1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "expression.h"
30 #include "breakpoint.h"
32 #include "gdb-demangle.h"
35 #include "symfile.h" /* for overlay functions */
36 #include "objfiles.h" /* ditto */
37 #include "completer.h" /* for completion functions */
44 #include "parser-defs.h"
46 #include "arch-utils.h"
47 #include "cli/cli-utils.h"
48 #include "cli/cli-script.h"
51 #include "common/byte-vector.h"
54 #include "tui/tui.h" /* For tui_active et al. */
57 /* Last specified output format. */
59 static char last_format = 0;
61 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
63 static char last_size = 'w';
65 /* Default address to examine next, and associated architecture. */
67 static struct gdbarch *next_gdbarch;
68 static CORE_ADDR next_address;
70 /* Number of delay instructions following current disassembled insn. */
72 static int branch_delay_insns;
74 /* Last address examined. */
76 static CORE_ADDR last_examine_address;
78 /* Contents of last address examined.
79 This is not valid past the end of the `x' command! */
81 static struct value *last_examine_value;
83 /* Largest offset between a symbolic value and an address, that will be
84 printed as `0x1234 <symbol+offset>'. */
86 static unsigned int max_symbolic_offset = UINT_MAX;
88 show_max_symbolic_offset (struct ui_file *file, int from_tty,
89 struct cmd_list_element *c, const char *value)
91 fprintf_filtered (file,
92 _("The largest offset that will be "
93 "printed in <symbol+1234> form is %s.\n"),
97 /* Append the source filename and linenumber of the symbol when
98 printing a symbolic value as `<symbol at filename:linenum>' if set. */
99 static int print_symbol_filename = 0;
101 show_print_symbol_filename (struct ui_file *file, int from_tty,
102 struct cmd_list_element *c, const char *value)
104 fprintf_filtered (file, _("Printing of source filename and "
105 "line number with <symbol> is %s.\n"),
109 /* Number of auto-display expression currently being displayed.
110 So that we can disable it if we get a signal within it.
111 -1 when not doing one. */
113 static int current_display_number;
117 /* Chain link to next auto-display item. */
118 struct display *next;
120 /* The expression as the user typed it. */
123 /* Expression to be evaluated and displayed. */
126 /* Item number of this auto-display item. */
129 /* Display format specified. */
130 struct format_data format;
132 /* Program space associated with `block'. */
133 struct program_space *pspace;
135 /* Innermost block required by this expression when evaluated. */
136 const struct block *block;
138 /* Status of this display (enabled or disabled). */
142 /* Chain of expressions whose values should be displayed
143 automatically each time the program stops. */
145 static struct display *display_chain;
147 static int display_number;
149 /* Walk the following statement or block through all displays.
150 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
153 #define ALL_DISPLAYS(B) \
154 for (B = display_chain; B; B = B->next)
156 #define ALL_DISPLAYS_SAFE(B,TMP) \
157 for (B = display_chain; \
158 B ? (TMP = B->next, 1): 0; \
161 /* Prototypes for 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 if (last_examine_value)
1097 value_free (last_examine_value);
1099 /* The value to be displayed is not fetched greedily.
1100 Instead, to avoid the possibility of a fetched value not
1101 being used, its retrieval is delayed until the print code
1102 uses it. When examining an instruction stream, the
1103 disassembler will perform its own memory fetch using just
1104 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
1105 the disassembler be modified so that LAST_EXAMINE_VALUE
1106 is left with the byte sequence from the last complete
1107 instruction fetched from memory? */
1108 last_examine_value = value_at_lazy (val_type, next_address);
1110 if (last_examine_value)
1111 release_value (last_examine_value);
1113 print_formatted (last_examine_value, size, &opts, gdb_stdout);
1115 /* Display any branch delay slots following the final insn. */
1116 if (format == 'i' && count == 1)
1117 count += branch_delay_insns;
1119 printf_filtered ("\n");
1120 gdb_flush (gdb_stdout);
1123 if (need_to_update_next_address)
1124 next_address = addr_rewound;
1128 validate_format (struct format_data fmt, const char *cmdname)
1131 error (_("Size letters are meaningless in \"%s\" command."), cmdname);
1133 error (_("Item count other than 1 is meaningless in \"%s\" command."),
1135 if (fmt.format == 'i')
1136 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
1137 fmt.format, cmdname);
1140 /* Parse print command format string into *FMTP and update *EXPP.
1141 CMDNAME should name the current command. */
1144 print_command_parse_format (const char **expp, const char *cmdname,
1145 struct format_data *fmtp)
1147 const char *exp = *expp;
1149 if (exp && *exp == '/')
1152 *fmtp = decode_format (&exp, last_format, 0);
1153 validate_format (*fmtp, cmdname);
1154 last_format = fmtp->format;
1167 /* Print VAL to console according to *FMTP, including recording it to
1171 print_value (struct value *val, const struct format_data *fmtp)
1173 struct value_print_options opts;
1174 int histindex = record_latest_value (val);
1176 annotate_value_history_begin (histindex, value_type (val));
1178 printf_filtered ("$%d = ", histindex);
1180 annotate_value_history_value ();
1182 get_formatted_print_options (&opts, fmtp->format);
1183 opts.raw = fmtp->raw;
1185 print_formatted (val, fmtp->size, &opts, gdb_stdout);
1186 printf_filtered ("\n");
1188 annotate_value_history_end ();
1191 /* Evaluate string EXP as an expression in the current language and
1192 print the resulting value. EXP may contain a format specifier as the
1193 first argument ("/x myvar" for example, to print myvar in hex). */
1196 print_command_1 (const char *exp, int voidprint)
1199 struct format_data fmt;
1201 print_command_parse_format (&exp, "print", &fmt);
1205 expression_up expr = parse_expression (exp);
1206 val = evaluate_expression (expr.get ());
1209 val = access_value_history (0);
1211 if (voidprint || (val && value_type (val) &&
1212 TYPE_CODE (value_type (val)) != TYPE_CODE_VOID))
1213 print_value (val, &fmt);
1217 print_command (char *exp, int from_tty)
1219 print_command_1 (exp, 1);
1222 /* Same as print, except it doesn't print void results. */
1224 call_command (char *exp, int from_tty)
1226 print_command_1 (exp, 0);
1229 /* Implementation of the "output" command. */
1232 output_command (char *exp, int from_tty)
1234 output_command_const (exp, from_tty);
1237 /* Like output_command, but takes a const string as argument. */
1240 output_command_const (const char *exp, int from_tty)
1244 struct format_data fmt;
1245 struct value_print_options opts;
1250 if (exp && *exp == '/')
1253 fmt = decode_format (&exp, 0, 0);
1254 validate_format (fmt, "output");
1255 format = fmt.format;
1258 expression_up expr = parse_expression (exp);
1260 val = evaluate_expression (expr.get ());
1262 annotate_value_begin (value_type (val));
1264 get_formatted_print_options (&opts, format);
1266 print_formatted (val, fmt.size, &opts, gdb_stdout);
1268 annotate_value_end ();
1271 gdb_flush (gdb_stdout);
1275 set_command (const char *exp, int from_tty)
1277 expression_up expr = parse_expression (exp);
1279 if (expr->nelts >= 1)
1280 switch (expr->elts[0].opcode)
1282 case UNOP_PREINCREMENT:
1283 case UNOP_POSTINCREMENT:
1284 case UNOP_PREDECREMENT:
1285 case UNOP_POSTDECREMENT:
1287 case BINOP_ASSIGN_MODIFY:
1292 (_("Expression is not an assignment (and might have no effect)"));
1295 evaluate_expression (expr.get ());
1298 /* Temporary non-const version of set_command. */
1301 non_const_set_command (char *exp, int from_tty)
1303 set_command (exp, from_tty);
1307 info_symbol_command (char *arg, int from_tty)
1309 struct minimal_symbol *msymbol;
1310 struct objfile *objfile;
1311 struct obj_section *osect;
1312 CORE_ADDR addr, sect_addr;
1314 unsigned int offset;
1317 error_no_arg (_("address"));
1319 addr = parse_and_eval_address (arg);
1320 ALL_OBJSECTIONS (objfile, osect)
1322 /* Only process each object file once, even if there's a separate
1324 if (objfile->separate_debug_objfile_backlink)
1327 sect_addr = overlay_mapped_address (addr, osect);
1329 if (obj_section_addr (osect) <= sect_addr
1330 && sect_addr < obj_section_endaddr (osect)
1332 = lookup_minimal_symbol_by_pc_section (sect_addr, osect).minsym))
1334 const char *obj_name, *mapped, *sec_name, *msym_name;
1335 const char *loc_string;
1336 struct cleanup *old_chain;
1339 offset = sect_addr - MSYMBOL_VALUE_ADDRESS (objfile, msymbol);
1340 mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped");
1341 sec_name = osect->the_bfd_section->name;
1342 msym_name = MSYMBOL_PRINT_NAME (msymbol);
1344 /* Don't print the offset if it is zero.
1345 We assume there's no need to handle i18n of "sym + offset". */
1346 std::string string_holder;
1349 string_holder = string_printf ("%s + %u", msym_name, offset);
1350 loc_string = string_holder.c_str ();
1353 loc_string = msym_name;
1355 gdb_assert (osect->objfile && objfile_name (osect->objfile));
1356 obj_name = objfile_name (osect->objfile);
1358 if (MULTI_OBJFILE_P ())
1359 if (pc_in_unmapped_range (addr, osect))
1360 if (section_is_overlay (osect))
1361 printf_filtered (_("%s in load address range of "
1362 "%s overlay section %s of %s\n"),
1363 loc_string, mapped, sec_name, obj_name);
1365 printf_filtered (_("%s in load address range of "
1366 "section %s of %s\n"),
1367 loc_string, sec_name, obj_name);
1369 if (section_is_overlay (osect))
1370 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1371 loc_string, mapped, sec_name, obj_name);
1373 printf_filtered (_("%s in section %s of %s\n"),
1374 loc_string, sec_name, obj_name);
1376 if (pc_in_unmapped_range (addr, osect))
1377 if (section_is_overlay (osect))
1378 printf_filtered (_("%s in load address range of %s overlay "
1380 loc_string, mapped, sec_name);
1382 printf_filtered (_("%s in load address range of section %s\n"),
1383 loc_string, sec_name);
1385 if (section_is_overlay (osect))
1386 printf_filtered (_("%s in %s overlay section %s\n"),
1387 loc_string, mapped, sec_name);
1389 printf_filtered (_("%s in section %s\n"),
1390 loc_string, sec_name);
1394 printf_filtered (_("No symbol matches %s.\n"), arg);
1398 info_address_command (char *exp, int from_tty)
1400 struct gdbarch *gdbarch;
1403 struct bound_minimal_symbol msymbol;
1405 struct obj_section *section;
1406 CORE_ADDR load_addr, context_pc = 0;
1407 struct field_of_this_result is_a_field_of_this;
1410 error (_("Argument required."));
1412 sym = lookup_symbol (exp, get_selected_block (&context_pc), VAR_DOMAIN,
1413 &is_a_field_of_this).symbol;
1416 if (is_a_field_of_this.type != NULL)
1418 printf_filtered ("Symbol \"");
1419 fprintf_symbol_filtered (gdb_stdout, exp,
1420 current_language->la_language, DMGL_ANSI);
1421 printf_filtered ("\" is a field of the local class variable ");
1422 if (current_language->la_language == language_objc)
1423 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1425 printf_filtered ("`this'\n");
1429 msymbol = lookup_bound_minimal_symbol (exp);
1431 if (msymbol.minsym != NULL)
1433 struct objfile *objfile = msymbol.objfile;
1435 gdbarch = get_objfile_arch (objfile);
1436 load_addr = BMSYMBOL_VALUE_ADDRESS (msymbol);
1438 printf_filtered ("Symbol \"");
1439 fprintf_symbol_filtered (gdb_stdout, exp,
1440 current_language->la_language, DMGL_ANSI);
1441 printf_filtered ("\" is at ");
1442 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1443 printf_filtered (" in a file compiled without debugging");
1444 section = MSYMBOL_OBJ_SECTION (objfile, msymbol.minsym);
1445 if (section_is_overlay (section))
1447 load_addr = overlay_unmapped_address (load_addr, section);
1448 printf_filtered (",\n -- loaded at ");
1449 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1450 printf_filtered (" in overlay section %s",
1451 section->the_bfd_section->name);
1453 printf_filtered (".\n");
1456 error (_("No symbol \"%s\" in current context."), exp);
1460 printf_filtered ("Symbol \"");
1461 fprintf_symbol_filtered (gdb_stdout, SYMBOL_PRINT_NAME (sym),
1462 current_language->la_language, DMGL_ANSI);
1463 printf_filtered ("\" is ");
1464 val = SYMBOL_VALUE (sym);
1465 if (SYMBOL_OBJFILE_OWNED (sym))
1466 section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym);
1469 gdbarch = symbol_arch (sym);
1471 if (SYMBOL_COMPUTED_OPS (sym) != NULL)
1473 SYMBOL_COMPUTED_OPS (sym)->describe_location (sym, context_pc,
1475 printf_filtered (".\n");
1479 switch (SYMBOL_CLASS (sym))
1482 case LOC_CONST_BYTES:
1483 printf_filtered ("constant");
1487 printf_filtered ("a label at address ");
1488 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1489 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1490 if (section_is_overlay (section))
1492 load_addr = overlay_unmapped_address (load_addr, section);
1493 printf_filtered (",\n -- loaded at ");
1494 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1495 printf_filtered (" in overlay section %s",
1496 section->the_bfd_section->name);
1501 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1504 /* GDBARCH is the architecture associated with the objfile the symbol
1505 is defined in; the target architecture may be different, and may
1506 provide additional registers. However, we do not know the target
1507 architecture at this point. We assume the objfile architecture
1508 will contain all the standard registers that occur in debug info
1510 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1512 if (SYMBOL_IS_ARGUMENT (sym))
1513 printf_filtered (_("an argument in register %s"),
1514 gdbarch_register_name (gdbarch, regno));
1516 printf_filtered (_("a variable in register %s"),
1517 gdbarch_register_name (gdbarch, regno));
1521 printf_filtered (_("static storage at address "));
1522 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1523 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1524 if (section_is_overlay (section))
1526 load_addr = overlay_unmapped_address (load_addr, section);
1527 printf_filtered (_(",\n -- loaded at "));
1528 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1529 printf_filtered (_(" in overlay section %s"),
1530 section->the_bfd_section->name);
1534 case LOC_REGPARM_ADDR:
1535 /* Note comment at LOC_REGISTER. */
1536 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1537 printf_filtered (_("address of an argument in register %s"),
1538 gdbarch_register_name (gdbarch, regno));
1542 printf_filtered (_("an argument at offset %ld"), val);
1546 printf_filtered (_("a local variable at frame offset %ld"), val);
1550 printf_filtered (_("a reference argument at offset %ld"), val);
1554 printf_filtered (_("a typedef"));
1558 printf_filtered (_("a function at address "));
1559 load_addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
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);
1571 case LOC_UNRESOLVED:
1573 struct bound_minimal_symbol msym;
1575 msym = lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym));
1576 if (msym.minsym == NULL)
1577 printf_filtered ("unresolved");
1580 section = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym);
1583 && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
1585 load_addr = MSYMBOL_VALUE_RAW_ADDRESS (msym.minsym);
1586 printf_filtered (_("a thread-local variable at offset %s "
1587 "in the thread-local storage for `%s'"),
1588 paddress (gdbarch, load_addr),
1589 objfile_name (section->objfile));
1593 load_addr = BMSYMBOL_VALUE_ADDRESS (msym);
1594 printf_filtered (_("static storage at address "));
1595 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1596 if (section_is_overlay (section))
1598 load_addr = overlay_unmapped_address (load_addr, section);
1599 printf_filtered (_(",\n -- loaded at "));
1600 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1601 printf_filtered (_(" in overlay section %s"),
1602 section->the_bfd_section->name);
1609 case LOC_OPTIMIZED_OUT:
1610 printf_filtered (_("optimized out"));
1614 printf_filtered (_("of unknown (botched) type"));
1617 printf_filtered (".\n");
1622 x_command (char *exp, int from_tty)
1624 struct format_data fmt;
1627 fmt.format = last_format ? last_format : 'x';
1628 fmt.size = last_size;
1632 if (exp && *exp == '/')
1634 const char *tmp = exp + 1;
1636 fmt = decode_format (&tmp, last_format, last_size);
1640 /* If we have an expression, evaluate it and use it as the address. */
1642 if (exp != 0 && *exp != 0)
1644 expression_up expr = parse_expression (exp);
1645 /* Cause expression not to be there any more if this command is
1646 repeated with Newline. But don't clobber a user-defined
1647 command's definition. */
1650 val = evaluate_expression (expr.get ());
1651 if (TYPE_IS_REFERENCE (value_type (val)))
1652 val = coerce_ref (val);
1653 /* In rvalue contexts, such as this, functions are coerced into
1654 pointers to functions. This makes "x/i main" work. */
1655 if (/* last_format == 'i' && */
1656 TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC
1657 && VALUE_LVAL (val) == lval_memory)
1658 next_address = value_address (val);
1660 next_address = value_as_address (val);
1662 next_gdbarch = expr->gdbarch;
1666 error_no_arg (_("starting display address"));
1668 do_examine (fmt, next_gdbarch, next_address);
1670 /* If the examine succeeds, we remember its size and format for next
1671 time. Set last_size to 'b' for strings. */
1672 if (fmt.format == 's')
1675 last_size = fmt.size;
1676 last_format = fmt.format;
1678 /* Set a couple of internal variables if appropriate. */
1679 if (last_examine_value)
1681 /* Make last address examined available to the user as $_. Use
1682 the correct pointer type. */
1683 struct type *pointer_type
1684 = lookup_pointer_type (value_type (last_examine_value));
1685 set_internalvar (lookup_internalvar ("_"),
1686 value_from_pointer (pointer_type,
1687 last_examine_address));
1689 /* Make contents of last address examined available to the user
1690 as $__. If the last value has not been fetched from memory
1691 then don't fetch it now; instead mark it by voiding the $__
1693 if (value_lazy (last_examine_value))
1694 clear_internalvar (lookup_internalvar ("__"));
1696 set_internalvar (lookup_internalvar ("__"), last_examine_value);
1701 /* Add an expression to the auto-display chain.
1702 Specify the expression. */
1705 display_command (char *arg, int from_tty)
1707 struct format_data fmt;
1708 struct display *newobj;
1709 const char *exp = arg;
1720 fmt = decode_format (&exp, 0, 0);
1721 if (fmt.size && fmt.format == 0)
1723 if (fmt.format == 'i' || fmt.format == 's')
1734 innermost_block = NULL;
1735 expression_up expr = parse_expression (exp);
1737 newobj = new display ();
1739 newobj->exp_string = xstrdup (exp);
1740 newobj->exp = std::move (expr);
1741 newobj->block = innermost_block;
1742 newobj->pspace = current_program_space;
1743 newobj->number = ++display_number;
1744 newobj->format = fmt;
1745 newobj->enabled_p = 1;
1746 newobj->next = NULL;
1748 if (display_chain == NULL)
1749 display_chain = newobj;
1752 struct display *last;
1754 for (last = display_chain; last->next != NULL; last = last->next)
1756 last->next = newobj;
1760 do_one_display (newobj);
1766 free_display (struct display *d)
1768 xfree (d->exp_string);
1772 /* Clear out the display_chain. Done when new symtabs are loaded,
1773 since this invalidates the types stored in many expressions. */
1776 clear_displays (void)
1780 while ((d = display_chain) != NULL)
1782 display_chain = d->next;
1787 /* Delete the auto-display DISPLAY. */
1790 delete_display (struct display *display)
1794 gdb_assert (display != NULL);
1796 if (display_chain == display)
1797 display_chain = display->next;
1800 if (d->next == display)
1802 d->next = display->next;
1806 free_display (display);
1809 /* Call FUNCTION on each of the displays whose numbers are given in
1810 ARGS. DATA is passed unmodified to FUNCTION. */
1813 map_display_numbers (const char *args,
1814 void (*function) (struct display *,
1821 error_no_arg (_("one or more display numbers"));
1823 number_or_range_parser parser (args);
1825 while (!parser.finished ())
1827 const char *p = parser.cur_tok ();
1829 num = parser.get_number ();
1831 warning (_("bad display number at or near '%s'"), p);
1834 struct display *d, *tmp;
1836 ALL_DISPLAYS_SAFE (d, tmp)
1837 if (d->number == num)
1840 printf_unfiltered (_("No display number %d.\n"), num);
1847 /* Callback for map_display_numbers, that deletes a display. */
1850 do_delete_display (struct display *d, void *data)
1855 /* "undisplay" command. */
1858 undisplay_command (const char *args, int from_tty)
1862 if (query (_("Delete all auto-display expressions? ")))
1868 map_display_numbers (args, do_delete_display, NULL);
1872 /* Display a single auto-display.
1873 Do nothing if the display cannot be printed in the current context,
1874 or if the display is disabled. */
1877 do_one_display (struct display *d)
1879 int within_current_scope;
1881 if (d->enabled_p == 0)
1884 /* The expression carries the architecture that was used at parse time.
1885 This is a problem if the expression depends on architecture features
1886 (e.g. register numbers), and the current architecture is now different.
1887 For example, a display statement like "display/i $pc" is expected to
1888 display the PC register of the current architecture, not the arch at
1889 the time the display command was given. Therefore, we re-parse the
1890 expression if the current architecture has changed. */
1891 if (d->exp != NULL && d->exp->gdbarch != get_current_arch ())
1902 innermost_block = NULL;
1903 d->exp = parse_expression (d->exp_string);
1904 d->block = innermost_block;
1906 CATCH (ex, RETURN_MASK_ALL)
1908 /* Can't re-parse the expression. Disable this display item. */
1910 warning (_("Unable to display \"%s\": %s"),
1911 d->exp_string, ex.message);
1919 if (d->pspace == current_program_space)
1920 within_current_scope = contained_in (get_selected_block (0), d->block);
1922 within_current_scope = 0;
1925 within_current_scope = 1;
1926 if (!within_current_scope)
1929 scoped_restore save_display_number
1930 = make_scoped_restore (¤t_display_number, d->number);
1932 annotate_display_begin ();
1933 printf_filtered ("%d", d->number);
1934 annotate_display_number_end ();
1935 printf_filtered (": ");
1939 annotate_display_format ();
1941 printf_filtered ("x/");
1942 if (d->format.count != 1)
1943 printf_filtered ("%d", d->format.count);
1944 printf_filtered ("%c", d->format.format);
1945 if (d->format.format != 'i' && d->format.format != 's')
1946 printf_filtered ("%c", d->format.size);
1947 printf_filtered (" ");
1949 annotate_display_expression ();
1951 puts_filtered (d->exp_string);
1952 annotate_display_expression_end ();
1954 if (d->format.count != 1 || d->format.format == 'i')
1955 printf_filtered ("\n");
1957 printf_filtered (" ");
1959 annotate_display_value ();
1966 val = evaluate_expression (d->exp.get ());
1967 addr = value_as_address (val);
1968 if (d->format.format == 'i')
1969 addr = gdbarch_addr_bits_remove (d->exp->gdbarch, addr);
1970 do_examine (d->format, d->exp->gdbarch, addr);
1972 CATCH (ex, RETURN_MASK_ERROR)
1974 fprintf_filtered (gdb_stdout, _("<error: %s>\n"), ex.message);
1980 struct value_print_options opts;
1982 annotate_display_format ();
1984 if (d->format.format)
1985 printf_filtered ("/%c ", d->format.format);
1987 annotate_display_expression ();
1989 puts_filtered (d->exp_string);
1990 annotate_display_expression_end ();
1992 printf_filtered (" = ");
1994 annotate_display_expression ();
1996 get_formatted_print_options (&opts, d->format.format);
1997 opts.raw = d->format.raw;
2003 val = evaluate_expression (d->exp.get ());
2004 print_formatted (val, d->format.size, &opts, gdb_stdout);
2006 CATCH (ex, RETURN_MASK_ERROR)
2008 fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message);
2012 printf_filtered ("\n");
2015 annotate_display_end ();
2017 gdb_flush (gdb_stdout);
2020 /* Display all of the values on the auto-display chain which can be
2021 evaluated in the current scope. */
2028 for (d = display_chain; d; d = d->next)
2032 /* Delete the auto-display which we were in the process of displaying.
2033 This is done when there is an error or a signal. */
2036 disable_display (int num)
2040 for (d = display_chain; d; d = d->next)
2041 if (d->number == num)
2046 printf_unfiltered (_("No display number %d.\n"), num);
2050 disable_current_display (void)
2052 if (current_display_number >= 0)
2054 disable_display (current_display_number);
2055 fprintf_unfiltered (gdb_stderr,
2056 _("Disabling display %d to "
2057 "avoid infinite recursion.\n"),
2058 current_display_number);
2060 current_display_number = -1;
2064 info_display_command (char *ignore, int from_tty)
2069 printf_unfiltered (_("There are no auto-display expressions now.\n"));
2071 printf_filtered (_("Auto-display expressions now in effect:\n\
2072 Num Enb Expression\n"));
2074 for (d = display_chain; d; d = d->next)
2076 printf_filtered ("%d: %c ", d->number, "ny"[(int) d->enabled_p]);
2078 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
2080 else if (d->format.format)
2081 printf_filtered ("/%c ", d->format.format);
2082 puts_filtered (d->exp_string);
2083 if (d->block && !contained_in (get_selected_block (0), d->block))
2084 printf_filtered (_(" (cannot be evaluated in the current context)"));
2085 printf_filtered ("\n");
2086 gdb_flush (gdb_stdout);
2090 /* Callback fo map_display_numbers, that enables or disables the
2091 passed in display D. */
2094 do_enable_disable_display (struct display *d, void *data)
2096 d->enabled_p = *(int *) data;
2099 /* Implamentation of both the "disable display" and "enable display"
2100 commands. ENABLE decides what to do. */
2103 enable_disable_display_command (const char *args, int from_tty, int enable)
2110 d->enabled_p = enable;
2114 map_display_numbers (args, do_enable_disable_display, &enable);
2117 /* The "enable display" command. */
2120 enable_display_command (const char *args, int from_tty)
2122 enable_disable_display_command (args, from_tty, 1);
2125 /* The "disable display" command. */
2128 disable_display_command (const char *args, int from_tty)
2130 enable_disable_display_command (args, from_tty, 0);
2133 /* display_chain items point to blocks and expressions. Some expressions in
2134 turn may point to symbols.
2135 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
2136 obstack_free'd when a shared library is unloaded.
2137 Clear pointers that are about to become dangling.
2138 Both .exp and .block fields will be restored next time we need to display
2139 an item by re-parsing .exp_string field in the new execution context. */
2142 clear_dangling_display_expressions (struct objfile *objfile)
2145 struct program_space *pspace;
2147 /* With no symbol file we cannot have a block or expression from it. */
2148 if (objfile == NULL)
2150 pspace = objfile->pspace;
2151 if (objfile->separate_debug_objfile_backlink)
2153 objfile = objfile->separate_debug_objfile_backlink;
2154 gdb_assert (objfile->pspace == pspace);
2157 for (d = display_chain; d != NULL; d = d->next)
2159 if (d->pspace != pspace)
2162 if (lookup_objfile_from_block (d->block) == objfile
2163 || (d->exp != NULL && exp_uses_objfile (d->exp.get (), objfile)))
2172 /* Print the value in stack frame FRAME of a variable specified by a
2173 struct symbol. NAME is the name to print; if NULL then VAR's print
2174 name will be used. STREAM is the ui_file on which to print the
2175 value. INDENT specifies the number of indent levels to print
2176 before printing the variable name.
2178 This function invalidates FRAME. */
2181 print_variable_and_value (const char *name, struct symbol *var,
2182 struct frame_info *frame,
2183 struct ui_file *stream, int indent)
2187 name = SYMBOL_PRINT_NAME (var);
2189 fprintf_filtered (stream, "%s%s = ", n_spaces (2 * indent), name);
2193 struct value_print_options opts;
2195 /* READ_VAR_VALUE needs a block in order to deal with non-local
2196 references (i.e. to handle nested functions). In this context, we
2197 print variables that are local to this frame, so we can avoid passing
2199 val = read_var_value (var, NULL, frame);
2200 get_user_print_options (&opts);
2202 common_val_print (val, stream, indent, &opts, current_language);
2204 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2208 CATCH (except, RETURN_MASK_ERROR)
2210 fprintf_filtered(stream, "<error reading variable %s (%s)>", name,
2215 fprintf_filtered (stream, "\n");
2218 /* Subroutine of ui_printf to simplify it.
2219 Print VALUE to STREAM using FORMAT.
2220 VALUE is a C-style string on the target. */
2223 printf_c_string (struct ui_file *stream, const char *format,
2224 struct value *value)
2230 tem = value_as_address (value);
2232 /* This is a %s argument. Find the length of the string. */
2238 read_memory (tem + j, &c, 1);
2243 /* Copy the string contents into a string inside GDB. */
2244 str = (gdb_byte *) alloca (j + 1);
2246 read_memory (tem, str, j);
2249 fprintf_filtered (stream, format, (char *) str);
2252 /* Subroutine of ui_printf to simplify it.
2253 Print VALUE to STREAM using FORMAT.
2254 VALUE is a wide C-style string on the target. */
2257 printf_wide_c_string (struct ui_file *stream, const char *format,
2258 struct value *value)
2263 struct gdbarch *gdbarch = get_type_arch (value_type (value));
2264 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2265 struct type *wctype = lookup_typename (current_language, gdbarch,
2266 "wchar_t", NULL, 0);
2267 int wcwidth = TYPE_LENGTH (wctype);
2268 gdb_byte *buf = (gdb_byte *) alloca (wcwidth);
2270 tem = value_as_address (value);
2272 /* This is a %s argument. Find the length of the string. */
2273 for (j = 0;; j += wcwidth)
2276 read_memory (tem + j, buf, wcwidth);
2277 if (extract_unsigned_integer (buf, wcwidth, byte_order) == 0)
2281 /* Copy the string contents into a string inside GDB. */
2282 str = (gdb_byte *) alloca (j + wcwidth);
2284 read_memory (tem, str, j);
2285 memset (&str[j], 0, wcwidth);
2287 auto_obstack output;
2289 convert_between_encodings (target_wide_charset (gdbarch),
2292 &output, translit_char);
2293 obstack_grow_str0 (&output, "");
2295 fprintf_filtered (stream, format, obstack_base (&output));
2298 /* Subroutine of ui_printf to simplify it.
2299 Print VALUE, a decimal floating point value, to STREAM using FORMAT. */
2302 printf_decfloat (struct ui_file *stream, const char *format,
2303 struct value *value)
2305 const gdb_byte *param_ptr = value_contents (value);
2307 #if defined (PRINTF_HAS_DECFLOAT)
2308 /* If we have native support for Decimal floating
2309 printing, handle it here. */
2310 fprintf_filtered (stream, format, param_ptr);
2312 /* As a workaround until vasprintf has native support for DFP
2313 we convert the DFP values to string and print them using
2314 the %s format specifier. */
2317 /* Parameter data. */
2318 struct type *param_type = value_type (value);
2319 struct gdbarch *gdbarch = get_type_arch (param_type);
2320 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2322 /* DFP output data. */
2323 struct value *dfp_value = NULL;
2327 struct type *dfp_type = NULL;
2329 /* Points to the end of the string so that we can go back
2330 and check for DFP length modifiers. */
2331 p = format + strlen (format);
2333 /* Look for the float/double format specifier. */
2334 while (*p != 'f' && *p != 'e' && *p != 'E'
2335 && *p != 'g' && *p != 'G')
2338 /* Search for the '%' char and extract the size and type of
2339 the output decimal value based on its modifiers
2340 (%Hf, %Df, %DDf). */
2346 dfp_type = builtin_type (gdbarch)->builtin_decfloat;
2348 else if (*p == 'D' && *(p - 1) == 'D')
2351 dfp_type = builtin_type (gdbarch)->builtin_declong;
2357 dfp_type = builtin_type (gdbarch)->builtin_decdouble;
2361 /* Conversion between different DFP types. */
2362 if (TYPE_CODE (param_type) == TYPE_CODE_DECFLOAT)
2363 decimal_convert (param_ptr, TYPE_LENGTH (param_type),
2364 byte_order, dec, dfp_len, byte_order);
2366 /* If this is a non-trivial conversion, just output 0.
2367 A correct converted value can be displayed by explicitly
2368 casting to a DFP type. */
2369 decimal_from_string (dec, dfp_len, byte_order, "0");
2371 dfp_value = value_from_decfloat (dfp_type, dec);
2373 dfp_ptr = (gdb_byte *) value_contents (dfp_value);
2375 /* Convert the value to a string and print it. */
2376 std::string str = decimal_to_string (dfp_ptr, dfp_len, byte_order);
2377 fputs_filtered (str.c_str (), stream);
2381 /* Subroutine of ui_printf to simplify it.
2382 Print VALUE, a target pointer, to STREAM using FORMAT. */
2385 printf_pointer (struct ui_file *stream, const char *format,
2386 struct value *value)
2388 /* We avoid the host's %p because pointers are too
2389 likely to be the wrong size. The only interesting
2390 modifier for %p is a width; extract that, and then
2391 handle %p as glibc would: %#x or a literal "(nil)". */
2395 #ifdef PRINTF_HAS_LONG_LONG
2396 long long val = value_as_long (value);
2398 long val = value_as_long (value);
2401 fmt = (char *) alloca (strlen (format) + 5);
2403 /* Copy up to the leading %. */
2408 int is_percent = (*p == '%');
2423 /* Copy any width. */
2424 while (*p >= '0' && *p < '9')
2427 gdb_assert (*p == 'p' && *(p + 1) == '\0');
2430 #ifdef PRINTF_HAS_LONG_LONG
2436 fprintf_filtered (stream, fmt, val);
2442 fprintf_filtered (stream, fmt, "(nil)");
2446 /* printf "printf format string" ARG to STREAM. */
2449 ui_printf (const char *arg, struct ui_file *stream)
2451 struct format_piece *fpieces;
2452 const char *s = arg;
2453 struct value **val_args;
2454 int allocated_args = 20;
2455 struct cleanup *old_cleanups;
2457 val_args = XNEWVEC (struct value *, allocated_args);
2458 old_cleanups = make_cleanup (free_current_contents, &val_args);
2461 error_no_arg (_("format-control string and values to print"));
2463 s = skip_spaces (s);
2465 /* A format string should follow, enveloped in double quotes. */
2467 error (_("Bad format string, missing '\"'."));
2469 fpieces = parse_format_string (&s);
2471 make_cleanup (free_format_pieces_cleanup, &fpieces);
2474 error (_("Bad format string, non-terminated '\"'."));
2476 s = skip_spaces (s);
2478 if (*s != ',' && *s != 0)
2479 error (_("Invalid argument syntax"));
2483 s = skip_spaces (s);
2489 char *current_substring;
2492 for (fr = 0; fpieces[fr].string != NULL; fr++)
2493 if (fpieces[fr].argclass != literal_piece)
2496 /* Now, parse all arguments and evaluate them.
2497 Store the VALUEs in VAL_ARGS. */
2503 if (nargs == allocated_args)
2504 val_args = (struct value **) xrealloc ((char *) val_args,
2505 (allocated_args *= 2)
2506 * sizeof (struct value *));
2508 val_args[nargs] = parse_to_comma_and_eval (&s1);
2516 if (nargs != nargs_wanted)
2517 error (_("Wrong number of arguments for specified format-string"));
2519 /* Now actually print them. */
2521 for (fr = 0; fpieces[fr].string != NULL; fr++)
2523 current_substring = fpieces[fr].string;
2524 switch (fpieces[fr].argclass)
2527 printf_c_string (stream, current_substring, val_args[i]);
2529 case wide_string_arg:
2530 printf_wide_c_string (stream, current_substring, val_args[i]);
2534 struct gdbarch *gdbarch
2535 = get_type_arch (value_type (val_args[i]));
2536 struct type *wctype = lookup_typename (current_language, gdbarch,
2537 "wchar_t", NULL, 0);
2538 struct type *valtype;
2539 const gdb_byte *bytes;
2541 valtype = value_type (val_args[i]);
2542 if (TYPE_LENGTH (valtype) != TYPE_LENGTH (wctype)
2543 || TYPE_CODE (valtype) != TYPE_CODE_INT)
2544 error (_("expected wchar_t argument for %%lc"));
2546 bytes = value_contents (val_args[i]);
2548 auto_obstack output;
2550 convert_between_encodings (target_wide_charset (gdbarch),
2552 bytes, TYPE_LENGTH (valtype),
2553 TYPE_LENGTH (valtype),
2554 &output, translit_char);
2555 obstack_grow_str0 (&output, "");
2557 fprintf_filtered (stream, current_substring,
2558 obstack_base (&output));
2563 struct type *type = value_type (val_args[i]);
2567 /* If format string wants a float, unchecked-convert the value
2568 to floating point of the same size. */
2569 type = float_type_from_length (type);
2570 val = unpack_double (type, value_contents (val_args[i]), &inv);
2572 error (_("Invalid floating value found in program."));
2574 fprintf_filtered (stream, current_substring, (double) val);
2577 case long_double_arg:
2578 #ifdef HAVE_LONG_DOUBLE
2580 struct type *type = value_type (val_args[i]);
2584 /* If format string wants a float, unchecked-convert the value
2585 to floating point of the same size. */
2586 type = float_type_from_length (type);
2587 val = unpack_double (type, value_contents (val_args[i]), &inv);
2589 error (_("Invalid floating value found in program."));
2591 fprintf_filtered (stream, current_substring,
2596 error (_("long double not supported in printf"));
2599 #ifdef PRINTF_HAS_LONG_LONG
2601 long long val = value_as_long (val_args[i]);
2603 fprintf_filtered (stream, current_substring, val);
2607 error (_("long long not supported in printf"));
2611 int val = value_as_long (val_args[i]);
2613 fprintf_filtered (stream, current_substring, val);
2618 long val = value_as_long (val_args[i]);
2620 fprintf_filtered (stream, current_substring, val);
2623 /* Handles decimal floating values. */
2625 printf_decfloat (stream, current_substring, val_args[i]);
2628 printf_pointer (stream, current_substring, val_args[i]);
2631 /* Print a portion of the format string that has no
2632 directives. Note that this will not include any
2633 ordinary %-specs, but it might include "%%". That is
2634 why we use printf_filtered and not puts_filtered here.
2635 Also, we pass a dummy argument because some platforms
2636 have modified GCC to include -Wformat-security by
2637 default, which will warn here if there is no
2639 fprintf_filtered (stream, current_substring, 0);
2642 internal_error (__FILE__, __LINE__,
2643 _("failed internal consistency check"));
2645 /* Maybe advance to the next argument. */
2646 if (fpieces[fr].argclass != literal_piece)
2650 do_cleanups (old_cleanups);
2653 /* Implement the "printf" command. */
2656 printf_command (char *arg, int from_tty)
2658 ui_printf (arg, gdb_stdout);
2659 gdb_flush (gdb_stdout);
2662 /* Implement the "eval" command. */
2665 eval_command (char *arg, int from_tty)
2669 ui_printf (arg, &stb);
2671 std::string expanded = insert_user_defined_cmd_args (stb.c_str ());
2673 execute_command (&expanded[0], from_tty);
2677 _initialize_printcmd (void)
2679 struct cmd_list_element *c;
2681 current_display_number = -1;
2683 observer_attach_free_objfile (clear_dangling_display_expressions);
2685 add_info ("address", info_address_command,
2686 _("Describe where symbol SYM is stored."));
2688 add_info ("symbol", info_symbol_command, _("\
2689 Describe what symbol is at location ADDR.\n\
2690 Only for symbols with fixed locations (global or static scope)."));
2692 add_com ("x", class_vars, x_command, _("\
2693 Examine memory: x/FMT ADDRESS.\n\
2694 ADDRESS is an expression for the memory address to examine.\n\
2695 FMT is a repeat count followed by a format letter and a size letter.\n\
2696 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2697 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2698 and z(hex, zero padded on the left).\n\
2699 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2700 The specified number of objects of the specified size are printed\n\
2701 according to the format. If a negative number is specified, memory is\n\
2702 examined backward from the address.\n\n\
2703 Defaults for format and size letters are those previously used.\n\
2704 Default count is 1. Default address is following last thing printed\n\
2705 with this command or \"print\"."));
2708 add_com ("whereis", class_vars, whereis_command,
2709 _("Print line number and file of definition of variable."));
2712 add_info ("display", info_display_command, _("\
2713 Expressions to display when program stops, with code numbers."));
2715 add_cmd ("undisplay", class_vars, undisplay_command, _("\
2716 Cancel some expressions to be displayed when program stops.\n\
2717 Arguments are the code numbers of the expressions to stop displaying.\n\
2718 No argument means cancel all automatic-display expressions.\n\
2719 \"delete display\" has the same effect as this command.\n\
2720 Do \"info display\" to see current list of code numbers."),
2723 add_com ("display", class_vars, display_command, _("\
2724 Print value of expression EXP each time the program stops.\n\
2725 /FMT may be used before EXP as in the \"print\" command.\n\
2726 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2727 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2728 and examining is done as in the \"x\" command.\n\n\
2729 With no argument, display all currently requested auto-display expressions.\n\
2730 Use \"undisplay\" to cancel display requests previously made."));
2732 add_cmd ("display", class_vars, enable_display_command, _("\
2733 Enable some expressions to be displayed when program stops.\n\
2734 Arguments are the code numbers of the expressions to resume displaying.\n\
2735 No argument means enable all automatic-display expressions.\n\
2736 Do \"info display\" to see current list of code numbers."), &enablelist);
2738 add_cmd ("display", class_vars, disable_display_command, _("\
2739 Disable some expressions to be displayed when program stops.\n\
2740 Arguments are the code numbers of the expressions to stop displaying.\n\
2741 No argument means disable all automatic-display expressions.\n\
2742 Do \"info display\" to see current list of code numbers."), &disablelist);
2744 add_cmd ("display", class_vars, undisplay_command, _("\
2745 Cancel some expressions to be displayed when program stops.\n\
2746 Arguments are the code numbers of the expressions to stop displaying.\n\
2747 No argument means cancel all automatic-display expressions.\n\
2748 Do \"info display\" to see current list of code numbers."), &deletelist);
2750 add_com ("printf", class_vars, printf_command, _("\
2751 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2752 This is useful for formatted output in user-defined commands."));
2754 add_com ("output", class_vars, output_command, _("\
2755 Like \"print\" but don't put in value history and don't print newline.\n\
2756 This is useful in user-defined commands."));
2758 add_prefix_cmd ("set", class_vars, set_command, _("\
2759 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2760 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2761 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2762 with $), a register (a few standard names starting with $), or an actual\n\
2763 variable in the program being debugged. EXP is any valid expression.\n\
2764 Use \"set variable\" for variables with names identical to set subcommands.\n\
2766 With a subcommand, this command modifies parts of the gdb environment.\n\
2767 You can see these environment settings with the \"show\" command."),
2768 &setlist, "set ", 1, &cmdlist);
2770 add_com ("assign", class_vars, non_const_set_command, _("\
2771 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2772 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2773 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2774 with $), a register (a few standard names starting with $), or an actual\n\
2775 variable in the program being debugged. EXP is any valid expression.\n\
2776 Use \"set variable\" for variables with names identical to set subcommands.\n\
2777 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2778 You can see these environment settings with the \"show\" command."));
2780 /* "call" is the same as "set", but handy for dbx users to call fns. */
2781 c = add_com ("call", class_vars, call_command, _("\
2782 Call a function in the program.\n\
2783 The argument is the function name and arguments, in the notation of the\n\
2784 current working language. The result is printed and saved in the value\n\
2785 history, if it is not void."));
2786 set_cmd_completer (c, expression_completer);
2788 add_cmd ("variable", class_vars, set_command, _("\
2789 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2790 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2791 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2792 with $), a register (a few standard names starting with $), or an actual\n\
2793 variable in the program being debugged. EXP is any valid expression.\n\
2794 This may usually be abbreviated to simply \"set\"."),
2797 c = add_com ("print", class_vars, print_command, _("\
2798 Print value of expression EXP.\n\
2799 Variables accessible are those of the lexical environment of the selected\n\
2800 stack frame, plus all those whose scope is global or an entire file.\n\
2802 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2803 $$NUM refers to NUM'th value back from the last one.\n\
2804 Names starting with $ refer to registers (with the values they would have\n\
2805 if the program were to return to the stack frame now selected, restoring\n\
2806 all registers saved by frames farther in) or else to debugger\n\
2807 \"convenience\" variables (any such name not a known register).\n\
2808 Use assignment expressions to give values to convenience variables.\n\
2810 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2811 @ is a binary operator for treating consecutive data objects\n\
2812 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2813 element is FOO, whose second element is stored in the space following\n\
2814 where FOO is stored, etc. FOO must be an expression whose value\n\
2815 resides in memory.\n\
2817 EXP may be preceded with /FMT, where FMT is a format letter\n\
2818 but no count or size letter (see \"x\" command)."));
2819 set_cmd_completer (c, expression_completer);
2820 add_com_alias ("p", "print", class_vars, 1);
2821 add_com_alias ("inspect", "print", class_vars, 1);
2823 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class,
2824 &max_symbolic_offset, _("\
2825 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2826 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2827 Tell GDB to only display the symbolic form of an address if the\n\
2828 offset between the closest earlier symbol and the address is less than\n\
2829 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2830 to always print the symbolic form of an address if any symbol precedes\n\
2831 it. Zero is equivalent to \"unlimited\"."),
2833 show_max_symbolic_offset,
2834 &setprintlist, &showprintlist);
2835 add_setshow_boolean_cmd ("symbol-filename", no_class,
2836 &print_symbol_filename, _("\
2837 Set printing of source filename and line number with <symbol>."), _("\
2838 Show printing of source filename and line number with <symbol>."), NULL,
2840 show_print_symbol_filename,
2841 &setprintlist, &showprintlist);
2843 add_com ("eval", no_class, eval_command, _("\
2844 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2845 a command line, and call it."));