constraints: remove debugging and use the stripped() expression
[smatch.git] / expression.h
blob78813602b88f8585c459e9bd94e0c281f5da32fc
1 #ifndef EXPRESSION_H
2 #define EXPRESSION_H
3 /*
4 * sparse/expression.h
6 * Copyright (C) 2003 Transmeta Corp.
7 * 2003 Linus Torvalds
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 * THE SOFTWARE.
27 * Declarations and helper functions for expression parsing.
30 #include "allocate.h"
31 #include "lib.h"
32 #include "symbol.h"
34 struct expression_list;
36 enum expression_type {
37 EXPR_VALUE = 1,
38 EXPR_STRING,
39 EXPR_SYMBOL,
40 EXPR_TYPE,
41 EXPR_BINOP,
42 EXPR_ASSIGNMENT,
43 EXPR_LOGICAL,
44 EXPR_DEREF,
45 EXPR_PREOP,
46 EXPR_POSTOP,
47 EXPR_CAST,
48 EXPR_FORCE_CAST,
49 EXPR_IMPLIED_CAST,
50 EXPR_SIZEOF,
51 EXPR_ALIGNOF,
52 EXPR_PTRSIZEOF,
53 EXPR_CONDITIONAL,
54 EXPR_SELECT, // a "safe" conditional expression
55 EXPR_STATEMENT,
56 EXPR_CALL,
57 EXPR_COMMA,
58 EXPR_COMPARE,
59 EXPR_LABEL,
60 EXPR_INITIALIZER, // initializer list
61 EXPR_IDENTIFIER, // identifier in initializer
62 EXPR_INDEX, // index in initializer
63 EXPR_POS, // position in initializer
64 EXPR_FVALUE,
65 EXPR_SLICE,
66 EXPR_OFFSETOF,
71 * Flags for tracking the promotion of constness related attributes
72 * from subexpressions to their parents.
74 * The flags are not independent as one might imply another.
75 * The implications are as follows:
76 * - CEF_INT, CEF_ENUM and
77 * CEF_CHAR imply CEF_ICE.
79 * Use the CEF_*_SET_MASK and CEF_*_CLEAR_MASK
80 * helper macros defined below to set or clear one of these flags.
82 enum constexpr_flag {
83 CEF_NONE = 0,
85 * A constant in the sense of [6.4.4]:
86 * - Integer constant [6.4.4.1]
87 * - Floating point constant [6.4.4.2]
88 * - Enumeration constant [6.4.4.3]
89 * - Character constant [6.4.4.4]
91 CEF_INT = (1 << 0),
92 CEF_FLOAT = (1 << 1),
93 CEF_ENUM = (1 << 2),
94 CEF_CHAR = (1 << 3),
97 * A constant expression in the sense of [6.6]:
98 * - integer constant expression [6.6(6)]
99 * - arithmetic constant expression [6.6(8)]
100 * - address constant [6.6(9)]
102 CEF_ICE = (1 << 4),
103 CEF_ACE = (1 << 5),
104 CEF_ADDR = (1 << 6),
106 /* integer constant expression => arithmetic constant expression */
107 CEF_SET_ICE = (CEF_ICE | CEF_ACE),
109 /* integer constant => integer constant expression */
110 CEF_SET_INT = (CEF_INT | CEF_SET_ICE),
112 /* floating point constant => arithmetic constant expression */
113 CEF_SET_FLOAT = (CEF_FLOAT | CEF_ACE),
115 /* enumeration constant => integer constant expression */
116 CEF_SET_ENUM = (CEF_ENUM | CEF_SET_ICE),
118 /* character constant => integer constant expression */
119 CEF_SET_CHAR = (CEF_CHAR | CEF_SET_ICE),
122 * Remove any "Constant" [6.4.4] flag, but retain the "constant
123 * expression" [6.6] flags.
125 CEF_CONST_MASK = (CEF_INT | CEF_FLOAT | CEF_CHAR),
128 * not an integer constant expression => neither of integer,
129 * enumeration and character constant
131 CEF_CLR_ICE = (CEF_ICE | CEF_INT | CEF_ENUM | CEF_CHAR),
134 enum {
135 Handled = 1 << 0,
136 Fake = 1 << 1,
137 }; /* for expr->flags */
139 enum {
140 Taint_comma = 1,
141 }; /* for expr->taint */
143 struct expression {
144 enum expression_type type:8;
145 unsigned flags:8;
146 unsigned smatch_flags:16;
147 int op;
148 struct position pos;
149 struct symbol *ctype;
150 unsigned long parent;
151 union {
152 // EXPR_VALUE
153 struct {
154 unsigned long long value;
155 unsigned taint;
158 // EXPR_FVALUE
159 long double fvalue;
161 // EXPR_STRING
162 struct {
163 int wide;
164 struct string *string;
167 // EXPR_UNOP, EXPR_PREOP and EXPR_POSTOP
168 struct /* unop */ {
169 struct expression *unop;
170 unsigned long op_value;
173 // EXPR_SYMBOL, EXPR_TYPE
174 struct /* symbol_arg */ {
175 struct symbol *symbol;
176 struct ident *symbol_name;
179 // EXPR_STATEMENT
180 struct statement *statement;
182 // EXPR_BINOP, EXPR_COMMA, EXPR_COMPARE, EXPR_LOGICAL and EXPR_ASSIGNMENT
183 struct /* binop_arg */ {
184 struct expression *left, *right;
186 // EXPR_DEREF
187 struct /* deref_arg */ {
188 struct expression *deref;
189 struct ident *member;
190 int member_offset;
192 // EXPR_SLICE
193 struct /* slice */ {
194 struct expression *base;
195 unsigned r_bitpos, r_nrbits;
197 // EXPR_CAST and EXPR_SIZEOF
198 struct /* cast_arg */ {
199 struct symbol *cast_type;
200 struct expression *cast_expression;
202 // EXPR_CONDITIONAL
203 // EXPR_SELECT
204 struct /* conditional_expr */ {
205 struct expression *conditional, *cond_true, *cond_false;
207 // EXPR_CALL
208 struct /* call_expr */ {
209 struct expression *fn;
210 struct expression_list *args;
212 // EXPR_LABEL
213 struct /* label_expr */ {
214 struct symbol *label_symbol;
216 // EXPR_INITIALIZER
217 struct expression_list *expr_list;
218 // EXPR_IDENTIFIER
219 struct /* ident_expr */ {
220 int offset;
221 struct ident *expr_ident;
222 struct symbol *field;
223 struct expression *ident_expression;
225 // EXPR_INDEX
226 struct /* index_expr */ {
227 unsigned int idx_from, idx_to;
228 struct expression *idx_expression;
230 // EXPR_POS
231 struct /* initpos_expr */ {
232 unsigned int init_offset, init_nr;
233 struct expression *init_expr;
235 // EXPR_OFFSETOF
236 struct {
237 struct symbol *in;
238 struct expression *down;
239 union {
240 struct ident *ident;
241 struct expression *index;
247 /* Constant expression values */
248 int is_zero_constant(struct expression *);
249 int expr_truth_value(struct expression *expr);
250 long long get_expression_value(struct expression *);
251 long long const_expression_value(struct expression *);
252 long long get_expression_value_silent(struct expression *expr);
254 /* Expression parsing */
255 struct token *parse_expression(struct token *token, struct expression **tree);
256 struct token *conditional_expression(struct token *token, struct expression **tree);
257 struct token *primary_expression(struct token *token, struct expression **tree);
258 struct token *parens_expression(struct token *token, struct expression **expr, const char *where);
259 struct token *assignment_expression(struct token *token, struct expression **tree);
261 extern void evaluate_symbol_list(struct symbol_list *list);
262 extern struct symbol *evaluate_statement(struct statement *stmt);
263 extern struct symbol *evaluate_expression(struct expression *);
265 extern int expand_symbol(struct symbol *);
267 static inline struct expression *alloc_expression(struct position pos, int type)
269 struct expression *expr = __alloc_expression(0);
270 expr->type = type;
271 expr->pos = pos;
272 expr->flags = CEF_NONE;
273 return expr;
276 static inline struct expression *alloc_const_expression(struct position pos, int value)
278 struct expression *expr = __alloc_expression(0);
279 expr->type = EXPR_VALUE;
280 expr->pos = pos;
281 expr->value = value;
282 expr->ctype = &int_ctype;
283 expr->flags = CEF_SET_INT;
284 return expr;
287 /* Type name parsing */
288 struct token *typename(struct token *, struct symbol **, int *);
290 static inline int lookup_type(struct token *token)
292 if (token->pos.type == TOKEN_IDENT) {
293 struct symbol *sym = lookup_symbol(token->ident, NS_SYMBOL | NS_TYPEDEF);
294 return sym && (sym->namespace & NS_TYPEDEF);
296 return 0;
299 /* Statement parsing */
300 struct statement *alloc_statement(struct position pos, int type);
301 struct token *initializer(struct expression **tree, struct token *token);
302 struct token *compound_statement(struct token *, struct statement *);
304 /* The preprocessor calls this 'constant_expression()' */
305 #define constant_expression(token,tree) conditional_expression(token, tree)
307 /* Cast folding of constant values.. */
308 void cast_value(struct expression *expr, struct symbol *newtype,
309 struct expression *old, struct symbol *oldtype);
311 #endif