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view lwlink/expr.h @ 523:1744f2d1a821
Change behaviour of --format=raw; old behaviour kept for --format=raw2
Make the default --format=raw output just ignore BSS flagged sections. If
you put any in the middle of your code, your output file will break. Don't
do dumb things like that.
If you really need the old behaviour, change to --format=raw2
Neither behaviour is really ideal but doing the "right" thing is a boatload
more complicated and is still going to do the wrong thing from time to time.
Most situations will likely load the BSS sections with separate link script
directives anyway or be assembling directly to raw without using the linker.
author | William Astle <lost@l-w.ca> |
---|---|
date | Mon, 24 Jan 2022 13:55:40 -0700 |
parents | 2c24602be78f |
children |
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/* expr.h Copyright © 2009 William Astle This file is part of LWLINK. LWLINK is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Definitions for expression evaluator */ #ifndef __expr_h_seen__ #define __expr_h_seen__ #ifndef __expr_c_seen__ #define __expr_E__ extern #else #define __expr_E__ #endif // term types #define LW_TERM_NONE 0 #define LW_TERM_OPER 1 // an operator #define LW_TERM_INT 2 // 32 bit signed integer #define LW_TERM_SYM 3 // symbol reference // operator types #define LW_OPER_NONE 0 #define LW_OPER_PLUS 1 // + #define LW_OPER_MINUS 2 // - #define LW_OPER_TIMES 3 // * #define LW_OPER_DIVIDE 4 // / #define LW_OPER_MOD 5 // % #define LW_OPER_INTDIV 6 // \ (don't end line with \) #define LW_OPER_BWAND 7 // bitwise AND #define LW_OPER_BWOR 8 // bitwise OR #define LW_OPER_BWXOR 9 // bitwise XOR #define LW_OPER_AND 10 // boolean AND #define LW_OPER_OR 11 // boolean OR #define LW_OPER_NEG 12 // - unary negation (2's complement) #define LW_OPER_COM 13 // ^ unary 1's complement // term structure typedef struct lw_expr_term_s { int term_type; // type of term (see above) char *symbol; // name of a symbol int value; // value of the term (int) or operator number (OPER) } lw_expr_term_t; // type for an expression evaluation stack typedef struct lw_expr_stack_node_s lw_expr_stack_node_t; struct lw_expr_stack_node_s { lw_expr_term_t *term; lw_expr_stack_node_t *prev; lw_expr_stack_node_t *next; }; typedef struct lw_expr_stack_s { lw_expr_stack_node_t *head; lw_expr_stack_node_t *tail; } lw_expr_stack_t; __expr_E__ void lw_expr_term_free(lw_expr_term_t *t); __expr_E__ lw_expr_term_t *lw_expr_term_create_oper(int oper); __expr_E__ lw_expr_term_t *lw_expr_term_create_sym(char *sym, int symtype); __expr_E__ lw_expr_term_t *lw_expr_term_create_int(int val); __expr_E__ lw_expr_term_t *lw_expr_term_dup(lw_expr_term_t *t); __expr_E__ void lw_expr_stack_free(lw_expr_stack_t *s); __expr_E__ lw_expr_stack_t *lw_expr_stack_create(void); __expr_E__ lw_expr_stack_t *lw_expr_stack_dup(lw_expr_stack_t *s); __expr_E__ void lw_expr_stack_push(lw_expr_stack_t *s, lw_expr_term_t *t); __expr_E__ lw_expr_term_t *lw_expr_stack_pop(lw_expr_stack_t *s); // simplify expression __expr_E__ int lw_expr_reval(lw_expr_stack_t *s, lw_expr_stack_t *(*sfunc)(char *sym, int symtype, void *state), void *state); // useful macros // is the expression "simple" (one term)? #define lw_expr_is_simple(s) ((s) -> head == (s) -> tail) // is the expression constant? #define lw_expr_is_constant(s) (lw_expr_is_simple(s) && (!((s) -> head) || (s) -> head -> term -> term_type == LW_TERM_INT)) // get the constant value of an expression or 0 if not constant #define lw_expr_get_value(s) (lw_expr_is_constant(s) ? ((s) -> head ? (s) -> head -> term -> value : 0) : 0) #undef __expr_E__ #endif // __expr_h_seen__