_EXTENSION)
+
+/**
+ * Maximum number of arguments in a function
+ */
+#define ECMA_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION (CONFIG_EXTENSION_MAX_ARGUMENTS_IN_FUNCTION)
+
+extern bool ecma_extension_register (jerry_extension_descriptor_t *extension_desc_p);
+extern ecma_property_t* ecma_op_extension_object_get_own_property (ecma_object_t*, ecma_string_t*);
+
+#endif /* ECMA_EXTENSION_H */
diff --git a/jerry-core/ecma/operations/ecma-get-put-value.cpp b/jerry-core/ecma/operations/ecma-get-put-value.cpp
index 0858e0efa..813d56ff1 100644
--- a/jerry-core/ecma/operations/ecma-get-put-value.cpp
+++ b/jerry-core/ecma/operations/ecma-get-put-value.cpp
@@ -25,7 +25,6 @@
 #include "ecma-objects.h"
 #include "ecma-function-object.h"
 #include "ecma-objects-general.h"
-#include "ecma-operations.h"
 #include "ecma-try-catch-macro.h"
 
 /** \addtogroup ecma ECMA
diff --git a/jerry-core/ecma/operations/ecma-objects.cpp b/jerry-core/ecma/operations/ecma-objects.cpp
index 852694229..616e0f418 100644
--- a/jerry-core/ecma/operations/ecma-objects.cpp
+++ b/jerry-core/ecma/operations/ecma-objects.cpp
@@ -16,6 +16,7 @@
 #include "ecma-array-object.h"
 #include "ecma-builtins.h"
 #include "ecma-exceptions.h"
+#include "ecma-extension.h"
 #include "ecma-globals.h"
 #include "ecma-function-object.h"
 #include "ecma-lcache.h"
@@ -58,6 +59,7 @@ ecma_op_object_get (ecma_object_t *obj_p, /**< the object */
     case ECMA_OBJECT_TYPE_FUNCTION:
     case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
     case ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION:
+    case ECMA_OBJECT_TYPE_EXTENSION:
     case ECMA_OBJECT_TYPE_STRING:
     {
       return ecma_op_general_object_get (obj_p, property_name_p);
@@ -121,6 +123,13 @@ ecma_op_object_get_own_property_longpath (ecma_object_t *obj_p, /**< the object
       break;
     }
 
+    case ECMA_OBJECT_TYPE_EXTENSION:
+    {
+      prop_p = ecma_op_extension_object_get_own_property (obj_p, property_name_p);
+
+      break;
+    }
+
     default:
     {
       JERRY_ASSERT (false);
@@ -132,7 +141,8 @@ ecma_op_object_get_own_property_longpath (ecma_object_t *obj_p, /**< the object
   if (unlikely (prop_p == NULL))
   {
     if (is_builtin
-        && type != ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION)
+        && type != ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION
+        && type != ECMA_OBJECT_TYPE_EXTENSION)
     {
       prop_p = ecma_builtin_try_to_instantiate_property (obj_p, property_name_p);
     }
@@ -199,6 +209,7 @@ ecma_op_object_get_property (ecma_object_t *obj_p, /**< the object */
    *   [ECMA_OBJECT_TYPE_FUNCTION]          = &ecma_op_general_object_get_property,
    *   [ECMA_OBJECT_TYPE_BOUND_FUNCTION]    = &ecma_op_general_object_get_property,
    *   [ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION] = &ecma_op_general_object_get_property,
+   *   [ECMA_OBJECT_TYPE_EXTENSION]         = &ecma_op_general_object_get_property,
    *   [ECMA_OBJECT_TYPE_ARGUMENTS]         = &ecma_op_general_object_get_property,
    *   [ECMA_OBJECT_TYPE_STRING]            = &ecma_op_general_object_get_property
    * };
@@ -240,6 +251,7 @@ ecma_op_object_put (ecma_object_t *obj_p, /**< the object */
    *   [ECMA_OBJECT_TYPE_FUNCTION]          = &ecma_op_general_object_put,
    *   [ECMA_OBJECT_TYPE_BOUND_FUNCTION]    = &ecma_op_general_object_put,
    *   [ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION] = &ecma_op_general_object_put,
+   *   [ECMA_OBJECT_TYPE_EXTENSION]         = &ecma_op_general_object_put,
    *   [ECMA_OBJECT_TYPE_ARGUMENTS]         = &ecma_op_general_object_put,
    *   [ECMA_OBJECT_TYPE_STRING]            = &ecma_op_general_object_put
    * };
@@ -279,6 +291,7 @@ ecma_op_object_can_put (ecma_object_t *obj_p, /**< the object */
    *   [ECMA_OBJECT_TYPE_FUNCTION]          = &ecma_op_general_object_can_put,
    *   [ECMA_OBJECT_TYPE_BOUND_FUNCTION]    = &ecma_op_general_object_can_put,
    *   [ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION] = &ecma_op_general_object_can_put,
+   *   [ECMA_OBJECT_TYPE_EXTENSION]         = &ecma_op_general_object_can_put,
    *   [ECMA_OBJECT_TYPE_ARGUMENTS]         = &ecma_op_general_object_can_put,
    *   [ECMA_OBJECT_TYPE_STRING]            = &ecma_op_general_object_can_put
    * };
@@ -317,6 +330,7 @@ ecma_op_object_delete (ecma_object_t *obj_p, /**< the object */
     case ECMA_OBJECT_TYPE_FUNCTION:
     case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
     case ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION:
+    case ECMA_OBJECT_TYPE_EXTENSION:
     case ECMA_OBJECT_TYPE_STRING:
     {
       return ecma_op_general_object_delete (obj_p,
@@ -368,6 +382,7 @@ ecma_op_object_default_value (ecma_object_t *obj_p, /**< the object */
    *   [ECMA_OBJECT_TYPE_FUNCTION]          = &ecma_op_general_object_default_value,
    *   [ECMA_OBJECT_TYPE_BOUND_FUNCTION]    = &ecma_op_general_object_default_value,
    *   [ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION] = &ecma_op_general_object_default_value,
+   *   [ECMA_OBJECT_TYPE_EXTENSION]         = &ecma_op_general_object_default_value,
    *   [ECMA_OBJECT_TYPE_ARGUMENTS]         = &ecma_op_general_object_default_value,
    *   [ECMA_OBJECT_TYPE_STRING]            = &ecma_op_general_object_default_value
    * };
@@ -407,6 +422,7 @@ ecma_op_object_define_own_property (ecma_object_t *obj_p, /**< the object */
     case ECMA_OBJECT_TYPE_FUNCTION:
     case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
     case ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION:
+    case ECMA_OBJECT_TYPE_EXTENSION:
     case ECMA_OBJECT_TYPE_STRING:
     {
       return ecma_op_general_object_define_own_property (obj_p,
@@ -461,6 +477,7 @@ ecma_op_object_has_instance (ecma_object_t *obj_p, /**< the object */
     case ECMA_OBJECT_TYPE_GENERAL:
     case ECMA_OBJECT_TYPE_STRING:
     case ECMA_OBJECT_TYPE_ARGUMENTS:
+    case ECMA_OBJECT_TYPE_EXTENSION:
     {
       return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE));
     }
diff --git a/jerry-core/ecma/operations/ecma-string-object.cpp b/jerry-core/ecma/operations/ecma-string-object.cpp
index 3706fefe1..408b635f2 100644
--- a/jerry-core/ecma/operations/ecma-string-object.cpp
+++ b/jerry-core/ecma/operations/ecma-string-object.cpp
@@ -119,7 +119,7 @@ ecma_op_create_string_object (const ecma_value_t *arguments_list_p, /**< list of
  *         Returned value must be freed with ecma_free_completion_value
  */
 ecma_property_t*
-ecma_op_string_object_get_own_property (ecma_object_t *obj_p, /**< the array object */
+ecma_op_string_object_get_own_property (ecma_object_t *obj_p, /**< the string object */
                                         ecma_string_t *property_name_p) /**< property name */
 {
   JERRY_ASSERT (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_STRING);
diff --git a/jerry-core/jerry-extension.cpp b/jerry-core/jerry-extension.cpp
deleted file mode 100644
index c12848707..000000000
--- a/jerry-core/jerry-extension.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-/* Copyright 2015 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.
- */
-
-#include "config.h"
-#include "jerry-extension.h"
-#include "jrt.h"
-
-/** \addtogroup jerry Jerry engine extension interface
- * @{
- */
-
-/**
- * Buffer of character data (used for exchange between core and extensions' routines)
- */
-char jerry_extension_characters_buffer [CONFIG_EXTENSION_CHAR_BUFFER_SIZE];
-
-/**
- * Extend Global scope with specified extension object
- *
- * After extension the object is accessible through non-configurable property
- * with name equal to builtin_object_name converted to ecma chars.
- */
-void
-jerry_extend_with (const char *builtin_object_name, /**< name of the extension object */
-                   const jerry_extension_descriptor_t *desc_p) /**< description of the extension object */
-{
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS (builtin_object_name, desc_p);
-} /* jerry_extend_with */
-
-/**
- * @}
- */
diff --git a/jerry-core/jerry-extension.h b/jerry-core/jerry-extension.h
index cdfc83b06..a2bb883fd 100644
--- a/jerry-core/jerry-extension.h
+++ b/jerry-core/jerry-extension.h
@@ -29,7 +29,9 @@
 typedef enum
 {
   JERRY_EXTENSION_FIELD_TYPE_BOOLEAN, /**< bool */
-  JERRY_EXTENSION_FIELD_TYPE_FLOAT, /**< float */
+  JERRY_EXTENSION_FIELD_TYPE_FLOAT32, /**< 32-bit float */
+  JERRY_EXTENSION_FIELD_TYPE_FLOAT64, /**< 64-bit float */
+  JERRY_EXTENSION_FIELD_TYPE_UINT32, /**< number converted to 32-bit unsigned integer*/
   JERRY_EXTENSION_FIELD_TYPE_STRING /**< chars buffer */
 } jerry_extension_data_type_t;
 
@@ -38,6 +40,8 @@ typedef enum
  */
 typedef struct
 {
+  const char *field_name_p; /**< field name */
+
   jerry_extension_data_type_t type; /**< field data type */
 
   /**
@@ -45,12 +49,17 @@ typedef struct
    */
   union
   {
-    bool v_boolean; /**< boolean */
-    float v_float; /**< number */
     const char* v_string; /**< string */
+    bool v_bool; /**< boolean */
+    float v_float32; /**< 32-bit float */
+    double v_float64; /**< 64-bit float */
+    uint32_t v_uint32; /**< 32-bit unsigned integer */
   };
 } jerry_extension_field_t;
 
+/**
+ * Description of an extension function's argument
+ */
 typedef struct
 {
   jerry_extension_data_type_t type; /**< argument data type */
@@ -59,7 +68,10 @@ typedef struct
   {
     bool v_bool; /**< boolean */
 
-    float v_float; /**< number converted to float */
+    float v_float32; /**< 32-bit float */
+    double v_float64; /**< 64-bit float */
+
+    uint32_t v_uint32; /**< number converted 32-bit unsigned integer */
 
     /** String copied to external characters buffer (not zero-terminated) */
     struct
@@ -70,13 +82,20 @@ typedef struct
   };
 } jerry_extension_function_arg_t;
 
+/**
+ * Pointer to extension function implementation
+ */
+typedef void (*jerry_extension_function_pointer_t) (const struct jerry_extension_function_t *function_block_p);
+
 /**
  * Description of an extension object's function
  */
-typedef struct
+typedef struct jerry_extension_function_t
 {
   const char* function_name_p; /**< name of function */
 
+  jerry_extension_function_pointer_t function_wrapper_p; /**< pointer to function implementation */
+
   jerry_extension_function_arg_t *args_p; /**< arrays of the function's arguments */
   uint32_t args_number; /**< number of arguments */
 } jerry_extension_function_t;
@@ -84,18 +103,21 @@ typedef struct
 /**
  * Description of an extention object
  */
-typedef struct
+typedef struct jerry_extension_descriptor_t
 {
-  uint32_t fields_count; /**< number of fields */
-  uint32_t functions_count; /**< number of functions */
+  const uint32_t fields_count; /**< number of fields */
+  const uint32_t functions_count; /**< number of functions */
 
-  const jerry_extension_field_t *fields_p; /**< array of field descriptor */
-  const jerry_extension_function_t *functions_p; /**< array of function descriptors */
+  const jerry_extension_field_t* const fields_p; /**< array of field descriptor */
+  const jerry_extension_function_t* const functions_p; /**< array of function descriptors */
+
+  const char* const name_p; /**< name of the extension */
+  struct jerry_extension_descriptor_t *next_p; /**< next descriptor in list of registered extensions */
+  uint32_t index; /**< global index of the extension among registered exceptions */
 } jerry_extension_descriptor_t;
 
-extern void
-jerry_extend_with (const char *builtin_object_name,
-                   const jerry_extension_descriptor_t *desc_p);
+extern bool
+jerry_extend_with (jerry_extension_descriptor_t *desc_p);
 
 /**
  * @}
diff --git a/jerry-core/jerry-extension.inc.h b/jerry-core/jerry-extension.inc.h
new file mode 100644
index 000000000..c3de1f723
--- /dev/null
+++ b/jerry-core/jerry-extension.inc.h
@@ -0,0 +1,110 @@
+/* Copyright 2015 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.
+ */
+
+#include "jerry.h"
+
+/* Counting fields */
+enum
+{
+#define EXTENSION_FIELD(_field_name, _type, _value) \
+  JERRY_EXTENSION_ ## EXTENSION_NAME ## _ ## _field_name,
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FIELD
+  JERRY_EXTENSION_FIELDS_NUMBER
+};
+
+/* Counting functions */
+enum
+{
+#define EXTENSION_FUNCTION(_function_name, _function_wrapper, _args_number, ... /* args */) \
+  JERRY_EXTENSION_ ## EXTENSION_NAME ## _ ## _function_name,
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FUNCTION
+  JERRY_EXTENSION_FUNCTIONS_NUMBER
+};
+
+/* Fields description */
+static const jerry_extension_field_t jerry_extension_fields [JERRY_EXTENSION_FIELDS_NUMBER + 1] =
+{
+#define EXTENSION_FIELD(_field_name, _type, _value) \
+  { # _field_name, JERRY_EXTENSION_FIELD_TYPE_ ## _type, _value },
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FIELD
+};
+
+/* Functions wrapper definitions */
+#define EXTENSION_ARG_PASS_BOOL(_arg_index) \
+  args_p [_arg_index].v_bool
+#define EXTENSION_ARG_PASS_FLOAT32(_arg_index) \
+  args_p [_arg_index].v_float32
+#define EXTENSION_ARG_PASS_FLOAT64(_arg_index) \
+  args_p [_arg_index].v_float64
+#define EXTENSION_ARG_PASS_UINT32(_arg_index) \
+  args_p [_arg_index].v_uint32
+#define EXTENSION_ARG_PASS_STRING(_arg_index) \
+  (const char*) args_p [_arg_index].v_string.chars_p, \
+  args_p [_arg_index].v_string.length
+#define EXTENSION_ARG(_arg_index, _type) EXTENSION_ARG_PASS_ ## _type(_arg_index)
+#define EXTENSION_FUNCTION(_function_name, _function_to_call, _args_number, ...) \
+  static void jerry_extension_ ## _function_name ## _wrapper (const jerry_extension_function_t *function_block_p) \
+  { \
+    const jerry_extension_function_arg_t *args_p = function_block_p->args_p; \
+    _function_to_call (__VA_ARGS__); \
+  }
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FUNCTION
+#undef EXTENSION_ARG
+#undef EXTENSION_ARG_PASS_STRING
+#undef EXTENSION_ARG_PASS_UINT32
+#undef EXTENSION_ARG_PASS_FLOAT64
+#undef EXTENSION_ARG_PASS_FLOAT32
+#undef EXTENSION_ARG_PASS_BOOL
+
+/* Functions' arguments description */
+#define EXTENSION_ARG(_arg_index, _type) [_arg_index] = { \
+  (JERRY_EXTENSION_FIELD_TYPE_ ## _type), \
+  false /* just for initialization, should be overwritten upon call */ \
+}
+#define EXTENSION_FUNCTION(_function_name, _function_to_call, _args_number, ...) \
+  static jerry_extension_function_arg_t jerry_extension_function_ ## _function_name ## _args [_args_number] = { \
+    __VA_ARGS__ \
+  };
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FUNCTION
+#undef EXTENSION_ARG
+
+/* Functions description */
+static const jerry_extension_function_t jerry_extension_functions [JERRY_EXTENSION_FUNCTIONS_NUMBER + 1] =
+{
+#define EXTENSION_FUNCTION(_function_name, _function_wrapper, _args_number, ...) \
+  {  \
+    # _function_name, jerry_extension_ ## _function_name ## _wrapper, \
+    jerry_extension_function_ ## _function_name ## _args, \
+     _args_number \
+  },
+# include EXTENSION_DESCRIPTION_HEADER
+#undef EXTENSION_FUNCTION
+};
+
+static jerry_extension_descriptor_t jerry_extension
+{
+  JERRY_EXTENSION_FIELDS_NUMBER,
+  JERRY_EXTENSION_FUNCTIONS_NUMBER,
+  jerry_extension_fields,
+  jerry_extension_functions,
+  EXTENSION_NAME,
+  NULL,
+  0 /* just for initialization, should be overwritten upon registration */
+};
diff --git a/jerry-core/jerry.cpp b/jerry-core/jerry.cpp
index 3fc04d916..fd7f49006 100644
--- a/jerry-core/jerry.cpp
+++ b/jerry-core/jerry.cpp
@@ -14,7 +14,8 @@
  */
 
 #include "deserializer.h"
-#include "ecma-operations.h"
+#include "ecma-extension.h"
+#include "ecma-init-finalize.h"
 #include "jerry.h"
 #include "jrt.h"
 #include "parser.h"
@@ -41,6 +42,31 @@ const char *jerry_branch_name = JERRY_BRANCH_NAME;
  */
 static jerry_flag_t jerry_flags;
 
+/** \addtogroup jerry Jerry engine extension interface
+ * @{
+ */
+
+/**
+ * Buffer of character data (used for exchange between core and extensions' routines)
+ */
+char jerry_extension_characters_buffer [CONFIG_EXTENSION_CHAR_BUFFER_SIZE];
+
+/**
+ * Extend Global scope with specified extension object
+ *
+ * After extension the object is accessible through non-configurable property
+ * with name equal to builtin_object_name converted to ecma chars.
+ */
+bool
+jerry_extend_with (jerry_extension_descriptor_t *desc_p) /**< description of the extension object */
+{
+  return ecma_extension_register (desc_p);
+} /* jerry_extend_with */
+
+/**
+ * @}
+ */
+
 /**
  * Jerry engine initialization
  */
diff --git a/jerry-core/vm/opcodes-ecma-support.h b/jerry-core/vm/opcodes-ecma-support.h
index 672914a37..481a67660 100644
--- a/jerry-core/vm/opcodes-ecma-support.h
+++ b/jerry-core/vm/opcodes-ecma-support.h
@@ -28,7 +28,6 @@
 #include "ecma-number-arithmetic.h"
 #include "ecma-objects.h"
 #include "ecma-objects-general.h"
-#include "ecma-operations.h"
 #include "ecma-reference.h"
 #include "ecma-try-catch-macro.h"
 #include "deserializer.h"
diff --git a/jerry-core/vm/vm.cpp b/jerry-core/vm/vm.cpp
index 0f9d2240c..13e86c82f 100644
--- a/jerry-core/vm/vm.cpp
+++ b/jerry-core/vm/vm.cpp
@@ -19,7 +19,6 @@
 #include "ecma-globals.h"
 #include "ecma-helpers.h"
 #include "ecma-lex-env.h"
-#include "ecma-operations.h"
 #include "ecma-stack.h"
 #include "jrt.h"
 #include "vm.h"
@@ -397,6 +396,8 @@ run_int (void)
     ret_code = JERRY_COMPLETION_CODE_UNHANDLED_EXCEPTION;
   }
 
+  ecma_free_completion_value (completion);
+
   ecma_deref_object (glob_obj_p);
   ecma_deref_object (lex_env_p);
 
diff --git a/main-linux.cpp b/main-linux.cpp
index 3107625b4..093727cb8 100644
--- a/main-linux.cpp
+++ b/main-linux.cpp
@@ -18,6 +18,8 @@
 
 #include "jerry.h"
 
+#include "plugins/io/init.h"
+
 /**
  * Maximum command line arguments number
  */
@@ -174,7 +176,26 @@ main (int argc,
     }
     else
     {
-      jerry_completion_code_t ret_code = jerry_run_simple (source_p, source_size, flags);
+      jerry_init (flags);
+
+      plugin_io_init ();
+
+      jerry_completion_code_t ret_code = JERRY_COMPLETION_CODE_OK;
+
+      if (!jerry_parse (NULL, source_p, source_size))
+      {
+        /* unhandled SyntaxError */
+        ret_code = JERRY_COMPLETION_CODE_UNHANDLED_EXCEPTION;
+      }
+      else
+      {
+        if ((flags & JERRY_FLAG_PARSE_ONLY) == 0)
+        {
+          ret_code = jerry_run (NULL);
+        }
+      }
+
+      jerry_cleanup ();
 
       if (ret_code == JERRY_COMPLETION_CODE_OK)
       {
diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index f6e545d2f..bcb2807e7 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -36,6 +36,7 @@ project (Jerry_Plugins CXX ASM)
 
 # Include directories
  set(INCLUDE_PLUGINS
+     io
      lib-device-stm)
 
  # Third-party
@@ -58,7 +59,9 @@ project (Jerry_Plugins CXX ASM)
         ${CMAKE_SOURCE_DIR}/third-party/STM32F4-Discovery_FW_V1.1.0)
 
 # Sources
- file(GLOB SOURCE_PLUGINS lib-device-stm/*.cpp)
+ file(GLOB SOURCE_PLUGINS
+      lib-device-stm/*.cpp
+      io/*.cpp)
 
  # Third-party
   # Platform-specific
@@ -80,7 +83,7 @@ project (Jerry_Plugins CXX ASM)
  set(DEFINES_PLUGINS ${DEFINES_PLUGINS_${PLATFORM_EXT}})
  set(INCLUDE_PLUGINS ${INCLUDE_PLUGINS} ${INCLUDE_THIRD_PARTY_${PLATFORM_EXT}})
 
-# Targets declaration 
+# Targets declaration
  string(TOLOWER ${PLATFORM_EXT} PLATFORM_L)
  set(TARGET_NAME plugins.${PLATFORM_L})
 
@@ -88,22 +91,34 @@ project (Jerry_Plugins CXX ASM)
   set(TARGET_NAME ${BUILD_MODE_PREFIX_${BUILD_MODE}}.${TARGET_NAME})
   set(DEFINES_PLUGINS ${DEFINES_PLUGINS} ${DEFINES_PLUGINS_${BUILD_MODE}})
 
-  # Jerry
-   add_library(${TARGET_NAME}.lib STATIC ${SOURCE_PLUGINS})
-   set_property(TARGET ${TARGET_NAME}.lib
-                PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_PLUGINS} ${FLAGS_COMMON_${BUILD_MODE}}")
-   target_compile_definitions(${TARGET_NAME}.lib PRIVATE ${DEFINES_PLUGINS})
-   target_include_directories(${TARGET_NAME}.lib PRIVATE ${INCLUDE_PLUGINS})
+  function(declare_target_with_modifiers ) # modifiers are passed in ARGN implicit argument
+   foreach(MODIFIER ${ARGN})
+    set(TARGET_NAME ${TARGET_NAME}${MODIFIER_SUFFIX_${MODIFIER}})
+   endforeach()
 
-  # Third-party MCU library
-   if(DEFINED SOURCE_THIRD_PARTY_${PLATFORM_EXT})
-    add_library(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} STATIC ${SOURCE_THIRD_PARTY_${PLATFORM_EXT}})
-    set_property(TARGET ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB}
-                 PROPERTY COMPILE_FLAGS "${FLAGS_COMMON_${BUILD_MODE}}")
-    target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} PRIVATE ${INCLUDE_PLUGINS})
+   # Jerry
+    add_library(${TARGET_NAME}.lib STATIC ${SOURCE_PLUGINS})
+    set_property(TARGET ${TARGET_NAME}.lib
+                 PROPERTY COMPILE_FLAGS "${COMPILE_FLAGS_PLUGINS} ${FLAGS_COMMON_${BUILD_MODE}}")
+    target_compile_definitions(${TARGET_NAME}.lib PRIVATE ${DEFINES_PLUGINS})
+    target_include_directories(${TARGET_NAME}.lib PRIVATE ${INCLUDE_PLUGINS} ${INCLUDE_CORE_INTERFACE})
 
-    target_link_libraries(${TARGET_NAME}.lib ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB})
-   endif()
+   # Third-party MCU library
+    if(DEFINED SOURCE_THIRD_PARTY_${PLATFORM_EXT})
+     add_library(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} STATIC ${SOURCE_THIRD_PARTY_${PLATFORM_EXT}})
+     set_property(TARGET ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB}
+                  PROPERTY COMPILE_FLAGS "${FLAGS_COMMON_${BUILD_MODE}}")
+     target_include_directories(${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB} PRIVATE ${INCLUDE_PLUGINS})
+
+     target_link_libraries(${TARGET_NAME}.lib ${TARGET_NAME}${SUFFIX_THIRD_PARTY_LIB})
+    endif()
+  endfunction()
+
+  foreach(MODIFIERS_LIST ${MODIFIERS_LISTS})
+   separate_arguments(MODIFIERS_LIST)
+
+   declare_target_with_modifiers(${MODIFIERS_LIST})
+  endforeach()
  endfunction()
 
  declare_targets_for_build_mode(DEBUG)
diff --git a/plugins/io/init.cpp b/plugins/io/init.cpp
new file mode 100644
index 000000000..51845aaf9
--- /dev/null
+++ b/plugins/io/init.cpp
@@ -0,0 +1,38 @@
+/* Copyright 2015 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.
+ */
+
+#include <stdio.h>
+
+#include "init.h"
+#include "jerry.h"
+
+static void plugin_io_print_uint32 (uint32_t);
+
+#include "io-extension-description.inc.h"
+
+void
+plugin_io_init (void)
+{
+  jerry_extend_with (&jerry_extension);
+} /* plugin_io_init */
+
+/**
+ * Print an uint32 number without new-line to standard output
+ */
+static void
+plugin_io_print_uint32 (uint32_t num) /**< uint32 to print */
+{
+  printf ("%lu", num);
+} /* print_uint32 */
diff --git a/plugins/io/init.h b/plugins/io/init.h
new file mode 100644
index 000000000..cfc2ac634
--- /dev/null
+++ b/plugins/io/init.h
@@ -0,0 +1,21 @@
+/* Copyright 2015 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.
+ */
+
+#ifndef INIT_H
+#define INIT_H
+
+extern void plugin_io_init (void);
+
+#endif /* INIT_H */
diff --git a/plugins/io/io-extension-description.inc.h b/plugins/io/io-extension-description.inc.h
new file mode 100644
index 000000000..56c4c23ff
--- /dev/null
+++ b/plugins/io/io-extension-description.inc.h
@@ -0,0 +1,38 @@
+/* Copyright 2015 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.
+ */
+
+#ifndef IO_EXTENSION_DESCRIPTION_INC_H
+#define IO_EXTENSION_DESCRIPTION_INC_H
+
+#define EXTENSION_NAME "io"
+#define EXTENSION_DESCRIPTION_HEADER "io-extension-description.inc.h"
+
+#include "jerry-extension.inc.h"
+
+#endif /* IO_EXTENSION_DESCRIPTION_INC_H */
+
+#if defined (EXTENSION_FUNCTION)
+EXTENSION_FUNCTION (print_uint32, plugin_io_print_uint32,
+                    1,
+                    EXTENSION_ARG (0, UINT32))
+#elif defined (EXTENSION_FIELD)
+#if defined (__TARGET_HOST)
+EXTENSION_FIELD (platform, STRING, "linux")
+#elif defined (__TARGET_MCU_STM32F3)
+EXTENSION_FIELD (platform, STRING, "mcu_stm32f3")
+#elif defined (__TARGET_MCU_STM32F3)
+EXTENSION_FIELD (platform, STRING, "mcu_stm32f4")
+#endif /* !__TARGET_MCU_STM32F3 && __TARGET_MCU_STM32F4 */
+#endif /* !EXTENSION_FUNCTION && !EXTENSION_FIELD */
diff --git a/tests/jerry/extensions.js b/tests/jerry/extensions.js
new file mode 100644
index 000000000..25803aeed
--- /dev/null
+++ b/tests/jerry/extensions.js
@@ -0,0 +1,32 @@
+// Copyright 2015 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.
+
+// TODO: Test other field types
+// TODO: Test functions
+
+assert(Jerry.io.platform === "linux");
+
+Jerry.io.print_uint32 (1);
+
+try
+{
+  // Argument type mismatch
+  Jerry.io.print_uint32 ('1');
+
+  assert (false);
+}
+catch (e)
+{
+  assert (e instanceof TypeError);
+}