inline void *page_address(page_index_t);
int gencgc_handle_wp_violation(void *);
\f
+
+/* Note that this structure is also used from Lisp-side in
+ * src/code/room.lisp, and the Lisp-side structure layout is currently
+ * not groveled from C code but hardcoded. Any changes to the
+ * structure layout need to be also made there.
+ *
+ * FIXME: We should probably just define this structure in Lisp, and
+ * 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
* allocation regions. It should be 0 for all unallocated pages (not
* hard to achieve).
- *
- * Currently declared as an unsigned short to make the struct size
- * smaller. This means that GENCGC-PAGE-SIZE is constrained to fit
- * inside a short.
*/
+#if PAGE_BYTES > USHRT_MAX
+ unsigned int bytes_used;
+#else
unsigned short bytes_used;
-
-#if USHRT_MAX < PAGE_BYTES
-#error "PAGE_BYTES too large"
#endif
unsigned
/* values for the page.allocated field */
\f
-extern unsigned page_table_pages;
+extern page_index_t page_table_pages;
extern struct page *page_table;
\f
/*
* 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