annotate lwasm/section.c @ 445:7899511b2102 3.0

Added tag 3.0.1 for changeset a8934dfba400
author lost@l-w.ca
date Sat, 30 Oct 2010 15:22:55 -0600
parents 35a0b086bf4a
children
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1 /*
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2 section.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <config.h>
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23
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24 #include <string.h>
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25
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26 #include <lw_string.h>
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27 #include <lw_alloc.h>
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28
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29 #include "lwasm.h"
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30 #include "instab.h"
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31
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32 PARSEFUNC(pseudo_parse_section)
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33 {
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34 char *p2;
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35 char *sn;
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36 char *opts = NULL;
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37 sectiontab_t *s;
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38
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39 if (as -> output_format != OUTPUT_OBJ)
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40 {
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41 lwasm_register_error(as, l, "Cannot use sections unless using the object target");
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42 return;
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43 }
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44
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45 if (!**p)
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46 {
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47 lwasm_register_error(as, l, "Need section name");
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48 return;
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49 }
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50
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51 l -> len = 0;
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52
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53 if (as -> csect)
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54 {
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55 lw_expr_destroy(as -> csect -> offset);
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56 as -> csect -> offset = lw_expr_copy(l -> addr);
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57 as -> csect = NULL;
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58 }
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59
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60 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++)
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61 /* do nothing */ ;
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62
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63 sn = lw_strndup(*p, p2 - *p);
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64 *p = p2;
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65
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66 if (**p == ',')
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67 {
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68 // have opts
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69 (*p)++;
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70
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71 for (p2 = *p; *p2 && !isspace(*p2); p2++)
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72 /* do nothing */ ;
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73
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74 opts = lw_strndup(*p, p2 - *p);
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75 *p = p2;
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76 }
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77
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78 for (s = as -> sections; s; s = s -> next)
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79 {
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80 if (!strcmp(s -> name, sn))
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81 break;
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82 }
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83 if (s && opts)
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84 {
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85 lwasm_register_warning(as, l, "Section flags can only be specified the first time; ignoring duplicate definition");
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86 }
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87 if (!s)
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88 {
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89 // create section data structure
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90 s = lw_alloc(sizeof(sectiontab_t));
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91 s -> oblen = 0;
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92 s -> obsize = 0;
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93 s -> obytes = NULL;
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94 s -> name = lw_strdup(sn);
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95 s -> offset = lw_expr_build(lw_expr_type_special, lwasm_expr_secbase, s);
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96 s -> flags = section_flag_none;
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97 s -> reloctab = NULL;
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98 if (!strcasecmp(sn, "bss") || !strcasecmp(sn, ".bss"))
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99 {
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100 s -> flags |= section_flag_bss;
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101 }
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102 // parse options
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103 if (opts)
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104 {
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105 // only one option ("bss" or "!bss")
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106 if (!strcasecmp(opts, "bss"))
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107 {
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108 s -> flags |= section_flag_bss;
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109 }
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110 else if (!strcasecmp(opts, "!bss"))
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111 {
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112 s -> flags &= ~section_flag_bss;
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113 }
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114 else
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115 {
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116 lwasm_register_error(as, l, "Unrecognized section flag");
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117 lw_free(sn);
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118 lw_free(opts);
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119 lw_free(s -> name);
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120 lw_expr_destroy(s -> offset);
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121 lw_free(s);
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122 return;
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123 }
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124 }
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125 s -> next = as -> sections;
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126 as -> sections = s;
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127 }
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128
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129 lw_expr_destroy(l -> addr);
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130 l -> addr = lw_expr_copy(s -> offset);
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131
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132 as -> csect = s;
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133 as -> context = lwasm_next_context(as);
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134
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135 l -> len = 0;
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136
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137 lw_free(opts);
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138 lw_free(sn);
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139 }
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140
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141 PARSEFUNC(pseudo_parse_endsection)
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142 {
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143 if (as -> output_format != OUTPUT_OBJ)
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144 {
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145 lwasm_register_error(as, l, "Cannot use sections unless using the object target");
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146 return;
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147 }
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148
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149 l -> len = 0;
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150
353
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151 if (!(as -> csect))
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152 {
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153 lwasm_register_error(as, l, "ENDSECTION without SECTION");
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154 return;
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155 }
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156
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157 // save offset in case another instance of the section appears
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158 lw_expr_destroy(as -> csect -> offset);
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159 as -> csect -> offset = l -> addr;
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160
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161 // reset address to 0
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162 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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163 as -> csect = NULL;
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164
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165 // end of section is a context break
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166 as -> context = lwasm_next_context(as);
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167
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168 skip_operand(p);
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169 }
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170
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171 PARSEFUNC(pseudo_parse_export)
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172 {
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173 int after = 0;
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174 char *sym = NULL;
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175 exportlist_t *e;
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176
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177 if (as -> output_format != OUTPUT_OBJ)
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178 {
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179 lwasm_register_error(as, l, "EXPORT only supported for object target");
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180 return;
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181 }
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183 l -> len = 0;
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184
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185 if (l -> sym)
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186 {
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187 sym = lw_strdup(l -> sym);
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188 l -> symset = 1;
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189 }
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190
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191 if (l -> sym)
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192 {
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193 skip_operand(p);
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194 }
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195
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196 again:
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197 if (after || !sym)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
198 {
7166254491ed Finished pseudo ops
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diff changeset
199 char *p2;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
200
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
201 after = 1;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
202 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
203 /* do nothing */ ;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
204
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
205 sym = lw_strndup(*p, p2 - *p);
385
cf8c92d70eb1 Various bugfixes
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parents: 380
diff changeset
206 *p = p2;
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
207 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
208 if (!sym)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
209 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
210 lwasm_register_error(as, l, "No symbol for EXPORT");
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
211 return;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
212 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
213
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
214 // add the symbol to the "export" list (which will be resolved
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
215 // after the parse pass is complete
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
216 e = lw_alloc(sizeof(exportlist_t));
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
217 e -> next = as -> exportlist;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
218 e -> symbol = lw_strdup(sym);
363
d96c30e60ddf Added pass2 and various supporting logic including symbol lookups
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parents: 356
diff changeset
219 e -> line = l;
374
d99322ef6f21 Stage 1: actually do output
lost@starbug
parents: 367
diff changeset
220 e -> se = NULL;
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
221 as -> exportlist = e;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
222 lw_free(sym);
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
223
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
224 if (after && **p == ',')
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
225 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
226 (*p)++;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
227 for (; **p && isspace(**p); (*p)++)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
228 /* do nothing */ ;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
229 goto again;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
230 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
231 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
232
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
233 PARSEFUNC(pseudo_parse_extern)
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diff changeset
234 {
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diff changeset
235 int after = 0;
7166254491ed Finished pseudo ops
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diff changeset
236 char *sym = NULL;
7166254491ed Finished pseudo ops
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diff changeset
237 importlist_t *e;
7166254491ed Finished pseudo ops
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diff changeset
238
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
239 if (as -> output_format != OUTPUT_OBJ)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
240 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
241 lwasm_register_error(as, l, "IMPORT only supported for object target");
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
242 return;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
243 }
7166254491ed Finished pseudo ops
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diff changeset
244
387
a741d2e4869f Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents: 385
diff changeset
245 l -> len = 0;
a741d2e4869f Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents: 385
diff changeset
246
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
247 if (l -> sym)
385
cf8c92d70eb1 Various bugfixes
lost@starbug
parents: 380
diff changeset
248 {
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
249 sym = lw_strdup(l -> sym);
385
cf8c92d70eb1 Various bugfixes
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parents: 380
diff changeset
250 l -> symset = 1;
cf8c92d70eb1 Various bugfixes
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parents: 380
diff changeset
251 }
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
252
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
253 if (l -> sym)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
254 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
255 skip_operand(p);
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
256 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
257
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
258 again:
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
259 if (after || !sym)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
260 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
261 char *p2;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
262
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
263 after = 1;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
264 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
265 /* do nothing */ ;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
266
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
267 sym = lw_strndup(*p, p2 - *p);
385
cf8c92d70eb1 Various bugfixes
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parents: 380
diff changeset
268 *p = p2;
356
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
269 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
270 if (!sym)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
271 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
272 lwasm_register_error(as, l, "No symbol for IMPORT");
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
273 return;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
274 }
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
275
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
276 // add the symbol to the "export" list (which will be resolved
7166254491ed Finished pseudo ops
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diff changeset
277 // after the parse pass is complete
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
278 e = lw_alloc(sizeof(importlist_t));
7166254491ed Finished pseudo ops
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diff changeset
279 e -> next = as -> importlist;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
280 e -> symbol = lw_strdup(sym);
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
281 as -> importlist = e;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
282 lw_free(sym);
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
283
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
284 if (after && **p == ',')
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
285 {
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
286 (*p)++;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
287 for (; **p && isspace(**p); (*p)++)
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
288 /* do nothing */ ;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
289 goto again;
7166254491ed Finished pseudo ops
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parents: 353
diff changeset
290 }
7166254491ed Finished pseudo ops
lost@starbug
parents: 353
diff changeset
291 }
380
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
292
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
293 PARSEFUNC(pseudo_parse_extdep)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
294 {
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
295 int after = 0;
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
296 char *sym = NULL;
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
297 importlist_t *e;
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
298
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
299 if (as -> output_format != OUTPUT_OBJ)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
300 {
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
301 lwasm_register_error(as, l, "EXTDEP only supported for object target");
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
302 return;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
303 }
cc154dc614fe Added extdep pseudo back in
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parents: 374
diff changeset
304
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
305 if (!as -> csect)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
306 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
307 lwasm_register_error(as, l, "EXTDEP must be within a section");
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
308 return;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
309 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
310
387
a741d2e4869f Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents: 385
diff changeset
311 l -> len = 0;
a741d2e4869f Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents: 385
diff changeset
312
380
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
313 if (l -> sym)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
314 sym = lw_strdup(l -> sym);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
315
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
316 if (l -> sym)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
317 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
318 skip_operand(p);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
319 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
320
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
321 again:
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
322 if (after || !sym)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
323 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
324 char *p2;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
325
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
326 after = 1;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
327 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
328 /* do nothing */ ;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
329
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
330 sym = lw_strndup(*p, p2 - *p);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
331 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
332 if (!sym)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
333 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
334 lwasm_register_error(as, l, "No symbol for EXTDEP");
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
335 return;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
336 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
337
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
338 // create a zero-width dependency
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
339 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
340 lw_expr_t e;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
341 e = lw_expr_build(lw_expr_type_int, 0);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
342 lwasm_emitexpr(l, e, 0);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
343 lw_expr_destroy(e);
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
344 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
345
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
346 if (after && **p == ',')
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
347 {
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
348 (*p)++;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
349 for (; **p && isspace(**p); (*p)++)
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
350 /* do nothing */ ;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
351 goto again;
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
352 }
cc154dc614fe Added extdep pseudo back in
lost@starbug
parents: 374
diff changeset
353 }