Enable WASI feature, enhance security and add SGX sample (#142)

Change emcc to clang
Refine interpreter to improve perforamnce

core/shared-lib/platform/linux-sgx/bh_definition.c

@@ -52,16 +52,3 @@ int b_strcpy_s(char * s1, size_t s1max, const char * s2)
     return 0;
 }
 
-int fopen_s(FILE ** pFile, const char *filename, const char *mode)
-{
-    if (NULL == pFile || NULL == filename || NULL == mode) {
-        return -1;
-    }
-
-    *pFile = fopen(filename, mode);
-
-    if (NULL == *pFile)
-        return -1;
-
-    return 0;
-}

core/shared-lib/platform/linux-sgx/bh_platform.c

@@ -15,12 +15,35 @@ static bh_print_function_t print_function = NULL;
 
 char *bh_strdup(const char *s)
 {
+    uint32 size;
     char *s1 = NULL;
-    if (s && (s1 = bh_malloc(strlen(s) + 1)))
-        memcpy(s1, s, strlen(s) + 1);
+
+    if (s) {
+        size = (uint32)(strlen(s) + 1);
+        if ((s1 = bh_malloc(size)))
+            bh_memcpy_s(s1, size, s, size);
+    }
     return s1;
 }
 
+const unsigned short ** __ctype_b_loc(void)
+{
+    /* TODO */
+    return NULL;
+}
+
+const int32_t ** __ctype_toupper_loc(void)
+{
+    /* TODO */
+    return NULL;
+}
+
+const int32_t ** __ctype_tolower_loc(void)
+{
+    /* TODO */
+    return NULL;
+}
+
 int bh_platform_init()
 {
     return 0;

core/shared-lib/platform/linux-sgx/bh_platform.h

@@ -14,6 +14,7 @@
 #include <assert.h>
 #include <time.h>
 #include <string.h>
+#include <strings.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
@@ -21,6 +22,7 @@
 #include <ctype.h>
 #include <pthread.h>
 #include <limits.h>
+#include <fcntl.h>
 #include <errno.h>
 
 #ifdef __cplusplus

core/shared-lib/platform/linux-sgx/bh_thread.c

@@ -20,14 +20,14 @@ void vm_thread_sys_destroy(void)
 }
 
 int _vm_thread_create_with_prio(korp_tid *tid, thread_start_routine_t start,
-        void *arg, unsigned int stack_size, int prio)
+                                void *arg, unsigned int stack_size, int prio)
 {
     return BHT_ERROR;
     // return BHT_OK;
 }
 
 int _vm_thread_create(korp_tid *tid, thread_start_routine_t start, void *arg,
-        unsigned int stack_size)
+                      unsigned int stack_size)
 {
     return _vm_thread_create_with_prio(tid, start, arg, stack_size,
                                        BH_THREAD_DEFAULT_PRIORITY);