1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "gdb_string.h"
27 #include "expression.h"
31 #include "breakpoint.h"
33 #include "gdb-demangle.h"
36 #include "symfile.h" /* for overlay functions */
37 #include "objfiles.h" /* ditto */
38 #include "completer.h" /* for completion functions */
40 #include "gdb_assert.h"
45 #include "exceptions.h"
48 #include "parser-defs.h"
50 #include "arch-utils.h"
51 #include "cli/cli-utils.h"
56 #include "tui/tui.h" /* For tui_active et al. */
65 /* True if the value should be printed raw -- that is, bypassing
66 python-based formatters. */
70 /* Last specified output format. */
72 static char last_format
= 0;
74 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
76 static char last_size
= 'w';
78 /* Default address to examine next, and associated architecture. */
80 static struct gdbarch
*next_gdbarch
;
81 static CORE_ADDR next_address
;
83 /* Number of delay instructions following current disassembled insn. */
85 static int branch_delay_insns
;
87 /* Last address examined. */
89 static CORE_ADDR last_examine_address
;
91 /* Contents of last address examined.
92 This is not valid past the end of the `x' command! */
94 static struct value
*last_examine_value
;
96 /* Largest offset between a symbolic value and an address, that will be
97 printed as `0x1234 <symbol+offset>'. */
99 static unsigned int max_symbolic_offset
= UINT_MAX
;
101 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
102 struct cmd_list_element
*c
, const char *value
)
104 fprintf_filtered (file
,
105 _("The largest offset that will be "
106 "printed in <symbol+1234> form is %s.\n"),
110 /* Append the source filename and linenumber of the symbol when
111 printing a symbolic value as `<symbol at filename:linenum>' if set. */
112 static int print_symbol_filename
= 0;
114 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
115 struct cmd_list_element
*c
, const char *value
)
117 fprintf_filtered (file
, _("Printing of source filename and "
118 "line number with <symbol> is %s.\n"),
122 /* Number of auto-display expression currently being displayed.
123 So that we can disable it if we get a signal within it.
124 -1 when not doing one. */
126 static int current_display_number
;
130 /* Chain link to next auto-display item. */
131 struct display
*next
;
133 /* The expression as the user typed it. */
136 /* Expression to be evaluated and displayed. */
137 struct expression
*exp
;
139 /* Item number of this auto-display item. */
142 /* Display format specified. */
143 struct format_data format
;
145 /* Program space associated with `block'. */
146 struct program_space
*pspace
;
148 /* Innermost block required by this expression when evaluated. */
149 const struct block
*block
;
151 /* Status of this display (enabled or disabled). */
155 /* Chain of expressions whose values should be displayed
156 automatically each time the program stops. */
158 static struct display
*display_chain
;
160 static int display_number
;
162 /* Walk the following statement or block through all displays.
163 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
166 #define ALL_DISPLAYS(B) \
167 for (B = display_chain; B; B = B->next)
169 #define ALL_DISPLAYS_SAFE(B,TMP) \
170 for (B = display_chain; \
171 B ? (TMP = B->next, 1): 0; \
174 /* Prototypes for exported functions. */
176 void _initialize_printcmd (void);
178 /* Prototypes for local functions. */
180 static void do_one_display (struct display
*);
183 /* Decode a format specification. *STRING_PTR should point to it.
184 OFORMAT and OSIZE are used as defaults for the format and size
185 if none are given in the format specification.
186 If OSIZE is zero, then the size field of the returned value
187 should be set only if a size is explicitly specified by the
189 The structure returned describes all the data
190 found in the specification. In addition, *STRING_PTR is advanced
191 past the specification and past all whitespace following it. */
193 static struct format_data
194 decode_format (const char **string_ptr
, int oformat
, int osize
)
196 struct format_data val
;
197 const char *p
= *string_ptr
;
204 if (*p
>= '0' && *p
<= '9')
205 val
.count
= atoi (p
);
206 while (*p
>= '0' && *p
<= '9')
209 /* Now process size or format letters that follow. */
213 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
220 else if (*p
>= 'a' && *p
<= 'z')
226 while (*p
== ' ' || *p
== '\t')
230 /* Set defaults for format and size if not specified. */
231 if (val
.format
== '?')
235 /* Neither has been specified. */
236 val
.format
= oformat
;
240 /* If a size is specified, any format makes a reasonable
241 default except 'i'. */
242 val
.format
= oformat
== 'i' ? 'x' : oformat
;
244 else if (val
.size
== '?')
248 /* Pick the appropriate size for an address. This is deferred
249 until do_examine when we know the actual architecture to use.
250 A special size value of 'a' is used to indicate this case. */
251 val
.size
= osize
? 'a' : osize
;
254 /* Floating point has to be word or giantword. */
255 if (osize
== 'w' || osize
== 'g')
258 /* Default it to giantword if the last used size is not
260 val
.size
= osize
? 'g' : osize
;
263 /* Characters default to one byte. */
264 val
.size
= osize
? 'b' : osize
;
267 /* Display strings with byte size chars unless explicitly
273 /* The default is the size most recently specified. */
280 /* Print value VAL on stream according to OPTIONS.
281 Do not end with a newline.
282 SIZE is the letter for the size of datum being printed.
283 This is used to pad hex numbers so they line up. SIZE is 0
284 for print / output and set for examine. */
287 print_formatted (struct value
*val
, int size
,
288 const struct value_print_options
*options
,
289 struct ui_file
*stream
)
291 struct type
*type
= check_typedef (value_type (val
));
292 int len
= TYPE_LENGTH (type
);
294 if (VALUE_LVAL (val
) == lval_memory
)
295 next_address
= value_address (val
) + len
;
299 switch (options
->format
)
303 struct type
*elttype
= value_type (val
);
305 next_address
= (value_address (val
)
306 + val_print_string (elttype
, NULL
,
307 value_address (val
), -1,
308 stream
, options
) * len
);
313 /* We often wrap here if there are long symbolic names. */
315 next_address
= (value_address (val
)
316 + gdb_print_insn (get_type_arch (type
),
317 value_address (val
), stream
,
318 &branch_delay_insns
));
323 if (options
->format
== 0 || options
->format
== 's'
324 || TYPE_CODE (type
) == TYPE_CODE_REF
325 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
326 || TYPE_CODE (type
) == TYPE_CODE_STRING
327 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
328 || TYPE_CODE (type
) == TYPE_CODE_UNION
329 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
330 value_print (val
, stream
, options
);
332 /* User specified format, so don't look to the type to tell us
334 val_print_scalar_formatted (type
,
335 value_contents_for_printing (val
),
336 value_embedded_offset (val
),
338 options
, size
, stream
);
341 /* Return builtin floating point type of same length as TYPE.
342 If no such type is found, return TYPE itself. */
344 float_type_from_length (struct type
*type
)
346 struct gdbarch
*gdbarch
= get_type_arch (type
);
347 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
349 if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_float
))
350 type
= builtin
->builtin_float
;
351 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_double
))
352 type
= builtin
->builtin_double
;
353 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_long_double
))
354 type
= builtin
->builtin_long_double
;
359 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
360 according to OPTIONS and SIZE on STREAM. Formats s and i are not
361 supported at this level. */
364 print_scalar_formatted (const void *valaddr
, struct type
*type
,
365 const struct value_print_options
*options
,
366 int size
, struct ui_file
*stream
)
368 struct gdbarch
*gdbarch
= get_type_arch (type
);
369 LONGEST val_long
= 0;
370 unsigned int len
= TYPE_LENGTH (type
);
371 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
373 /* String printing should go through val_print_scalar_formatted. */
374 gdb_assert (options
->format
!= 's');
376 if (len
> sizeof(LONGEST
) &&
377 (TYPE_CODE (type
) == TYPE_CODE_INT
378 || TYPE_CODE (type
) == TYPE_CODE_ENUM
))
380 switch (options
->format
)
383 print_octal_chars (stream
, valaddr
, len
, byte_order
);
387 print_decimal_chars (stream
, valaddr
, len
, byte_order
);
390 print_binary_chars (stream
, valaddr
, len
, byte_order
);
393 print_hex_chars (stream
, valaddr
, len
, byte_order
);
396 print_char_chars (stream
, type
, valaddr
, len
, byte_order
);
403 if (options
->format
!= 'f')
404 val_long
= unpack_long (type
, valaddr
);
406 /* If the value is a pointer, and pointers and addresses are not the
407 same, then at this point, the value's length (in target bytes) is
408 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
409 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
410 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
412 /* If we are printing it as unsigned, truncate it in case it is actually
413 a negative signed value (e.g. "print/u (short)-1" should print 65535
414 (if shorts are 16 bits) instead of 4294967295). */
415 if (options
->format
!= 'd' || TYPE_UNSIGNED (type
))
417 if (len
< sizeof (LONGEST
))
418 val_long
&= ((LONGEST
) 1 << HOST_CHAR_BIT
* len
) - 1;
421 switch (options
->format
)
426 /* No size specified, like in print. Print varying # of digits. */
427 print_longest (stream
, 'x', 1, val_long
);
436 print_longest (stream
, size
, 1, val_long
);
439 error (_("Undefined output size \"%c\"."), size
);
444 print_longest (stream
, 'd', 1, val_long
);
448 print_longest (stream
, 'u', 0, val_long
);
453 print_longest (stream
, 'o', 1, val_long
);
455 fprintf_filtered (stream
, "0");
460 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
462 print_address (gdbarch
, addr
, stream
);
468 struct value_print_options opts
= *options
;
471 if (TYPE_UNSIGNED (type
))
472 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
474 type
= builtin_type (gdbarch
)->builtin_true_char
;
476 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
481 type
= float_type_from_length (type
);
482 print_floating (valaddr
, type
, stream
);
486 internal_error (__FILE__
, __LINE__
,
487 _("failed internal consistency check"));
490 /* Binary; 't' stands for "two". */
492 char bits
[8 * (sizeof val_long
) + 1];
493 char buf
[8 * (sizeof val_long
) + 32];
498 width
= 8 * (sizeof val_long
);
515 error (_("Undefined output size \"%c\"."), size
);
521 bits
[width
] = (val_long
& 1) ? '1' : '0';
526 while (*cp
&& *cp
== '0')
531 strncpy (buf
, cp
, sizeof (bits
));
532 fputs_filtered (buf
, stream
);
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 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
);
681 && MSYMBOL_HAS_SIZE (msymbol
)
682 && MSYMBOL_SIZE (msymbol
) == 0
683 && MSYMBOL_TYPE (msymbol
) != mst_text
684 && MSYMBOL_TYPE (msymbol
) != mst_text_gnu_ifunc
685 && MSYMBOL_TYPE (msymbol
) != mst_file_text
)
690 if (SYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
692 /* The msymbol is closer to the address than the symbol;
693 use the msymbol instead. */
695 name_location
= SYMBOL_VALUE_ADDRESS (msymbol
);
696 if (do_demangle
|| asm_demangle
)
697 name_temp
= SYMBOL_PRINT_NAME (msymbol
);
699 name_temp
= SYMBOL_LINKAGE_NAME (msymbol
);
702 if (symbol
== NULL
&& msymbol
== NULL
)
705 /* If the nearest symbol is too far away, don't print anything symbolic. */
707 /* For when CORE_ADDR is larger than unsigned int, we do math in
708 CORE_ADDR. But when we detect unsigned wraparound in the
709 CORE_ADDR math, we ignore this test and print the offset,
710 because addr+max_symbolic_offset has wrapped through the end
711 of the address space back to the beginning, giving bogus comparison. */
712 if (addr
> name_location
+ max_symbolic_offset
713 && name_location
+ max_symbolic_offset
> name_location
)
716 *offset
= addr
- name_location
;
718 *name
= xstrdup (name_temp
);
720 if (print_symbol_filename
)
722 struct symtab_and_line sal
;
724 sal
= find_pc_sect_line (addr
, section
, 0);
728 *filename
= xstrdup (symtab_to_filename_for_display (sal
.symtab
));
736 /* Print address ADDR symbolically on STREAM.
737 First print it as a number. Then perhaps print
738 <SYMBOL + OFFSET> after the number. */
741 print_address (struct gdbarch
*gdbarch
,
742 CORE_ADDR addr
, struct ui_file
*stream
)
744 fputs_filtered (paddress (gdbarch
, addr
), stream
);
745 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
748 /* Return a prefix for instruction address:
749 "=> " for current instruction, else " ". */
752 pc_prefix (CORE_ADDR addr
)
754 if (has_stack_frames ())
756 struct frame_info
*frame
;
759 frame
= get_selected_frame (NULL
);
760 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
766 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
767 controls whether to print the symbolic name "raw" or demangled.
768 Return non-zero if anything was printed; zero otherwise. */
771 print_address_demangle (const struct value_print_options
*opts
,
772 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
773 struct ui_file
*stream
, int do_demangle
)
775 if (opts
->addressprint
)
777 fputs_filtered (paddress (gdbarch
, addr
), stream
);
778 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
782 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
788 /* Examine data at address ADDR in format FMT.
789 Fetch it from memory and print on gdb_stdout. */
792 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
797 struct type
*val_type
= NULL
;
800 struct value_print_options opts
;
805 next_gdbarch
= gdbarch
;
808 /* Instruction format implies fetch single bytes
809 regardless of the specified size.
810 The case of strings is handled in decode_format, only explicit
811 size operator are not changed to 'b'. */
817 /* Pick the appropriate size for an address. */
818 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
820 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
822 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
825 /* Bad value for gdbarch_ptr_bit. */
826 internal_error (__FILE__
, __LINE__
,
827 _("failed internal consistency check"));
831 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
832 else if (size
== 'h')
833 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
834 else if (size
== 'w')
835 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
836 else if (size
== 'g')
837 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
841 struct type
*char_type
= NULL
;
843 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
844 if type is not found. */
846 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
847 else if (size
== 'w')
848 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
850 val_type
= char_type
;
853 if (size
!= '\0' && size
!= 'b')
854 warning (_("Unable to display strings with "
855 "size '%c', using 'b' instead."), size
);
857 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
866 if (format
== 's' || format
== 'i')
869 get_formatted_print_options (&opts
, format
);
871 /* Print as many objects as specified in COUNT, at most maxelts per line,
872 with the address of the next one at the start of each line. */
878 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
879 print_address (next_gdbarch
, next_address
, gdb_stdout
);
880 printf_filtered (":");
885 printf_filtered ("\t");
886 /* Note that print_formatted sets next_address for the next
888 last_examine_address
= next_address
;
890 if (last_examine_value
)
891 value_free (last_examine_value
);
893 /* The value to be displayed is not fetched greedily.
894 Instead, to avoid the possibility of a fetched value not
895 being used, its retrieval is delayed until the print code
896 uses it. When examining an instruction stream, the
897 disassembler will perform its own memory fetch using just
898 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
899 the disassembler be modified so that LAST_EXAMINE_VALUE
900 is left with the byte sequence from the last complete
901 instruction fetched from memory? */
902 last_examine_value
= value_at_lazy (val_type
, next_address
);
904 if (last_examine_value
)
905 release_value (last_examine_value
);
907 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
909 /* Display any branch delay slots following the final insn. */
910 if (format
== 'i' && count
== 1)
911 count
+= branch_delay_insns
;
913 printf_filtered ("\n");
914 gdb_flush (gdb_stdout
);
919 validate_format (struct format_data fmt
, char *cmdname
)
922 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
924 error (_("Item count other than 1 is meaningless in \"%s\" command."),
926 if (fmt
.format
== 'i')
927 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
928 fmt
.format
, cmdname
);
931 /* Evaluate string EXP as an expression in the current language and
932 print the resulting value. EXP may contain a format specifier as the
933 first argument ("/x myvar" for example, to print myvar in hex). */
936 print_command_1 (const char *exp
, int voidprint
)
938 struct expression
*expr
;
939 struct cleanup
*old_chain
= 0;
942 struct format_data fmt
;
945 if (exp
&& *exp
== '/')
948 fmt
= decode_format (&exp
, last_format
, 0);
949 validate_format (fmt
, "print");
950 last_format
= format
= fmt
.format
;
962 expr
= parse_expression (exp
);
963 old_chain
= make_cleanup (free_current_contents
, &expr
);
965 val
= evaluate_expression (expr
);
968 val
= access_value_history (0);
970 if (voidprint
|| (val
&& value_type (val
) &&
971 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
973 struct value_print_options opts
;
974 int histindex
= record_latest_value (val
);
977 annotate_value_history_begin (histindex
, value_type (val
));
979 annotate_value_begin (value_type (val
));
982 printf_filtered ("$%d = ", histindex
);
985 annotate_value_history_value ();
987 get_formatted_print_options (&opts
, format
);
990 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
991 printf_filtered ("\n");
994 annotate_value_history_end ();
996 annotate_value_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
)
1118 && (msymbol
= lookup_minimal_symbol_by_pc_section (sect_addr
, osect
)))
1120 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1122 struct cleanup
*old_chain
;
1125 offset
= sect_addr
- SYMBOL_VALUE_ADDRESS (msymbol
);
1126 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1127 sec_name
= osect
->the_bfd_section
->name
;
1128 msym_name
= SYMBOL_PRINT_NAME (msymbol
);
1130 /* Don't print the offset if it is zero.
1131 We assume there's no need to handle i18n of "sym + offset". */
1133 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1135 loc_string
= xstrprintf ("%s", msym_name
);
1137 /* Use a cleanup to free loc_string in case the user quits
1138 a pagination request inside printf_filtered. */
1139 old_chain
= make_cleanup (xfree
, loc_string
);
1141 gdb_assert (osect
->objfile
&& osect
->objfile
->name
);
1142 obj_name
= osect
->objfile
->name
;
1144 if (MULTI_OBJFILE_P ())
1145 if (pc_in_unmapped_range (addr
, osect
))
1146 if (section_is_overlay (osect
))
1147 printf_filtered (_("%s in load address range of "
1148 "%s overlay section %s of %s\n"),
1149 loc_string
, mapped
, sec_name
, obj_name
);
1151 printf_filtered (_("%s in load address range of "
1152 "section %s of %s\n"),
1153 loc_string
, sec_name
, obj_name
);
1155 if (section_is_overlay (osect
))
1156 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1157 loc_string
, mapped
, sec_name
, obj_name
);
1159 printf_filtered (_("%s in section %s of %s\n"),
1160 loc_string
, sec_name
, obj_name
);
1162 if (pc_in_unmapped_range (addr
, osect
))
1163 if (section_is_overlay (osect
))
1164 printf_filtered (_("%s in load address range of %s overlay "
1166 loc_string
, mapped
, sec_name
);
1168 printf_filtered (_("%s in load address range of section %s\n"),
1169 loc_string
, sec_name
);
1171 if (section_is_overlay (osect
))
1172 printf_filtered (_("%s in %s overlay section %s\n"),
1173 loc_string
, mapped
, sec_name
);
1175 printf_filtered (_("%s in section %s\n"),
1176 loc_string
, sec_name
);
1178 do_cleanups (old_chain
);
1182 printf_filtered (_("No symbol matches %s.\n"), arg
);
1186 address_info (char *exp
, int from_tty
)
1188 struct gdbarch
*gdbarch
;
1191 struct minimal_symbol
*msymbol
;
1193 struct obj_section
*section
;
1194 CORE_ADDR load_addr
, context_pc
= 0;
1195 struct field_of_this_result is_a_field_of_this
;
1198 error (_("Argument required."));
1200 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1201 &is_a_field_of_this
);
1204 if (is_a_field_of_this
.type
!= NULL
)
1206 printf_filtered ("Symbol \"");
1207 fprintf_symbol_filtered (gdb_stdout
, exp
,
1208 current_language
->la_language
, DMGL_ANSI
);
1209 printf_filtered ("\" is a field of the local class variable ");
1210 if (current_language
->la_language
== language_objc
)
1211 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1213 printf_filtered ("`this'\n");
1217 msymbol
= lookup_minimal_symbol (exp
, NULL
, NULL
);
1219 if (msymbol
!= NULL
)
1221 gdbarch
= get_objfile_arch (msymbol_objfile (msymbol
));
1222 load_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1224 printf_filtered ("Symbol \"");
1225 fprintf_symbol_filtered (gdb_stdout
, exp
,
1226 current_language
->la_language
, DMGL_ANSI
);
1227 printf_filtered ("\" is at ");
1228 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1229 printf_filtered (" in a file compiled without debugging");
1230 section
= SYMBOL_OBJ_SECTION (msymbol
);
1231 if (section_is_overlay (section
))
1233 load_addr
= overlay_unmapped_address (load_addr
, section
);
1234 printf_filtered (",\n -- loaded at ");
1235 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1236 printf_filtered (" in overlay section %s",
1237 section
->the_bfd_section
->name
);
1239 printf_filtered (".\n");
1242 error (_("No symbol \"%s\" in current context."), exp
);
1246 printf_filtered ("Symbol \"");
1247 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1248 current_language
->la_language
, DMGL_ANSI
);
1249 printf_filtered ("\" is ");
1250 val
= SYMBOL_VALUE (sym
);
1251 section
= SYMBOL_OBJ_SECTION (sym
);
1252 gdbarch
= get_objfile_arch (SYMBOL_SYMTAB (sym
)->objfile
);
1254 switch (SYMBOL_CLASS (sym
))
1257 case LOC_CONST_BYTES
:
1258 printf_filtered ("constant");
1262 printf_filtered ("a label at address ");
1263 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1264 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1265 if (section_is_overlay (section
))
1267 load_addr
= overlay_unmapped_address (load_addr
, section
);
1268 printf_filtered (",\n -- loaded at ");
1269 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1270 printf_filtered (" in overlay section %s",
1271 section
->the_bfd_section
->name
);
1276 /* FIXME: cagney/2004-01-26: It should be possible to
1277 unconditionally call the SYMBOL_COMPUTED_OPS method when available.
1278 Unfortunately DWARF 2 stores the frame-base (instead of the
1279 function) location in a function's symbol. Oops! For the
1280 moment enable this when/where applicable. */
1281 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1286 /* GDBARCH is the architecture associated with the objfile the symbol
1287 is defined in; the target architecture may be different, and may
1288 provide additional registers. However, we do not know the target
1289 architecture at this point. We assume the objfile architecture
1290 will contain all the standard registers that occur in debug info
1292 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1294 if (SYMBOL_IS_ARGUMENT (sym
))
1295 printf_filtered (_("an argument in register %s"),
1296 gdbarch_register_name (gdbarch
, regno
));
1298 printf_filtered (_("a variable in register %s"),
1299 gdbarch_register_name (gdbarch
, regno
));
1303 printf_filtered (_("static storage at address "));
1304 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1305 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1306 if (section_is_overlay (section
))
1308 load_addr
= overlay_unmapped_address (load_addr
, section
);
1309 printf_filtered (_(",\n -- loaded at "));
1310 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1311 printf_filtered (_(" in overlay section %s"),
1312 section
->the_bfd_section
->name
);
1316 case LOC_REGPARM_ADDR
:
1317 /* Note comment at LOC_REGISTER. */
1318 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1319 printf_filtered (_("address of an argument in register %s"),
1320 gdbarch_register_name (gdbarch
, regno
));
1324 printf_filtered (_("an argument at offset %ld"), val
);
1328 printf_filtered (_("a local variable at frame offset %ld"), val
);
1332 printf_filtered (_("a reference argument at offset %ld"), val
);
1336 printf_filtered (_("a typedef"));
1340 printf_filtered (_("a function at address "));
1341 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1342 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1343 if (section_is_overlay (section
))
1345 load_addr
= overlay_unmapped_address (load_addr
, section
);
1346 printf_filtered (_(",\n -- loaded at "));
1347 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1348 printf_filtered (_(" in overlay section %s"),
1349 section
->the_bfd_section
->name
);
1353 case LOC_UNRESOLVED
:
1355 struct minimal_symbol
*msym
;
1357 msym
= lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (sym
), NULL
, NULL
);
1359 printf_filtered ("unresolved");
1362 section
= SYMBOL_OBJ_SECTION (msym
);
1363 load_addr
= SYMBOL_VALUE_ADDRESS (msym
);
1366 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1367 printf_filtered (_("a thread-local variable at offset %s "
1368 "in the thread-local storage for `%s'"),
1369 paddress (gdbarch
, load_addr
),
1370 section
->objfile
->name
);
1373 printf_filtered (_("static storage at address "));
1374 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1375 if (section_is_overlay (section
))
1377 load_addr
= overlay_unmapped_address (load_addr
, section
);
1378 printf_filtered (_(",\n -- loaded at "));
1379 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1380 printf_filtered (_(" in overlay section %s"),
1381 section
->the_bfd_section
->name
);
1388 case LOC_OPTIMIZED_OUT
:
1389 printf_filtered (_("optimized out"));
1393 printf_filtered (_("of unknown (botched) type"));
1396 printf_filtered (".\n");
1401 x_command (char *exp
, int from_tty
)
1403 struct expression
*expr
;
1404 struct format_data fmt
;
1405 struct cleanup
*old_chain
;
1408 fmt
.format
= last_format
? last_format
: 'x';
1409 fmt
.size
= last_size
;
1413 if (exp
&& *exp
== '/')
1415 const char *tmp
= exp
+ 1;
1417 fmt
= decode_format (&tmp
, last_format
, last_size
);
1421 /* If we have an expression, evaluate it and use it as the address. */
1423 if (exp
!= 0 && *exp
!= 0)
1425 expr
= parse_expression (exp
);
1426 /* Cause expression not to be there any more if this command is
1427 repeated with Newline. But don't clobber a user-defined
1428 command's definition. */
1431 old_chain
= make_cleanup (free_current_contents
, &expr
);
1432 val
= evaluate_expression (expr
);
1433 if (TYPE_CODE (value_type (val
)) == TYPE_CODE_REF
)
1434 val
= coerce_ref (val
);
1435 /* In rvalue contexts, such as this, functions are coerced into
1436 pointers to functions. This makes "x/i main" work. */
1437 if (/* last_format == 'i' && */
1438 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1439 && VALUE_LVAL (val
) == lval_memory
)
1440 next_address
= value_address (val
);
1442 next_address
= value_as_address (val
);
1444 next_gdbarch
= expr
->gdbarch
;
1445 do_cleanups (old_chain
);
1449 error_no_arg (_("starting display address"));
1451 do_examine (fmt
, next_gdbarch
, next_address
);
1453 /* If the examine succeeds, we remember its size and format for next
1454 time. Set last_size to 'b' for strings. */
1455 if (fmt
.format
== 's')
1458 last_size
= fmt
.size
;
1459 last_format
= fmt
.format
;
1461 /* Set a couple of internal variables if appropriate. */
1462 if (last_examine_value
)
1464 /* Make last address examined available to the user as $_. Use
1465 the correct pointer type. */
1466 struct type
*pointer_type
1467 = lookup_pointer_type (value_type (last_examine_value
));
1468 set_internalvar (lookup_internalvar ("_"),
1469 value_from_pointer (pointer_type
,
1470 last_examine_address
));
1472 /* Make contents of last address examined available to the user
1473 as $__. If the last value has not been fetched from memory
1474 then don't fetch it now; instead mark it by voiding the $__
1476 if (value_lazy (last_examine_value
))
1477 clear_internalvar (lookup_internalvar ("__"));
1479 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1484 /* Add an expression to the auto-display chain.
1485 Specify the expression. */
1488 display_command (char *arg
, int from_tty
)
1490 struct format_data fmt
;
1491 struct expression
*expr
;
1492 struct display
*new;
1494 const char *exp
= arg
;
1497 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1499 if (tui_active
&& exp
!= NULL
&& *exp
== '$')
1500 display_it
= (tui_set_layout_for_display_command (exp
) == TUI_FAILURE
);
1514 fmt
= decode_format (&exp
, 0, 0);
1515 if (fmt
.size
&& fmt
.format
== 0)
1517 if (fmt
.format
== 'i' || fmt
.format
== 's')
1528 innermost_block
= NULL
;
1529 expr
= parse_expression (exp
);
1531 new = (struct display
*) xmalloc (sizeof (struct display
));
1533 new->exp_string
= xstrdup (exp
);
1535 new->block
= innermost_block
;
1536 new->pspace
= current_program_space
;
1537 new->next
= display_chain
;
1538 new->number
= ++display_number
;
1541 display_chain
= new;
1543 if (from_tty
&& target_has_execution
)
1544 do_one_display (new);
1551 free_display (struct display
*d
)
1553 xfree (d
->exp_string
);
1558 /* Clear out the display_chain. Done when new symtabs are loaded,
1559 since this invalidates the types stored in many expressions. */
1562 clear_displays (void)
1566 while ((d
= display_chain
) != NULL
)
1568 display_chain
= d
->next
;
1573 /* Delete the auto-display DISPLAY. */
1576 delete_display (struct display
*display
)
1580 gdb_assert (display
!= NULL
);
1582 if (display_chain
== display
)
1583 display_chain
= display
->next
;
1586 if (d
->next
== display
)
1588 d
->next
= display
->next
;
1592 free_display (display
);
1595 /* Call FUNCTION on each of the displays whose numbers are given in
1596 ARGS. DATA is passed unmodified to FUNCTION. */
1599 map_display_numbers (char *args
,
1600 void (*function
) (struct display
*,
1604 struct get_number_or_range_state state
;
1608 error_no_arg (_("one or more display numbers"));
1610 init_number_or_range (&state
, args
);
1612 while (!state
.finished
)
1614 char *p
= state
.string
;
1616 num
= get_number_or_range (&state
);
1618 warning (_("bad display number at or near '%s'"), p
);
1621 struct display
*d
, *tmp
;
1623 ALL_DISPLAYS_SAFE (d
, tmp
)
1624 if (d
->number
== num
)
1627 printf_unfiltered (_("No display number %d.\n"), num
);
1634 /* Callback for map_display_numbers, that deletes a display. */
1637 do_delete_display (struct display
*d
, void *data
)
1642 /* "undisplay" command. */
1645 undisplay_command (char *args
, int from_tty
)
1649 if (query (_("Delete all auto-display expressions? ")))
1655 map_display_numbers (args
, do_delete_display
, NULL
);
1659 /* Display a single auto-display.
1660 Do nothing if the display cannot be printed in the current context,
1661 or if the display is disabled. */
1664 do_one_display (struct display
*d
)
1666 struct cleanup
*old_chain
;
1667 int within_current_scope
;
1669 if (d
->enabled_p
== 0)
1672 /* The expression carries the architecture that was used at parse time.
1673 This is a problem if the expression depends on architecture features
1674 (e.g. register numbers), and the current architecture is now different.
1675 For example, a display statement like "display/i $pc" is expected to
1676 display the PC register of the current architecture, not the arch at
1677 the time the display command was given. Therefore, we re-parse the
1678 expression if the current architecture has changed. */
1679 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1688 volatile struct gdb_exception ex
;
1690 TRY_CATCH (ex
, RETURN_MASK_ALL
)
1692 innermost_block
= NULL
;
1693 d
->exp
= parse_expression (d
->exp_string
);
1694 d
->block
= innermost_block
;
1698 /* Can't re-parse the expression. Disable this display item. */
1700 warning (_("Unable to display \"%s\": %s"),
1701 d
->exp_string
, ex
.message
);
1708 if (d
->pspace
== current_program_space
)
1709 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1711 within_current_scope
= 0;
1714 within_current_scope
= 1;
1715 if (!within_current_scope
)
1718 old_chain
= make_cleanup_restore_integer (¤t_display_number
);
1719 current_display_number
= d
->number
;
1721 annotate_display_begin ();
1722 printf_filtered ("%d", d
->number
);
1723 annotate_display_number_end ();
1724 printf_filtered (": ");
1727 volatile struct gdb_exception ex
;
1729 annotate_display_format ();
1731 printf_filtered ("x/");
1732 if (d
->format
.count
!= 1)
1733 printf_filtered ("%d", d
->format
.count
);
1734 printf_filtered ("%c", d
->format
.format
);
1735 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1736 printf_filtered ("%c", d
->format
.size
);
1737 printf_filtered (" ");
1739 annotate_display_expression ();
1741 puts_filtered (d
->exp_string
);
1742 annotate_display_expression_end ();
1744 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1745 printf_filtered ("\n");
1747 printf_filtered (" ");
1749 annotate_display_value ();
1751 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1756 val
= evaluate_expression (d
->exp
);
1757 addr
= value_as_address (val
);
1758 if (d
->format
.format
== 'i')
1759 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1760 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1763 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1767 struct value_print_options opts
;
1768 volatile struct gdb_exception ex
;
1770 annotate_display_format ();
1772 if (d
->format
.format
)
1773 printf_filtered ("/%c ", d
->format
.format
);
1775 annotate_display_expression ();
1777 puts_filtered (d
->exp_string
);
1778 annotate_display_expression_end ();
1780 printf_filtered (" = ");
1782 annotate_display_expression ();
1784 get_formatted_print_options (&opts
, d
->format
.format
);
1785 opts
.raw
= d
->format
.raw
;
1787 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1791 val
= evaluate_expression (d
->exp
);
1792 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1795 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1796 printf_filtered ("\n");
1799 annotate_display_end ();
1801 gdb_flush (gdb_stdout
);
1802 do_cleanups (old_chain
);
1805 /* Display all of the values on the auto-display chain which can be
1806 evaluated in the current scope. */
1813 for (d
= display_chain
; d
; d
= d
->next
)
1817 /* Delete the auto-display which we were in the process of displaying.
1818 This is done when there is an error or a signal. */
1821 disable_display (int num
)
1825 for (d
= display_chain
; d
; d
= d
->next
)
1826 if (d
->number
== num
)
1831 printf_unfiltered (_("No display number %d.\n"), num
);
1835 disable_current_display (void)
1837 if (current_display_number
>= 0)
1839 disable_display (current_display_number
);
1840 fprintf_unfiltered (gdb_stderr
,
1841 _("Disabling display %d to "
1842 "avoid infinite recursion.\n"),
1843 current_display_number
);
1845 current_display_number
= -1;
1849 display_info (char *ignore
, int from_tty
)
1854 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1856 printf_filtered (_("Auto-display expressions now in effect:\n\
1857 Num Enb Expression\n"));
1859 for (d
= display_chain
; d
; d
= d
->next
)
1861 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
1863 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
1865 else if (d
->format
.format
)
1866 printf_filtered ("/%c ", d
->format
.format
);
1867 puts_filtered (d
->exp_string
);
1868 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
1869 printf_filtered (_(" (cannot be evaluated in the current context)"));
1870 printf_filtered ("\n");
1871 gdb_flush (gdb_stdout
);
1875 /* Callback fo map_display_numbers, that enables or disables the
1876 passed in display D. */
1879 do_enable_disable_display (struct display
*d
, void *data
)
1881 d
->enabled_p
= *(int *) data
;
1884 /* Implamentation of both the "disable display" and "enable display"
1885 commands. ENABLE decides what to do. */
1888 enable_disable_display_command (char *args
, int from_tty
, int enable
)
1895 d
->enabled_p
= enable
;
1899 map_display_numbers (args
, do_enable_disable_display
, &enable
);
1902 /* The "enable display" command. */
1905 enable_display_command (char *args
, int from_tty
)
1907 enable_disable_display_command (args
, from_tty
, 1);
1910 /* The "disable display" command. */
1913 disable_display_command (char *args
, int from_tty
)
1915 enable_disable_display_command (args
, from_tty
, 0);
1918 /* display_chain items point to blocks and expressions. Some expressions in
1919 turn may point to symbols.
1920 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1921 obstack_free'd when a shared library is unloaded.
1922 Clear pointers that are about to become dangling.
1923 Both .exp and .block fields will be restored next time we need to display
1924 an item by re-parsing .exp_string field in the new execution context. */
1927 clear_dangling_display_expressions (struct so_list
*solib
)
1929 struct objfile
*objfile
= solib
->objfile
;
1932 /* With no symbol file we cannot have a block or expression from it. */
1933 if (objfile
== NULL
)
1935 if (objfile
->separate_debug_objfile_backlink
)
1936 objfile
= objfile
->separate_debug_objfile_backlink
;
1937 gdb_assert (objfile
->pspace
== solib
->pspace
);
1939 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
1941 if (d
->pspace
!= solib
->pspace
)
1944 if (lookup_objfile_from_block (d
->block
) == objfile
1945 || (d
->exp
&& exp_uses_objfile (d
->exp
, objfile
)))
1955 /* Print the value in stack frame FRAME of a variable specified by a
1956 struct symbol. NAME is the name to print; if NULL then VAR's print
1957 name will be used. STREAM is the ui_file on which to print the
1958 value. INDENT specifies the number of indent levels to print
1959 before printing the variable name.
1961 This function invalidates FRAME. */
1964 print_variable_and_value (const char *name
, struct symbol
*var
,
1965 struct frame_info
*frame
,
1966 struct ui_file
*stream
, int indent
)
1968 volatile struct gdb_exception except
;
1971 name
= SYMBOL_PRINT_NAME (var
);
1973 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
1974 TRY_CATCH (except
, RETURN_MASK_ERROR
)
1977 struct value_print_options opts
;
1979 val
= read_var_value (var
, frame
);
1980 get_user_print_options (&opts
);
1982 common_val_print (val
, stream
, indent
, &opts
, current_language
);
1984 /* common_val_print invalidates FRAME when a pretty printer calls inferior
1988 if (except
.reason
< 0)
1989 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
1991 fprintf_filtered (stream
, "\n");
1994 /* Subroutine of ui_printf to simplify it.
1995 Print VALUE to STREAM using FORMAT.
1996 VALUE is a C-style string on the target. */
1999 printf_c_string (struct ui_file
*stream
, const char *format
,
2000 struct value
*value
)
2006 tem
= value_as_address (value
);
2008 /* This is a %s argument. Find the length of the string. */
2014 read_memory (tem
+ j
, &c
, 1);
2019 /* Copy the string contents into a string inside GDB. */
2020 str
= (gdb_byte
*) alloca (j
+ 1);
2022 read_memory (tem
, str
, j
);
2025 fprintf_filtered (stream
, format
, (char *) str
);
2028 /* Subroutine of ui_printf to simplify it.
2029 Print VALUE to STREAM using FORMAT.
2030 VALUE is a wide C-style string on the target. */
2033 printf_wide_c_string (struct ui_file
*stream
, const char *format
,
2034 struct value
*value
)
2039 struct gdbarch
*gdbarch
= get_type_arch (value_type (value
));
2040 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2041 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2042 "wchar_t", NULL
, 0);
2043 int wcwidth
= TYPE_LENGTH (wctype
);
2044 gdb_byte
*buf
= alloca (wcwidth
);
2045 struct obstack output
;
2046 struct cleanup
*inner_cleanup
;
2048 tem
= value_as_address (value
);
2050 /* This is a %s argument. Find the length of the string. */
2051 for (j
= 0;; j
+= wcwidth
)
2054 read_memory (tem
+ j
, buf
, wcwidth
);
2055 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2059 /* Copy the string contents into a string inside GDB. */
2060 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2062 read_memory (tem
, str
, j
);
2063 memset (&str
[j
], 0, wcwidth
);
2065 obstack_init (&output
);
2066 inner_cleanup
= make_cleanup_obstack_free (&output
);
2068 convert_between_encodings (target_wide_charset (gdbarch
),
2071 &output
, translit_char
);
2072 obstack_grow_str0 (&output
, "");
2074 fprintf_filtered (stream
, format
, obstack_base (&output
));
2075 do_cleanups (inner_cleanup
);
2078 /* Subroutine of ui_printf to simplify it.
2079 Print VALUE, a decimal floating point value, to STREAM using FORMAT. */
2082 printf_decfloat (struct ui_file
*stream
, const char *format
,
2083 struct value
*value
)
2085 const gdb_byte
*param_ptr
= value_contents (value
);
2087 #if defined (PRINTF_HAS_DECFLOAT)
2088 /* If we have native support for Decimal floating
2089 printing, handle it here. */
2090 fprintf_filtered (stream
, format
, param_ptr
);
2092 /* As a workaround until vasprintf has native support for DFP
2093 we convert the DFP values to string and print them using
2094 the %s format specifier. */
2097 /* Parameter data. */
2098 struct type
*param_type
= value_type (value
);
2099 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2100 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2102 /* DFP output data. */
2103 struct value
*dfp_value
= NULL
;
2107 struct type
*dfp_type
= NULL
;
2108 char decstr
[MAX_DECIMAL_STRING
];
2110 /* Points to the end of the string so that we can go back
2111 and check for DFP length modifiers. */
2112 p
= format
+ strlen (format
);
2114 /* Look for the float/double format specifier. */
2115 while (*p
!= 'f' && *p
!= 'e' && *p
!= 'E'
2116 && *p
!= 'g' && *p
!= 'G')
2119 /* Search for the '%' char and extract the size and type of
2120 the output decimal value based on its modifiers
2121 (%Hf, %Df, %DDf). */
2127 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2129 else if (*p
== 'D' && *(p
- 1) == 'D')
2132 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2138 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2142 /* Conversion between different DFP types. */
2143 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2144 decimal_convert (param_ptr
, TYPE_LENGTH (param_type
),
2145 byte_order
, dec
, dfp_len
, byte_order
);
2147 /* If this is a non-trivial conversion, just output 0.
2148 A correct converted value can be displayed by explicitly
2149 casting to a DFP type. */
2150 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2152 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2154 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2156 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2158 /* Print the DFP value. */
2159 fprintf_filtered (stream
, "%s", decstr
);
2163 /* Subroutine of ui_printf to simplify it.
2164 Print VALUE, a target pointer, to STREAM using FORMAT. */
2167 printf_pointer (struct ui_file
*stream
, const char *format
,
2168 struct value
*value
)
2170 /* We avoid the host's %p because pointers are too
2171 likely to be the wrong size. The only interesting
2172 modifier for %p is a width; extract that, and then
2173 handle %p as glibc would: %#x or a literal "(nil)". */
2177 #ifdef PRINTF_HAS_LONG_LONG
2178 long long val
= value_as_long (value
);
2180 long val
= value_as_long (value
);
2183 fmt
= alloca (strlen (format
) + 5);
2185 /* Copy up to the leading %. */
2190 int is_percent
= (*p
== '%');
2205 /* Copy any width. */
2206 while (*p
>= '0' && *p
< '9')
2209 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2212 #ifdef PRINTF_HAS_LONG_LONG
2218 fprintf_filtered (stream
, fmt
, val
);
2224 fprintf_filtered (stream
, fmt
, "(nil)");
2228 /* printf "printf format string" ARG to STREAM. */
2231 ui_printf (const char *arg
, struct ui_file
*stream
)
2233 struct format_piece
*fpieces
;
2234 const char *s
= arg
;
2235 struct value
**val_args
;
2236 int allocated_args
= 20;
2237 struct cleanup
*old_cleanups
;
2239 val_args
= xmalloc (allocated_args
* sizeof (struct value
*));
2240 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2243 error_no_arg (_("format-control string and values to print"));
2245 s
= skip_spaces_const (s
);
2247 /* A format string should follow, enveloped in double quotes. */
2249 error (_("Bad format string, missing '\"'."));
2251 fpieces
= parse_format_string (&s
);
2253 make_cleanup (free_format_pieces_cleanup
, &fpieces
);
2256 error (_("Bad format string, non-terminated '\"'."));
2258 s
= skip_spaces_const (s
);
2260 if (*s
!= ',' && *s
!= 0)
2261 error (_("Invalid argument syntax"));
2265 s
= skip_spaces_const (s
);
2271 char *current_substring
;
2274 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2275 if (fpieces
[fr
].argclass
!= literal_piece
)
2278 /* Now, parse all arguments and evaluate them.
2279 Store the VALUEs in VAL_ARGS. */
2285 if (nargs
== allocated_args
)
2286 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2287 (allocated_args
*= 2)
2288 * sizeof (struct value
*));
2290 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2298 if (nargs
!= nargs_wanted
)
2299 error (_("Wrong number of arguments for specified format-string"));
2301 /* Now actually print them. */
2303 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2305 current_substring
= fpieces
[fr
].string
;
2306 switch (fpieces
[fr
].argclass
)
2309 printf_c_string (stream
, current_substring
, val_args
[i
]);
2311 case wide_string_arg
:
2312 printf_wide_c_string (stream
, current_substring
, val_args
[i
]);
2316 struct gdbarch
*gdbarch
2317 = get_type_arch (value_type (val_args
[i
]));
2318 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2319 "wchar_t", NULL
, 0);
2320 struct type
*valtype
;
2321 struct obstack output
;
2322 struct cleanup
*inner_cleanup
;
2323 const gdb_byte
*bytes
;
2325 valtype
= value_type (val_args
[i
]);
2326 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2327 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2328 error (_("expected wchar_t argument for %%lc"));
2330 bytes
= value_contents (val_args
[i
]);
2332 obstack_init (&output
);
2333 inner_cleanup
= make_cleanup_obstack_free (&output
);
2335 convert_between_encodings (target_wide_charset (gdbarch
),
2337 bytes
, TYPE_LENGTH (valtype
),
2338 TYPE_LENGTH (valtype
),
2339 &output
, translit_char
);
2340 obstack_grow_str0 (&output
, "");
2342 fprintf_filtered (stream
, current_substring
,
2343 obstack_base (&output
));
2344 do_cleanups (inner_cleanup
);
2349 struct type
*type
= value_type (val_args
[i
]);
2353 /* If format string wants a float, unchecked-convert the value
2354 to floating point of the same size. */
2355 type
= float_type_from_length (type
);
2356 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2358 error (_("Invalid floating value found in program."));
2360 fprintf_filtered (stream
, current_substring
, (double) val
);
2363 case long_double_arg
:
2364 #ifdef HAVE_LONG_DOUBLE
2366 struct type
*type
= value_type (val_args
[i
]);
2370 /* If format string wants a float, unchecked-convert the value
2371 to floating point of the same size. */
2372 type
= float_type_from_length (type
);
2373 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2375 error (_("Invalid floating value found in program."));
2377 fprintf_filtered (stream
, current_substring
,
2382 error (_("long double not supported in printf"));
2385 #ifdef PRINTF_HAS_LONG_LONG
2387 long long val
= value_as_long (val_args
[i
]);
2389 fprintf_filtered (stream
, current_substring
, val
);
2393 error (_("long long not supported in printf"));
2397 int val
= value_as_long (val_args
[i
]);
2399 fprintf_filtered (stream
, current_substring
, val
);
2404 long val
= value_as_long (val_args
[i
]);
2406 fprintf_filtered (stream
, current_substring
, val
);
2409 /* Handles decimal floating values. */
2411 printf_decfloat (stream
, current_substring
, val_args
[i
]);
2414 printf_pointer (stream
, current_substring
, val_args
[i
]);
2417 /* Print a portion of the format string that has no
2418 directives. Note that this will not include any
2419 ordinary %-specs, but it might include "%%". That is
2420 why we use printf_filtered and not puts_filtered here.
2421 Also, we pass a dummy argument because some platforms
2422 have modified GCC to include -Wformat-security by
2423 default, which will warn here if there is no
2425 fprintf_filtered (stream
, current_substring
, 0);
2428 internal_error (__FILE__
, __LINE__
,
2429 _("failed internal consistency check"));
2431 /* Maybe advance to the next argument. */
2432 if (fpieces
[fr
].argclass
!= literal_piece
)
2436 do_cleanups (old_cleanups
);
2439 /* Implement the "printf" command. */
2442 printf_command (char *arg
, int from_tty
)
2444 ui_printf (arg
, gdb_stdout
);
2447 /* Implement the "eval" command. */
2450 eval_command (char *arg
, int from_tty
)
2452 struct ui_file
*ui_out
= mem_fileopen ();
2453 struct cleanup
*cleanups
= make_cleanup_ui_file_delete (ui_out
);
2456 ui_printf (arg
, ui_out
);
2458 expanded
= ui_file_xstrdup (ui_out
, NULL
);
2459 make_cleanup (xfree
, expanded
);
2461 execute_command (expanded
, from_tty
);
2463 do_cleanups (cleanups
);
2467 _initialize_printcmd (void)
2469 struct cmd_list_element
*c
;
2471 current_display_number
= -1;
2473 observer_attach_solib_unloaded (clear_dangling_display_expressions
);
2475 add_info ("address", address_info
,
2476 _("Describe where symbol SYM is stored."));
2478 add_info ("symbol", sym_info
, _("\
2479 Describe what symbol is at location ADDR.\n\
2480 Only for symbols with fixed locations (global or static scope)."));
2482 add_com ("x", class_vars
, x_command
, _("\
2483 Examine memory: x/FMT ADDRESS.\n\
2484 ADDRESS is an expression for the memory address to examine.\n\
2485 FMT is a repeat count followed by a format letter and a size letter.\n\
2486 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2487 t(binary), f(float), a(address), i(instruction), c(char) and s(string).\n\
2488 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2489 The specified number of objects of the specified size are printed\n\
2490 according to the format.\n\n\
2491 Defaults for format and size letters are those previously used.\n\
2492 Default count is 1. Default address is following last thing printed\n\
2493 with this command or \"print\"."));
2496 add_com ("whereis", class_vars
, whereis_command
,
2497 _("Print line number and file of definition of variable."));
2500 add_info ("display", display_info
, _("\
2501 Expressions to display when program stops, with code numbers."));
2503 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2504 Cancel some expressions to be displayed when program stops.\n\
2505 Arguments are the code numbers of the expressions to stop displaying.\n\
2506 No argument means cancel all automatic-display expressions.\n\
2507 \"delete display\" has the same effect as this command.\n\
2508 Do \"info display\" to see current list of code numbers."),
2511 add_com ("display", class_vars
, display_command
, _("\
2512 Print value of expression EXP each time the program stops.\n\
2513 /FMT may be used before EXP as in the \"print\" command.\n\
2514 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2515 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2516 and examining is done as in the \"x\" command.\n\n\
2517 With no argument, display all currently requested auto-display expressions.\n\
2518 Use \"undisplay\" to cancel display requests previously made."));
2520 add_cmd ("display", class_vars
, enable_display_command
, _("\
2521 Enable some expressions to be displayed when program stops.\n\
2522 Arguments are the code numbers of the expressions to resume displaying.\n\
2523 No argument means enable all automatic-display expressions.\n\
2524 Do \"info display\" to see current list of code numbers."), &enablelist
);
2526 add_cmd ("display", class_vars
, disable_display_command
, _("\
2527 Disable some expressions to be displayed when program stops.\n\
2528 Arguments are the code numbers of the expressions to stop displaying.\n\
2529 No argument means disable all automatic-display expressions.\n\
2530 Do \"info display\" to see current list of code numbers."), &disablelist
);
2532 add_cmd ("display", class_vars
, undisplay_command
, _("\
2533 Cancel some expressions to be displayed when program stops.\n\
2534 Arguments are the code numbers of the expressions to stop displaying.\n\
2535 No argument means cancel all automatic-display expressions.\n\
2536 Do \"info display\" to see current list of code numbers."), &deletelist
);
2538 add_com ("printf", class_vars
, printf_command
, _("\
2539 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2540 This is useful for formatted output in user-defined commands."));
2542 add_com ("output", class_vars
, output_command
, _("\
2543 Like \"print\" but don't put in value history and don't print newline.\n\
2544 This is useful in user-defined commands."));
2546 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2547 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2548 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2549 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2550 with $), a register (a few standard names starting with $), or an actual\n\
2551 variable in the program being debugged. EXP is any valid expression.\n\
2552 Use \"set variable\" for variables with names identical to set subcommands.\n\
2554 With a subcommand, this command modifies parts of the gdb environment.\n\
2555 You can see these environment settings with the \"show\" command."),
2556 &setlist
, "set ", 1, &cmdlist
);
2558 add_com ("assign", class_vars
, set_command
, _("\
2559 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2560 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2561 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2562 with $), a register (a few standard names starting with $), or an actual\n\
2563 variable in the program being debugged. EXP is any valid expression.\n\
2564 Use \"set variable\" for variables with names identical to set subcommands.\n\
2565 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2566 You can see these environment settings with the \"show\" command."));
2568 /* "call" is the same as "set", but handy for dbx users to call fns. */
2569 c
= add_com ("call", class_vars
, call_command
, _("\
2570 Call a function in the program.\n\
2571 The argument is the function name and arguments, in the notation of the\n\
2572 current working language. The result is printed and saved in the value\n\
2573 history, if it is not void."));
2574 set_cmd_completer (c
, expression_completer
);
2576 add_cmd ("variable", class_vars
, set_command
, _("\
2577 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2578 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2579 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2580 with $), a register (a few standard names starting with $), or an actual\n\
2581 variable in the program being debugged. EXP is any valid expression.\n\
2582 This may usually be abbreviated to simply \"set\"."),
2585 c
= add_com ("print", class_vars
, print_command
, _("\
2586 Print value of expression EXP.\n\
2587 Variables accessible are those of the lexical environment of the selected\n\
2588 stack frame, plus all those whose scope is global or an entire file.\n\
2590 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2591 $$NUM refers to NUM'th value back from the last one.\n\
2592 Names starting with $ refer to registers (with the values they would have\n\
2593 if the program were to return to the stack frame now selected, restoring\n\
2594 all registers saved by frames farther in) or else to debugger\n\
2595 \"convenience\" variables (any such name not a known register).\n\
2596 Use assignment expressions to give values to convenience variables.\n\
2598 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2599 @ is a binary operator for treating consecutive data objects\n\
2600 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2601 element is FOO, whose second element is stored in the space following\n\
2602 where FOO is stored, etc. FOO must be an expression whose value\n\
2603 resides in memory.\n\
2605 EXP may be preceded with /FMT, where FMT is a format letter\n\
2606 but no count or size letter (see \"x\" command)."));
2607 set_cmd_completer (c
, expression_completer
);
2608 add_com_alias ("p", "print", class_vars
, 1);
2609 add_com_alias ("inspect", "print", class_vars
, 1);
2611 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2612 &max_symbolic_offset
, _("\
2613 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2614 Show the largest offset that will be printed in <symbol+1234> form."), NULL
,
2616 show_max_symbolic_offset
,
2617 &setprintlist
, &showprintlist
);
2618 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2619 &print_symbol_filename
, _("\
2620 Set printing of source filename and line number with <symbol>."), _("\
2621 Show printing of source filename and line number with <symbol>."), NULL
,
2623 show_print_symbol_filename
,
2624 &setprintlist
, &showprintlist
);
2626 add_com ("eval", no_class
, eval_command
, _("\
2627 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2628 a command line, and call it."));