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annotate lwasm/pragma.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 0c4b3e8b4d0b
children 507f442dc71e
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 {
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49 { "dollarnotlocal", "nodollarnotlocal", PRAGMA_DOLLARNOTLOCAL },
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b6b8c2645f5c Add back the dollarlocal and nodollarlocal pragma strings for compatibility with the documentation.
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50 { "nodollarlocal", "dollarlocal", PRAGMA_DOLLARNOTLOCAL },
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51 { "noindex0tonone", "index0tonone", PRAGMA_NOINDEX0TONONE },
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52 { "undefextern", "noundefextern", PRAGMA_UNDEFEXTERN },
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53 { "cescapes", "nocescapes", PRAGMA_CESCAPES },
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54 { "importundefexport", "noimportundefexport", PRAGMA_IMPORTUNDEFEXPORT },
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55 { "pcaspcr", "nopcaspcr", PRAGMA_PCASPCR },
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56 { "shadow", "noshadow", PRAGMA_SHADOW },
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57 { "nolist", "list", PRAGMA_NOLIST },
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344cfc25afec Added initial infrastructure for pragma autobranchlength (suggested by Ebonhand on irc)
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58 { "autobranchlength", "noautobranchlength", PRAGMA_AUTOBRANCHLENGTH },
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080bb67d84f2 Add export pragma
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59 { "export", "noexport", PRAGMA_EXPORT },
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07e1fac76321 Added pragma to allow non case sensitive symbols
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60 { "symbolnocase", "nosymbolnocase", PRAGMA_SYMBOLNOCASE },
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61 { "nosymbolcase", "symbolcase", PRAGMA_SYMBOLNOCASE },
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62 { "condundefzero", "nocondundefzero", PRAGMA_CONDUNDEFZERO },
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63 { 0, 0, 0}
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64 };
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65
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66 int parse_pragma_string(asmstate_t *as, char *str, int ignoreerr)
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67 {
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68 char *p;
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69 int i;
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70 const char *np = str;
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71 int pragmas = as -> pragmas;
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72
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73 while (np)
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74 {
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75 p = lw_token(np, ',', &np);
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76 debug_message(as, 200, "Setting pragma %s", p);
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77 for (i = 0; set_pragmas[i].setstr; i++)
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78 {
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79 if (!strcasecmp(p, set_pragmas[i].setstr))
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80 {
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81 pragmas |= set_pragmas[i].flag;
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82 goto out;
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83 }
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84 if (!strcasecmp(p, set_pragmas[i].resetstr))
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85 {
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86 pragmas &= ~(set_pragmas[i].flag);
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87 goto out;
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88 }
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89 }
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90 /* unrecognized pragma here */
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91 if (!ignoreerr)
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92 {
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93 lw_free(p);
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94 return 0;
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95 }
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96 out:
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97 lw_free(p);
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98 }
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99 as -> pragmas = pragmas;
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100 return 1;
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101 }
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102
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103 PARSEFUNC(pseudo_parse_pragma)
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104 {
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105 char *ps, *t;
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106
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107 for (t = *p; *t && !isspace(*t); t++)
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108 /* do nothing */ ;
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109
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110 ps = lw_strndup(*p, t - *p);
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111 *p = t;
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112
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113 l -> len = 0;
0
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114
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115 if (parse_pragma_string(as, ps, 0) == 0)
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116 {
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117 lwasm_register_error(as, l, "Unrecognized pragma string");
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118 }
81
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119 if (as -> pragmas & PRAGMA_NOLIST)
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120 l -> pragmas |= PRAGMA_NOLIST;
0
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121 lw_free(ps);
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122 }
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123
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124 PARSEFUNC(pseudo_parse_starpragma)
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125 {
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126 char *ps, *t;
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8fa52c3f2970 Make *pragma work correctly
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127
0
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128 for (t = *p; *t && !isspace(*t); t++)
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129 /* do nothing */ ;
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130
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131 ps = lw_strndup(*p, t - *p);
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132 *p = t;
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133
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337301ddf74a Fixed error with pragma and *pragma directives
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diff changeset
134 l -> len = 0;
337301ddf74a Fixed error with pragma and *pragma directives
lost@l-w.ca
parents: 53
diff changeset
135
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
136 // *pragma must NEVER throw an error
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
137 parse_pragma_string(as, ps, 1);
81
428068681cbf Added nolist pragma to suppress listing output of non-code generating lines
Lost Wizard (lost@starbug3)
parents: 56
diff changeset
138 if (as -> pragmas & PRAGMA_NOLIST)
428068681cbf Added nolist pragma to suppress listing output of non-code generating lines
Lost Wizard (lost@starbug3)
parents: 56
diff changeset
139 l -> pragmas |= PRAGMA_NOLIST;
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
140 lw_free(ps);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
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141 }
108
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
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diff changeset
142
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lost@l-w.ca
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143 static int pragma_stack_compare(input_stack_entry *e, void *d)
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144 {
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lost@l-w.ca
parents: 85
diff changeset
145 int flag = *((int *)d);
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lost@l-w.ca
parents: 85
diff changeset
146 struct pragma_stack_entry *pse = (struct pragma_stack_entry *)e;
110
38c1537857ce Pragma stack at parse stage now works
lost@l-w.ca
parents: 108
diff changeset
147
108
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
148 if (pse -> flag == flag)
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lost@l-w.ca
parents: 85
diff changeset
149 return 1;
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lost@l-w.ca
parents: 85
diff changeset
150 return 0;
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lost@l-w.ca
parents: 85
diff changeset
151 }
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152
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
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parents: 85
diff changeset
153 PARSEFUNC(pseudo_parse_starpragmapop)
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lost@l-w.ca
parents: 85
diff changeset
154 {
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lost@l-w.ca
parents: 85
diff changeset
155 char *ps, *t;
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lost@l-w.ca
parents: 85
diff changeset
156 char *pp;
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lost@l-w.ca
parents: 85
diff changeset
157 int i;
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lost@l-w.ca
parents: 85
diff changeset
158 const char *np;
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lost@l-w.ca
parents: 85
diff changeset
159 struct pragma_stack_entry *pse;
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lost@l-w.ca
parents: 85
diff changeset
160
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
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161 for (t = *p; *t && !isspace(*t); t++)
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parents: 85
diff changeset
162 /* do nothing */ ;
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parents: 85
diff changeset
163
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lost@l-w.ca
parents: 85
diff changeset
164 ps = lw_strndup(*p, t - *p);
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parents: 85
diff changeset
165 *p = t;
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diff changeset
166
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lost@l-w.ca
parents: 85
diff changeset
167 l -> len = 0;
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168
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
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parents: 85
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169 // *pragma stuff must never throw an error
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parents: 85
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170 np = ps;
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171
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172 while (np)
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173 {
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lost@l-w.ca
parents: 85
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174 pp = lw_token(np, ',', &np);
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175 for (i = 0; set_pragmas[i].setstr; i++)
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parents: 85
diff changeset
176 {
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parents: 85
diff changeset
177 if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr))
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178 {
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179 pse = (struct pragma_stack_entry *)input_stack_pop(as, 0x42424242, pragma_stack_compare, (void *)&(set_pragmas[i].flag));
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
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parents: 85
diff changeset
180 if (pse)
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parents: 85
diff changeset
181 {
110
38c1537857ce Pragma stack at parse stage now works
lost@l-w.ca
parents: 108
diff changeset
182 debug_message(as, 100, "Popped pragma string %s", pse->str);
108
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
183 parse_pragma_string(as, (char *)&(pse->str), 1);
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lost@l-w.ca
parents: 85
diff changeset
184 lw_free(pse);
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lost@l-w.ca
parents: 85
diff changeset
185 }
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lost@l-w.ca
parents: 85
diff changeset
186 if (set_pragmas[i].flag == PRAGMA_NOLIST)
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lost@l-w.ca
parents: 85
diff changeset
187 l -> pragmas |= PRAGMA_NOLIST;
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parents: 85
diff changeset
188 }
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lost@l-w.ca
parents: 85
diff changeset
189 }
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lost@l-w.ca
parents: 85
diff changeset
190 lw_free(pp);
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lost@l-w.ca
parents: 85
diff changeset
191 }
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parents: 85
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192
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lost@l-w.ca
parents: 85
diff changeset
193 lw_free(ps);
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lost@l-w.ca
parents: 85
diff changeset
194 }
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parents: 85
diff changeset
195
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parents: 85
diff changeset
196 PARSEFUNC(pseudo_parse_starpragmapush)
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parents: 85
diff changeset
197 {
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diff changeset
198 char *ps, *t;
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lost@l-w.ca
parents: 85
diff changeset
199 char *pp;
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lost@l-w.ca
parents: 85
diff changeset
200 int i;
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lost@l-w.ca
parents: 85
diff changeset
201 const char *np;
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lost@l-w.ca
parents: 85
diff changeset
202 struct pragma_stack_entry *pse;
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lost@l-w.ca
parents: 85
diff changeset
203
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parents: 85
diff changeset
204 for (t = *p; *t && !isspace(*t); t++)
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parents: 85
diff changeset
205 /* do nothing */ ;
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lost@l-w.ca
parents: 85
diff changeset
206
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parents: 85
diff changeset
207 ps = lw_strndup(*p, t - *p);
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lost@l-w.ca
parents: 85
diff changeset
208 *p = t;
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lost@l-w.ca
parents: 85
diff changeset
209
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lost@l-w.ca
parents: 85
diff changeset
210 l -> len = 0;
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parents: 85
diff changeset
211
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
212 // *pragma stuff must never throw an error
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lost@l-w.ca
parents: 85
diff changeset
213 np = ps;
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lost@l-w.ca
parents: 85
diff changeset
214
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lost@l-w.ca
parents: 85
diff changeset
215 while (np)
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parents: 85
diff changeset
216 {
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lost@l-w.ca
parents: 85
diff changeset
217 pp = lw_token(np, ',', &np);
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lost@l-w.ca
parents: 85
diff changeset
218 for (i = 0; set_pragmas[i].setstr; i++)
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lost@l-w.ca
parents: 85
diff changeset
219 {
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lost@l-w.ca
parents: 85
diff changeset
220 if (!strcasecmp(pp, set_pragmas[i].setstr) || !strcasecmp(pp, set_pragmas[i].resetstr))
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lost@l-w.ca
parents: 85
diff changeset
221 {
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lost@l-w.ca
parents: 85
diff changeset
222 /* found set or reset pragma */
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lost@l-w.ca
parents: 85
diff changeset
223 /* push pragma state */
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lost@l-w.ca
parents: 85
diff changeset
224 if (as -> pragmas & (set_pragmas[i].flag))
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lost@l-w.ca
parents: 85
diff changeset
225 {
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lost@l-w.ca
parents: 85
diff changeset
226 /* use set string */
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lost@l-w.ca
parents: 85
diff changeset
227 t = (char *)set_pragmas[i].setstr;
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lost@l-w.ca
parents: 85
diff changeset
228 }
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lost@l-w.ca
parents: 85
diff changeset
229 else
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
230 {
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
231 /* use reset string */
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lost@l-w.ca
parents: 85
diff changeset
232 t = (char *)set_pragmas[i].resetstr;
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
233 }
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
234 pse = lw_alloc(sizeof(struct pragma_stack_entry) + strlen(t));
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lost@l-w.ca
parents: 85
diff changeset
235 pse -> flag = set_pragmas[i].flag;
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lost@l-w.ca
parents: 85
diff changeset
236 pse -> magic = 0x42424242;
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lost@l-w.ca
parents: 85
diff changeset
237 strcpy((char *)&(pse -> str), t);
110
38c1537857ce Pragma stack at parse stage now works
lost@l-w.ca
parents: 108
diff changeset
238 debug_message(as, 100, "Pushed pragma string %s", pse->str);
38c1537857ce Pragma stack at parse stage now works
lost@l-w.ca
parents: 108
diff changeset
239
108
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
240 input_stack_push(as, (input_stack_entry *)pse);
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lost@l-w.ca
parents: 85
diff changeset
241
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
242 if (set_pragmas[i].flag == PRAGMA_NOLIST)
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lost@l-w.ca
parents: 85
diff changeset
243 l -> pragmas |= PRAGMA_NOLIST;
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lost@l-w.ca
parents: 85
diff changeset
244 }
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
245 }
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
246 lw_free(pp);
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
247 }
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
248
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
249 lw_free(ps);
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lost@l-w.ca
parents: 85
diff changeset
250 }
9960e05cbe3a Added *pragmapush and *pragmapop; still seems to be nonfunctional
lost@l-w.ca
parents: 85
diff changeset
251