#include <stdio.h>
#include <signal.h>
+#include <sys/ptrace.h>
+#include <linux/user.h>
+#include <errno.h>
#include "runtime.h"
#include "sbcl.h"
#include "os.h"
#include "arch.h"
#include "gc.h"
#include "gc-internal.h"
-
+#include "genesis/vector.h"
+#include "genesis/weak-pointer.h"
+#include "genesis/simple-fun.h"
+#include "genesis/static-symbols.h"
+#include "genesis/symbol.h"
/* assembly language stub that executes trap_PendingInterrupt */
void do_pending_interrupt(void);
/* FIXME: It would be nice to use this symbolic constant instead of
* bare 4096 almost everywhere. We could also use an assertion that
* it's equal to getpagesize(). */
+
#define PAGE_BYTES 4096
/* An array of page structures is statically allocated.
* search of the heap. XX Gencgc obviously needs to be better
* integrated with the Lisp code. */
static int last_free_page;
-static int last_used_page = 0;
\f
/*
* miscellaneous heap functions
/* Count the number of boxed pages within the given
* generation. */
- if (page_table[j].allocated == BOXED_PAGE) {
+ if (page_table[j].allocated & BOXED_PAGE) {
if (page_table[j].large_object)
large_boxed_cnt++;
else
/* Count the number of unboxed pages within the given
* generation. */
- if (page_table[j].allocated == UNBOXED_PAGE) {
+ if (page_table[j].allocated & UNBOXED_PAGE) {
if (page_table[j].large_object)
large_unboxed_cnt++;
else
struct alloc_region boxed_region;
struct alloc_region unboxed_region;
-/* XX hack. Current Lisp code uses the following. Need copying in/out. */
-void *current_region_free_pointer;
-void *current_region_end_addr;
-
/* The generation currently being allocated to. */
static int gc_alloc_generation;
{
int first_page;
int last_page;
- int region_size;
- int restart_page;
int bytes_found;
- int num_pages;
int i;
/*
&& (alloc_region->free_pointer == alloc_region->end_addr));
if (unboxed) {
- restart_page =
+ first_page =
generations[gc_alloc_generation].alloc_unboxed_start_page;
} else {
- restart_page =
+ first_page =
generations[gc_alloc_generation].alloc_start_page;
}
-
- /* Search for a contiguous free region of at least nbytes with the
- * given properties: boxed/unboxed, generation. */
- do {
- first_page = restart_page;
-
- /* First search for a page with at least 32 bytes free, which is
- * not write-protected, and which is not marked dont_move.
- *
- * FIXME: This looks extremely similar, perhaps identical, to
- * code in gc_alloc_large(). It should be shared somehow. */
- while ((first_page < NUM_PAGES)
- && (page_table[first_page].allocated != FREE_PAGE) /* not free page */
- && ((unboxed &&
- (page_table[first_page].allocated != UNBOXED_PAGE))
- || (!unboxed &&
- (page_table[first_page].allocated != BOXED_PAGE))
- || (page_table[first_page].large_object != 0)
- || (page_table[first_page].gen != gc_alloc_generation)
- || (page_table[first_page].bytes_used >= (4096-32))
- || (page_table[first_page].write_protected != 0)
- || (page_table[first_page].dont_move != 0)))
- first_page++;
- /* Check for a failure. */
- if (first_page >= NUM_PAGES) {
- fprintf(stderr,
- "Argh! gc_alloc_new_region failed on first_page, nbytes=%d.\n",
- nbytes);
- print_generation_stats(1);
- lose(NULL);
- }
-
- gc_assert(page_table[first_page].write_protected == 0);
-
- /*
- FSHOW((stderr,
- "/first_page=%d bytes_used=%d\n",
- first_page, page_table[first_page].bytes_used));
- */
-
- /* Now search forward to calculate the available region size. It
- * tries to keeps going until nbytes are found and the number of
- * pages is greater than some level. This helps keep down the
- * number of pages in a region. */
- last_page = first_page;
- bytes_found = 4096 - page_table[first_page].bytes_used;
- num_pages = 1;
- while (((bytes_found < nbytes) || (num_pages < 2))
- && (last_page < (NUM_PAGES-1))
- && (page_table[last_page+1].allocated == FREE_PAGE)) {
- last_page++;
- num_pages++;
- bytes_found += 4096;
- gc_assert(page_table[last_page].write_protected == 0);
- }
-
- region_size = (4096 - page_table[first_page].bytes_used)
+ last_page=gc_find_freeish_pages(&first_page,nbytes,unboxed,alloc_region);
+ bytes_found=(4096 - page_table[first_page].bytes_used)
+ 4096*(last_page-first_page);
- gc_assert(bytes_found == region_size);
-
- /*
- FSHOW((stderr,
- "/last_page=%d bytes_found=%d num_pages=%d\n",
- last_page, bytes_found, num_pages));
- */
-
- restart_page = last_page + 1;
- } while ((restart_page < NUM_PAGES) && (bytes_found < nbytes));
-
- /* Check for a failure. */
- if ((restart_page >= NUM_PAGES) && (bytes_found < nbytes)) {
- fprintf(stderr,
- "Argh! gc_alloc_new_region() failed on restart_page, nbytes=%d.\n",
- nbytes);
- print_generation_stats(1);
- lose(NULL);
- }
-
- /*
- FSHOW((stderr,
- "/gc_alloc_new_region() gen %d: %d bytes: pages %d to %d: addr=%x\n",
- gc_alloc_generation,
- bytes_found,
- first_page,
- last_page,
- page_address(first_page)));
- */
-
/* Set up the alloc_region. */
alloc_region->first_page = first_page;
alloc_region->last_page = last_page;
gc_assert(page_table[first_page].allocated == UNBOXED_PAGE);
else
gc_assert(page_table[first_page].allocated == BOXED_PAGE);
+ page_table[first_page].allocated |= OPEN_REGION_PAGE;
+
gc_assert(page_table[first_page].gen == gc_alloc_generation);
gc_assert(page_table[first_page].large_object == 0);
* broken before!) */
page_table[i].first_object_offset =
alloc_region->start_addr - page_address(i);
+ page_table[i].allocated |= OPEN_REGION_PAGE ;
}
/* Bump up last_free_page. */
last_free_page = last_page+1;
SetSymbolValue(ALLOCATION_POINTER,
(lispobj)(((char *)heap_base) + last_free_page*4096));
- if (last_page+1 > last_used_page)
- last_used_page = last_page+1;
}
}
(*new_areas)[i].size,
first_page,
offset,
- size));*/
+ size);*/
(*new_areas)[i].size += size;
return;
}
}
- /*FSHOW((stderr, "/add_new_area S1 %d %d %d\n", i, c, new_area_start));*/
(*new_areas)[new_areas_index].page = first_page;
(*new_areas)[new_areas_index].offset = offset;
* first_object_offset. */
if (page_table[first_page].bytes_used == 0)
gc_assert(page_table[first_page].first_object_offset == 0);
+ page_table[first_page].allocated &= ~(OPEN_REGION_PAGE);
if (unboxed)
gc_assert(page_table[first_page].allocated == UNBOXED_PAGE);
* first_object_offset pointer to the start of the region, and set
* the bytes_used. */
while (more) {
+ page_table[next_page].allocated &= ~(OPEN_REGION_PAGE);
if (unboxed)
gc_assert(page_table[next_page].allocated == UNBOXED_PAGE);
else
} else {
/* There are no bytes allocated. Unallocate the first_page if
* there are 0 bytes_used. */
+ page_table[first_page].allocated &= ~(OPEN_REGION_PAGE);
if (page_table[first_page].bytes_used == 0)
page_table[first_page].allocated = FREE_PAGE;
}
next_page++;
}
- /* Reset the alloc_region. */
- alloc_region->first_page = 0;
- alloc_region->last_page = -1;
- alloc_region->start_addr = page_address(0);
- alloc_region->free_pointer = page_address(0);
- alloc_region->end_addr = page_address(0);
+ gc_set_region_empty(alloc_region);
}
static inline void *gc_quick_alloc(int nbytes);
{
int first_page;
int last_page;
- int region_size;
- int restart_page;
- int bytes_found;
- int num_pages;
int orig_first_page_bytes_used;
int byte_cnt;
int more;
*/
/* If the object is small, and there is room in the current region
- then allocation it in the current region. */
+ then allocate it in the current region. */
if (!large
&& ((alloc_region->end_addr-alloc_region->free_pointer) >= nbytes))
return gc_quick_alloc(nbytes);
- /* Search for a contiguous free region of at least nbytes. If it's a
- large object then align it on a page boundary by searching for a
- free page. */
-
/* To allow the allocation of small objects without the danger of
using a page in the current boxed region, the search starts after
the current boxed free region. XX could probably keep a page
index ahead of the current region and bumped up here to save a
lot of re-scanning. */
+
if (unboxed) {
- restart_page =
+ first_page =
generations[gc_alloc_generation].alloc_large_unboxed_start_page;
} else {
- restart_page = generations[gc_alloc_generation].alloc_large_start_page;
+ first_page = generations[gc_alloc_generation].alloc_large_start_page;
}
- if (restart_page <= alloc_region->last_page) {
- restart_page = alloc_region->last_page+1;
- }
-
- do {
- first_page = restart_page;
-
- if (large)
- while ((first_page < NUM_PAGES)
- && (page_table[first_page].allocated != FREE_PAGE))
- first_page++;
- else
- /* FIXME: This looks extremely similar, perhaps identical,
- * to code in gc_alloc_new_region(). It should be shared
- * somehow. */
- while ((first_page < NUM_PAGES)
- && (page_table[first_page].allocated != FREE_PAGE)
- && ((unboxed &&
- (page_table[first_page].allocated != UNBOXED_PAGE))
- || (!unboxed &&
- (page_table[first_page].allocated != BOXED_PAGE))
- || (page_table[first_page].large_object != 0)
- || (page_table[first_page].gen != gc_alloc_generation)
- || (page_table[first_page].bytes_used >= (4096-32))
- || (page_table[first_page].write_protected != 0)
- || (page_table[first_page].dont_move != 0)))
- first_page++;
-
- if (first_page >= NUM_PAGES) {
- fprintf(stderr,
- "Argh! gc_alloc_large failed (first_page), nbytes=%d.\n",
- nbytes);
- print_generation_stats(1);
- lose(NULL);
- }
-
- gc_assert(page_table[first_page].write_protected == 0);
-
- /*
- FSHOW((stderr,
- "/first_page=%d bytes_used=%d\n",
- first_page, page_table[first_page].bytes_used));
- */
-
- last_page = first_page;
- bytes_found = 4096 - page_table[first_page].bytes_used;
- num_pages = 1;
- while ((bytes_found < nbytes)
- && (last_page < (NUM_PAGES-1))
- && (page_table[last_page+1].allocated == FREE_PAGE)) {
- last_page++;
- num_pages++;
- bytes_found += 4096;
- gc_assert(page_table[last_page].write_protected == 0);
- }
-
- region_size = (4096 - page_table[first_page].bytes_used)
- + 4096*(last_page-first_page);
-
- gc_assert(bytes_found == region_size);
-
- /*
- FSHOW((stderr,
- "/last_page=%d bytes_found=%d num_pages=%d\n",
- last_page, bytes_found, num_pages));
- */
-
- restart_page = last_page + 1;
- } while ((restart_page < NUM_PAGES) && (bytes_found < nbytes));
-
- /* Check for a failure */
- if ((restart_page >= NUM_PAGES) && (bytes_found < nbytes)) {
- fprintf(stderr,
- "Argh! gc_alloc_large failed (restart_page), nbytes=%d.\n",
- nbytes);
- print_generation_stats(1);
- lose(NULL);
+ if (first_page <= alloc_region->last_page) {
+ first_page = alloc_region->last_page+1;
}
- /*
- if (large)
- FSHOW((stderr,
- "/gc_alloc_large() gen %d: %d of %d bytes: from pages %d to %d: addr=%x\n",
- gc_alloc_generation,
- nbytes,
- bytes_found,
- first_page,
- last_page,
- page_address(first_page)));
- */
+ last_page=gc_find_freeish_pages(&first_page,nbytes,unboxed,0);
gc_assert(first_page > alloc_region->last_page);
if (unboxed)
last_free_page = last_page+1;
SetSymbolValue(ALLOCATION_POINTER,
(lispobj)(((char *)heap_base) + last_free_page*4096));
- if (last_page+1 > last_used_page)
- last_used_page = last_page+1;
}
return((void *)(page_address(first_page)+orig_first_page_bytes_used));
}
+int
+gc_find_freeish_pages(int *restart_page_ptr, int nbytes, int unboxed, struct alloc_region *alloc_region)
+{
+ /* if alloc_region is 0, we assume this is for a potentially large
+ object */
+ int first_page;
+ int last_page;
+ int region_size;
+ int restart_page=*restart_page_ptr;
+ int bytes_found;
+ int num_pages;
+ int large = !alloc_region && (nbytes >= large_object_size);
+
+ /* Search for a contiguous free space of at least nbytes. If it's a
+ large object then align it on a page boundary by searching for a
+ free page. */
+
+ /* To allow the allocation of small objects without the danger of
+ using a page in the current boxed region, the search starts after
+ the current boxed free region. XX could probably keep a page
+ index ahead of the current region and bumped up here to save a
+ lot of re-scanning. */
+
+ do {
+ first_page = restart_page;
+ if (large)
+ while ((first_page < NUM_PAGES)
+ && (page_table[first_page].allocated != FREE_PAGE))
+ first_page++;
+ else
+ while (first_page < NUM_PAGES) {
+ if(page_table[first_page].allocated == FREE_PAGE)
+ break;
+ /* I don't know why we need the gen=0 test, but it
+ * breaks randomly if that's omitted -dan 2003.02.26
+ */
+ if((page_table[first_page].allocated ==
+ (unboxed ? UNBOXED_PAGE : BOXED_PAGE)) &&
+ (page_table[first_page].large_object == 0) &&
+ (gc_alloc_genration == 0) &&
+ (page_table[first_page].gen == gc_alloc_generation) &&
+ (page_table[first_page].bytes_used < (4096-32)) &&
+ (page_table[first_page].write_protected == 0) &&
+ (page_table[first_page].dont_move == 0))
+ break;
+ first_page++;
+ }
+
+ if (first_page >= NUM_PAGES) {
+ fprintf(stderr,
+ "Argh! gc_find_free_space failed (first_page), nbytes=%d.\n",
+ nbytes);
+ print_generation_stats(1);
+ lose(NULL);
+ }
+
+ gc_assert(page_table[first_page].write_protected == 0);
+
+ last_page = first_page;
+ bytes_found = 4096 - page_table[first_page].bytes_used;
+ num_pages = 1;
+ while (((bytes_found < nbytes)
+ || (alloc_region && (num_pages < 2)))
+ && (last_page < (NUM_PAGES-1))
+ && (page_table[last_page+1].allocated == FREE_PAGE)) {
+ last_page++;
+ num_pages++;
+ bytes_found += 4096;
+ gc_assert(page_table[last_page].write_protected == 0);
+ }
+
+ region_size = (4096 - page_table[first_page].bytes_used)
+ + 4096*(last_page-first_page);
+
+ gc_assert(bytes_found == region_size);
+ restart_page = last_page + 1;
+ } while ((restart_page < NUM_PAGES) && (bytes_found < nbytes));
+
+ /* Check for a failure */
+ if ((restart_page >= NUM_PAGES) && (bytes_found < nbytes)) {
+ fprintf(stderr,
+ "Argh! gc_find_freeish_pages failed (restart_page), nbytes=%d.\n",
+ nbytes);
+ print_generation_stats(1);
+ lose(NULL);
+ }
+ *restart_page_ptr=first_page;
+ return last_page;
+}
+
/* Allocate bytes. All the rest of the special-purpose allocation
* functions will eventually call this (instead of just duplicating
* parts of its code) */
void *
-gc_general_alloc(int nbytes,int unboxed_p,int quick_p)
+gc_alloc_with_region(int nbytes,int unboxed_p, struct alloc_region *my_region,
+ int quick_p)
{
void *new_free_pointer;
- struct alloc_region *my_region =
- unboxed_p ? &unboxed_region : &boxed_region;
/* FSHOW((stderr, "/gc_alloc %d\n", nbytes)); */
/* Set up a new region. */
gc_alloc_new_region(32 /*bytes*/, unboxed_p, my_region);
}
+
return((void *)new_obj);
}
/* If so then allocate from the current region. */
void *new_obj = my_region->free_pointer;
my_region->free_pointer = new_free_pointer;
-
/* Check whether the current region is almost empty. */
if ((my_region->end_addr - my_region->free_pointer) <= 32) {
/* If so find, finished with the current region. */
return((void *) NIL); /* dummy value: return something ... */
}
+void *
+gc_general_alloc(int nbytes,int unboxed_p,int quick_p)
+{
+ struct alloc_region *my_region =
+ unboxed_p ? &unboxed_region : &boxed_region;
+ return gc_alloc_with_region(nbytes,unboxed_p, my_region,quick_p);
+}
+
+
static void *
gc_alloc(int nbytes,int unboxed_p)
gc_assert(page_table[next_page].bytes_used >= remaining_bytes);
page_table[next_page].gen = new_space;
- gc_assert(page_table[next_page].allocated = BOXED_PAGE);
+ gc_assert(page_table[next_page].allocated == BOXED_PAGE);
/* Adjust the bytes_used. */
old_bytes_used = page_table[next_page].bytes_used;
/* Skip if already marked dont_move. */
|| (page_table[addr_page_index].dont_move != 0))
return;
-
+ gc_assert(!(page_table[addr_page_index].allocated & OPEN_REGION_PAGE));
/* (Now that we know that addr_page_index is in range, it's
* safe to index into page_table[] with it.) */
region_allocation = page_table[addr_page_index].allocated;
* expensive but important, since it vastly reduces the
* probability that random garbage will be bogusly interpreter as
* a pointer which prevents a page from moving. */
- if (!possibly_valid_dynamic_space_pointer(addr))
+ if (!(possibly_valid_dynamic_space_pointer(addr)))
return;
+ first_page = addr_page_index;
/* Work backwards to find a page with a first_object_offset of 0.
* The pages should be contiguous with all bytes used in the same
* gen. Assumes the first_object_offset is negative or zero. */
- first_page = addr_page_index;
+
+ /* this is probably needlessly conservative. The first object in
+ * the page may not even be the one we were passed a pointer to:
+ * if this is the case, we will write-protect all the previous
+ * object's pages too.
+ */
+
while (page_table[first_page].first_object_offset != 0) {
--first_page;
/* Do some checks. */
/* Skip if it's already write-protected or an unboxed page. */
if (page_table[page].write_protected
- || (page_table[page].allocated == UNBOXED_PAGE))
+ || (page_table[page].allocated & UNBOXED_PAGE))
return (0);
/* Scan the page for pointers to younger generations or the
#endif
for (i = 0; i < last_free_page; i++) {
- if ((page_table[i].allocated == BOXED_PAGE)
+ if ((page_table[i].allocated & BOXED_PAGE)
&& (page_table[i].bytes_used != 0)
&& (page_table[i].gen == generation)) {
int last_page;
* block. */
if ((page_table[last_page].bytes_used < 4096)
/* Or it is 4096 and is the last in the block */
- || (page_table[last_page+1].allocated != BOXED_PAGE)
+ || (!(page_table[last_page+1].allocated & BOXED_PAGE))
|| (page_table[last_page+1].bytes_used == 0)
|| (page_table[last_page+1].gen != generation)
|| (page_table[last_page+1].first_object_offset == 0))
FSHOW((stderr,
"/starting one full scan of newspace generation %d\n",
generation));
-
for (i = 0; i < last_free_page; i++) {
+ /* note that this skips over open regions when it encounters them */
if ((page_table[i].allocated == BOXED_PAGE)
&& (page_table[i].bytes_used != 0)
&& (page_table[i].gen == generation)
* contiguous block */
if ((page_table[last_page].bytes_used < 4096)
/* Or it is 4096 and is the last in the block */
- || (page_table[last_page+1].allocated != BOXED_PAGE)
+ || (!(page_table[last_page+1].allocated & BOXED_PAGE))
|| (page_table[last_page+1].bytes_used == 0)
|| (page_table[last_page+1].gen != generation)
|| (page_table[last_page+1].first_object_offset == 0))
int previous_new_areas_index;
/* Flush the current regions updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
/* Turn on the recording of new areas by gc_alloc(). */
new_areas = current_new_areas;
record_new_objects = 2;
/* Flush the current regions updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
/* Grab new_areas_index. */
current_new_areas_index = new_areas_index;
record_new_objects = 2;
/* Flush the current regions updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
} else {
int offset = (*previous_new_areas)[i].offset;
int size = (*previous_new_areas)[i].size / 4;
gc_assert((*previous_new_areas)[i].size % 4 == 0);
-
scavenge(page_address(page)+offset, size);
}
/* Flush the current regions updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
}
current_new_areas_index = new_areas_index;
/* Does it point to a plausible object? This check slows
* it down a lot (so it's commented out).
*
- * FIXME: Add a variable to enable this dynamically. */
- /* if (!possibly_valid_dynamic_space_pointer((lispobj *)thing)) {
- * lose("ptr %x to invalid object %x", thing, start); */
+ * "a lot" is serious: it ate 50 minutes cpu time on
+ * my duron 950 before I came back from lunch and
+ * killed it.
+ *
+ * FIXME: Add a variable to enable this
+ * dynamically. */
+ /*
+ if (!possibly_valid_dynamic_space_pointer((lispobj *)thing)) {
+ lose("ptr %x to invalid object %x", thing, start);
+ }
+ */
} else {
/* Verify that it points to another valid space. */
if (!to_readonly_space && !to_static_space
gencgc_verify_zero_fill(void)
{
/* Flush the alloc regions updating the tables. */
- boxed_region.free_pointer = current_region_free_pointer;
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
SHOW("verifying zero fill");
verify_zero_fill();
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
}
static void
scavenge_newspace_generation_one_scan(new_space);
/* Flush the current regions, updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
bytes_allocated = bytes_allocated - old_bytes_allocated;
scan_weak_pointers();
/* Flush the current regions, updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
/* Free the pages in oldspace, but not those marked dont_move. */
bytes_freed = free_oldspace();
int gen_to_wp;
int i;
- boxed_region.free_pointer = current_region_free_pointer;
-
FSHOW((stderr, "/entering collect_garbage(%d)\n", last_gen));
if (last_gen > NUM_GENERATIONS) {
}
/* Flush the alloc regions updating the tables. */
- gc_alloc_update_page_tables(0, &boxed_region);
- gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_all_page_tables();
/* Verify the new objects created by Lisp code. */
if (pre_verify_gen_0) {
- SHOW((stderr, "pre-checking generation 0\n"));
+ FSHOW((stderr, "pre-checking generation 0\n"));
verify_generation(0);
}
update_x86_dynamic_space_free_pointer();
- /* This is now done by Lisp SCRUB-CONTROL-STACK in Lisp SUB-GC, so
- * we needn't do it here: */
- /* zero_stack();*/
-
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
-
SHOW("returning from collect_garbage");
}
/* Initialize gc_alloc(). */
gc_alloc_generation = 0;
- boxed_region.first_page = 0;
- boxed_region.last_page = -1;
- boxed_region.start_addr = page_address(0);
- boxed_region.free_pointer = page_address(0);
- boxed_region.end_addr = page_address(0);
- unboxed_region.first_page = 0;
- unboxed_region.last_page = -1;
- unboxed_region.start_addr = page_address(0);
- unboxed_region.free_pointer = page_address(0);
- unboxed_region.end_addr = page_address(0);
-
-#if 0 /* Lisp PURIFY is currently running on the C stack so don't do this. */
- zero_stack();
-#endif
+
+ gc_set_region_empty(&boxed_region);
+ gc_set_region_empty(&unboxed_region);
last_free_page = 0;
SetSymbolValue(ALLOCATION_POINTER, (lispobj)((char *)heap_base));
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
-
if (verify_after_free_heap) {
/* Check whether purify has left any bad pointers. */
if (gencgc_verbose)
generations[i].min_av_mem_age = 0.75;
}
- /* Initialize gc_alloc.
- *
- * FIXME: identical with code in gc_free_heap(), should be shared */
+ /* Initialize gc_alloc. */
gc_alloc_generation = 0;
- boxed_region.first_page = 0;
- boxed_region.last_page = -1;
- boxed_region.start_addr = page_address(0);
- boxed_region.free_pointer = page_address(0);
- boxed_region.end_addr = page_address(0);
- unboxed_region.first_page = 0;
- unboxed_region.last_page = -1;
- unboxed_region.start_addr = page_address(0);
- unboxed_region.free_pointer = page_address(0);
- unboxed_region.end_addr = page_address(0);
+ gc_set_region_empty(&boxed_region);
+ gc_set_region_empty(&unboxed_region);
last_free_page = 0;
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
}
/* Pick up the dynamic space from after a core load.
generations[0].bytes_allocated = 4096*page;
bytes_allocated = 4096*page;
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
}
void
\f
-/* a counter for how deep we are in alloc(..) calls */
-int alloc_entered = 0;
+extern boolean maybe_gc_pending ;
/* alloc(..) is the external interface for memory allocation. It
* allocates to generation 0. It is not called from within the garbage
* collector as it is only external uses that need the check for heap
* (E.g. the most significant word of a 2-word bignum in MOVE-FROM-UNSIGNED.)
*
* The check for a GC trigger is only performed when the current
- * region is full, so in most cases it's not needed. Further MAYBE-GC
- * is only called once because Lisp will remember "need to collect
- * garbage" and get around to it when it can. */
+ * region is full, so in most cases it's not needed. */
+
char *
alloc(int nbytes)
{
+ struct alloc_region *region= &boxed_region;
+ void *new_obj;
+ void *new_free_pointer;
+
/* Check for alignment allocation problems. */
- gc_assert((((unsigned)current_region_free_pointer & 0x7) == 0)
+ gc_assert((((unsigned)region->free_pointer & 0x7) == 0)
&& ((nbytes & 0x7) == 0));
-
- if (SymbolValue(PSEUDO_ATOMIC_ATOMIC)) {/* if already in a pseudo atomic */
-
- void *new_free_pointer;
-
- retry1:
- if (alloc_entered) {
- SHOW("alloc re-entered in already-pseudo-atomic case");
- }
- ++alloc_entered;
-
- /* Check whether there is room in the current region. */
- new_free_pointer = current_region_free_pointer + nbytes;
-
- /* FIXME: Shouldn't we be doing some sort of lock here, to
- * keep from getting screwed if an interrupt service routine
- * allocates memory between the time we calculate new_free_pointer
- * and the time we write it back to current_region_free_pointer?
- * Perhaps I just don't understand pseudo-atomics..
- *
- * Perhaps I don't. It looks as though what happens is if we
- * were interrupted any time during the pseudo-atomic
- * interval (which includes now) we discard the allocated
- * memory and try again. So, at least we don't return
- * a memory area that was allocated out from underneath us
- * by code in an ISR.
- * Still, that doesn't seem to prevent
- * current_region_free_pointer from getting corrupted:
- * We read current_region_free_pointer.
- * They read current_region_free_pointer.
- * They write current_region_free_pointer.
- * We write current_region_free_pointer, scribbling over
- * whatever they wrote. */
-
- if (new_free_pointer <= boxed_region.end_addr) {
- /* If so then allocate from the current region. */
- void *new_obj = current_region_free_pointer;
- current_region_free_pointer = new_free_pointer;
- alloc_entered--;
- return((void *)new_obj);
- }
-
- if (auto_gc_trigger && bytes_allocated > auto_gc_trigger) {
- /* Double the trigger. */
- auto_gc_trigger *= 2;
- alloc_entered--;
- /* Exit the pseudo-atomic. */
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(0));
- if (SymbolValue(PSEUDO_ATOMIC_INTERRUPTED) != 0) {
- /* Handle any interrupts that occurred during
- * gc_alloc(..). */
- do_pending_interrupt();
- }
- funcall0(SymbolFunction(MAYBE_GC));
- /* Re-enter the pseudo-atomic. */
- SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0));
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(1));
- goto retry1;
- }
- /* Call gc_alloc(). */
- boxed_region.free_pointer = current_region_free_pointer;
- {
- void *new_obj = gc_alloc(nbytes,0);
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
- alloc_entered--;
- return (new_obj);
- }
- } else {
- void *result;
- void *new_free_pointer;
-
- retry2:
- /* At least wrap this allocation in a pseudo atomic to prevent
- * gc_alloc() from being re-entered. */
- SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(0));
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(1));
-
- if (alloc_entered)
- SHOW("alloc re-entered in not-already-pseudo-atomic case");
- ++alloc_entered;
-
- /* Check whether there is room in the current region. */
- new_free_pointer = current_region_free_pointer + nbytes;
-
- if (new_free_pointer <= boxed_region.end_addr) {
- /* If so then allocate from the current region. */
- void *new_obj = current_region_free_pointer;
- current_region_free_pointer = new_free_pointer;
- alloc_entered--;
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(0));
- if (SymbolValue(PSEUDO_ATOMIC_INTERRUPTED)) {
- /* Handle any interrupts that occurred during
- * gc_alloc(..). */
- do_pending_interrupt();
- goto retry2;
- }
-
- return((void *)new_obj);
- }
-
- /* KLUDGE: There's lots of code around here shared with the
- * the other branch. Is there some way to factor out the
- * duplicate code? -- WHN 19991129 */
- if (auto_gc_trigger && bytes_allocated > auto_gc_trigger) {
- /* Double the trigger. */
- auto_gc_trigger *= 2;
- alloc_entered--;
- /* Exit the pseudo atomic. */
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(0));
- if (SymbolValue(PSEUDO_ATOMIC_INTERRUPTED) != 0) {
- /* Handle any interrupts that occurred during
- * gc_alloc(..); */
- do_pending_interrupt();
- }
- funcall0(SymbolFunction(MAYBE_GC));
- goto retry2;
- }
-
- /* Else call gc_alloc(). */
- boxed_region.free_pointer = current_region_free_pointer;
- result = gc_alloc(nbytes,0);
- current_region_free_pointer = boxed_region.free_pointer;
- current_region_end_addr = boxed_region.end_addr;
-
- alloc_entered--;
- SetSymbolValue(PSEUDO_ATOMIC_ATOMIC, make_fixnum(0));
- if (SymbolValue(PSEUDO_ATOMIC_INTERRUPTED) != 0) {
- /* Handle any interrupts that occurred during gc_alloc(..). */
- do_pending_interrupt();
- goto retry2;
- }
-
- return result;
+ /* At this point we should either be in pseudo-atomic, or early
+ * enough in cold initn that interrupts are not yet enabled anyway.
+ * It would be nice to assert same.
+ */
+ gc_assert(SymbolValue(PSEUDO_ATOMIC_ATOMIC));
+
+ /* maybe we can do this quickly ... */
+ new_free_pointer = region->free_pointer + nbytes;
+ if (new_free_pointer <= region->end_addr) {
+ new_obj = (void*)(region->free_pointer);
+ region->free_pointer = new_free_pointer;
+ return(new_obj); /* yup */
}
+
+ /* we have to go the long way around, it seems. Check whether
+ * we should GC in the near future
+ */
+ if (auto_gc_trigger && bytes_allocated > auto_gc_trigger) {
+ auto_gc_trigger *= 2;
+ /* set things up so that GC happens when we finish the PA
+ * section. */
+ maybe_gc_pending=1;
+ SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(1));
+ }
+ new_obj = gc_alloc_with_region(nbytes,0,region,0);
+ return (new_obj);
}
+
\f
/*
* noise to manipulate the gc trigger stuff
void
unhandled_sigmemoryfault()
{}
+
+gc_alloc_update_all_page_tables(void)
+{
+ /* Flush the alloc regions updating the tables. */
+ gc_alloc_update_page_tables(1, &unboxed_region);
+ gc_alloc_update_page_tables(0, &boxed_region);
+}
+void
+gc_set_region_empty(struct alloc_region *region)
+{
+ region->first_page = 0;
+ region->last_page = -1;
+ region->start_addr = page_address(0);
+ region->free_pointer = page_address(0);
+ region->end_addr = page_address(0);
+}
+
projects / sbcl.git / blobdiff