Fix comparisons to heap boundary in GC_get_back_ptr_info and GC_mark_from

The region delimited by GC_least_plausible_heap_addr and
GC_greatest_plausible_heap_addr might contain part of static data
roots or stacks (in addition to potential heap expansion areas).
Certain comparisons in GC_get_back_ptr_info (when ALIGNMENT is 1) and
in GC_mark_from (in assertions) expect the real heap boundaries.

* alloc.c [SET_REAL_HEAP_BOUNDS] (GC_add_to_heap): Update
GC_least_real_heap_addr and GC_greatest_real_heap_addr variables.
* dbg_mlc.c [KEEP_BACK_PTRS && ALIGNMENT == 1] (GC_get_back_ptr_info):
Compare alternate_target and target to GC_least_real_heap_addr
and GC_greatest_real_heap_addr (instead of GC_least_plausible_heap_addr
and GC_greatest_plausible_heap_addr).
* include/gc/gc_mark.h (GC_greatest_plausible_heap_addr): Refine
comment.
* include/private/gc_priv.h [GC_ASSERTIONS || KEEP_BACK_PTRS
&& ALIGNMENT == 1] (SET_REAL_HEAP_BOUNDS): Define macro.
* include/private/gc_priv.h [GC_ASSERTIONS || KEEP_BACK_PTRS
&& ALIGNMENT == 1] (GC_least_real_heap_addr,
GC_greatest_real_heap_addr): Define (as macro).
* include/private/gc_priv.h [GC_ASSERTIONS || KEEP_BACK_PTRS
&& ALIGNMENT == 1] (_GC_arrays._least_real_heap_addr,
_GC_arrays._greatest_real_heap_addr): New field; add comment.
* mark.c (GC_mark_from): Use GC_greatest_real_heap_addr and
GC_least_real_heap_addr instead of GC_least_plausible_heap_addr and
GC_greatest_plausible_heap_addr, respectively, in assertions.

0 files changed, 0 insertions, 0 deletions