]> git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/p-lang.c
2009-02-05 Thiago Jung Bauermann <bauerman@br.ibm.com>
[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 1 if the type is a known pascal 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 if (length_pos)
130 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
131 if (length_size)
132 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
133 if (string_pos)
134 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
135 /* FIXME: how can I detect wide chars in GPC ?? */
136 if (char_size)
137 *char_size = 1;
138 if (arrayname)
139 *arrayname = TYPE_FIELDS (type)[2].name;
140 return 3;
141 };
142 }
143 return 0;
144 }
145
146 static void pascal_one_char (int, struct ui_file *, int *);
147
148 /* Print the character C on STREAM as part of the contents of a literal
149 string.
150 In_quotes is reset to 0 if a char is written with #4 notation */
151
152 static void
153 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
154 {
155
156 c &= 0xFF; /* Avoid sign bit follies */
157
158 if ((c == '\'') || (PRINT_LITERAL_FORM (c)))
159 {
160 if (!(*in_quotes))
161 fputs_filtered ("'", stream);
162 *in_quotes = 1;
163 if (c == '\'')
164 {
165 fputs_filtered ("''", stream);
166 }
167 else
168 fprintf_filtered (stream, "%c", c);
169 }
170 else
171 {
172 if (*in_quotes)
173 fputs_filtered ("'", stream);
174 *in_quotes = 0;
175 fprintf_filtered (stream, "#%d", (unsigned int) c);
176 }
177 }
178
179 static void pascal_emit_char (int c, struct ui_file *stream, int quoter);
180
181 /* Print the character C on STREAM as part of the contents of a literal
182 string whose delimiter is QUOTER. Note that that format for printing
183 characters and strings is language specific. */
184
185 static void
186 pascal_emit_char (int c, struct ui_file *stream, int quoter)
187 {
188 int in_quotes = 0;
189 pascal_one_char (c, stream, &in_quotes);
190 if (in_quotes)
191 fputs_filtered ("'", stream);
192 }
193
194 void
195 pascal_printchar (int c, struct ui_file *stream)
196 {
197 int in_quotes = 0;
198 pascal_one_char (c, stream, &in_quotes);
199 if (in_quotes)
200 fputs_filtered ("'", stream);
201 }
202
203 /* Print the character string STRING, printing at most LENGTH characters.
204 Printing stops early if the number hits print_max; repeat counts
205 are printed as appropriate. Print ellipses at the end if we
206 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
207
208 void
209 pascal_printstr (struct ui_file *stream, const gdb_byte *string,
210 unsigned int length, int width, int force_ellipses,
211 const struct value_print_options *options)
212 {
213 unsigned int i;
214 unsigned int things_printed = 0;
215 int in_quotes = 0;
216 int need_comma = 0;
217
218 /* If the string was not truncated due to `set print elements', and
219 the last byte of it is a null, we don't print that, in traditional C
220 style. */
221 if ((!force_ellipses) && length > 0 && string[length - 1] == '\0')
222 length--;
223
224 if (length == 0)
225 {
226 fputs_filtered ("''", stream);
227 return;
228 }
229
230 for (i = 0; i < length && things_printed < options->print_max; ++i)
231 {
232 /* Position of the character we are examining
233 to see whether it is repeated. */
234 unsigned int rep1;
235 /* Number of repetitions we have detected so far. */
236 unsigned int reps;
237
238 QUIT;
239
240 if (need_comma)
241 {
242 fputs_filtered (", ", stream);
243 need_comma = 0;
244 }
245
246 rep1 = i + 1;
247 reps = 1;
248 while (rep1 < length && string[rep1] == string[i])
249 {
250 ++rep1;
251 ++reps;
252 }
253
254 if (reps > options->repeat_count_threshold)
255 {
256 if (in_quotes)
257 {
258 if (options->inspect_it)
259 fputs_filtered ("\\', ", stream);
260 else
261 fputs_filtered ("', ", stream);
262 in_quotes = 0;
263 }
264 pascal_printchar (string[i], stream);
265 fprintf_filtered (stream, " <repeats %u times>", reps);
266 i = rep1 - 1;
267 things_printed += options->repeat_count_threshold;
268 need_comma = 1;
269 }
270 else
271 {
272 int c = string[i];
273 if ((!in_quotes) && (PRINT_LITERAL_FORM (c)))
274 {
275 if (options->inspect_it)
276 fputs_filtered ("\\'", stream);
277 else
278 fputs_filtered ("'", stream);
279 in_quotes = 1;
280 }
281 pascal_one_char (c, stream, &in_quotes);
282 ++things_printed;
283 }
284 }
285
286 /* Terminate the quotes if necessary. */
287 if (in_quotes)
288 {
289 if (options->inspect_it)
290 fputs_filtered ("\\'", stream);
291 else
292 fputs_filtered ("'", stream);
293 }
294
295 if (force_ellipses || i < length)
296 fputs_filtered ("...", stream);
297 }
298 \f
299
300 /* Table mapping opcodes into strings for printing operators
301 and precedences of the operators. */
302
303 const struct op_print pascal_op_print_tab[] =
304 {
305 {",", BINOP_COMMA, PREC_COMMA, 0},
306 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
307 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
308 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
309 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
310 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
311 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
312 {"<=", BINOP_LEQ, PREC_ORDER, 0},
313 {">=", BINOP_GEQ, PREC_ORDER, 0},
314 {">", BINOP_GTR, PREC_ORDER, 0},
315 {"<", BINOP_LESS, PREC_ORDER, 0},
316 {"shr", BINOP_RSH, PREC_SHIFT, 0},
317 {"shl", BINOP_LSH, PREC_SHIFT, 0},
318 {"+", BINOP_ADD, PREC_ADD, 0},
319 {"-", BINOP_SUB, PREC_ADD, 0},
320 {"*", BINOP_MUL, PREC_MUL, 0},
321 {"/", BINOP_DIV, PREC_MUL, 0},
322 {"div", BINOP_INTDIV, PREC_MUL, 0},
323 {"mod", BINOP_REM, PREC_MUL, 0},
324 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
325 {"-", UNOP_NEG, PREC_PREFIX, 0},
326 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
327 {"^", UNOP_IND, PREC_SUFFIX, 1},
328 {"@", UNOP_ADDR, PREC_PREFIX, 0},
329 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
330 {NULL, 0, 0, 0}
331 };
332 \f
333 enum pascal_primitive_types {
334 pascal_primitive_type_int,
335 pascal_primitive_type_long,
336 pascal_primitive_type_short,
337 pascal_primitive_type_char,
338 pascal_primitive_type_float,
339 pascal_primitive_type_double,
340 pascal_primitive_type_void,
341 pascal_primitive_type_long_long,
342 pascal_primitive_type_signed_char,
343 pascal_primitive_type_unsigned_char,
344 pascal_primitive_type_unsigned_short,
345 pascal_primitive_type_unsigned_int,
346 pascal_primitive_type_unsigned_long,
347 pascal_primitive_type_unsigned_long_long,
348 pascal_primitive_type_long_double,
349 pascal_primitive_type_complex,
350 pascal_primitive_type_double_complex,
351 nr_pascal_primitive_types
352 };
353
354 static void
355 pascal_language_arch_info (struct gdbarch *gdbarch,
356 struct language_arch_info *lai)
357 {
358 const struct builtin_type *builtin = builtin_type (gdbarch);
359 lai->string_char_type = builtin->builtin_char;
360 lai->primitive_type_vector
361 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
362 struct type *);
363 lai->primitive_type_vector [pascal_primitive_type_int]
364 = builtin->builtin_int;
365 lai->primitive_type_vector [pascal_primitive_type_long]
366 = builtin->builtin_long;
367 lai->primitive_type_vector [pascal_primitive_type_short]
368 = builtin->builtin_short;
369 lai->primitive_type_vector [pascal_primitive_type_char]
370 = builtin->builtin_char;
371 lai->primitive_type_vector [pascal_primitive_type_float]
372 = builtin->builtin_float;
373 lai->primitive_type_vector [pascal_primitive_type_double]
374 = builtin->builtin_double;
375 lai->primitive_type_vector [pascal_primitive_type_void]
376 = builtin->builtin_void;
377 lai->primitive_type_vector [pascal_primitive_type_long_long]
378 = builtin->builtin_long_long;
379 lai->primitive_type_vector [pascal_primitive_type_signed_char]
380 = builtin->builtin_signed_char;
381 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
382 = builtin->builtin_unsigned_char;
383 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
384 = builtin->builtin_unsigned_short;
385 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
386 = builtin->builtin_unsigned_int;
387 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
388 = builtin->builtin_unsigned_long;
389 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
390 = builtin->builtin_unsigned_long_long;
391 lai->primitive_type_vector [pascal_primitive_type_long_double]
392 = builtin->builtin_long_double;
393 lai->primitive_type_vector [pascal_primitive_type_complex]
394 = builtin->builtin_complex;
395 lai->primitive_type_vector [pascal_primitive_type_double_complex]
396 = builtin->builtin_double_complex;
397
398 lai->bool_type_symbol = "boolean";
399 lai->bool_type_default = builtin->builtin_bool;
400 }
401
402 const struct language_defn pascal_language_defn =
403 {
404 "pascal", /* Language name */
405 language_pascal,
406 range_check_on,
407 type_check_on,
408 case_sensitive_on,
409 array_row_major,
410 macro_expansion_no,
411 &exp_descriptor_standard,
412 pascal_parse,
413 pascal_error,
414 null_post_parser,
415 pascal_printchar, /* Print a character constant */
416 pascal_printstr, /* Function to print string constant */
417 pascal_emit_char, /* Print a single char */
418 pascal_print_type, /* Print a type using appropriate syntax */
419 pascal_print_typedef, /* Print a typedef using appropriate syntax */
420 pascal_val_print, /* Print a value using appropriate syntax */
421 pascal_value_print, /* Print a top-level value */
422 NULL, /* Language specific skip_trampoline */
423 "this", /* name_of_this */
424 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
425 basic_lookup_transparent_type,/* lookup_transparent_type */
426 NULL, /* Language specific symbol demangler */
427 NULL, /* Language specific class_name_from_physname */
428 pascal_op_print_tab, /* expression operators for printing */
429 1, /* c-style arrays */
430 0, /* String lower bound */
431 default_word_break_characters,
432 default_make_symbol_completion_list,
433 pascal_language_arch_info,
434 default_print_array_index,
435 default_pass_by_reference,
436 default_get_string,
437 LANG_MAGIC
438 };
439
440 void
441 _initialize_pascal_language (void)
442 {
443 add_language (&pascal_language_defn);
444 }