Enhance wasm loader and interpreter, enhance code security and update document (#149)

samples/littlevgl/wasm-apps/build_wasm_app.sh

@@ -2,8 +2,19 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 #!/bin/sh
+
+WAMR_DIR=${PWD}/../../..
+
+if [ -z $KW_BUILD ] || [ -z $KW_OUT_FILE ];then
+    echo "Local Build Env"
+    makewrap="make"
+else
+    echo "Klocwork Build Env"
+    makewrap="kwinject -o $KW_OUT_FILE make"
+fi
+
 if [ ! -d "lvgl" ]; then
     git clone https://github.com/littlevgl/lvgl.git --branch v5.3
 fi
-make -f Makefile_wasm_app
+$makewrap -f Makefile_wasm_app
 

samples/littlevgl/wasm-apps/src/main.c

@@ -104,7 +104,10 @@ void on_init()
     /* set up a timer */
     user_timer_t timer;
     timer = api_timer_create(10, true, false, timer1_update);
-    api_timer_restart(timer, 10);
+    if (timer)
+        api_timer_restart(timer, 10);
+    else
+        printf("Fail to create timer.\n");
 }
 
 /**********************