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annotate lwasm/pragma.c @ 115:344cfc25afec

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Added initial infrastructure for pragma autobranchlength (suggested by Ebonhand on irc)
author lost@l-w.ca
date Mon, 08 Aug 2011 23:00:27 -0600
parents 38c1537857ce
children b6b8c2645f5c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 /*
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2 pragma.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
2
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22 #include <string.h>
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23 #include <ctype.h>
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24
0
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25 #include <lw_string.h>
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26 #include <lw_alloc.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 #include "input.h"
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31
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32 struct pragma_list
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33 {
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34 const char *setstr;
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35 const char *resetstr;
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36 int flag;
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37 };
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38
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39 struct pragma_stack_entry
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40 {
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41 int magic; // must always be at the start of any input stack entry
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42 int flag; // the pragma flag bit
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43 char str[1]; // magic number - this will be allocated bigger
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44 // string will be what's needed to re-instate a pragma
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45 };
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46
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47 static const struct pragma_list set_pragmas[] =
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48 {
108
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49 { "dollarnotlocal", "nodollarnotlocal", PRAGMA_DOLLARNOTLOCAL },
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50 { "noindex0tonone", "index0tonone", PRAGMA_NOINDEX0TONONE },
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51 { "undefextern", "noundefextern", PRAGMA_UNDEFEXTERN },
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52 { "cescapes", "nocescapes", PRAGMA_CESCAPES },
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53 { "importundefexport", "noimportundefexport", PRAGMA_IMPORTUNDEFEXPORT },
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54 { "pcaspcr", "nopcaspcr", PRAGMA_PCASPCR },
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55 { "shadow", "noshadow", PRAGMA_SHADOW },
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56 { "nolist", "list", PRAGMA_NOLIST },
115
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57 { "autobranchlength", "noautobranchlength", PRAGMA_AUTOBRANCHLENGTH },
108
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58 { 0, 0, 0}
0
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59 };
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60
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61 int parse_pragma_string(asmstate_t *as, char *str, int ignoreerr)
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62 {
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63 char *p;
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64 int i;
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65 const char *np = str;
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66 int pragmas = as -> pragmas;
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67
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68 while (np)
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69 {
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70 p = lw_token(np, ',', &np);
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71 for (i = 0; set_pragmas[i].setstr; i++)
0
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72 {
108
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73 if (!strcasecmp(p, set_pragmas[i].setstr))
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74 {
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75 pragmas |= set_pragmas[i].flag;
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76 goto out;
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77 }
108
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78 if (!strcasecmp(p, set_pragmas[i].resetstr))
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79 {
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80 pragmas &= ~(set_pragmas[i].flag);
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81 goto out;
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82 }
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83 }
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84 /* unrecognized pragma here */
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85 if (!ignoreerr)
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86 {
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87 lw_free(p);
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88 return 0;
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89 }
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90 out:
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91 lw_free(p);
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92 }
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93 as -> pragmas = pragmas;
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94 return 1;
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95 }
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96
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97 PARSEFUNC(pseudo_parse_pragma)
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98 {
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99 char *ps, *t;
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100
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101 for (t = *p; *t && !isspace(*t); t++)
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102 /* do nothing */ ;
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103
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104 ps = lw_strndup(*p, t - *p);
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105 *p = t;
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106
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107 l -> len = 0;
0
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108
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109 if (parse_pragma_string(as, ps, 0) == 0)
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110 {
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111 lwasm_register_error(as, l, "Unrecognized pragma string");
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112 }
81
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113 if (as -> pragmas & PRAGMA_NOLIST)
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114 l -> pragmas |= PRAGMA_NOLIST;
0
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115 lw_free(ps);
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116 }
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117
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118 PARSEFUNC(pseudo_parse_starpragma)
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119 {
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120 char *ps, *t;
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121
0
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122 for (t = *p; *t && !isspace(*t); t++)
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123 /* do nothing */ ;
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124
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125 ps = lw_strndup(*p, t - *p);
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126 *p = t;
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127
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128 l -> len = 0;
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129
0
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130 // *pragma must NEVER throw an error
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131 parse_pragma_string(as, ps, 1);
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132 if (as -> pragmas & PRAGMA_NOLIST)
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133 l -> pragmas |= PRAGMA_NOLIST;
0
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134 lw_free(ps);
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135 }
108
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136
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137 static int pragma_stack_compare(input_stack_entry *e, void *d)
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138 {
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139 int flag = *((int *)d);
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140 struct pragma_stack_entry *pse = (struct pragma_stack_entry *)e;
110
38c1537857ce Pragma stack at parse stage now works
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141
108
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142 if (pse -> flag == flag)
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143 return 1;
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144 return 0;
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145 }
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146
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147 PARSEFUNC(pseudo_parse_starpragmapop)
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148 {
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149 char *ps, *t;
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150 char *pp;
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151 int i;
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152 const char *np;
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153 struct pragma_stack_entry *pse;
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154
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155 for (t = *p; *t && !isspace(*t); t++)
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156 /* do nothing */ ;
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157
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158 ps = lw_strndup(*p, t - *p);
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159 *p = t;
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160
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161 l -> len = 0;
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162
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163 // *pragma stuff must never throw an error
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164 np = ps;
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165
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166 while (np)
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167 {
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168 pp = lw_token(np, ',', &np);
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169 for (i = 0; set_pragmas[i].setstr; i++)
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170 {
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171 if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr))
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172 {
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173 pse = (struct pragma_stack_entry *)input_stack_pop(as, 0x42424242, pragma_stack_compare, (void *)&(set_pragmas[i].flag));
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174 if (pse)
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175 {
110
38c1537857ce Pragma stack at parse stage now works
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176 debug_message(as, 100, "Popped pragma string %s", pse->str);
108
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177 parse_pragma_string(as, (char *)&(pse->str), 1);
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178 lw_free(pse);
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179 }
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180 if (set_pragmas[i].flag == PRAGMA_NOLIST)
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181 l -> pragmas |= PRAGMA_NOLIST;
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182 }
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183 }
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184 lw_free(pp);
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185 }
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186
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187 lw_free(ps);
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188 }
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189
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190 PARSEFUNC(pseudo_parse_starpragmapush)
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191 {
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192 char *ps, *t;
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193 char *pp;
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194 int i;
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195 const char *np;
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196 struct pragma_stack_entry *pse;
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197
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198 for (t = *p; *t && !isspace(*t); t++)
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199 /* do nothing */ ;
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200
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201 ps = lw_strndup(*p, t - *p);
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202 *p = t;
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203
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204 l -> len = 0;
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205
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206 // *pragma stuff must never throw an error
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207 np = ps;
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208
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209 while (np)
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210 {
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211 pp = lw_token(np, ',', &np);
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212 for (i = 0; set_pragmas[i].setstr; i++)
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213 {
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214 if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr))
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215 {
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216 /* found set or reset pragma */
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217 /* push pragma state */
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218 if (as -> pragmas & (set_pragmas[i].flag))
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219 {
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220 /* use set string */
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221 t = (char *)set_pragmas[i].setstr;
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222 }
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223 else
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224 {
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225 /* use reset string */
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226 t = (char *)set_pragmas[i].resetstr;
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227 }
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228 pse = lw_alloc(sizeof(struct pragma_stack_entry) + strlen(t));
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229 pse -> flag = set_pragmas[i].flag;
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230 pse -> magic = 0x42424242;
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231 strcpy((char *)&(pse -> str), t);
110
38c1537857ce Pragma stack at parse stage now works
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232 debug_message(as, 100, "Pushed pragma string %s", pse->str);
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diff changeset
233
108
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234 input_stack_push(as, (input_stack_entry *)pse);
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235
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236 if (set_pragmas[i].flag == PRAGMA_NOLIST)
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diff changeset
237 l -> pragmas |= PRAGMA_NOLIST;
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238 }
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239 }
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240 lw_free(pp);
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241 }
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242
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243 lw_free(ps);
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244 }
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diff changeset
245