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annotate lwasm/pragma.c @ 53:cb4efc47ce9d

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Allow macros to shadow/override builtin operations when the "shadow" pragma is active, which is NOT the default
author lost@l-w.ca
date Tue, 05 Apr 2011 21:48:51 -0600
parents 7317fbe024af
children 337301ddf74a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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>
0
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27
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28 #include "lwasm.h"
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29 #include "instab.h"
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30
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31 struct pragma_list
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32 {
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33 const char *str;
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34 int flag;
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35 };
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36
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37 static const struct pragma_list set_pragmas[] =
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38 {
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39 { "dollarnotlocal", PRAGMA_DOLLARNOTLOCAL },
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40 { "noindex0tonone", PRAGMA_NOINDEX0TONONE },
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41 { "undefextern", PRAGMA_UNDEFEXTERN },
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42 { "cescapes", PRAGMA_CESCAPES },
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43 { "importundefexport", PRAGMA_IMPORTUNDEFEXPORT },
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44 { "pcaspcr", PRAGMA_PCASPCR },
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cb4efc47ce9d Allow macros to shadow/override builtin operations when the "shadow" pragma is active, which is NOT the default
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45 { "shadow", PRAGMA_SHADOW },
0
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46 { 0, 0 }
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47 };
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48
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49 static const struct pragma_list reset_pragmas[] =
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50 {
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51 { "nodollarnotlocal", PRAGMA_DOLLARNOTLOCAL },
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52 { "index0tonone", PRAGMA_NOINDEX0TONONE },
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53 { "noundefextern", PRAGMA_UNDEFEXTERN },
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54 { "nocescapes", PRAGMA_CESCAPES },
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55 { "noimportundefexport", PRAGMA_IMPORTUNDEFEXPORT },
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56 { "nopcaspcr", PRAGMA_PCASPCR },
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57 { "noshadow", PRAGMA_SHADOW },
0
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58 { 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].str; i++)
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72 {
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73 if (!strcasecmp(p, set_pragmas[i].str))
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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 }
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78 }
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79 for (i = 0; reset_pragmas[i].str; i++)
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80 {
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81 if (!strcasecmp(p, reset_pragmas[i].str))
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82 {
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83 pragmas &= ~(reset_pragmas[i].flag);
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84 goto out;
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85 }
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86 }
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87 /* unrecognized pragma here */
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88 if (!ignoreerr)
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89 {
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90 lw_free(p);
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91 return 0;
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92 }
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93 out:
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94 lw_free(p);
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95 }
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96 as -> pragmas = pragmas;
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97 return 1;
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98 }
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99
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100 PARSEFUNC(pseudo_parse_pragma)
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101 {
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102 char *ps, *t;
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103
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104 for (t = *p; *t && !isspace(*t); t++)
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105 /* do nothing */ ;
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106
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107 ps = lw_strndup(*p, t - *p);
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108 *p = t;
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109
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110 if (parse_pragma_string(as, ps, 0) == 0)
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111 {
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112 lwasm_register_error(as, l, "Unrecognized pragma string");
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113 }
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114 lw_free(ps);
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115 }
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116
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117 PARSEFUNC(pseudo_parse_starpragma)
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118 {
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119 char *ps, *t;
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120
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121 for (t = *p; *t && !isspace(*t); t++)
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122 /* do nothing */ ;
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123
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124 ps = lw_strndup(*p, t - *p);
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125 *p = t;
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126
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127 // *pragma must NEVER throw an error
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128 parse_pragma_string(as, ps, 1);
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129 lw_free(ps);
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130 }