nsz Git - cparser/blob - walk_statements.c

   1 #include <config.h>
   2
   3 #include "adt/error.h"
   4 #include "ast_t.h"
   5 #include "entity_t.h"
   6 #include "walk_statements.h"
   7
   8
   9 static void walk_expression(expression_t const *const expr,
  10                             statement_callback const callback, void *const env)
  11 {
  12         switch (expr->base.kind) {
  13         case EXPR_STATEMENT:
  14                 walk_statements(expr->statement.statement, callback, env);
  15                 return;
  16
  17         EXPR_BINARY_CASES
  18                 walk_expression(expr->binary.left,  callback, env);
  19                 walk_expression(expr->binary.right, callback, env);
  20                 return;
  21
  22         EXPR_UNARY_CASES_OPTIONAL
  23                 if (expr->unary.value == NULL)
  24                         return;
  25                 /* FALLTHROUGH */
  26         EXPR_UNARY_CASES_MANDATORY
  27                 walk_expression(expr->unary.value, callback, env);
  28                 return;
  29
  30         case EXPR_CALL:
  31                 for (call_argument_t *arg = expr->call.arguments; arg != NULL;
  32                      arg = arg->next) {
  33                         walk_expression(arg->expression, callback, env);
  34                 }
  35                 return;
  36
  37         case EXPR_UNKNOWN:
  38                 panic("unexpected expr kind");
  39
  40         case EXPR_COMPOUND_LITERAL:
  41                 /* TODO... */
  42                 break;
  43
  44         case EXPR_CONDITIONAL:
  45                 walk_expression(expr->conditional.condition,        callback, env);
  46                 /* may be NULL because of gnu extension */
  47                 if (expr->conditional.true_expression != NULL)
  48                         walk_expression(expr->conditional.true_expression,  callback, env);
  49                 walk_expression(expr->conditional.false_expression, callback, env);
  50                 return;
  51
  52         case EXPR_BUILTIN_PREFETCH:
  53                 walk_expression(expr->builtin_prefetch.adr,      callback, env);
  54                 walk_expression(expr->builtin_prefetch.rw,       callback, env);
  55                 walk_expression(expr->builtin_prefetch.locality, callback, env);
  56                 return;
  57
  58         case EXPR_BUILTIN_CONSTANT_P:
  59                 walk_expression(expr->builtin_constant.value, callback, env);
  60                 return;
  61
  62         case EXPR_SELECT:
  63                 walk_expression(expr->select.compound, callback, env);
  64                 return;
  65
  66         case EXPR_ARRAY_ACCESS:
  67                 walk_expression(expr->array_access.array_ref, callback, env);
  68                 walk_expression(expr->array_access.index,     callback, env);
  69                 return;
  70
  71         case EXPR_CLASSIFY_TYPE:
  72                 walk_expression(expr->classify_type.type_expression, callback, env);
  73                 return;
  74
  75         case EXPR_SIZEOF:
  76         case EXPR_ALIGNOF: {
  77                 expression_t *tp_expression = expr->typeprop.tp_expression;
  78                 if (tp_expression != NULL) {
  79                         walk_expression(tp_expression, callback, env);
  80                 }
  81                 return;
  82         }
  83
  84         case EXPR_INVALID:
  85         case EXPR_OFFSETOF:
  86         case EXPR_REFERENCE:
  87         case EXPR_REFERENCE_ENUM_VALUE:
  88         case EXPR_CONST:
  89         case EXPR_CHARACTER_CONSTANT:
  90         case EXPR_WIDE_CHARACTER_CONSTANT:
  91         case EXPR_STRING_LITERAL:
  92         case EXPR_WIDE_STRING_LITERAL:
  93         case EXPR_FUNCNAME:
  94         case EXPR_BUILTIN_SYMBOL:
  95         case EXPR_VA_START:
  96         case EXPR_VA_ARG:
  97         case EXPR_LABEL_ADDRESS:
  98                 break;
  99         }
 100
 101         /* TODO FIXME: implement all the missing expressions here */
 102 }
 103
 104 static void walk_initializer(const initializer_t  *initializer,
 105                              statement_callback    callback,
 106                                                          void                 *env)
 107 {
 108         switch(initializer->kind) {
 109         case INITIALIZER_VALUE:
 110                 walk_expression(initializer->value.value, callback, env);
 111                 return;
 112         default:
 113                 /* FIXME: should walk initializer hierarchies... */
 114                 break;
 115         }
 116 }
 117
 118 static void walk_declarations(const entity_t*            entity,
 119                               const entity_t*      const last,
 120                               statement_callback   const callback,
 121                               void                *const env)
 122 {
 123         for (; entity != NULL; entity = entity->base.next) {
 124                 /* we only look at variables */
 125                 if (entity->kind != ENTITY_VARIABLE)
 126                         continue;
 127
 128                 const variable_t    *variable    = &entity->variable;
 129                 const initializer_t *initializer = variable->initializer;
 130                 if (initializer != NULL) {
 131                         walk_initializer(initializer, callback, env);
 132                 }
 133
 134                 if (entity == last)
 135                         break;
 136         }
 137 }
 138
 139
 140 void walk_statements(statement_t *const stmt, statement_callback const callback, void *const env)
 141 {
 142         callback(stmt, env);
 143
 144         switch (stmt->kind) {
 145                 case STATEMENT_COMPOUND:
 146                         for (statement_t *s = stmt->compound.statements; s != NULL; s = s->base.next) {
 147                                 walk_statements(s, callback, env);
 148                         }
 149                         return;
 150
 151                 case STATEMENT_FOR:
 152                         walk_declarations(stmt->fors.scope.entities, NULL, callback, env);
 153                         if (stmt->fors.initialisation != NULL)
 154                                 walk_expression(stmt->fors.initialisation, callback, env);
 155                         if (stmt->fors.condition != NULL)
 156                                 walk_expression(stmt->fors.condition, callback, env);
 157                         if (stmt->fors.step != NULL)
 158                                 walk_expression(stmt->fors.step, callback, env);
 159                         walk_statements(stmt->fors.body,           callback, env);
 160                         return;
 161
 162                 case STATEMENT_IF:
 163                         walk_expression(stmt->ifs.condition,      callback, env);
 164                         walk_statements(stmt->ifs.true_statement, callback, env);
 165                         if (stmt->ifs.false_statement != NULL)
 166                                 walk_statements(stmt->ifs.false_statement, callback, env);
 167                         return;
 168
 169                 case STATEMENT_SWITCH:
 170                         walk_expression(stmt->switchs.expression, callback, env);
 171                         walk_statements(stmt->switchs.body,       callback, env);
 172                         return;
 173
 174                 case STATEMENT_LABEL:
 175                         walk_statements(stmt->label.statement, callback, env);
 176                         return;
 177
 178                 case STATEMENT_CASE_LABEL:
 179                         walk_statements(stmt->case_label.statement, callback, env);
 180                         return;
 181
 182                 case STATEMENT_WHILE:
 183                         walk_expression(stmt->whiles.condition, callback, env);
 184                         walk_statements(stmt->whiles.body,      callback, env);
 185                         return;
 186
 187                 case STATEMENT_DO_WHILE:
 188                         walk_statements(stmt->do_while.body,      callback, env);
 189                         walk_expression(stmt->do_while.condition, callback, env);
 190                         return;
 191
 192                 case STATEMENT_EXPRESSION:
 193                         walk_expression(stmt->expression.expression, callback, env);
 194                         return;
 195
 196                 case STATEMENT_RETURN:
 197                         if (stmt->returns.value != NULL)
 198                                 walk_expression(stmt->returns.value, callback, env);
 199                         return;
 200
 201                 case STATEMENT_DECLARATION:
 202                         walk_declarations(stmt->declaration.declarations_begin,
 203                                         stmt->declaration.declarations_end, callback, env);
 204                         return;
 205
 206                 case STATEMENT_MS_TRY:
 207                         walk_statements(stmt->ms_try.try_statement,   callback, env);
 208                         walk_statements(stmt->ms_try.final_statement, callback, env);
 209                         return;
 210
 211                 case STATEMENT_LOCAL_LABEL:
 212                 case STATEMENT_INVALID:
 213                 case STATEMENT_EMPTY:
 214                 case STATEMENT_CONTINUE:
 215                 case STATEMENT_BREAK:
 216                 case STATEMENT_GOTO:
 217                 case STATEMENT_ASM:
 218                 case STATEMENT_LEAVE:
 219                         return;
 220         }
 221
 222         panic("unhandled statement");
 223 }