Refine comparisons to GC_greatest_plausible_heap_addr

GC_greatest_plausible_heap_addr should always be greater (strictly)
than any address of a heap object.

* backgraph.c (add_back_edges): Check that pointer is strictly less
than GC_greatest_plausible_heap_addr (instead of less or equal).
* dbg_mlc.c [KEEP_BACK_PTRS && ALIGNMENT==1] (GC_get_back_ptr_info):
Likewise.
* include/gc/gc_mark.h (GC_MARK_AND_PUSH): Likewise.
* malloc.c (GC_malloc_kind_global): Likewise.
* typd_mlc.c (GC_typed_mark_proc): Likewise.
* include/gc/gc_mark.h (GC_greatest_plausible_heap_addr): Refine
comment (that any object address is strictly less).
* mark.c (GC_mark_from): Allow descr in assertions to be equal to
GC_greatest_plausible_heap_addr-GC_least_plausible_heap_addr; reformat
comment.

1 files changed, 1 insertions, 1 deletions

diff --git a/malloc.c b/malloc.c
index 6a24da89..61d2061a 100644
--- a/malloc.c
+++ b/malloc.c
@@ -297,7 +297,7 @@ GC_API GC_ATTR_MALLOC void * GC_CALL GC_malloc_kind_global(size_t lb, int k)
             } else {
                 GC_ASSERT(0 == obj_link(op)
                           || ((word)obj_link(op)
-                                <= (word)GC_greatest_plausible_heap_addr
+                                < (word)GC_greatest_plausible_heap_addr
                               && (word)obj_link(op)
                                 >= (word)GC_least_plausible_heap_addr));
                 *opp = obj_link(op);