1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2017 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"
48 #include "cli/cli-script.h"
51 #include "common/byte-vector.h"
54 #include "tui/tui.h" /* For tui_active et al. */
57 /* Last specified output format. */
59 static char last_format
= 0;
61 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
63 static char last_size
= 'w';
65 /* Default address to examine next, and associated architecture. */
67 static struct gdbarch
*next_gdbarch
;
68 static CORE_ADDR next_address
;
70 /* Number of delay instructions following current disassembled insn. */
72 static int branch_delay_insns
;
74 /* Last address examined. */
76 static CORE_ADDR last_examine_address
;
78 /* Contents of last address examined.
79 This is not valid past the end of the `x' command! */
81 static struct value
*last_examine_value
;
83 /* Largest offset between a symbolic value and an address, that will be
84 printed as `0x1234 <symbol+offset>'. */
86 static unsigned int max_symbolic_offset
= UINT_MAX
;
88 show_max_symbolic_offset (struct ui_file
*file
, int from_tty
,
89 struct cmd_list_element
*c
, const char *value
)
91 fprintf_filtered (file
,
92 _("The largest offset that will be "
93 "printed in <symbol+1234> form is %s.\n"),
97 /* Append the source filename and linenumber of the symbol when
98 printing a symbolic value as `<symbol at filename:linenum>' if set. */
99 static int print_symbol_filename
= 0;
101 show_print_symbol_filename (struct ui_file
*file
, int from_tty
,
102 struct cmd_list_element
*c
, const char *value
)
104 fprintf_filtered (file
, _("Printing of source filename and "
105 "line number with <symbol> is %s.\n"),
109 /* Number of auto-display expression currently being displayed.
110 So that we can disable it if we get a signal within it.
111 -1 when not doing one. */
113 static int current_display_number
;
117 /* Chain link to next auto-display item. */
118 struct display
*next
;
120 /* The expression as the user typed it. */
123 /* Expression to be evaluated and displayed. */
126 /* Item number of this auto-display item. */
129 /* Display format specified. */
130 struct format_data format
;
132 /* Program space associated with `block'. */
133 struct program_space
*pspace
;
135 /* Innermost block required by this expression when evaluated. */
136 const struct block
*block
;
138 /* Status of this display (enabled or disabled). */
142 /* Chain of expressions whose values should be displayed
143 automatically each time the program stops. */
145 static struct display
*display_chain
;
147 static int display_number
;
149 /* Walk the following statement or block through all displays.
150 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
153 #define ALL_DISPLAYS(B) \
154 for (B = display_chain; B; B = B->next)
156 #define ALL_DISPLAYS_SAFE(B,TMP) \
157 for (B = display_chain; \
158 B ? (TMP = B->next, 1): 0; \
161 /* Prototypes for exported functions. */
163 void _initialize_printcmd (void);
165 /* Prototypes for local functions. */
167 static void do_one_display (struct display
*);
170 /* Decode a format specification. *STRING_PTR should point to it.
171 OFORMAT and OSIZE are used as defaults for the format and size
172 if none are given in the format specification.
173 If OSIZE is zero, then the size field of the returned value
174 should be set only if a size is explicitly specified by the
176 The structure returned describes all the data
177 found in the specification. In addition, *STRING_PTR is advanced
178 past the specification and past all whitespace following it. */
180 static struct format_data
181 decode_format (const char **string_ptr
, int oformat
, int osize
)
183 struct format_data val
;
184 const char *p
= *string_ptr
;
196 if (*p
>= '0' && *p
<= '9')
197 val
.count
*= atoi (p
);
198 while (*p
>= '0' && *p
<= '9')
201 /* Now process size or format letters that follow. */
205 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
212 else if (*p
>= 'a' && *p
<= 'z')
218 while (*p
== ' ' || *p
== '\t')
222 /* Set defaults for format and size if not specified. */
223 if (val
.format
== '?')
227 /* Neither has been specified. */
228 val
.format
= oformat
;
232 /* If a size is specified, any format makes a reasonable
233 default except 'i'. */
234 val
.format
= oformat
== 'i' ? 'x' : oformat
;
236 else if (val
.size
== '?')
240 /* Pick the appropriate size for an address. This is deferred
241 until do_examine when we know the actual architecture to use.
242 A special size value of 'a' is used to indicate this case. */
243 val
.size
= osize
? 'a' : osize
;
246 /* Floating point has to be word or giantword. */
247 if (osize
== 'w' || osize
== 'g')
250 /* Default it to giantword if the last used size is not
252 val
.size
= osize
? 'g' : osize
;
255 /* Characters default to one byte. */
256 val
.size
= osize
? 'b' : osize
;
259 /* Display strings with byte size chars unless explicitly
265 /* The default is the size most recently specified. */
272 /* Print value VAL on stream according to OPTIONS.
273 Do not end with a newline.
274 SIZE is the letter for the size of datum being printed.
275 This is used to pad hex numbers so they line up. SIZE is 0
276 for print / output and set for examine. */
279 print_formatted (struct value
*val
, int size
,
280 const struct value_print_options
*options
,
281 struct ui_file
*stream
)
283 struct type
*type
= check_typedef (value_type (val
));
284 int len
= TYPE_LENGTH (type
);
286 if (VALUE_LVAL (val
) == lval_memory
)
287 next_address
= value_address (val
) + len
;
291 switch (options
->format
)
295 struct type
*elttype
= value_type (val
);
297 next_address
= (value_address (val
)
298 + val_print_string (elttype
, NULL
,
299 value_address (val
), -1,
300 stream
, options
) * len
);
305 /* We often wrap here if there are long symbolic names. */
307 next_address
= (value_address (val
)
308 + gdb_print_insn (get_type_arch (type
),
309 value_address (val
), stream
,
310 &branch_delay_insns
));
315 if (options
->format
== 0 || options
->format
== 's'
316 || TYPE_CODE (type
) == TYPE_CODE_REF
317 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
318 || TYPE_CODE (type
) == TYPE_CODE_STRING
319 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
320 || TYPE_CODE (type
) == TYPE_CODE_UNION
321 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
322 value_print (val
, stream
, options
);
324 /* User specified format, so don't look to the type to tell us
326 val_print_scalar_formatted (type
,
327 value_embedded_offset (val
),
329 options
, size
, stream
);
332 /* Return builtin floating point type of same length as TYPE.
333 If no such type is found, return TYPE itself. */
335 float_type_from_length (struct type
*type
)
337 struct gdbarch
*gdbarch
= get_type_arch (type
);
338 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
340 if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_float
))
341 type
= builtin
->builtin_float
;
342 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_double
))
343 type
= builtin
->builtin_double
;
344 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_long_double
))
345 type
= builtin
->builtin_long_double
;
350 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
351 according to OPTIONS and SIZE on STREAM. Formats s and i are not
352 supported at this level. */
355 print_scalar_formatted (const gdb_byte
*valaddr
, struct type
*type
,
356 const struct value_print_options
*options
,
357 int size
, struct ui_file
*stream
)
359 struct gdbarch
*gdbarch
= get_type_arch (type
);
360 unsigned int len
= TYPE_LENGTH (type
);
361 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
363 /* String printing should go through val_print_scalar_formatted. */
364 gdb_assert (options
->format
!= 's');
366 /* If the value is a pointer, and pointers and addresses are not the
367 same, then at this point, the value's length (in target bytes) is
368 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
369 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
370 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
372 /* If we are printing it as unsigned, truncate it in case it is actually
373 a negative signed value (e.g. "print/u (short)-1" should print 65535
374 (if shorts are 16 bits) instead of 4294967295). */
375 if (options
->format
!= 'c'
376 && (options
->format
!= 'd' || TYPE_UNSIGNED (type
)))
378 if (len
< TYPE_LENGTH (type
) && byte_order
== BFD_ENDIAN_BIG
)
379 valaddr
+= TYPE_LENGTH (type
) - len
;
382 if (size
!= 0 && (options
->format
== 'x' || options
->format
== 't'))
384 /* Truncate to fit. */
401 error (_("Undefined output size \"%c\"."), size
);
403 if (newlen
< len
&& byte_order
== BFD_ENDIAN_BIG
)
404 valaddr
+= len
- newlen
;
408 /* Historically gdb has printed floats by first casting them to a
409 long, and then printing the long. PR cli/16242 suggests changing
410 this to using C-style hex float format. */
411 gdb::byte_vector converted_float_bytes
;
412 if (TYPE_CODE (type
) == TYPE_CODE_FLT
413 && (options
->format
== 'o'
414 || options
->format
== 'x'
415 || options
->format
== 't'
416 || options
->format
== 'z'))
418 LONGEST val_long
= unpack_long (type
, valaddr
);
419 converted_float_bytes
.resize (TYPE_LENGTH (type
));
420 store_signed_integer (converted_float_bytes
.data (), TYPE_LENGTH (type
),
421 byte_order
, val_long
);
422 valaddr
= converted_float_bytes
.data ();
425 switch (options
->format
)
428 print_octal_chars (stream
, valaddr
, len
, byte_order
);
431 print_decimal_chars (stream
, valaddr
, len
, false, byte_order
);
435 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
437 print_decimal_chars (stream
, valaddr
, len
, !TYPE_UNSIGNED (type
),
443 type
= float_type_from_length (type
);
444 print_floating (valaddr
, type
, stream
);
448 print_binary_chars (stream
, valaddr
, len
, byte_order
, size
> 0);
451 print_hex_chars (stream
, valaddr
, len
, byte_order
, size
> 0);
454 print_hex_chars (stream
, valaddr
, len
, byte_order
, true);
458 struct value_print_options opts
= *options
;
460 LONGEST val_long
= unpack_long (type
, valaddr
);
463 if (TYPE_UNSIGNED (type
))
464 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
466 type
= builtin_type (gdbarch
)->builtin_true_char
;
468 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
474 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
476 print_address (gdbarch
, addr
, stream
);
481 error (_("Undefined output format \"%c\"."), options
->format
);
485 /* Specify default address for `x' command.
486 The `info lines' command uses this. */
489 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
491 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
493 next_gdbarch
= gdbarch
;
496 /* Make address available to the user as $_. */
497 set_internalvar (lookup_internalvar ("_"),
498 value_from_pointer (ptr_type
, addr
));
501 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
502 after LEADIN. Print nothing if no symbolic name is found nearby.
503 Optionally also print source file and line number, if available.
504 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
505 or to interpret it as a possible C++ name and convert it back to source
506 form. However note that DO_DEMANGLE can be overridden by the specific
507 settings of the demangle and asm_demangle variables. Returns
508 non-zero if anything was printed; zero otherwise. */
511 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
512 struct ui_file
*stream
,
513 int do_demangle
, const char *leadin
)
516 char *filename
= NULL
;
521 /* Throw away both name and filename. */
522 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
523 make_cleanup (free_current_contents
, &filename
);
525 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
526 &filename
, &line
, &unmapped
))
528 do_cleanups (cleanup_chain
);
532 fputs_filtered (leadin
, stream
);
534 fputs_filtered ("<*", stream
);
536 fputs_filtered ("<", stream
);
537 fputs_filtered (name
, stream
);
539 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
541 /* Append source filename and line number if desired. Give specific
542 line # of this addr, if we have it; else line # of the nearest symbol. */
543 if (print_symbol_filename
&& filename
!= NULL
)
546 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
548 fprintf_filtered (stream
, " in %s", filename
);
551 fputs_filtered ("*>", stream
);
553 fputs_filtered (">", stream
);
555 do_cleanups (cleanup_chain
);
559 /* Given an address ADDR return all the elements needed to print the
560 address in a symbolic form. NAME can be mangled or not depending
561 on DO_DEMANGLE (and also on the asm_demangle global variable,
562 manipulated via ''set print asm-demangle''). Return 0 in case of
563 success, when all the info in the OUT paramters is valid. Return 1
566 build_address_symbolic (struct gdbarch
*gdbarch
,
567 CORE_ADDR addr
, /* IN */
568 int do_demangle
, /* IN */
569 char **name
, /* OUT */
570 int *offset
, /* OUT */
571 char **filename
, /* OUT */
573 int *unmapped
) /* OUT */
575 struct bound_minimal_symbol msymbol
;
576 struct symbol
*symbol
;
577 CORE_ADDR name_location
= 0;
578 struct obj_section
*section
= NULL
;
579 const char *name_temp
= "";
581 /* Let's say it is mapped (not unmapped). */
584 /* Determine if the address is in an overlay, and whether it is
586 if (overlay_debugging
)
588 section
= find_pc_overlay (addr
);
589 if (pc_in_unmapped_range (addr
, section
))
592 addr
= overlay_mapped_address (addr
, section
);
596 /* First try to find the address in the symbol table, then
597 in the minsyms. Take the closest one. */
599 /* This is defective in the sense that it only finds text symbols. So
600 really this is kind of pointless--we should make sure that the
601 minimal symbols have everything we need (by changing that we could
602 save some memory, but for many debug format--ELF/DWARF or
603 anything/stabs--it would be inconvenient to eliminate those minimal
605 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
606 symbol
= find_pc_sect_function (addr
, section
);
610 /* If this is a function (i.e. a code address), strip out any
611 non-address bits. For instance, display a pointer to the
612 first instruction of a Thumb function as <function>; the
613 second instruction will be <function+2>, even though the
614 pointer is <function+3>. This matches the ISA behavior. */
615 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
617 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
618 if (do_demangle
|| asm_demangle
)
619 name_temp
= SYMBOL_PRINT_NAME (symbol
);
621 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
624 if (msymbol
.minsym
!= NULL
625 && MSYMBOL_HAS_SIZE (msymbol
.minsym
)
626 && MSYMBOL_SIZE (msymbol
.minsym
) == 0
627 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text
628 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text_gnu_ifunc
629 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_file_text
)
630 msymbol
.minsym
= NULL
;
632 if (msymbol
.minsym
!= NULL
)
634 if (BMSYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
636 /* If this is a function (i.e. a code address), strip out any
637 non-address bits. For instance, display a pointer to the
638 first instruction of a Thumb function as <function>; the
639 second instruction will be <function+2>, even though the
640 pointer is <function+3>. This matches the ISA behavior. */
641 if (MSYMBOL_TYPE (msymbol
.minsym
) == mst_text
642 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_text_gnu_ifunc
643 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_file_text
644 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_solib_trampoline
)
645 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
647 /* The msymbol is closer to the address than the symbol;
648 use the msymbol instead. */
650 name_location
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
651 if (do_demangle
|| asm_demangle
)
652 name_temp
= MSYMBOL_PRINT_NAME (msymbol
.minsym
);
654 name_temp
= MSYMBOL_LINKAGE_NAME (msymbol
.minsym
);
657 if (symbol
== NULL
&& msymbol
.minsym
== NULL
)
660 /* If the nearest symbol is too far away, don't print anything symbolic. */
662 /* For when CORE_ADDR is larger than unsigned int, we do math in
663 CORE_ADDR. But when we detect unsigned wraparound in the
664 CORE_ADDR math, we ignore this test and print the offset,
665 because addr+max_symbolic_offset has wrapped through the end
666 of the address space back to the beginning, giving bogus comparison. */
667 if (addr
> name_location
+ max_symbolic_offset
668 && name_location
+ max_symbolic_offset
> name_location
)
671 *offset
= addr
- name_location
;
673 *name
= xstrdup (name_temp
);
675 if (print_symbol_filename
)
677 struct symtab_and_line sal
;
679 sal
= find_pc_sect_line (addr
, section
, 0);
683 *filename
= xstrdup (symtab_to_filename_for_display (sal
.symtab
));
691 /* Print address ADDR symbolically on STREAM.
692 First print it as a number. Then perhaps print
693 <SYMBOL + OFFSET> after the number. */
696 print_address (struct gdbarch
*gdbarch
,
697 CORE_ADDR addr
, struct ui_file
*stream
)
699 fputs_filtered (paddress (gdbarch
, addr
), stream
);
700 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
703 /* Return a prefix for instruction address:
704 "=> " for current instruction, else " ". */
707 pc_prefix (CORE_ADDR addr
)
709 if (has_stack_frames ())
711 struct frame_info
*frame
;
714 frame
= get_selected_frame (NULL
);
715 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
721 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
722 controls whether to print the symbolic name "raw" or demangled.
723 Return non-zero if anything was printed; zero otherwise. */
726 print_address_demangle (const struct value_print_options
*opts
,
727 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
728 struct ui_file
*stream
, int do_demangle
)
730 if (opts
->addressprint
)
732 fputs_filtered (paddress (gdbarch
, addr
), stream
);
733 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
737 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
743 /* Find the address of the instruction that is INST_COUNT instructions before
744 the instruction at ADDR.
745 Since some architectures have variable-length instructions, we can't just
746 simply subtract INST_COUNT * INSN_LEN from ADDR. Instead, we use line
747 number information to locate the nearest known instruction boundary,
748 and disassemble forward from there. If we go out of the symbol range
749 during disassembling, we return the lowest address we've got so far and
750 set the number of instructions read to INST_READ. */
753 find_instruction_backward (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
754 int inst_count
, int *inst_read
)
756 /* The vector PCS is used to store instruction addresses within
758 CORE_ADDR loop_start
, loop_end
, p
;
759 std::vector
<CORE_ADDR
> pcs
;
760 struct symtab_and_line sal
;
763 loop_start
= loop_end
= addr
;
765 /* In each iteration of the outer loop, we get a pc range that ends before
766 LOOP_START, then we count and store every instruction address of the range
767 iterated in the loop.
768 If the number of instructions counted reaches INST_COUNT, return the
769 stored address that is located INST_COUNT instructions back from ADDR.
770 If INST_COUNT is not reached, we subtract the number of counted
771 instructions from INST_COUNT, and go to the next iteration. */
775 sal
= find_pc_sect_line (loop_start
, NULL
, 1);
778 /* We reach here when line info is not available. In this case,
779 we print a message and just exit the loop. The return value
780 is calculated after the loop. */
781 printf_filtered (_("No line number information available "
784 print_address (gdbarch
, loop_start
- 1, gdb_stdout
);
785 printf_filtered ("\n");
789 loop_end
= loop_start
;
792 /* This loop pushes instruction addresses in the range from
793 LOOP_START to LOOP_END. */
794 for (p
= loop_start
; p
< loop_end
;)
797 p
+= gdb_insn_length (gdbarch
, p
);
800 inst_count
-= pcs
.size ();
801 *inst_read
+= pcs
.size ();
803 while (inst_count
> 0);
805 /* After the loop, the vector PCS has instruction addresses of the last
806 source line we processed, and INST_COUNT has a negative value.
807 We return the address at the index of -INST_COUNT in the vector for
809 Let's assume the following instruction addresses and run 'x/-4i 0x400e'.
819 find_instruction_backward is called with INST_COUNT = 4 and expected to
820 return 0x4001. When we reach here, INST_COUNT is set to -1 because
821 it was subtracted by 2 (from Line Y) and 3 (from Line X). The value
822 4001 is located at the index 1 of the last iterated line (= Line X),
823 which is simply calculated by -INST_COUNT.
824 The case when the length of PCS is 0 means that we reached an area for
825 which line info is not available. In such case, we return LOOP_START,
826 which was the lowest instruction address that had line info. */
827 p
= pcs
.size () > 0 ? pcs
[-inst_count
] : loop_start
;
829 /* INST_READ includes all instruction addresses in a pc range. Need to
830 exclude the beginning part up to the address we're returning. That
831 is, exclude {0x4000} in the example above. */
833 *inst_read
+= inst_count
;
838 /* Backward read LEN bytes of target memory from address MEMADDR + LEN,
839 placing the results in GDB's memory from MYADDR + LEN. Returns
840 a count of the bytes actually read. */
843 read_memory_backward (struct gdbarch
*gdbarch
,
844 CORE_ADDR memaddr
, gdb_byte
*myaddr
, int len
)
847 int nread
; /* Number of bytes actually read. */
849 /* First try a complete read. */
850 errcode
= target_read_memory (memaddr
, myaddr
, len
);
858 /* Loop, reading one byte at a time until we get as much as we can. */
861 for (nread
= 0; nread
< len
; ++nread
)
863 errcode
= target_read_memory (--memaddr
, --myaddr
, 1);
866 /* The read was unsuccessful, so exit the loop. */
867 printf_filtered (_("Cannot access memory at address %s\n"),
868 paddress (gdbarch
, memaddr
));
876 /* Returns true if X (which is LEN bytes wide) is the number zero. */
879 integer_is_zero (const gdb_byte
*x
, int len
)
883 while (i
< len
&& x
[i
] == 0)
888 /* Find the start address of a string in which ADDR is included.
889 Basically we search for '\0' and return the next address,
890 but if OPTIONS->PRINT_MAX is smaller than the length of a string,
891 we stop searching and return the address to print characters as many as
892 PRINT_MAX from the string. */
895 find_string_backward (struct gdbarch
*gdbarch
,
896 CORE_ADDR addr
, int count
, int char_size
,
897 const struct value_print_options
*options
,
898 int *strings_counted
)
900 const int chunk_size
= 0x20;
901 gdb_byte
*buffer
= NULL
;
902 struct cleanup
*cleanup
= NULL
;
905 int chars_to_read
= chunk_size
;
906 int chars_counted
= 0;
907 int count_original
= count
;
908 CORE_ADDR string_start_addr
= addr
;
910 gdb_assert (char_size
== 1 || char_size
== 2 || char_size
== 4);
911 buffer
= (gdb_byte
*) xmalloc (chars_to_read
* char_size
);
912 cleanup
= make_cleanup (xfree
, buffer
);
913 while (count
> 0 && read_error
== 0)
917 addr
-= chars_to_read
* char_size
;
918 chars_read
= read_memory_backward (gdbarch
, addr
, buffer
,
919 chars_to_read
* char_size
);
920 chars_read
/= char_size
;
921 read_error
= (chars_read
== chars_to_read
) ? 0 : 1;
922 /* Searching for '\0' from the end of buffer in backward direction. */
923 for (i
= 0; i
< chars_read
&& count
> 0 ; ++i
, ++chars_counted
)
925 int offset
= (chars_to_read
- i
- 1) * char_size
;
927 if (integer_is_zero (buffer
+ offset
, char_size
)
928 || chars_counted
== options
->print_max
)
930 /* Found '\0' or reached print_max. As OFFSET is the offset to
931 '\0', we add CHAR_SIZE to return the start address of
934 string_start_addr
= addr
+ offset
+ char_size
;
940 /* Update STRINGS_COUNTED with the actual number of loaded strings. */
941 *strings_counted
= count_original
- count
;
945 /* In error case, STRING_START_ADDR is pointing to the string that
946 was last successfully loaded. Rewind the partially loaded string. */
947 string_start_addr
-= chars_counted
* char_size
;
950 do_cleanups (cleanup
);
951 return string_start_addr
;
954 /* Examine data at address ADDR in format FMT.
955 Fetch it from memory and print on gdb_stdout. */
958 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
963 struct type
*val_type
= NULL
;
966 struct value_print_options opts
;
967 int need_to_update_next_address
= 0;
968 CORE_ADDR addr_rewound
= 0;
973 next_gdbarch
= gdbarch
;
976 /* Instruction format implies fetch single bytes
977 regardless of the specified size.
978 The case of strings is handled in decode_format, only explicit
979 size operator are not changed to 'b'. */
985 /* Pick the appropriate size for an address. */
986 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
988 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
990 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
993 /* Bad value for gdbarch_ptr_bit. */
994 internal_error (__FILE__
, __LINE__
,
995 _("failed internal consistency check"));
999 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
1000 else if (size
== 'h')
1001 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
1002 else if (size
== 'w')
1003 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
1004 else if (size
== 'g')
1005 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
1009 struct type
*char_type
= NULL
;
1011 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
1012 if type is not found. */
1014 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
1015 else if (size
== 'w')
1016 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
1018 val_type
= char_type
;
1021 if (size
!= '\0' && size
!= 'b')
1022 warning (_("Unable to display strings with "
1023 "size '%c', using 'b' instead."), size
);
1025 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
1034 if (format
== 's' || format
== 'i')
1037 get_formatted_print_options (&opts
, format
);
1041 /* This is the negative repeat count case.
1042 We rewind the address based on the given repeat count and format,
1043 then examine memory from there in forward direction. */
1048 next_address
= find_instruction_backward (gdbarch
, addr
, count
,
1051 else if (format
== 's')
1053 next_address
= find_string_backward (gdbarch
, addr
, count
,
1054 TYPE_LENGTH (val_type
),
1059 next_address
= addr
- count
* TYPE_LENGTH (val_type
);
1062 /* The following call to print_formatted updates next_address in every
1063 iteration. In backward case, we store the start address here
1064 and update next_address with it before exiting the function. */
1065 addr_rewound
= (format
== 's'
1066 ? next_address
- TYPE_LENGTH (val_type
)
1068 need_to_update_next_address
= 1;
1071 /* Print as many objects as specified in COUNT, at most maxelts per line,
1072 with the address of the next one at the start of each line. */
1078 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
1079 print_address (next_gdbarch
, next_address
, gdb_stdout
);
1080 printf_filtered (":");
1085 printf_filtered ("\t");
1086 /* Note that print_formatted sets next_address for the next
1088 last_examine_address
= next_address
;
1090 if (last_examine_value
)
1091 value_free (last_examine_value
);
1093 /* The value to be displayed is not fetched greedily.
1094 Instead, to avoid the possibility of a fetched value not
1095 being used, its retrieval is delayed until the print code
1096 uses it. When examining an instruction stream, the
1097 disassembler will perform its own memory fetch using just
1098 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
1099 the disassembler be modified so that LAST_EXAMINE_VALUE
1100 is left with the byte sequence from the last complete
1101 instruction fetched from memory? */
1102 last_examine_value
= value_at_lazy (val_type
, next_address
);
1104 if (last_examine_value
)
1105 release_value (last_examine_value
);
1107 print_formatted (last_examine_value
, size
, &opts
, gdb_stdout
);
1109 /* Display any branch delay slots following the final insn. */
1110 if (format
== 'i' && count
== 1)
1111 count
+= branch_delay_insns
;
1113 printf_filtered ("\n");
1114 gdb_flush (gdb_stdout
);
1117 if (need_to_update_next_address
)
1118 next_address
= addr_rewound
;
1122 validate_format (struct format_data fmt
, const char *cmdname
)
1125 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
1127 error (_("Item count other than 1 is meaningless in \"%s\" command."),
1129 if (fmt
.format
== 'i')
1130 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
1131 fmt
.format
, cmdname
);
1134 /* Parse print command format string into *FMTP and update *EXPP.
1135 CMDNAME should name the current command. */
1138 print_command_parse_format (const char **expp
, const char *cmdname
,
1139 struct format_data
*fmtp
)
1141 const char *exp
= *expp
;
1143 if (exp
&& *exp
== '/')
1146 *fmtp
= decode_format (&exp
, last_format
, 0);
1147 validate_format (*fmtp
, cmdname
);
1148 last_format
= fmtp
->format
;
1161 /* Print VAL to console according to *FMTP, including recording it to
1165 print_value (struct value
*val
, const struct format_data
*fmtp
)
1167 struct value_print_options opts
;
1168 int histindex
= record_latest_value (val
);
1170 annotate_value_history_begin (histindex
, value_type (val
));
1172 printf_filtered ("$%d = ", histindex
);
1174 annotate_value_history_value ();
1176 get_formatted_print_options (&opts
, fmtp
->format
);
1177 opts
.raw
= fmtp
->raw
;
1179 print_formatted (val
, fmtp
->size
, &opts
, gdb_stdout
);
1180 printf_filtered ("\n");
1182 annotate_value_history_end ();
1185 /* Evaluate string EXP as an expression in the current language and
1186 print the resulting value. EXP may contain a format specifier as the
1187 first argument ("/x myvar" for example, to print myvar in hex). */
1190 print_command_1 (const char *exp
, int voidprint
)
1193 struct format_data fmt
;
1195 print_command_parse_format (&exp
, "print", &fmt
);
1199 expression_up expr
= parse_expression (exp
);
1200 val
= evaluate_expression (expr
.get ());
1203 val
= access_value_history (0);
1205 if (voidprint
|| (val
&& value_type (val
) &&
1206 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
1207 print_value (val
, &fmt
);
1211 print_command (char *exp
, int from_tty
)
1213 print_command_1 (exp
, 1);
1216 /* Same as print, except it doesn't print void results. */
1218 call_command (char *exp
, int from_tty
)
1220 print_command_1 (exp
, 0);
1223 /* Implementation of the "output" command. */
1226 output_command (char *exp
, int from_tty
)
1228 output_command_const (exp
, from_tty
);
1231 /* Like output_command, but takes a const string as argument. */
1234 output_command_const (const char *exp
, int from_tty
)
1238 struct format_data fmt
;
1239 struct value_print_options opts
;
1244 if (exp
&& *exp
== '/')
1247 fmt
= decode_format (&exp
, 0, 0);
1248 validate_format (fmt
, "output");
1249 format
= fmt
.format
;
1252 expression_up expr
= parse_expression (exp
);
1254 val
= evaluate_expression (expr
.get ());
1256 annotate_value_begin (value_type (val
));
1258 get_formatted_print_options (&opts
, format
);
1260 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1262 annotate_value_end ();
1265 gdb_flush (gdb_stdout
);
1269 set_command (char *exp
, int from_tty
)
1271 expression_up expr
= parse_expression (exp
);
1273 if (expr
->nelts
>= 1)
1274 switch (expr
->elts
[0].opcode
)
1276 case UNOP_PREINCREMENT
:
1277 case UNOP_POSTINCREMENT
:
1278 case UNOP_PREDECREMENT
:
1279 case UNOP_POSTDECREMENT
:
1281 case BINOP_ASSIGN_MODIFY
:
1286 (_("Expression is not an assignment (and might have no effect)"));
1289 evaluate_expression (expr
.get ());
1293 sym_info (char *arg
, int from_tty
)
1295 struct minimal_symbol
*msymbol
;
1296 struct objfile
*objfile
;
1297 struct obj_section
*osect
;
1298 CORE_ADDR addr
, sect_addr
;
1300 unsigned int offset
;
1303 error_no_arg (_("address"));
1305 addr
= parse_and_eval_address (arg
);
1306 ALL_OBJSECTIONS (objfile
, osect
)
1308 /* Only process each object file once, even if there's a separate
1310 if (objfile
->separate_debug_objfile_backlink
)
1313 sect_addr
= overlay_mapped_address (addr
, osect
);
1315 if (obj_section_addr (osect
) <= sect_addr
1316 && sect_addr
< obj_section_endaddr (osect
)
1318 = lookup_minimal_symbol_by_pc_section (sect_addr
, osect
).minsym
))
1320 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1322 struct cleanup
*old_chain
;
1325 offset
= sect_addr
- MSYMBOL_VALUE_ADDRESS (objfile
, msymbol
);
1326 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1327 sec_name
= osect
->the_bfd_section
->name
;
1328 msym_name
= MSYMBOL_PRINT_NAME (msymbol
);
1330 /* Don't print the offset if it is zero.
1331 We assume there's no need to handle i18n of "sym + offset". */
1333 loc_string
= xstrprintf ("%s + %u", msym_name
, offset
);
1335 loc_string
= xstrprintf ("%s", msym_name
);
1337 /* Use a cleanup to free loc_string in case the user quits
1338 a pagination request inside printf_filtered. */
1339 old_chain
= make_cleanup (xfree
, loc_string
);
1341 gdb_assert (osect
->objfile
&& objfile_name (osect
->objfile
));
1342 obj_name
= objfile_name (osect
->objfile
);
1344 if (MULTI_OBJFILE_P ())
1345 if (pc_in_unmapped_range (addr
, osect
))
1346 if (section_is_overlay (osect
))
1347 printf_filtered (_("%s in load address range of "
1348 "%s overlay section %s of %s\n"),
1349 loc_string
, mapped
, sec_name
, obj_name
);
1351 printf_filtered (_("%s in load address range of "
1352 "section %s of %s\n"),
1353 loc_string
, sec_name
, obj_name
);
1355 if (section_is_overlay (osect
))
1356 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1357 loc_string
, mapped
, sec_name
, obj_name
);
1359 printf_filtered (_("%s in section %s of %s\n"),
1360 loc_string
, sec_name
, obj_name
);
1362 if (pc_in_unmapped_range (addr
, osect
))
1363 if (section_is_overlay (osect
))
1364 printf_filtered (_("%s in load address range of %s overlay "
1366 loc_string
, mapped
, sec_name
);
1368 printf_filtered (_("%s in load address range of section %s\n"),
1369 loc_string
, sec_name
);
1371 if (section_is_overlay (osect
))
1372 printf_filtered (_("%s in %s overlay section %s\n"),
1373 loc_string
, mapped
, sec_name
);
1375 printf_filtered (_("%s in section %s\n"),
1376 loc_string
, sec_name
);
1378 do_cleanups (old_chain
);
1382 printf_filtered (_("No symbol matches %s.\n"), arg
);
1386 address_info (char *exp
, int from_tty
)
1388 struct gdbarch
*gdbarch
;
1391 struct bound_minimal_symbol msymbol
;
1393 struct obj_section
*section
;
1394 CORE_ADDR load_addr
, context_pc
= 0;
1395 struct field_of_this_result is_a_field_of_this
;
1398 error (_("Argument required."));
1400 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1401 &is_a_field_of_this
).symbol
;
1404 if (is_a_field_of_this
.type
!= NULL
)
1406 printf_filtered ("Symbol \"");
1407 fprintf_symbol_filtered (gdb_stdout
, exp
,
1408 current_language
->la_language
, DMGL_ANSI
);
1409 printf_filtered ("\" is a field of the local class variable ");
1410 if (current_language
->la_language
== language_objc
)
1411 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1413 printf_filtered ("`this'\n");
1417 msymbol
= lookup_bound_minimal_symbol (exp
);
1419 if (msymbol
.minsym
!= NULL
)
1421 struct objfile
*objfile
= msymbol
.objfile
;
1423 gdbarch
= get_objfile_arch (objfile
);
1424 load_addr
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
1426 printf_filtered ("Symbol \"");
1427 fprintf_symbol_filtered (gdb_stdout
, exp
,
1428 current_language
->la_language
, DMGL_ANSI
);
1429 printf_filtered ("\" is at ");
1430 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1431 printf_filtered (" in a file compiled without debugging");
1432 section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
.minsym
);
1433 if (section_is_overlay (section
))
1435 load_addr
= overlay_unmapped_address (load_addr
, section
);
1436 printf_filtered (",\n -- loaded at ");
1437 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1438 printf_filtered (" in overlay section %s",
1439 section
->the_bfd_section
->name
);
1441 printf_filtered (".\n");
1444 error (_("No symbol \"%s\" in current context."), exp
);
1448 printf_filtered ("Symbol \"");
1449 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1450 current_language
->la_language
, DMGL_ANSI
);
1451 printf_filtered ("\" is ");
1452 val
= SYMBOL_VALUE (sym
);
1453 if (SYMBOL_OBJFILE_OWNED (sym
))
1454 section
= SYMBOL_OBJ_SECTION (symbol_objfile (sym
), sym
);
1457 gdbarch
= symbol_arch (sym
);
1459 if (SYMBOL_COMPUTED_OPS (sym
) != NULL
)
1461 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1463 printf_filtered (".\n");
1467 switch (SYMBOL_CLASS (sym
))
1470 case LOC_CONST_BYTES
:
1471 printf_filtered ("constant");
1475 printf_filtered ("a label at address ");
1476 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1477 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1478 if (section_is_overlay (section
))
1480 load_addr
= overlay_unmapped_address (load_addr
, section
);
1481 printf_filtered (",\n -- loaded at ");
1482 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1483 printf_filtered (" in overlay section %s",
1484 section
->the_bfd_section
->name
);
1489 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1492 /* GDBARCH is the architecture associated with the objfile the symbol
1493 is defined in; the target architecture may be different, and may
1494 provide additional registers. However, we do not know the target
1495 architecture at this point. We assume the objfile architecture
1496 will contain all the standard registers that occur in debug info
1498 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1500 if (SYMBOL_IS_ARGUMENT (sym
))
1501 printf_filtered (_("an argument in register %s"),
1502 gdbarch_register_name (gdbarch
, regno
));
1504 printf_filtered (_("a variable in register %s"),
1505 gdbarch_register_name (gdbarch
, regno
));
1509 printf_filtered (_("static storage at address "));
1510 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1511 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1512 if (section_is_overlay (section
))
1514 load_addr
= overlay_unmapped_address (load_addr
, section
);
1515 printf_filtered (_(",\n -- loaded at "));
1516 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1517 printf_filtered (_(" in overlay section %s"),
1518 section
->the_bfd_section
->name
);
1522 case LOC_REGPARM_ADDR
:
1523 /* Note comment at LOC_REGISTER. */
1524 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1525 printf_filtered (_("address of an argument in register %s"),
1526 gdbarch_register_name (gdbarch
, regno
));
1530 printf_filtered (_("an argument at offset %ld"), val
);
1534 printf_filtered (_("a local variable at frame offset %ld"), val
);
1538 printf_filtered (_("a reference argument at offset %ld"), val
);
1542 printf_filtered (_("a typedef"));
1546 printf_filtered (_("a function at address "));
1547 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1548 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1549 if (section_is_overlay (section
))
1551 load_addr
= overlay_unmapped_address (load_addr
, section
);
1552 printf_filtered (_(",\n -- loaded at "));
1553 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1554 printf_filtered (_(" in overlay section %s"),
1555 section
->the_bfd_section
->name
);
1559 case LOC_UNRESOLVED
:
1561 struct bound_minimal_symbol msym
;
1563 msym
= lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym
));
1564 if (msym
.minsym
== NULL
)
1565 printf_filtered ("unresolved");
1568 section
= MSYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
);
1571 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1573 load_addr
= MSYMBOL_VALUE_RAW_ADDRESS (msym
.minsym
);
1574 printf_filtered (_("a thread-local variable at offset %s "
1575 "in the thread-local storage for `%s'"),
1576 paddress (gdbarch
, load_addr
),
1577 objfile_name (section
->objfile
));
1581 load_addr
= BMSYMBOL_VALUE_ADDRESS (msym
);
1582 printf_filtered (_("static storage at address "));
1583 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1584 if (section_is_overlay (section
))
1586 load_addr
= overlay_unmapped_address (load_addr
, section
);
1587 printf_filtered (_(",\n -- loaded at "));
1588 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1589 printf_filtered (_(" in overlay section %s"),
1590 section
->the_bfd_section
->name
);
1597 case LOC_OPTIMIZED_OUT
:
1598 printf_filtered (_("optimized out"));
1602 printf_filtered (_("of unknown (botched) type"));
1605 printf_filtered (".\n");
1610 x_command (char *exp
, int from_tty
)
1612 struct format_data fmt
;
1613 struct cleanup
*old_chain
;
1616 fmt
.format
= last_format
? last_format
: 'x';
1617 fmt
.size
= last_size
;
1621 if (exp
&& *exp
== '/')
1623 const char *tmp
= exp
+ 1;
1625 fmt
= decode_format (&tmp
, last_format
, last_size
);
1629 /* If we have an expression, evaluate it and use it as the address. */
1631 if (exp
!= 0 && *exp
!= 0)
1633 expression_up expr
= parse_expression (exp
);
1634 /* Cause expression not to be there any more if this command is
1635 repeated with Newline. But don't clobber a user-defined
1636 command's definition. */
1639 val
= evaluate_expression (expr
.get ());
1640 if (TYPE_IS_REFERENCE (value_type (val
)))
1641 val
= coerce_ref (val
);
1642 /* In rvalue contexts, such as this, functions are coerced into
1643 pointers to functions. This makes "x/i main" work. */
1644 if (/* last_format == 'i' && */
1645 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1646 && VALUE_LVAL (val
) == lval_memory
)
1647 next_address
= value_address (val
);
1649 next_address
= value_as_address (val
);
1651 next_gdbarch
= expr
->gdbarch
;
1655 error_no_arg (_("starting display address"));
1657 do_examine (fmt
, next_gdbarch
, next_address
);
1659 /* If the examine succeeds, we remember its size and format for next
1660 time. Set last_size to 'b' for strings. */
1661 if (fmt
.format
== 's')
1664 last_size
= fmt
.size
;
1665 last_format
= fmt
.format
;
1667 /* Set a couple of internal variables if appropriate. */
1668 if (last_examine_value
)
1670 /* Make last address examined available to the user as $_. Use
1671 the correct pointer type. */
1672 struct type
*pointer_type
1673 = lookup_pointer_type (value_type (last_examine_value
));
1674 set_internalvar (lookup_internalvar ("_"),
1675 value_from_pointer (pointer_type
,
1676 last_examine_address
));
1678 /* Make contents of last address examined available to the user
1679 as $__. If the last value has not been fetched from memory
1680 then don't fetch it now; instead mark it by voiding the $__
1682 if (value_lazy (last_examine_value
))
1683 clear_internalvar (lookup_internalvar ("__"));
1685 set_internalvar (lookup_internalvar ("__"), last_examine_value
);
1690 /* Add an expression to the auto-display chain.
1691 Specify the expression. */
1694 display_command (char *arg
, int from_tty
)
1696 struct format_data fmt
;
1697 struct display
*newobj
;
1698 const char *exp
= arg
;
1709 fmt
= decode_format (&exp
, 0, 0);
1710 if (fmt
.size
&& fmt
.format
== 0)
1712 if (fmt
.format
== 'i' || fmt
.format
== 's')
1723 innermost_block
= NULL
;
1724 expression_up expr
= parse_expression (exp
);
1726 newobj
= new display ();
1728 newobj
->exp_string
= xstrdup (exp
);
1729 newobj
->exp
= std::move (expr
);
1730 newobj
->block
= innermost_block
;
1731 newobj
->pspace
= current_program_space
;
1732 newobj
->number
= ++display_number
;
1733 newobj
->format
= fmt
;
1734 newobj
->enabled_p
= 1;
1735 newobj
->next
= NULL
;
1737 if (display_chain
== NULL
)
1738 display_chain
= newobj
;
1741 struct display
*last
;
1743 for (last
= display_chain
; last
->next
!= NULL
; last
= last
->next
)
1745 last
->next
= newobj
;
1749 do_one_display (newobj
);
1755 free_display (struct display
*d
)
1757 xfree (d
->exp_string
);
1761 /* Clear out the display_chain. Done when new symtabs are loaded,
1762 since this invalidates the types stored in many expressions. */
1765 clear_displays (void)
1769 while ((d
= display_chain
) != NULL
)
1771 display_chain
= d
->next
;
1776 /* Delete the auto-display DISPLAY. */
1779 delete_display (struct display
*display
)
1783 gdb_assert (display
!= NULL
);
1785 if (display_chain
== display
)
1786 display_chain
= display
->next
;
1789 if (d
->next
== display
)
1791 d
->next
= display
->next
;
1795 free_display (display
);
1798 /* Call FUNCTION on each of the displays whose numbers are given in
1799 ARGS. DATA is passed unmodified to FUNCTION. */
1802 map_display_numbers (char *args
,
1803 void (*function
) (struct display
*,
1810 error_no_arg (_("one or more display numbers"));
1812 number_or_range_parser
parser (args
);
1814 while (!parser
.finished ())
1816 const char *p
= parser
.cur_tok ();
1818 num
= parser
.get_number ();
1820 warning (_("bad display number at or near '%s'"), p
);
1823 struct display
*d
, *tmp
;
1825 ALL_DISPLAYS_SAFE (d
, tmp
)
1826 if (d
->number
== num
)
1829 printf_unfiltered (_("No display number %d.\n"), num
);
1836 /* Callback for map_display_numbers, that deletes a display. */
1839 do_delete_display (struct display
*d
, void *data
)
1844 /* "undisplay" command. */
1847 undisplay_command (char *args
, int from_tty
)
1851 if (query (_("Delete all auto-display expressions? ")))
1857 map_display_numbers (args
, do_delete_display
, NULL
);
1861 /* Display a single auto-display.
1862 Do nothing if the display cannot be printed in the current context,
1863 or if the display is disabled. */
1866 do_one_display (struct display
*d
)
1868 int within_current_scope
;
1870 if (d
->enabled_p
== 0)
1873 /* The expression carries the architecture that was used at parse time.
1874 This is a problem if the expression depends on architecture features
1875 (e.g. register numbers), and the current architecture is now different.
1876 For example, a display statement like "display/i $pc" is expected to
1877 display the PC register of the current architecture, not the arch at
1878 the time the display command was given. Therefore, we re-parse the
1879 expression if the current architecture has changed. */
1880 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1891 innermost_block
= NULL
;
1892 d
->exp
= parse_expression (d
->exp_string
);
1893 d
->block
= innermost_block
;
1895 CATCH (ex
, RETURN_MASK_ALL
)
1897 /* Can't re-parse the expression. Disable this display item. */
1899 warning (_("Unable to display \"%s\": %s"),
1900 d
->exp_string
, ex
.message
);
1908 if (d
->pspace
== current_program_space
)
1909 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1911 within_current_scope
= 0;
1914 within_current_scope
= 1;
1915 if (!within_current_scope
)
1918 scoped_restore save_display_number
1919 = make_scoped_restore (¤t_display_number
, d
->number
);
1921 annotate_display_begin ();
1922 printf_filtered ("%d", d
->number
);
1923 annotate_display_number_end ();
1924 printf_filtered (": ");
1928 annotate_display_format ();
1930 printf_filtered ("x/");
1931 if (d
->format
.count
!= 1)
1932 printf_filtered ("%d", d
->format
.count
);
1933 printf_filtered ("%c", d
->format
.format
);
1934 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1935 printf_filtered ("%c", d
->format
.size
);
1936 printf_filtered (" ");
1938 annotate_display_expression ();
1940 puts_filtered (d
->exp_string
);
1941 annotate_display_expression_end ();
1943 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1944 printf_filtered ("\n");
1946 printf_filtered (" ");
1948 annotate_display_value ();
1955 val
= evaluate_expression (d
->exp
.get ());
1956 addr
= value_as_address (val
);
1957 if (d
->format
.format
== 'i')
1958 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1959 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1961 CATCH (ex
, RETURN_MASK_ERROR
)
1963 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1969 struct value_print_options opts
;
1971 annotate_display_format ();
1973 if (d
->format
.format
)
1974 printf_filtered ("/%c ", d
->format
.format
);
1976 annotate_display_expression ();
1978 puts_filtered (d
->exp_string
);
1979 annotate_display_expression_end ();
1981 printf_filtered (" = ");
1983 annotate_display_expression ();
1985 get_formatted_print_options (&opts
, d
->format
.format
);
1986 opts
.raw
= d
->format
.raw
;
1992 val
= evaluate_expression (d
->exp
.get ());
1993 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1995 CATCH (ex
, RETURN_MASK_ERROR
)
1997 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
2001 printf_filtered ("\n");
2004 annotate_display_end ();
2006 gdb_flush (gdb_stdout
);
2009 /* Display all of the values on the auto-display chain which can be
2010 evaluated in the current scope. */
2017 for (d
= display_chain
; d
; d
= d
->next
)
2021 /* Delete the auto-display which we were in the process of displaying.
2022 This is done when there is an error or a signal. */
2025 disable_display (int num
)
2029 for (d
= display_chain
; d
; d
= d
->next
)
2030 if (d
->number
== num
)
2035 printf_unfiltered (_("No display number %d.\n"), num
);
2039 disable_current_display (void)
2041 if (current_display_number
>= 0)
2043 disable_display (current_display_number
);
2044 fprintf_unfiltered (gdb_stderr
,
2045 _("Disabling display %d to "
2046 "avoid infinite recursion.\n"),
2047 current_display_number
);
2049 current_display_number
= -1;
2053 display_info (char *ignore
, int from_tty
)
2058 printf_unfiltered (_("There are no auto-display expressions now.\n"));
2060 printf_filtered (_("Auto-display expressions now in effect:\n\
2061 Num Enb Expression\n"));
2063 for (d
= display_chain
; d
; d
= d
->next
)
2065 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
2067 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
2069 else if (d
->format
.format
)
2070 printf_filtered ("/%c ", d
->format
.format
);
2071 puts_filtered (d
->exp_string
);
2072 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
2073 printf_filtered (_(" (cannot be evaluated in the current context)"));
2074 printf_filtered ("\n");
2075 gdb_flush (gdb_stdout
);
2079 /* Callback fo map_display_numbers, that enables or disables the
2080 passed in display D. */
2083 do_enable_disable_display (struct display
*d
, void *data
)
2085 d
->enabled_p
= *(int *) data
;
2088 /* Implamentation of both the "disable display" and "enable display"
2089 commands. ENABLE decides what to do. */
2092 enable_disable_display_command (char *args
, int from_tty
, int enable
)
2099 d
->enabled_p
= enable
;
2103 map_display_numbers (args
, do_enable_disable_display
, &enable
);
2106 /* The "enable display" command. */
2109 enable_display_command (char *args
, int from_tty
)
2111 enable_disable_display_command (args
, from_tty
, 1);
2114 /* The "disable display" command. */
2117 disable_display_command (char *args
, int from_tty
)
2119 enable_disable_display_command (args
, from_tty
, 0);
2122 /* display_chain items point to blocks and expressions. Some expressions in
2123 turn may point to symbols.
2124 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
2125 obstack_free'd when a shared library is unloaded.
2126 Clear pointers that are about to become dangling.
2127 Both .exp and .block fields will be restored next time we need to display
2128 an item by re-parsing .exp_string field in the new execution context. */
2131 clear_dangling_display_expressions (struct objfile
*objfile
)
2134 struct program_space
*pspace
;
2136 /* With no symbol file we cannot have a block or expression from it. */
2137 if (objfile
== NULL
)
2139 pspace
= objfile
->pspace
;
2140 if (objfile
->separate_debug_objfile_backlink
)
2142 objfile
= objfile
->separate_debug_objfile_backlink
;
2143 gdb_assert (objfile
->pspace
== pspace
);
2146 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
2148 if (d
->pspace
!= pspace
)
2151 if (lookup_objfile_from_block (d
->block
) == objfile
2152 || (d
->exp
!= NULL
&& exp_uses_objfile (d
->exp
.get (), objfile
)))
2161 /* Print the value in stack frame FRAME of a variable specified by a
2162 struct symbol. NAME is the name to print; if NULL then VAR's print
2163 name will be used. STREAM is the ui_file on which to print the
2164 value. INDENT specifies the number of indent levels to print
2165 before printing the variable name.
2167 This function invalidates FRAME. */
2170 print_variable_and_value (const char *name
, struct symbol
*var
,
2171 struct frame_info
*frame
,
2172 struct ui_file
*stream
, int indent
)
2176 name
= SYMBOL_PRINT_NAME (var
);
2178 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
2182 struct value_print_options opts
;
2184 /* READ_VAR_VALUE needs a block in order to deal with non-local
2185 references (i.e. to handle nested functions). In this context, we
2186 print variables that are local to this frame, so we can avoid passing
2188 val
= read_var_value (var
, NULL
, frame
);
2189 get_user_print_options (&opts
);
2191 common_val_print (val
, stream
, indent
, &opts
, current_language
);
2193 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2197 CATCH (except
, RETURN_MASK_ERROR
)
2199 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
2204 fprintf_filtered (stream
, "\n");
2207 /* Subroutine of ui_printf to simplify it.
2208 Print VALUE to STREAM using FORMAT.
2209 VALUE is a C-style string on the target. */
2212 printf_c_string (struct ui_file
*stream
, const char *format
,
2213 struct value
*value
)
2219 tem
= value_as_address (value
);
2221 /* This is a %s argument. Find the length of the string. */
2227 read_memory (tem
+ j
, &c
, 1);
2232 /* Copy the string contents into a string inside GDB. */
2233 str
= (gdb_byte
*) alloca (j
+ 1);
2235 read_memory (tem
, str
, j
);
2238 fprintf_filtered (stream
, format
, (char *) str
);
2241 /* Subroutine of ui_printf to simplify it.
2242 Print VALUE to STREAM using FORMAT.
2243 VALUE is a wide C-style string on the target. */
2246 printf_wide_c_string (struct ui_file
*stream
, const char *format
,
2247 struct value
*value
)
2252 struct gdbarch
*gdbarch
= get_type_arch (value_type (value
));
2253 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2254 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2255 "wchar_t", NULL
, 0);
2256 int wcwidth
= TYPE_LENGTH (wctype
);
2257 gdb_byte
*buf
= (gdb_byte
*) alloca (wcwidth
);
2259 tem
= value_as_address (value
);
2261 /* This is a %s argument. Find the length of the string. */
2262 for (j
= 0;; j
+= wcwidth
)
2265 read_memory (tem
+ j
, buf
, wcwidth
);
2266 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2270 /* Copy the string contents into a string inside GDB. */
2271 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2273 read_memory (tem
, str
, j
);
2274 memset (&str
[j
], 0, wcwidth
);
2276 auto_obstack output
;
2278 convert_between_encodings (target_wide_charset (gdbarch
),
2281 &output
, translit_char
);
2282 obstack_grow_str0 (&output
, "");
2284 fprintf_filtered (stream
, format
, obstack_base (&output
));
2287 /* Subroutine of ui_printf to simplify it.
2288 Print VALUE, a decimal floating point value, to STREAM using FORMAT. */
2291 printf_decfloat (struct ui_file
*stream
, const char *format
,
2292 struct value
*value
)
2294 const gdb_byte
*param_ptr
= value_contents (value
);
2296 #if defined (PRINTF_HAS_DECFLOAT)
2297 /* If we have native support for Decimal floating
2298 printing, handle it here. */
2299 fprintf_filtered (stream
, format
, param_ptr
);
2301 /* As a workaround until vasprintf has native support for DFP
2302 we convert the DFP values to string and print them using
2303 the %s format specifier. */
2306 /* Parameter data. */
2307 struct type
*param_type
= value_type (value
);
2308 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2309 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2311 /* DFP output data. */
2312 struct value
*dfp_value
= NULL
;
2316 struct type
*dfp_type
= NULL
;
2317 char decstr
[MAX_DECIMAL_STRING
];
2319 /* Points to the end of the string so that we can go back
2320 and check for DFP length modifiers. */
2321 p
= format
+ strlen (format
);
2323 /* Look for the float/double format specifier. */
2324 while (*p
!= 'f' && *p
!= 'e' && *p
!= 'E'
2325 && *p
!= 'g' && *p
!= 'G')
2328 /* Search for the '%' char and extract the size and type of
2329 the output decimal value based on its modifiers
2330 (%Hf, %Df, %DDf). */
2336 dfp_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2338 else if (*p
== 'D' && *(p
- 1) == 'D')
2341 dfp_type
= builtin_type (gdbarch
)->builtin_declong
;
2347 dfp_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2351 /* Conversion between different DFP types. */
2352 if (TYPE_CODE (param_type
) == TYPE_CODE_DECFLOAT
)
2353 decimal_convert (param_ptr
, TYPE_LENGTH (param_type
),
2354 byte_order
, dec
, dfp_len
, byte_order
);
2356 /* If this is a non-trivial conversion, just output 0.
2357 A correct converted value can be displayed by explicitly
2358 casting to a DFP type. */
2359 decimal_from_string (dec
, dfp_len
, byte_order
, "0");
2361 dfp_value
= value_from_decfloat (dfp_type
, dec
);
2363 dfp_ptr
= (gdb_byte
*) value_contents (dfp_value
);
2365 decimal_to_string (dfp_ptr
, dfp_len
, byte_order
, decstr
);
2367 /* Print the DFP value. */
2368 fprintf_filtered (stream
, "%s", decstr
);
2372 /* Subroutine of ui_printf to simplify it.
2373 Print VALUE, a target pointer, to STREAM using FORMAT. */
2376 printf_pointer (struct ui_file
*stream
, const char *format
,
2377 struct value
*value
)
2379 /* We avoid the host's %p because pointers are too
2380 likely to be the wrong size. The only interesting
2381 modifier for %p is a width; extract that, and then
2382 handle %p as glibc would: %#x or a literal "(nil)". */
2386 #ifdef PRINTF_HAS_LONG_LONG
2387 long long val
= value_as_long (value
);
2389 long val
= value_as_long (value
);
2392 fmt
= (char *) alloca (strlen (format
) + 5);
2394 /* Copy up to the leading %. */
2399 int is_percent
= (*p
== '%');
2414 /* Copy any width. */
2415 while (*p
>= '0' && *p
< '9')
2418 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2421 #ifdef PRINTF_HAS_LONG_LONG
2427 fprintf_filtered (stream
, fmt
, val
);
2433 fprintf_filtered (stream
, fmt
, "(nil)");
2437 /* printf "printf format string" ARG to STREAM. */
2440 ui_printf (const char *arg
, struct ui_file
*stream
)
2442 struct format_piece
*fpieces
;
2443 const char *s
= arg
;
2444 struct value
**val_args
;
2445 int allocated_args
= 20;
2446 struct cleanup
*old_cleanups
;
2448 val_args
= XNEWVEC (struct value
*, allocated_args
);
2449 old_cleanups
= make_cleanup (free_current_contents
, &val_args
);
2452 error_no_arg (_("format-control string and values to print"));
2454 s
= skip_spaces_const (s
);
2456 /* A format string should follow, enveloped in double quotes. */
2458 error (_("Bad format string, missing '\"'."));
2460 fpieces
= parse_format_string (&s
);
2462 make_cleanup (free_format_pieces_cleanup
, &fpieces
);
2465 error (_("Bad format string, non-terminated '\"'."));
2467 s
= skip_spaces_const (s
);
2469 if (*s
!= ',' && *s
!= 0)
2470 error (_("Invalid argument syntax"));
2474 s
= skip_spaces_const (s
);
2480 char *current_substring
;
2483 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2484 if (fpieces
[fr
].argclass
!= literal_piece
)
2487 /* Now, parse all arguments and evaluate them.
2488 Store the VALUEs in VAL_ARGS. */
2494 if (nargs
== allocated_args
)
2495 val_args
= (struct value
**) xrealloc ((char *) val_args
,
2496 (allocated_args
*= 2)
2497 * sizeof (struct value
*));
2499 val_args
[nargs
] = parse_to_comma_and_eval (&s1
);
2507 if (nargs
!= nargs_wanted
)
2508 error (_("Wrong number of arguments for specified format-string"));
2510 /* Now actually print them. */
2512 for (fr
= 0; fpieces
[fr
].string
!= NULL
; fr
++)
2514 current_substring
= fpieces
[fr
].string
;
2515 switch (fpieces
[fr
].argclass
)
2518 printf_c_string (stream
, current_substring
, val_args
[i
]);
2520 case wide_string_arg
:
2521 printf_wide_c_string (stream
, current_substring
, val_args
[i
]);
2525 struct gdbarch
*gdbarch
2526 = get_type_arch (value_type (val_args
[i
]));
2527 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2528 "wchar_t", NULL
, 0);
2529 struct type
*valtype
;
2530 const gdb_byte
*bytes
;
2532 valtype
= value_type (val_args
[i
]);
2533 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2534 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2535 error (_("expected wchar_t argument for %%lc"));
2537 bytes
= value_contents (val_args
[i
]);
2539 auto_obstack output
;
2541 convert_between_encodings (target_wide_charset (gdbarch
),
2543 bytes
, TYPE_LENGTH (valtype
),
2544 TYPE_LENGTH (valtype
),
2545 &output
, translit_char
);
2546 obstack_grow_str0 (&output
, "");
2548 fprintf_filtered (stream
, current_substring
,
2549 obstack_base (&output
));
2554 struct type
*type
= value_type (val_args
[i
]);
2558 /* If format string wants a float, unchecked-convert the value
2559 to floating point of the same size. */
2560 type
= float_type_from_length (type
);
2561 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2563 error (_("Invalid floating value found in program."));
2565 fprintf_filtered (stream
, current_substring
, (double) val
);
2568 case long_double_arg
:
2569 #ifdef HAVE_LONG_DOUBLE
2571 struct type
*type
= value_type (val_args
[i
]);
2575 /* If format string wants a float, unchecked-convert the value
2576 to floating point of the same size. */
2577 type
= float_type_from_length (type
);
2578 val
= unpack_double (type
, value_contents (val_args
[i
]), &inv
);
2580 error (_("Invalid floating value found in program."));
2582 fprintf_filtered (stream
, current_substring
,
2587 error (_("long double not supported in printf"));
2590 #ifdef PRINTF_HAS_LONG_LONG
2592 long long val
= value_as_long (val_args
[i
]);
2594 fprintf_filtered (stream
, current_substring
, val
);
2598 error (_("long long not supported in printf"));
2602 int val
= value_as_long (val_args
[i
]);
2604 fprintf_filtered (stream
, current_substring
, val
);
2609 long val
= value_as_long (val_args
[i
]);
2611 fprintf_filtered (stream
, current_substring
, val
);
2614 /* Handles decimal floating values. */
2616 printf_decfloat (stream
, current_substring
, val_args
[i
]);
2619 printf_pointer (stream
, current_substring
, val_args
[i
]);
2622 /* Print a portion of the format string that has no
2623 directives. Note that this will not include any
2624 ordinary %-specs, but it might include "%%". That is
2625 why we use printf_filtered and not puts_filtered here.
2626 Also, we pass a dummy argument because some platforms
2627 have modified GCC to include -Wformat-security by
2628 default, which will warn here if there is no
2630 fprintf_filtered (stream
, current_substring
, 0);
2633 internal_error (__FILE__
, __LINE__
,
2634 _("failed internal consistency check"));
2636 /* Maybe advance to the next argument. */
2637 if (fpieces
[fr
].argclass
!= literal_piece
)
2641 do_cleanups (old_cleanups
);
2644 /* Implement the "printf" command. */
2647 printf_command (char *arg
, int from_tty
)
2649 ui_printf (arg
, gdb_stdout
);
2650 gdb_flush (gdb_stdout
);
2653 /* Implement the "eval" command. */
2656 eval_command (char *arg
, int from_tty
)
2660 ui_printf (arg
, &stb
);
2662 std::string expanded
= insert_user_defined_cmd_args (stb
.c_str ());
2664 execute_command (&expanded
[0], from_tty
);
2668 _initialize_printcmd (void)
2670 struct cmd_list_element
*c
;
2672 current_display_number
= -1;
2674 observer_attach_free_objfile (clear_dangling_display_expressions
);
2676 add_info ("address", address_info
,
2677 _("Describe where symbol SYM is stored."));
2679 add_info ("symbol", sym_info
, _("\
2680 Describe what symbol is at location ADDR.\n\
2681 Only for symbols with fixed locations (global or static scope)."));
2683 add_com ("x", class_vars
, x_command
, _("\
2684 Examine memory: x/FMT ADDRESS.\n\
2685 ADDRESS is an expression for the memory address to examine.\n\
2686 FMT is a repeat count followed by a format letter and a size letter.\n\
2687 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2688 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2689 and z(hex, zero padded on the left).\n\
2690 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2691 The specified number of objects of the specified size are printed\n\
2692 according to the format. If a negative number is specified, memory is\n\
2693 examined backward from the address.\n\n\
2694 Defaults for format and size letters are those previously used.\n\
2695 Default count is 1. Default address is following last thing printed\n\
2696 with this command or \"print\"."));
2699 add_com ("whereis", class_vars
, whereis_command
,
2700 _("Print line number and file of definition of variable."));
2703 add_info ("display", display_info
, _("\
2704 Expressions to display when program stops, with code numbers."));
2706 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2707 Cancel some expressions to be displayed when program stops.\n\
2708 Arguments are the code numbers of the expressions to stop displaying.\n\
2709 No argument means cancel all automatic-display expressions.\n\
2710 \"delete display\" has the same effect as this command.\n\
2711 Do \"info display\" to see current list of code numbers."),
2714 add_com ("display", class_vars
, display_command
, _("\
2715 Print value of expression EXP each time the program stops.\n\
2716 /FMT may be used before EXP as in the \"print\" command.\n\
2717 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2718 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2719 and examining is done as in the \"x\" command.\n\n\
2720 With no argument, display all currently requested auto-display expressions.\n\
2721 Use \"undisplay\" to cancel display requests previously made."));
2723 add_cmd ("display", class_vars
, enable_display_command
, _("\
2724 Enable some expressions to be displayed when program stops.\n\
2725 Arguments are the code numbers of the expressions to resume displaying.\n\
2726 No argument means enable all automatic-display expressions.\n\
2727 Do \"info display\" to see current list of code numbers."), &enablelist
);
2729 add_cmd ("display", class_vars
, disable_display_command
, _("\
2730 Disable some expressions to be displayed when program stops.\n\
2731 Arguments are the code numbers of the expressions to stop displaying.\n\
2732 No argument means disable all automatic-display expressions.\n\
2733 Do \"info display\" to see current list of code numbers."), &disablelist
);
2735 add_cmd ("display", class_vars
, undisplay_command
, _("\
2736 Cancel some expressions to be displayed when program stops.\n\
2737 Arguments are the code numbers of the expressions to stop displaying.\n\
2738 No argument means cancel all automatic-display expressions.\n\
2739 Do \"info display\" to see current list of code numbers."), &deletelist
);
2741 add_com ("printf", class_vars
, printf_command
, _("\
2742 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2743 This is useful for formatted output in user-defined commands."));
2745 add_com ("output", class_vars
, output_command
, _("\
2746 Like \"print\" but don't put in value history and don't print newline.\n\
2747 This is useful in user-defined commands."));
2749 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2750 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2751 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2752 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2753 with $), a register (a few standard names starting with $), or an actual\n\
2754 variable in the program being debugged. EXP is any valid expression.\n\
2755 Use \"set variable\" for variables with names identical to set subcommands.\n\
2757 With a subcommand, this command modifies parts of the gdb environment.\n\
2758 You can see these environment settings with the \"show\" command."),
2759 &setlist
, "set ", 1, &cmdlist
);
2761 add_com ("assign", class_vars
, set_command
, _("\
2762 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2763 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2764 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2765 with $), a register (a few standard names starting with $), or an actual\n\
2766 variable in the program being debugged. EXP is any valid expression.\n\
2767 Use \"set variable\" for variables with names identical to set subcommands.\n\
2768 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2769 You can see these environment settings with the \"show\" command."));
2771 /* "call" is the same as "set", but handy for dbx users to call fns. */
2772 c
= add_com ("call", class_vars
, call_command
, _("\
2773 Call a function in the program.\n\
2774 The argument is the function name and arguments, in the notation of the\n\
2775 current working language. The result is printed and saved in the value\n\
2776 history, if it is not void."));
2777 set_cmd_completer (c
, expression_completer
);
2779 add_cmd ("variable", class_vars
, set_command
, _("\
2780 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2781 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2782 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2783 with $), a register (a few standard names starting with $), or an actual\n\
2784 variable in the program being debugged. EXP is any valid expression.\n\
2785 This may usually be abbreviated to simply \"set\"."),
2788 c
= add_com ("print", class_vars
, print_command
, _("\
2789 Print value of expression EXP.\n\
2790 Variables accessible are those of the lexical environment of the selected\n\
2791 stack frame, plus all those whose scope is global or an entire file.\n\
2793 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2794 $$NUM refers to NUM'th value back from the last one.\n\
2795 Names starting with $ refer to registers (with the values they would have\n\
2796 if the program were to return to the stack frame now selected, restoring\n\
2797 all registers saved by frames farther in) or else to debugger\n\
2798 \"convenience\" variables (any such name not a known register).\n\
2799 Use assignment expressions to give values to convenience variables.\n\
2801 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2802 @ is a binary operator for treating consecutive data objects\n\
2803 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2804 element is FOO, whose second element is stored in the space following\n\
2805 where FOO is stored, etc. FOO must be an expression whose value\n\
2806 resides in memory.\n\
2808 EXP may be preceded with /FMT, where FMT is a format letter\n\
2809 but no count or size letter (see \"x\" command)."));
2810 set_cmd_completer (c
, expression_completer
);
2811 add_com_alias ("p", "print", class_vars
, 1);
2812 add_com_alias ("inspect", "print", class_vars
, 1);
2814 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2815 &max_symbolic_offset
, _("\
2816 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2817 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2818 Tell GDB to only display the symbolic form of an address if the\n\
2819 offset between the closest earlier symbol and the address is less than\n\
2820 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2821 to always print the symbolic form of an address if any symbol precedes\n\
2822 it. Zero is equivalent to \"unlimited\"."),
2824 show_max_symbolic_offset
,
2825 &setprintlist
, &showprintlist
);
2826 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2827 &print_symbol_filename
, _("\
2828 Set printing of source filename and line number with <symbol>."), _("\
2829 Show printing of source filename and line number with <symbol>."), NULL
,
2831 show_print_symbol_filename
,
2832 &setprintlist
, &showprintlist
);
2834 add_com ("eval", no_class
, eval_command
, _("\
2835 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2836 a command line, and call it."));