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annotate lwasm/struct.c @ 294:048adfee2933 ccdev

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Checkpoint on lwcc-cpp development This checkpoint includes a tokenizer and basic implementation of #if, #ifdef, #ifndef, #else, #endif, #elif, and #undef along with basic symbol table management.
author William Astle <lost@l-w.ca>
date Tue, 10 Sep 2013 19:56:05 -0600
parents 211fc8038b8d
children 8764142b3192
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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 <string.h>
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24
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25 #include <lw_alloc.h>
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26 #include <lw_string.h>
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 PARSEFUNC(pseudo_parse_struct)
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32 {
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33 structtab_t *s;
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34
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35 if (as -> instruct)
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36 {
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37 lwasm_register_error(as, l, "Attempt to define a structure inside a structure");
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38 return;
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39 }
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40
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41 if (l -> sym == NULL)
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42 {
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43 lwasm_register_error(as, l, "Structure definition with no effect - no symbol");
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44 return;
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45 }
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46
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47 for (s = as -> structs; s; s = s -> next)
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48 {
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49 if (!strcmp(s -> name, l -> sym))
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50 break;
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51 }
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52
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53 if (s)
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54 {
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55 lwasm_register_error(as, l, "Duplicate structure definition");
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56 return;
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57 }
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58
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59 as -> instruct = 1;
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60
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61 s = lw_alloc(sizeof(structtab_t));
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62 s -> name = lw_strdup(l -> sym);
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63 s -> next = as -> structs;
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64 s -> fields = NULL;
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65 s -> size = 0;
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66 s -> definedat = l;
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67 as -> structs = s;
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68 as -> cstruct = s;
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69
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70 skip_operand(p);
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71
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72 l -> len = 0;
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73 l -> symset = 1;
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74
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75 // save current assembly address and initialize to 0
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76 as -> savedaddr = l -> addr;
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77 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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78 }
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79
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80 static void instantiate_struct(asmstate_t *as, line_t *l, structtab_t *s, char *pref, lw_expr_t baseaddr)
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81 {
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82 int len;
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83 char *t;
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84 int plen;
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85 int addr = 0;
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86 lw_expr_t te, te2;
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87 structtab_field_t *e;
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88
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89 if (baseaddr == NULL)
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90 baseaddr = l -> addr;
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91
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92 plen = strlen(pref);
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93 for (e = s -> fields; e; e = e -> next)
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94 {
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95 if (e -> name)
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96 {
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97 len = plen + strlen(e -> name) + 1;
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98 t = lw_alloc(len + 1);
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99 sprintf(t, "%s.%s", pref, e -> name);
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100 }
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101 else
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102 {
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103 len = plen + 30;
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104 t = lw_alloc(len + 1);
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105 sprintf(t, "%s.____%d", pref, addr);
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106 }
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107
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108 te = lw_expr_build(lw_expr_type_int, addr);
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109 te2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, te, baseaddr);
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110 register_symbol(as, l, t, te2, symbol_flag_nocheck);
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111 lw_expr_destroy(te);
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112
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113 if (e -> substruct)
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114 {
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115 instantiate_struct(as, l, e -> substruct, t, te2);
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116 }
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117
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118 lw_expr_destroy(te2);
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119
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120 lw_free(t);
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121 addr += e -> size;
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122 }
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123
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124 /* register the "sizeof" symbol */
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125 len = plen + 8;
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126 t = lw_alloc(len + 1);
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127 sprintf(t, "sizeof{%s}", pref);
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128 te = lw_expr_build(lw_expr_type_int, s -> size);
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129 register_symbol(as, l, t, te, symbol_flag_nocheck);
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130 lw_expr_destroy(te);
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131 lw_free(t);
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132 }
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133
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134
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135 PARSEFUNC(pseudo_parse_endstruct)
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136 {
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137 lw_expr_t te;
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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138
0
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139 if (as -> instruct == 0)
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140 {
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141 lwasm_register_warning(as, l, "endstruct without struct");
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142 skip_operand(p);
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143 return;
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144 }
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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145
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146 te = lw_expr_build(lw_expr_type_int, 0);
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147
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148 // make all the relevant generic struct symbols
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149 instantiate_struct(as, l, as -> cstruct, as -> cstruct -> name, te);
0
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150 lw_expr_destroy(te);
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151
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152 l -> soff = as -> cstruct -> size;
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153 as -> instruct = 0;
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154
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155 skip_operand(p);
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156
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157 lw_expr_destroy(l -> addr);
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158 l -> addr = as -> savedaddr;
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159 as -> savedaddr = NULL;
0
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160
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161 l -> len = 0;
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162 }
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163
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164 void register_struct_entry(asmstate_t *as, line_t *l, int size, structtab_t *ss)
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165 {
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166 structtab_field_t *e, *e2;
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167
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168 l -> soff = as -> cstruct -> size;
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169 e = lw_alloc(sizeof(structtab_field_t));
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170 e -> next = NULL;
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171 e -> size = size;
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172 if (l -> sym)
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173 e -> name = lw_strdup(l -> sym);
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174 else
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175 e -> name = NULL;
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176 e -> substruct = ss;
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177 if (as -> cstruct -> fields)
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178 {
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179 for (e2 = as -> cstruct -> fields; e2 -> next; e2 = e2 -> next)
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180 /* do nothing */ ;
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181 e2 -> next = e;
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182 }
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183 else
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184 {
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185 as -> cstruct -> fields = e;
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186 }
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187 as -> cstruct -> size += size;
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188 }
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189
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190 int expand_struct(asmstate_t *as, line_t *l, char **p, char *opc)
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191 {
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192 structtab_t *s;
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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193
0
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194 debug_message(as, 200, "Checking for structure expansion: %s", opc);
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195
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196 for (s = as -> structs; s; s = s -> next)
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197 {
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198 if (!strcmp(opc, s -> name))
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199 break;
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200 }
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201
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202 if (!s)
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203 return -1;
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204
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205 debug_message(as, 10, "Expanding structure: %s", opc);
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206
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207 if (!(l -> sym))
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208 {
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209 lwasm_register_error(as, l, "Cannot declare a structure without a symbol name.");
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7317fbe024af Clean up insane number of compiler warnings under -Wall
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210 return -1;
0
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211 }
47
1d6a31a2586b Fixed multiple symbol error with nested structs
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212
0
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213 l -> len = s -> size;
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214
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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215 if (as -> instruct)
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127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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216 {
61
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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217 /* register substruct here */
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218 register_struct_entry(as, l, s -> size, s);
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219 /* mark the symbol consumed */
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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220 l -> symset = 1;
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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221 l -> len = 0;
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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222 return 0;
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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223 }
0
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224 else
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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225 {
61
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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226 /* instantiate the struct here */
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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227 instantiate_struct(as, l, s, l -> sym, NULL);
ccaecdff3fc2 Make structure definitions not affect current assembly address and fix up cosmetic offset display in listings
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228 return 0;
10
127e5b1e01c0 Removed use of asprintf() and added Makefile options for cross compiling; also a bugfix with sizeof{} in lwasm
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229 }
0
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230
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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231 return 0;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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232 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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233