diff --git a/jerry-core/ecma/base/ecma-helpers-string.cpp b/jerry-core/ecma/base/ecma-helpers-string.cpp
index ce1189487..5db16a637 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.cpp
+++ b/jerry-core/ecma/base/ecma-helpers-string.cpp
@@ -20,7 +20,6 @@
  * @{
  */
 
-#include "deserializer.h"
 #include "ecma-alloc.h"
 #include "ecma-gc.h"
 #include "ecma-globals.h"
@@ -28,6 +27,7 @@
 #include "ecma-lcache.h"
 #include "jrt.h"
 #include "jrt-libc-includes.h"
+#include "serializer.h"
 #include "vm.h"
 
 /**
@@ -309,7 +309,7 @@ ecma_init_ecma_string_from_lit_index (ecma_string_t *string_p, /**< descriptor t
   JERRY_ASSERT (is_stack_var == (!mem_is_heap_pointer (string_p)));
 #endif /* !JERRY_NDEBUG */
 
-  const literal lit = deserialize_literal_by_id (lit_index);
+  const literal lit = serializer_get_literal_by_id (lit_index);
   if (lit.type == LIT_MAGIC_STR)
   {
     ecma_init_ecma_string_from_magic_string_id (string_p,
@@ -903,7 +903,7 @@ ecma_string_to_zt_string (const ecma_string_t *string_desc_p, /**< ecma-string d
     }
     case ECMA_STRING_CONTAINER_LIT_TABLE:
     {
-      const literal lit = deserialize_literal_by_id (string_desc_p->u.lit_index);
+      const literal lit = serializer_get_literal_by_id (string_desc_p->u.lit_index);
       JERRY_ASSERT (lit.type == LIT_STR);
       const ecma_char_t *str_p = literal_to_zt (lit);
       JERRY_ASSERT (str_p != NULL);
@@ -1189,7 +1189,7 @@ ecma_compare_ecma_strings_relational (const ecma_string_t *string1_p, /**< ecma-
 
   if (string1_p->container == ECMA_STRING_CONTAINER_LIT_TABLE)
   {
-    const literal lit = deserialize_literal_by_id (string1_p->u.lit_index);
+    const literal lit = serializer_get_literal_by_id (string1_p->u.lit_index);
     JERRY_ASSERT (lit.type == LIT_STR);
     zt_string1_p = literal_to_zt (lit);
   }
@@ -1224,7 +1224,7 @@ ecma_compare_ecma_strings_relational (const ecma_string_t *string1_p, /**< ecma-
 
   if (string2_p->container == ECMA_STRING_CONTAINER_LIT_TABLE)
   {
-    const literal lit = deserialize_literal_by_id (string2_p->u.lit_index);
+    const literal lit = serializer_get_literal_by_id (string2_p->u.lit_index);
     JERRY_ASSERT (lit.type == LIT_STR);
     zt_string2_p = literal_to_zt (lit);
   }
@@ -1286,7 +1286,7 @@ ecma_string_get_length (const ecma_string_t *string_p) /**< ecma-string */
 
   if (container == ECMA_STRING_CONTAINER_LIT_TABLE)
   {
-    const literal lit = deserialize_literal_by_id (string_p->u.lit_index);
+    const literal lit = serializer_get_literal_by_id (string_p->u.lit_index);
 
     return lit.data.lp.length;
   }
diff --git a/jerry-core/jerry.cpp b/jerry-core/jerry.cpp
index 34e2f9656..39f6bc85f 100644
--- a/jerry-core/jerry.cpp
+++ b/jerry-core/jerry.cpp
@@ -15,7 +15,6 @@
 
 #include <stdio.h>
 
-#include "deserializer.h"
 #include "ecma-alloc.h"
 #include "ecma-builtins.h"
 #include "ecma-extension.h"
@@ -762,7 +761,7 @@ jerry_init (jerry_flag_t flags) /**< combination of Jerry flags */
 #endif /* !MEM_STATS */
 
   mem_init ();
-  deserializer_init ();
+  serializer_init ();
   ecma_init ();
 } /* jerry_init */
 
@@ -779,7 +778,7 @@ jerry_cleanup (void)
   bool is_show_mem_stats = ((jerry_flags & JERRY_FLAG_MEM_STATS) != 0);
 
   ecma_finalize ();
-  deserializer_free ();
+  serializer_free ();
   mem_finalize (is_show_mem_stats);
 } /* jerry_cleanup */
 
@@ -838,7 +837,7 @@ jerry_parse (jerry_ctx_t* ctx_p, /**< run context */
   parser_init (source_p, source_size, is_show_opcodes);
   parser_parse_program ();
 
-  const opcode_t* opcodes = (const opcode_t*) deserialize_bytecode ();
+  const opcode_t* opcodes = (const opcode_t*) serializer_get_bytecode ();
 
   serializer_print_opcodes ();
   parser_free ();
diff --git a/jerry-core/parser/collections/lit-id-hash-table.cpp b/jerry-core/parser/collections/lit-id-hash-table.cpp
index a0becf9ec..c61aa4e5a 100644
--- a/jerry-core/parser/collections/lit-id-hash-table.cpp
+++ b/jerry-core/parser/collections/lit-id-hash-table.cpp
@@ -14,9 +14,9 @@
  */
 
 #include "lit-id-hash-table.h"
+#include "bytecode-data.h"
 #include "mem-heap.h"
 #include "jrt-libc-includes.h"
-#include "bytecode-data.h"
 
 lit_id_hash_table *
 lit_id_hash_table_init (size_t buckets_count, size_t blocks_count)
diff --git a/jerry-core/parser/collections/literal.h b/jerry-core/parser/collections/literal.h
deleted file mode 100644
index f8ace2beb..000000000
--- a/jerry-core/parser/collections/literal.h
+++ /dev/null
@@ -1,62 +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.
- */
-
-#ifndef LITERAL_H
-#define LITERAL_H
-
-#include "ecma-globals.h"
-#include "lp-string.h"
-
-typedef enum __attr_packed___
-{
-  LIT_UNKNOWN,
-  LIT_STR,
-  LIT_MAGIC_STR,
-  LIT_NUMBER
-}
-literal_type;
-
-typedef struct
-{
-  union
-  {
-    ecma_magic_string_id_t magic_str_id;
-    ecma_number_t num;
-    lp_string lp;
-    void *none;
-  }
-  data;
-  literal_type type;
-}
-literal;
-
-#define LITERAL_TO_REWRITE (INVALID_VALUE - 1)
-
-literal create_empty_literal (void);
-literal create_literal_from_num (ecma_number_t);
-literal create_literal_from_str (const char *, ecma_length_t);
-literal create_literal_from_str_compute_len (const char *);
-literal create_literal_from_zt (const ecma_char_t *, ecma_length_t);
-bool literal_equal (literal, literal);
-bool literal_equal_s (literal, const char *);
-bool literal_equal_zt (literal, const ecma_char_t *);
-bool literal_equal_num (literal, ecma_number_t);
-bool literal_equal_type (literal, literal);
-bool literal_equal_type_s (literal, const char *);
-bool literal_equal_type_zt (literal, const ecma_char_t *);
-bool literal_equal_type_num (literal, ecma_number_t);
-const ecma_char_t *literal_to_zt (literal);
-
-#endif /* LITERAL_H */
diff --git a/jerry-core/parser/collections/tree.h b/jerry-core/parser/collections/tree.h
deleted file mode 100644
index 4261ddffc..000000000
--- a/jerry-core/parser/collections/tree.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* 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.
- */
-
-#ifndef TREE_H
-#define TREE_H
-
-#include "linked-list.h"
-
-typedef struct tree_header
-{
-  struct tree_header *parent;
-  linked_list children;
-  uint8_t children_num;
-}
-tree_header;
-
-#endif /* TREE_H */
diff --git a/jerry-core/parser/js/bytecode-data.h b/jerry-core/parser/js/bytecode-data.h
index 777644cf1..978d226e2 100644
--- a/jerry-core/parser/js/bytecode-data.h
+++ b/jerry-core/parser/js/bytecode-data.h
@@ -17,24 +17,27 @@
 #define BYTECODE_DATA_H
 
 #include "opcodes.h"
-#include "stack.h"
-#include "jrt-libc-includes.h"
 #include "literal.h"
-#include "scopes-tree.h"
 #include "lit-id-hash-table.h"
 
+/*
+ * All literals are kept in the 'literals' array.
+ * Literal structure doesn't hold real string. All program-specific strings
+ * are kept in the 'strings_buffer' and literal has pointer to this buffer.
+ *
+ * Literal id is its index in 'literals' array of bytecode_data_t structure.
+ *
+ * Bytecode, which is kept in the 'opcodes' field, is divided into blocks
+ * of 'BLOCK_SIZE' operands. Every block has its own numbering of literals.
+ * Literal uid could be in range [0, 127] in every block.
+ *
+ * To map uid to literal id 'lit_id_hash' table is used.
+ */
 #define BLOCK_SIZE 64
 
 typedef struct
 {
-  opcode_counter_t oc;
-  idx_t uid;
-  uint8_t reserved;
-}
-lit_id_table_key;
-
-typedef struct
-{
+  const ecma_char_t *strings_buffer;
   const literal *literals;
   const opcode_t *opcodes;
   lit_id_hash_table *lit_id_hash;
@@ -42,7 +45,4 @@ typedef struct
   opcode_counter_t opcodes_count;
 } bytecode_data_t;
 
-extern bytecode_data_t bytecode_data;
-extern scopes_tree current_scope;
-
 #endif // BYTECODE_DATA_H
diff --git a/jerry-core/parser/js/deserializer.cpp b/jerry-core/parser/js/deserializer.cpp
deleted file mode 100644
index eb1e3cb76..000000000
--- a/jerry-core/parser/js/deserializer.cpp
+++ /dev/null
@@ -1,101 +0,0 @@
-/* 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.
- */
-
-#include "deserializer.h"
-#include "bytecode-data.h"
-#include "ecma-helpers.h"
-
-const ecma_char_t *strings_buffer;
-
-void
-deserializer_set_strings_buffer (const ecma_char_t *s)
-{
-  strings_buffer = s;
-}
-
-literal
-deserialize_literal_by_id (literal_index_t id)
-{
-  JERRY_ASSERT (id != INVALID_LITERAL);
-  JERRY_ASSERT (id < bytecode_data.literals_count);
-  return bytecode_data.literals[id];
-}
-
-literal_index_t
-deserialize_lit_id_by_uid (uint8_t id, opcode_counter_t oc)
-{
-  if (bytecode_data.lit_id_hash == null_hash)
-  {
-    return INVALID_LITERAL;
-  }
-  return lit_id_hash_table_lookup (bytecode_data.lit_id_hash, id, oc);
-}
-
-const void *
-deserialize_bytecode (void)
-{
-  JERRY_ASSERT (bytecode_data.opcodes != NULL);
-  return bytecode_data.opcodes;
-}
-
-opcode_t
-deserialize_opcode (opcode_counter_t oc)
-{
-  if (bytecode_data.opcodes == NULL)
-  {
-    return deserialize_op_meta (oc).op;
-  }
-  JERRY_ASSERT (oc < bytecode_data.opcodes_count);
-  return bytecode_data.opcodes[oc];
-}
-
-op_meta
-deserialize_op_meta (opcode_counter_t oc)
-{
-  JERRY_ASSERT (current_scope);
-  return scopes_tree_op_meta (current_scope, oc);
-}
-
-uint8_t
-deserialize_min_temp (void)
-{
-  return 128;
-}
-
-void
-deserializer_init (void)
-{
-  bytecode_data.literals = NULL;
-  strings_buffer = NULL;
-  bytecode_data.opcodes = NULL;
-}
-
-void
-deserializer_free (void)
-{
-  if (strings_buffer)
-  {
-    mem_heap_free_block ((uint8_t *) strings_buffer);
-  }
-  if (bytecode_data.lit_id_hash != NULL)
-  {
-    lit_id_hash_table_free (bytecode_data.lit_id_hash);
-  }
-  if (bytecode_data.literals != NULL)
-  {
-    mem_heap_free_block ((uint8_t *) bytecode_data.literals);
-  }
-  mem_heap_free_block ((uint8_t *) bytecode_data.opcodes);
-}
diff --git a/jerry-core/parser/js/deserializer.h b/jerry-core/parser/js/deserializer.h
deleted file mode 100644
index 9fbb32fb0..000000000
--- a/jerry-core/parser/js/deserializer.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* 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.
- * 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 DESERIALIZER_H
-#define DESERIALIZER_H
-
-#include "jrt.h"
-#include "ecma-globals.h"
-#include "opcodes.h"
-#include "scopes-tree.h"
-#include "literal.h"
-
-void deserializer_init (void);
-void deserializer_set_strings_buffer (const ecma_char_t *);
-literal deserialize_literal_by_id (literal_index_t);
-literal_index_t deserialize_lit_id_by_uid (uint8_t, opcode_counter_t);
-const void *deserialize_bytecode (void);
-opcode_t deserialize_opcode (opcode_counter_t);
-op_meta deserialize_op_meta (opcode_counter_t);
-uint8_t deserialize_min_temp (void);
-void deserializer_free (void);
-
-#endif //DESERIALIZER_H
diff --git a/jerry-core/parser/js/opcodes-dumper.cpp b/jerry-core/parser/js/opcodes-dumper.cpp
index ab0544115..b8c0e629e 100644
--- a/jerry-core/parser/js/opcodes-dumper.cpp
+++ b/jerry-core/parser/js/opcodes-dumper.cpp
@@ -15,13 +15,13 @@
 
 #include "opcodes-dumper.h"
 #include "serializer.h"
-#include "deserializer.h"
 #include "jrt.h"
 #include "lexer.h"
 #include "stack.h"
 #include "syntax-errors.h"
 #include "jrt-libc-includes.h"
 #include "opcodes-native-call.h"
+#include "serializer.h"
 
 #define MIN_TEMP_NAME 128
 static idx_t temp_name, max_temp_name;
@@ -445,7 +445,7 @@ split_opcode_counter (opcode_counter_t oc, idx_t *id1, idx_t *id2)
 static op_meta
 last_dumped_op_meta (void)
 {
-  return deserialize_op_meta ((opcode_counter_t) (serializer_get_current_opcode_counter () - 1));
+  return serializer_get_op_meta ((opcode_counter_t) (serializer_get_current_opcode_counter () - 1));
 }
 
 static void
@@ -1049,7 +1049,7 @@ dump_varg_header_for_rewrite (varg_list_type vlt, operand obj)
 operand
 rewrite_varg_header_set_args_count (uint8_t args_count)
 {
-  op_meta om = deserialize_op_meta (STACK_TOP (varg_headers));
+  op_meta om = serializer_get_op_meta (STACK_TOP (varg_headers));
   switch (om.op.op_idx)
   {
     case OPCODE (func_expr_n):
@@ -1875,7 +1875,7 @@ rewrite_logical_and_checks (void)
 {
   for (uint8_t i = STACK_TOP (U8); i < STACK_SIZE (logical_and_checks); i++)
   {
-    op_meta jmp_op_meta = deserialize_op_meta (STACK_ELEMENT (logical_and_checks, i));
+    op_meta jmp_op_meta = serializer_get_op_meta (STACK_ELEMENT (logical_and_checks, i));
     JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (is_false_jmp_down));
     idx_t id1, id2;
     split_opcode_counter (get_diff_from (STACK_ELEMENT (logical_and_checks, i)), &id1, &id2);
@@ -1919,7 +1919,7 @@ rewrite_logical_or_checks (void)
 {
   for (uint8_t i = STACK_TOP (U8); i < STACK_SIZE (logical_or_checks); i++)
   {
-    op_meta jmp_op_meta = deserialize_op_meta (STACK_ELEMENT (logical_or_checks, i));
+    op_meta jmp_op_meta = serializer_get_op_meta (STACK_ELEMENT (logical_or_checks, i));
     JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (is_true_jmp_down));
     idx_t id1, id2;
     split_opcode_counter (get_diff_from (STACK_ELEMENT (logical_or_checks, i)), &id1, &id2);
@@ -1955,7 +1955,7 @@ dump_conditional_check_for_rewrite (operand op)
 void
 rewrite_conditional_check (void)
 {
-  op_meta jmp_op_meta = deserialize_op_meta (STACK_TOP (conditional_checks));
+  op_meta jmp_op_meta = serializer_get_op_meta (STACK_TOP (conditional_checks));
   JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (is_false_jmp_down));
   idx_t id1, id2;
   split_opcode_counter (get_diff_from (STACK_TOP (conditional_checks)), &id1, &id2);
@@ -1976,7 +1976,7 @@ dump_jump_to_end_for_rewrite (void)
 void
 rewrite_jump_to_end (void)
 {
-  op_meta jmp_op_meta = deserialize_op_meta (STACK_TOP (jumps_to_end));
+  op_meta jmp_op_meta = serializer_get_op_meta (STACK_TOP (jumps_to_end));
   JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (jmp_down));
   idx_t id1, id2;
   split_opcode_counter (get_diff_from (STACK_TOP (jumps_to_end)), &id1, &id2);
@@ -2167,7 +2167,7 @@ rewrite_breaks (void)
   {
     idx_t id1, id2;
     split_opcode_counter ((opcode_counter_t) (break_target - break_oc), &id1, &id2);
-    op_meta break_op_meta = deserialize_op_meta (break_oc);
+    op_meta break_op_meta = serializer_get_op_meta (break_oc);
     JERRY_ASSERT (break_op_meta.op.op_idx == OPCODE (jmp_down));
     break_op_meta.op.data.jmp_down.opcode_1 = id1;
     break_op_meta.op.data.jmp_down.opcode_2 = id2;
@@ -2189,7 +2189,7 @@ rewrite_continues (void)
   {
     idx_t id1, id2;
     split_opcode_counter ((opcode_counter_t) (continue_target - continue_oc), &id1, &id2);
-    op_meta continue_op_meta = deserialize_op_meta (continue_oc);
+    op_meta continue_op_meta = serializer_get_op_meta (continue_oc);
     JERRY_ASSERT (continue_op_meta.op.op_idx == OPCODE (jmp_down));
     continue_op_meta.op.data.jmp_down.opcode_1 = id1;
     continue_op_meta.op.data.jmp_down.opcode_2 = id2;
@@ -2233,7 +2233,7 @@ rewrite_case_clause (void)
   const opcode_counter_t jmp_oc = STACK_ELEMENT (case_clauses, STACK_HEAD (U8, 2));
   idx_t id1, id2;
   split_opcode_counter (get_diff_from (jmp_oc), &id1, &id2);
-  op_meta jmp_op_meta = deserialize_op_meta (jmp_oc);
+  op_meta jmp_op_meta = serializer_get_op_meta (jmp_oc);
   JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (is_true_jmp_down));
   jmp_op_meta.op.data.is_true_jmp_down.opcode_1 = id1;
   jmp_op_meta.op.data.is_true_jmp_down.opcode_2 = id2;
@@ -2247,7 +2247,7 @@ rewrite_default_clause (void)
   const opcode_counter_t jmp_oc = STACK_TOP (case_clauses);
   idx_t id1, id2;
   split_opcode_counter (get_diff_from (jmp_oc), &id1, &id2);
-  op_meta jmp_op_meta = deserialize_op_meta (jmp_oc);
+  op_meta jmp_op_meta = serializer_get_op_meta (jmp_oc);
   JERRY_ASSERT (jmp_op_meta.op.op_idx == OPCODE (jmp_down));
   jmp_op_meta.op.data.jmp_down.opcode_1 = id1;
   jmp_op_meta.op.data.jmp_down.opcode_2 = id2;
@@ -2286,7 +2286,7 @@ dump_try_for_rewrite (void)
 void
 rewrite_try (void)
 {
-  op_meta try_op_meta = deserialize_op_meta (STACK_TOP (tries));
+  op_meta try_op_meta = serializer_get_op_meta (STACK_TOP (tries));
   JERRY_ASSERT (try_op_meta.op.op_idx == OPCODE (try_block));
   idx_t id1, id2;
   split_opcode_counter (get_diff_from (STACK_TOP (tries)), &id1, &id2);
@@ -2310,7 +2310,7 @@ dump_catch_for_rewrite (operand op)
 void
 rewrite_catch (void)
 {
-  op_meta catch_op_meta = deserialize_op_meta (STACK_TOP (catches));
+  op_meta catch_op_meta = serializer_get_op_meta (STACK_TOP (catches));
   JERRY_ASSERT (catch_op_meta.op.op_idx == OPCODE (meta)
                 && catch_op_meta.op.data.meta.type == OPCODE_META_TYPE_CATCH);
   idx_t id1, id2;
@@ -2332,7 +2332,7 @@ dump_finally_for_rewrite (void)
 void
 rewrite_finally (void)
 {
-  op_meta finally_op_meta = deserialize_op_meta (STACK_TOP (finallies));
+  op_meta finally_op_meta = serializer_get_op_meta (STACK_TOP (finallies));
   JERRY_ASSERT (finally_op_meta.op.op_idx == OPCODE (meta)
                 && finally_op_meta.op.data.meta.type == OPCODE_META_TYPE_FINALLY);
   idx_t id1, id2;
@@ -2363,7 +2363,7 @@ dumper_variable_declaration_exists (literal_index_t lit_id)
   for (opcode_counter_t oc = (opcode_counter_t) (serializer_get_current_opcode_counter () - 1);
        oc > 0; oc--)
   {
-    const op_meta var_decl_op_meta = deserialize_op_meta (oc);
+    const op_meta var_decl_op_meta = serializer_get_op_meta (oc);
     if (var_decl_op_meta.op.op_idx != OPCODE (var_decl))
     {
       break;
@@ -2407,7 +2407,7 @@ void
 rewrite_reg_var_decl (void)
 {
   opcode_counter_t reg_var_decl_oc = STACK_TOP (reg_var_decls);
-  op_meta opm = deserialize_op_meta (reg_var_decl_oc);
+  op_meta opm = serializer_get_op_meta (reg_var_decl_oc);
   JERRY_ASSERT (opm.op.op_idx == OPCODE (reg_var_decl));
   opm.op.data.reg_var_decl.max = max_temp_name;
   serializer_rewrite_op_meta (reg_var_decl_oc, opm);
diff --git a/jerry-core/parser/js/parser.cpp b/jerry-core/parser/js/parser.cpp
index e3186bf8c..a98573dc4 100644
--- a/jerry-core/parser/js/parser.cpp
+++ b/jerry-core/parser/js/parser.cpp
@@ -13,6 +13,8 @@
  * limitations under the License.
  */
 
+#include <stdarg.h>
+
 #include "jrt-libc-includes.h"
 #include "parser.h"
 #include "opcodes.h"
@@ -20,13 +22,12 @@
 #include "vm.h"
 #include "stack.h"
 #include "hash-table.h"
-#include "deserializer.h"
 #include "opcodes-native-call.h"
 #include "scopes-tree.h"
 #include "ecma-helpers.h"
 #include "syntax-errors.h"
 #include "opcodes-dumper.h"
-#include "stdarg.h"
+#include "serializer.h"
 
 #define NESTING_ITERATIONAL 1
 #define NESTING_SWITCH      2
@@ -2713,7 +2714,7 @@ parser_parse_program (void)
   serializer_dump_literals (lexer_get_literals (), lexer_get_literals_count ());
   serializer_merge_scopes_into_bytecode ();
   serializer_set_scope (NULL);
-  deserializer_set_strings_buffer (lexer_get_strings_cache ());
+  serializer_set_strings_buffer (lexer_get_strings_cache ());
 
   scopes_tree_free (STACK_TOP (scopes));
   STACK_DROP (scopes, 1);
@@ -2723,7 +2724,7 @@ void
 parser_init (const char *source, size_t source_size, bool show_opcodes)
 {
   lexer_init (source, source_size, show_opcodes);
-  serializer_init (show_opcodes);
+  serializer_set_show_opcodes (show_opcodes);
   dumper_init ();
   syntax_init ();
 
@@ -2739,6 +2740,5 @@ parser_free (void)
 
   syntax_free ();
   dumper_free ();
-  serializer_free ();
   lexer_free ();
 }
diff --git a/jerry-core/parser/js/scopes-tree.cpp b/jerry-core/parser/js/scopes-tree.cpp
index 6b7898880..11637894c 100644
--- a/jerry-core/parser/js/scopes-tree.cpp
+++ b/jerry-core/parser/js/scopes-tree.cpp
@@ -14,10 +14,10 @@
  */
 
 #include "scopes-tree.h"
+#include "bytecode-data.h"
 #include "mem-heap.h"
 #include "jrt-libc-includes.h"
 #include "lexer.h"
-#include "bytecode-data.h"
 
 #define OPCODE(op) (__op__idx_##op)
 #define HASH_SIZE 128
diff --git a/jerry-core/parser/js/scopes-tree.h b/jerry-core/parser/js/scopes-tree.h
index e5d32cc75..350765fd0 100644
--- a/jerry-core/parser/js/scopes-tree.h
+++ b/jerry-core/parser/js/scopes-tree.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 @@
 #ifndef SCOPES_TREE_H
 #define SCOPES_TREE_H
 
-#include "tree.h"
 #include "linked-list.h"
 #include "lexer.h"
 #include "ecma-globals.h"
@@ -33,6 +32,14 @@ typedef struct
 }
 op_meta;
 
+typedef struct tree_header
+{
+  struct tree_header *parent;
+  linked_list children;
+  uint8_t children_num;
+}
+tree_header;
+
 typedef struct
 {
   tree_header t;
diff --git a/jerry-core/parser/js/serializer.cpp b/jerry-core/parser/js/serializer.cpp
index 5dff032d9..b6eec71a5 100644
--- a/jerry-core/parser/js/serializer.cpp
+++ b/jerry-core/parser/js/serializer.cpp
@@ -13,19 +13,67 @@
  * limitations under the License.
  */
 
-#include "jrt.h"
 #include "serializer.h"
+#include "bytecode-data.h"
+#include "jrt.h"
 #include "parser.h"
 #include "jrt-libc-includes.h"
-#include "bytecode-data.h"
-#include "deserializer.h"
 #include "pretty-printer.h"
 
-bytecode_data_t bytecode_data;
-scopes_tree current_scope;
+static bytecode_data_t bytecode_data;
+static scopes_tree current_scope;
 
 static bool print_opcodes;
 
+op_meta
+serializer_get_op_meta (opcode_counter_t oc)
+{
+  JERRY_ASSERT (current_scope);
+  return scopes_tree_op_meta (current_scope, oc);
+}
+
+opcode_t
+serializer_get_opcode (opcode_counter_t oc)
+{
+  if (bytecode_data.opcodes == NULL)
+  {
+    return serializer_get_op_meta (oc).op;
+  }
+  JERRY_ASSERT (oc < bytecode_data.opcodes_count);
+  return bytecode_data.opcodes[oc];
+}
+
+literal
+serializer_get_literal_by_id (literal_index_t id)
+{
+  JERRY_ASSERT (id != INVALID_LITERAL);
+  JERRY_ASSERT (id < bytecode_data.literals_count);
+  return bytecode_data.literals[id];
+}
+
+literal_index_t
+serializer_get_literal_id_by_uid (uint8_t id, opcode_counter_t oc)
+{
+  if (bytecode_data.lit_id_hash == null_hash)
+  {
+    return INVALID_LITERAL;
+  }
+  return lit_id_hash_table_lookup (bytecode_data.lit_id_hash, id, oc);
+}
+
+const void *
+serializer_get_bytecode (void)
+{
+  JERRY_ASSERT (bytecode_data.opcodes != NULL);
+  return bytecode_data.opcodes;
+}
+
+void
+serializer_set_strings_buffer (const ecma_char_t *s)
+{
+  bytecode_data.strings_buffer = s;
+}
+
 void
 serializer_set_scope (scopes_tree new_scope)
 {
@@ -43,7 +91,7 @@ serializer_merge_scopes_into_bytecode (void)
 }
 
 void
-serializer_dump_literals (const literal literals[], literal_index_t literals_count)
+serializer_dump_literals (const literal *literals, literal_index_t literals_count)
 {
 #ifdef JERRY_ENABLE_PRETTY_PRINTER
   if (print_opcodes)
@@ -131,13 +179,36 @@ serializer_print_opcodes (void)
 }
 
 void
-serializer_init (bool show_opcodes)
+serializer_init ()
 {
   current_scope = NULL;
+  print_opcodes = false;
+
+  bytecode_data.strings_buffer = NULL;
+  bytecode_data.literals = NULL;
+  bytecode_data.opcodes = NULL;
+  bytecode_data.lit_id_hash = null_hash;
+}
+
+void serializer_set_show_opcodes (bool show_opcodes)
+{
   print_opcodes = show_opcodes;
 }
 
 void
 serializer_free (void)
 {
+  if (bytecode_data.strings_buffer)
+  {
+    mem_heap_free_block ((uint8_t *) bytecode_data.strings_buffer);
+  }
+  if (bytecode_data.lit_id_hash != null_hash)
+  {
+    lit_id_hash_table_free (bytecode_data.lit_id_hash);
+  }
+  if (bytecode_data.literals != NULL)
+  {
+    mem_heap_free_block ((uint8_t *) bytecode_data.literals);
+  }
+  mem_heap_free_block ((uint8_t *) bytecode_data.opcodes);
 }
diff --git a/jerry-core/parser/js/serializer.h b/jerry-core/parser/js/serializer.h
index 214c45250..dd06aa4e9 100644
--- a/jerry-core/parser/js/serializer.h
+++ b/jerry-core/parser/js/serializer.h
@@ -23,7 +23,14 @@
 #include "literal.h"
 #include "scopes-tree.h"
 
-void serializer_init (bool show_opcodes);
+void serializer_init ();
+void serializer_set_show_opcodes (bool show_opcodes);
+op_meta serializer_get_op_meta (opcode_counter_t);
+opcode_t serializer_get_opcode (opcode_counter_t);
+literal serializer_get_literal_by_id (literal_index_t);
+literal_index_t serializer_get_literal_id_by_uid (uint8_t, opcode_counter_t);
+const void *serializer_get_bytecode (void);
+void serializer_set_strings_buffer (const ecma_char_t *);
 void serializer_dump_literals (const literal *, literal_index_t);
 void serializer_set_scope (scopes_tree);
 void serializer_merge_scopes_into_bytecode (void);
diff --git a/jerry-core/vm/opcodes-ecma-support.h b/jerry-core/vm/opcodes-ecma-support.h
index 481a67660..80052a66f 100644
--- a/jerry-core/vm/opcodes-ecma-support.h
+++ b/jerry-core/vm/opcodes-ecma-support.h
@@ -30,7 +30,7 @@
 #include "ecma-objects-general.h"
 #include "ecma-reference.h"
 #include "ecma-try-catch-macro.h"
-#include "deserializer.h"
+#include "serializer.h"
 
 bool is_reg_variable (int_data_t *int_data, idx_t var_idx);
 ecma_completion_value_t get_variable_value (int_data_t *, idx_t, bool);
diff --git a/jerry-core/vm/opcodes-ecma-try-catch-finally.cpp b/jerry-core/vm/opcodes-ecma-try-catch-finally.cpp
index 594273c68..0980292bb 100644
--- a/jerry-core/vm/opcodes-ecma-try-catch-finally.cpp
+++ b/jerry-core/vm/opcodes-ecma-try-catch-finally.cpp
@@ -62,8 +62,9 @@ opfunc_try_block (opcode_t opdata, /**< operation data */
       JERRY_ASSERT (next_opcode.op_idx == __op__idx_meta);
       JERRY_ASSERT (next_opcode.data.meta.type == OPCODE_META_TYPE_CATCH_EXCEPTION_IDENTIFIER);
 
-      const literal_index_t catch_exc_val_var_name_lit_idx = deserialize_lit_id_by_uid (next_opcode.data.meta.data_1,
-                                                                                        int_data->pos);
+      const literal_index_t catch_exc_val_var_name_lit_idx = serializer_get_literal_id_by_uid (
+          next_opcode.data.meta.data_1,
+          int_data->pos);
       int_data->pos++;
 
       ecma_string_t *catch_exc_var_name_str_p = ecma_new_ecma_string_from_lit_index (catch_exc_val_var_name_lit_idx);
diff --git a/jerry-core/vm/opcodes-helpers-variables.cpp b/jerry-core/vm/opcodes-helpers-variables.cpp
index b82889e77..6f0156cf7 100644
--- a/jerry-core/vm/opcodes-helpers-variables.cpp
+++ b/jerry-core/vm/opcodes-helpers-variables.cpp
@@ -91,7 +91,7 @@ get_variable_value (int_data_t *int_data, /**< interpreter context */
   else
   {
     ecma_string_t var_name_string;
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (var_idx, int_data->pos);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (var_idx, int_data->pos);
     JERRY_ASSERT (lit_id != INVALID_LITERAL);
     ecma_new_ecma_string_on_stack_from_lit_index (&var_name_string, lit_id);
 
@@ -158,7 +158,7 @@ set_variable_value (int_data_t *int_data, /**< interpreter context */
   else
   {
     ecma_string_t var_name_string;
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (var_idx, lit_oc);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (var_idx, lit_oc);
     JERRY_ASSERT (lit_id != INVALID_LITERAL);
     ecma_new_ecma_string_on_stack_from_lit_index (&var_name_string, lit_id);
 
diff --git a/jerry-core/vm/opcodes-varg.cpp b/jerry-core/vm/opcodes-varg.cpp
index 61f8fd4f0..dcaee0cea 100644
--- a/jerry-core/vm/opcodes-varg.cpp
+++ b/jerry-core/vm/opcodes-varg.cpp
@@ -96,7 +96,8 @@ fill_params_list (int_data_t *int_data, /**< interpreter context */
     JERRY_ASSERT (next_opcode.op_idx == __op__idx_meta);
     JERRY_ASSERT (next_opcode.data.meta.type == OPCODE_META_TYPE_VARG);
 
-    const literal_index_t param_name_lit_idx = deserialize_lit_id_by_uid (next_opcode.data.meta.data_1, int_data->pos);
+    const literal_index_t param_name_lit_idx = serializer_get_literal_id_by_uid (next_opcode.data.meta.data_1,
+                                                                                 int_data->pos);
 
     params_names [param_index] = ecma_new_ecma_string_from_lit_index (param_name_lit_idx);
 
diff --git a/jerry-core/vm/opcodes.cpp b/jerry-core/vm/opcodes.cpp
index 8f74d2e77..2c82191cd 100644
--- a/jerry-core/vm/opcodes.cpp
+++ b/jerry-core/vm/opcodes.cpp
@@ -13,11 +13,11 @@
  * limitations under the License.
  */
 
-#include "deserializer.h"
 #include "jrt.h"
-#include "vm.h"
 #include "opcodes.h"
 #include "opcodes-ecma-support.h"
+#include "serializer.h"
+#include "vm.h"
 
 /**
  * Note:
@@ -98,7 +98,7 @@ opfunc_assignment (opcode_t opdata, /**< operation data */
   }
   else if (type_value_right == OPCODE_ARG_TYPE_STRING)
   {
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (src_val_descr, int_data->pos);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (src_val_descr, int_data->pos);
     ecma_string_t *string_p = ecma_new_ecma_string_from_lit_index (lit_id);
 
     ret_value = set_variable_value (int_data,
@@ -127,8 +127,8 @@ opfunc_assignment (opcode_t opdata, /**< operation data */
   {
     ecma_number_t *num_p = int_data->tmp_num_p;
 
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (src_val_descr, int_data->pos);
-    const literal lit = deserialize_literal_by_id (lit_id);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (src_val_descr, int_data->pos);
+    const literal lit = serializer_get_literal_by_id (lit_id);
     JERRY_ASSERT (lit.type == LIT_NUMBER);
 
     *num_p = lit.data.num;
@@ -142,8 +142,8 @@ opfunc_assignment (opcode_t opdata, /**< operation data */
   {
     ecma_number_t *num_p = int_data->tmp_num_p;
 
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (src_val_descr, int_data->pos);
-    const literal lit = deserialize_literal_by_id (lit_id);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (src_val_descr, int_data->pos);
+    const literal lit = serializer_get_literal_by_id (lit_id);
     JERRY_ASSERT (lit.type == LIT_NUMBER);
 
     *num_p = ecma_number_negate (lit.data.num);
@@ -397,8 +397,8 @@ ecma_completion_value_t
 opfunc_var_decl (opcode_t opdata, /**< operation data */
                  int_data_t *int_data) /**< interpreter context */
 {
-  const literal_index_t lit_id = deserialize_lit_id_by_uid (opdata.data.var_decl.variable_name,
-                                                            int_data->pos);
+  const literal_index_t lit_id = serializer_get_literal_id_by_uid (opdata.data.var_decl.variable_name,
+                                                                   int_data->pos);
   JERRY_ASSERT (lit_id != INVALID_LITERAL);
 
   ecma_string_t *var_name_string_p = ecma_new_ecma_string_from_lit_index (lit_id);
@@ -487,8 +487,8 @@ opfunc_func_decl_n (opcode_t opdata, /**< operation data */
   const idx_t function_name_idx = opdata.data.func_decl_n.name_lit_idx;
   const ecma_length_t params_number = opdata.data.func_decl_n.arg_list;
 
-  literal_index_t function_name_lit_id = deserialize_lit_id_by_uid (function_name_idx,
-                                                                    int_data->pos);
+  literal_index_t function_name_lit_id = serializer_get_literal_id_by_uid (function_name_idx,
+                                                                           int_data->pos);
 
   int_data->pos++;
 
@@ -563,7 +563,7 @@ opfunc_func_expr_n (opcode_t opdata, /**< operation data */
   {
     scope_p = ecma_create_decl_lex_env (int_data->lex_env_p);
 
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (function_name_lit_idx, lit_oc);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (function_name_lit_idx, lit_oc);
     JERRY_ASSERT (lit_id != INVALID_LITERAL);
 
     function_name_string_p = ecma_new_ecma_string_from_lit_index (lit_id);
@@ -1389,7 +1389,7 @@ evaluate_arg_for_typeof (int_data_t *int_data, /**< interpreter context */
   }
   else
   {
-    const literal_index_t lit_id = deserialize_lit_id_by_uid (var_idx, int_data->pos);
+    const literal_index_t lit_id = serializer_get_literal_id_by_uid (var_idx, int_data->pos);
     JERRY_ASSERT (lit_id != INVALID_LITERAL);
 
     ecma_string_t *var_name_string_p = ecma_new_ecma_string_from_lit_index (lit_id);
@@ -1505,7 +1505,7 @@ opfunc_delete_var (opcode_t opdata, /**< operation data */
 
   ecma_completion_value_t ret_value;
 
-  const literal_index_t lit_id = deserialize_lit_id_by_uid (name_lit_idx, lit_oc);
+  const literal_index_t lit_id = serializer_get_literal_id_by_uid (name_lit_idx, lit_oc);
   JERRY_ASSERT (lit_id != INVALID_LITERAL);
 
   ecma_string_t *name_string_p = ecma_new_ecma_string_from_lit_index (lit_id);
diff --git a/jerry-core/vm/pretty-printer.cpp b/jerry-core/vm/pretty-printer.cpp
index 120e2b644..d83ece457 100644
--- a/jerry-core/vm/pretty-printer.cpp
+++ b/jerry-core/vm/pretty-printer.cpp
@@ -13,16 +13,16 @@
  * limitations under the License.
  */
 
-#include "jrt.h"
 #ifdef JERRY_ENABLE_PRETTY_PRINTER
+#include <stdarg.h>
+
 #include "pretty-printer.h"
 #include "jrt-libc-includes.h"
 #include "lexer.h"
-#include "deserializer.h"
 #include "opcodes-native-call.h"
 #include "ecma-helpers.h"
 #include "ecma-globals.h"
-#include <stdarg.h>
+#include "serializer.h"
 
 #define NAME_TO_ID(op) (__op__idx_##op)
 
@@ -79,7 +79,7 @@ dump_literal (literal lit)
 }
 
 void
-pp_literals (const literal lits[], literal_index_t size)
+pp_literals (const literal *lits, literal_index_t size)
 {
   printf ("LITERALS %lu:\n", (unsigned long) size);
   for (literal_index_t i = 0; i < size; i++)
@@ -160,7 +160,7 @@ var_to_str (opcode_t opcode, literal_index_t lit_ids[], opcode_counter_t oc, uin
   }
   else
   {
-    return lit_id_to_str (deserialize_lit_id_by_uid (raw.uids[current_arg], oc));
+    return lit_id_to_str (serializer_get_literal_id_by_uid (raw.uids[current_arg], oc));
   }
 }
 
@@ -241,7 +241,7 @@ pp_op_meta (opcode_counter_t oc, op_meta opm, bool rewrite)
   {
     PP_OP (addition, "%s = %s + %s;");
     PP_OP (substraction, "%s = %s - %s;");
-    PP_OP (division, "%s = %s - %s;");
+    PP_OP (division, "%s = %s / %s;");
     PP_OP (multiplication, "%s = %s * %s;");
     PP_OP (remainder, "%s = %s %% %s;");
     PP_OP (unary_minus, "%s = -%s;");
@@ -447,7 +447,7 @@ pp_op_meta (opcode_counter_t oc, op_meta opm, bool rewrite)
             while ((int16_t) start >= 0 && !found)
             {
               start--;
-              switch (deserialize_opcode (start).op_idx)
+              switch (serializer_get_opcode (start).op_idx)
               {
                 case NAME_TO_ID (call_n):
                 case NAME_TO_ID (native_call):
@@ -462,7 +462,7 @@ pp_op_meta (opcode_counter_t oc, op_meta opm, bool rewrite)
                 }
               }
             }
-            opcode_t start_op = deserialize_opcode (start);
+            opcode_t start_op = serializer_get_opcode (start);
             switch (start_op.op_idx)
             {
               case NAME_TO_ID (call_n):
@@ -527,7 +527,7 @@ pp_op_meta (opcode_counter_t oc, op_meta opm, bool rewrite)
             }
             for (opcode_counter_t counter = start; counter <= oc; counter++)
             {
-              opcode_t meta_op = deserialize_opcode (counter);
+              opcode_t meta_op = serializer_get_opcode (counter);
               switch (meta_op.op_idx)
               {
                 case NAME_TO_ID (meta):
diff --git a/tests/unit/test_preparser.cpp b/tests/unit/test_preparser.cpp
index dad12efd5..0781fed88 100644
--- a/tests/unit/test_preparser.cpp
+++ b/tests/unit/test_preparser.cpp
@@ -18,9 +18,9 @@
 #include "jrt.h"
 #include "mem-allocator.h"
 #include "opcodes.h"
-#include "deserializer.h"
 #include "common.h"
 #include "parser.h"
+#include "serializer.h"
 
 /**
  * Unit test's main function.
@@ -33,7 +33,7 @@ main (int __attr_unused___ argc,
   bool is_ok;
 
   mem_init ();
-  deserializer_init ();
+  serializer_init ();
   parser_init (program, strlen (program), true);
   parser_parse_program ();
   parser_free ();
@@ -47,7 +47,7 @@ main (int __attr_unused___ argc,
     getop_exitval (0)               // exit 0;
   };
 
-  if (!opcodes_equal ((const opcode_t *) deserialize_bytecode (), opcodes, 5))
+  if (!opcodes_equal ((const opcode_t *) serializer_get_bytecode (), opcodes, 5))
   {
     is_ok = false;
   }
@@ -56,7 +56,7 @@ main (int __attr_unused___ argc,
     is_ok = true;
   }
 
-  deserializer_free ();
+  serializer_free ();
   mem_finalize (false);
 
   return (is_ok ? 0 : 1);