nsz Git - cparser/blob - walk_statements.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 "walk_statements.h"
  26
  27
  28 static void walk_expression(expression_t const *const expr,
  29                             statement_callback const callback, void *const env)
  30 {
  31         switch (expr->base.kind) {
  32         case EXPR_STATEMENT:
  33                 walk_statements(expr->statement.statement, callback, env);
  34                 return;
  35
  36         EXPR_BINARY_CASES
  37                 walk_expression(expr->binary.left,  callback, env);
  38                 walk_expression(expr->binary.right, callback, env);
  39                 return;
  40
  41         EXPR_UNARY_CASES_OPTIONAL
  42                 if (expr->unary.value == NULL)
  43                         return;
  44                 /* FALLTHROUGH */
  45         EXPR_UNARY_CASES_MANDATORY
  46                 walk_expression(expr->unary.value, callback, env);
  47                 return;
  48
  49         case EXPR_CALL:
  50                 for (call_argument_t *arg = expr->call.arguments; arg != NULL;
  51                      arg = arg->next) {
  52                         walk_expression(arg->expression, callback, env);
  53                 }
  54                 return;
  55
  56         case EXPR_UNKNOWN:
  57                 panic("unexpected expr kind");
  58
  59         case EXPR_COMPOUND_LITERAL:
  60                 /* TODO... */
  61                 break;
  62
  63         case EXPR_CONDITIONAL:
  64                 walk_expression(expr->conditional.condition,        callback, env);
  65                 /* may be NULL because of gnu extension */
  66                 if (expr->conditional.true_expression != NULL)
  67                         walk_expression(expr->conditional.true_expression,  callback, env);
  68                 walk_expression(expr->conditional.false_expression, callback, env);
  69                 return;
  70
  71         case EXPR_BUILTIN_CONSTANT_P:
  72                 walk_expression(expr->builtin_constant.value, callback, env);
  73                 return;
  74
  75         case EXPR_SELECT:
  76                 walk_expression(expr->select.compound, callback, env);
  77                 return;
  78
  79         case EXPR_ARRAY_ACCESS:
  80                 walk_expression(expr->array_access.array_ref, callback, env);
  81                 walk_expression(expr->array_access.index,     callback, env);
  82                 return;
  83
  84         case EXPR_CLASSIFY_TYPE:
  85                 walk_expression(expr->classify_type.type_expression, callback, env);
  86                 return;
  87
  88         case EXPR_SIZEOF:
  89         case EXPR_ALIGNOF: {
  90                 expression_t *tp_expression = expr->typeprop.tp_expression;
  91                 if (tp_expression != NULL) {
  92                         walk_expression(tp_expression, callback, env);
  93                 }
  94                 return;
  95         }
  96
  97         case EXPR_VA_START:
  98                 walk_expression(expr->va_starte.ap, callback, env);
  99                 return;
 100
 101         case EXPR_VA_ARG:
 102                 walk_expression(expr->va_arge.ap, callback, env);
 103                 return;
 104
 105         case EXPR_VA_COPY:
 106                 walk_expression(expr->va_copye.src, callback, env);
 107                 walk_expression(expr->va_copye.dst, callback, env);
 108                 return;
 109
 110         EXPR_LITERAL_CASES
 111         case EXPR_INVALID:
 112         case EXPR_OFFSETOF:
 113         case EXPR_REFERENCE:
 114         case EXPR_REFERENCE_ENUM_VALUE:
 115         case EXPR_STRING_LITERAL:
 116         case EXPR_WIDE_STRING_LITERAL:
 117         case EXPR_FUNCNAME:
 118         case EXPR_LABEL_ADDRESS:
 119         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 120                 break;
 121         }
 122
 123         /* TODO FIXME: implement all the missing expressions here */
 124 }
 125
 126 static void walk_initializer(const initializer_t  *initializer,
 127                              statement_callback    callback,
 128                                                          void                 *env)
 129 {
 130         switch(initializer->kind) {
 131         case INITIALIZER_VALUE:
 132                 walk_expression(initializer->value.value, callback, env);
 133                 return;
 134         default:
 135                 /* FIXME: should walk initializer hierarchies... */
 136                 break;
 137         }
 138 }
 139
 140 static void walk_declarations(const entity_t*            entity,
 141                               const entity_t*      const last,
 142                               statement_callback   const callback,
 143                               void                *const env)
 144 {
 145         entity_t const *const end = last != NULL ? last->base.next : NULL;
 146         for (; entity != end; entity = entity->base.next) {
 147                 /* we only look at variables */
 148                 if (entity->kind != ENTITY_VARIABLE)
 149                         continue;
 150
 151                 const variable_t    *variable    = &entity->variable;
 152                 const initializer_t *initializer = variable->initializer;
 153                 if (initializer != NULL) {
 154                         walk_initializer(initializer, callback, env);
 155                 }
 156         }
 157 }
 158
 159
 160 void walk_statements(statement_t *const stmt, statement_callback const callback, void *const env)
 161 {
 162         callback(stmt, env);
 163
 164         switch (stmt->kind) {
 165                 case STATEMENT_COMPOUND:
 166                         for (statement_t *s = stmt->compound.statements; s != NULL; s = s->base.next) {
 167                                 walk_statements(s, callback, env);
 168                         }
 169                         return;
 170
 171                 case STATEMENT_FOR:
 172                         walk_declarations(stmt->fors.scope.entities, NULL, callback, env);
 173                         if (stmt->fors.initialisation != NULL)
 174                                 walk_expression(stmt->fors.initialisation, callback, env);
 175                         if (stmt->fors.condition != NULL)
 176                                 walk_expression(stmt->fors.condition, callback, env);
 177                         if (stmt->fors.step != NULL)
 178                                 walk_expression(stmt->fors.step, callback, env);
 179                         walk_statements(stmt->fors.body,           callback, env);
 180                         return;
 181
 182                 case STATEMENT_IF:
 183                         walk_expression(stmt->ifs.condition,      callback, env);
 184                         walk_statements(stmt->ifs.true_statement, callback, env);
 185                         if (stmt->ifs.false_statement != NULL)
 186                                 walk_statements(stmt->ifs.false_statement, callback, env);
 187                         return;
 188
 189                 case STATEMENT_SWITCH:
 190                         walk_expression(stmt->switchs.expression, callback, env);
 191                         walk_statements(stmt->switchs.body,       callback, env);
 192                         return;
 193
 194                 case STATEMENT_LABEL:
 195                         walk_statements(stmt->label.statement, callback, env);
 196                         return;
 197
 198                 case STATEMENT_CASE_LABEL:
 199                         walk_statements(stmt->case_label.statement, callback, env);
 200                         return;
 201
 202                 case STATEMENT_WHILE:
 203                         walk_expression(stmt->whiles.condition, callback, env);
 204                         walk_statements(stmt->whiles.body,      callback, env);
 205                         return;
 206
 207                 case STATEMENT_DO_WHILE:
 208                         walk_statements(stmt->do_while.body,      callback, env);
 209                         walk_expression(stmt->do_while.condition, callback, env);
 210                         return;
 211
 212                 case STATEMENT_EXPRESSION:
 213                         walk_expression(stmt->expression.expression, callback, env);
 214                         return;
 215
 216                 case STATEMENT_RETURN:
 217                         if (stmt->returns.value != NULL)
 218                                 walk_expression(stmt->returns.value, callback, env);
 219                         return;
 220
 221                 case STATEMENT_DECLARATION:
 222                         walk_declarations(stmt->declaration.declarations_begin,
 223                                         stmt->declaration.declarations_end, callback, env);
 224                         return;
 225
 226                 case STATEMENT_MS_TRY:
 227                         walk_statements(stmt->ms_try.try_statement,   callback, env);
 228                         walk_statements(stmt->ms_try.final_statement, callback, env);
 229                         return;
 230
 231                 case STATEMENT_INVALID:
 232                 case STATEMENT_EMPTY:
 233                 case STATEMENT_CONTINUE:
 234                 case STATEMENT_BREAK:
 235                 case STATEMENT_GOTO:
 236                 case STATEMENT_ASM:
 237                 case STATEMENT_LEAVE:
 238                         return;
 239         }
 240
 241         panic("unhandled statement");
 242 }