1 /* Pascal language support routines for GDB, the GNU debugger.
3 Copyright (C) 2000-2020 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 */
25 #include "expression.h"
26 #include "parser-defs.h"
35 #include "cli/cli-style.h"
37 /* All GPC versions until now (2007-09-27) also define a symbol called
38 '_p_initialize'. Check for the presence of this symbol first. */
39 static const char GPC_P_INITIALIZE
[] = "_p_initialize";
41 /* The name of the symbol that GPC uses as the name of the main
42 procedure (since version 20050212). */
43 static const char GPC_MAIN_PROGRAM_NAME_1
[] = "_p__M0_main_program";
45 /* Older versions of GPC (versions older than 20050212) were using
46 a different name for the main procedure. */
47 static const char GPC_MAIN_PROGRAM_NAME_2
[] = "pascal_main_program";
49 /* Function returning the special symbol name used
50 by GPC for the main procedure in the main program
51 if it is found in minimal symbol list.
52 This function tries to find minimal symbols generated by GPC
53 so that it finds the even if the program was compiled
54 without debugging information.
55 According to information supplied by Waldeck Hebisch,
56 this should work for all versions posterior to June 2000. */
59 pascal_main_name (void)
61 struct bound_minimal_symbol msym
;
63 msym
= lookup_minimal_symbol (GPC_P_INITIALIZE
, NULL
, NULL
);
65 /* If '_p_initialize' was not found, the main program is likely not
67 if (msym
.minsym
== NULL
)
70 msym
= lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1
, NULL
, NULL
);
71 if (msym
.minsym
!= NULL
)
73 return GPC_MAIN_PROGRAM_NAME_1
;
76 msym
= lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2
, NULL
, NULL
);
77 if (msym
.minsym
!= NULL
)
79 return GPC_MAIN_PROGRAM_NAME_2
;
82 /* No known entry procedure found, the main program is probably
83 not compiled with GPC. */
87 /* Determines if type TYPE is a pascal string type.
88 Returns a positive value if the type is a known pascal string type.
89 This function is used by p-valprint.c code to allow better string display.
90 If it is a pascal string type, then it also sets info needed
91 to get the length and the data of the string
92 length_pos, length_size and string_pos are given in bytes.
93 char_size gives the element size in bytes.
94 FIXME: if the position or the size of these fields
95 are not multiple of TARGET_CHAR_BIT then the results are wrong
96 but this does not happen for Free Pascal nor for GPC. */
98 is_pascal_string_type (struct type
*type
,int *length_pos
,
99 int *length_size
, int *string_pos
,
100 struct type
**char_type
,
101 const char **arrayname
)
103 if (type
!= NULL
&& type
->code () == TYPE_CODE_STRUCT
)
105 /* Old Borland type pascal strings from Free Pascal Compiler. */
106 /* Two fields: length and st. */
107 if (type
->num_fields () == 2
108 && TYPE_FIELD_NAME (type
, 0)
109 && strcmp (TYPE_FIELD_NAME (type
, 0), "length") == 0
110 && TYPE_FIELD_NAME (type
, 1)
111 && strcmp (TYPE_FIELD_NAME (type
, 1), "st") == 0)
114 *length_pos
= TYPE_FIELD_BITPOS (type
, 0) / TARGET_CHAR_BIT
;
116 *length_size
= TYPE_LENGTH (type
->field (0).type ());
118 *string_pos
= TYPE_FIELD_BITPOS (type
, 1) / TARGET_CHAR_BIT
;
120 *char_type
= TYPE_TARGET_TYPE (type
->field (1).type ());
122 *arrayname
= TYPE_FIELD_NAME (type
, 1);
125 /* GNU pascal strings. */
126 /* Three fields: Capacity, length and schema$ or _p_schema. */
127 if (type
->num_fields () == 3
128 && TYPE_FIELD_NAME (type
, 0)
129 && strcmp (TYPE_FIELD_NAME (type
, 0), "Capacity") == 0
130 && TYPE_FIELD_NAME (type
, 1)
131 && strcmp (TYPE_FIELD_NAME (type
, 1), "length") == 0)
134 *length_pos
= TYPE_FIELD_BITPOS (type
, 1) / TARGET_CHAR_BIT
;
136 *length_size
= TYPE_LENGTH (type
->field (1).type ());
138 *string_pos
= TYPE_FIELD_BITPOS (type
, 2) / TARGET_CHAR_BIT
;
139 /* FIXME: how can I detect wide chars in GPC ?? */
142 *char_type
= TYPE_TARGET_TYPE (type
->field (2).type ());
144 if ((*char_type
)->code () == TYPE_CODE_ARRAY
)
145 *char_type
= TYPE_TARGET_TYPE (*char_type
);
148 *arrayname
= TYPE_FIELD_NAME (type
, 2);
155 /* This is a wrapper around IS_PASCAL_STRING_TYPE that returns true if TYPE
159 pascal_is_string_type_p (struct type
*type
)
161 return is_pascal_string_type (type
, nullptr, nullptr, nullptr,
162 nullptr, nullptr) > 0;
165 static void pascal_one_char (int, struct ui_file
*, int *);
167 /* Print the character C on STREAM as part of the contents of a literal
169 In_quotes is reset to 0 if a char is written with #4 notation. */
172 pascal_one_char (int c
, struct ui_file
*stream
, int *in_quotes
)
174 if (c
== '\'' || ((unsigned int) c
<= 0xff && (PRINT_LITERAL_FORM (c
))))
177 fputs_filtered ("'", stream
);
181 fputs_filtered ("''", stream
);
184 fprintf_filtered (stream
, "%c", c
);
189 fputs_filtered ("'", stream
);
191 fprintf_filtered (stream
, "#%d", (unsigned int) c
);
195 static void pascal_emit_char (int c
, struct type
*type
,
196 struct ui_file
*stream
, int quoter
);
198 /* Print the character C on STREAM as part of the contents of a literal
199 string whose delimiter is QUOTER. Note that that format for printing
200 characters and strings is language specific. */
203 pascal_emit_char (int c
, struct type
*type
, struct ui_file
*stream
, int quoter
)
207 pascal_one_char (c
, stream
, &in_quotes
);
209 fputs_filtered ("'", stream
);
213 pascal_printchar (int c
, struct type
*type
, struct ui_file
*stream
)
217 pascal_one_char (c
, stream
, &in_quotes
);
219 fputs_filtered ("'", stream
);
222 /* Print the character string STRING, printing at most LENGTH characters.
223 Printing stops early if the number hits print_max; repeat counts
224 are printed as appropriate. Print ellipses at the end if we
225 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
228 pascal_printstr (struct ui_file
*stream
, struct type
*type
,
229 const gdb_byte
*string
, unsigned int length
,
230 const char *encoding
, int force_ellipses
,
231 const struct value_print_options
*options
)
233 enum bfd_endian byte_order
= type_byte_order (type
);
235 unsigned int things_printed
= 0;
240 /* Preserve TYPE's original type, just set its LENGTH. */
241 check_typedef (type
);
242 width
= TYPE_LENGTH (type
);
244 /* If the string was not truncated due to `set print elements', and
245 the last byte of it is a null, we don't print that, in traditional C
247 if ((!force_ellipses
) && length
> 0
248 && extract_unsigned_integer (string
+ (length
- 1) * width
, width
,
254 fputs_filtered ("''", stream
);
258 for (i
= 0; i
< length
&& things_printed
< options
->print_max
; ++i
)
260 /* Position of the character we are examining
261 to see whether it is repeated. */
263 /* Number of repetitions we have detected so far. */
265 unsigned long int current_char
;
271 fputs_filtered (", ", stream
);
275 current_char
= extract_unsigned_integer (string
+ i
* width
, width
,
281 && extract_unsigned_integer (string
+ rep1
* width
, width
,
282 byte_order
) == current_char
)
288 if (reps
> options
->repeat_count_threshold
)
292 fputs_filtered ("', ", stream
);
295 pascal_printchar (current_char
, type
, stream
);
296 fprintf_filtered (stream
, " %p[<repeats %u times>%p]",
297 metadata_style
.style ().ptr (),
300 things_printed
+= options
->repeat_count_threshold
;
305 if ((!in_quotes
) && (PRINT_LITERAL_FORM (current_char
)))
307 fputs_filtered ("'", stream
);
310 pascal_one_char (current_char
, stream
, &in_quotes
);
315 /* Terminate the quotes if necessary. */
317 fputs_filtered ("'", stream
);
319 if (force_ellipses
|| i
< length
)
320 fputs_filtered ("...", stream
);
324 /* Table mapping opcodes into strings for printing operators
325 and precedences of the operators. */
327 const struct op_print pascal_op_print_tab
[] =
329 {",", BINOP_COMMA
, PREC_COMMA
, 0},
330 {":=", BINOP_ASSIGN
, PREC_ASSIGN
, 1},
331 {"or", BINOP_BITWISE_IOR
, PREC_BITWISE_IOR
, 0},
332 {"xor", BINOP_BITWISE_XOR
, PREC_BITWISE_XOR
, 0},
333 {"and", BINOP_BITWISE_AND
, PREC_BITWISE_AND
, 0},
334 {"=", BINOP_EQUAL
, PREC_EQUAL
, 0},
335 {"<>", BINOP_NOTEQUAL
, PREC_EQUAL
, 0},
336 {"<=", BINOP_LEQ
, PREC_ORDER
, 0},
337 {">=", BINOP_GEQ
, PREC_ORDER
, 0},
338 {">", BINOP_GTR
, PREC_ORDER
, 0},
339 {"<", BINOP_LESS
, PREC_ORDER
, 0},
340 {"shr", BINOP_RSH
, PREC_SHIFT
, 0},
341 {"shl", BINOP_LSH
, PREC_SHIFT
, 0},
342 {"+", BINOP_ADD
, PREC_ADD
, 0},
343 {"-", BINOP_SUB
, PREC_ADD
, 0},
344 {"*", BINOP_MUL
, PREC_MUL
, 0},
345 {"/", BINOP_DIV
, PREC_MUL
, 0},
346 {"div", BINOP_INTDIV
, PREC_MUL
, 0},
347 {"mod", BINOP_REM
, PREC_MUL
, 0},
348 {"@", BINOP_REPEAT
, PREC_REPEAT
, 0},
349 {"-", UNOP_NEG
, PREC_PREFIX
, 0},
350 {"not", UNOP_LOGICAL_NOT
, PREC_PREFIX
, 0},
351 {"^", UNOP_IND
, PREC_SUFFIX
, 1},
352 {"@", UNOP_ADDR
, PREC_PREFIX
, 0},
353 {"sizeof", UNOP_SIZEOF
, PREC_PREFIX
, 0},
354 {NULL
, OP_NULL
, PREC_PREFIX
, 0}
357 enum pascal_primitive_types
{
358 pascal_primitive_type_int
,
359 pascal_primitive_type_long
,
360 pascal_primitive_type_short
,
361 pascal_primitive_type_char
,
362 pascal_primitive_type_float
,
363 pascal_primitive_type_double
,
364 pascal_primitive_type_void
,
365 pascal_primitive_type_long_long
,
366 pascal_primitive_type_signed_char
,
367 pascal_primitive_type_unsigned_char
,
368 pascal_primitive_type_unsigned_short
,
369 pascal_primitive_type_unsigned_int
,
370 pascal_primitive_type_unsigned_long
,
371 pascal_primitive_type_unsigned_long_long
,
372 pascal_primitive_type_long_double
,
373 pascal_primitive_type_complex
,
374 pascal_primitive_type_double_complex
,
375 nr_pascal_primitive_types
378 static const char *p_extensions
[] =
380 ".pas", ".p", ".pp", NULL
383 /* Constant data representing the Pascal language. */
385 extern const struct language_data pascal_language_data
=
387 "pascal", /* Language name */
395 &exp_descriptor_standard
,
397 pascal_printchar
, /* Print a character constant */
398 pascal_printstr
, /* Function to print string constant */
399 pascal_emit_char
, /* Print a single char */
400 pascal_print_typedef
, /* Print a typedef using appropriate syntax */
401 "this", /* name_of_this */
402 false, /* la_store_sym_names_in_linkage_form_p */
403 pascal_op_print_tab
, /* expression operators for printing */
404 1, /* c-style arrays */
405 0, /* String lower bound */
407 pascal_is_string_type_p
,
408 "{...}" /* la_struct_too_deep_ellipsis */
411 /* Class representing the Pascal language. */
413 class pascal_language
: public language_defn
417 : language_defn (language_pascal
, pascal_language_data
)
420 /* See language.h. */
421 void language_arch_info (struct gdbarch
*gdbarch
,
422 struct language_arch_info
*lai
) const override
424 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
426 lai
->string_char_type
= builtin
->builtin_char
;
427 lai
->primitive_type_vector
428 = GDBARCH_OBSTACK_CALLOC (gdbarch
, nr_pascal_primitive_types
+ 1,
430 lai
->primitive_type_vector
[pascal_primitive_type_int
]
431 = builtin
->builtin_int
;
432 lai
->primitive_type_vector
[pascal_primitive_type_long
]
433 = builtin
->builtin_long
;
434 lai
->primitive_type_vector
[pascal_primitive_type_short
]
435 = builtin
->builtin_short
;
436 lai
->primitive_type_vector
[pascal_primitive_type_char
]
437 = builtin
->builtin_char
;
438 lai
->primitive_type_vector
[pascal_primitive_type_float
]
439 = builtin
->builtin_float
;
440 lai
->primitive_type_vector
[pascal_primitive_type_double
]
441 = builtin
->builtin_double
;
442 lai
->primitive_type_vector
[pascal_primitive_type_void
]
443 = builtin
->builtin_void
;
444 lai
->primitive_type_vector
[pascal_primitive_type_long_long
]
445 = builtin
->builtin_long_long
;
446 lai
->primitive_type_vector
[pascal_primitive_type_signed_char
]
447 = builtin
->builtin_signed_char
;
448 lai
->primitive_type_vector
[pascal_primitive_type_unsigned_char
]
449 = builtin
->builtin_unsigned_char
;
450 lai
->primitive_type_vector
[pascal_primitive_type_unsigned_short
]
451 = builtin
->builtin_unsigned_short
;
452 lai
->primitive_type_vector
[pascal_primitive_type_unsigned_int
]
453 = builtin
->builtin_unsigned_int
;
454 lai
->primitive_type_vector
[pascal_primitive_type_unsigned_long
]
455 = builtin
->builtin_unsigned_long
;
456 lai
->primitive_type_vector
[pascal_primitive_type_unsigned_long_long
]
457 = builtin
->builtin_unsigned_long_long
;
458 lai
->primitive_type_vector
[pascal_primitive_type_long_double
]
459 = builtin
->builtin_long_double
;
460 lai
->primitive_type_vector
[pascal_primitive_type_complex
]
461 = builtin
->builtin_complex
;
462 lai
->primitive_type_vector
[pascal_primitive_type_double_complex
]
463 = builtin
->builtin_double_complex
;
465 lai
->bool_type_symbol
= "boolean";
466 lai
->bool_type_default
= builtin
->builtin_bool
;
469 /* See language.h. */
471 void print_type (struct type
*type
, const char *varstring
,
472 struct ui_file
*stream
, int show
, int level
,
473 const struct type_print_options
*flags
) const override
475 pascal_print_type (type
, varstring
, stream
, show
, level
, flags
);
478 /* See language.h. */
480 void value_print (struct value
*val
, struct ui_file
*stream
,
481 const struct value_print_options
*options
) const override
483 return pascal_value_print (val
, stream
, options
);
486 /* See language.h. */
488 void value_print_inner
489 (struct value
*val
, struct ui_file
*stream
, int recurse
,
490 const struct value_print_options
*options
) const override
492 return pascal_value_print_inner (val
, stream
, recurse
, options
);
495 /* See language.h. */
497 int parser (struct parser_state
*ps
) const override
499 return pascal_parse (ps
);
503 /* Single instance of the Pascal language class. */
505 static pascal_language pascal_language_defn
;