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22e39759 | 1 | /* C language support routines for GDB, the GNU debugger. |
cef0333e | 2 | Copyright 1992, 1993, 1994 Free Software Foundation, Inc. |
22e39759 FF |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
22e39759 FF |
19 | |
20 | #include "defs.h" | |
21 | #include "symtab.h" | |
22 | #include "gdbtypes.h" | |
23 | #include "expression.h" | |
24 | #include "parser-defs.h" | |
25 | #include "language.h" | |
26 | #include "c-lang.h" | |
27 | ||
28 | /* Print the character C on STREAM as part of the contents of a literal | |
29 | string whose delimiter is QUOTER. Note that that format for printing | |
30 | characters and strings is language specific. */ | |
31 | ||
32 | static void | |
33 | emit_char (c, stream, quoter) | |
34 | register int c; | |
199b2450 | 35 | GDB_FILE *stream; |
22e39759 FF |
36 | int quoter; |
37 | { | |
38 | ||
39 | c &= 0xFF; /* Avoid sign bit follies */ | |
40 | ||
41 | if (PRINT_LITERAL_FORM (c)) | |
42 | { | |
43 | if (c == '\\' || c == quoter) | |
44 | { | |
45 | fputs_filtered ("\\", stream); | |
46 | } | |
47 | fprintf_filtered (stream, "%c", c); | |
48 | } | |
49 | else | |
50 | { | |
51 | switch (c) | |
52 | { | |
53 | case '\n': | |
54 | fputs_filtered ("\\n", stream); | |
55 | break; | |
56 | case '\b': | |
57 | fputs_filtered ("\\b", stream); | |
58 | break; | |
59 | case '\t': | |
60 | fputs_filtered ("\\t", stream); | |
61 | break; | |
62 | case '\f': | |
63 | fputs_filtered ("\\f", stream); | |
64 | break; | |
65 | case '\r': | |
66 | fputs_filtered ("\\r", stream); | |
67 | break; | |
68 | case '\033': | |
69 | fputs_filtered ("\\e", stream); | |
70 | break; | |
71 | case '\007': | |
72 | fputs_filtered ("\\a", stream); | |
73 | break; | |
74 | default: | |
75 | fprintf_filtered (stream, "\\%.3o", (unsigned int) c); | |
76 | break; | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
81 | static void | |
82 | c_printchar (c, stream) | |
83 | int c; | |
199b2450 | 84 | GDB_FILE *stream; |
22e39759 FF |
85 | { |
86 | fputs_filtered ("'", stream); | |
87 | emit_char (c, stream, '\''); | |
88 | fputs_filtered ("'", stream); | |
89 | } | |
90 | ||
91 | /* Print the character string STRING, printing at most LENGTH characters. | |
92 | Printing stops early if the number hits print_max; repeat counts | |
93 | are printed as appropriate. Print ellipses at the end if we | |
94 | had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ | |
95 | ||
96 | static void | |
97 | c_printstr (stream, string, length, force_ellipses) | |
199b2450 | 98 | GDB_FILE *stream; |
22e39759 FF |
99 | char *string; |
100 | unsigned int length; | |
101 | int force_ellipses; | |
102 | { | |
103 | register unsigned int i; | |
104 | unsigned int things_printed = 0; | |
105 | int in_quotes = 0; | |
106 | int need_comma = 0; | |
107 | extern int inspect_it; | |
108 | extern int repeat_count_threshold; | |
109 | extern int print_max; | |
110 | ||
c5c00171 JG |
111 | /* If the string was not truncated due to `set print elements', and |
112 | the last byte of it is a null, we don't print that, in traditional C | |
113 | style. */ | |
961ccde6 | 114 | if ((!force_ellipses) && length > 0 && string[length-1] == '\0') |
c5c00171 JG |
115 | length--; |
116 | ||
22e39759 FF |
117 | if (length == 0) |
118 | { | |
55768580 | 119 | fputs_filtered ("\"\"", stream); |
22e39759 FF |
120 | return; |
121 | } | |
122 | ||
123 | for (i = 0; i < length && things_printed < print_max; ++i) | |
124 | { | |
125 | /* Position of the character we are examining | |
126 | to see whether it is repeated. */ | |
127 | unsigned int rep1; | |
128 | /* Number of repetitions we have detected so far. */ | |
129 | unsigned int reps; | |
130 | ||
131 | QUIT; | |
132 | ||
133 | if (need_comma) | |
134 | { | |
135 | fputs_filtered (", ", stream); | |
136 | need_comma = 0; | |
137 | } | |
138 | ||
139 | rep1 = i + 1; | |
140 | reps = 1; | |
141 | while (rep1 < length && string[rep1] == string[i]) | |
142 | { | |
143 | ++rep1; | |
144 | ++reps; | |
145 | } | |
146 | ||
147 | if (reps > repeat_count_threshold) | |
148 | { | |
149 | if (in_quotes) | |
150 | { | |
151 | if (inspect_it) | |
152 | fputs_filtered ("\\\", ", stream); | |
153 | else | |
154 | fputs_filtered ("\", ", stream); | |
155 | in_quotes = 0; | |
156 | } | |
157 | c_printchar (string[i], stream); | |
158 | fprintf_filtered (stream, " <repeats %u times>", reps); | |
159 | i = rep1 - 1; | |
160 | things_printed += repeat_count_threshold; | |
161 | need_comma = 1; | |
162 | } | |
163 | else | |
164 | { | |
165 | if (!in_quotes) | |
166 | { | |
167 | if (inspect_it) | |
168 | fputs_filtered ("\\\"", stream); | |
169 | else | |
170 | fputs_filtered ("\"", stream); | |
171 | in_quotes = 1; | |
172 | } | |
173 | emit_char (string[i], stream, '"'); | |
174 | ++things_printed; | |
175 | } | |
176 | } | |
177 | ||
178 | /* Terminate the quotes if necessary. */ | |
179 | if (in_quotes) | |
180 | { | |
181 | if (inspect_it) | |
182 | fputs_filtered ("\\\"", stream); | |
183 | else | |
184 | fputs_filtered ("\"", stream); | |
185 | } | |
186 | ||
187 | if (force_ellipses || i < length) | |
188 | fputs_filtered ("...", stream); | |
189 | } | |
190 | ||
191 | /* Create a fundamental C type using default reasonable for the current | |
192 | target machine. | |
193 | ||
194 | Some object/debugging file formats (DWARF version 1, COFF, etc) do not | |
195 | define fundamental types such as "int" or "double". Others (stabs or | |
196 | DWARF version 2, etc) do define fundamental types. For the formats which | |
197 | don't provide fundamental types, gdb can create such types using this | |
198 | function. | |
199 | ||
200 | FIXME: Some compilers distinguish explicitly signed integral types | |
201 | (signed short, signed int, signed long) from "regular" integral types | |
202 | (short, int, long) in the debugging information. There is some dis- | |
203 | agreement as to how useful this feature is. In particular, gcc does | |
204 | not support this. Also, only some debugging formats allow the | |
205 | distinction to be passed on to a debugger. For now, we always just | |
206 | use "short", "int", or "long" as the type name, for both the implicit | |
207 | and explicitly signed types. This also makes life easier for the | |
208 | gdb test suite since we don't have to account for the differences | |
209 | in output depending upon what the compiler and debugging format | |
210 | support. We will probably have to re-examine the issue when gdb | |
211 | starts taking it's fundamental type information directly from the | |
212 | debugging information supplied by the compiler. fnf@cygnus.com */ | |
213 | ||
214 | static struct type * | |
215 | c_create_fundamental_type (objfile, typeid) | |
216 | struct objfile *objfile; | |
217 | int typeid; | |
218 | { | |
219 | register struct type *type = NULL; | |
22e39759 FF |
220 | |
221 | switch (typeid) | |
222 | { | |
223 | default: | |
224 | /* FIXME: For now, if we are asked to produce a type not in this | |
225 | language, create the equivalent of a C integer type with the | |
226 | name "<?type?>". When all the dust settles from the type | |
227 | reconstruction work, this should probably become an error. */ | |
228 | type = init_type (TYPE_CODE_INT, | |
229 | TARGET_INT_BIT / TARGET_CHAR_BIT, | |
230 | 0, "<?type?>", objfile); | |
231 | warning ("internal error: no C/C++ fundamental type %d", typeid); | |
232 | break; | |
233 | case FT_VOID: | |
234 | type = init_type (TYPE_CODE_VOID, | |
235 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, | |
236 | 0, "void", objfile); | |
237 | break; | |
238 | case FT_CHAR: | |
239 | type = init_type (TYPE_CODE_INT, | |
240 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, | |
241 | 0, "char", objfile); | |
242 | break; | |
243 | case FT_SIGNED_CHAR: | |
244 | type = init_type (TYPE_CODE_INT, | |
245 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, | |
dda398c3 | 246 | 0, "signed char", objfile); |
22e39759 FF |
247 | break; |
248 | case FT_UNSIGNED_CHAR: | |
249 | type = init_type (TYPE_CODE_INT, | |
250 | TARGET_CHAR_BIT / TARGET_CHAR_BIT, | |
251 | TYPE_FLAG_UNSIGNED, "unsigned char", objfile); | |
252 | break; | |
253 | case FT_SHORT: | |
254 | type = init_type (TYPE_CODE_INT, | |
255 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, | |
256 | 0, "short", objfile); | |
257 | break; | |
258 | case FT_SIGNED_SHORT: | |
259 | type = init_type (TYPE_CODE_INT, | |
260 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, | |
dda398c3 | 261 | 0, "short", objfile); /* FIXME-fnf */ |
22e39759 FF |
262 | break; |
263 | case FT_UNSIGNED_SHORT: | |
264 | type = init_type (TYPE_CODE_INT, | |
265 | TARGET_SHORT_BIT / TARGET_CHAR_BIT, | |
266 | TYPE_FLAG_UNSIGNED, "unsigned short", objfile); | |
267 | break; | |
268 | case FT_INTEGER: | |
269 | type = init_type (TYPE_CODE_INT, | |
270 | TARGET_INT_BIT / TARGET_CHAR_BIT, | |
271 | 0, "int", objfile); | |
272 | break; | |
273 | case FT_SIGNED_INTEGER: | |
274 | type = init_type (TYPE_CODE_INT, | |
275 | TARGET_INT_BIT / TARGET_CHAR_BIT, | |
dda398c3 | 276 | 0, "int", objfile); /* FIXME -fnf */ |
22e39759 FF |
277 | break; |
278 | case FT_UNSIGNED_INTEGER: | |
279 | type = init_type (TYPE_CODE_INT, | |
280 | TARGET_INT_BIT / TARGET_CHAR_BIT, | |
281 | TYPE_FLAG_UNSIGNED, "unsigned int", objfile); | |
282 | break; | |
283 | case FT_LONG: | |
284 | type = init_type (TYPE_CODE_INT, | |
285 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
286 | 0, "long", objfile); | |
287 | break; | |
288 | case FT_SIGNED_LONG: | |
289 | type = init_type (TYPE_CODE_INT, | |
290 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
dda398c3 | 291 | 0, "long", objfile); /* FIXME -fnf */ |
22e39759 FF |
292 | break; |
293 | case FT_UNSIGNED_LONG: | |
294 | type = init_type (TYPE_CODE_INT, | |
295 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
296 | TYPE_FLAG_UNSIGNED, "unsigned long", objfile); | |
297 | break; | |
298 | case FT_LONG_LONG: | |
299 | type = init_type (TYPE_CODE_INT, | |
300 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, | |
301 | 0, "long long", objfile); | |
302 | break; | |
303 | case FT_SIGNED_LONG_LONG: | |
304 | type = init_type (TYPE_CODE_INT, | |
305 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, | |
dda398c3 | 306 | 0, "signed long long", objfile); |
22e39759 FF |
307 | break; |
308 | case FT_UNSIGNED_LONG_LONG: | |
309 | type = init_type (TYPE_CODE_INT, | |
310 | TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, | |
311 | TYPE_FLAG_UNSIGNED, "unsigned long long", objfile); | |
312 | break; | |
313 | case FT_FLOAT: | |
314 | type = init_type (TYPE_CODE_FLT, | |
315 | TARGET_FLOAT_BIT / TARGET_CHAR_BIT, | |
316 | 0, "float", objfile); | |
317 | break; | |
318 | case FT_DBL_PREC_FLOAT: | |
319 | type = init_type (TYPE_CODE_FLT, | |
320 | TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, | |
321 | 0, "double", objfile); | |
322 | break; | |
323 | case FT_EXT_PREC_FLOAT: | |
324 | type = init_type (TYPE_CODE_FLT, | |
325 | TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, | |
326 | 0, "long double", objfile); | |
327 | break; | |
328 | } | |
329 | return (type); | |
330 | } | |
331 | ||
332 | \f | |
333 | /* Table mapping opcodes into strings for printing operators | |
334 | and precedences of the operators. */ | |
335 | ||
a8a69e63 | 336 | static const struct op_print c_op_print_tab[] = |
22e39759 FF |
337 | { |
338 | {",", BINOP_COMMA, PREC_COMMA, 0}, | |
339 | {"=", BINOP_ASSIGN, PREC_ASSIGN, 1}, | |
340 | {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, | |
341 | {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, | |
342 | {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, | |
343 | {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, | |
344 | {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, | |
345 | {"==", BINOP_EQUAL, PREC_EQUAL, 0}, | |
346 | {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, | |
347 | {"<=", BINOP_LEQ, PREC_ORDER, 0}, | |
348 | {">=", BINOP_GEQ, PREC_ORDER, 0}, | |
349 | {">", BINOP_GTR, PREC_ORDER, 0}, | |
350 | {"<", BINOP_LESS, PREC_ORDER, 0}, | |
351 | {">>", BINOP_RSH, PREC_SHIFT, 0}, | |
352 | {"<<", BINOP_LSH, PREC_SHIFT, 0}, | |
353 | {"+", BINOP_ADD, PREC_ADD, 0}, | |
354 | {"-", BINOP_SUB, PREC_ADD, 0}, | |
355 | {"*", BINOP_MUL, PREC_MUL, 0}, | |
356 | {"/", BINOP_DIV, PREC_MUL, 0}, | |
357 | {"%", BINOP_REM, PREC_MUL, 0}, | |
358 | {"@", BINOP_REPEAT, PREC_REPEAT, 0}, | |
359 | {"-", UNOP_NEG, PREC_PREFIX, 0}, | |
360 | {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, | |
361 | {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0}, | |
362 | {"*", UNOP_IND, PREC_PREFIX, 0}, | |
363 | {"&", UNOP_ADDR, PREC_PREFIX, 0}, | |
364 | {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0}, | |
365 | {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0}, | |
366 | {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0}, | |
367 | /* C++ */ | |
368 | {"::", BINOP_SCOPE, PREC_PREFIX, 0}, | |
369 | {NULL, 0, 0, 0} | |
370 | }; | |
371 | \f | |
22e39759 FF |
372 | struct type ** const (c_builtin_types[]) = |
373 | { | |
374 | &builtin_type_int, | |
375 | &builtin_type_long, | |
376 | &builtin_type_short, | |
377 | &builtin_type_char, | |
378 | &builtin_type_float, | |
379 | &builtin_type_double, | |
380 | &builtin_type_void, | |
381 | &builtin_type_long_long, | |
382 | &builtin_type_signed_char, | |
383 | &builtin_type_unsigned_char, | |
384 | &builtin_type_unsigned_short, | |
385 | &builtin_type_unsigned_int, | |
386 | &builtin_type_unsigned_long, | |
387 | &builtin_type_unsigned_long_long, | |
388 | &builtin_type_long_double, | |
389 | &builtin_type_complex, | |
390 | &builtin_type_double_complex, | |
391 | 0 | |
392 | }; | |
393 | ||
394 | const struct language_defn c_language_defn = { | |
395 | "c", /* Language name */ | |
396 | language_c, | |
397 | c_builtin_types, | |
398 | range_check_off, | |
399 | type_check_off, | |
400 | c_parse, | |
401 | c_error, | |
7398958c | 402 | evaluate_subexp_standard, |
22e39759 FF |
403 | c_printchar, /* Print a character constant */ |
404 | c_printstr, /* Function to print string constant */ | |
405 | c_create_fundamental_type, /* Create fundamental type in this language */ | |
a8a69e63 FF |
406 | c_print_type, /* Print a type using appropriate syntax */ |
407 | c_val_print, /* Print a value using appropriate syntax */ | |
e10cfcaa | 408 | c_value_print, /* Print a top-level value */ |
22e39759 | 409 | {"", "", "", ""}, /* Binary format info */ |
5573d7d4 JK |
410 | {"0%lo", "0", "o", ""}, /* Octal format info */ |
411 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
412 | {"0x%lx", "0x", "x", ""}, /* Hex format info */ | |
22e39759 | 413 | c_op_print_tab, /* expression operators for printing */ |
acc4efde | 414 | 1, /* c-style arrays */ |
ead95f8a PB |
415 | 0, /* String lower bound */ |
416 | &builtin_type_char, /* Type of string elements */ | |
22e39759 FF |
417 | LANG_MAGIC |
418 | }; | |
419 | ||
420 | const struct language_defn cplus_language_defn = { | |
421 | "c++", /* Language name */ | |
422 | language_cplus, | |
423 | c_builtin_types, | |
424 | range_check_off, | |
425 | type_check_off, | |
426 | c_parse, | |
427 | c_error, | |
7398958c | 428 | evaluate_subexp_standard, |
22e39759 FF |
429 | c_printchar, /* Print a character constant */ |
430 | c_printstr, /* Function to print string constant */ | |
431 | c_create_fundamental_type, /* Create fundamental type in this language */ | |
a8a69e63 FF |
432 | c_print_type, /* Print a type using appropriate syntax */ |
433 | c_val_print, /* Print a value using appropriate syntax */ | |
e10cfcaa | 434 | c_value_print, /* Print a top-level value */ |
22e39759 | 435 | {"", "", "", ""}, /* Binary format info */ |
5573d7d4 JK |
436 | {"0%lo", "0", "o", ""}, /* Octal format info */ |
437 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
438 | {"0x%lx", "0x", "x", ""}, /* Hex format info */ | |
22e39759 | 439 | c_op_print_tab, /* expression operators for printing */ |
acc4efde | 440 | 1, /* c-style arrays */ |
ead95f8a PB |
441 | 0, /* String lower bound */ |
442 | &builtin_type_char, /* Type of string elements */ | |
22e39759 FF |
443 | LANG_MAGIC |
444 | }; | |
445 | ||
2c068010 PS |
446 | const struct language_defn asm_language_defn = { |
447 | "asm", /* Language name */ | |
448 | language_asm, | |
449 | c_builtin_types, | |
450 | range_check_off, | |
451 | type_check_off, | |
452 | c_parse, | |
453 | c_error, | |
7398958c | 454 | evaluate_subexp_standard, |
2c068010 PS |
455 | c_printchar, /* Print a character constant */ |
456 | c_printstr, /* Function to print string constant */ | |
457 | c_create_fundamental_type, /* Create fundamental type in this language */ | |
458 | c_print_type, /* Print a type using appropriate syntax */ | |
459 | c_val_print, /* Print a value using appropriate syntax */ | |
460 | c_value_print, /* Print a top-level value */ | |
2c068010 PS |
461 | {"", "", "", ""}, /* Binary format info */ |
462 | {"0%lo", "0", "o", ""}, /* Octal format info */ | |
463 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
464 | {"0x%lx", "0x", "x", ""}, /* Hex format info */ | |
465 | c_op_print_tab, /* expression operators for printing */ | |
acc4efde | 466 | 1, /* c-style arrays */ |
ead95f8a PB |
467 | 0, /* String lower bound */ |
468 | &builtin_type_char, /* Type of string elements */ | |
2c068010 PS |
469 | LANG_MAGIC |
470 | }; | |
471 | ||
22e39759 | 472 | void |
d62e7a20 | 473 | _initialize_c_language () |
22e39759 | 474 | { |
22e39759 FF |
475 | add_language (&c_language_defn); |
476 | add_language (&cplus_language_defn); | |
2c068010 | 477 | add_language (&asm_language_defn); |
22e39759 | 478 | } |