1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "expression.h"
31 #include "breakpoint.h"
33 #include "gdb-demangle.h"
36 #include "symfile.h" /* for overlay functions */
37 #include "objfiles.h" /* ditto */
38 #include "completer.h" /* for completion functions */
40 #include "gdb_assert.h"
44 #include "exceptions.h"
47 #include "parser-defs.h"
49 #include "arch-utils.h"
50 #include "cli/cli-utils.h"
55 #include "tui/tui.h" /* For tui_active et al. */
64 /* True if the value should be printed raw -- that is, bypassing
65 python-based formatters. */
69 /* Last specified output format. */
71 static char last_format
= 0;
73 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
75 static char last_size
= 'w';
77 /* Default address to examine next, and associated architecture. */
79 static struct gdbarch
*next_gdbarch
;
80 static CORE_ADDR next_address
;
82 /* Number of delay instructions following current disassembled insn. */
84 static int branch_delay_insns
;
86 /* Last address examined. */
88 static CORE_ADDR last_examine_address
;
90 /* Contents of last address examined.
91 This is not valid past the end of the `x' command! */
93 static struct value
*last_examine_value
;
95 /* Largest offset between a symbolic value and an address, that will be
96 printed as `0x1234 <symbol+offset>'. */
98 static unsigned int max_symbolic_offset
= UINT_MAX
;
100 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
101 struct cmd_list_element
*c
, const char *value
)
103 fprintf_filtered (file
,
104 _("The largest offset that will be "
105 "printed in <symbol+1234> form is %s.\n"),
109 /* Append the source filename and linenumber of the symbol when
110 printing a symbolic value as `<symbol at filename:linenum>' if set. */
111 static int print_symbol_filename
= 0;
113 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
114 struct cmd_list_element
*c
, const char *value
)
116 fprintf_filtered (file
, _("Printing of source filename and "
117 "line number with <symbol> is %s.\n"),
121 /* Number of auto-display expression currently being displayed.
122 So that we can disable it if we get a signal within it.
123 -1 when not doing one. */
125 static int current_display_number
;
129 /* Chain link to next auto-display item. */
130 struct display
*next
;
132 /* The expression as the user typed it. */
135 /* Expression to be evaluated and displayed. */
136 struct expression
*exp
;
138 /* Item number of this auto-display item. */
141 /* Display format specified. */
142 struct format_data format
;
144 /* Program space associated with `block'. */
145 struct program_space
*pspace
;
147 /* Innermost block required by this expression when evaluated. */
148 const struct block
*block
;
150 /* Status of this display (enabled or disabled). */
154 /* Chain of expressions whose values should be displayed
155 automatically each time the program stops. */
157 static struct display
*display_chain
;
159 static int display_number
;
161 /* Walk the following statement or block through all displays.
162 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
165 #define ALL_DISPLAYS(B) \
166 for (B = display_chain; B; B = B->next)
168 #define ALL_DISPLAYS_SAFE(B,TMP) \
169 for (B = display_chain; \
170 B ? (TMP = B->next, 1): 0; \
173 /* Prototypes for exported functions. */
175 void _initialize_printcmd (void);
177 /* Prototypes for local functions. */
179 static void do_one_display (struct display
*);
182 /* Decode a format specification. *STRING_PTR should point to it.
183 OFORMAT and OSIZE are used as defaults for the format and size
184 if none are given in the format specification.
185 If OSIZE is zero, then the size field of the returned value
186 should be set only if a size is explicitly specified by the
188 The structure returned describes all the data
189 found in the specification. In addition, *STRING_PTR is advanced
190 past the specification and past all whitespace following it. */
192 static struct format_data
193 decode_format (const char **string_ptr
, int oformat
, int osize
)
195 struct format_data val
;
196 const char *p
= *string_ptr
;
203 if (*p
>= '0' && *p
<= '9')
204 val
.count
= atoi (p
);
205 while (*p
>= '0' && *p
<= '9')
208 /* Now process size or format letters that follow. */
212 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
219 else if (*p
>= 'a' && *p
<= 'z')
225 while (*p
== ' ' || *p
== '\t')
229 /* Set defaults for format and size if not specified. */
230 if (val
.format
== '?')
234 /* Neither has been specified. */
235 val
.format
= oformat
;
239 /* If a size is specified, any format makes a reasonable
240 default except 'i'. */
241 val
.format
= oformat
== 'i' ? 'x' : oformat
;
243 else if (val
.size
== '?')
247 /* Pick the appropriate size for an address. This is deferred
248 until do_examine when we know the actual architecture to use.
249 A special size value of 'a' is used to indicate this case. */
250 val
.size
= osize
? 'a' : osize
;
253 /* Floating point has to be word or giantword. */
254 if (osize
== 'w' || osize
== 'g')
257 /* Default it to giantword if the last used size is not
259 val
.size
= osize
? 'g' : osize
;
262 /* Characters default to one byte. */
263 val
.size
= osize
? 'b' : osize
;
266 /* Display strings with byte size chars unless explicitly
272 /* The default is the size most recently specified. */
279 /* Print value VAL on stream according to OPTIONS.
280 Do not end with a newline.
281 SIZE is the letter for the size of datum being printed.
282 This is used to pad hex numbers so they line up. SIZE is 0
283 for print / output and set for examine. */
286 print_formatted (struct value
*val
, int size
,
287 const struct value_print_options
*options
,
288 struct ui_file
*stream
)
290 struct type
*type
= check_typedef (value_type (val
));
291 int len
= TYPE_LENGTH (type
);
293 if (VALUE_LVAL (val
) == lval_memory
)
294 next_address
= value_address (val
) + len
;
298 switch (options
->format
)
302 struct type
*elttype
= value_type (val
);
304 next_address
= (value_address (val
)
305 + val_print_string (elttype
, NULL
,
306 value_address (val
), -1,
307 stream
, options
) * len
);
312 /* We often wrap here if there are long symbolic names. */
314 next_address
= (value_address (val
)
315 + gdb_print_insn (get_type_arch (type
),
316 value_address (val
), stream
,
317 &branch_delay_insns
));
322 if (options
->format
== 0 || options
->format
== 's'
323 || TYPE_CODE (type
) == TYPE_CODE_REF
324 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
325 || TYPE_CODE (type
) == TYPE_CODE_STRING
326 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
327 || TYPE_CODE (type
) == TYPE_CODE_UNION
328 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
329 value_print (val
, stream
, options
);
331 /* User specified format, so don't look to the type to tell us
333 val_print_scalar_formatted (type
,
334 value_contents_for_printing (val
),
335 value_embedded_offset (val
),
337 options
, size
, stream
);
340 /* Return builtin floating point type of same length as TYPE.
341 If no such type is found, return TYPE itself. */
343 float_type_from_length (struct type
*type
)
345 struct gdbarch
*gdbarch
= get_type_arch (type
);
346 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
348 if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_float
))
349 type
= builtin
->builtin_float
;
350 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_double
))
351 type
= builtin
->builtin_double
;
352 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_long_double
))
353 type
= builtin
->builtin_long_double
;
358 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
359 according to OPTIONS and SIZE on STREAM. Formats s and i are not
360 supported at this level. */
363 print_scalar_formatted (const void *valaddr
, struct type
*type
,
364 const struct value_print_options
*options
,
365 int size
, struct ui_file
*stream
)
367 struct gdbarch
*gdbarch
= get_type_arch (type
);
368 LONGEST val_long
= 0;
369 unsigned int len
= TYPE_LENGTH (type
);
370 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
372 /* String printing should go through val_print_scalar_formatted. */
373 gdb_assert (options
->format
!= 's');
375 if (len
> sizeof(LONGEST
) &&
376 (TYPE_CODE (type
) == TYPE_CODE_INT
377 || TYPE_CODE (type
) == TYPE_CODE_ENUM
))
379 switch (options
->format
)
382 print_octal_chars (stream
, valaddr
, len
, byte_order
);
386 print_decimal_chars (stream
, valaddr
, len
, byte_order
);
389 print_binary_chars (stream
, valaddr
, len
, byte_order
);
392 print_hex_chars (stream
, valaddr
, len
, byte_order
);
395 print_char_chars (stream
, type
, valaddr
, len
, byte_order
);
402 if (options
->format
!= 'f')
403 val_long
= unpack_long (type
, valaddr
);
405 /* If the value is a pointer, and pointers and addresses are not the
406 same, then at this point, the value's length (in target bytes) is
407 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
408 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
409 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
411 /* If we are printing it as unsigned, truncate it in case it is actually
412 a negative signed value (e.g. "print/u (short)-1" should print 65535
413 (if shorts are 16 bits) instead of 4294967295). */
414 if (options
->format
!= 'd' || TYPE_UNSIGNED (type
))
416 if (len
< sizeof (LONGEST
))
417 val_long
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* len
) - 1;
420 switch (options
->format
)
425 /* No size specified, like in print. Print varying # of digits. */
426 print_longest (stream
, 'x', 1, val_long
);
435 print_longest (stream
, size
, 1, val_long
);
438 error (_("Undefined output size \"%c\"."), size
);
443 print_longest (stream
, 'd', 1, val_long
);
447 print_longest (stream
, 'u', 0, val_long
);
452 print_longest (stream
, 'o', 1, val_long
);
454 fprintf_filtered (stream
, "0");
459 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
461 print_address (gdbarch
, addr
, stream
);
467 struct value_print_options opts
= *options
;
470 if (TYPE_UNSIGNED (type
))
471 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
473 type
= builtin_type (gdbarch
)->builtin_true_char
;
475 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
480 type
= float_type_from_length (type
);
481 print_floating (valaddr
, type
, stream
);
485 internal_error (__FILE__
, __LINE__
,
486 _("failed internal consistency check"));
489 /* Binary; 't' stands for "two". */
491 char bits
[8 * (sizeof val_long
) + 1];
492 char buf
[8 * (sizeof val_long
) + 32];
497 width
= 8 * (sizeof val_long
);
514 error (_("Undefined output size \"%c\"."), size
);
520 bits
[width
] = (val_long
& 1) ? '1' : '0';
525 while (*cp
&& *cp
== '0')
530 strncpy (buf
, cp
, sizeof (bits
));
531 fputs_filtered (buf
, stream
);
536 print_hex_chars (stream
, valaddr
, len
, byte_order
);
540 error (_("Undefined output format \"%c\"."), options
->format
);
544 /* Specify default address for `x' command.
545 The `info lines' command uses this. */
548 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
550 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
552 next_gdbarch
= gdbarch
;
555 /* Make address available to the user as $_. */
556 set_internalvar (lookup_internalvar ("_"),
557 value_from_pointer (ptr_type
, addr
));
560 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
561 after LEADIN. Print nothing if no symbolic name is found nearby.
562 Optionally also print source file and line number, if available.
563 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
564 or to interpret it as a possible C++ name and convert it back to source
565 form. However note that DO_DEMANGLE can be overridden by the specific
566 settings of the demangle and asm_demangle variables. Returns
567 non-zero if anything was printed; zero otherwise. */
570 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
571 struct ui_file
*stream
,
572 int do_demangle
, char *leadin
)
575 char *filename
= NULL
;
580 /* Throw away both name and filename. */
581 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
582 make_cleanup (free_current_contents
, &filename
);
584 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
585 &filename
, &line
, &unmapped
))
587 do_cleanups (cleanup_chain
);
591 fputs_filtered (leadin
, stream
);
593 fputs_filtered ("<*", stream
);
595 fputs_filtered ("<", stream
);
596 fputs_filtered (name
, stream
);
598 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
600 /* Append source filename and line number if desired. Give specific
601 line # of this addr, if we have it; else line # of the nearest symbol. */
602 if (print_symbol_filename
&& filename
!= NULL
)
605 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
607 fprintf_filtered (stream
, " in %s", filename
);
610 fputs_filtered ("*>", stream
);
612 fputs_filtered (">", stream
);
614 do_cleanups (cleanup_chain
);
618 /* Given an address ADDR return all the elements needed to print the
619 address in a symbolic form. NAME can be mangled or not depending
620 on DO_DEMANGLE (and also on the asm_demangle global variable,
621 manipulated via ''set print asm-demangle''). Return 0 in case of
622 success, when all the info in the OUT paramters is valid. Return 1
625 build_address_symbolic (struct gdbarch
*gdbarch
,
626 CORE_ADDR addr
, /* IN */
627 int do_demangle
, /* IN */
628 char **name
, /* OUT */
629 int *offset
, /* OUT */
630 char **filename
, /* OUT */
632 int *unmapped
) /* OUT */
634 struct minimal_symbol
*msymbol
;
635 struct symbol
*symbol
;
636 CORE_ADDR name_location
= 0;
637 struct obj_section
*section
= NULL
;
638 const char *name_temp
= "";
640 /* Let's say it is mapped (not unmapped). */
643 /* Determine if the address is in an overlay, and whether it is
645 if (overlay_debugging
)
647 section
= find_pc_overlay (addr
);
648 if (pc_in_unmapped_range (addr
, section
))
651 addr
= overlay_mapped_address (addr
, section
);
655 /* First try to find the address in the symbol table, then
656 in the minsyms. Take the closest one. */
658 /* This is defective in the sense that it only finds text symbols. So
659 really this is kind of pointless--we should make sure that the
660 minimal symbols have everything we need (by changing that we could
661 save some memory, but for many debug format--ELF/DWARF or
662 anything/stabs--it would be inconvenient to eliminate those minimal
664 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
).minsym
;
665 symbol
= find_pc_sect_function (addr
, section
);
669 /* If this is a function (i.e. a code address), strip out any
670 non-address bits. For instance, display a pointer to the
671 first instruction of a Thumb function as <function>; the
672 second instruction will be <function+2>, even though the
673 pointer is <function+3>. This matches the ISA behavior. */
674 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
676 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
677 if (do_demangle
|| asm_demangle
)
678 name_temp
= SYMBOL_PRINT_NAME (symbol
);
680 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
684 && MSYMBOL_HAS_SIZE (msymbol
)
685 && MSYMBOL_SIZE (msymbol
) == 0
686 && MSYMBOL_TYPE (msymbol
) != mst_text
687 && MSYMBOL_TYPE (msymbol
) != mst_text_gnu_ifunc
688 && MSYMBOL_TYPE (msymbol
) != mst_file_text
)
693 if (SYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
695 /* If this is a function (i.e. a code address), strip out any
696 non-address bits. For instance, display a pointer to the
697 first instruction of a Thumb function as <function>; the
698 second instruction will be <function+2>, even though the
699 pointer is <function+3>. This matches the ISA behavior. */
700 if (MSYMBOL_TYPE (msymbol
) == mst_text
701 || MSYMBOL_TYPE (msymbol
) == mst_text_gnu_ifunc
702 || MSYMBOL_TYPE (msymbol
) == mst_file_text
703 || MSYMBOL_TYPE (msymbol
) == mst_solib_trampoline
)
704 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
706 /* The msymbol is closer to the address than the symbol;
707 use the msymbol instead. */
709 name_location
= SYMBOL_VALUE_ADDRESS (msymbol
);
710 if (do_demangle
|| asm_demangle
)
711 name_temp
= SYMBOL_PRINT_NAME (msymbol
);
713 name_temp
= SYMBOL_LINKAGE_NAME (msymbol
);
716 if (symbol
== NULL
&& msymbol
== NULL
)
719 /* If the nearest symbol is too far away, don't print anything symbolic. */
721 /* For when CORE_ADDR is larger than unsigned int, we do math in
722 CORE_ADDR. But when we detect unsigned wraparound in the
723 CORE_ADDR math, we ignore this test and print the offset,
724 because addr+max_symbolic_offset has wrapped through the end
725 of the address space back to the beginning, giving bogus comparison. */
726 if (addr
> name_location
+ max_symbolic_offset
727 && name_location
+ max_symbolic_offset
> name_location
)
730 *offset
= addr
- name_location
;
732 *name
= xstrdup (name_temp
);
734 if (print_symbol_filename
)
736 struct symtab_and_line sal
;
738 sal
= find_pc_sect_line (addr
, section
, 0);
742 *filename
= xstrdup (symtab_to_filename_for_display (sal
.symtab
));
750 /* Print address ADDR symbolically on STREAM.
751 First print it as a number. Then perhaps print
752 <SYMBOL + OFFSET> after the number. */
755 print_address (struct gdbarch
*gdbarch
,
756 CORE_ADDR addr
, struct ui_file
*stream
)
758 fputs_filtered (paddress (gdbarch
, addr
), stream
);
759 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
762 /* Return a prefix for instruction address:
763 "=> " for current instruction, else " ". */
766 pc_prefix (CORE_ADDR addr
)
768 if (has_stack_frames ())
770 struct frame_info
*frame
;
773 frame
= get_selected_frame (NULL
);
774 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
780 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
781 controls whether to print the symbolic name "raw" or demangled.
782 Return non-zero if anything was printed; zero otherwise. */
785 print_address_demangle (const struct value_print_options
*opts
,
786 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
787 struct ui_file
*stream
, int do_demangle
)
789 if (opts
->addressprint
)
791 fputs_filtered (paddress (gdbarch
, addr
), stream
);
792 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
796 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
802 /* Examine data at address ADDR in format FMT.
803 Fetch it from memory and print on gdb_stdout. */
806 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
811 struct type
*val_type
= NULL
;
814 struct value_print_options opts
;
819 next_gdbarch
= gdbarch
;
822 /* Instruction format implies fetch single bytes
823 regardless of the specified size.
824 The case of strings is handled in decode_format, only explicit
825 size operator are not changed to 'b'. */
831 /* Pick the appropriate size for an address. */
832 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
834 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
836 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
839 /* Bad value for gdbarch_ptr_bit. */
840 internal_error (__FILE__
, __LINE__
,
841 _("failed internal consistency check"));
845 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
846 else if (size
== 'h')
847 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
848 else if (size
== 'w')
849 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
850 else if (size
== 'g')
851 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
855 struct type
*char_type
= NULL
;
857 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
858 if type is not found. */
860 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
861 else if (size
== 'w')
862 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
864 val_type
= char_type
;
867 if (size
!= '\0' && size
!= 'b')
868 warning (_("Unable to display strings with "
869 "size '%c', using 'b' instead."), size
);
871 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
880 if (format
== 's' || format
== 'i')
883 get_formatted_print_options (&opts
, format
);
885 /* Print as many objects as specified in COUNT, at most maxelts per line,
886 with the address of the next one at the start of each line. */
892 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
893 print_address (next_gdbarch
, next_address
, gdb_stdout
);
894 printf_filtered (":");
899 printf_filtered ("\t");
900 /* Note that print_formatted sets next_address for the next
902 last_examine_address
= next_address
;
904 if (last_examine_value
)
905 value_free (last_examine_value
);
907 /* The value to be displayed is not fetched greedily.
908 Instead, to avoid the possibility of a fetched value not
909 being used, its retrieval is delayed until the print code
910 uses it. When examining an instruction stream, the
911 disassembler will perform its own memory fetch using just
912 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
913 the disassembler be modified so that LAST_EXAMINE_VALUE
914 is left with the byte sequence from the last complete
915 instruction fetched from memory? */
916 last_examine_value
= value_at_lazy (val_type
, next_address
);
918 if (last_examine_value
)
919 release_value (last_examine_value
);
921 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
923 /* Display any branch delay slots following the final insn. */
924 if (format
== 'i' && count
== 1)
925 count
+= branch_delay_insns
;
927 printf_filtered ("\n");
928 gdb_flush (gdb_stdout
);
933 validate_format (struct format_data fmt
, char *cmdname
)
936 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
938 error (_("Item count other than 1 is meaningless in \"%s\" command."),
940 if (fmt
.format
== 'i')
941 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
942 fmt
.format
, cmdname
);
945 /* Evaluate string EXP as an expression in the current language and
946 print the resulting value. EXP may contain a format specifier as the
947 first argument ("/x myvar" for example, to print myvar in hex). */
950 print_command_1 (const char *exp
, int voidprint
)
952 struct expression
*expr
;
953 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
956 struct format_data fmt
;
958 if (exp
&& *exp
== '/')
961 fmt
= decode_format (&exp
, last_format
, 0);
962 validate_format (fmt
, "print");
963 last_format
= format
= fmt
.format
;
975 expr
= parse_expression (exp
);
976 make_cleanup (free_current_contents
, &expr
);
977 val
= evaluate_expression (expr
);
980 val
= access_value_history (0);
982 if (voidprint
|| (val
&& value_type (val
) &&
983 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
985 struct value_print_options opts
;
986 int histindex
= record_latest_value (val
);
989 annotate_value_history_begin (histindex
, value_type (val
));
991 annotate_value_begin (value_type (val
));
994 printf_filtered ("$%d = ", histindex
);
997 annotate_value_history_value ();
999 get_formatted_print_options (&opts
, format
);
1002 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1003 printf_filtered ("\n");
1006 annotate_value_history_end ();
1008 annotate_value_end ();
1011 do_cleanups (old_chain
);
1015 print_command (char *exp
, int from_tty
)
1017 print_command_1 (exp
, 1);
1020 /* Same as print, except it doesn't print void results. */
1022 call_command (char *exp
, int from_tty
)
1024 print_command_1 (exp
, 0);
1027 /* Implementation of the "output" command. */
1030 output_command (char *exp
, int from_tty
)
1032 output_command_const (exp
, from_tty
);
1035 /* Like output_command, but takes a const string as argument. */
1038 output_command_const (const char *exp
, int from_tty
)
1040 struct expression
*expr
;
1041 struct cleanup
*old_chain
;
1044 struct format_data fmt
;
1045 struct value_print_options opts
;
1050 if (exp
&& *exp
== '/')
1053 fmt
= decode_format (&exp
, 0, 0);
1054 validate_format (fmt
, "output");
1055 format
= fmt
.format
;
1058 expr
= parse_expression (exp
);
1059 old_chain
= make_cleanup (free_current_contents
, &expr
);
1061 val
= evaluate_expression (expr
);
1063 annotate_value_begin (value_type (val
));
1065 get_formatted_print_options (&opts
, format
);
1067 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1069 annotate_value_end ();
1072 gdb_flush (gdb_stdout
);
1074 do_cleanups (old_chain
);
1078 set_command (char *exp
, int from_tty
)
1080 struct expression
*expr
= parse_expression (exp
);
1081 struct cleanup
*old_chain
=
1082 make_cleanup (free_current_contents
, &expr
);
1084 if (expr
->nelts
>= 1)
1085 switch (expr
->elts
[0].opcode
)
1087 case UNOP_PREINCREMENT
:
1088 case UNOP_POSTINCREMENT
:
1089 case UNOP_PREDECREMENT
:
1090 case UNOP_POSTDECREMENT
:
1092 case BINOP_ASSIGN_MODIFY
:
1097 (_("Expression is not an assignment (and might have no effect)"));
1100 evaluate_expression (expr
);
1101 do_cleanups (old_chain
);
1105 sym_info (char *arg
, int from_tty
)
1107 struct minimal_symbol
*msymbol
;
1108 struct objfile
*objfile
;
1109 struct obj_section
*osect
;
1110 CORE_ADDR addr
, sect_addr
;
1112 unsigned int offset
;
1115 error_no_arg (_("address"));
1117 addr
= parse_and_eval_address (arg
);
1118 ALL_OBJSECTIONS (objfile
, osect
)
1120 /* Only process each object file once, even if there's a separate
1122 if (objfile
->separate_debug_objfile_backlink
)
1125 sect_addr
= overlay_mapped_address (addr
, osect
);
1127 if (obj_section_addr (osect
) <= sect_addr
1128 && sect_addr
< obj_section_endaddr (osect
)
1130 = lookup_minimal_symbol_by_pc_section (sect_addr
, osect
).minsym
))
1132 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1134 struct cleanup
*old_chain
;
1137 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1138 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1139 sec_name
= osect
->the_bfd_section
->name
;
1140 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1142 /* Don't print the offset if it is zero.
1143 We assume there's no need to handle i18n of "sym + offset". */
1145 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1147 loc_string
= xstrprintf ("%s", msym_name
);
1149 /* Use a cleanup to free loc_string in case the user quits
1150 a pagination request inside printf_filtered. */
1151 old_chain
= make_cleanup (xfree
, loc_string
);
1153 gdb_assert (osect
->objfile
&& objfile_name (osect
->objfile
));
1154 obj_name
= objfile_name (osect
->objfile
);
1156 if (MULTI_OBJFILE_P ())
1157 if (pc_in_unmapped_range (addr
, osect
))
1158 if (section_is_overlay (osect
))
1159 printf_filtered (_("%s in load address range of "
1160 "%s overlay section %s of %s\n"),
1161 loc_string
, mapped
, sec_name
, obj_name
);
1163 printf_filtered (_("%s in load address range of "
1164 "section %s of %s\n"),
1165 loc_string
, sec_name
, obj_name
);
1167 if (section_is_overlay (osect
))
1168 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1169 loc_string
, mapped
, sec_name
, obj_name
);
1171 printf_filtered (_("%s in section %s of %s\n"),
1172 loc_string
, sec_name
, obj_name
);
1174 if (pc_in_unmapped_range (addr
, osect
))
1175 if (section_is_overlay (osect
))
1176 printf_filtered (_("%s in load address range of %s overlay "
1178 loc_string
, mapped
, sec_name
);
1180 printf_filtered (_("%s in load address range of section %s\n"),
1181 loc_string
, sec_name
);
1183 if (section_is_overlay (osect
))
1184 printf_filtered (_("%s in %s overlay section %s\n"),
1185 loc_string
, mapped
, sec_name
);
1187 printf_filtered (_("%s in section %s\n"),
1188 loc_string
, sec_name
);
1190 do_cleanups (old_chain
);
1194 printf_filtered (_("No symbol matches %s.\n"), arg
);
1198 address_info (char *exp
, int from_tty
)
1200 struct gdbarch
*gdbarch
;
1203 struct bound_minimal_symbol msymbol
;
1205 struct obj_section
*section
;
1206 CORE_ADDR load_addr
, context_pc
= 0;
1207 struct field_of_this_result is_a_field_of_this
;
1210 error (_("Argument required."));
1212 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1213 &is_a_field_of_this
);
1216 if (is_a_field_of_this
.type
!= NULL
)
1218 printf_filtered ("Symbol \"");
1219 fprintf_symbol_filtered (gdb_stdout
, exp
,
1220 current_language
->la_language
, DMGL_ANSI
);
1221 printf_filtered ("\" is a field of the local class variable ");
1222 if (current_language
->la_language
== language_objc
)
1223 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1225 printf_filtered ("`this'\n");
1229 msymbol
= lookup_bound_minimal_symbol (exp
);
1231 if (msymbol
.minsym
!= NULL
)
1233 struct objfile
*objfile
= msymbol
.objfile
;
1235 gdbarch
= get_objfile_arch (objfile
);
1236 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
.minsym
);
1238 printf_filtered ("Symbol \"");
1239 fprintf_symbol_filtered (gdb_stdout
, exp
,
1240 current_language
->la_language
, DMGL_ANSI
);
1241 printf_filtered ("\" is at ");
1242 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1243 printf_filtered (" in a file compiled without debugging");
1244 section
= SYMBOL_OBJ_SECTION (objfile
, msymbol
.minsym
);
1245 if (section_is_overlay (section
))
1247 load_addr
= overlay_unmapped_address (load_addr
, section
);
1248 printf_filtered (",\n -- loaded at ");
1249 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1250 printf_filtered (" in overlay section %s",
1251 section
->the_bfd_section
->name
);
1253 printf_filtered (".\n");
1256 error (_("No symbol \"%s\" in current context."), exp
);
1260 printf_filtered ("Symbol \"");
1261 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1262 current_language
->la_language
, DMGL_ANSI
);
1263 printf_filtered ("\" is ");
1264 val
= SYMBOL_VALUE (sym
);
1265 section
= SYMBOL_OBJ_SECTION (SYMBOL_OBJFILE (sym
), sym
);
1266 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1268 if (SYMBOL_COMPUTED_OPS (sym
) != NULL
)
1270 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1272 printf_filtered (".\n");
1276 switch (SYMBOL_CLASS (sym
))
1279 case LOC_CONST_BYTES
:
1280 printf_filtered ("constant");
1284 printf_filtered ("a label at address ");
1285 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1286 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1287 if (section_is_overlay (section
))
1289 load_addr
= overlay_unmapped_address (load_addr
, section
);
1290 printf_filtered (",\n -- loaded at ");
1291 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1292 printf_filtered (" in overlay section %s",
1293 section
->the_bfd_section
->name
);
1298 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1301 /* GDBARCH is the architecture associated with the objfile the symbol
1302 is defined in; the target architecture may be different, and may
1303 provide additional registers. However, we do not know the target
1304 architecture at this point. We assume the objfile architecture
1305 will contain all the standard registers that occur in debug info
1307 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1309 if (SYMBOL_IS_ARGUMENT (sym
))
1310 printf_filtered (_("an argument in register %s"),
1311 gdbarch_register_name (gdbarch
, regno
));
1313 printf_filtered (_("a variable in register %s"),
1314 gdbarch_register_name (gdbarch
, regno
));
1318 printf_filtered (_("static storage at address "));
1319 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1320 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1321 if (section_is_overlay (section
))
1323 load_addr
= overlay_unmapped_address (load_addr
, section
);
1324 printf_filtered (_(",\n -- loaded at "));
1325 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1326 printf_filtered (_(" in overlay section %s"),
1327 section
->the_bfd_section
->name
);
1331 case LOC_REGPARM_ADDR
:
1332 /* Note comment at LOC_REGISTER. */
1333 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1334 printf_filtered (_("address of an argument in register %s"),
1335 gdbarch_register_name (gdbarch
, regno
));
1339 printf_filtered (_("an argument at offset %ld"), val
);
1343 printf_filtered (_("a local variable at frame offset %ld"), val
);
1347 printf_filtered (_("a reference argument at offset %ld"), val
);
1351 printf_filtered (_("a typedef"));
1355 printf_filtered (_("a function at address "));
1356 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1357 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1358 if (section_is_overlay (section
))
1360 load_addr
= overlay_unmapped_address (load_addr
, section
);
1361 printf_filtered (_(",\n -- loaded at "));
1362 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1363 printf_filtered (_(" in overlay section %s"),
1364 section
->the_bfd_section
->name
);
1368 case LOC_UNRESOLVED
:
1370 struct bound_minimal_symbol msym
;
1372 msym
= lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym
));
1373 if (msym
.minsym
== NULL
)
1374 printf_filtered ("unresolved");
1377 section
= SYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
);
1378 load_addr
= SYMBOL_VALUE_ADDRESS (msym
.minsym
);
1381 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1382 printf_filtered (_("a thread-local variable at offset %s "
1383 "in the thread-local storage for `%s'"),
1384 paddress (gdbarch
, load_addr
),
1385 objfile_name (section
->objfile
));
1388 printf_filtered (_("static storage at address "));
1389 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1390 if (section_is_overlay (section
))
1392 load_addr
= overlay_unmapped_address (load_addr
, section
);
1393 printf_filtered (_(",\n -- loaded at "));
1394 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1395 printf_filtered (_(" in overlay section %s"),
1396 section
->the_bfd_section
->name
);
1403 case LOC_OPTIMIZED_OUT
:
1404 printf_filtered (_("optimized out"));
1408 printf_filtered (_("of unknown (botched) type"));
1411 printf_filtered (".\n");
1416 x_command (char *exp
, int from_tty
)
1418 struct expression
*expr
;
1419 struct format_data fmt
;
1420 struct cleanup
*old_chain
;
1423 fmt
.format
= last_format
? last_format
: 'x';
1424 fmt
.size
= last_size
;
1428 if (exp
&& *exp
== '/')
1430 const char *tmp
= exp
+ 1;
1432 fmt
= decode_format (&tmp
, last_format
, last_size
);
1436 /* If we have an expression, evaluate it and use it as the address. */
1438 if (exp
!= 0 && *exp
!= 0)
1440 expr
= parse_expression (exp
);
1441 /* Cause expression not to be there any more if this command is
1442 repeated with Newline. But don't clobber a user-defined
1443 command's definition. */
1446 old_chain
= make_cleanup (free_current_contents
, &expr
);
1447 val
= evaluate_expression (expr
);
1448 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1449 val
= coerce_ref (val
);
1450 /* In rvalue contexts, such as this, functions are coerced into
1451 pointers to functions. This makes "x/i main" work. */
1452 if (/* last_format == 'i' && */
1453 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1454 && VALUE_LVAL (val
) == lval_memory
)
1455 next_address
= value_address (val
);
1457 next_address
= value_as_address (val
);
1459 next_gdbarch
= expr
->gdbarch
;
1460 do_cleanups (old_chain
);
1464 error_no_arg (_("starting display address"));
1466 do_examine (fmt
, next_gdbarch
, next_address
);
1468 /* If the examine succeeds, we remember its size and format for next
1469 time. Set last_size to 'b' for strings. */
1470 if (fmt
.format
== 's')
1473 last_size
= fmt
.size
;
1474 last_format
= fmt
.format
;
1476 /* Set a couple of internal variables if appropriate. */
1477 if (last_examine_value
)
1479 /* Make last address examined available to the user as $_. Use
1480 the correct pointer type. */
1481 struct type
*pointer_type
1482 = lookup_pointer_type (value_type (last_examine_value
));
1483 set_internalvar (lookup_internalvar ("_"),
1484 value_from_pointer (pointer_type
,
1485 last_examine_address
));
1487 /* Make contents of last address examined available to the user
1488 as $__. If the last value has not been fetched from memory
1489 then don't fetch it now; instead mark it by voiding the $__
1491 if (value_lazy (last_examine_value
))
1492 clear_internalvar (lookup_internalvar ("__"));
1494 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1499 /* Add an expression to the auto-display chain.
1500 Specify the expression. */
1503 display_command (char *arg
, int from_tty
)
1505 struct format_data fmt
;
1506 struct expression
*expr
;
1507 struct display
*new;
1509 const char *exp
= arg
;
1512 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1514 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1515 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1529 fmt
= decode_format (&exp
, 0, 0);
1530 if (fmt
.size
&& fmt
.format
== 0)
1532 if (fmt
.format
== 'i' || fmt
.format
== 's')
1543 innermost_block
= NULL
;
1544 expr
= parse_expression (exp
);
1546 new = (struct display
*) xmalloc (sizeof (struct display
));
1548 new->exp_string
= xstrdup (exp
);
1550 new->block
= innermost_block
;
1551 new->pspace
= current_program_space
;
1552 new->next
= display_chain
;
1553 new->number
= ++display_number
;
1556 display_chain
= new;
1558 if (from_tty
&& target_has_execution
)
1559 do_one_display (new);
1566 free_display (struct display
*d
)
1568 xfree (d
->exp_string
);
1573 /* Clear out the display_chain. Done when new symtabs are loaded,
1574 since this invalidates the types stored in many expressions. */
1577 clear_displays (void)
1581 while ((d
= display_chain
) != NULL
)
1583 display_chain
= d
->next
;
1588 /* Delete the auto-display DISPLAY. */
1591 delete_display (struct display
*display
)
1595 gdb_assert (display
!= NULL
);
1597 if (display_chain
== display
)
1598 display_chain
= display
->next
;
1601 if (d
->next
== display
)
1603 d
->next
= display
->next
;
1607 free_display (display
);
1610 /* Call FUNCTION on each of the displays whose numbers are given in
1611 ARGS. DATA is passed unmodified to FUNCTION. */
1614 map_display_numbers (char *args
,
1615 void (*function
) (struct display
*,
1619 struct get_number_or_range_state state
;
1623 error_no_arg (_("one or more display numbers"));
1625 init_number_or_range (&state
, args
);
1627 while (!state
.finished
)
1629 char *p
= state
.string
;
1631 num
= get_number_or_range (&state
);
1633 warning (_("bad display number at or near '%s'"), p
);
1636 struct display
*d
, *tmp
;
1638 ALL_DISPLAYS_SAFE (d
, tmp
)
1639 if (d
->number
== num
)
1642 printf_unfiltered (_("No display number %d.\n"), num
);
1649 /* Callback for map_display_numbers, that deletes a display. */
1652 do_delete_display (struct display
*d
, void *data
)
1657 /* "undisplay" command. */
1660 undisplay_command (char *args
, int from_tty
)
1664 if (query (_("Delete all auto-display expressions? ")))
1670 map_display_numbers (args
, do_delete_display
, NULL
);
1674 /* Display a single auto-display.
1675 Do nothing if the display cannot be printed in the current context,
1676 or if the display is disabled. */
1679 do_one_display (struct display
*d
)
1681 struct cleanup
*old_chain
;
1682 int within_current_scope
;
1684 if (d
->enabled_p
== 0)
1687 /* The expression carries the architecture that was used at parse time.
1688 This is a problem if the expression depends on architecture features
1689 (e.g. register numbers), and the current architecture is now different.
1690 For example, a display statement like "display/i $pc" is expected to
1691 display the PC register of the current architecture, not the arch at
1692 the time the display command was given. Therefore, we re-parse the
1693 expression if the current architecture has changed. */
1694 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1703 volatile struct gdb_exception ex
;
1705 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1707 innermost_block
= NULL
;
1708 d
->exp
= parse_expression (d
->exp_string
);
1709 d
->block
= innermost_block
;
1713 /* Can't re-parse the expression. Disable this display item. */
1715 warning (_("Unable to display \"%s\": %s"),
1716 d
->exp_string
, ex
.message
);
1723 if (d
->pspace
== current_program_space
)
1724 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1726 within_current_scope
= 0;
1729 within_current_scope
= 1;
1730 if (!within_current_scope
)
1733 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1734 current_display_number
= d
->number
;
1736 annotate_display_begin ();
1737 printf_filtered ("%d", d
->number
);
1738 annotate_display_number_end ();
1739 printf_filtered (": ");
1742 volatile struct gdb_exception ex
;
1744 annotate_display_format ();
1746 printf_filtered ("x/");
1747 if (d
->format
.count
!= 1)
1748 printf_filtered ("%d", d
->format
.count
);
1749 printf_filtered ("%c", d
->format
.format
);
1750 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1751 printf_filtered ("%c", d
->format
.size
);
1752 printf_filtered (" ");
1754 annotate_display_expression ();
1756 puts_filtered (d
->exp_string
);
1757 annotate_display_expression_end ();
1759 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1760 printf_filtered ("\n");
1762 printf_filtered (" ");
1764 annotate_display_value ();
1766 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1771 val
= evaluate_expression (d
->exp
);
1772 addr
= value_as_address (val
);
1773 if (d
->format
.format
== 'i')
1774 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1775 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1778 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1782 struct value_print_options opts
;
1783 volatile struct gdb_exception ex
;
1785 annotate_display_format ();
1787 if (d
->format
.format
)
1788 printf_filtered ("/%c ", d
->format
.format
);
1790 annotate_display_expression ();
1792 puts_filtered (d
->exp_string
);
1793 annotate_display_expression_end ();
1795 printf_filtered (" = ");
1797 annotate_display_expression ();
1799 get_formatted_print_options (&opts
, d
->format
.format
);
1800 opts
.raw
= d
->format
.raw
;
1802 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1806 val
= evaluate_expression (d
->exp
);
1807 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1810 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1811 printf_filtered ("\n");
1814 annotate_display_end ();
1816 gdb_flush (gdb_stdout
);
1817 do_cleanups (old_chain
);
1820 /* Display all of the values on the auto-display chain which can be
1821 evaluated in the current scope. */
1828 for (d
= display_chain
; d
; d
= d
->next
)
1832 /* Delete the auto-display which we were in the process of displaying.
1833 This is done when there is an error or a signal. */
1836 disable_display (int num
)
1840 for (d
= display_chain
; d
; d
= d
->next
)
1841 if (d
->number
== num
)
1846 printf_unfiltered (_("No display number %d.\n"), num
);
1850 disable_current_display (void)
1852 if (current_display_number
>= 0)
1854 disable_display (current_display_number
);
1855 fprintf_unfiltered (gdb_stderr
,
1856 _("Disabling display %d to "
1857 "avoid infinite recursion.\n"),
1858 current_display_number
);
1860 current_display_number
= -1;
1864 display_info (char *ignore
, int from_tty
)
1869 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1871 printf_filtered (_("Auto-display expressions now in effect:\n\
1872 Num Enb Expression\n"));
1874 for (d
= display_chain
; d
; d
= d
->next
)
1876 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1878 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1880 else if (d
->format
.format
)
1881 printf_filtered ("/%c ", d
->format
.format
);
1882 puts_filtered (d
->exp_string
);
1883 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1884 printf_filtered (_(" (cannot be evaluated in the current context)"));
1885 printf_filtered ("\n");
1886 gdb_flush (gdb_stdout
);
1890 /* Callback fo map_display_numbers, that enables or disables the
1891 passed in display D. */
1894 do_enable_disable_display (struct display
*d
, void *data
)
1896 d
->enabled_p
= *(int *) data
;
1899 /* Implamentation of both the "disable display" and "enable display"
1900 commands. ENABLE decides what to do. */
1903 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1910 d
->enabled_p
= enable
;
1914 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1917 /* The "enable display" command. */
1920 enable_display_command (char *args
, int from_tty
)
1922 enable_disable_display_command (args
, from_tty
, 1);
1925 /* The "disable display" command. */
1928 disable_display_command (char *args
, int from_tty
)
1930 enable_disable_display_command (args
, from_tty
, 0);
1933 /* display_chain items point to blocks and expressions. Some expressions in
1934 turn may point to symbols.
1935 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1936 obstack_free'd when a shared library is unloaded.
1937 Clear pointers that are about to become dangling.
1938 Both .exp and .block fields will be restored next time we need to display
1939 an item by re-parsing .exp_string field in the new execution context. */
1942 clear_dangling_display_expressions (struct objfile
*objfile
)
1945 struct program_space
*pspace
;
1947 /* With no symbol file we cannot have a block or expression from it. */
1948 if (objfile
== NULL
)
1950 pspace
= objfile
->pspace
;
1951 if (objfile
->separate_debug_objfile_backlink
)
1953 objfile
= objfile
->separate_debug_objfile_backlink
;
1954 gdb_assert (objfile
->pspace
== pspace
);
1957 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1959 if (d
->pspace
!= pspace
)
1962 if (lookup_objfile_from_block (d
->block
) == objfile
1963 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1973 /* Print the value in stack frame FRAME of a variable specified by a
1974 struct symbol. NAME is the name to print; if NULL then VAR's print
1975 name will be used. STREAM is the ui_file on which to print the
1976 value. INDENT specifies the number of indent levels to print
1977 before printing the variable name.
1979 This function invalidates FRAME. */
1982 print_variable_and_value (const char *name
, struct symbol
*var
,
1983 struct frame_info
*frame
,
1984 struct ui_file
*stream
, int indent
)
1986 volatile struct gdb_exception except
;
1989 name
= SYMBOL_PRINT_NAME (var
);
1991 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1992 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1995 struct value_print_options opts
;
1997 val
= read_var_value (var
, frame
);
1998 get_user_print_options (&opts
);
2000 common_val_print (val
, stream
, indent
, &opts
, current_language
);
2002 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2006 if (except
.reason
< 0)
2007 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
2009 fprintf_filtered (stream
, "\n");
2012 /* Subroutine of ui_printf to simplify it.
2013 Print VALUE to STREAM using FORMAT.
2014 VALUE is a C-style string on the target. */
2017 printf_c_string (struct ui_file
*stream
, const char *format
,
2018 struct value
*value
)
2024 tem
= value_as_address (value
);
2026 /* This is a %s argument. Find the length of the string. */
2032 read_memory (tem
+ j
, &c
, 1);
2037 /* Copy the string contents into a string inside GDB. */
2038 str
= (gdb_byte
*) alloca (j
+ 1);
2040 read_memory (tem
, str
, j
);
2043 fprintf_filtered (stream
, format
, (char *) str
);
2046 /* Subroutine of ui_printf to simplify it.
2047 Print VALUE to STREAM using FORMAT.
2048 VALUE is a wide C-style string on the target. */
2051 printf_wide_c_string (struct ui_file
*stream
, const char *format
,
2052 struct value
*value
)
2057 struct gdbarch
*gdbarch
= get_type_arch (value_type (value
));
2058 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2059 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2060 "wchar_t", NULL
, 0);
2061 int wcwidth
= TYPE_LENGTH (wctype
);
2062 gdb_byte
*buf
= alloca (wcwidth
);
2063 struct obstack output
;
2064 struct cleanup
*inner_cleanup
;
2066 tem
= value_as_address (value
);
2068 /* This is a %s argument. Find the length of the string. */
2069 for (j
= 0;; j
+= wcwidth
)
2072 read_memory (tem
+ j
, buf
, wcwidth
);
2073 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2077 /* Copy the string contents into a string inside GDB. */
2078 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2080 read_memory (tem
, str
, j
);
2081 memset (&str
[j
], 0, wcwidth
);
2083 obstack_init (&output
);
2084 inner_cleanup
= make_cleanup_obstack_free (&output
);
2086 convert_between_encodings (target_wide_charset (gdbarch
),
2089 &output
, translit_char
);
2090 obstack_grow_str0 (&output
, "");
2092 fprintf_filtered (stream
, format
, obstack_base (&output
));
2093 do_cleanups (inner_cleanup
);
2096 /* Subroutine of ui_printf to simplify it.
2097 Print VALUE, a decimal floating point value, to STREAM using FORMAT. */
2100 printf_decfloat (struct ui_file
*stream
, const char *format
,
2101 struct value
*value
)
2103 const gdb_byte
*param_ptr
= value_contents (value
);
2105 #if defined (PRINTF_HAS_DECFLOAT)
2106 /* If we have native support for Decimal floating
2107 printing, handle it here. */
2108 fprintf_filtered (stream
, format
, param_ptr
);
2110 /* As a workaround until vasprintf has native support for DFP
2111 we convert the DFP values to string and print them using
2112 the %s format specifier. */
2115 /* Parameter data. */
2116 struct type
*param_type
= value_type (value
);
2117 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2118 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2120 /* DFP output data. */
2121 struct value
*dfp_value
= NULL
;
2125 struct type
*dfp_type
= NULL
;
2126 char decstr
[MAX_DECIMAL_STRING
];
2128 /* Points to the end of the string so that we can go back
2129 and check for DFP length modifiers. */
2130 p
= format
+ strlen (format
);
2132 /* Look for the float/double format specifier. */
2133 while (*p
!= 'f' && *p
!= 'e' && *p
!= 'E'
2134 && *p
!= 'g' && *p
!= 'G')
2137 /* Search for the '%' char and extract the size and type of
2138 the output decimal value based on its modifiers
2139 (%Hf, %Df, %DDf). */
2145 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2147 else if (*p
== 'D' && *(p
- 1) == 'D')
2150 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2156 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2160 /* Conversion between different DFP types. */
2161 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2162 decimal_convert (param_ptr
, TYPE_LENGTH (param_type
),
2163 byte_order
, dec
, dfp_len
, byte_order
);
2165 /* If this is a non-trivial conversion, just output 0.
2166 A correct converted value can be displayed by explicitly
2167 casting to a DFP type. */
2168 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2170 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2172 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2174 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2176 /* Print the DFP value. */
2177 fprintf_filtered (stream
, "%s", decstr
);
2181 /* Subroutine of ui_printf to simplify it.
2182 Print VALUE, a target pointer, to STREAM using FORMAT. */
2185 printf_pointer (struct ui_file
*stream
, const char *format
,
2186 struct value
*value
)
2188 /* We avoid the host's %p because pointers are too
2189 likely to be the wrong size. The only interesting
2190 modifier for %p is a width; extract that, and then
2191 handle %p as glibc would: %#x or a literal "(nil)". */
2195 #ifdef PRINTF_HAS_LONG_LONG
2196 long long val
= value_as_long (value
);
2198 long val
= value_as_long (value
);
2201 fmt
= alloca (strlen (format
) + 5);
2203 /* Copy up to the leading %. */
2208 int is_percent
= (*p
== '%');
2223 /* Copy any width. */
2224 while (*p
>= '0' && *p
< '9')
2227 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2230 #ifdef PRINTF_HAS_LONG_LONG
2236 fprintf_filtered (stream
, fmt
, val
);
2242 fprintf_filtered (stream
, fmt
, "(nil)");
2246 /* printf "printf format string" ARG to STREAM. */
2249 ui_printf (const char *arg
, struct ui_file
*stream
)
2251 struct format_piece
*fpieces
;
2252 const char *s
= arg
;
2253 struct value
**val_args
;
2254 int allocated_args
= 20;
2255 struct cleanup
*old_cleanups
;
2257 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2258 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2261 error_no_arg (_("format-control string and values to print"));
2263 s
= skip_spaces_const (s
);
2265 /* A format string should follow, enveloped in double quotes. */
2267 error (_("Bad format string, missing '\"'."));
2269 fpieces
= parse_format_string (&s
);
2271 make_cleanup (free_format_pieces_cleanup
, &fpieces
);
2274 error (_("Bad format string, non-terminated '\"'."));
2276 s
= skip_spaces_const (s
);
2278 if (*s
!= ',' && *s
!= 0)
2279 error (_("Invalid argument syntax"));
2283 s
= skip_spaces_const (s
);
2289 char *current_substring
;
2292 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2293 if (fpieces
[fr
].argclass
!= literal_piece
)
2296 /* Now, parse all arguments and evaluate them.
2297 Store the VALUEs in VAL_ARGS. */
2303 if (nargs
== allocated_args
)
2304 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2305 (allocated_args
*= 2)
2306 * sizeof (struct value
*));
2308 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2316 if (nargs
!= nargs_wanted
)
2317 error (_("Wrong number of arguments for specified format-string"));
2319 /* Now actually print them. */
2321 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2323 current_substring
= fpieces
[fr
].string
;
2324 switch (fpieces
[fr
].argclass
)
2327 printf_c_string (stream
, current_substring
, val_args
[i
]);
2329 case wide_string_arg
:
2330 printf_wide_c_string (stream
, current_substring
, val_args
[i
]);
2334 struct gdbarch
*gdbarch
2335 = get_type_arch (value_type (val_args
[i
]));
2336 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2337 "wchar_t", NULL
, 0);
2338 struct type
*valtype
;
2339 struct obstack output
;
2340 struct cleanup
*inner_cleanup
;
2341 const gdb_byte
*bytes
;
2343 valtype
= value_type (val_args
[i
]);
2344 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2345 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2346 error (_("expected wchar_t argument for %%lc"));
2348 bytes
= value_contents (val_args
[i
]);
2350 obstack_init (&output
);
2351 inner_cleanup
= make_cleanup_obstack_free (&output
);
2353 convert_between_encodings (target_wide_charset (gdbarch
),
2355 bytes
, TYPE_LENGTH (valtype
),
2356 TYPE_LENGTH (valtype
),
2357 &output
, translit_char
);
2358 obstack_grow_str0 (&output
, "");
2360 fprintf_filtered (stream
, current_substring
,
2361 obstack_base (&output
));
2362 do_cleanups (inner_cleanup
);
2367 struct type
*type
= value_type (val_args
[i
]);
2371 /* If format string wants a float, unchecked-convert the value
2372 to floating point of the same size. */
2373 type
= float_type_from_length (type
);
2374 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2376 error (_("Invalid floating value found in program."));
2378 fprintf_filtered (stream
, current_substring
, (double) val
);
2381 case long_double_arg
:
2382 #ifdef HAVE_LONG_DOUBLE
2384 struct type
*type
= value_type (val_args
[i
]);
2388 /* If format string wants a float, unchecked-convert the value
2389 to floating point of the same size. */
2390 type
= float_type_from_length (type
);
2391 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2393 error (_("Invalid floating value found in program."));
2395 fprintf_filtered (stream
, current_substring
,
2400 error (_("long double not supported in printf"));
2403 #ifdef PRINTF_HAS_LONG_LONG
2405 long long val
= value_as_long (val_args
[i
]);
2407 fprintf_filtered (stream
, current_substring
, val
);
2411 error (_("long long not supported in printf"));
2415 int val
= value_as_long (val_args
[i
]);
2417 fprintf_filtered (stream
, current_substring
, val
);
2422 long val
= value_as_long (val_args
[i
]);
2424 fprintf_filtered (stream
, current_substring
, val
);
2427 /* Handles decimal floating values. */
2429 printf_decfloat (stream
, current_substring
, val_args
[i
]);
2432 printf_pointer (stream
, current_substring
, val_args
[i
]);
2435 /* Print a portion of the format string that has no
2436 directives. Note that this will not include any
2437 ordinary %-specs, but it might include "%%". That is
2438 why we use printf_filtered and not puts_filtered here.
2439 Also, we pass a dummy argument because some platforms
2440 have modified GCC to include -Wformat-security by
2441 default, which will warn here if there is no
2443 fprintf_filtered (stream
, current_substring
, 0);
2446 internal_error (__FILE__
, __LINE__
,
2447 _("failed internal consistency check"));
2449 /* Maybe advance to the next argument. */
2450 if (fpieces
[fr
].argclass
!= literal_piece
)
2454 do_cleanups (old_cleanups
);
2457 /* Implement the "printf" command. */
2460 printf_command (char *arg
, int from_tty
)
2462 ui_printf (arg
, gdb_stdout
);
2463 gdb_flush (gdb_stdout
);
2466 /* Implement the "eval" command. */
2469 eval_command (char *arg
, int from_tty
)
2471 struct ui_file
*ui_out
= mem_fileopen ();
2472 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2475 ui_printf (arg
, ui_out
);
2477 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2478 make_cleanup (xfree
, expanded
);
2480 execute_command (expanded
, from_tty
);
2482 do_cleanups (cleanups
);
2486 _initialize_printcmd (void)
2488 struct cmd_list_element
*c
;
2490 current_display_number
= -1;
2492 observer_attach_free_objfile (clear_dangling_display_expressions
);
2494 add_info ("address", address_info
,
2495 _("Describe where symbol SYM is stored."));
2497 add_info ("symbol", sym_info
, _("\
2498 Describe what symbol is at location ADDR.\n\
2499 Only for symbols with fixed locations (global or static scope)."));
2501 add_com ("x", class_vars
, x_command
, _("\
2502 Examine memory: x/FMT ADDRESS.\n\
2503 ADDRESS is an expression for the memory address to examine.\n\
2504 FMT is a repeat count followed by a format letter and a size letter.\n\
2505 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2506 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2507 and z(hex, zero padded on the left).\n\
2508 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2509 The specified number of objects of the specified size are printed\n\
2510 according to the format.\n\n\
2511 Defaults for format and size letters are those previously used.\n\
2512 Default count is 1. Default address is following last thing printed\n\
2513 with this command or \"print\"."));
2516 add_com ("whereis", class_vars
, whereis_command
,
2517 _("Print line number and file of definition of variable."));
2520 add_info ("display", display_info
, _("\
2521 Expressions to display when program stops, with code numbers."));
2523 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2524 Cancel some expressions to be displayed when program stops.\n\
2525 Arguments are the code numbers of the expressions to stop displaying.\n\
2526 No argument means cancel all automatic-display expressions.\n\
2527 \"delete display\" has the same effect as this command.\n\
2528 Do \"info display\" to see current list of code numbers."),
2531 add_com ("display", class_vars
, display_command
, _("\
2532 Print value of expression EXP each time the program stops.\n\
2533 /FMT may be used before EXP as in the \"print\" command.\n\
2534 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2535 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2536 and examining is done as in the \"x\" command.\n\n\
2537 With no argument, display all currently requested auto-display expressions.\n\
2538 Use \"undisplay\" to cancel display requests previously made."));
2540 add_cmd ("display", class_vars
, enable_display_command
, _("\
2541 Enable some expressions to be displayed when program stops.\n\
2542 Arguments are the code numbers of the expressions to resume displaying.\n\
2543 No argument means enable all automatic-display expressions.\n\
2544 Do \"info display\" to see current list of code numbers."), &enablelist
);
2546 add_cmd ("display", class_vars
, disable_display_command
, _("\
2547 Disable some expressions to be displayed when program stops.\n\
2548 Arguments are the code numbers of the expressions to stop displaying.\n\
2549 No argument means disable all automatic-display expressions.\n\
2550 Do \"info display\" to see current list of code numbers."), &disablelist
);
2552 add_cmd ("display", class_vars
, undisplay_command
, _("\
2553 Cancel some expressions to be displayed when program stops.\n\
2554 Arguments are the code numbers of the expressions to stop displaying.\n\
2555 No argument means cancel all automatic-display expressions.\n\
2556 Do \"info display\" to see current list of code numbers."), &deletelist
);
2558 add_com ("printf", class_vars
, printf_command
, _("\
2559 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2560 This is useful for formatted output in user-defined commands."));
2562 add_com ("output", class_vars
, output_command
, _("\
2563 Like \"print\" but don't put in value history and don't print newline.\n\
2564 This is useful in user-defined commands."));
2566 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2567 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2568 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2569 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2570 with $), a register (a few standard names starting with $), or an actual\n\
2571 variable in the program being debugged. EXP is any valid expression.\n\
2572 Use \"set variable\" for variables with names identical to set subcommands.\n\
2574 With a subcommand, this command modifies parts of the gdb environment.\n\
2575 You can see these environment settings with the \"show\" command."),
2576 &setlist
, "set ", 1, &cmdlist
);
2578 add_com ("assign", class_vars
, set_command
, _("\
2579 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2580 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2581 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2582 with $), a register (a few standard names starting with $), or an actual\n\
2583 variable in the program being debugged. EXP is any valid expression.\n\
2584 Use \"set variable\" for variables with names identical to set subcommands.\n\
2585 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2586 You can see these environment settings with the \"show\" command."));
2588 /* "call" is the same as "set", but handy for dbx users to call fns. */
2589 c
= add_com ("call", class_vars
, call_command
, _("\
2590 Call a function in the program.\n\
2591 The argument is the function name and arguments, in the notation of the\n\
2592 current working language. The result is printed and saved in the value\n\
2593 history, if it is not void."));
2594 set_cmd_completer (c
, expression_completer
);
2596 add_cmd ("variable", class_vars
, set_command
, _("\
2597 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2598 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2599 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2600 with $), a register (a few standard names starting with $), or an actual\n\
2601 variable in the program being debugged. EXP is any valid expression.\n\
2602 This may usually be abbreviated to simply \"set\"."),
2605 c
= add_com ("print", class_vars
, print_command
, _("\
2606 Print value of expression EXP.\n\
2607 Variables accessible are those of the lexical environment of the selected\n\
2608 stack frame, plus all those whose scope is global or an entire file.\n\
2610 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2611 $$NUM refers to NUM'th value back from the last one.\n\
2612 Names starting with $ refer to registers (with the values they would have\n\
2613 if the program were to return to the stack frame now selected, restoring\n\
2614 all registers saved by frames farther in) or else to debugger\n\
2615 \"convenience\" variables (any such name not a known register).\n\
2616 Use assignment expressions to give values to convenience variables.\n\
2618 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2619 @ is a binary operator for treating consecutive data objects\n\
2620 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2621 element is FOO, whose second element is stored in the space following\n\
2622 where FOO is stored, etc. FOO must be an expression whose value\n\
2623 resides in memory.\n\
2625 EXP may be preceded with /FMT, where FMT is a format letter\n\
2626 but no count or size letter (see \"x\" command)."));
2627 set_cmd_completer (c
, expression_completer
);
2628 add_com_alias ("p", "print", class_vars
, 1);
2629 add_com_alias ("inspect", "print", class_vars
, 1);
2631 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2632 &max_symbolic_offset
, _("\
2633 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2634 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2635 Tell GDB to only display the symbolic form of an address if the\n\
2636 offset between the closest earlier symbol and the address is less than\n\
2637 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2638 to always print the symbolic form of an address if any symbol precedes\n\
2639 it. Zero is equivalent to \"unlimited\"."),
2641 show_max_symbolic_offset
,
2642 &setprintlist
, &showprintlist
);
2643 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2644 &print_symbol_filename
, _("\
2645 Set printing of source filename and line number with <symbol>."), _("\
2646 Show printing of source filename and line number with <symbol>."), NULL
,
2648 show_print_symbol_filename
,
2649 &setprintlist
, &showprintlist
);
2651 add_com ("eval", no_class
, eval_command
, _("\
2652 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2653 a command line, and call it."));