4 * Copyright (C) 2006,2008 Dan Carpenter.
6 * Licensed under the Open Software License version 1.1
14 int __smatch_lineno
= 0;
16 static char *filename
;
17 static char *cur_func
;
18 static int line_func_start
;
20 char *get_filename() { return filename
; }
21 char *get_function() { return cur_func
; }
22 int get_lineno() { return __smatch_lineno
; }
23 int get_func_pos() { return __smatch_lineno
- line_func_start
; }
25 static void split_symlist(struct symbol_list
*sym_list
);
26 static void split_expr_list(struct expression_list
*expr_list
);
28 void __split_expr(struct expression
*expr
)
33 // printf("%d Debug expr_type %d\n", get_lineno(), expr->type);
35 __smatch_lineno
= expr
->pos
.line
;
36 __pass_to_client(expr
, EXPR_HOOK
);
41 __pass_to_client(expr
, OP_HOOK
);
42 __split_expr(expr
->unop
);
45 __split_statements(expr
->statement
);
48 __split_whole_condition(expr
);
51 __merge_true_states();
52 __pop_false_only_stack();
60 if (expr
->type
== EXPR_ASSIGNMENT
)
61 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
62 __split_expr(expr
->left
);
63 __split_expr(expr
->right
);
64 if (expr
->type
== EXPR_ASSIGNMENT
)
65 __pass_to_client(expr
, ASSIGNMENT_AFTER_HOOK
);
68 __pass_to_client(expr
, DEREF_HOOK
);
69 __split_expr(expr
->deref
);
72 __split_expr(expr
->base
);
75 __split_expr(expr
->cast_expression
);
78 /* there isn't anything to pass a client from inside a sizeof() */
80 case EXPR_CONDITIONAL
:
82 __split_whole_condition(expr
->conditional
);
83 __split_expr(expr
->cond_true
);
86 __split_expr(expr
->cond_false
);
87 __merge_true_states();
88 __pop_false_only_stack();
91 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
92 __split_expr(expr
->fn
);
93 split_expr_list(expr
->args
);
94 __pass_to_client(expr
, FUNCTION_CALL_AFTER_HOOK
);
96 if (expr
->fn
->type
== EXPR_SYMBOL
&&
97 !strcmp(expr
->fn
->symbol_name
->name
, "panic"))
101 case EXPR_INITIALIZER
:
102 split_expr_list(expr
->expr_list
);
104 case EXPR_IDENTIFIER
:
105 __split_expr(expr
->ident_expression
);
108 __split_expr(expr
->idx_expression
);
111 __split_expr(expr
->init_expr
);
118 static int is_forever_loop(struct statement
*stmt
)
121 struct expression
*expr
;
123 expr
= strip_expr(stmt
->iterator_pre_condition
);
125 expr
= stmt
->iterator_post_condition
;
127 /* this is a for(;;) loop... */
131 if (expr
->type
== EXPR_VALUE
&& expr
->value
== 1) {
139 * Pre Loops are while and for loops.
142 static void handle_pre_loop(struct statement
*stmt
)
144 int once_through
; /* we go through the loop at least once */
146 __split_statements(stmt
->iterator_pre_statement
);
148 once_through
= known_condition_true(stmt
->iterator_pre_condition
);
153 __split_whole_condition(stmt
->iterator_pre_condition
);
155 __split_statements(stmt
->iterator_statement
);
156 if (is_forever_loop(stmt
)) {
157 __pop_false_only_stack();
158 /* forever loops don't have an iterator_post_statement */
160 __pop_false_states();
162 } else if (once_through
) {
164 __split_statements(stmt
->iterator_post_statement
);
165 __pop_false_states();
166 __use_false_only_stack();
170 __split_statements(stmt
->iterator_post_statement
);
171 __merge_false_states();
172 __use_false_only_stack();
178 * Post loops are do {} while();
180 static void handle_post_loop(struct statement
*stmt
)
184 __split_statements(stmt
->iterator_statement
);
185 if (is_forever_loop(stmt
)) {
191 __split_whole_condition(stmt
->iterator_post_condition
);
192 __use_false_states();
195 __pop_false_only_stack();
198 static void print_unreached(struct statement
*stmt
)
202 * GCC insists on a return statement even where it is never
203 * reached. Also BUG() sometimes is a forever loop and
204 * sometimes not so people put code after a BUG(). There
205 * are way to many false positives.
210 if (__path_is_null()) {
212 case STMT_COMPOUND
: /* after a switch before a case stmt */
215 case STMT_DECLARATION
: /* switch(x) { int a; case foo: ... */
218 smatch_msg("unreachable code. %d", stmt
->type
);
223 void __split_statements(struct statement
*stmt
)
228 __smatch_lineno
= stmt
->pos
.line
;
229 print_unreached(stmt
);
230 __pass_to_client(stmt
, STMT_HOOK
);
232 switch (stmt
->type
) {
233 case STMT_DECLARATION
:
234 __pass_declarations_to_client(stmt
->declaration
);
235 split_symlist(stmt
->declaration
);
238 __pass_to_client(stmt
, RETURN_HOOK
);
239 __split_expr(stmt
->ret_value
);
242 case STMT_EXPRESSION
:
243 __split_expr(stmt
->expression
);
245 case STMT_COMPOUND
: {
247 FOR_EACH_PTR(stmt
->stmts
, s
) {
248 __split_statements(s
);
249 } END_FOR_EACH_PTR(s
);
253 __split_whole_condition(stmt
->if_conditional
);
254 __split_statements(stmt
->if_true
);
255 __push_true_states();
256 __use_false_states();
257 __split_statements(stmt
->if_false
);
258 __merge_true_states();
259 __pop_false_only_stack();
262 if (stmt
->iterator_pre_condition
)
263 handle_pre_loop(stmt
);
264 else if (stmt
->iterator_post_condition
)
265 handle_post_loop(stmt
);
267 // these are for(;;) type loops.
268 handle_pre_loop(stmt
);
272 __split_expr(stmt
->switch_expression
);
273 __save_switch_states();
276 __split_statements(stmt
->switch_statement
);
277 if (!__pop_default())
284 if (!stmt
->case_expression
)
286 __split_expr(stmt
->case_expression
);
287 __split_expr(stmt
->case_to
);
288 __split_statements(stmt
->case_statement
);
292 stmt
->label
->type
== SYM_LABEL
&&
293 stmt
->label
->ident
) {
294 __merge_gotos(stmt
->label
->ident
->name
);
296 __split_statements(stmt
->label_statement
);
299 __split_expr(stmt
->goto_expression
);
300 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
301 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
303 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
305 __process_continues();
307 } else if (stmt
->goto_label
&&
308 stmt
->goto_label
->type
== SYM_LABEL
&&
309 stmt
->goto_label
->ident
) {
310 __save_gotos(stmt
->goto_label
->ident
->name
);
317 __split_expr(stmt
->asm_string
);
318 //__split_expr(stmt->asm_outputs);
319 //__split_expr(stmt->asm_inputs);
320 //__split_expr(stmt->asm_clobbers);
325 __split_expr(stmt
->range_expression
);
326 __split_expr(stmt
->range_low
);
327 __split_expr(stmt
->range_high
);
332 static void split_expr_list(struct expression_list
*expr_list
)
334 struct expression
*expr
;
335 FOR_EACH_PTR(expr_list
, expr
) {
337 } END_FOR_EACH_PTR(expr
);
341 static void split_sym(struct symbol
*sym
)
345 if (!(sym
->namespace & NS_SYMBOL
))
348 __pass_to_client(sym
, SYM_HOOK
);
349 __split_statements(sym
->stmt
);
350 __split_expr(sym
->array_size
);
351 split_symlist(sym
->arguments
);
352 split_symlist(sym
->symbol_list
);
353 __split_statements(sym
->inline_stmt
);
354 split_symlist(sym
->inline_symbol_list
);
355 __split_expr(sym
->initializer
);
358 static void split_symlist(struct symbol_list
*sym_list
)
362 FOR_EACH_PTR(sym_list
, sym
) {
364 } END_FOR_EACH_PTR(sym
);
367 static void split_functions(struct symbol_list
*sym_list
)
371 FOR_EACH_PTR(sym_list
, sym
) {
372 struct symbol
*base_type
;
373 base_type
= get_base_type(sym
);
374 if (sym
->type
== SYM_NODE
&& base_type
->type
== SYM_FN
) {
376 line_func_start
= base_type
->stmt
->pos
.line
;
378 cur_func
= sym
->ident
->name
;
379 __smatch_lineno
= sym
->pos
.line
;
380 SM_DEBUG("new function: %s\n", cur_func
);
382 __pass_to_client(sym
, FUNC_DEF_HOOK
);
383 __split_statements(base_type
->stmt
);
384 __pass_to_client(sym
, END_FUNC_HOOK
);
390 __pass_to_client(sym
, BASE_HOOK
);
392 } END_FOR_EACH_PTR(sym
);
393 __pass_to_client_no_data(END_FILE_HOOK
);
396 void smatch (int argc
, char **argv
)
399 struct string_list
*filelist
= NULL
;
400 struct symbol_list
*sym_list
;
403 printf("Usage: smatch [--debug] <filename.c>\n");
406 sparse_initialize(argc
, argv
, &filelist
);
407 FOR_EACH_PTR_NOTAG(filelist
, filename
) {
408 sym_list
= __sparse(filename
);
409 split_functions(sym_list
);
410 } END_FOR_EACH_PTR_NOTAG(filename
);