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_CONSTANT_P:
  53                 walk_expression(expr->builtin_constant.value, callback, env);
  54                 return;
  55
  56         case EXPR_SELECT:
  57                 walk_expression(expr->select.compound, callback, env);
  58                 return;
  59
  60         case EXPR_ARRAY_ACCESS:
  61                 walk_expression(expr->array_access.array_ref, callback, env);
  62                 walk_expression(expr->array_access.index,     callback, env);
  63                 return;
  64
  65         case EXPR_CLASSIFY_TYPE:
  66                 walk_expression(expr->classify_type.type_expression, callback, env);
  67                 return;
  68
  69         case EXPR_SIZEOF:
  70         case EXPR_ALIGNOF: {
  71                 expression_t *tp_expression = expr->typeprop.tp_expression;
  72                 if (tp_expression != NULL) {
  73                         walk_expression(tp_expression, callback, env);
  74                 }
  75                 return;
  76         }
  77
  78         case EXPR_INVALID:
  79         case EXPR_OFFSETOF:
  80         case EXPR_REFERENCE:
  81         case EXPR_REFERENCE_ENUM_VALUE:
  82         case EXPR_CONST:
  83         case EXPR_CHARACTER_CONSTANT:
  84         case EXPR_WIDE_CHARACTER_CONSTANT:
  85         case EXPR_STRING_LITERAL:
  86         case EXPR_WIDE_STRING_LITERAL:
  87         case EXPR_FUNCNAME:
  88         case EXPR_VA_START:
  89         case EXPR_VA_ARG:
  90         case EXPR_LABEL_ADDRESS:
  91         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
  92                 break;
  93         }
  94
  95         /* TODO FIXME: implement all the missing expressions here */
  96 }
  97
  98 static void walk_initializer(const initializer_t  *initializer,
  99                              statement_callback    callback,
 100                                                          void                 *env)
 101 {
 102         switch(initializer->kind) {
 103         case INITIALIZER_VALUE:
 104                 walk_expression(initializer->value.value, callback, env);
 105                 return;
 106         default:
 107                 /* FIXME: should walk initializer hierarchies... */
 108                 break;
 109         }
 110 }
 111
 112 static void walk_declarations(const entity_t*            entity,
 113                               const entity_t*      const last,
 114                               statement_callback   const callback,
 115                               void                *const env)
 116 {
 117         entity_t const *const end = last != NULL ? last->base.next : NULL;
 118         for (; entity != end; entity = entity->base.next) {
 119                 /* we only look at variables */
 120                 if (entity->kind != ENTITY_VARIABLE)
 121                         continue;
 122
 123                 const variable_t    *variable    = &entity->variable;
 124                 const initializer_t *initializer = variable->initializer;
 125                 if (initializer != NULL) {
 126                         walk_initializer(initializer, callback, env);
 127                 }
 128         }
 129 }
 130
 131
 132 void walk_statements(statement_t *const stmt, statement_callback const callback, void *const env)
 133 {
 134         callback(stmt, env);
 135
 136         switch (stmt->kind) {
 137                 case STATEMENT_COMPOUND:
 138                         for (statement_t *s = stmt->compound.statements; s != NULL; s = s->base.next) {
 139                                 walk_statements(s, callback, env);
 140                         }
 141                         return;
 142
 143                 case STATEMENT_FOR:
 144                         walk_declarations(stmt->fors.scope.entities, NULL, callback, env);
 145                         if (stmt->fors.initialisation != NULL)
 146                                 walk_expression(stmt->fors.initialisation, callback, env);
 147                         if (stmt->fors.condition != NULL)
 148                                 walk_expression(stmt->fors.condition, callback, env);
 149                         if (stmt->fors.step != NULL)
 150                                 walk_expression(stmt->fors.step, callback, env);
 151                         walk_statements(stmt->fors.body,           callback, env);
 152                         return;
 153
 154                 case STATEMENT_IF:
 155                         walk_expression(stmt->ifs.condition,      callback, env);
 156                         walk_statements(stmt->ifs.true_statement, callback, env);
 157                         if (stmt->ifs.false_statement != NULL)
 158                                 walk_statements(stmt->ifs.false_statement, callback, env);
 159                         return;
 160
 161                 case STATEMENT_SWITCH:
 162                         walk_expression(stmt->switchs.expression, callback, env);
 163                         walk_statements(stmt->switchs.body,       callback, env);
 164                         return;
 165
 166                 case STATEMENT_LABEL:
 167                         walk_statements(stmt->label.statement, callback, env);
 168                         return;
 169
 170                 case STATEMENT_CASE_LABEL:
 171                         walk_statements(stmt->case_label.statement, callback, env);
 172                         return;
 173
 174                 case STATEMENT_WHILE:
 175                         walk_expression(stmt->whiles.condition, callback, env);
 176                         walk_statements(stmt->whiles.body,      callback, env);
 177                         return;
 178
 179                 case STATEMENT_DO_WHILE:
 180                         walk_statements(stmt->do_while.body,      callback, env);
 181                         walk_expression(stmt->do_while.condition, callback, env);
 182                         return;
 183
 184                 case STATEMENT_EXPRESSION:
 185                         walk_expression(stmt->expression.expression, callback, env);
 186                         return;
 187
 188                 case STATEMENT_RETURN:
 189                         if (stmt->returns.value != NULL)
 190                                 walk_expression(stmt->returns.value, callback, env);
 191                         return;
 192
 193                 case STATEMENT_DECLARATION:
 194                         walk_declarations(stmt->declaration.declarations_begin,
 195                                         stmt->declaration.declarations_end, callback, env);
 196                         return;
 197
 198                 case STATEMENT_MS_TRY:
 199                         walk_statements(stmt->ms_try.try_statement,   callback, env);
 200                         walk_statements(stmt->ms_try.final_statement, callback, env);
 201                         return;
 202
 203                 case STATEMENT_INVALID:
 204                 case STATEMENT_EMPTY:
 205                 case STATEMENT_CONTINUE:
 206                 case STATEMENT_BREAK:
 207                 case STATEMENT_GOTO:
 208                 case STATEMENT_ASM:
 209                 case STATEMENT_LEAVE:
 210                         return;
 211         }
 212
 213         panic("unhandled statement");
 214 }