1 /* Pascal language support routines for GDB, the GNU debugger.
3 Copyright (C) 2000-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 /* This file is derived from c-lang.c */
26 #include "expression.h"
27 #include "parser-defs.h"
35 extern void _initialize_pascal_language (void);
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";
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";
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";
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. */
60 pascal_main_name (void)
62 struct minimal_symbol
*msym
;
64 msym
= lookup_minimal_symbol (GPC_P_INITIALIZE
, NULL
, NULL
);
66 /* If '_p_initialize' was not found, the main program is likely not
71 msym
= lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1
, NULL
, NULL
);
74 return GPC_MAIN_PROGRAM_NAME_1
;
77 msym
= lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2
, NULL
, NULL
);
80 return GPC_MAIN_PROGRAM_NAME_2
;
83 /* No known entry procedure found, the main program is probably
84 not compiled with GPC. */
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. */
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
)
104 if (type
!= NULL
&& TYPE_CODE (type
) == TYPE_CODE_STRUCT
)
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)
115 *length_pos
= TYPE_FIELD_BITPOS (type
, 0) / TARGET_CHAR_BIT
;
117 *length_size
= TYPE_LENGTH (TYPE_FIELD_TYPE (type
, 0));
119 *string_pos
= TYPE_FIELD_BITPOS (type
, 1) / TARGET_CHAR_BIT
;
121 *char_type
= TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type
, 1));
123 *arrayname
= TYPE_FIELD_NAME (type
, 1);
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)
135 *length_pos
= TYPE_FIELD_BITPOS (type
, 1) / TARGET_CHAR_BIT
;
137 *length_size
= TYPE_LENGTH (TYPE_FIELD_TYPE (type
, 1));
139 *string_pos
= TYPE_FIELD_BITPOS (type
, 2) / TARGET_CHAR_BIT
;
140 /* FIXME: how can I detect wide chars in GPC ?? */
143 *char_type
= TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type
, 2));
145 if (TYPE_CODE (*char_type
) == TYPE_CODE_ARRAY
)
146 *char_type
= TYPE_TARGET_TYPE (*char_type
);
149 *arrayname
= TYPE_FIELD_NAME (type
, 2);
156 static void pascal_one_char (int, struct ui_file
*, int *);
158 /* Print the character C on STREAM as part of the contents of a literal
160 In_quotes is reset to 0 if a char is written with #4 notation. */
163 pascal_one_char (int c
, struct ui_file
*stream
, int *in_quotes
)
165 if (c
== '\'' || ((unsigned int) c
<= 0xff && (PRINT_LITERAL_FORM (c
))))
168 fputs_filtered ("'", stream
);
172 fputs_filtered ("''", stream
);
175 fprintf_filtered (stream
, "%c", c
);
180 fputs_filtered ("'", stream
);
182 fprintf_filtered (stream
, "#%d", (unsigned int) c
);
186 static void pascal_emit_char (int c
, struct type
*type
,
187 struct ui_file
*stream
, int quoter
);
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. */
194 pascal_emit_char (int c
, struct type
*type
, struct ui_file
*stream
, int quoter
)
198 pascal_one_char (c
, stream
, &in_quotes
);
200 fputs_filtered ("'", stream
);
204 pascal_printchar (int c
, struct type
*type
, struct ui_file
*stream
)
208 pascal_one_char (c
, stream
, &in_quotes
);
210 fputs_filtered ("'", stream
);
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. */
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
)
224 enum bfd_endian byte_order
= gdbarch_byte_order (get_type_arch (type
));
226 unsigned int things_printed
= 0;
231 /* Preserve TYPE's original type, just set its LENGTH. */
232 check_typedef (type
);
233 width
= TYPE_LENGTH (type
);
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
238 if ((!force_ellipses
) && length
> 0
239 && extract_unsigned_integer (string
+ (length
- 1) * width
, width
,
245 fputs_filtered ("''", stream
);
249 for (i
= 0; i
< length
&& things_printed
< options
->print_max
; ++i
)
251 /* Position of the character we are examining
252 to see whether it is repeated. */
254 /* Number of repetitions we have detected so far. */
256 unsigned long int current_char
;
262 fputs_filtered (", ", stream
);
266 current_char
= extract_unsigned_integer (string
+ i
* width
, width
,
272 && extract_unsigned_integer (string
+ rep1
* width
, width
,
273 byte_order
) == current_char
)
279 if (reps
> options
->repeat_count_threshold
)
283 fputs_filtered ("', ", stream
);
286 pascal_printchar (current_char
, type
, stream
);
287 fprintf_filtered (stream
, " <repeats %u times>", reps
);
289 things_printed
+= options
->repeat_count_threshold
;
294 if ((!in_quotes
) && (PRINT_LITERAL_FORM (current_char
)))
296 fputs_filtered ("'", stream
);
299 pascal_one_char (current_char
, stream
, &in_quotes
);
304 /* Terminate the quotes if necessary. */
306 fputs_filtered ("'", stream
);
308 if (force_ellipses
|| i
< length
)
309 fputs_filtered ("...", stream
);
313 /* Table mapping opcodes into strings for printing operators
314 and precedences of the operators. */
316 const struct op_print pascal_op_print_tab
[] =
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},
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
368 pascal_language_arch_info (struct gdbarch
*gdbarch
,
369 struct language_arch_info
*lai
)
371 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
373 lai
->string_char_type
= builtin
->builtin_char
;
374 lai
->primitive_type_vector
375 = GDBARCH_OBSTACK_CALLOC (gdbarch
, nr_pascal_primitive_types
+ 1,
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
;
412 lai
->bool_type_symbol
= "boolean";
413 lai
->bool_type_default
= builtin
->builtin_bool
;
416 const struct language_defn pascal_language_defn
=
418 "pascal", /* Language name */
425 &exp_descriptor_standard
,
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
,
452 NULL
, /* la_get_symbol_name_cmp */
453 iterate_over_symbols
,
459 _initialize_pascal_language (void)
461 add_language (&pascal_language_defn
);