12166 resync smatch to 0.6.1-rc1-il-3
1 #include "smatch.h"
2 #include "smatch_extra.h"
3
4 DECLARE_ALLOCATOR(sname);
5 __ALLOCATOR(struct expression, "temporary expr", tmp_expression);
6
7 static struct position get_cur_pos(void)
8 {
9 static struct position pos;
10 static struct position none;
11 struct expression *expr;
12 struct statement *stmt;
13
14 expr = last_ptr_list((struct ptr_list *)big_expression_stack);
15 stmt = last_ptr_list((struct ptr_list *)big_statement_stack);
16 if (expr)
17 pos = expr->pos;
18 else if (stmt)
19 pos = stmt->pos;
20 else
21 pos = none;
22 return pos;
23 }
24
25 struct expression *alloc_tmp_expression(struct position pos, int type)
26 {
27 struct expression *expr;
28
29 expr = __alloc_tmp_expression(0);
30 expr->smatch_flags |= Fake;
31 expr->type = type;
32 expr->pos = pos;
33 return expr;
34 }
35
36 void free_tmp_expressions(void)
37 {
38 clear_tmp_expression_alloc();
39 }
40
41 struct expression *zero_expr(void)
42 {
43 struct expression *zero;
44
45 zero = alloc_tmp_expression(get_cur_pos(), EXPR_VALUE);
46 zero->value = 0;
47 zero->ctype = &int_ctype;
48 return zero;
49 }
50
51 struct expression *value_expr(long long val)
52 {
53 struct expression *expr;
54
55 if (!val)
56 return zero_expr();
57
58 expr = alloc_tmp_expression(get_cur_pos(), EXPR_VALUE);
59 expr->value = val;
60 expr->ctype = &llong_ctype;
61 return expr;
62 }
63
64 struct expression *member_expression(struct expression *deref, int op, struct ident *member)
65 {
66 struct expression *expr;
67
68 expr = alloc_tmp_expression(deref->pos, EXPR_DEREF);
69 expr->op = op;
70 expr->deref = deref;
71 expr->member = member;
72 expr->member_offset = -1;
73 return expr;
74 }
75
76 struct expression *preop_expression(struct expression *expr, int op)
77 {
78 struct expression *preop;
79
80 preop = alloc_tmp_expression(expr->pos, EXPR_PREOP);
81 preop->unop = expr;
82 preop->op = op;
83 return preop;
84 }
85
86 struct expression *deref_expression(struct expression *expr)
87 {
88 if (expr->type == EXPR_BINOP)
89 expr = preop_expression(expr, '(');
90 return preop_expression(expr, '*');
91 }
92
93 struct expression *assign_expression(struct expression *left, int op, struct expression *right)
94 {
95 struct expression *expr;
96
97 if (!right)
98 return NULL;
99
100 /* FIXME: make this a tmp expression. */
101 expr = alloc_expression(right->pos, EXPR_ASSIGNMENT);
102 expr->op = op;
103 expr->left = left;
104 expr->right = right;
105 return expr;
106 }
107
108 struct expression *binop_expression(struct expression *left, int op, struct expression *right)
109 {
110 struct expression *expr;
111
112 expr = alloc_tmp_expression(right->pos, EXPR_BINOP);
113 expr->op = op;
114 expr->left = left;
115 expr->right = right;
116 return expr;
117 }
118
119 struct expression *array_element_expression(struct expression *array, struct expression *offset)
120 {
121 struct expression *expr;
122
123 expr = binop_expression(array, '+', offset);
124 return deref_expression(expr);
125 }
126
127 struct expression *symbol_expression(struct symbol *sym)
128 {
129 struct expression *expr;
130
131 expr = alloc_tmp_expression(sym->pos, EXPR_SYMBOL);
132 expr->symbol = sym;
133 expr->symbol_name = sym->ident;
134 return expr;
135 }
136
137 struct expression *compare_expression(struct expression *left, int op, struct expression *right)
138 {
139 struct expression *expr;
140
141 expr = alloc_tmp_expression(get_cur_pos(), EXPR_COMPARE);
142 expr->op = op;
143 expr->left = left;
144 expr->right = right;
145 return expr;
146 }
147
148 struct expression *string_expression(char *str)
149 {
150 struct expression *ret;
151 struct string *string;
152 int len;
153
154 len = strlen(str) + 1;
155 string = (void *)__alloc_sname(4 + len);
156 string->length = len;
157 string->immutable = 0;
158 memcpy(string->data, str, len);
159
160 ret = alloc_tmp_expression(get_cur_pos(), EXPR_STRING);
161 ret->wide = 0;
162 ret->string = string;
163
164 return ret;
165 }
166
167 struct expression *call_expression(struct expression *fn, struct expression_list *args)
168 {
169 struct expression *expr;
170
171 expr = alloc_tmp_expression(fn->pos, EXPR_CALL);
172 expr->fn = fn;
173 expr->args = args;
174
175 return expr;
176 }
177
178 static struct expression *get_expression_from_base_and_str(struct expression *base, const char *addition)
179 {
180 struct expression *ret = NULL;
181 struct token *token, *prev, *end;
182 char *alloc;
183
184 if (addition[0] == '\0')
185 return base;
186
187 alloc = alloc_string_newline(addition);
188
189 token = tokenize_buffer(alloc, strlen(alloc), &end);
190 if (!token)
191 goto free;
192 if (token_type(token) != TOKEN_STREAMBEGIN)
193 goto free;
194 token = token->next;
195
196 ret = base;
197 while (token_type(token) == TOKEN_SPECIAL &&
198 (token->special == SPECIAL_DEREFERENCE || token->special == '.')) {
199 prev = token;
200 token = token->next;
201 if (token_type(token) != TOKEN_IDENT)
202 goto free;
203 switch (prev->special) {
204 case SPECIAL_DEREFERENCE:
205 ret = deref_expression(ret);
206 ret = member_expression(ret, '*', token->ident);
207 break;
208 case '.':
209 ret = member_expression(ret, '.', token->ident);
210 break;
211 default:
212 goto free;
213 }
214 token = token->next;
215 }
216
217 if (token_type(token) != TOKEN_STREAMEND)
218 goto free;
219
220 free:
221 free_string(alloc);
222
223 return ret;
224 }
225
226 struct expression *gen_expression_from_name_sym(const char *name, struct symbol *sym)
227 {
228 struct expression *base;
229 int skip = 0;
230 struct expression *ret;
231
232 if (!name || !sym)
233 return NULL;
234
235 base = symbol_expression(sym);
236 while (name[skip] != '\0' && name[skip] != '.' && name[skip] != '-')
237 skip++;
238
239 ret = get_expression_from_base_and_str(base, name + skip);
240 if (ret) {
241 char *new = expr_to_str(ret);
242
243 /*
244 * FIXME: this sometimes changes "foo->bar.a.b->c" into
245 * "foo->bar.a.b.c". I don't know why... :(
246 *
247 */
248 if (!new || strcmp(name, new) != 0)
249 return NULL;
250 }
251 return ret;
252 }
253
254 struct expression *gen_expression_from_key(struct expression *arg, const char *key)
255 {
256 struct expression *ret;
257 struct token *token, *prev, *end;
258 const char *p = key;
259 char buf[4095];
260 char *alloc;
261 size_t len;
262
263 /* The idea is that we can parse either $0->foo or $->foo */
264 if (key[0] != '$')
265 return NULL;
266 p++;
267 while (*p >= '0' && *p <= '9')
268 p++;
269 len = snprintf(buf, sizeof(buf), "%s\n", p);
270 alloc = alloc_string(buf);
271
272 token = tokenize_buffer(alloc, len, &end);
273 if (!token)
274 return NULL;
275 if (token_type(token) != TOKEN_STREAMBEGIN)
276 return NULL;
277 token = token->next;
278
279 ret = arg;
280 while (token_type(token) == TOKEN_SPECIAL &&
281 (token->special == SPECIAL_DEREFERENCE || token->special == '.')) {
282 prev = token;
283 token = token->next;
284 if (token_type(token) != TOKEN_IDENT)
285 return NULL;
286 ret = deref_expression(ret);
287 ret = member_expression(ret,
288 (prev->special == SPECIAL_DEREFERENCE) ? '*' : '.',
289 token->ident);
290 token = token->next;
291 }
292
293 if (token_type(token) != TOKEN_STREAMEND)
294 return NULL;
295
296 return ret;
297 }
298
299 void expr_set_parent_expr(struct expression *expr, struct expression *parent)
300 {
301 if (!expr)
302 return;
303 if (parent->smatch_flags & Fake)
304 return;
305
306 expr->parent = (unsigned long)parent | 0x1UL;
307 }
308
309 void expr_set_parent_stmt(struct expression *expr, struct statement *parent)
310 {
311 if (!expr)
312 return;
313 expr->parent = (unsigned long)parent;
314 }
315
316 struct expression *expr_get_parent_expr(struct expression *expr)
317 {
318 if (!expr)
319 return NULL;
320 if (!(expr->parent & 0x1UL))
321 return NULL;
322 return (struct expression *)(expr->parent & ~0x1UL);
323 }
324
325 struct statement *expr_get_parent_stmt(struct expression *expr)
326 {
327 if (!expr)
328 return NULL;
329 if (expr->parent & 0x1UL)
330 return NULL;
331 return (struct statement *)expr->parent;
332 }
333
--- EOF ---