1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
5 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
29 #include "expression.h"
33 #include "breakpoint.h"
37 #include "symfile.h" /* for overlay functions */
38 #include "objfiles.h" /* ditto */
39 #include "completer.h" /* for completion functions */
41 #include "gdb_assert.h"
46 #include "exceptions.h"
49 #include "parser-defs.h"
51 #include "arch-utils.h"
52 #include "cli/cli-utils.h"
55 #include "tui/tui.h" /* For tui_active et al. */
58 #if defined(__MINGW32__) && !defined(PRINTF_HAS_LONG_LONG)
59 # define USE_PRINTF_I64 1
60 # define PRINTF_HAS_LONG_LONG
62 # define USE_PRINTF_I64 0
65 extern int asm_demangle
; /* Whether to demangle syms in asm
74 /* True if the value should be printed raw -- that is, bypassing
75 python-based formatters. */
79 /* Last specified output format. */
81 static char last_format
= 0;
83 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
85 static char last_size
= 'w';
87 /* Default address to examine next, and associated architecture. */
89 static struct gdbarch
*next_gdbarch
;
90 static CORE_ADDR next_address
;
92 /* Number of delay instructions following current disassembled insn. */
94 static int branch_delay_insns
;
96 /* Last address examined. */
98 static CORE_ADDR last_examine_address
;
100 /* Contents of last address examined.
101 This is not valid past the end of the `x' command! */
103 static struct value
*last_examine_value
;
105 /* Largest offset between a symbolic value and an address, that will be
106 printed as `0x1234 <symbol+offset>'. */
108 static unsigned int max_symbolic_offset
= UINT_MAX
;
110 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
111 struct cmd_list_element
*c
, const char *value
)
113 fprintf_filtered (file
,
114 _("The largest offset that will be "
115 "printed in <symbol+1234> form is %s.\n"),
119 /* Append the source filename and linenumber of the symbol when
120 printing a symbolic value as `<symbol at filename:linenum>' if set. */
121 static int print_symbol_filename
= 0;
123 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
124 struct cmd_list_element
*c
, const char *value
)
126 fprintf_filtered (file
, _("Printing of source filename and "
127 "line number with <symbol> is %s.\n"),
131 /* Number of auto-display expression currently being displayed.
132 So that we can disable it if we get a signal within it.
133 -1 when not doing one. */
135 int current_display_number
;
139 /* Chain link to next auto-display item. */
140 struct display
*next
;
142 /* The expression as the user typed it. */
145 /* Expression to be evaluated and displayed. */
146 struct expression
*exp
;
148 /* Item number of this auto-display item. */
151 /* Display format specified. */
152 struct format_data format
;
154 /* Program space associated with `block'. */
155 struct program_space
*pspace
;
157 /* Innermost block required by this expression when evaluated. */
160 /* Status of this display (enabled or disabled). */
164 /* Chain of expressions whose values should be displayed
165 automatically each time the program stops. */
167 static struct display
*display_chain
;
169 static int display_number
;
171 /* Walk the following statement or block through all displays.
172 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
175 #define ALL_DISPLAYS(B) \
176 for (B = display_chain; B; B = B->next)
178 #define ALL_DISPLAYS_SAFE(B,TMP) \
179 for (B = display_chain; \
180 B ? (TMP = B->next, 1): 0; \
183 /* Prototypes for exported functions. */
185 void output_command (char *, int);
187 void _initialize_printcmd (void);
189 /* Prototypes for local functions. */
191 static void do_one_display (struct display
*);
194 /* Decode a format specification. *STRING_PTR should point to it.
195 OFORMAT and OSIZE are used as defaults for the format and size
196 if none are given in the format specification.
197 If OSIZE is zero, then the size field of the returned value
198 should be set only if a size is explicitly specified by the
200 The structure returned describes all the data
201 found in the specification. In addition, *STRING_PTR is advanced
202 past the specification and past all whitespace following it. */
204 static struct format_data
205 decode_format (char **string_ptr
, int oformat
, int osize
)
207 struct format_data val
;
208 char *p
= *string_ptr
;
215 if (*p
>= '0' && *p
<= '9')
216 val
.count
= atoi (p
);
217 while (*p
>= '0' && *p
<= '9')
220 /* Now process size or format letters that follow. */
224 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
231 else if (*p
>= 'a' && *p
<= 'z')
237 while (*p
== ' ' || *p
== '\t')
241 /* Set defaults for format and size if not specified. */
242 if (val
.format
== '?')
246 /* Neither has been specified. */
247 val
.format
= oformat
;
251 /* If a size is specified, any format makes a reasonable
252 default except 'i'. */
253 val
.format
= oformat
== 'i' ? 'x' : oformat
;
255 else if (val
.size
== '?')
259 /* Pick the appropriate size for an address. This is deferred
260 until do_examine when we know the actual architecture to use.
261 A special size value of 'a' is used to indicate this case. */
262 val
.size
= osize
? 'a' : osize
;
265 /* Floating point has to be word or giantword. */
266 if (osize
== 'w' || osize
== 'g')
269 /* Default it to giantword if the last used size is not
271 val
.size
= osize
? 'g' : osize
;
274 /* Characters default to one byte. */
275 val
.size
= osize
? 'b' : osize
;
278 /* Display strings with byte size chars unless explicitly
284 /* The default is the size most recently specified. */
291 /* Print value VAL on stream according to OPTIONS.
292 Do not end with a newline.
293 SIZE is the letter for the size of datum being printed.
294 This is used to pad hex numbers so they line up. SIZE is 0
295 for print / output and set for examine. */
298 print_formatted (struct value
*val
, int size
,
299 const struct value_print_options
*options
,
300 struct ui_file
*stream
)
302 struct type
*type
= check_typedef (value_type (val
));
303 int len
= TYPE_LENGTH (type
);
305 if (VALUE_LVAL (val
) == lval_memory
)
306 next_address
= value_address (val
) + len
;
310 switch (options
->format
)
314 struct type
*elttype
= value_type (val
);
316 next_address
= (value_address (val
)
317 + val_print_string (elttype
, NULL
,
318 value_address (val
), -1,
319 stream
, options
) * len
);
324 /* We often wrap here if there are long symbolic names. */
326 next_address
= (value_address (val
)
327 + gdb_print_insn (get_type_arch (type
),
328 value_address (val
), stream
,
329 &branch_delay_insns
));
334 if (options
->format
== 0 || options
->format
== 's'
335 || TYPE_CODE (type
) == TYPE_CODE_REF
336 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
337 || TYPE_CODE (type
) == TYPE_CODE_STRING
338 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
339 || TYPE_CODE (type
) == TYPE_CODE_UNION
340 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
341 value_print (val
, stream
, options
);
343 /* User specified format, so don't look to the type to tell us
345 val_print_scalar_formatted (type
,
346 value_contents_for_printing (val
),
347 value_embedded_offset (val
),
349 options
, size
, stream
);
352 /* Return builtin floating point type of same length as TYPE.
353 If no such type is found, return TYPE itself. */
355 float_type_from_length (struct type
*type
)
357 struct gdbarch
*gdbarch
= get_type_arch (type
);
358 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
359 unsigned int len
= TYPE_LENGTH (type
);
361 if (len
== TYPE_LENGTH (builtin
->builtin_float
))
362 type
= builtin
->builtin_float
;
363 else if (len
== TYPE_LENGTH (builtin
->builtin_double
))
364 type
= builtin
->builtin_double
;
365 else if (len
== TYPE_LENGTH (builtin
->builtin_long_double
))
366 type
= builtin
->builtin_long_double
;
371 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
372 according to OPTIONS and SIZE on STREAM. Formats s and i are not
373 supported at this level. */
376 print_scalar_formatted (const void *valaddr
, struct type
*type
,
377 const struct value_print_options
*options
,
378 int size
, struct ui_file
*stream
)
380 struct gdbarch
*gdbarch
= get_type_arch (type
);
381 LONGEST val_long
= 0;
382 unsigned int len
= TYPE_LENGTH (type
);
383 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
385 /* String printing should go through val_print_scalar_formatted. */
386 gdb_assert (options
->format
!= 's');
388 if (len
> sizeof(LONGEST
) &&
389 (TYPE_CODE (type
) == TYPE_CODE_INT
390 || TYPE_CODE (type
) == TYPE_CODE_ENUM
))
392 switch (options
->format
)
395 print_octal_chars (stream
, valaddr
, len
, byte_order
);
399 print_decimal_chars (stream
, valaddr
, len
, byte_order
);
402 print_binary_chars (stream
, valaddr
, len
, byte_order
);
405 print_hex_chars (stream
, valaddr
, len
, byte_order
);
408 print_char_chars (stream
, type
, valaddr
, len
, byte_order
);
415 if (options
->format
!= 'f')
416 val_long
= unpack_long (type
, valaddr
);
418 /* If the value is a pointer, and pointers and addresses are not the
419 same, then at this point, the value's length (in target bytes) is
420 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
421 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
422 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
424 /* If we are printing it as unsigned, truncate it in case it is actually
425 a negative signed value (e.g. "print/u (short)-1" should print 65535
426 (if shorts are 16 bits) instead of 4294967295). */
427 if (options
->format
!= 'd' || TYPE_UNSIGNED (type
))
429 if (len
< sizeof (LONGEST
))
430 val_long
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* len
) - 1;
433 switch (options
->format
)
438 /* No size specified, like in print. Print varying # of digits. */
439 print_longest (stream
, 'x', 1, val_long
);
448 print_longest (stream
, size
, 1, val_long
);
451 error (_("Undefined output size \"%c\"."), size
);
456 print_longest (stream
, 'd', 1, val_long
);
460 print_longest (stream
, 'u', 0, val_long
);
465 print_longest (stream
, 'o', 1, val_long
);
467 fprintf_filtered (stream
, "0");
472 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
474 print_address (gdbarch
, addr
, stream
);
480 struct value_print_options opts
= *options
;
483 if (TYPE_UNSIGNED (type
))
484 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
486 type
= builtin_type (gdbarch
)->builtin_true_char
;
488 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
493 type
= float_type_from_length (type
);
494 print_floating (valaddr
, type
, stream
);
498 internal_error (__FILE__
, __LINE__
,
499 _("failed internal consistency check"));
502 /* Binary; 't' stands for "two". */
504 char bits
[8 * (sizeof val_long
) + 1];
505 char buf
[8 * (sizeof val_long
) + 32];
510 width
= 8 * (sizeof val_long
);
527 error (_("Undefined output size \"%c\"."), size
);
533 bits
[width
] = (val_long
& 1) ? '1' : '0';
538 while (*cp
&& *cp
== '0')
543 strncpy (buf
, cp
, sizeof (bits
));
544 fputs_filtered (buf
, stream
);
549 error (_("Undefined output format \"%c\"."), options
->format
);
553 /* Specify default address for `x' command.
554 The `info lines' command uses this. */
557 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
559 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
561 next_gdbarch
= gdbarch
;
564 /* Make address available to the user as $_. */
565 set_internalvar (lookup_internalvar ("_"),
566 value_from_pointer (ptr_type
, addr
));
569 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
570 after LEADIN. Print nothing if no symbolic name is found nearby.
571 Optionally also print source file and line number, if available.
572 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
573 or to interpret it as a possible C++ name and convert it back to source
574 form. However note that DO_DEMANGLE can be overridden by the specific
575 settings of the demangle and asm_demangle variables. */
578 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
579 struct ui_file
*stream
,
580 int do_demangle
, char *leadin
)
583 char *filename
= NULL
;
588 /* Throw away both name and filename. */
589 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
590 make_cleanup (free_current_contents
, &filename
);
592 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
593 &filename
, &line
, &unmapped
))
595 do_cleanups (cleanup_chain
);
599 fputs_filtered (leadin
, stream
);
601 fputs_filtered ("<*", stream
);
603 fputs_filtered ("<", stream
);
604 fputs_filtered (name
, stream
);
606 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
608 /* Append source filename and line number if desired. Give specific
609 line # of this addr, if we have it; else line # of the nearest symbol. */
610 if (print_symbol_filename
&& filename
!= NULL
)
613 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
615 fprintf_filtered (stream
, " in %s", filename
);
618 fputs_filtered ("*>", stream
);
620 fputs_filtered (">", stream
);
622 do_cleanups (cleanup_chain
);
625 /* Given an address ADDR return all the elements needed to print the
626 address in a symbolic form. NAME can be mangled or not depending
627 on DO_DEMANGLE (and also on the asm_demangle global variable,
628 manipulated via ''set print asm-demangle''). Return 0 in case of
629 success, when all the info in the OUT paramters is valid. Return 1
632 build_address_symbolic (struct gdbarch
*gdbarch
,
633 CORE_ADDR addr
, /* IN */
634 int do_demangle
, /* IN */
635 char **name
, /* OUT */
636 int *offset
, /* OUT */
637 char **filename
, /* OUT */
639 int *unmapped
) /* OUT */
641 struct minimal_symbol
*msymbol
;
642 struct symbol
*symbol
;
643 CORE_ADDR name_location
= 0;
644 struct obj_section
*section
= NULL
;
645 char *name_temp
= "";
647 /* Let's say it is mapped (not unmapped). */
650 /* Determine if the address is in an overlay, and whether it is
652 if (overlay_debugging
)
654 section
= find_pc_overlay (addr
);
655 if (pc_in_unmapped_range (addr
, section
))
658 addr
= overlay_mapped_address (addr
, section
);
662 /* First try to find the address in the symbol table, then
663 in the minsyms. Take the closest one. */
665 /* This is defective in the sense that it only finds text symbols. So
666 really this is kind of pointless--we should make sure that the
667 minimal symbols have everything we need (by changing that we could
668 save some memory, but for many debug format--ELF/DWARF or
669 anything/stabs--it would be inconvenient to eliminate those minimal
671 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
672 symbol
= find_pc_sect_function (addr
, section
);
676 /* If this is a function (i.e. a code address), strip out any
677 non-address bits. For instance, display a pointer to the
678 first instruction of a Thumb function as <function>; the
679 second instruction will be <function+2>, even though the
680 pointer is <function+3>. This matches the ISA behavior. */
681 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
683 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
684 if (do_demangle
|| asm_demangle
)
685 name_temp
= SYMBOL_PRINT_NAME (symbol
);
687 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
692 if (SYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
694 /* The msymbol is closer to the address than the symbol;
695 use the msymbol instead. */
697 name_location
= SYMBOL_VALUE_ADDRESS (msymbol
);
698 if (do_demangle
|| asm_demangle
)
699 name_temp
= SYMBOL_PRINT_NAME (msymbol
);
701 name_temp
= SYMBOL_LINKAGE_NAME (msymbol
);
704 if (symbol
== NULL
&& msymbol
== NULL
)
707 /* If the nearest symbol is too far away, don't print anything symbolic. */
709 /* For when CORE_ADDR is larger than unsigned int, we do math in
710 CORE_ADDR. But when we detect unsigned wraparound in the
711 CORE_ADDR math, we ignore this test and print the offset,
712 because addr+max_symbolic_offset has wrapped through the end
713 of the address space back to the beginning, giving bogus comparison. */
714 if (addr
> name_location
+ max_symbolic_offset
715 && name_location
+ max_symbolic_offset
> name_location
)
718 *offset
= addr
- name_location
;
720 *name
= xstrdup (name_temp
);
722 if (print_symbol_filename
)
724 struct symtab_and_line sal
;
726 sal
= find_pc_sect_line (addr
, section
, 0);
730 *filename
= xstrdup (sal
.symtab
->filename
);
738 /* Print address ADDR symbolically on STREAM.
739 First print it as a number. Then perhaps print
740 <SYMBOL + OFFSET> after the number. */
743 print_address (struct gdbarch
*gdbarch
,
744 CORE_ADDR addr
, struct ui_file
*stream
)
746 fputs_filtered (paddress (gdbarch
, addr
), stream
);
747 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
750 /* Return a prefix for instruction address:
751 "=> " for current instruction, else " ". */
754 pc_prefix (CORE_ADDR addr
)
756 if (has_stack_frames ())
758 struct frame_info
*frame
;
761 frame
= get_selected_frame (NULL
);
762 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
768 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
769 controls whether to print the symbolic name "raw" or demangled.
770 Global setting "addressprint" controls whether to print hex address
774 print_address_demangle (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
775 struct ui_file
*stream
, int do_demangle
)
777 struct value_print_options opts
;
779 get_user_print_options (&opts
);
782 fprintf_filtered (stream
, "0");
784 else if (opts
.addressprint
)
786 fputs_filtered (paddress (gdbarch
, addr
), stream
);
787 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
791 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
796 /* Examine data at address ADDR in format FMT.
797 Fetch it from memory and print on gdb_stdout. */
800 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
805 struct type
*val_type
= NULL
;
808 struct value_print_options opts
;
813 next_gdbarch
= gdbarch
;
816 /* Instruction format implies fetch single bytes
817 regardless of the specified size.
818 The case of strings is handled in decode_format, only explicit
819 size operator are not changed to 'b'. */
825 /* Pick the appropriate size for an address. */
826 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
828 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
830 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
833 /* Bad value for gdbarch_ptr_bit. */
834 internal_error (__FILE__
, __LINE__
,
835 _("failed internal consistency check"));
839 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
840 else if (size
== 'h')
841 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
842 else if (size
== 'w')
843 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
844 else if (size
== 'g')
845 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
849 struct type
*char_type
= NULL
;
851 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
852 if type is not found. */
854 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
855 else if (size
== 'w')
856 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
858 val_type
= char_type
;
861 if (size
!= '\0' && size
!= 'b')
862 warning (_("Unable to display strings with "
863 "size '%c', using 'b' instead."), size
);
865 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
874 if (format
== 's' || format
== 'i')
877 get_formatted_print_options (&opts
, format
);
879 /* Print as many objects as specified in COUNT, at most maxelts per line,
880 with the address of the next one at the start of each line. */
886 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
887 print_address (next_gdbarch
, next_address
, gdb_stdout
);
888 printf_filtered (":");
893 printf_filtered ("\t");
894 /* Note that print_formatted sets next_address for the next
896 last_examine_address
= next_address
;
898 if (last_examine_value
)
899 value_free (last_examine_value
);
901 /* The value to be displayed is not fetched greedily.
902 Instead, to avoid the possibility of a fetched value not
903 being used, its retrieval is delayed until the print code
904 uses it. When examining an instruction stream, the
905 disassembler will perform its own memory fetch using just
906 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
907 the disassembler be modified so that LAST_EXAMINE_VALUE
908 is left with the byte sequence from the last complete
909 instruction fetched from memory? */
910 last_examine_value
= value_at_lazy (val_type
, next_address
);
912 if (last_examine_value
)
913 release_value (last_examine_value
);
915 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
917 /* Display any branch delay slots following the final insn. */
918 if (format
== 'i' && count
== 1)
919 count
+= branch_delay_insns
;
921 printf_filtered ("\n");
922 gdb_flush (gdb_stdout
);
927 validate_format (struct format_data fmt
, char *cmdname
)
930 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
932 error (_("Item count other than 1 is meaningless in \"%s\" command."),
934 if (fmt
.format
== 'i')
935 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
936 fmt
.format
, cmdname
);
939 /* Evaluate string EXP as an expression in the current language and
940 print the resulting value. EXP may contain a format specifier as the
941 first argument ("/x myvar" for example, to print myvar in hex). */
944 print_command_1 (char *exp
, int inspect
, int voidprint
)
946 struct expression
*expr
;
947 struct cleanup
*old_chain
= 0;
950 struct format_data fmt
;
953 if (exp
&& *exp
== '/')
956 fmt
= decode_format (&exp
, last_format
, 0);
957 validate_format (fmt
, "print");
958 last_format
= format
= fmt
.format
;
970 expr
= parse_expression (exp
);
971 old_chain
= make_cleanup (free_current_contents
, &expr
);
973 val
= evaluate_expression (expr
);
976 val
= access_value_history (0);
978 if (voidprint
|| (val
&& value_type (val
) &&
979 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
981 struct value_print_options opts
;
982 int histindex
= record_latest_value (val
);
985 annotate_value_history_begin (histindex
, value_type (val
));
987 annotate_value_begin (value_type (val
));
990 printf_unfiltered ("\031(gdb-makebuffer \"%s\" %d '(\"",
992 else if (histindex
>= 0)
993 printf_filtered ("$%d = ", histindex
);
996 annotate_value_history_value ();
998 get_formatted_print_options (&opts
, format
);
999 opts
.inspect_it
= inspect
;
1002 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1003 printf_filtered ("\n");
1006 annotate_value_history_end ();
1008 annotate_value_end ();
1011 printf_unfiltered ("\") )\030");
1015 do_cleanups (old_chain
);
1019 print_command (char *exp
, int from_tty
)
1021 print_command_1 (exp
, 0, 1);
1024 /* Same as print, except in epoch, it gets its own window. */
1026 inspect_command (char *exp
, int from_tty
)
1028 extern int epoch_interface
;
1030 print_command_1 (exp
, epoch_interface
, 1);
1033 /* Same as print, except it doesn't print void results. */
1035 call_command (char *exp
, int from_tty
)
1037 print_command_1 (exp
, 0, 0);
1041 output_command (char *exp
, int from_tty
)
1043 struct expression
*expr
;
1044 struct cleanup
*old_chain
;
1047 struct format_data fmt
;
1048 struct value_print_options opts
;
1053 if (exp
&& *exp
== '/')
1056 fmt
= decode_format (&exp
, 0, 0);
1057 validate_format (fmt
, "output");
1058 format
= fmt
.format
;
1061 expr
= parse_expression (exp
);
1062 old_chain
= make_cleanup (free_current_contents
, &expr
);
1064 val
= evaluate_expression (expr
);
1066 annotate_value_begin (value_type (val
));
1068 get_formatted_print_options (&opts
, format
);
1070 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1072 annotate_value_end ();
1075 gdb_flush (gdb_stdout
);
1077 do_cleanups (old_chain
);
1081 set_command (char *exp
, int from_tty
)
1083 struct expression
*expr
= parse_expression (exp
);
1084 struct cleanup
*old_chain
=
1085 make_cleanup (free_current_contents
, &expr
);
1087 evaluate_expression (expr
);
1088 do_cleanups (old_chain
);
1092 sym_info (char *arg
, int from_tty
)
1094 struct minimal_symbol
*msymbol
;
1095 struct objfile
*objfile
;
1096 struct obj_section
*osect
;
1097 CORE_ADDR addr
, sect_addr
;
1099 unsigned int offset
;
1102 error_no_arg (_("address"));
1104 addr
= parse_and_eval_address (arg
);
1105 ALL_OBJSECTIONS (objfile
, osect
)
1107 /* Only process each object file once, even if there's a separate
1109 if (objfile
->separate_debug_objfile_backlink
)
1112 sect_addr
= overlay_mapped_address (addr
, osect
);
1114 if (obj_section_addr (osect
) <= sect_addr
1115 && sect_addr
< obj_section_endaddr (osect
)
1116 && (msymbol
= lookup_minimal_symbol_by_pc_section (sect_addr
, osect
)))
1118 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1120 struct cleanup
*old_chain
;
1123 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1124 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1125 sec_name
= osect
->the_bfd_section
->name
;
1126 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1128 /* Don't print the offset if it is zero.
1129 We assume there's no need to handle i18n of "sym + offset". */
1131 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1133 loc_string
= xstrprintf ("%s", msym_name
);
1135 /* Use a cleanup to free loc_string in case the user quits
1136 a pagination request inside printf_filtered. */
1137 old_chain
= make_cleanup (xfree
, loc_string
);
1139 gdb_assert (osect
->objfile
&& osect
->objfile
->name
);
1140 obj_name
= osect
->objfile
->name
;
1142 if (MULTI_OBJFILE_P ())
1143 if (pc_in_unmapped_range (addr
, osect
))
1144 if (section_is_overlay (osect
))
1145 printf_filtered (_("%s in load address range of "
1146 "%s overlay section %s of %s\n"),
1147 loc_string
, mapped
, sec_name
, obj_name
);
1149 printf_filtered (_("%s in load address range of "
1150 "section %s of %s\n"),
1151 loc_string
, sec_name
, obj_name
);
1153 if (section_is_overlay (osect
))
1154 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1155 loc_string
, mapped
, sec_name
, obj_name
);
1157 printf_filtered (_("%s in section %s of %s\n"),
1158 loc_string
, sec_name
, obj_name
);
1160 if (pc_in_unmapped_range (addr
, osect
))
1161 if (section_is_overlay (osect
))
1162 printf_filtered (_("%s in load address range of %s overlay "
1164 loc_string
, mapped
, sec_name
);
1166 printf_filtered (_("%s in load address range of section %s\n"),
1167 loc_string
, sec_name
);
1169 if (section_is_overlay (osect
))
1170 printf_filtered (_("%s in %s overlay section %s\n"),
1171 loc_string
, mapped
, sec_name
);
1173 printf_filtered (_("%s in section %s\n"),
1174 loc_string
, sec_name
);
1176 do_cleanups (old_chain
);
1180 printf_filtered (_("No symbol matches %s.\n"), arg
);
1184 address_info (char *exp
, int from_tty
)
1186 struct gdbarch
*gdbarch
;
1189 struct minimal_symbol
*msymbol
;
1191 struct obj_section
*section
;
1192 CORE_ADDR load_addr
, context_pc
= 0;
1193 int is_a_field_of_this
; /* C++: lookup_symbol sets this to nonzero
1194 if exp is a field of `this'. */
1197 error (_("Argument required."));
1199 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1200 &is_a_field_of_this
);
1203 if (is_a_field_of_this
)
1205 printf_filtered ("Symbol \"");
1206 fprintf_symbol_filtered (gdb_stdout
, exp
,
1207 current_language
->la_language
, DMGL_ANSI
);
1208 printf_filtered ("\" is a field of the local class variable ");
1209 if (current_language
->la_language
== language_objc
)
1210 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1212 printf_filtered ("`this'\n");
1216 msymbol
= lookup_minimal_symbol (exp
, NULL
, NULL
);
1218 if (msymbol
!= NULL
)
1220 gdbarch
= get_objfile_arch (msymbol_objfile (msymbol
));
1221 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1223 printf_filtered ("Symbol \"");
1224 fprintf_symbol_filtered (gdb_stdout
, exp
,
1225 current_language
->la_language
, DMGL_ANSI
);
1226 printf_filtered ("\" is at ");
1227 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1228 printf_filtered (" in a file compiled without debugging");
1229 section
= SYMBOL_OBJ_SECTION (msymbol
);
1230 if (section_is_overlay (section
))
1232 load_addr
= overlay_unmapped_address (load_addr
, section
);
1233 printf_filtered (",\n -- loaded at ");
1234 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1235 printf_filtered (" in overlay section %s",
1236 section
->the_bfd_section
->name
);
1238 printf_filtered (".\n");
1241 error (_("No symbol \"%s\" in current context."), exp
);
1245 printf_filtered ("Symbol \"");
1246 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1247 current_language
->la_language
, DMGL_ANSI
);
1248 printf_filtered ("\" is ");
1249 val
= SYMBOL_VALUE (sym
);
1250 section
= SYMBOL_OBJ_SECTION (sym
);
1251 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1253 switch (SYMBOL_CLASS (sym
))
1256 case LOC_CONST_BYTES
:
1257 printf_filtered ("constant");
1261 printf_filtered ("a label at address ");
1262 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1263 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1264 if (section_is_overlay (section
))
1266 load_addr
= overlay_unmapped_address (load_addr
, section
);
1267 printf_filtered (",\n -- loaded at ");
1268 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1269 printf_filtered (" in overlay section %s",
1270 section
->the_bfd_section
->name
);
1275 /* FIXME: cagney/2004-01-26: It should be possible to
1276 unconditionally call the SYMBOL_COMPUTED_OPS method when available.
1277 Unfortunately DWARF 2 stores the frame-base (instead of the
1278 function) location in a function's symbol. Oops! For the
1279 moment enable this when/where applicable. */
1280 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1285 /* GDBARCH is the architecture associated with the objfile the symbol
1286 is defined in; the target architecture may be different, and may
1287 provide additional registers. However, we do not know the target
1288 architecture at this point. We assume the objfile architecture
1289 will contain all the standard registers that occur in debug info
1291 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1293 if (SYMBOL_IS_ARGUMENT (sym
))
1294 printf_filtered (_("an argument in register %s"),
1295 gdbarch_register_name (gdbarch
, regno
));
1297 printf_filtered (_("a variable in register %s"),
1298 gdbarch_register_name (gdbarch
, regno
));
1302 printf_filtered (_("static storage at address "));
1303 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1304 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1305 if (section_is_overlay (section
))
1307 load_addr
= overlay_unmapped_address (load_addr
, section
);
1308 printf_filtered (_(",\n -- loaded at "));
1309 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1310 printf_filtered (_(" in overlay section %s"),
1311 section
->the_bfd_section
->name
);
1315 case LOC_REGPARM_ADDR
:
1316 /* Note comment at LOC_REGISTER. */
1317 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1318 printf_filtered (_("address of an argument in register %s"),
1319 gdbarch_register_name (gdbarch
, regno
));
1323 printf_filtered (_("an argument at offset %ld"), val
);
1327 printf_filtered (_("a local variable at frame offset %ld"), val
);
1331 printf_filtered (_("a reference argument at offset %ld"), val
);
1335 printf_filtered (_("a typedef"));
1339 printf_filtered (_("a function at address "));
1340 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1341 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1342 if (section_is_overlay (section
))
1344 load_addr
= overlay_unmapped_address (load_addr
, section
);
1345 printf_filtered (_(",\n -- loaded at "));
1346 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1347 printf_filtered (_(" in overlay section %s"),
1348 section
->the_bfd_section
->name
);
1352 case LOC_UNRESOLVED
:
1354 struct minimal_symbol
*msym
;
1356 msym
= lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (sym
), NULL
, NULL
);
1358 printf_filtered ("unresolved");
1361 section
= SYMBOL_OBJ_SECTION (msym
);
1362 load_addr
= SYMBOL_VALUE_ADDRESS (msym
);
1365 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1366 printf_filtered (_("a thread-local variable at offset %s "
1367 "in the thread-local storage for `%s'"),
1368 paddress (gdbarch
, load_addr
),
1369 section
->objfile
->name
);
1372 printf_filtered (_("static storage at address "));
1373 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1374 if (section_is_overlay (section
))
1376 load_addr
= overlay_unmapped_address (load_addr
, section
);
1377 printf_filtered (_(",\n -- loaded at "));
1378 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1379 printf_filtered (_(" in overlay section %s"),
1380 section
->the_bfd_section
->name
);
1387 case LOC_OPTIMIZED_OUT
:
1388 printf_filtered (_("optimized out"));
1392 printf_filtered (_("of unknown (botched) type"));
1395 printf_filtered (".\n");
1400 x_command (char *exp
, int from_tty
)
1402 struct expression
*expr
;
1403 struct format_data fmt
;
1404 struct cleanup
*old_chain
;
1407 fmt
.format
= last_format
? last_format
: 'x';
1408 fmt
.size
= last_size
;
1412 if (exp
&& *exp
== '/')
1415 fmt
= decode_format (&exp
, last_format
, last_size
);
1418 /* If we have an expression, evaluate it and use it as the address. */
1420 if (exp
!= 0 && *exp
!= 0)
1422 expr
= parse_expression (exp
);
1423 /* Cause expression not to be there any more if this command is
1424 repeated with Newline. But don't clobber a user-defined
1425 command's definition. */
1428 old_chain
= make_cleanup (free_current_contents
, &expr
);
1429 val
= evaluate_expression (expr
);
1430 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1431 val
= coerce_ref (val
);
1432 /* In rvalue contexts, such as this, functions are coerced into
1433 pointers to functions. This makes "x/i main" work. */
1434 if (/* last_format == 'i' && */
1435 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1436 && VALUE_LVAL (val
) == lval_memory
)
1437 next_address
= value_address (val
);
1439 next_address
= value_as_address (val
);
1441 next_gdbarch
= expr
->gdbarch
;
1442 do_cleanups (old_chain
);
1446 error_no_arg (_("starting display address"));
1448 do_examine (fmt
, next_gdbarch
, next_address
);
1450 /* If the examine succeeds, we remember its size and format for next
1451 time. Set last_size to 'b' for strings. */
1452 if (fmt
.format
== 's')
1455 last_size
= fmt
.size
;
1456 last_format
= fmt
.format
;
1458 /* Set a couple of internal variables if appropriate. */
1459 if (last_examine_value
)
1461 /* Make last address examined available to the user as $_. Use
1462 the correct pointer type. */
1463 struct type
*pointer_type
1464 = lookup_pointer_type (value_type (last_examine_value
));
1465 set_internalvar (lookup_internalvar ("_"),
1466 value_from_pointer (pointer_type
,
1467 last_examine_address
));
1469 /* Make contents of last address examined available to the user
1470 as $__. If the last value has not been fetched from memory
1471 then don't fetch it now; instead mark it by voiding the $__
1473 if (value_lazy (last_examine_value
))
1474 clear_internalvar (lookup_internalvar ("__"));
1476 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1481 /* Add an expression to the auto-display chain.
1482 Specify the expression. */
1485 display_command (char *exp
, int from_tty
)
1487 struct format_data fmt
;
1488 struct expression
*expr
;
1489 struct display
*new;
1493 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1495 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1496 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1510 fmt
= decode_format (&exp
, 0, 0);
1511 if (fmt
.size
&& fmt
.format
== 0)
1513 if (fmt
.format
== 'i' || fmt
.format
== 's')
1524 innermost_block
= NULL
;
1525 expr
= parse_expression (exp
);
1527 new = (struct display
*) xmalloc (sizeof (struct display
));
1529 new->exp_string
= xstrdup (exp
);
1531 new->block
= innermost_block
;
1532 new->pspace
= current_program_space
;
1533 new->next
= display_chain
;
1534 new->number
= ++display_number
;
1537 display_chain
= new;
1539 if (from_tty
&& target_has_execution
)
1540 do_one_display (new);
1547 free_display (struct display
*d
)
1549 xfree (d
->exp_string
);
1554 /* Clear out the display_chain. Done when new symtabs are loaded,
1555 since this invalidates the types stored in many expressions. */
1558 clear_displays (void)
1562 while ((d
= display_chain
) != NULL
)
1564 display_chain
= d
->next
;
1569 /* Delete the auto-display DISPLAY. */
1572 delete_display (struct display
*display
)
1576 gdb_assert (display
!= NULL
);
1578 if (display_chain
== display
)
1579 display_chain
= display
->next
;
1582 if (d
->next
== display
)
1584 d
->next
= display
->next
;
1588 free_display (display
);
1591 /* Call FUNCTION on each of the displays whose numbers are given in
1592 ARGS. DATA is passed unmodified to FUNCTION. */
1595 map_display_numbers (char *args
,
1596 void (*function
) (struct display
*,
1600 struct get_number_or_range_state state
;
1601 struct display
*b
, *tmp
;
1605 error_no_arg (_("one or more display numbers"));
1607 init_number_or_range (&state
, args
);
1609 while (!state
.finished
)
1611 char *p
= state
.string
;
1613 num
= get_number_or_range (&state
);
1615 warning (_("bad display number at or near '%s'"), p
);
1618 struct display
*d
, *tmp
;
1620 ALL_DISPLAYS_SAFE (d
, tmp
)
1621 if (d
->number
== num
)
1624 printf_unfiltered (_("No display number %d.\n"), num
);
1631 /* Callback for map_display_numbers, that deletes a display. */
1634 do_delete_display (struct display
*d
, void *data
)
1639 /* "undisplay" command. */
1642 undisplay_command (char *args
, int from_tty
)
1645 struct get_number_or_range_state state
;
1649 if (query (_("Delete all auto-display expressions? ")))
1655 map_display_numbers (args
, do_delete_display
, NULL
);
1659 /* Display a single auto-display.
1660 Do nothing if the display cannot be printed in the current context,
1661 or if the display is disabled. */
1664 do_one_display (struct display
*d
)
1666 struct cleanup
*old_chain
;
1667 int within_current_scope
;
1669 if (d
->enabled_p
== 0)
1672 /* The expression carries the architecture that was used at parse time.
1673 This is a problem if the expression depends on architecture features
1674 (e.g. register numbers), and the current architecture is now different.
1675 For example, a display statement like "display/i $pc" is expected to
1676 display the PC register of the current architecture, not the arch at
1677 the time the display command was given. Therefore, we re-parse the
1678 expression if the current architecture has changed. */
1679 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1688 volatile struct gdb_exception ex
;
1690 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1692 innermost_block
= NULL
;
1693 d
->exp
= parse_expression (d
->exp_string
);
1694 d
->block
= innermost_block
;
1698 /* Can't re-parse the expression. Disable this display item. */
1700 warning (_("Unable to display \"%s\": %s"),
1701 d
->exp_string
, ex
.message
);
1708 if (d
->pspace
== current_program_space
)
1709 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1711 within_current_scope
= 0;
1714 within_current_scope
= 1;
1715 if (!within_current_scope
)
1718 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1719 current_display_number
= d
->number
;
1721 annotate_display_begin ();
1722 printf_filtered ("%d", d
->number
);
1723 annotate_display_number_end ();
1724 printf_filtered (": ");
1727 volatile struct gdb_exception ex
;
1729 annotate_display_format ();
1731 printf_filtered ("x/");
1732 if (d
->format
.count
!= 1)
1733 printf_filtered ("%d", d
->format
.count
);
1734 printf_filtered ("%c", d
->format
.format
);
1735 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1736 printf_filtered ("%c", d
->format
.size
);
1737 printf_filtered (" ");
1739 annotate_display_expression ();
1741 puts_filtered (d
->exp_string
);
1742 annotate_display_expression_end ();
1744 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1745 printf_filtered ("\n");
1747 printf_filtered (" ");
1749 annotate_display_value ();
1751 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1756 val
= evaluate_expression (d
->exp
);
1757 addr
= value_as_address (val
);
1758 if (d
->format
.format
== 'i')
1759 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1760 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1763 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1767 struct value_print_options opts
;
1768 volatile struct gdb_exception ex
;
1770 annotate_display_format ();
1772 if (d
->format
.format
)
1773 printf_filtered ("/%c ", d
->format
.format
);
1775 annotate_display_expression ();
1777 puts_filtered (d
->exp_string
);
1778 annotate_display_expression_end ();
1780 printf_filtered (" = ");
1782 annotate_display_expression ();
1784 get_formatted_print_options (&opts
, d
->format
.format
);
1785 opts
.raw
= d
->format
.raw
;
1787 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1791 val
= evaluate_expression (d
->exp
);
1792 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1795 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1796 printf_filtered ("\n");
1799 annotate_display_end ();
1801 gdb_flush (gdb_stdout
);
1802 do_cleanups (old_chain
);
1805 /* Display all of the values on the auto-display chain which can be
1806 evaluated in the current scope. */
1813 for (d
= display_chain
; d
; d
= d
->next
)
1817 /* Delete the auto-display which we were in the process of displaying.
1818 This is done when there is an error or a signal. */
1821 disable_display (int num
)
1825 for (d
= display_chain
; d
; d
= d
->next
)
1826 if (d
->number
== num
)
1831 printf_unfiltered (_("No display number %d.\n"), num
);
1835 disable_current_display (void)
1837 if (current_display_number
>= 0)
1839 disable_display (current_display_number
);
1840 fprintf_unfiltered (gdb_stderr
,
1841 _("Disabling display %d to "
1842 "avoid infinite recursion.\n"),
1843 current_display_number
);
1845 current_display_number
= -1;
1849 display_info (char *ignore
, int from_tty
)
1854 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1856 printf_filtered (_("Auto-display expressions now in effect:\n\
1857 Num Enb Expression\n"));
1859 for (d
= display_chain
; d
; d
= d
->next
)
1861 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1863 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1865 else if (d
->format
.format
)
1866 printf_filtered ("/%c ", d
->format
.format
);
1867 puts_filtered (d
->exp_string
);
1868 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1869 printf_filtered (_(" (cannot be evaluated in the current context)"));
1870 printf_filtered ("\n");
1871 gdb_flush (gdb_stdout
);
1875 /* Callback fo map_display_numbers, that enables or disables the
1876 passed in display D. */
1879 do_enable_disable_display (struct display
*d
, void *data
)
1881 d
->enabled_p
= *(int *) data
;
1884 /* Implamentation of both the "disable display" and "enable display"
1885 commands. ENABLE decides what to do. */
1888 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1895 d
->enabled_p
= enable
;
1899 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1902 /* The "enable display" command. */
1905 enable_display_command (char *args
, int from_tty
)
1907 enable_disable_display_command (args
, from_tty
, 1);
1910 /* The "disable display" command. */
1913 disable_display_command (char *args
, int from_tty
)
1915 enable_disable_display_command (args
, from_tty
, 0);
1918 /* display_chain items point to blocks and expressions. Some expressions in
1919 turn may point to symbols.
1920 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1921 obstack_free'd when a shared library is unloaded.
1922 Clear pointers that are about to become dangling.
1923 Both .exp and .block fields will be restored next time we need to display
1924 an item by re-parsing .exp_string field in the new execution context. */
1927 clear_dangling_display_expressions (struct so_list
*solib
)
1929 struct objfile
*objfile
= solib
->objfile
;
1932 /* With no symbol file we cannot have a block or expression from it. */
1933 if (objfile
== NULL
)
1935 if (objfile
->separate_debug_objfile_backlink
)
1936 objfile
= objfile
->separate_debug_objfile_backlink
;
1937 gdb_assert (objfile
->pspace
== solib
->pspace
);
1939 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1941 if (d
->pspace
!= solib
->pspace
)
1944 if (lookup_objfile_from_block (d
->block
) == objfile
1945 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1955 /* Print the value in stack frame FRAME of a variable specified by a
1956 struct symbol. NAME is the name to print; if NULL then VAR's print
1957 name will be used. STREAM is the ui_file on which to print the
1958 value. INDENT specifies the number of indent levels to print
1959 before printing the variable name. */
1962 print_variable_and_value (const char *name
, struct symbol
*var
,
1963 struct frame_info
*frame
,
1964 struct ui_file
*stream
, int indent
)
1966 volatile struct gdb_exception except
;
1969 name
= SYMBOL_PRINT_NAME (var
);
1971 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1972 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1975 struct value_print_options opts
;
1977 val
= read_var_value (var
, frame
);
1978 get_user_print_options (&opts
);
1980 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1982 if (except
.reason
< 0)
1983 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
1985 fprintf_filtered (stream
, "\n");
1988 /* printf "printf format string" ARG to STREAM. */
1991 ui_printf (char *arg
, struct ui_file
*stream
)
1995 char *string
= NULL
;
1996 struct value
**val_args
;
1998 char *current_substring
;
2000 int allocated_args
= 20;
2001 struct cleanup
*old_cleanups
;
2003 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2004 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2007 error_no_arg (_("format-control string and values to print"));
2009 s
= skip_spaces (s
);
2011 /* A format string should follow, enveloped in double quotes. */
2013 error (_("Bad format string, missing '\"'."));
2015 /* Parse the format-control string and copy it into the string STRING,
2016 processing some kinds of escape sequence. */
2018 f
= string
= (char *) alloca (strlen (s
) + 1);
2026 error (_("Bad format string, non-terminated '\"'."));
2059 /* ??? TODO: handle other escape sequences. */
2060 error (_("Unrecognized escape character \\%c in format string."),
2070 /* Skip over " and following space and comma. */
2073 s
= skip_spaces (s
);
2075 if (*s
!= ',' && *s
!= 0)
2076 error (_("Invalid argument syntax"));
2080 s
= skip_spaces (s
);
2082 /* Need extra space for the '\0's. Doubling the size is sufficient. */
2083 substrings
= alloca (strlen (string
) * 2);
2084 current_substring
= substrings
;
2087 /* Now scan the string for %-specs and see what kinds of args they want.
2088 argclass[I] classifies the %-specs so we can give printf_filtered
2089 something of the right size. */
2093 int_arg
, long_arg
, long_long_arg
, ptr_arg
,
2094 string_arg
, wide_string_arg
, wide_char_arg
,
2095 double_arg
, long_double_arg
, decfloat_arg
2097 enum argclass
*argclass
;
2098 enum argclass this_argclass
;
2103 argclass
= (enum argclass
*) alloca (strlen (s
) * sizeof *argclass
);
2110 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
2111 int seen_space
= 0, seen_plus
= 0;
2112 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
2113 int seen_big_d
= 0, seen_double_big_d
= 0;
2116 /* Check the validity of the format specifier, and work
2117 out what argument it expects. We only accept C89
2118 format strings, with the exception of long long (which
2119 we autoconf for). */
2121 /* Skip over "%%". */
2128 /* The first part of a format specifier is a set of flag
2130 while (strchr ("0-+ #", *f
))
2143 /* The next part of a format specifier is a width. */
2144 while (strchr ("0123456789", *f
))
2147 /* The next part of a format specifier is a precision. */
2152 while (strchr ("0123456789", *f
))
2156 /* The next part of a format specifier is a length modifier. */
2177 /* Decimal32 modifier. */
2183 /* Decimal64 and Decimal128 modifiers. */
2188 /* Check for a Decimal128. */
2192 seen_double_big_d
= 1;
2208 if (seen_space
|| seen_plus
)
2215 this_argclass
= int_arg
;
2216 else if (lcount
== 1)
2217 this_argclass
= long_arg
;
2219 this_argclass
= long_long_arg
;
2226 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
2227 if (lcount
> 1 || seen_h
|| seen_big_l
)
2229 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2234 this_argclass
= ptr_arg
;
2235 if (lcount
|| seen_h
|| seen_big_l
)
2237 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2242 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
2243 if (lcount
> 1 || seen_h
|| seen_big_l
)
2245 if (seen_zero
|| seen_space
|| seen_plus
)
2254 if (seen_big_h
|| seen_big_d
|| seen_double_big_d
)
2255 this_argclass
= decfloat_arg
;
2256 else if (seen_big_l
)
2257 this_argclass
= long_double_arg
;
2259 this_argclass
= double_arg
;
2261 if (lcount
|| seen_h
)
2266 error (_("`*' not supported for precision or width in printf"));
2269 error (_("Format specifier `n' not supported in printf"));
2272 error (_("Incomplete format specifier at end of format string"));
2275 error (_("Unrecognized format specifier '%c' in printf"), *f
);
2279 error (_("Inappropriate modifiers to "
2280 "format specifier '%c' in printf"),
2285 if (lcount
> 1 && USE_PRINTF_I64
)
2287 /* Windows' printf does support long long, but not the usual way.
2288 Convert %lld to %I64d. */
2289 int length_before_ll
= f
- last_arg
- 1 - lcount
;
2291 strncpy (current_substring
, last_arg
, length_before_ll
);
2292 strcpy (current_substring
+ length_before_ll
, "I64");
2293 current_substring
[length_before_ll
+ 3] =
2294 last_arg
[length_before_ll
+ lcount
];
2295 current_substring
+= length_before_ll
+ 4;
2297 else if (this_argclass
== wide_string_arg
2298 || this_argclass
== wide_char_arg
)
2300 /* Convert %ls or %lc to %s. */
2301 int length_before_ls
= f
- last_arg
- 2;
2303 strncpy (current_substring
, last_arg
, length_before_ls
);
2304 strcpy (current_substring
+ length_before_ls
, "s");
2305 current_substring
+= length_before_ls
+ 2;
2309 strncpy (current_substring
, last_arg
, f
- last_arg
);
2310 current_substring
+= f
- last_arg
;
2312 *current_substring
++ = '\0';
2314 argclass
[nargs_wanted
++] = this_argclass
;
2317 /* Now, parse all arguments and evaluate them.
2318 Store the VALUEs in VAL_ARGS. */
2324 if (nargs
== allocated_args
)
2325 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2326 (allocated_args
*= 2)
2327 * sizeof (struct value
*));
2329 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2337 if (nargs
!= nargs_wanted
)
2338 error (_("Wrong number of arguments for specified format-string"));
2340 /* Now actually print them. */
2341 current_substring
= substrings
;
2342 for (i
= 0; i
< nargs
; i
++)
2344 switch (argclass
[i
])
2352 tem
= value_as_address (val_args
[i
]);
2354 /* This is a %s argument. Find the length of the string. */
2360 read_memory (tem
+ j
, &c
, 1);
2365 /* Copy the string contents into a string inside GDB. */
2366 str
= (gdb_byte
*) alloca (j
+ 1);
2368 read_memory (tem
, str
, j
);
2371 fprintf_filtered (stream
, current_substring
, (char *) str
);
2374 case wide_string_arg
:
2379 struct gdbarch
*gdbarch
2380 = get_type_arch (value_type (val_args
[i
]));
2381 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2382 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2383 "wchar_t", NULL
, 0);
2384 int wcwidth
= TYPE_LENGTH (wctype
);
2385 gdb_byte
*buf
= alloca (wcwidth
);
2386 struct obstack output
;
2387 struct cleanup
*inner_cleanup
;
2389 tem
= value_as_address (val_args
[i
]);
2391 /* This is a %s argument. Find the length of the string. */
2392 for (j
= 0;; j
+= wcwidth
)
2395 read_memory (tem
+ j
, buf
, wcwidth
);
2396 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2400 /* Copy the string contents into a string inside GDB. */
2401 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2403 read_memory (tem
, str
, j
);
2404 memset (&str
[j
], 0, wcwidth
);
2406 obstack_init (&output
);
2407 inner_cleanup
= make_cleanup_obstack_free (&output
);
2409 convert_between_encodings (target_wide_charset (gdbarch
),
2412 &output
, translit_char
);
2413 obstack_grow_str0 (&output
, "");
2415 fprintf_filtered (stream
, current_substring
,
2416 obstack_base (&output
));
2417 do_cleanups (inner_cleanup
);
2422 struct gdbarch
*gdbarch
2423 = get_type_arch (value_type (val_args
[i
]));
2424 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2425 "wchar_t", NULL
, 0);
2426 struct type
*valtype
;
2427 struct obstack output
;
2428 struct cleanup
*inner_cleanup
;
2429 const gdb_byte
*bytes
;
2431 valtype
= value_type (val_args
[i
]);
2432 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2433 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2434 error (_("expected wchar_t argument for %%lc"));
2436 bytes
= value_contents (val_args
[i
]);
2438 obstack_init (&output
);
2439 inner_cleanup
= make_cleanup_obstack_free (&output
);
2441 convert_between_encodings (target_wide_charset (gdbarch
),
2443 bytes
, TYPE_LENGTH (valtype
),
2444 TYPE_LENGTH (valtype
),
2445 &output
, translit_char
);
2446 obstack_grow_str0 (&output
, "");
2448 fprintf_filtered (stream
, current_substring
,
2449 obstack_base (&output
));
2450 do_cleanups (inner_cleanup
);
2455 struct type
*type
= value_type (val_args
[i
]);
2459 /* If format string wants a float, unchecked-convert the value
2460 to floating point of the same size. */
2461 type
= float_type_from_length (type
);
2462 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2464 error (_("Invalid floating value found in program."));
2466 fprintf_filtered (stream
, current_substring
, (double) val
);
2469 case long_double_arg
:
2470 #ifdef HAVE_LONG_DOUBLE
2472 struct type
*type
= value_type (val_args
[i
]);
2476 /* If format string wants a float, unchecked-convert the value
2477 to floating point of the same size. */
2478 type
= float_type_from_length (type
);
2479 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2481 error (_("Invalid floating value found in program."));
2483 fprintf_filtered (stream
, current_substring
,
2488 error (_("long double not supported in printf"));
2491 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2493 long long val
= value_as_long (val_args
[i
]);
2495 fprintf_filtered (stream
, current_substring
, val
);
2499 error (_("long long not supported in printf"));
2503 int val
= value_as_long (val_args
[i
]);
2505 fprintf_filtered (stream
, current_substring
, val
);
2510 long val
= value_as_long (val_args
[i
]);
2512 fprintf_filtered (stream
, current_substring
, val
);
2516 /* Handles decimal floating values. */
2519 const gdb_byte
*param_ptr
= value_contents (val_args
[i
]);
2521 #if defined (PRINTF_HAS_DECFLOAT)
2522 /* If we have native support for Decimal floating
2523 printing, handle it here. */
2524 fprintf_filtered (stream
, current_substring
, param_ptr
);
2527 /* As a workaround until vasprintf has native support for DFP
2528 we convert the DFP values to string and print them using
2529 the %s format specifier. */
2532 int nnull_chars
= 0;
2534 /* Parameter data. */
2535 struct type
*param_type
= value_type (val_args
[i
]);
2536 unsigned int param_len
= TYPE_LENGTH (param_type
);
2537 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2538 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2540 /* DFP output data. */
2541 struct value
*dfp_value
= NULL
;
2545 struct type
*dfp_type
= NULL
;
2546 char decstr
[MAX_DECIMAL_STRING
];
2548 /* Points to the end of the string so that we can go back
2549 and check for DFP length modifiers. */
2550 eos
= current_substring
+ strlen (current_substring
);
2552 /* Look for the float/double format specifier. */
2553 while (*eos
!= 'f' && *eos
!= 'e' && *eos
!= 'E'
2554 && *eos
!= 'g' && *eos
!= 'G')
2559 /* Search for the '%' char and extract the size and type of
2560 the output decimal value based on its modifiers
2561 (%Hf, %Df, %DDf). */
2562 while (*--sos
!= '%')
2567 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2569 else if (*sos
== 'D' && *(sos
- 1) == 'D')
2572 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2578 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2582 /* Replace %Hf, %Df and %DDf with %s's. */
2585 /* Go through the whole format string and pull the correct
2586 number of chars back to compensate for the change in the
2587 format specifier. */
2588 while (nnull_chars
< nargs
- i
)
2596 /* Conversion between different DFP types. */
2597 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2598 decimal_convert (param_ptr
, param_len
, byte_order
,
2599 dec
, dfp_len
, byte_order
);
2601 /* If this is a non-trivial conversion, just output 0.
2602 A correct converted value can be displayed by explicitly
2603 casting to a DFP type. */
2604 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2606 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2608 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2610 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2612 /* Print the DFP value. */
2613 fprintf_filtered (stream
, current_substring
, decstr
);
2621 /* We avoid the host's %p because pointers are too
2622 likely to be the wrong size. The only interesting
2623 modifier for %p is a width; extract that, and then
2624 handle %p as glibc would: %#x or a literal "(nil)". */
2626 char *p
, *fmt
, *fmt_p
;
2627 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2628 long long val
= value_as_long (val_args
[i
]);
2630 long val
= value_as_long (val_args
[i
]);
2633 fmt
= alloca (strlen (current_substring
) + 5);
2635 /* Copy up to the leading %. */
2636 p
= current_substring
;
2640 int is_percent
= (*p
== '%');
2655 /* Copy any width. */
2656 while (*p
>= '0' && *p
< '9')
2659 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2662 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2668 fprintf_filtered (stream
, fmt
, val
);
2674 fprintf_filtered (stream
, fmt
, "(nil)");
2680 internal_error (__FILE__
, __LINE__
,
2681 _("failed internal consistency check"));
2683 /* Skip to the next substring. */
2684 current_substring
+= strlen (current_substring
) + 1;
2686 /* Print the portion of the format string after the last argument.
2687 Note that this will not include any ordinary %-specs, but it
2688 might include "%%". That is why we use printf_filtered and not
2689 puts_filtered here. Also, we pass a dummy argument because
2690 some platforms have modified GCC to include -Wformat-security
2691 by default, which will warn here if there is no argument. */
2692 fprintf_filtered (stream
, last_arg
, 0);
2694 do_cleanups (old_cleanups
);
2697 /* Implement the "printf" command. */
2700 printf_command (char *arg
, int from_tty
)
2702 ui_printf (arg
, gdb_stdout
);
2705 /* Implement the "eval" command. */
2708 eval_command (char *arg
, int from_tty
)
2710 struct ui_file
*ui_out
= mem_fileopen ();
2711 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2714 ui_printf (arg
, ui_out
);
2716 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2717 make_cleanup (xfree
, expanded
);
2719 execute_command (expanded
, from_tty
);
2721 do_cleanups (cleanups
);
2725 _initialize_printcmd (void)
2727 struct cmd_list_element
*c
;
2729 current_display_number
= -1;
2731 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2733 add_info ("address", address_info
,
2734 _("Describe where symbol SYM is stored."));
2736 add_info ("symbol", sym_info
, _("\
2737 Describe what symbol is at location ADDR.\n\
2738 Only for symbols with fixed locations (global or static scope)."));
2740 add_com ("x", class_vars
, x_command
, _("\
2741 Examine memory: x/FMT ADDRESS.\n\
2742 ADDRESS is an expression for the memory address to examine.\n\
2743 FMT is a repeat count followed by a format letter and a size letter.\n\
2744 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2745 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2746 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2747 The specified number of objects of the specified size are printed\n\
2748 according to the format.\n\n\
2749 Defaults for format and size letters are those previously used.\n\
2750 Default count is 1. Default address is following last thing printed\n\
2751 with this command or \"print\"."));
2754 add_com ("whereis", class_vars
, whereis_command
,
2755 _("Print line number and file of definition of variable."));
2758 add_info ("display", display_info
, _("\
2759 Expressions to display when program stops, with code numbers."));
2761 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2762 Cancel some expressions to be displayed when program stops.\n\
2763 Arguments are the code numbers of the expressions to stop displaying.\n\
2764 No argument means cancel all automatic-display expressions.\n\
2765 \"delete display\" has the same effect as this command.\n\
2766 Do \"info display\" to see current list of code numbers."),
2769 add_com ("display", class_vars
, display_command
, _("\
2770 Print value of expression EXP each time the program stops.\n\
2771 /FMT may be used before EXP as in the \"print\" command.\n\
2772 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2773 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2774 and examining is done as in the \"x\" command.\n\n\
2775 With no argument, display all currently requested auto-display expressions.\n\
2776 Use \"undisplay\" to cancel display requests previously made."));
2778 add_cmd ("display", class_vars
, enable_display_command
, _("\
2779 Enable some expressions to be displayed when program stops.\n\
2780 Arguments are the code numbers of the expressions to resume displaying.\n\
2781 No argument means enable all automatic-display expressions.\n\
2782 Do \"info display\" to see current list of code numbers."), &enablelist
);
2784 add_cmd ("display", class_vars
, disable_display_command
, _("\
2785 Disable some expressions to be displayed when program stops.\n\
2786 Arguments are the code numbers of the expressions to stop displaying.\n\
2787 No argument means disable all automatic-display expressions.\n\
2788 Do \"info display\" to see current list of code numbers."), &disablelist
);
2790 add_cmd ("display", class_vars
, undisplay_command
, _("\
2791 Cancel some expressions to be displayed when program stops.\n\
2792 Arguments are the code numbers of the expressions to stop displaying.\n\
2793 No argument means cancel all automatic-display expressions.\n\
2794 Do \"info display\" to see current list of code numbers."), &deletelist
);
2796 add_com ("printf", class_vars
, printf_command
, _("\
2797 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2798 This is useful for formatted output in user-defined commands."));
2800 add_com ("output", class_vars
, output_command
, _("\
2801 Like \"print\" but don't put in value history and don't print newline.\n\
2802 This is useful in user-defined commands."));
2804 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2805 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2806 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2807 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2808 with $), a register (a few standard names starting with $), or an actual\n\
2809 variable in the program being debugged. EXP is any valid expression.\n\
2810 Use \"set variable\" for variables with names identical to set subcommands.\n\
2812 With a subcommand, this command modifies parts of the gdb environment.\n\
2813 You can see these environment settings with the \"show\" command."),
2814 &setlist
, "set ", 1, &cmdlist
);
2816 add_com ("assign", 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\
2823 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2824 You can see these environment settings with the \"show\" command."));
2826 /* "call" is the same as "set", but handy for dbx users to call fns. */
2827 c
= add_com ("call", class_vars
, call_command
, _("\
2828 Call a function in the program.\n\
2829 The argument is the function name and arguments, in the notation of the\n\
2830 current working language. The result is printed and saved in the value\n\
2831 history, if it is not void."));
2832 set_cmd_completer (c
, expression_completer
);
2834 add_cmd ("variable", class_vars
, set_command
, _("\
2835 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2836 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2837 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2838 with $), a register (a few standard names starting with $), or an actual\n\
2839 variable in the program being debugged. EXP is any valid expression.\n\
2840 This may usually be abbreviated to simply \"set\"."),
2843 c
= add_com ("print", class_vars
, print_command
, _("\
2844 Print value of expression EXP.\n\
2845 Variables accessible are those of the lexical environment of the selected\n\
2846 stack frame, plus all those whose scope is global or an entire file.\n\
2848 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2849 $$NUM refers to NUM'th value back from the last one.\n\
2850 Names starting with $ refer to registers (with the values they would have\n\
2851 if the program were to return to the stack frame now selected, restoring\n\
2852 all registers saved by frames farther in) or else to debugger\n\
2853 \"convenience\" variables (any such name not a known register).\n\
2854 Use assignment expressions to give values to convenience variables.\n\
2856 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2857 @ is a binary operator for treating consecutive data objects\n\
2858 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2859 element is FOO, whose second element is stored in the space following\n\
2860 where FOO is stored, etc. FOO must be an expression whose value\n\
2861 resides in memory.\n\
2863 EXP may be preceded with /FMT, where FMT is a format letter\n\
2864 but no count or size letter (see \"x\" command)."));
2865 set_cmd_completer (c
, expression_completer
);
2866 add_com_alias ("p", "print", class_vars
, 1);
2868 c
= add_com ("inspect", class_vars
, inspect_command
, _("\
2869 Same as \"print\" command, except that if you are running in the epoch\n\
2870 environment, the value is printed in its own window."));
2871 set_cmd_completer (c
, expression_completer
);
2873 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2874 &max_symbolic_offset
, _("\
2875 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2876 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2878 show_max_symbolic_offset
,
2879 &setprintlist
, &showprintlist
);
2880 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2881 &print_symbol_filename
, _("\
2882 Set printing of source filename and line number with <symbol>."), _("\
2883 Show printing of source filename and line number with <symbol>."), NULL
,
2885 show_print_symbol_filename
,
2886 &setprintlist
, &showprintlist
);
2888 add_com ("eval", no_class
, eval_command
, _("\
2889 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2890 a command line, and call it."));