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339
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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 "lwasm.h"
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29 #include "instab.h"
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30 #include "util.h"
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31
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32 OPFUNC(pseudo_macro)
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33 {
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34 macrotab_t *m;
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35
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36 // if skipping a condition, flag in a macro
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37 if (as -> skipcond)
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38 {
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39 as -> skipmacro = 1;
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40 return;
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41 }
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42
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43 // actually define a macro
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44 if (as -> inmacro)
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45 {
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46 register_error(as, l, 1, "Attempt to define a macro inside a macro");
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47 return;
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48 }
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49
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50 as -> inmacro = 1;
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51
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52 // don't actually do anything if not pass 1
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53 if (as -> passnum != 1)
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54 return;
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55
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56
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57 if (!l -> sym)
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58 {
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59 register_error(as, l, 1, "Macro definition with no effect - no symbol");
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60 return;
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61 }
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62
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63 // search for macro by same name...
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64 for (m = as -> macros; m; m = m -> next)
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65 {
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66 if (!strcmp(m -> name, l -> sym))
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67 break;
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68 }
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69 if (m)
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70 {
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71 register_error(as, l, 1, "Duplicate macro definition");
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72 return;
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73 }
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74
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75 m = lwasm_alloc(sizeof(macrotab_t));
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76 m -> name = lwasm_strdup(l -> sym);
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77 m -> next = as -> macros;
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78 m -> lines = NULL;
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79 m -> numlines = 0;
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80 as -> macros = m;
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81
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82 while (**p && !isspace(**p))
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83 (*p)++;
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84 }
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85
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86 OPFUNC(pseudo_endm)
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87 {
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88 if (as -> skipcond)
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89 {
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90 as -> skipmacro = 0;
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91 return;
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92 }
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93
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94 if (!as -> inmacro)
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95 {
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96 register_error(as, l, 1, "ENDM without MACRO");
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97 return;
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98 }
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99
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100 as -> inmacro = 0;
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101
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102 // a macro definition counts as a context break for local symbols
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103 as -> context = lwasm_next_context(as);
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104 }
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105
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106 // the current macro will ALWAYS be the first one in the table
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107 int add_macro_line(asmstate_t *as, char *optr)
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108 {
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109 if (!as -> inmacro)
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110 return 0;
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111
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112 if (as -> passnum == 2)
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113 return 1;
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114
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115 as -> macros -> lines = lwasm_realloc(as -> macros -> lines, sizeof(char *) * (as -> macros -> numlines + 1));
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116 as -> macros -> lines[as -> macros -> numlines] = lwasm_strdup(optr);
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117 as -> macros -> numlines += 1;
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118 return 1;
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119 }
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120
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121 void macro_add_to_buff(char **buff, int *loc, int *len, char c)
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122 {
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123 if (*loc == *len)
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124 {
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125 *buff = lwasm_realloc(*buff, *len + 32);
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126 *len += 32;
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127 }
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128 (*buff)[(*loc)++] = c;
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129 }
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130
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131 // this is just like a regular operation function
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132 /*
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133 macro args are referenced by "\n" where 1 <= n <= 9
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134 or by "\{n}"; a \ can be included by writing \\
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135 a comma separates argument but one can be included with "\,"
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136 whitespace ends argument list but can be included with "\ " or the like
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137
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138 In pass 1, actually add the lines to the system, in pass 2, do not
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139 In pass 2, track the number of lines to skip because they already will be
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140 processed by this function - this will be in as -> skiplines
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141
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142 */
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143 int expand_macro(asmstate_t *as, lwasm_line_t *l, char **p, char *opc)
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144 {
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145 int lc;
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146 lwasm_line_t *cl, *nl;
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147 int oldcontext;
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148 macrotab_t *m;
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149
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150 char **args = NULL; // macro arguments
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151 int nargs = 0; // number of arguments
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152
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153 char *p2, *p3;
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154
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155 int bloc, blen;
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156 char *linebuff;
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157
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158 for (m = as -> macros; m; m = m -> next)
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159 {
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160 if (!strcmp(opc, m -> name))
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161 break;
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162 }
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163 // signal no macro expansion
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164 if (!m)
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165 return -1;
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166
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167
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168 // save current symbol context for after macro expansion
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169 oldcontext = as -> context;
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170
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171 cl = l;
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172
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173 as -> context = lwasm_next_context(as);
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174
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175 // step 1: parse arguments (pass 1 only)
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176 if (as -> passnum == 1)
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177 {
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178 while (**p && !isspace(**p) && **p != ',')
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179 {
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180 p2 = *p;
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181 while (*p2 && !isspace(*p2) && *p2 != ',')
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182 {
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183 if (*p2 == '\\')
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184 {
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185 if (p2[1])
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186 p2++;
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187 }
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188 p2++;
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189 }
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190
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191 // have arg here
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192 args = lwasm_realloc(args, sizeof(char *) * (nargs + 1));
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193 args[nargs] = lwasm_alloc(p2 - *p + 1);
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194 args[nargs][p2 - *p] = '\0';
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195 memcpy(args[nargs], *p, p2 - *p);
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196 *p = p2;
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197
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198 // now collapse out "\" characters
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199 for (p3 = p2 = args[nargs]; *p2; p2++, p3++)
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200 {
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201 if (*p2 == '\\' && p2[1])
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202 {
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203 p2++;
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204 }
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205 *p3 = *p2;
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206 }
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207 *p3 = '\0';
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208
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209 nargs++;
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210 if (**p == ',')
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211 (*p)++;
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212 }
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213 }
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214
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215 {
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216 int i;
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217 for (i = 0; i < nargs; i++)
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218 {
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219 debug_message(10, "Macro (%s) arg %d: %s", m -> name, i + 1, args[i]);
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220 }
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221 }
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222
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223 // step 2: iterate over the lines
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224 if (as -> passnum == 2)
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225 {
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226 // pass 2 only - parse the lines and count them
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227 for (lc = 0; lc < m -> numlines; lc++)
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228 {
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229 cl = cl -> next;
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230 as -> skiplines++;
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231 lwasm_parse_line(as, cl);
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232 }
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233 }
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234 else
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235 {
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236 // pass 1 only - construct the lines and parse them
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237 for (lc = 0; lc < m -> numlines; lc++)
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238 {
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239 nl = lwasm_alloc(sizeof(lwasm_line_t));
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240 nl -> lineno = lc + 1;
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241 nl -> filename = m -> name;
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242 nl -> next = NULL;
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243 nl -> prev = as -> linestail;
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244 nl -> err = NULL;
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245 nl -> fsize = 0;
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246 nl -> sym = NULL;
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247 nl -> bytes = NULL;
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248 nl -> codelen = 0;
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249 nl -> codesize = 0;
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250 nl -> nocodelen = 0;
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251 nl -> addrset = 0;
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252 nl -> symaddr = -1;
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253 nl -> badop = 0;
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254 nl -> relocoff = -1;
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255 if (as -> linestail)
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256 as -> linestail -> next = nl;
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257 as -> linestail = nl;
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258 if (!(as -> lineshead))
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259 as -> lineshead = nl;
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260
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261 bloc = blen = 0;
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262 linebuff = NULL;
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263 for (p2 = m -> lines[lc]; *p2; p2++)
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264 {
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265 if (*p2 == '\\' && isdigit(p2[1]))
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266 {
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267 int n;
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268
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269 p2++;
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270 n = *p2 - '0';
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271 if (n == 0)
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272 {
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273 for (p3 = m -> name; *p3; p3++)
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274 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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275 continue;
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276 }
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277 if (n < 1 || n > nargs)
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278 continue;
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279 for (p3 = args[n - 1]; *p3; p3++)
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280 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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281 continue;
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282 }
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283 else if (*p2 == '{')
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284 {
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285 int n = 0, n2;
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286 p2++;
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287 while (*p2 && isdigit(*p2))
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288 {
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289 n2 = *p2 - '0';
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290 if (n2 < 0 || n2 > 9)
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291 n2 = 0;
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292 n = n * 10 + n2;
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293 p2++;
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294 }
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295 if (*p2 == '}')
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296 p2++;
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297
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298 if (n == 0)
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299 {
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300 for (p3 = m -> name; *p3; p3++)
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301 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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302 continue;
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303 }
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304 if (n < 1 || n > nargs)
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305 continue;
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306 for (p3 = args[n - 1]; *p3; p3++)
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307 macro_add_to_buff(&linebuff, &bloc, &blen, *p3);
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308 continue;
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309 }
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310 else
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311 {
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312 macro_add_to_buff(&linebuff, &bloc, &blen, *p2);
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313 }
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314 }
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315
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316 macro_add_to_buff(&linebuff, &bloc, &blen, 0);
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317
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318 nl -> text = linebuff;
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319
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320 lwasm_parse_line(as, nl);
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321 if (as -> endseen)
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322 break;
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323
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324 }
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325 }
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326
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327 // restore context from before the macro was called
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328 as -> context = oldcontext;
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329
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330 // clean up
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331 if (args)
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332 {
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333 while (nargs)
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334 {
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335 lwasm_free(args[--nargs]);
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336 }
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337 lwasm_free(args);
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338 }
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339
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340 // indicate a macro was expanded
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341 return 0;
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342 }
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