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annotate lwasm/pass5.c @ 370:8764142b3192

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Convert internal error/warning handling framework to a new unified system Replace the ad hoc error and warning handling with a new system that codifies the errors with specific codes. This makes it possible in the future for error numbers to be used for testing and other purposes. It also makes sure the error strings themselves are consistent. Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 22 Jun 2015 18:49:38 -0600
parents 697bc543368c
children 58cafa61ab40
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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;
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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 lwasm_reduce_expr(as, cl -> daddr);
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81 if (!exprok(as, cl -> daddr))
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82 cnt++;
0
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83 }
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84
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85 sl = as -> line_head;
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86 while (cnt > 0)
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87 {
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88 ocnt = cnt;
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89
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90 // find an unresolved address
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91 for ( ; sl && exprok(as, sl -> addr) && exprok(as, sl -> daddr); sl = sl -> next)
0
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92 /* do nothing */ ;
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93
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94 // simplify address
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95 for (cl = sl; cl; cl = cl -> next)
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96 {
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97 as -> cl = sl;
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98 lwasm_reduce_expr(as, sl -> addr);
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99
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100 if (exprok(as, cl -> addr))
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101 {
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102 if (0 == --cnt)
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103 return;
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104 }
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105 lwasm_reduce_expr(as, sl -> daddr);
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106 if (exprok(as, cl -> addr))
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107 {
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108 if (0 == --cnt)
0
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109 return;
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110 }
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111 }
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112
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113 if (cnt == ocnt)
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114 break;
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115 }
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116
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117 if (cnt)
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118 {
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119 // we have non-resolved line addresses here
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120 for (cl = sl; cl; cl = cl -> next)
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121 {
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122 if (!exprok(as, cl -> addr))
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123 {
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124 lwasm_register_error(as, cl, E_LINE_ADDRESS);
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125 }
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126 if (!exprok(as, cl -> daddr))
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127 {
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128 lwasm_register_error(as, cl, E_LINED_ADDRESS);
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129 }
0
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130 }
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131 }
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132 }