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annotate src/lwasm.c @ 74:c8c772ef5df9

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Checkpointing object target implementation
author lost
date Thu, 08 Jan 2009 01:18:40 +0000
parents 309810f39ab7
children 2fe5fd7d65a3
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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 -> outformat == OUTPUT_OBJ && !(as -> csect))
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69 {
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70 register_error(as, l, 1, "Output not allowed outside sections with obj target");
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71 return;
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72 }
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73 if (as -> outformat == OUTPUT_OBJ && as -> csect -> flags & SECTION_BSS)
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74 {
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75 register_error(as, l, 1, "Output not allowed inside BSS sections");
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76 return;
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77 }
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78 if (as -> passnum == 1)
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79 return;
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80
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81
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82 if (l -> codelen >= l -> codesize)
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83 {
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84 l -> bytes = realloc(l -> bytes, l -> codesize + 16);
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85 l -> codesize += 16;
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86 }
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87 l -> bytes[l -> codelen] = b & 0xff;
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88 l -> codelen += 1;
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89 }
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90
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91 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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92 {
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93 if (o >= 0x100)
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94 lwasm_emit(as, l, o >> 8);
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95 lwasm_emit(as, l, o & 0xff);
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96 }
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97
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98 int lwasm_lookupreg2(const char *reglist, char **str)
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99 {
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100 int rval = 0;
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101
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102 while (*reglist)
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103 {
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104 if (toupper(**str) == *reglist)
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105 {
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106 // first char matches
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107 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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108 break;
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109 if (toupper(*(*str + 1)) == reglist[1])
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110 break;
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111 }
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112 reglist += 2;
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113 rval++;
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114 }
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115 if (!*reglist)
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116 return -1;
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117 if (reglist[1] == ' ')
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118 (*str)++;
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119 else
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120 (*str) += 2;
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121 return rval;
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122 }
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123
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124 int lwasm_lookupreg3(const char *rlist, const char **str)
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125 {
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126 int rval = 0;
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127 int f = 0;
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128 const char *reglist = rlist;
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129
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130 while (*reglist)
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131 {
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132 if (toupper(**str) == *reglist)
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133 {
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134 // first char matches
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135 if (reglist[1] == ' ')
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136 {
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137 f = 1;
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138 break;
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139 }
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140 if (toupper(*(*str + 1)) == reglist[1])
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141 {
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142 // second char matches
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143 if (reglist[2] == ' ')
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144 {
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145 f = 1;
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146 break;
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147 }
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148 if (toupper(*(*str + 2)) == reglist[2])
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149 {
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150 f = 1;
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151 break;
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152 }
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153 }
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154 }
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155 reglist += 3;
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156 rval++;
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157 }
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158 if (f == 0)
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159 return -1;
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160
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161
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162 reglist = rval * 3 + rlist;
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163 if (reglist[1] == ' ')
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164 (*str) += 1;
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165 else if (reglist[2] == ' ')
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166 (*str) += 2;
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167 else
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168 (*str)+=3;
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169 return rval;
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170 }
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171
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172 struct symstateinfo
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173 {
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174 asmstate_t *as;
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175 lwasm_line_t *l;
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176 };
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177
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178 int lwasm_expr_lookup_symbol(char *sym, void *state, int *val)
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179 {
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180 lwasm_symbol_ent_t *se;
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181 struct symstateinfo *st;
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182
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183 st = state;
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184 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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185
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186 // check for special symbols first...
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187 if (sym[1] == '\0')
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188 {
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189 switch (sym[0])
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190 {
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191 // current line address
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192 case '*':
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193 case '.':
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194 *val = st -> l -> codeaddr;
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195 return 0;
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196
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197 case '<':
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198 // previous branch point
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199 // not implemented
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200 break;
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201 case '>':
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202 // next branch point
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203 // not implemented
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204 break;
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205 }
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206 }
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207
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208 // look for local symbol first then global symbol
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209 se = lwasm_find_symbol(st -> as, sym, st -> as -> context);
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210 if (!se)
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211 se = lwasm_find_symbol(st -> as, sym, -1);
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212 debug_message(3, "lwasm_expr_lookup_symbol(): got '%p'", se);
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213 if (!se)
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214 return -1;
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215 *val = se -> value;
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216 return 0;
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217 }
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218
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219 lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp)
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220 {
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221 struct symstateinfo st;
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222
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223 st.as = as;
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224 st.l = l;
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225
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226 debug_message(2, "Evaluate expression: %s", inp);
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227
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228 return(lwasm_expr_eval(inp, outp, lwasm_expr_lookup_symbol, &st));
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229 }
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230
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231 int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val)
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232 {
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233 lwasm_expr_stack_t *s;
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234 const char *ep;
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235 int rval;
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236
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237 s = lwasm_evaluate_expr(as, l, *inp, &ep);
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238 if (!s)
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239 {
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240 register_error(as, l, 1, "Bad expression");
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241 *val = 0;
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242 return -1;
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243 }
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244 *inp = (char *)ep;
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245
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246 if (flag & EXPR_PASS1CONST && as -> passnum == 1 && !lwasm_expr_is_constant(s))
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247 {
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248 register_error(as, l, 1, "Illegal incomplete reference (pass 1)");
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249 *val = 0;
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250 lwasm_expr_stack_free(s);
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251 return -1;
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252 }
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253 if (flag & EXPR_PASS2CONST && as -> passnum == 2 && !lwasm_expr_is_constant(s))
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254 {
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255 register_error(as, l, 2, "Incomplete reference (pass 2)");
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256 *val = 0;
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257 lwasm_expr_stack_free(s);
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258 return -1;
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259 }
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260 *val = lwasm_expr_get_value(s);
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261 lwasm_expr_stack_free(s);
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262
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263 if (flag & EXPR_BYTE && as -> passnum == 2 && (*val < -128 || *val > 255))
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264 {
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265 register_error(as, l, 2, "Byte overflow");
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266 *val &= 0xff;
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267 return -1;
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268 }
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269 if (flag & EXPR_BYTE)
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270 {
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271 *val &= 0xff;
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272 }
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273
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274 return 0;
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275 }
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276
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277 void debug_message(int level, const char *fmt, ...)
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278 {
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279 va_list args;
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280
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281 va_start(args, fmt);
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282 if (debug_level >= level)
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283 {
39
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284 if (level > 0)
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285 fprintf(stderr, "DEBUG %d: ", level);
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286 vfprintf(stderr, fmt, args);
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287 fputc('\n', stderr);
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288 }
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289 va_end(args);
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290 }
57
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291
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292 int lwasm_next_context(asmstate_t *as)
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293 {
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294 int r;
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295 r = as -> nextcontext;
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296 as -> nextcontext += 1;
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297 debug_message(3, "lwasm_next_context(): %d (%d) pass %d", r, as -> nextcontext, as -> passnum);
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298 return r;
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299 }
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300