1 /* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000-2021 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 /* This file is derived from c-lang.c */
21
22 #include "defs.h"
23 #include "symtab.h"
24 #include "gdbtypes.h"
25 #include "expression.h"
26 #include "parser-defs.h"
27 #include "language.h"
28 #include "varobj.h"
29 #include "p-lang.h"
30 #include "valprint.h"
31 #include "value.h"
32 #include <ctype.h>
33 #include "c-lang.h"
34 #include "gdbarch.h"
35 #include "cli/cli-style.h"
36
37 /* All GPC versions until now (2007-09-27) also define a symbol called
38 '_p_initialize'. Check for the presence of this symbol first. */
39 static const char GPC_P_INITIALIZE[] = "_p_initialize";
40
41 /* The name of the symbol that GPC uses as the name of the main
42 procedure (since version 20050212). */
43 static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
44
45 /* Older versions of GPC (versions older than 20050212) were using
46 a different name for the main procedure. */
47 static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
48
49 /* Function returning the special symbol name used
50 by GPC for the main procedure in the main program
51 if it is found in minimal symbol list.
52 This function tries to find minimal symbols generated by GPC
53 so that it finds the even if the program was compiled
54 without debugging information.
55 According to information supplied by Waldeck Hebisch,
56 this should work for all versions posterior to June 2000. */
57
58 const char *
pascal_main_name(void)59 pascal_main_name (void)
60 {
61 struct bound_minimal_symbol msym;
62
63 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
64
65 /* If '_p_initialize' was not found, the main program is likely not
66 written in Pascal. */
67 if (msym.minsym == NULL)
68 return NULL;
69
70 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
71 if (msym.minsym != NULL)
72 {
73 return GPC_MAIN_PROGRAM_NAME_1;
74 }
75
76 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
77 if (msym.minsym != NULL)
78 {
79 return GPC_MAIN_PROGRAM_NAME_2;
80 }
81
82 /* No known entry procedure found, the main program is probably
83 not compiled with GPC. */
84 return NULL;
85 }
86
87 /* See p-lang.h. */
88
89 int
pascal_is_string_type(struct type * type,int * length_pos,int * length_size,int * string_pos,struct type ** char_type,const char ** arrayname)90 pascal_is_string_type (struct type *type,int *length_pos, int *length_size,
91 int *string_pos, struct type **char_type,
92 const char **arrayname)
93 {
94 if (type != NULL && type->code () == TYPE_CODE_STRUCT)
95 {
96 /* Old Borland type pascal strings from Free Pascal Compiler. */
97 /* Two fields: length and st. */
98 if (type->num_fields () == 2
99 && TYPE_FIELD_NAME (type, 0)
100 && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
101 && TYPE_FIELD_NAME (type, 1)
102 && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
103 {
104 if (length_pos)
105 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
106 if (length_size)
107 *length_size = TYPE_LENGTH (type->field (0).type ());
108 if (string_pos)
109 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
110 if (char_type)
111 *char_type = TYPE_TARGET_TYPE (type->field (1).type ());
112 if (arrayname)
113 *arrayname = TYPE_FIELD_NAME (type, 1);
114 return 2;
115 };
116 /* GNU pascal strings. */
117 /* Three fields: Capacity, length and schema$ or _p_schema. */
118 if (type->num_fields () == 3
119 && TYPE_FIELD_NAME (type, 0)
120 && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
121 && TYPE_FIELD_NAME (type, 1)
122 && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
123 {
124 if (length_pos)
125 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
126 if (length_size)
127 *length_size = TYPE_LENGTH (type->field (1).type ());
128 if (string_pos)
129 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
130 /* FIXME: how can I detect wide chars in GPC ?? */
131 if (char_type)
132 {
133 *char_type = TYPE_TARGET_TYPE (type->field (2).type ());
134
135 if ((*char_type)->code () == TYPE_CODE_ARRAY)
136 *char_type = TYPE_TARGET_TYPE (*char_type);
137 }
138 if (arrayname)
139 *arrayname = TYPE_FIELD_NAME (type, 2);
140 return 3;
141 };
142 }
143 return 0;
144 }
145
146 /* See p-lang.h. */
147
148 void
print_one_char(int c,struct ui_file * stream,int * in_quotes)149 pascal_language::print_one_char (int c, struct ui_file *stream,
150 int *in_quotes) const
151 {
152 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
153 {
154 if (!(*in_quotes))
155 fputs_filtered ("'", stream);
156 *in_quotes = 1;
157 if (c == '\'')
158 {
159 fputs_filtered ("''", stream);
160 }
161 else
162 fprintf_filtered (stream, "%c", c);
163 }
164 else
165 {
166 if (*in_quotes)
167 fputs_filtered ("'", stream);
168 *in_quotes = 0;
169 fprintf_filtered (stream, "#%d", (unsigned int) c);
170 }
171 }
172
173 /* See language.h. */
174
175 void
printchar(int c,struct type * type,struct ui_file * stream)176 pascal_language::printchar (int c, struct type *type,
177 struct ui_file *stream) const
178 {
179 int in_quotes = 0;
180
181 print_one_char (c, stream, &in_quotes);
182 if (in_quotes)
183 fputs_filtered ("'", stream);
184 }
185
186
187
188 /* See language.h. */
189
language_arch_info(struct gdbarch * gdbarch,struct language_arch_info * lai)190 void pascal_language::language_arch_info
191 (struct gdbarch *gdbarch, struct language_arch_info *lai) const
192 {
193 const struct builtin_type *builtin = builtin_type (gdbarch);
194
195 /* Helper function to allow shorter lines below. */
196 auto add = [&] (struct type * t)
197 {
198 lai->add_primitive_type (t);
199 };
200
201 add (builtin->builtin_int);
202 add (builtin->builtin_long);
203 add (builtin->builtin_short);
204 add (builtin->builtin_char);
205 add (builtin->builtin_float);
206 add (builtin->builtin_double);
207 add (builtin->builtin_void);
208 add (builtin->builtin_long_long);
209 add (builtin->builtin_signed_char);
210 add (builtin->builtin_unsigned_char);
211 add (builtin->builtin_unsigned_short);
212 add (builtin->builtin_unsigned_int);
213 add (builtin->builtin_unsigned_long);
214 add (builtin->builtin_unsigned_long_long);
215 add (builtin->builtin_long_double);
216 add (builtin->builtin_complex);
217 add (builtin->builtin_double_complex);
218
219 lai->set_string_char_type (builtin->builtin_char);
220 lai->set_bool_type (builtin->builtin_bool, "boolean");
221 }
222
223 /* See language.h. */
224
225 void
printstr(struct ui_file * stream,struct type * elttype,const gdb_byte * string,unsigned int length,const char * encoding,int force_ellipses,const struct value_print_options * options)226 pascal_language::printstr (struct ui_file *stream, struct type *elttype,
227 const gdb_byte *string, unsigned int length,
228 const char *encoding, int force_ellipses,
229 const struct value_print_options *options) const
230 {
231 enum bfd_endian byte_order = type_byte_order (elttype);
232 unsigned int i;
233 unsigned int things_printed = 0;
234 int in_quotes = 0;
235 int need_comma = 0;
236 int width;
237
238 /* Preserve ELTTYPE's original type, just set its LENGTH. */
239 check_typedef (elttype);
240 width = TYPE_LENGTH (elttype);
241
242 /* If the string was not truncated due to `set print elements', and
243 the last byte of it is a null, we don't print that, in traditional C
244 style. */
245 if ((!force_ellipses) && length > 0
246 && extract_unsigned_integer (string + (length - 1) * width, width,
247 byte_order) == 0)
248 length--;
249
250 if (length == 0)
251 {
252 fputs_filtered ("''", stream);
253 return;
254 }
255
256 for (i = 0; i < length && things_printed < options->print_max; ++i)
257 {
258 /* Position of the character we are examining
259 to see whether it is repeated. */
260 unsigned int rep1;
261 /* Number of repetitions we have detected so far. */
262 unsigned int reps;
263 unsigned long int current_char;
264
265 QUIT;
266
267 if (need_comma)
268 {
269 fputs_filtered (", ", stream);
270 need_comma = 0;
271 }
272
273 current_char = extract_unsigned_integer (string + i * width, width,
274 byte_order);
275
276 rep1 = i + 1;
277 reps = 1;
278 while (rep1 < length
279 && extract_unsigned_integer (string + rep1 * width, width,
280 byte_order) == current_char)
281 {
282 ++rep1;
283 ++reps;
284 }
285
286 if (reps > options->repeat_count_threshold)
287 {
288 if (in_quotes)
289 {
290 fputs_filtered ("', ", stream);
291 in_quotes = 0;
292 }
293 printchar (current_char, elttype, stream);
294 fprintf_filtered (stream, " %p[<repeats %u times>%p]",
295 metadata_style.style ().ptr (),
296 reps, nullptr);
297 i = rep1 - 1;
298 things_printed += options->repeat_count_threshold;
299 need_comma = 1;
300 }
301 else
302 {
303 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
304 {
305 fputs_filtered ("'", stream);
306 in_quotes = 1;
307 }
308 print_one_char (current_char, stream, &in_quotes);
309 ++things_printed;
310 }
311 }
312
313 /* Terminate the quotes if necessary. */
314 if (in_quotes)
315 fputs_filtered ("'", stream);
316
317 if (force_ellipses || i < length)
318 fputs_filtered ("...", stream);
319 }
320
321 /* Single instance of the Pascal language class. */
322
323 static pascal_language pascal_language_defn;
324