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11506 smatch resync
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--- old/usr/src/tools/smatch/src/expression.h
+++ new/usr/src/tools/smatch/src/expression.h
1 1 #ifndef EXPRESSION_H
2 2 #define EXPRESSION_H
3 3 /*
4 4 * sparse/expression.h
5 5 *
6 6 * Copyright (C) 2003 Transmeta Corp.
7 7 * 2003 Linus Torvalds
8 8 *
9 9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 10 * of this software and associated documentation files (the "Software"), to deal
11 11 * in the Software without restriction, including without limitation the rights
12 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 13 * copies of the Software, and to permit persons to whom the Software is
14 14 * furnished to do so, subject to the following conditions:
15 15 *
16 16 * The above copyright notice and this permission notice shall be included in
17 17 * all copies or substantial portions of the Software.
18 18 *
19 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 25 * THE SOFTWARE.
26 26 *
27 27 * Declarations and helper functions for expression parsing.
28 28 */
29 29
30 30 #include "allocate.h"
31 31 #include "lib.h"
32 32 #include "symbol.h"
33 33
34 34 struct expression_list;
35 35
36 36 enum expression_type {
37 37 EXPR_VALUE = 1,
38 38 EXPR_STRING,
39 39 EXPR_SYMBOL,
40 40 EXPR_TYPE,
41 41 EXPR_BINOP,
42 42 EXPR_ASSIGNMENT,
43 43 EXPR_LOGICAL,
44 44 EXPR_DEREF,
45 45 EXPR_PREOP,
46 46 EXPR_POSTOP,
47 47 EXPR_CAST,
48 48 EXPR_FORCE_CAST,
49 49 EXPR_IMPLIED_CAST,
50 50 EXPR_SIZEOF,
51 51 EXPR_ALIGNOF,
52 52 EXPR_PTRSIZEOF,
53 53 EXPR_CONDITIONAL,
54 54 EXPR_SELECT, // a "safe" conditional expression
55 55 EXPR_STATEMENT,
56 56 EXPR_CALL,
57 57 EXPR_COMMA,
58 58 EXPR_COMPARE,
59 59 EXPR_LABEL,
60 60 EXPR_INITIALIZER, // initializer list
61 61 EXPR_IDENTIFIER, // identifier in initializer
62 62 EXPR_INDEX, // index in initializer
63 63 EXPR_POS, // position in initializer
64 64 EXPR_FVALUE,
65 65 EXPR_SLICE,
66 66 EXPR_OFFSETOF,
67 67 };
68 68
69 69
70 70 /*
71 71 * Flags for tracking the promotion of constness related attributes
72 72 * from subexpressions to their parents.
73 73 *
74 74 * The flags are not independent as one might imply another.
75 75 * The implications are as follows:
76 76 * - CEF_INT, CEF_ENUM and
77 77 * CEF_CHAR imply CEF_ICE.
78 78 *
79 79 * Use the CEF_*_SET_MASK and CEF_*_CLEAR_MASK
80 80 * helper macros defined below to set or clear one of these flags.
81 81 */
82 82 enum constexpr_flag {
83 83 CEF_NONE = 0,
84 84 /*
85 85 * A constant in the sense of [6.4.4]:
86 86 * - Integer constant [6.4.4.1]
87 87 * - Floating point constant [6.4.4.2]
88 88 * - Enumeration constant [6.4.4.3]
89 89 * - Character constant [6.4.4.4]
90 90 */
91 91 CEF_INT = (1 << 0),
92 92 CEF_FLOAT = (1 << 1),
93 93 CEF_ENUM = (1 << 2),
94 94 CEF_CHAR = (1 << 3),
95 95
96 96 /*
97 97 * A constant expression in the sense of [6.6]:
98 98 * - integer constant expression [6.6(6)]
99 99 * - arithmetic constant expression [6.6(8)]
100 100 * - address constant [6.6(9)]
101 101 */
102 102 CEF_ICE = (1 << 4),
103 103 CEF_ACE = (1 << 5),
104 104 CEF_ADDR = (1 << 6),
105 105
106 106 /* integer constant expression => arithmetic constant expression */
107 107 CEF_SET_ICE = (CEF_ICE | CEF_ACE),
108 108
109 109 /* integer constant => integer constant expression */
110 110 CEF_SET_INT = (CEF_INT | CEF_SET_ICE),
111 111
112 112 /* floating point constant => arithmetic constant expression */
113 113 CEF_SET_FLOAT = (CEF_FLOAT | CEF_ACE),
114 114
115 115 /* enumeration constant => integer constant expression */
116 116 CEF_SET_ENUM = (CEF_ENUM | CEF_SET_ICE),
117 117
118 118 /* character constant => integer constant expression */
119 119 CEF_SET_CHAR = (CEF_CHAR | CEF_SET_ICE),
120 120
121 121 /*
122 122 * Remove any "Constant" [6.4.4] flag, but retain the "constant
123 123 * expression" [6.6] flags.
124 124 */
125 125 CEF_CONST_MASK = (CEF_INT | CEF_FLOAT | CEF_CHAR),
126 126
127 127 /*
128 128 * not an integer constant expression => neither of integer,
129 129 * enumeration and character constant
130 130 */
131 131 CEF_CLR_ICE = (CEF_ICE | CEF_INT | CEF_ENUM | CEF_CHAR),
132 132 };
133 133
134 134 enum {
135 135 Handled = 1 << 0,
136 136 Fake = 1 << 1,
137 137 }; /* for expr->flags */
138 138
139 139 enum {
140 140 Taint_comma = 1,
141 141 }; /* for expr->taint */
142 142
143 143 struct expression {
144 144 enum expression_type type:8;
145 145 unsigned flags:8;
146 146 unsigned smatch_flags:16;
147 147 int op;
148 148 struct position pos;
149 149 struct symbol *ctype;
150 150 unsigned long parent;
151 151 union {
152 152 // EXPR_VALUE
153 153 struct {
154 154 unsigned long long value;
155 155 unsigned taint;
156 156 };
157 157
158 158 // EXPR_FVALUE
159 159 long double fvalue;
160 160
161 161 // EXPR_STRING
162 162 struct {
163 163 int wide;
164 164 struct string *string;
165 165 };
166 166
167 167 // EXPR_UNOP, EXPR_PREOP and EXPR_POSTOP
168 168 struct /* unop */ {
169 169 struct expression *unop;
170 170 unsigned long op_value;
171 171 };
172 172
173 173 // EXPR_SYMBOL, EXPR_TYPE
174 174 struct /* symbol_arg */ {
175 175 struct symbol *symbol;
176 176 struct ident *symbol_name;
177 177 };
178 178
179 179 // EXPR_STATEMENT
180 180 struct statement *statement;
181 181
182 182 // EXPR_BINOP, EXPR_COMMA, EXPR_COMPARE, EXPR_LOGICAL and EXPR_ASSIGNMENT
183 183 struct /* binop_arg */ {
184 184 struct expression *left, *right;
185 185 };
186 186 // EXPR_DEREF
187 187 struct /* deref_arg */ {
188 188 struct expression *deref;
189 189 struct ident *member;
190 190 int member_offset;
191 191 };
192 192 // EXPR_SLICE
193 193 struct /* slice */ {
194 194 struct expression *base;
195 195 unsigned r_bitpos, r_nrbits;
196 196 };
197 197 // EXPR_CAST and EXPR_SIZEOF
198 198 struct /* cast_arg */ {
199 199 struct symbol *cast_type;
200 200 struct expression *cast_expression;
201 201 };
202 202 // EXPR_CONDITIONAL
203 203 // EXPR_SELECT
204 204 struct /* conditional_expr */ {
205 205 struct expression *conditional, *cond_true, *cond_false;
206 206 };
207 207 // EXPR_CALL
208 208 struct /* call_expr */ {
209 209 struct expression *fn;
210 210 struct expression_list *args;
211 211 };
212 212 // EXPR_LABEL
213 213 struct /* label_expr */ {
214 214 struct symbol *label_symbol;
215 215 };
216 216 // EXPR_INITIALIZER
217 217 struct expression_list *expr_list;
218 218 // EXPR_IDENTIFIER
219 219 struct /* ident_expr */ {
220 220 int offset;
221 221 struct ident *expr_ident;
222 222 struct symbol *field;
223 223 struct expression *ident_expression;
224 224 };
225 225 // EXPR_INDEX
226 226 struct /* index_expr */ {
227 227 unsigned int idx_from, idx_to;
228 228 struct expression *idx_expression;
229 229 };
230 230 // EXPR_POS
231 231 struct /* initpos_expr */ {
232 232 unsigned int init_offset, init_nr;
233 233 struct expression *init_expr;
234 234 };
235 235 // EXPR_OFFSETOF
236 236 struct {
237 237 struct symbol *in;
238 238 struct expression *down;
239 239 union {
240 240 struct ident *ident;
241 241 struct expression *index;
242 242 };
243 243 };
244 244 };
245 245 };
246 246
247 247 /* Constant expression values */
248 248 int is_zero_constant(struct expression *);
249 249 int expr_truth_value(struct expression *expr);
250 250 long long get_expression_value(struct expression *);
251 251 long long const_expression_value(struct expression *);
252 252 long long get_expression_value_silent(struct expression *expr);
253 253
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254 254 /* Expression parsing */
255 255 struct token *parse_expression(struct token *token, struct expression **tree);
256 256 struct token *conditional_expression(struct token *token, struct expression **tree);
257 257 struct token *primary_expression(struct token *token, struct expression **tree);
258 258 struct token *parens_expression(struct token *token, struct expression **expr, const char *where);
259 259 struct token *assignment_expression(struct token *token, struct expression **tree);
260 260
261 261 extern void evaluate_symbol_list(struct symbol_list *list);
262 262 extern struct symbol *evaluate_statement(struct statement *stmt);
263 263 extern struct symbol *evaluate_expression(struct expression *);
264 +struct symbol *find_identifier(struct ident *ident, struct symbol_list *_list, int *offset);
264 265
265 266 extern int expand_symbol(struct symbol *);
266 267
267 268 static inline struct expression *alloc_expression(struct position pos, int type)
268 269 {
269 270 struct expression *expr = __alloc_expression(0);
270 271 expr->type = type;
271 272 expr->pos = pos;
272 273 expr->flags = CEF_NONE;
273 274 return expr;
274 275 }
275 276
276 277 static inline struct expression *alloc_const_expression(struct position pos, int value)
277 278 {
278 279 struct expression *expr = __alloc_expression(0);
279 280 expr->type = EXPR_VALUE;
280 281 expr->pos = pos;
281 282 expr->value = value;
282 283 expr->ctype = &int_ctype;
283 284 expr->flags = CEF_SET_INT;
284 285 return expr;
285 286 }
286 287
287 288 /* Type name parsing */
288 289 struct token *typename(struct token *, struct symbol **, int *);
289 290
290 291 static inline int lookup_type(struct token *token)
291 292 {
292 293 if (token->pos.type == TOKEN_IDENT) {
293 294 struct symbol *sym = lookup_symbol(token->ident, NS_SYMBOL | NS_TYPEDEF);
294 295 return sym && (sym->namespace & NS_TYPEDEF);
295 296 }
296 297 return 0;
297 298 }
298 299
299 300 /* Statement parsing */
300 301 struct statement *alloc_statement(struct position pos, int type);
301 302 struct token *initializer(struct expression **tree, struct token *token);
302 303 struct token *compound_statement(struct token *, struct statement *);
303 304
304 305 /* The preprocessor calls this 'constant_expression()' */
305 306 #define constant_expression(token,tree) conditional_expression(token, tree)
306 307
307 308 /* Cast folding of constant values.. */
308 309 void cast_value(struct expression *expr, struct symbol *newtype,
309 310 struct expression *old, struct symbol *oldtype);
310 311
311 312 #endif
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