X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fgencgc-internal.h;h=94e3f09689b3c6b1bfc4184f784d88c0b020acfe;hb=666a3a77ee04225cf861ed8e1e7f378b8438d925;hp=ba56529662cd50c07855292c85791ce1ad86fcc7;hpb=4e5668af19abcf84587bf3f7a1c4294cd92c94a7;p=sbcl.git

diff --git a/src/runtime/gencgc-internal.h b/src/runtime/gencgc-internal.h
index ba56529..94e3f09 100644
--- a/src/runtime/gencgc-internal.h
+++ b/src/runtime/gencgc-internal.h
@@ -39,11 +39,10 @@ int gencgc_handle_wp_violation(void *);
  * output the C version in genesis. -- JES, 2006-12-30.
  */
 struct page {
-    /* The name of this field is not well-chosen for its actual use.
-     * This is the offset from the start of the page to the start
-     * of the alloc_region which contains/contained it.  It's negative or 0
+    /* This is the offset from the start of the page to the start of
+     * the alloc_region which contains/contained it.
      */
-    long  first_object_offset;
+    unsigned long region_start_offset;
 
     /* the number of bytes of this page that are used. This may be less
      * than the actual bytes used for pages within the current
@@ -93,7 +92,7 @@ struct page {
 /* values for the page.allocated field */
 
 
-extern unsigned page_table_pages;
+extern page_index_t page_table_pages;
 extern struct page *page_table;
 
 
@@ -111,14 +110,18 @@ void gc_set_region_empty(struct alloc_region *region);
 /*
  * predicates
  */
+
 static inline boolean
 space_matches_p(lispobj obj, generation_index_t space)
 {
-    page_index_t page_index=(void*)obj - (void *)DYNAMIC_SPACE_START;
-    return ((page_index >= 0)
-            && ((page_index =
-                 ((unsigned long)page_index)/PAGE_BYTES) < page_table_pages)
-            && (page_table[page_index].gen == space));
+    if (obj >= DYNAMIC_SPACE_START) {
+        page_index_t page_index=((pointer_sized_uint_t)obj
+                                 - DYNAMIC_SPACE_START) / PAGE_BYTES;
+        return ((page_index < page_table_pages) &&
+                (page_table[page_index].gen == space));
+    } else {
+        return 0;
+    }
 }
 
 static inline boolean