New GC_count_set_marks_in_hblk API function

Issue #460 (bdwgc).

Note: available on if the collector is built without NO_DEBUGGING.

* include/gc/gc_mark.h (GC_count_set_marks_in_hblk): New API function.
* reclaim.c [!NO_DEBUGGING] (GC_count_set_marks_in_hblk): Implement.
* tests/gctest.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS && CPPCHECK
&& !NO_DEBUGGING] (main): Call UNTESTED(GC_count_set_marks_in_hblk).

1 files changed, 4 insertions, 0 deletions

diff --git a/reclaim.c b/reclaim.c
index b847fdaf..d3118a38 100644
--- a/reclaim.c
+++ b/reclaim.c
@@ -561,6 +561,10 @@ unsigned GC_n_set_marks(hdr *hhdr)
 
 #endif /* !USE_MARK_BYTES  */
 
+GC_API unsigned GC_CALL GC_count_set_marks_in_hblk(const void *p) {
+    return GC_n_set_marks(HDR(p));
+}
+
 STATIC void GC_CALLBACK GC_print_block_descr(struct hblk *h,
                                 GC_word /* struct PrintStats */ raw_ps)
 {