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C/C++ Source or Header  |  2001-01-01  |  10.8 KB  |  361 lines
  1. /* Copyright (C) 1999 Aladdin Enterprises.  All rights reserved.
  2.   
  3.   This file is part of AFPL Ghostscript.
  4.   
  5.   AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  6.   distributor accepts any responsibility for the consequences of using it, or
  7.   for whether it serves any particular purpose or works at all, unless he or
  8.   she says so in writing.  Refer to the Aladdin Free Public License (the
  9.   "License") for full details.
  10.   
  11.   Every copy of AFPL Ghostscript must include a copy of the License, normally
  12.   in a plain ASCII text file named PUBLIC.  The License grants you the right
  13.   to copy, modify and redistribute AFPL Ghostscript, but only under certain
  14.   conditions described in the License.  Among other things, the License
  15.   requires that the copyright notice and this notice be preserved on all
  16.   copies.
  17. */
  18.  
  19. /*$Id: gsmemret.c,v 1.2 2000/09/19 19:00:30 lpd Exp $ */
  20. /* Retrying memory allocator */
  21.  
  22. #include "gx.h"
  23. #include "gsmemret.h"
  24. #include "gserrors.h"
  25.  
  26. /* Raw memory procedures */
  27. private gs_memory_proc_alloc_bytes(gs_retrying_alloc_bytes_immovable);
  28. private gs_memory_proc_resize_object(gs_retrying_resize_object);
  29. private gs_memory_proc_free_object(gs_forward_free_object);
  30. private gs_memory_proc_stable(gs_retrying_stable);
  31. private gs_memory_proc_status(gs_forward_status);
  32. private gs_memory_proc_free_all(gs_forward_free_all);
  33. private gs_memory_proc_consolidate_free(gs_forward_consolidate_free);
  34.  
  35. /* Object memory procedures */
  36. private gs_memory_proc_alloc_bytes(gs_retrying_alloc_bytes);
  37. private gs_memory_proc_alloc_struct(gs_retrying_alloc_struct);
  38. private gs_memory_proc_alloc_struct(gs_retrying_alloc_struct_immovable);
  39. private gs_memory_proc_alloc_byte_array(gs_retrying_alloc_byte_array);
  40. private gs_memory_proc_alloc_byte_array(gs_retrying_alloc_byte_array_immovable);
  41. private gs_memory_proc_alloc_struct_array(gs_retrying_alloc_struct_array);
  42. private gs_memory_proc_alloc_struct_array(gs_retrying_alloc_struct_array_immovable);
  43. private gs_memory_proc_object_size(gs_forward_object_size);
  44. private gs_memory_proc_object_type(gs_forward_object_type);
  45. private gs_memory_proc_alloc_string(gs_retrying_alloc_string);
  46. private gs_memory_proc_alloc_string(gs_retrying_alloc_string_immovable);
  47. private gs_memory_proc_resize_string(gs_retrying_resize_string);
  48. private gs_memory_proc_free_string(gs_forward_free_string);
  49. private gs_memory_proc_register_root(gs_retrying_register_root);
  50. private gs_memory_proc_unregister_root(gs_forward_unregister_root);
  51. private gs_memory_proc_enable_free(gs_forward_enable_free);
  52. private const gs_memory_procs_t retrying_procs = {
  53.     /* Raw memory procedures */
  54.     gs_retrying_alloc_bytes_immovable,
  55.     gs_retrying_resize_object,
  56.     gs_forward_free_object,
  57.     gs_retrying_stable,
  58.     gs_forward_status,
  59.     gs_forward_free_all,
  60.     gs_forward_consolidate_free,
  61.     /* Object memory procedures */
  62.     gs_retrying_alloc_bytes,
  63.     gs_retrying_alloc_struct,
  64.     gs_retrying_alloc_struct_immovable,
  65.     gs_retrying_alloc_byte_array,
  66.     gs_retrying_alloc_byte_array_immovable,
  67.     gs_retrying_alloc_struct_array,
  68.     gs_retrying_alloc_struct_array_immovable,
  69.     gs_forward_object_size,
  70.     gs_forward_object_type,
  71.     gs_retrying_alloc_string,
  72.     gs_retrying_alloc_string_immovable,
  73.     gs_retrying_resize_string,
  74.     gs_forward_free_string,
  75.     gs_retrying_register_root,
  76.     gs_forward_unregister_root,
  77.     gs_forward_enable_free
  78. };
  79.  
  80. /* Define a vacuous recovery procedure. */
  81. private gs_memory_recover_status_t
  82. no_recover_proc(gs_memory_retrying_t *rmem, void *proc_data)
  83. {
  84.     return RECOVER_STATUS_NO_RETRY;
  85. }
  86.  
  87. /* ---------- Public constructors/destructors ---------- */
  88.  
  89. /* Initialize a gs_memory_retrying_t */
  90. int                /* -ve error code or 0 */
  91. gs_memory_retrying_init(
  92.               gs_memory_retrying_t * rmem,    /* allocator to init */
  93.               gs_memory_t * target    /* allocator to wrap */
  94. )
  95. {
  96.     rmem->stable_memory = 0;
  97.     rmem->procs = retrying_procs;
  98.     rmem->target = target;
  99.     gs_memory_retrying_set_recover(rmem, no_recover_proc, NULL);
  100.     return 0;
  101. }
  102.  
  103. /* Set the recovery closure of a retrying memory manager. */
  104. void
  105. gs_memory_retrying_set_recover(gs_memory_retrying_t *rmem,
  106.                    gs_memory_recover_proc_t recover_proc,
  107.                    void *recover_proc_data)
  108. {
  109.     rmem->recover_proc = recover_proc;
  110.     rmem->recover_proc_data = recover_proc_data;
  111. }
  112.  
  113. /* Release a retrying memory manager. */
  114. /* Note that this has no effect on the target. */
  115. void
  116. gs_memory_retrying_release(gs_memory_retrying_t *rmem)
  117. {
  118.     gs_memory_free_all((gs_memory_t *)rmem, FREE_ALL_STRUCTURES,
  119.                "gs_memory_retrying_release");
  120. }
  121.  
  122. /* ---------- Accessors ------------- */
  123.  
  124. /* Retrieve this allocator's target */
  125. gs_memory_t *
  126. gs_memory_retrying_target(const gs_memory_retrying_t *rmem)
  127. {
  128.     return rmem->target;
  129. }
  130.  
  131. /* -------- Private members just wrap retrying around a gs_memory --- */
  132.  
  133. /*
  134.  * Contrary to our usual practice, we don't use BEGIN/END here, because
  135.  * that causes some compilers to give bogus error messages.
  136.  */
  137.  
  138. #define DO_FORWARD(call_target)\
  139.     gs_memory_retrying_t * const rmem = (gs_memory_retrying_t *)mem;\
  140.     gs_memory_t *const target = rmem->target;\
  141. \
  142.     call_target
  143.  
  144. #define RETURN_RETRYING(result_type, call_target)\
  145.     gs_memory_retrying_t * const rmem = (gs_memory_retrying_t *)mem;\
  146.     gs_memory_t *const target = rmem->target;\
  147.     result_type temp;\
  148.     gs_memory_recover_status_t retry = RECOVER_STATUS_RETRY_OK;\
  149. \
  150.     for (;;) {\
  151.         temp = call_target;\
  152.         if (temp != 0 || retry != RECOVER_STATUS_RETRY_OK)\
  153.         break;\
  154.         retry = rmem->recover_proc(rmem, rmem->recover_proc_data);\
  155.     }\
  156.     return temp
  157.  
  158. /* Procedures */
  159. private void
  160. gs_forward_free_all(gs_memory_t * mem, uint free_mask, client_name_t cname)
  161. {
  162.     gs_memory_retrying_t * const rmem = (gs_memory_retrying_t *)mem;
  163.     gs_memory_t * const target = rmem->target;
  164.  
  165.     /* Only free the structures and the allocator itself. */
  166.     rmem->target = 0;
  167.     if (free_mask & FREE_ALL_ALLOCATOR)
  168.     gs_free_object(target, rmem, cname);
  169. }
  170. private void
  171. gs_forward_consolidate_free(gs_memory_t * mem)
  172. {
  173.     DO_FORWARD(target->procs.consolidate_free(target));
  174. }
  175. private byte *
  176. gs_retrying_alloc_bytes(gs_memory_t * mem, uint size, client_name_t cname)
  177. {
  178.     RETURN_RETRYING(
  179.             byte *,
  180.             target->procs.alloc_bytes(target, size, cname)
  181.             );
  182. }
  183. private byte *
  184. gs_retrying_alloc_bytes_immovable(gs_memory_t * mem, uint size,
  185.                 client_name_t cname)
  186. {
  187.     RETURN_RETRYING(
  188.             byte *,
  189.             target->procs.alloc_bytes_immovable(target, size, cname)
  190.             );
  191. }
  192. private void *
  193. gs_retrying_alloc_struct(gs_memory_t * mem, gs_memory_type_ptr_t pstype,
  194.                client_name_t cname)
  195. {
  196.     RETURN_RETRYING(
  197.             void *,
  198.             target->procs.alloc_struct(target, pstype, cname)
  199.             );
  200. }
  201. private void *
  202. gs_retrying_alloc_struct_immovable(gs_memory_t * mem,
  203.                gs_memory_type_ptr_t pstype, client_name_t cname)
  204. {
  205.     RETURN_RETRYING(
  206.             void *,
  207.             target->procs.alloc_struct_immovable(target, pstype, cname)
  208.             );
  209. }
  210. private byte *
  211. gs_retrying_alloc_byte_array(gs_memory_t * mem, uint num_elements, uint elt_size,
  212.                client_name_t cname)
  213. {
  214.     RETURN_RETRYING(
  215.             byte *,
  216.             target->procs.alloc_byte_array(target, num_elements,
  217.                            elt_size, cname)
  218.             );
  219. }
  220. private byte *
  221. gs_retrying_alloc_byte_array_immovable(gs_memory_t * mem, uint num_elements,
  222.                      uint elt_size, client_name_t cname)
  223. {
  224.     RETURN_RETRYING(
  225.             byte *,
  226.             target->procs.alloc_byte_array_immovable(target,
  227.                             num_elements, elt_size,
  228.                             cname)
  229.             );
  230. }
  231. private void *
  232. gs_retrying_alloc_struct_array(gs_memory_t * mem, uint num_elements,
  233.                gs_memory_type_ptr_t pstype, client_name_t cname)
  234. {
  235.     RETURN_RETRYING(
  236.             void *,
  237.             target->procs.alloc_struct_array(target, num_elements,
  238.                              pstype, cname)
  239.             );
  240. }
  241. private void *
  242. gs_retrying_alloc_struct_array_immovable(gs_memory_t * mem, uint num_elements,
  243.                gs_memory_type_ptr_t pstype, client_name_t cname)
  244. {
  245.     RETURN_RETRYING(
  246.             void *,
  247.             target->procs.alloc_struct_array_immovable(target,
  248.                             num_elements, pstype,
  249.                                 cname)
  250.             );
  251. }
  252. private void *
  253. gs_retrying_resize_object(gs_memory_t * mem, void *obj, uint new_num_elements,
  254.             client_name_t cname)
  255. {
  256.     RETURN_RETRYING(
  257.             void *,
  258.             target->procs.resize_object(target, obj, new_num_elements,
  259.                         cname)
  260.             );
  261. }
  262. private uint
  263. gs_forward_object_size(gs_memory_t * mem, const void *ptr)
  264. {
  265.     DO_FORWARD(return target->procs.object_size(target, ptr));
  266. }
  267. private gs_memory_type_ptr_t
  268. gs_forward_object_type(gs_memory_t * mem, const void *ptr)
  269. {
  270.     DO_FORWARD(return target->procs.object_type(target, ptr));
  271. }
  272. private void
  273. gs_forward_free_object(gs_memory_t * mem, void *ptr, client_name_t cname)
  274. {
  275.     DO_FORWARD(target->procs.free_object(target, ptr, cname));
  276. }
  277. private byte *
  278. gs_retrying_alloc_string(gs_memory_t * mem, uint nbytes, client_name_t cname)
  279. {
  280.     RETURN_RETRYING(
  281.             byte *,
  282.             target->procs.alloc_string(target, nbytes, cname)
  283.             );
  284. }
  285. private byte *
  286. gs_retrying_alloc_string_immovable(gs_memory_t * mem, uint nbytes,
  287.                  client_name_t cname)
  288. {
  289.     RETURN_RETRYING(
  290.             byte *,
  291.             target->procs.alloc_string_immovable(target, nbytes, cname)
  292.             );
  293. }
  294. private byte *
  295. gs_retrying_resize_string(gs_memory_t * mem, byte * data, uint old_num,
  296.             uint new_num,
  297.             client_name_t cname)
  298. {
  299.     RETURN_RETRYING(
  300.             byte *,
  301.             target->procs.resize_string(target, data, old_num, new_num,
  302.                         cname)
  303.             );
  304. }
  305. private void
  306. gs_forward_free_string(gs_memory_t * mem, byte * data, uint nbytes,
  307.               client_name_t cname)
  308. {
  309.     DO_FORWARD(target->procs.free_string(target, data, nbytes, cname));
  310. }
  311. private int
  312. gs_retrying_register_root(gs_memory_t * mem, gs_gc_root_t * rp,
  313.             gs_ptr_type_t ptype, void **up, client_name_t cname)
  314. {
  315.     RETURN_RETRYING(
  316.             int,
  317.             target->procs.register_root(target, rp, ptype, up, cname)
  318.             );
  319. }
  320. private void
  321. gs_forward_unregister_root(gs_memory_t * mem, gs_gc_root_t * rp,
  322.               client_name_t cname)
  323. {
  324.     DO_FORWARD(target->procs.unregister_root(target, rp, cname));
  325. }
  326. private gs_memory_t *
  327. gs_retrying_stable(gs_memory_t * mem)
  328. {
  329.     if (!mem->stable_memory) {
  330.     gs_memory_retrying_t * const rmem = (gs_memory_retrying_t *)mem;
  331.     gs_memory_t *stable = gs_memory_stable(rmem->target);
  332.  
  333.     if (stable == rmem->target)
  334.         mem->stable_memory = mem;
  335.     else {
  336.         gs_memory_retrying_t *retrying_stable = (gs_memory_retrying_t *)
  337.         gs_alloc_bytes(stable, sizeof(*rmem), "gs_retrying_stable");
  338.  
  339.         if (retrying_stable) {
  340.         int code = gs_memory_retrying_init(retrying_stable, stable);
  341.  
  342.         if (code < 0)
  343.             gs_free_object(stable, retrying_stable, "gs_retrying_stable");
  344.         else
  345.             mem->stable_memory = (gs_memory_t *)retrying_stable;
  346.         }
  347.     }
  348.     }
  349.     return mem->stable_memory;
  350. }
  351. private void
  352. gs_forward_status(gs_memory_t * mem, gs_memory_status_t * pstat)
  353. {
  354.     DO_FORWARD(target->procs.status(target, pstat));
  355. }
  356. private void
  357. gs_forward_enable_free(gs_memory_t * mem, bool enable)
  358. {
  359.     DO_FORWARD(target->procs.enable_free(target, enable));
  360. }
  361.