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1 /* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000-2014 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 <string.h>
24 #include "symtab.h"
25 #include "gdbtypes.h"
26 #include "expression.h"
27 #include "parser-defs.h"
28 #include "language.h"
29 #include "varobj.h"
30 #include "p-lang.h"
31 #include "valprint.h"
32 #include "value.h"
33 #include <ctype.h>
34
35 extern void _initialize_pascal_language (void);
36
37
38 /* All GPC versions until now (2007-09-27) also define a symbol called
39 '_p_initialize'. Check for the presence of this symbol first. */
40 static const char GPC_P_INITIALIZE[] = "_p_initialize";
41
42 /* The name of the symbol that GPC uses as the name of the main
43 procedure (since version 20050212). */
44 static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
45
46 /* Older versions of GPC (versions older than 20050212) were using
47 a different name for the main procedure. */
48 static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
49
50 /* Function returning the special symbol name used
51 by GPC for the main procedure in the main program
52 if it is found in minimal symbol list.
53 This function tries to find minimal symbols generated by GPC
54 so that it finds the even if the program was compiled
55 without debugging information.
56 According to information supplied by Waldeck Hebisch,
57 this should work for all versions posterior to June 2000. */
58
59 const char *
60 pascal_main_name (void)
61 {
62 struct minimal_symbol *msym;
63
64 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
65
66 /* If '_p_initialize' was not found, the main program is likely not
67 written in Pascal. */
68 if (msym == NULL)
69 return NULL;
70
71 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
72 if (msym != NULL)
73 {
74 return GPC_MAIN_PROGRAM_NAME_1;
75 }
76
77 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
78 if (msym != NULL)
79 {
80 return GPC_MAIN_PROGRAM_NAME_2;
81 }
82
83 /* No known entry procedure found, the main program is probably
84 not compiled with GPC. */
85 return NULL;
86 }
87
88 /* Determines if type TYPE is a pascal string type.
89 Returns a positive value if the type is a known pascal string type.
90 This function is used by p-valprint.c code to allow better string display.
91 If it is a pascal string type, then it also sets info needed
92 to get the length and the data of the string
93 length_pos, length_size and string_pos are given in bytes.
94 char_size gives the element size in bytes.
95 FIXME: if the position or the size of these fields
96 are not multiple of TARGET_CHAR_BIT then the results are wrong
97 but this does not happen for Free Pascal nor for GPC. */
98 int
99 is_pascal_string_type (struct type *type,int *length_pos,
100 int *length_size, int *string_pos,
101 struct type **char_type,
102 const char **arrayname)
103 {
104 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT)
105 {
106 /* Old Borland type pascal strings from Free Pascal Compiler. */
107 /* Two fields: length and st. */
108 if (TYPE_NFIELDS (type) == 2
109 && TYPE_FIELD_NAME (type, 0)
110 && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
111 && TYPE_FIELD_NAME (type, 1)
112 && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
113 {
114 if (length_pos)
115 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
116 if (length_size)
117 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
118 if (string_pos)
119 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
120 if (char_type)
121 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
122 if (arrayname)
123 *arrayname = TYPE_FIELD_NAME (type, 1);
124 return 2;
125 };
126 /* GNU pascal strings. */
127 /* Three fields: Capacity, length and schema$ or _p_schema. */
128 if (TYPE_NFIELDS (type) == 3
129 && TYPE_FIELD_NAME (type, 0)
130 && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
131 && TYPE_FIELD_NAME (type, 1)
132 && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
133 {
134 if (length_pos)
135 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
136 if (length_size)
137 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
138 if (string_pos)
139 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
140 /* FIXME: how can I detect wide chars in GPC ?? */
141 if (char_type)
142 {
143 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2));
144
145 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
146 *char_type = TYPE_TARGET_TYPE (*char_type);
147 }
148 if (arrayname)
149 *arrayname = TYPE_FIELD_NAME (type, 2);
150 return 3;
151 };
152 }
153 return 0;
154 }
155
156 static void pascal_one_char (int, struct ui_file *, int *);
157
158 /* Print the character C on STREAM as part of the contents of a literal
159 string.
160 In_quotes is reset to 0 if a char is written with #4 notation. */
161
162 static void
163 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
164 {
165 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
166 {
167 if (!(*in_quotes))
168 fputs_filtered ("'", stream);
169 *in_quotes = 1;
170 if (c == '\'')
171 {
172 fputs_filtered ("''", stream);
173 }
174 else
175 fprintf_filtered (stream, "%c", c);
176 }
177 else
178 {
179 if (*in_quotes)
180 fputs_filtered ("'", stream);
181 *in_quotes = 0;
182 fprintf_filtered (stream, "#%d", (unsigned int) c);
183 }
184 }
185
186 static void pascal_emit_char (int c, struct type *type,
187 struct ui_file *stream, int quoter);
188
189 /* Print the character C on STREAM as part of the contents of a literal
190 string whose delimiter is QUOTER. Note that that format for printing
191 characters and strings is language specific. */
192
193 static void
194 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
195 {
196 int in_quotes = 0;
197
198 pascal_one_char (c, stream, &in_quotes);
199 if (in_quotes)
200 fputs_filtered ("'", stream);
201 }
202
203 void
204 pascal_printchar (int c, struct type *type, struct ui_file *stream)
205 {
206 int in_quotes = 0;
207
208 pascal_one_char (c, stream, &in_quotes);
209 if (in_quotes)
210 fputs_filtered ("'", stream);
211 }
212
213 /* Print the character string STRING, printing at most LENGTH characters.
214 Printing stops early if the number hits print_max; repeat counts
215 are printed as appropriate. Print ellipses at the end if we
216 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
217
218 void
219 pascal_printstr (struct ui_file *stream, struct type *type,
220 const gdb_byte *string, unsigned int length,
221 const char *encoding, int force_ellipses,
222 const struct value_print_options *options)
223 {
224 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
225 unsigned int i;
226 unsigned int things_printed = 0;
227 int in_quotes = 0;
228 int need_comma = 0;
229 int width;
230
231 /* Preserve TYPE's original type, just set its LENGTH. */
232 check_typedef (type);
233 width = TYPE_LENGTH (type);
234
235 /* If the string was not truncated due to `set print elements', and
236 the last byte of it is a null, we don't print that, in traditional C
237 style. */
238 if ((!force_ellipses) && length > 0
239 && extract_unsigned_integer (string + (length - 1) * width, width,
240 byte_order) == 0)
241 length--;
242
243 if (length == 0)
244 {
245 fputs_filtered ("''", stream);
246 return;
247 }
248
249 for (i = 0; i < length && things_printed < options->print_max; ++i)
250 {
251 /* Position of the character we are examining
252 to see whether it is repeated. */
253 unsigned int rep1;
254 /* Number of repetitions we have detected so far. */
255 unsigned int reps;
256 unsigned long int current_char;
257
258 QUIT;
259
260 if (need_comma)
261 {
262 fputs_filtered (", ", stream);
263 need_comma = 0;
264 }
265
266 current_char = extract_unsigned_integer (string + i * width, width,
267 byte_order);
268
269 rep1 = i + 1;
270 reps = 1;
271 while (rep1 < length
272 && extract_unsigned_integer (string + rep1 * width, width,
273 byte_order) == current_char)
274 {
275 ++rep1;
276 ++reps;
277 }
278
279 if (reps > options->repeat_count_threshold)
280 {
281 if (in_quotes)
282 {
283 fputs_filtered ("', ", stream);
284 in_quotes = 0;
285 }
286 pascal_printchar (current_char, type, stream);
287 fprintf_filtered (stream, " <repeats %u times>", reps);
288 i = rep1 - 1;
289 things_printed += options->repeat_count_threshold;
290 need_comma = 1;
291 }
292 else
293 {
294 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
295 {
296 fputs_filtered ("'", stream);
297 in_quotes = 1;
298 }
299 pascal_one_char (current_char, stream, &in_quotes);
300 ++things_printed;
301 }
302 }
303
304 /* Terminate the quotes if necessary. */
305 if (in_quotes)
306 fputs_filtered ("'", stream);
307
308 if (force_ellipses || i < length)
309 fputs_filtered ("...", stream);
310 }
311 \f
312
313 /* Table mapping opcodes into strings for printing operators
314 and precedences of the operators. */
315
316 const struct op_print pascal_op_print_tab[] =
317 {
318 {",", BINOP_COMMA, PREC_COMMA, 0},
319 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
320 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
321 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
322 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
323 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
324 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
325 {"<=", BINOP_LEQ, PREC_ORDER, 0},
326 {">=", BINOP_GEQ, PREC_ORDER, 0},
327 {">", BINOP_GTR, PREC_ORDER, 0},
328 {"<", BINOP_LESS, PREC_ORDER, 0},
329 {"shr", BINOP_RSH, PREC_SHIFT, 0},
330 {"shl", BINOP_LSH, PREC_SHIFT, 0},
331 {"+", BINOP_ADD, PREC_ADD, 0},
332 {"-", BINOP_SUB, PREC_ADD, 0},
333 {"*", BINOP_MUL, PREC_MUL, 0},
334 {"/", BINOP_DIV, PREC_MUL, 0},
335 {"div", BINOP_INTDIV, PREC_MUL, 0},
336 {"mod", BINOP_REM, PREC_MUL, 0},
337 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
338 {"-", UNOP_NEG, PREC_PREFIX, 0},
339 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
340 {"^", UNOP_IND, PREC_SUFFIX, 1},
341 {"@", UNOP_ADDR, PREC_PREFIX, 0},
342 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
343 {NULL, 0, 0, 0}
344 };
345 \f
346 enum pascal_primitive_types {
347 pascal_primitive_type_int,
348 pascal_primitive_type_long,
349 pascal_primitive_type_short,
350 pascal_primitive_type_char,
351 pascal_primitive_type_float,
352 pascal_primitive_type_double,
353 pascal_primitive_type_void,
354 pascal_primitive_type_long_long,
355 pascal_primitive_type_signed_char,
356 pascal_primitive_type_unsigned_char,
357 pascal_primitive_type_unsigned_short,
358 pascal_primitive_type_unsigned_int,
359 pascal_primitive_type_unsigned_long,
360 pascal_primitive_type_unsigned_long_long,
361 pascal_primitive_type_long_double,
362 pascal_primitive_type_complex,
363 pascal_primitive_type_double_complex,
364 nr_pascal_primitive_types
365 };
366
367 static void
368 pascal_language_arch_info (struct gdbarch *gdbarch,
369 struct language_arch_info *lai)
370 {
371 const struct builtin_type *builtin = builtin_type (gdbarch);
372
373 lai->string_char_type = builtin->builtin_char;
374 lai->primitive_type_vector
375 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
376 struct type *);
377 lai->primitive_type_vector [pascal_primitive_type_int]
378 = builtin->builtin_int;
379 lai->primitive_type_vector [pascal_primitive_type_long]
380 = builtin->builtin_long;
381 lai->primitive_type_vector [pascal_primitive_type_short]
382 = builtin->builtin_short;
383 lai->primitive_type_vector [pascal_primitive_type_char]
384 = builtin->builtin_char;
385 lai->primitive_type_vector [pascal_primitive_type_float]
386 = builtin->builtin_float;
387 lai->primitive_type_vector [pascal_primitive_type_double]
388 = builtin->builtin_double;
389 lai->primitive_type_vector [pascal_primitive_type_void]
390 = builtin->builtin_void;
391 lai->primitive_type_vector [pascal_primitive_type_long_long]
392 = builtin->builtin_long_long;
393 lai->primitive_type_vector [pascal_primitive_type_signed_char]
394 = builtin->builtin_signed_char;
395 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
396 = builtin->builtin_unsigned_char;
397 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
398 = builtin->builtin_unsigned_short;
399 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
400 = builtin->builtin_unsigned_int;
401 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
402 = builtin->builtin_unsigned_long;
403 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
404 = builtin->builtin_unsigned_long_long;
405 lai->primitive_type_vector [pascal_primitive_type_long_double]
406 = builtin->builtin_long_double;
407 lai->primitive_type_vector [pascal_primitive_type_complex]
408 = builtin->builtin_complex;
409 lai->primitive_type_vector [pascal_primitive_type_double_complex]
410 = builtin->builtin_double_complex;
411
412 lai->bool_type_symbol = "boolean";
413 lai->bool_type_default = builtin->builtin_bool;
414 }
415
416 const struct language_defn pascal_language_defn =
417 {
418 "pascal", /* Language name */
419 "Pascal",
420 language_pascal,
421 range_check_on,
422 case_sensitive_on,
423 array_row_major,
424 macro_expansion_no,
425 &exp_descriptor_standard,
426 pascal_parse,
427 pascal_error,
428 null_post_parser,
429 pascal_printchar, /* Print a character constant */
430 pascal_printstr, /* Function to print string constant */
431 pascal_emit_char, /* Print a single char */
432 pascal_print_type, /* Print a type using appropriate syntax */
433 pascal_print_typedef, /* Print a typedef using appropriate syntax */
434 pascal_val_print, /* Print a value using appropriate syntax */
435 pascal_value_print, /* Print a top-level value */
436 default_read_var_value, /* la_read_var_value */
437 NULL, /* Language specific skip_trampoline */
438 "this", /* name_of_this */
439 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
440 basic_lookup_transparent_type,/* lookup_transparent_type */
441 NULL, /* Language specific symbol demangler */
442 NULL, /* Language specific class_name_from_physname */
443 pascal_op_print_tab, /* expression operators for printing */
444 1, /* c-style arrays */
445 0, /* String lower bound */
446 default_word_break_characters,
447 default_make_symbol_completion_list,
448 pascal_language_arch_info,
449 default_print_array_index,
450 default_pass_by_reference,
451 default_get_string,
452 NULL, /* la_get_symbol_name_cmp */
453 iterate_over_symbols,
454 &default_varobj_ops,
455 LANG_MAGIC
456 };
457
458 void
459 _initialize_pascal_language (void)
460 {
461 add_language (&pascal_language_defn);
462 }