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1 /* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000-2018 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
35 /* All GPC versions until now (2007-09-27) also define a symbol called
36 '_p_initialize'. Check for the presence of this symbol first. */
37 static const char GPC_P_INITIALIZE[] = "_p_initialize";
38
39 /* The name of the symbol that GPC uses as the name of the main
40 procedure (since version 20050212). */
41 static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
42
43 /* Older versions of GPC (versions older than 20050212) were using
44 a different name for the main procedure. */
45 static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
46
47 /* Function returning the special symbol name used
48 by GPC for the main procedure in the main program
49 if it is found in minimal symbol list.
50 This function tries to find minimal symbols generated by GPC
51 so that it finds the even if the program was compiled
52 without debugging information.
53 According to information supplied by Waldeck Hebisch,
54 this should work for all versions posterior to June 2000. */
55
56 const char *
57 pascal_main_name (void)
58 {
59 struct bound_minimal_symbol msym;
60
61 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
62
63 /* If '_p_initialize' was not found, the main program is likely not
64 written in Pascal. */
65 if (msym.minsym == NULL)
66 return NULL;
67
68 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
69 if (msym.minsym != NULL)
70 {
71 return GPC_MAIN_PROGRAM_NAME_1;
72 }
73
74 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
75 if (msym.minsym != NULL)
76 {
77 return GPC_MAIN_PROGRAM_NAME_2;
78 }
79
80 /* No known entry procedure found, the main program is probably
81 not compiled with GPC. */
82 return NULL;
83 }
84
85 /* Determines if type TYPE is a pascal string type.
86 Returns a positive value if the type is a known pascal string type.
87 This function is used by p-valprint.c code to allow better string display.
88 If it is a pascal string type, then it also sets info needed
89 to get the length and the data of the string
90 length_pos, length_size and string_pos are given in bytes.
91 char_size gives the element size in bytes.
92 FIXME: if the position or the size of these fields
93 are not multiple of TARGET_CHAR_BIT then the results are wrong
94 but this does not happen for Free Pascal nor for GPC. */
95 int
96 is_pascal_string_type (struct type *type,int *length_pos,
97 int *length_size, int *string_pos,
98 struct type **char_type,
99 const char **arrayname)
100 {
101 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT)
102 {
103 /* Old Borland type pascal strings from Free Pascal Compiler. */
104 /* Two fields: length and st. */
105 if (TYPE_NFIELDS (type) == 2
106 && TYPE_FIELD_NAME (type, 0)
107 && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
108 && TYPE_FIELD_NAME (type, 1)
109 && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
110 {
111 if (length_pos)
112 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
113 if (length_size)
114 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
115 if (string_pos)
116 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
117 if (char_type)
118 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
119 if (arrayname)
120 *arrayname = TYPE_FIELD_NAME (type, 1);
121 return 2;
122 };
123 /* GNU pascal strings. */
124 /* Three fields: Capacity, length and schema$ or _p_schema. */
125 if (TYPE_NFIELDS (type) == 3
126 && TYPE_FIELD_NAME (type, 0)
127 && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
128 && TYPE_FIELD_NAME (type, 1)
129 && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
130 {
131 if (length_pos)
132 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
133 if (length_size)
134 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
135 if (string_pos)
136 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
137 /* FIXME: how can I detect wide chars in GPC ?? */
138 if (char_type)
139 {
140 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2));
141
142 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
143 *char_type = TYPE_TARGET_TYPE (*char_type);
144 }
145 if (arrayname)
146 *arrayname = TYPE_FIELD_NAME (type, 2);
147 return 3;
148 };
149 }
150 return 0;
151 }
152
153 static void pascal_one_char (int, struct ui_file *, int *);
154
155 /* Print the character C on STREAM as part of the contents of a literal
156 string.
157 In_quotes is reset to 0 if a char is written with #4 notation. */
158
159 static void
160 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
161 {
162 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
163 {
164 if (!(*in_quotes))
165 fputs_filtered ("'", stream);
166 *in_quotes = 1;
167 if (c == '\'')
168 {
169 fputs_filtered ("''", stream);
170 }
171 else
172 fprintf_filtered (stream, "%c", c);
173 }
174 else
175 {
176 if (*in_quotes)
177 fputs_filtered ("'", stream);
178 *in_quotes = 0;
179 fprintf_filtered (stream, "#%d", (unsigned int) c);
180 }
181 }
182
183 static void pascal_emit_char (int c, struct type *type,
184 struct ui_file *stream, int quoter);
185
186 /* Print the character C on STREAM as part of the contents of a literal
187 string whose delimiter is QUOTER. Note that that format for printing
188 characters and strings is language specific. */
189
190 static void
191 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
192 {
193 int in_quotes = 0;
194
195 pascal_one_char (c, stream, &in_quotes);
196 if (in_quotes)
197 fputs_filtered ("'", stream);
198 }
199
200 void
201 pascal_printchar (int c, struct type *type, struct ui_file *stream)
202 {
203 int in_quotes = 0;
204
205 pascal_one_char (c, stream, &in_quotes);
206 if (in_quotes)
207 fputs_filtered ("'", stream);
208 }
209
210 /* Print the character string STRING, printing at most LENGTH characters.
211 Printing stops early if the number hits print_max; repeat counts
212 are printed as appropriate. Print ellipses at the end if we
213 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
214
215 void
216 pascal_printstr (struct ui_file *stream, struct type *type,
217 const gdb_byte *string, unsigned int length,
218 const char *encoding, int force_ellipses,
219 const struct value_print_options *options)
220 {
221 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
222 unsigned int i;
223 unsigned int things_printed = 0;
224 int in_quotes = 0;
225 int need_comma = 0;
226 int width;
227
228 /* Preserve TYPE's original type, just set its LENGTH. */
229 check_typedef (type);
230 width = TYPE_LENGTH (type);
231
232 /* If the string was not truncated due to `set print elements', and
233 the last byte of it is a null, we don't print that, in traditional C
234 style. */
235 if ((!force_ellipses) && length > 0
236 && extract_unsigned_integer (string + (length - 1) * width, width,
237 byte_order) == 0)
238 length--;
239
240 if (length == 0)
241 {
242 fputs_filtered ("''", stream);
243 return;
244 }
245
246 for (i = 0; i < length && things_printed < options->print_max; ++i)
247 {
248 /* Position of the character we are examining
249 to see whether it is repeated. */
250 unsigned int rep1;
251 /* Number of repetitions we have detected so far. */
252 unsigned int reps;
253 unsigned long int current_char;
254
255 QUIT;
256
257 if (need_comma)
258 {
259 fputs_filtered (", ", stream);
260 need_comma = 0;
261 }
262
263 current_char = extract_unsigned_integer (string + i * width, width,
264 byte_order);
265
266 rep1 = i + 1;
267 reps = 1;
268 while (rep1 < length
269 && extract_unsigned_integer (string + rep1 * width, width,
270 byte_order) == current_char)
271 {
272 ++rep1;
273 ++reps;
274 }
275
276 if (reps > options->repeat_count_threshold)
277 {
278 if (in_quotes)
279 {
280 fputs_filtered ("', ", stream);
281 in_quotes = 0;
282 }
283 pascal_printchar (current_char, type, stream);
284 fprintf_filtered (stream, " <repeats %u times>", reps);
285 i = rep1 - 1;
286 things_printed += options->repeat_count_threshold;
287 need_comma = 1;
288 }
289 else
290 {
291 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
292 {
293 fputs_filtered ("'", stream);
294 in_quotes = 1;
295 }
296 pascal_one_char (current_char, stream, &in_quotes);
297 ++things_printed;
298 }
299 }
300
301 /* Terminate the quotes if necessary. */
302 if (in_quotes)
303 fputs_filtered ("'", stream);
304
305 if (force_ellipses || i < length)
306 fputs_filtered ("...", stream);
307 }
308 \f
309
310 /* Table mapping opcodes into strings for printing operators
311 and precedences of the operators. */
312
313 const struct op_print pascal_op_print_tab[] =
314 {
315 {",", BINOP_COMMA, PREC_COMMA, 0},
316 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
317 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
318 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
319 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
320 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
321 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
322 {"<=", BINOP_LEQ, PREC_ORDER, 0},
323 {">=", BINOP_GEQ, PREC_ORDER, 0},
324 {">", BINOP_GTR, PREC_ORDER, 0},
325 {"<", BINOP_LESS, PREC_ORDER, 0},
326 {"shr", BINOP_RSH, PREC_SHIFT, 0},
327 {"shl", BINOP_LSH, PREC_SHIFT, 0},
328 {"+", BINOP_ADD, PREC_ADD, 0},
329 {"-", BINOP_SUB, PREC_ADD, 0},
330 {"*", BINOP_MUL, PREC_MUL, 0},
331 {"/", BINOP_DIV, PREC_MUL, 0},
332 {"div", BINOP_INTDIV, PREC_MUL, 0},
333 {"mod", BINOP_REM, PREC_MUL, 0},
334 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
335 {"-", UNOP_NEG, PREC_PREFIX, 0},
336 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
337 {"^", UNOP_IND, PREC_SUFFIX, 1},
338 {"@", UNOP_ADDR, PREC_PREFIX, 0},
339 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
340 {NULL, OP_NULL, PREC_PREFIX, 0}
341 };
342 \f
343 enum pascal_primitive_types {
344 pascal_primitive_type_int,
345 pascal_primitive_type_long,
346 pascal_primitive_type_short,
347 pascal_primitive_type_char,
348 pascal_primitive_type_float,
349 pascal_primitive_type_double,
350 pascal_primitive_type_void,
351 pascal_primitive_type_long_long,
352 pascal_primitive_type_signed_char,
353 pascal_primitive_type_unsigned_char,
354 pascal_primitive_type_unsigned_short,
355 pascal_primitive_type_unsigned_int,
356 pascal_primitive_type_unsigned_long,
357 pascal_primitive_type_unsigned_long_long,
358 pascal_primitive_type_long_double,
359 pascal_primitive_type_complex,
360 pascal_primitive_type_double_complex,
361 nr_pascal_primitive_types
362 };
363
364 static void
365 pascal_language_arch_info (struct gdbarch *gdbarch,
366 struct language_arch_info *lai)
367 {
368 const struct builtin_type *builtin = builtin_type (gdbarch);
369
370 lai->string_char_type = builtin->builtin_char;
371 lai->primitive_type_vector
372 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
373 struct type *);
374 lai->primitive_type_vector [pascal_primitive_type_int]
375 = builtin->builtin_int;
376 lai->primitive_type_vector [pascal_primitive_type_long]
377 = builtin->builtin_long;
378 lai->primitive_type_vector [pascal_primitive_type_short]
379 = builtin->builtin_short;
380 lai->primitive_type_vector [pascal_primitive_type_char]
381 = builtin->builtin_char;
382 lai->primitive_type_vector [pascal_primitive_type_float]
383 = builtin->builtin_float;
384 lai->primitive_type_vector [pascal_primitive_type_double]
385 = builtin->builtin_double;
386 lai->primitive_type_vector [pascal_primitive_type_void]
387 = builtin->builtin_void;
388 lai->primitive_type_vector [pascal_primitive_type_long_long]
389 = builtin->builtin_long_long;
390 lai->primitive_type_vector [pascal_primitive_type_signed_char]
391 = builtin->builtin_signed_char;
392 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
393 = builtin->builtin_unsigned_char;
394 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
395 = builtin->builtin_unsigned_short;
396 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
397 = builtin->builtin_unsigned_int;
398 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
399 = builtin->builtin_unsigned_long;
400 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
401 = builtin->builtin_unsigned_long_long;
402 lai->primitive_type_vector [pascal_primitive_type_long_double]
403 = builtin->builtin_long_double;
404 lai->primitive_type_vector [pascal_primitive_type_complex]
405 = builtin->builtin_complex;
406 lai->primitive_type_vector [pascal_primitive_type_double_complex]
407 = builtin->builtin_double_complex;
408
409 lai->bool_type_symbol = "boolean";
410 lai->bool_type_default = builtin->builtin_bool;
411 }
412
413 static const char *p_extensions[] =
414 {
415 ".pas", ".p", ".pp", NULL
416 };
417
418 extern const struct language_defn pascal_language_defn =
419 {
420 "pascal", /* Language name */
421 "Pascal",
422 language_pascal,
423 range_check_on,
424 case_sensitive_on,
425 array_row_major,
426 macro_expansion_no,
427 p_extensions,
428 &exp_descriptor_standard,
429 pascal_parse,
430 pascal_yyerror,
431 null_post_parser,
432 pascal_printchar, /* Print a character constant */
433 pascal_printstr, /* Function to print string constant */
434 pascal_emit_char, /* Print a single char */
435 pascal_print_type, /* Print a type using appropriate syntax */
436 pascal_print_typedef, /* Print a typedef using appropriate syntax */
437 pascal_val_print, /* Print a value using appropriate syntax */
438 pascal_value_print, /* Print a top-level value */
439 default_read_var_value, /* la_read_var_value */
440 NULL, /* Language specific skip_trampoline */
441 "this", /* name_of_this */
442 false, /* la_store_sym_names_in_linkage_form_p */
443 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
444 basic_lookup_transparent_type,/* lookup_transparent_type */
445 NULL, /* Language specific symbol demangler */
446 NULL,
447 NULL, /* Language specific class_name_from_physname */
448 pascal_op_print_tab, /* expression operators for printing */
449 1, /* c-style arrays */
450 0, /* String lower bound */
451 default_word_break_characters,
452 default_collect_symbol_completion_matches,
453 pascal_language_arch_info,
454 default_print_array_index,
455 default_pass_by_reference,
456 default_get_string,
457 c_watch_location_expression,
458 NULL, /* la_compare_symbol_for_completion */
459 iterate_over_symbols,
460 default_search_name_hash,
461 &default_varobj_ops,
462 NULL,
463 NULL,
464 LANG_MAGIC
465 };