1 /* Print values for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
5 2009 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
33 #include "floatformat.h"
35 #include "exceptions.h"
37 #include "python/python.h"
41 /* Prototypes for local functions */
43 static int partial_memory_read (CORE_ADDR memaddr, gdb_byte *myaddr,
44 int len, int *errnoptr);
46 static void show_print (char *, int);
48 static void set_print (char *, int);
50 static void set_radix (char *, int);
52 static void show_radix (char *, int);
54 static void set_input_radix (char *, int, struct cmd_list_element *);
56 static void set_input_radix_1 (int, unsigned);
58 static void set_output_radix (char *, int, struct cmd_list_element *);
60 static void set_output_radix_1 (int, unsigned);
62 void _initialize_valprint (void);
64 #define PRINT_MAX_DEFAULT 200 /* Start print_max off at this value. */
66 struct value_print_options user_print_options =
68 Val_pretty_default, /* pretty */
69 0, /* prettyprint_arrays */
70 0, /* prettyprint_structs */
75 PRINT_MAX_DEFAULT, /* print_max */
76 10, /* repeat_count_threshold */
77 0, /* output_format */
79 0, /* stop_print_at_null */
81 0, /* print_array_indexes */
83 1, /* static_field_print */
84 1, /* pascal_static_field_print */
89 /* Initialize *OPTS to be a copy of the user print options. */
91 get_user_print_options (struct value_print_options *opts)
93 *opts = user_print_options;
96 /* Initialize *OPTS to be a copy of the user print options, but with
97 pretty-printing disabled. */
99 get_raw_print_options (struct value_print_options *opts)
101 *opts = user_print_options;
102 opts->pretty = Val_no_prettyprint;
105 /* Initialize *OPTS to be a copy of the user print options, but using
106 FORMAT as the formatting option. */
108 get_formatted_print_options (struct value_print_options *opts,
111 *opts = user_print_options;
112 opts->format = format;
116 show_print_max (struct ui_file *file, int from_tty,
117 struct cmd_list_element *c, const char *value)
119 fprintf_filtered (file, _("\
120 Limit on string chars or array elements to print is %s.\n"),
125 /* Default input and output radixes, and output format letter. */
127 unsigned input_radix = 10;
129 show_input_radix (struct ui_file *file, int from_tty,
130 struct cmd_list_element *c, const char *value)
132 fprintf_filtered (file, _("\
133 Default input radix for entering numbers is %s.\n"),
137 unsigned output_radix = 10;
139 show_output_radix (struct ui_file *file, int from_tty,
140 struct cmd_list_element *c, const char *value)
142 fprintf_filtered (file, _("\
143 Default output radix for printing of values is %s.\n"),
147 /* By default we print arrays without printing the index of each element in
148 the array. This behavior can be changed by setting PRINT_ARRAY_INDEXES. */
151 show_print_array_indexes (struct ui_file *file, int from_tty,
152 struct cmd_list_element *c, const char *value)
154 fprintf_filtered (file, _("Printing of array indexes is %s.\n"), value);
157 /* Print repeat counts if there are more than this many repetitions of an
158 element in an array. Referenced by the low level language dependent
162 show_repeat_count_threshold (struct ui_file *file, int from_tty,
163 struct cmd_list_element *c, const char *value)
165 fprintf_filtered (file, _("Threshold for repeated print elements is %s.\n"),
169 /* If nonzero, stops printing of char arrays at first null. */
172 show_stop_print_at_null (struct ui_file *file, int from_tty,
173 struct cmd_list_element *c, const char *value)
175 fprintf_filtered (file, _("\
176 Printing of char arrays to stop at first null char is %s.\n"),
180 /* Controls pretty printing of structures. */
183 show_prettyprint_structs (struct ui_file *file, int from_tty,
184 struct cmd_list_element *c, const char *value)
186 fprintf_filtered (file, _("Prettyprinting of structures is %s.\n"), value);
189 /* Controls pretty printing of arrays. */
192 show_prettyprint_arrays (struct ui_file *file, int from_tty,
193 struct cmd_list_element *c, const char *value)
195 fprintf_filtered (file, _("Prettyprinting of arrays is %s.\n"), value);
198 /* If nonzero, causes unions inside structures or other unions to be
202 show_unionprint (struct ui_file *file, int from_tty,
203 struct cmd_list_element *c, const char *value)
205 fprintf_filtered (file, _("\
206 Printing of unions interior to structures is %s.\n"),
210 /* If nonzero, causes machine addresses to be printed in certain contexts. */
213 show_addressprint (struct ui_file *file, int from_tty,
214 struct cmd_list_element *c, const char *value)
216 fprintf_filtered (file, _("Printing of addresses is %s.\n"), value);
220 /* A helper function for val_print. When printing in "summary" mode,
221 we want to print scalar arguments, but not aggregate arguments.
222 This function distinguishes between the two. */
225 scalar_type_p (struct type *type)
227 CHECK_TYPEDEF (type);
228 while (TYPE_CODE (type) == TYPE_CODE_REF)
230 type = TYPE_TARGET_TYPE (type);
231 CHECK_TYPEDEF (type);
233 switch (TYPE_CODE (type))
235 case TYPE_CODE_ARRAY:
236 case TYPE_CODE_STRUCT:
237 case TYPE_CODE_UNION:
239 case TYPE_CODE_STRING:
240 case TYPE_CODE_BITSTRING:
247 /* Print using the given LANGUAGE the data of type TYPE located at VALADDR
248 (within GDB), which came from the inferior at address ADDRESS, onto
249 stdio stream STREAM according to OPTIONS.
251 If the data are a string pointer, returns the number of string characters
254 FIXME: The data at VALADDR is in target byte order. If gdb is ever
255 enhanced to be able to debug more than the single target it was compiled
256 for (specific CPU type and thus specific target byte ordering), then
257 either the print routines are going to have to take this into account,
258 or the data is going to have to be passed into here already converted
259 to the host byte ordering, whichever is more convenient. */
263 val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
264 CORE_ADDR address, struct ui_file *stream, int recurse,
265 const struct value_print_options *options,
266 const struct language_defn *language)
268 volatile struct gdb_exception except;
270 struct value_print_options local_opts = *options;
271 struct type *real_type = check_typedef (type);
273 if (local_opts.pretty == Val_pretty_default)
274 local_opts.pretty = (local_opts.prettyprint_structs
275 ? Val_prettyprint : Val_no_prettyprint);
279 /* Ensure that the type is complete and not just a stub. If the type is
280 only a stub and we can't find and substitute its complete type, then
281 print appropriate string and return. */
283 if (TYPE_STUB (real_type))
285 fprintf_filtered (stream, "<incomplete type>");
292 ret = apply_val_pretty_printer (type, valaddr, embedded_offset,
293 address, stream, recurse, options,
299 /* Handle summary mode. If the value is a scalar, print it;
300 otherwise, print an ellipsis. */
301 if (options->summary && !scalar_type_p (type))
303 fprintf_filtered (stream, "...");
307 TRY_CATCH (except, RETURN_MASK_ERROR)
309 ret = language->la_val_print (type, valaddr, embedded_offset, address,
310 stream, recurse, &local_opts);
312 if (except.reason < 0)
313 fprintf_filtered (stream, _("<error reading variable>"));
318 /* Check whether the value VAL is printable. Return 1 if it is;
319 return 0 and print an appropriate error message to STREAM if it
323 value_check_printable (struct value *val, struct ui_file *stream)
327 fprintf_filtered (stream, _("<address of value unknown>"));
331 if (value_optimized_out (val))
333 fprintf_filtered (stream, _("<value optimized out>"));
337 if (TYPE_CODE (value_type (val)) == TYPE_CODE_INTERNAL_FUNCTION)
339 fprintf_filtered (stream, _("<internal function %s>"),
340 value_internal_function_name (val));
347 /* Print using the given LANGUAGE the value VAL onto stream STREAM according
350 If the data are a string pointer, returns the number of string characters
353 This is a preferable interface to val_print, above, because it uses
354 GDB's value mechanism. */
357 common_val_print (struct value *val, struct ui_file *stream, int recurse,
358 const struct value_print_options *options,
359 const struct language_defn *language)
361 if (!value_check_printable (val, stream))
364 return val_print (value_type (val), value_contents_all (val),
365 value_embedded_offset (val), value_address (val),
366 stream, recurse, options, language);
369 /* Print the value VAL in C-ish syntax on stream STREAM according to
371 If the object printed is a string pointer, returns
372 the number of string bytes printed. */
375 value_print (struct value *val, struct ui_file *stream,
376 const struct value_print_options *options)
378 if (!value_check_printable (val, stream))
383 int r = apply_val_pretty_printer (value_type (val),
384 value_contents_all (val),
385 value_embedded_offset (val),
393 return LA_VALUE_PRINT (val, stream, options);
396 /* Called by various <lang>_val_print routines to print
397 TYPE_CODE_INT's. TYPE is the type. VALADDR is the address of the
398 value. STREAM is where to print the value. */
401 val_print_type_code_int (struct type *type, const gdb_byte *valaddr,
402 struct ui_file *stream)
404 enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
406 if (TYPE_LENGTH (type) > sizeof (LONGEST))
410 if (TYPE_UNSIGNED (type)
411 && extract_long_unsigned_integer (valaddr, TYPE_LENGTH (type),
414 print_longest (stream, 'u', 0, val);
418 /* Signed, or we couldn't turn an unsigned value into a
419 LONGEST. For signed values, one could assume two's
420 complement (a reasonable assumption, I think) and do
422 print_hex_chars (stream, (unsigned char *) valaddr,
423 TYPE_LENGTH (type), byte_order);
428 print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0,
429 unpack_long (type, valaddr));
434 val_print_type_code_flags (struct type *type, const gdb_byte *valaddr,
435 struct ui_file *stream)
437 ULONGEST val = unpack_long (type, valaddr);
438 int bitpos, nfields = TYPE_NFIELDS (type);
440 fputs_filtered ("[ ", stream);
441 for (bitpos = 0; bitpos < nfields; bitpos++)
443 if (TYPE_FIELD_BITPOS (type, bitpos) != -1
444 && (val & ((ULONGEST)1 << bitpos)))
446 if (TYPE_FIELD_NAME (type, bitpos))
447 fprintf_filtered (stream, "%s ", TYPE_FIELD_NAME (type, bitpos));
449 fprintf_filtered (stream, "#%d ", bitpos);
452 fputs_filtered ("]", stream);
455 /* Print a number according to FORMAT which is one of d,u,x,o,b,h,w,g.
456 The raison d'etre of this function is to consolidate printing of
457 LONG_LONG's into this one function. The format chars b,h,w,g are
458 from print_scalar_formatted(). Numbers are printed using C
461 USE_C_FORMAT means to use C format in all cases. Without it,
462 'o' and 'x' format do not include the standard C radix prefix
465 Hilfinger/2004-09-09: USE_C_FORMAT was originally called USE_LOCAL
466 and was intended to request formating according to the current
467 language and would be used for most integers that GDB prints. The
468 exceptional cases were things like protocols where the format of
469 the integer is a protocol thing, not a user-visible thing). The
470 parameter remains to preserve the information of what things might
471 be printed with language-specific format, should we ever resurrect
475 print_longest (struct ui_file *stream, int format, int use_c_format,
483 val = int_string (val_long, 10, 1, 0, 1); break;
485 val = int_string (val_long, 10, 0, 0, 1); break;
487 val = int_string (val_long, 16, 0, 0, use_c_format); break;
489 val = int_string (val_long, 16, 0, 2, 1); break;
491 val = int_string (val_long, 16, 0, 4, 1); break;
493 val = int_string (val_long, 16, 0, 8, 1); break;
495 val = int_string (val_long, 16, 0, 16, 1); break;
498 val = int_string (val_long, 8, 0, 0, use_c_format); break;
500 internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
502 fputs_filtered (val, stream);
505 /* This used to be a macro, but I don't think it is called often enough
506 to merit such treatment. */
507 /* Convert a LONGEST to an int. This is used in contexts (e.g. number of
508 arguments to a function, number in a value history, register number, etc.)
509 where the value must not be larger than can fit in an int. */
512 longest_to_int (LONGEST arg)
514 /* Let the compiler do the work */
515 int rtnval = (int) arg;
517 /* Check for overflows or underflows */
518 if (sizeof (LONGEST) > sizeof (int))
522 error (_("Value out of range."));
528 /* Print a floating point value of type TYPE (not always a
529 TYPE_CODE_FLT), pointed to in GDB by VALADDR, on STREAM. */
532 print_floating (const gdb_byte *valaddr, struct type *type,
533 struct ui_file *stream)
537 const struct floatformat *fmt = NULL;
538 unsigned len = TYPE_LENGTH (type);
539 enum float_kind kind;
541 /* If it is a floating-point, check for obvious problems. */
542 if (TYPE_CODE (type) == TYPE_CODE_FLT)
543 fmt = floatformat_from_type (type);
546 kind = floatformat_classify (fmt, valaddr);
547 if (kind == float_nan)
549 if (floatformat_is_negative (fmt, valaddr))
550 fprintf_filtered (stream, "-");
551 fprintf_filtered (stream, "nan(");
552 fputs_filtered ("0x", stream);
553 fputs_filtered (floatformat_mantissa (fmt, valaddr), stream);
554 fprintf_filtered (stream, ")");
557 else if (kind == float_infinite)
559 if (floatformat_is_negative (fmt, valaddr))
560 fputs_filtered ("-", stream);
561 fputs_filtered ("inf", stream);
566 /* NOTE: cagney/2002-01-15: The TYPE passed into print_floating()
567 isn't necessarily a TYPE_CODE_FLT. Consequently, unpack_double
568 needs to be used as that takes care of any necessary type
569 conversions. Such conversions are of course direct to DOUBLEST
570 and disregard any possible target floating point limitations.
571 For instance, a u64 would be converted and displayed exactly on a
572 host with 80 bit DOUBLEST but with loss of information on a host
573 with 64 bit DOUBLEST. */
575 doub = unpack_double (type, valaddr, &inv);
578 fprintf_filtered (stream, "<invalid float value>");
582 /* FIXME: kettenis/2001-01-20: The following code makes too much
583 assumptions about the host and target floating point format. */
585 /* NOTE: cagney/2002-02-03: Since the TYPE of what was passed in may
586 not necessarily be a TYPE_CODE_FLT, the below ignores that and
587 instead uses the type's length to determine the precision of the
588 floating-point value being printed. */
590 if (len < sizeof (double))
591 fprintf_filtered (stream, "%.9g", (double) doub);
592 else if (len == sizeof (double))
593 fprintf_filtered (stream, "%.17g", (double) doub);
595 #ifdef PRINTF_HAS_LONG_DOUBLE
596 fprintf_filtered (stream, "%.35Lg", doub);
598 /* This at least wins with values that are representable as
600 fprintf_filtered (stream, "%.17g", (double) doub);
605 print_decimal_floating (const gdb_byte *valaddr, struct type *type,
606 struct ui_file *stream)
608 char decstr[MAX_DECIMAL_STRING];
609 unsigned len = TYPE_LENGTH (type);
611 decimal_to_string (valaddr, len, decstr);
612 fputs_filtered (decstr, stream);
617 print_binary_chars (struct ui_file *stream, const gdb_byte *valaddr,
618 unsigned len, enum bfd_endian byte_order)
621 #define BITS_IN_BYTES 8
627 /* Declared "int" so it will be signed.
628 * This ensures that right shift will shift in zeros.
630 const int mask = 0x080;
632 /* FIXME: We should be not printing leading zeroes in most cases. */
634 if (byte_order == BFD_ENDIAN_BIG)
640 /* Every byte has 8 binary characters; peel off
641 * and print from the MSB end.
643 for (i = 0; i < (BITS_IN_BYTES * sizeof (*p)); i++)
645 if (*p & (mask >> i))
650 fprintf_filtered (stream, "%1d", b);
656 for (p = valaddr + len - 1;
660 for (i = 0; i < (BITS_IN_BYTES * sizeof (*p)); i++)
662 if (*p & (mask >> i))
667 fprintf_filtered (stream, "%1d", b);
673 /* VALADDR points to an integer of LEN bytes.
674 * Print it in octal on stream or format it in buf.
677 print_octal_chars (struct ui_file *stream, const gdb_byte *valaddr,
678 unsigned len, enum bfd_endian byte_order)
681 unsigned char octa1, octa2, octa3, carry;
684 /* FIXME: We should be not printing leading zeroes in most cases. */
687 /* Octal is 3 bits, which doesn't fit. Yuk. So we have to track
688 * the extra bits, which cycle every three bytes:
692 * bit number 123 456 78 | 9 012 345 6 | 78 901 234 | 567 890 12 |
694 * Octal side: 0 1 carry 3 4 carry ...
696 * Cycle number: 0 1 2
698 * But of course we are printing from the high side, so we have to
699 * figure out where in the cycle we are so that we end up with no
700 * left over bits at the end.
702 #define BITS_IN_OCTAL 3
703 #define HIGH_ZERO 0340
704 #define LOW_ZERO 0016
705 #define CARRY_ZERO 0003
706 #define HIGH_ONE 0200
709 #define CARRY_ONE 0001
710 #define HIGH_TWO 0300
714 /* For 32 we start in cycle 2, with two bits and one bit carry;
715 * for 64 in cycle in cycle 1, with one bit and a two bit carry.
717 cycle = (len * BITS_IN_BYTES) % BITS_IN_OCTAL;
720 fputs_filtered ("0", stream);
721 if (byte_order == BFD_ENDIAN_BIG)
730 /* No carry in, carry out two bits.
732 octa1 = (HIGH_ZERO & *p) >> 5;
733 octa2 = (LOW_ZERO & *p) >> 2;
734 carry = (CARRY_ZERO & *p);
735 fprintf_filtered (stream, "%o", octa1);
736 fprintf_filtered (stream, "%o", octa2);
740 /* Carry in two bits, carry out one bit.
742 octa1 = (carry << 1) | ((HIGH_ONE & *p) >> 7);
743 octa2 = (MID_ONE & *p) >> 4;
744 octa3 = (LOW_ONE & *p) >> 1;
745 carry = (CARRY_ONE & *p);
746 fprintf_filtered (stream, "%o", octa1);
747 fprintf_filtered (stream, "%o", octa2);
748 fprintf_filtered (stream, "%o", octa3);
752 /* Carry in one bit, no carry out.
754 octa1 = (carry << 2) | ((HIGH_TWO & *p) >> 6);
755 octa2 = (MID_TWO & *p) >> 3;
756 octa3 = (LOW_TWO & *p);
758 fprintf_filtered (stream, "%o", octa1);
759 fprintf_filtered (stream, "%o", octa2);
760 fprintf_filtered (stream, "%o", octa3);
764 error (_("Internal error in octal conversion;"));
768 cycle = cycle % BITS_IN_OCTAL;
773 for (p = valaddr + len - 1;
780 /* Carry out, no carry in */
781 octa1 = (HIGH_ZERO & *p) >> 5;
782 octa2 = (LOW_ZERO & *p) >> 2;
783 carry = (CARRY_ZERO & *p);
784 fprintf_filtered (stream, "%o", octa1);
785 fprintf_filtered (stream, "%o", octa2);
789 /* Carry in, carry out */
790 octa1 = (carry << 1) | ((HIGH_ONE & *p) >> 7);
791 octa2 = (MID_ONE & *p) >> 4;
792 octa3 = (LOW_ONE & *p) >> 1;
793 carry = (CARRY_ONE & *p);
794 fprintf_filtered (stream, "%o", octa1);
795 fprintf_filtered (stream, "%o", octa2);
796 fprintf_filtered (stream, "%o", octa3);
800 /* Carry in, no carry out */
801 octa1 = (carry << 2) | ((HIGH_TWO & *p) >> 6);
802 octa2 = (MID_TWO & *p) >> 3;
803 octa3 = (LOW_TWO & *p);
805 fprintf_filtered (stream, "%o", octa1);
806 fprintf_filtered (stream, "%o", octa2);
807 fprintf_filtered (stream, "%o", octa3);
811 error (_("Internal error in octal conversion;"));
815 cycle = cycle % BITS_IN_OCTAL;
821 /* VALADDR points to an integer of LEN bytes.
822 * Print it in decimal on stream or format it in buf.
825 print_decimal_chars (struct ui_file *stream, const gdb_byte *valaddr,
826 unsigned len, enum bfd_endian byte_order)
829 #define CARRY_OUT( x ) ((x) / TEN) /* extend char to int */
830 #define CARRY_LEFT( x ) ((x) % TEN)
831 #define SHIFT( x ) ((x) << 4)
832 #define LOW_NIBBLE( x ) ( (x) & 0x00F)
833 #define HIGH_NIBBLE( x ) (((x) & 0x0F0) >> 4)
836 unsigned char *digits;
839 int i, j, decimal_digits;
843 /* Base-ten number is less than twice as many digits
844 * as the base 16 number, which is 2 digits per byte.
846 decimal_len = len * 2 * 2;
847 digits = xmalloc (decimal_len);
849 for (i = 0; i < decimal_len; i++)
854 /* Ok, we have an unknown number of bytes of data to be printed in
857 * Given a hex number (in nibbles) as XYZ, we start by taking X and
858 * decemalizing it as "x1 x2" in two decimal nibbles. Then we multiply
859 * the nibbles by 16, add Y and re-decimalize. Repeat with Z.
861 * The trick is that "digits" holds a base-10 number, but sometimes
862 * the individual digits are > 10.
864 * Outer loop is per nibble (hex digit) of input, from MSD end to
867 decimal_digits = 0; /* Number of decimal digits so far */
868 p = (byte_order == BFD_ENDIAN_BIG) ? valaddr : valaddr + len - 1;
870 while ((byte_order == BFD_ENDIAN_BIG) ? (p < valaddr + len) : (p >= valaddr))
873 * Multiply current base-ten number by 16 in place.
874 * Each digit was between 0 and 9, now is between
877 for (j = 0; j < decimal_digits; j++)
879 digits[j] = SHIFT (digits[j]);
882 /* Take the next nibble off the input and add it to what
883 * we've got in the LSB position. Bottom 'digit' is now
886 * "flip" is used to run this loop twice for each byte.
892 digits[0] += HIGH_NIBBLE (*p);
897 /* Take low nibble and bump our pointer "p".
899 digits[0] += LOW_NIBBLE (*p);
900 if (byte_order == BFD_ENDIAN_BIG)
907 /* Re-decimalize. We have to do this often enough
908 * that we don't overflow, but once per nibble is
909 * overkill. Easier this way, though. Note that the
910 * carry is often larger than 10 (e.g. max initial
911 * carry out of lowest nibble is 15, could bubble all
912 * the way up greater than 10). So we have to do
913 * the carrying beyond the last current digit.
916 for (j = 0; j < decimal_len - 1; j++)
920 /* "/" won't handle an unsigned char with
921 * a value that if signed would be negative.
922 * So extend to longword int via "dummy".
925 carry = CARRY_OUT (dummy);
926 digits[j] = CARRY_LEFT (dummy);
928 if (j >= decimal_digits && carry == 0)
931 * All higher digits are 0 and we
932 * no longer have a carry.
934 * Note: "j" is 0-based, "decimal_digits" is
937 decimal_digits = j + 1;
943 /* Ok, now "digits" is the decimal representation, with
944 * the "decimal_digits" actual digits. Print!
946 for (i = decimal_digits - 1; i >= 0; i--)
948 fprintf_filtered (stream, "%1d", digits[i]);
953 /* VALADDR points to an integer of LEN bytes. Print it in hex on stream. */
956 print_hex_chars (struct ui_file *stream, const gdb_byte *valaddr,
957 unsigned len, enum bfd_endian byte_order)
961 /* FIXME: We should be not printing leading zeroes in most cases. */
963 fputs_filtered ("0x", stream);
964 if (byte_order == BFD_ENDIAN_BIG)
970 fprintf_filtered (stream, "%02x", *p);
975 for (p = valaddr + len - 1;
979 fprintf_filtered (stream, "%02x", *p);
984 /* VALADDR points to a char integer of LEN bytes. Print it out in appropriate language form on stream.
985 Omit any leading zero chars. */
988 print_char_chars (struct ui_file *stream, struct type *type,
989 const gdb_byte *valaddr,
990 unsigned len, enum bfd_endian byte_order)
994 if (byte_order == BFD_ENDIAN_BIG)
997 while (p < valaddr + len - 1 && *p == 0)
1000 while (p < valaddr + len)
1002 LA_EMIT_CHAR (*p, type, stream, '\'');
1008 p = valaddr + len - 1;
1009 while (p > valaddr && *p == 0)
1012 while (p >= valaddr)
1014 LA_EMIT_CHAR (*p, type, stream, '\'');
1020 /* Assuming TYPE is a simple, non-empty array type, compute its upper
1021 and lower bound. Save the low bound into LOW_BOUND if not NULL.
1022 Save the high bound into HIGH_BOUND if not NULL.
1024 Return 1 if the operation was successful. Return zero otherwise,
1025 in which case the values of LOW_BOUND and HIGH_BOUNDS are unmodified.
1027 Computing the array upper and lower bounds is pretty easy, but this
1028 function does some additional verifications before returning them.
1029 If something incorrect is detected, it is better to return a status
1030 rather than throwing an error, making it easier for the caller to
1031 implement an error-recovery plan. For instance, it may decide to
1032 warn the user that the bounds were not found and then use some
1033 default values instead. */
1036 get_array_bounds (struct type *type, long *low_bound, long *high_bound)
1038 struct type *index = TYPE_INDEX_TYPE (type);
1045 if (TYPE_CODE (index) == TYPE_CODE_RANGE)
1047 low = TYPE_LOW_BOUND (index);
1048 high = TYPE_HIGH_BOUND (index);
1050 else if (TYPE_CODE (index) == TYPE_CODE_ENUM)
1052 const int n_enums = TYPE_NFIELDS (index);
1054 low = TYPE_FIELD_BITPOS (index, 0);
1055 high = TYPE_FIELD_BITPOS (index, n_enums - 1);
1060 /* Abort if the lower bound is greater than the higher bound, except
1061 when low = high + 1. This is a very common idiom used in Ada when
1062 defining empty ranges (for instance "range 1 .. 0"). */
1075 /* Print on STREAM using the given OPTIONS the index for the element
1076 at INDEX of an array whose index type is INDEX_TYPE. */
1079 maybe_print_array_index (struct type *index_type, LONGEST index,
1080 struct ui_file *stream,
1081 const struct value_print_options *options)
1083 struct value *index_value;
1085 if (!options->print_array_indexes)
1088 index_value = value_from_longest (index_type, index);
1090 LA_PRINT_ARRAY_INDEX (index_value, stream, options);
1093 /* Called by various <lang>_val_print routines to print elements of an
1094 array in the form "<elem1>, <elem2>, <elem3>, ...".
1096 (FIXME?) Assumes array element separator is a comma, which is correct
1097 for all languages currently handled.
1098 (FIXME?) Some languages have a notation for repeated array elements,
1099 perhaps we should try to use that notation when appropriate.
1103 val_print_array_elements (struct type *type, const gdb_byte *valaddr,
1104 CORE_ADDR address, struct ui_file *stream,
1106 const struct value_print_options *options,
1109 unsigned int things_printed = 0;
1111 struct type *elttype, *index_type;
1113 /* Position of the array element we are examining to see
1114 whether it is repeated. */
1116 /* Number of repetitions we have detected so far. */
1118 long low_bound_index = 0;
1120 elttype = TYPE_TARGET_TYPE (type);
1121 eltlen = TYPE_LENGTH (check_typedef (elttype));
1122 index_type = TYPE_INDEX_TYPE (type);
1124 /* Compute the number of elements in the array. On most arrays,
1125 the size of its elements is not zero, and so the number of elements
1126 is simply the size of the array divided by the size of the elements.
1127 But for arrays of elements whose size is zero, we need to look at
1130 len = TYPE_LENGTH (type) / eltlen;
1134 if (get_array_bounds (type, &low, &hi))
1138 warning (_("unable to get bounds of array, assuming null array"));
1143 /* Get the array low bound. This only makes sense if the array
1144 has one or more element in it. */
1145 if (len > 0 && !get_array_bounds (type, &low_bound_index, NULL))
1147 warning (_("unable to get low bound of array, using zero as default"));
1148 low_bound_index = 0;
1151 annotate_array_section_begin (i, elttype);
1153 for (; i < len && things_printed < options->print_max; i++)
1157 if (options->prettyprint_arrays)
1159 fprintf_filtered (stream, ",\n");
1160 print_spaces_filtered (2 + 2 * recurse, stream);
1164 fprintf_filtered (stream, ", ");
1167 wrap_here (n_spaces (2 + 2 * recurse));
1168 maybe_print_array_index (index_type, i + low_bound_index,
1173 while ((rep1 < len) &&
1174 !memcmp (valaddr + i * eltlen, valaddr + rep1 * eltlen, eltlen))
1180 if (reps > options->repeat_count_threshold)
1182 val_print (elttype, valaddr + i * eltlen, 0, address + i * eltlen,
1183 stream, recurse + 1, options, current_language);
1184 annotate_elt_rep (reps);
1185 fprintf_filtered (stream, " <repeats %u times>", reps);
1186 annotate_elt_rep_end ();
1189 things_printed += options->repeat_count_threshold;
1193 val_print (elttype, valaddr + i * eltlen, 0, address + i * eltlen,
1194 stream, recurse + 1, options, current_language);
1199 annotate_array_section_end ();
1202 fprintf_filtered (stream, "...");
1206 /* Read LEN bytes of target memory at address MEMADDR, placing the
1207 results in GDB's memory at MYADDR. Returns a count of the bytes
1208 actually read, and optionally an errno value in the location
1209 pointed to by ERRNOPTR if ERRNOPTR is non-null. */
1211 /* FIXME: cagney/1999-10-14: Only used by val_print_string. Can this
1212 function be eliminated. */
1215 partial_memory_read (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int *errnoptr)
1217 int nread; /* Number of bytes actually read. */
1218 int errcode; /* Error from last read. */
1220 /* First try a complete read. */
1221 errcode = target_read_memory (memaddr, myaddr, len);
1229 /* Loop, reading one byte at a time until we get as much as we can. */
1230 for (errcode = 0, nread = 0; len > 0 && errcode == 0; nread++, len--)
1232 errcode = target_read_memory (memaddr++, myaddr++, 1);
1234 /* If an error, the last read was unsuccessful, so adjust count. */
1240 if (errnoptr != NULL)
1242 *errnoptr = errcode;
1247 /* Read a string from the inferior, at ADDR, with LEN characters of WIDTH bytes
1248 each. Fetch at most FETCHLIMIT characters. BUFFER will be set to a newly
1249 allocated buffer containing the string, which the caller is responsible to
1250 free, and BYTES_READ will be set to the number of bytes read. Returns 0 on
1251 success, or errno on failure.
1253 If LEN > 0, reads exactly LEN characters (including eventual NULs in
1254 the middle or end of the string). If LEN is -1, stops at the first
1255 null character (not necessarily the first null byte) up to a maximum
1256 of FETCHLIMIT characters. Set FETCHLIMIT to UINT_MAX to read as many
1257 characters as possible from the string.
1259 Unless an exception is thrown, BUFFER will always be allocated, even on
1260 failure. In this case, some characters might have been read before the
1261 failure happened. Check BYTES_READ to recognize this situation.
1263 Note: There was a FIXME asking to make this code use target_read_string,
1264 but this function is more general (can read past null characters, up to
1265 given LEN). Besides, it is used much more often than target_read_string
1266 so it is more tested. Perhaps callers of target_read_string should use
1267 this function instead? */
1270 read_string (CORE_ADDR addr, int len, int width, unsigned int fetchlimit,
1271 gdb_byte **buffer, int *bytes_read)
1273 int found_nul; /* Non-zero if we found the nul char. */
1274 int errcode; /* Errno returned from bad reads. */
1275 unsigned int nfetch; /* Chars to fetch / chars fetched. */
1276 unsigned int chunksize; /* Size of each fetch, in chars. */
1277 gdb_byte *bufptr; /* Pointer to next available byte in buffer. */
1278 gdb_byte *limit; /* First location past end of fetch buffer. */
1279 struct cleanup *old_chain = NULL; /* Top of the old cleanup chain. */
1281 /* Decide how large of chunks to try to read in one operation. This
1282 is also pretty simple. If LEN >= zero, then we want fetchlimit chars,
1283 so we might as well read them all in one operation. If LEN is -1, we
1284 are looking for a NUL terminator to end the fetching, so we might as
1285 well read in blocks that are large enough to be efficient, but not so
1286 large as to be slow if fetchlimit happens to be large. So we choose the
1287 minimum of 8 and fetchlimit. We used to use 200 instead of 8 but
1288 200 is way too big for remote debugging over a serial line. */
1290 chunksize = (len == -1 ? min (8, fetchlimit) : fetchlimit);
1292 /* Loop until we either have all the characters, or we encounter
1293 some error, such as bumping into the end of the address space. */
1298 old_chain = make_cleanup (free_current_contents, buffer);
1302 *buffer = (gdb_byte *) xmalloc (len * width);
1305 nfetch = partial_memory_read (addr, bufptr, len * width, &errcode)
1307 addr += nfetch * width;
1308 bufptr += nfetch * width;
1312 unsigned long bufsize = 0;
1317 nfetch = min (chunksize, fetchlimit - bufsize);
1319 if (*buffer == NULL)
1320 *buffer = (gdb_byte *) xmalloc (nfetch * width);
1322 *buffer = (gdb_byte *) xrealloc (*buffer,
1323 (nfetch + bufsize) * width);
1325 bufptr = *buffer + bufsize * width;
1328 /* Read as much as we can. */
1329 nfetch = partial_memory_read (addr, bufptr, nfetch * width, &errcode)
1332 /* Scan this chunk for the null character that terminates the string
1333 to print. If found, we don't need to fetch any more. Note
1334 that bufptr is explicitly left pointing at the next character
1335 after the null character, or at the next character after the end
1338 limit = bufptr + nfetch * width;
1339 while (bufptr < limit)
1343 c = extract_unsigned_integer (bufptr, width);
1348 /* We don't care about any error which happened after
1349 the NUL terminator. */
1356 while (errcode == 0 /* no error */
1357 && bufptr - *buffer < fetchlimit * width /* no overrun */
1358 && !found_nul); /* haven't found NUL yet */
1361 { /* Length of string is really 0! */
1362 /* We always allocate *buffer. */
1363 *buffer = bufptr = xmalloc (1);
1367 /* bufptr and addr now point immediately beyond the last byte which we
1368 consider part of the string (including a '\0' which ends the string). */
1369 *bytes_read = bufptr - *buffer;
1373 discard_cleanups (old_chain);
1378 /* Print a string from the inferior, starting at ADDR and printing up to LEN
1379 characters, of WIDTH bytes a piece, to STREAM. If LEN is -1, printing
1380 stops at the first null byte, otherwise printing proceeds (including null
1381 bytes) until either print_max or LEN characters have been printed,
1382 whichever is smaller. */
1385 val_print_string (struct type *elttype, CORE_ADDR addr, int len,
1386 struct ui_file *stream,
1387 const struct value_print_options *options)
1389 int force_ellipsis = 0; /* Force ellipsis to be printed if nonzero. */
1390 int errcode; /* Errno returned from bad reads. */
1391 int found_nul; /* Non-zero if we found the nul char */
1392 unsigned int fetchlimit; /* Maximum number of chars to print. */
1394 gdb_byte *buffer = NULL; /* Dynamically growable fetch buffer. */
1395 struct cleanup *old_chain = NULL; /* Top of the old cleanup chain. */
1396 int width = TYPE_LENGTH (elttype);
1398 /* First we need to figure out the limit on the number of characters we are
1399 going to attempt to fetch and print. This is actually pretty simple. If
1400 LEN >= zero, then the limit is the minimum of LEN and print_max. If
1401 LEN is -1, then the limit is print_max. This is true regardless of
1402 whether print_max is zero, UINT_MAX (unlimited), or something in between,
1403 because finding the null byte (or available memory) is what actually
1404 limits the fetch. */
1406 fetchlimit = (len == -1 ? options->print_max : min (len, options->print_max));
1408 errcode = read_string (addr, len, width, fetchlimit, &buffer, &bytes_read);
1409 old_chain = make_cleanup (xfree, buffer);
1413 /* We now have either successfully filled the buffer to fetchlimit, or
1414 terminated early due to an error or finding a null char when LEN is -1. */
1416 /* Determine found_nul by looking at the last character read. */
1417 found_nul = extract_unsigned_integer (buffer + bytes_read - width, width) == 0;
1419 if (len == -1 && !found_nul)
1423 /* We didn't find a NUL terminator we were looking for. Attempt
1424 to peek at the next character. If not successful, or it is not
1425 a null byte, then force ellipsis to be printed. */
1427 peekbuf = (gdb_byte *) alloca (width);
1429 if (target_read_memory (addr, peekbuf, width) == 0
1430 && extract_unsigned_integer (peekbuf, width) != 0)
1433 else if ((len >= 0 && errcode != 0) || (len > bytes_read / width))
1435 /* Getting an error when we have a requested length, or fetching less
1436 than the number of characters actually requested, always make us
1441 /* If we get an error before fetching anything, don't print a string.
1442 But if we fetch something and then get an error, print the string
1443 and then the error message. */
1444 if (errcode == 0 || bytes_read > 0)
1446 if (options->addressprint)
1448 fputs_filtered (" ", stream);
1450 LA_PRINT_STRING (stream, elttype, buffer, bytes_read / width, force_ellipsis, options);
1457 fprintf_filtered (stream, " <Address ");
1458 fputs_filtered (paddress (addr), stream);
1459 fprintf_filtered (stream, " out of bounds>");
1463 fprintf_filtered (stream, " <Error reading address ");
1464 fputs_filtered (paddress (addr), stream);
1465 fprintf_filtered (stream, ": %s>", safe_strerror (errcode));
1470 do_cleanups (old_chain);
1472 return (bytes_read / width);
1476 /* The 'set input-radix' command writes to this auxiliary variable.
1477 If the requested radix is valid, INPUT_RADIX is updated; otherwise,
1478 it is left unchanged. */
1480 static unsigned input_radix_1 = 10;
1482 /* Validate an input or output radix setting, and make sure the user
1483 knows what they really did here. Radix setting is confusing, e.g.
1484 setting the input radix to "10" never changes it! */
1487 set_input_radix (char *args, int from_tty, struct cmd_list_element *c)
1489 set_input_radix_1 (from_tty, input_radix_1);
1493 set_input_radix_1 (int from_tty, unsigned radix)
1495 /* We don't currently disallow any input radix except 0 or 1, which don't
1496 make any mathematical sense. In theory, we can deal with any input
1497 radix greater than 1, even if we don't have unique digits for every
1498 value from 0 to radix-1, but in practice we lose on large radix values.
1499 We should either fix the lossage or restrict the radix range more.
1504 input_radix_1 = input_radix;
1505 error (_("Nonsense input radix ``decimal %u''; input radix unchanged."),
1508 input_radix_1 = input_radix = radix;
1511 printf_filtered (_("Input radix now set to decimal %u, hex %x, octal %o.\n"),
1512 radix, radix, radix);
1516 /* The 'set output-radix' command writes to this auxiliary variable.
1517 If the requested radix is valid, OUTPUT_RADIX is updated,
1518 otherwise, it is left unchanged. */
1520 static unsigned output_radix_1 = 10;
1523 set_output_radix (char *args, int from_tty, struct cmd_list_element *c)
1525 set_output_radix_1 (from_tty, output_radix_1);
1529 set_output_radix_1 (int from_tty, unsigned radix)
1531 /* Validate the radix and disallow ones that we aren't prepared to
1532 handle correctly, leaving the radix unchanged. */
1536 user_print_options.output_format = 'x'; /* hex */
1539 user_print_options.output_format = 0; /* decimal */
1542 user_print_options.output_format = 'o'; /* octal */
1545 output_radix_1 = output_radix;
1546 error (_("Unsupported output radix ``decimal %u''; output radix unchanged."),
1549 output_radix_1 = output_radix = radix;
1552 printf_filtered (_("Output radix now set to decimal %u, hex %x, octal %o.\n"),
1553 radix, radix, radix);
1557 /* Set both the input and output radix at once. Try to set the output radix
1558 first, since it has the most restrictive range. An radix that is valid as
1559 an output radix is also valid as an input radix.
1561 It may be useful to have an unusual input radix. If the user wishes to
1562 set an input radix that is not valid as an output radix, he needs to use
1563 the 'set input-radix' command. */
1566 set_radix (char *arg, int from_tty)
1570 radix = (arg == NULL) ? 10 : parse_and_eval_long (arg);
1571 set_output_radix_1 (0, radix);
1572 set_input_radix_1 (0, radix);
1575 printf_filtered (_("Input and output radices now set to decimal %u, hex %x, octal %o.\n"),
1576 radix, radix, radix);
1580 /* Show both the input and output radices. */
1583 show_radix (char *arg, int from_tty)
1587 if (input_radix == output_radix)
1589 printf_filtered (_("Input and output radices set to decimal %u, hex %x, octal %o.\n"),
1590 input_radix, input_radix, input_radix);
1594 printf_filtered (_("Input radix set to decimal %u, hex %x, octal %o.\n"),
1595 input_radix, input_radix, input_radix);
1596 printf_filtered (_("Output radix set to decimal %u, hex %x, octal %o.\n"),
1597 output_radix, output_radix, output_radix);
1604 set_print (char *arg, int from_tty)
1607 "\"set print\" must be followed by the name of a print subcommand.\n");
1608 help_list (setprintlist, "set print ", -1, gdb_stdout);
1612 show_print (char *args, int from_tty)
1614 cmd_show_list (showprintlist, from_tty, "");
1618 _initialize_valprint (void)
1620 struct cmd_list_element *c;
1622 add_prefix_cmd ("print", no_class, set_print,
1623 _("Generic command for setting how things print."),
1624 &setprintlist, "set print ", 0, &setlist);
1625 add_alias_cmd ("p", "print", no_class, 1, &setlist);
1626 /* prefer set print to set prompt */
1627 add_alias_cmd ("pr", "print", no_class, 1, &setlist);
1629 add_prefix_cmd ("print", no_class, show_print,
1630 _("Generic command for showing print settings."),
1631 &showprintlist, "show print ", 0, &showlist);
1632 add_alias_cmd ("p", "print", no_class, 1, &showlist);
1633 add_alias_cmd ("pr", "print", no_class, 1, &showlist);
1635 add_setshow_uinteger_cmd ("elements", no_class,
1636 &user_print_options.print_max, _("\
1637 Set limit on string chars or array elements to print."), _("\
1638 Show limit on string chars or array elements to print."), _("\
1639 \"set print elements 0\" causes there to be no limit."),
1642 &setprintlist, &showprintlist);
1644 add_setshow_boolean_cmd ("null-stop", no_class,
1645 &user_print_options.stop_print_at_null, _("\
1646 Set printing of char arrays to stop at first null char."), _("\
1647 Show printing of char arrays to stop at first null char."), NULL,
1649 show_stop_print_at_null,
1650 &setprintlist, &showprintlist);
1652 add_setshow_uinteger_cmd ("repeats", no_class,
1653 &user_print_options.repeat_count_threshold, _("\
1654 Set threshold for repeated print elements."), _("\
1655 Show threshold for repeated print elements."), _("\
1656 \"set print repeats 0\" causes all elements to be individually printed."),
1658 show_repeat_count_threshold,
1659 &setprintlist, &showprintlist);
1661 add_setshow_boolean_cmd ("pretty", class_support,
1662 &user_print_options.prettyprint_structs, _("\
1663 Set prettyprinting of structures."), _("\
1664 Show prettyprinting of structures."), NULL,
1666 show_prettyprint_structs,
1667 &setprintlist, &showprintlist);
1669 add_setshow_boolean_cmd ("union", class_support,
1670 &user_print_options.unionprint, _("\
1671 Set printing of unions interior to structures."), _("\
1672 Show printing of unions interior to structures."), NULL,
1675 &setprintlist, &showprintlist);
1677 add_setshow_boolean_cmd ("array", class_support,
1678 &user_print_options.prettyprint_arrays, _("\
1679 Set prettyprinting of arrays."), _("\
1680 Show prettyprinting of arrays."), NULL,
1682 show_prettyprint_arrays,
1683 &setprintlist, &showprintlist);
1685 add_setshow_boolean_cmd ("address", class_support,
1686 &user_print_options.addressprint, _("\
1687 Set printing of addresses."), _("\
1688 Show printing of addresses."), NULL,
1691 &setprintlist, &showprintlist);
1693 add_setshow_zuinteger_cmd ("input-radix", class_support, &input_radix_1,
1695 Set default input radix for entering numbers."), _("\
1696 Show default input radix for entering numbers."), NULL,
1699 &setlist, &showlist);
1701 add_setshow_zuinteger_cmd ("output-radix", class_support, &output_radix_1,
1703 Set default output radix for printing of values."), _("\
1704 Show default output radix for printing of values."), NULL,
1707 &setlist, &showlist);
1709 /* The "set radix" and "show radix" commands are special in that
1710 they are like normal set and show commands but allow two normally
1711 independent variables to be either set or shown with a single
1712 command. So the usual deprecated_add_set_cmd() and [deleted]
1713 add_show_from_set() commands aren't really appropriate. */
1714 /* FIXME: i18n: With the new add_setshow_integer command, that is no
1715 longer true - show can display anything. */
1716 add_cmd ("radix", class_support, set_radix, _("\
1717 Set default input and output number radices.\n\
1718 Use 'set input-radix' or 'set output-radix' to independently set each.\n\
1719 Without an argument, sets both radices back to the default value of 10."),
1721 add_cmd ("radix", class_support, show_radix, _("\
1722 Show the default input and output number radices.\n\
1723 Use 'show input-radix' or 'show output-radix' to independently show each."),
1726 add_setshow_boolean_cmd ("array-indexes", class_support,
1727 &user_print_options.print_array_indexes, _("\
1728 Set printing of array indexes."), _("\
1729 Show printing of array indexes"), NULL, NULL, show_print_array_indexes,
1730 &setprintlist, &showprintlist);