Support external context, heap and lcache (#1778)

JerryScript should support external context, heap and lcache,
so that it can have multiple instances and runtime configurable heap
size.

Related issue: 1746

JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com

jerry-main/CMakeLists.txt

@@ -55,6 +55,10 @@ macro(jerry_create_executable JERRY_NAME)
   install(TARGETS ${JERRY_NAME} DESTINATION bin)
 endmacro()
 
+if(JERRY_LIBC AND FEATURE_EXTERNAL_CONTEXT)
+  MESSAGE(FATAL_ERROR "This configuration is not supported for jerry-main. Please build against your system libc to enable the external context.")
+endif()
+
 # Jerry standalones
 if(JERRY_CMDLINE)
   jerry_create_executable("jerry" "main-unix.c" "cli.c")

jerry-main/main-unix.c

@@ -390,6 +390,20 @@ check_usage (bool condition, /**< the condition that must hold */
   }
 } /* check_usage */
 
+#ifdef JERRY_ENABLE_EXTERNAL_CONTEXT
+
+/**
+ * The alloc function passed to jerry_create_instance
+ */
+static void *
+instance_alloc (size_t size,
+                void *cb_data_p __attribute__((unused)))
+{
+  return malloc (size);
+} /* instance_alloc */
+
+#endif /* JERRY_ENABLE_EXTERNAL_CONTEXT */
+
 int
 main (int argc,
       char **argv)
@@ -560,6 +574,13 @@ main (int argc,
     is_repl_mode = true;
   }
 
+#ifdef JERRY_ENABLE_EXTERNAL_CONTEXT
+
+  jerry_instance_t *instance_p = jerry_create_instance (512*1024, instance_alloc, NULL);
+  jerry_port_default_set_instance (instance_p);
+
+#endif /* JERRY_ENABLE_EXTERNAL_CONTEXT */
+
   jerry_init (flags);
 
   register_js_function ("assert", jerryx_handler_assert);
@@ -764,6 +785,8 @@ main (int argc,
   }
   jerry_release_value (ret_value);
   jerry_cleanup ();
-
+#ifdef JERRY_ENABLE_EXTERNAL_CONTEXT
+  free (instance_p);
+#endif /* JERRY_ENABLE_EXTERNAL_CONTEXT */
   return ret_code;
 } /* main */