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annotate src/lwasm.c @ 52:b9856da2674a

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Added file inclusion
author lost
date Sun, 04 Jan 2009 20:16:38 +0000
parents 4bb7b723e5b7
children 8e32696380f3
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1 /*
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2 lwasm.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 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
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67 if (as -> passnum == 1)
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68 return;
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69
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70
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71 if (l -> codelen >= l -> codesize)
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72 {
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73 l -> bytes = realloc(l -> bytes, l -> codesize + 16);
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74 l -> codesize += 16;
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75 }
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76 l -> bytes[l -> codelen] = b & 0xff;
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77 l -> codelen += 1;
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78 }
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79
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80 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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81 {
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82 if (o >= 0x100)
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83 lwasm_emit(as, l, o >> 8);
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84 lwasm_emit(as, l, o & 0xff);
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85 }
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86
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87 int lwasm_lookupreg2(const char *reglist, char **str)
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88 {
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89 int rval = 0;
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90
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91 while (*reglist)
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92 {
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93 if (toupper(**str) == *reglist)
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94 {
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95 // first char matches
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96 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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97 break;
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98 if (toupper(*(*str + 1)) == reglist[1])
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99 break;
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100 }
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101 reglist += 2;
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102 rval++;
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103 }
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104 if (!*reglist)
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105 return -1;
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106 if (reglist[1] == ' ')
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107 (*str)++;
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108 else
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109 (*str) += 2;
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110 return rval;
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111 }
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112
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113 int lwasm_lookupreg3(const char *rlist, const char **str)
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114 {
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115 int rval = 0;
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116 int f = 0;
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117 const char *reglist = rlist;
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118
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119 while (*reglist)
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120 {
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121 if (toupper(**str) == *reglist)
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122 {
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123 // first char matches
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124 if (reglist[1] == ' ')
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125 {
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126 f = 1;
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127 break;
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128 }
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129 if (toupper(*(*str + 1)) == reglist[1])
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130 {
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131 // second char matches
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132 if (reglist[2] == ' ')
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133 {
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134 f = 1;
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135 break;
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136 }
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137 if (toupper(*(*str + 2)) == reglist[2])
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138 {
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139 f = 1;
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140 break;
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141 }
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142 }
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143 }
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144 reglist += 3;
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145 rval++;
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146 }
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147 if (f == 0)
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148 return -1;
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149
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150
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151 reglist = rval * 3 + rlist;
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152 if (reglist[1] == ' ')
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153 (*str) += 1;
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154 else if (reglist[2] == ' ')
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155 (*str) += 2;
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156 else
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157 (*str)+=3;
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158 return rval;
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159 }
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160
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161 struct symstateinfo
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162 {
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163 asmstate_t *as;
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164 lwasm_line_t *l;
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165 };
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166
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167 int lwasm_expr_lookup_symbol(char *sym, void *state, int *val)
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168 {
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169 lwasm_symbol_ent_t *se;
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170 struct symstateinfo *st;
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171
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172 st = state;
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173 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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174
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175 // look for local symbol first then global symbol
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176 se = lwasm_find_symbol(st -> as, sym, st -> as -> context);
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177 if (!se)
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178 se = lwasm_find_symbol(st -> as, sym, -1);
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179 debug_message(3, "lwasm_expr_lookup_symbol(): got '%p'", se);
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180 if (!se)
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181 return -1;
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182 *val = se -> value;
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183 return 0;
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184 }
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185
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186 lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp)
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187 {
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188 struct symstateinfo st;
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189
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190 st.as = as;
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191 st.l = l;
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192
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193 debug_message(2, "Evaluate expression: %s", inp);
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194
37
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195 return(lwasm_expr_eval(inp, outp, lwasm_expr_lookup_symbol, &st));
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196 }
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197
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198 void debug_message(int level, const char *fmt, ...)
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199 {
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200 va_list args;
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201
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202 va_start(args, fmt);
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203 if (debug_level >= level)
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204 {
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205 if (level > 0)
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206 fprintf(stderr, "DEBUG %d: ", level);
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207 vfprintf(stderr, fmt, args);
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208 fputc('\n', stderr);
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209 }
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210 va_end(args);
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211 }