Fix '~' operator application to unsigned values shorter than word

Without the fix, unsigned result of "~" operator is zero-extended
to a wide type (word) thus the result has leading zeros (which is
not expected to be).

* dyn_load.c [HAVE_DL_ITERATE_PHDR] (GC_register_dynlib_callback):
Cast (sizeof(word)-1) to word before "~" operation.
* mark.c (GC_mark_from): Likewise.
* mark_rts.c (GC_add_roots_inner, GC_exclude_static_roots): Likewise.
* mark_rts.c [!MSWIN32 && !MSWINCE && !CYGWIN32]
(GC_remove_roots_inner): Likewise.
* os_dep.c [SVR4 || AUX || DGUX || LINUX && SPARC]
(GC_SysVGetDataStart): Likewise.
* os_dep.c [!MSWIN32 && DATASTART_USES_BSDGETDATASTART]
(GC_FreeBSDGetDataStart): Likewise.
* dyn_load.c [(MSWIN32 || MSWINCE || CYGWIN32) && !GC_WIN32_THREADS]
(GC_cond_add_roots): Cast (dwAllocationGranularity-1) to word before
"~" operation.
* include/private/gc_priv.h (HBLKPTR): Cast (HBLKSIZE-1) to word
before "~" operation.
* os_dep.c [USE_WINALLOC || CYGWIN32] (GC_win32_get_mem): Likewise.
* mark.c (GC_mark_from): Change type of new_size local variable from
int to word.
* os_dep.c [OPENBSD] (GC_find_limit_openbsd, GC_skip_hole_openbsd):
Change type of pgsz local variable from size_t to word (to avoid
implicit unsigned value extension after "~" operation).
* os_dep.c [PROC_VDB] (GC_read_dirty): Cast (sizeof(long)-1) to word
before "~" operation.

1 files changed, 3 insertions, 3 deletions

diff --git a/dyn_load.c b/dyn_load.c
index 42534c1e..d6616a52 100644
--- a/dyn_load.c
+++ b/dyn_load.c
@@ -485,8 +485,8 @@ STATIC int GC_register_dynlib_callback(struct dl_phdr_info * info,
           /* rounding to the next multiple of ALIGNMENT, so, most   */
           /* probably, we should remove the corresponding assertion */
           /* check in GC_add_roots_inner along with this code line. */
-          /* start pointer value may require aligning */
-          start = (ptr_t)((word)start & ~(sizeof(word) - 1));
+          /* start pointer value may require aligning.              */
+          start = (ptr_t)((word)start & ~(word)(sizeof(word) - 1));
 #       endif
         if (n_load_segs >= MAX_LOAD_SEGS) {
           if (!load_segs_overflow) {
@@ -926,7 +926,7 @@ GC_INNER void GC_register_dynamic_libraries(void)
 #   else
       char * stack_top
          = (char *)((word)GC_approx_sp() &
-                        ~(GC_sysinfo.dwAllocationGranularity - 1));
+                    ~(word)(GC_sysinfo.dwAllocationGranularity - 1));
 
       if (base == limit) return;
       if ((word)limit > (word)stack_top