diff --git a/benchmarks/jerry/loop_arithmetics.js b/benchmarks/jerry/loop_arithmetics.js
new file mode 100644
index 000000000..a1537913f
--- /dev/null
+++ b/benchmarks/jerry/loop_arithmetics.js
@@ -0,0 +1,30 @@
+// Copyright 2014 Samsung Electronics Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var count = 10000000;
+var x = 7;
+var y = 3;
+
+var tmp1;
+var tmp2;
+var tmp3;
+var tmp4;
+
+for (var i = 0; i < count; i++)
+{
+  tmp1 = x * x;
+  tmp2 = y * y;
+  tmp3 = tmp1 * tmp1;
+  tmp4 = tmp2 * tmp2;
+}
diff --git a/src/generated.h b/src/generated.h
index 111a64bf9..c46ac9190 100644
--- a/src/generated.h
+++ b/src/generated.h
@@ -16,20 +16,115 @@
 #include "globals.h"
 
 static const char* generated_source = ""
-"var count = 10000;\n"
-"var x = 7;\n"
-"var y = 3;\n"
+"var tmp, a, b = 1, c = 2, d, e = 3, g = 4;\n"
 "\n"
-"var tmp1;\n"
-"var tmp2;\n"
-"var tmp3;\n"
-"var tmp4;\n"
+"var count = 1000;\n"
 "\n"
-"for (var i = 0; i < count; i++)\n"
+"tmp = b * c;\n"
+"a = tmp + g;\n"
+"d = tmp * e + a;\n"
+"\n"
+"var waitTime = 600000;\n"
+"var numOfIterations = 10;\n"
+"\n"
+"while (1)\n"
 "{\n"
-"tmp1 = x * x;\n"
-"tmp2 = y * y;\n"
-"tmp3 = tmp1 * tmp1;\n"
-"tmp4 = tmp2 * tmp2;\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"LEDOn(13);\n"
+"LEDOn(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime * 2);\n"
+"LEDOff(12);\n"
+"LEDOff(13);\n"
+"LEDOff(14);\n"
+"LEDOff(15);\n"
+"wait(waitTime * 2);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime);\n"
+"LEDOff(12);\n"
+"wait(waitTime);\n"
+"LEDOn(13);\n"
+"wait(waitTime);\n"
+"LEDOff(13);\n"
+"wait(waitTime);\n"
+"LEDOn(14);\n"
+"wait(waitTime);\n"
+"LEDOff(14);\n"
+"wait(waitTime);\n"
+"LEDOn(15);\n"
+"wait(waitTime);\n"
+"LEDOff(15);\n"
+"wait(waitTime);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 2);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 3);\n"
+"LEDOff(15);\n"
+"}\n"
+"\n"
+"for (var j = 0; j < numOfIterations; j += 1)\n"
+"{\n"
+"LEDOn(12);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(12);\n"
+"LEDOn(13);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(13);\n"
+"LEDOn(14);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(14);\n"
+"LEDOn(15);\n"
+"wait(waitTime / 6);\n"
+"LEDOff(15);\n"
+"}\n"
 "}\n"
 ;
diff --git a/src/libecmaoperations/ecma-get-put-value.c b/src/libecmaoperations/ecma-get-put-value.c
index f542ca54e..b0b593809 100644
--- a/src/libecmaoperations/ecma-get-put-value.c
+++ b/src/libecmaoperations/ecma-get-put-value.c
@@ -18,8 +18,11 @@
  */
 
 #include "ecma-exceptions.h"
+#include "ecma-gc.h"
+#include "ecma-global-object.h"
 #include "ecma-helpers.h"
 #include "ecma-lex-env.h"
+#include "ecma-objects-properties.h"
 #include "ecma-operations.h"
 
 /** \addtogroup ecma ---TODO---
@@ -135,13 +138,19 @@ ecma_op_put_value(ecma_reference_t ref, /**< ECMA-reference */
       return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_REFERENCE));
     } else // PutValue_3.b
     {
-      /*
-       ecma_object_t *global_object_p = ecma_GetGlobalObject();
+       ecma_object_t *global_object_p = ecma_get_global_object();
 
-       return global_object_p->[[Put]]( ref.referenced_name_p, value, false);
-      */
+       ecma_completion_value_t completion = ecma_op_object_put( global_object_p,
+                                                                ref.referenced_name_p,
+                                                                value,
+                                                                false);
 
-      JERRY_UNIMPLEMENTED();      
+       ecma_deref_object( global_object_p);
+
+       JERRY_ASSERT( ecma_is_completion_value_normal_true( completion)
+                     || ecma_is_completion_value_normal_false( completion) );
+
+       return ecma_make_empty_completion_value();
     }
   } else if ( is_property_reference ) // PutValue_4
   {
diff --git a/src/libecmaoperations/ecma-global-object.c b/src/libecmaoperations/ecma-global-object.c
index e421c7f07..2275c478e 100644
--- a/src/libecmaoperations/ecma-global-object.c
+++ b/src/libecmaoperations/ecma-global-object.c
@@ -14,6 +14,7 @@
  */
 
 #include "globals.h"
+#include "ecma-gc.h"
 #include "ecma-globals.h"
 #include "ecma-global-object.h"
 #include "ecma-helpers.h"
@@ -26,6 +27,27 @@
  * @{
  */
 
+/**
+ * Global object
+ */
+static ecma_object_t* ecma_global_object_p = NULL;
+
+/**
+ * Get Global object
+ *
+ * @return pointer to the Global object
+ *         caller should free the reference by calling ecma_deref_object
+ */
+ecma_object_t*
+ecma_get_global_object( void)
+{
+  JERRY_ASSERT( ecma_global_object_p != NULL );
+
+  ecma_ref_object( ecma_global_object_p);
+
+  return ecma_global_object_p;
+} /* ecma_get_global_object */
+
 /**
  * The Global Object construction routine.
  *
@@ -36,6 +58,8 @@
 ecma_object_t*
 ecma_op_create_global_object( void)
 {
+  JERRY_ASSERT( ecma_global_object_p == NULL );
+
   ecma_object_t *glob_obj_p = ecma_create_object( NULL, true, ECMA_OBJECT_TYPE_GENERAL);
 
   ecma_property_t *undefined_prop_p = ecma_create_named_data_property( glob_obj_p,
@@ -47,6 +71,9 @@ ecma_op_create_global_object( void)
 
   TODO( /* Define NaN, Infinity, eval, parseInt, parseFloat, isNaN, isFinite properties */ );
 
+  ecma_ref_object( glob_obj_p);
+  ecma_global_object_p = glob_obj_p;
+
   return glob_obj_p;
 } /* ecma_op_create_global_object */
 
diff --git a/src/libecmaoperations/ecma-global-object.h b/src/libecmaoperations/ecma-global-object.h
index 60782170a..d0c2cdd61 100644
--- a/src/libecmaoperations/ecma-global-object.h
+++ b/src/libecmaoperations/ecma-global-object.h
@@ -25,6 +25,7 @@
  * @{
  */
 
+extern ecma_object_t* ecma_get_global_object(void);
 extern ecma_object_t* ecma_op_create_global_object( void);
 
 /**
diff --git a/src/libecmaoperations/ecma-objects-properties.c b/src/libecmaoperations/ecma-objects-properties.c
index 008647f9f..e24eafe23 100644
--- a/src/libecmaoperations/ecma-objects-properties.c
+++ b/src/libecmaoperations/ecma-objects-properties.c
@@ -212,7 +212,8 @@ ecma_op_object_put( ecma_object_t *obj_p, /**< the object */
   ecma_property_t *own_desc_p = ecma_op_object_get_own_property( obj_p, property_name_p);
 
   // 3.
-  if ( own_desc_p->type == ECMA_PROPERTY_NAMEDDATA )
+  if ( own_desc_p != NULL
+       && own_desc_p->type == ECMA_PROPERTY_NAMEDDATA )
     {
       // a.
       ecma_property_descriptor_t value_desc = ecma_make_empty_property_descriptor();
@@ -232,7 +233,8 @@ ecma_op_object_put( ecma_object_t *obj_p, /**< the object */
   ecma_property_t *desc_p = ecma_op_object_get_property( obj_p, property_name_p);
 
   // 5.
-  if ( desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
+  if ( desc_p != NULL
+       && desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
     {
       // a.
       ecma_object_t *setter_p = ecma_get_pointer( desc_p->u.named_accessor_property.set_p);
diff --git a/src/main.c b/src/main.c
index 7c8eeefae..e01a6e06a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -130,12 +130,17 @@ read_sources (const char *script_file_names[],
 
       __rewind( file);
 
-      const size_t source_size = (size_t)script_len;
-      size_t bytes_read = 0;
+      const size_t current_source_size = (size_t)script_len;
      
-      while ( bytes_read < source_size )
+      if ( source_buffer_tail + current_source_size >= source_buffer + sizeof(source_buffer) )
         {
-          bytes_read += __fread( source_buffer_tail, 1, source_size, file);
+          jerry_exit (ERR_MEMORY);
+        }
+
+      size_t bytes_read = 0;
+      while ( bytes_read < current_source_size )
+        {
+          bytes_read += __fread( source_buffer_tail + bytes_read, sizeof(uint8_t), current_source_size - bytes_read, file);
 
           if ( __ferror( file) != 0 )
             {
@@ -145,11 +150,14 @@ read_sources (const char *script_file_names[],
 
       __fclose( file);
 
-      source_buffer_tail += source_size;
-
-      *out_source_size_p += source_size;
+      source_buffer_tail += current_source_size;
     }
 
+  const size_t source_size = (size_t) (source_buffer_tail - source_buffer);
+  JERRY_ASSERT( source_size < sizeof(source_buffer) );
+
+  *out_source_size_p = source_size;
+
   return (const char*)source_buffer;
 }
 
diff --git a/tests/jerry/arithmetics.js b/tests/jerry/arithmetics.js
new file mode 100644
index 000000000..5400f2d16
--- /dev/null
+++ b/tests/jerry/arithmetics.js
@@ -0,0 +1,19 @@
+// Copyright 2014 Samsung Electronics Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var a = 1;
+var b = 2;
+
+assertEquals(a+b, 3);
+assertEquals(b+a, 3);
diff --git a/tools/generator.sh b/tools/generator.sh
index af4ae2fa5..d53880610 100755
--- a/tools/generator.sh
+++ b/tools/generator.sh
@@ -14,12 +14,12 @@
 
 #!/bin/bash
 
-echo "#include \"globals.h\"" > "generated.h"
-echo "" >> "generated.h"
-echo "static const char* generated_source = \"\"" >> "generated.h"
+echo "#include \"globals.h\"" > $2
+echo "" >> $2
+echo "static const char* generated_source = \"\"" >> $2
 while read line
 do
-  echo "\"$line\n\"" >> "generated.h"
+  echo "\"$line\n\"" >> $2
 done < $1
-echo ";" >> "generated.h"
+echo ";" >> $2