MINOR: debug: add struct ha_caller to describe a calling location
The purpose of this structure is to assemble all constant parts of a
generic calling point for a specific event. These ones are created by
the compiler as a static const element outside of the code path, so
they cost nothing in terms of CPU, and a pointer to that descriptor
can be passed to the place that needs it. This is very similar to what
is being done for the mem_stat stuff.
This will be useful to simplify and improve DEBUG_TASK.
diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index 60b2467..4557002 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -193,6 +193,23 @@
*__x = NULL; \
} while (0)
+/* describes a call place in the code, for example for tracing memory
+ * allocations or task wakeups. These must be declared static const.
+ */
+struct ha_caller {
+ const char *func; // function name
+ const char *file; // file name
+ uint16_t line; // line number
+ uint8_t what; // description of the call, usage specific
+ uint8_t arg8; // optional argument, usage specific
+ uint32_t arg32; // optional argument, usage specific
+};
+
+#define MK_CALLER(_what, _arg8, _arg32) \
+ ({ static const struct ha_caller _ = { \
+ .func = __func__, .file = __FILE__, .line = __LINE__, \
+ .what = _what, .arg8 = _arg8, .arg32 = _arg32 }; \
+ &_; })
/* handle 'tainted' status */
enum tainted_flags {