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         case TYPE_INVALID:
  86                 break;
  87         }
  88         panic("invalid type found");
  89 }
  90
  91 static void walk_expression(expression_t *const expr,
  92                             const walk_env_t *const env)
  93 {
  94         env->expression_func(expr, env->env);
  95
  96         switch (expr->base.kind) {
  97         case EXPR_STATEMENT:
  98                 walk_statement(expr->statement.statement, env);
  99                 return;
 100
 101         EXPR_BINARY_CASES
 102                 walk_expression(expr->binary.left, env);
 103                 walk_expression(expr->binary.right, env);
 104                 return;
 105
 106         EXPR_UNARY_CASES_OPTIONAL
 107                 if (expr->unary.value == NULL)
 108                         return;
 109                 /* FALLTHROUGH */
 110         EXPR_UNARY_CASES_MANDATORY
 111                 walk_expression(expr->unary.value, env);
 112                 return;
 113
 114         case EXPR_CALL:
 115                 for (call_argument_t *arg = expr->call.arguments; arg != NULL;
 116                      arg = arg->next) {
 117                         walk_expression(arg->expression, env);
 118                 }
 119                 return;
 120
 121         case EXPR_COMPOUND_LITERAL:
 122                 walk_initializer(expr->compound_literal.initializer, env);
 123                 return;
 124
 125         case EXPR_CONDITIONAL:
 126                 walk_expression(expr->conditional.condition, env);
 127                 /* may be NULL because of gnu extension */
 128                 if (expr->conditional.true_expression != NULL)
 129                         walk_expression(expr->conditional.true_expression, env);
 130                 walk_expression(expr->conditional.false_expression, env);
 131                 return;
 132
 133         case EXPR_BUILTIN_CONSTANT_P:
 134                 walk_expression(expr->builtin_constant.value, env);
 135                 return;
 136
 137         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 138                 walk_type(expr->builtin_types_compatible.left, env);
 139                 walk_type(expr->builtin_types_compatible.right, env);
 140                 return;
 141
 142         case EXPR_SELECT:
 143                 walk_expression(expr->select.compound, env);
 144                 return;
 145
 146         case EXPR_ARRAY_ACCESS:
 147                 walk_expression(expr->array_access.array_ref, env);
 148                 walk_expression(expr->array_access.index, env);
 149                 return;
 150
 151         case EXPR_CLASSIFY_TYPE:
 152                 walk_expression(expr->classify_type.type_expression, env);
 153                 return;
 154
 155         case EXPR_SIZEOF:
 156         case EXPR_ALIGNOF: {
 157                 expression_t *tp_expression = expr->typeprop.tp_expression;
 158                 if (tp_expression != NULL) {
 159                         walk_expression(tp_expression, env);
 160                 }
 161                 return;
 162         }
 163
 164         case EXPR_VA_START:
 165                 walk_expression(expr->va_starte.ap, env);
 166                 return;
 167
 168         case EXPR_VA_ARG:
 169                 walk_expression(expr->va_arge.ap, env);
 170                 return;
 171
 172         case EXPR_VA_COPY:
 173                 walk_expression(expr->va_copye.src, env);
 174                 walk_expression(expr->va_copye.dst, env);
 175                 return;
 176
 177         case EXPR_OFFSETOF:
 178                 walk_designator(expr->offsetofe.designator, env);
 179                 return;
 180
 181         EXPR_LITERAL_CASES
 182         case EXPR_REFERENCE:
 183         case EXPR_REFERENCE_ENUM_VALUE:
 184         case EXPR_STRING_LITERAL:
 185         case EXPR_WIDE_STRING_LITERAL:
 186         case EXPR_FUNCNAME:
 187         case EXPR_LABEL_ADDRESS:
 188                 return;
 189         case EXPR_INVALID:
 190                 break;
 191         }
 192         panic("invalid expr kind");
 193 }
 194
 195 static void walk_designator(const designator_t *designator,
 196                             const walk_env_t *const env)
 197 {
 198         for ( ; designator != NULL; designator = designator->next) {
 199                 if (designator->array_index != NULL)
 200                         walk_expression(designator->array_index, env);
 201         }
 202 }
 203
 204 static void walk_initializer(const initializer_t  *initializer,
 205                              const walk_env_t *const env)
 206 {
 207         switch(initializer->kind) {
 208         case INITIALIZER_VALUE:
 209                 walk_expression(initializer->value.value, env);
 210                 return;
 211         case INITIALIZER_LIST: {
 212                 for (size_t i = 0; i < initializer->list.len; ++i) {
 213                         walk_initializer(initializer->list.initializers[i], env);
 214                 }
 215                 return;
 216         }
 217         case INITIALIZER_DESIGNATOR:
 218                 walk_designator(initializer->designator.designator, env);
 219                 return;
 220         case INITIALIZER_STRING:
 221         case INITIALIZER_WIDE_STRING:
 222                 return;
 223         }
 224 }
 225
 226 static void walk_entity(entity_t *entity, const walk_env_t *const env)
 227 {
 228         env->declaration_func(entity, env->env);
 229
 230         switch (entity->kind) {
 231         case ENTITY_VARIABLE: {
 232                 const variable_t    *variable    = &entity->variable;
 233                 const initializer_t *initializer = variable->initializer;
 234                 walk_type(entity->declaration.type, env);
 235                 if (initializer != NULL) {
 236                         walk_initializer(initializer, env);
 237                 }
 238                 return;
 239         }
 240         case ENTITY_ENUM_VALUE:
 241                 if (entity->enum_value.value != NULL)
 242                         walk_expression(entity->enum_value.value, env);
 243                 return;
 244         case ENTITY_TYPEDEF:
 245                 walk_type(entity->typedefe.type, env);
 246                 return;
 247         case ENTITY_FUNCTION:
 248                 walk_type(entity->declaration.type, env);
 249                 if (entity->function.statement != NULL)
 250                         walk_statement(entity->function.statement, env);
 251                 return;
 252         case ENTITY_COMPOUND_MEMBER:
 253         case ENTITY_PARAMETER:
 254                 walk_type(entity->declaration.type, env);
 255                 return;
 256         case ENTITY_CLASS:
 257         case ENTITY_STRUCT:
 258         case ENTITY_UNION:
 259                 walk_scope(&entity->compound.members, env);
 260                 return;
 261         case ENTITY_NAMESPACE:
 262                 walk_scope(&entity->namespacee.members, env);
 263                 return;
 264         case ENTITY_ENUM:
 265                 for (entity = entity->base.next;
 266                      entity != NULL && entity->kind == ENTITY_ENUM_VALUE;
 267                          entity = entity->base.next) {
 268                         walk_entity(entity, env);
 269                 }
 270                 return;
 271         case ENTITY_LABEL:
 272         case ENTITY_LOCAL_LABEL:
 273                 return;
 274         case ENTITY_INVALID:
 275                 break;
 276         }
 277         panic("invalid entity found");
 278 }
 279
 280 static void walk_declarations(entity_t*            entity,
 281                               entity_t*      const last,
 282                                                           const walk_env_t    *const env)
 283 {
 284         entity_t const *const end = last != NULL ? last->base.next : NULL;
 285         for (; entity != end; entity = entity->base.next) {
 286                 walk_entity(entity, env);
 287         }
 288 }
 289
 290 static void walk_scope(const scope_t *const scope, const walk_env_t *const env)
 291 {
 292         walk_declarations(scope->entities, NULL, env);
 293 }
 294
 295 static void walk_statement(statement_t *const stmt, const walk_env_t *const env)
 296 {
 297         env->statement_func(stmt, env->env);
 298
 299         switch (stmt->kind) {
 300         case STATEMENT_COMPOUND:
 301                 for (statement_t *s = stmt->compound.statements; s != NULL;
 302                      s = s->base.next) {
 303                         walk_statement(s, env);
 304                 }
 305                 return;
 306
 307         case STATEMENT_FOR:
 308                 walk_declarations(stmt->fors.scope.entities, NULL, env);
 309                 if (stmt->fors.initialisation != NULL)
 310                         walk_expression(stmt->fors.initialisation, env);
 311                 if (stmt->fors.condition != NULL)
 312                         walk_expression(stmt->fors.condition, env);
 313                 if (stmt->fors.step != NULL)
 314                         walk_expression(stmt->fors.step, env);
 315                 walk_statement(stmt->fors.body, env);
 316                 return;
 317
 318         case STATEMENT_IF:
 319                 walk_expression(stmt->ifs.condition, env);
 320                 walk_statement(stmt->ifs.true_statement, env);
 321                 if (stmt->ifs.false_statement != NULL)
 322                         walk_statement(stmt->ifs.false_statement, env);
 323                 return;
 324
 325         case STATEMENT_SWITCH:
 326                 walk_expression(stmt->switchs.expression, env);
 327                 walk_statement(stmt->switchs.body, env);
 328                 return;
 329
 330         case STATEMENT_LABEL:
 331                 walk_statement(stmt->label.statement, env);
 332                 return;
 333
 334         case STATEMENT_CASE_LABEL:
 335                 walk_statement(stmt->case_label.statement, env);
 336                 return;
 337
 338         case STATEMENT_WHILE:
 339                 walk_expression(stmt->whiles.condition, env);
 340                 walk_statement(stmt->whiles.body, env);
 341                 return;
 342
 343         case STATEMENT_DO_WHILE:
 344                 walk_statement(stmt->do_while.body, env);
 345                 walk_expression(stmt->do_while.condition, env);
 346                 return;
 347
 348         case STATEMENT_EXPRESSION:
 349                 walk_expression(stmt->expression.expression, env);
 350                 return;
 351
 352         case STATEMENT_RETURN:
 353                 if (stmt->returns.value != NULL)
 354                         walk_expression(stmt->returns.value, env);
 355                 return;
 356
 357         case STATEMENT_DECLARATION:
 358                 walk_declarations(stmt->declaration.declarations_begin,
 359                                 stmt->declaration.declarations_end, env);
 360                 return;
 361
 362         case STATEMENT_MS_TRY:
 363                 walk_statement(stmt->ms_try.try_statement, env);
 364                 walk_statement(stmt->ms_try.final_statement, env);
 365                 return;
 366
 367         case STATEMENT_INVALID:
 368         case STATEMENT_EMPTY:
 369         case STATEMENT_CONTINUE:
 370         case STATEMENT_BREAK:
 371         case STATEMENT_GOTO:
 372         case STATEMENT_ASM:
 373         case STATEMENT_LEAVE:
 374                 return;
 375         }
 376
 377         panic("unhandled statement");
 378 }
 379
 380 static void null_declaration_func(entity_t *entity, void *env)
 381 {
 382         (void) entity;
 383         (void) env;
 384 }
 385
 386 static void null_statement_func(statement_t *statement, void *env)
 387 {
 388         (void) statement;
 389         (void) env;
 390 }
 391
 392 static void null_expression_func(expression_t *expression, void *env)
 393 {
 394         (void) expression;
 395         (void) env;
 396 }
 397
 398 void walk_translation_unit(translation_unit_t *unit,
 399                            declaration_callback declaration_func,
 400                                                    statement_callback statement_func,
 401                                                    expression_callback expression_func, void *env)
 402 {
 403         walk_env_t walk_env = {
 404                 pset_new_ptr_default(),
 405                 declaration_func != NULL ? declaration_func : null_declaration_func,
 406                 statement_func != NULL ? statement_func : null_statement_func,
 407                 expression_func != NULL ? expression_func : null_expression_func,
 408                 env
 409         };
 410         walk_scope(&unit->scope, &walk_env);
 411         del_pset(walk_env.visited_types);
 412 }
 413
 414 void walk_statements(statement_t *statement, statement_callback func, void *env)
 415 {
 416         walk_env_t walk_env
 417                 = { pset_new_ptr_default(),
 418                     null_declaration_func, func, null_expression_func, env };
 419         walk_statement(statement, &walk_env);
 420         del_pset(walk_env.visited_types);
 421 }