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annotate lwasm/pass5.c @ 66:0359d9f1dfca

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Added tag lwtools-4.0 for changeset 05f1a31f8f1e
author lost@l-w.ca
date Fri, 08 Apr 2011 21:38:15 -0600
parents 7317fbe024af
children 697bc543368c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 pass5.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 AssignAddresses Pass
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33
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34 Force resolution of all line addresses
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35
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36 */
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37
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38 static int exprok_aux(lw_expr_t e, void *priv)
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39 {
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40 asmstate_t *as = priv;
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41
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42 if (lw_expr_istype(e, lw_expr_type_int))
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43 return 0;
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44 if (lw_expr_istype(e, lw_expr_type_oper))
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45 return 0;
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46 if (lw_expr_istype(e, lw_expr_type_special) && as -> output_format == OUTPUT_OBJ)
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47 {
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48 int t;
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49 t = lw_expr_specint(e);
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50 if (t == lwasm_expr_secbase)
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51 return 0;
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52 }
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53
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54 return 1;
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55 }
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56
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57 static int exprok(asmstate_t *as, lw_expr_t e)
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58 {
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59 if (lw_expr_testterms(e, exprok_aux, as))
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60 return 0;
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61 return 1;
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62 }
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63
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64 void do_pass5(asmstate_t *as)
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65 {
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66 // int rc;
0
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67 int cnt;
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68 int ocnt;
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69 line_t *cl, *sl;
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70 // struct line_expr_s *le;
0
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71
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72 // first, count the number of non-constant addresses; do
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73 // a reduction first on each one
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74 for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next)
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75 {
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76 as -> cl = cl;
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77 lwasm_reduce_expr(as, cl -> addr);
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78 if (!exprok(as, cl -> addr))
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79 cnt++;
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80 }
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81
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82 sl = as -> line_head;
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83 while (cnt > 0)
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84 {
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85 ocnt = cnt;
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86
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87 // find an unresolved address
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88 for ( ; sl && exprok(as, sl -> addr); sl = sl -> next)
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89 /* do nothing */ ;
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90
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91 // simplify address
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92 for (cl = sl; cl; cl = cl -> next)
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93 {
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94 as -> cl = sl;
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95 lwasm_reduce_expr(as, sl -> addr);
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96
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97 if (exprok(as, cl -> addr))
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98 {
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99 if (0 == --cnt);
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100 return;
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101 }
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102 }
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103
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104 if (cnt == ocnt)
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105 break;
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106 }
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107
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108 if (cnt)
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109 {
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110 // we have non-resolved line addresses here
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111 for (cl = sl; cl; cl = cl -> next)
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112 {
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113 if (!exprok(as, cl -> addr))
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114 {
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115 lwasm_register_error(as, cl, "Cannot resolve line address");
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116 }
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117 }
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118 }
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119 }