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. Returns
572 non-zero if anything was printed; zero otherwise. */
575 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
576 struct ui_file
*stream
,
577 int do_demangle
, char *leadin
)
580 char *filename
= NULL
;
585 /* Throw away both name and filename. */
586 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
587 make_cleanup (free_current_contents
, &filename
);
589 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
590 &filename
, &line
, &unmapped
))
592 do_cleanups (cleanup_chain
);
596 fputs_filtered (leadin
, stream
);
598 fputs_filtered ("<*", stream
);
600 fputs_filtered ("<", stream
);
601 fputs_filtered (name
, stream
);
603 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
605 /* Append source filename and line number if desired. Give specific
606 line # of this addr, if we have it; else line # of the nearest symbol. */
607 if (print_symbol_filename
&& filename
!= NULL
)
610 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
612 fprintf_filtered (stream
, " in %s", filename
);
615 fputs_filtered ("*>", stream
);
617 fputs_filtered (">", stream
);
619 do_cleanups (cleanup_chain
);
623 /* Given an address ADDR return all the elements needed to print the
624 address in a symbolic form. NAME can be mangled or not depending
625 on DO_DEMANGLE (and also on the asm_demangle global variable,
626 manipulated via ''set print asm-demangle''). Return 0 in case of
627 success, when all the info in the OUT paramters is valid. Return 1
630 build_address_symbolic (struct gdbarch
*gdbarch
,
631 CORE_ADDR addr
, /* IN */
632 int do_demangle
, /* IN */
633 char **name
, /* OUT */
634 int *offset
, /* OUT */
635 char **filename
, /* OUT */
637 int *unmapped
) /* OUT */
639 struct minimal_symbol
*msymbol
;
640 struct symbol
*symbol
;
641 CORE_ADDR name_location
= 0;
642 struct obj_section
*section
= NULL
;
643 const char *name_temp
= "";
645 /* Let's say it is mapped (not unmapped). */
648 /* Determine if the address is in an overlay, and whether it is
650 if (overlay_debugging
)
652 section
= find_pc_overlay (addr
);
653 if (pc_in_unmapped_range (addr
, section
))
656 addr
= overlay_mapped_address (addr
, section
);
660 /* First try to find the address in the symbol table, then
661 in the minsyms. Take the closest one. */
663 /* This is defective in the sense that it only finds text symbols. So
664 really this is kind of pointless--we should make sure that the
665 minimal symbols have everything we need (by changing that we could
666 save some memory, but for many debug format--ELF/DWARF or
667 anything/stabs--it would be inconvenient to eliminate those minimal
669 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
670 symbol
= find_pc_sect_function (addr
, section
);
674 /* If this is a function (i.e. a code address), strip out any
675 non-address bits. For instance, display a pointer to the
676 first instruction of a Thumb function as <function>; the
677 second instruction will be <function+2>, even though the
678 pointer is <function+3>. This matches the ISA behavior. */
679 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
681 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
682 if (do_demangle
|| asm_demangle
)
683 name_temp
= SYMBOL_PRINT_NAME (symbol
);
685 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
689 && MSYMBOL_SIZE (msymbol
) == 0
690 && MSYMBOL_TYPE (msymbol
) != mst_text
691 && MSYMBOL_TYPE (msymbol
) != mst_text_gnu_ifunc
692 && MSYMBOL_TYPE (msymbol
) != mst_file_text
)
697 if (SYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
699 /* The msymbol is closer to the address than the symbol;
700 use the msymbol instead. */
702 name_location
= SYMBOL_VALUE_ADDRESS (msymbol
);
703 if (do_demangle
|| asm_demangle
)
704 name_temp
= SYMBOL_PRINT_NAME (msymbol
);
706 name_temp
= SYMBOL_LINKAGE_NAME (msymbol
);
709 if (symbol
== NULL
&& msymbol
== NULL
)
712 /* If the nearest symbol is too far away, don't print anything symbolic. */
714 /* For when CORE_ADDR is larger than unsigned int, we do math in
715 CORE_ADDR. But when we detect unsigned wraparound in the
716 CORE_ADDR math, we ignore this test and print the offset,
717 because addr+max_symbolic_offset has wrapped through the end
718 of the address space back to the beginning, giving bogus comparison. */
719 if (addr
> name_location
+ max_symbolic_offset
720 && name_location
+ max_symbolic_offset
> name_location
)
723 *offset
= addr
- name_location
;
725 *name
= xstrdup (name_temp
);
727 if (print_symbol_filename
)
729 struct symtab_and_line sal
;
731 sal
= find_pc_sect_line (addr
, section
, 0);
735 *filename
= xstrdup (sal
.symtab
->filename
);
743 /* Print address ADDR symbolically on STREAM.
744 First print it as a number. Then perhaps print
745 <SYMBOL + OFFSET> after the number. */
748 print_address (struct gdbarch
*gdbarch
,
749 CORE_ADDR addr
, struct ui_file
*stream
)
751 fputs_filtered (paddress (gdbarch
, addr
), stream
);
752 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
755 /* Return a prefix for instruction address:
756 "=> " for current instruction, else " ". */
759 pc_prefix (CORE_ADDR addr
)
761 if (has_stack_frames ())
763 struct frame_info
*frame
;
766 frame
= get_selected_frame (NULL
);
767 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
773 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
774 controls whether to print the symbolic name "raw" or demangled.
775 Return non-zero if anything was printed; zero otherwise. */
778 print_address_demangle (const struct value_print_options
*opts
,
779 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
780 struct ui_file
*stream
, int do_demangle
)
782 if (opts
->addressprint
)
784 fputs_filtered (paddress (gdbarch
, addr
), stream
);
785 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
789 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
795 /* Examine data at address ADDR in format FMT.
796 Fetch it from memory and print on gdb_stdout. */
799 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
804 struct type
*val_type
= NULL
;
807 struct value_print_options opts
;
812 next_gdbarch
= gdbarch
;
815 /* Instruction format implies fetch single bytes
816 regardless of the specified size.
817 The case of strings is handled in decode_format, only explicit
818 size operator are not changed to 'b'. */
824 /* Pick the appropriate size for an address. */
825 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
827 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
829 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
832 /* Bad value for gdbarch_ptr_bit. */
833 internal_error (__FILE__
, __LINE__
,
834 _("failed internal consistency check"));
838 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
839 else if (size
== 'h')
840 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
841 else if (size
== 'w')
842 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
843 else if (size
== 'g')
844 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
848 struct type
*char_type
= NULL
;
850 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
851 if type is not found. */
853 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
854 else if (size
== 'w')
855 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
857 val_type
= char_type
;
860 if (size
!= '\0' && size
!= 'b')
861 warning (_("Unable to display strings with "
862 "size '%c', using 'b' instead."), size
);
864 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
873 if (format
== 's' || format
== 'i')
876 get_formatted_print_options (&opts
, format
);
878 /* Print as many objects as specified in COUNT, at most maxelts per line,
879 with the address of the next one at the start of each line. */
885 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
886 print_address (next_gdbarch
, next_address
, gdb_stdout
);
887 printf_filtered (":");
892 printf_filtered ("\t");
893 /* Note that print_formatted sets next_address for the next
895 last_examine_address
= next_address
;
897 if (last_examine_value
)
898 value_free (last_examine_value
);
900 /* The value to be displayed is not fetched greedily.
901 Instead, to avoid the possibility of a fetched value not
902 being used, its retrieval is delayed until the print code
903 uses it. When examining an instruction stream, the
904 disassembler will perform its own memory fetch using just
905 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
906 the disassembler be modified so that LAST_EXAMINE_VALUE
907 is left with the byte sequence from the last complete
908 instruction fetched from memory? */
909 last_examine_value
= value_at_lazy (val_type
, next_address
);
911 if (last_examine_value
)
912 release_value (last_examine_value
);
914 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
916 /* Display any branch delay slots following the final insn. */
917 if (format
== 'i' && count
== 1)
918 count
+= branch_delay_insns
;
920 printf_filtered ("\n");
921 gdb_flush (gdb_stdout
);
926 validate_format (struct format_data fmt
, char *cmdname
)
929 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
931 error (_("Item count other than 1 is meaningless in \"%s\" command."),
933 if (fmt
.format
== 'i')
934 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
935 fmt
.format
, cmdname
);
938 /* Evaluate string EXP as an expression in the current language and
939 print the resulting value. EXP may contain a format specifier as the
940 first argument ("/x myvar" for example, to print myvar in hex). */
943 print_command_1 (char *exp
, int inspect
, int voidprint
)
945 struct expression
*expr
;
946 struct cleanup
*old_chain
= 0;
949 struct format_data fmt
;
952 if (exp
&& *exp
== '/')
955 fmt
= decode_format (&exp
, last_format
, 0);
956 validate_format (fmt
, "print");
957 last_format
= format
= fmt
.format
;
969 expr
= parse_expression (exp
);
970 old_chain
= make_cleanup (free_current_contents
, &expr
);
972 val
= evaluate_expression (expr
);
975 val
= access_value_history (0);
977 if (voidprint
|| (val
&& value_type (val
) &&
978 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
980 struct value_print_options opts
;
981 int histindex
= record_latest_value (val
);
984 annotate_value_history_begin (histindex
, value_type (val
));
986 annotate_value_begin (value_type (val
));
989 printf_unfiltered ("\031(gdb-makebuffer \"%s\" %d '(\"",
991 else if (histindex
>= 0)
992 printf_filtered ("$%d = ", histindex
);
995 annotate_value_history_value ();
997 get_formatted_print_options (&opts
, format
);
998 opts
.inspect_it
= inspect
;
1001 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1002 printf_filtered ("\n");
1005 annotate_value_history_end ();
1007 annotate_value_end ();
1010 printf_unfiltered ("\") )\030");
1014 do_cleanups (old_chain
);
1018 print_command (char *exp
, int from_tty
)
1020 print_command_1 (exp
, 0, 1);
1023 /* Same as print, except in epoch, it gets its own window. */
1025 inspect_command (char *exp
, int from_tty
)
1027 extern int epoch_interface
;
1029 print_command_1 (exp
, epoch_interface
, 1);
1032 /* Same as print, except it doesn't print void results. */
1034 call_command (char *exp
, int from_tty
)
1036 print_command_1 (exp
, 0, 0);
1040 output_command (char *exp
, int from_tty
)
1042 struct expression
*expr
;
1043 struct cleanup
*old_chain
;
1046 struct format_data fmt
;
1047 struct value_print_options opts
;
1052 if (exp
&& *exp
== '/')
1055 fmt
= decode_format (&exp
, 0, 0);
1056 validate_format (fmt
, "output");
1057 format
= fmt
.format
;
1060 expr
= parse_expression (exp
);
1061 old_chain
= make_cleanup (free_current_contents
, &expr
);
1063 val
= evaluate_expression (expr
);
1065 annotate_value_begin (value_type (val
));
1067 get_formatted_print_options (&opts
, format
);
1069 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1071 annotate_value_end ();
1074 gdb_flush (gdb_stdout
);
1076 do_cleanups (old_chain
);
1080 set_command (char *exp
, int from_tty
)
1082 struct expression
*expr
= parse_expression (exp
);
1083 struct cleanup
*old_chain
=
1084 make_cleanup (free_current_contents
, &expr
);
1086 if (expr
->nelts
>= 1)
1087 switch (expr
->elts
[0].opcode
)
1089 case UNOP_PREINCREMENT
:
1090 case UNOP_POSTINCREMENT
:
1091 case UNOP_PREDECREMENT
:
1092 case UNOP_POSTDECREMENT
:
1094 case BINOP_ASSIGN_MODIFY
:
1099 (_("Expression is not an assignment (and might have no effect)"));
1102 evaluate_expression (expr
);
1103 do_cleanups (old_chain
);
1107 sym_info (char *arg
, int from_tty
)
1109 struct minimal_symbol
*msymbol
;
1110 struct objfile
*objfile
;
1111 struct obj_section
*osect
;
1112 CORE_ADDR addr
, sect_addr
;
1114 unsigned int offset
;
1117 error_no_arg (_("address"));
1119 addr
= parse_and_eval_address (arg
);
1120 ALL_OBJSECTIONS (objfile
, osect
)
1122 /* Only process each object file once, even if there's a separate
1124 if (objfile
->separate_debug_objfile_backlink
)
1127 sect_addr
= overlay_mapped_address (addr
, osect
);
1129 if (obj_section_addr (osect
) <= sect_addr
1130 && sect_addr
< obj_section_endaddr (osect
)
1131 && (msymbol
= lookup_minimal_symbol_by_pc_section (sect_addr
, osect
)))
1133 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1135 struct cleanup
*old_chain
;
1138 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1139 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1140 sec_name
= osect
->the_bfd_section
->name
;
1141 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1143 /* Don't print the offset if it is zero.
1144 We assume there's no need to handle i18n of "sym + offset". */
1146 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1148 loc_string
= xstrprintf ("%s", msym_name
);
1150 /* Use a cleanup to free loc_string in case the user quits
1151 a pagination request inside printf_filtered. */
1152 old_chain
= make_cleanup (xfree
, loc_string
);
1154 gdb_assert (osect
->objfile
&& osect
->objfile
->name
);
1155 obj_name
= osect
->objfile
->name
;
1157 if (MULTI_OBJFILE_P ())
1158 if (pc_in_unmapped_range (addr
, osect
))
1159 if (section_is_overlay (osect
))
1160 printf_filtered (_("%s in load address range of "
1161 "%s overlay section %s of %s\n"),
1162 loc_string
, mapped
, sec_name
, obj_name
);
1164 printf_filtered (_("%s in load address range of "
1165 "section %s of %s\n"),
1166 loc_string
, sec_name
, obj_name
);
1168 if (section_is_overlay (osect
))
1169 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1170 loc_string
, mapped
, sec_name
, obj_name
);
1172 printf_filtered (_("%s in section %s of %s\n"),
1173 loc_string
, sec_name
, obj_name
);
1175 if (pc_in_unmapped_range (addr
, osect
))
1176 if (section_is_overlay (osect
))
1177 printf_filtered (_("%s in load address range of %s overlay "
1179 loc_string
, mapped
, sec_name
);
1181 printf_filtered (_("%s in load address range of section %s\n"),
1182 loc_string
, sec_name
);
1184 if (section_is_overlay (osect
))
1185 printf_filtered (_("%s in %s overlay section %s\n"),
1186 loc_string
, mapped
, sec_name
);
1188 printf_filtered (_("%s in section %s\n"),
1189 loc_string
, sec_name
);
1191 do_cleanups (old_chain
);
1195 printf_filtered (_("No symbol matches %s.\n"), arg
);
1199 address_info (char *exp
, int from_tty
)
1201 struct gdbarch
*gdbarch
;
1204 struct minimal_symbol
*msymbol
;
1206 struct obj_section
*section
;
1207 CORE_ADDR load_addr
, context_pc
= 0;
1208 int is_a_field_of_this
; /* C++: lookup_symbol sets this to nonzero
1209 if exp is a field of `this'. */
1212 error (_("Argument required."));
1214 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1215 &is_a_field_of_this
);
1218 if (is_a_field_of_this
)
1220 printf_filtered ("Symbol \"");
1221 fprintf_symbol_filtered (gdb_stdout
, exp
,
1222 current_language
->la_language
, DMGL_ANSI
);
1223 printf_filtered ("\" is a field of the local class variable ");
1224 if (current_language
->la_language
== language_objc
)
1225 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1227 printf_filtered ("`this'\n");
1231 msymbol
= lookup_minimal_symbol (exp
, NULL
, NULL
);
1233 if (msymbol
!= NULL
)
1235 gdbarch
= get_objfile_arch (msymbol_objfile (msymbol
));
1236 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1238 printf_filtered ("Symbol \"");
1239 fprintf_symbol_filtered (gdb_stdout
, exp
,
1240 current_language
->la_language
, DMGL_ANSI
);
1241 printf_filtered ("\" is at ");
1242 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1243 printf_filtered (" in a file compiled without debugging");
1244 section
= SYMBOL_OBJ_SECTION (msymbol
);
1245 if (section_is_overlay (section
))
1247 load_addr
= overlay_unmapped_address (load_addr
, section
);
1248 printf_filtered (",\n -- loaded at ");
1249 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1250 printf_filtered (" in overlay section %s",
1251 section
->the_bfd_section
->name
);
1253 printf_filtered (".\n");
1256 error (_("No symbol \"%s\" in current context."), exp
);
1260 printf_filtered ("Symbol \"");
1261 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1262 current_language
->la_language
, DMGL_ANSI
);
1263 printf_filtered ("\" is ");
1264 val
= SYMBOL_VALUE (sym
);
1265 section
= SYMBOL_OBJ_SECTION (sym
);
1266 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1268 switch (SYMBOL_CLASS (sym
))
1271 case LOC_CONST_BYTES
:
1272 printf_filtered ("constant");
1276 printf_filtered ("a label at address ");
1277 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1278 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1279 if (section_is_overlay (section
))
1281 load_addr
= overlay_unmapped_address (load_addr
, section
);
1282 printf_filtered (",\n -- loaded at ");
1283 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1284 printf_filtered (" in overlay section %s",
1285 section
->the_bfd_section
->name
);
1290 /* FIXME: cagney/2004-01-26: It should be possible to
1291 unconditionally call the SYMBOL_COMPUTED_OPS method when available.
1292 Unfortunately DWARF 2 stores the frame-base (instead of the
1293 function) location in a function's symbol. Oops! For the
1294 moment enable this when/where applicable. */
1295 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1300 /* GDBARCH is the architecture associated with the objfile the symbol
1301 is defined in; the target architecture may be different, and may
1302 provide additional registers. However, we do not know the target
1303 architecture at this point. We assume the objfile architecture
1304 will contain all the standard registers that occur in debug info
1306 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1308 if (SYMBOL_IS_ARGUMENT (sym
))
1309 printf_filtered (_("an argument in register %s"),
1310 gdbarch_register_name (gdbarch
, regno
));
1312 printf_filtered (_("a variable in register %s"),
1313 gdbarch_register_name (gdbarch
, regno
));
1317 printf_filtered (_("static storage at address "));
1318 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1319 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1320 if (section_is_overlay (section
))
1322 load_addr
= overlay_unmapped_address (load_addr
, section
);
1323 printf_filtered (_(",\n -- loaded at "));
1324 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1325 printf_filtered (_(" in overlay section %s"),
1326 section
->the_bfd_section
->name
);
1330 case LOC_REGPARM_ADDR
:
1331 /* Note comment at LOC_REGISTER. */
1332 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1333 printf_filtered (_("address of an argument in register %s"),
1334 gdbarch_register_name (gdbarch
, regno
));
1338 printf_filtered (_("an argument at offset %ld"), val
);
1342 printf_filtered (_("a local variable at frame offset %ld"), val
);
1346 printf_filtered (_("a reference argument at offset %ld"), val
);
1350 printf_filtered (_("a typedef"));
1354 printf_filtered (_("a function at address "));
1355 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1356 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1357 if (section_is_overlay (section
))
1359 load_addr
= overlay_unmapped_address (load_addr
, section
);
1360 printf_filtered (_(",\n -- loaded at "));
1361 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1362 printf_filtered (_(" in overlay section %s"),
1363 section
->the_bfd_section
->name
);
1367 case LOC_UNRESOLVED
:
1369 struct minimal_symbol
*msym
;
1371 msym
= lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (sym
), NULL
, NULL
);
1373 printf_filtered ("unresolved");
1376 section
= SYMBOL_OBJ_SECTION (msym
);
1377 load_addr
= SYMBOL_VALUE_ADDRESS (msym
);
1380 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1381 printf_filtered (_("a thread-local variable at offset %s "
1382 "in the thread-local storage for `%s'"),
1383 paddress (gdbarch
, load_addr
),
1384 section
->objfile
->name
);
1387 printf_filtered (_("static storage at address "));
1388 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1389 if (section_is_overlay (section
))
1391 load_addr
= overlay_unmapped_address (load_addr
, section
);
1392 printf_filtered (_(",\n -- loaded at "));
1393 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1394 printf_filtered (_(" in overlay section %s"),
1395 section
->the_bfd_section
->name
);
1402 case LOC_OPTIMIZED_OUT
:
1403 printf_filtered (_("optimized out"));
1407 printf_filtered (_("of unknown (botched) type"));
1410 printf_filtered (".\n");
1415 x_command (char *exp
, int from_tty
)
1417 struct expression
*expr
;
1418 struct format_data fmt
;
1419 struct cleanup
*old_chain
;
1422 fmt
.format
= last_format
? last_format
: 'x';
1423 fmt
.size
= last_size
;
1427 if (exp
&& *exp
== '/')
1430 fmt
= decode_format (&exp
, last_format
, last_size
);
1433 /* If we have an expression, evaluate it and use it as the address. */
1435 if (exp
!= 0 && *exp
!= 0)
1437 expr
= parse_expression (exp
);
1438 /* Cause expression not to be there any more if this command is
1439 repeated with Newline. But don't clobber a user-defined
1440 command's definition. */
1443 old_chain
= make_cleanup (free_current_contents
, &expr
);
1444 val
= evaluate_expression (expr
);
1445 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1446 val
= coerce_ref (val
);
1447 /* In rvalue contexts, such as this, functions are coerced into
1448 pointers to functions. This makes "x/i main" work. */
1449 if (/* last_format == 'i' && */
1450 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1451 && VALUE_LVAL (val
) == lval_memory
)
1452 next_address
= value_address (val
);
1454 next_address
= value_as_address (val
);
1456 next_gdbarch
= expr
->gdbarch
;
1457 do_cleanups (old_chain
);
1461 error_no_arg (_("starting display address"));
1463 do_examine (fmt
, next_gdbarch
, next_address
);
1465 /* If the examine succeeds, we remember its size and format for next
1466 time. Set last_size to 'b' for strings. */
1467 if (fmt
.format
== 's')
1470 last_size
= fmt
.size
;
1471 last_format
= fmt
.format
;
1473 /* Set a couple of internal variables if appropriate. */
1474 if (last_examine_value
)
1476 /* Make last address examined available to the user as $_. Use
1477 the correct pointer type. */
1478 struct type
*pointer_type
1479 = lookup_pointer_type (value_type (last_examine_value
));
1480 set_internalvar (lookup_internalvar ("_"),
1481 value_from_pointer (pointer_type
,
1482 last_examine_address
));
1484 /* Make contents of last address examined available to the user
1485 as $__. If the last value has not been fetched from memory
1486 then don't fetch it now; instead mark it by voiding the $__
1488 if (value_lazy (last_examine_value
))
1489 clear_internalvar (lookup_internalvar ("__"));
1491 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1496 /* Add an expression to the auto-display chain.
1497 Specify the expression. */
1500 display_command (char *exp
, int from_tty
)
1502 struct format_data fmt
;
1503 struct expression
*expr
;
1504 struct display
*new;
1508 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1510 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1511 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1525 fmt
= decode_format (&exp
, 0, 0);
1526 if (fmt
.size
&& fmt
.format
== 0)
1528 if (fmt
.format
== 'i' || fmt
.format
== 's')
1539 innermost_block
= NULL
;
1540 expr
= parse_expression (exp
);
1542 new = (struct display
*) xmalloc (sizeof (struct display
));
1544 new->exp_string
= xstrdup (exp
);
1546 new->block
= innermost_block
;
1547 new->pspace
= current_program_space
;
1548 new->next
= display_chain
;
1549 new->number
= ++display_number
;
1552 display_chain
= new;
1554 if (from_tty
&& target_has_execution
)
1555 do_one_display (new);
1562 free_display (struct display
*d
)
1564 xfree (d
->exp_string
);
1569 /* Clear out the display_chain. Done when new symtabs are loaded,
1570 since this invalidates the types stored in many expressions. */
1573 clear_displays (void)
1577 while ((d
= display_chain
) != NULL
)
1579 display_chain
= d
->next
;
1584 /* Delete the auto-display DISPLAY. */
1587 delete_display (struct display
*display
)
1591 gdb_assert (display
!= NULL
);
1593 if (display_chain
== display
)
1594 display_chain
= display
->next
;
1597 if (d
->next
== display
)
1599 d
->next
= display
->next
;
1603 free_display (display
);
1606 /* Call FUNCTION on each of the displays whose numbers are given in
1607 ARGS. DATA is passed unmodified to FUNCTION. */
1610 map_display_numbers (char *args
,
1611 void (*function
) (struct display
*,
1615 struct get_number_or_range_state state
;
1616 struct display
*b
, *tmp
;
1620 error_no_arg (_("one or more display numbers"));
1622 init_number_or_range (&state
, args
);
1624 while (!state
.finished
)
1626 char *p
= state
.string
;
1628 num
= get_number_or_range (&state
);
1630 warning (_("bad display number at or near '%s'"), p
);
1633 struct display
*d
, *tmp
;
1635 ALL_DISPLAYS_SAFE (d
, tmp
)
1636 if (d
->number
== num
)
1639 printf_unfiltered (_("No display number %d.\n"), num
);
1646 /* Callback for map_display_numbers, that deletes a display. */
1649 do_delete_display (struct display
*d
, void *data
)
1654 /* "undisplay" command. */
1657 undisplay_command (char *args
, int from_tty
)
1660 struct get_number_or_range_state state
;
1664 if (query (_("Delete all auto-display expressions? ")))
1670 map_display_numbers (args
, do_delete_display
, NULL
);
1674 /* Display a single auto-display.
1675 Do nothing if the display cannot be printed in the current context,
1676 or if the display is disabled. */
1679 do_one_display (struct display
*d
)
1681 struct cleanup
*old_chain
;
1682 int within_current_scope
;
1684 if (d
->enabled_p
== 0)
1687 /* The expression carries the architecture that was used at parse time.
1688 This is a problem if the expression depends on architecture features
1689 (e.g. register numbers), and the current architecture is now different.
1690 For example, a display statement like "display/i $pc" is expected to
1691 display the PC register of the current architecture, not the arch at
1692 the time the display command was given. Therefore, we re-parse the
1693 expression if the current architecture has changed. */
1694 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1703 volatile struct gdb_exception ex
;
1705 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1707 innermost_block
= NULL
;
1708 d
->exp
= parse_expression (d
->exp_string
);
1709 d
->block
= innermost_block
;
1713 /* Can't re-parse the expression. Disable this display item. */
1715 warning (_("Unable to display \"%s\": %s"),
1716 d
->exp_string
, ex
.message
);
1723 if (d
->pspace
== current_program_space
)
1724 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1726 within_current_scope
= 0;
1729 within_current_scope
= 1;
1730 if (!within_current_scope
)
1733 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1734 current_display_number
= d
->number
;
1736 annotate_display_begin ();
1737 printf_filtered ("%d", d
->number
);
1738 annotate_display_number_end ();
1739 printf_filtered (": ");
1742 volatile struct gdb_exception ex
;
1744 annotate_display_format ();
1746 printf_filtered ("x/");
1747 if (d
->format
.count
!= 1)
1748 printf_filtered ("%d", d
->format
.count
);
1749 printf_filtered ("%c", d
->format
.format
);
1750 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1751 printf_filtered ("%c", d
->format
.size
);
1752 printf_filtered (" ");
1754 annotate_display_expression ();
1756 puts_filtered (d
->exp_string
);
1757 annotate_display_expression_end ();
1759 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1760 printf_filtered ("\n");
1762 printf_filtered (" ");
1764 annotate_display_value ();
1766 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1771 val
= evaluate_expression (d
->exp
);
1772 addr
= value_as_address (val
);
1773 if (d
->format
.format
== 'i')
1774 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1775 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1778 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1782 struct value_print_options opts
;
1783 volatile struct gdb_exception ex
;
1785 annotate_display_format ();
1787 if (d
->format
.format
)
1788 printf_filtered ("/%c ", d
->format
.format
);
1790 annotate_display_expression ();
1792 puts_filtered (d
->exp_string
);
1793 annotate_display_expression_end ();
1795 printf_filtered (" = ");
1797 annotate_display_expression ();
1799 get_formatted_print_options (&opts
, d
->format
.format
);
1800 opts
.raw
= d
->format
.raw
;
1802 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1806 val
= evaluate_expression (d
->exp
);
1807 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1810 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1811 printf_filtered ("\n");
1814 annotate_display_end ();
1816 gdb_flush (gdb_stdout
);
1817 do_cleanups (old_chain
);
1820 /* Display all of the values on the auto-display chain which can be
1821 evaluated in the current scope. */
1828 for (d
= display_chain
; d
; d
= d
->next
)
1832 /* Delete the auto-display which we were in the process of displaying.
1833 This is done when there is an error or a signal. */
1836 disable_display (int num
)
1840 for (d
= display_chain
; d
; d
= d
->next
)
1841 if (d
->number
== num
)
1846 printf_unfiltered (_("No display number %d.\n"), num
);
1850 disable_current_display (void)
1852 if (current_display_number
>= 0)
1854 disable_display (current_display_number
);
1855 fprintf_unfiltered (gdb_stderr
,
1856 _("Disabling display %d to "
1857 "avoid infinite recursion.\n"),
1858 current_display_number
);
1860 current_display_number
= -1;
1864 display_info (char *ignore
, int from_tty
)
1869 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1871 printf_filtered (_("Auto-display expressions now in effect:\n\
1872 Num Enb Expression\n"));
1874 for (d
= display_chain
; d
; d
= d
->next
)
1876 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1878 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1880 else if (d
->format
.format
)
1881 printf_filtered ("/%c ", d
->format
.format
);
1882 puts_filtered (d
->exp_string
);
1883 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1884 printf_filtered (_(" (cannot be evaluated in the current context)"));
1885 printf_filtered ("\n");
1886 gdb_flush (gdb_stdout
);
1890 /* Callback fo map_display_numbers, that enables or disables the
1891 passed in display D. */
1894 do_enable_disable_display (struct display
*d
, void *data
)
1896 d
->enabled_p
= *(int *) data
;
1899 /* Implamentation of both the "disable display" and "enable display"
1900 commands. ENABLE decides what to do. */
1903 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1910 d
->enabled_p
= enable
;
1914 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1917 /* The "enable display" command. */
1920 enable_display_command (char *args
, int from_tty
)
1922 enable_disable_display_command (args
, from_tty
, 1);
1925 /* The "disable display" command. */
1928 disable_display_command (char *args
, int from_tty
)
1930 enable_disable_display_command (args
, from_tty
, 0);
1933 /* display_chain items point to blocks and expressions. Some expressions in
1934 turn may point to symbols.
1935 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1936 obstack_free'd when a shared library is unloaded.
1937 Clear pointers that are about to become dangling.
1938 Both .exp and .block fields will be restored next time we need to display
1939 an item by re-parsing .exp_string field in the new execution context. */
1942 clear_dangling_display_expressions (struct so_list
*solib
)
1944 struct objfile
*objfile
= solib
->objfile
;
1947 /* With no symbol file we cannot have a block or expression from it. */
1948 if (objfile
== NULL
)
1950 if (objfile
->separate_debug_objfile_backlink
)
1951 objfile
= objfile
->separate_debug_objfile_backlink
;
1952 gdb_assert (objfile
->pspace
== solib
->pspace
);
1954 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1956 if (d
->pspace
!= solib
->pspace
)
1959 if (lookup_objfile_from_block (d
->block
) == objfile
1960 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1970 /* Print the value in stack frame FRAME of a variable specified by a
1971 struct symbol. NAME is the name to print; if NULL then VAR's print
1972 name will be used. STREAM is the ui_file on which to print the
1973 value. INDENT specifies the number of indent levels to print
1974 before printing the variable name. */
1977 print_variable_and_value (const char *name
, struct symbol
*var
,
1978 struct frame_info
*frame
,
1979 struct ui_file
*stream
, int indent
)
1981 volatile struct gdb_exception except
;
1984 name
= SYMBOL_PRINT_NAME (var
);
1986 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1987 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1990 struct value_print_options opts
;
1992 val
= read_var_value (var
, frame
);
1993 get_user_print_options (&opts
);
1995 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1997 if (except
.reason
< 0)
1998 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
2000 fprintf_filtered (stream
, "\n");
2003 /* printf "printf format string" ARG to STREAM. */
2006 ui_printf (char *arg
, struct ui_file
*stream
)
2010 char *string
= NULL
;
2011 struct value
**val_args
;
2013 char *current_substring
;
2015 int allocated_args
= 20;
2016 struct cleanup
*old_cleanups
;
2018 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2019 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2022 error_no_arg (_("format-control string and values to print"));
2024 s
= skip_spaces (s
);
2026 /* A format string should follow, enveloped in double quotes. */
2028 error (_("Bad format string, missing '\"'."));
2030 /* Parse the format-control string and copy it into the string STRING,
2031 processing some kinds of escape sequence. */
2033 f
= string
= (char *) alloca (strlen (s
) + 1);
2041 error (_("Bad format string, non-terminated '\"'."));
2074 /* ??? TODO: handle other escape sequences. */
2075 error (_("Unrecognized escape character \\%c in format string."),
2085 /* Skip over " and following space and comma. */
2088 s
= skip_spaces (s
);
2090 if (*s
!= ',' && *s
!= 0)
2091 error (_("Invalid argument syntax"));
2095 s
= skip_spaces (s
);
2097 /* Need extra space for the '\0's. Doubling the size is sufficient. */
2098 substrings
= alloca (strlen (string
) * 2);
2099 current_substring
= substrings
;
2102 /* Now scan the string for %-specs and see what kinds of args they want.
2103 argclass[I] classifies the %-specs so we can give printf_filtered
2104 something of the right size. */
2108 int_arg
, long_arg
, long_long_arg
, ptr_arg
,
2109 string_arg
, wide_string_arg
, wide_char_arg
,
2110 double_arg
, long_double_arg
, decfloat_arg
2112 enum argclass
*argclass
;
2113 enum argclass this_argclass
;
2118 argclass
= (enum argclass
*) alloca (strlen (s
) * sizeof *argclass
);
2125 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
2126 int seen_space
= 0, seen_plus
= 0;
2127 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
2128 int seen_big_d
= 0, seen_double_big_d
= 0;
2131 /* Check the validity of the format specifier, and work
2132 out what argument it expects. We only accept C89
2133 format strings, with the exception of long long (which
2134 we autoconf for). */
2136 /* Skip over "%%". */
2143 /* The first part of a format specifier is a set of flag
2145 while (strchr ("0-+ #", *f
))
2158 /* The next part of a format specifier is a width. */
2159 while (strchr ("0123456789", *f
))
2162 /* The next part of a format specifier is a precision. */
2167 while (strchr ("0123456789", *f
))
2171 /* The next part of a format specifier is a length modifier. */
2192 /* Decimal32 modifier. */
2198 /* Decimal64 and Decimal128 modifiers. */
2203 /* Check for a Decimal128. */
2207 seen_double_big_d
= 1;
2223 if (seen_space
|| seen_plus
)
2230 this_argclass
= int_arg
;
2231 else if (lcount
== 1)
2232 this_argclass
= long_arg
;
2234 this_argclass
= long_long_arg
;
2241 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
2242 if (lcount
> 1 || seen_h
|| seen_big_l
)
2244 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2249 this_argclass
= ptr_arg
;
2250 if (lcount
|| seen_h
|| seen_big_l
)
2252 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2257 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
2258 if (lcount
> 1 || seen_h
|| seen_big_l
)
2260 if (seen_zero
|| seen_space
|| seen_plus
)
2269 if (seen_big_h
|| seen_big_d
|| seen_double_big_d
)
2270 this_argclass
= decfloat_arg
;
2271 else if (seen_big_l
)
2272 this_argclass
= long_double_arg
;
2274 this_argclass
= double_arg
;
2276 if (lcount
|| seen_h
)
2281 error (_("`*' not supported for precision or width in printf"));
2284 error (_("Format specifier `n' not supported in printf"));
2287 error (_("Incomplete format specifier at end of format string"));
2290 error (_("Unrecognized format specifier '%c' in printf"), *f
);
2294 error (_("Inappropriate modifiers to "
2295 "format specifier '%c' in printf"),
2300 if (lcount
> 1 && USE_PRINTF_I64
)
2302 /* Windows' printf does support long long, but not the usual way.
2303 Convert %lld to %I64d. */
2304 int length_before_ll
= f
- last_arg
- 1 - lcount
;
2306 strncpy (current_substring
, last_arg
, length_before_ll
);
2307 strcpy (current_substring
+ length_before_ll
, "I64");
2308 current_substring
[length_before_ll
+ 3] =
2309 last_arg
[length_before_ll
+ lcount
];
2310 current_substring
+= length_before_ll
+ 4;
2312 else if (this_argclass
== wide_string_arg
2313 || this_argclass
== wide_char_arg
)
2315 /* Convert %ls or %lc to %s. */
2316 int length_before_ls
= f
- last_arg
- 2;
2318 strncpy (current_substring
, last_arg
, length_before_ls
);
2319 strcpy (current_substring
+ length_before_ls
, "s");
2320 current_substring
+= length_before_ls
+ 2;
2324 strncpy (current_substring
, last_arg
, f
- last_arg
);
2325 current_substring
+= f
- last_arg
;
2327 *current_substring
++ = '\0';
2329 argclass
[nargs_wanted
++] = this_argclass
;
2332 /* Now, parse all arguments and evaluate them.
2333 Store the VALUEs in VAL_ARGS. */
2339 if (nargs
== allocated_args
)
2340 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2341 (allocated_args
*= 2)
2342 * sizeof (struct value
*));
2344 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2352 if (nargs
!= nargs_wanted
)
2353 error (_("Wrong number of arguments for specified format-string"));
2355 /* Now actually print them. */
2356 current_substring
= substrings
;
2357 for (i
= 0; i
< nargs
; i
++)
2359 switch (argclass
[i
])
2367 tem
= value_as_address (val_args
[i
]);
2369 /* This is a %s argument. Find the length of the string. */
2375 read_memory (tem
+ j
, &c
, 1);
2380 /* Copy the string contents into a string inside GDB. */
2381 str
= (gdb_byte
*) alloca (j
+ 1);
2383 read_memory (tem
, str
, j
);
2386 fprintf_filtered (stream
, current_substring
, (char *) str
);
2389 case wide_string_arg
:
2394 struct gdbarch
*gdbarch
2395 = get_type_arch (value_type (val_args
[i
]));
2396 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2397 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2398 "wchar_t", NULL
, 0);
2399 int wcwidth
= TYPE_LENGTH (wctype
);
2400 gdb_byte
*buf
= alloca (wcwidth
);
2401 struct obstack output
;
2402 struct cleanup
*inner_cleanup
;
2404 tem
= value_as_address (val_args
[i
]);
2406 /* This is a %s argument. Find the length of the string. */
2407 for (j
= 0;; j
+= wcwidth
)
2410 read_memory (tem
+ j
, buf
, wcwidth
);
2411 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2415 /* Copy the string contents into a string inside GDB. */
2416 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2418 read_memory (tem
, str
, j
);
2419 memset (&str
[j
], 0, wcwidth
);
2421 obstack_init (&output
);
2422 inner_cleanup
= make_cleanup_obstack_free (&output
);
2424 convert_between_encodings (target_wide_charset (gdbarch
),
2427 &output
, translit_char
);
2428 obstack_grow_str0 (&output
, "");
2430 fprintf_filtered (stream
, current_substring
,
2431 obstack_base (&output
));
2432 do_cleanups (inner_cleanup
);
2437 struct gdbarch
*gdbarch
2438 = get_type_arch (value_type (val_args
[i
]));
2439 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2440 "wchar_t", NULL
, 0);
2441 struct type
*valtype
;
2442 struct obstack output
;
2443 struct cleanup
*inner_cleanup
;
2444 const gdb_byte
*bytes
;
2446 valtype
= value_type (val_args
[i
]);
2447 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2448 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2449 error (_("expected wchar_t argument for %%lc"));
2451 bytes
= value_contents (val_args
[i
]);
2453 obstack_init (&output
);
2454 inner_cleanup
= make_cleanup_obstack_free (&output
);
2456 convert_between_encodings (target_wide_charset (gdbarch
),
2458 bytes
, TYPE_LENGTH (valtype
),
2459 TYPE_LENGTH (valtype
),
2460 &output
, translit_char
);
2461 obstack_grow_str0 (&output
, "");
2463 fprintf_filtered (stream
, current_substring
,
2464 obstack_base (&output
));
2465 do_cleanups (inner_cleanup
);
2470 struct type
*type
= value_type (val_args
[i
]);
2474 /* If format string wants a float, unchecked-convert the value
2475 to floating point of the same size. */
2476 type
= float_type_from_length (type
);
2477 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2479 error (_("Invalid floating value found in program."));
2481 fprintf_filtered (stream
, current_substring
, (double) val
);
2484 case long_double_arg
:
2485 #ifdef HAVE_LONG_DOUBLE
2487 struct type
*type
= value_type (val_args
[i
]);
2491 /* If format string wants a float, unchecked-convert the value
2492 to floating point of the same size. */
2493 type
= float_type_from_length (type
);
2494 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2496 error (_("Invalid floating value found in program."));
2498 fprintf_filtered (stream
, current_substring
,
2503 error (_("long double not supported in printf"));
2506 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2508 long long val
= value_as_long (val_args
[i
]);
2510 fprintf_filtered (stream
, current_substring
, val
);
2514 error (_("long long not supported in printf"));
2518 int val
= value_as_long (val_args
[i
]);
2520 fprintf_filtered (stream
, current_substring
, val
);
2525 long val
= value_as_long (val_args
[i
]);
2527 fprintf_filtered (stream
, current_substring
, val
);
2531 /* Handles decimal floating values. */
2534 const gdb_byte
*param_ptr
= value_contents (val_args
[i
]);
2536 #if defined (PRINTF_HAS_DECFLOAT)
2537 /* If we have native support for Decimal floating
2538 printing, handle it here. */
2539 fprintf_filtered (stream
, current_substring
, param_ptr
);
2542 /* As a workaround until vasprintf has native support for DFP
2543 we convert the DFP values to string and print them using
2544 the %s format specifier. */
2547 int nnull_chars
= 0;
2549 /* Parameter data. */
2550 struct type
*param_type
= value_type (val_args
[i
]);
2551 unsigned int param_len
= TYPE_LENGTH (param_type
);
2552 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2553 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2555 /* DFP output data. */
2556 struct value
*dfp_value
= NULL
;
2560 struct type
*dfp_type
= NULL
;
2561 char decstr
[MAX_DECIMAL_STRING
];
2563 /* Points to the end of the string so that we can go back
2564 and check for DFP length modifiers. */
2565 eos
= current_substring
+ strlen (current_substring
);
2567 /* Look for the float/double format specifier. */
2568 while (*eos
!= 'f' && *eos
!= 'e' && *eos
!= 'E'
2569 && *eos
!= 'g' && *eos
!= 'G')
2574 /* Search for the '%' char and extract the size and type of
2575 the output decimal value based on its modifiers
2576 (%Hf, %Df, %DDf). */
2577 while (*--sos
!= '%')
2582 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2584 else if (*sos
== 'D' && *(sos
- 1) == 'D')
2587 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2593 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2597 /* Replace %Hf, %Df and %DDf with %s's. */
2600 /* Go through the whole format string and pull the correct
2601 number of chars back to compensate for the change in the
2602 format specifier. */
2603 while (nnull_chars
< nargs
- i
)
2611 /* Conversion between different DFP types. */
2612 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2613 decimal_convert (param_ptr
, param_len
, byte_order
,
2614 dec
, dfp_len
, byte_order
);
2616 /* If this is a non-trivial conversion, just output 0.
2617 A correct converted value can be displayed by explicitly
2618 casting to a DFP type. */
2619 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2621 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2623 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2625 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2627 /* Print the DFP value. */
2628 fprintf_filtered (stream
, current_substring
, decstr
);
2636 /* We avoid the host's %p because pointers are too
2637 likely to be the wrong size. The only interesting
2638 modifier for %p is a width; extract that, and then
2639 handle %p as glibc would: %#x or a literal "(nil)". */
2641 char *p
, *fmt
, *fmt_p
;
2642 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2643 long long val
= value_as_long (val_args
[i
]);
2645 long val
= value_as_long (val_args
[i
]);
2648 fmt
= alloca (strlen (current_substring
) + 5);
2650 /* Copy up to the leading %. */
2651 p
= current_substring
;
2655 int is_percent
= (*p
== '%');
2670 /* Copy any width. */
2671 while (*p
>= '0' && *p
< '9')
2674 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2677 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2683 fprintf_filtered (stream
, fmt
, val
);
2689 fprintf_filtered (stream
, fmt
, "(nil)");
2695 internal_error (__FILE__
, __LINE__
,
2696 _("failed internal consistency check"));
2698 /* Skip to the next substring. */
2699 current_substring
+= strlen (current_substring
) + 1;
2701 /* Print the portion of the format string after the last argument.
2702 Note that this will not include any ordinary %-specs, but it
2703 might include "%%". That is why we use printf_filtered and not
2704 puts_filtered here. Also, we pass a dummy argument because
2705 some platforms have modified GCC to include -Wformat-security
2706 by default, which will warn here if there is no argument. */
2707 fprintf_filtered (stream
, last_arg
, 0);
2709 do_cleanups (old_cleanups
);
2712 /* Implement the "printf" command. */
2715 printf_command (char *arg
, int from_tty
)
2717 ui_printf (arg
, gdb_stdout
);
2720 /* Implement the "eval" command. */
2723 eval_command (char *arg
, int from_tty
)
2725 struct ui_file
*ui_out
= mem_fileopen ();
2726 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2729 ui_printf (arg
, ui_out
);
2731 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2732 make_cleanup (xfree
, expanded
);
2734 execute_command (expanded
, from_tty
);
2736 do_cleanups (cleanups
);
2740 _initialize_printcmd (void)
2742 struct cmd_list_element
*c
;
2744 current_display_number
= -1;
2746 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2748 add_info ("address", address_info
,
2749 _("Describe where symbol SYM is stored."));
2751 add_info ("symbol", sym_info
, _("\
2752 Describe what symbol is at location ADDR.\n\
2753 Only for symbols with fixed locations (global or static scope)."));
2755 add_com ("x", class_vars
, x_command
, _("\
2756 Examine memory: x/FMT ADDRESS.\n\
2757 ADDRESS is an expression for the memory address to examine.\n\
2758 FMT is a repeat count followed by a format letter and a size letter.\n\
2759 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2760 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2761 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2762 The specified number of objects of the specified size are printed\n\
2763 according to the format.\n\n\
2764 Defaults for format and size letters are those previously used.\n\
2765 Default count is 1. Default address is following last thing printed\n\
2766 with this command or \"print\"."));
2769 add_com ("whereis", class_vars
, whereis_command
,
2770 _("Print line number and file of definition of variable."));
2773 add_info ("display", display_info
, _("\
2774 Expressions to display when program stops, with code numbers."));
2776 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2777 Cancel some expressions to be displayed when program stops.\n\
2778 Arguments are the code numbers of the expressions to stop displaying.\n\
2779 No argument means cancel all automatic-display expressions.\n\
2780 \"delete display\" has the same effect as this command.\n\
2781 Do \"info display\" to see current list of code numbers."),
2784 add_com ("display", class_vars
, display_command
, _("\
2785 Print value of expression EXP each time the program stops.\n\
2786 /FMT may be used before EXP as in the \"print\" command.\n\
2787 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2788 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2789 and examining is done as in the \"x\" command.\n\n\
2790 With no argument, display all currently requested auto-display expressions.\n\
2791 Use \"undisplay\" to cancel display requests previously made."));
2793 add_cmd ("display", class_vars
, enable_display_command
, _("\
2794 Enable some expressions to be displayed when program stops.\n\
2795 Arguments are the code numbers of the expressions to resume displaying.\n\
2796 No argument means enable all automatic-display expressions.\n\
2797 Do \"info display\" to see current list of code numbers."), &enablelist
);
2799 add_cmd ("display", class_vars
, disable_display_command
, _("\
2800 Disable some expressions to be displayed when program stops.\n\
2801 Arguments are the code numbers of the expressions to stop displaying.\n\
2802 No argument means disable all automatic-display expressions.\n\
2803 Do \"info display\" to see current list of code numbers."), &disablelist
);
2805 add_cmd ("display", class_vars
, undisplay_command
, _("\
2806 Cancel some expressions to be displayed when program stops.\n\
2807 Arguments are the code numbers of the expressions to stop displaying.\n\
2808 No argument means cancel all automatic-display expressions.\n\
2809 Do \"info display\" to see current list of code numbers."), &deletelist
);
2811 add_com ("printf", class_vars
, printf_command
, _("\
2812 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2813 This is useful for formatted output in user-defined commands."));
2815 add_com ("output", class_vars
, output_command
, _("\
2816 Like \"print\" but don't put in value history and don't print newline.\n\
2817 This is useful in user-defined commands."));
2819 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2820 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2821 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2822 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2823 with $), a register (a few standard names starting with $), or an actual\n\
2824 variable in the program being debugged. EXP is any valid expression.\n\
2825 Use \"set variable\" for variables with names identical to set subcommands.\n\
2827 With a subcommand, this command modifies parts of the gdb environment.\n\
2828 You can see these environment settings with the \"show\" command."),
2829 &setlist
, "set ", 1, &cmdlist
);
2831 add_com ("assign", class_vars
, set_command
, _("\
2832 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2833 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2834 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2835 with $), a register (a few standard names starting with $), or an actual\n\
2836 variable in the program being debugged. EXP is any valid expression.\n\
2837 Use \"set variable\" for variables with names identical to set subcommands.\n\
2838 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2839 You can see these environment settings with the \"show\" command."));
2841 /* "call" is the same as "set", but handy for dbx users to call fns. */
2842 c
= add_com ("call", class_vars
, call_command
, _("\
2843 Call a function in the program.\n\
2844 The argument is the function name and arguments, in the notation of the\n\
2845 current working language. The result is printed and saved in the value\n\
2846 history, if it is not void."));
2847 set_cmd_completer (c
, expression_completer
);
2849 add_cmd ("variable", class_vars
, set_command
, _("\
2850 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2851 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2852 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2853 with $), a register (a few standard names starting with $), or an actual\n\
2854 variable in the program being debugged. EXP is any valid expression.\n\
2855 This may usually be abbreviated to simply \"set\"."),
2858 c
= add_com ("print", class_vars
, print_command
, _("\
2859 Print value of expression EXP.\n\
2860 Variables accessible are those of the lexical environment of the selected\n\
2861 stack frame, plus all those whose scope is global or an entire file.\n\
2863 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2864 $$NUM refers to NUM'th value back from the last one.\n\
2865 Names starting with $ refer to registers (with the values they would have\n\
2866 if the program were to return to the stack frame now selected, restoring\n\
2867 all registers saved by frames farther in) or else to debugger\n\
2868 \"convenience\" variables (any such name not a known register).\n\
2869 Use assignment expressions to give values to convenience variables.\n\
2871 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2872 @ is a binary operator for treating consecutive data objects\n\
2873 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2874 element is FOO, whose second element is stored in the space following\n\
2875 where FOO is stored, etc. FOO must be an expression whose value\n\
2876 resides in memory.\n\
2878 EXP may be preceded with /FMT, where FMT is a format letter\n\
2879 but no count or size letter (see \"x\" command)."));
2880 set_cmd_completer (c
, expression_completer
);
2881 add_com_alias ("p", "print", class_vars
, 1);
2883 c
= add_com ("inspect", class_vars
, inspect_command
, _("\
2884 Same as \"print\" command, except that if you are running in the epoch\n\
2885 environment, the value is printed in its own window."));
2886 set_cmd_completer (c
, expression_completer
);
2888 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2889 &max_symbolic_offset
, _("\
2890 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2891 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2893 show_max_symbolic_offset
,
2894 &setprintlist
, &showprintlist
);
2895 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2896 &print_symbol_filename
, _("\
2897 Set printing of source filename and line number with <symbol>."), _("\
2898 Show printing of source filename and line number with <symbol>."), NULL
,
2900 show_print_symbol_filename
,
2901 &setprintlist
, &showprintlist
);
2903 add_com ("eval", no_class
, eval_command
, _("\
2904 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2905 a command line, and call it."));