1 /* Simple garbage collection for the GNU compiler.
2 Copyright (C) 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 GNU CC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 /* Generic garbage collection (GC) functions and data, not specific to
22 any particular GC implementation. */
33 /* Statistics about the allocation. */
34 static ggc_statistics *ggc_stats;
36 /* Trees that have been marked, but whose children still need marking. */
37 varray_type ggc_pending_trees;
39 static void ggc_mark_rtx_ptr PARAMS ((void *));
40 static void ggc_mark_tree_ptr PARAMS ((void *));
41 static void ggc_mark_rtx_varray_ptr PARAMS ((void *));
42 static void ggc_mark_tree_varray_ptr PARAMS ((void *));
43 static void ggc_mark_tree_hash_table_ptr PARAMS ((void *));
44 static void ggc_mark_string_ptr PARAMS ((void *));
45 static void ggc_mark_trees PARAMS ((void));
46 static boolean ggc_mark_tree_hash_table_entry PARAMS ((struct hash_entry *,
49 /* Maintain global roots that are preserved during GC. */
51 /* Global roots that are preserved during calls to gc. */
55 struct ggc_root *next;
59 void (*cb) PARAMS ((void *));
62 static struct ggc_root *roots;
64 /* Add BASE as a new garbage collection root. It is an array of
65 length NELT with each element SIZE bytes long. CB is a
66 function that will be called with a pointer to each element
67 of the array; it is the intention that CB call the appropriate
68 routine to mark gc-able memory for that element. */
71 ggc_add_root (base, nelt, size, cb)
74 void (*cb) PARAMS ((void *));
76 struct ggc_root *x = (struct ggc_root *) xmalloc (sizeof (*x));
87 /* Register an array of rtx as a GC root. */
90 ggc_add_rtx_root (base, nelt)
94 ggc_add_root (base, nelt, sizeof(rtx), ggc_mark_rtx_ptr);
97 /* Register an array of trees as a GC root. */
100 ggc_add_tree_root (base, nelt)
104 ggc_add_root (base, nelt, sizeof(tree), ggc_mark_tree_ptr);
107 /* Register a varray of rtxs as a GC root. */
110 ggc_add_rtx_varray_root (base, nelt)
114 ggc_add_root (base, nelt, sizeof (varray_type),
115 ggc_mark_rtx_varray_ptr);
118 /* Register a varray of trees as a GC root. */
121 ggc_add_tree_varray_root (base, nelt)
125 ggc_add_root (base, nelt, sizeof (varray_type),
126 ggc_mark_tree_varray_ptr);
129 /* Register a hash table of trees as a GC root. */
132 ggc_add_tree_hash_table_root (base, nelt)
133 struct hash_table **base;
136 ggc_add_root (base, nelt, sizeof (struct hash_table *),
137 ggc_mark_tree_hash_table_ptr);
140 /* Register an array of strings as a GC root. */
143 ggc_add_string_root (base, nelt)
147 ggc_add_root (base, nelt, sizeof (char *), ggc_mark_string_ptr);
150 /* Remove the previously registered GC root at BASE. */
156 struct ggc_root *x, **p;
158 p = &roots, x = roots;
174 /* Iterate through all registered roots and mark each element. */
181 VARRAY_TREE_INIT (ggc_pending_trees, 4096, "ggc_pending_trees");
183 for (x = roots; x != NULL; x = x->next)
186 int s = x->size, n = x->nelt;
187 void (*cb) PARAMS ((void *)) = x->cb;
190 for (i = 0; i < n; ++i, elt += s)
194 /* Mark all the queued up trees, and their children. */
196 VARRAY_FREE (ggc_pending_trees);
199 /* R had not been previously marked, but has now been marked via
200 ggc_set_mark. Now recurse and process the children. */
203 ggc_mark_rtx_children (r)
212 enum rtx_code code = GET_CODE (r);
213 /* This gets set to a child rtx to eliminate tail recursion. */
216 /* Collect statistics, if appropriate. */
219 ++ggc_stats->num_rtxs[(int) code];
220 ggc_stats->size_rtxs[(int) code] += ggc_get_size (r);
223 /* ??? If (some of) these are really pass-dependant info, do we
224 have any right poking our noses in? */
228 ggc_mark_rtx (JUMP_LABEL (r));
231 ggc_mark_rtx (LABEL_REFS (r));
232 ggc_mark_string (LABEL_ALTERNATE_NAME (r));
235 ggc_mark_rtx (LABEL_NEXTREF (r));
236 ggc_mark_rtx (CONTAINING_INSN (r));
239 ggc_mark_tree (ADDRESSOF_DECL (r));
242 ggc_mark_rtx (CONST_DOUBLE_CHAIN (r));
245 switch (NOTE_LINE_NUMBER (r))
247 case NOTE_INSN_RANGE_START:
248 case NOTE_INSN_RANGE_END:
250 ggc_mark_rtx (NOTE_RANGE_INFO (r));
253 case NOTE_INSN_BLOCK_BEG:
254 case NOTE_INSN_BLOCK_END:
255 ggc_mark_tree (NOTE_BLOCK (r));
259 if (NOTE_LINE_NUMBER (r) >= 0)
260 ggc_mark_string (NOTE_SOURCE_FILE (r));
269 for (fmt = GET_RTX_FORMAT (GET_CODE (r)), i = 0; *fmt ; ++fmt, ++i)
276 if (ggc_test_and_set_mark (exp))
278 if (next_rtx == NULL)
281 ggc_mark_rtx_children (exp);
285 ggc_mark_rtvec (XVEC (r, i));
288 ggc_mark_if_gcable (XSTR (r, i));
293 while ((r = next_rtx) != NULL);
296 /* V had not been previously marked, but has now been marked via
297 ggc_set_mark. Now recurse and process the children. */
300 ggc_mark_rtvec_children (v)
305 i = GET_NUM_ELEM (v);
307 ggc_mark_rtx (RTVEC_ELT (v, i));
310 /* Recursively set marks on all of the children of the
311 GCC_PENDING_TREES. */
316 while (ggc_pending_trees->elements_used)
321 t = VARRAY_TOP_TREE (ggc_pending_trees);
322 VARRAY_POP (ggc_pending_trees);
323 code = TREE_CODE (t);
325 /* Collect statistics, if appropriate. */
328 ++ggc_stats->num_trees[(int) code];
329 ggc_stats->size_trees[(int) code] += ggc_get_size (t);
332 /* Bits from common. */
333 ggc_mark_tree (TREE_TYPE (t));
334 ggc_mark_tree (TREE_CHAIN (t));
336 /* Some nodes require special handling. */
340 ggc_mark_tree (TREE_PURPOSE (t));
341 ggc_mark_tree (TREE_VALUE (t));
346 int i = TREE_VEC_LENGTH (t);
348 ggc_mark_tree (TREE_VEC_ELT (t, i));
353 ggc_mark_tree (TREE_OPERAND (t, 0));
354 ggc_mark_tree (SAVE_EXPR_CONTEXT (t));
355 ggc_mark_rtx (SAVE_EXPR_RTL (t));
359 ggc_mark_rtx (RTL_EXPR_SEQUENCE (t));
360 ggc_mark_rtx (RTL_EXPR_RTL (t));
364 ggc_mark_tree (TREE_OPERAND (t, 0));
365 ggc_mark_tree (TREE_OPERAND (t, 1));
366 ggc_mark_rtx (CALL_EXPR_RTL (t));
370 ggc_mark_tree (TREE_REALPART (t));
371 ggc_mark_tree (TREE_IMAGPART (t));
375 ggc_mark_string (TREE_STRING_POINTER (t));
379 ggc_mark_rtx (DECL_INCOMING_RTL (t));
383 ggc_mark_tree (DECL_FIELD_BIT_OFFSET (t));
386 case IDENTIFIER_NODE:
387 ggc_mark_string (IDENTIFIER_POINTER (t));
395 /* But in general we can handle them by class. */
396 switch (TREE_CODE_CLASS (code))
398 case 'd': /* A decl node. */
399 ggc_mark_string (DECL_SOURCE_FILE (t));
400 ggc_mark_tree (DECL_SIZE (t));
401 ggc_mark_tree (DECL_SIZE_UNIT (t));
402 ggc_mark_tree (DECL_NAME (t));
403 ggc_mark_tree (DECL_CONTEXT (t));
404 ggc_mark_tree (DECL_ARGUMENTS (t));
405 ggc_mark_tree (DECL_RESULT_FLD (t));
406 ggc_mark_tree (DECL_INITIAL (t));
407 ggc_mark_tree (DECL_ABSTRACT_ORIGIN (t));
408 ggc_mark_tree (DECL_ASSEMBLER_NAME (t));
409 ggc_mark_tree (DECL_SECTION_NAME (t));
410 ggc_mark_tree (DECL_MACHINE_ATTRIBUTES (t));
411 ggc_mark_rtx (DECL_RTL (t));
412 ggc_mark_rtx (DECL_LIVE_RANGE_RTL (t));
413 ggc_mark_tree (DECL_VINDEX (t));
417 case 't': /* A type node. */
418 ggc_mark_tree (TYPE_SIZE (t));
419 ggc_mark_tree (TYPE_SIZE_UNIT (t));
420 ggc_mark_tree (TYPE_ATTRIBUTES (t));
421 ggc_mark_tree (TYPE_VALUES (t));
422 ggc_mark_tree (TYPE_POINTER_TO (t));
423 ggc_mark_tree (TYPE_REFERENCE_TO (t));
424 ggc_mark_tree (TYPE_NAME (t));
425 ggc_mark_tree (TYPE_MIN_VALUE (t));
426 ggc_mark_tree (TYPE_MAX_VALUE (t));
427 ggc_mark_tree (TYPE_NEXT_VARIANT (t));
428 ggc_mark_tree (TYPE_MAIN_VARIANT (t));
429 ggc_mark_tree (TYPE_BINFO (t));
430 ggc_mark_tree (TYPE_NONCOPIED_PARTS (t));
431 ggc_mark_tree (TYPE_CONTEXT (t));
435 case 'b': /* A lexical block. */
436 ggc_mark_tree (BLOCK_VARS (t));
437 ggc_mark_tree (BLOCK_SUBBLOCKS (t));
438 ggc_mark_tree (BLOCK_SUPERCONTEXT (t));
439 ggc_mark_tree (BLOCK_ABSTRACT_ORIGIN (t));
442 case 'c': /* A constant. */
443 ggc_mark_rtx (TREE_CST_RTL (t));
446 case 'r': case '<': case '1':
447 case '2': case 'e': case 's': /* Expressions. */
449 int i = tree_code_length[TREE_CODE (t)];
451 ggc_mark_tree (TREE_OPERAND (t, i));
462 /* Mark all the elements of the varray V, which contains rtxs. */
465 ggc_mark_rtx_varray (v)
471 for (i = v->num_elements - 1; i >= 0; --i)
472 ggc_mark_rtx (VARRAY_RTX (v, i));
475 /* Mark all the elements of the varray V, which contains trees. */
478 ggc_mark_tree_varray (v)
484 for (i = v->num_elements - 1; i >= 0; --i)
485 ggc_mark_tree (VARRAY_TREE (v, i));
488 /* Mark the hash table-entry HE. It's key field is really a tree. */
491 ggc_mark_tree_hash_table_entry (he, k)
492 struct hash_entry *he;
493 hash_table_key k ATTRIBUTE_UNUSED;
495 ggc_mark_tree ((tree) he->key);
499 /* Mark all the elements of the hash-table H, which contains trees. */
502 ggc_mark_tree_hash_table (ht)
503 struct hash_table *ht;
505 hash_traverse (ht, ggc_mark_tree_hash_table_entry, /*info=*/0);
508 /* Type-correct function to pass to ggc_add_root. It just forwards
509 *ELT (which is an rtx) to ggc_mark_rtx. */
512 ggc_mark_rtx_ptr (elt)
515 ggc_mark_rtx (*(rtx *) elt);
518 /* Type-correct function to pass to ggc_add_root. It just forwards
519 *ELT (which is a tree) to ggc_mark_tree. */
522 ggc_mark_tree_ptr (elt)
525 ggc_mark_tree (*(tree *) elt);
528 /* Type-correct function to pass to ggc_add_root. It just forwards
529 ELT (which is really a varray_type *) to ggc_mark_rtx_varray. */
532 ggc_mark_rtx_varray_ptr (elt)
535 ggc_mark_rtx_varray (*(varray_type *) elt);
538 /* Type-correct function to pass to ggc_add_root. It just forwards
539 ELT (which is really a varray_type *) to ggc_mark_tree_varray. */
542 ggc_mark_tree_varray_ptr (elt)
545 ggc_mark_tree_varray (*(varray_type *) elt);
548 /* Type-correct function to pass to ggc_add_root. It just forwards
549 ELT (which is really a struct hash_table **) to
550 ggc_mark_tree_hash_table. */
553 ggc_mark_tree_hash_table_ptr (elt)
556 ggc_mark_tree_hash_table (*(struct hash_table **) elt);
559 /* Type-correct function to pass to ggc_add_root. It just forwards
560 ELT (which is really a char **) to ggc_mark_string. */
563 ggc_mark_string_ptr (elt)
566 ggc_mark_string (*(char **) elt);
569 /* Allocate a gc-able string. If CONTENTS is null, then the memory will
570 be uninitialized. If LENGTH is -1, then CONTENTS is assumed to be a
571 null-terminated string and the memory sized accordingly. Otherwise,
572 the memory is filled with LENGTH bytes from CONTENTS. */
575 ggc_alloc_string (contents, length)
576 const char *contents;
583 if (contents == NULL)
585 length = strlen (contents);
588 string = (char *) ggc_alloc_obj (length + 1, 0);
589 if (contents != NULL)
590 memcpy (string, contents, length);
596 /* Print statistics that are independent of the collector in use. */
599 ggc_print_statistics (stream, stats)
601 ggc_statistics *stats;
605 /* Set the pointer so that during collection we will actually gather
609 /* Then do one collection to fill in the statistics. */
612 /* Total the statistics. */
613 for (code = 0; code < MAX_TREE_CODES; ++code)
615 stats->total_num_trees += stats->num_trees[code];
616 stats->total_size_trees += stats->size_trees[code];
618 for (code = 0; code < NUM_RTX_CODE; ++code)
620 stats->total_num_rtxs += stats->num_rtxs[code];
621 stats->total_size_rtxs += stats->size_rtxs[code];
624 /* Print the statistics for trees. */
625 fprintf (stream, "%-22s%-16s%-16s%-7s\n", "Code",
626 "Number", "Bytes", "% Total");
627 for (code = 0; code < MAX_TREE_CODES; ++code)
628 if (ggc_stats->num_trees[code])
630 fprintf (stream, "%s%*s%-15u %-15lu %7.3f\n",
631 tree_code_name[code],
632 22 - (int) strlen (tree_code_name[code]), "",
633 ggc_stats->num_trees[code],
634 (unsigned long) ggc_stats->size_trees[code],
635 (100 * ((double) ggc_stats->size_trees[code])
636 / ggc_stats->total_size_trees));
639 "%-22s%-15u %-15lu\n", "Total",
640 ggc_stats->total_num_trees,
641 (unsigned long) ggc_stats->total_size_trees);
643 /* Print the statistics for RTL. */
644 fprintf (stream, "\n%-22s%-16s%-16s%-7s\n", "Code",
645 "Number", "Bytes", "% Total");
646 for (code = 0; code < NUM_RTX_CODE; ++code)
647 if (ggc_stats->num_rtxs[code])
649 fprintf (stream, "%s%*s%-15u %-15lu %7.3f\n",
651 22 - (int) strlen (rtx_name[code]), "",
652 ggc_stats->num_rtxs[code],
653 (unsigned long) ggc_stats->size_rtxs[code],
654 (100 * ((double) ggc_stats->size_rtxs[code])
655 / ggc_stats->total_size_rtxs));
658 "%-22s%-15u %-15lu\n", "Total",
659 ggc_stats->total_num_rtxs,
660 (unsigned long) ggc_stats->total_size_rtxs);
663 /* Don't gather statistics any more. */