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annotate lwasm/pass4.c @ 129:5706712f8a20

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author lost@l-w.ca
date Thu, 11 Aug 2011 22:25:29 -0600
parents 2c24602be78f
children 697bc543368c
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 pass4.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 Resolve2 Pass
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33
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34 Force resolution of instruction sizes.
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35
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36 */
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37 void do_pass4_aux(asmstate_t *as, int force)
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38 {
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39 int rc;
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40 int cnt;
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41 line_t *cl, *sl;
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42 struct line_expr_s *le;
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43
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44 // first, count the number of unresolved instructions
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45 for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next)
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46 {
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47 if (cl -> len == -1)
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48 cnt++;
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49 }
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50
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51 sl = as -> line_head;
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52 while (cnt > 0)
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53 {
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54 // find an unresolved instruction
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55 for ( ; sl && sl -> len != -1; sl = sl -> next)
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56 {
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57 as -> cl = sl;
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58 lwasm_reduce_expr(as, sl -> addr);
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59
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60 // simplify each expression
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61 for (le = sl -> exprs; le; le = le -> next)
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62 lwasm_reduce_expr(as, le -> expr);
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63 }
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64
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65 // simplify address
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66 as -> cl = sl;
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67 lwasm_reduce_expr(as, sl -> addr);
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68
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69 // simplify each expression
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70 for (le = sl -> exprs; le; le = le -> next)
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71 lwasm_reduce_expr(as, le -> expr);
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72
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73
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74 if (sl -> len == -1 && sl -> insn >= 0 && instab[sl -> insn].resolve)
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75 {
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76 (instab[sl -> insn].resolve)(as, sl, 1);
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77 if (force && sl -> len == -1)
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78 {
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79 lwasm_register_error(as, sl, "Instruction failed to resolve.");
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80 return;
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81 }
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82 }
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83 cnt--;
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84 if (cnt == 0)
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85 return;
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86
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87 do
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88 {
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89 rc = 0;
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90 for (cl = sl; cl; cl = cl -> next)
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91 {
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92 as -> cl = cl;
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93
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94 // simplify address
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95 lwasm_reduce_expr(as, cl -> addr);
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96
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97 // simplify each expression
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98 for (le = cl -> exprs; le; le = le -> next)
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99 lwasm_reduce_expr(as, le -> expr);
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100
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101 if (cl -> len == -1)
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102 {
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103 // try resolving the instruction length
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104 // but don't force resolution
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105 if (cl -> insn >= 0 && instab[cl -> insn].resolve)
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106 {
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107 (instab[cl -> insn].resolve)(as, cl, 0);
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108 if (cl -> len != -1)
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109 {
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110 rc++;
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111 cnt--;
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112 if (cnt == 0)
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113 return;
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114 }
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115 }
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116 }
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117 }
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118 if (as -> errorcount > 0)
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119 return;
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120 } while (rc > 0);
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121 }
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122 }
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123
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124 void do_pass4(asmstate_t *as)
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125 {
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126 do_pass4_aux(as, 1);
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127 }