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365
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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 <config.h>
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23
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24 #include <stdio.h>
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25 #include <string.h>
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26
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27 #include <lw_alloc.h>
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28 #include <lw_string.h>
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29
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30 #include "lwasm.h"
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31 #include "instab.h"
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32
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33 /*
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34 Resolve2 Pass
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35
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36 Force resolution of instruction sizes.
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37
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38 */
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39 void do_pass4(asmstate_t *as)
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40 {
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41 int rc;
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42 int cnt;
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43 line_t *cl, *sl;
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44 struct line_expr_s *le;
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45
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46 // first, count the number of unresolved instructions
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47 for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next)
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48 {
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49 if (cl -> len == -1)
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50 cnt++;
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51 }
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52
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53 sl = as -> line_head;
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54 while (cnt > 0)
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55 {
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56 // find an unresolved instruction
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57 for ( ; sl && sl -> len != -1; sl = sl -> next)
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58 /* do nothing */ ;
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59
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60 // simplify address
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61 as -> cl = sl;
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62 lwasm_reduce_expr(as, sl -> addr);
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63
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64 // simplify each expression
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65 for (le = sl -> exprs; le; le = le -> next)
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66 lwasm_reduce_expr(as, le -> expr);
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67
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68
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69 if (sl -> insn >= 0 && instab[sl -> insn].resolve)
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70 {
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71 (instab[cl -> insn].resolve)(as, sl, 1);
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72 if (sl -> len == -1)
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73 {
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74 lwasm_register_error(as, sl, "Instruction failed to resolve.");
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75 return;
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76 }
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77 }
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78 cnt--;
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79 if (cnt == 0)
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80 return;
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81
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82 do
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83 {
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84 rc = 0;
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85 for (cl = sl; cl; cl = cl -> next)
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86 {
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87 as -> cl = cl;
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88
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89 // simplify address
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90 lwasm_reduce_expr(as, cl -> addr);
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91
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92 // simplify each expression
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93 for (le = cl -> exprs; le; le = le -> next)
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94 lwasm_reduce_expr(as, le -> expr);
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95
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96 if (cl -> len == -1)
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97 {
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98 // try resolving the instruction length
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99 // but don't force resolution
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100 if (cl -> insn >= 0 && instab[cl -> insn].resolve)
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101 {
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102 (instab[cl -> insn].resolve)(as, cl, 0);
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103 if (cl -> len != -1)
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104 {
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105 rc++;
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106 cnt--;
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107 if (cnt == 0)
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108 return;
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109 }
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110 }
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111 }
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112 }
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113 if (as -> errorcount > 0)
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114 return;
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115 } while (rc > 0);
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116 }
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117 }
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