nsz Git - libfirm/blob - ir/debug/firm_ycomp.c

   1 /*
   2  * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief      Connect firm to ycomp
  23  * @author     Christian Wuerdig
  24  * @date       16.11.2006
  25  * @version    $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif /* HAVE_CONFIG_H */
  30
  31 #include "assert.h"
  32 #include "irhooks.h"
  33 #include "firmnet.h"
  34 #include "irnode.h"
  35 #include "irgraph.h"
  36 #include "irprintf.h"
  37 #include "irprog.h"
  38 #include "iredges.h"
  39 #include "pset.h"
  40 #include "obst.h"
  41 #include "firmnet.h"
  42
  43 #define SEND_BUF_SIZE 256
  44 #define HASH_EDGE(edge) \
  45         ((get_irn_node_nr((edge)->src) << 17)          | \
  46         ((get_irn_node_nr((edge)->tgt) & 0xEFFF) << 2) | \
  47         ((edge)->pos & 0x3))
  48
  49 typedef struct _exchange_node_outs_assoc_t {
  50         int     n_out_edges;
  51         ir_node *irn;
  52         ir_node *nw;
  53 } exchange_node_outs_assoc_t;
  54
  55 typedef struct _ycomp_edge_t {
  56         ir_node *src;
  57         ir_node *tgt;
  58         int     pos;
  59 } ycomp_edge_t;
  60
  61 enum _firm_ycomp_node_realizer_values {
  62         NODE_REALIZER_NORMAL,
  63         NODE_REALIZER_PROJ,
  64         NODE_REALIZER_BLOCK,
  65         NODE_REALIZER_MEM,
  66         NODE_REALIZER_PHI,
  67         NODE_REALIZER_STARTEND,
  68         NODE_REALIZER_IRG,
  69         NODE_REALIZER_ID,
  70         NODE_REALIZER_LAST
  71 };
  72
  73 typedef struct _firm_ycomp_node_realizer_t {
  74         unsigned   id;
  75         const char *linecolor;
  76         const char *fillcolor;
  77         const char *textcolor;
  78         const char *shape;
  79 } firm_ycomp_node_realizer_t;
  80
  81 static firm_ycomp_node_realizer_t node_realizer[NODE_REALIZER_LAST] = {
  82         { NODE_REALIZER_NORMAL,   "black", "white",    "black", "box" },
  83         { NODE_REALIZER_PROJ,     "black", "yellow",   "black", "box" },
  84         { NODE_REALIZER_BLOCK,    "black", "yellow",   "white", "box" },
  85         { NODE_REALIZER_MEM,      "black", "blue",     "black", "box" },
  86         { NODE_REALIZER_PHI,      "black", "green",    "black", "box" },
  87         { NODE_REALIZER_STARTEND, "black", "blue",     "black", "box" },
  88         { NODE_REALIZER_IRG,      "black", "white",    "white", "box" },
  89         { NODE_REALIZER_ID,       "black", "darkgrey", "black", "box" },
  90 };
  91
  92 enum _firm_ycomp_edge_realizer_values {
  93         EDGE_REALIZER_DATA,
  94         EDGE_REALIZER_MEM,
  95         EDGE_REALIZER_DEP,
  96         EDGE_REALIZER_CFG,
  97         EDGE_REALIZER_LAST
  98 };
  99
 100 typedef struct _firm_ycomp_edge_realizer_t {
 101         unsigned   id;
 102         const char *linecolor;
 103         const char *textcolor;
 104         unsigned   thickness;
 105         const char *style;
 106 } firm_ycomp_edge_realizer_t;
 107
 108 static firm_ycomp_edge_realizer_t edge_realizer[EDGE_REALIZER_LAST] = {
 109         { EDGE_REALIZER_DATA, "black", "black", 1, "continuous" },
 110         { EDGE_REALIZER_MEM,  "blue",  "black", 1, "continuous" },
 111         { EDGE_REALIZER_DEP,  "green", "black", 1, "continuous" },
 112         { EDGE_REALIZER_CFG,  "red",   "black", 1, "continuous" },
 113 };
 114
 115 typedef struct _firm_ycomp_dbg_t {
 116         int            fd;
 117         int            has_data;
 118         pset           *exchanged_nodes;
 119         pset           *edges;
 120         unsigned       in_dead_node_elim : 1;
 121         struct obstack obst;
 122         hook_entry_t   hook_new_irn;
 123         hook_entry_t   hook_new_irg;
 124         hook_entry_t   hook_set_edge;
 125         hook_entry_t   hook_exchange;
 126         hook_entry_t   hook_into_id;
 127         hook_entry_t   hook_dead_node;
 128 } firm_ycomp_dbg_t;
 129
 130 static firm_ycomp_dbg_t yy_dbg;
 131
 132 static int cmp_edges(const void *a, const void *b) {
 133         ycomp_edge_t *e1 = (ycomp_edge_t *)a;
 134         ycomp_edge_t *e2 = (ycomp_edge_t *)b;
 135
 136         return (e1->src != e2->src) || (e1->tgt != e2->tgt) || (e1->pos != e2->pos);
 137 }
 138
 139 static int cmp_nodes(const void *a, const void *b) {
 140         exchange_node_outs_assoc_t *n1 = (exchange_node_outs_assoc_t *)a;
 141         exchange_node_outs_assoc_t *n2 = (exchange_node_outs_assoc_t *)b;
 142
 143         return n1->irn != n2->irn;
 144 }
 145
 146 static INLINE void send_cmd(firm_ycomp_dbg_t *dbg, const char *buf) {
 147         ssize_t res, len;
 148
 149         len = strlen(buf);
 150         res = firmnet_send(dbg->fd, (const void *)buf, len);
 151         assert(res == len);
 152 }
 153
 154 static void wait_for_sync(firm_ycomp_dbg_t *dbg) {
 155         char buf[6];
 156         firmnet_recv(dbg->fd, buf, 6, 5);
 157 }
 158
 159 static void show_and_sync(firm_ycomp_dbg_t *dbg) {
 160         send_cmd(dbg, "show\n");
 161         send_cmd(dbg, "sync\n");
 162         wait_for_sync(dbg);
 163 }
 164
 165 /**
 166  * Register the edge and node realizer in yComp.
 167  */
 168 static void firm_ycomp_debug_init_realizer(firm_ycomp_dbg_t *dbg) {
 169         int  i;
 170         char buf[SEND_BUF_SIZE];
 171
 172         for (i = 0; i < NODE_REALIZER_LAST; ++i) {
 173                 snprintf(buf, sizeof(buf), "addNodeRealizer \"%u\" \"%s\" \"%s\" \"%s\" \"%s\"\n",
 174                         node_realizer[i].id,
 175                         node_realizer[i].linecolor,
 176                         node_realizer[i].fillcolor,
 177                         node_realizer[i].textcolor,
 178                         node_realizer[i].shape);
 179                 send_cmd(dbg, buf);
 180         }
 181
 182         for (i = 0; i < EDGE_REALIZER_LAST; ++i) {
 183                 snprintf(buf, sizeof(buf), "addEdgeRealizer \"%u\" \"%s\" \"%s\" \"%u\" \"%s\"\n",
 184                         edge_realizer[i].id,
 185                         edge_realizer[i].linecolor,
 186                         edge_realizer[i].textcolor,
 187                         edge_realizer[i].thickness,
 188                         edge_realizer[i].style);
 189                 send_cmd(dbg, buf);
 190         }
 191 }
 192
 193 /**
 194  * Retrieve the appropriate realizer for given node.
 195  */
 196 static INLINE unsigned get_node_realizer(ir_node *node) {
 197         unsigned realizer;
 198         ir_opcode opc = get_irn_opcode(node);
 199
 200         switch (opc) {
 201                 case iro_Block:
 202                         realizer = NODE_REALIZER_BLOCK;
 203                         break;
 204                 case iro_Phi:
 205                         realizer = NODE_REALIZER_PHI;
 206                         break;
 207                 case iro_Proj:
 208                         if (get_irn_mode(node) == mode_M)
 209                                 realizer = NODE_REALIZER_MEM;
 210                         else
 211                                 realizer = NODE_REALIZER_PROJ;
 212                         break;
 213                 case iro_Start:
 214                 case iro_End:
 215                         realizer = NODE_REALIZER_STARTEND;
 216                         break;
 217                 default:
 218                         realizer = NODE_REALIZER_NORMAL;
 219         };
 220
 221         return realizer;
 222 }
 223
 224 /**
 225  * Retrieve the appropriate realizer for given edge.
 226  */
 227 static INLINE unsigned get_edge_realizer(ir_node *src, ir_node *tgt) {
 228         unsigned realizer;
 229         ir_mode  *tgt_mode, *src_mode;
 230
 231         if (is_Block(tgt) || is_Block(src))
 232                 return EDGE_REALIZER_CFG;
 233
 234         tgt_mode = get_irn_mode(tgt);
 235         src_mode = is_Block(src) ? NULL : get_irn_mode(src);
 236
 237         if (tgt_mode == mode_M || (src_mode == mode_M && tgt_mode == mode_T))
 238                 realizer = EDGE_REALIZER_MEM;
 239         else if (tgt_mode == mode_X)
 240                 realizer = EDGE_REALIZER_CFG;
 241         else
 242                 realizer = EDGE_REALIZER_DATA;
 243
 244         return realizer;
 245 }
 246
 247 /**
 248  * Hook: Add new nodes, resp. new blocks in yComp and add input edges.
 249  */
 250 static void firm_ycomp_debug_new_node(void *context, ir_graph *graph, ir_node *node) {
 251         firm_ycomp_dbg_t *dbg = context;
 252         char             buf[SEND_BUF_SIZE];
 253         int              i;
 254         unsigned         src_idx;
 255
 256         if (get_const_code_irg() == graph || dbg->in_dead_node_elim)
 257                 return;
 258
 259         src_idx       = get_irn_node_nr(node);
 260         dbg->has_data = 1;
 261
 262         if (is_Block(node)) {
 263                 /* add block (subgraph) */
 264                 ir_snprintf(buf, sizeof(buf), "addSubgraphNode \"%d\" \"%d\" \"%u\" \"%+F\"\n",
 265                         0,                     /* parent id */
 266                         get_irn_node_nr(node), /* graph id */
 267                         NODE_REALIZER_BLOCK,   /* realizer id */
 268                         node);                 /* label */
 269         }
 270         else {
 271                 /* add node */
 272                 ir_snprintf(buf, sizeof(buf), "addNode \"%d\" \"%u\" \"%u\" \"%+F\"\n",
 273                         get_irn_node_nr(get_nodes_block(node)), /* parent id */
 274                         src_idx,                                /* node id */
 275                         get_node_realizer(node),                /* realizer id */
 276                         node);                                  /* label */
 277         }
 278         send_cmd(dbg, buf);
 279
 280         /* add edges */
 281         for (i = get_irn_arity(node) - 1; i >= 0; --i) {
 282                 ir_node      *pred   = get_irn_n(node, i);
 283                 unsigned     tgt_idx = get_irn_node_nr(pred);
 284                 ycomp_edge_t key, *entry;
 285
 286                 ir_snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 287                         src_idx, tgt_idx, i,            /* edge id */
 288                         src_idx,                        /* source node id */
 289                         tgt_idx,                        /* target node id */
 290                         get_edge_realizer(node, pred),  /* realizer id */
 291                         i);                             /* title */
 292                 send_cmd(dbg, buf);
 293
 294                 /* insert edge */
 295                 key.src = node;
 296                 key.tgt = pred;
 297                 key.pos = i;
 298                 entry   = pset_find(dbg->edges, &key, HASH_EDGE(&key));
 299                 if (! entry) {
 300                         entry = obstack_alloc(&dbg->obst, sizeof(*entry));
 301                         entry->src = node;
 302                         entry->tgt = pred;
 303                         entry->pos = i;
 304                         pset_insert(dbg->edges, entry, HASH_EDGE(entry));
 305                 }
 306         }
 307
 308         show_and_sync(dbg);
 309 }
 310
 311 /**
 312  * Clear the old irg if it has some data and create a new one.
 313  */
 314 static void firm_ycomp_debug_new_irg(void *context, ir_graph *irg,
 315                                      ir_entity *ent)
 316 {
 317         firm_ycomp_dbg_t *dbg = context;
 318         char             buf[SEND_BUF_SIZE];
 319         (void) irg;
 320
 321         if (yy_dbg.has_data) {
 322                 send_cmd(dbg, "deleteGraph\n");
 323 //              send_cmd(dbg, "show\n");
 324         }
 325         dbg->has_data = 0;
 326
 327         ir_snprintf(buf, sizeof(buf), "addSubgraphNode \"-1\" \"0\" \"%u\" \"%s\"\n",
 328                 NODE_REALIZER_IRG, get_entity_name(ent));
 329         send_cmd(dbg, buf);
 330         send_cmd(dbg, "sync\n");
 331         wait_for_sync(dbg);
 332 }
 333
 334 /**
 335  * Hook: Handle set_irn_n calls.
 336  * - set new Block      OR
 337  * - remove old edge and add new one
 338  */
 339 static void firm_ycomp_debug_set_edge(void *context, ir_node *src, int pos, ir_node *tgt, ir_node *old_tgt) {
 340         firm_ycomp_dbg_t           *dbg   = context;
 341         exchange_node_outs_assoc_t *entry = NULL;
 342         exchange_node_outs_assoc_t key;
 343         ycomp_edge_t               *old_edge, *new_edge, edge_key;
 344         char                       buf[SEND_BUF_SIZE];
 345         unsigned                   src_idx, tgt_idx;
 346
 347         if (dbg->in_dead_node_elim)
 348                 return;
 349
 350         src_idx = get_irn_node_nr(src);
 351         tgt_idx = get_irn_node_nr(tgt);
 352
 353         /* set_irn_n with pos -1 means: node moves to new block  */
 354         if (pos < 0) {
 355                 if (tgt != old_tgt) {
 356                         snprintf(buf, sizeof(buf), "moveNode \"%d\" \"%d\"\n", src_idx, tgt_idx);
 357                         send_cmd(dbg, buf);
 358                         show_and_sync(dbg);
 359                 }
 360                 return;
 361         }
 362
 363         /* check if the new edge exists */
 364         edge_key.src = src;
 365         edge_key.tgt = tgt;
 366         edge_key.pos = pos;
 367         new_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 368
 369         /* if the new edge already exists and the old target is the new target -> ignore */
 370         if (new_edge && tgt == old_tgt)
 371                 return;
 372
 373         /* check if the old edge exists */
 374         if (old_tgt) {
 375                 int old_tgt_idx = get_irn_node_nr(old_tgt);
 376
 377                 edge_key.src = src;
 378                 edge_key.tgt = old_tgt;
 379                 edge_key.pos = pos;
 380                 old_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 381
 382                 /* check if old target is marked for exchange */
 383                 key.irn = old_tgt;
 384                 entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_tgt));
 385
 386                 if (entry) {
 387                         /* we are called from exchange() */
 388                         entry->n_out_edges--;
 389                 }
 390
 391                 /* delete the old edge if it exists */
 392                 if (old_edge) {
 393                         snprintf(buf, sizeof(buf), "deleteEdge \"n%un%up%d\"\n", src_idx, old_tgt_idx, pos);
 394                         send_cmd(dbg, buf);
 395                         pset_remove(dbg->edges, old_edge, HASH_EDGE(old_edge));
 396                 }
 397         }
 398
 399         if (! new_edge) {
 400                 /* add the new edge if it doesn't exist */
 401                 snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 402                         src_idx, tgt_idx, pos,          /* edge id */
 403                         src_idx,                        /* source node id */
 404                         tgt_idx,                        /* target node id */
 405                         get_edge_realizer(src, tgt),    /* realizer id */
 406                         pos);                           /* title */
 407                 send_cmd(dbg, buf);
 408
 409                 /* insert the new edge */
 410                 new_edge      = obstack_alloc(&dbg->obst, sizeof(*new_edge));
 411                 new_edge->src = src;
 412                 new_edge->tgt = tgt;
 413                 new_edge->pos = pos;
 414                 pset_insert(dbg->edges, new_edge, HASH_EDGE(new_edge));
 415         }
 416
 417         /* show and sync if all edges are rerouted or if it's a normal set_irn_n */
 418         if (! entry || entry->n_out_edges == 0) {
 419                 show_and_sync(dbg);
 420         }
 421 }
 422
 423 /**
 424  * Hook: Put nodes, about to be exchanged into a set.
 425  */
 426 static void firm_ycomp_debug_exchange(void *context, ir_node *old_node, ir_node *new_node) {
 427         firm_ycomp_dbg_t           *dbg = context;
 428         exchange_node_outs_assoc_t key, *entry;
 429
 430         /* put nodes, which are about to be exchanged into a set */
 431
 432         key.irn = old_node;
 433         entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_node));
 434         if (entry) {
 435                 entry->n_out_edges = get_irn_n_edges(old_node);
 436                 entry->nw          = new_node;
 437         }
 438         else {
 439                 entry              = obstack_alloc(&dbg->obst, sizeof(*entry));
 440                 entry->irn         = old_node;
 441                 entry->nw          = new_node;
 442                 entry->n_out_edges = get_irn_n_edges(old_node);
 443                 pset_insert(dbg->exchanged_nodes, entry, HASH_PTR(old_node));
 444         }
 445 }
 446
 447 /**
 448  * Hook: Remove all old in edges, turn node into id node, add new input edge.
 449  */
 450 static void firm_ycomp_debug_turn_into_id(void *context, ir_node *old_node) {
 451         firm_ycomp_dbg_t           *dbg = context;
 452         exchange_node_outs_assoc_t key, *entry;
 453         int                        i;
 454         char                       buf[SEND_BUF_SIZE];
 455         unsigned                   src_idx, tgt_idx;
 456         ycomp_edge_t               edge_key, *new_edge;
 457
 458         key.irn = old_node;
 459         entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_node));
 460
 461         assert(entry != NULL && "Exchange entry missing");
 462
 463         src_idx = get_irn_node_nr(old_node);
 464         tgt_idx = get_irn_node_nr(entry->nw);
 465
 466         /* remove all old edges */
 467         for (i = get_irn_arity(old_node) - 1; i >= 0; --i) {
 468                 ycomp_edge_t *old_edge;
 469                 unsigned     old_tgt_idx;
 470
 471                 /* check if the old edge exists */
 472                 edge_key.src = old_node;
 473                 edge_key.tgt = get_irn_n(old_node, i);
 474                 edge_key.pos = i;
 475                 old_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 476
 477                 old_tgt_idx  = get_irn_node_nr(edge_key.tgt);
 478
 479                 /* remove the old edge */
 480                 if (old_edge) {
 481                         snprintf(buf, sizeof(buf), "deleteEdge \"n%un%up%d\"\n", src_idx, old_tgt_idx, i);
 482                         send_cmd(dbg, buf);
 483                         pset_remove(dbg->edges, old_edge, HASH_EDGE(old_edge));
 484                 }
 485         }
 486
 487         /* change the old node into an id node */
 488         snprintf(buf, sizeof(buf), "changeNode \"%ld\" \"%u\"\n", get_irn_node_nr(old_node), NODE_REALIZER_ID);
 489         send_cmd(dbg, buf);
 490
 491         /* add new Id input */
 492         snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 493                 src_idx, tgt_idx, 0,                       /* edge id */
 494                 src_idx,                                   /* source node id */
 495                 tgt_idx,                                   /* target node id */
 496                 get_edge_realizer(old_node, entry->nw),    /* realizer id */
 497                 0);                                        /* title */
 498         send_cmd(dbg, buf);
 499
 500         /* go */
 501         show_and_sync(dbg);
 502
 503         /* add the new edge to our pset */
 504         new_edge = obstack_alloc(&dbg->obst, sizeof(*new_edge));
 505         new_edge->src = old_node;
 506         new_edge->tgt = entry->nw;
 507         new_edge->pos = 0;
 508         pset_insert(dbg->edges, new_edge, HASH_EDGE(new_edge));
 509 }
 510
 511 /**
 512  * Hook: Just mark start/end of dead node elimination.
 513  */
 514 static void firm_ycomp_debug_dead_node_elim(void *context, ir_graph *irg, int start) {
 515         firm_ycomp_dbg_t *dbg  = context;
 516         (void) irg;
 517         dbg->in_dead_node_elim = start != 0;
 518 }
 519
 520 /**
 521  * Establish connection to yComp and register all hooks.
 522  */
 523 void firm_init_ycomp_debugger(const char *host, unsigned port) {
 524         static int init_once = 0;
 525
 526         if (init_once)
 527                 return;
 528
 529         memset(&yy_dbg, 0, sizeof(yy_dbg));
 530         yy_dbg.fd = -1;
 531
 532         fprintf(stderr, "connecting to %s:%u\n", host, port);
 533         yy_dbg.fd = firmnet_connect_tcp(host, port);
 534
 535         if (yy_dbg.fd > -1) {
 536                 /* We could establish a connection to ycomp -> register hooks */
 537                 firm_ycomp_debug_init_realizer(&yy_dbg);
 538                 yy_dbg.exchanged_nodes = new_pset(cmp_nodes, 20);
 539                 yy_dbg.edges           = new_pset(cmp_edges, 20);
 540                 obstack_init(&yy_dbg.obst);
 541
 542 #define REGISTER_HOOK(ycomp_hook, firm_hook, func)     \
 543         do {                                               \
 544                 yy_dbg.ycomp_hook.context           = &yy_dbg; \
 545                 yy_dbg.ycomp_hook.hook._##firm_hook = func;    \
 546                 register_hook(firm_hook, &yy_dbg.ycomp_hook);  \
 547         } while(0)
 548
 549                 REGISTER_HOOK(hook_new_irn,   hook_new_node,       firm_ycomp_debug_new_node);
 550                 REGISTER_HOOK(hook_new_irg,   hook_new_graph,      firm_ycomp_debug_new_irg);
 551                 REGISTER_HOOK(hook_set_edge,  hook_set_irn_n,      firm_ycomp_debug_set_edge);
 552                 REGISTER_HOOK(hook_exchange,  hook_replace,        firm_ycomp_debug_exchange);
 553                 REGISTER_HOOK(hook_into_id,   hook_turn_into_id,   firm_ycomp_debug_turn_into_id);
 554                 REGISTER_HOOK(hook_dead_node, hook_dead_node_elim, firm_ycomp_debug_dead_node_elim);
 555
 556 #undef REGISTER_HOOK
 557         }
 558
 559         init_once = 1;
 560 }
 561
 562 /**
 563  * Close connection to yComp, unregister all hooks and free memory.
 564  */
 565 void firm_finish_ycomp_debugger(void) {
 566         if (yy_dbg.fd > -1) {
 567                 /* close connection */
 568                 firmnet_close_socket(yy_dbg.fd);
 569                 yy_dbg.fd = -1;
 570
 571                 /* unregister all hooks */
 572                 unregister_hook(hook_new_graph,      &yy_dbg.hook_new_irg);
 573                 unregister_hook(hook_new_node,       &yy_dbg.hook_new_irn);
 574                 unregister_hook(hook_set_irn_n,      &yy_dbg.hook_set_edge);
 575                 unregister_hook(hook_replace,        &yy_dbg.hook_exchange);
 576                 unregister_hook(hook_dead_node_elim, &yy_dbg.hook_dead_node);
 577                 unregister_hook(hook_turn_into_id,   &yy_dbg.hook_into_id);
 578
 579                 /* clear sets */
 580                 del_pset(yy_dbg.exchanged_nodes);
 581                 del_pset(yy_dbg.edges);
 582
 583                 /* free data obstack */
 584                 obstack_free(&yy_dbg.obst, NULL);
 585         }
 586 }