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1 /* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000, 2002, 2003, 2004, 2005, 2007, 2008
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 {
212 unsigned int i;
213 unsigned int things_printed = 0;
214 int in_quotes = 0;
215 int need_comma = 0;
216
217 /* If the string was not truncated due to `set print elements', and
218 the last byte of it is a null, we don't print that, in traditional C
219 style. */
220 if ((!force_ellipses) && length > 0 && string[length - 1] == '\0')
221 length--;
222
223 if (length == 0)
224 {
225 fputs_filtered ("''", stream);
226 return;
227 }
228
229 for (i = 0; i < length && things_printed < print_max; ++i)
230 {
231 /* Position of the character we are examining
232 to see whether it is repeated. */
233 unsigned int rep1;
234 /* Number of repetitions we have detected so far. */
235 unsigned int reps;
236
237 QUIT;
238
239 if (need_comma)
240 {
241 fputs_filtered (", ", stream);
242 need_comma = 0;
243 }
244
245 rep1 = i + 1;
246 reps = 1;
247 while (rep1 < length && string[rep1] == string[i])
248 {
249 ++rep1;
250 ++reps;
251 }
252
253 if (reps > repeat_count_threshold)
254 {
255 if (in_quotes)
256 {
257 if (inspect_it)
258 fputs_filtered ("\\', ", stream);
259 else
260 fputs_filtered ("', ", stream);
261 in_quotes = 0;
262 }
263 pascal_printchar (string[i], stream);
264 fprintf_filtered (stream, " <repeats %u times>", reps);
265 i = rep1 - 1;
266 things_printed += repeat_count_threshold;
267 need_comma = 1;
268 }
269 else
270 {
271 int c = string[i];
272 if ((!in_quotes) && (PRINT_LITERAL_FORM (c)))
273 {
274 if (inspect_it)
275 fputs_filtered ("\\'", stream);
276 else
277 fputs_filtered ("'", stream);
278 in_quotes = 1;
279 }
280 pascal_one_char (c, stream, &in_quotes);
281 ++things_printed;
282 }
283 }
284
285 /* Terminate the quotes if necessary. */
286 if (in_quotes)
287 {
288 if (inspect_it)
289 fputs_filtered ("\\'", stream);
290 else
291 fputs_filtered ("'", stream);
292 }
293
294 if (force_ellipses || i < length)
295 fputs_filtered ("...", stream);
296 }
297 \f
298
299 /* Table mapping opcodes into strings for printing operators
300 and precedences of the operators. */
301
302 const struct op_print pascal_op_print_tab[] =
303 {
304 {",", BINOP_COMMA, PREC_COMMA, 0},
305 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
306 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
307 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
308 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
309 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
310 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
311 {"<=", BINOP_LEQ, PREC_ORDER, 0},
312 {">=", BINOP_GEQ, PREC_ORDER, 0},
313 {">", BINOP_GTR, PREC_ORDER, 0},
314 {"<", BINOP_LESS, PREC_ORDER, 0},
315 {"shr", BINOP_RSH, PREC_SHIFT, 0},
316 {"shl", BINOP_LSH, PREC_SHIFT, 0},
317 {"+", BINOP_ADD, PREC_ADD, 0},
318 {"-", BINOP_SUB, PREC_ADD, 0},
319 {"*", BINOP_MUL, PREC_MUL, 0},
320 {"/", BINOP_DIV, PREC_MUL, 0},
321 {"div", BINOP_INTDIV, PREC_MUL, 0},
322 {"mod", BINOP_REM, PREC_MUL, 0},
323 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
324 {"-", UNOP_NEG, PREC_PREFIX, 0},
325 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
326 {"^", UNOP_IND, PREC_SUFFIX, 1},
327 {"@", UNOP_ADDR, PREC_PREFIX, 0},
328 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
329 {NULL, 0, 0, 0}
330 };
331 \f
332 enum pascal_primitive_types {
333 pascal_primitive_type_int,
334 pascal_primitive_type_long,
335 pascal_primitive_type_short,
336 pascal_primitive_type_char,
337 pascal_primitive_type_float,
338 pascal_primitive_type_double,
339 pascal_primitive_type_void,
340 pascal_primitive_type_long_long,
341 pascal_primitive_type_signed_char,
342 pascal_primitive_type_unsigned_char,
343 pascal_primitive_type_unsigned_short,
344 pascal_primitive_type_unsigned_int,
345 pascal_primitive_type_unsigned_long,
346 pascal_primitive_type_unsigned_long_long,
347 pascal_primitive_type_long_double,
348 pascal_primitive_type_complex,
349 pascal_primitive_type_double_complex,
350 nr_pascal_primitive_types
351 };
352
353 static void
354 pascal_language_arch_info (struct gdbarch *gdbarch,
355 struct language_arch_info *lai)
356 {
357 const struct builtin_type *builtin = builtin_type (gdbarch);
358 lai->string_char_type = builtin->builtin_char;
359 lai->primitive_type_vector
360 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
361 struct type *);
362 lai->primitive_type_vector [pascal_primitive_type_int]
363 = builtin->builtin_int;
364 lai->primitive_type_vector [pascal_primitive_type_long]
365 = builtin->builtin_long;
366 lai->primitive_type_vector [pascal_primitive_type_short]
367 = builtin->builtin_short;
368 lai->primitive_type_vector [pascal_primitive_type_char]
369 = builtin->builtin_char;
370 lai->primitive_type_vector [pascal_primitive_type_float]
371 = builtin->builtin_float;
372 lai->primitive_type_vector [pascal_primitive_type_double]
373 = builtin->builtin_double;
374 lai->primitive_type_vector [pascal_primitive_type_void]
375 = builtin->builtin_void;
376 lai->primitive_type_vector [pascal_primitive_type_long_long]
377 = builtin->builtin_long_long;
378 lai->primitive_type_vector [pascal_primitive_type_signed_char]
379 = builtin->builtin_signed_char;
380 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
381 = builtin->builtin_unsigned_char;
382 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
383 = builtin->builtin_unsigned_short;
384 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
385 = builtin->builtin_unsigned_int;
386 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
387 = builtin->builtin_unsigned_long;
388 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
389 = builtin->builtin_unsigned_long_long;
390 lai->primitive_type_vector [pascal_primitive_type_long_double]
391 = builtin->builtin_long_double;
392 lai->primitive_type_vector [pascal_primitive_type_complex]
393 = builtin->builtin_complex;
394 lai->primitive_type_vector [pascal_primitive_type_double_complex]
395 = builtin->builtin_double_complex;
396 }
397
398 const struct language_defn pascal_language_defn =
399 {
400 "pascal", /* Language name */
401 language_pascal,
402 range_check_on,
403 type_check_on,
404 case_sensitive_on,
405 array_row_major,
406 &exp_descriptor_standard,
407 pascal_parse,
408 pascal_error,
409 null_post_parser,
410 pascal_printchar, /* Print a character constant */
411 pascal_printstr, /* Function to print string constant */
412 pascal_emit_char, /* Print a single char */
413 pascal_print_type, /* Print a type using appropriate syntax */
414 pascal_val_print, /* Print a value using appropriate syntax */
415 pascal_value_print, /* Print a top-level value */
416 NULL, /* Language specific skip_trampoline */
417 value_of_this, /* value_of_this */
418 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
419 basic_lookup_transparent_type,/* lookup_transparent_type */
420 NULL, /* Language specific symbol demangler */
421 NULL, /* Language specific class_name_from_physname */
422 pascal_op_print_tab, /* expression operators for printing */
423 1, /* c-style arrays */
424 0, /* String lower bound */
425 default_word_break_characters,
426 pascal_language_arch_info,
427 default_print_array_index,
428 default_pass_by_reference,
429 LANG_MAGIC
430 };
431
432 void
433 _initialize_pascal_language (void)
434 {
435 add_language (&pascal_language_defn);
436 }