#include "gencgc-alloc-region.h"
#include "genesis/code.h"
-#define PAGE_BYTES GENCGC_PAGE_SIZE
-
void gc_free_heap(void);
inline page_index_t find_page_index(void *);
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
* 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
-/* the number of pages needed for the dynamic space - rounding up */
-#define NUM_PAGES ((page_index_t) ((DYNAMIC_SPACE_SIZE+PAGE_BYTES-1)/PAGE_BYTES))
-
-extern struct page page_table[NUM_PAGES];
+extern unsigned page_table_pages;
+extern struct page *page_table;
\f
/* forward declarations */
page_index_t page_index=(void*)obj - (void *)DYNAMIC_SPACE_START;
return ((page_index >= 0)
&& ((page_index =
- ((unsigned long)page_index)/PAGE_BYTES) < NUM_PAGES)
+ ((unsigned long)page_index)/PAGE_BYTES) < page_table_pages)
&& (page_table[page_index].gen == space));
}