diff --git a/tools/iself/debug.h b/tools/iself/debug.h
new file mode 100644
index 0000000..9bbf47f
--- /dev/null
+++ b/tools/iself/debug.h
@@ -0,0 +1,90 @@
+#ifndef DEBUG_H
+#define DEBUG_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#define unlikely(expr) __builtin_expect (expr, 0)
+#define likely(expr)   __builtin_expect (expr, 1)
+
+#ifdef DEBUG
+
+    #define FAILIF(cond, msg...) do {                        \
+	if (unlikely(cond)) {                                \
+        fprintf(stderr, "%s(%d): ", __FILE__, __LINE__); \
+		fprintf(stderr, ##msg);                          \
+		exit(1);                                         \
+	}                                                    \
+} while(0)
+
+/* Debug enabled */
+    #define ASSERT(x) do {                                \
+	if (unlikely(!(x))) {                             \
+		fprintf(stderr,                               \
+				"ASSERTION FAILURE %s:%d: [%s]\n",    \
+				__FILE__, __LINE__, #x);              \
+		exit(1);                                      \
+	}                                                 \
+} while(0)
+
+#else
+
+    #define FAILIF(cond, msg...) do { \
+	if (unlikely(cond)) {         \
+		fprintf(stderr, ##msg);   \
+		exit(1);                  \
+	}                             \
+} while(0)
+
+/* No debug */
+    #define ASSERT(x)   do { } while(0)
+
+#endif/* DEBUG */
+
+#define FAILIF_LIBELF(cond, function) \
+    FAILIF(cond, "%s(): %s\n", #function, elf_errmsg(elf_errno()));
+
+static inline void *MALLOC(unsigned int size) {
+    void *m = malloc(size);
+    FAILIF(NULL == m, "malloc(%d) failed!\n", size);
+    return m;
+}
+
+static inline void *CALLOC(unsigned int num_entries, unsigned int entry_size) {
+    void *m = calloc(num_entries, entry_size);
+    FAILIF(NULL == m, "calloc(%d, %d) failed!\n", num_entries, entry_size);
+    return m;
+}
+
+static inline void *REALLOC(void *ptr, unsigned int size) {
+    void *m = realloc(ptr, size);
+    FAILIF(NULL == m, "realloc(%p, %d) failed!\n", ptr, size);
+    return m;
+}
+
+static inline void FREE(void *ptr) {
+    free(ptr);
+}
+
+static inline void FREEIF(void *ptr) {
+    if (ptr) FREE(ptr);
+}
+
+#define PRINT(x...)  do {                             \
+    extern int quiet_flag;                            \
+    if(likely(!quiet_flag))                           \
+        fprintf(stdout, ##x);                         \
+} while(0)
+
+#define ERROR PRINT
+
+#define INFO(x...)  do {                              \
+    extern int verbose_flag;                          \
+    if(unlikely(verbose_flag))                        \
+        fprintf(stdout, ##x);                         \
+} while(0)
+
+/* Prints a hex and ASCII dump of the selected buffer to the selected stream. */
+int dump_hex_buffer(FILE *s, void *b, size_t l, size_t elsize);
+
+#endif/*DEBUG_H*/