1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2018 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 */
41 #include "target-float.h"
42 #include "observable.h"
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 value_ref_ptr 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 local functions. */
163 static void do_one_display (struct display
*);
166 /* Decode a format specification. *STRING_PTR should point to it.
167 OFORMAT and OSIZE are used as defaults for the format and size
168 if none are given in the format specification.
169 If OSIZE is zero, then the size field of the returned value
170 should be set only if a size is explicitly specified by the
172 The structure returned describes all the data
173 found in the specification. In addition, *STRING_PTR is advanced
174 past the specification and past all whitespace following it. */
176 static struct format_data
177 decode_format (const char **string_ptr
, int oformat
, int osize
)
179 struct format_data val
;
180 const char *p
= *string_ptr
;
192 if (*p
>= '0' && *p
<= '9')
193 val
.count
*= atoi (p
);
194 while (*p
>= '0' && *p
<= '9')
197 /* Now process size or format letters that follow. */
201 if (*p
== 'b' || *p
== 'h' || *p
== 'w' || *p
== 'g')
208 else if (*p
>= 'a' && *p
<= 'z')
214 while (*p
== ' ' || *p
== '\t')
218 /* Set defaults for format and size if not specified. */
219 if (val
.format
== '?')
223 /* Neither has been specified. */
224 val
.format
= oformat
;
228 /* If a size is specified, any format makes a reasonable
229 default except 'i'. */
230 val
.format
= oformat
== 'i' ? 'x' : oformat
;
232 else if (val
.size
== '?')
236 /* Pick the appropriate size for an address. This is deferred
237 until do_examine when we know the actual architecture to use.
238 A special size value of 'a' is used to indicate this case. */
239 val
.size
= osize
? 'a' : osize
;
242 /* Floating point has to be word or giantword. */
243 if (osize
== 'w' || osize
== 'g')
246 /* Default it to giantword if the last used size is not
248 val
.size
= osize
? 'g' : osize
;
251 /* Characters default to one byte. */
252 val
.size
= osize
? 'b' : osize
;
255 /* Display strings with byte size chars unless explicitly
261 /* The default is the size most recently specified. */
268 /* Print value VAL on stream according to OPTIONS.
269 Do not end with a newline.
270 SIZE is the letter for the size of datum being printed.
271 This is used to pad hex numbers so they line up. SIZE is 0
272 for print / output and set for examine. */
275 print_formatted (struct value
*val
, int size
,
276 const struct value_print_options
*options
,
277 struct ui_file
*stream
)
279 struct type
*type
= check_typedef (value_type (val
));
280 int len
= TYPE_LENGTH (type
);
282 if (VALUE_LVAL (val
) == lval_memory
)
283 next_address
= value_address (val
) + len
;
287 switch (options
->format
)
291 struct type
*elttype
= value_type (val
);
293 next_address
= (value_address (val
)
294 + val_print_string (elttype
, NULL
,
295 value_address (val
), -1,
296 stream
, options
) * len
);
301 /* We often wrap here if there are long symbolic names. */
303 next_address
= (value_address (val
)
304 + gdb_print_insn (get_type_arch (type
),
305 value_address (val
), stream
,
306 &branch_delay_insns
));
311 if (options
->format
== 0 || options
->format
== 's'
312 || TYPE_CODE (type
) == TYPE_CODE_REF
313 || TYPE_CODE (type
) == TYPE_CODE_ARRAY
314 || TYPE_CODE (type
) == TYPE_CODE_STRING
315 || TYPE_CODE (type
) == TYPE_CODE_STRUCT
316 || TYPE_CODE (type
) == TYPE_CODE_UNION
317 || TYPE_CODE (type
) == TYPE_CODE_NAMESPACE
)
318 value_print (val
, stream
, options
);
320 /* User specified format, so don't look to the type to tell us
322 val_print_scalar_formatted (type
,
323 value_embedded_offset (val
),
325 options
, size
, stream
);
328 /* Return builtin floating point type of same length as TYPE.
329 If no such type is found, return TYPE itself. */
331 float_type_from_length (struct type
*type
)
333 struct gdbarch
*gdbarch
= get_type_arch (type
);
334 const struct builtin_type
*builtin
= builtin_type (gdbarch
);
336 if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_float
))
337 type
= builtin
->builtin_float
;
338 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_double
))
339 type
= builtin
->builtin_double
;
340 else if (TYPE_LENGTH (type
) == TYPE_LENGTH (builtin
->builtin_long_double
))
341 type
= builtin
->builtin_long_double
;
346 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
347 according to OPTIONS and SIZE on STREAM. Formats s and i are not
348 supported at this level. */
351 print_scalar_formatted (const gdb_byte
*valaddr
, struct type
*type
,
352 const struct value_print_options
*options
,
353 int size
, struct ui_file
*stream
)
355 struct gdbarch
*gdbarch
= get_type_arch (type
);
356 unsigned int len
= TYPE_LENGTH (type
);
357 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
359 /* String printing should go through val_print_scalar_formatted. */
360 gdb_assert (options
->format
!= 's');
362 /* If the value is a pointer, and pointers and addresses are not the
363 same, then at this point, the value's length (in target bytes) is
364 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
365 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
366 len
= gdbarch_addr_bit (gdbarch
) / TARGET_CHAR_BIT
;
368 /* If we are printing it as unsigned, truncate it in case it is actually
369 a negative signed value (e.g. "print/u (short)-1" should print 65535
370 (if shorts are 16 bits) instead of 4294967295). */
371 if (options
->format
!= 'c'
372 && (options
->format
!= 'd' || TYPE_UNSIGNED (type
)))
374 if (len
< TYPE_LENGTH (type
) && byte_order
== BFD_ENDIAN_BIG
)
375 valaddr
+= TYPE_LENGTH (type
) - len
;
378 if (size
!= 0 && (options
->format
== 'x' || options
->format
== 't'))
380 /* Truncate to fit. */
397 error (_("Undefined output size \"%c\"."), size
);
399 if (newlen
< len
&& byte_order
== BFD_ENDIAN_BIG
)
400 valaddr
+= len
- newlen
;
404 /* Historically gdb has printed floats by first casting them to a
405 long, and then printing the long. PR cli/16242 suggests changing
406 this to using C-style hex float format. */
407 gdb::byte_vector converted_float_bytes
;
408 if (TYPE_CODE (type
) == TYPE_CODE_FLT
409 && (options
->format
== 'o'
410 || options
->format
== 'x'
411 || options
->format
== 't'
412 || options
->format
== 'z'
413 || options
->format
== 'd'
414 || options
->format
== 'u'))
416 LONGEST val_long
= unpack_long (type
, valaddr
);
417 converted_float_bytes
.resize (TYPE_LENGTH (type
));
418 store_signed_integer (converted_float_bytes
.data (), TYPE_LENGTH (type
),
419 byte_order
, val_long
);
420 valaddr
= converted_float_bytes
.data ();
423 /* Printing a non-float type as 'f' will interpret the data as if it were
424 of a floating-point type of the same length, if that exists. Otherwise,
425 the data is printed as integer. */
426 char format
= options
->format
;
427 if (format
== 'f' && TYPE_CODE (type
) != TYPE_CODE_FLT
)
429 type
= float_type_from_length (type
);
430 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
437 print_octal_chars (stream
, valaddr
, len
, byte_order
);
440 print_decimal_chars (stream
, valaddr
, len
, true, byte_order
);
443 print_decimal_chars (stream
, valaddr
, len
, false, byte_order
);
446 if (TYPE_CODE (type
) != TYPE_CODE_FLT
)
448 print_decimal_chars (stream
, valaddr
, len
, !TYPE_UNSIGNED (type
),
454 print_floating (valaddr
, type
, stream
);
458 print_binary_chars (stream
, valaddr
, len
, byte_order
, size
> 0);
461 print_hex_chars (stream
, valaddr
, len
, byte_order
, size
> 0);
464 print_hex_chars (stream
, valaddr
, len
, byte_order
, true);
468 struct value_print_options opts
= *options
;
470 LONGEST val_long
= unpack_long (type
, valaddr
);
473 if (TYPE_UNSIGNED (type
))
474 type
= builtin_type (gdbarch
)->builtin_true_unsigned_char
;
476 type
= builtin_type (gdbarch
)->builtin_true_char
;
478 value_print (value_from_longest (type
, val_long
), stream
, &opts
);
484 CORE_ADDR addr
= unpack_pointer (type
, valaddr
);
486 print_address (gdbarch
, addr
, stream
);
491 error (_("Undefined output format \"%c\"."), format
);
495 /* Specify default address for `x' command.
496 The `info lines' command uses this. */
499 set_next_address (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
501 struct type
*ptr_type
= builtin_type (gdbarch
)->builtin_data_ptr
;
503 next_gdbarch
= gdbarch
;
506 /* Make address available to the user as $_. */
507 set_internalvar (lookup_internalvar ("_"),
508 value_from_pointer (ptr_type
, addr
));
511 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
512 after LEADIN. Print nothing if no symbolic name is found nearby.
513 Optionally also print source file and line number, if available.
514 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
515 or to interpret it as a possible C++ name and convert it back to source
516 form. However note that DO_DEMANGLE can be overridden by the specific
517 settings of the demangle and asm_demangle variables. Returns
518 non-zero if anything was printed; zero otherwise. */
521 print_address_symbolic (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
522 struct ui_file
*stream
,
523 int do_demangle
, const char *leadin
)
526 char *filename
= NULL
;
531 /* Throw away both name and filename. */
532 struct cleanup
*cleanup_chain
= make_cleanup (free_current_contents
, &name
);
533 make_cleanup (free_current_contents
, &filename
);
535 if (build_address_symbolic (gdbarch
, addr
, do_demangle
, &name
, &offset
,
536 &filename
, &line
, &unmapped
))
538 do_cleanups (cleanup_chain
);
542 fputs_filtered (leadin
, stream
);
544 fputs_filtered ("<*", stream
);
546 fputs_filtered ("<", stream
);
547 fputs_filtered (name
, stream
);
549 fprintf_filtered (stream
, "+%u", (unsigned int) offset
);
551 /* Append source filename and line number if desired. Give specific
552 line # of this addr, if we have it; else line # of the nearest symbol. */
553 if (print_symbol_filename
&& filename
!= NULL
)
556 fprintf_filtered (stream
, " at %s:%d", filename
, line
);
558 fprintf_filtered (stream
, " in %s", filename
);
561 fputs_filtered ("*>", stream
);
563 fputs_filtered (">", stream
);
565 do_cleanups (cleanup_chain
);
569 /* Given an address ADDR return all the elements needed to print the
570 address in a symbolic form. NAME can be mangled or not depending
571 on DO_DEMANGLE (and also on the asm_demangle global variable,
572 manipulated via ''set print asm-demangle''). Return 0 in case of
573 success, when all the info in the OUT paramters is valid. Return 1
576 build_address_symbolic (struct gdbarch
*gdbarch
,
577 CORE_ADDR addr
, /* IN */
578 int do_demangle
, /* IN */
579 char **name
, /* OUT */
580 int *offset
, /* OUT */
581 char **filename
, /* OUT */
583 int *unmapped
) /* OUT */
585 struct bound_minimal_symbol msymbol
;
586 struct symbol
*symbol
;
587 CORE_ADDR name_location
= 0;
588 struct obj_section
*section
= NULL
;
589 const char *name_temp
= "";
591 /* Let's say it is mapped (not unmapped). */
594 /* Determine if the address is in an overlay, and whether it is
596 if (overlay_debugging
)
598 section
= find_pc_overlay (addr
);
599 if (pc_in_unmapped_range (addr
, section
))
602 addr
= overlay_mapped_address (addr
, section
);
606 /* First try to find the address in the symbol table, then
607 in the minsyms. Take the closest one. */
609 /* This is defective in the sense that it only finds text symbols. So
610 really this is kind of pointless--we should make sure that the
611 minimal symbols have everything we need (by changing that we could
612 save some memory, but for many debug format--ELF/DWARF or
613 anything/stabs--it would be inconvenient to eliminate those minimal
615 msymbol
= lookup_minimal_symbol_by_pc_section (addr
, section
);
616 symbol
= find_pc_sect_function (addr
, section
);
620 /* If this is a function (i.e. a code address), strip out any
621 non-address bits. For instance, display a pointer to the
622 first instruction of a Thumb function as <function>; the
623 second instruction will be <function+2>, even though the
624 pointer is <function+3>. This matches the ISA behavior. */
625 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
627 name_location
= BLOCK_START (SYMBOL_BLOCK_VALUE (symbol
));
628 if (do_demangle
|| asm_demangle
)
629 name_temp
= SYMBOL_PRINT_NAME (symbol
);
631 name_temp
= SYMBOL_LINKAGE_NAME (symbol
);
634 if (msymbol
.minsym
!= NULL
635 && MSYMBOL_HAS_SIZE (msymbol
.minsym
)
636 && MSYMBOL_SIZE (msymbol
.minsym
) == 0
637 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text
638 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_text_gnu_ifunc
639 && MSYMBOL_TYPE (msymbol
.minsym
) != mst_file_text
)
640 msymbol
.minsym
= NULL
;
642 if (msymbol
.minsym
!= NULL
)
644 if (BMSYMBOL_VALUE_ADDRESS (msymbol
) > name_location
|| symbol
== NULL
)
646 /* If this is a function (i.e. a code address), strip out any
647 non-address bits. For instance, display a pointer to the
648 first instruction of a Thumb function as <function>; the
649 second instruction will be <function+2>, even though the
650 pointer is <function+3>. This matches the ISA behavior. */
651 if (MSYMBOL_TYPE (msymbol
.minsym
) == mst_text
652 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_text_gnu_ifunc
653 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_file_text
654 || MSYMBOL_TYPE (msymbol
.minsym
) == mst_solib_trampoline
)
655 addr
= gdbarch_addr_bits_remove (gdbarch
, addr
);
657 /* The msymbol is closer to the address than the symbol;
658 use the msymbol instead. */
660 name_location
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
661 if (do_demangle
|| asm_demangle
)
662 name_temp
= MSYMBOL_PRINT_NAME (msymbol
.minsym
);
664 name_temp
= MSYMBOL_LINKAGE_NAME (msymbol
.minsym
);
667 if (symbol
== NULL
&& msymbol
.minsym
== NULL
)
670 /* If the nearest symbol is too far away, don't print anything symbolic. */
672 /* For when CORE_ADDR is larger than unsigned int, we do math in
673 CORE_ADDR. But when we detect unsigned wraparound in the
674 CORE_ADDR math, we ignore this test and print the offset,
675 because addr+max_symbolic_offset has wrapped through the end
676 of the address space back to the beginning, giving bogus comparison. */
677 if (addr
> name_location
+ max_symbolic_offset
678 && name_location
+ max_symbolic_offset
> name_location
)
681 *offset
= addr
- name_location
;
683 *name
= xstrdup (name_temp
);
685 if (print_symbol_filename
)
687 struct symtab_and_line sal
;
689 sal
= find_pc_sect_line (addr
, section
, 0);
693 *filename
= xstrdup (symtab_to_filename_for_display (sal
.symtab
));
701 /* Print address ADDR symbolically on STREAM.
702 First print it as a number. Then perhaps print
703 <SYMBOL + OFFSET> after the number. */
706 print_address (struct gdbarch
*gdbarch
,
707 CORE_ADDR addr
, struct ui_file
*stream
)
709 fputs_filtered (paddress (gdbarch
, addr
), stream
);
710 print_address_symbolic (gdbarch
, addr
, stream
, asm_demangle
, " ");
713 /* Return a prefix for instruction address:
714 "=> " for current instruction, else " ". */
717 pc_prefix (CORE_ADDR addr
)
719 if (has_stack_frames ())
721 struct frame_info
*frame
;
724 frame
= get_selected_frame (NULL
);
725 if (get_frame_pc_if_available (frame
, &pc
) && pc
== addr
)
731 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
732 controls whether to print the symbolic name "raw" or demangled.
733 Return non-zero if anything was printed; zero otherwise. */
736 print_address_demangle (const struct value_print_options
*opts
,
737 struct gdbarch
*gdbarch
, CORE_ADDR addr
,
738 struct ui_file
*stream
, int do_demangle
)
740 if (opts
->addressprint
)
742 fputs_filtered (paddress (gdbarch
, addr
), stream
);
743 print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, " ");
747 return print_address_symbolic (gdbarch
, addr
, stream
, do_demangle
, "");
753 /* Find the address of the instruction that is INST_COUNT instructions before
754 the instruction at ADDR.
755 Since some architectures have variable-length instructions, we can't just
756 simply subtract INST_COUNT * INSN_LEN from ADDR. Instead, we use line
757 number information to locate the nearest known instruction boundary,
758 and disassemble forward from there. If we go out of the symbol range
759 during disassembling, we return the lowest address we've got so far and
760 set the number of instructions read to INST_READ. */
763 find_instruction_backward (struct gdbarch
*gdbarch
, CORE_ADDR addr
,
764 int inst_count
, int *inst_read
)
766 /* The vector PCS is used to store instruction addresses within
768 CORE_ADDR loop_start
, loop_end
, p
;
769 std::vector
<CORE_ADDR
> pcs
;
770 struct symtab_and_line sal
;
773 loop_start
= loop_end
= addr
;
775 /* In each iteration of the outer loop, we get a pc range that ends before
776 LOOP_START, then we count and store every instruction address of the range
777 iterated in the loop.
778 If the number of instructions counted reaches INST_COUNT, return the
779 stored address that is located INST_COUNT instructions back from ADDR.
780 If INST_COUNT is not reached, we subtract the number of counted
781 instructions from INST_COUNT, and go to the next iteration. */
785 sal
= find_pc_sect_line (loop_start
, NULL
, 1);
788 /* We reach here when line info is not available. In this case,
789 we print a message and just exit the loop. The return value
790 is calculated after the loop. */
791 printf_filtered (_("No line number information available "
794 print_address (gdbarch
, loop_start
- 1, gdb_stdout
);
795 printf_filtered ("\n");
799 loop_end
= loop_start
;
802 /* This loop pushes instruction addresses in the range from
803 LOOP_START to LOOP_END. */
804 for (p
= loop_start
; p
< loop_end
;)
807 p
+= gdb_insn_length (gdbarch
, p
);
810 inst_count
-= pcs
.size ();
811 *inst_read
+= pcs
.size ();
813 while (inst_count
> 0);
815 /* After the loop, the vector PCS has instruction addresses of the last
816 source line we processed, and INST_COUNT has a negative value.
817 We return the address at the index of -INST_COUNT in the vector for
819 Let's assume the following instruction addresses and run 'x/-4i 0x400e'.
829 find_instruction_backward is called with INST_COUNT = 4 and expected to
830 return 0x4001. When we reach here, INST_COUNT is set to -1 because
831 it was subtracted by 2 (from Line Y) and 3 (from Line X). The value
832 4001 is located at the index 1 of the last iterated line (= Line X),
833 which is simply calculated by -INST_COUNT.
834 The case when the length of PCS is 0 means that we reached an area for
835 which line info is not available. In such case, we return LOOP_START,
836 which was the lowest instruction address that had line info. */
837 p
= pcs
.size () > 0 ? pcs
[-inst_count
] : loop_start
;
839 /* INST_READ includes all instruction addresses in a pc range. Need to
840 exclude the beginning part up to the address we're returning. That
841 is, exclude {0x4000} in the example above. */
843 *inst_read
+= inst_count
;
848 /* Backward read LEN bytes of target memory from address MEMADDR + LEN,
849 placing the results in GDB's memory from MYADDR + LEN. Returns
850 a count of the bytes actually read. */
853 read_memory_backward (struct gdbarch
*gdbarch
,
854 CORE_ADDR memaddr
, gdb_byte
*myaddr
, int len
)
857 int nread
; /* Number of bytes actually read. */
859 /* First try a complete read. */
860 errcode
= target_read_memory (memaddr
, myaddr
, len
);
868 /* Loop, reading one byte at a time until we get as much as we can. */
871 for (nread
= 0; nread
< len
; ++nread
)
873 errcode
= target_read_memory (--memaddr
, --myaddr
, 1);
876 /* The read was unsuccessful, so exit the loop. */
877 printf_filtered (_("Cannot access memory at address %s\n"),
878 paddress (gdbarch
, memaddr
));
886 /* Returns true if X (which is LEN bytes wide) is the number zero. */
889 integer_is_zero (const gdb_byte
*x
, int len
)
893 while (i
< len
&& x
[i
] == 0)
898 /* Find the start address of a string in which ADDR is included.
899 Basically we search for '\0' and return the next address,
900 but if OPTIONS->PRINT_MAX is smaller than the length of a string,
901 we stop searching and return the address to print characters as many as
902 PRINT_MAX from the string. */
905 find_string_backward (struct gdbarch
*gdbarch
,
906 CORE_ADDR addr
, int count
, int char_size
,
907 const struct value_print_options
*options
,
908 int *strings_counted
)
910 const int chunk_size
= 0x20;
913 int chars_to_read
= chunk_size
;
914 int chars_counted
= 0;
915 int count_original
= count
;
916 CORE_ADDR string_start_addr
= addr
;
918 gdb_assert (char_size
== 1 || char_size
== 2 || char_size
== 4);
919 gdb::byte_vector
buffer (chars_to_read
* char_size
);
920 while (count
> 0 && read_error
== 0)
924 addr
-= chars_to_read
* char_size
;
925 chars_read
= read_memory_backward (gdbarch
, addr
, buffer
.data (),
926 chars_to_read
* char_size
);
927 chars_read
/= char_size
;
928 read_error
= (chars_read
== chars_to_read
) ? 0 : 1;
929 /* Searching for '\0' from the end of buffer in backward direction. */
930 for (i
= 0; i
< chars_read
&& count
> 0 ; ++i
, ++chars_counted
)
932 int offset
= (chars_to_read
- i
- 1) * char_size
;
934 if (integer_is_zero (&buffer
[offset
], char_size
)
935 || chars_counted
== options
->print_max
)
937 /* Found '\0' or reached print_max. As OFFSET is the offset to
938 '\0', we add CHAR_SIZE to return the start address of
941 string_start_addr
= addr
+ offset
+ char_size
;
947 /* Update STRINGS_COUNTED with the actual number of loaded strings. */
948 *strings_counted
= count_original
- count
;
952 /* In error case, STRING_START_ADDR is pointing to the string that
953 was last successfully loaded. Rewind the partially loaded string. */
954 string_start_addr
-= chars_counted
* char_size
;
957 return string_start_addr
;
960 /* Examine data at address ADDR in format FMT.
961 Fetch it from memory and print on gdb_stdout. */
964 do_examine (struct format_data fmt
, struct gdbarch
*gdbarch
, CORE_ADDR addr
)
969 struct type
*val_type
= NULL
;
972 struct value_print_options opts
;
973 int need_to_update_next_address
= 0;
974 CORE_ADDR addr_rewound
= 0;
979 next_gdbarch
= gdbarch
;
982 /* Instruction format implies fetch single bytes
983 regardless of the specified size.
984 The case of strings is handled in decode_format, only explicit
985 size operator are not changed to 'b'. */
991 /* Pick the appropriate size for an address. */
992 if (gdbarch_ptr_bit (next_gdbarch
) == 64)
994 else if (gdbarch_ptr_bit (next_gdbarch
) == 32)
996 else if (gdbarch_ptr_bit (next_gdbarch
) == 16)
999 /* Bad value for gdbarch_ptr_bit. */
1000 internal_error (__FILE__
, __LINE__
,
1001 _("failed internal consistency check"));
1005 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
1006 else if (size
== 'h')
1007 val_type
= builtin_type (next_gdbarch
)->builtin_int16
;
1008 else if (size
== 'w')
1009 val_type
= builtin_type (next_gdbarch
)->builtin_int32
;
1010 else if (size
== 'g')
1011 val_type
= builtin_type (next_gdbarch
)->builtin_int64
;
1015 struct type
*char_type
= NULL
;
1017 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
1018 if type is not found. */
1020 char_type
= builtin_type (next_gdbarch
)->builtin_char16
;
1021 else if (size
== 'w')
1022 char_type
= builtin_type (next_gdbarch
)->builtin_char32
;
1024 val_type
= char_type
;
1027 if (size
!= '\0' && size
!= 'b')
1028 warning (_("Unable to display strings with "
1029 "size '%c', using 'b' instead."), size
);
1031 val_type
= builtin_type (next_gdbarch
)->builtin_int8
;
1040 if (format
== 's' || format
== 'i')
1043 get_formatted_print_options (&opts
, format
);
1047 /* This is the negative repeat count case.
1048 We rewind the address based on the given repeat count and format,
1049 then examine memory from there in forward direction. */
1054 next_address
= find_instruction_backward (gdbarch
, addr
, count
,
1057 else if (format
== 's')
1059 next_address
= find_string_backward (gdbarch
, addr
, count
,
1060 TYPE_LENGTH (val_type
),
1065 next_address
= addr
- count
* TYPE_LENGTH (val_type
);
1068 /* The following call to print_formatted updates next_address in every
1069 iteration. In backward case, we store the start address here
1070 and update next_address with it before exiting the function. */
1071 addr_rewound
= (format
== 's'
1072 ? next_address
- TYPE_LENGTH (val_type
)
1074 need_to_update_next_address
= 1;
1077 /* Print as many objects as specified in COUNT, at most maxelts per line,
1078 with the address of the next one at the start of each line. */
1084 fputs_filtered (pc_prefix (next_address
), gdb_stdout
);
1085 print_address (next_gdbarch
, next_address
, gdb_stdout
);
1086 printf_filtered (":");
1091 printf_filtered ("\t");
1092 /* Note that print_formatted sets next_address for the next
1094 last_examine_address
= next_address
;
1096 /* The value to be displayed is not fetched greedily.
1097 Instead, to avoid the possibility of a fetched value not
1098 being used, its retrieval is delayed until the print code
1099 uses it. When examining an instruction stream, the
1100 disassembler will perform its own memory fetch using just
1101 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
1102 the disassembler be modified so that LAST_EXAMINE_VALUE
1103 is left with the byte sequence from the last complete
1104 instruction fetched from memory? */
1106 = release_value (value_at_lazy (val_type
, next_address
));
1108 print_formatted (last_examine_value
.get (), size
, &opts
, gdb_stdout
);
1110 /* Display any branch delay slots following the final insn. */
1111 if (format
== 'i' && count
== 1)
1112 count
+= branch_delay_insns
;
1114 printf_filtered ("\n");
1115 gdb_flush (gdb_stdout
);
1118 if (need_to_update_next_address
)
1119 next_address
= addr_rewound
;
1123 validate_format (struct format_data fmt
, const char *cmdname
)
1126 error (_("Size letters are meaningless in \"%s\" command."), cmdname
);
1128 error (_("Item count other than 1 is meaningless in \"%s\" command."),
1130 if (fmt
.format
== 'i')
1131 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
1132 fmt
.format
, cmdname
);
1135 /* Parse print command format string into *FMTP and update *EXPP.
1136 CMDNAME should name the current command. */
1139 print_command_parse_format (const char **expp
, const char *cmdname
,
1140 struct format_data
*fmtp
)
1142 const char *exp
= *expp
;
1144 if (exp
&& *exp
== '/')
1147 *fmtp
= decode_format (&exp
, last_format
, 0);
1148 validate_format (*fmtp
, cmdname
);
1149 last_format
= fmtp
->format
;
1162 /* Print VAL to console according to *FMTP, including recording it to
1166 print_value (struct value
*val
, const struct format_data
*fmtp
)
1168 struct value_print_options opts
;
1169 int histindex
= record_latest_value (val
);
1171 annotate_value_history_begin (histindex
, value_type (val
));
1173 printf_filtered ("$%d = ", histindex
);
1175 annotate_value_history_value ();
1177 get_formatted_print_options (&opts
, fmtp
->format
);
1178 opts
.raw
= fmtp
->raw
;
1180 print_formatted (val
, fmtp
->size
, &opts
, gdb_stdout
);
1181 printf_filtered ("\n");
1183 annotate_value_history_end ();
1186 /* Evaluate string EXP as an expression in the current language and
1187 print the resulting value. EXP may contain a format specifier as the
1188 first argument ("/x myvar" for example, to print myvar in hex). */
1191 print_command_1 (const char *exp
, int voidprint
)
1194 struct format_data fmt
;
1196 print_command_parse_format (&exp
, "print", &fmt
);
1200 expression_up expr
= parse_expression (exp
);
1201 val
= evaluate_expression (expr
.get ());
1204 val
= access_value_history (0);
1206 if (voidprint
|| (val
&& value_type (val
) &&
1207 TYPE_CODE (value_type (val
)) != TYPE_CODE_VOID
))
1208 print_value (val
, &fmt
);
1212 print_command (const char *exp
, int from_tty
)
1214 print_command_1 (exp
, 1);
1217 /* Same as print, except it doesn't print void results. */
1219 call_command (const char *exp
, int from_tty
)
1221 print_command_1 (exp
, 0);
1224 /* Implementation of the "output" command. */
1227 output_command (const char *exp
, int from_tty
)
1229 output_command_const (exp
, from_tty
);
1232 /* Like output_command, but takes a const string as argument. */
1235 output_command_const (const char *exp
, int from_tty
)
1239 struct format_data fmt
;
1240 struct value_print_options opts
;
1245 if (exp
&& *exp
== '/')
1248 fmt
= decode_format (&exp
, 0, 0);
1249 validate_format (fmt
, "output");
1250 format
= fmt
.format
;
1253 expression_up expr
= parse_expression (exp
);
1255 val
= evaluate_expression (expr
.get ());
1257 annotate_value_begin (value_type (val
));
1259 get_formatted_print_options (&opts
, format
);
1261 print_formatted (val
, fmt
.size
, &opts
, gdb_stdout
);
1263 annotate_value_end ();
1266 gdb_flush (gdb_stdout
);
1270 set_command (const char *exp
, int from_tty
)
1272 expression_up expr
= parse_expression (exp
);
1274 if (expr
->nelts
>= 1)
1275 switch (expr
->elts
[0].opcode
)
1277 case UNOP_PREINCREMENT
:
1278 case UNOP_POSTINCREMENT
:
1279 case UNOP_PREDECREMENT
:
1280 case UNOP_POSTDECREMENT
:
1282 case BINOP_ASSIGN_MODIFY
:
1287 (_("Expression is not an assignment (and might have no effect)"));
1290 evaluate_expression (expr
.get ());
1294 info_symbol_command (const char *arg
, int from_tty
)
1296 struct minimal_symbol
*msymbol
;
1297 struct objfile
*objfile
;
1298 struct obj_section
*osect
;
1299 CORE_ADDR addr
, sect_addr
;
1301 unsigned int offset
;
1304 error_no_arg (_("address"));
1306 addr
= parse_and_eval_address (arg
);
1307 ALL_OBJSECTIONS (objfile
, osect
)
1309 /* Only process each object file once, even if there's a separate
1311 if (objfile
->separate_debug_objfile_backlink
)
1314 sect_addr
= overlay_mapped_address (addr
, osect
);
1316 if (obj_section_addr (osect
) <= sect_addr
1317 && sect_addr
< obj_section_endaddr (osect
)
1319 = lookup_minimal_symbol_by_pc_section (sect_addr
, osect
).minsym
))
1321 const char *obj_name
, *mapped
, *sec_name
, *msym_name
;
1322 const char *loc_string
;
1323 struct cleanup
*old_chain
;
1326 offset
= sect_addr
- MSYMBOL_VALUE_ADDRESS (objfile
, msymbol
);
1327 mapped
= section_is_mapped (osect
) ? _("mapped") : _("unmapped");
1328 sec_name
= osect
->the_bfd_section
->name
;
1329 msym_name
= MSYMBOL_PRINT_NAME (msymbol
);
1331 /* Don't print the offset if it is zero.
1332 We assume there's no need to handle i18n of "sym + offset". */
1333 std::string string_holder
;
1336 string_holder
= string_printf ("%s + %u", msym_name
, offset
);
1337 loc_string
= string_holder
.c_str ();
1340 loc_string
= msym_name
;
1342 gdb_assert (osect
->objfile
&& objfile_name (osect
->objfile
));
1343 obj_name
= objfile_name (osect
->objfile
);
1345 if (MULTI_OBJFILE_P ())
1346 if (pc_in_unmapped_range (addr
, osect
))
1347 if (section_is_overlay (osect
))
1348 printf_filtered (_("%s in load address range of "
1349 "%s overlay section %s of %s\n"),
1350 loc_string
, mapped
, sec_name
, obj_name
);
1352 printf_filtered (_("%s in load address range of "
1353 "section %s of %s\n"),
1354 loc_string
, sec_name
, obj_name
);
1356 if (section_is_overlay (osect
))
1357 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1358 loc_string
, mapped
, sec_name
, obj_name
);
1360 printf_filtered (_("%s in section %s of %s\n"),
1361 loc_string
, sec_name
, obj_name
);
1363 if (pc_in_unmapped_range (addr
, osect
))
1364 if (section_is_overlay (osect
))
1365 printf_filtered (_("%s in load address range of %s overlay "
1367 loc_string
, mapped
, sec_name
);
1369 printf_filtered (_("%s in load address range of section %s\n"),
1370 loc_string
, sec_name
);
1372 if (section_is_overlay (osect
))
1373 printf_filtered (_("%s in %s overlay section %s\n"),
1374 loc_string
, mapped
, sec_name
);
1376 printf_filtered (_("%s in section %s\n"),
1377 loc_string
, sec_name
);
1381 printf_filtered (_("No symbol matches %s.\n"), arg
);
1385 info_address_command (const char *exp
, int from_tty
)
1387 struct gdbarch
*gdbarch
;
1390 struct bound_minimal_symbol msymbol
;
1392 struct obj_section
*section
;
1393 CORE_ADDR load_addr
, context_pc
= 0;
1394 struct field_of_this_result is_a_field_of_this
;
1397 error (_("Argument required."));
1399 sym
= lookup_symbol (exp
, get_selected_block (&context_pc
), VAR_DOMAIN
,
1400 &is_a_field_of_this
).symbol
;
1403 if (is_a_field_of_this
.type
!= NULL
)
1405 printf_filtered ("Symbol \"");
1406 fprintf_symbol_filtered (gdb_stdout
, exp
,
1407 current_language
->la_language
, DMGL_ANSI
);
1408 printf_filtered ("\" is a field of the local class variable ");
1409 if (current_language
->la_language
== language_objc
)
1410 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1412 printf_filtered ("`this'\n");
1416 msymbol
= lookup_bound_minimal_symbol (exp
);
1418 if (msymbol
.minsym
!= NULL
)
1420 struct objfile
*objfile
= msymbol
.objfile
;
1422 gdbarch
= get_objfile_arch (objfile
);
1423 load_addr
= BMSYMBOL_VALUE_ADDRESS (msymbol
);
1425 printf_filtered ("Symbol \"");
1426 fprintf_symbol_filtered (gdb_stdout
, exp
,
1427 current_language
->la_language
, DMGL_ANSI
);
1428 printf_filtered ("\" is at ");
1429 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1430 printf_filtered (" in a file compiled without debugging");
1431 section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
.minsym
);
1432 if (section_is_overlay (section
))
1434 load_addr
= overlay_unmapped_address (load_addr
, section
);
1435 printf_filtered (",\n -- loaded at ");
1436 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1437 printf_filtered (" in overlay section %s",
1438 section
->the_bfd_section
->name
);
1440 printf_filtered (".\n");
1443 error (_("No symbol \"%s\" in current context."), exp
);
1447 printf_filtered ("Symbol \"");
1448 fprintf_symbol_filtered (gdb_stdout
, SYMBOL_PRINT_NAME (sym
),
1449 current_language
->la_language
, DMGL_ANSI
);
1450 printf_filtered ("\" is ");
1451 val
= SYMBOL_VALUE (sym
);
1452 if (SYMBOL_OBJFILE_OWNED (sym
))
1453 section
= SYMBOL_OBJ_SECTION (symbol_objfile (sym
), sym
);
1456 gdbarch
= symbol_arch (sym
);
1458 if (SYMBOL_COMPUTED_OPS (sym
) != NULL
)
1460 SYMBOL_COMPUTED_OPS (sym
)->describe_location (sym
, context_pc
,
1462 printf_filtered (".\n");
1466 switch (SYMBOL_CLASS (sym
))
1469 case LOC_CONST_BYTES
:
1470 printf_filtered ("constant");
1474 printf_filtered ("a label at address ");
1475 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1476 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1477 if (section_is_overlay (section
))
1479 load_addr
= overlay_unmapped_address (load_addr
, section
);
1480 printf_filtered (",\n -- loaded at ");
1481 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1482 printf_filtered (" in overlay section %s",
1483 section
->the_bfd_section
->name
);
1488 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1491 /* GDBARCH is the architecture associated with the objfile the symbol
1492 is defined in; the target architecture may be different, and may
1493 provide additional registers. However, we do not know the target
1494 architecture at this point. We assume the objfile architecture
1495 will contain all the standard registers that occur in debug info
1497 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1499 if (SYMBOL_IS_ARGUMENT (sym
))
1500 printf_filtered (_("an argument in register %s"),
1501 gdbarch_register_name (gdbarch
, regno
));
1503 printf_filtered (_("a variable in register %s"),
1504 gdbarch_register_name (gdbarch
, regno
));
1508 printf_filtered (_("static storage at address "));
1509 load_addr
= SYMBOL_VALUE_ADDRESS (sym
);
1510 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1511 if (section_is_overlay (section
))
1513 load_addr
= overlay_unmapped_address (load_addr
, section
);
1514 printf_filtered (_(",\n -- loaded at "));
1515 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1516 printf_filtered (_(" in overlay section %s"),
1517 section
->the_bfd_section
->name
);
1521 case LOC_REGPARM_ADDR
:
1522 /* Note comment at LOC_REGISTER. */
1523 regno
= SYMBOL_REGISTER_OPS (sym
)->register_number (sym
, gdbarch
);
1524 printf_filtered (_("address of an argument in register %s"),
1525 gdbarch_register_name (gdbarch
, regno
));
1529 printf_filtered (_("an argument at offset %ld"), val
);
1533 printf_filtered (_("a local variable at frame offset %ld"), val
);
1537 printf_filtered (_("a reference argument at offset %ld"), val
);
1541 printf_filtered (_("a typedef"));
1545 printf_filtered (_("a function at address "));
1546 load_addr
= BLOCK_START (SYMBOL_BLOCK_VALUE (sym
));
1547 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1548 if (section_is_overlay (section
))
1550 load_addr
= overlay_unmapped_address (load_addr
, section
);
1551 printf_filtered (_(",\n -- loaded at "));
1552 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1553 printf_filtered (_(" in overlay section %s"),
1554 section
->the_bfd_section
->name
);
1558 case LOC_UNRESOLVED
:
1560 struct bound_minimal_symbol msym
;
1562 msym
= lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym
));
1563 if (msym
.minsym
== NULL
)
1564 printf_filtered ("unresolved");
1567 section
= MSYMBOL_OBJ_SECTION (msym
.objfile
, msym
.minsym
);
1570 && (section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
) != 0)
1572 load_addr
= MSYMBOL_VALUE_RAW_ADDRESS (msym
.minsym
);
1573 printf_filtered (_("a thread-local variable at offset %s "
1574 "in the thread-local storage for `%s'"),
1575 paddress (gdbarch
, load_addr
),
1576 objfile_name (section
->objfile
));
1580 load_addr
= BMSYMBOL_VALUE_ADDRESS (msym
);
1581 printf_filtered (_("static storage at address "));
1582 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1583 if (section_is_overlay (section
))
1585 load_addr
= overlay_unmapped_address (load_addr
, section
);
1586 printf_filtered (_(",\n -- loaded at "));
1587 fputs_filtered (paddress (gdbarch
, load_addr
), gdb_stdout
);
1588 printf_filtered (_(" in overlay section %s"),
1589 section
->the_bfd_section
->name
);
1596 case LOC_OPTIMIZED_OUT
:
1597 printf_filtered (_("optimized out"));
1601 printf_filtered (_("of unknown (botched) type"));
1604 printf_filtered (".\n");
1609 x_command (const char *exp
, int from_tty
)
1611 struct format_data fmt
;
1614 fmt
.format
= last_format
? last_format
: 'x';
1615 fmt
.size
= last_size
;
1619 if (exp
&& *exp
== '/')
1621 const char *tmp
= exp
+ 1;
1623 fmt
= decode_format (&tmp
, last_format
, last_size
);
1627 /* If we have an expression, evaluate it and use it as the address. */
1629 if (exp
!= 0 && *exp
!= 0)
1631 expression_up expr
= parse_expression (exp
);
1632 /* Cause expression not to be there any more if this command is
1633 repeated with Newline. But don't clobber a user-defined
1634 command's definition. */
1636 set_repeat_arguments ("");
1637 val
= evaluate_expression (expr
.get ());
1638 if (TYPE_IS_REFERENCE (value_type (val
)))
1639 val
= coerce_ref (val
);
1640 /* In rvalue contexts, such as this, functions are coerced into
1641 pointers to functions. This makes "x/i main" work. */
1642 if (/* last_format == 'i' && */
1643 TYPE_CODE (value_type (val
)) == TYPE_CODE_FUNC
1644 && VALUE_LVAL (val
) == lval_memory
)
1645 next_address
= value_address (val
);
1647 next_address
= value_as_address (val
);
1649 next_gdbarch
= expr
->gdbarch
;
1653 error_no_arg (_("starting display address"));
1655 do_examine (fmt
, next_gdbarch
, next_address
);
1657 /* If the examine succeeds, we remember its size and format for next
1658 time. Set last_size to 'b' for strings. */
1659 if (fmt
.format
== 's')
1662 last_size
= fmt
.size
;
1663 last_format
= fmt
.format
;
1665 /* Set a couple of internal variables if appropriate. */
1666 if (last_examine_value
!= nullptr)
1668 /* Make last address examined available to the user as $_. Use
1669 the correct pointer type. */
1670 struct type
*pointer_type
1671 = lookup_pointer_type (value_type (last_examine_value
.get ()));
1672 set_internalvar (lookup_internalvar ("_"),
1673 value_from_pointer (pointer_type
,
1674 last_examine_address
));
1676 /* Make contents of last address examined available to the user
1677 as $__. If the last value has not been fetched from memory
1678 then don't fetch it now; instead mark it by voiding the $__
1680 if (value_lazy (last_examine_value
.get ()))
1681 clear_internalvar (lookup_internalvar ("__"));
1683 set_internalvar (lookup_internalvar ("__"), last_examine_value
.get ());
1688 /* Add an expression to the auto-display chain.
1689 Specify the expression. */
1692 display_command (const char *arg
, int from_tty
)
1694 struct format_data fmt
;
1695 struct display
*newobj
;
1696 const char *exp
= arg
;
1707 fmt
= decode_format (&exp
, 0, 0);
1708 if (fmt
.size
&& fmt
.format
== 0)
1710 if (fmt
.format
== 'i' || fmt
.format
== 's')
1721 innermost_block
.reset ();
1722 expression_up expr
= parse_expression (exp
);
1724 newobj
= new display ();
1726 newobj
->exp_string
= xstrdup (exp
);
1727 newobj
->exp
= std::move (expr
);
1728 newobj
->block
= innermost_block
.block ();
1729 newobj
->pspace
= current_program_space
;
1730 newobj
->number
= ++display_number
;
1731 newobj
->format
= fmt
;
1732 newobj
->enabled_p
= 1;
1733 newobj
->next
= NULL
;
1735 if (display_chain
== NULL
)
1736 display_chain
= newobj
;
1739 struct display
*last
;
1741 for (last
= display_chain
; last
->next
!= NULL
; last
= last
->next
)
1743 last
->next
= newobj
;
1747 do_one_display (newobj
);
1753 free_display (struct display
*d
)
1755 xfree (d
->exp_string
);
1759 /* Clear out the display_chain. Done when new symtabs are loaded,
1760 since this invalidates the types stored in many expressions. */
1763 clear_displays (void)
1767 while ((d
= display_chain
) != NULL
)
1769 display_chain
= d
->next
;
1774 /* Delete the auto-display DISPLAY. */
1777 delete_display (struct display
*display
)
1781 gdb_assert (display
!= NULL
);
1783 if (display_chain
== display
)
1784 display_chain
= display
->next
;
1787 if (d
->next
== display
)
1789 d
->next
= display
->next
;
1793 free_display (display
);
1796 /* Call FUNCTION on each of the displays whose numbers are given in
1797 ARGS. DATA is passed unmodified to FUNCTION. */
1800 map_display_numbers (const char *args
,
1801 void (*function
) (struct display
*,
1808 error_no_arg (_("one or more display numbers"));
1810 number_or_range_parser
parser (args
);
1812 while (!parser
.finished ())
1814 const char *p
= parser
.cur_tok ();
1816 num
= parser
.get_number ();
1818 warning (_("bad display number at or near '%s'"), p
);
1821 struct display
*d
, *tmp
;
1823 ALL_DISPLAYS_SAFE (d
, tmp
)
1824 if (d
->number
== num
)
1827 printf_unfiltered (_("No display number %d.\n"), num
);
1834 /* Callback for map_display_numbers, that deletes a display. */
1837 do_delete_display (struct display
*d
, void *data
)
1842 /* "undisplay" command. */
1845 undisplay_command (const char *args
, int from_tty
)
1849 if (query (_("Delete all auto-display expressions? ")))
1855 map_display_numbers (args
, do_delete_display
, NULL
);
1859 /* Display a single auto-display.
1860 Do nothing if the display cannot be printed in the current context,
1861 or if the display is disabled. */
1864 do_one_display (struct display
*d
)
1866 int within_current_scope
;
1868 if (d
->enabled_p
== 0)
1871 /* The expression carries the architecture that was used at parse time.
1872 This is a problem if the expression depends on architecture features
1873 (e.g. register numbers), and the current architecture is now different.
1874 For example, a display statement like "display/i $pc" is expected to
1875 display the PC register of the current architecture, not the arch at
1876 the time the display command was given. Therefore, we re-parse the
1877 expression if the current architecture has changed. */
1878 if (d
->exp
!= NULL
&& d
->exp
->gdbarch
!= get_current_arch ())
1889 innermost_block
.reset ();
1890 d
->exp
= parse_expression (d
->exp_string
);
1891 d
->block
= innermost_block
.block ();
1893 CATCH (ex
, RETURN_MASK_ALL
)
1895 /* Can't re-parse the expression. Disable this display item. */
1897 warning (_("Unable to display \"%s\": %s"),
1898 d
->exp_string
, ex
.message
);
1906 if (d
->pspace
== current_program_space
)
1907 within_current_scope
= contained_in (get_selected_block (0), d
->block
);
1909 within_current_scope
= 0;
1912 within_current_scope
= 1;
1913 if (!within_current_scope
)
1916 scoped_restore save_display_number
1917 = make_scoped_restore (¤t_display_number
, d
->number
);
1919 annotate_display_begin ();
1920 printf_filtered ("%d", d
->number
);
1921 annotate_display_number_end ();
1922 printf_filtered (": ");
1926 annotate_display_format ();
1928 printf_filtered ("x/");
1929 if (d
->format
.count
!= 1)
1930 printf_filtered ("%d", d
->format
.count
);
1931 printf_filtered ("%c", d
->format
.format
);
1932 if (d
->format
.format
!= 'i' && d
->format
.format
!= 's')
1933 printf_filtered ("%c", d
->format
.size
);
1934 printf_filtered (" ");
1936 annotate_display_expression ();
1938 puts_filtered (d
->exp_string
);
1939 annotate_display_expression_end ();
1941 if (d
->format
.count
!= 1 || d
->format
.format
== 'i')
1942 printf_filtered ("\n");
1944 printf_filtered (" ");
1946 annotate_display_value ();
1953 val
= evaluate_expression (d
->exp
.get ());
1954 addr
= value_as_address (val
);
1955 if (d
->format
.format
== 'i')
1956 addr
= gdbarch_addr_bits_remove (d
->exp
->gdbarch
, addr
);
1957 do_examine (d
->format
, d
->exp
->gdbarch
, addr
);
1959 CATCH (ex
, RETURN_MASK_ERROR
)
1961 fprintf_filtered (gdb_stdout
, _("<error: %s>\n"), ex
.message
);
1967 struct value_print_options opts
;
1969 annotate_display_format ();
1971 if (d
->format
.format
)
1972 printf_filtered ("/%c ", d
->format
.format
);
1974 annotate_display_expression ();
1976 puts_filtered (d
->exp_string
);
1977 annotate_display_expression_end ();
1979 printf_filtered (" = ");
1981 annotate_display_expression ();
1983 get_formatted_print_options (&opts
, d
->format
.format
);
1984 opts
.raw
= d
->format
.raw
;
1990 val
= evaluate_expression (d
->exp
.get ());
1991 print_formatted (val
, d
->format
.size
, &opts
, gdb_stdout
);
1993 CATCH (ex
, RETURN_MASK_ERROR
)
1995 fprintf_filtered (gdb_stdout
, _("<error: %s>"), ex
.message
);
1999 printf_filtered ("\n");
2002 annotate_display_end ();
2004 gdb_flush (gdb_stdout
);
2007 /* Display all of the values on the auto-display chain which can be
2008 evaluated in the current scope. */
2015 for (d
= display_chain
; d
; d
= d
->next
)
2019 /* Delete the auto-display which we were in the process of displaying.
2020 This is done when there is an error or a signal. */
2023 disable_display (int num
)
2027 for (d
= display_chain
; d
; d
= d
->next
)
2028 if (d
->number
== num
)
2033 printf_unfiltered (_("No display number %d.\n"), num
);
2037 disable_current_display (void)
2039 if (current_display_number
>= 0)
2041 disable_display (current_display_number
);
2042 fprintf_unfiltered (gdb_stderr
,
2043 _("Disabling display %d to "
2044 "avoid infinite recursion.\n"),
2045 current_display_number
);
2047 current_display_number
= -1;
2051 info_display_command (const char *ignore
, int from_tty
)
2056 printf_unfiltered (_("There are no auto-display expressions now.\n"));
2058 printf_filtered (_("Auto-display expressions now in effect:\n\
2059 Num Enb Expression\n"));
2061 for (d
= display_chain
; d
; d
= d
->next
)
2063 printf_filtered ("%d: %c ", d
->number
, "ny"[(int) d
->enabled_p
]);
2065 printf_filtered ("/%d%c%c ", d
->format
.count
, d
->format
.size
,
2067 else if (d
->format
.format
)
2068 printf_filtered ("/%c ", d
->format
.format
);
2069 puts_filtered (d
->exp_string
);
2070 if (d
->block
&& !contained_in (get_selected_block (0), d
->block
))
2071 printf_filtered (_(" (cannot be evaluated in the current context)"));
2072 printf_filtered ("\n");
2073 gdb_flush (gdb_stdout
);
2077 /* Callback fo map_display_numbers, that enables or disables the
2078 passed in display D. */
2081 do_enable_disable_display (struct display
*d
, void *data
)
2083 d
->enabled_p
= *(int *) data
;
2086 /* Implamentation of both the "disable display" and "enable display"
2087 commands. ENABLE decides what to do. */
2090 enable_disable_display_command (const char *args
, int from_tty
, int enable
)
2097 d
->enabled_p
= enable
;
2101 map_display_numbers (args
, do_enable_disable_display
, &enable
);
2104 /* The "enable display" command. */
2107 enable_display_command (const char *args
, int from_tty
)
2109 enable_disable_display_command (args
, from_tty
, 1);
2112 /* The "disable display" command. */
2115 disable_display_command (const char *args
, int from_tty
)
2117 enable_disable_display_command (args
, from_tty
, 0);
2120 /* display_chain items point to blocks and expressions. Some expressions in
2121 turn may point to symbols.
2122 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
2123 obstack_free'd when a shared library is unloaded.
2124 Clear pointers that are about to become dangling.
2125 Both .exp and .block fields will be restored next time we need to display
2126 an item by re-parsing .exp_string field in the new execution context. */
2129 clear_dangling_display_expressions (struct objfile
*objfile
)
2132 struct program_space
*pspace
;
2134 /* With no symbol file we cannot have a block or expression from it. */
2135 if (objfile
== NULL
)
2137 pspace
= objfile
->pspace
;
2138 if (objfile
->separate_debug_objfile_backlink
)
2140 objfile
= objfile
->separate_debug_objfile_backlink
;
2141 gdb_assert (objfile
->pspace
== pspace
);
2144 for (d
= display_chain
; d
!= NULL
; d
= d
->next
)
2146 if (d
->pspace
!= pspace
)
2149 if (lookup_objfile_from_block (d
->block
) == objfile
2150 || (d
->exp
!= NULL
&& exp_uses_objfile (d
->exp
.get (), objfile
)))
2159 /* Print the value in stack frame FRAME of a variable specified by a
2160 struct symbol. NAME is the name to print; if NULL then VAR's print
2161 name will be used. STREAM is the ui_file on which to print the
2162 value. INDENT specifies the number of indent levels to print
2163 before printing the variable name.
2165 This function invalidates FRAME. */
2168 print_variable_and_value (const char *name
, struct symbol
*var
,
2169 struct frame_info
*frame
,
2170 struct ui_file
*stream
, int indent
)
2174 name
= SYMBOL_PRINT_NAME (var
);
2176 fprintf_filtered (stream
, "%s%s = ", n_spaces (2 * indent
), name
);
2180 struct value_print_options opts
;
2182 /* READ_VAR_VALUE needs a block in order to deal with non-local
2183 references (i.e. to handle nested functions). In this context, we
2184 print variables that are local to this frame, so we can avoid passing
2186 val
= read_var_value (var
, NULL
, frame
);
2187 get_user_print_options (&opts
);
2189 common_val_print (val
, stream
, indent
, &opts
, current_language
);
2191 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2195 CATCH (except
, RETURN_MASK_ERROR
)
2197 fprintf_filtered(stream
, "<error reading variable %s (%s)>", name
,
2202 fprintf_filtered (stream
, "\n");
2205 /* Subroutine of ui_printf to simplify it.
2206 Print VALUE to STREAM using FORMAT.
2207 VALUE is a C-style string on the target. */
2210 printf_c_string (struct ui_file
*stream
, const char *format
,
2211 struct value
*value
)
2217 tem
= value_as_address (value
);
2220 fprintf_filtered (stream
, format
, "(null)");
2224 /* This is a %s argument. Find the length of the string. */
2230 read_memory (tem
+ j
, &c
, 1);
2235 /* Copy the string contents into a string inside GDB. */
2236 str
= (gdb_byte
*) alloca (j
+ 1);
2238 read_memory (tem
, str
, j
);
2241 fprintf_filtered (stream
, format
, (char *) str
);
2244 /* Subroutine of ui_printf to simplify it.
2245 Print VALUE to STREAM using FORMAT.
2246 VALUE is a wide C-style string on the target. */
2249 printf_wide_c_string (struct ui_file
*stream
, const char *format
,
2250 struct value
*value
)
2255 struct gdbarch
*gdbarch
= get_type_arch (value_type (value
));
2256 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2257 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2258 "wchar_t", NULL
, 0);
2259 int wcwidth
= TYPE_LENGTH (wctype
);
2260 gdb_byte
*buf
= (gdb_byte
*) alloca (wcwidth
);
2262 tem
= value_as_address (value
);
2265 fprintf_filtered (stream
, format
, "(null)");
2269 /* This is a %s argument. Find the length of the string. */
2270 for (j
= 0;; j
+= wcwidth
)
2273 read_memory (tem
+ j
, buf
, wcwidth
);
2274 if (extract_unsigned_integer (buf
, wcwidth
, byte_order
) == 0)
2278 /* Copy the string contents into a string inside GDB. */
2279 str
= (gdb_byte
*) alloca (j
+ wcwidth
);
2281 read_memory (tem
, str
, j
);
2282 memset (&str
[j
], 0, wcwidth
);
2284 auto_obstack output
;
2286 convert_between_encodings (target_wide_charset (gdbarch
),
2289 &output
, translit_char
);
2290 obstack_grow_str0 (&output
, "");
2292 fprintf_filtered (stream
, format
, obstack_base (&output
));
2295 /* Subroutine of ui_printf to simplify it.
2296 Print VALUE, a floating point value, to STREAM using FORMAT. */
2299 printf_floating (struct ui_file
*stream
, const char *format
,
2300 struct value
*value
, enum argclass argclass
)
2302 /* Parameter data. */
2303 struct type
*param_type
= value_type (value
);
2304 struct gdbarch
*gdbarch
= get_type_arch (param_type
);
2305 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
2307 /* Determine target type corresponding to the format string. */
2308 struct type
*fmt_type
;
2312 fmt_type
= builtin_type (gdbarch
)->builtin_double
;
2314 case long_double_arg
:
2315 fmt_type
= builtin_type (gdbarch
)->builtin_long_double
;
2317 case dec32float_arg
:
2318 fmt_type
= builtin_type (gdbarch
)->builtin_decfloat
;
2320 case dec64float_arg
:
2321 fmt_type
= builtin_type (gdbarch
)->builtin_decdouble
;
2323 case dec128float_arg
:
2324 fmt_type
= builtin_type (gdbarch
)->builtin_declong
;
2327 gdb_assert_not_reached ("unexpected argument class");
2330 /* To match the traditional GDB behavior, the conversion is
2331 done differently depending on the type of the parameter:
2333 - if the parameter has floating-point type, it's value
2334 is converted to the target type;
2336 - otherwise, if the parameter has a type that is of the
2337 same size as a built-in floating-point type, the value
2338 bytes are interpreted as if they were of that type, and
2339 then converted to the target type (this is not done for
2340 decimal floating-point argument classes);
2342 - otherwise, if the source value has an integer value,
2343 it's value is converted to the target type;
2345 - otherwise, an error is raised.
2347 In either case, the result of the conversion is a byte buffer
2348 formatted in the target format for the target type. */
2350 if (TYPE_CODE (fmt_type
) == TYPE_CODE_FLT
)
2352 param_type
= float_type_from_length (param_type
);
2353 if (param_type
!= value_type (value
))
2354 value
= value_from_contents (param_type
, value_contents (value
));
2357 value
= value_cast (fmt_type
, value
);
2359 /* Convert the value to a string and print it. */
2361 = target_float_to_string (value_contents (value
), fmt_type
, format
);
2362 fputs_filtered (str
.c_str (), stream
);
2365 /* Subroutine of ui_printf to simplify it.
2366 Print VALUE, a target pointer, to STREAM using FORMAT. */
2369 printf_pointer (struct ui_file
*stream
, const char *format
,
2370 struct value
*value
)
2372 /* We avoid the host's %p because pointers are too
2373 likely to be the wrong size. The only interesting
2374 modifier for %p is a width; extract that, and then
2375 handle %p as glibc would: %#x or a literal "(nil)". */
2379 #ifdef PRINTF_HAS_LONG_LONG
2380 long long val
= value_as_long (value
);
2382 long val
= value_as_long (value
);
2385 fmt
= (char *) alloca (strlen (format
) + 5);
2387 /* Copy up to the leading %. */
2392 int is_percent
= (*p
== '%');
2407 /* Copy any width or flags. Only the "-" flag is valid for pointers
2408 -- see the format_pieces constructor. */
2409 while (*p
== '-' || (*p
>= '0' && *p
< '9'))
2412 gdb_assert (*p
== 'p' && *(p
+ 1) == '\0');
2415 #ifdef PRINTF_HAS_LONG_LONG
2421 fprintf_filtered (stream
, fmt
, val
);
2427 fprintf_filtered (stream
, fmt
, "(nil)");
2431 /* printf "printf format string" ARG to STREAM. */
2434 ui_printf (const char *arg
, struct ui_file
*stream
)
2436 const char *s
= arg
;
2437 std::vector
<struct value
*> val_args
;
2440 error_no_arg (_("format-control string and values to print"));
2442 s
= skip_spaces (s
);
2444 /* A format string should follow, enveloped in double quotes. */
2446 error (_("Bad format string, missing '\"'."));
2448 format_pieces
fpieces (&s
);
2451 error (_("Bad format string, non-terminated '\"'."));
2453 s
= skip_spaces (s
);
2455 if (*s
!= ',' && *s
!= 0)
2456 error (_("Invalid argument syntax"));
2460 s
= skip_spaces (s
);
2465 const char *current_substring
;
2468 for (auto &&piece
: fpieces
)
2469 if (piece
.argclass
!= literal_piece
)
2472 /* Now, parse all arguments and evaluate them.
2473 Store the VALUEs in VAL_ARGS. */
2480 val_args
.push_back (parse_to_comma_and_eval (&s1
));
2487 if (val_args
.size () != nargs_wanted
)
2488 error (_("Wrong number of arguments for specified format-string"));
2490 /* Now actually print them. */
2492 for (auto &&piece
: fpieces
)
2494 current_substring
= piece
.string
;
2495 switch (piece
.argclass
)
2498 printf_c_string (stream
, current_substring
, val_args
[i
]);
2500 case wide_string_arg
:
2501 printf_wide_c_string (stream
, current_substring
, val_args
[i
]);
2505 struct gdbarch
*gdbarch
2506 = get_type_arch (value_type (val_args
[i
]));
2507 struct type
*wctype
= lookup_typename (current_language
, gdbarch
,
2508 "wchar_t", NULL
, 0);
2509 struct type
*valtype
;
2510 const gdb_byte
*bytes
;
2512 valtype
= value_type (val_args
[i
]);
2513 if (TYPE_LENGTH (valtype
) != TYPE_LENGTH (wctype
)
2514 || TYPE_CODE (valtype
) != TYPE_CODE_INT
)
2515 error (_("expected wchar_t argument for %%lc"));
2517 bytes
= value_contents (val_args
[i
]);
2519 auto_obstack output
;
2521 convert_between_encodings (target_wide_charset (gdbarch
),
2523 bytes
, TYPE_LENGTH (valtype
),
2524 TYPE_LENGTH (valtype
),
2525 &output
, translit_char
);
2526 obstack_grow_str0 (&output
, "");
2528 fprintf_filtered (stream
, current_substring
,
2529 obstack_base (&output
));
2533 #ifdef PRINTF_HAS_LONG_LONG
2535 long long val
= value_as_long (val_args
[i
]);
2537 fprintf_filtered (stream
, current_substring
, val
);
2541 error (_("long long not supported in printf"));
2545 int val
= value_as_long (val_args
[i
]);
2547 fprintf_filtered (stream
, current_substring
, val
);
2552 long val
= value_as_long (val_args
[i
]);
2554 fprintf_filtered (stream
, current_substring
, val
);
2557 /* Handles floating-point values. */
2559 case long_double_arg
:
2560 case dec32float_arg
:
2561 case dec64float_arg
:
2562 case dec128float_arg
:
2563 printf_floating (stream
, current_substring
, val_args
[i
],
2567 printf_pointer (stream
, current_substring
, val_args
[i
]);
2570 /* Print a portion of the format string that has no
2571 directives. Note that this will not include any
2572 ordinary %-specs, but it might include "%%". That is
2573 why we use printf_filtered and not puts_filtered here.
2574 Also, we pass a dummy argument because some platforms
2575 have modified GCC to include -Wformat-security by
2576 default, which will warn here if there is no
2578 fprintf_filtered (stream
, current_substring
, 0);
2581 internal_error (__FILE__
, __LINE__
,
2582 _("failed internal consistency check"));
2584 /* Maybe advance to the next argument. */
2585 if (piece
.argclass
!= literal_piece
)
2591 /* Implement the "printf" command. */
2594 printf_command (const char *arg
, int from_tty
)
2596 ui_printf (arg
, gdb_stdout
);
2597 gdb_flush (gdb_stdout
);
2600 /* Implement the "eval" command. */
2603 eval_command (const char *arg
, int from_tty
)
2607 ui_printf (arg
, &stb
);
2609 std::string expanded
= insert_user_defined_cmd_args (stb
.c_str ());
2611 execute_command (expanded
.c_str (), from_tty
);
2615 _initialize_printcmd (void)
2617 struct cmd_list_element
*c
;
2619 current_display_number
= -1;
2621 gdb::observers::free_objfile
.attach (clear_dangling_display_expressions
);
2623 add_info ("address", info_address_command
,
2624 _("Describe where symbol SYM is stored."));
2626 add_info ("symbol", info_symbol_command
, _("\
2627 Describe what symbol is at location ADDR.\n\
2628 Only for symbols with fixed locations (global or static scope)."));
2630 add_com ("x", class_vars
, x_command
, _("\
2631 Examine memory: x/FMT ADDRESS.\n\
2632 ADDRESS is an expression for the memory address to examine.\n\
2633 FMT is a repeat count followed by a format letter and a size letter.\n\
2634 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2635 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2636 and z(hex, zero padded on the left).\n\
2637 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2638 The specified number of objects of the specified size are printed\n\
2639 according to the format. If a negative number is specified, memory is\n\
2640 examined backward from the address.\n\n\
2641 Defaults for format and size letters are those previously used.\n\
2642 Default count is 1. Default address is following last thing printed\n\
2643 with this command or \"print\"."));
2646 add_com ("whereis", class_vars
, whereis_command
,
2647 _("Print line number and file of definition of variable."));
2650 add_info ("display", info_display_command
, _("\
2651 Expressions to display when program stops, with code numbers."));
2653 add_cmd ("undisplay", class_vars
, undisplay_command
, _("\
2654 Cancel some expressions to be displayed when program stops.\n\
2655 Arguments are the code numbers of the expressions to stop displaying.\n\
2656 No argument means cancel all automatic-display expressions.\n\
2657 \"delete display\" has the same effect as this command.\n\
2658 Do \"info display\" to see current list of code numbers."),
2661 add_com ("display", class_vars
, display_command
, _("\
2662 Print value of expression EXP each time the program stops.\n\
2663 /FMT may be used before EXP as in the \"print\" command.\n\
2664 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2665 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2666 and examining is done as in the \"x\" command.\n\n\
2667 With no argument, display all currently requested auto-display expressions.\n\
2668 Use \"undisplay\" to cancel display requests previously made."));
2670 add_cmd ("display", class_vars
, enable_display_command
, _("\
2671 Enable some expressions to be displayed when program stops.\n\
2672 Arguments are the code numbers of the expressions to resume displaying.\n\
2673 No argument means enable all automatic-display expressions.\n\
2674 Do \"info display\" to see current list of code numbers."), &enablelist
);
2676 add_cmd ("display", class_vars
, disable_display_command
, _("\
2677 Disable some expressions to be displayed when program stops.\n\
2678 Arguments are the code numbers of the expressions to stop displaying.\n\
2679 No argument means disable all automatic-display expressions.\n\
2680 Do \"info display\" to see current list of code numbers."), &disablelist
);
2682 add_cmd ("display", class_vars
, undisplay_command
, _("\
2683 Cancel some expressions to be displayed when program stops.\n\
2684 Arguments are the code numbers of the expressions to stop displaying.\n\
2685 No argument means cancel all automatic-display expressions.\n\
2686 Do \"info display\" to see current list of code numbers."), &deletelist
);
2688 add_com ("printf", class_vars
, printf_command
, _("\
2689 Formatted printing, like the C \"printf\" function.\n\
2690 Usage: printf \"format string\", arg1, arg2, arg3, ..., argn\n\
2691 This supports most C printf format specifications, like %s, %d, etc."));
2693 add_com ("output", class_vars
, output_command
, _("\
2694 Like \"print\" but don't put in value history and don't print newline.\n\
2695 This is useful in user-defined commands."));
2697 add_prefix_cmd ("set", class_vars
, set_command
, _("\
2698 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2699 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2700 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2701 with $), a register (a few standard names starting with $), or an actual\n\
2702 variable in the program being debugged. EXP is any valid expression.\n\
2703 Use \"set variable\" for variables with names identical to set subcommands.\n\
2705 With a subcommand, this command modifies parts of the gdb environment.\n\
2706 You can see these environment settings with the \"show\" command."),
2707 &setlist
, "set ", 1, &cmdlist
);
2709 add_com ("assign", class_vars
, set_command
, _("\
2710 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2711 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2712 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2713 with $), a register (a few standard names starting with $), or an actual\n\
2714 variable in the program being debugged. EXP is any valid expression.\n\
2715 Use \"set variable\" for variables with names identical to set subcommands.\n\
2716 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2717 You can see these environment settings with the \"show\" command."));
2719 /* "call" is the same as "set", but handy for dbx users to call fns. */
2720 c
= add_com ("call", class_vars
, call_command
, _("\
2721 Call a function in the program.\n\
2722 The argument is the function name and arguments, in the notation of the\n\
2723 current working language. The result is printed and saved in the value\n\
2724 history, if it is not void."));
2725 set_cmd_completer (c
, expression_completer
);
2727 add_cmd ("variable", class_vars
, set_command
, _("\
2728 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2729 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2730 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2731 with $), a register (a few standard names starting with $), or an actual\n\
2732 variable in the program being debugged. EXP is any valid expression.\n\
2733 This may usually be abbreviated to simply \"set\"."),
2735 add_alias_cmd ("var", "variable", class_vars
, 0, &setlist
);
2737 c
= add_com ("print", class_vars
, print_command
, _("\
2738 Print value of expression EXP.\n\
2739 Variables accessible are those of the lexical environment of the selected\n\
2740 stack frame, plus all those whose scope is global or an entire file.\n\
2742 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2743 $$NUM refers to NUM'th value back from the last one.\n\
2744 Names starting with $ refer to registers (with the values they would have\n\
2745 if the program were to return to the stack frame now selected, restoring\n\
2746 all registers saved by frames farther in) or else to debugger\n\
2747 \"convenience\" variables (any such name not a known register).\n\
2748 Use assignment expressions to give values to convenience variables.\n\
2750 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2751 @ is a binary operator for treating consecutive data objects\n\
2752 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2753 element is FOO, whose second element is stored in the space following\n\
2754 where FOO is stored, etc. FOO must be an expression whose value\n\
2755 resides in memory.\n\
2757 EXP may be preceded with /FMT, where FMT is a format letter\n\
2758 but no count or size letter (see \"x\" command)."));
2759 set_cmd_completer (c
, expression_completer
);
2760 add_com_alias ("p", "print", class_vars
, 1);
2761 add_com_alias ("inspect", "print", class_vars
, 1);
2763 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class
,
2764 &max_symbolic_offset
, _("\
2765 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2766 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2767 Tell GDB to only display the symbolic form of an address if the\n\
2768 offset between the closest earlier symbol and the address is less than\n\
2769 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2770 to always print the symbolic form of an address if any symbol precedes\n\
2771 it. Zero is equivalent to \"unlimited\"."),
2773 show_max_symbolic_offset
,
2774 &setprintlist
, &showprintlist
);
2775 add_setshow_boolean_cmd ("symbol-filename", no_class
,
2776 &print_symbol_filename
, _("\
2777 Set printing of source filename and line number with <symbol>."), _("\
2778 Show printing of source filename and line number with <symbol>."), NULL
,
2780 show_print_symbol_filename
,
2781 &setprintlist
, &showprintlist
);
2783 add_com ("eval", no_class
, eval_command
, _("\
2784 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2785 a command line, and call it."));