Implement native function pointer check, addr conversion and register, update documents (#185)

Modified WASM runtime API:
- wasm_runtime_module_malloc()
- wasm_runtime_lookup_function()
Introduced runtime API
- wasm_runtime_register_natives()

core/app-framework/app_framework.cmake

@@ -1,8 +1,15 @@
 # Copyright (C) 2019 Intel Corporation.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+
+add_definitions (-DWASM_ENABLE_APP_FRAMEWORK=1)
+
 set (APP_FRAMEWORK_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR})
 
+if ( NOT DEFINED APP_FRAMEWORK_INCLUDE_TYPE )
+    LIST (APPEND WASM_APP_LIB_SOURCE_ALL ${CMAKE_CURRENT_LIST_DIR}/app_ext_lib_export.c)
+endif()
+
 # app-native-shared and base are required
 include (${APP_FRAMEWORK_ROOT_DIR}/app-native-shared/native_interface.cmake)
 LIST (APPEND WASM_APP_SOURCE_ALL ${NATIVE_INTERFACE_SOURCE})
@@ -31,10 +38,6 @@ function (add_module_native arg)
 
     LIST (APPEND WASM_APP_LIB_SOURCE_ALL ${WASM_APP_LIB_CURRENT_SOURCE})
     set (WASM_APP_LIB_SOURCE_ALL ${WASM_APP_LIB_SOURCE_ALL} PARENT_SCOPE)
-
-    # VARIABLES in function are only used in this scope,
-    # set PARENT_SCOPE to pass to top CMakeLists
-    set (WASM_LIB_BASE_SOURCE ${WASM_LIB_BASE_SOURCE} PARENT_SCOPE)
 endfunction ()
 
 function (add_module_app arg)
@@ -83,4 +86,4 @@ else ()
         endif ()
     ENDFOREACH (dir)
 
-endif()
+endif()