+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdio.h>
+#include <dlfcn.h>
+
+extern int profile_func_level;
+int profile_func_level = -1;
+
+/*
+ * Generate instrumentation calls for entry and exit to functions.
+ * Just after function entry and just before function exit, the
+ * following profiling functions are called with the address of the
+ * current function and its call site (currently not use).
+ *
+ * The attribute 'no_instrument_function' causes this instrumentation is
+ * not done.
+ *
+ * These profiling functions print the function names with indentation
+ * and call level.
+ *
+ * To instument a static function, remove temporarily the static specifier.
+ */
+
+void __cyg_profile_func_enter(void *this_fn, void *call_site)
+ __attribute__((no_instrument_function));
+
+void __cyg_profile_func_exit(void *this_fn, void *call_site)
+ __attribute__((no_instrument_function));
+
+/*
+ * The get_function_name() get the function name by calling dladdr()
+ */
+
+static const char *get_function_name(void *func)
+ __attribute__((no_instrument_function));
+
+static const char *
+get_function_name(void *func)
+{
+ Dl_info info;
+ const char *function_name;
+
+ if(dladdr(func, &info))
+ function_name = info.dli_sname;
+ else
+ function_name = NULL;
+ return function_name;
+}
+
+void
+__cyg_profile_func_enter(void *this_fn,
+ void *call_site __attribute__((unused)))
+{
+ int i;
+ const char *function_name;
+
+ if((function_name = get_function_name(this_fn)) != NULL) {
+ profile_func_level += 1;
+ for (i = 0 ; i < profile_func_level ; i++)
+ putchar(' ');
+ printf("[>> %s (%d)]\n", function_name, profile_func_level);
+ }
+ fflush(stdout);
+}
+
+void
+__cyg_profile_func_exit(void *this_fn,
+ void *call_site __attribute__((unused)))
+{
+ int i;
+ const char *function_name;
+
+ if((function_name = get_function_name(this_fn)) != NULL) {
+ for (i = 0 ; i < profile_func_level ; i++)
+ putchar(' ');
+ printf ("[<< %s (%d)]\n", function_name, profile_func_level);
+ profile_func_level -= 1;
+ }
+ fflush(stdout);
+}
projects / tcpdump / commitdiff
