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"
49 #include "cli/cli-style.h"
52 #include "common/byte-vector.h"
53 #include "cli/cli-style.h"
55 /* Last specified output format. */
57 static char last_format = 0;
59 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
61 static char last_size = 'w';
63 /* Last specified count for the 'x' command. */
65 static int last_count;
67 /* Default address to examine next, and associated architecture. */
69 static struct gdbarch *next_gdbarch;
70 static CORE_ADDR next_address;
72 /* Number of delay instructions following current disassembled insn. */
74 static int branch_delay_insns;
76 /* Last address examined. */
78 static CORE_ADDR last_examine_address;
80 /* Contents of last address examined.
81 This is not valid past the end of the `x' command! */
83 static value_ref_ptr last_examine_value;
85 /* Largest offset between a symbolic value and an address, that will be
86 printed as `0x1234 <symbol+offset>'. */
88 static unsigned int max_symbolic_offset = UINT_MAX;
90 show_max_symbolic_offset (struct ui_file *file, int from_tty,
91 struct cmd_list_element *c, const char *value)
93 fprintf_filtered (file,
94 _("The largest offset that will be "
95 "printed in <symbol+1234> form is %s.\n"),
99 /* Append the source filename and linenumber of the symbol when
100 printing a symbolic value as `<symbol at filename:linenum>' if set. */
101 static int print_symbol_filename = 0;
103 show_print_symbol_filename (struct ui_file *file, int from_tty,
104 struct cmd_list_element *c, const char *value)
106 fprintf_filtered (file, _("Printing of source filename and "
107 "line number with <symbol> is %s.\n"),
111 /* Number of auto-display expression currently being displayed.
112 So that we can disable it if we get a signal within it.
113 -1 when not doing one. */
115 static int current_display_number;
119 /* Chain link to next auto-display item. */
120 struct display *next;
122 /* The expression as the user typed it. */
125 /* Expression to be evaluated and displayed. */
128 /* Item number of this auto-display item. */
131 /* Display format specified. */
132 struct format_data format;
134 /* Program space associated with `block'. */
135 struct program_space *pspace;
137 /* Innermost block required by this expression when evaluated. */
138 const struct block *block;
140 /* Status of this display (enabled or disabled). */
144 /* Chain of expressions whose values should be displayed
145 automatically each time the program stops. */
147 static struct display *display_chain;
149 static int display_number;
151 /* Walk the following statement or block through all displays.
152 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
155 #define ALL_DISPLAYS(B) \
156 for (B = display_chain; B; B = B->next)
158 #define ALL_DISPLAYS_SAFE(B,TMP) \
159 for (B = display_chain; \
160 B ? (TMP = B->next, 1): 0; \
163 /* Prototypes for local functions. */
165 static void do_one_display (struct display *);
168 /* Decode a format specification. *STRING_PTR should point to it.
169 OFORMAT and OSIZE are used as defaults for the format and size
170 if none are given in the format specification.
171 If OSIZE is zero, then the size field of the returned value
172 should be set only if a size is explicitly specified by the
174 The structure returned describes all the data
175 found in the specification. In addition, *STRING_PTR is advanced
176 past the specification and past all whitespace following it. */
178 static struct format_data
179 decode_format (const char **string_ptr, int oformat, int osize)
181 struct format_data val;
182 const char *p = *string_ptr;
194 if (*p >= '0' && *p <= '9')
195 val.count *= atoi (p);
196 while (*p >= '0' && *p <= '9')
199 /* Now process size or format letters that follow. */
203 if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g')
210 else if (*p >= 'a' && *p <= 'z')
216 *string_ptr = skip_spaces (p);
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)
525 std::string name, filename;
530 if (build_address_symbolic (gdbarch, addr, do_demangle, &name, &offset,
531 &filename, &line, &unmapped))
534 fputs_filtered (leadin, stream);
536 fputs_filtered ("<*", stream);
538 fputs_filtered ("<", stream);
539 fputs_styled (name.c_str (), function_name_style.style (), stream);
541 fprintf_filtered (stream, "+%u", (unsigned int) offset);
543 /* Append source filename and line number if desired. Give specific
544 line # of this addr, if we have it; else line # of the nearest symbol. */
545 if (print_symbol_filename && !filename.empty ())
547 fputs_filtered (line == -1 ? " in " : " at ", stream);
548 fputs_styled (filename.c_str (), file_name_style.style (), stream);
550 fprintf_filtered (stream, ":%d", line);
553 fputs_filtered ("*>", stream);
555 fputs_filtered (">", stream);
560 /* See valprint.h. */
563 build_address_symbolic (struct gdbarch *gdbarch,
564 CORE_ADDR addr, /* IN */
565 int do_demangle, /* IN */
566 std::string *name, /* OUT */
567 int *offset, /* OUT */
568 std::string *filename, /* OUT */
570 int *unmapped) /* OUT */
572 struct bound_minimal_symbol msymbol;
573 struct symbol *symbol;
574 CORE_ADDR name_location = 0;
575 struct obj_section *section = NULL;
576 const char *name_temp = "";
578 /* Let's say it is mapped (not unmapped). */
581 /* Determine if the address is in an overlay, and whether it is
583 if (overlay_debugging)
585 section = find_pc_overlay (addr);
586 if (pc_in_unmapped_range (addr, section))
589 addr = overlay_mapped_address (addr, section);
593 /* First try to find the address in the symbol table, then
594 in the minsyms. Take the closest one. */
596 /* This is defective in the sense that it only finds text symbols. So
597 really this is kind of pointless--we should make sure that the
598 minimal symbols have everything we need (by changing that we could
599 save some memory, but for many debug format--ELF/DWARF or
600 anything/stabs--it would be inconvenient to eliminate those minimal
602 msymbol = lookup_minimal_symbol_by_pc_section (addr, section);
603 symbol = find_pc_sect_function (addr, section);
607 /* If this is a function (i.e. a code address), strip out any
608 non-address bits. For instance, display a pointer to the
609 first instruction of a Thumb function as <function>; the
610 second instruction will be <function+2>, even though the
611 pointer is <function+3>. This matches the ISA behavior. */
612 addr = gdbarch_addr_bits_remove (gdbarch, addr);
614 name_location = BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (symbol));
615 if (do_demangle || asm_demangle)
616 name_temp = SYMBOL_PRINT_NAME (symbol);
618 name_temp = SYMBOL_LINKAGE_NAME (symbol);
621 if (msymbol.minsym != NULL
622 && MSYMBOL_HAS_SIZE (msymbol.minsym)
623 && MSYMBOL_SIZE (msymbol.minsym) == 0
624 && MSYMBOL_TYPE (msymbol.minsym) != mst_text
625 && MSYMBOL_TYPE (msymbol.minsym) != mst_text_gnu_ifunc
626 && MSYMBOL_TYPE (msymbol.minsym) != mst_file_text)
627 msymbol.minsym = NULL;
629 if (msymbol.minsym != NULL)
631 if (BMSYMBOL_VALUE_ADDRESS (msymbol) > name_location || symbol == NULL)
633 /* If this is a function (i.e. a code address), strip out any
634 non-address bits. For instance, display a pointer to the
635 first instruction of a Thumb function as <function>; the
636 second instruction will be <function+2>, even though the
637 pointer is <function+3>. This matches the ISA behavior. */
638 if (MSYMBOL_TYPE (msymbol.minsym) == mst_text
639 || MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc
640 || MSYMBOL_TYPE (msymbol.minsym) == mst_file_text
641 || MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline)
642 addr = gdbarch_addr_bits_remove (gdbarch, addr);
644 /* The msymbol is closer to the address than the symbol;
645 use the msymbol instead. */
647 name_location = BMSYMBOL_VALUE_ADDRESS (msymbol);
648 if (do_demangle || asm_demangle)
649 name_temp = MSYMBOL_PRINT_NAME (msymbol.minsym);
651 name_temp = MSYMBOL_LINKAGE_NAME (msymbol.minsym);
654 if (symbol == NULL && msymbol.minsym == NULL)
657 /* If the nearest symbol is too far away, don't print anything symbolic. */
659 /* For when CORE_ADDR is larger than unsigned int, we do math in
660 CORE_ADDR. But when we detect unsigned wraparound in the
661 CORE_ADDR math, we ignore this test and print the offset,
662 because addr+max_symbolic_offset has wrapped through the end
663 of the address space back to the beginning, giving bogus comparison. */
664 if (addr > name_location + max_symbolic_offset
665 && name_location + max_symbolic_offset > name_location)
668 *offset = addr - name_location;
672 if (print_symbol_filename)
674 struct symtab_and_line sal;
676 sal = find_pc_sect_line (addr, section, 0);
680 *filename = symtab_to_filename_for_display (sal.symtab);
688 /* Print address ADDR symbolically on STREAM.
689 First print it as a number. Then perhaps print
690 <SYMBOL + OFFSET> after the number. */
693 print_address (struct gdbarch *gdbarch,
694 CORE_ADDR addr, struct ui_file *stream)
696 fputs_filtered (paddress (gdbarch, addr), stream);
697 print_address_symbolic (gdbarch, addr, stream, asm_demangle, " ");
700 /* Return a prefix for instruction address:
701 "=> " for current instruction, else " ". */
704 pc_prefix (CORE_ADDR addr)
706 if (has_stack_frames ())
708 struct frame_info *frame;
711 frame = get_selected_frame (NULL);
712 if (get_frame_pc_if_available (frame, &pc) && pc == addr)
718 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
719 controls whether to print the symbolic name "raw" or demangled.
720 Return non-zero if anything was printed; zero otherwise. */
723 print_address_demangle (const struct value_print_options *opts,
724 struct gdbarch *gdbarch, CORE_ADDR addr,
725 struct ui_file *stream, int do_demangle)
727 if (opts->addressprint)
729 fputs_filtered (paddress (gdbarch, addr), stream);
730 print_address_symbolic (gdbarch, addr, stream, do_demangle, " ");
734 return print_address_symbolic (gdbarch, addr, stream, do_demangle, "");
740 /* Find the address of the instruction that is INST_COUNT instructions before
741 the instruction at ADDR.
742 Since some architectures have variable-length instructions, we can't just
743 simply subtract INST_COUNT * INSN_LEN from ADDR. Instead, we use line
744 number information to locate the nearest known instruction boundary,
745 and disassemble forward from there. If we go out of the symbol range
746 during disassembling, we return the lowest address we've got so far and
747 set the number of instructions read to INST_READ. */
750 find_instruction_backward (struct gdbarch *gdbarch, CORE_ADDR addr,
751 int inst_count, int *inst_read)
753 /* The vector PCS is used to store instruction addresses within
755 CORE_ADDR loop_start, loop_end, p;
756 std::vector<CORE_ADDR> pcs;
757 struct symtab_and_line sal;
760 loop_start = loop_end = addr;
762 /* In each iteration of the outer loop, we get a pc range that ends before
763 LOOP_START, then we count and store every instruction address of the range
764 iterated in the loop.
765 If the number of instructions counted reaches INST_COUNT, return the
766 stored address that is located INST_COUNT instructions back from ADDR.
767 If INST_COUNT is not reached, we subtract the number of counted
768 instructions from INST_COUNT, and go to the next iteration. */
772 sal = find_pc_sect_line (loop_start, NULL, 1);
775 /* We reach here when line info is not available. In this case,
776 we print a message and just exit the loop. The return value
777 is calculated after the loop. */
778 printf_filtered (_("No line number information available "
781 print_address (gdbarch, loop_start - 1, gdb_stdout);
782 printf_filtered ("\n");
786 loop_end = loop_start;
789 /* This loop pushes instruction addresses in the range from
790 LOOP_START to LOOP_END. */
791 for (p = loop_start; p < loop_end;)
794 p += gdb_insn_length (gdbarch, p);
797 inst_count -= pcs.size ();
798 *inst_read += pcs.size ();
800 while (inst_count > 0);
802 /* After the loop, the vector PCS has instruction addresses of the last
803 source line we processed, and INST_COUNT has a negative value.
804 We return the address at the index of -INST_COUNT in the vector for
806 Let's assume the following instruction addresses and run 'x/-4i 0x400e'.
816 find_instruction_backward is called with INST_COUNT = 4 and expected to
817 return 0x4001. When we reach here, INST_COUNT is set to -1 because
818 it was subtracted by 2 (from Line Y) and 3 (from Line X). The value
819 4001 is located at the index 1 of the last iterated line (= Line X),
820 which is simply calculated by -INST_COUNT.
821 The case when the length of PCS is 0 means that we reached an area for
822 which line info is not available. In such case, we return LOOP_START,
823 which was the lowest instruction address that had line info. */
824 p = pcs.size () > 0 ? pcs[-inst_count] : loop_start;
826 /* INST_READ includes all instruction addresses in a pc range. Need to
827 exclude the beginning part up to the address we're returning. That
828 is, exclude {0x4000} in the example above. */
830 *inst_read += inst_count;
835 /* Backward read LEN bytes of target memory from address MEMADDR + LEN,
836 placing the results in GDB's memory from MYADDR + LEN. Returns
837 a count of the bytes actually read. */
840 read_memory_backward (struct gdbarch *gdbarch,
841 CORE_ADDR memaddr, gdb_byte *myaddr, int len)
844 int nread; /* Number of bytes actually read. */
846 /* First try a complete read. */
847 errcode = target_read_memory (memaddr, myaddr, len);
855 /* Loop, reading one byte at a time until we get as much as we can. */
858 for (nread = 0; nread < len; ++nread)
860 errcode = target_read_memory (--memaddr, --myaddr, 1);
863 /* The read was unsuccessful, so exit the loop. */
864 printf_filtered (_("Cannot access memory at address %s\n"),
865 paddress (gdbarch, memaddr));
873 /* Returns true if X (which is LEN bytes wide) is the number zero. */
876 integer_is_zero (const gdb_byte *x, int len)
880 while (i < len && x[i] == 0)
885 /* Find the start address of a string in which ADDR is included.
886 Basically we search for '\0' and return the next address,
887 but if OPTIONS->PRINT_MAX is smaller than the length of a string,
888 we stop searching and return the address to print characters as many as
889 PRINT_MAX from the string. */
892 find_string_backward (struct gdbarch *gdbarch,
893 CORE_ADDR addr, int count, int char_size,
894 const struct value_print_options *options,
895 int *strings_counted)
897 const int chunk_size = 0x20;
900 int chars_to_read = chunk_size;
901 int chars_counted = 0;
902 int count_original = count;
903 CORE_ADDR string_start_addr = addr;
905 gdb_assert (char_size == 1 || char_size == 2 || char_size == 4);
906 gdb::byte_vector buffer (chars_to_read * char_size);
907 while (count > 0 && read_error == 0)
911 addr -= chars_to_read * char_size;
912 chars_read = read_memory_backward (gdbarch, addr, buffer.data (),
913 chars_to_read * char_size);
914 chars_read /= char_size;
915 read_error = (chars_read == chars_to_read) ? 0 : 1;
916 /* Searching for '\0' from the end of buffer in backward direction. */
917 for (i = 0; i < chars_read && count > 0 ; ++i, ++chars_counted)
919 int offset = (chars_to_read - i - 1) * char_size;
921 if (integer_is_zero (&buffer[offset], char_size)
922 || chars_counted == options->print_max)
924 /* Found '\0' or reached print_max. As OFFSET is the offset to
925 '\0', we add CHAR_SIZE to return the start address of
928 string_start_addr = addr + offset + char_size;
934 /* Update STRINGS_COUNTED with the actual number of loaded strings. */
935 *strings_counted = count_original - count;
939 /* In error case, STRING_START_ADDR is pointing to the string that
940 was last successfully loaded. Rewind the partially loaded string. */
941 string_start_addr -= chars_counted * char_size;
944 return string_start_addr;
947 /* Examine data at address ADDR in format FMT.
948 Fetch it from memory and print on gdb_stdout. */
951 do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr)
956 struct type *val_type = NULL;
959 struct value_print_options opts;
960 int need_to_update_next_address = 0;
961 CORE_ADDR addr_rewound = 0;
966 next_gdbarch = gdbarch;
969 /* Instruction format implies fetch single bytes
970 regardless of the specified size.
971 The case of strings is handled in decode_format, only explicit
972 size operator are not changed to 'b'. */
978 /* Pick the appropriate size for an address. */
979 if (gdbarch_ptr_bit (next_gdbarch) == 64)
981 else if (gdbarch_ptr_bit (next_gdbarch) == 32)
983 else if (gdbarch_ptr_bit (next_gdbarch) == 16)
986 /* Bad value for gdbarch_ptr_bit. */
987 internal_error (__FILE__, __LINE__,
988 _("failed internal consistency check"));
992 val_type = builtin_type (next_gdbarch)->builtin_int8;
993 else if (size == 'h')
994 val_type = builtin_type (next_gdbarch)->builtin_int16;
995 else if (size == 'w')
996 val_type = builtin_type (next_gdbarch)->builtin_int32;
997 else if (size == 'g')
998 val_type = builtin_type (next_gdbarch)->builtin_int64;
1002 struct type *char_type = NULL;
1004 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
1005 if type is not found. */
1007 char_type = builtin_type (next_gdbarch)->builtin_char16;
1008 else if (size == 'w')
1009 char_type = builtin_type (next_gdbarch)->builtin_char32;
1011 val_type = char_type;
1014 if (size != '\0' && size != 'b')
1015 warning (_("Unable to display strings with "
1016 "size '%c', using 'b' instead."), size);
1018 val_type = builtin_type (next_gdbarch)->builtin_int8;
1027 if (format == 's' || format == 'i')
1030 get_formatted_print_options (&opts, format);
1034 /* This is the negative repeat count case.
1035 We rewind the address based on the given repeat count and format,
1036 then examine memory from there in forward direction. */
1041 next_address = find_instruction_backward (gdbarch, addr, count,
1044 else if (format == 's')
1046 next_address = find_string_backward (gdbarch, addr, count,
1047 TYPE_LENGTH (val_type),
1052 next_address = addr - count * TYPE_LENGTH (val_type);
1055 /* The following call to print_formatted updates next_address in every
1056 iteration. In backward case, we store the start address here
1057 and update next_address with it before exiting the function. */
1058 addr_rewound = (format == 's'
1059 ? next_address - TYPE_LENGTH (val_type)
1061 need_to_update_next_address = 1;
1064 /* Print as many objects as specified in COUNT, at most maxelts per line,
1065 with the address of the next one at the start of each line. */
1071 fputs_filtered (pc_prefix (next_address), gdb_stdout);
1072 print_address (next_gdbarch, next_address, gdb_stdout);
1073 printf_filtered (":");
1078 printf_filtered ("\t");
1079 /* Note that print_formatted sets next_address for the next
1081 last_examine_address = next_address;
1083 /* The value to be displayed is not fetched greedily.
1084 Instead, to avoid the possibility of a fetched value not
1085 being used, its retrieval is delayed until the print code
1086 uses it. When examining an instruction stream, the
1087 disassembler will perform its own memory fetch using just
1088 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
1089 the disassembler be modified so that LAST_EXAMINE_VALUE
1090 is left with the byte sequence from the last complete
1091 instruction fetched from memory? */
1093 = release_value (value_at_lazy (val_type, next_address));
1095 print_formatted (last_examine_value.get (), size, &opts, gdb_stdout);
1097 /* Display any branch delay slots following the final insn. */
1098 if (format == 'i' && count == 1)
1099 count += branch_delay_insns;
1101 printf_filtered ("\n");
1102 gdb_flush (gdb_stdout);
1105 if (need_to_update_next_address)
1106 next_address = addr_rewound;
1110 validate_format (struct format_data fmt, const char *cmdname)
1113 error (_("Size letters are meaningless in \"%s\" command."), cmdname);
1115 error (_("Item count other than 1 is meaningless in \"%s\" command."),
1117 if (fmt.format == 'i')
1118 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
1119 fmt.format, cmdname);
1122 /* Parse print command format string into *FMTP and update *EXPP.
1123 CMDNAME should name the current command. */
1126 print_command_parse_format (const char **expp, const char *cmdname,
1127 struct format_data *fmtp)
1129 const char *exp = *expp;
1131 if (exp && *exp == '/')
1134 *fmtp = decode_format (&exp, last_format, 0);
1135 validate_format (*fmtp, cmdname);
1136 last_format = fmtp->format;
1149 /* Print VAL to console according to *FMTP, including recording it to
1153 print_value (struct value *val, const struct format_data *fmtp)
1155 struct value_print_options opts;
1156 int histindex = record_latest_value (val);
1158 annotate_value_history_begin (histindex, value_type (val));
1160 printf_filtered ("$%d = ", histindex);
1162 annotate_value_history_value ();
1164 get_formatted_print_options (&opts, fmtp->format);
1165 opts.raw = fmtp->raw;
1167 print_formatted (val, fmtp->size, &opts, gdb_stdout);
1168 printf_filtered ("\n");
1170 annotate_value_history_end ();
1173 /* Evaluate string EXP as an expression in the current language and
1174 print the resulting value. EXP may contain a format specifier as the
1175 first argument ("/x myvar" for example, to print myvar in hex). */
1178 print_command_1 (const char *exp, int voidprint)
1181 struct format_data fmt;
1183 print_command_parse_format (&exp, "print", &fmt);
1187 expression_up expr = parse_expression (exp);
1188 val = evaluate_expression (expr.get ());
1191 val = access_value_history (0);
1193 if (voidprint || (val && value_type (val) &&
1194 TYPE_CODE (value_type (val)) != TYPE_CODE_VOID))
1195 print_value (val, &fmt);
1199 print_command (const char *exp, int from_tty)
1201 print_command_1 (exp, 1);
1204 /* Same as print, except it doesn't print void results. */
1206 call_command (const char *exp, int from_tty)
1208 print_command_1 (exp, 0);
1211 /* Implementation of the "output" command. */
1214 output_command (const char *exp, int from_tty)
1218 struct format_data fmt;
1219 struct value_print_options opts;
1224 if (exp && *exp == '/')
1227 fmt = decode_format (&exp, 0, 0);
1228 validate_format (fmt, "output");
1229 format = fmt.format;
1232 expression_up expr = parse_expression (exp);
1234 val = evaluate_expression (expr.get ());
1236 annotate_value_begin (value_type (val));
1238 get_formatted_print_options (&opts, format);
1240 print_formatted (val, fmt.size, &opts, gdb_stdout);
1242 annotate_value_end ();
1245 gdb_flush (gdb_stdout);
1249 set_command (const char *exp, int from_tty)
1251 expression_up expr = parse_expression (exp);
1253 if (expr->nelts >= 1)
1254 switch (expr->elts[0].opcode)
1256 case UNOP_PREINCREMENT:
1257 case UNOP_POSTINCREMENT:
1258 case UNOP_PREDECREMENT:
1259 case UNOP_POSTDECREMENT:
1261 case BINOP_ASSIGN_MODIFY:
1266 (_("Expression is not an assignment (and might have no effect)"));
1269 evaluate_expression (expr.get ());
1273 info_symbol_command (const char *arg, int from_tty)
1275 struct minimal_symbol *msymbol;
1276 struct objfile *objfile;
1277 struct obj_section *osect;
1278 CORE_ADDR addr, sect_addr;
1280 unsigned int offset;
1283 error_no_arg (_("address"));
1285 addr = parse_and_eval_address (arg);
1286 ALL_OBJSECTIONS (objfile, osect)
1288 /* Only process each object file once, even if there's a separate
1290 if (objfile->separate_debug_objfile_backlink)
1293 sect_addr = overlay_mapped_address (addr, osect);
1295 if (obj_section_addr (osect) <= sect_addr
1296 && sect_addr < obj_section_endaddr (osect)
1298 = lookup_minimal_symbol_by_pc_section (sect_addr, osect).minsym))
1300 const char *obj_name, *mapped, *sec_name, *msym_name;
1301 const char *loc_string;
1304 offset = sect_addr - MSYMBOL_VALUE_ADDRESS (objfile, msymbol);
1305 mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped");
1306 sec_name = osect->the_bfd_section->name;
1307 msym_name = MSYMBOL_PRINT_NAME (msymbol);
1309 /* Don't print the offset if it is zero.
1310 We assume there's no need to handle i18n of "sym + offset". */
1311 std::string string_holder;
1314 string_holder = string_printf ("%s + %u", msym_name, offset);
1315 loc_string = string_holder.c_str ();
1318 loc_string = msym_name;
1320 gdb_assert (osect->objfile && objfile_name (osect->objfile));
1321 obj_name = objfile_name (osect->objfile);
1323 if (MULTI_OBJFILE_P ())
1324 if (pc_in_unmapped_range (addr, osect))
1325 if (section_is_overlay (osect))
1326 printf_filtered (_("%s in load address range of "
1327 "%s overlay section %s of %s\n"),
1328 loc_string, mapped, sec_name, obj_name);
1330 printf_filtered (_("%s in load address range of "
1331 "section %s of %s\n"),
1332 loc_string, sec_name, obj_name);
1334 if (section_is_overlay (osect))
1335 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1336 loc_string, mapped, sec_name, obj_name);
1338 printf_filtered (_("%s in section %s of %s\n"),
1339 loc_string, sec_name, obj_name);
1341 if (pc_in_unmapped_range (addr, osect))
1342 if (section_is_overlay (osect))
1343 printf_filtered (_("%s in load address range of %s overlay "
1345 loc_string, mapped, sec_name);
1347 printf_filtered (_("%s in load address range of section %s\n"),
1348 loc_string, sec_name);
1350 if (section_is_overlay (osect))
1351 printf_filtered (_("%s in %s overlay section %s\n"),
1352 loc_string, mapped, sec_name);
1354 printf_filtered (_("%s in section %s\n"),
1355 loc_string, sec_name);
1359 printf_filtered (_("No symbol matches %s.\n"), arg);
1363 info_address_command (const char *exp, int from_tty)
1365 struct gdbarch *gdbarch;
1368 struct bound_minimal_symbol msymbol;
1370 struct obj_section *section;
1371 CORE_ADDR load_addr, context_pc = 0;
1372 struct field_of_this_result is_a_field_of_this;
1375 error (_("Argument required."));
1377 sym = lookup_symbol (exp, get_selected_block (&context_pc), VAR_DOMAIN,
1378 &is_a_field_of_this).symbol;
1381 if (is_a_field_of_this.type != NULL)
1383 printf_filtered ("Symbol \"");
1384 fprintf_symbol_filtered (gdb_stdout, exp,
1385 current_language->la_language, DMGL_ANSI);
1386 printf_filtered ("\" is a field of the local class variable ");
1387 if (current_language->la_language == language_objc)
1388 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1390 printf_filtered ("`this'\n");
1394 msymbol = lookup_bound_minimal_symbol (exp);
1396 if (msymbol.minsym != NULL)
1398 struct objfile *objfile = msymbol.objfile;
1400 gdbarch = get_objfile_arch (objfile);
1401 load_addr = BMSYMBOL_VALUE_ADDRESS (msymbol);
1403 printf_filtered ("Symbol \"");
1404 fprintf_symbol_filtered (gdb_stdout, exp,
1405 current_language->la_language, DMGL_ANSI);
1406 printf_filtered ("\" is at ");
1407 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1408 printf_filtered (" in a file compiled without debugging");
1409 section = MSYMBOL_OBJ_SECTION (objfile, msymbol.minsym);
1410 if (section_is_overlay (section))
1412 load_addr = overlay_unmapped_address (load_addr, section);
1413 printf_filtered (",\n -- loaded at ");
1414 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1415 printf_filtered (" in overlay section %s",
1416 section->the_bfd_section->name);
1418 printf_filtered (".\n");
1421 error (_("No symbol \"%s\" in current context."), exp);
1425 printf_filtered ("Symbol \"");
1426 fprintf_symbol_filtered (gdb_stdout, SYMBOL_PRINT_NAME (sym),
1427 current_language->la_language, DMGL_ANSI);
1428 printf_filtered ("\" is ");
1429 val = SYMBOL_VALUE (sym);
1430 if (SYMBOL_OBJFILE_OWNED (sym))
1431 section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym);
1434 gdbarch = symbol_arch (sym);
1436 if (SYMBOL_COMPUTED_OPS (sym) != NULL)
1438 SYMBOL_COMPUTED_OPS (sym)->describe_location (sym, context_pc,
1440 printf_filtered (".\n");
1444 switch (SYMBOL_CLASS (sym))
1447 case LOC_CONST_BYTES:
1448 printf_filtered ("constant");
1452 printf_filtered ("a label at address ");
1453 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1454 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1455 if (section_is_overlay (section))
1457 load_addr = overlay_unmapped_address (load_addr, section);
1458 printf_filtered (",\n -- loaded at ");
1459 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1460 printf_filtered (" in overlay section %s",
1461 section->the_bfd_section->name);
1466 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1469 /* GDBARCH is the architecture associated with the objfile the symbol
1470 is defined in; the target architecture may be different, and may
1471 provide additional registers. However, we do not know the target
1472 architecture at this point. We assume the objfile architecture
1473 will contain all the standard registers that occur in debug info
1475 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1477 if (SYMBOL_IS_ARGUMENT (sym))
1478 printf_filtered (_("an argument in register %s"),
1479 gdbarch_register_name (gdbarch, regno));
1481 printf_filtered (_("a variable in register %s"),
1482 gdbarch_register_name (gdbarch, regno));
1486 printf_filtered (_("static storage at address "));
1487 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1488 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1489 if (section_is_overlay (section))
1491 load_addr = overlay_unmapped_address (load_addr, section);
1492 printf_filtered (_(",\n -- loaded at "));
1493 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1494 printf_filtered (_(" in overlay section %s"),
1495 section->the_bfd_section->name);
1499 case LOC_REGPARM_ADDR:
1500 /* Note comment at LOC_REGISTER. */
1501 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1502 printf_filtered (_("address of an argument in register %s"),
1503 gdbarch_register_name (gdbarch, regno));
1507 printf_filtered (_("an argument at offset %ld"), val);
1511 printf_filtered (_("a local variable at frame offset %ld"), val);
1515 printf_filtered (_("a reference argument at offset %ld"), val);
1519 printf_filtered (_("a typedef"));
1523 printf_filtered (_("a function at address "));
1524 load_addr = BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym));
1525 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1526 if (section_is_overlay (section))
1528 load_addr = overlay_unmapped_address (load_addr, section);
1529 printf_filtered (_(",\n -- loaded at "));
1530 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1531 printf_filtered (_(" in overlay section %s"),
1532 section->the_bfd_section->name);
1536 case LOC_UNRESOLVED:
1538 struct bound_minimal_symbol msym;
1540 msym = lookup_bound_minimal_symbol (SYMBOL_LINKAGE_NAME (sym));
1541 if (msym.minsym == NULL)
1542 printf_filtered ("unresolved");
1545 section = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym);
1548 && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
1550 load_addr = MSYMBOL_VALUE_RAW_ADDRESS (msym.minsym);
1551 printf_filtered (_("a thread-local variable at offset %s "
1552 "in the thread-local storage for `%s'"),
1553 paddress (gdbarch, load_addr),
1554 objfile_name (section->objfile));
1558 load_addr = BMSYMBOL_VALUE_ADDRESS (msym);
1559 printf_filtered (_("static storage at address "));
1560 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1561 if (section_is_overlay (section))
1563 load_addr = overlay_unmapped_address (load_addr, section);
1564 printf_filtered (_(",\n -- loaded at "));
1565 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1566 printf_filtered (_(" in overlay section %s"),
1567 section->the_bfd_section->name);
1574 case LOC_OPTIMIZED_OUT:
1575 printf_filtered (_("optimized out"));
1579 printf_filtered (_("of unknown (botched) type"));
1582 printf_filtered (".\n");
1587 x_command (const char *exp, int from_tty)
1589 struct format_data fmt;
1592 fmt.format = last_format ? last_format : 'x';
1593 fmt.size = last_size;
1597 /* If there is no expression and no format, use the most recent
1599 if (exp == nullptr && last_count > 0)
1600 fmt.count = last_count;
1602 if (exp && *exp == '/')
1604 const char *tmp = exp + 1;
1606 fmt = decode_format (&tmp, last_format, last_size);
1610 last_count = fmt.count;
1612 /* If we have an expression, evaluate it and use it as the address. */
1614 if (exp != 0 && *exp != 0)
1616 expression_up expr = parse_expression (exp);
1617 /* Cause expression not to be there any more if this command is
1618 repeated with Newline. But don't clobber a user-defined
1619 command's definition. */
1621 set_repeat_arguments ("");
1622 val = evaluate_expression (expr.get ());
1623 if (TYPE_IS_REFERENCE (value_type (val)))
1624 val = coerce_ref (val);
1625 /* In rvalue contexts, such as this, functions are coerced into
1626 pointers to functions. This makes "x/i main" work. */
1627 if (/* last_format == 'i' && */
1628 TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC
1629 && VALUE_LVAL (val) == lval_memory)
1630 next_address = value_address (val);
1632 next_address = value_as_address (val);
1634 next_gdbarch = expr->gdbarch;
1638 error_no_arg (_("starting display address"));
1640 do_examine (fmt, next_gdbarch, next_address);
1642 /* If the examine succeeds, we remember its size and format for next
1643 time. Set last_size to 'b' for strings. */
1644 if (fmt.format == 's')
1647 last_size = fmt.size;
1648 last_format = fmt.format;
1650 /* Set a couple of internal variables if appropriate. */
1651 if (last_examine_value != nullptr)
1653 /* Make last address examined available to the user as $_. Use
1654 the correct pointer type. */
1655 struct type *pointer_type
1656 = lookup_pointer_type (value_type (last_examine_value.get ()));
1657 set_internalvar (lookup_internalvar ("_"),
1658 value_from_pointer (pointer_type,
1659 last_examine_address));
1661 /* Make contents of last address examined available to the user
1662 as $__. If the last value has not been fetched from memory
1663 then don't fetch it now; instead mark it by voiding the $__
1665 if (value_lazy (last_examine_value.get ()))
1666 clear_internalvar (lookup_internalvar ("__"));
1668 set_internalvar (lookup_internalvar ("__"), last_examine_value.get ());
1673 /* Add an expression to the auto-display chain.
1674 Specify the expression. */
1677 display_command (const char *arg, int from_tty)
1679 struct format_data fmt;
1680 struct display *newobj;
1681 const char *exp = arg;
1692 fmt = decode_format (&exp, 0, 0);
1693 if (fmt.size && fmt.format == 0)
1695 if (fmt.format == 'i' || fmt.format == 's')
1706 innermost_block.reset ();
1707 expression_up expr = parse_expression (exp);
1709 newobj = new display ();
1711 newobj->exp_string = xstrdup (exp);
1712 newobj->exp = std::move (expr);
1713 newobj->block = innermost_block.block ();
1714 newobj->pspace = current_program_space;
1715 newobj->number = ++display_number;
1716 newobj->format = fmt;
1717 newobj->enabled_p = 1;
1718 newobj->next = NULL;
1720 if (display_chain == NULL)
1721 display_chain = newobj;
1724 struct display *last;
1726 for (last = display_chain; last->next != NULL; last = last->next)
1728 last->next = newobj;
1732 do_one_display (newobj);
1738 free_display (struct display *d)
1740 xfree (d->exp_string);
1744 /* Clear out the display_chain. Done when new symtabs are loaded,
1745 since this invalidates the types stored in many expressions. */
1748 clear_displays (void)
1752 while ((d = display_chain) != NULL)
1754 display_chain = d->next;
1759 /* Delete the auto-display DISPLAY. */
1762 delete_display (struct display *display)
1766 gdb_assert (display != NULL);
1768 if (display_chain == display)
1769 display_chain = display->next;
1772 if (d->next == display)
1774 d->next = display->next;
1778 free_display (display);
1781 /* Call FUNCTION on each of the displays whose numbers are given in
1782 ARGS. DATA is passed unmodified to FUNCTION. */
1785 map_display_numbers (const char *args,
1786 void (*function) (struct display *,
1793 error_no_arg (_("one or more display numbers"));
1795 number_or_range_parser parser (args);
1797 while (!parser.finished ())
1799 const char *p = parser.cur_tok ();
1801 num = parser.get_number ();
1803 warning (_("bad display number at or near '%s'"), p);
1806 struct display *d, *tmp;
1808 ALL_DISPLAYS_SAFE (d, tmp)
1809 if (d->number == num)
1812 printf_unfiltered (_("No display number %d.\n"), num);
1819 /* Callback for map_display_numbers, that deletes a display. */
1822 do_delete_display (struct display *d, void *data)
1827 /* "undisplay" command. */
1830 undisplay_command (const char *args, int from_tty)
1834 if (query (_("Delete all auto-display expressions? ")))
1840 map_display_numbers (args, do_delete_display, NULL);
1844 /* Display a single auto-display.
1845 Do nothing if the display cannot be printed in the current context,
1846 or if the display is disabled. */
1849 do_one_display (struct display *d)
1851 int within_current_scope;
1853 if (d->enabled_p == 0)
1856 /* The expression carries the architecture that was used at parse time.
1857 This is a problem if the expression depends on architecture features
1858 (e.g. register numbers), and the current architecture is now different.
1859 For example, a display statement like "display/i $pc" is expected to
1860 display the PC register of the current architecture, not the arch at
1861 the time the display command was given. Therefore, we re-parse the
1862 expression if the current architecture has changed. */
1863 if (d->exp != NULL && d->exp->gdbarch != get_current_arch ())
1874 innermost_block.reset ();
1875 d->exp = parse_expression (d->exp_string);
1876 d->block = innermost_block.block ();
1878 CATCH (ex, RETURN_MASK_ALL)
1880 /* Can't re-parse the expression. Disable this display item. */
1882 warning (_("Unable to display \"%s\": %s"),
1883 d->exp_string, ex.message);
1891 if (d->pspace == current_program_space)
1892 within_current_scope = contained_in (get_selected_block (0), d->block);
1894 within_current_scope = 0;
1897 within_current_scope = 1;
1898 if (!within_current_scope)
1901 scoped_restore save_display_number
1902 = make_scoped_restore (¤t_display_number, d->number);
1904 annotate_display_begin ();
1905 printf_filtered ("%d", d->number);
1906 annotate_display_number_end ();
1907 printf_filtered (": ");
1911 annotate_display_format ();
1913 printf_filtered ("x/");
1914 if (d->format.count != 1)
1915 printf_filtered ("%d", d->format.count);
1916 printf_filtered ("%c", d->format.format);
1917 if (d->format.format != 'i' && d->format.format != 's')
1918 printf_filtered ("%c", d->format.size);
1919 printf_filtered (" ");
1921 annotate_display_expression ();
1923 puts_filtered (d->exp_string);
1924 annotate_display_expression_end ();
1926 if (d->format.count != 1 || d->format.format == 'i')
1927 printf_filtered ("\n");
1929 printf_filtered (" ");
1931 annotate_display_value ();
1938 val = evaluate_expression (d->exp.get ());
1939 addr = value_as_address (val);
1940 if (d->format.format == 'i')
1941 addr = gdbarch_addr_bits_remove (d->exp->gdbarch, addr);
1942 do_examine (d->format, d->exp->gdbarch, addr);
1944 CATCH (ex, RETURN_MASK_ERROR)
1946 fprintf_filtered (gdb_stdout, _("<error: %s>\n"), ex.message);
1952 struct value_print_options opts;
1954 annotate_display_format ();
1956 if (d->format.format)
1957 printf_filtered ("/%c ", d->format.format);
1959 annotate_display_expression ();
1961 puts_filtered (d->exp_string);
1962 annotate_display_expression_end ();
1964 printf_filtered (" = ");
1966 annotate_display_expression ();
1968 get_formatted_print_options (&opts, d->format.format);
1969 opts.raw = d->format.raw;
1975 val = evaluate_expression (d->exp.get ());
1976 print_formatted (val, d->format.size, &opts, gdb_stdout);
1978 CATCH (ex, RETURN_MASK_ERROR)
1980 fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message);
1984 printf_filtered ("\n");
1987 annotate_display_end ();
1989 gdb_flush (gdb_stdout);
1992 /* Display all of the values on the auto-display chain which can be
1993 evaluated in the current scope. */
2000 for (d = display_chain; d; d = d->next)
2004 /* Delete the auto-display which we were in the process of displaying.
2005 This is done when there is an error or a signal. */
2008 disable_display (int num)
2012 for (d = display_chain; d; d = d->next)
2013 if (d->number == num)
2018 printf_unfiltered (_("No display number %d.\n"), num);
2022 disable_current_display (void)
2024 if (current_display_number >= 0)
2026 disable_display (current_display_number);
2027 fprintf_unfiltered (gdb_stderr,
2028 _("Disabling display %d to "
2029 "avoid infinite recursion.\n"),
2030 current_display_number);
2032 current_display_number = -1;
2036 info_display_command (const char *ignore, int from_tty)
2041 printf_unfiltered (_("There are no auto-display expressions now.\n"));
2043 printf_filtered (_("Auto-display expressions now in effect:\n\
2044 Num Enb Expression\n"));
2046 for (d = display_chain; d; d = d->next)
2048 printf_filtered ("%d: %c ", d->number, "ny"[(int) d->enabled_p]);
2050 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
2052 else if (d->format.format)
2053 printf_filtered ("/%c ", d->format.format);
2054 puts_filtered (d->exp_string);
2055 if (d->block && !contained_in (get_selected_block (0), d->block))
2056 printf_filtered (_(" (cannot be evaluated in the current context)"));
2057 printf_filtered ("\n");
2058 gdb_flush (gdb_stdout);
2062 /* Callback fo map_display_numbers, that enables or disables the
2063 passed in display D. */
2066 do_enable_disable_display (struct display *d, void *data)
2068 d->enabled_p = *(int *) data;
2071 /* Implamentation of both the "disable display" and "enable display"
2072 commands. ENABLE decides what to do. */
2075 enable_disable_display_command (const char *args, int from_tty, int enable)
2082 d->enabled_p = enable;
2086 map_display_numbers (args, do_enable_disable_display, &enable);
2089 /* The "enable display" command. */
2092 enable_display_command (const char *args, int from_tty)
2094 enable_disable_display_command (args, from_tty, 1);
2097 /* The "disable display" command. */
2100 disable_display_command (const char *args, int from_tty)
2102 enable_disable_display_command (args, from_tty, 0);
2105 /* display_chain items point to blocks and expressions. Some expressions in
2106 turn may point to symbols.
2107 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
2108 obstack_free'd when a shared library is unloaded.
2109 Clear pointers that are about to become dangling.
2110 Both .exp and .block fields will be restored next time we need to display
2111 an item by re-parsing .exp_string field in the new execution context. */
2114 clear_dangling_display_expressions (struct objfile *objfile)
2117 struct program_space *pspace;
2119 /* With no symbol file we cannot have a block or expression from it. */
2120 if (objfile == NULL)
2122 pspace = objfile->pspace;
2123 if (objfile->separate_debug_objfile_backlink)
2125 objfile = objfile->separate_debug_objfile_backlink;
2126 gdb_assert (objfile->pspace == pspace);
2129 for (d = display_chain; d != NULL; d = d->next)
2131 if (d->pspace != pspace)
2134 if (lookup_objfile_from_block (d->block) == objfile
2135 || (d->exp != NULL && exp_uses_objfile (d->exp.get (), objfile)))
2144 /* Print the value in stack frame FRAME of a variable specified by a
2145 struct symbol. NAME is the name to print; if NULL then VAR's print
2146 name will be used. STREAM is the ui_file on which to print the
2147 value. INDENT specifies the number of indent levels to print
2148 before printing the variable name.
2150 This function invalidates FRAME. */
2153 print_variable_and_value (const char *name, struct symbol *var,
2154 struct frame_info *frame,
2155 struct ui_file *stream, int indent)
2159 name = SYMBOL_PRINT_NAME (var);
2161 fputs_filtered (n_spaces (2 * indent), stream);
2162 fputs_styled (name, variable_name_style.style (), stream);
2163 fputs_filtered (" = ", stream);
2168 struct value_print_options opts;
2170 /* READ_VAR_VALUE needs a block in order to deal with non-local
2171 references (i.e. to handle nested functions). In this context, we
2172 print variables that are local to this frame, so we can avoid passing
2174 val = read_var_value (var, NULL, frame);
2175 get_user_print_options (&opts);
2177 common_val_print (val, stream, indent, &opts, current_language);
2179 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2183 CATCH (except, RETURN_MASK_ERROR)
2185 fprintf_filtered(stream, "<error reading variable %s (%s)>", name,
2190 fprintf_filtered (stream, "\n");
2193 /* Subroutine of ui_printf to simplify it.
2194 Print VALUE to STREAM using FORMAT.
2195 VALUE is a C-style string on the target. */
2198 printf_c_string (struct ui_file *stream, const char *format,
2199 struct value *value)
2205 tem = value_as_address (value);
2209 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2210 fprintf_filtered (stream, format, "(null)");
2215 /* This is a %s argument. Find the length of the string. */
2221 read_memory (tem + j, &c, 1);
2226 /* Copy the string contents into a string inside GDB. */
2227 str = (gdb_byte *) alloca (j + 1);
2229 read_memory (tem, str, j);
2233 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2234 fprintf_filtered (stream, format, (char *) str);
2238 /* Subroutine of ui_printf to simplify it.
2239 Print VALUE to STREAM using FORMAT.
2240 VALUE is a wide C-style string on the target. */
2243 printf_wide_c_string (struct ui_file *stream, const char *format,
2244 struct value *value)
2249 struct gdbarch *gdbarch = get_type_arch (value_type (value));
2250 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2251 struct type *wctype = lookup_typename (current_language, gdbarch,
2252 "wchar_t", NULL, 0);
2253 int wcwidth = TYPE_LENGTH (wctype);
2254 gdb_byte *buf = (gdb_byte *) alloca (wcwidth);
2256 tem = value_as_address (value);
2260 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2261 fprintf_filtered (stream, format, "(null)");
2266 /* This is a %s argument. Find the length of the string. */
2267 for (j = 0;; j += wcwidth)
2270 read_memory (tem + j, buf, wcwidth);
2271 if (extract_unsigned_integer (buf, wcwidth, byte_order) == 0)
2275 /* Copy the string contents into a string inside GDB. */
2276 str = (gdb_byte *) alloca (j + wcwidth);
2278 read_memory (tem, str, j);
2279 memset (&str[j], 0, wcwidth);
2281 auto_obstack output;
2283 convert_between_encodings (target_wide_charset (gdbarch),
2286 &output, translit_char);
2287 obstack_grow_str0 (&output, "");
2290 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2291 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);
2306 /* Determine target type corresponding to the format string. */
2307 struct type *fmt_type;
2311 fmt_type = builtin_type (gdbarch)->builtin_double;
2313 case long_double_arg:
2314 fmt_type = builtin_type (gdbarch)->builtin_long_double;
2316 case dec32float_arg:
2317 fmt_type = builtin_type (gdbarch)->builtin_decfloat;
2319 case dec64float_arg:
2320 fmt_type = builtin_type (gdbarch)->builtin_decdouble;
2322 case dec128float_arg:
2323 fmt_type = builtin_type (gdbarch)->builtin_declong;
2326 gdb_assert_not_reached ("unexpected argument class");
2329 /* To match the traditional GDB behavior, the conversion is
2330 done differently depending on the type of the parameter:
2332 - if the parameter has floating-point type, it's value
2333 is converted to the target type;
2335 - otherwise, if the parameter has a type that is of the
2336 same size as a built-in floating-point type, the value
2337 bytes are interpreted as if they were of that type, and
2338 then converted to the target type (this is not done for
2339 decimal floating-point argument classes);
2341 - otherwise, if the source value has an integer value,
2342 it's value is converted to the target type;
2344 - otherwise, an error is raised.
2346 In either case, the result of the conversion is a byte buffer
2347 formatted in the target format for the target type. */
2349 if (TYPE_CODE (fmt_type) == TYPE_CODE_FLT)
2351 param_type = float_type_from_length (param_type);
2352 if (param_type != value_type (value))
2353 value = value_from_contents (param_type, value_contents (value));
2356 value = value_cast (fmt_type, value);
2358 /* Convert the value to a string and print it. */
2360 = target_float_to_string (value_contents (value), fmt_type, format);
2361 fputs_filtered (str.c_str (), stream);
2364 /* Subroutine of ui_printf to simplify it.
2365 Print VALUE, a target pointer, to STREAM using FORMAT. */
2368 printf_pointer (struct ui_file *stream, const char *format,
2369 struct value *value)
2371 /* We avoid the host's %p because pointers are too
2372 likely to be the wrong size. The only interesting
2373 modifier for %p is a width; extract that, and then
2374 handle %p as glibc would: %#x or a literal "(nil)". */
2378 #ifdef PRINTF_HAS_LONG_LONG
2379 long long val = value_as_long (value);
2381 long val = value_as_long (value);
2384 fmt = (char *) alloca (strlen (format) + 5);
2386 /* Copy up to the leading %. */
2391 int is_percent = (*p == '%');
2406 /* Copy any width or flags. Only the "-" flag is valid for pointers
2407 -- see the format_pieces constructor. */
2408 while (*p == '-' || (*p >= '0' && *p < '9'))
2411 gdb_assert (*p == 'p' && *(p + 1) == '\0');
2414 #ifdef PRINTF_HAS_LONG_LONG
2421 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2422 fprintf_filtered (stream, fmt, val);
2430 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2431 fprintf_filtered (stream, fmt, "(nil)");
2436 /* printf "printf format string" ARG to STREAM. */
2439 ui_printf (const char *arg, struct ui_file *stream)
2441 const char *s = arg;
2442 std::vector<struct value *> val_args;
2445 error_no_arg (_("format-control string and values to print"));
2447 s = skip_spaces (s);
2449 /* A format string should follow, enveloped in double quotes. */
2451 error (_("Bad format string, missing '\"'."));
2453 format_pieces fpieces (&s);
2456 error (_("Bad format string, non-terminated '\"'."));
2458 s = skip_spaces (s);
2460 if (*s != ',' && *s != 0)
2461 error (_("Invalid argument syntax"));
2465 s = skip_spaces (s);
2470 const char *current_substring;
2473 for (auto &&piece : fpieces)
2474 if (piece.argclass != literal_piece)
2477 /* Now, parse all arguments and evaluate them.
2478 Store the VALUEs in VAL_ARGS. */
2485 val_args.push_back (parse_to_comma_and_eval (&s1));
2492 if (val_args.size () != nargs_wanted)
2493 error (_("Wrong number of arguments for specified format-string"));
2495 /* Now actually print them. */
2497 for (auto &&piece : fpieces)
2499 current_substring = piece.string;
2500 switch (piece.argclass)
2503 printf_c_string (stream, current_substring, val_args[i]);
2505 case wide_string_arg:
2506 printf_wide_c_string (stream, current_substring, val_args[i]);
2510 struct gdbarch *gdbarch
2511 = get_type_arch (value_type (val_args[i]));
2512 struct type *wctype = lookup_typename (current_language, gdbarch,
2513 "wchar_t", NULL, 0);
2514 struct type *valtype;
2515 const gdb_byte *bytes;
2517 valtype = value_type (val_args[i]);
2518 if (TYPE_LENGTH (valtype) != TYPE_LENGTH (wctype)
2519 || TYPE_CODE (valtype) != TYPE_CODE_INT)
2520 error (_("expected wchar_t argument for %%lc"));
2522 bytes = value_contents (val_args[i]);
2524 auto_obstack output;
2526 convert_between_encodings (target_wide_charset (gdbarch),
2528 bytes, TYPE_LENGTH (valtype),
2529 TYPE_LENGTH (valtype),
2530 &output, translit_char);
2531 obstack_grow_str0 (&output, "");
2534 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2535 fprintf_filtered (stream, current_substring,
2536 obstack_base (&output));
2541 #ifdef PRINTF_HAS_LONG_LONG
2543 long long val = value_as_long (val_args[i]);
2546 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2547 fprintf_filtered (stream, current_substring, val);
2552 error (_("long long not supported in printf"));
2556 int val = value_as_long (val_args[i]);
2559 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2560 fprintf_filtered (stream, current_substring, val);
2566 long val = value_as_long (val_args[i]);
2569 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2570 fprintf_filtered (stream, current_substring, val);
2574 /* Handles floating-point values. */
2576 case long_double_arg:
2577 case dec32float_arg:
2578 case dec64float_arg:
2579 case dec128float_arg:
2580 printf_floating (stream, current_substring, val_args[i],
2584 printf_pointer (stream, current_substring, val_args[i]);
2587 /* Print a portion of the format string that has no
2588 directives. Note that this will not include any
2589 ordinary %-specs, but it might include "%%". That is
2590 why we use printf_filtered and not puts_filtered here.
2591 Also, we pass a dummy argument because some platforms
2592 have modified GCC to include -Wformat-security by
2593 default, which will warn here if there is no
2596 DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
2597 fprintf_filtered (stream, current_substring, 0);
2601 internal_error (__FILE__, __LINE__,
2602 _("failed internal consistency check"));
2604 /* Maybe advance to the next argument. */
2605 if (piece.argclass != literal_piece)
2611 /* Implement the "printf" command. */
2614 printf_command (const char *arg, int from_tty)
2616 ui_printf (arg, gdb_stdout);
2617 reset_terminal_style (gdb_stdout);
2619 gdb_flush (gdb_stdout);
2622 /* Implement the "eval" command. */
2625 eval_command (const char *arg, int from_tty)
2629 ui_printf (arg, &stb);
2631 std::string expanded = insert_user_defined_cmd_args (stb.c_str ());
2633 execute_command (expanded.c_str (), from_tty);
2637 _initialize_printcmd (void)
2639 struct cmd_list_element *c;
2641 current_display_number = -1;
2643 gdb::observers::free_objfile.attach (clear_dangling_display_expressions);
2645 add_info ("address", info_address_command,
2646 _("Describe where symbol SYM is stored."));
2648 add_info ("symbol", info_symbol_command, _("\
2649 Describe what symbol is at location ADDR.\n\
2650 Only for symbols with fixed locations (global or static scope)."));
2652 add_com ("x", class_vars, x_command, _("\
2653 Examine memory: x/FMT ADDRESS.\n\
2654 ADDRESS is an expression for the memory address to examine.\n\
2655 FMT is a repeat count followed by a format letter and a size letter.\n\
2656 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2657 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2658 and z(hex, zero padded on the left).\n\
2659 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2660 The specified number of objects of the specified size are printed\n\
2661 according to the format. If a negative number is specified, memory is\n\
2662 examined backward from the address.\n\n\
2663 Defaults for format and size letters are those previously used.\n\
2664 Default count is 1. Default address is following last thing printed\n\
2665 with this command or \"print\"."));
2668 add_com ("whereis", class_vars, whereis_command,
2669 _("Print line number and file of definition of variable."));
2672 add_info ("display", info_display_command, _("\
2673 Expressions to display when program stops, with code numbers."));
2675 add_cmd ("undisplay", class_vars, undisplay_command, _("\
2676 Cancel some expressions to be displayed when program stops.\n\
2677 Arguments are the code numbers of the expressions to stop displaying.\n\
2678 No argument means cancel all automatic-display expressions.\n\
2679 \"delete display\" has the same effect as this command.\n\
2680 Do \"info display\" to see current list of code numbers."),
2683 add_com ("display", class_vars, display_command, _("\
2684 Print value of expression EXP each time the program stops.\n\
2685 /FMT may be used before EXP as in the \"print\" command.\n\
2686 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2687 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2688 and examining is done as in the \"x\" command.\n\n\
2689 With no argument, display all currently requested auto-display expressions.\n\
2690 Use \"undisplay\" to cancel display requests previously made."));
2692 add_cmd ("display", class_vars, enable_display_command, _("\
2693 Enable some expressions to be displayed when program stops.\n\
2694 Arguments are the code numbers of the expressions to resume displaying.\n\
2695 No argument means enable all automatic-display expressions.\n\
2696 Do \"info display\" to see current list of code numbers."), &enablelist);
2698 add_cmd ("display", class_vars, disable_display_command, _("\
2699 Disable some expressions to be displayed when program stops.\n\
2700 Arguments are the code numbers of the expressions to stop displaying.\n\
2701 No argument means disable all automatic-display expressions.\n\
2702 Do \"info display\" to see current list of code numbers."), &disablelist);
2704 add_cmd ("display", class_vars, undisplay_command, _("\
2705 Cancel some expressions to be displayed when program stops.\n\
2706 Arguments are the code numbers of the expressions to stop displaying.\n\
2707 No argument means cancel all automatic-display expressions.\n\
2708 Do \"info display\" to see current list of code numbers."), &deletelist);
2710 add_com ("printf", class_vars, printf_command, _("\
2711 Formatted printing, like the C \"printf\" function.\n\
2712 Usage: printf \"format string\", arg1, arg2, arg3, ..., argn\n\
2713 This supports most C printf format specifications, like %s, %d, etc."));
2715 add_com ("output", class_vars, output_command, _("\
2716 Like \"print\" but don't put in value history and don't print newline.\n\
2717 This is useful in user-defined commands."));
2719 add_prefix_cmd ("set", class_vars, set_command, _("\
2720 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2721 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2722 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2723 with $), a register (a few standard names starting with $), or an actual\n\
2724 variable in the program being debugged. EXP is any valid expression.\n\
2725 Use \"set variable\" for variables with names identical to set subcommands.\n\
2727 With a subcommand, this command modifies parts of the gdb environment.\n\
2728 You can see these environment settings with the \"show\" command."),
2729 &setlist, "set ", 1, &cmdlist);
2731 add_com ("assign", class_vars, set_command, _("\
2732 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2733 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2734 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2735 with $), a register (a few standard names starting with $), or an actual\n\
2736 variable in the program being debugged. EXP is any valid expression.\n\
2737 Use \"set variable\" for variables with names identical to set subcommands.\n\
2738 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2739 You can see these environment settings with the \"show\" command."));
2741 /* "call" is the same as "set", but handy for dbx users to call fns. */
2742 c = add_com ("call", class_vars, call_command, _("\
2743 Call a function in the program.\n\
2744 The argument is the function name and arguments, in the notation of the\n\
2745 current working language. The result is printed and saved in the value\n\
2746 history, if it is not void."));
2747 set_cmd_completer (c, expression_completer);
2749 add_cmd ("variable", 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 This may usually be abbreviated to simply \"set\"."),
2757 add_alias_cmd ("var", "variable", class_vars, 0, &setlist);
2759 c = add_com ("print", class_vars, print_command, _("\
2760 Print value of expression EXP.\n\
2761 Variables accessible are those of the lexical environment of the selected\n\
2762 stack frame, plus all those whose scope is global or an entire file.\n\
2764 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2765 $$NUM refers to NUM'th value back from the last one.\n\
2766 Names starting with $ refer to registers (with the values they would have\n\
2767 if the program were to return to the stack frame now selected, restoring\n\
2768 all registers saved by frames farther in) or else to debugger\n\
2769 \"convenience\" variables (any such name not a known register).\n\
2770 Use assignment expressions to give values to convenience variables.\n\
2772 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2773 @ is a binary operator for treating consecutive data objects\n\
2774 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2775 element is FOO, whose second element is stored in the space following\n\
2776 where FOO is stored, etc. FOO must be an expression whose value\n\
2777 resides in memory.\n\
2779 EXP may be preceded with /FMT, where FMT is a format letter\n\
2780 but no count or size letter (see \"x\" command)."));
2781 set_cmd_completer (c, expression_completer);
2782 add_com_alias ("p", "print", class_vars, 1);
2783 add_com_alias ("inspect", "print", class_vars, 1);
2785 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class,
2786 &max_symbolic_offset, _("\
2787 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2788 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2789 Tell GDB to only display the symbolic form of an address if the\n\
2790 offset between the closest earlier symbol and the address is less than\n\
2791 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2792 to always print the symbolic form of an address if any symbol precedes\n\
2793 it. Zero is equivalent to \"unlimited\"."),
2795 show_max_symbolic_offset,
2796 &setprintlist, &showprintlist);
2797 add_setshow_boolean_cmd ("symbol-filename", no_class,
2798 &print_symbol_filename, _("\
2799 Set printing of source filename and line number with <symbol>."), _("\
2800 Show printing of source filename and line number with <symbol>."), NULL,
2802 show_print_symbol_filename,
2803 &setprintlist, &showprintlist);
2805 add_com ("eval", no_class, eval_command, _("\
2806 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2807 a command line, and call it."));