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

   1 /*
   2  * Copyright (C) 1995-2008 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 #include "config.h"
  28
  29 #include "assert.h"
  30 #include "irhooks.h"
  31 #include "firmnet.h"
  32 #include "irnode.h"
  33 #include "irgraph.h"
  34 #include "irprintf.h"
  35 #include "irprog.h"
  36 #include "iredges.h"
  37 #include "pset.h"
  38 #include "obst.h"
  39 #include "firmnet.h"
  40
  41 #define SEND_BUF_SIZE 256
  42 #define HASH_EDGE(edge) \
  43         ((get_irn_node_nr((edge)->src) << 17)          | \
  44         ((get_irn_node_nr((edge)->tgt) & 0xEFFF) << 2) | \
  45         ((edge)->pos & 0x3))
  46
  47 typedef struct _exchange_node_outs_assoc_t {
  48         int     n_out_edges;
  49         ir_node *irn;
  50         ir_node *nw;
  51 } exchange_node_outs_assoc_t;
  52
  53 typedef struct _ycomp_edge_t {
  54         ir_node *src;
  55         ir_node *tgt;
  56         int     pos;
  57 } ycomp_edge_t;
  58
  59 enum _firm_ycomp_node_realizer_values {
  60         NODE_REALIZER_NORMAL,
  61         NODE_REALIZER_PROJ,
  62         NODE_REALIZER_BLOCK,
  63         NODE_REALIZER_MEM,
  64         NODE_REALIZER_PHI,
  65         NODE_REALIZER_STARTEND,
  66         NODE_REALIZER_IRG,
  67         NODE_REALIZER_ID,
  68         NODE_REALIZER_LAST
  69 };
  70
  71 typedef struct _firm_ycomp_node_realizer_t {
  72         unsigned   id;
  73         const char *linecolor;
  74         const char *fillcolor;
  75         const char *textcolor;
  76         const char *shape;
  77 } firm_ycomp_node_realizer_t;
  78
  79 static firm_ycomp_node_realizer_t node_realizer[NODE_REALIZER_LAST] = {
  80         { NODE_REALIZER_NORMAL,   "black", "white",    "black", "box" },
  81         { NODE_REALIZER_PROJ,     "black", "yellow",   "black", "box" },
  82         { NODE_REALIZER_BLOCK,    "black", "yellow",   "white", "box" },
  83         { NODE_REALIZER_MEM,      "black", "blue",     "black", "box" },
  84         { NODE_REALIZER_PHI,      "black", "green",    "black", "box" },
  85         { NODE_REALIZER_STARTEND, "black", "blue",     "black", "box" },
  86         { NODE_REALIZER_IRG,      "black", "white",    "white", "box" },
  87         { NODE_REALIZER_ID,       "black", "darkgrey", "black", "box" },
  88 };
  89
  90 enum _firm_ycomp_edge_realizer_values {
  91         EDGE_REALIZER_DATA,
  92         EDGE_REALIZER_MEM,
  93         EDGE_REALIZER_DEP,
  94         EDGE_REALIZER_CFG,
  95         EDGE_REALIZER_LAST
  96 };
  97
  98 typedef struct _firm_ycomp_edge_realizer_t {
  99         unsigned   id;
 100         const char *linecolor;
 101         const char *textcolor;
 102         unsigned   thickness;
 103         const char *style;
 104 } firm_ycomp_edge_realizer_t;
 105
 106 static firm_ycomp_edge_realizer_t edge_realizer[EDGE_REALIZER_LAST] = {
 107         { EDGE_REALIZER_DATA, "black", "black", 1, "continuous" },
 108         { EDGE_REALIZER_MEM,  "blue",  "black", 1, "continuous" },
 109         { EDGE_REALIZER_DEP,  "green", "black", 1, "continuous" },
 110         { EDGE_REALIZER_CFG,  "red",   "black", 1, "continuous" },
 111 };
 112
 113 typedef struct _firm_ycomp_dbg_t {
 114         int            fd;
 115         int            has_data;
 116         pset           *exchanged_nodes;
 117         pset           *edges;
 118         unsigned       in_dead_node_elim : 1;
 119         struct obstack obst;
 120         hook_entry_t   hook_new_irn;
 121         hook_entry_t   hook_new_irg;
 122         hook_entry_t   hook_set_edge;
 123         hook_entry_t   hook_exchange;
 124         hook_entry_t   hook_into_id;
 125         hook_entry_t   hook_dead_node;
 126 } firm_ycomp_dbg_t;
 127
 128 static firm_ycomp_dbg_t yy_dbg;
 129
 130 static int cmp_edges(const void *a, const void *b) {
 131         ycomp_edge_t *e1 = (ycomp_edge_t *)a;
 132         ycomp_edge_t *e2 = (ycomp_edge_t *)b;
 133
 134         return (e1->src != e2->src) || (e1->tgt != e2->tgt) || (e1->pos != e2->pos);
 135 }
 136
 137 static int cmp_nodes(const void *a, const void *b) {
 138         exchange_node_outs_assoc_t *n1 = (exchange_node_outs_assoc_t *)a;
 139         exchange_node_outs_assoc_t *n2 = (exchange_node_outs_assoc_t *)b;
 140
 141         return n1->irn != n2->irn;
 142 }
 143
 144 static INLINE void send_cmd(firm_ycomp_dbg_t *dbg, const char *buf) {
 145         ssize_t res, len;
 146
 147         len = strlen(buf);
 148         res = firmnet_send(dbg->fd, (const void *)buf, len);
 149         assert(res == len);
 150 }
 151
 152 static void wait_for_sync(firm_ycomp_dbg_t *dbg) {
 153         char buf[6];
 154         firmnet_recv(dbg->fd, buf, 6, 5);
 155 }
 156
 157 static void show_and_sync(firm_ycomp_dbg_t *dbg) {
 158         send_cmd(dbg, "show\n");
 159         send_cmd(dbg, "sync\n");
 160         wait_for_sync(dbg);
 161 }
 162
 163 /**
 164  * Register the edge and node realizer in yComp.
 165  */
 166 static void firm_ycomp_debug_init_realizer(firm_ycomp_dbg_t *dbg) {
 167         int  i;
 168         char buf[SEND_BUF_SIZE];
 169
 170         for (i = 0; i < NODE_REALIZER_LAST; ++i) {
 171                 snprintf(buf, sizeof(buf), "addNodeRealizer \"%u\" \"%s\" \"%s\" \"%s\" \"%s\"\n",
 172                         node_realizer[i].id,
 173                         node_realizer[i].linecolor,
 174                         node_realizer[i].fillcolor,
 175                         node_realizer[i].textcolor,
 176                         node_realizer[i].shape);
 177                 send_cmd(dbg, buf);
 178         }
 179
 180         for (i = 0; i < EDGE_REALIZER_LAST; ++i) {
 181                 snprintf(buf, sizeof(buf), "addEdgeRealizer \"%u\" \"%s\" \"%s\" \"%u\" \"%s\"\n",
 182                         edge_realizer[i].id,
 183                         edge_realizer[i].linecolor,
 184                         edge_realizer[i].textcolor,
 185                         edge_realizer[i].thickness,
 186                         edge_realizer[i].style);
 187                 send_cmd(dbg, buf);
 188         }
 189 }
 190
 191 /**
 192  * Retrieve the appropriate realizer for given node.
 193  */
 194 static INLINE unsigned get_node_realizer(ir_node *node) {
 195         unsigned realizer;
 196         ir_opcode opc = get_irn_opcode(node);
 197
 198         switch (opc) {
 199                 case iro_Block:
 200                         realizer = NODE_REALIZER_BLOCK;
 201                         break;
 202                 case iro_Phi:
 203                         realizer = NODE_REALIZER_PHI;
 204                         break;
 205                 case iro_Proj:
 206                         if (get_irn_mode(node) == mode_M)
 207                                 realizer = NODE_REALIZER_MEM;
 208                         else
 209                                 realizer = NODE_REALIZER_PROJ;
 210                         break;
 211                 case iro_Start:
 212                 case iro_End:
 213                         realizer = NODE_REALIZER_STARTEND;
 214                         break;
 215                 default:
 216                         realizer = NODE_REALIZER_NORMAL;
 217         };
 218
 219         return realizer;
 220 }
 221
 222 /**
 223  * Retrieve the appropriate realizer for given edge.
 224  */
 225 static INLINE unsigned get_edge_realizer(ir_node *src, ir_node *tgt) {
 226         unsigned realizer;
 227         ir_mode  *tgt_mode, *src_mode;
 228
 229         if (is_Block(tgt) || is_Block(src))
 230                 return EDGE_REALIZER_CFG;
 231
 232         tgt_mode = get_irn_mode(tgt);
 233         src_mode = is_Block(src) ? NULL : get_irn_mode(src);
 234
 235         if (tgt_mode == mode_M || (src_mode == mode_M && tgt_mode == mode_T))
 236                 realizer = EDGE_REALIZER_MEM;
 237         else if (tgt_mode == mode_X)
 238                 realizer = EDGE_REALIZER_CFG;
 239         else
 240                 realizer = EDGE_REALIZER_DATA;
 241
 242         return realizer;
 243 }
 244
 245 /**
 246  * Hook: Add new nodes, resp. new blocks in yComp and add input edges.
 247  */
 248 static void firm_ycomp_debug_new_node(void *context, ir_graph *graph, ir_node *node) {
 249         firm_ycomp_dbg_t *dbg = context;
 250         char             buf[SEND_BUF_SIZE];
 251         int              i;
 252         unsigned         src_idx;
 253
 254         if (get_const_code_irg() == graph || dbg->in_dead_node_elim)
 255                 return;
 256
 257         src_idx       = get_irn_node_nr(node);
 258         dbg->has_data = 1;
 259
 260         if (is_Block(node)) {
 261                 /* add block (subgraph) */
 262                 ir_snprintf(buf, sizeof(buf), "addSubgraphNode \"%d\" \"%d\" \"%u\" \"%+F\"\n",
 263                         0,                     /* parent id */
 264                         get_irn_node_nr(node), /* graph id */
 265                         NODE_REALIZER_BLOCK,   /* realizer id */
 266                         node);                 /* label */
 267         }
 268         else {
 269                 /* add node */
 270                 ir_snprintf(buf, sizeof(buf), "addNode \"%d\" \"%u\" \"%u\" \"%+F\"\n",
 271                         get_irn_node_nr(get_nodes_block(node)), /* parent id */
 272                         src_idx,                                /* node id */
 273                         get_node_realizer(node),                /* realizer id */
 274                         node);                                  /* label */
 275         }
 276         send_cmd(dbg, buf);
 277
 278         /* add edges */
 279         for (i = get_irn_arity(node) - 1; i >= 0; --i) {
 280                 ir_node      *pred   = get_irn_n(node, i);
 281                 unsigned     tgt_idx = get_irn_node_nr(pred);
 282                 ycomp_edge_t key, *entry;
 283
 284                 ir_snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 285                         src_idx, tgt_idx, i,            /* edge id */
 286                         src_idx,                        /* source node id */
 287                         tgt_idx,                        /* target node id */
 288                         get_edge_realizer(node, pred),  /* realizer id */
 289                         i);                             /* title */
 290                 send_cmd(dbg, buf);
 291
 292                 /* insert edge */
 293                 key.src = node;
 294                 key.tgt = pred;
 295                 key.pos = i;
 296                 entry   = pset_find(dbg->edges, &key, HASH_EDGE(&key));
 297                 if (! entry) {
 298                         entry = obstack_alloc(&dbg->obst, sizeof(*entry));
 299                         entry->src = node;
 300                         entry->tgt = pred;
 301                         entry->pos = i;
 302                         pset_insert(dbg->edges, entry, HASH_EDGE(entry));
 303                 }
 304         }
 305
 306         show_and_sync(dbg);
 307 }
 308
 309 /**
 310  * Clear the old irg if it has some data and create a new one.
 311  */
 312 static void firm_ycomp_debug_new_irg(void *context, ir_graph *irg,
 313                                      ir_entity *ent)
 314 {
 315         firm_ycomp_dbg_t *dbg = context;
 316         char             buf[SEND_BUF_SIZE];
 317         (void) irg;
 318
 319         if (yy_dbg.has_data) {
 320                 send_cmd(dbg, "deleteGraph\n");
 321 //              send_cmd(dbg, "show\n");
 322         }
 323         dbg->has_data = 0;
 324
 325         ir_snprintf(buf, sizeof(buf), "addSubgraphNode \"-1\" \"0\" \"%u\" \"%s\"\n",
 326                 NODE_REALIZER_IRG, get_entity_name(ent));
 327         send_cmd(dbg, buf);
 328         send_cmd(dbg, "sync\n");
 329         wait_for_sync(dbg);
 330 }
 331
 332 /**
 333  * Hook: Handle set_irn_n calls.
 334  * - set new Block      OR
 335  * - remove old edge and add new one
 336  */
 337 static void firm_ycomp_debug_set_edge(void *context, ir_node *src, int pos, ir_node *tgt, ir_node *old_tgt) {
 338         firm_ycomp_dbg_t           *dbg   = context;
 339         exchange_node_outs_assoc_t *entry = NULL;
 340         exchange_node_outs_assoc_t key;
 341         ycomp_edge_t               *old_edge, *new_edge, edge_key;
 342         char                       buf[SEND_BUF_SIZE];
 343         unsigned                   src_idx, tgt_idx;
 344
 345         if (dbg->in_dead_node_elim)
 346                 return;
 347
 348         src_idx = get_irn_node_nr(src);
 349         tgt_idx = get_irn_node_nr(tgt);
 350
 351         /* set_irn_n with pos -1 means: node moves to new block  */
 352         if (pos < 0) {
 353                 if (tgt != old_tgt) {
 354                         snprintf(buf, sizeof(buf), "moveNode \"%d\" \"%d\"\n", src_idx, tgt_idx);
 355                         send_cmd(dbg, buf);
 356                         show_and_sync(dbg);
 357                 }
 358                 return;
 359         }
 360
 361         /* check if the new edge exists */
 362         edge_key.src = src;
 363         edge_key.tgt = tgt;
 364         edge_key.pos = pos;
 365         new_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 366
 367         /* if the new edge already exists and the old target is the new target -> ignore */
 368         if (new_edge && tgt == old_tgt)
 369                 return;
 370
 371         /* check if the old edge exists */
 372         if (old_tgt) {
 373                 int old_tgt_idx = get_irn_node_nr(old_tgt);
 374
 375                 edge_key.src = src;
 376                 edge_key.tgt = old_tgt;
 377                 edge_key.pos = pos;
 378                 old_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 379
 380                 /* check if old target is marked for exchange */
 381                 key.irn = old_tgt;
 382                 entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_tgt));
 383
 384                 if (entry) {
 385                         /* we are called from exchange() */
 386                         entry->n_out_edges--;
 387                 }
 388
 389                 /* delete the old edge if it exists */
 390                 if (old_edge) {
 391                         snprintf(buf, sizeof(buf), "deleteEdge \"n%un%up%d\"\n", src_idx, old_tgt_idx, pos);
 392                         send_cmd(dbg, buf);
 393                         pset_remove(dbg->edges, old_edge, HASH_EDGE(old_edge));
 394                 }
 395         }
 396
 397         if (! new_edge) {
 398                 /* add the new edge if it doesn't exist */
 399                 snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 400                         src_idx, tgt_idx, pos,          /* edge id */
 401                         src_idx,                        /* source node id */
 402                         tgt_idx,                        /* target node id */
 403                         get_edge_realizer(src, tgt),    /* realizer id */
 404                         pos);                           /* title */
 405                 send_cmd(dbg, buf);
 406
 407                 /* insert the new edge */
 408                 new_edge      = obstack_alloc(&dbg->obst, sizeof(*new_edge));
 409                 new_edge->src = src;
 410                 new_edge->tgt = tgt;
 411                 new_edge->pos = pos;
 412                 pset_insert(dbg->edges, new_edge, HASH_EDGE(new_edge));
 413         }
 414
 415         /* show and sync if all edges are rerouted or if it's a normal set_irn_n */
 416         if (! entry || entry->n_out_edges == 0) {
 417                 show_and_sync(dbg);
 418         }
 419 }
 420
 421 /**
 422  * Hook: Put nodes, about to be exchanged into a set.
 423  */
 424 static void firm_ycomp_debug_exchange(void *context, ir_node *old_node, ir_node *new_node) {
 425         firm_ycomp_dbg_t           *dbg = context;
 426         exchange_node_outs_assoc_t key, *entry;
 427
 428         /* put nodes, which are about to be exchanged into a set */
 429
 430         key.irn = old_node;
 431         entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_node));
 432         if (entry) {
 433                 entry->n_out_edges = get_irn_n_edges(old_node);
 434                 entry->nw          = new_node;
 435         }
 436         else {
 437                 entry              = obstack_alloc(&dbg->obst, sizeof(*entry));
 438                 entry->irn         = old_node;
 439                 entry->nw          = new_node;
 440                 entry->n_out_edges = get_irn_n_edges(old_node);
 441                 pset_insert(dbg->exchanged_nodes, entry, HASH_PTR(old_node));
 442         }
 443 }
 444
 445 /**
 446  * Hook: Remove all old in edges, turn node into id node, add new input edge.
 447  */
 448 static void firm_ycomp_debug_turn_into_id(void *context, ir_node *old_node) {
 449         firm_ycomp_dbg_t           *dbg = context;
 450         exchange_node_outs_assoc_t key, *entry;
 451         int                        i;
 452         char                       buf[SEND_BUF_SIZE];
 453         unsigned                   src_idx, tgt_idx;
 454         ycomp_edge_t               edge_key, *new_edge;
 455
 456         key.irn = old_node;
 457         entry   = pset_find(dbg->exchanged_nodes, &key, HASH_PTR(old_node));
 458
 459         assert(entry != NULL && "Exchange entry missing");
 460
 461         src_idx = get_irn_node_nr(old_node);
 462         tgt_idx = get_irn_node_nr(entry->nw);
 463
 464         /* remove all old edges */
 465         for (i = get_irn_arity(old_node) - 1; i >= 0; --i) {
 466                 ycomp_edge_t *old_edge;
 467                 unsigned     old_tgt_idx;
 468
 469                 /* check if the old edge exists */
 470                 edge_key.src = old_node;
 471                 edge_key.tgt = get_irn_n(old_node, i);
 472                 edge_key.pos = i;
 473                 old_edge     = pset_find(dbg->edges, &edge_key, HASH_EDGE(&edge_key));
 474
 475                 old_tgt_idx  = get_irn_node_nr(edge_key.tgt);
 476
 477                 /* remove the old edge */
 478                 if (old_edge) {
 479                         snprintf(buf, sizeof(buf), "deleteEdge \"n%un%up%d\"\n", src_idx, old_tgt_idx, i);
 480                         send_cmd(dbg, buf);
 481                         pset_remove(dbg->edges, old_edge, HASH_EDGE(old_edge));
 482                 }
 483         }
 484
 485         /* change the old node into an id node */
 486         snprintf(buf, sizeof(buf), "changeNode \"%ld\" \"%u\"\n", get_irn_node_nr(old_node), NODE_REALIZER_ID);
 487         send_cmd(dbg, buf);
 488
 489         /* add new Id input */
 490         snprintf(buf, sizeof(buf), "addEdge \"n%un%up%d\" \"%u\" \"%u\" \"%u\" \"%d\"\n",
 491                 src_idx, tgt_idx, 0,                       /* edge id */
 492                 src_idx,                                   /* source node id */
 493                 tgt_idx,                                   /* target node id */
 494                 get_edge_realizer(old_node, entry->nw),    /* realizer id */
 495                 0);                                        /* title */
 496         send_cmd(dbg, buf);
 497
 498         /* go */
 499         show_and_sync(dbg);
 500
 501         /* add the new edge to our pset */
 502         new_edge = obstack_alloc(&dbg->obst, sizeof(*new_edge));
 503         new_edge->src = old_node;
 504         new_edge->tgt = entry->nw;
 505         new_edge->pos = 0;
 506         pset_insert(dbg->edges, new_edge, HASH_EDGE(new_edge));
 507 }
 508
 509 /**
 510  * Hook: Just mark start/end of dead node elimination.
 511  */
 512 static void firm_ycomp_debug_dead_node_elim(void *context, ir_graph *irg, int start) {
 513         firm_ycomp_dbg_t *dbg  = context;
 514         (void) irg;
 515         dbg->in_dead_node_elim = start != 0;
 516 }
 517
 518 /**
 519  * Establish connection to yComp and register all hooks.
 520  */
 521 void firm_init_ycomp_debugger(const char *host, unsigned port) {
 522         static int init_once = 0;
 523
 524         if (init_once)
 525                 return;
 526
 527         memset(&yy_dbg, 0, sizeof(yy_dbg));
 528         yy_dbg.fd = -1;
 529
 530         fprintf(stderr, "connecting to %s:%u\n", host, port);
 531         yy_dbg.fd = firmnet_connect_tcp(host, port);
 532
 533         if (yy_dbg.fd > -1) {
 534                 /* We could establish a connection to ycomp -> register hooks */
 535                 firm_ycomp_debug_init_realizer(&yy_dbg);
 536                 yy_dbg.exchanged_nodes = new_pset(cmp_nodes, 20);
 537                 yy_dbg.edges           = new_pset(cmp_edges, 20);
 538                 obstack_init(&yy_dbg.obst);
 539
 540 #define REGISTER_HOOK(ycomp_hook, firm_hook, func)     \
 541         do {                                               \
 542                 yy_dbg.ycomp_hook.context           = &yy_dbg; \
 543                 yy_dbg.ycomp_hook.hook._##firm_hook = func;    \
 544                 register_hook(firm_hook, &yy_dbg.ycomp_hook);  \
 545         } while(0)
 546
 547                 REGISTER_HOOK(hook_new_irn,   hook_new_node,       firm_ycomp_debug_new_node);
 548                 REGISTER_HOOK(hook_new_irg,   hook_new_graph,      firm_ycomp_debug_new_irg);
 549                 REGISTER_HOOK(hook_set_edge,  hook_set_irn_n,      firm_ycomp_debug_set_edge);
 550                 REGISTER_HOOK(hook_exchange,  hook_replace,        firm_ycomp_debug_exchange);
 551                 REGISTER_HOOK(hook_into_id,   hook_turn_into_id,   firm_ycomp_debug_turn_into_id);
 552                 REGISTER_HOOK(hook_dead_node, hook_dead_node_elim, firm_ycomp_debug_dead_node_elim);
 553
 554 #undef REGISTER_HOOK
 555         }
 556
 557         init_once = 1;
 558 }
 559
 560 /**
 561  * Close connection to yComp, unregister all hooks and free memory.
 562  */
 563 void firm_finish_ycomp_debugger(void) {
 564         if (yy_dbg.fd > -1) {
 565                 /* close connection */
 566                 firmnet_close_socket(yy_dbg.fd);
 567                 yy_dbg.fd = -1;
 568
 569                 /* unregister all hooks */
 570                 unregister_hook(hook_new_graph,      &yy_dbg.hook_new_irg);
 571                 unregister_hook(hook_new_node,       &yy_dbg.hook_new_irn);
 572                 unregister_hook(hook_set_irn_n,      &yy_dbg.hook_set_edge);
 573                 unregister_hook(hook_replace,        &yy_dbg.hook_exchange);
 574                 unregister_hook(hook_dead_node_elim, &yy_dbg.hook_dead_node);
 575                 unregister_hook(hook_turn_into_id,   &yy_dbg.hook_into_id);
 576
 577                 /* clear sets */
 578                 del_pset(yy_dbg.exchanged_nodes);
 579                 del_pset(yy_dbg.edges);
 580
 581                 /* free data obstack */
 582                 obstack_free(&yy_dbg.obst, NULL);
 583         }
 584 }