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 switch (expr
->elts
[0].opcode
)
1086 case UNOP_PREINCREMENT
:
1087 case UNOP_POSTINCREMENT
:
1088 case UNOP_PREDECREMENT
:
1089 case UNOP_POSTDECREMENT
:
1091 case BINOP_ASSIGN_MODIFY
:
1096 (_("Expression is not an assignment (and might have no effect)"));
1099 evaluate_expression (expr
);
1100 do_cleanups (old_chain
);
1104 sym_info (char *arg
, int from_tty
)
1106 struct minimal_symbol
*msymbol
;
1107 struct objfile
*objfile
;
1108 struct obj_section
*osect
;
1109 CORE_ADDR addr
, sect_addr
;
1111 unsigned int offset
;
1114 error_no_arg (_("address"));
1116 addr
= parse_and_eval_address (arg
);
1117 ALL_OBJSECTIONS (objfile
, osect
)
1119 /* Only process each object file once, even if there's a separate
1121 if (objfile
->separate_debug_objfile_backlink
)
1124 sect_addr
= overlay_mapped_address (addr
, osect
);
1126 if (obj_section_addr (osect
) <= sect_addr
1127 && sect_addr
< obj_section_endaddr (osect
)
1128 && (msymbol
= lookup_minimal_symbol_by_pc_section (sect_addr
, osect
)))
1130 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1132 struct cleanup
*old_chain
;
1135 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1136 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1137 sec_name
= osect
->the_bfd_section
->name
;
1138 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1140 /* Don't print the offset if it is zero.
1141 We assume there's no need to handle i18n of "sym + offset". */
1143 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1145 loc_string
= xstrprintf ("%s", msym_name
);
1147 /* Use a cleanup to free loc_string in case the user quits
1148 a pagination request inside printf_filtered. */
1149 old_chain
= make_cleanup (xfree
, loc_string
);
1151 gdb_assert (osect
->objfile
&& osect
->objfile
->name
);
1152 obj_name
= osect
->objfile
->name
;
1154 if (MULTI_OBJFILE_P ())
1155 if (pc_in_unmapped_range (addr
, osect
))
1156 if (section_is_overlay (osect
))
1157 printf_filtered (_("%s in load address range of "
1158 "%s overlay section %s of %s\n"),
1159 loc_string
, mapped
, sec_name
, obj_name
);
1161 printf_filtered (_("%s in load address range of "
1162 "section %s of %s\n"),
1163 loc_string
, sec_name
, obj_name
);
1165 if (section_is_overlay (osect
))
1166 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1167 loc_string
, mapped
, sec_name
, obj_name
);
1169 printf_filtered (_("%s in section %s of %s\n"),
1170 loc_string
, sec_name
, obj_name
);
1172 if (pc_in_unmapped_range (addr
, osect
))
1173 if (section_is_overlay (osect
))
1174 printf_filtered (_("%s in load address range of %s overlay "
1176 loc_string
, mapped
, sec_name
);
1178 printf_filtered (_("%s in load address range of section %s\n"),
1179 loc_string
, sec_name
);
1181 if (section_is_overlay (osect
))
1182 printf_filtered (_("%s in %s overlay section %s\n"),
1183 loc_string
, mapped
, sec_name
);
1185 printf_filtered (_("%s in section %s\n"),
1186 loc_string
, sec_name
);
1188 do_cleanups (old_chain
);
1192 printf_filtered (_("No symbol matches %s.\n"), arg
);
1196 address_info (char *exp
, int from_tty
)
1198 struct gdbarch
*gdbarch
;
1201 struct minimal_symbol
*msymbol
;
1203 struct obj_section
*section
;
1204 CORE_ADDR load_addr
, context_pc
= 0;
1205 int is_a_field_of_this
; /* C++: lookup_symbol sets this to nonzero
1206 if exp is a field of `this'. */
1209 error (_("Argument required."));
1211 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1212 &is_a_field_of_this
);
1215 if (is_a_field_of_this
)
1217 printf_filtered ("Symbol \"");
1218 fprintf_symbol_filtered (gdb_stdout
, exp
,
1219 current_language
->la_language
, DMGL_ANSI
);
1220 printf_filtered ("\" is a field of the local class variable ");
1221 if (current_language
->la_language
== language_objc
)
1222 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1224 printf_filtered ("`this'\n");
1228 msymbol
= lookup_minimal_symbol (exp
, NULL
, NULL
);
1230 if (msymbol
!= NULL
)
1232 gdbarch
= get_objfile_arch (msymbol_objfile (msymbol
));
1233 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1235 printf_filtered ("Symbol \"");
1236 fprintf_symbol_filtered (gdb_stdout
, exp
,
1237 current_language
->la_language
, DMGL_ANSI
);
1238 printf_filtered ("\" is at ");
1239 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1240 printf_filtered (" in a file compiled without debugging");
1241 section
= SYMBOL_OBJ_SECTION (msymbol
);
1242 if (section_is_overlay (section
))
1244 load_addr
= overlay_unmapped_address (load_addr
, section
);
1245 printf_filtered (",\n -- loaded at ");
1246 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1247 printf_filtered (" in overlay section %s",
1248 section
->the_bfd_section
->name
);
1250 printf_filtered (".\n");
1253 error (_("No symbol \"%s\" in current context."), exp
);
1257 printf_filtered ("Symbol \"");
1258 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1259 current_language
->la_language
, DMGL_ANSI
);
1260 printf_filtered ("\" is ");
1261 val
= SYMBOL_VALUE (sym
);
1262 section
= SYMBOL_OBJ_SECTION (sym
);
1263 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1265 switch (SYMBOL_CLASS (sym
))
1268 case LOC_CONST_BYTES
:
1269 printf_filtered ("constant");
1273 printf_filtered ("a label at address ");
1274 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1275 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1276 if (section_is_overlay (section
))
1278 load_addr
= overlay_unmapped_address (load_addr
, section
);
1279 printf_filtered (",\n -- loaded at ");
1280 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1281 printf_filtered (" in overlay section %s",
1282 section
->the_bfd_section
->name
);
1287 /* FIXME: cagney/2004-01-26: It should be possible to
1288 unconditionally call the SYMBOL_COMPUTED_OPS method when available.
1289 Unfortunately DWARF 2 stores the frame-base (instead of the
1290 function) location in a function's symbol. Oops! For the
1291 moment enable this when/where applicable. */
1292 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1297 /* GDBARCH is the architecture associated with the objfile the symbol
1298 is defined in; the target architecture may be different, and may
1299 provide additional registers. However, we do not know the target
1300 architecture at this point. We assume the objfile architecture
1301 will contain all the standard registers that occur in debug info
1303 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1305 if (SYMBOL_IS_ARGUMENT (sym
))
1306 printf_filtered (_("an argument in register %s"),
1307 gdbarch_register_name (gdbarch
, regno
));
1309 printf_filtered (_("a variable in register %s"),
1310 gdbarch_register_name (gdbarch
, regno
));
1314 printf_filtered (_("static storage at address "));
1315 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1316 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1317 if (section_is_overlay (section
))
1319 load_addr
= overlay_unmapped_address (load_addr
, section
);
1320 printf_filtered (_(",\n -- loaded at "));
1321 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1322 printf_filtered (_(" in overlay section %s"),
1323 section
->the_bfd_section
->name
);
1327 case LOC_REGPARM_ADDR
:
1328 /* Note comment at LOC_REGISTER. */
1329 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1330 printf_filtered (_("address of an argument in register %s"),
1331 gdbarch_register_name (gdbarch
, regno
));
1335 printf_filtered (_("an argument at offset %ld"), val
);
1339 printf_filtered (_("a local variable at frame offset %ld"), val
);
1343 printf_filtered (_("a reference argument at offset %ld"), val
);
1347 printf_filtered (_("a typedef"));
1351 printf_filtered (_("a function at address "));
1352 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1353 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1354 if (section_is_overlay (section
))
1356 load_addr
= overlay_unmapped_address (load_addr
, section
);
1357 printf_filtered (_(",\n -- loaded at "));
1358 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1359 printf_filtered (_(" in overlay section %s"),
1360 section
->the_bfd_section
->name
);
1364 case LOC_UNRESOLVED
:
1366 struct minimal_symbol
*msym
;
1368 msym
= lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (sym
), NULL
, NULL
);
1370 printf_filtered ("unresolved");
1373 section
= SYMBOL_OBJ_SECTION (msym
);
1374 load_addr
= SYMBOL_VALUE_ADDRESS (msym
);
1377 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1378 printf_filtered (_("a thread-local variable at offset %s "
1379 "in the thread-local storage for `%s'"),
1380 paddress (gdbarch
, load_addr
),
1381 section
->objfile
->name
);
1384 printf_filtered (_("static storage at address "));
1385 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1386 if (section_is_overlay (section
))
1388 load_addr
= overlay_unmapped_address (load_addr
, section
);
1389 printf_filtered (_(",\n -- loaded at "));
1390 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1391 printf_filtered (_(" in overlay section %s"),
1392 section
->the_bfd_section
->name
);
1399 case LOC_OPTIMIZED_OUT
:
1400 printf_filtered (_("optimized out"));
1404 printf_filtered (_("of unknown (botched) type"));
1407 printf_filtered (".\n");
1412 x_command (char *exp
, int from_tty
)
1414 struct expression
*expr
;
1415 struct format_data fmt
;
1416 struct cleanup
*old_chain
;
1419 fmt
.format
= last_format
? last_format
: 'x';
1420 fmt
.size
= last_size
;
1424 if (exp
&& *exp
== '/')
1427 fmt
= decode_format (&exp
, last_format
, last_size
);
1430 /* If we have an expression, evaluate it and use it as the address. */
1432 if (exp
!= 0 && *exp
!= 0)
1434 expr
= parse_expression (exp
);
1435 /* Cause expression not to be there any more if this command is
1436 repeated with Newline. But don't clobber a user-defined
1437 command's definition. */
1440 old_chain
= make_cleanup (free_current_contents
, &expr
);
1441 val
= evaluate_expression (expr
);
1442 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1443 val
= coerce_ref (val
);
1444 /* In rvalue contexts, such as this, functions are coerced into
1445 pointers to functions. This makes "x/i main" work. */
1446 if (/* last_format == 'i' && */
1447 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1448 && VALUE_LVAL (val
) == lval_memory
)
1449 next_address
= value_address (val
);
1451 next_address
= value_as_address (val
);
1453 next_gdbarch
= expr
->gdbarch
;
1454 do_cleanups (old_chain
);
1458 error_no_arg (_("starting display address"));
1460 do_examine (fmt
, next_gdbarch
, next_address
);
1462 /* If the examine succeeds, we remember its size and format for next
1463 time. Set last_size to 'b' for strings. */
1464 if (fmt
.format
== 's')
1467 last_size
= fmt
.size
;
1468 last_format
= fmt
.format
;
1470 /* Set a couple of internal variables if appropriate. */
1471 if (last_examine_value
)
1473 /* Make last address examined available to the user as $_. Use
1474 the correct pointer type. */
1475 struct type
*pointer_type
1476 = lookup_pointer_type (value_type (last_examine_value
));
1477 set_internalvar (lookup_internalvar ("_"),
1478 value_from_pointer (pointer_type
,
1479 last_examine_address
));
1481 /* Make contents of last address examined available to the user
1482 as $__. If the last value has not been fetched from memory
1483 then don't fetch it now; instead mark it by voiding the $__
1485 if (value_lazy (last_examine_value
))
1486 clear_internalvar (lookup_internalvar ("__"));
1488 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1493 /* Add an expression to the auto-display chain.
1494 Specify the expression. */
1497 display_command (char *exp
, int from_tty
)
1499 struct format_data fmt
;
1500 struct expression
*expr
;
1501 struct display
*new;
1505 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1507 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1508 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1522 fmt
= decode_format (&exp
, 0, 0);
1523 if (fmt
.size
&& fmt
.format
== 0)
1525 if (fmt
.format
== 'i' || fmt
.format
== 's')
1536 innermost_block
= NULL
;
1537 expr
= parse_expression (exp
);
1539 new = (struct display
*) xmalloc (sizeof (struct display
));
1541 new->exp_string
= xstrdup (exp
);
1543 new->block
= innermost_block
;
1544 new->pspace
= current_program_space
;
1545 new->next
= display_chain
;
1546 new->number
= ++display_number
;
1549 display_chain
= new;
1551 if (from_tty
&& target_has_execution
)
1552 do_one_display (new);
1559 free_display (struct display
*d
)
1561 xfree (d
->exp_string
);
1566 /* Clear out the display_chain. Done when new symtabs are loaded,
1567 since this invalidates the types stored in many expressions. */
1570 clear_displays (void)
1574 while ((d
= display_chain
) != NULL
)
1576 display_chain
= d
->next
;
1581 /* Delete the auto-display DISPLAY. */
1584 delete_display (struct display
*display
)
1588 gdb_assert (display
!= NULL
);
1590 if (display_chain
== display
)
1591 display_chain
= display
->next
;
1594 if (d
->next
== display
)
1596 d
->next
= display
->next
;
1600 free_display (display
);
1603 /* Call FUNCTION on each of the displays whose numbers are given in
1604 ARGS. DATA is passed unmodified to FUNCTION. */
1607 map_display_numbers (char *args
,
1608 void (*function
) (struct display
*,
1612 struct get_number_or_range_state state
;
1613 struct display
*b
, *tmp
;
1617 error_no_arg (_("one or more display numbers"));
1619 init_number_or_range (&state
, args
);
1621 while (!state
.finished
)
1623 char *p
= state
.string
;
1625 num
= get_number_or_range (&state
);
1627 warning (_("bad display number at or near '%s'"), p
);
1630 struct display
*d
, *tmp
;
1632 ALL_DISPLAYS_SAFE (d
, tmp
)
1633 if (d
->number
== num
)
1636 printf_unfiltered (_("No display number %d.\n"), num
);
1643 /* Callback for map_display_numbers, that deletes a display. */
1646 do_delete_display (struct display
*d
, void *data
)
1651 /* "undisplay" command. */
1654 undisplay_command (char *args
, int from_tty
)
1657 struct get_number_or_range_state state
;
1661 if (query (_("Delete all auto-display expressions? ")))
1667 map_display_numbers (args
, do_delete_display
, NULL
);
1671 /* Display a single auto-display.
1672 Do nothing if the display cannot be printed in the current context,
1673 or if the display is disabled. */
1676 do_one_display (struct display
*d
)
1678 struct cleanup
*old_chain
;
1679 int within_current_scope
;
1681 if (d
->enabled_p
== 0)
1684 /* The expression carries the architecture that was used at parse time.
1685 This is a problem if the expression depends on architecture features
1686 (e.g. register numbers), and the current architecture is now different.
1687 For example, a display statement like "display/i $pc" is expected to
1688 display the PC register of the current architecture, not the arch at
1689 the time the display command was given. Therefore, we re-parse the
1690 expression if the current architecture has changed. */
1691 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1700 volatile struct gdb_exception ex
;
1702 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1704 innermost_block
= NULL
;
1705 d
->exp
= parse_expression (d
->exp_string
);
1706 d
->block
= innermost_block
;
1710 /* Can't re-parse the expression. Disable this display item. */
1712 warning (_("Unable to display \"%s\": %s"),
1713 d
->exp_string
, ex
.message
);
1720 if (d
->pspace
== current_program_space
)
1721 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1723 within_current_scope
= 0;
1726 within_current_scope
= 1;
1727 if (!within_current_scope
)
1730 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1731 current_display_number
= d
->number
;
1733 annotate_display_begin ();
1734 printf_filtered ("%d", d
->number
);
1735 annotate_display_number_end ();
1736 printf_filtered (": ");
1739 volatile struct gdb_exception ex
;
1741 annotate_display_format ();
1743 printf_filtered ("x/");
1744 if (d
->format
.count
!= 1)
1745 printf_filtered ("%d", d
->format
.count
);
1746 printf_filtered ("%c", d
->format
.format
);
1747 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1748 printf_filtered ("%c", d
->format
.size
);
1749 printf_filtered (" ");
1751 annotate_display_expression ();
1753 puts_filtered (d
->exp_string
);
1754 annotate_display_expression_end ();
1756 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1757 printf_filtered ("\n");
1759 printf_filtered (" ");
1761 annotate_display_value ();
1763 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1768 val
= evaluate_expression (d
->exp
);
1769 addr
= value_as_address (val
);
1770 if (d
->format
.format
== 'i')
1771 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1772 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1775 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1779 struct value_print_options opts
;
1780 volatile struct gdb_exception ex
;
1782 annotate_display_format ();
1784 if (d
->format
.format
)
1785 printf_filtered ("/%c ", d
->format
.format
);
1787 annotate_display_expression ();
1789 puts_filtered (d
->exp_string
);
1790 annotate_display_expression_end ();
1792 printf_filtered (" = ");
1794 annotate_display_expression ();
1796 get_formatted_print_options (&opts
, d
->format
.format
);
1797 opts
.raw
= d
->format
.raw
;
1799 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1803 val
= evaluate_expression (d
->exp
);
1804 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1807 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1808 printf_filtered ("\n");
1811 annotate_display_end ();
1813 gdb_flush (gdb_stdout
);
1814 do_cleanups (old_chain
);
1817 /* Display all of the values on the auto-display chain which can be
1818 evaluated in the current scope. */
1825 for (d
= display_chain
; d
; d
= d
->next
)
1829 /* Delete the auto-display which we were in the process of displaying.
1830 This is done when there is an error or a signal. */
1833 disable_display (int num
)
1837 for (d
= display_chain
; d
; d
= d
->next
)
1838 if (d
->number
== num
)
1843 printf_unfiltered (_("No display number %d.\n"), num
);
1847 disable_current_display (void)
1849 if (current_display_number
>= 0)
1851 disable_display (current_display_number
);
1852 fprintf_unfiltered (gdb_stderr
,
1853 _("Disabling display %d to "
1854 "avoid infinite recursion.\n"),
1855 current_display_number
);
1857 current_display_number
= -1;
1861 display_info (char *ignore
, int from_tty
)
1866 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1868 printf_filtered (_("Auto-display expressions now in effect:\n\
1869 Num Enb Expression\n"));
1871 for (d
= display_chain
; d
; d
= d
->next
)
1873 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1875 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1877 else if (d
->format
.format
)
1878 printf_filtered ("/%c ", d
->format
.format
);
1879 puts_filtered (d
->exp_string
);
1880 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1881 printf_filtered (_(" (cannot be evaluated in the current context)"));
1882 printf_filtered ("\n");
1883 gdb_flush (gdb_stdout
);
1887 /* Callback fo map_display_numbers, that enables or disables the
1888 passed in display D. */
1891 do_enable_disable_display (struct display
*d
, void *data
)
1893 d
->enabled_p
= *(int *) data
;
1896 /* Implamentation of both the "disable display" and "enable display"
1897 commands. ENABLE decides what to do. */
1900 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1907 d
->enabled_p
= enable
;
1911 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1914 /* The "enable display" command. */
1917 enable_display_command (char *args
, int from_tty
)
1919 enable_disable_display_command (args
, from_tty
, 1);
1922 /* The "disable display" command. */
1925 disable_display_command (char *args
, int from_tty
)
1927 enable_disable_display_command (args
, from_tty
, 0);
1930 /* display_chain items point to blocks and expressions. Some expressions in
1931 turn may point to symbols.
1932 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1933 obstack_free'd when a shared library is unloaded.
1934 Clear pointers that are about to become dangling.
1935 Both .exp and .block fields will be restored next time we need to display
1936 an item by re-parsing .exp_string field in the new execution context. */
1939 clear_dangling_display_expressions (struct so_list
*solib
)
1941 struct objfile
*objfile
= solib
->objfile
;
1944 /* With no symbol file we cannot have a block or expression from it. */
1945 if (objfile
== NULL
)
1947 if (objfile
->separate_debug_objfile_backlink
)
1948 objfile
= objfile
->separate_debug_objfile_backlink
;
1949 gdb_assert (objfile
->pspace
== solib
->pspace
);
1951 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1953 if (d
->pspace
!= solib
->pspace
)
1956 if (lookup_objfile_from_block (d
->block
) == objfile
1957 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1967 /* Print the value in stack frame FRAME of a variable specified by a
1968 struct symbol. NAME is the name to print; if NULL then VAR's print
1969 name will be used. STREAM is the ui_file on which to print the
1970 value. INDENT specifies the number of indent levels to print
1971 before printing the variable name. */
1974 print_variable_and_value (const char *name
, struct symbol
*var
,
1975 struct frame_info
*frame
,
1976 struct ui_file
*stream
, int indent
)
1978 volatile struct gdb_exception except
;
1981 name
= SYMBOL_PRINT_NAME (var
);
1983 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1984 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1987 struct value_print_options opts
;
1989 val
= read_var_value (var
, frame
);
1990 get_user_print_options (&opts
);
1992 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1994 if (except
.reason
< 0)
1995 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
1997 fprintf_filtered (stream
, "\n");
2000 /* printf "printf format string" ARG to STREAM. */
2003 ui_printf (char *arg
, struct ui_file
*stream
)
2007 char *string
= NULL
;
2008 struct value
**val_args
;
2010 char *current_substring
;
2012 int allocated_args
= 20;
2013 struct cleanup
*old_cleanups
;
2015 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2016 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2019 error_no_arg (_("format-control string and values to print"));
2021 s
= skip_spaces (s
);
2023 /* A format string should follow, enveloped in double quotes. */
2025 error (_("Bad format string, missing '\"'."));
2027 /* Parse the format-control string and copy it into the string STRING,
2028 processing some kinds of escape sequence. */
2030 f
= string
= (char *) alloca (strlen (s
) + 1);
2038 error (_("Bad format string, non-terminated '\"'."));
2071 /* ??? TODO: handle other escape sequences. */
2072 error (_("Unrecognized escape character \\%c in format string."),
2082 /* Skip over " and following space and comma. */
2085 s
= skip_spaces (s
);
2087 if (*s
!= ',' && *s
!= 0)
2088 error (_("Invalid argument syntax"));
2092 s
= skip_spaces (s
);
2094 /* Need extra space for the '\0's. Doubling the size is sufficient. */
2095 substrings
= alloca (strlen (string
) * 2);
2096 current_substring
= substrings
;
2099 /* Now scan the string for %-specs and see what kinds of args they want.
2100 argclass[I] classifies the %-specs so we can give printf_filtered
2101 something of the right size. */
2105 int_arg
, long_arg
, long_long_arg
, ptr_arg
,
2106 string_arg
, wide_string_arg
, wide_char_arg
,
2107 double_arg
, long_double_arg
, decfloat_arg
2109 enum argclass
*argclass
;
2110 enum argclass this_argclass
;
2115 argclass
= (enum argclass
*) alloca (strlen (s
) * sizeof *argclass
);
2122 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
2123 int seen_space
= 0, seen_plus
= 0;
2124 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
2125 int seen_big_d
= 0, seen_double_big_d
= 0;
2128 /* Check the validity of the format specifier, and work
2129 out what argument it expects. We only accept C89
2130 format strings, with the exception of long long (which
2131 we autoconf for). */
2133 /* Skip over "%%". */
2140 /* The first part of a format specifier is a set of flag
2142 while (strchr ("0-+ #", *f
))
2155 /* The next part of a format specifier is a width. */
2156 while (strchr ("0123456789", *f
))
2159 /* The next part of a format specifier is a precision. */
2164 while (strchr ("0123456789", *f
))
2168 /* The next part of a format specifier is a length modifier. */
2189 /* Decimal32 modifier. */
2195 /* Decimal64 and Decimal128 modifiers. */
2200 /* Check for a Decimal128. */
2204 seen_double_big_d
= 1;
2220 if (seen_space
|| seen_plus
)
2227 this_argclass
= int_arg
;
2228 else if (lcount
== 1)
2229 this_argclass
= long_arg
;
2231 this_argclass
= long_long_arg
;
2238 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
2239 if (lcount
> 1 || seen_h
|| seen_big_l
)
2241 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2246 this_argclass
= ptr_arg
;
2247 if (lcount
|| seen_h
|| seen_big_l
)
2249 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2254 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
2255 if (lcount
> 1 || seen_h
|| seen_big_l
)
2257 if (seen_zero
|| seen_space
|| seen_plus
)
2266 if (seen_big_h
|| seen_big_d
|| seen_double_big_d
)
2267 this_argclass
= decfloat_arg
;
2268 else if (seen_big_l
)
2269 this_argclass
= long_double_arg
;
2271 this_argclass
= double_arg
;
2273 if (lcount
|| seen_h
)
2278 error (_("`*' not supported for precision or width in printf"));
2281 error (_("Format specifier `n' not supported in printf"));
2284 error (_("Incomplete format specifier at end of format string"));
2287 error (_("Unrecognized format specifier '%c' in printf"), *f
);
2291 error (_("Inappropriate modifiers to "
2292 "format specifier '%c' in printf"),
2297 if (lcount
> 1 && USE_PRINTF_I64
)
2299 /* Windows' printf does support long long, but not the usual way.
2300 Convert %lld to %I64d. */
2301 int length_before_ll
= f
- last_arg
- 1 - lcount
;
2303 strncpy (current_substring
, last_arg
, length_before_ll
);
2304 strcpy (current_substring
+ length_before_ll
, "I64");
2305 current_substring
[length_before_ll
+ 3] =
2306 last_arg
[length_before_ll
+ lcount
];
2307 current_substring
+= length_before_ll
+ 4;
2309 else if (this_argclass
== wide_string_arg
2310 || this_argclass
== wide_char_arg
)
2312 /* Convert %ls or %lc to %s. */
2313 int length_before_ls
= f
- last_arg
- 2;
2315 strncpy (current_substring
, last_arg
, length_before_ls
);
2316 strcpy (current_substring
+ length_before_ls
, "s");
2317 current_substring
+= length_before_ls
+ 2;
2321 strncpy (current_substring
, last_arg
, f
- last_arg
);
2322 current_substring
+= f
- last_arg
;
2324 *current_substring
++ = '\0';
2326 argclass
[nargs_wanted
++] = this_argclass
;
2329 /* Now, parse all arguments and evaluate them.
2330 Store the VALUEs in VAL_ARGS. */
2336 if (nargs
== allocated_args
)
2337 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2338 (allocated_args
*= 2)
2339 * sizeof (struct value
*));
2341 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2349 if (nargs
!= nargs_wanted
)
2350 error (_("Wrong number of arguments for specified format-string"));
2352 /* Now actually print them. */
2353 current_substring
= substrings
;
2354 for (i
= 0; i
< nargs
; i
++)
2356 switch (argclass
[i
])
2364 tem
= value_as_address (val_args
[i
]);
2366 /* This is a %s argument. Find the length of the string. */
2372 read_memory (tem
+ j
, &c
, 1);
2377 /* Copy the string contents into a string inside GDB. */
2378 str
= (gdb_byte
*) alloca (j
+ 1);
2380 read_memory (tem
, str
, j
);
2383 fprintf_filtered (stream
, current_substring
, (char *) str
);
2386 case wide_string_arg
:
2391 struct gdbarch
*gdbarch
2392 = get_type_arch (value_type (val_args
[i
]));
2393 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2394 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2395 "wchar_t", NULL
, 0);
2396 int wcwidth
= TYPE_LENGTH (wctype
);
2397 gdb_byte
*buf
= alloca (wcwidth
);
2398 struct obstack output
;
2399 struct cleanup
*inner_cleanup
;
2401 tem
= value_as_address (val_args
[i
]);
2403 /* This is a %s argument. Find the length of the string. */
2404 for (j
= 0;; j
+= wcwidth
)
2407 read_memory (tem
+ j
, buf
, wcwidth
);
2408 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2412 /* Copy the string contents into a string inside GDB. */
2413 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2415 read_memory (tem
, str
, j
);
2416 memset (&str
[j
], 0, wcwidth
);
2418 obstack_init (&output
);
2419 inner_cleanup
= make_cleanup_obstack_free (&output
);
2421 convert_between_encodings (target_wide_charset (gdbarch
),
2424 &output
, translit_char
);
2425 obstack_grow_str0 (&output
, "");
2427 fprintf_filtered (stream
, current_substring
,
2428 obstack_base (&output
));
2429 do_cleanups (inner_cleanup
);
2434 struct gdbarch
*gdbarch
2435 = get_type_arch (value_type (val_args
[i
]));
2436 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2437 "wchar_t", NULL
, 0);
2438 struct type
*valtype
;
2439 struct obstack output
;
2440 struct cleanup
*inner_cleanup
;
2441 const gdb_byte
*bytes
;
2443 valtype
= value_type (val_args
[i
]);
2444 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2445 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2446 error (_("expected wchar_t argument for %%lc"));
2448 bytes
= value_contents (val_args
[i
]);
2450 obstack_init (&output
);
2451 inner_cleanup
= make_cleanup_obstack_free (&output
);
2453 convert_between_encodings (target_wide_charset (gdbarch
),
2455 bytes
, TYPE_LENGTH (valtype
),
2456 TYPE_LENGTH (valtype
),
2457 &output
, translit_char
);
2458 obstack_grow_str0 (&output
, "");
2460 fprintf_filtered (stream
, current_substring
,
2461 obstack_base (&output
));
2462 do_cleanups (inner_cleanup
);
2467 struct type
*type
= value_type (val_args
[i
]);
2471 /* If format string wants a float, unchecked-convert the value
2472 to floating point of the same size. */
2473 type
= float_type_from_length (type
);
2474 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2476 error (_("Invalid floating value found in program."));
2478 fprintf_filtered (stream
, current_substring
, (double) val
);
2481 case long_double_arg
:
2482 #ifdef HAVE_LONG_DOUBLE
2484 struct type
*type
= value_type (val_args
[i
]);
2488 /* If format string wants a float, unchecked-convert the value
2489 to floating point of the same size. */
2490 type
= float_type_from_length (type
);
2491 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2493 error (_("Invalid floating value found in program."));
2495 fprintf_filtered (stream
, current_substring
,
2500 error (_("long double not supported in printf"));
2503 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2505 long long val
= value_as_long (val_args
[i
]);
2507 fprintf_filtered (stream
, current_substring
, val
);
2511 error (_("long long not supported in printf"));
2515 int val
= value_as_long (val_args
[i
]);
2517 fprintf_filtered (stream
, current_substring
, val
);
2522 long val
= value_as_long (val_args
[i
]);
2524 fprintf_filtered (stream
, current_substring
, val
);
2528 /* Handles decimal floating values. */
2531 const gdb_byte
*param_ptr
= value_contents (val_args
[i
]);
2533 #if defined (PRINTF_HAS_DECFLOAT)
2534 /* If we have native support for Decimal floating
2535 printing, handle it here. */
2536 fprintf_filtered (stream
, current_substring
, param_ptr
);
2539 /* As a workaround until vasprintf has native support for DFP
2540 we convert the DFP values to string and print them using
2541 the %s format specifier. */
2544 int nnull_chars
= 0;
2546 /* Parameter data. */
2547 struct type
*param_type
= value_type (val_args
[i
]);
2548 unsigned int param_len
= TYPE_LENGTH (param_type
);
2549 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2550 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2552 /* DFP output data. */
2553 struct value
*dfp_value
= NULL
;
2557 struct type
*dfp_type
= NULL
;
2558 char decstr
[MAX_DECIMAL_STRING
];
2560 /* Points to the end of the string so that we can go back
2561 and check for DFP length modifiers. */
2562 eos
= current_substring
+ strlen (current_substring
);
2564 /* Look for the float/double format specifier. */
2565 while (*eos
!= 'f' && *eos
!= 'e' && *eos
!= 'E'
2566 && *eos
!= 'g' && *eos
!= 'G')
2571 /* Search for the '%' char and extract the size and type of
2572 the output decimal value based on its modifiers
2573 (%Hf, %Df, %DDf). */
2574 while (*--sos
!= '%')
2579 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2581 else if (*sos
== 'D' && *(sos
- 1) == 'D')
2584 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2590 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2594 /* Replace %Hf, %Df and %DDf with %s's. */
2597 /* Go through the whole format string and pull the correct
2598 number of chars back to compensate for the change in the
2599 format specifier. */
2600 while (nnull_chars
< nargs
- i
)
2608 /* Conversion between different DFP types. */
2609 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2610 decimal_convert (param_ptr
, param_len
, byte_order
,
2611 dec
, dfp_len
, byte_order
);
2613 /* If this is a non-trivial conversion, just output 0.
2614 A correct converted value can be displayed by explicitly
2615 casting to a DFP type. */
2616 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2618 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2620 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2622 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2624 /* Print the DFP value. */
2625 fprintf_filtered (stream
, current_substring
, decstr
);
2633 /* We avoid the host's %p because pointers are too
2634 likely to be the wrong size. The only interesting
2635 modifier for %p is a width; extract that, and then
2636 handle %p as glibc would: %#x or a literal "(nil)". */
2638 char *p
, *fmt
, *fmt_p
;
2639 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2640 long long val
= value_as_long (val_args
[i
]);
2642 long val
= value_as_long (val_args
[i
]);
2645 fmt
= alloca (strlen (current_substring
) + 5);
2647 /* Copy up to the leading %. */
2648 p
= current_substring
;
2652 int is_percent
= (*p
== '%');
2667 /* Copy any width. */
2668 while (*p
>= '0' && *p
< '9')
2671 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2674 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2680 fprintf_filtered (stream
, fmt
, val
);
2686 fprintf_filtered (stream
, fmt
, "(nil)");
2692 internal_error (__FILE__
, __LINE__
,
2693 _("failed internal consistency check"));
2695 /* Skip to the next substring. */
2696 current_substring
+= strlen (current_substring
) + 1;
2698 /* Print the portion of the format string after the last argument.
2699 Note that this will not include any ordinary %-specs, but it
2700 might include "%%". That is why we use printf_filtered and not
2701 puts_filtered here. Also, we pass a dummy argument because
2702 some platforms have modified GCC to include -Wformat-security
2703 by default, which will warn here if there is no argument. */
2704 fprintf_filtered (stream
, last_arg
, 0);
2706 do_cleanups (old_cleanups
);
2709 /* Implement the "printf" command. */
2712 printf_command (char *arg
, int from_tty
)
2714 ui_printf (arg
, gdb_stdout
);
2717 /* Implement the "eval" command. */
2720 eval_command (char *arg
, int from_tty
)
2722 struct ui_file
*ui_out
= mem_fileopen ();
2723 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2726 ui_printf (arg
, ui_out
);
2728 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2729 make_cleanup (xfree
, expanded
);
2731 execute_command (expanded
, from_tty
);
2733 do_cleanups (cleanups
);
2737 _initialize_printcmd (void)
2739 struct cmd_list_element
*c
;
2741 current_display_number
= -1;
2743 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2745 add_info ("address", address_info
,
2746 _("Describe where symbol SYM is stored."));
2748 add_info ("symbol", sym_info
, _("\
2749 Describe what symbol is at location ADDR.\n\
2750 Only for symbols with fixed locations (global or static scope)."));
2752 add_com ("x", class_vars
, x_command
, _("\
2753 Examine memory: x/FMT ADDRESS.\n\
2754 ADDRESS is an expression for the memory address to examine.\n\
2755 FMT is a repeat count followed by a format letter and a size letter.\n\
2756 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2757 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2758 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2759 The specified number of objects of the specified size are printed\n\
2760 according to the format.\n\n\
2761 Defaults for format and size letters are those previously used.\n\
2762 Default count is 1. Default address is following last thing printed\n\
2763 with this command or \"print\"."));
2766 add_com ("whereis", class_vars
, whereis_command
,
2767 _("Print line number and file of definition of variable."));
2770 add_info ("display", display_info
, _("\
2771 Expressions to display when program stops, with code numbers."));
2773 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2774 Cancel some expressions to be displayed when program stops.\n\
2775 Arguments are the code numbers of the expressions to stop displaying.\n\
2776 No argument means cancel all automatic-display expressions.\n\
2777 \"delete display\" has the same effect as this command.\n\
2778 Do \"info display\" to see current list of code numbers."),
2781 add_com ("display", class_vars
, display_command
, _("\
2782 Print value of expression EXP each time the program stops.\n\
2783 /FMT may be used before EXP as in the \"print\" command.\n\
2784 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2785 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2786 and examining is done as in the \"x\" command.\n\n\
2787 With no argument, display all currently requested auto-display expressions.\n\
2788 Use \"undisplay\" to cancel display requests previously made."));
2790 add_cmd ("display", class_vars
, enable_display_command
, _("\
2791 Enable some expressions to be displayed when program stops.\n\
2792 Arguments are the code numbers of the expressions to resume displaying.\n\
2793 No argument means enable all automatic-display expressions.\n\
2794 Do \"info display\" to see current list of code numbers."), &enablelist
);
2796 add_cmd ("display", class_vars
, disable_display_command
, _("\
2797 Disable some expressions to be displayed when program stops.\n\
2798 Arguments are the code numbers of the expressions to stop displaying.\n\
2799 No argument means disable all automatic-display expressions.\n\
2800 Do \"info display\" to see current list of code numbers."), &disablelist
);
2802 add_cmd ("display", class_vars
, undisplay_command
, _("\
2803 Cancel some expressions to be displayed when program stops.\n\
2804 Arguments are the code numbers of the expressions to stop displaying.\n\
2805 No argument means cancel all automatic-display expressions.\n\
2806 Do \"info display\" to see current list of code numbers."), &deletelist
);
2808 add_com ("printf", class_vars
, printf_command
, _("\
2809 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2810 This is useful for formatted output in user-defined commands."));
2812 add_com ("output", class_vars
, output_command
, _("\
2813 Like \"print\" but don't put in value history and don't print newline.\n\
2814 This is useful in user-defined commands."));
2816 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2817 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2818 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2819 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2820 with $), a register (a few standard names starting with $), or an actual\n\
2821 variable in the program being debugged. EXP is any valid expression.\n\
2822 Use \"set variable\" for variables with names identical to set subcommands.\n\
2824 With a subcommand, this command modifies parts of the gdb environment.\n\
2825 You can see these environment settings with the \"show\" command."),
2826 &setlist
, "set ", 1, &cmdlist
);
2828 add_com ("assign", class_vars
, set_command
, _("\
2829 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2830 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2831 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2832 with $), a register (a few standard names starting with $), or an actual\n\
2833 variable in the program being debugged. EXP is any valid expression.\n\
2834 Use \"set variable\" for variables with names identical to set subcommands.\n\
2835 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2836 You can see these environment settings with the \"show\" command."));
2838 /* "call" is the same as "set", but handy for dbx users to call fns. */
2839 c
= add_com ("call", class_vars
, call_command
, _("\
2840 Call a function in the program.\n\
2841 The argument is the function name and arguments, in the notation of the\n\
2842 current working language. The result is printed and saved in the value\n\
2843 history, if it is not void."));
2844 set_cmd_completer (c
, expression_completer
);
2846 add_cmd ("variable", class_vars
, set_command
, _("\
2847 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2848 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2849 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2850 with $), a register (a few standard names starting with $), or an actual\n\
2851 variable in the program being debugged. EXP is any valid expression.\n\
2852 This may usually be abbreviated to simply \"set\"."),
2855 c
= add_com ("print", class_vars
, print_command
, _("\
2856 Print value of expression EXP.\n\
2857 Variables accessible are those of the lexical environment of the selected\n\
2858 stack frame, plus all those whose scope is global or an entire file.\n\
2860 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2861 $$NUM refers to NUM'th value back from the last one.\n\
2862 Names starting with $ refer to registers (with the values they would have\n\
2863 if the program were to return to the stack frame now selected, restoring\n\
2864 all registers saved by frames farther in) or else to debugger\n\
2865 \"convenience\" variables (any such name not a known register).\n\
2866 Use assignment expressions to give values to convenience variables.\n\
2868 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2869 @ is a binary operator for treating consecutive data objects\n\
2870 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2871 element is FOO, whose second element is stored in the space following\n\
2872 where FOO is stored, etc. FOO must be an expression whose value\n\
2873 resides in memory.\n\
2875 EXP may be preceded with /FMT, where FMT is a format letter\n\
2876 but no count or size letter (see \"x\" command)."));
2877 set_cmd_completer (c
, expression_completer
);
2878 add_com_alias ("p", "print", class_vars
, 1);
2880 c
= add_com ("inspect", class_vars
, inspect_command
, _("\
2881 Same as \"print\" command, except that if you are running in the epoch\n\
2882 environment, the value is printed in its own window."));
2883 set_cmd_completer (c
, expression_completer
);
2885 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2886 &max_symbolic_offset
, _("\
2887 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2888 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2890 show_max_symbolic_offset
,
2891 &setprintlist
, &showprintlist
);
2892 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2893 &print_symbol_filename
, _("\
2894 Set printing of source filename and line number with <symbol>."), _("\
2895 Show printing of source filename and line number with <symbol>."), NULL
,
2897 show_print_symbol_filename
,
2898 &setprintlist
, &showprintlist
);
2900 add_com ("eval", no_class
, eval_command
, _("\
2901 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2902 a command line, and call it."));