smatch_function_hooks.c

   1 /*
   2  * sparse/smatch_function_hooks.c
   3  *
   4  * Copyright (C) 2009 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * There are several types of function hooks:
  12  * add_function_hook()        - For any time a function is called.
  13  * add_function_assign_hook() - foo = the_function().
  14  * add_implied_return_hook()  - Calculates the implied return value.
  15  * add_macro_assign_hook()    - foo = the_macro().
  16  * return_implies_state()     - For when a return value of 1 implies locked
  17  *                              and 0 implies unlocked. etc. etc.
  18  *
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include "smatch.h"
  24 #include "smatch_slist.h"
  25 #include "smatch_extra.h"
  26 #include "smatch_function_hashtable.h"
  27
  28 struct fcall_back {
  29         int type;
  30         struct data_range *range;
  31         union {
  32                 func_hook *call_back;
  33                 implication_hook *ranged;
  34                 implied_return_hook *implied_return;
  35         } u;
  36         void *info;
  37 };
  38
  39 ALLOCATOR(fcall_back, "call backs");
  40 DECLARE_PTR_LIST(call_back_list, struct fcall_back);
  41
  42 DEFINE_FUNCTION_HASHTABLE_STATIC(callback, struct fcall_back, struct call_back_list);
  43 static struct hashtable *func_hash;
  44
  45 #define REGULAR_CALL       0
  46 #define RANGED_CALL        1
  47 #define ASSIGN_CALL        2
  48 #define IMPLIED_RETURN     3
  49 #define MACRO_ASSIGN       4
  50 #define MACRO_ASSIGN_EXTRA 5
  51
  52 struct return_implies_callback {
  53         int type;
  54         return_implies_hook *callback;
  55 };
  56 ALLOCATOR(return_implies_callback, "return_implies callbacks");
  57 DECLARE_PTR_LIST(db_implies_list, struct return_implies_callback);
  58 static struct db_implies_list *db_return_states_list;
  59
  60 static struct fcall_back *alloc_fcall_back(int type, void *call_back,
  61                                            void *info)
  62 {
  63         struct fcall_back *cb;
  64
  65         cb = __alloc_fcall_back(0);
  66         cb->type = type;
  67         cb->u.call_back = call_back;
  68         cb->info = info;
  69         return cb;
  70 }
  71
  72 void add_function_hook(const char *look_for, func_hook *call_back, void *info)
  73 {
  74         struct fcall_back *cb;
  75
  76         cb = alloc_fcall_back(REGULAR_CALL, call_back, info);
  77         add_callback(func_hash, look_for, cb);
  78 }
  79
  80 void add_function_assign_hook(const char *look_for, func_hook *call_back,
  81                               void *info)
  82 {
  83         struct fcall_back *cb;
  84
  85         cb = alloc_fcall_back(ASSIGN_CALL, call_back, info);
  86         add_callback(func_hash, look_for, cb);
  87 }
  88
  89 void add_implied_return_hook(const char *look_for,
  90                              implied_return_hook *call_back,
  91                              void *info)
  92 {
  93         struct fcall_back *cb;
  94
  95         cb = alloc_fcall_back(IMPLIED_RETURN, call_back, info);
  96         add_callback(func_hash, look_for, cb);
  97 }
  98
  99 void add_macro_assign_hook(const char *look_for, func_hook *call_back,
 100                         void *info)
 101 {
 102         struct fcall_back *cb;
 103
 104         cb = alloc_fcall_back(MACRO_ASSIGN, call_back, info);
 105         add_callback(func_hash, look_for, cb);
 106 }
 107
 108 void add_macro_assign_hook_extra(const char *look_for, func_hook *call_back,
 109                         void *info)
 110 {
 111         struct fcall_back *cb;
 112
 113         cb = alloc_fcall_back(MACRO_ASSIGN_EXTRA, call_back, info);
 114         add_callback(func_hash, look_for, cb);
 115 }
 116
 117 void return_implies_state(const char *look_for, long long start, long long end,
 118                          implication_hook *call_back, void *info)
 119 {
 120         struct fcall_back *cb;
 121
 122         cb = alloc_fcall_back(RANGED_CALL, call_back, info);
 123         cb->range = alloc_range_perm(ll_to_sval(start), ll_to_sval(end));
 124         add_callback(func_hash, look_for, cb);
 125 }
 126
 127 void add_db_return_states_callback(int type, return_implies_hook *callback)
 128 {
 129         struct return_implies_callback *cb = __alloc_return_implies_callback(0);
 130
 131         cb->type = type;
 132         cb->callback = callback;
 133         add_ptr_list(&db_return_states_list, cb);
 134 }
 135
 136 static int call_call_backs(struct call_back_list *list, int type,
 137                             const char *fn, struct expression *expr)
 138 {
 139         struct fcall_back *tmp;
 140         int handled = 0;
 141
 142         FOR_EACH_PTR(list, tmp) {
 143                 if (tmp->type == type) {
 144                         (tmp->u.call_back)(fn, expr, tmp->info);
 145                         handled = 1;
 146                 }
 147         } END_FOR_EACH_PTR(tmp);
 148
 149         return handled;
 150 }
 151
 152 static void call_ranged_call_backs(struct call_back_list *list,
 153                                 const char *fn, struct expression *call_expr,
 154                                 struct expression *assign_expr)
 155 {
 156         struct fcall_back *tmp;
 157
 158         FOR_EACH_PTR(list, tmp) {
 159                 (tmp->u.ranged)(fn, call_expr, assign_expr, tmp->info);
 160         } END_FOR_EACH_PTR(tmp);
 161 }
 162
 163 static struct call_back_list *get_same_ranged_call_backs(struct call_back_list *list,
 164                                                 struct data_range *drange)
 165 {
 166         struct call_back_list *ret = NULL;
 167         struct fcall_back *tmp;
 168
 169         FOR_EACH_PTR(list, tmp) {
 170                 if (tmp->type != RANGED_CALL)
 171                         continue;
 172                 if (ranges_equiv(tmp->range, drange))
 173                         add_ptr_list(&ret, tmp);
 174         } END_FOR_EACH_PTR(tmp);
 175         return ret;
 176 }
 177
 178 static int in_list_exact_sval(struct range_list *list, struct data_range *drange)
 179 {
 180         struct data_range *tmp;
 181
 182         FOR_EACH_PTR(list, tmp) {
 183                 if (ranges_equiv(tmp, drange))
 184                         return 1;
 185         } END_FOR_EACH_PTR(tmp);
 186         return 0;
 187 }
 188
 189 static int assign_ranged_funcs(const char *fn, struct expression *expr,
 190                                  struct call_back_list *call_backs)
 191 {
 192         struct fcall_back *tmp;
 193         struct sm_state *sm;
 194         char *var_name;
 195         struct symbol *sym;
 196         struct smatch_state *estate;
 197         struct state_list *tmp_slist;
 198         struct state_list *final_states = NULL;
 199         struct range_list *handled_ranges = NULL;
 200         struct call_back_list *same_range_call_backs = NULL;
 201         int handled = 0;
 202
 203         if (!call_backs)
 204                 return 0;
 205
 206         var_name = get_variable_from_expr(expr->left, &sym);
 207         if (!var_name || !sym)
 208                 goto free;
 209
 210         FOR_EACH_PTR(call_backs, tmp) {
 211                 if (tmp->type != RANGED_CALL)
 212                         continue;
 213
 214                 if (in_list_exact_sval(handled_ranges, tmp->range))
 215                         continue;
 216                 __push_fake_cur_slist();
 217                 tack_on(&handled_ranges, tmp->range);
 218
 219                 same_range_call_backs = get_same_ranged_call_backs(call_backs, tmp->range);
 220                 call_ranged_call_backs(same_range_call_backs, fn, expr->right, expr);
 221                 __free_ptr_list((struct ptr_list **)&same_range_call_backs);
 222
 223                 estate = alloc_estate_range(tmp->range->min, tmp->range->max);
 224                 set_extra_mod(var_name, sym, estate);
 225
 226                 tmp_slist = __pop_fake_cur_slist();
 227                 merge_slist(&final_states, tmp_slist);
 228                 free_slist(&tmp_slist);
 229                 handled = 1;
 230         } END_FOR_EACH_PTR(tmp);
 231
 232         FOR_EACH_PTR(final_states, sm) {
 233                 __set_sm(sm);
 234         } END_FOR_EACH_PTR(sm);
 235
 236         free_slist(&final_states);
 237 free:
 238         free_string(var_name);
 239         return handled;
 240 }
 241
 242 static int call_implies_callbacks(int comparison, struct expression *expr, sval_t sval, int left)
 243 {
 244         struct call_back_list *call_backs;
 245         struct fcall_back *tmp;
 246         const char *fn;
 247         struct data_range *value_range;
 248         struct state_list *true_states = NULL;
 249         struct state_list *false_states = NULL;
 250         struct state_list *tmp_slist;
 251         struct sm_state *sm;
 252
 253         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 254                 return 0;
 255         fn = expr->fn->symbol->ident->name;
 256         call_backs = search_callback(func_hash, (char *)expr->fn->symbol->ident->name);
 257         if (!call_backs)
 258                 return 0;
 259         value_range = alloc_range(sval, sval);
 260
 261         /* set true states */
 262         __push_fake_cur_slist();
 263         FOR_EACH_PTR(call_backs, tmp) {
 264                 if (tmp->type != RANGED_CALL)
 265                         continue;
 266                 if (!true_comparison_range_lr(comparison, tmp->range, value_range, left))
 267                         continue;
 268                 (tmp->u.ranged)(fn, expr, NULL, tmp->info);
 269         } END_FOR_EACH_PTR(tmp);
 270         tmp_slist = __pop_fake_cur_slist();
 271         merge_slist(&true_states, tmp_slist);
 272         free_slist(&tmp_slist);
 273
 274         /* set false states */
 275         __push_fake_cur_slist();
 276         FOR_EACH_PTR(call_backs, tmp) {
 277                 if (tmp->type != RANGED_CALL)
 278                         continue;
 279                 if (!false_comparison_range_lr(comparison, tmp->range, value_range, left))
 280                         continue;
 281                 (tmp->u.ranged)(fn, expr, NULL, tmp->info);
 282         } END_FOR_EACH_PTR(tmp);
 283         tmp_slist = __pop_fake_cur_slist();
 284         merge_slist(&false_states, tmp_slist);
 285         free_slist(&tmp_slist);
 286
 287         FOR_EACH_PTR(true_states, sm) {
 288                 __set_true_false_sm(sm, NULL);
 289         } END_FOR_EACH_PTR(sm);
 290         FOR_EACH_PTR(false_states, sm) {
 291                 __set_true_false_sm(NULL, sm);
 292         } END_FOR_EACH_PTR(sm);
 293
 294         free_slist(&true_states);
 295         free_slist(&false_states);
 296         return 1;
 297 }
 298
 299 struct db_callback_info {
 300         int true_side;
 301         int comparison;
 302         struct expression *expr;
 303         struct range_list *rl;
 304         int left;
 305         struct state_list *slist;
 306         struct db_implies_list *callbacks;
 307 };
 308 static struct db_callback_info db_info;
 309 static int db_compare_callback(void *unused, int argc, char **argv, char **azColName)
 310 {
 311         struct range_list *ret_range;
 312         int type, param;
 313         char *key, *value;
 314         struct return_implies_callback *tmp;
 315
 316         if (argc != 5)
 317                 return 0;
 318
 319         parse_value_ranges_type(get_type(db_info.expr), argv[0], &ret_range);
 320         type = atoi(argv[1]);
 321         param = atoi(argv[2]);
 322         key = argv[3];
 323         value = argv[4];
 324
 325         if (db_info.true_side) {
 326                 if (!possibly_true_range_lists_lr(db_info.comparison,
 327                                                   ret_range, db_info.rl,
 328                                                   db_info.left))
 329                         return 0;
 330         } else {
 331                 if (!possibly_false_range_lists_lr(db_info.comparison,
 332                                                   ret_range, db_info.rl,
 333                                                   db_info.left))
 334                         return 0;
 335         }
 336
 337         FOR_EACH_PTR(db_info.callbacks, tmp) {
 338                 if (tmp->type == type)
 339                         tmp->callback(db_info.expr, param, key, value);
 340         } END_FOR_EACH_PTR(tmp);
 341         return 0;
 342 }
 343
 344 void compare_db_return_states_callbacks(int comparison, struct expression *expr, sval_t sval, int left)
 345 {
 346         struct symbol *sym;
 347         static char sql_filter[1024];
 348         struct state_list *true_states;
 349         struct state_list *false_states;
 350         struct sm_state *sm;
 351
 352         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 353                 return;
 354
 355         sym = expr->fn->symbol;
 356         if (!sym)
 357                 return;
 358
 359         if (sym->ctype.modifiers & MOD_STATIC) {
 360                 snprintf(sql_filter, 1024,
 361                          "file = '%s' and function = '%s' and static = '1';",
 362                          get_filename(), sym->ident->name);
 363         } else {
 364                 snprintf(sql_filter, 1024,
 365                          "function = '%s' and static = '0';", sym->ident->name);
 366         }
 367
 368         db_info.comparison = comparison;
 369         db_info.expr = expr;
 370         db_info.rl = alloc_range_list(sval, sval);
 371         db_info.left = left;
 372         db_info.callbacks = db_return_states_list;
 373
 374         db_info.true_side = 1;
 375         __push_fake_cur_slist();
 376         run_sql(db_compare_callback,
 377                 "select return, type, parameter, key, value from return_states where %s",
 378                 sql_filter);
 379         true_states = __pop_fake_cur_slist();
 380
 381         db_info.true_side = 0;
 382         __push_fake_cur_slist();
 383         run_sql(db_compare_callback,
 384                 "select return, type, parameter, key, value from return_states where %s",
 385                 sql_filter);
 386         false_states = __pop_fake_cur_slist();
 387
 388         FOR_EACH_PTR(true_states, sm) {
 389                 __set_true_false_sm(sm, NULL);
 390         } END_FOR_EACH_PTR(sm);
 391         FOR_EACH_PTR(false_states, sm) {
 392                 __set_true_false_sm(NULL, sm);
 393         } END_FOR_EACH_PTR(sm);
 394
 395         free_slist(&true_states);
 396         free_slist(&false_states);
 397 }
 398
 399
 400
 401 void function_comparison(int comparison, struct expression *expr, sval_t sval, int left)
 402 {
 403         if (call_implies_callbacks(comparison, expr, sval, left))
 404                 return;
 405         compare_db_return_states_callbacks(comparison, expr, sval, left);
 406 }
 407
 408 static int prev_return_id;
 409 static int db_assign_return_states_callback(void *unused, int argc, char **argv, char **azColName)
 410 {
 411         struct range_list *ret_range;
 412         int type, param;
 413         char *key, *value;
 414         struct return_implies_callback *tmp;
 415         struct state_list *slist;
 416         int return_id;
 417
 418         if (argc != 6)
 419                 return 0;
 420
 421         return_id = atoi(argv[0]);
 422         parse_value_ranges_type(get_type(db_info.expr->right), argv[1], &ret_range);
 423         if (!ret_range)
 424                 ret_range = whole_range_list(cur_func_return_type());
 425         type = atoi(argv[2]);
 426         param = atoi(argv[3]);
 427         key = argv[4];
 428         value = argv[5];
 429
 430         if (prev_return_id != -1 && return_id != prev_return_id) {
 431                 slist = __pop_fake_cur_slist();
 432                 merge_slist(&db_info.slist, slist);
 433                 __push_fake_cur_slist();
 434         }
 435         prev_return_id = return_id;
 436
 437         FOR_EACH_PTR(db_return_states_list, tmp) {
 438                 if (tmp->type == type)
 439                         tmp->callback(db_info.expr, param, key, value);
 440         } END_FOR_EACH_PTR(tmp);
 441         ret_range = cast_rl(get_type(db_info.expr->left), ret_range);
 442         set_extra_expr_mod(db_info.expr->left, alloc_estate_range_list(ret_range));
 443
 444         return 0;
 445 }
 446
 447 static int db_return_states_assign(struct expression *expr)
 448 {
 449         struct expression *right;
 450         struct symbol *sym;
 451         struct sm_state *sm;
 452         struct state_list *slist;
 453         static char sql_filter[1024];
 454         int handled = 0;
 455
 456         right = strip_expr(expr->right);
 457         if (right->fn->type != EXPR_SYMBOL || !right->fn->symbol)
 458                 return 0;
 459
 460         sym = right->fn->symbol;
 461         if (!sym)
 462                 return 0;
 463
 464         if (sym->ctype.modifiers & MOD_STATIC) {
 465                 snprintf(sql_filter, 1024,
 466                          "file = '%s' and function = '%s' and static = '1';",
 467                          get_filename(), sym->ident->name);
 468         } else {
 469                 snprintf(sql_filter, 1024,
 470                          "function = '%s' and static = '0';", sym->ident->name);
 471         }
 472
 473         prev_return_id = -1;
 474         db_info.expr = expr;
 475         db_info.slist = NULL;
 476         __push_fake_cur_slist();
 477         run_sql(db_assign_return_states_callback,
 478                 "select return_id, return, type, parameter, key, value from return_states where %s",
 479                 sql_filter);
 480         slist = __pop_fake_cur_slist();
 481         merge_slist(&db_info.slist, slist);
 482
 483         FOR_EACH_PTR(db_info.slist, sm) {
 484                 __set_sm(sm);
 485                 handled = 1;
 486         } END_FOR_EACH_PTR(sm);
 487
 488         return handled;
 489 }
 490
 491 static int handle_implied_return(struct expression *expr)
 492 {
 493         struct range_list *rl;
 494
 495         if (!get_implied_return(expr->right, &rl))
 496                 return 0;
 497         rl = cast_rl(get_type(expr->left), rl);
 498         set_extra_expr_mod(expr->left, alloc_estate_range_list(rl));
 499         return 1;
 500 }
 501
 502 static void match_assign_call(struct expression *expr)
 503 {
 504         struct call_back_list *call_backs;
 505         const char *fn;
 506         struct expression *right;
 507         int handled = 0;
 508
 509         right = strip_expr(expr->right);
 510         if (right->fn->type != EXPR_SYMBOL || !right->fn->symbol) {
 511                 set_extra_expr_mod(expr->left, extra_undefined(get_type(expr->left)));
 512                 return;
 513         }
 514         fn = right->fn->symbol->ident->name;
 515
 516         /*
 517          * some of these conflict (they try to set smatch extra twice), so we
 518          * call them in order from least important to most important.
 519          */
 520
 521         call_backs = search_callback(func_hash, (char *)fn);
 522         call_call_backs(call_backs, ASSIGN_CALL, fn, expr);
 523
 524         handled |= db_return_states_assign(expr);
 525         handled |= assign_ranged_funcs(fn, expr, call_backs);
 526         handled |= handle_implied_return(expr);
 527
 528         if (!handled) {
 529                 struct range_list *rl;
 530
 531                 if (!get_implied_range_list(expr->right, &rl))
 532                         rl = whole_range_list(get_type(expr->right));
 533                 rl = cast_rl(get_type(expr->left), rl);
 534                 set_extra_expr_mod(expr->left, alloc_estate_range_list(rl));
 535         }
 536 }
 537
 538 static int db_return_states_callback(void *unused, int argc, char **argv, char **azColName)
 539 {
 540         struct range_list *ret_range;
 541         int type, param;
 542         char *key, *value;
 543         struct return_implies_callback *tmp;
 544         struct state_list *slist;
 545         int return_id;
 546
 547         if (argc != 6)
 548                 return 0;
 549
 550         return_id = atoi(argv[0]);
 551         parse_value_ranges_type(get_type(db_info.expr), argv[1], &ret_range);
 552         type = atoi(argv[2]);
 553         param = atoi(argv[3]);
 554         key = argv[4];
 555         value = argv[5];
 556
 557         if (prev_return_id != -1 && return_id != prev_return_id) {
 558                 slist = __pop_fake_cur_slist();
 559                 merge_slist(&db_info.slist, slist);
 560                 __push_fake_cur_slist();
 561                 __unnullify_path();
 562         }
 563         prev_return_id = return_id;
 564
 565         FOR_EACH_PTR(db_return_states_list, tmp) {
 566                 if (tmp->type == type)
 567                         tmp->callback(db_info.expr, param, key, value);
 568         } END_FOR_EACH_PTR(tmp);
 569
 570         return 0;
 571 }
 572
 573 static void db_return_states(struct expression *expr)
 574 {
 575         struct symbol *sym;
 576         struct sm_state *sm;
 577         struct state_list *slist;
 578         static char sql_filter[1024];
 579
 580         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 581                 return;
 582
 583         sym = expr->fn->symbol;
 584         if (!sym)
 585                 return;
 586
 587         if (sym->ctype.modifiers & MOD_STATIC) {
 588                 snprintf(sql_filter, 1024,
 589                          "file = '%s' and function = '%s' and static = '1';",
 590                          get_filename(), sym->ident->name);
 591         } else {
 592                 snprintf(sql_filter, 1024,
 593                          "function = '%s' and static = '0';", sym->ident->name);
 594         }
 595
 596         prev_return_id = -1;
 597         db_info.expr = expr;
 598         db_info.slist = NULL;
 599         __push_fake_cur_slist();
 600         __unnullify_path();
 601         run_sql(db_return_states_callback,
 602                 "select return_id, return, type, parameter, key, value from return_states where %s",
 603                 sql_filter);
 604         slist = __pop_fake_cur_slist();
 605         merge_slist(&db_info.slist, slist);
 606
 607         FOR_EACH_PTR(db_info.slist, sm) {
 608                 __set_sm(sm);
 609         } END_FOR_EACH_PTR(sm);
 610 }
 611
 612 static int is_assigned_call(struct expression *expr)
 613 {
 614         struct expression *tmp;
 615
 616         FOR_EACH_PTR_REVERSE(big_expression_stack, tmp) {
 617                 if (tmp->type == EXPR_ASSIGNMENT && strip_expr(tmp->right) == expr)
 618                         return 1;
 619                 if (tmp->pos.line < expr->pos.line)
 620                         return 0;
 621         } END_FOR_EACH_PTR_REVERSE(tmp);
 622         return 0;
 623 }
 624
 625 static void db_return_states_call(struct expression *expr)
 626 {
 627         if (is_assigned_call(expr))
 628                 return;
 629         db_return_states(expr);
 630 }
 631
 632 static void match_function_call(struct expression *expr)
 633 {
 634         struct call_back_list *call_backs;
 635
 636         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 637                 return;
 638         call_backs = search_callback(func_hash, (char *)expr->fn->symbol->ident->name);
 639         if (call_backs)
 640                 call_call_backs(call_backs, REGULAR_CALL,
 641                                 expr->fn->symbol->ident->name, expr);
 642         db_return_states_call(expr);
 643 }
 644
 645 static void match_macro_assign(struct expression *expr)
 646 {
 647         struct call_back_list *call_backs;
 648         const char *macro;
 649         struct expression *right;
 650
 651         right = strip_expr(expr->right);
 652         macro = get_macro_name(right->pos);
 653         call_backs = search_callback(func_hash, (char *)macro);
 654         if (!call_backs)
 655                 return;
 656         call_call_backs(call_backs, MACRO_ASSIGN, macro, expr);
 657         call_call_backs(call_backs, MACRO_ASSIGN_EXTRA, macro, expr);
 658 }
 659
 660 int get_implied_return(struct expression *expr, struct range_list **rl)
 661 {
 662         struct call_back_list *call_backs;
 663         struct fcall_back *tmp;
 664         int handled = 0;
 665         char *fn;
 666
 667         *rl = NULL;
 668
 669         expr = strip_expr(expr);
 670         fn = get_variable_from_expr(expr->fn, NULL);
 671         if (!fn)
 672                 goto out;
 673
 674         call_backs = search_callback(func_hash, fn);
 675
 676         FOR_EACH_PTR(call_backs, tmp) {
 677                 if (tmp->type == IMPLIED_RETURN) {
 678                         (tmp->u.implied_return)(expr, tmp->info, rl);
 679                         handled = 1;
 680                 }
 681         } END_FOR_EACH_PTR(tmp);
 682
 683 out:
 684         free_string(fn);
 685         return handled;
 686 }
 687
 688 void create_function_hook_hash(void)
 689 {
 690         func_hash = create_function_hashtable(5000);
 691 }
 692
 693 void register_function_hooks(int id)
 694 {
 695         add_hook(&match_function_call, FUNCTION_CALL_HOOK);
 696         add_hook(&match_assign_call, CALL_ASSIGNMENT_HOOK);
 697         add_hook(&match_macro_assign, MACRO_ASSIGNMENT_HOOK);
 698 }