nsz Git - cparser/blob - walk.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include "adt/error.h"
  23 #include "ast_t.h"
  24 #include "entity_t.h"
  25 #include "type_t.h"
  26 #include "walk.h"
  27 #include <libfirm/adt/pset.h>
  28
  29 typedef struct walk_env_t {
  30         pset *visited_types;
  31         declaration_callback declaration_func;
  32         statement_callback   statement_func;
  33         expression_callback  expression_func;
  34         void *env;
  35 } walk_env_t;
  36
  37 static void walk_expression(expression_t *expr, const walk_env_t *const env);
  38 static void walk_statement(statement_t *stmt, const walk_env_t *env);
  39 static void walk_entity(entity_t *entity, const walk_env_t *env);
  40 static void walk_designator(const designator_t *, const walk_env_t *);
  41 static void walk_initializer(const initializer_t  *, const walk_env_t *);
  42 static void walk_scope(const scope_t *const scope, const walk_env_t *const env);
  43
  44 static void walk_type(type_t *const type, const walk_env_t *const env)
  45 {
  46         if (pset_find_ptr(env->visited_types, type) != NULL)
  47                 return;
  48         pset_insert_ptr(env->visited_types, type);
  49
  50         switch (type->kind) {
  51         case TYPE_ATOMIC:
  52         case TYPE_COMPLEX:
  53         case TYPE_IMAGINARY:
  54         case TYPE_REFERENCE:
  55         case TYPE_ERROR:
  56                 return;
  57         case TYPE_POINTER:
  58                 walk_type(type->pointer.points_to, env);
  59                 return;
  60         case TYPE_ARRAY:
  61                 walk_type(type->array.element_type, env);
  62                 if (type->array.size_expression != NULL)
  63                         walk_expression(type->array.size_expression, env);
  64                 return;
  65         case TYPE_FUNCTION:
  66                 for (function_parameter_t *parameter = type->function.parameters;
  67                      parameter != NULL; parameter = parameter->next) {
  68                         walk_type(parameter->type, env);
  69                 }
  70                 walk_type(type->function.return_type, env);
  71                 return;
  72         case TYPE_TYPEOF:
  73                 walk_expression(type->typeoft.expression, env);
  74                 return;
  75         case TYPE_TYPEDEF:
  76                 walk_entity((entity_t*)type->typedeft.typedefe, env);
  77                 return;
  78         case TYPE_COMPOUND_STRUCT:
  79         case TYPE_COMPOUND_UNION:
  80                 walk_entity((entity_t*)type->compound.compound, env);
  81                 return;
  82         case TYPE_ENUM:
  83                 walk_entity((entity_t*)type->enumt.enume, env);
  84                 return;
  85         }
  86         panic("invalid type found");
  87 }
  88
  89 static void walk_expression(expression_t *const expr,
  90                             const walk_env_t *const env)
  91 {
  92         env->expression_func(expr, env->env);
  93
  94         switch (expr->base.kind) {
  95         case EXPR_STATEMENT:
  96                 walk_statement(expr->statement.statement, env);
  97                 return;
  98
  99         case EXPR_BINARY_CASES:
 100                 walk_expression(expr->binary.left, env);
 101                 walk_expression(expr->binary.right, env);
 102                 return;
 103
 104         case EXPR_UNARY_CASES_OPTIONAL:
 105                 if (expr->unary.value == NULL)
 106                         return;
 107                 /* FALLTHROUGH */
 108         case EXPR_UNARY_CASES_MANDATORY:
 109                 walk_expression(expr->unary.value, env);
 110                 return;
 111
 112         case EXPR_CALL:
 113                 for (call_argument_t *arg = expr->call.arguments; arg != NULL;
 114                      arg = arg->next) {
 115                         walk_expression(arg->expression, env);
 116                 }
 117                 return;
 118
 119         case EXPR_COMPOUND_LITERAL:
 120                 walk_initializer(expr->compound_literal.initializer, env);
 121                 return;
 122
 123         case EXPR_CONDITIONAL:
 124                 walk_expression(expr->conditional.condition, env);
 125                 /* may be NULL because of gnu extension */
 126                 if (expr->conditional.true_expression != NULL)
 127                         walk_expression(expr->conditional.true_expression, env);
 128                 walk_expression(expr->conditional.false_expression, env);
 129                 return;
 130
 131         case EXPR_BUILTIN_CONSTANT_P:
 132                 walk_expression(expr->builtin_constant.value, env);
 133                 return;
 134
 135         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 136                 walk_type(expr->builtin_types_compatible.left, env);
 137                 walk_type(expr->builtin_types_compatible.right, env);
 138                 return;
 139
 140         case EXPR_SELECT:
 141                 walk_expression(expr->select.compound, env);
 142                 return;
 143
 144         case EXPR_ARRAY_ACCESS:
 145                 walk_expression(expr->array_access.array_ref, env);
 146                 walk_expression(expr->array_access.index, env);
 147                 return;
 148
 149         case EXPR_CLASSIFY_TYPE:
 150                 walk_expression(expr->classify_type.type_expression, env);
 151                 return;
 152
 153         case EXPR_SIZEOF:
 154         case EXPR_ALIGNOF: {
 155                 expression_t *tp_expression = expr->typeprop.tp_expression;
 156                 if (tp_expression != NULL) {
 157                         walk_expression(tp_expression, env);
 158                 }
 159                 return;
 160         }
 161
 162         case EXPR_VA_START:
 163                 walk_expression(expr->va_starte.ap, env);
 164                 return;
 165
 166         case EXPR_VA_ARG:
 167                 walk_expression(expr->va_arge.ap, env);
 168                 return;
 169
 170         case EXPR_VA_COPY:
 171                 walk_expression(expr->va_copye.src, env);
 172                 walk_expression(expr->va_copye.dst, env);
 173                 return;
 174
 175         case EXPR_OFFSETOF:
 176                 walk_designator(expr->offsetofe.designator, env);
 177                 return;
 178
 179         case EXPR_LITERAL_CASES:
 180         case EXPR_REFERENCE:
 181         case EXPR_ENUM_CONSTANT:
 182         case EXPR_STRING_LITERAL:
 183         case EXPR_FUNCNAME:
 184         case EXPR_LABEL_ADDRESS:
 185         case EXPR_ERROR:
 186                 return;
 187         }
 188         panic("invalid expr kind");
 189 }
 190
 191 static void walk_designator(const designator_t *designator,
 192                             const walk_env_t *const env)
 193 {
 194         for ( ; designator != NULL; designator = designator->next) {
 195                 if (designator->array_index != NULL)
 196                         walk_expression(designator->array_index, env);
 197         }
 198 }
 199
 200 static void walk_initializer(const initializer_t  *initializer,
 201                              const walk_env_t *const env)
 202 {
 203         switch(initializer->kind) {
 204         case INITIALIZER_VALUE:
 205                 walk_expression(initializer->value.value, env);
 206                 return;
 207         case INITIALIZER_LIST: {
 208                 for (size_t i = 0; i < initializer->list.len; ++i) {
 209                         walk_initializer(initializer->list.initializers[i], env);
 210                 }
 211                 return;
 212         }
 213         case INITIALIZER_DESIGNATOR:
 214                 walk_designator(initializer->designator.designator, env);
 215                 return;
 216         case INITIALIZER_STRING:
 217         case INITIALIZER_WIDE_STRING:
 218                 return;
 219         }
 220 }
 221
 222 static void walk_entity(entity_t *entity, const walk_env_t *const env)
 223 {
 224         env->declaration_func(entity, env->env);
 225
 226         switch (entity->kind) {
 227         case ENTITY_VARIABLE: {
 228                 const variable_t    *variable    = &entity->variable;
 229                 const initializer_t *initializer = variable->initializer;
 230                 walk_type(entity->declaration.type, env);
 231                 if (initializer != NULL) {
 232                         walk_initializer(initializer, env);
 233                 }
 234                 return;
 235         }
 236         case ENTITY_ENUM_VALUE:
 237                 if (entity->enum_value.value != NULL)
 238                         walk_expression(entity->enum_value.value, env);
 239                 return;
 240         case ENTITY_TYPEDEF:
 241                 walk_type(entity->typedefe.type, env);
 242                 return;
 243         case ENTITY_FUNCTION:
 244                 walk_type(entity->declaration.type, env);
 245                 if (entity->function.statement != NULL)
 246                         walk_statement(entity->function.statement, env);
 247                 return;
 248         case ENTITY_COMPOUND_MEMBER:
 249         case ENTITY_PARAMETER:
 250                 walk_type(entity->declaration.type, env);
 251                 return;
 252         case ENTITY_CLASS:
 253         case ENTITY_STRUCT:
 254         case ENTITY_UNION:
 255                 walk_scope(&entity->compound.members, env);
 256                 return;
 257         case ENTITY_NAMESPACE:
 258                 walk_scope(&entity->namespacee.members, env);
 259                 return;
 260         case ENTITY_ENUM:
 261                 for (entity = entity->base.next;
 262                      entity != NULL && entity->kind == ENTITY_ENUM_VALUE;
 263                          entity = entity->base.next) {
 264                         walk_entity(entity, env);
 265                 }
 266                 return;
 267         case ENTITY_LABEL:
 268         case ENTITY_LOCAL_LABEL:
 269                 return;
 270         }
 271         panic("invalid entity found");
 272 }
 273
 274 static void walk_declarations(entity_t*            entity,
 275                               entity_t*      const last,
 276                                                           const walk_env_t    *const env)
 277 {
 278         entity_t const *const end = last != NULL ? last->base.next : NULL;
 279         for (; entity != end; entity = entity->base.next) {
 280                 walk_entity(entity, env);
 281         }
 282 }
 283
 284 static void walk_scope(const scope_t *const scope, const walk_env_t *const env)
 285 {
 286         walk_declarations(scope->entities, NULL, env);
 287 }
 288
 289 static void walk_statement(statement_t *const stmt, const walk_env_t *const env)
 290 {
 291         env->statement_func(stmt, env->env);
 292
 293         switch (stmt->kind) {
 294         case STATEMENT_COMPOUND:
 295                 for (statement_t *s = stmt->compound.statements; s != NULL;
 296                      s = s->base.next) {
 297                         walk_statement(s, env);
 298                 }
 299                 return;
 300
 301         case STATEMENT_FOR:
 302                 walk_declarations(stmt->fors.scope.entities, NULL, env);
 303                 if (stmt->fors.initialisation != NULL)
 304                         walk_expression(stmt->fors.initialisation, env);
 305                 if (stmt->fors.condition != NULL)
 306                         walk_expression(stmt->fors.condition, env);
 307                 if (stmt->fors.step != NULL)
 308                         walk_expression(stmt->fors.step, env);
 309                 walk_statement(stmt->fors.body, env);
 310                 return;
 311
 312         case STATEMENT_IF:
 313                 walk_expression(stmt->ifs.condition, env);
 314                 walk_statement(stmt->ifs.true_statement, env);
 315                 if (stmt->ifs.false_statement != NULL)
 316                         walk_statement(stmt->ifs.false_statement, env);
 317                 return;
 318
 319         case STATEMENT_SWITCH:
 320                 walk_expression(stmt->switchs.expression, env);
 321                 walk_statement(stmt->switchs.body, env);
 322                 return;
 323
 324         case STATEMENT_LABEL:
 325                 walk_statement(stmt->label.statement, env);
 326                 return;
 327
 328         case STATEMENT_CASE_LABEL:
 329                 if (stmt->case_label.expression) {
 330                         walk_expression(stmt->case_label.expression, env);
 331                         if (stmt->case_label.end_range)
 332                                 walk_expression(stmt->case_label.end_range, env);
 333                 }
 334                 walk_statement(stmt->case_label.statement, env);
 335                 return;
 336
 337         case STATEMENT_WHILE:
 338                 walk_expression(stmt->whiles.condition, env);
 339                 walk_statement(stmt->whiles.body, env);
 340                 return;
 341
 342         case STATEMENT_DO_WHILE:
 343                 walk_statement(stmt->do_while.body, env);
 344                 walk_expression(stmt->do_while.condition, env);
 345                 return;
 346
 347         case STATEMENT_EXPRESSION:
 348                 walk_expression(stmt->expression.expression, env);
 349                 return;
 350
 351         case STATEMENT_RETURN:
 352                 if (stmt->returns.value != NULL)
 353                         walk_expression(stmt->returns.value, env);
 354                 return;
 355
 356         case STATEMENT_DECLARATION:
 357                 walk_declarations(stmt->declaration.declarations_begin,
 358                                 stmt->declaration.declarations_end, env);
 359                 return;
 360
 361         case STATEMENT_MS_TRY:
 362                 walk_statement(stmt->ms_try.try_statement, env);
 363                 walk_statement(stmt->ms_try.final_statement, env);
 364                 return;
 365
 366         case STATEMENT_COMPUTED_GOTO:
 367                 walk_expression(stmt->computed_goto.expression, env);
 368                 return;
 369
 370         case STATEMENT_ERROR:
 371         case STATEMENT_EMPTY:
 372         case STATEMENT_CONTINUE:
 373         case STATEMENT_BREAK:
 374         case STATEMENT_ASM:
 375         case STATEMENT_GOTO:
 376         case STATEMENT_LEAVE:
 377                 return;
 378         }
 379
 380         panic("unhandled statement");
 381 }
 382
 383 static void null_declaration_func(entity_t *entity, void *env)
 384 {
 385         (void) entity;
 386         (void) env;
 387 }
 388
 389 static void null_statement_func(statement_t *statement, void *env)
 390 {
 391         (void) statement;
 392         (void) env;
 393 }
 394
 395 static void null_expression_func(expression_t *expression, void *env)
 396 {
 397         (void) expression;
 398         (void) env;
 399 }
 400
 401 void walk_translation_unit(translation_unit_t *unit,
 402                            declaration_callback declaration_func,
 403                                                    statement_callback statement_func,
 404                                                    expression_callback expression_func, void *env)
 405 {
 406         walk_env_t walk_env = {
 407                 pset_new_ptr_default(),
 408                 declaration_func != NULL ? declaration_func : null_declaration_func,
 409                 statement_func != NULL ? statement_func : null_statement_func,
 410                 expression_func != NULL ? expression_func : null_expression_func,
 411                 env
 412         };
 413         walk_scope(&unit->scope, &walk_env);
 414         del_pset(walk_env.visited_types);
 415 }
 416
 417 void walk_statements(statement_t *statement, statement_callback func, void *env)
 418 {
 419         walk_env_t walk_env
 420                 = { pset_new_ptr_default(),
 421                     null_declaration_func, func, null_expression_func, env };
 422         walk_statement(statement, &walk_env);
 423         del_pset(walk_env.visited_types);
 424 }