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 an error or 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 int within_current_scope
;
1668 if (d
->enabled_p
== 0)
1671 /* The expression carries the architecture that was used at parse time.
1672 This is a problem if the expression depends on architecture features
1673 (e.g. register numbers), and the current architecture is now different.
1674 For example, a display statement like "display/i $pc" is expected to
1675 display the PC register of the current architecture, not the arch at
1676 the time the display command was given. Therefore, we re-parse the
1677 expression if the current architecture has changed. */
1678 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1687 volatile struct gdb_exception ex
;
1689 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1691 innermost_block
= NULL
;
1692 d
->exp
= parse_expression (d
->exp_string
);
1693 d
->block
= innermost_block
;
1697 /* Can't re-parse the expression. Disable this display item. */
1699 warning (_("Unable to display \"%s\": %s"),
1700 d
->exp_string
, ex
.message
);
1707 if (d
->pspace
== current_program_space
)
1708 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1710 within_current_scope
= 0;
1713 within_current_scope
= 1;
1714 if (!within_current_scope
)
1717 current_display_number
= d
->number
;
1719 annotate_display_begin ();
1720 printf_filtered ("%d", d
->number
);
1721 annotate_display_number_end ();
1722 printf_filtered (": ");
1728 annotate_display_format ();
1730 printf_filtered ("x/");
1731 if (d
->format
.count
!= 1)
1732 printf_filtered ("%d", d
->format
.count
);
1733 printf_filtered ("%c", d
->format
.format
);
1734 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1735 printf_filtered ("%c", d
->format
.size
);
1736 printf_filtered (" ");
1738 annotate_display_expression ();
1740 puts_filtered (d
->exp_string
);
1741 annotate_display_expression_end ();
1743 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1744 printf_filtered ("\n");
1746 printf_filtered (" ");
1748 val
= evaluate_expression (d
->exp
);
1749 addr
= value_as_address (val
);
1750 if (d
->format
.format
== 'i')
1751 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1753 annotate_display_value ();
1755 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1759 struct value_print_options opts
;
1761 annotate_display_format ();
1763 if (d
->format
.format
)
1764 printf_filtered ("/%c ", d
->format
.format
);
1766 annotate_display_expression ();
1768 puts_filtered (d
->exp_string
);
1769 annotate_display_expression_end ();
1771 printf_filtered (" = ");
1773 annotate_display_expression ();
1775 get_formatted_print_options (&opts
, d
->format
.format
);
1776 opts
.raw
= d
->format
.raw
;
1777 print_formatted (evaluate_expression (d
->exp
),
1778 d
->format
.size
, &opts
, gdb_stdout
);
1779 printf_filtered ("\n");
1782 annotate_display_end ();
1784 gdb_flush (gdb_stdout
);
1785 current_display_number
= -1;
1788 /* Display all of the values on the auto-display chain which can be
1789 evaluated in the current scope. */
1796 for (d
= display_chain
; d
; d
= d
->next
)
1800 /* Delete the auto-display which we were in the process of displaying.
1801 This is done when there is an error or a signal. */
1804 disable_display (int num
)
1808 for (d
= display_chain
; d
; d
= d
->next
)
1809 if (d
->number
== num
)
1814 printf_unfiltered (_("No display number %d.\n"), num
);
1818 disable_current_display (void)
1820 if (current_display_number
>= 0)
1822 disable_display (current_display_number
);
1823 fprintf_unfiltered (gdb_stderr
,
1824 _("Disabling display %d to "
1825 "avoid infinite recursion.\n"),
1826 current_display_number
);
1828 current_display_number
= -1;
1832 display_info (char *ignore
, int from_tty
)
1837 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1839 printf_filtered (_("Auto-display expressions now in effect:\n\
1840 Num Enb Expression\n"));
1842 for (d
= display_chain
; d
; d
= d
->next
)
1844 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1846 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1848 else if (d
->format
.format
)
1849 printf_filtered ("/%c ", d
->format
.format
);
1850 puts_filtered (d
->exp_string
);
1851 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1852 printf_filtered (_(" (cannot be evaluated in the current context)"));
1853 printf_filtered ("\n");
1854 gdb_flush (gdb_stdout
);
1858 /* Callback fo map_display_numbers, that enables or disables the
1859 passed in display D. */
1862 do_enable_disable_display (struct display
*d
, void *data
)
1864 d
->enabled_p
= *(int *) data
;
1867 /* Implamentation of both the "disable display" and "enable display"
1868 commands. ENABLE decides what to do. */
1871 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1878 d
->enabled_p
= enable
;
1882 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1885 /* The "enable display" command. */
1888 enable_display_command (char *args
, int from_tty
)
1890 enable_disable_display_command (args
, from_tty
, 1);
1893 /* The "disable display" command. */
1896 disable_display_command (char *args
, int from_tty
)
1898 enable_disable_display_command (args
, from_tty
, 0);
1901 /* display_chain items point to blocks and expressions. Some expressions in
1902 turn may point to symbols.
1903 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1904 obstack_free'd when a shared library is unloaded.
1905 Clear pointers that are about to become dangling.
1906 Both .exp and .block fields will be restored next time we need to display
1907 an item by re-parsing .exp_string field in the new execution context. */
1910 clear_dangling_display_expressions (struct so_list
*solib
)
1912 struct objfile
*objfile
= solib
->objfile
;
1915 /* With no symbol file we cannot have a block or expression from it. */
1916 if (objfile
== NULL
)
1918 if (objfile
->separate_debug_objfile_backlink
)
1919 objfile
= objfile
->separate_debug_objfile_backlink
;
1920 gdb_assert (objfile
->pspace
== solib
->pspace
);
1922 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1924 if (d
->pspace
!= solib
->pspace
)
1927 if (lookup_objfile_from_block (d
->block
) == objfile
1928 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1938 /* Print the value in stack frame FRAME of a variable specified by a
1939 struct symbol. NAME is the name to print; if NULL then VAR's print
1940 name will be used. STREAM is the ui_file on which to print the
1941 value. INDENT specifies the number of indent levels to print
1942 before printing the variable name. */
1945 print_variable_and_value (const char *name
, struct symbol
*var
,
1946 struct frame_info
*frame
,
1947 struct ui_file
*stream
, int indent
)
1949 volatile struct gdb_exception except
;
1952 name
= SYMBOL_PRINT_NAME (var
);
1954 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1955 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1958 struct value_print_options opts
;
1960 val
= read_var_value (var
, frame
);
1961 get_user_print_options (&opts
);
1962 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1964 if (except
.reason
< 0)
1965 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
1967 fprintf_filtered (stream
, "\n");
1970 /* printf "printf format string" ARG to STREAM. */
1973 ui_printf (char *arg
, struct ui_file
*stream
)
1977 char *string
= NULL
;
1978 struct value
**val_args
;
1980 char *current_substring
;
1982 int allocated_args
= 20;
1983 struct cleanup
*old_cleanups
;
1985 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
1986 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
1989 error_no_arg (_("format-control string and values to print"));
1991 s
= skip_spaces (s
);
1993 /* A format string should follow, enveloped in double quotes. */
1995 error (_("Bad format string, missing '\"'."));
1997 /* Parse the format-control string and copy it into the string STRING,
1998 processing some kinds of escape sequence. */
2000 f
= string
= (char *) alloca (strlen (s
) + 1);
2008 error (_("Bad format string, non-terminated '\"'."));
2041 /* ??? TODO: handle other escape sequences. */
2042 error (_("Unrecognized escape character \\%c in format string."),
2052 /* Skip over " and following space and comma. */
2055 s
= skip_spaces (s
);
2057 if (*s
!= ',' && *s
!= 0)
2058 error (_("Invalid argument syntax"));
2062 s
= skip_spaces (s
);
2064 /* Need extra space for the '\0's. Doubling the size is sufficient. */
2065 substrings
= alloca (strlen (string
) * 2);
2066 current_substring
= substrings
;
2069 /* Now scan the string for %-specs and see what kinds of args they want.
2070 argclass[I] classifies the %-specs so we can give printf_filtered
2071 something of the right size. */
2075 int_arg
, long_arg
, long_long_arg
, ptr_arg
,
2076 string_arg
, wide_string_arg
, wide_char_arg
,
2077 double_arg
, long_double_arg
, decfloat_arg
2079 enum argclass
*argclass
;
2080 enum argclass this_argclass
;
2085 argclass
= (enum argclass
*) alloca (strlen (s
) * sizeof *argclass
);
2092 int seen_hash
= 0, seen_zero
= 0, lcount
= 0, seen_prec
= 0;
2093 int seen_space
= 0, seen_plus
= 0;
2094 int seen_big_l
= 0, seen_h
= 0, seen_big_h
= 0;
2095 int seen_big_d
= 0, seen_double_big_d
= 0;
2098 /* Check the validity of the format specifier, and work
2099 out what argument it expects. We only accept C89
2100 format strings, with the exception of long long (which
2101 we autoconf for). */
2103 /* Skip over "%%". */
2110 /* The first part of a format specifier is a set of flag
2112 while (strchr ("0-+ #", *f
))
2125 /* The next part of a format specifier is a width. */
2126 while (strchr ("0123456789", *f
))
2129 /* The next part of a format specifier is a precision. */
2134 while (strchr ("0123456789", *f
))
2138 /* The next part of a format specifier is a length modifier. */
2159 /* Decimal32 modifier. */
2165 /* Decimal64 and Decimal128 modifiers. */
2170 /* Check for a Decimal128. */
2174 seen_double_big_d
= 1;
2190 if (seen_space
|| seen_plus
)
2197 this_argclass
= int_arg
;
2198 else if (lcount
== 1)
2199 this_argclass
= long_arg
;
2201 this_argclass
= long_long_arg
;
2208 this_argclass
= lcount
== 0 ? int_arg
: wide_char_arg
;
2209 if (lcount
> 1 || seen_h
|| seen_big_l
)
2211 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2216 this_argclass
= ptr_arg
;
2217 if (lcount
|| seen_h
|| seen_big_l
)
2219 if (seen_prec
|| seen_zero
|| seen_space
|| seen_plus
)
2224 this_argclass
= lcount
== 0 ? string_arg
: wide_string_arg
;
2225 if (lcount
> 1 || seen_h
|| seen_big_l
)
2227 if (seen_zero
|| seen_space
|| seen_plus
)
2236 if (seen_big_h
|| seen_big_d
|| seen_double_big_d
)
2237 this_argclass
= decfloat_arg
;
2238 else if (seen_big_l
)
2239 this_argclass
= long_double_arg
;
2241 this_argclass
= double_arg
;
2243 if (lcount
|| seen_h
)
2248 error (_("`*' not supported for precision or width in printf"));
2251 error (_("Format specifier `n' not supported in printf"));
2254 error (_("Incomplete format specifier at end of format string"));
2257 error (_("Unrecognized format specifier '%c' in printf"), *f
);
2261 error (_("Inappropriate modifiers to "
2262 "format specifier '%c' in printf"),
2267 if (lcount
> 1 && USE_PRINTF_I64
)
2269 /* Windows' printf does support long long, but not the usual way.
2270 Convert %lld to %I64d. */
2271 int length_before_ll
= f
- last_arg
- 1 - lcount
;
2273 strncpy (current_substring
, last_arg
, length_before_ll
);
2274 strcpy (current_substring
+ length_before_ll
, "I64");
2275 current_substring
[length_before_ll
+ 3] =
2276 last_arg
[length_before_ll
+ lcount
];
2277 current_substring
+= length_before_ll
+ 4;
2279 else if (this_argclass
== wide_string_arg
2280 || this_argclass
== wide_char_arg
)
2282 /* Convert %ls or %lc to %s. */
2283 int length_before_ls
= f
- last_arg
- 2;
2285 strncpy (current_substring
, last_arg
, length_before_ls
);
2286 strcpy (current_substring
+ length_before_ls
, "s");
2287 current_substring
+= length_before_ls
+ 2;
2291 strncpy (current_substring
, last_arg
, f
- last_arg
);
2292 current_substring
+= f
- last_arg
;
2294 *current_substring
++ = '\0';
2296 argclass
[nargs_wanted
++] = this_argclass
;
2299 /* Now, parse all arguments and evaluate them.
2300 Store the VALUEs in VAL_ARGS. */
2306 if (nargs
== allocated_args
)
2307 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2308 (allocated_args
*= 2)
2309 * sizeof (struct value
*));
2311 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2319 if (nargs
!= nargs_wanted
)
2320 error (_("Wrong number of arguments for specified format-string"));
2322 /* Now actually print them. */
2323 current_substring
= substrings
;
2324 for (i
= 0; i
< nargs
; i
++)
2326 switch (argclass
[i
])
2334 tem
= value_as_address (val_args
[i
]);
2336 /* This is a %s argument. Find the length of the string. */
2342 read_memory (tem
+ j
, &c
, 1);
2347 /* Copy the string contents into a string inside GDB. */
2348 str
= (gdb_byte
*) alloca (j
+ 1);
2350 read_memory (tem
, str
, j
);
2353 fprintf_filtered (stream
, current_substring
, (char *) str
);
2356 case wide_string_arg
:
2361 struct gdbarch
*gdbarch
2362 = get_type_arch (value_type (val_args
[i
]));
2363 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2364 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2365 "wchar_t", NULL
, 0);
2366 int wcwidth
= TYPE_LENGTH (wctype
);
2367 gdb_byte
*buf
= alloca (wcwidth
);
2368 struct obstack output
;
2369 struct cleanup
*inner_cleanup
;
2371 tem
= value_as_address (val_args
[i
]);
2373 /* This is a %s argument. Find the length of the string. */
2374 for (j
= 0;; j
+= wcwidth
)
2377 read_memory (tem
+ j
, buf
, wcwidth
);
2378 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2382 /* Copy the string contents into a string inside GDB. */
2383 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2385 read_memory (tem
, str
, j
);
2386 memset (&str
[j
], 0, wcwidth
);
2388 obstack_init (&output
);
2389 inner_cleanup
= make_cleanup_obstack_free (&output
);
2391 convert_between_encodings (target_wide_charset (gdbarch
),
2394 &output
, translit_char
);
2395 obstack_grow_str0 (&output
, "");
2397 fprintf_filtered (stream
, current_substring
,
2398 obstack_base (&output
));
2399 do_cleanups (inner_cleanup
);
2404 struct gdbarch
*gdbarch
2405 = get_type_arch (value_type (val_args
[i
]));
2406 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2407 "wchar_t", NULL
, 0);
2408 struct type
*valtype
;
2409 struct obstack output
;
2410 struct cleanup
*inner_cleanup
;
2411 const gdb_byte
*bytes
;
2413 valtype
= value_type (val_args
[i
]);
2414 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2415 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2416 error (_("expected wchar_t argument for %%lc"));
2418 bytes
= value_contents (val_args
[i
]);
2420 obstack_init (&output
);
2421 inner_cleanup
= make_cleanup_obstack_free (&output
);
2423 convert_between_encodings (target_wide_charset (gdbarch
),
2425 bytes
, TYPE_LENGTH (valtype
),
2426 TYPE_LENGTH (valtype
),
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 type
*type
= value_type (val_args
[i
]);
2441 /* If format string wants a float, unchecked-convert the value
2442 to floating point of the same size. */
2443 type
= float_type_from_length (type
);
2444 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2446 error (_("Invalid floating value found in program."));
2448 fprintf_filtered (stream
, current_substring
, (double) val
);
2451 case long_double_arg
:
2452 #ifdef HAVE_LONG_DOUBLE
2454 struct type
*type
= value_type (val_args
[i
]);
2458 /* If format string wants a float, unchecked-convert the value
2459 to floating point of the same size. */
2460 type
= float_type_from_length (type
);
2461 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2463 error (_("Invalid floating value found in program."));
2465 fprintf_filtered (stream
, current_substring
,
2470 error (_("long double not supported in printf"));
2473 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2475 long long val
= value_as_long (val_args
[i
]);
2477 fprintf_filtered (stream
, current_substring
, val
);
2481 error (_("long long not supported in printf"));
2485 int val
= value_as_long (val_args
[i
]);
2487 fprintf_filtered (stream
, current_substring
, val
);
2492 long val
= value_as_long (val_args
[i
]);
2494 fprintf_filtered (stream
, current_substring
, val
);
2498 /* Handles decimal floating values. */
2501 const gdb_byte
*param_ptr
= value_contents (val_args
[i
]);
2503 #if defined (PRINTF_HAS_DECFLOAT)
2504 /* If we have native support for Decimal floating
2505 printing, handle it here. */
2506 fprintf_filtered (stream
, current_substring
, param_ptr
);
2509 /* As a workaround until vasprintf has native support for DFP
2510 we convert the DFP values to string and print them using
2511 the %s format specifier. */
2514 int nnull_chars
= 0;
2516 /* Parameter data. */
2517 struct type
*param_type
= value_type (val_args
[i
]);
2518 unsigned int param_len
= TYPE_LENGTH (param_type
);
2519 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2520 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2522 /* DFP output data. */
2523 struct value
*dfp_value
= NULL
;
2527 struct type
*dfp_type
= NULL
;
2528 char decstr
[MAX_DECIMAL_STRING
];
2530 /* Points to the end of the string so that we can go back
2531 and check for DFP length modifiers. */
2532 eos
= current_substring
+ strlen (current_substring
);
2534 /* Look for the float/double format specifier. */
2535 while (*eos
!= 'f' && *eos
!= 'e' && *eos
!= 'E'
2536 && *eos
!= 'g' && *eos
!= 'G')
2541 /* Search for the '%' char and extract the size and type of
2542 the output decimal value based on its modifiers
2543 (%Hf, %Df, %DDf). */
2544 while (*--sos
!= '%')
2549 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2551 else if (*sos
== 'D' && *(sos
- 1) == 'D')
2554 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2560 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2564 /* Replace %Hf, %Df and %DDf with %s's. */
2567 /* Go through the whole format string and pull the correct
2568 number of chars back to compensate for the change in the
2569 format specifier. */
2570 while (nnull_chars
< nargs
- i
)
2578 /* Conversion between different DFP types. */
2579 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2580 decimal_convert (param_ptr
, param_len
, byte_order
,
2581 dec
, dfp_len
, byte_order
);
2583 /* If this is a non-trivial conversion, just output 0.
2584 A correct converted value can be displayed by explicitly
2585 casting to a DFP type. */
2586 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2588 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2590 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2592 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2594 /* Print the DFP value. */
2595 fprintf_filtered (stream
, current_substring
, decstr
);
2603 /* We avoid the host's %p because pointers are too
2604 likely to be the wrong size. The only interesting
2605 modifier for %p is a width; extract that, and then
2606 handle %p as glibc would: %#x or a literal "(nil)". */
2608 char *p
, *fmt
, *fmt_p
;
2609 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2610 long long val
= value_as_long (val_args
[i
]);
2612 long val
= value_as_long (val_args
[i
]);
2615 fmt
= alloca (strlen (current_substring
) + 5);
2617 /* Copy up to the leading %. */
2618 p
= current_substring
;
2622 int is_percent
= (*p
== '%');
2637 /* Copy any width. */
2638 while (*p
>= '0' && *p
< '9')
2641 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2644 #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG)
2650 fprintf_filtered (stream
, fmt
, val
);
2656 fprintf_filtered (stream
, fmt
, "(nil)");
2662 internal_error (__FILE__
, __LINE__
,
2663 _("failed internal consistency check"));
2665 /* Skip to the next substring. */
2666 current_substring
+= strlen (current_substring
) + 1;
2668 /* Print the portion of the format string after the last argument.
2669 Note that this will not include any ordinary %-specs, but it
2670 might include "%%". That is why we use printf_filtered and not
2671 puts_filtered here. Also, we pass a dummy argument because
2672 some platforms have modified GCC to include -Wformat-security
2673 by default, which will warn here if there is no argument. */
2674 fprintf_filtered (stream
, last_arg
, 0);
2676 do_cleanups (old_cleanups
);
2679 /* Implement the "printf" command. */
2682 printf_command (char *arg
, int from_tty
)
2684 ui_printf (arg
, gdb_stdout
);
2687 /* Implement the "eval" command. */
2690 eval_command (char *arg
, int from_tty
)
2692 struct ui_file
*ui_out
= mem_fileopen ();
2693 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2696 ui_printf (arg
, ui_out
);
2698 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2699 make_cleanup (xfree
, expanded
);
2701 execute_command (expanded
, from_tty
);
2703 do_cleanups (cleanups
);
2707 _initialize_printcmd (void)
2709 struct cmd_list_element
*c
;
2711 current_display_number
= -1;
2713 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2715 add_info ("address", address_info
,
2716 _("Describe where symbol SYM is stored."));
2718 add_info ("symbol", sym_info
, _("\
2719 Describe what symbol is at location ADDR.\n\
2720 Only for symbols with fixed locations (global or static scope)."));
2722 add_com ("x", class_vars
, x_command
, _("\
2723 Examine memory: x/FMT ADDRESS.\n\
2724 ADDRESS is an expression for the memory address to examine.\n\
2725 FMT is a repeat count followed by a format letter and a size letter.\n\
2726 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2727 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2728 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2729 The specified number of objects of the specified size are printed\n\
2730 according to the format.\n\n\
2731 Defaults for format and size letters are those previously used.\n\
2732 Default count is 1. Default address is following last thing printed\n\
2733 with this command or \"print\"."));
2736 add_com ("whereis", class_vars
, whereis_command
,
2737 _("Print line number and file of definition of variable."));
2740 add_info ("display", display_info
, _("\
2741 Expressions to display when program stops, with code numbers."));
2743 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2744 Cancel some expressions to be displayed when program stops.\n\
2745 Arguments are the code numbers of the expressions to stop displaying.\n\
2746 No argument means cancel all automatic-display expressions.\n\
2747 \"delete display\" has the same effect as this command.\n\
2748 Do \"info display\" to see current list of code numbers."),
2751 add_com ("display", class_vars
, display_command
, _("\
2752 Print value of expression EXP each time the program stops.\n\
2753 /FMT may be used before EXP as in the \"print\" command.\n\
2754 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2755 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2756 and examining is done as in the \"x\" command.\n\n\
2757 With no argument, display all currently requested auto-display expressions.\n\
2758 Use \"undisplay\" to cancel display requests previously made."));
2760 add_cmd ("display", class_vars
, enable_display_command
, _("\
2761 Enable some expressions to be displayed when program stops.\n\
2762 Arguments are the code numbers of the expressions to resume displaying.\n\
2763 No argument means enable all automatic-display expressions.\n\
2764 Do \"info display\" to see current list of code numbers."), &enablelist
);
2766 add_cmd ("display", class_vars
, disable_display_command
, _("\
2767 Disable some expressions to be displayed when program stops.\n\
2768 Arguments are the code numbers of the expressions to stop displaying.\n\
2769 No argument means disable all automatic-display expressions.\n\
2770 Do \"info display\" to see current list of code numbers."), &disablelist
);
2772 add_cmd ("display", class_vars
, undisplay_command
, _("\
2773 Cancel some expressions to be displayed when program stops.\n\
2774 Arguments are the code numbers of the expressions to stop displaying.\n\
2775 No argument means cancel all automatic-display expressions.\n\
2776 Do \"info display\" to see current list of code numbers."), &deletelist
);
2778 add_com ("printf", class_vars
, printf_command
, _("\
2779 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2780 This is useful for formatted output in user-defined commands."));
2782 add_com ("output", class_vars
, output_command
, _("\
2783 Like \"print\" but don't put in value history and don't print newline.\n\
2784 This is useful in user-defined commands."));
2786 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2787 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2788 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2789 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2790 with $), a register (a few standard names starting with $), or an actual\n\
2791 variable in the program being debugged. EXP is any valid expression.\n\
2792 Use \"set variable\" for variables with names identical to set subcommands.\n\
2794 With a subcommand, this command modifies parts of the gdb environment.\n\
2795 You can see these environment settings with the \"show\" command."),
2796 &setlist
, "set ", 1, &cmdlist
);
2798 add_com ("assign", class_vars
, set_command
, _("\
2799 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2800 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2801 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2802 with $), a register (a few standard names starting with $), or an actual\n\
2803 variable in the program being debugged. EXP is any valid expression.\n\
2804 Use \"set variable\" for variables with names identical to set subcommands.\n\
2805 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2806 You can see these environment settings with the \"show\" command."));
2808 /* "call" is the same as "set", but handy for dbx users to call fns. */
2809 c
= add_com ("call", class_vars
, call_command
, _("\
2810 Call a function in the program.\n\
2811 The argument is the function name and arguments, in the notation of the\n\
2812 current working language. The result is printed and saved in the value\n\
2813 history, if it is not void."));
2814 set_cmd_completer (c
, expression_completer
);
2816 add_cmd ("variable", 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 This may usually be abbreviated to simply \"set\"."),
2825 c
= add_com ("print", class_vars
, print_command
, _("\
2826 Print value of expression EXP.\n\
2827 Variables accessible are those of the lexical environment of the selected\n\
2828 stack frame, plus all those whose scope is global or an entire file.\n\
2830 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2831 $$NUM refers to NUM'th value back from the last one.\n\
2832 Names starting with $ refer to registers (with the values they would have\n\
2833 if the program were to return to the stack frame now selected, restoring\n\
2834 all registers saved by frames farther in) or else to debugger\n\
2835 \"convenience\" variables (any such name not a known register).\n\
2836 Use assignment expressions to give values to convenience variables.\n\
2838 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2839 @ is a binary operator for treating consecutive data objects\n\
2840 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2841 element is FOO, whose second element is stored in the space following\n\
2842 where FOO is stored, etc. FOO must be an expression whose value\n\
2843 resides in memory.\n\
2845 EXP may be preceded with /FMT, where FMT is a format letter\n\
2846 but no count or size letter (see \"x\" command)."));
2847 set_cmd_completer (c
, expression_completer
);
2848 add_com_alias ("p", "print", class_vars
, 1);
2850 c
= add_com ("inspect", class_vars
, inspect_command
, _("\
2851 Same as \"print\" command, except that if you are running in the epoch\n\
2852 environment, the value is printed in its own window."));
2853 set_cmd_completer (c
, expression_completer
);
2855 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2856 &max_symbolic_offset
, _("\
2857 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2858 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2860 show_max_symbolic_offset
,
2861 &setprintlist
, &showprintlist
);
2862 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2863 &print_symbol_filename
, _("\
2864 Set printing of source filename and line number with <symbol>."), _("\
2865 Show printing of source filename and line number with <symbol>."), NULL
,
2867 show_print_symbol_filename
,
2868 &setprintlist
, &showprintlist
);
2870 add_com ("eval", no_class
, eval_command
, _("\
2871 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2872 a command line, and call it."));