research st, add jmp_flow.

+/*
+# for all supports setjmp and longjmp:
+    g++ -g -O0 -o jmp_flow jmp_flow.cpp
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+
+jmp_buf context_level_0;
+
+void func_level_0()
+{
+    const char* level_0_0 = "stack variables for func_level_0";
+    int ret = setjmp(context_level_0);
+    printf("func_level_0 ret=%d\n", ret);
+    if (ret != 0) {
+        printf("call by longjmp.\n");
+        exit(0);
+    }
+}
+
+int main(int argc, char** argv) 
+{
+    func_level_0();
+    longjmp(context_level_0, 1);
+    return 0;
+}

@@ -133,7 +133,8 @@ void func0()
 #endif
 }
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) 
+{
 #if defined(__amd64__) || defined(__x86_64__)
     printf("x86_64 sizeof(long int)=%d, sizeof(long)=%d, "
         "sizeof(int)=%d, __WORDSIZE=%d, __GLIBC__=%d, __GLIBC_MINOR__=%d\n",