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annotate lwasm/pass5.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 697bc543368c
children 8764142b3192
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;
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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, "Cannot resolve 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, "Cannot resolve line data address");
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129 }
0
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130 }
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131 }
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132 }