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-rw-r--r--asmrun/gc.c295
1 files changed, 0 insertions, 295 deletions
diff --git a/asmrun/gc.c b/asmrun/gc.c
deleted file mode 100644
index 285c239a1..000000000
--- a/asmrun/gc.c
+++ /dev/null
@@ -1,295 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include "misc.h"
-#include "mlvalues.h"
-
-char * young_start, * young_ptr, * young_end;
-char * old_start, * old_ptr, * old_end;
-value ** remembered_start, ** remembered_ptr, ** remembered_end;
-
-/* Heap initialization */
-
-int young_size = 32 * sizeof(value) * 1024; /* 128K / 256K */
-int old_size = 256 * sizeof(value) * 1024; /* 1M / 2M */
-int remembered_size = 4096;
-
-void init_heap()
-{
- young_start = malloc(young_size);
- old_start = malloc(old_size);
- remembered_start =
- (value **) malloc(remembered_size * sizeof(value *));
- if (young_start == NULL ||
- old_start == NULL ||
- remembered_start == NULL) {
- fprintf(stderr, "Cannot allocate initial heap\n");
- exit(2);
- }
- young_end = young_start + young_size;
- young_ptr = young_end;
- old_end = old_start + old_size;
- old_ptr = old_start;
- remembered_end = remembered_start + remembered_size;
- remembered_ptr = remembered_start;
-}
-
-/* The hashtable of frame descriptors */
-
-typedef struct {
- unsigned long retaddr;
- short frame_size;
- short num_live;
- short live_ofs[1];
-} frame_descr;
-
-static frame_descr ** frame_descriptors = NULL;
-static int frame_descriptors_mask;
-
-#define Hash_retaddr(addr) \
- (((unsigned long)(addr) >> 2) & frame_descriptors_mask)
-
-extern long * caml_frametable[];
-
-static void init_frame_descriptors()
-{
- long num_descr, tblsize, i, j, len;
- long * tbl;
- frame_descr * d;
- unsigned long h;
-
- /* Count the frame descriptors */
- num_descr = 0;
- for (i = 0; caml_frametable[i] != 0; i++)
- num_descr += *(caml_frametable[i]);
-
- /* The size of the hashtable is a power of 2 greater or equal to
- 4 times the number of descriptors */
- tblsize = 4;
- while (tblsize < 4 * num_descr) tblsize *= 2;
-
- /* Allocate the hash table */
- frame_descriptors =
- (frame_descr **) malloc(tblsize * sizeof(frame_descr *));
- for (i = 0; i < tblsize; i++) frame_descriptors[i] = NULL;
- frame_descriptors_mask = tblsize - 1;
-
- /* Fill the hash table */
- for (i = 0; caml_frametable[i] != 0; i++) {
- tbl = caml_frametable[i];
- len = *tbl;
- d = (frame_descr *)(tbl + 1);
- for (j = 0; j < len; j++) {
- h = Hash_retaddr(d->retaddr);
- while (frame_descriptors[h] != NULL) {
- h = (h+1) & frame_descriptors_mask;
- }
- frame_descriptors[h] = d;
- d = (frame_descr *)
- (((unsigned long)d +
- sizeof(char *) + sizeof(short) + sizeof(short) +
- sizeof(short) * d->num_live + sizeof(frame_descr *) - 1)
- & -sizeof(frame_descr *));
- }
- }
-}
-
-/* Copy an object (but not its descendents) and overwrite it with
- its new location */
-
-#define Forward_mask 0x100
-
-#if defined(__GNUC__) && !defined(DEBUG)
-static inline
-#else
-static
-#endif
-void copy_obj(addr)
- value * addr;
-{
- value v, res;
- header_t hdr, size, ofs, i;
-
- v = *addr;
- if (Is_int(v) || (char *) v <= young_start || (char *) v > young_end)
- return;
- hdr = Header_val(v);
- if (hdr & Forward_mask) { /* Already copied? */
- res = Field(v, 0); /* Forwarding pointer is in field 0 */
- } else if (Tag_header(hdr) != Infix_tag) {
- size = Size_header(hdr);
- res = (value) (old_ptr + sizeof(header_t));
- old_ptr += sizeof(header_t) + size * sizeof(value);
- Header_val(res) = hdr & ~Modified_mask;
- for (i = 0; i < size; i++)
- Field(res, i) = Field(v, i);
- Header_val(v) = hdr | Forward_mask; /* Set forward mark */
- Field(v, 0) = res; /* Store forwarding pointer */
- } else {
- ofs = Size_header(hdr) * sizeof(value);
- v -= ofs;
- hdr = Header_val(v);
- if (hdr & Forward_mask) {
- res = Field(v, 0);
- } else {
- size = Size_header(hdr);
- res = (value) (old_ptr + sizeof(header_t));
- Header_val(res) = hdr & ~Modified_mask;
- old_ptr += sizeof(header_t) + size * sizeof(value);
- for (i = 0; i < size; i++)
- Field(res, i) = Field(v, i);
- Header_val(v) = hdr | Forward_mask;
- Field(v, 0) = res;
- }
- res += ofs;
- }
- *addr = res;
-}
-
-/* Machine-dependent stack frame accesses */
-
-#ifdef alpha
-#define Saved_return_address(sp) *((long *)(sp - 8))
-#define Already_scanned(sp, retaddr) (retaddr & 1)
-#define Mark_scanned(sp, retaddr) (*((long *)(sp - 8)) = retaddr | 1)
-/** #define Already_scanned(sp, retaddr) 0 **/
-/** #define Mark_scanned(sp, retaddr) **/
-#endif
-
-extern value * caml_globals[];
-extern char * caml_bottom_of_stack, * caml_top_of_stack;
-extern unsigned long caml_last_return_address;
-extern value gc_entry_regs[];
-
-/* Copy everything in the minor heap */
-
-static void minor_collection()
-{
- char * scan_ptr, * sp;
- unsigned long retaddr;
- frame_descr * d;
- unsigned long h;
- int i, n, ofs;
- short * p;
- value v;
- header_t hdr, size;
- value * root, ** rem;
-
- scan_ptr = old_ptr;
-
- /* Copy the global values */
- for (i = 0; caml_globals[i] != 0; i++) copy_obj(caml_globals[i]);
-
- /* Stack roots */
- if (frame_descriptors == NULL) init_frame_descriptors();
- sp = caml_bottom_of_stack;
- retaddr = caml_last_return_address;
-
- while (sp < caml_top_of_stack) {
- /* Find the descriptor corresponding to the return address */
- h = Hash_retaddr(retaddr);
- while(1) {
- d = frame_descriptors[h];
- if (d->retaddr == retaddr) break;
- h = (h+1) & frame_descriptors_mask;
- }
- /* Scan the roots in this frame */
- for (p = d->live_ofs, n = d->num_live; n > 0; n--, p++) {
- ofs = *p;
- if (ofs >= 0) {
- Assert(ofs < d->frame_size);
- root = (value *)(sp + ofs);
- } else {
- Assert(ofs >= -32);
- root = &gc_entry_regs[-ofs-1];
- }
- copy_obj(root);
- }
- /* Move to next frame */
- sp += d->frame_size;
- retaddr = Saved_return_address(sp);
- /* Stop here if already scanned */
- if (Already_scanned(sp, retaddr)) break;
- /* Mark frame as already scanned */
- Mark_scanned(sp, retaddr);
- }
-
- /* Scan the remembered set */
- for (rem = remembered_start; rem < remembered_ptr; rem++) {
- v = **rem;
- hdr = Header_val(v);
- if (hdr < No_scan_tag) {
- size = Size_header(hdr);
- for (i = 0; i < size; i++) copy_obj(&Field(v, i));
- }
- Header_val(v) &= ~Modified_mask;
- }
-
- /* Finish the copying */
-
- while (scan_ptr < old_ptr) {
- v = (value) (scan_ptr + sizeof(header_t));
- hdr = Header_val(v);
- size = Size_header(hdr);
- if (Tag_header(hdr) < No_scan_tag) {
- for (i = 0; i < size; i++) copy_obj(&Field(v, i));
- }
- scan_ptr += sizeof(header_t) + size * sizeof(value);
- }
-
- /* Reset allocation pointers */
- young_ptr = young_end;
- remembered_ptr = remembered_start;
-}
-
-/* Garbage collection */
-
-void garbage_collection(request)
- unsigned long request;
-{
- char * initial_old_ptr;
-
- fprintf(stderr, "<"); fflush(stderr);
-#ifdef DEBUG
- Assert(young_ptr <= young_end);
- Assert(young_ptr < young_start);
- Assert(young_ptr + request >= young_start);
- check_globals();
- check_heap(young_ptr + request, young_end);
- check_heap(old_start, old_ptr);
-#endif
- if (old_end - old_ptr < young_size) {
- fprintf(stderr, "reallocating old generation "); fflush(stderr);
- old_start = malloc(old_size);
- if (old_start == NULL) {
- fprintf(stderr, "Cannot extend heap\n");
- exit(2);
- }
- old_end = old_start + old_size;
- old_ptr = old_start;
- }
- initial_old_ptr = old_ptr;
- minor_collection();
-#ifdef DEBUG
- check_globals();
- check_heap(old_start, old_ptr);
-#endif
- young_ptr -= request;
- fprintf(stderr, "%d%%>", ((old_ptr - initial_old_ptr) * 100) / young_size);
- fflush(stderr);
-}
-
-/* Reallocate remembered set */
-
-void realloc_remembered()
-{
- int used = remembered_ptr - remembered_start;
- remembered_size *= 2;
- remembered_start =
- (value **) realloc(remembered_start, remembered_size);
- if (remembered_start == NULL) {
- fprintf(stderr, "Cannot reallocate remembered set\n");
- exit(2);
- }
- remembered_end = remembered_start + remembered_size;
- remembered_ptr = remembered_start + used;
-}
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