3 /* cbps - persistant states for callbacks */
5 /* Copyright (c) 2004 Olivier Aumage, Martin Quinson. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "gras/DataDesc/datadesc_private.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ddt_cbps,datadesc,"callback persistant state");
14 gras_datadesc_type_t type;
16 } s_gras_cbps_elm_t, *gras_cbps_elm_t;
18 typedef struct s_gras_cbps {
19 xbt_dynar_t lints; /* simple stack of long integers (easy interface) */
21 xbt_dict_t space; /* varname x dynar of gras_cbps_elm_t */
22 xbt_dynar_t frames; /* of dynar of names defined within this frame
23 (and to pop when we leave it) */
27 static void free_string(void *d);
29 static void free_string(void *d){
33 gras_cbps_t gras_cbps_new(void) {
36 res=xbt_new(s_gras_cbps_t,1);
38 res->lints = xbt_dynar_new(sizeof(int), NULL);
39 res->space = xbt_dict_new();
40 /* no leak, the content is freed manually on block_end */
41 res->frames = xbt_dynar_new(sizeof(xbt_dynar_t), NULL);
42 res->globals = xbt_dynar_new(sizeof(char*), NULL);
44 gras_cbps_block_begin(res);
49 void gras_cbps_free(gras_cbps_t *state) {
51 xbt_dynar_free( &( (*state)->lints ) );
53 gras_cbps_block_end(*state);
54 xbt_dict_free ( &( (*state)->space ) );
55 xbt_dynar_free( &( (*state)->frames ) );
56 xbt_dynar_free( &( (*state)->globals ) );
65 * Declare a new element in the PS, and give it a value. If an element of that
66 * name already exists, it is masked by the one given here, and will be
67 * seeable again only after a pop to remove the value this push adds.
70 gras_cbps_v_push(gras_cbps_t ps,
73 gras_datadesc_type_t ddt) {
75 xbt_dynar_t varstack,frame;
78 char *varname = (char*)strdup(name);
80 DEBUG2("push(%s,%p)",name,(void*)data);
81 errcode = xbt_dict_get(ps->space, name, (void **)&varstack);
83 if (errcode == mismatch_error) {
84 DEBUG1("Create a new variable stack for '%s' into the space",name);
85 varstack = xbt_dynar_new(sizeof (gras_cbps_elm_t *), NULL);
86 xbt_dict_set(ps->space, varname, (void **)varstack, NULL);
87 /* leaking, you think? only if you do not close all the openned blocks ;)*/
88 } else if (errcode != no_error) {
92 var = xbt_new0(s_gras_cbps_elm_t,1);
96 xbt_dynar_push(varstack, &var);
98 xbt_dynar_pop(ps->frames, &frame);
99 DEBUG4("Push %s (%p @%p) into frame %p",varname,(void*)varname,(void*)&varname,(void*)frame);
100 xbt_dynar_push(frame, &varname);
101 xbt_dynar_push(ps->frames, &frame);
108 * Retrieve an element from the PS, and remove it from the PS. If it's not
109 * present in the current block, it will fail (with abort) and not search
110 * in upper blocks since this denotes a programmation error.
113 gras_cbps_v_pop (gras_cbps_t ps,
115 gras_datadesc_type_t *ddt,
117 xbt_dynar_t varstack,frame;
118 gras_cbps_elm_t var = NULL;
122 DEBUG1("pop(%s)",name);
123 /* FIXME: Error handling */
124 errcode = xbt_dict_get(ps->space, name, (void **)&varstack);
125 if (errcode == mismatch_error) {
126 RAISE1(mismatch_error,"Asked to pop the non-existant %s",
129 xbt_dynar_pop(varstack, &var);
131 if (!xbt_dynar_length(varstack)) {
132 DEBUG1("Last incarnation of %s poped. Kill it",name);
133 xbt_dict_remove(ps->space, name);
134 xbt_dynar_free(&varstack);
143 xbt_dynar_pop(ps->frames, &frame);
145 int l = xbt_dynar_length(frame);
150 _name = xbt_dynar_get_as(frame, l, char*);
151 if (!strcmp(name, _name)) {
152 xbt_dynar_remove_at(frame, l, &_name);
158 xbt_dynar_push(ps->frames, &frame);
167 * Change the value of an element in the PS.
168 * If it's not present in the current block, look in the upper ones.
169 * If it's not present in any of them, modify in the globals
170 * If not present there neither, the code may segfault (Oli?).
172 * Once a reference to an element of that name is found somewhere in the PS,
173 * its value is changed.
176 gras_cbps_v_set (gras_cbps_t ps,
179 gras_datadesc_type_t ddt) {
181 xbt_dynar_t dynar = NULL;
182 gras_cbps_elm_t elm = NULL;
185 DEBUG1("set(%s)",name);
186 errcode = xbt_dict_get(ps->space, name, (void **)&dynar);
188 if (errcode == mismatch_error) {
189 dynar = xbt_dynar_new(sizeof (gras_cbps_elm_t), NULL);
190 xbt_dict_set(ps->space, name, (void **)dynar, NULL);
192 elm = xbt_new0(s_gras_cbps_elm_t,1);
193 xbt_dynar_push(ps->globals, &name);
195 xbt_dynar_pop(dynar, &elm);
201 xbt_dynar_push(dynar, &elm);
208 * Get the value of an element in the PS without modifying it.
209 * (note that you get the content of the data struct and not a copy to it)
210 * If it's not present in the current block, look in the upper ones.
211 * If it's not present in any of them, look in the globals
212 * If not present there neither, the code may segfault (Oli?).
215 gras_cbps_v_get (gras_cbps_t ps,
217 /* OUT */gras_datadesc_type_t *ddt) {
219 xbt_dynar_t dynar = NULL;
220 gras_cbps_elm_t elm = NULL;
222 DEBUG1("get(%s)",name);
223 /* FIXME: Error handling */
224 xbt_dict_get(ps->space, name, (void **)&dynar);
225 xbt_dynar_pop(dynar, &elm);
226 xbt_dynar_push(dynar, &elm);
237 * gras_cbps_block_begin:
239 * Begins a new block.
241 * Blocks are usefull to remove a whole set of declarations you don't even know
243 * E.g., they constitute an elegent solution to recursive data structures.
245 * push/pop may be used in some cases for that, but if your recursive data
246 * struct contains other structs needing themselves callbacks, you have to
247 * use block_{begin,end} to do the trick.
251 gras_cbps_block_begin(gras_cbps_t ps) {
253 xbt_dynar_t dynar = NULL;
255 DEBUG0(">>> Block begin");
256 dynar = xbt_dynar_new(sizeof (char *), NULL);
257 xbt_dynar_push(ps->frames, &dynar);
261 * gras_cbps_block_end:
263 * End the current block, and go back to the upper one.
266 gras_cbps_block_end(gras_cbps_t ps) {
268 xbt_dynar_t frame = NULL;
272 xbt_assert0(xbt_dynar_length(ps->frames),
273 "More block_end than block_begin");
274 xbt_dynar_pop(ps->frames, &frame);
276 xbt_dynar_foreach(frame, cursor, name) {
278 xbt_dynar_t varstack = NULL;
279 gras_cbps_elm_t var = NULL;
281 DEBUG2("Get ride of %s (%p)",name,(void*)name);
282 xbt_dict_get(ps->space, name, (void **)&varstack);
283 xbt_dynar_pop(varstack, &var);
285 if (!xbt_dynar_length(varstack)) {
286 xbt_dict_remove(ps->space, name);
287 xbt_dynar_free_container(&varstack); /*already empty, save a test ;) */
290 if (var->data) xbt_free(var->data);
294 xbt_dynar_free_container(&frame);/* we just emptied it */
295 DEBUG0("<<< Block end");
302 * Push a new long integer value into the cbps.
305 gras_cbps_i_push(gras_cbps_t ps,
307 DEBUG1("push %d as a size",val);
308 xbt_dynar_push_as(ps->lints,int,val);
313 * Pop the lastly pushed long integer value from the cbps.
316 gras_cbps_i_pop(gras_cbps_t ps) {
319 xbt_assert0(xbt_dynar_length(ps->lints) > 0,
320 "gras_cbps_i_pop: no value to pop");
321 ret = xbt_dynar_pop_as(ps->lints,int);
322 DEBUG1("pop %d as a size",ret);
327 * gras_datadesc_cb_pop:
329 * Generic cb returning the lastly pushed value
331 int gras_datadesc_cb_pop(gras_cbps_t vars, void *data) {
332 return gras_cbps_i_pop(vars);
336 * gras_datadesc_cb_push_int:
338 * Cb to push an integer. Must be attached to the field you want to push
340 void gras_datadesc_cb_push_int(gras_cbps_t vars, void *data) {
342 gras_cbps_i_push(vars, (int) *i);
346 * gras_datadesc_cb_push_uint:
348 * Cb to push an unsigned integer. Must be attached to the field you want to push
350 void gras_datadesc_cb_push_uint(gras_cbps_t vars, void *data) {
351 unsigned int *i = (unsigned int*)data;
352 gras_cbps_i_push(vars, (int) *i);
356 * gras_datadesc_cb_push_lint:
358 * Cb to push an long integer. Must be attached to the field you want to push
360 void gras_datadesc_cb_push_lint(gras_cbps_t vars, void *data) {
361 long int *i = (long int*)data;
362 gras_cbps_i_push(vars, (int) *i);
365 * gras_datadesc_cb_push_ulint:
367 * Cb to push an long integer. Must be attached to the field you want to push
369 void gras_datadesc_cb_push_ulint(gras_cbps_t vars, void *data) {
370 unsigned long int *i = (unsigned long int*)data;
371 gras_cbps_i_push(vars, (int) *i);