1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2012 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/>. */
21 #include "gdb_string.h"
27 #include "expression.h"
31 #include "breakpoint.h"
33 #include "gdb-demangle.h"
36 #include "symfile.h" /* for overlay functions */
37 #include "objfiles.h" /* ditto */
38 #include "completer.h" /* for completion functions */
40 #include "gdb_assert.h"
45 #include "exceptions.h"
48 #include "parser-defs.h"
50 #include "arch-utils.h"
51 #include "cli/cli-utils.h"
54 #include "tui/tui.h" /* For tui_active et al. */
57 #if defined(__MINGW32__) && !defined(PRINTF_HAS_LONG_LONG)
58 # define USE_PRINTF_I64 1
59 # define PRINTF_HAS_LONG_LONG
61 # define USE_PRINTF_I64 0
70 /* True if the value should be printed raw -- that is, bypassing
71 python-based formatters. */
75 /* Last specified output format. */
77 static char last_format
= 0;
79 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
81 static char last_size
= 'w';
83 /* Default address to examine next, and associated architecture. */
85 static struct gdbarch
*next_gdbarch
;
86 static CORE_ADDR next_address
;
88 /* Number of delay instructions following current disassembled insn. */
90 static int branch_delay_insns
;
92 /* Last address examined. */
94 static CORE_ADDR last_examine_address
;
96 /* Contents of last address examined.
97 This is not valid past the end of the `x' command! */
99 static struct value
*last_examine_value
;
101 /* Largest offset between a symbolic value and an address, that will be
102 printed as `0x1234 <symbol+offset>'. */
104 static unsigned int max_symbolic_offset
= UINT_MAX
;
106 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
107 struct cmd_list_element
*c
, const char *value
)
109 fprintf_filtered (file
,
110 _("The largest offset that will be "
111 "printed in <symbol+1234> form is %s.\n"),
115 /* Append the source filename and linenumber of the symbol when
116 printing a symbolic value as `<symbol at filename:linenum>' if set. */
117 static int print_symbol_filename
= 0;
119 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
120 struct cmd_list_element
*c
, const char *value
)
122 fprintf_filtered (file
, _("Printing of source filename and "
123 "line number with <symbol> is %s.\n"),
127 /* Number of auto-display expression currently being displayed.
128 So that we can disable it if we get a signal within it.
129 -1 when not doing one. */
131 int current_display_number
;
135 /* Chain link to next auto-display item. */
136 struct display
*next
;
138 /* The expression as the user typed it. */
141 /* Expression to be evaluated and displayed. */
142 struct expression
*exp
;
144 /* Item number of this auto-display item. */
147 /* Display format specified. */
148 struct format_data format
;
150 /* Program space associated with `block'. */
151 struct program_space
*pspace
;
153 /* Innermost block required by this expression when evaluated. */
156 /* Status of this display (enabled or disabled). */
160 /* Chain of expressions whose values should be displayed
161 automatically each time the program stops. */
163 static struct display
*display_chain
;
165 static int display_number
;
167 /* Walk the following statement or block through all displays.
168 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
171 #define ALL_DISPLAYS(B) \
172 for (B = display_chain; B; B = B->next)
174 #define ALL_DISPLAYS_SAFE(B,TMP) \
175 for (B = display_chain; \
176 B ? (TMP = B->next, 1): 0; \
179 /* Prototypes for exported functions. */
181 void output_command (char *, int);
183 void _initialize_printcmd (void);
185 /* Prototypes for local functions. */
187 static void do_one_display (struct display
*);
190 /* Decode a format specification. *STRING_PTR should point to it.
191 OFORMAT and OSIZE are used as defaults for the format and size
192 if none are given in the format specification.
193 If OSIZE is zero, then the size field of the returned value
194 should be set only if a size is explicitly specified by the
196 The structure returned describes all the data
197 found in the specification. In addition, *STRING_PTR is advanced
198 past the specification and past all whitespace following it. */
200 static struct format_data
201 decode_format (char **string_ptr
, int oformat
, int osize
)
203 struct format_data val
;
204 char *p
= *string_ptr
;
211 if (*p
>= '0' && *p
<= '9')
212 val
.count
= atoi (p
);
213 while (*p
>= '0' && *p
<= '9')
216 /* Now process size or format letters that follow. */
220 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
227 else if (*p
>= 'a' && *p
<= 'z')
233 while (*p
== ' ' || *p
== '\t')
237 /* Set defaults for format and size if not specified. */
238 if (val
.format
== '?')
242 /* Neither has been specified. */
243 val
.format
= oformat
;
247 /* If a size is specified, any format makes a reasonable
248 default except 'i'. */
249 val
.format
= oformat
== 'i' ? 'x' : oformat
;
251 else if (val
.size
== '?')
255 /* Pick the appropriate size for an address. This is deferred
256 until do_examine when we know the actual architecture to use.
257 A special size value of 'a' is used to indicate this case. */
258 val
.size
= osize
? 'a' : osize
;
261 /* Floating point has to be word or giantword. */
262 if (osize
== 'w' || osize
== 'g')
265 /* Default it to giantword if the last used size is not
267 val
.size
= osize
? 'g' : osize
;
270 /* Characters default to one byte. */
271 val
.size
= osize
? 'b' : osize
;
274 /* Display strings with byte size chars unless explicitly
280 /* The default is the size most recently specified. */
287 /* Print value VAL on stream according to OPTIONS.
288 Do not end with a newline.
289 SIZE is the letter for the size of datum being printed.
290 This is used to pad hex numbers so they line up. SIZE is 0
291 for print / output and set for examine. */
294 print_formatted (struct value
*val
, int size
,
295 const struct value_print_options
*options
,
296 struct ui_file
*stream
)
298 struct type
*type
= check_typedef (value_type (val
));
299 int len
= TYPE_LENGTH (type
);
301 if (VALUE_LVAL (val
) == lval_memory
)
302 next_address
= value_address (val
) + len
;
306 switch (options
->format
)
310 struct type
*elttype
= value_type (val
);
312 next_address
= (value_address (val
)
313 + val_print_string (elttype
, NULL
,
314 value_address (val
), -1,
315 stream
, options
) * len
);
320 /* We often wrap here if there are long symbolic names. */
322 next_address
= (value_address (val
)
323 + gdb_print_insn (get_type_arch (type
),
324 value_address (val
), stream
,
325 &branch_delay_insns
));
330 if (options
->format
== 0 || options
->format
== 's'
331 || TYPE_CODE (type
) == TYPE_CODE_REF
332 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
333 || TYPE_CODE (type
) == TYPE_CODE_STRING
334 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
335 || TYPE_CODE (type
) == TYPE_CODE_UNION
336 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
337 value_print (val
, stream
, options
);
339 /* User specified format, so don't look to the type to tell us
341 val_print_scalar_formatted (type
,
342 value_contents_for_printing (val
),
343 value_embedded_offset (val
),
345 options
, size
, stream
);
348 /* Return builtin floating point type of same length as TYPE.
349 If no such type is found, return TYPE itself. */
351 float_type_from_length (struct type
*type
)
353 struct gdbarch
*gdbarch
= get_type_arch (type
);
354 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
355 unsigned int len
= TYPE_LENGTH (type
);
357 if (len
== TYPE_LENGTH (builtin
->builtin_float
))
358 type
= builtin
->builtin_float
;
359 else if (len
== TYPE_LENGTH (builtin
->builtin_double
))
360 type
= builtin
->builtin_double
;
361 else if (len
== TYPE_LENGTH (builtin
->builtin_long_double
))
362 type
= builtin
->builtin_long_double
;
367 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
368 according to OPTIONS and SIZE on STREAM. Formats s and i are not
369 supported at this level. */
372 print_scalar_formatted (const void *valaddr
, struct type
*type
,
373 const struct value_print_options
*options
,
374 int size
, struct ui_file
*stream
)
376 struct gdbarch
*gdbarch
= get_type_arch (type
);
377 LONGEST val_long
= 0;
378 unsigned int len
= TYPE_LENGTH (type
);
379 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
381 /* String printing should go through val_print_scalar_formatted. */
382 gdb_assert (options
->format
!= 's');
384 if (len
> sizeof(LONGEST
) &&
385 (TYPE_CODE (type
) == TYPE_CODE_INT
386 || TYPE_CODE (type
) == TYPE_CODE_ENUM
))
388 switch (options
->format
)
391 print_octal_chars (stream
, valaddr
, len
, byte_order
);
395 print_decimal_chars (stream
, valaddr
, len
, byte_order
);
398 print_binary_chars (stream
, valaddr
, len
, byte_order
);
401 print_hex_chars (stream
, valaddr
, len
, byte_order
);
404 print_char_chars (stream
, type
, valaddr
, len
, byte_order
);
411 if (options
->format
!= 'f')
412 val_long
= unpack_long (type
, valaddr
);
414 /* If the value is a pointer, and pointers and addresses are not the
415 same, then at this point, the value's length (in target bytes) is
416 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
417 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
418 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
420 /* If we are printing it as unsigned, truncate it in case it is actually
421 a negative signed value (e.g. "print/u (short)-1" should print 65535
422 (if shorts are 16 bits) instead of 4294967295). */
423 if (options
->format
!= 'd' || TYPE_UNSIGNED (type
))
425 if (len
< sizeof (LONGEST
))
426 val_long
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* len
) - 1;
429 switch (options
->format
)
434 /* No size specified, like in print. Print varying # of digits. */
435 print_longest (stream
, 'x', 1, val_long
);
444 print_longest (stream
, size
, 1, val_long
);
447 error (_("Undefined output size \"%c\"."), size
);
452 print_longest (stream
, 'd', 1, val_long
);
456 print_longest (stream
, 'u', 0, val_long
);
461 print_longest (stream
, 'o', 1, val_long
);
463 fprintf_filtered (stream
, "0");
468 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
470 print_address (gdbarch
, addr
, stream
);
476 struct value_print_options opts
= *options
;
479 if (TYPE_UNSIGNED (type
))
480 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
482 type
= builtin_type (gdbarch
)->builtin_true_char
;
484 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
489 type
= float_type_from_length (type
);
490 print_floating (valaddr
, type
, stream
);
494 internal_error (__FILE__
, __LINE__
,
495 _("failed internal consistency check"));
498 /* Binary; 't' stands for "two". */
500 char bits
[8 * (sizeof val_long
) + 1];
501 char buf
[8 * (sizeof val_long
) + 32];
506 width
= 8 * (sizeof val_long
);
523 error (_("Undefined output size \"%c\"."), size
);
529 bits
[width
] = (val_long
& 1) ? '1' : '0';
534 while (*cp
&& *cp
== '0')
539 strncpy (buf
, cp
, sizeof (bits
));
540 fputs_filtered (buf
, stream
);
545 error (_("Undefined output format \"%c\"."), options
->format
);
549 /* Specify default address for `x' command.
550 The `info lines' command uses this. */
553 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
555 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
557 next_gdbarch
= gdbarch
;
560 /* Make address available to the user as $_. */
561 set_internalvar (lookup_internalvar ("_"),
562 value_from_pointer (ptr_type
, addr
));
565 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
566 after LEADIN. Print nothing if no symbolic name is found nearby.
567 Optionally also print source file and line number, if available.
568 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
569 or to interpret it as a possible C++ name and convert it back to source
570 form. However note that DO_DEMANGLE can be overridden by the specific
571 settings of the demangle and asm_demangle variables. */
574 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
575 struct ui_file
*stream
,
576 int do_demangle
, char *leadin
)
579 char *filename
= NULL
;
584 /* Throw away both name and filename. */
585 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
586 make_cleanup (free_current_contents
, &filename
);
588 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
589 &filename
, &line
, &unmapped
))
591 do_cleanups (cleanup_chain
);
595 fputs_filtered (leadin
, stream
);
597 fputs_filtered ("<*", stream
);
599 fputs_filtered ("<", stream
);
600 fputs_filtered (name
, stream
);
602 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
604 /* Append source filename and line number if desired. Give specific
605 line # of this addr, if we have it; else line # of the nearest symbol. */
606 if (print_symbol_filename
&& filename
!= NULL
)
609 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
611 fprintf_filtered (stream
, " in %s", filename
);
614 fputs_filtered ("*>", stream
);
616 fputs_filtered (">", stream
);
618 do_cleanups (cleanup_chain
);
621 /* Given an address ADDR return all the elements needed to print the
622 address in a symbolic form. NAME can be mangled or not depending
623 on DO_DEMANGLE (and also on the asm_demangle global variable,
624 manipulated via ''set print asm-demangle''). Return 0 in case of
625 success, when all the info in the OUT paramters is valid. Return 1
628 build_address_symbolic (struct gdbarch
*gdbarch
,
629 CORE_ADDR addr
, /* IN */
630 int do_demangle
, /* IN */
631 char **name
, /* OUT */
632 int *offset
, /* OUT */
633 char **filename
, /* OUT */
635 int *unmapped
) /* OUT */
637 struct minimal_symbol
*msymbol
;
638 struct symbol
*symbol
;
639 CORE_ADDR name_location
= 0;
640 struct obj_section
*section
= NULL
;
641 const char *name_temp
= "";
643 /* Let's say it is mapped (not unmapped). */
646 /* Determine if the address is in an overlay, and whether it is
648 if (overlay_debugging
)
650 section
= find_pc_overlay (addr
);
651 if (pc_in_unmapped_range (addr
, section
))
654 addr
= overlay_mapped_address (addr
, section
);
658 /* First try to find the address in the symbol table, then
659 in the minsyms. Take the closest one. */
661 /* This is defective in the sense that it only finds text symbols. So
662 really this is kind of pointless--we should make sure that the
663 minimal symbols have everything we need (by changing that we could
664 save some memory, but for many debug format--ELF/DWARF or
665 anything/stabs--it would be inconvenient to eliminate those minimal
667 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
668 symbol
= find_pc_sect_function (addr
, section
);
672 /* If this is a function (i.e. a code address), strip out any
673 non-address bits. For instance, display a pointer to the
674 first instruction of a Thumb function as <function>; the
675 second instruction will be <function+2>, even though the
676 pointer is <function+3>. This matches the ISA behavior. */
677 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
679 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
680 if (do_demangle
|| asm_demangle
)
681 name_temp
= SYMBOL_PRINT_NAME (symbol
);
683 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
688 if (SYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
690 /* The msymbol is closer to the address than the symbol;
691 use the msymbol instead. */
693 name_location
= SYMBOL_VALUE_ADDRESS (msymbol
);
694 if (do_demangle
|| asm_demangle
)
695 name_temp
= SYMBOL_PRINT_NAME (msymbol
);
697 name_temp
= SYMBOL_LINKAGE_NAME (msymbol
);
700 if (symbol
== NULL
&& msymbol
== NULL
)
703 /* If the nearest symbol is too far away, don't print anything symbolic. */
705 /* For when CORE_ADDR is larger than unsigned int, we do math in
706 CORE_ADDR. But when we detect unsigned wraparound in the
707 CORE_ADDR math, we ignore this test and print the offset,
708 because addr+max_symbolic_offset has wrapped through the end
709 of the address space back to the beginning, giving bogus comparison. */
710 if (addr
> name_location
+ max_symbolic_offset
711 && name_location
+ max_symbolic_offset
> name_location
)
714 *offset
= addr
- name_location
;
716 *name
= xstrdup (name_temp
);
718 if (print_symbol_filename
)
720 struct symtab_and_line sal
;
722 sal
= find_pc_sect_line (addr
, section
, 0);
726 *filename
= xstrdup (sal
.symtab
->filename
);
734 /* Print address ADDR symbolically on STREAM.
735 First print it as a number. Then perhaps print
736 <SYMBOL + OFFSET> after the number. */
739 print_address (struct gdbarch
*gdbarch
,
740 CORE_ADDR addr
, struct ui_file
*stream
)
742 fputs_filtered (paddress (gdbarch
, addr
), stream
);
743 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
746 /* Return a prefix for instruction address:
747 "=> " for current instruction, else " ". */
750 pc_prefix (CORE_ADDR addr
)
752 if (has_stack_frames ())
754 struct frame_info
*frame
;
757 frame
= get_selected_frame (NULL
);
758 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
764 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
765 controls whether to print the symbolic name "raw" or demangled.
766 Global setting "addressprint" controls whether to print hex address
770 print_address_demangle (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
771 struct ui_file
*stream
, int do_demangle
)
773 struct value_print_options opts
;
775 get_user_print_options (&opts
);
778 fprintf_filtered (stream
, "0");
780 else if (opts
.addressprint
)
782 fputs_filtered (paddress (gdbarch
, addr
), stream
);
783 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
787 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
792 /* Examine data at address ADDR in format FMT.
793 Fetch it from memory and print on gdb_stdout. */
796 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
801 struct type
*val_type
= NULL
;
804 struct value_print_options opts
;
809 next_gdbarch
= gdbarch
;
812 /* Instruction format implies fetch single bytes
813 regardless of the specified size.
814 The case of strings is handled in decode_format, only explicit
815 size operator are not changed to 'b'. */
821 /* Pick the appropriate size for an address. */
822 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
824 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
826 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
829 /* Bad value for gdbarch_ptr_bit. */
830 internal_error (__FILE__
, __LINE__
,
831 _("failed internal consistency check"));
835 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
836 else if (size
== 'h')
837 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
838 else if (size
== 'w')
839 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
840 else if (size
== 'g')
841 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
845 struct type
*char_type
= NULL
;
847 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
848 if type is not found. */
850 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
851 else if (size
== 'w')
852 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
854 val_type
= char_type
;
857 if (size
!= '\0' && size
!= 'b')
858 warning (_("Unable to display strings with "
859 "size '%c', using 'b' instead."), size
);
861 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
870 if (format
== 's' || format
== 'i')
873 get_formatted_print_options (&opts
, format
);
875 /* Print as many objects as specified in COUNT, at most maxelts per line,
876 with the address of the next one at the start of each line. */
882 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
883 print_address (next_gdbarch
, next_address
, gdb_stdout
);
884 printf_filtered (":");
889 printf_filtered ("\t");
890 /* Note that print_formatted sets next_address for the next
892 last_examine_address
= next_address
;
894 if (last_examine_value
)
895 value_free (last_examine_value
);
897 /* The value to be displayed is not fetched greedily.
898 Instead, to avoid the possibility of a fetched value not
899 being used, its retrieval is delayed until the print code
900 uses it. When examining an instruction stream, the
901 disassembler will perform its own memory fetch using just
902 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
903 the disassembler be modified so that LAST_EXAMINE_VALUE
904 is left with the byte sequence from the last complete
905 instruction fetched from memory? */
906 last_examine_value
= value_at_lazy (val_type
, next_address
);
908 if (last_examine_value
)
909 release_value (last_examine_value
);
911 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
913 /* Display any branch delay slots following the final insn. */
914 if (format
== 'i' && count
== 1)
915 count
+= branch_delay_insns
;
917 printf_filtered ("\n");
918 gdb_flush (gdb_stdout
);
923 validate_format (struct format_data fmt
, char *cmdname
)
926 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
928 error (_("Item count other than 1 is meaningless in \"%s\" command."),
930 if (fmt
.format
== 'i')
931 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
932 fmt
.format
, cmdname
);
935 /* Evaluate string EXP as an expression in the current language and
936 print the resulting value. EXP may contain a format specifier as the
937 first argument ("/x myvar" for example, to print myvar in hex). */
940 print_command_1 (char *exp
, int inspect
, int voidprint
)
942 struct expression
*expr
;
943 struct cleanup
*old_chain
= 0;
946 struct format_data fmt
;
949 if (exp
&& *exp
== '/')
952 fmt
= decode_format (&exp
, last_format
, 0);
953 validate_format (fmt
, "print");
954 last_format
= format
= fmt
.format
;
966 expr
= parse_expression (exp
);
967 old_chain
= make_cleanup (free_current_contents
, &expr
);
969 val
= evaluate_expression (expr
);
972 val
= access_value_history (0);
974 if (voidprint
|| (val
&& value_type (val
) &&
975 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
977 struct value_print_options opts
;
978 int histindex
= record_latest_value (val
);
981 annotate_value_history_begin (histindex
, value_type (val
));
983 annotate_value_begin (value_type (val
));
986 printf_unfiltered ("\031(gdb-makebuffer \"%s\" %d '(\"",
988 else if (histindex
>= 0)
989 printf_filtered ("$%d = ", histindex
);
992 annotate_value_history_value ();
994 get_formatted_print_options (&opts
, format
);
995 opts
.inspect_it
= inspect
;
998 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
999 printf_filtered ("\n");
1002 annotate_value_history_end ();
1004 annotate_value_end ();
1007 printf_unfiltered ("\") )\030");
1011 do_cleanups (old_chain
);
1015 print_command (char *exp
, int from_tty
)
1017 print_command_1 (exp
, 0, 1);
1020 /* Same as print, except in epoch, it gets its own window. */
1022 inspect_command (char *exp
, int from_tty
)
1024 extern int epoch_interface
;
1026 print_command_1 (exp
, epoch_interface
, 1);
1029 /* Same as print, except it doesn't print void results. */
1031 call_command (char *exp
, int from_tty
)
1033 print_command_1 (exp
, 0, 0);
1037 output_command (char *exp
, int from_tty
)
1039 struct expression
*expr
;
1040 struct cleanup
*old_chain
;
1043 struct format_data fmt
;
1044 struct value_print_options opts
;
1049 if (exp
&& *exp
== '/')
1052 fmt
= decode_format (&exp
, 0, 0);
1053 validate_format (fmt
, "output");
1054 format
= fmt
.format
;
1057 expr
= parse_expression (exp
);
1058 old_chain
= make_cleanup (free_current_contents
, &expr
);
1060 val
= evaluate_expression (expr
);
1062 annotate_value_begin (value_type (val
));
1064 get_formatted_print_options (&opts
, format
);
1066 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1068 annotate_value_end ();
1071 gdb_flush (gdb_stdout
);
1073 do_cleanups (old_chain
);
1077 set_command (char *exp
, int from_tty
)
1079 struct expression
*expr
= parse_expression (exp
);
1080 struct cleanup
*old_chain
=
1081 make_cleanup (free_current_contents
, &expr
);
1083 if (expr
->nelts
>= 1
1084 && expr
->elts
[0].opcode
!= BINOP_ASSIGN
1085 && expr
->elts
[0].opcode
!= BINOP_ASSIGN_MODIFY
1086 && expr
->elts
[0].opcode
!= BINOP_COMMA
)
1087 warning (_("Expression is not an assignment (and might have no effect)"));
1089 evaluate_expression (expr
);
1090 do_cleanups (old_chain
);
1094 sym_info (char *arg
, int from_tty
)
1096 struct minimal_symbol
*msymbol
;
1097 struct objfile
*objfile
;
1098 struct obj_section
*osect
;
1099 CORE_ADDR addr
, sect_addr
;
1101 unsigned int offset
;
1104 error_no_arg (_("address"));
1106 addr
= parse_and_eval_address (arg
);
1107 ALL_OBJSECTIONS (objfile
, osect
)
1109 /* Only process each object file once, even if there's a separate
1111 if (objfile
->separate_debug_objfile_backlink
)
1114 sect_addr
= overlay_mapped_address (addr
, osect
);
1116 if (obj_section_addr (osect
) <= sect_addr
1117 && sect_addr
< obj_section_endaddr (osect
)
1118 && (msymbol
= lookup_minimal_symbol_by_pc_section (sect_addr
, osect
)))
1120 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1122 struct cleanup
*old_chain
;
1125 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1126 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1127 sec_name
= osect
->the_bfd_section
->name
;
1128 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1130 /* Don't print the offset if it is zero.
1131 We assume there's no need to handle i18n of "sym + offset". */
1133 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1135 loc_string
= xstrprintf ("%s", msym_name
);
1137 /* Use a cleanup to free loc_string in case the user quits
1138 a pagination request inside printf_filtered. */
1139 old_chain
= make_cleanup (xfree
, loc_string
);
1141 gdb_assert (osect
->objfile
&& osect
->objfile
->name
);
1142 obj_name
= osect
->objfile
->name
;
1144 if (MULTI_OBJFILE_P ())
1145 if (pc_in_unmapped_range (addr
, osect
))
1146 if (section_is_overlay (osect
))
1147 printf_filtered (_("%s in load address range of "
1148 "%s overlay section %s of %s\n"),
1149 loc_string
, mapped
, sec_name
, obj_name
);
1151 printf_filtered (_("%s in load address range of "
1152 "section %s of %s\n"),
1153 loc_string
, sec_name
, obj_name
);
1155 if (section_is_overlay (osect
))
1156 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1157 loc_string
, mapped
, sec_name
, obj_name
);
1159 printf_filtered (_("%s in section %s of %s\n"),
1160 loc_string
, sec_name
, obj_name
);
1162 if (pc_in_unmapped_range (addr
, osect
))
1163 if (section_is_overlay (osect
))
1164 printf_filtered (_("%s in load address range of %s overlay "
1166 loc_string
, mapped
, sec_name
);
1168 printf_filtered (_("%s in load address range of section %s\n"),
1169 loc_string
, sec_name
);
1171 if (section_is_overlay (osect
))
1172 printf_filtered (_("%s in %s overlay section %s\n"),
1173 loc_string
, mapped
, sec_name
);
1175 printf_filtered (_("%s in section %s\n"),
1176 loc_string
, sec_name
);
1178 do_cleanups (old_chain
);
1182 printf_filtered (_("No symbol matches %s.\n"), arg
);
1186 address_info (char *exp
, int from_tty
)
1188 struct gdbarch
*gdbarch
;
1191 struct minimal_symbol
*msymbol
;
1193 struct obj_section
*section
;
1194 CORE_ADDR load_addr
, context_pc
= 0;
1195 int is_a_field_of_this
; /* C++: lookup_symbol sets this to nonzero
1196 if exp is a field of `this'. */
1199 error (_("Argument required."));
1201 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1202 &is_a_field_of_this
);
1205 if (is_a_field_of_this
)
1207 printf_filtered ("Symbol \"");
1208 fprintf_symbol_filtered (gdb_stdout
, exp
,
1209 current_language
->la_language
, DMGL_ANSI
);
1210 printf_filtered ("\" is a field of the local class variable ");
1211 if (current_language
->la_language
== language_objc
)
1212 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1214 printf_filtered ("`this'\n");
1218 msymbol
= lookup_minimal_symbol (exp
, NULL
, NULL
);
1220 if (msymbol
!= NULL
)
1222 gdbarch
= get_objfile_arch (msymbol_objfile (msymbol
));
1223 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1225 printf_filtered ("Symbol \"");
1226 fprintf_symbol_filtered (gdb_stdout
, exp
,
1227 current_language
->la_language
, DMGL_ANSI
);
1228 printf_filtered ("\" is at ");
1229 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1230 printf_filtered (" in a file compiled without debugging");
1231 section
= SYMBOL_OBJ_SECTION (msymbol
);
1232 if (section_is_overlay (section
))
1234 load_addr
= overlay_unmapped_address (load_addr
, section
);
1235 printf_filtered (",\n -- loaded at ");
1236 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1237 printf_filtered (" in overlay section %s",
1238 section
->the_bfd_section
->name
);
1240 printf_filtered (".\n");
1243 error (_("No symbol \"%s\" in current context."), exp
);
1247 printf_filtered ("Symbol \"");
1248 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1249 current_language
->la_language
, DMGL_ANSI
);
1250 printf_filtered ("\" is ");
1251 val
= SYMBOL_VALUE (sym
);
1252 section
= SYMBOL_OBJ_SECTION (sym
);
1253 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1255 switch (SYMBOL_CLASS (sym
))
1258 case LOC_CONST_BYTES
:
1259 printf_filtered ("constant");
1263 printf_filtered ("a label at address ");
1264 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1265 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1266 if (section_is_overlay (section
))
1268 load_addr
= overlay_unmapped_address (load_addr
, section
);
1269 printf_filtered (",\n -- loaded at ");
1270 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1271 printf_filtered (" in overlay section %s",
1272 section
->the_bfd_section
->name
);
1277 /* FIXME: cagney/2004-01-26: It should be possible to
1278 unconditionally call the SYMBOL_COMPUTED_OPS method when available.
1279 Unfortunately DWARF 2 stores the frame-base (instead of the
1280 function) location in a function's symbol. Oops! For the
1281 moment enable this when/where applicable. */
1282 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1287 /* GDBARCH is the architecture associated with the objfile the symbol
1288 is defined in; the target architecture may be different, and may
1289 provide additional registers. However, we do not know the target
1290 architecture at this point. We assume the objfile architecture
1291 will contain all the standard registers that occur in debug info
1293 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1295 if (SYMBOL_IS_ARGUMENT (sym
))
1296 printf_filtered (_("an argument in register %s"),
1297 gdbarch_register_name (gdbarch
, regno
));
1299 printf_filtered (_("a variable in register %s"),
1300 gdbarch_register_name (gdbarch
, regno
));
1304 printf_filtered (_("static storage at address "));
1305 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1306 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1307 if (section_is_overlay (section
))
1309 load_addr
= overlay_unmapped_address (load_addr
, section
);
1310 printf_filtered (_(",\n -- loaded at "));
1311 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1312 printf_filtered (_(" in overlay section %s"),
1313 section
->the_bfd_section
->name
);
1317 case LOC_REGPARM_ADDR
:
1318 /* Note comment at LOC_REGISTER. */
1319 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1320 printf_filtered (_("address of an argument in register %s"),
1321 gdbarch_register_name (gdbarch
, regno
));
1325 printf_filtered (_("an argument at offset %ld"), val
);
1329 printf_filtered (_("a local variable at frame offset %ld"), val
);
1333 printf_filtered (_("a reference argument at offset %ld"), val
);
1337 printf_filtered (_("a typedef"));
1341 printf_filtered (_("a function at address "));
1342 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1343 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1344 if (section_is_overlay (section
))
1346 load_addr
= overlay_unmapped_address (load_addr
, section
);
1347 printf_filtered (_(",\n -- loaded at "));
1348 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1349 printf_filtered (_(" in overlay section %s"),
1350 section
->the_bfd_section
->name
);
1354 case LOC_UNRESOLVED
:
1356 struct minimal_symbol
*msym
;
1358 msym
= lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (sym
), NULL
, NULL
);
1360 printf_filtered ("unresolved");
1363 section
= SYMBOL_OBJ_SECTION (msym
);
1364 load_addr
= SYMBOL_VALUE_ADDRESS (msym
);
1367 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1368 printf_filtered (_("a thread-local variable at offset %s "
1369 "in the thread-local storage for `%s'"),
1370 paddress (gdbarch
, load_addr
),
1371 section
->objfile
->name
);
1374 printf_filtered (_("static storage at address "));
1375 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1376 if (section_is_overlay (section
))
1378 load_addr
= overlay_unmapped_address (load_addr
, section
);
1379 printf_filtered (_(",\n -- loaded at "));
1380 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1381 printf_filtered (_(" in overlay section %s"),
1382 section
->the_bfd_section
->name
);
1389 case LOC_OPTIMIZED_OUT
:
1390 printf_filtered (_("optimized out"));
1394 printf_filtered (_("of unknown (botched) type"));
1397 printf_filtered (".\n");
1402 x_command (char *exp
, int from_tty
)
1404 struct expression
*expr
;
1405 struct format_data fmt
;
1406 struct cleanup
*old_chain
;
1409 fmt
.format
= last_format
? last_format
: 'x';
1410 fmt
.size
= last_size
;
1414 if (exp
&& *exp
== '/')
1417 fmt
= decode_format (&exp
, last_format
, last_size
);
1420 /* If we have an expression, evaluate it and use it as the address. */
1422 if (exp
!= 0 && *exp
!= 0)
1424 expr
= parse_expression (exp
);
1425 /* Cause expression not to be there any more if this command is
1426 repeated with Newline. But don't clobber a user-defined
1427 command's definition. */
1430 old_chain
= make_cleanup (free_current_contents
, &expr
);
1431 val
= evaluate_expression (expr
);
1432 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1433 val
= coerce_ref (val
);
1434 /* In rvalue contexts, such as this, functions are coerced into
1435 pointers to functions. This makes "x/i main" work. */
1436 if (/* last_format == 'i' && */
1437 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1438 && VALUE_LVAL (val
) == lval_memory
)
1439 next_address
= value_address (val
);
1441 next_address
= value_as_address (val
);
1443 next_gdbarch
= expr
->gdbarch
;
1444 do_cleanups (old_chain
);
1448 error_no_arg (_("starting display address"));
1450 do_examine (fmt
, next_gdbarch
, next_address
);
1452 /* If the examine succeeds, we remember its size and format for next
1453 time. Set last_size to 'b' for strings. */
1454 if (fmt
.format
== 's')
1457 last_size
= fmt
.size
;
1458 last_format
= fmt
.format
;
1460 /* Set a couple of internal variables if appropriate. */
1461 if (last_examine_value
)
1463 /* Make last address examined available to the user as $_. Use
1464 the correct pointer type. */
1465 struct type
*pointer_type
1466 = lookup_pointer_type (value_type (last_examine_value
));
1467 set_internalvar (lookup_internalvar ("_"),
1468 value_from_pointer (pointer_type
,
1469 last_examine_address
));
1471 /* Make contents of last address examined available to the user
1472 as $__. If the last value has not been fetched from memory
1473 then don't fetch it now; instead mark it by voiding the $__
1475 if (value_lazy (last_examine_value
))
1476 clear_internalvar (lookup_internalvar ("__"));
1478 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1483 /* Add an expression to the auto-display chain.
1484 Specify the expression. */
1487 display_command (char *exp
, int from_tty
)
1489 struct format_data fmt
;
1490 struct expression
*expr
;
1491 struct display
*new;
1495 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1497 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1498 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1512 fmt
= decode_format (&exp
, 0, 0);
1513 if (fmt
.size
&& fmt
.format
== 0)
1515 if (fmt
.format
== 'i' || fmt
.format
== 's')
1526 innermost_block
= NULL
;
1527 expr
= parse_expression (exp
);
1529 new = (struct display
*) xmalloc (sizeof (struct display
));
1531 new->exp_string
= xstrdup (exp
);
1533 new->block
= innermost_block
;
1534 new->pspace
= current_program_space
;
1535 new->next
= display_chain
;
1536 new->number
= ++display_number
;
1539 display_chain
= new;
1541 if (from_tty
&& target_has_execution
)
1542 do_one_display (new);
1549 free_display (struct display
*d
)
1551 xfree (d
->exp_string
);
1556 /* Clear out the display_chain. Done when new symtabs are loaded,
1557 since this invalidates the types stored in many expressions. */
1560 clear_displays (void)
1564 while ((d
= display_chain
) != NULL
)
1566 display_chain
= d
->next
;
1571 /* Delete the auto-display DISPLAY. */
1574 delete_display (struct display
*display
)
1578 gdb_assert (display
!= NULL
);
1580 if (display_chain
== display
)
1581 display_chain
= display
->next
;
1584 if (d
->next
== display
)
1586 d
->next
= display
->next
;
1590 free_display (display
);
1593 /* Call FUNCTION on each of the displays whose numbers are given in
1594 ARGS. DATA is passed unmodified to FUNCTION. */
1597 map_display_numbers (char *args
,
1598 void (*function
) (struct display
*,
1602 struct get_number_or_range_state state
;
1603 struct display
*b
, *tmp
;
1607 error_no_arg (_("one or more display numbers"));
1609 init_number_or_range (&state
, args
);
1611 while (!state
.finished
)
1613 char *p
= state
.string
;
1615 num
= get_number_or_range (&state
);
1617 warning (_("bad display number at or near '%s'"), p
);
1620 struct display
*d
, *tmp
;
1622 ALL_DISPLAYS_SAFE (d
, tmp
)
1623 if (d
->number
== num
)
1626 printf_unfiltered (_("No display number %d.\n"), num
);
1633 /* Callback for map_display_numbers, that deletes a display. */
1636 do_delete_display (struct display
*d
, void *data
)
1641 /* "undisplay" command. */
1644 undisplay_command (char *args
, int from_tty
)
1647 struct get_number_or_range_state state
;
1651 if (query (_("Delete all auto-display expressions? ")))
1657 map_display_numbers (args
, do_delete_display
, NULL
);
1661 /* Display a single auto-display.
1662 Do nothing if the display cannot be printed in the current context,
1663 or if the display is disabled. */
1666 do_one_display (struct display
*d
)
1668 struct cleanup
*old_chain
;
1669 int within_current_scope
;
1671 if (d
->enabled_p
== 0)
1674 /* The expression carries the architecture that was used at parse time.
1675 This is a problem if the expression depends on architecture features
1676 (e.g. register numbers), and the current architecture is now different.
1677 For example, a display statement like "display/i $pc" is expected to
1678 display the PC register of the current architecture, not the arch at
1679 the time the display command was given. Therefore, we re-parse the
1680 expression if the current architecture has changed. */
1681 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1690 volatile struct gdb_exception ex
;
1692 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1694 innermost_block
= NULL
;
1695 d
->exp
= parse_expression (d
->exp_string
);
1696 d
->block
= innermost_block
;
1700 /* Can't re-parse the expression. Disable this display item. */
1702 warning (_("Unable to display \"%s\": %s"),
1703 d
->exp_string
, ex
.message
);
1710 if (d
->pspace
== current_program_space
)
1711 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1713 within_current_scope
= 0;
1716 within_current_scope
= 1;
1717 if (!within_current_scope
)
1720 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1721 current_display_number
= d
->number
;
1723 annotate_display_begin ();
1724 printf_filtered ("%d", d
->number
);
1725 annotate_display_number_end ();
1726 printf_filtered (": ");
1729 volatile struct gdb_exception ex
;
1731 annotate_display_format ();
1733 printf_filtered ("x/");
1734 if (d
->format
.count
!= 1)
1735 printf_filtered ("%d", d
->format
.count
);
1736 printf_filtered ("%c", d
->format
.format
);
1737 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1738 printf_filtered ("%c", d
->format
.size
);
1739 printf_filtered (" ");
1741 annotate_display_expression ();
1743 puts_filtered (d
->exp_string
);
1744 annotate_display_expression_end ();
1746 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1747 printf_filtered ("\n");
1749 printf_filtered (" ");
1751 annotate_display_value ();
1753 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1758 val
= evaluate_expression (d
->exp
);
1759 addr
= value_as_address (val
);
1760 if (d
->format
.format
== 'i')
1761 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1762 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1765 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1769 struct value_print_options opts
;
1770 volatile struct gdb_exception ex
;
1772 annotate_display_format ();
1774 if (d
->format
.format
)
1775 printf_filtered ("/%c ", d
->format
.format
);
1777 annotate_display_expression ();
1779 puts_filtered (d
->exp_string
);
1780 annotate_display_expression_end ();
1782 printf_filtered (" = ");
1784 annotate_display_expression ();
1786 get_formatted_print_options (&opts
, d
->format
.format
);
1787 opts
.raw
= d
->format
.raw
;
1789 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1793 val
= evaluate_expression (d
->exp
);
1794 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1797 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1798 printf_filtered ("\n");
1801 annotate_display_end ();
1803 gdb_flush (gdb_stdout
);
1804 do_cleanups (old_chain
);
1807 /* Display all of the values on the auto-display chain which can be
1808 evaluated in the current scope. */
1815 for (d
= display_chain
; d
; d
= d
->next
)
1819 /* Delete the auto-display which we were in the process of displaying.
1820 This is done when there is an error or a signal. */
1823 disable_display (int num
)
1827 for (d
= display_chain
; d
; d
= d
->next
)
1828 if (d
->number
== num
)
1833 printf_unfiltered (_("No display number %d.\n"), num
);
1837 disable_current_display (void)
1839 if (current_display_number
>= 0)
1841 disable_display (current_display_number
);
1842 fprintf_unfiltered (gdb_stderr
,
1843 _("Disabling display %d to "
1844 "avoid infinite recursion.\n"),
1845 current_display_number
);
1847 current_display_number
= -1;
1851 display_info (char *ignore
, int from_tty
)
1856 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1858 printf_filtered (_("Auto-display expressions now in effect:\n\
1859 Num Enb Expression\n"));
1861 for (d
= display_chain
; d
; d
= d
->next
)
1863 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1865 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1867 else if (d
->format
.format
)
1868 printf_filtered ("/%c ", d
->format
.format
);
1869 puts_filtered (d
->exp_string
);
1870 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1871 printf_filtered (_(" (cannot be evaluated in the current context)"));
1872 printf_filtered ("\n");
1873 gdb_flush (gdb_stdout
);
1877 /* Callback fo map_display_numbers, that enables or disables the
1878 passed in display D. */
1881 do_enable_disable_display (struct display
*d
, void *data
)
1883 d
->enabled_p
= *(int *) data
;
1886 /* Implamentation of both the "disable display" and "enable display"
1887 commands. ENABLE decides what to do. */
1890 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1897 d
->enabled_p
= enable
;
1901 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1904 /* The "enable display" command. */
1907 enable_display_command (char *args
, int from_tty
)
1909 enable_disable_display_command (args
, from_tty
, 1);
1912 /* The "disable display" command. */
1915 disable_display_command (char *args
, int from_tty
)
1917 enable_disable_display_command (args
, from_tty
, 0);
1920 /* display_chain items point to blocks and expressions. Some expressions in
1921 turn may point to symbols.
1922 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1923 obstack_free'd when a shared library is unloaded.
1924 Clear pointers that are about to become dangling.
1925 Both .exp and .block fields will be restored next time we need to display
1926 an item by re-parsing .exp_string field in the new execution context. */
1929 clear_dangling_display_expressions (struct so_list
*solib
)
1931 struct objfile
*objfile
= solib
->objfile
;
1934 /* With no symbol file we cannot have a block or expression from it. */
1935 if (objfile
== NULL
)
1937 if (objfile
->separate_debug_objfile_backlink
)
1938 objfile
= objfile
->separate_debug_objfile_backlink
;
1939 gdb_assert (objfile
->pspace
== solib
->pspace
);
1941 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1943 if (d
->pspace
!= solib
->pspace
)
1946 if (lookup_objfile_from_block (d
->block
) == objfile
1947 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1957 /* Print the value in stack frame FRAME of a variable specified by a
1958 struct symbol. NAME is the name to print; if NULL then VAR's print
1959 name will be used. STREAM is the ui_file on which to print the
1960 value. INDENT specifies the number of indent levels to print
1961 before printing the variable name. */
1964 print_variable_and_value (const char *name
, struct symbol
*var
,
1965 struct frame_info
*frame
,
1966 struct ui_file
*stream
, int indent
)
1968 volatile struct gdb_exception except
;
1971 name
= SYMBOL_PRINT_NAME (var
);
1973 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1974 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1977 struct value_print_options opts
;
1979 val
= read_var_value (var
, frame
);
1980 get_user_print_options (&opts
);
1982 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1984 if (except
.reason
< 0)
1985 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
1987 fprintf_filtered (stream
, "\n");
1990 /* printf "printf format string" ARG to STREAM. */
1993 ui_printf (char *arg
, struct ui_file
*stream
)
1997 char *string
= NULL
;
1998 struct value
**val_args
;
2000 char *current_substring
;
2002 int allocated_args
= 20;
2003 struct cleanup
*old_cleanups
;
2005 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2006 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2009 error_no_arg (_("format-control string and values to print"));
2011 s
= skip_spaces (s
);
2013 /* A format string should follow, enveloped in double quotes. */
2015 error (_("Bad format string, missing '\"'."));
2017 /* Parse the format-control string and copy it into the string STRING,
2018 processing some kinds of escape sequence. */
2020 f
= string
= (char *) alloca (strlen (s
) + 1);
2028 error (_("Bad format string, non-terminated '\"'."));
2061 /* ??? TODO: handle other escape sequences. */
2062 error (_("Unrecognized escape character \\%c in format string."),
2072 /* Skip over " and following space and comma. */
2075 s
= skip_spaces (s
);
2077 if (*s
!= ',' && *s
!= 0)
2078 error (_("Invalid argument syntax"));
2082 s
= skip_spaces (s
);
2084 /* Need extra space for the '\0's. Doubling the size is sufficient. */
2085 substrings
= alloca (strlen (string
) * 2);
2086 current_substring
= substrings
;
2089 /* Now scan the string for %-specs and see what kinds of args they want.
2090 argclass[I] classifies the %-specs so we can give printf_filtered
2091 something of the right size. */
2095 int_arg
, long_arg
, long_long_arg
, ptr_arg
,
2096 string_arg
, wide_string_arg
, wide_char_arg
,
2097 double_arg
, long_double_arg
, decfloat_arg
2099 enum argclass
*argclass
;
2100 enum argclass this_argclass
;
2105 argclass
= (enum argclass
*) alloca (strlen (s
) * sizeof *argclass
);
2112 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
2113 int seen_space
= 0, seen_plus
= 0;
2114 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
2115 int seen_big_d
= 0, seen_double_big_d
= 0;
2118 /* Check the validity of the format specifier, and work
2119 out what argument it expects. We only accept C89
2120 format strings, with the exception of long long (which
2121 we autoconf for). */
2123 /* Skip over "%%". */
2130 /* The first part of a format specifier is a set of flag
2132 while (strchr ("0-+ #", *f
))
2145 /* The next part of a format specifier is a width. */
2146 while (strchr ("0123456789", *f
))
2149 /* The next part of a format specifier is a precision. */
2154 while (strchr ("0123456789", *f
))
2158 /* The next part of a format specifier is a length modifier. */
2179 /* Decimal32 modifier. */
2185 /* Decimal64 and Decimal128 modifiers. */
2190 /* Check for a Decimal128. */
2194 seen_double_big_d
= 1;
2210 if (seen_space
|| seen_plus
)
2217 this_argclass
= int_arg
;
2218 else if (lcount
== 1)
2219 this_argclass
= long_arg
;
2221 this_argclass
= long_long_arg
;
2228 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
2229 if (lcount
> 1 || seen_h
|| seen_big_l
)
2231 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2236 this_argclass
= ptr_arg
;
2237 if (lcount
|| seen_h
|| seen_big_l
)
2239 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2244 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
2245 if (lcount
> 1 || seen_h
|| seen_big_l
)
2247 if (seen_zero
|| seen_space
|| seen_plus
)
2256 if (seen_big_h
|| seen_big_d
|| seen_double_big_d
)
2257 this_argclass
= decfloat_arg
;
2258 else if (seen_big_l
)
2259 this_argclass
= long_double_arg
;
2261 this_argclass
= double_arg
;
2263 if (lcount
|| seen_h
)
2268 error (_("`*' not supported for precision or width in printf"));
2271 error (_("Format specifier `n' not supported in printf"));
2274 error (_("Incomplete format specifier at end of format string"));
2277 error (_("Unrecognized format specifier '%c' in printf"), *f
);
2281 error (_("Inappropriate modifiers to "
2282 "format specifier '%c' in printf"),
2287 if (lcount
> 1 && USE_PRINTF_I64
)
2289 /* Windows' printf does support long long, but not the usual way.
2290 Convert %lld to %I64d. */
2291 int length_before_ll
= f
- last_arg
- 1 - lcount
;
2293 strncpy (current_substring
, last_arg
, length_before_ll
);
2294 strcpy (current_substring
+ length_before_ll
, "I64");
2295 current_substring
[length_before_ll
+ 3] =
2296 last_arg
[length_before_ll
+ lcount
];
2297 current_substring
+= length_before_ll
+ 4;
2299 else if (this_argclass
== wide_string_arg
2300 || this_argclass
== wide_char_arg
)
2302 /* Convert %ls or %lc to %s. */
2303 int length_before_ls
= f
- last_arg
- 2;
2305 strncpy (current_substring
, last_arg
, length_before_ls
);
2306 strcpy (current_substring
+ length_before_ls
, "s");
2307 current_substring
+= length_before_ls
+ 2;
2311 strncpy (current_substring
, last_arg
, f
- last_arg
);
2312 current_substring
+= f
- last_arg
;
2314 *current_substring
++ = '\0';
2316 argclass
[nargs_wanted
++] = this_argclass
;
2319 /* Now, parse all arguments and evaluate them.
2320 Store the VALUEs in VAL_ARGS. */
2326 if (nargs
== allocated_args
)
2327 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2328 (allocated_args
*= 2)
2329 * sizeof (struct value
*));
2331 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2339 if (nargs
!= nargs_wanted
)
2340 error (_("Wrong number of arguments for specified format-string"));
2342 /* Now actually print them. */
2343 current_substring
= substrings
;
2344 for (i
= 0; i
< nargs
; i
++)
2346 switch (argclass
[i
])
2354 tem
= value_as_address (val_args
[i
]);
2356 /* This is a %s argument. Find the length of the string. */
2362 read_memory (tem
+ j
, &c
, 1);
2367 /* Copy the string contents into a string inside GDB. */
2368 str
= (gdb_byte
*) alloca (j
+ 1);
2370 read_memory (tem
, str
, j
);
2373 fprintf_filtered (stream
, current_substring
, (char *) str
);
2376 case wide_string_arg
:
2381 struct gdbarch
*gdbarch
2382 = get_type_arch (value_type (val_args
[i
]));
2383 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2384 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2385 "wchar_t", NULL
, 0);
2386 int wcwidth
= TYPE_LENGTH (wctype
);
2387 gdb_byte
*buf
= alloca (wcwidth
);
2388 struct obstack output
;
2389 struct cleanup
*inner_cleanup
;
2391 tem
= value_as_address (val_args
[i
]);
2393 /* This is a %s argument. Find the length of the string. */
2394 for (j
= 0;; j
+= wcwidth
)
2397 read_memory (tem
+ j
, buf
, wcwidth
);
2398 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2402 /* Copy the string contents into a string inside GDB. */
2403 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2405 read_memory (tem
, str
, j
);
2406 memset (&str
[j
], 0, wcwidth
);
2408 obstack_init (&output
);
2409 inner_cleanup
= make_cleanup_obstack_free (&output
);
2411 convert_between_encodings (target_wide_charset (gdbarch
),
2414 &output
, translit_char
);
2415 obstack_grow_str0 (&output
, "");
2417 fprintf_filtered (stream
, current_substring
,
2418 obstack_base (&output
));
2419 do_cleanups (inner_cleanup
);
2424 struct gdbarch
*gdbarch
2425 = get_type_arch (value_type (val_args
[i
]));
2426 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2427 "wchar_t", NULL
, 0);
2428 struct type
*valtype
;
2429 struct obstack output
;
2430 struct cleanup
*inner_cleanup
;
2431 const gdb_byte
*bytes
;
2433 valtype
= value_type (val_args
[i
]);
2434 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2435 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2436 error (_("expected wchar_t argument for %%lc"));
2438 bytes
= value_contents (val_args
[i
]);
2440 obstack_init (&output
);
2441 inner_cleanup
= make_cleanup_obstack_free (&output
);
2443 convert_between_encodings (target_wide_charset (gdbarch
),
2445 bytes
, TYPE_LENGTH (valtype
),
2446 TYPE_LENGTH (valtype
),
2447 &output
, translit_char
);
2448 obstack_grow_str0 (&output
, "");
2450 fprintf_filtered (stream
, current_substring
,
2451 obstack_base (&output
));
2452 do_cleanups (inner_cleanup
);
2457 struct type
*type
= value_type (val_args
[i
]);
2461 /* If format string wants a float, unchecked-convert the value
2462 to floating point of the same size. */
2463 type
= float_type_from_length (type
);
2464 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2466 error (_("Invalid floating value found in program."));
2468 fprintf_filtered (stream
, current_substring
, (double) val
);
2471 case long_double_arg
:
2472 #ifdef HAVE_LONG_DOUBLE
2474 struct type
*type
= value_type (val_args
[i
]);
2478 /* If format string wants a float, unchecked-convert the value
2479 to floating point of the same size. */
2480 type
= float_type_from_length (type
);
2481 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2483 error (_("Invalid floating value found in program."));
2485 fprintf_filtered (stream
, current_substring
,
2490 error (_("long double not supported in printf"));
2493 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2495 long long val
= value_as_long (val_args
[i
]);
2497 fprintf_filtered (stream
, current_substring
, val
);
2501 error (_("long long not supported in printf"));
2505 int val
= value_as_long (val_args
[i
]);
2507 fprintf_filtered (stream
, current_substring
, val
);
2512 long val
= value_as_long (val_args
[i
]);
2514 fprintf_filtered (stream
, current_substring
, val
);
2518 /* Handles decimal floating values. */
2521 const gdb_byte
*param_ptr
= value_contents (val_args
[i
]);
2523 #if defined (PRINTF_HAS_DECFLOAT)
2524 /* If we have native support for Decimal floating
2525 printing, handle it here. */
2526 fprintf_filtered (stream
, current_substring
, param_ptr
);
2529 /* As a workaround until vasprintf has native support for DFP
2530 we convert the DFP values to string and print them using
2531 the %s format specifier. */
2534 int nnull_chars
= 0;
2536 /* Parameter data. */
2537 struct type
*param_type
= value_type (val_args
[i
]);
2538 unsigned int param_len
= TYPE_LENGTH (param_type
);
2539 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2540 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2542 /* DFP output data. */
2543 struct value
*dfp_value
= NULL
;
2547 struct type
*dfp_type
= NULL
;
2548 char decstr
[MAX_DECIMAL_STRING
];
2550 /* Points to the end of the string so that we can go back
2551 and check for DFP length modifiers. */
2552 eos
= current_substring
+ strlen (current_substring
);
2554 /* Look for the float/double format specifier. */
2555 while (*eos
!= 'f' && *eos
!= 'e' && *eos
!= 'E'
2556 && *eos
!= 'g' && *eos
!= 'G')
2561 /* Search for the '%' char and extract the size and type of
2562 the output decimal value based on its modifiers
2563 (%Hf, %Df, %DDf). */
2564 while (*--sos
!= '%')
2569 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2571 else if (*sos
== 'D' && *(sos
- 1) == 'D')
2574 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2580 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2584 /* Replace %Hf, %Df and %DDf with %s's. */
2587 /* Go through the whole format string and pull the correct
2588 number of chars back to compensate for the change in the
2589 format specifier. */
2590 while (nnull_chars
< nargs
- i
)
2598 /* Conversion between different DFP types. */
2599 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2600 decimal_convert (param_ptr
, param_len
, byte_order
,
2601 dec
, dfp_len
, byte_order
);
2603 /* If this is a non-trivial conversion, just output 0.
2604 A correct converted value can be displayed by explicitly
2605 casting to a DFP type. */
2606 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2608 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2610 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2612 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2614 /* Print the DFP value. */
2615 fprintf_filtered (stream
, current_substring
, decstr
);
2623 /* We avoid the host's %p because pointers are too
2624 likely to be the wrong size. The only interesting
2625 modifier for %p is a width; extract that, and then
2626 handle %p as glibc would: %#x or a literal "(nil)". */
2628 char *p
, *fmt
, *fmt_p
;
2629 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2630 long long val
= value_as_long (val_args
[i
]);
2632 long val
= value_as_long (val_args
[i
]);
2635 fmt
= alloca (strlen (current_substring
) + 5);
2637 /* Copy up to the leading %. */
2638 p
= current_substring
;
2642 int is_percent
= (*p
== '%');
2657 /* Copy any width. */
2658 while (*p
>= '0' && *p
< '9')
2661 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2664 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2670 fprintf_filtered (stream
, fmt
, val
);
2676 fprintf_filtered (stream
, fmt
, "(nil)");
2682 internal_error (__FILE__
, __LINE__
,
2683 _("failed internal consistency check"));
2685 /* Skip to the next substring. */
2686 current_substring
+= strlen (current_substring
) + 1;
2688 /* Print the portion of the format string after the last argument.
2689 Note that this will not include any ordinary %-specs, but it
2690 might include "%%". That is why we use printf_filtered and not
2691 puts_filtered here. Also, we pass a dummy argument because
2692 some platforms have modified GCC to include -Wformat-security
2693 by default, which will warn here if there is no argument. */
2694 fprintf_filtered (stream
, last_arg
, 0);
2696 do_cleanups (old_cleanups
);
2699 /* Implement the "printf" command. */
2702 printf_command (char *arg
, int from_tty
)
2704 ui_printf (arg
, gdb_stdout
);
2707 /* Implement the "eval" command. */
2710 eval_command (char *arg
, int from_tty
)
2712 struct ui_file
*ui_out
= mem_fileopen ();
2713 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2716 ui_printf (arg
, ui_out
);
2718 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2719 make_cleanup (xfree
, expanded
);
2721 execute_command (expanded
, from_tty
);
2723 do_cleanups (cleanups
);
2727 _initialize_printcmd (void)
2729 struct cmd_list_element
*c
;
2731 current_display_number
= -1;
2733 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2735 add_info ("address", address_info
,
2736 _("Describe where symbol SYM is stored."));
2738 add_info ("symbol", sym_info
, _("\
2739 Describe what symbol is at location ADDR.\n\
2740 Only for symbols with fixed locations (global or static scope)."));
2742 add_com ("x", class_vars
, x_command
, _("\
2743 Examine memory: x/FMT ADDRESS.\n\
2744 ADDRESS is an expression for the memory address to examine.\n\
2745 FMT is a repeat count followed by a format letter and a size letter.\n\
2746 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2747 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2748 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2749 The specified number of objects of the specified size are printed\n\
2750 according to the format.\n\n\
2751 Defaults for format and size letters are those previously used.\n\
2752 Default count is 1. Default address is following last thing printed\n\
2753 with this command or \"print\"."));
2756 add_com ("whereis", class_vars
, whereis_command
,
2757 _("Print line number and file of definition of variable."));
2760 add_info ("display", display_info
, _("\
2761 Expressions to display when program stops, with code numbers."));
2763 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2764 Cancel some expressions to be displayed when program stops.\n\
2765 Arguments are the code numbers of the expressions to stop displaying.\n\
2766 No argument means cancel all automatic-display expressions.\n\
2767 \"delete display\" has the same effect as this command.\n\
2768 Do \"info display\" to see current list of code numbers."),
2771 add_com ("display", class_vars
, display_command
, _("\
2772 Print value of expression EXP each time the program stops.\n\
2773 /FMT may be used before EXP as in the \"print\" command.\n\
2774 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2775 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2776 and examining is done as in the \"x\" command.\n\n\
2777 With no argument, display all currently requested auto-display expressions.\n\
2778 Use \"undisplay\" to cancel display requests previously made."));
2780 add_cmd ("display", class_vars
, enable_display_command
, _("\
2781 Enable some expressions to be displayed when program stops.\n\
2782 Arguments are the code numbers of the expressions to resume displaying.\n\
2783 No argument means enable all automatic-display expressions.\n\
2784 Do \"info display\" to see current list of code numbers."), &enablelist
);
2786 add_cmd ("display", class_vars
, disable_display_command
, _("\
2787 Disable some expressions to be displayed when program stops.\n\
2788 Arguments are the code numbers of the expressions to stop displaying.\n\
2789 No argument means disable all automatic-display expressions.\n\
2790 Do \"info display\" to see current list of code numbers."), &disablelist
);
2792 add_cmd ("display", class_vars
, undisplay_command
, _("\
2793 Cancel some expressions to be displayed when program stops.\n\
2794 Arguments are the code numbers of the expressions to stop displaying.\n\
2795 No argument means cancel all automatic-display expressions.\n\
2796 Do \"info display\" to see current list of code numbers."), &deletelist
);
2798 add_com ("printf", class_vars
, printf_command
, _("\
2799 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2800 This is useful for formatted output in user-defined commands."));
2802 add_com ("output", class_vars
, output_command
, _("\
2803 Like \"print\" but don't put in value history and don't print newline.\n\
2804 This is useful in user-defined commands."));
2806 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2807 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2808 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2809 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2810 with $), a register (a few standard names starting with $), or an actual\n\
2811 variable in the program being debugged. EXP is any valid expression.\n\
2812 Use \"set variable\" for variables with names identical to set subcommands.\n\
2814 With a subcommand, this command modifies parts of the gdb environment.\n\
2815 You can see these environment settings with the \"show\" command."),
2816 &setlist
, "set ", 1, &cmdlist
);
2818 add_com ("assign", class_vars
, set_command
, _("\
2819 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2820 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2821 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2822 with $), a register (a few standard names starting with $), or an actual\n\
2823 variable in the program being debugged. EXP is any valid expression.\n\
2824 Use \"set variable\" for variables with names identical to set subcommands.\n\
2825 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2826 You can see these environment settings with the \"show\" command."));
2828 /* "call" is the same as "set", but handy for dbx users to call fns. */
2829 c
= add_com ("call", class_vars
, call_command
, _("\
2830 Call a function in the program.\n\
2831 The argument is the function name and arguments, in the notation of the\n\
2832 current working language. The result is printed and saved in the value\n\
2833 history, if it is not void."));
2834 set_cmd_completer (c
, expression_completer
);
2836 add_cmd ("variable", class_vars
, set_command
, _("\
2837 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2838 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2839 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2840 with $), a register (a few standard names starting with $), or an actual\n\
2841 variable in the program being debugged. EXP is any valid expression.\n\
2842 This may usually be abbreviated to simply \"set\"."),
2845 c
= add_com ("print", class_vars
, print_command
, _("\
2846 Print value of expression EXP.\n\
2847 Variables accessible are those of the lexical environment of the selected\n\
2848 stack frame, plus all those whose scope is global or an entire file.\n\
2850 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2851 $$NUM refers to NUM'th value back from the last one.\n\
2852 Names starting with $ refer to registers (with the values they would have\n\
2853 if the program were to return to the stack frame now selected, restoring\n\
2854 all registers saved by frames farther in) or else to debugger\n\
2855 \"convenience\" variables (any such name not a known register).\n\
2856 Use assignment expressions to give values to convenience variables.\n\
2858 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2859 @ is a binary operator for treating consecutive data objects\n\
2860 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2861 element is FOO, whose second element is stored in the space following\n\
2862 where FOO is stored, etc. FOO must be an expression whose value\n\
2863 resides in memory.\n\
2865 EXP may be preceded with /FMT, where FMT is a format letter\n\
2866 but no count or size letter (see \"x\" command)."));
2867 set_cmd_completer (c
, expression_completer
);
2868 add_com_alias ("p", "print", class_vars
, 1);
2870 c
= add_com ("inspect", class_vars
, inspect_command
, _("\
2871 Same as \"print\" command, except that if you are running in the epoch\n\
2872 environment, the value is printed in its own window."));
2873 set_cmd_completer (c
, expression_completer
);
2875 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2876 &max_symbolic_offset
, _("\
2877 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2878 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2880 show_max_symbolic_offset
,
2881 &setprintlist
, &showprintlist
);
2882 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2883 &print_symbol_filename
, _("\
2884 Set printing of source filename and line number with <symbol>."), _("\
2885 Show printing of source filename and line number with <symbol>."), NULL
,
2887 show_print_symbol_filename
,
2888 &setprintlist
, &showprintlist
);
2890 add_com ("eval", no_class
, eval_command
, _("\
2891 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2892 a command line, and call it."));