]> git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/p-lang.c
2009-02-10 Pierre Muller <muller@ics.u-strasbg.fr>
[thirdparty/binutils-gdb.git] / gdb / p-lang.c
1 /* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21 /* This file is derived from c-lang.c */
22
23 #include "defs.h"
24 #include "gdb_string.h"
25 #include "symtab.h"
26 #include "gdbtypes.h"
27 #include "expression.h"
28 #include "parser-defs.h"
29 #include "language.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, int *char_size,
101 char **arrayname)
102 {
103 if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
104 {
105 /* Old Borland type pascal strings from Free Pascal Compiler. */
106 /* Two fields: length and st. */
107 if (TYPE_NFIELDS (type) == 2
108 && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0
109 && strcmp (TYPE_FIELDS (type)[1].name, "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_size)
118 *char_size = 1;
119 if (arrayname)
120 *arrayname = TYPE_FIELDS (type)[1].name;
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 && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0
127 && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0)
128 {
129 struct type *char_type;
130 if (length_pos)
131 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
132 if (length_size)
133 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
134 if (string_pos)
135 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
136 /* FIXME: how can I detect wide chars in GPC ?? */
137 char_type = TYPE_FIELD_TYPE (type,2);
138 if (char_size && TYPE_CODE (char_type) == TYPE_CODE_ARRAY)
139 {
140 *char_size = TYPE_LENGTH (TYPE_TARGET_TYPE (char_type));
141 }
142 else if (char_size)
143 *char_size = 1;
144 if (arrayname)
145 *arrayname = TYPE_FIELDS (type)[2].name;
146 return 3;
147 };
148 }
149 return 0;
150 }
151
152 static void pascal_one_char (int, struct ui_file *, int *);
153
154 /* Print the character C on STREAM as part of the contents of a literal
155 string.
156 In_quotes is reset to 0 if a char is written with #4 notation */
157
158 static void
159 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
160 {
161
162 c &= 0xFF; /* Avoid sign bit follies */
163
164 if ((c == '\'') || (PRINT_LITERAL_FORM (c)))
165 {
166 if (!(*in_quotes))
167 fputs_filtered ("'", stream);
168 *in_quotes = 1;
169 if (c == '\'')
170 {
171 fputs_filtered ("''", stream);
172 }
173 else
174 fprintf_filtered (stream, "%c", c);
175 }
176 else
177 {
178 if (*in_quotes)
179 fputs_filtered ("'", stream);
180 *in_quotes = 0;
181 fprintf_filtered (stream, "#%d", (unsigned int) c);
182 }
183 }
184
185 static void pascal_emit_char (int c, struct ui_file *stream, int quoter);
186
187 /* Print the character C on STREAM as part of the contents of a literal
188 string whose delimiter is QUOTER. Note that that format for printing
189 characters and strings is language specific. */
190
191 static void
192 pascal_emit_char (int c, struct ui_file *stream, int quoter)
193 {
194 int in_quotes = 0;
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 ui_file *stream)
202 {
203 int in_quotes = 0;
204 pascal_one_char (c, stream, &in_quotes);
205 if (in_quotes)
206 fputs_filtered ("'", stream);
207 }
208
209 /* Print the character string STRING, printing at most LENGTH characters.
210 Printing stops early if the number hits print_max; repeat counts
211 are printed as appropriate. Print ellipses at the end if we
212 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
213
214 void
215 pascal_printstr (struct ui_file *stream, const gdb_byte *string,
216 unsigned int length, int width, int force_ellipses,
217 const struct value_print_options *options)
218 {
219 unsigned int i;
220 unsigned int things_printed = 0;
221 int in_quotes = 0;
222 int need_comma = 0;
223
224 /* If the string was not truncated due to `set print elements', and
225 the last byte of it is a null, we don't print that, in traditional C
226 style. */
227 if ((!force_ellipses) && length > 0
228 && extract_unsigned_integer (string + (length - 1) * width, width) == 0)
229 length--;
230
231 if (length == 0)
232 {
233 fputs_filtered ("''", stream);
234 return;
235 }
236
237 for (i = 0; i < length && things_printed < options->print_max; ++i)
238 {
239 /* Position of the character we are examining
240 to see whether it is repeated. */
241 unsigned int rep1;
242 /* Number of repetitions we have detected so far. */
243 unsigned int reps;
244 unsigned long int current_char;
245
246 QUIT;
247
248 if (need_comma)
249 {
250 fputs_filtered (", ", stream);
251 need_comma = 0;
252 }
253
254 current_char = extract_unsigned_integer (string + i * width, width);
255
256 rep1 = i + 1;
257 reps = 1;
258 while (rep1 < length
259 && extract_unsigned_integer (string + rep1 * width, width)
260 == current_char)
261 {
262 ++rep1;
263 ++reps;
264 }
265
266 if (reps > options->repeat_count_threshold)
267 {
268 if (in_quotes)
269 {
270 if (options->inspect_it)
271 fputs_filtered ("\\', ", stream);
272 else
273 fputs_filtered ("', ", stream);
274 in_quotes = 0;
275 }
276 pascal_printchar (current_char, stream);
277 fprintf_filtered (stream, " <repeats %u times>", reps);
278 i = rep1 - 1;
279 things_printed += options->repeat_count_threshold;
280 need_comma = 1;
281 }
282 else
283 {
284 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
285 {
286 if (options->inspect_it)
287 fputs_filtered ("\\'", stream);
288 else
289 fputs_filtered ("'", stream);
290 in_quotes = 1;
291 }
292 pascal_one_char (current_char, stream, &in_quotes);
293 ++things_printed;
294 }
295 }
296
297 /* Terminate the quotes if necessary. */
298 if (in_quotes)
299 {
300 if (options->inspect_it)
301 fputs_filtered ("\\'", stream);
302 else
303 fputs_filtered ("'", stream);
304 }
305
306 if (force_ellipses || i < length)
307 fputs_filtered ("...", stream);
308 }
309 \f
310
311 /* Table mapping opcodes into strings for printing operators
312 and precedences of the operators. */
313
314 const struct op_print pascal_op_print_tab[] =
315 {
316 {",", BINOP_COMMA, PREC_COMMA, 0},
317 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
318 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
319 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
320 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
321 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
322 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
323 {"<=", BINOP_LEQ, PREC_ORDER, 0},
324 {">=", BINOP_GEQ, PREC_ORDER, 0},
325 {">", BINOP_GTR, PREC_ORDER, 0},
326 {"<", BINOP_LESS, PREC_ORDER, 0},
327 {"shr", BINOP_RSH, PREC_SHIFT, 0},
328 {"shl", BINOP_LSH, PREC_SHIFT, 0},
329 {"+", BINOP_ADD, PREC_ADD, 0},
330 {"-", BINOP_SUB, PREC_ADD, 0},
331 {"*", BINOP_MUL, PREC_MUL, 0},
332 {"/", BINOP_DIV, PREC_MUL, 0},
333 {"div", BINOP_INTDIV, PREC_MUL, 0},
334 {"mod", BINOP_REM, PREC_MUL, 0},
335 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
336 {"-", UNOP_NEG, PREC_PREFIX, 0},
337 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
338 {"^", UNOP_IND, PREC_SUFFIX, 1},
339 {"@", UNOP_ADDR, PREC_PREFIX, 0},
340 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
341 {NULL, 0, 0, 0}
342 };
343 \f
344 enum pascal_primitive_types {
345 pascal_primitive_type_int,
346 pascal_primitive_type_long,
347 pascal_primitive_type_short,
348 pascal_primitive_type_char,
349 pascal_primitive_type_float,
350 pascal_primitive_type_double,
351 pascal_primitive_type_void,
352 pascal_primitive_type_long_long,
353 pascal_primitive_type_signed_char,
354 pascal_primitive_type_unsigned_char,
355 pascal_primitive_type_unsigned_short,
356 pascal_primitive_type_unsigned_int,
357 pascal_primitive_type_unsigned_long,
358 pascal_primitive_type_unsigned_long_long,
359 pascal_primitive_type_long_double,
360 pascal_primitive_type_complex,
361 pascal_primitive_type_double_complex,
362 nr_pascal_primitive_types
363 };
364
365 static void
366 pascal_language_arch_info (struct gdbarch *gdbarch,
367 struct language_arch_info *lai)
368 {
369 const struct builtin_type *builtin = builtin_type (gdbarch);
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 const struct language_defn pascal_language_defn =
414 {
415 "pascal", /* Language name */
416 language_pascal,
417 range_check_on,
418 type_check_on,
419 case_sensitive_on,
420 array_row_major,
421 macro_expansion_no,
422 &exp_descriptor_standard,
423 pascal_parse,
424 pascal_error,
425 null_post_parser,
426 pascal_printchar, /* Print a character constant */
427 pascal_printstr, /* Function to print string constant */
428 pascal_emit_char, /* Print a single char */
429 pascal_print_type, /* Print a type using appropriate syntax */
430 pascal_print_typedef, /* Print a typedef using appropriate syntax */
431 pascal_val_print, /* Print a value using appropriate syntax */
432 pascal_value_print, /* Print a top-level value */
433 NULL, /* Language specific skip_trampoline */
434 "this", /* name_of_this */
435 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
436 basic_lookup_transparent_type,/* lookup_transparent_type */
437 NULL, /* Language specific symbol demangler */
438 NULL, /* Language specific class_name_from_physname */
439 pascal_op_print_tab, /* expression operators for printing */
440 1, /* c-style arrays */
441 0, /* String lower bound */
442 default_word_break_characters,
443 default_make_symbol_completion_list,
444 pascal_language_arch_info,
445 default_print_array_index,
446 default_pass_by_reference,
447 default_get_string,
448 LANG_MAGIC
449 };
450
451 void
452 _initialize_pascal_language (void)
453 {
454 add_language (&pascal_language_defn);
455 }