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annotate src/lwasm.c @ 60:309810f39ab7

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Implemented the * and . special symbols
author lost
date Mon, 05 Jan 2009 00:44:38 +0000
parents b1d81800bc91
children c8c772ef5df9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 lwasm.c
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3 Copyright © 2009 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 Contains random functions used by the assembler
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22 */
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23
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24 #define __lwasm_c_seen__
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25
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29
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30 #include "lwasm.h"
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31 #include "util.h"
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32 #include "expr.h"
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33
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34 int debug_level = 0;
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35
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36 int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...)
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37 {
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38 lwasm_error_t *e;
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39 va_list args;
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40 char errbuff[1024];
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41 int r;
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42
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43 if (as -> passnum != pass)
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44 return;
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45
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46 va_start(args, fmt);
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47
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48 e = lwasm_alloc(sizeof(lwasm_error_t));
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49
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50 e -> next = l -> err;
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51 l -> err = e;
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52
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53 as -> errorcount++;
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54
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55 r = vsnprintf(errbuff, 1024, fmt, args);
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56 e -> mess = lwasm_strdup(errbuff);
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57
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58 va_end(args);
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59
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60 return r;
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61 }
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62
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63 void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b)
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64 {
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65 as -> addr += 1;
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66 as -> addr &= 0xffff;
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67
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68 if (as -> passnum == 1)
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69 return;
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70
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71
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72 if (l -> codelen >= l -> codesize)
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73 {
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74 l -> bytes = realloc(l -> bytes, l -> codesize + 16);
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75 l -> codesize += 16;
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76 }
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77 l -> bytes[l -> codelen] = b & 0xff;
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78 l -> codelen += 1;
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79 }
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80
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81 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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82 {
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83 if (o >= 0x100)
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84 lwasm_emit(as, l, o >> 8);
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85 lwasm_emit(as, l, o & 0xff);
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86 }
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87
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88 int lwasm_lookupreg2(const char *reglist, char **str)
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89 {
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90 int rval = 0;
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91
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92 while (*reglist)
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93 {
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94 if (toupper(**str) == *reglist)
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95 {
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96 // first char matches
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97 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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98 break;
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99 if (toupper(*(*str + 1)) == reglist[1])
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100 break;
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101 }
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102 reglist += 2;
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103 rval++;
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104 }
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105 if (!*reglist)
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106 return -1;
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107 if (reglist[1] == ' ')
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108 (*str)++;
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109 else
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110 (*str) += 2;
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111 return rval;
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112 }
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113
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114 int lwasm_lookupreg3(const char *rlist, const char **str)
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115 {
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116 int rval = 0;
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117 int f = 0;
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118 const char *reglist = rlist;
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119
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120 while (*reglist)
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121 {
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122 if (toupper(**str) == *reglist)
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123 {
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124 // first char matches
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125 if (reglist[1] == ' ')
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126 {
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127 f = 1;
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128 break;
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129 }
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130 if (toupper(*(*str + 1)) == reglist[1])
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131 {
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132 // second char matches
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133 if (reglist[2] == ' ')
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134 {
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135 f = 1;
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136 break;
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137 }
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138 if (toupper(*(*str + 2)) == reglist[2])
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139 {
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140 f = 1;
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141 break;
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142 }
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143 }
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144 }
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145 reglist += 3;
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146 rval++;
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147 }
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148 if (f == 0)
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149 return -1;
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150
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151
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152 reglist = rval * 3 + rlist;
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153 if (reglist[1] == ' ')
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154 (*str) += 1;
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155 else if (reglist[2] == ' ')
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156 (*str) += 2;
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157 else
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158 (*str)+=3;
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159 return rval;
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160 }
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161
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162 struct symstateinfo
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163 {
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164 asmstate_t *as;
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165 lwasm_line_t *l;
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166 };
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167
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168 int lwasm_expr_lookup_symbol(char *sym, void *state, int *val)
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169 {
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170 lwasm_symbol_ent_t *se;
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171 struct symstateinfo *st;
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172
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173 st = state;
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174 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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175
60
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176 // check for special symbols first...
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177 if (sym[1] == '\0')
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178 {
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179 switch (sym[0])
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180 {
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181 // current line address
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182 case '*':
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183 case '.':
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184 *val = st -> l -> codeaddr;
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185 return 0;
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186
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187 case '<':
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188 // previous branch point
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189 // not implemented
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190 break;
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191 case '>':
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192 // next branch point
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193 // not implemented
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194 break;
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195 }
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196 }
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197
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198 // look for local symbol first then global symbol
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199 se = lwasm_find_symbol(st -> as, sym, st -> as -> context);
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200 if (!se)
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201 se = lwasm_find_symbol(st -> as, sym, -1);
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202 debug_message(3, "lwasm_expr_lookup_symbol(): got '%p'", se);
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203 if (!se)
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204 return -1;
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205 *val = se -> value;
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206 return 0;
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207 }
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208
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209 lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp)
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210 {
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211 struct symstateinfo st;
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212
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213 st.as = as;
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214 st.l = l;
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215
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216 debug_message(2, "Evaluate expression: %s", inp);
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217
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218 return(lwasm_expr_eval(inp, outp, lwasm_expr_lookup_symbol, &st));
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219 }
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220
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221 int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val)
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222 {
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223 lwasm_expr_stack_t *s;
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224 const char *ep;
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225 int rval;
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226
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227 s = lwasm_evaluate_expr(as, l, *inp, &ep);
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228 if (!s)
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229 {
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230 register_error(as, l, 1, "Bad expression");
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231 *val = 0;
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232 return -1;
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233 }
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234 *inp = (char *)ep;
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235
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236 if (flag & EXPR_PASS1CONST && as -> passnum == 1 && !lwasm_expr_is_constant(s))
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237 {
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238 register_error(as, l, 1, "Illegal incomplete reference (pass 1)");
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239 *val = 0;
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240 lwasm_expr_stack_free(s);
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241 return -1;
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242 }
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243 if (flag & EXPR_PASS2CONST && as -> passnum == 2 && !lwasm_expr_is_constant(s))
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244 {
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245 register_error(as, l, 2, "Incomplete reference (pass 2)");
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246 *val = 0;
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247 lwasm_expr_stack_free(s);
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248 return -1;
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249 }
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250 *val = lwasm_expr_get_value(s);
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251 lwasm_expr_stack_free(s);
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252
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253 if (flag & EXPR_BYTE && as -> passnum == 2 && (*val < -128 || *val > 255))
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254 {
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255 register_error(as, l, 2, "Byte overflow");
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256 *val &= 0xff;
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257 return -1;
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258 }
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259 if (flag & EXPR_BYTE)
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260 {
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261 *val &= 0xff;
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262 }
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263
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264 return 0;
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265 }
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266
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267 void debug_message(int level, const char *fmt, ...)
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268 {
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269 va_list args;
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270
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271 va_start(args, fmt);
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272 if (debug_level >= level)
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273 {
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274 if (level > 0)
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275 fprintf(stderr, "DEBUG %d: ", level);
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276 vfprintf(stderr, fmt, args);
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277 fputc('\n', stderr);
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278 }
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279 va_end(args);
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280 }
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281
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282 int lwasm_next_context(asmstate_t *as)
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283 {
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284 int r;
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285 r = as -> nextcontext;
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286 as -> nextcontext += 1;
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287 debug_message(3, "lwasm_next_context(): %d (%d) pass %d", r, as -> nextcontext, as -> passnum);
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288 return r;
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289 }
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290