Mercurial > hg > index.cgi
annotate lwasm/pass4.c @ 225:823560a8c251
Prevent infinite loop due to warning directive
Warning directive failed to set the line length to 0 which caused assembly
to hang since warnings are not fatal.
author | William Astle <lost@l-w.ca> |
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date | Sun, 15 Jul 2012 21:19:04 -0600 |
parents | 4503199d56ba |
children | 8beb109dfd69 |
rev | line source |
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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 debug_message(as, 60, "%d unresolved instructions", cnt); |
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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 { |
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59 debug_message(as, 200, "Search line %p", sl); |
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60 as -> cl = sl; |
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61 lwasm_reduce_expr(as, sl -> addr); |
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62 lwasm_reduce_expr(as, sl -> daddr); |
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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 debug_message(as, 200, "Found line %p", sl); |
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70 // simplify address |
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71 as -> cl = sl; |
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72 lwasm_reduce_expr(as, sl -> addr); |
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73 lwasm_reduce_expr(as, sl -> daddr); |
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74 |
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75 // simplify each expression |
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76 for (le = sl -> exprs; le; le = le -> next) |
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77 lwasm_reduce_expr(as, le -> expr); |
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78 |
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79 |
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80 if (sl -> len == -1 && sl -> insn >= 0 && instab[sl -> insn].resolve) |
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81 { |
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82 (instab[sl -> insn].resolve)(as, sl, 1); |
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83 debug_message(as, 200, "Try resolve = %d/%d", sl -> len, sl -> dlen); |
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84 if (force && sl -> len == -1 && sl -> dlen == -1) |
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85 { |
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86 lwasm_register_error(as, sl, "Instruction failed to resolve."); |
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87 return; |
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88 } |
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89 } |
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90 if (sl -> len != -1 && sl -> dlen != -1) |
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91 { |
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92 cnt--; |
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93 if (cnt == 0) |
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94 return; |
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95 |
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96 // this one resolved - try looking for the next one instead |
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97 // of wasting time running through the rest of the lines |
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98 continue; |
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99 } |
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100 |
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101 do |
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102 { |
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103 debug_message(as, 200, "Flatten after..."); |
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104 rc = 0; |
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105 for (cl = sl; cl; cl = cl -> next) |
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106 { |
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107 debug_message(as, 200, "Flatten line %p", cl); |
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108 as -> cl = cl; |
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109 |
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110 // simplify address |
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111 lwasm_reduce_expr(as, cl -> addr); |
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112 lwasm_reduce_expr(as, cl -> daddr); |
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113 // simplify each expression |
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114 for (le = cl -> exprs; le; le = le -> next) |
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115 lwasm_reduce_expr(as, le -> expr); |
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116 |
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117 if (cl -> len == -1) |
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118 { |
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119 // try resolving the instruction length |
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120 // but don't force resolution |
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121 if (cl -> insn >= 0 && instab[cl -> insn].resolve) |
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122 { |
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123 (instab[cl -> insn].resolve)(as, cl, 0); |
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124 if ((cl -> inmod == 0) && cl -> len >= 0 && cl -> dlen >= 0) |
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125 { |
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126 if (cl -> len == 0) |
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127 cl -> len = cl -> dlen; |
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128 else |
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129 cl -> dlen = cl -> len; |
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130 } |
201
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131 debug_message(as, 200, "Flatten resolve returns %d", cl -> len); |
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132 if (cl -> len != -1 && cl -> dlen != -1) |
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133 { |
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134 rc++; |
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135 cnt--; |
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136 if (cnt == 0) |
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137 return; |
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138 } |
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139 } |
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140 } |
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141 } |
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142 if (as -> errorcount > 0) |
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143 return; |
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144 } while (rc > 0); |
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145 } |
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146 } |
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147 |
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148 void do_pass4(asmstate_t *as) |
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149 { |
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150 do_pass4_aux(as, 1); |
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151 } |