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annotate src/parse.c @ 87:41ff4686b46b

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Checkpoint: object format output
author lost
date Sat, 17 Jan 2009 02:59:24 +0000
parents 918be0c02239
children 718998b673ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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36
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1 /*
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2 parse.c
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3 Copyright © 2008 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 Contains the general parser
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23 */
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24
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25 #define __parse_c_seen__
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26
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27 #include <ctype.h>
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28 #include <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 #include "util.h"
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33
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34 // parse a line and despatch to the appropriate handlers for opcodes
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35 int lwasm_parse_line(asmstate_t *as, lwasm_line_t *l)
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36 {
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37 char *p, *p2;
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38 char *opc;
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39 int opnum;
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40 char *sym = NULL;
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41
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42 // if this was a bad op first pass (or otherwise a no-process line)
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43 // ignore it
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44 if (l -> badop)
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45 return;
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46
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47 p = l -> text;
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48
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49 // blank lines are a no brainer
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50 if (!*p)
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51 {
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52 as -> context = lwasm_next_context(as);
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53 return 0;
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54 }
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55
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56 // for output generation later but only on pass 1
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57 // also used by some pseudo ops on pass 2
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58 if (as -> passnum == 1)
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59 l -> codeaddr = as -> addr;
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60
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61 // if it's a comment, return (this doesn't cause a context change)
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62 if (*p == '*' || *p == ';')
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63 return;
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64
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65 // if we start with a non-space character, it's a symbol
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66 if (!isspace(*p))
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67 {
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68 // we have a symbol specified here
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69 // parse it out and record it for later use
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70 for (p2 = p; *p2 && !isspace(*p2); p2++)
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71 /* do nothing */ ;
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72
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73 sym = lwasm_alloc((p2 - p) + 1);
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74 sym[p2 - p] = '\0';
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75 memcpy(sym, p, p2 - p);
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76
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77 p = p2;
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78 }
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79 l -> sym = sym;
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80
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81 // now skip any whitespace to find the opcode
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82 while (*p && isspace(*p))
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83 p++;
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84
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85 // is the line blank?
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86 if (!*p && !sym)
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87 {
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88 // nothing but white space *is* a context break
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89 as -> context = lwasm_next_context(as);
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90 return;
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91 }
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92
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93 // parse the opcode
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94 for (p2 = p; *p2 && !isspace(*p2); p2++)
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95 /* do nothing */ ;
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96
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97 opc = lwasm_alloc((p2 - p) + 1);
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98 memcpy(opc, p, p2 - p);
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99 opc[p2 - p] = '\0';
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100
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101 debug_message(2, "Found operation code: '%s'", opc);
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102
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103 // skip intervening whitespace if present
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104 while (*p2 && isspace(*p2))
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105 p2++;
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106
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107 // look up instruction in insn table
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108 for (opnum = 0; instab[opnum].opcode; opnum++)
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109 {
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110 if (!strcasecmp(instab[opnum].opcode, opc))
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111 break;
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112 }
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113
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114 // if we found no operation, check if we had a comment
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115 // the reason this check is here is to allow for "private"
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116 // operation codes like "*pragma" which will be ignored by
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117 // other assemblers
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118 // also skip empty ops
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119 if (!(instab[opnum].opcode))
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120 {
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121 if (*opc == '*' || *opc == ';' || !*opc)
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122 goto done_line;
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123 }
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124
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125 // now we have the opcode and the symbol, we can decide if we're
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126 // actually going to do anything with this line
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127
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128 // we will NOT call the function if any of the following are true:
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129
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130 // - we are skipping a condition and the operation code is not a conditional
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131 // - we are defining a macro and the operation code is not ENDM
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132
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133 // we will call the function in any other circumstance
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134
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135 // first condition above
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136 if (as -> inmacro && instab[opnum].endm == 0)
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137 {
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138 add_macro_line(as, l -> text);
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139 goto done_line;
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140 }
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141
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142 // second condition above
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143 if (as -> skipcond && instab[opnum].iscond == 0)
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144 goto done_line;
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145
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146 // we've registered the symbol as needed
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147 // now we need to check for a macro call IFF we don't collide with
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148 // an operation code; otherwise, call the operation function
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149 if (instab[opnum].opcode)
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150 {
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151 if (instab[opnum].fn)
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152 {
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153 (instab[opnum].fn)(as, l, &p2, opnum);
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154 }
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155 else
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156 {
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157 // carp about unimplemented operation
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158 register_error(as, l, 1, "Unimplemented operation code: %s", opc);
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159 }
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160 }
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161 else
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162 {
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163 if (expand_macro(as, l, &p2, opc) == 0)
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164 goto done_line;
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165
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166 // carp about an unknown operation code and note that fact for
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167 // pass 2 in case a macro appears later with the same name!
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168 register_error(as, l, 1, "Uknown operation code: %s", opc);
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169 l -> badop = 1;
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170 }
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171
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172 done_line:
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173 if (!(as -> skipcond || as -> inmacro))
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174 {
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175 // register symbol if the operation didn't
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176 if (sym && instab[opnum].setsym == 0)
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177 {
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178 if (as -> passnum == 1)
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179 {
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180 debug_message(1, "Registering symbol '%s' at %04X", sym, l -> codeaddr);
90a5657d5408 Fixed problem with symbols being registered with the address of the NEXT instruction
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181 if (lwasm_register_symbol(as, l, sym, l -> codeaddr, SYMBOL_NORM) < 0)
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182 l -> sym = NULL;
cef25b0088e6 Fixed some problems detected by valgrind and testing
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183 else
cef25b0088e6 Fixed some problems detected by valgrind and testing
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184 l -> addrset = 1;
cef25b0088e6 Fixed some problems detected by valgrind and testing
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185 }
cef25b0088e6 Fixed some problems detected by valgrind and testing
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186 }
cef25b0088e6 Fixed some problems detected by valgrind and testing
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187 }
cef25b0088e6 Fixed some problems detected by valgrind and testing
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188
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918be0c02239 Started adding object target output
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189 l -> sect = as -> csect;
918be0c02239 Started adding object target output
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190
36
99e3b3310bac Added missing parse.c file to repository
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191 lwasm_free(opc);
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2330b88f9600 Added simple output listing
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192 if (sym)
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193 lwasm_free(sym);
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99e3b3310bac Added missing parse.c file to repository
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194 }