* output the C version in genesis. -- JES, 2006-12-30.
*/
struct page {
- /* This is the offset from the start of the page to the start of
- * the alloc_region which contains/contained it.
+ /* This is the offset from the first byte of some object in memory
+ * prior to and no closer than the start of the page to the start
+ * of the page. Lower values here are better, 0 is ideal. This
+ * is useful for determining where to start when scanning forward
+ * through a heap page (either for conservative root validation or
+ * for scavenging).
*/
- os_vm_size_t region_start_offset;
+ os_vm_size_t scan_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
*/
page_bytes_t bytes_used;
- unsigned
+ unsigned char
/* This is set when the page is write-protected. This should
* always reflect the actual write_protect status of a page.
* (If the page is written into, we catch the exception, make
* written during a GC. */
write_protected_cleared :1,
/* 000 free
- * 10? boxed data
- * 11? boxed code
- * 01? unboxed data
- * ??1 open region
+ * ?01 boxed data
+ * ?10 unboxed data
+ * ?11 code
+ * 1?? open region
+ *
+ * Constants for this field are defined in gc-internal.h, the
+ * xxx_PAGE_FLAG definitions.
*
* If the page is free the following slots are invalid, except
* for the bytes_used which must be zero. */
\f
/* forward declarations */
-
-void sniff_code_object(struct code *code, unsigned long displacement);
+#ifdef LISP_FEATURE_X86
+void sniff_code_object(struct code *code, os_vm_size_t displacement);
void gencgc_apply_code_fixups(struct code *old_code, struct code *new_code);
+#endif
-long update_dynamic_space_free_pointer(void);
+sword_t update_dynamic_space_free_pointer(void);
void gc_alloc_update_page_tables(int page_type_flag, struct alloc_region *alloc_region);
void gc_alloc_update_all_page_tables(void);
void gc_set_region_empty(struct alloc_region *region);