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Added section base and length symbols to lwlink Added the ability for a link script to define section base and section length symbols when linking. These symbols are searched for when an external reference is resolved before looking up any symbols in the various objects being linked. Also documented the new link script directives and added such directives to all default link scripts.
author William Astle <lost@l-w.ca>
date Fri, 10 Aug 2012 23:47:56 -0600
parents 2c24602be78f
children
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1 /*
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2 expr.h
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWLINK.
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6
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7 LWLINK is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 Definitions for expression evaluator
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23 */
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24
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25 #ifndef __expr_h_seen__
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26 #define __expr_h_seen__
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27
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28 #ifndef __expr_c_seen__
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29 #define __expr_E__ extern
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30 #else
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31 #define __expr_E__
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32 #endif
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33
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34 // term types
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35 #define LW_TERM_NONE 0
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36 #define LW_TERM_OPER 1 // an operator
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37 #define LW_TERM_INT 2 // 32 bit signed integer
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38 #define LW_TERM_SYM 3 // symbol reference
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39
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40 // operator types
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41 #define LW_OPER_NONE 0
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42 #define LW_OPER_PLUS 1 // +
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43 #define LW_OPER_MINUS 2 // -
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44 #define LW_OPER_TIMES 3 // *
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45 #define LW_OPER_DIVIDE 4 // /
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46 #define LW_OPER_MOD 5 // %
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47 #define LW_OPER_INTDIV 6 // \ (don't end line with \)
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48 #define LW_OPER_BWAND 7 // bitwise AND
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49 #define LW_OPER_BWOR 8 // bitwise OR
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50 #define LW_OPER_BWXOR 9 // bitwise XOR
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51 #define LW_OPER_AND 10 // boolean AND
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52 #define LW_OPER_OR 11 // boolean OR
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53 #define LW_OPER_NEG 12 // - unary negation (2's complement)
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54 #define LW_OPER_COM 13 // ^ unary 1's complement
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55
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56
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57 // term structure
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58 typedef struct lw_expr_term_s
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59 {
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60 int term_type; // type of term (see above)
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61 char *symbol; // name of a symbol
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62 int value; // value of the term (int) or operator number (OPER)
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63 } lw_expr_term_t;
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64
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65 // type for an expression evaluation stack
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66 typedef struct lw_expr_stack_node_s lw_expr_stack_node_t;
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67 struct lw_expr_stack_node_s
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68 {
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69 lw_expr_term_t *term;
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70 lw_expr_stack_node_t *prev;
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71 lw_expr_stack_node_t *next;
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72 };
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73
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74 typedef struct lw_expr_stack_s
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75 {
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76 lw_expr_stack_node_t *head;
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77 lw_expr_stack_node_t *tail;
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78 } lw_expr_stack_t;
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79
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80 __expr_E__ void lw_expr_term_free(lw_expr_term_t *t);
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81 __expr_E__ lw_expr_term_t *lw_expr_term_create_oper(int oper);
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82 __expr_E__ lw_expr_term_t *lw_expr_term_create_sym(char *sym, int symtype);
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83 __expr_E__ lw_expr_term_t *lw_expr_term_create_int(int val);
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84 __expr_E__ lw_expr_term_t *lw_expr_term_dup(lw_expr_term_t *t);
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85
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86 __expr_E__ void lw_expr_stack_free(lw_expr_stack_t *s);
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87 __expr_E__ lw_expr_stack_t *lw_expr_stack_create(void);
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88 __expr_E__ lw_expr_stack_t *lw_expr_stack_dup(lw_expr_stack_t *s);
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89
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90 __expr_E__ void lw_expr_stack_push(lw_expr_stack_t *s, lw_expr_term_t *t);
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91 __expr_E__ lw_expr_term_t *lw_expr_stack_pop(lw_expr_stack_t *s);
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92
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93 // simplify expression
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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);
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95
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96 // useful macros
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97 // is the expression "simple" (one term)?
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98 #define lw_expr_is_simple(s) ((s) -> head == (s) -> tail)
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99
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100 // is the expression constant?
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101 #define lw_expr_is_constant(s) (lw_expr_is_simple(s) && (!((s) -> head) || (s) -> head -> term -> term_type == LW_TERM_INT))
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102
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103 // get the constant value of an expression or 0 if not constant
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104 #define lw_expr_get_value(s) (lw_expr_is_constant(s) ? ((s) -> head ? (s) -> head -> term -> value : 0) : 0)
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105
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106 #undef __expr_E__
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107
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108 #endif // __expr_h_seen__