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-rw-r--r--gc/include/private/dbg_mlc.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/gc/include/private/dbg_mlc.h b/gc/include/private/dbg_mlc.h
index 5378835..e2003e6 100644
--- a/gc/include/private/dbg_mlc.h
+++ b/gc/include/private/dbg_mlc.h
@@ -115,16 +115,24 @@ typedef struct {
#ifdef SHORT_DBG_HDRS
# define DEBUG_BYTES (sizeof (oh))
+# define UNCOLLECTABLE_DEBUG_BYTES DEBUG_BYTES
#else
/* Add space for END_FLAG, but use any extra space that was already */
/* added to catch off-the-end pointers. */
-# define DEBUG_BYTES (sizeof (oh) + sizeof (word) - EXTRA_BYTES)
+ /* For uncollectable objects, the extra byte is not added. */
+# define UNCOLLECTABLE_DEBUG_BYTES (sizeof (oh) + sizeof (word))
+# define DEBUG_BYTES (UNCOLLECTABLE_DEBUG_BYTES - EXTRA_BYTES)
#endif
#define USR_PTR_FROM_BASE(p) ((ptr_t)(p) + sizeof(oh))
/* Round bytes to words without adding extra byte at end. */
#define SIMPLE_ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1) - 1)
+/* ADD_CALL_CHAIN stores a (partial) call chain into an object */
+/* header. It may be called with or without the allocation */
+/* lock. */
+/* PRINT_CALL_CHAIN prints the call chain stored in an object */
+/* to stderr. It requires that we do not hold the lock. */
#ifdef SAVE_CALL_CHAIN
# define ADD_CALL_CHAIN(base, ra) GC_save_callers(((oh *)(base)) -> oh_ci)
# define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci)