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/tmp/gdb-13.1/gdb/p-lang.c
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1/* Pascal language support routines for GDB, the GNU debugger.
2
3 Copyright (C) 2000-2023 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
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.
11
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.
16
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/>. */
19
20/* This file is derived from c-lang.c */
21
22#include "defs.h"
23#include "symtab.h"
24#include "gdbtypes.h"
25#include "expression.h"
26#include "parser-defs.h"
27#include "language.h"
28#include "varobj.h"
29#include "p-lang.h"
30#include "valprint.h"
31#include "value.h"
32#include <ctype.h>
33#include "c-lang.h"
34#include "gdbarch.h"
35#include "cli/cli-style.h"
36
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. */
39static const char GPC_P_INITIALIZE[] = "_p_initialize";
40
41/* The name of the symbol that GPC uses as the name of the main
42 procedure (since version 20050212). */
43static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
44
45/* Older versions of GPC (versions older than 20050212) were using
46 a different name for the main procedure. */
47static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
48
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. */
57
58const char *
60{
61 struct bound_minimal_symbol msym;
62
63 msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
64
65 /* If '_p_initialize' was not found, the main program is likely not
66 written in Pascal. */
67 if (msym.minsym == NULL)
68 return NULL;
69
71 if (msym.minsym != NULL)
72 {
74 }
75
77 if (msym.minsym != NULL)
78 {
80 }
81
82 /* No known entry procedure found, the main program is probably
83 not compiled with GPC. */
84 return NULL;
85}
86
87/* See p-lang.h. */
88
89int
90pascal_is_string_type (struct type *type,int *length_pos, int *length_size,
91 int *string_pos, struct type **char_type,
92 const char **arrayname)
93{
94 if (type != NULL && type->code () == TYPE_CODE_STRUCT)
95 {
96 /* Old Borland type pascal strings from Free Pascal Compiler. */
97 /* Two fields: length and st. */
98 if (type->num_fields () == 2
99 && type->field (0).name ()
100 && strcmp (type->field (0).name (), "length") == 0
101 && type->field (1).name ()
102 && strcmp (type->field (1).name (), "st") == 0)
103 {
104 if (length_pos)
105 *length_pos = type->field (0).loc_bitpos () / TARGET_CHAR_BIT;
106 if (length_size)
107 *length_size = type->field (0).type ()->length ();
108 if (string_pos)
109 *string_pos = type->field (1).loc_bitpos () / TARGET_CHAR_BIT;
110 if (char_type)
111 *char_type = type->field (1).type ()->target_type ();
112 if (arrayname)
113 *arrayname = type->field (1).name ();
114 return 2;
115 };
116 /* GNU pascal strings. */
117 /* Three fields: Capacity, length and schema$ or _p_schema. */
118 if (type->num_fields () == 3
119 && type->field (0).name ()
120 && strcmp (type->field (0).name (), "Capacity") == 0
121 && type->field (1).name ()
122 && strcmp (type->field (1).name (), "length") == 0)
123 {
124 if (length_pos)
125 *length_pos = type->field (1).loc_bitpos () / TARGET_CHAR_BIT;
126 if (length_size)
127 *length_size = type->field (1).type ()->length ();
128 if (string_pos)
129 *string_pos = type->field (2).loc_bitpos () / TARGET_CHAR_BIT;
130 /* FIXME: how can I detect wide chars in GPC ?? */
131 if (char_type)
132 {
133 *char_type = type->field (2).type ()->target_type ();
134
135 if ((*char_type)->code () == TYPE_CODE_ARRAY)
136 *char_type = (*char_type)->target_type ();
137 }
138 if (arrayname)
139 *arrayname = type->field (2).name ();
140 return 3;
141 };
142 }
143 return 0;
144}
145
146/* See p-lang.h. */
147
148void
150 int *in_quotes) const
151{
152 if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
153 {
154 if (!(*in_quotes))
155 gdb_puts ("'", stream);
156 *in_quotes = 1;
157 if (c == '\'')
158 {
159 gdb_puts ("''", stream);
160 }
161 else
162 gdb_printf (stream, "%c", c);
163 }
164 else
165 {
166 if (*in_quotes)
167 gdb_puts ("'", stream);
168 *in_quotes = 0;
169 gdb_printf (stream, "#%d", (unsigned int) c);
170 }
171}
172
173/* See language.h. */
174
175void
177 struct ui_file *stream) const
178{
179 int in_quotes = 0;
180
181 print_one_char (c, stream, &in_quotes);
182 if (in_quotes)
183 gdb_puts ("'", stream);
184}
185
186
187
188/* See language.h. */
189
191 (struct gdbarch *gdbarch, struct language_arch_info *lai) const
192{
193 const struct builtin_type *builtin = builtin_type (gdbarch);
194
195 /* Helper function to allow shorter lines below. */
196 auto add = [&] (struct type * t)
197 {
198 lai->add_primitive_type (t);
199 };
200
201 add (builtin->builtin_int);
202 add (builtin->builtin_long);
203 add (builtin->builtin_short);
204 add (builtin->builtin_char);
205 add (builtin->builtin_float);
206 add (builtin->builtin_double);
207 add (builtin->builtin_void);
208 add (builtin->builtin_long_long);
209 add (builtin->builtin_signed_char);
210 add (builtin->builtin_unsigned_char);
211 add (builtin->builtin_unsigned_short);
212 add (builtin->builtin_unsigned_int);
213 add (builtin->builtin_unsigned_long);
214 add (builtin->builtin_unsigned_long_long);
215 add (builtin->builtin_long_double);
216 add (builtin->builtin_complex);
217 add (builtin->builtin_double_complex);
218
219 lai->set_string_char_type (builtin->builtin_char);
220 lai->set_bool_type (builtin->builtin_bool, "boolean");
221}
222
223/* See language.h. */
224
225void
226pascal_language::printstr (struct ui_file *stream, struct type *elttype,
227 const gdb_byte *string, unsigned int length,
228 const char *encoding, int force_ellipses,
229 const struct value_print_options *options) const
230{
231 enum bfd_endian byte_order = type_byte_order (elttype);
232 unsigned int i;
233 unsigned int things_printed = 0;
234 int in_quotes = 0;
235 int need_comma = 0;
236 int width;
237
238 /* Preserve ELTTYPE's original type, just set its LENGTH. */
239 check_typedef (elttype);
240 width = elttype->length ();
241
242 /* If the string was not truncated due to `set print elements', and
243 the last byte of it is a null, we don't print that, in traditional C
244 style. */
245 if ((!force_ellipses) && length > 0
246 && extract_unsigned_integer (string + (length - 1) * width, width,
247 byte_order) == 0)
248 length--;
249
250 if (length == 0)
251 {
252 gdb_puts ("''", stream);
253 return;
254 }
255
256 for (i = 0; i < length && things_printed < options->print_max; ++i)
257 {
258 /* Position of the character we are examining
259 to see whether it is repeated. */
260 unsigned int rep1;
261 /* Number of repetitions we have detected so far. */
262 unsigned int reps;
263 unsigned long int current_char;
264
265 QUIT;
266
267 if (need_comma)
268 {
269 gdb_puts (", ", stream);
270 need_comma = 0;
271 }
272
273 current_char = extract_unsigned_integer (string + i * width, width,
274 byte_order);
275
276 rep1 = i + 1;
277 reps = 1;
278 while (rep1 < length
279 && extract_unsigned_integer (string + rep1 * width, width,
280 byte_order) == current_char)
281 {
282 ++rep1;
283 ++reps;
284 }
285
286 if (reps > options->repeat_count_threshold)
287 {
288 if (in_quotes)
289 {
290 gdb_puts ("', ", stream);
291 in_quotes = 0;
292 }
293 printchar (current_char, elttype, stream);
294 gdb_printf (stream, " %p[<repeats %u times>%p]",
296 reps, nullptr);
297 i = rep1 - 1;
298 things_printed += options->repeat_count_threshold;
299 need_comma = 1;
300 }
301 else
302 {
303 if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
304 {
305 gdb_puts ("'", stream);
306 in_quotes = 1;
307 }
308 print_one_char (current_char, stream, &in_quotes);
309 ++things_printed;
310 }
311 }
312
313 /* Terminate the quotes if necessary. */
314 if (in_quotes)
315 gdb_puts ("'", stream);
316
317 if (force_ellipses || i < length)
318 gdb_puts ("...", stream);
319}
320
321/* Single instance of the Pascal language class. */
322
ui_file_style style() const
Definition: cli-style.c:169
void language_arch_info(struct gdbarch *gdbarch, struct language_arch_info *lai) const override
Definition: p-lang.c:191
void print_one_char(int c, struct ui_file *stream, int *in_quotes) const
Definition: p-lang.c:149
void printchar(int ch, struct type *chtype, struct ui_file *stream) const override
Definition: p-lang.c:176
void printstr(struct ui_file *stream, struct type *elttype, const gdb_byte *string, unsigned int length, const char *encoding, int force_ellipses, const struct value_print_options *options) const override
Definition: p-lang.c:226
cli_style_option metadata_style
static ULONGEST extract_unsigned_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition: defs.h:526
#define QUIT
Definition: defs.h:186
enum bfd_endian type_byte_order(const struct type *type)
Definition: gdbtypes.c:4018
struct type * check_typedef(struct type *type)
Definition: gdbtypes.c:3010
#define PRINT_LITERAL_FORM(c)
Definition: language.h:773
struct bound_minimal_symbol lookup_minimal_symbol(const char *name, const char *sfile, struct objfile *objf)
Definition: minsyms.c:363
static const char GPC_P_INITIALIZE[]
Definition: p-lang.c:39
static const char GPC_MAIN_PROGRAM_NAME_1[]
Definition: p-lang.c:43
const char * pascal_main_name(void)
Definition: p-lang.c:59
static const char GPC_MAIN_PROGRAM_NAME_2[]
Definition: p-lang.c:47
int pascal_is_string_type(struct type *type, int *length_pos, int *length_size, int *string_pos, struct type **char_type, const char **arrayname)
Definition: p-lang.c:90
static pascal_language pascal_language_defn
Definition: p-lang.c:323
struct minimal_symbol * minsym
Definition: minsyms.h:49
struct type * builtin_signed_char
Definition: gdbtypes.h:2250
struct type * builtin_long_long
Definition: gdbtypes.h:2264
struct type * builtin_double
Definition: gdbtypes.h:2258
struct type * builtin_long
Definition: gdbtypes.h:2249
struct type * builtin_bool
Definition: gdbtypes.h:2263
struct type * builtin_unsigned_char
Definition: gdbtypes.h:2251
struct type * builtin_complex
Definition: gdbtypes.h:2260
struct type * builtin_long_double
Definition: gdbtypes.h:2259
struct type * builtin_unsigned_long_long
Definition: gdbtypes.h:2265
struct type * builtin_short
Definition: gdbtypes.h:2247
struct type * builtin_double_complex
Definition: gdbtypes.h:2261
struct type * builtin_char
Definition: gdbtypes.h:2246
struct type * builtin_int
Definition: gdbtypes.h:2248
struct type * builtin_unsigned_short
Definition: gdbtypes.h:2252
struct type * builtin_unsigned_int
Definition: gdbtypes.h:2253
struct type * builtin_unsigned_long
Definition: gdbtypes.h:2254
struct type * builtin_void
Definition: gdbtypes.h:2245
struct type * builtin_float
Definition: gdbtypes.h:2257
LONGEST loc_bitpos() const
Definition: gdbtypes.h:586
const char * name() const
Definition: gdbtypes.h:569
struct type * type() const
Definition: gdbtypes.h:559
void set_string_char_type(struct type *type)
Definition: language.h:114
void add_primitive_type(struct type *type)
Definition: language.h:130
void set_bool_type(struct type *type, const char *name=nullptr)
Definition: language.h:102
Definition: gdbtypes.h:922
struct type * target_type() const
Definition: gdbtypes.h:1000
type_code code() const
Definition: gdbtypes.h:927
ULONGEST length() const
Definition: gdbtypes.h:954
struct field & field(int idx) const
Definition: gdbtypes.h:983
int num_fields() const
Definition: gdbtypes.h:965
const ui_file_style * ptr() const
Definition: ui-style.h:233
unsigned int print_max
Definition: valprint.h:58
unsigned int repeat_count_threshold
Definition: valprint.h:62
void gdb_printf(struct ui_file *stream, const char *format,...)
Definition: utils.c:1865
void gdb_puts(const char *linebuffer, struct ui_file *stream)
Definition: utils.c:1788