annotate lwasm/macro.c @ 397:09fe7c40a082 3.0-beta1

Branched for 3.0-beta1 release
author lost@l-w.ca
date Fri, 23 Jul 2010 17:12:47 -0600
parents a82c55070624
children
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1 /*
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2 macro.c
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3 Copyright © 2008 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 Contains stuff associated with macro 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 <ctype.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #include <stdio.h>
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29
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30 #include <lw_alloc.h>
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31 #include <lw_string.h>
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32
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33 #include "lwasm.h"
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34 #include "input.h"
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35 #include "instab.h"
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36
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37 PARSEFUNC(pseudo_parse_macro)
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38 {
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39 macrotab_t *m;
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40
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41 l -> len = 0;
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42
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43 if (as -> skipcond)
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44 {
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45 as -> skipmacro = 1;
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46 return;
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47 }
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48
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49 if (as -> inmacro)
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50 {
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51 lwasm_register_error(as, l, "Attempt to define a macro inside a macro");
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52 return;
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53 }
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54
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55 if (!(l -> sym))
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56 {
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57 lwasm_register_error(as, l, "Missing macro name");
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58 return;
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59 }
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60
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61 for (m = as -> macros; m; m = m -> next)
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62 {
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63 if (!strcmp(m -> name, l -> sym))
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64 break;
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65 }
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66 if (m)
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67 {
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68 lwasm_register_error(as, l, "Duplicate macro definition");
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69 return;
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70 }
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71
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72 m = lw_alloc(sizeof(macrotab_t));
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73 m -> name = lw_strdup(l -> sym);
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74 m -> next = as -> macros;
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75 m -> lines = NULL;
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76 m -> numlines = 0;
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77 as -> macros = m;
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78
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79 while (**p && !isspace(**p))
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80 (*p)++;
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81
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82 as -> inmacro = 1;
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83 }
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84
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85 PARSEFUNC(pseudo_parse_endm)
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86 {
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87 l -> len = 0;
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88
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89 if (as -> skipcond)
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90 {
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91 as -> skipmacro = 0;
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92 return;
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93 }
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94
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95 if (!as -> inmacro)
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96 {
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97 lwasm_register_error(as, l, "ENDM without MACRO");
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98 return;
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99 }
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100
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101 as -> inmacro = 0;
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102
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103 // a macro definition counts as a context break for local symbols
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104 as -> context = lwasm_next_context(as);
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105 }
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106
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107 // the current macro will ALWAYS be the first one in the table
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108 int add_macro_line(asmstate_t *as, char *optr)
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109 {
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110 if (!as -> inmacro)
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111 return 0;
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112
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113 as -> macros -> lines = lw_realloc(as -> macros -> lines, sizeof(char *) * (as -> macros -> numlines + 1));
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114 as -> macros -> lines[as -> macros -> numlines] = lw_strdup(optr);
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115 as -> macros -> numlines += 1;
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116 return 1;
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117 }
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118
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119 void macro_add_to_buff(char **buff, int *loc, int *len, char c)
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120 {
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121 if (*loc == *len)
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122 {
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123 *buff = lw_realloc(*buff, *len + 32);
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124 *len += 32;
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125 }
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126 (*buff)[(*loc)++] = c;
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127 }
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128
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129 // this is just like a regular operation function
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130 /*
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131 macro args are referenced by "\n" where 1 <= n <= 9
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132 or by "\{n}"; a \ can be included by writing \\
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133 a comma separates argument but one can be included with "\,"
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134 whitespace ends argument list but can be included with "\ " or the like
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135
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136 */
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137 int expand_macro(asmstate_t *as, line_t *l, char **p, char *opc)
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138 {
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139 int lc;
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140 line_t *cl, *nl;
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141 int oldcontext;
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142 macrotab_t *m;
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143
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144 char **args = NULL; // macro arguments
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145 int nargs = 0; // number of arguments
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146
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147 char *p2, *p3;
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148
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149 int bloc, blen;
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150 char *linebuff;
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151
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152 for (m = as -> macros; m; m = m -> next)
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153 {
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154 if (!strcmp(opc, m -> name))
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155 break;
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156 }
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157 // signal no macro expansion
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158 if (!m)
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159 return -1;
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160
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161 // save current symbol context for after macro expansion
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162 oldcontext = as -> context;
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163
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164 cl = l;
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165
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166 as -> context = lwasm_next_context(as);
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167
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168 while (**p && !isspace(**p) && **p != ',')
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169 {
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170 p2 = *p;
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171 while (*p2 && !isspace(*p2) && *p2 != ',')
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172 {
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173 if (*p2 == '\\')
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174 {
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175 if (p2[1])
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176 p2++;
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177 }
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178 p2++;
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179 }
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180
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181 // have arg here
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182 args = lw_realloc(args, sizeof(char *) * (nargs + 1));
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183 args[nargs] = lw_alloc(p2 - *p + 1);
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184 args[nargs][p2 - *p] = '\0';
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185 memcpy(args[nargs], *p, p2 - *p);
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186 *p = p2;
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187
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188 // now collapse out "\" characters
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189 for (p3 = p2 = args[nargs]; *p2; p2++, p3++)
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190 {
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191 if (*p2 == '\\' && p2[1])
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192 {
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193 p2++;
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194 }
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195 *p3 = *p2;
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196 }
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197 *p3 = '\0';
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198
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199 nargs++;
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200 if (**p == ',')
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201 (*p)++;
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202 }
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203
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204
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205 // now create a string for the macro
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206 // and push it into the front of the input stack
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207 bloc = blen = 0;
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208 linebuff = NULL;
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209
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210 for (lc = 0; lc < m -> numlines; lc++)
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211 {
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212 for (p2 = m -> lines[lc]; *p2; p2++)
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213 {
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214 if (*p2 == '\\' && isdigit(p2[1]))
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215 {
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216 int n;
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217
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218 p2++;
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219 n = *p2 - '0';
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220 if (n == 0)
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221 {
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222 for (p3 = m -> name; *p3; p3++)
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223 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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224 continue;
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225 }
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226 if (n < 1 || n > nargs)
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227 continue;
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228 for (p3 = args[n - 1]; *p3; p3++)
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229 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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230 continue;
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231 }
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232 else if (*p2 == '{')
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233 {
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234 int n = 0, n2;
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235 p2++;
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236 while (*p2 && isdigit(*p2))
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237 {
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238 n2 = *p2 - '0';
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239 if (n2 < 0 || n2 > 9)
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240 n2 = 0;
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241 n = n * 10 + n2;
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242 p2++;
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243 }
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244 if (*p2 == '}')
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245 p2++;
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246
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247 if (n == 0)
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248 {
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249 for (p3 = m -> name; *p3; p3++)
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250 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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251 continue;
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252 }
345
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253 if (n < 1 || n > nargs)
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254 continue;
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255 for (p3 = args[n - 1]; *p3; p3++)
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256 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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257 continue;
339
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258 }
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259 else
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260 {
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261 macro_add_to_buff(&linebuff, &bloc, &blen, *p2);
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262 }
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263 }
339
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264
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265 macro_add_to_buff(&linebuff, &bloc, &blen, '\n');
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266
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267 }
339
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268
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269 {
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270 char ctcbuf[100];
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271 char *p;
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272 snprintf(ctcbuf, 100, "\001\001SETCONTEXT %d\n", oldcontext);
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273 for (p = ctcbuf; *p; p++)
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274 macro_add_to_buff(&linebuff, &bloc, &blen, *p);
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275 }
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276
345
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277 // push the macro into the front of the stream
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278 input_openstring(as, opc, linebuff);
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279
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280 lw_free(linebuff);
339
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281
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282 // clean up
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283 if (args)
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284 {
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285 while (nargs)
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286 {
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287 lw_free(args[--nargs]);
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288 }
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289 lw_free(args);
339
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290 }
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291
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292 // indicate a macro was expanded
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293 return 0;
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294 }