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annotate lwasm/pass6.c @ 41:c6b8b455d67f

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Fix line number sequence after including a file
author lost@l-w.ca
date Sat, 02 Apr 2011 22:33:39 -0600
parents 2c24602be78f
children 02804b7c051c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 pass6.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <stdio.h>
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23 #include <string.h>
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24
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25 #include <lw_alloc.h>
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26 #include <lw_string.h>
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 /*
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32 Finalize Pass
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33
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34 Reduce all expressions in a final pass.
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35
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36 Observation:
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37
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38 Everything should reduce as far as it is going to in a single pass
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39 because all line addresses are now constant (or section-base offset)
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40 */
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41
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42 static int exprok_aux(lw_expr_t e, void *priv)
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43 {
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44 asmstate_t *as = priv;
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45
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46 if (lw_expr_istype(e, lw_expr_type_int))
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47 return 0;
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48
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49 if (as -> output_format == OUTPUT_OBJ)
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50 {
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51 if (lw_expr_istype(e, lw_expr_type_oper))
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52 return 0;
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53 if (lw_expr_istype(e, lw_expr_type_special) && as -> output_format == OUTPUT_OBJ)
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54 {
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55 int t;
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56 t = lw_expr_specint(e);
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57 if (t == lwasm_expr_secbase || t == lwasm_expr_syment || t == lwasm_expr_import)
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58 return 0;
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59 }
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60 }
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61
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62 return 1;
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63 }
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64
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65 static int exprok(asmstate_t *as, lw_expr_t e)
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66 {
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67 if (lw_expr_testterms(e, exprok_aux, as))
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68 return 0;
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69 return 1;
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70 }
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71
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72
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73 void do_pass6(asmstate_t *as)
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74 {
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75 line_t *cl;
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76 struct line_expr_s *le;
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77
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78 for (cl = as -> line_head; cl; cl = cl -> next)
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79 {
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80 as -> cl = cl;
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81 for (le = cl -> exprs; le; le = le -> next)
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82 {
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83 lwasm_reduce_expr(as, le -> expr);
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84 if (!exprok(as, le -> expr))
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85 {
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86 lwasm_register_error(as, cl, "Invalid expression");
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87 }
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88 }
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89 }
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90 }