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annotate lwlink/expr.h @ 264:61d1db1dfe2a 2.6
Build manual for release
| author | lost |
|---|---|
| date | Tue, 22 Dec 2009 05:27:32 +0000 |
| parents | 299c5d793aca |
| children |
| rev | line source |
|---|---|
| 116 | 1 /* |
| 2 expr.h | |
| 118 | 3 Copyright © 2009 William Astle |
| 116 | 4 |
| 5 This file is part of LWLINK. | |
| 6 | |
| 7 LWLINK is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 */ | |
| 20 | |
| 21 /* | |
| 22 Definitions for expression evaluator | |
| 23 */ | |
| 24 | |
| 25 #ifndef __expr_h_seen__ | |
| 26 #define __expr_h_seen__ | |
| 27 | |
| 28 #ifndef __expr_c_seen__ | |
| 29 #define __expr_E__ extern | |
| 30 #else | |
| 31 #define __expr_E__ | |
| 32 #endif | |
| 33 | |
| 34 // term types | |
| 35 #define LW_TERM_NONE 0 | |
| 36 #define LW_TERM_OPER 1 // an operator | |
| 37 #define LW_TERM_INT 2 // 32 bit signed integer | |
| 38 #define LW_TERM_SYM 3 // symbol reference | |
| 39 | |
| 40 // operator types | |
| 41 #define LW_OPER_NONE 0 | |
| 42 #define LW_OPER_PLUS 1 // + | |
| 43 #define LW_OPER_MINUS 2 // - | |
| 44 #define LW_OPER_TIMES 3 // * | |
| 45 #define LW_OPER_DIVIDE 4 // / | |
| 46 #define LW_OPER_MOD 5 // % | |
| 47 #define LW_OPER_INTDIV 6 // \ (don't end line with \) | |
| 48 #define LW_OPER_BWAND 7 // bitwise AND | |
| 49 #define LW_OPER_BWOR 8 // bitwise OR | |
| 50 #define LW_OPER_BWXOR 9 // bitwise XOR | |
| 51 #define LW_OPER_AND 10 // boolean AND | |
| 52 #define LW_OPER_OR 11 // boolean OR | |
| 53 #define LW_OPER_NEG 12 // - unary negation (2's complement) | |
| 54 #define LW_OPER_COM 13 // ^ unary 1's complement | |
| 55 | |
| 56 | |
| 57 // term structure | |
| 58 typedef struct lw_expr_term_s | |
| 59 { | |
| 60 int term_type; // type of term (see above) | |
| 61 char *symbol; // name of a symbol | |
| 62 int value; // value of the term (int) or operator number (OPER) | |
| 63 } lw_expr_term_t; | |
| 64 | |
| 65 // type for an expression evaluation stack | |
| 66 typedef struct lw_expr_stack_node_s lw_expr_stack_node_t; | |
| 67 struct lw_expr_stack_node_s | |
| 68 { | |
| 69 lw_expr_term_t *term; | |
| 70 lw_expr_stack_node_t *prev; | |
| 71 lw_expr_stack_node_t *next; | |
| 72 }; | |
| 73 | |
| 74 typedef struct lw_expr_stack_s | |
| 75 { | |
| 76 lw_expr_stack_node_t *head; | |
| 77 lw_expr_stack_node_t *tail; | |
| 78 } lw_expr_stack_t; | |
| 79 | |
| 80 __expr_E__ void lw_expr_term_free(lw_expr_term_t *t); | |
| 81 __expr_E__ lw_expr_term_t *lw_expr_term_create_oper(int oper); | |
| 82 __expr_E__ lw_expr_term_t *lw_expr_term_create_sym(char *sym, int symtype); | |
| 83 __expr_E__ lw_expr_term_t *lw_expr_term_create_int(int val); | |
| 84 __expr_E__ lw_expr_term_t *lw_expr_term_dup(lw_expr_term_t *t); | |
| 85 | |
| 86 __expr_E__ void lw_expr_stack_free(lw_expr_stack_t *s); | |
| 87 __expr_E__ lw_expr_stack_t *lw_expr_stack_create(void); | |
|
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299c5d793aca
Made lwlink smarter about not included unneeded (unreferenced) members of a library file
lost
parents:
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diff
changeset
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88 __expr_E__ lw_expr_stack_t *lw_expr_stack_dup(lw_expr_stack_t *s); |
| 116 | 89 |
| 90 __expr_E__ void lw_expr_stack_push(lw_expr_stack_t *s, lw_expr_term_t *t); | |
| 91 __expr_E__ lw_expr_term_t *lw_expr_stack_pop(lw_expr_stack_t *s); | |
| 92 | |
| 93 // simplify expression | |
| 94 __expr_E__ int lw_expr_reval(lw_expr_stack_t *s, lw_expr_stack_t *(*sfunc)(char *sym, int symtype, void *state), void *state); | |
| 95 | |
| 96 // useful macros | |
| 97 // is the expression "simple" (one term)? | |
| 98 #define lw_expr_is_simple(s) ((s) -> head == (s) -> tail) | |
| 99 | |
| 100 // is the expression constant? | |
| 101 #define lw_expr_is_constant(s) (lw_expr_is_simple(s) && (!((s) -> head) || (s) -> head -> term -> term_type == LW_TERM_INT)) | |
| 102 | |
| 103 // get the constant value of an expression or 0 if not constant | |
| 104 #define lw_expr_get_value(s) (lw_expr_is_constant(s) ? ((s) -> head ? (s) -> head -> term -> value : 0) : 0) | |
| 105 | |
| 106 #undef __expr_E__ | |
| 107 | |
| 108 #endif // __expr_h_seen__ |