1 /* Pascal language support routines for GDB, the GNU debugger.
3 Copyright (C) 2000-2017 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 /* All GPC versions until now (2007-09-27) also define a symbol called
36 '_p_initialize'. Check for the presence of this symbol first. */
37 static const char GPC_P_INITIALIZE[] = "_p_initialize";
39 /* The name of the symbol that GPC uses as the name of the main
40 procedure (since version 20050212). */
41 static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
43 /* Older versions of GPC (versions older than 20050212) were using
44 a different name for the main procedure. */
45 static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
47 /* Function returning the special symbol name used
48 by GPC for the main procedure in the main program
49 if it is found in minimal symbol list.
50 This function tries to find minimal symbols generated by GPC
51 so that it finds the even if the program was compiled
52 without debugging information.
53 According to information supplied by Waldeck Hebisch,
54 this should work for all versions posterior to June 2000. */
57 pascal_main_name (void)
59 struct bound_minimal_symbol msym;
61 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
63 /* If '_p_initialize' was not found, the main program is likely not
65 if (msym.minsym == NULL)
68 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
69 if (msym.minsym != NULL)
71 return GPC_MAIN_PROGRAM_NAME_1;
74 msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
75 if (msym.minsym != NULL)
77 return GPC_MAIN_PROGRAM_NAME_2;
80 /* No known entry procedure found, the main program is probably
81 not compiled with GPC. */
85 /* Determines if type TYPE is a pascal string type.
86 Returns a positive value if the type is a known pascal string type.
87 This function is used by p-valprint.c code to allow better string display.
88 If it is a pascal string type, then it also sets info needed
89 to get the length and the data of the string
90 length_pos, length_size and string_pos are given in bytes.
91 char_size gives the element size in bytes.
92 FIXME: if the position or the size of these fields
93 are not multiple of TARGET_CHAR_BIT then the results are wrong
94 but this does not happen for Free Pascal nor for GPC. */
96 is_pascal_string_type (struct type *type,int *length_pos,
97 int *length_size, int *string_pos,
98 struct type **char_type,
99 const char **arrayname)
101 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT)
103 /* Old Borland type pascal strings from Free Pascal Compiler. */
104 /* Two fields: length and st. */
105 if (TYPE_NFIELDS (type) == 2
106 && TYPE_FIELD_NAME (type, 0)
107 && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
108 && TYPE_FIELD_NAME (type, 1)
109 && strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
112 *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
114 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
116 *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
118 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
120 *arrayname = TYPE_FIELD_NAME (type, 1);
123 /* GNU pascal strings. */
124 /* Three fields: Capacity, length and schema$ or _p_schema. */
125 if (TYPE_NFIELDS (type) == 3
126 && TYPE_FIELD_NAME (type, 0)
127 && strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
128 && TYPE_FIELD_NAME (type, 1)
129 && strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
132 *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
134 *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
136 *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
137 /* FIXME: how can I detect wide chars in GPC ?? */
140 *char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2));
142 if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
143 *char_type = TYPE_TARGET_TYPE (*char_type);
146 *arrayname = TYPE_FIELD_NAME (type, 2);
153 static void pascal_one_char (int, struct ui_file *, int *);
155 /* Print the character C on STREAM as part of the contents of a literal
157 In_quotes is reset to 0 if a char is written with #4 notation. */
160 pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
162 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
165 fputs_filtered ("'", stream);
169 fputs_filtered ("''", stream);
172 fprintf_filtered (stream, "%c", c);
177 fputs_filtered ("'", stream);
179 fprintf_filtered (stream, "#%d", (unsigned int) c);
183 static void pascal_emit_char (int c, struct type *type,
184 struct ui_file *stream, int quoter);
186 /* Print the character C on STREAM as part of the contents of a literal
187 string whose delimiter is QUOTER. Note that that format for printing
188 characters and strings is language specific. */
191 pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
195 pascal_one_char (c, stream, &in_quotes);
197 fputs_filtered ("'", stream);
201 pascal_printchar (int c, struct type *type, struct ui_file *stream)
205 pascal_one_char (c, stream, &in_quotes);
207 fputs_filtered ("'", stream);
210 /* Print the character string STRING, printing at most LENGTH characters.
211 Printing stops early if the number hits print_max; repeat counts
212 are printed as appropriate. Print ellipses at the end if we
213 had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
216 pascal_printstr (struct ui_file *stream, struct type *type,
217 const gdb_byte *string, unsigned int length,
218 const char *encoding, int force_ellipses,
219 const struct value_print_options *options)
221 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
223 unsigned int things_printed = 0;
228 /* Preserve TYPE's original type, just set its LENGTH. */
229 check_typedef (type);
230 width = TYPE_LENGTH (type);
232 /* If the string was not truncated due to `set print elements', and
233 the last byte of it is a null, we don't print that, in traditional C
235 if ((!force_ellipses) && length > 0
236 && extract_unsigned_integer (string + (length - 1) * width, width,
242 fputs_filtered ("''", stream);
246 for (i = 0; i < length && things_printed < options->print_max; ++i)
248 /* Position of the character we are examining
249 to see whether it is repeated. */
251 /* Number of repetitions we have detected so far. */
253 unsigned long int current_char;
259 fputs_filtered (", ", stream);
263 current_char = extract_unsigned_integer (string + i * width, width,
269 && extract_unsigned_integer (string + rep1 * width, width,
270 byte_order) == current_char)
276 if (reps > options->repeat_count_threshold)
280 fputs_filtered ("', ", stream);
283 pascal_printchar (current_char, type, stream);
284 fprintf_filtered (stream, " <repeats %u times>", reps);
286 things_printed += options->repeat_count_threshold;
291 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
293 fputs_filtered ("'", stream);
296 pascal_one_char (current_char, stream, &in_quotes);
301 /* Terminate the quotes if necessary. */
303 fputs_filtered ("'", stream);
305 if (force_ellipses || i < length)
306 fputs_filtered ("...", stream);
310 /* Table mapping opcodes into strings for printing operators
311 and precedences of the operators. */
313 const struct op_print pascal_op_print_tab[] =
315 {",", BINOP_COMMA, PREC_COMMA, 0},
316 {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
317 {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
318 {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
319 {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
320 {"=", BINOP_EQUAL, PREC_EQUAL, 0},
321 {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
322 {"<=", BINOP_LEQ, PREC_ORDER, 0},
323 {">=", BINOP_GEQ, PREC_ORDER, 0},
324 {">", BINOP_GTR, PREC_ORDER, 0},
325 {"<", BINOP_LESS, PREC_ORDER, 0},
326 {"shr", BINOP_RSH, PREC_SHIFT, 0},
327 {"shl", BINOP_LSH, PREC_SHIFT, 0},
328 {"+", BINOP_ADD, PREC_ADD, 0},
329 {"-", BINOP_SUB, PREC_ADD, 0},
330 {"*", BINOP_MUL, PREC_MUL, 0},
331 {"/", BINOP_DIV, PREC_MUL, 0},
332 {"div", BINOP_INTDIV, PREC_MUL, 0},
333 {"mod", BINOP_REM, PREC_MUL, 0},
334 {"@", BINOP_REPEAT, PREC_REPEAT, 0},
335 {"-", UNOP_NEG, PREC_PREFIX, 0},
336 {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
337 {"^", UNOP_IND, PREC_SUFFIX, 1},
338 {"@", UNOP_ADDR, PREC_PREFIX, 0},
339 {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
340 {NULL, OP_NULL, PREC_PREFIX, 0}
343 enum pascal_primitive_types {
344 pascal_primitive_type_int,
345 pascal_primitive_type_long,
346 pascal_primitive_type_short,
347 pascal_primitive_type_char,
348 pascal_primitive_type_float,
349 pascal_primitive_type_double,
350 pascal_primitive_type_void,
351 pascal_primitive_type_long_long,
352 pascal_primitive_type_signed_char,
353 pascal_primitive_type_unsigned_char,
354 pascal_primitive_type_unsigned_short,
355 pascal_primitive_type_unsigned_int,
356 pascal_primitive_type_unsigned_long,
357 pascal_primitive_type_unsigned_long_long,
358 pascal_primitive_type_long_double,
359 pascal_primitive_type_complex,
360 pascal_primitive_type_double_complex,
361 nr_pascal_primitive_types
365 pascal_language_arch_info (struct gdbarch *gdbarch,
366 struct language_arch_info *lai)
368 const struct builtin_type *builtin = builtin_type (gdbarch);
370 lai->string_char_type = builtin->builtin_char;
371 lai->primitive_type_vector
372 = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
374 lai->primitive_type_vector [pascal_primitive_type_int]
375 = builtin->builtin_int;
376 lai->primitive_type_vector [pascal_primitive_type_long]
377 = builtin->builtin_long;
378 lai->primitive_type_vector [pascal_primitive_type_short]
379 = builtin->builtin_short;
380 lai->primitive_type_vector [pascal_primitive_type_char]
381 = builtin->builtin_char;
382 lai->primitive_type_vector [pascal_primitive_type_float]
383 = builtin->builtin_float;
384 lai->primitive_type_vector [pascal_primitive_type_double]
385 = builtin->builtin_double;
386 lai->primitive_type_vector [pascal_primitive_type_void]
387 = builtin->builtin_void;
388 lai->primitive_type_vector [pascal_primitive_type_long_long]
389 = builtin->builtin_long_long;
390 lai->primitive_type_vector [pascal_primitive_type_signed_char]
391 = builtin->builtin_signed_char;
392 lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
393 = builtin->builtin_unsigned_char;
394 lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
395 = builtin->builtin_unsigned_short;
396 lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
397 = builtin->builtin_unsigned_int;
398 lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
399 = builtin->builtin_unsigned_long;
400 lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
401 = builtin->builtin_unsigned_long_long;
402 lai->primitive_type_vector [pascal_primitive_type_long_double]
403 = builtin->builtin_long_double;
404 lai->primitive_type_vector [pascal_primitive_type_complex]
405 = builtin->builtin_complex;
406 lai->primitive_type_vector [pascal_primitive_type_double_complex]
407 = builtin->builtin_double_complex;
409 lai->bool_type_symbol = "boolean";
410 lai->bool_type_default = builtin->builtin_bool;
413 static const char *p_extensions[] =
415 ".pas", ".p", ".pp", NULL
418 extern const struct language_defn pascal_language_defn =
420 "pascal", /* Language name */
428 &exp_descriptor_standard,
432 pascal_printchar, /* Print a character constant */
433 pascal_printstr, /* Function to print string constant */
434 pascal_emit_char, /* Print a single char */
435 pascal_print_type, /* Print a type using appropriate syntax */
436 pascal_print_typedef, /* Print a typedef using appropriate syntax */
437 pascal_val_print, /* Print a value using appropriate syntax */
438 pascal_value_print, /* Print a top-level value */
439 default_read_var_value, /* la_read_var_value */
440 NULL, /* Language specific skip_trampoline */
441 "this", /* name_of_this */
442 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
443 basic_lookup_transparent_type,/* lookup_transparent_type */
444 NULL, /* Language specific symbol demangler */
446 NULL, /* Language specific class_name_from_physname */
447 pascal_op_print_tab, /* expression operators for printing */
448 1, /* c-style arrays */
449 0, /* String lower bound */
450 default_word_break_characters,
451 default_collect_symbol_completion_matches,
452 pascal_language_arch_info,
453 default_print_array_index,
454 default_pass_by_reference,
456 c_watch_location_expression,
457 NULL, /* la_get_symbol_name_cmp */
458 iterate_over_symbols,
459 default_search_name_hash,