1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2015 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/>. */
26 #include "expression.h"
30 #include "breakpoint.h"
32 #include "gdb-demangle.h"
35 #include "symfile.h" /* for overlay functions */
36 #include "objfiles.h" /* ditto */
37 #include "completer.h" /* for completion functions */
44 #include "parser-defs.h"
46 #include "arch-utils.h"
47 #include "cli/cli-utils.h"
52 #include "tui/tui.h" /* For tui_active et al. */
61 /* True if the value should be printed raw -- that is, bypassing
62 python-based formatters. */
66 /* Last specified output format. */
68 static char last_format
= 0;
70 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
72 static char last_size
= 'w';
74 /* Default address to examine next, and associated architecture. */
76 static struct gdbarch
*next_gdbarch
;
77 static CORE_ADDR next_address
;
79 /* Number of delay instructions following current disassembled insn. */
81 static int branch_delay_insns
;
83 /* Last address examined. */
85 static CORE_ADDR last_examine_address
;
87 /* Contents of last address examined.
88 This is not valid past the end of the `x' command! */
90 static struct value
*last_examine_value
;
92 /* Largest offset between a symbolic value and an address, that will be
93 printed as `0x1234 <symbol+offset>'. */
95 static unsigned int max_symbolic_offset
= UINT_MAX
;
97 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
98 struct cmd_list_element
*c
, const char *value
)
100 fprintf_filtered (file
,
101 _("The largest offset that will be "
102 "printed in <symbol+1234> form is %s.\n"),
106 /* Append the source filename and linenumber of the symbol when
107 printing a symbolic value as `<symbol at filename:linenum>' if set. */
108 static int print_symbol_filename
= 0;
110 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
111 struct cmd_list_element
*c
, const char *value
)
113 fprintf_filtered (file
, _("Printing of source filename and "
114 "line number with <symbol> is %s.\n"),
118 /* Number of auto-display expression currently being displayed.
119 So that we can disable it if we get a signal within it.
120 -1 when not doing one. */
122 static int current_display_number
;
126 /* Chain link to next auto-display item. */
127 struct display
*next
;
129 /* The expression as the user typed it. */
132 /* Expression to be evaluated and displayed. */
133 struct expression
*exp
;
135 /* Item number of this auto-display item. */
138 /* Display format specified. */
139 struct format_data format
;
141 /* Program space associated with `block'. */
142 struct program_space
*pspace
;
144 /* Innermost block required by this expression when evaluated. */
145 const struct block
*block
;
147 /* Status of this display (enabled or disabled). */
151 /* Chain of expressions whose values should be displayed
152 automatically each time the program stops. */
154 static struct display
*display_chain
;
156 static int display_number
;
158 /* Walk the following statement or block through all displays.
159 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
162 #define ALL_DISPLAYS(B) \
163 for (B = display_chain; B; B = B->next)
165 #define ALL_DISPLAYS_SAFE(B,TMP) \
166 for (B = display_chain; \
167 B ? (TMP = B->next, 1): 0; \
170 /* Prototypes for exported functions. */
172 void _initialize_printcmd (void);
174 /* Prototypes for local functions. */
176 static void do_one_display (struct display
*);
179 /* Decode a format specification. *STRING_PTR should point to it.
180 OFORMAT and OSIZE are used as defaults for the format and size
181 if none are given in the format specification.
182 If OSIZE is zero, then the size field of the returned value
183 should be set only if a size is explicitly specified by the
185 The structure returned describes all the data
186 found in the specification. In addition, *STRING_PTR is advanced
187 past the specification and past all whitespace following it. */
189 static struct format_data
190 decode_format (const char **string_ptr
, int oformat
, int osize
)
192 struct format_data val
;
193 const char *p
= *string_ptr
;
200 if (*p
>= '0' && *p
<= '9')
201 val
.count
= atoi (p
);
202 while (*p
>= '0' && *p
<= '9')
205 /* Now process size or format letters that follow. */
209 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
216 else if (*p
>= 'a' && *p
<= 'z')
222 while (*p
== ' ' || *p
== '\t')
226 /* Set defaults for format and size if not specified. */
227 if (val
.format
== '?')
231 /* Neither has been specified. */
232 val
.format
= oformat
;
236 /* If a size is specified, any format makes a reasonable
237 default except 'i'. */
238 val
.format
= oformat
== 'i' ? 'x' : oformat
;
240 else if (val
.size
== '?')
244 /* Pick the appropriate size for an address. This is deferred
245 until do_examine when we know the actual architecture to use.
246 A special size value of 'a' is used to indicate this case. */
247 val
.size
= osize
? 'a' : osize
;
250 /* Floating point has to be word or giantword. */
251 if (osize
== 'w' || osize
== 'g')
254 /* Default it to giantword if the last used size is not
256 val
.size
= osize
? 'g' : osize
;
259 /* Characters default to one byte. */
260 val
.size
= osize
? 'b' : osize
;
263 /* Display strings with byte size chars unless explicitly
269 /* The default is the size most recently specified. */
276 /* Print value VAL on stream according to OPTIONS.
277 Do not end with a newline.
278 SIZE is the letter for the size of datum being printed.
279 This is used to pad hex numbers so they line up. SIZE is 0
280 for print / output and set for examine. */
283 print_formatted (struct value
*val
, int size
,
284 const struct value_print_options
*options
,
285 struct ui_file
*stream
)
287 struct type
*type
= check_typedef (value_type (val
));
288 int len
= TYPE_LENGTH (type
);
290 if (VALUE_LVAL (val
) == lval_memory
)
291 next_address
= value_address (val
) + len
;
295 switch (options
->format
)
299 struct type
*elttype
= value_type (val
);
301 next_address
= (value_address (val
)
302 + val_print_string (elttype
, NULL
,
303 value_address (val
), -1,
304 stream
, options
) * len
);
309 /* We often wrap here if there are long symbolic names. */
311 next_address
= (value_address (val
)
312 + gdb_print_insn (get_type_arch (type
),
313 value_address (val
), stream
,
314 &branch_delay_insns
));
319 if (options
->format
== 0 || options
->format
== 's'
320 || TYPE_CODE (type
) == TYPE_CODE_REF
321 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
322 || TYPE_CODE (type
) == TYPE_CODE_STRING
323 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
324 || TYPE_CODE (type
) == TYPE_CODE_UNION
325 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
326 value_print (val
, stream
, options
);
328 /* User specified format, so don't look to the type to tell us
330 val_print_scalar_formatted (type
,
331 value_contents_for_printing (val
),
332 value_embedded_offset (val
),
334 options
, size
, stream
);
337 /* Return builtin floating point type of same length as TYPE.
338 If no such type is found, return TYPE itself. */
340 float_type_from_length (struct type
*type
)
342 struct gdbarch
*gdbarch
= get_type_arch (type
);
343 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
345 if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_float
))
346 type
= builtin
->builtin_float
;
347 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_double
))
348 type
= builtin
->builtin_double
;
349 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_long_double
))
350 type
= builtin
->builtin_long_double
;
355 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
356 according to OPTIONS and SIZE on STREAM. Formats s and i are not
357 supported at this level. */
360 print_scalar_formatted (const void *valaddr
, struct type
*type
,
361 const struct value_print_options
*options
,
362 int size
, struct ui_file
*stream
)
364 struct gdbarch
*gdbarch
= get_type_arch (type
);
365 LONGEST val_long
= 0;
366 unsigned int len
= TYPE_LENGTH (type
);
367 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
369 /* String printing should go through val_print_scalar_formatted. */
370 gdb_assert (options
->format
!= 's');
372 if (len
> sizeof(LONGEST
) &&
373 (TYPE_CODE (type
) == TYPE_CODE_INT
374 || TYPE_CODE (type
) == TYPE_CODE_ENUM
))
376 switch (options
->format
)
379 print_octal_chars (stream
, valaddr
, len
, byte_order
);
383 print_decimal_chars (stream
, valaddr
, len
, byte_order
);
386 print_binary_chars (stream
, valaddr
, len
, byte_order
);
389 print_hex_chars (stream
, valaddr
, len
, byte_order
);
392 print_char_chars (stream
, type
, valaddr
, len
, byte_order
);
399 if (options
->format
!= 'f')
400 val_long
= unpack_long (type
, valaddr
);
402 /* If the value is a pointer, and pointers and addresses are not the
403 same, then at this point, the value's length (in target bytes) is
404 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
405 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
406 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
408 /* If we are printing it as unsigned, truncate it in case it is actually
409 a negative signed value (e.g. "print/u (short)-1" should print 65535
410 (if shorts are 16 bits) instead of 4294967295). */
411 if (options
->format
!= 'd' || TYPE_UNSIGNED (type
))
413 if (len
< sizeof (LONGEST
))
414 val_long
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* len
) - 1;
417 switch (options
->format
)
422 /* No size specified, like in print. Print varying # of digits. */
423 print_longest (stream
, 'x', 1, val_long
);
432 print_longest (stream
, size
, 1, val_long
);
435 error (_("Undefined output size \"%c\"."), size
);
440 print_longest (stream
, 'd', 1, val_long
);
444 print_longest (stream
, 'u', 0, val_long
);
449 print_longest (stream
, 'o', 1, val_long
);
451 fprintf_filtered (stream
, "0");
456 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
458 print_address (gdbarch
, addr
, stream
);
464 struct value_print_options opts
= *options
;
467 if (TYPE_UNSIGNED (type
))
468 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
470 type
= builtin_type (gdbarch
)->builtin_true_char
;
472 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
477 type
= float_type_from_length (type
);
478 print_floating (valaddr
, type
, stream
);
482 internal_error (__FILE__
, __LINE__
,
483 _("failed internal consistency check"));
486 /* Binary; 't' stands for "two". */
488 char bits
[8 * (sizeof val_long
) + 1];
489 char buf
[8 * (sizeof val_long
) + 32];
494 width
= 8 * (sizeof val_long
);
511 error (_("Undefined output size \"%c\"."), size
);
517 bits
[width
] = (val_long
& 1) ? '1' : '0';
522 while (*cp
&& *cp
== '0')
527 strncpy (buf
, cp
, sizeof (bits
));
528 fputs_filtered (buf
, stream
);
533 print_hex_chars (stream
, valaddr
, len
, byte_order
);
537 error (_("Undefined output format \"%c\"."), options
->format
);
541 /* Specify default address for `x' command.
542 The `info lines' command uses this. */
545 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
547 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
549 next_gdbarch
= gdbarch
;
552 /* Make address available to the user as $_. */
553 set_internalvar (lookup_internalvar ("_"),
554 value_from_pointer (ptr_type
, addr
));
557 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
558 after LEADIN. Print nothing if no symbolic name is found nearby.
559 Optionally also print source file and line number, if available.
560 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
561 or to interpret it as a possible C++ name and convert it back to source
562 form. However note that DO_DEMANGLE can be overridden by the specific
563 settings of the demangle and asm_demangle variables. Returns
564 non-zero if anything was printed; zero otherwise. */
567 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
568 struct ui_file
*stream
,
569 int do_demangle
, char *leadin
)
572 char *filename
= NULL
;
577 /* Throw away both name and filename. */
578 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
579 make_cleanup (free_current_contents
, &filename
);
581 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
582 &filename
, &line
, &unmapped
))
584 do_cleanups (cleanup_chain
);
588 fputs_filtered (leadin
, stream
);
590 fputs_filtered ("<*", stream
);
592 fputs_filtered ("<", stream
);
593 fputs_filtered (name
, stream
);
595 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
597 /* Append source filename and line number if desired. Give specific
598 line # of this addr, if we have it; else line # of the nearest symbol. */
599 if (print_symbol_filename
&& filename
!= NULL
)
602 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
604 fprintf_filtered (stream
, " in %s", filename
);
607 fputs_filtered ("*>", stream
);
609 fputs_filtered (">", stream
);
611 do_cleanups (cleanup_chain
);
615 /* Given an address ADDR return all the elements needed to print the
616 address in a symbolic form. NAME can be mangled or not depending
617 on DO_DEMANGLE (and also on the asm_demangle global variable,
618 manipulated via ''set print asm-demangle''). Return 0 in case of
619 success, when all the info in the OUT paramters is valid. Return 1
622 build_address_symbolic (struct gdbarch
*gdbarch
,
623 CORE_ADDR addr
, /* IN */
624 int do_demangle
, /* IN */
625 char **name
, /* OUT */
626 int *offset
, /* OUT */
627 char **filename
, /* OUT */
629 int *unmapped
) /* OUT */
631 struct bound_minimal_symbol msymbol
;
632 struct symbol
*symbol
;
633 CORE_ADDR name_location
= 0;
634 struct obj_section
*section
= NULL
;
635 const char *name_temp
= "";
637 /* Let's say it is mapped (not unmapped). */
640 /* Determine if the address is in an overlay, and whether it is
642 if (overlay_debugging
)
644 section
= find_pc_overlay (addr
);
645 if (pc_in_unmapped_range (addr
, section
))
648 addr
= overlay_mapped_address (addr
, section
);
652 /* First try to find the address in the symbol table, then
653 in the minsyms. Take the closest one. */
655 /* This is defective in the sense that it only finds text symbols. So
656 really this is kind of pointless--we should make sure that the
657 minimal symbols have everything we need (by changing that we could
658 save some memory, but for many debug format--ELF/DWARF or
659 anything/stabs--it would be inconvenient to eliminate those minimal
661 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
662 symbol
= find_pc_sect_function (addr
, section
);
666 /* If this is a function (i.e. a code address), strip out any
667 non-address bits. For instance, display a pointer to the
668 first instruction of a Thumb function as <function>; the
669 second instruction will be <function+2>, even though the
670 pointer is <function+3>. This matches the ISA behavior. */
671 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
673 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
674 if (do_demangle
|| asm_demangle
)
675 name_temp
= SYMBOL_PRINT_NAME (symbol
);
677 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
680 if (msymbol
.minsym
!= NULL
681 && MSYMBOL_HAS_SIZE (msymbol
.minsym
)
682 && MSYMBOL_SIZE (msymbol
.minsym
) == 0
683 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text
684 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text_gnu_ifunc
685 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_file_text
)
686 msymbol
.minsym
= NULL
;
688 if (msymbol
.minsym
!= NULL
)
690 if (BMSYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
692 /* If this is a function (i.e. a code address), strip out any
693 non-address bits. For instance, display a pointer to the
694 first instruction of a Thumb function as <function>; the
695 second instruction will be <function+2>, even though the
696 pointer is <function+3>. This matches the ISA behavior. */
697 if (MSYMBOL_TYPE (msymbol
.minsym
) == mst_text
698 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_text_gnu_ifunc
699 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_file_text
700 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_solib_trampoline
)
701 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
703 /* The msymbol is closer to the address than the symbol;
704 use the msymbol instead. */
706 name_location
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
707 if (do_demangle
|| asm_demangle
)
708 name_temp
= MSYMBOL_PRINT_NAME (msymbol
.minsym
);
710 name_temp
= MSYMBOL_LINKAGE_NAME (msymbol
.minsym
);
713 if (symbol
== NULL
&& msymbol
.minsym
== NULL
)
716 /* If the nearest symbol is too far away, don't print anything symbolic. */
718 /* For when CORE_ADDR is larger than unsigned int, we do math in
719 CORE_ADDR. But when we detect unsigned wraparound in the
720 CORE_ADDR math, we ignore this test and print the offset,
721 because addr+max_symbolic_offset has wrapped through the end
722 of the address space back to the beginning, giving bogus comparison. */
723 if (addr
> name_location
+ max_symbolic_offset
724 && name_location
+ max_symbolic_offset
> name_location
)
727 *offset
= addr
- name_location
;
729 *name
= xstrdup (name_temp
);
731 if (print_symbol_filename
)
733 struct symtab_and_line sal
;
735 sal
= find_pc_sect_line (addr
, section
, 0);
739 *filename
= xstrdup (symtab_to_filename_for_display (sal
.symtab
));
747 /* Print address ADDR symbolically on STREAM.
748 First print it as a number. Then perhaps print
749 <SYMBOL + OFFSET> after the number. */
752 print_address (struct gdbarch
*gdbarch
,
753 CORE_ADDR addr
, struct ui_file
*stream
)
755 fputs_filtered (paddress (gdbarch
, addr
), stream
);
756 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
759 /* Return a prefix for instruction address:
760 "=> " for current instruction, else " ". */
763 pc_prefix (CORE_ADDR addr
)
765 if (has_stack_frames ())
767 struct frame_info
*frame
;
770 frame
= get_selected_frame (NULL
);
771 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
777 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
778 controls whether to print the symbolic name "raw" or demangled.
779 Return non-zero if anything was printed; zero otherwise. */
782 print_address_demangle (const struct value_print_options
*opts
,
783 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
784 struct ui_file
*stream
, int do_demangle
)
786 if (opts
->addressprint
)
788 fputs_filtered (paddress (gdbarch
, addr
), stream
);
789 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
793 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
799 /* Examine data at address ADDR in format FMT.
800 Fetch it from memory and print on gdb_stdout. */
803 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
808 struct type
*val_type
= NULL
;
811 struct value_print_options opts
;
816 next_gdbarch
= gdbarch
;
819 /* Instruction format implies fetch single bytes
820 regardless of the specified size.
821 The case of strings is handled in decode_format, only explicit
822 size operator are not changed to 'b'. */
828 /* Pick the appropriate size for an address. */
829 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
831 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
833 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
836 /* Bad value for gdbarch_ptr_bit. */
837 internal_error (__FILE__
, __LINE__
,
838 _("failed internal consistency check"));
842 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
843 else if (size
== 'h')
844 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
845 else if (size
== 'w')
846 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
847 else if (size
== 'g')
848 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
852 struct type
*char_type
= NULL
;
854 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
855 if type is not found. */
857 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
858 else if (size
== 'w')
859 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
861 val_type
= char_type
;
864 if (size
!= '\0' && size
!= 'b')
865 warning (_("Unable to display strings with "
866 "size '%c', using 'b' instead."), size
);
868 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
877 if (format
== 's' || format
== 'i')
880 get_formatted_print_options (&opts
, format
);
882 /* Print as many objects as specified in COUNT, at most maxelts per line,
883 with the address of the next one at the start of each line. */
889 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
890 print_address (next_gdbarch
, next_address
, gdb_stdout
);
891 printf_filtered (":");
896 printf_filtered ("\t");
897 /* Note that print_formatted sets next_address for the next
899 last_examine_address
= next_address
;
901 if (last_examine_value
)
902 value_free (last_examine_value
);
904 /* The value to be displayed is not fetched greedily.
905 Instead, to avoid the possibility of a fetched value not
906 being used, its retrieval is delayed until the print code
907 uses it. When examining an instruction stream, the
908 disassembler will perform its own memory fetch using just
909 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
910 the disassembler be modified so that LAST_EXAMINE_VALUE
911 is left with the byte sequence from the last complete
912 instruction fetched from memory? */
913 last_examine_value
= value_at_lazy (val_type
, next_address
);
915 if (last_examine_value
)
916 release_value (last_examine_value
);
918 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
920 /* Display any branch delay slots following the final insn. */
921 if (format
== 'i' && count
== 1)
922 count
+= branch_delay_insns
;
924 printf_filtered ("\n");
925 gdb_flush (gdb_stdout
);
930 validate_format (struct format_data fmt
, const char *cmdname
)
933 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
935 error (_("Item count other than 1 is meaningless in \"%s\" command."),
937 if (fmt
.format
== 'i')
938 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
939 fmt
.format
, cmdname
);
942 /* Evaluate string EXP as an expression in the current language and
943 print the resulting value. EXP may contain a format specifier as the
944 first argument ("/x myvar" for example, to print myvar in hex). */
947 print_command_1 (const char *exp
, int voidprint
)
949 struct expression
*expr
;
950 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
953 struct format_data fmt
;
955 if (exp
&& *exp
== '/')
958 fmt
= decode_format (&exp
, last_format
, 0);
959 validate_format (fmt
, "print");
960 last_format
= format
= fmt
.format
;
972 expr
= parse_expression (exp
);
973 make_cleanup (free_current_contents
, &expr
);
974 val
= evaluate_expression (expr
);
977 val
= access_value_history (0);
979 if (voidprint
|| (val
&& value_type (val
) &&
980 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
982 struct value_print_options opts
;
983 int histindex
= record_latest_value (val
);
985 annotate_value_history_begin (histindex
, value_type (val
));
987 printf_filtered ("$%d = ", histindex
);
989 annotate_value_history_value ();
991 get_formatted_print_options (&opts
, format
);
994 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
995 printf_filtered ("\n");
997 annotate_value_history_end ();
1000 do_cleanups (old_chain
);
1004 print_command (char *exp
, int from_tty
)
1006 print_command_1 (exp
, 1);
1009 /* Same as print, except it doesn't print void results. */
1011 call_command (char *exp
, int from_tty
)
1013 print_command_1 (exp
, 0);
1016 /* Implementation of the "output" command. */
1019 output_command (char *exp
, int from_tty
)
1021 output_command_const (exp
, from_tty
);
1024 /* Like output_command, but takes a const string as argument. */
1027 output_command_const (const char *exp
, int from_tty
)
1029 struct expression
*expr
;
1030 struct cleanup
*old_chain
;
1033 struct format_data fmt
;
1034 struct value_print_options opts
;
1039 if (exp
&& *exp
== '/')
1042 fmt
= decode_format (&exp
, 0, 0);
1043 validate_format (fmt
, "output");
1044 format
= fmt
.format
;
1047 expr
= parse_expression (exp
);
1048 old_chain
= make_cleanup (free_current_contents
, &expr
);
1050 val
= evaluate_expression (expr
);
1052 annotate_value_begin (value_type (val
));
1054 get_formatted_print_options (&opts
, format
);
1056 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1058 annotate_value_end ();
1061 gdb_flush (gdb_stdout
);
1063 do_cleanups (old_chain
);
1067 set_command (char *exp
, int from_tty
)
1069 struct expression
*expr
= parse_expression (exp
);
1070 struct cleanup
*old_chain
=
1071 make_cleanup (free_current_contents
, &expr
);
1073 if (expr
->nelts
>= 1)
1074 switch (expr
->elts
[0].opcode
)
1076 case UNOP_PREINCREMENT
:
1077 case UNOP_POSTINCREMENT
:
1078 case UNOP_PREDECREMENT
:
1079 case UNOP_POSTDECREMENT
:
1081 case BINOP_ASSIGN_MODIFY
:
1086 (_("Expression is not an assignment (and might have no effect)"));
1089 evaluate_expression (expr
);
1090 do_cleanups (old_chain
);
1094 sym_info (char *arg
, int from_tty
)
1096 struct minimal_symbol
*msymbol
;
1097 struct objfile
*objfile
;
1098 struct obj_section
*osect
;
1099 CORE_ADDR addr
, sect_addr
;
1101 unsigned int offset
;
1104 error_no_arg (_("address"));
1106 addr
= parse_and_eval_address (arg
);
1107 ALL_OBJSECTIONS (objfile
, osect
)
1109 /* Only process each object file once, even if there's a separate
1111 if (objfile
->separate_debug_objfile_backlink
)
1114 sect_addr
= overlay_mapped_address (addr
, osect
);
1116 if (obj_section_addr (osect
) <= sect_addr
1117 && sect_addr
< obj_section_endaddr (osect
)
1119 = lookup_minimal_symbol_by_pc_section (sect_addr
, osect
).minsym
))
1121 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1123 struct cleanup
*old_chain
;
1126 offset
= sect_addr
- MSYMBOL_VALUE_ADDRESS (objfile
, msymbol
);
1127 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1128 sec_name
= osect
->the_bfd_section
->name
;
1129 msym_name
= MSYMBOL_PRINT_NAME (msymbol
);
1131 /* Don't print the offset if it is zero.
1132 We assume there's no need to handle i18n of "sym + offset". */
1134 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1136 loc_string
= xstrprintf ("%s", msym_name
);
1138 /* Use a cleanup to free loc_string in case the user quits
1139 a pagination request inside printf_filtered. */
1140 old_chain
= make_cleanup (xfree
, loc_string
);
1142 gdb_assert (osect
->objfile
&& objfile_name (osect
->objfile
));
1143 obj_name
= objfile_name (osect
->objfile
);
1145 if (MULTI_OBJFILE_P ())
1146 if (pc_in_unmapped_range (addr
, osect
))
1147 if (section_is_overlay (osect
))
1148 printf_filtered (_("%s in load address range of "
1149 "%s overlay section %s of %s\n"),
1150 loc_string
, mapped
, sec_name
, obj_name
);
1152 printf_filtered (_("%s in load address range of "
1153 "section %s of %s\n"),
1154 loc_string
, sec_name
, obj_name
);
1156 if (section_is_overlay (osect
))
1157 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1158 loc_string
, mapped
, sec_name
, obj_name
);
1160 printf_filtered (_("%s in section %s of %s\n"),
1161 loc_string
, sec_name
, obj_name
);
1163 if (pc_in_unmapped_range (addr
, osect
))
1164 if (section_is_overlay (osect
))
1165 printf_filtered (_("%s in load address range of %s overlay "
1167 loc_string
, mapped
, sec_name
);
1169 printf_filtered (_("%s in load address range of section %s\n"),
1170 loc_string
, sec_name
);
1172 if (section_is_overlay (osect
))
1173 printf_filtered (_("%s in %s overlay section %s\n"),
1174 loc_string
, mapped
, sec_name
);
1176 printf_filtered (_("%s in section %s\n"),
1177 loc_string
, sec_name
);
1179 do_cleanups (old_chain
);
1183 printf_filtered (_("No symbol matches %s.\n"), arg
);
1187 address_info (char *exp
, int from_tty
)
1189 struct gdbarch
*gdbarch
;
1192 struct bound_minimal_symbol msymbol
;
1194 struct obj_section
*section
;
1195 CORE_ADDR load_addr
, context_pc
= 0;
1196 struct field_of_this_result is_a_field_of_this
;
1199 error (_("Argument required."));
1201 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1202 &is_a_field_of_this
);
1205 if (is_a_field_of_this
.type
!= NULL
)
1207 printf_filtered ("Symbol \"");
1208 fprintf_symbol_filtered (gdb_stdout
, exp
,
1209 current_language
->la_language
, DMGL_ANSI
);
1210 printf_filtered ("\" is a field of the local class variable ");
1211 if (current_language
->la_language
== language_objc
)
1212 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1214 printf_filtered ("`this'\n");
1218 msymbol
= lookup_bound_minimal_symbol (exp
);
1220 if (msymbol
.minsym
!= NULL
)
1222 struct objfile
*objfile
= msymbol
.objfile
;
1224 gdbarch
= get_objfile_arch (objfile
);
1225 load_addr
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
1227 printf_filtered ("Symbol \"");
1228 fprintf_symbol_filtered (gdb_stdout
, exp
,
1229 current_language
->la_language
, DMGL_ANSI
);
1230 printf_filtered ("\" is at ");
1231 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1232 printf_filtered (" in a file compiled without debugging");
1233 section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
.minsym
);
1234 if (section_is_overlay (section
))
1236 load_addr
= overlay_unmapped_address (load_addr
, section
);
1237 printf_filtered (",\n -- loaded at ");
1238 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1239 printf_filtered (" in overlay section %s",
1240 section
->the_bfd_section
->name
);
1242 printf_filtered (".\n");
1245 error (_("No symbol \"%s\" in current context."), exp
);
1249 printf_filtered ("Symbol \"");
1250 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1251 current_language
->la_language
, DMGL_ANSI
);
1252 printf_filtered ("\" is ");
1253 val
= SYMBOL_VALUE (sym
);
1254 if (SYMBOL_OBJFILE_OWNED (sym
))
1255 section
= SYMBOL_OBJ_SECTION (symbol_objfile (sym
), sym
);
1258 gdbarch
= symbol_arch (sym
);
1260 if (SYMBOL_COMPUTED_OPS (sym
) != NULL
)
1262 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1264 printf_filtered (".\n");
1268 switch (SYMBOL_CLASS (sym
))
1271 case LOC_CONST_BYTES
:
1272 printf_filtered ("constant");
1276 printf_filtered ("a label at address ");
1277 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1278 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1279 if (section_is_overlay (section
))
1281 load_addr
= overlay_unmapped_address (load_addr
, section
);
1282 printf_filtered (",\n -- loaded at ");
1283 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1284 printf_filtered (" in overlay section %s",
1285 section
->the_bfd_section
->name
);
1290 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1293 /* GDBARCH is the architecture associated with the objfile the symbol
1294 is defined in; the target architecture may be different, and may
1295 provide additional registers. However, we do not know the target
1296 architecture at this point. We assume the objfile architecture
1297 will contain all the standard registers that occur in debug info
1299 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1301 if (SYMBOL_IS_ARGUMENT (sym
))
1302 printf_filtered (_("an argument in register %s"),
1303 gdbarch_register_name (gdbarch
, regno
));
1305 printf_filtered (_("a variable in register %s"),
1306 gdbarch_register_name (gdbarch
, regno
));
1310 printf_filtered (_("static storage at address "));
1311 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1312 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1313 if (section_is_overlay (section
))
1315 load_addr
= overlay_unmapped_address (load_addr
, section
);
1316 printf_filtered (_(",\n -- loaded at "));
1317 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1318 printf_filtered (_(" in overlay section %s"),
1319 section
->the_bfd_section
->name
);
1323 case LOC_REGPARM_ADDR
:
1324 /* Note comment at LOC_REGISTER. */
1325 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1326 printf_filtered (_("address of an argument in register %s"),
1327 gdbarch_register_name (gdbarch
, regno
));
1331 printf_filtered (_("an argument at offset %ld"), val
);
1335 printf_filtered (_("a local variable at frame offset %ld"), val
);
1339 printf_filtered (_("a reference argument at offset %ld"), val
);
1343 printf_filtered (_("a typedef"));
1347 printf_filtered (_("a function at address "));
1348 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1349 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1350 if (section_is_overlay (section
))
1352 load_addr
= overlay_unmapped_address (load_addr
, section
);
1353 printf_filtered (_(",\n -- loaded at "));
1354 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1355 printf_filtered (_(" in overlay section %s"),
1356 section
->the_bfd_section
->name
);
1360 case LOC_UNRESOLVED
:
1362 struct bound_minimal_symbol msym
;
1364 msym
= lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym
));
1365 if (msym
.minsym
== NULL
)
1366 printf_filtered ("unresolved");
1369 section
= MSYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
);
1370 load_addr
= BMSYMBOL_VALUE_ADDRESS (msym
);
1373 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1374 printf_filtered (_("a thread-local variable at offset %s "
1375 "in the thread-local storage for `%s'"),
1376 paddress (gdbarch
, load_addr
),
1377 objfile_name (section
->objfile
));
1380 printf_filtered (_("static storage at address "));
1381 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1382 if (section_is_overlay (section
))
1384 load_addr
= overlay_unmapped_address (load_addr
, section
);
1385 printf_filtered (_(",\n -- loaded at "));
1386 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1387 printf_filtered (_(" in overlay section %s"),
1388 section
->the_bfd_section
->name
);
1395 case LOC_OPTIMIZED_OUT
:
1396 printf_filtered (_("optimized out"));
1400 printf_filtered (_("of unknown (botched) type"));
1403 printf_filtered (".\n");
1408 x_command (char *exp
, int from_tty
)
1410 struct expression
*expr
;
1411 struct format_data fmt
;
1412 struct cleanup
*old_chain
;
1415 fmt
.format
= last_format
? last_format
: 'x';
1416 fmt
.size
= last_size
;
1420 if (exp
&& *exp
== '/')
1422 const char *tmp
= exp
+ 1;
1424 fmt
= decode_format (&tmp
, last_format
, last_size
);
1428 /* If we have an expression, evaluate it and use it as the address. */
1430 if (exp
!= 0 && *exp
!= 0)
1432 expr
= parse_expression (exp
);
1433 /* Cause expression not to be there any more if this command is
1434 repeated with Newline. But don't clobber a user-defined
1435 command's definition. */
1438 old_chain
= make_cleanup (free_current_contents
, &expr
);
1439 val
= evaluate_expression (expr
);
1440 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1441 val
= coerce_ref (val
);
1442 /* In rvalue contexts, such as this, functions are coerced into
1443 pointers to functions. This makes "x/i main" work. */
1444 if (/* last_format == 'i' && */
1445 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1446 && VALUE_LVAL (val
) == lval_memory
)
1447 next_address
= value_address (val
);
1449 next_address
= value_as_address (val
);
1451 next_gdbarch
= expr
->gdbarch
;
1452 do_cleanups (old_chain
);
1456 error_no_arg (_("starting display address"));
1458 do_examine (fmt
, next_gdbarch
, next_address
);
1460 /* If the examine succeeds, we remember its size and format for next
1461 time. Set last_size to 'b' for strings. */
1462 if (fmt
.format
== 's')
1465 last_size
= fmt
.size
;
1466 last_format
= fmt
.format
;
1468 /* Set a couple of internal variables if appropriate. */
1469 if (last_examine_value
)
1471 /* Make last address examined available to the user as $_. Use
1472 the correct pointer type. */
1473 struct type
*pointer_type
1474 = lookup_pointer_type (value_type (last_examine_value
));
1475 set_internalvar (lookup_internalvar ("_"),
1476 value_from_pointer (pointer_type
,
1477 last_examine_address
));
1479 /* Make contents of last address examined available to the user
1480 as $__. If the last value has not been fetched from memory
1481 then don't fetch it now; instead mark it by voiding the $__
1483 if (value_lazy (last_examine_value
))
1484 clear_internalvar (lookup_internalvar ("__"));
1486 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1491 /* Add an expression to the auto-display chain.
1492 Specify the expression. */
1495 display_command (char *arg
, int from_tty
)
1497 struct format_data fmt
;
1498 struct expression
*expr
;
1499 struct display
*newobj
;
1501 const char *exp
= arg
;
1504 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1506 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1507 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1521 fmt
= decode_format (&exp
, 0, 0);
1522 if (fmt
.size
&& fmt
.format
== 0)
1524 if (fmt
.format
== 'i' || fmt
.format
== 's')
1535 innermost_block
= NULL
;
1536 expr
= parse_expression (exp
);
1538 newobj
= (struct display
*) xmalloc (sizeof (struct display
));
1540 newobj
->exp_string
= xstrdup (exp
);
1542 newobj
->block
= innermost_block
;
1543 newobj
->pspace
= current_program_space
;
1544 newobj
->next
= display_chain
;
1545 newobj
->number
= ++display_number
;
1546 newobj
->format
= fmt
;
1547 newobj
->enabled_p
= 1;
1548 display_chain
= newobj
;
1551 do_one_display (newobj
);
1558 free_display (struct display
*d
)
1560 xfree (d
->exp_string
);
1565 /* Clear out the display_chain. Done when new symtabs are loaded,
1566 since this invalidates the types stored in many expressions. */
1569 clear_displays (void)
1573 while ((d
= display_chain
) != NULL
)
1575 display_chain
= d
->next
;
1580 /* Delete the auto-display DISPLAY. */
1583 delete_display (struct display
*display
)
1587 gdb_assert (display
!= NULL
);
1589 if (display_chain
== display
)
1590 display_chain
= display
->next
;
1593 if (d
->next
== display
)
1595 d
->next
= display
->next
;
1599 free_display (display
);
1602 /* Call FUNCTION on each of the displays whose numbers are given in
1603 ARGS. DATA is passed unmodified to FUNCTION. */
1606 map_display_numbers (char *args
,
1607 void (*function
) (struct display
*,
1611 struct get_number_or_range_state state
;
1615 error_no_arg (_("one or more display numbers"));
1617 init_number_or_range (&state
, args
);
1619 while (!state
.finished
)
1621 const char *p
= state
.string
;
1623 num
= get_number_or_range (&state
);
1625 warning (_("bad display number at or near '%s'"), p
);
1628 struct display
*d
, *tmp
;
1630 ALL_DISPLAYS_SAFE (d
, tmp
)
1631 if (d
->number
== num
)
1634 printf_unfiltered (_("No display number %d.\n"), num
);
1641 /* Callback for map_display_numbers, that deletes a display. */
1644 do_delete_display (struct display
*d
, void *data
)
1649 /* "undisplay" command. */
1652 undisplay_command (char *args
, int from_tty
)
1656 if (query (_("Delete all auto-display expressions? ")))
1662 map_display_numbers (args
, do_delete_display
, NULL
);
1666 /* Display a single auto-display.
1667 Do nothing if the display cannot be printed in the current context,
1668 or if the display is disabled. */
1671 do_one_display (struct display
*d
)
1673 struct cleanup
*old_chain
;
1674 int within_current_scope
;
1676 if (d
->enabled_p
== 0)
1679 /* The expression carries the architecture that was used at parse time.
1680 This is a problem if the expression depends on architecture features
1681 (e.g. register numbers), and the current architecture is now different.
1682 For example, a display statement like "display/i $pc" is expected to
1683 display the PC register of the current architecture, not the arch at
1684 the time the display command was given. Therefore, we re-parse the
1685 expression if the current architecture has changed. */
1686 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1698 innermost_block
= NULL
;
1699 d
->exp
= parse_expression (d
->exp_string
);
1700 d
->block
= innermost_block
;
1702 CATCH (ex
, RETURN_MASK_ALL
)
1704 /* Can't re-parse the expression. Disable this display item. */
1706 warning (_("Unable to display \"%s\": %s"),
1707 d
->exp_string
, ex
.message
);
1715 if (d
->pspace
== current_program_space
)
1716 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1718 within_current_scope
= 0;
1721 within_current_scope
= 1;
1722 if (!within_current_scope
)
1725 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1726 current_display_number
= d
->number
;
1728 annotate_display_begin ();
1729 printf_filtered ("%d", d
->number
);
1730 annotate_display_number_end ();
1731 printf_filtered (": ");
1735 annotate_display_format ();
1737 printf_filtered ("x/");
1738 if (d
->format
.count
!= 1)
1739 printf_filtered ("%d", d
->format
.count
);
1740 printf_filtered ("%c", d
->format
.format
);
1741 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1742 printf_filtered ("%c", d
->format
.size
);
1743 printf_filtered (" ");
1745 annotate_display_expression ();
1747 puts_filtered (d
->exp_string
);
1748 annotate_display_expression_end ();
1750 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1751 printf_filtered ("\n");
1753 printf_filtered (" ");
1755 annotate_display_value ();
1762 val
= evaluate_expression (d
->exp
);
1763 addr
= value_as_address (val
);
1764 if (d
->format
.format
== 'i')
1765 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1766 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1768 CATCH (ex
, RETURN_MASK_ERROR
)
1770 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1776 struct value_print_options opts
;
1778 annotate_display_format ();
1780 if (d
->format
.format
)
1781 printf_filtered ("/%c ", d
->format
.format
);
1783 annotate_display_expression ();
1785 puts_filtered (d
->exp_string
);
1786 annotate_display_expression_end ();
1788 printf_filtered (" = ");
1790 annotate_display_expression ();
1792 get_formatted_print_options (&opts
, d
->format
.format
);
1793 opts
.raw
= d
->format
.raw
;
1799 val
= evaluate_expression (d
->exp
);
1800 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1802 CATCH (ex
, RETURN_MASK_ERROR
)
1804 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1808 printf_filtered ("\n");
1811 annotate_display_end ();
1813 gdb_flush (gdb_stdout
);
1814 do_cleanups (old_chain
);
1817 /* Display all of the values on the auto-display chain which can be
1818 evaluated in the current scope. */
1825 for (d
= display_chain
; d
; d
= d
->next
)
1829 /* Delete the auto-display which we were in the process of displaying.
1830 This is done when there is an error or a signal. */
1833 disable_display (int num
)
1837 for (d
= display_chain
; d
; d
= d
->next
)
1838 if (d
->number
== num
)
1843 printf_unfiltered (_("No display number %d.\n"), num
);
1847 disable_current_display (void)
1849 if (current_display_number
>= 0)
1851 disable_display (current_display_number
);
1852 fprintf_unfiltered (gdb_stderr
,
1853 _("Disabling display %d to "
1854 "avoid infinite recursion.\n"),
1855 current_display_number
);
1857 current_display_number
= -1;
1861 display_info (char *ignore
, int from_tty
)
1866 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1868 printf_filtered (_("Auto-display expressions now in effect:\n\
1869 Num Enb Expression\n"));
1871 for (d
= display_chain
; d
; d
= d
->next
)
1873 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1875 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1877 else if (d
->format
.format
)
1878 printf_filtered ("/%c ", d
->format
.format
);
1879 puts_filtered (d
->exp_string
);
1880 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1881 printf_filtered (_(" (cannot be evaluated in the current context)"));
1882 printf_filtered ("\n");
1883 gdb_flush (gdb_stdout
);
1887 /* Callback fo map_display_numbers, that enables or disables the
1888 passed in display D. */
1891 do_enable_disable_display (struct display
*d
, void *data
)
1893 d
->enabled_p
= *(int *) data
;
1896 /* Implamentation of both the "disable display" and "enable display"
1897 commands. ENABLE decides what to do. */
1900 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1907 d
->enabled_p
= enable
;
1911 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1914 /* The "enable display" command. */
1917 enable_display_command (char *args
, int from_tty
)
1919 enable_disable_display_command (args
, from_tty
, 1);
1922 /* The "disable display" command. */
1925 disable_display_command (char *args
, int from_tty
)
1927 enable_disable_display_command (args
, from_tty
, 0);
1930 /* display_chain items point to blocks and expressions. Some expressions in
1931 turn may point to symbols.
1932 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1933 obstack_free'd when a shared library is unloaded.
1934 Clear pointers that are about to become dangling.
1935 Both .exp and .block fields will be restored next time we need to display
1936 an item by re-parsing .exp_string field in the new execution context. */
1939 clear_dangling_display_expressions (struct objfile
*objfile
)
1942 struct program_space
*pspace
;
1944 /* With no symbol file we cannot have a block or expression from it. */
1945 if (objfile
== NULL
)
1947 pspace
= objfile
->pspace
;
1948 if (objfile
->separate_debug_objfile_backlink
)
1950 objfile
= objfile
->separate_debug_objfile_backlink
;
1951 gdb_assert (objfile
->pspace
== pspace
);
1954 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1956 if (d
->pspace
!= pspace
)
1959 if (lookup_objfile_from_block (d
->block
) == objfile
1960 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1970 /* Print the value in stack frame FRAME of a variable specified by a
1971 struct symbol. NAME is the name to print; if NULL then VAR's print
1972 name will be used. STREAM is the ui_file on which to print the
1973 value. INDENT specifies the number of indent levels to print
1974 before printing the variable name.
1976 This function invalidates FRAME. */
1979 print_variable_and_value (const char *name
, struct symbol
*var
,
1980 struct frame_info
*frame
,
1981 struct ui_file
*stream
, int indent
)
1985 name
= SYMBOL_PRINT_NAME (var
);
1987 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1991 struct value_print_options opts
;
1993 val
= read_var_value (var
, frame
);
1994 get_user_print_options (&opts
);
1996 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1998 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2002 CATCH (except
, RETURN_MASK_ERROR
)
2004 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."));