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annotate lwasm/struct.c @ 404:0324fd09c7ac

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Added documentation for the --symbol option for lwasm
author lost@l-w.ca
date Fri, 23 Jul 2010 18:31:33 -0600
parents fbb7bfed8076
children
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389
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1 /*
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2 struct.c
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3 Copyright © 2010 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 Contains stuff associated with structure processing
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21 */
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22
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23 #include <config.h>
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24
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25 #include <string.h>
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26
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27 #include <lw_alloc.h>
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28 #include <lw_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
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33 PARSEFUNC(pseudo_parse_struct)
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34 {
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35 structtab_t *s;
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36
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37 if (as -> instruct)
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38 {
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39 lwasm_register_error(as, l, "Attempt to define a structure inside a structure");
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40 return;
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41 }
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42
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43 if (l -> sym == NULL)
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44 {
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45 lwasm_register_error(as, l, "Structure definition with no effect - no symbol");
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46 return;
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47 }
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48
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49 for (s = as -> structs; s; s = s -> next)
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50 {
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51 if (!strcmp(s -> name, l -> sym))
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52 break;
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53 }
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54
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55 if (s)
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56 {
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57 lwasm_register_error(as, l, "Duplicate structure definition");
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58 return;
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59 }
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60
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61 as -> instruct = 1;
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62
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63 s = lw_alloc(sizeof(structtab_t));
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64 s -> name = lw_strdup(l -> sym);
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65 s -> next = as -> structs;
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66 s -> fields = NULL;
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67 s -> size = 0;
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68 as -> structs = s;
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69 as -> cstruct = s;
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70
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71 skip_operand(p);
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72
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73 l -> len = 0;
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74 l -> symset = 1;
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75 }
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76
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77 void pseudo_endstruct_aux(asmstate_t *as, line_t *l, structtab_field_t *e, const char *prefix, int *coff)
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78 {
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79 char *symname = NULL;
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80 lw_expr_t te1, te2;
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81
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82 while (e)
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83 {
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84 if (e -> name)
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85 0 == asprintf(&symname, "%s.%s", prefix, e -> name);
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86 else
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87 0 == asprintf(&symname, "%s.____%d", prefix, *coff);
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88
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89 // register the symbol
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90 te1 = lw_expr_build(lw_expr_type_int, *coff);
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91 te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, te1, l -> addr);
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92 register_symbol(as, l, symname, te2, symbol_flag_nocheck);
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93 lw_expr_destroy(te2);
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94 lw_expr_destroy(te1);
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95
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96 if (e -> substruct)
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97 {
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98 char *t;
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99 0 == asprintf(&t, "sizeof{%s}", symname);
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100 te1 = lw_expr_build(lw_expr_type_int, e -> substruct -> size);
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101 register_symbol(as, l, t, te1, symbol_flag_nocheck);
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102 lw_expr_destroy(te1);
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103 lw_free(t);
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104 pseudo_endstruct_aux(as, l, e -> substruct -> fields, symname, coff);
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105 }
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106 else
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107 {
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108 *coff += e -> size;
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109 }
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110 e = e -> next;
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111 }
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112 }
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113
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114
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115 PARSEFUNC(pseudo_parse_endstruct)
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116 {
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117 char *t;
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118 int coff = 0;
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119 lw_expr_t te;
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120
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121 if (as -> instruct == 0)
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122 {
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123 lwasm_register_warning(as, l, "endstruct without struct");
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124 skip_operand(p);
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125 return;
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126 }
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127
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128 0 == asprintf(&t, "sizeof{%s}", as -> cstruct -> name);
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129 te = lw_expr_build(lw_expr_type_int, as -> cstruct -> size);
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130 register_symbol(as, l, t, te, symbol_flag_nocheck);
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131 lw_expr_destroy(te);
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132 lw_free(t);
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133
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134 l -> soff = as -> cstruct -> size;
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135 as -> instruct = 0;
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136
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137 skip_operand(p);
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138
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139 pseudo_endstruct_aux(as, l, as -> cstruct -> fields, as -> cstruct -> name, &coff);
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140
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141 l -> len = 0;
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142 }
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143
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144 void register_struct_entry(asmstate_t *as, line_t *l, int size, structtab_t *ss)
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145 {
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146 structtab_field_t *e, *e2;
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147
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148 l -> soff = as -> cstruct -> size;
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149 e = lw_alloc(sizeof(structtab_field_t));
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150 e -> next = NULL;
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151 e -> size = size;
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152 if (l -> sym)
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153 e -> name = lw_strdup(l -> sym);
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154 else
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155 e -> name = NULL;
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156 e -> substruct = ss;
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157 if (as -> cstruct -> fields)
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158 {
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159 for (e2 = as -> cstruct -> fields; e2 -> next; e2 = e2 -> next)
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160 /* do nothing */ ;
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161 e2 -> next = e;
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162 }
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163 else
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164 {
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165 as -> cstruct -> fields = e;
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166 }
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167 as -> cstruct -> size += size;
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168 }
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169
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170 int expand_struct(asmstate_t *as, line_t *l, char **p, char *opc)
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171 {
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172 structtab_t *s;
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173 char *t;
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174 lw_expr_t te;
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175 int addr = 0;
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176
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177 debug_message(as, 200, "Checking for structure expansion: %s", opc);
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178
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179 for (s = as -> structs; s; s = s -> next)
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180 {
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181 if (!strcmp(opc, s -> name))
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182 break;
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183 }
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184
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185 if (!s)
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186 return -1;
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187
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188 debug_message(as, 10, "Expanding structure: %s", opc);
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189
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190 if (!(l -> sym))
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191 {
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192 lwasm_register_error(as, l, "Cannot declare a structure without a symbol name.");
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193 return;
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194 }
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195
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196 l -> len = s -> size;
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197
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198 if (as -> instruct)
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199 0 == asprintf(&t, "sizeof(%s.%s}", as -> cstruct -> name, l -> sym);
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200 else
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201 0 == asprintf(&t, "sizeof{%s}", l -> sym);
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202 te = lw_expr_build(lw_expr_type_int, s -> size);
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203 register_symbol(as, l, t, te, symbol_flag_nocheck);
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204 lw_expr_destroy(te);
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205 lw_free(t);
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206
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207 if (as -> instruct)
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208 0 == asprintf(&t, "%s.%s", as -> cstruct -> name, l -> sym);
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209 else
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210 t = lw_strdup(l -> sym);
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211 pseudo_endstruct_aux(as, l, s -> fields, t, &addr);
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212 lw_free(t);
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213 l -> symset = 1;
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214 if (as -> instruct)
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215 register_struct_entry(as, l, s -> size, s);
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216 return 0;
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217 }
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218