1 /* Pascal language support routines for GDB, the GNU debugger.
3 Copyright (C) 2000-2015 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"
34 extern void _initialize_pascal_language (void);
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) == TYPE_CODE_STRUCT)
105 /* Old Borland type pascal strings from Free Pascal Compiler. */
106 /* Two fields: length and st. */
107 if (TYPE_NFIELDS (type) == 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_TYPE (type, 0));
118 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
120 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
122 *arrayname = TYPE_FIELD_NAME (type, 1);
125 /* GNU pascal strings. */
126 /* Three fields: Capacity, length and schema$ or _p_schema. */
127 if (TYPE_NFIELDS (type) == 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_TYPE (type, 1));
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_TYPE (type, 2));
144 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
145 *char_type = TYPE_TARGET_TYPE (*char_type);
148 *arrayname = TYPE_FIELD_NAME (type, 2);
155 static void pascal_one_char (int, struct ui_file *, int *);
157 /* Print the character C on STREAM as part of the contents of a literal
159 In_quotes is reset to 0 if a char is written with #4 notation. */
162 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
164 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
167 fputs_filtered ("'", stream);
171 fputs_filtered ("''", stream);
174 fprintf_filtered (stream, "%c", c);
179 fputs_filtered ("'", stream);
181 fprintf_filtered (stream, "#%d", (unsigned int) c);
185 static void pascal_emit_char (int c, struct type *type,
186 struct ui_file *stream, int quoter);
188 /* Print the character C on STREAM as part of the contents of a literal
189 string whose delimiter is QUOTER. Note that that format for printing
190 characters and strings is language specific. */
193 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
197 pascal_one_char (c, stream, &in_quotes);
199 fputs_filtered ("'", stream);
203 pascal_printchar (int c, struct type *type, struct ui_file *stream)
207 pascal_one_char (c, stream, &in_quotes);
209 fputs_filtered ("'", stream);
212 /* Print the character string STRING, printing at most LENGTH characters.
213 Printing stops early if the number hits print_max; repeat counts
214 are printed as appropriate. Print ellipses at the end if we
215 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
218 pascal_printstr (struct ui_file *stream, struct type *type,
219 const gdb_byte *string, unsigned int length,
220 const char *encoding, int force_ellipses,
221 const struct value_print_options *options)
223 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
225 unsigned int things_printed = 0;
230 /* Preserve TYPE's original type, just set its LENGTH. */
231 check_typedef (type);
232 width = TYPE_LENGTH (type);
234 /* If the string was not truncated due to `set print elements', and
235 the last byte of it is a null, we don't print that, in traditional C
237 if ((!force_ellipses) && length > 0
238 && extract_unsigned_integer (string + (length - 1) * width, width,
244 fputs_filtered ("''", stream);
248 for (i = 0; i < length && things_printed < options->print_max; ++i)
250 /* Position of the character we are examining
251 to see whether it is repeated. */
253 /* Number of repetitions we have detected so far. */
255 unsigned long int current_char;
261 fputs_filtered (", ", stream);
265 current_char = extract_unsigned_integer (string + i * width, width,
271 && extract_unsigned_integer (string + rep1 * width, width,
272 byte_order) == current_char)
278 if (reps > options->repeat_count_threshold)
282 fputs_filtered ("', ", stream);
285 pascal_printchar (current_char, type, stream);
286 fprintf_filtered (stream, " <repeats %u times>", reps);
288 things_printed += options->repeat_count_threshold;
293 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
295 fputs_filtered ("'", stream);
298 pascal_one_char (current_char, stream, &in_quotes);
303 /* Terminate the quotes if necessary. */
305 fputs_filtered ("'", stream);
307 if (force_ellipses || i < length)
308 fputs_filtered ("...", stream);
312 /* Table mapping opcodes into strings for printing operators
313 and precedences of the operators. */
315 const struct op_print pascal_op_print_tab[] =
317 {",", BINOP_COMMA, PREC_COMMA, 0},
318 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
319 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
320 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
321 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
322 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
323 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
324 {"<=", BINOP_LEQ, PREC_ORDER, 0},
325 {">=", BINOP_GEQ, PREC_ORDER, 0},
326 {">", BINOP_GTR, PREC_ORDER, 0},
327 {"<", BINOP_LESS, PREC_ORDER, 0},
328 {"shr", BINOP_RSH, PREC_SHIFT, 0},
329 {"shl", BINOP_LSH, PREC_SHIFT, 0},
330 {"+", BINOP_ADD, PREC_ADD, 0},
331 {"-", BINOP_SUB, PREC_ADD, 0},
332 {"*", BINOP_MUL, PREC_MUL, 0},
333 {"/", BINOP_DIV, PREC_MUL, 0},
334 {"div", BINOP_INTDIV, PREC_MUL, 0},
335 {"mod", BINOP_REM, PREC_MUL, 0},
336 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
337 {"-", UNOP_NEG, PREC_PREFIX, 0},
338 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
339 {"^", UNOP_IND, PREC_SUFFIX, 1},
340 {"@", UNOP_ADDR, PREC_PREFIX, 0},
341 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
342 {NULL, OP_NULL, PREC_PREFIX, 0}
345 enum pascal_primitive_types {
346 pascal_primitive_type_int,
347 pascal_primitive_type_long,
348 pascal_primitive_type_short,
349 pascal_primitive_type_char,
350 pascal_primitive_type_float,
351 pascal_primitive_type_double,
352 pascal_primitive_type_void,
353 pascal_primitive_type_long_long,
354 pascal_primitive_type_signed_char,
355 pascal_primitive_type_unsigned_char,
356 pascal_primitive_type_unsigned_short,
357 pascal_primitive_type_unsigned_int,
358 pascal_primitive_type_unsigned_long,
359 pascal_primitive_type_unsigned_long_long,
360 pascal_primitive_type_long_double,
361 pascal_primitive_type_complex,
362 pascal_primitive_type_double_complex,
363 nr_pascal_primitive_types
367 pascal_language_arch_info (struct gdbarch *gdbarch,
368 struct language_arch_info *lai)
370 const struct builtin_type *builtin = builtin_type (gdbarch);
372 lai->string_char_type = builtin->builtin_char;
373 lai->primitive_type_vector
374 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
376 lai->primitive_type_vector [pascal_primitive_type_int]
377 = builtin->builtin_int;
378 lai->primitive_type_vector [pascal_primitive_type_long]
379 = builtin->builtin_long;
380 lai->primitive_type_vector [pascal_primitive_type_short]
381 = builtin->builtin_short;
382 lai->primitive_type_vector [pascal_primitive_type_char]
383 = builtin->builtin_char;
384 lai->primitive_type_vector [pascal_primitive_type_float]
385 = builtin->builtin_float;
386 lai->primitive_type_vector [pascal_primitive_type_double]
387 = builtin->builtin_double;
388 lai->primitive_type_vector [pascal_primitive_type_void]
389 = builtin->builtin_void;
390 lai->primitive_type_vector [pascal_primitive_type_long_long]
391 = builtin->builtin_long_long;
392 lai->primitive_type_vector [pascal_primitive_type_signed_char]
393 = builtin->builtin_signed_char;
394 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
395 = builtin->builtin_unsigned_char;
396 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
397 = builtin->builtin_unsigned_short;
398 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
399 = builtin->builtin_unsigned_int;
400 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
401 = builtin->builtin_unsigned_long;
402 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
403 = builtin->builtin_unsigned_long_long;
404 lai->primitive_type_vector [pascal_primitive_type_long_double]
405 = builtin->builtin_long_double;
406 lai->primitive_type_vector [pascal_primitive_type_complex]
407 = builtin->builtin_complex;
408 lai->primitive_type_vector [pascal_primitive_type_double_complex]
409 = builtin->builtin_double_complex;
411 lai->bool_type_symbol = "boolean";
412 lai->bool_type_default = builtin->builtin_bool;
415 const struct language_defn pascal_language_defn =
417 "pascal", /* Language name */
424 &exp_descriptor_standard,
428 pascal_printchar, /* Print a character constant */
429 pascal_printstr, /* Function to print string constant */
430 pascal_emit_char, /* Print a single char */
431 pascal_print_type, /* Print a type using appropriate syntax */
432 pascal_print_typedef, /* Print a typedef using appropriate syntax */
433 pascal_val_print, /* Print a value using appropriate syntax */
434 pascal_value_print, /* Print a top-level value */
435 default_read_var_value, /* la_read_var_value */
436 NULL, /* Language specific skip_trampoline */
437 "this", /* name_of_this */
438 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
439 basic_lookup_transparent_type,/* lookup_transparent_type */
440 NULL, /* Language specific symbol demangler */
441 NULL, /* Language specific class_name_from_physname */
442 pascal_op_print_tab, /* expression operators for printing */
443 1, /* c-style arrays */
444 0, /* String lower bound */
445 default_word_break_characters,
446 default_make_symbol_completion_list,
447 pascal_language_arch_info,
448 default_print_array_index,
449 default_pass_by_reference,
451 NULL, /* la_get_symbol_name_cmp */
452 iterate_over_symbols,
460 _initialize_pascal_language (void)
462 add_language (&pascal_language_defn);