1 /* Print values for GNU debugger GDB.
3 Copyright (C) 1986-2015 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"
52 #include "tui/tui.h" /* For tui_active et al. */
61 /* True if the value should be printed raw -- that is, bypassing
62 python-based formatters. */
66 /* Last specified output format. */
68 static char last_format = 0;
70 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
72 static char last_size = 'w';
74 /* Default address to examine next, and associated architecture. */
76 static struct gdbarch *next_gdbarch;
77 static CORE_ADDR next_address;
79 /* Number of delay instructions following current disassembled insn. */
81 static int branch_delay_insns;
83 /* Last address examined. */
85 static CORE_ADDR last_examine_address;
87 /* Contents of last address examined.
88 This is not valid past the end of the `x' command! */
90 static struct value *last_examine_value;
92 /* Largest offset between a symbolic value and an address, that will be
93 printed as `0x1234 <symbol+offset>'. */
95 static unsigned int max_symbolic_offset = UINT_MAX;
97 show_max_symbolic_offset (struct ui_file *file, int from_tty,
98 struct cmd_list_element *c, const char *value)
100 fprintf_filtered (file,
101 _("The largest offset that will be "
102 "printed in <symbol+1234> form is %s.\n"),
106 /* Append the source filename and linenumber of the symbol when
107 printing a symbolic value as `<symbol at filename:linenum>' if set. */
108 static int print_symbol_filename = 0;
110 show_print_symbol_filename (struct ui_file *file, int from_tty,
111 struct cmd_list_element *c, const char *value)
113 fprintf_filtered (file, _("Printing of source filename and "
114 "line number with <symbol> is %s.\n"),
118 /* Number of auto-display expression currently being displayed.
119 So that we can disable it if we get a signal within it.
120 -1 when not doing one. */
122 static int current_display_number;
126 /* Chain link to next auto-display item. */
127 struct display *next;
129 /* The expression as the user typed it. */
132 /* Expression to be evaluated and displayed. */
133 struct expression *exp;
135 /* Item number of this auto-display item. */
138 /* Display format specified. */
139 struct format_data format;
141 /* Program space associated with `block'. */
142 struct program_space *pspace;
144 /* Innermost block required by this expression when evaluated. */
145 const struct block *block;
147 /* Status of this display (enabled or disabled). */
151 /* Chain of expressions whose values should be displayed
152 automatically each time the program stops. */
154 static struct display *display_chain;
156 static int display_number;
158 /* Walk the following statement or block through all displays.
159 ALL_DISPLAYS_SAFE does so even if the statement deletes the current
162 #define ALL_DISPLAYS(B) \
163 for (B = display_chain; B; B = B->next)
165 #define ALL_DISPLAYS_SAFE(B,TMP) \
166 for (B = display_chain; \
167 B ? (TMP = B->next, 1): 0; \
170 /* Prototypes for exported functions. */
172 void _initialize_printcmd (void);
174 /* Prototypes for local functions. */
176 static void do_one_display (struct display *);
179 /* Decode a format specification. *STRING_PTR should point to it.
180 OFORMAT and OSIZE are used as defaults for the format and size
181 if none are given in the format specification.
182 If OSIZE is zero, then the size field of the returned value
183 should be set only if a size is explicitly specified by the
185 The structure returned describes all the data
186 found in the specification. In addition, *STRING_PTR is advanced
187 past the specification and past all whitespace following it. */
189 static struct format_data
190 decode_format (const char **string_ptr, int oformat, int osize)
192 struct format_data val;
193 const char *p = *string_ptr;
200 if (*p >= '0' && *p <= '9')
201 val.count = atoi (p);
202 while (*p >= '0' && *p <= '9')
205 /* Now process size or format letters that follow. */
209 if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g')
216 else if (*p >= 'a' && *p <= 'z')
222 while (*p == ' ' || *p == '\t')
226 /* Set defaults for format and size if not specified. */
227 if (val.format == '?')
231 /* Neither has been specified. */
232 val.format = oformat;
236 /* If a size is specified, any format makes a reasonable
237 default except 'i'. */
238 val.format = oformat == 'i' ? 'x' : oformat;
240 else if (val.size == '?')
244 /* Pick the appropriate size for an address. This is deferred
245 until do_examine when we know the actual architecture to use.
246 A special size value of 'a' is used to indicate this case. */
247 val.size = osize ? 'a' : osize;
250 /* Floating point has to be word or giantword. */
251 if (osize == 'w' || osize == 'g')
254 /* Default it to giantword if the last used size is not
256 val.size = osize ? 'g' : osize;
259 /* Characters default to one byte. */
260 val.size = osize ? 'b' : osize;
263 /* Display strings with byte size chars unless explicitly
269 /* The default is the size most recently specified. */
276 /* Print value VAL on stream according to OPTIONS.
277 Do not end with a newline.
278 SIZE is the letter for the size of datum being printed.
279 This is used to pad hex numbers so they line up. SIZE is 0
280 for print / output and set for examine. */
283 print_formatted (struct value *val, int size,
284 const struct value_print_options *options,
285 struct ui_file *stream)
287 struct type *type = check_typedef (value_type (val));
288 int len = TYPE_LENGTH (type);
290 if (VALUE_LVAL (val) == lval_memory)
291 next_address = value_address (val) + len;
295 switch (options->format)
299 struct type *elttype = value_type (val);
301 next_address = (value_address (val)
302 + val_print_string (elttype, NULL,
303 value_address (val), -1,
304 stream, options) * len);
309 /* We often wrap here if there are long symbolic names. */
311 next_address = (value_address (val)
312 + gdb_print_insn (get_type_arch (type),
313 value_address (val), stream,
314 &branch_delay_insns));
319 if (options->format == 0 || options->format == 's'
320 || TYPE_CODE (type) == TYPE_CODE_REF
321 || TYPE_CODE (type) == TYPE_CODE_ARRAY
322 || TYPE_CODE (type) == TYPE_CODE_STRING
323 || TYPE_CODE (type) == TYPE_CODE_STRUCT
324 || TYPE_CODE (type) == TYPE_CODE_UNION
325 || TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
326 value_print (val, stream, options);
328 /* User specified format, so don't look to the type to tell us
330 val_print_scalar_formatted (type,
331 value_contents_for_printing (val),
332 value_embedded_offset (val),
334 options, size, stream);
337 /* Return builtin floating point type of same length as TYPE.
338 If no such type is found, return TYPE itself. */
340 float_type_from_length (struct type *type)
342 struct gdbarch *gdbarch = get_type_arch (type);
343 const struct builtin_type *builtin = builtin_type (gdbarch);
345 if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_float))
346 type = builtin->builtin_float;
347 else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_double))
348 type = builtin->builtin_double;
349 else if (TYPE_LENGTH (type) == TYPE_LENGTH (builtin->builtin_long_double))
350 type = builtin->builtin_long_double;
355 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
356 according to OPTIONS and SIZE on STREAM. Formats s and i are not
357 supported at this level. */
360 print_scalar_formatted (const void *valaddr, struct type *type,
361 const struct value_print_options *options,
362 int size, struct ui_file *stream)
364 struct gdbarch *gdbarch = get_type_arch (type);
365 LONGEST val_long = 0;
366 unsigned int len = TYPE_LENGTH (type);
367 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
369 /* String printing should go through val_print_scalar_formatted. */
370 gdb_assert (options->format != 's');
372 if (len > sizeof(LONGEST) &&
373 (TYPE_CODE (type) == TYPE_CODE_INT
374 || TYPE_CODE (type) == TYPE_CODE_ENUM))
376 switch (options->format)
379 print_octal_chars (stream, valaddr, len, byte_order);
383 print_decimal_chars (stream, valaddr, len, byte_order);
386 print_binary_chars (stream, valaddr, len, byte_order);
389 print_hex_chars (stream, valaddr, len, byte_order);
392 print_char_chars (stream, type, valaddr, len, byte_order);
399 if (options->format != 'f')
400 val_long = unpack_long (type, valaddr);
402 /* If the value is a pointer, and pointers and addresses are not the
403 same, then at this point, the value's length (in target bytes) is
404 gdbarch_addr_bit/TARGET_CHAR_BIT, not TYPE_LENGTH (type). */
405 if (TYPE_CODE (type) == TYPE_CODE_PTR)
406 len = gdbarch_addr_bit (gdbarch) / TARGET_CHAR_BIT;
408 /* If we are printing it as unsigned, truncate it in case it is actually
409 a negative signed value (e.g. "print/u (short)-1" should print 65535
410 (if shorts are 16 bits) instead of 4294967295). */
411 if (options->format != 'd' || TYPE_UNSIGNED (type))
413 if (len < sizeof (LONGEST))
414 val_long &= ((LONGEST) 1 << HOST_CHAR_BIT * len) - 1;
417 switch (options->format)
422 /* No size specified, like in print. Print varying # of digits. */
423 print_longest (stream, 'x', 1, val_long);
432 print_longest (stream, size, 1, val_long);
435 error (_("Undefined output size \"%c\"."), size);
440 print_longest (stream, 'd', 1, val_long);
444 print_longest (stream, 'u', 0, val_long);
449 print_longest (stream, 'o', 1, val_long);
451 fprintf_filtered (stream, "0");
456 CORE_ADDR addr = unpack_pointer (type, valaddr);
458 print_address (gdbarch, addr, stream);
464 struct value_print_options opts = *options;
467 if (TYPE_UNSIGNED (type))
468 type = builtin_type (gdbarch)->builtin_true_unsigned_char;
470 type = builtin_type (gdbarch)->builtin_true_char;
472 value_print (value_from_longest (type, val_long), stream, &opts);
477 type = float_type_from_length (type);
478 print_floating (valaddr, type, stream);
482 internal_error (__FILE__, __LINE__,
483 _("failed internal consistency check"));
486 /* Binary; 't' stands for "two". */
488 char bits[8 * (sizeof val_long) + 1];
489 char buf[8 * (sizeof val_long) + 32];
494 width = 8 * (sizeof val_long);
511 error (_("Undefined output size \"%c\"."), size);
517 bits[width] = (val_long & 1) ? '1' : '0';
522 while (*cp && *cp == '0')
527 strncpy (buf, cp, sizeof (bits));
528 fputs_filtered (buf, stream);
533 print_hex_chars (stream, valaddr, len, byte_order);
537 error (_("Undefined output format \"%c\"."), options->format);
541 /* Specify default address for `x' command.
542 The `info lines' command uses this. */
545 set_next_address (struct gdbarch *gdbarch, CORE_ADDR addr)
547 struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
549 next_gdbarch = gdbarch;
552 /* Make address available to the user as $_. */
553 set_internalvar (lookup_internalvar ("_"),
554 value_from_pointer (ptr_type, addr));
557 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
558 after LEADIN. Print nothing if no symbolic name is found nearby.
559 Optionally also print source file and line number, if available.
560 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
561 or to interpret it as a possible C++ name and convert it back to source
562 form. However note that DO_DEMANGLE can be overridden by the specific
563 settings of the demangle and asm_demangle variables. Returns
564 non-zero if anything was printed; zero otherwise. */
567 print_address_symbolic (struct gdbarch *gdbarch, CORE_ADDR addr,
568 struct ui_file *stream,
569 int do_demangle, char *leadin)
572 char *filename = NULL;
577 /* Throw away both name and filename. */
578 struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &name);
579 make_cleanup (free_current_contents, &filename);
581 if (build_address_symbolic (gdbarch, addr, do_demangle, &name, &offset,
582 &filename, &line, &unmapped))
584 do_cleanups (cleanup_chain);
588 fputs_filtered (leadin, stream);
590 fputs_filtered ("<*", stream);
592 fputs_filtered ("<", stream);
593 fputs_filtered (name, stream);
595 fprintf_filtered (stream, "+%u", (unsigned int) offset);
597 /* Append source filename and line number if desired. Give specific
598 line # of this addr, if we have it; else line # of the nearest symbol. */
599 if (print_symbol_filename && filename != NULL)
602 fprintf_filtered (stream, " at %s:%d", filename, line);
604 fprintf_filtered (stream, " in %s", filename);
607 fputs_filtered ("*>", stream);
609 fputs_filtered (">", stream);
611 do_cleanups (cleanup_chain);
615 /* Given an address ADDR return all the elements needed to print the
616 address in a symbolic form. NAME can be mangled or not depending
617 on DO_DEMANGLE (and also on the asm_demangle global variable,
618 manipulated via ''set print asm-demangle''). Return 0 in case of
619 success, when all the info in the OUT paramters is valid. Return 1
622 build_address_symbolic (struct gdbarch *gdbarch,
623 CORE_ADDR addr, /* IN */
624 int do_demangle, /* IN */
625 char **name, /* OUT */
626 int *offset, /* OUT */
627 char **filename, /* OUT */
629 int *unmapped) /* OUT */
631 struct bound_minimal_symbol msymbol;
632 struct symbol *symbol;
633 CORE_ADDR name_location = 0;
634 struct obj_section *section = NULL;
635 const char *name_temp = "";
637 /* Let's say it is mapped (not unmapped). */
640 /* Determine if the address is in an overlay, and whether it is
642 if (overlay_debugging)
644 section = find_pc_overlay (addr);
645 if (pc_in_unmapped_range (addr, section))
648 addr = overlay_mapped_address (addr, section);
652 /* First try to find the address in the symbol table, then
653 in the minsyms. Take the closest one. */
655 /* This is defective in the sense that it only finds text symbols. So
656 really this is kind of pointless--we should make sure that the
657 minimal symbols have everything we need (by changing that we could
658 save some memory, but for many debug format--ELF/DWARF or
659 anything/stabs--it would be inconvenient to eliminate those minimal
661 msymbol = lookup_minimal_symbol_by_pc_section (addr, section);
662 symbol = find_pc_sect_function (addr, section);
666 /* If this is a function (i.e. a code address), strip out any
667 non-address bits. For instance, display a pointer to the
668 first instruction of a Thumb function as <function>; the
669 second instruction will be <function+2>, even though the
670 pointer is <function+3>. This matches the ISA behavior. */
671 addr = gdbarch_addr_bits_remove (gdbarch, addr);
673 name_location = BLOCK_START (SYMBOL_BLOCK_VALUE (symbol));
674 if (do_demangle || asm_demangle)
675 name_temp = SYMBOL_PRINT_NAME (symbol);
677 name_temp = SYMBOL_LINKAGE_NAME (symbol);
680 if (msymbol.minsym != NULL
681 && MSYMBOL_HAS_SIZE (msymbol.minsym)
682 && MSYMBOL_SIZE (msymbol.minsym) == 0
683 && MSYMBOL_TYPE (msymbol.minsym) != mst_text
684 && MSYMBOL_TYPE (msymbol.minsym) != mst_text_gnu_ifunc
685 && MSYMBOL_TYPE (msymbol.minsym) != mst_file_text)
686 msymbol.minsym = NULL;
688 if (msymbol.minsym != NULL)
690 if (BMSYMBOL_VALUE_ADDRESS (msymbol) > name_location || symbol == NULL)
692 /* If this is a function (i.e. a code address), strip out any
693 non-address bits. For instance, display a pointer to the
694 first instruction of a Thumb function as <function>; the
695 second instruction will be <function+2>, even though the
696 pointer is <function+3>. This matches the ISA behavior. */
697 if (MSYMBOL_TYPE (msymbol.minsym) == mst_text
698 || MSYMBOL_TYPE (msymbol.minsym) == mst_text_gnu_ifunc
699 || MSYMBOL_TYPE (msymbol.minsym) == mst_file_text
700 || MSYMBOL_TYPE (msymbol.minsym) == mst_solib_trampoline)
701 addr = gdbarch_addr_bits_remove (gdbarch, addr);
703 /* The msymbol is closer to the address than the symbol;
704 use the msymbol instead. */
706 name_location = BMSYMBOL_VALUE_ADDRESS (msymbol);
707 if (do_demangle || asm_demangle)
708 name_temp = MSYMBOL_PRINT_NAME (msymbol.minsym);
710 name_temp = MSYMBOL_LINKAGE_NAME (msymbol.minsym);
713 if (symbol == NULL && msymbol.minsym == NULL)
716 /* If the nearest symbol is too far away, don't print anything symbolic. */
718 /* For when CORE_ADDR is larger than unsigned int, we do math in
719 CORE_ADDR. But when we detect unsigned wraparound in the
720 CORE_ADDR math, we ignore this test and print the offset,
721 because addr+max_symbolic_offset has wrapped through the end
722 of the address space back to the beginning, giving bogus comparison. */
723 if (addr > name_location + max_symbolic_offset
724 && name_location + max_symbolic_offset > name_location)
727 *offset = addr - name_location;
729 *name = xstrdup (name_temp);
731 if (print_symbol_filename)
733 struct symtab_and_line sal;
735 sal = find_pc_sect_line (addr, section, 0);
739 *filename = xstrdup (symtab_to_filename_for_display (sal.symtab));
747 /* Print address ADDR symbolically on STREAM.
748 First print it as a number. Then perhaps print
749 <SYMBOL + OFFSET> after the number. */
752 print_address (struct gdbarch *gdbarch,
753 CORE_ADDR addr, struct ui_file *stream)
755 fputs_filtered (paddress (gdbarch, addr), stream);
756 print_address_symbolic (gdbarch, addr, stream, asm_demangle, " ");
759 /* Return a prefix for instruction address:
760 "=> " for current instruction, else " ". */
763 pc_prefix (CORE_ADDR addr)
765 if (has_stack_frames ())
767 struct frame_info *frame;
770 frame = get_selected_frame (NULL);
771 if (get_frame_pc_if_available (frame, &pc) && pc == addr)
777 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
778 controls whether to print the symbolic name "raw" or demangled.
779 Return non-zero if anything was printed; zero otherwise. */
782 print_address_demangle (const struct value_print_options *opts,
783 struct gdbarch *gdbarch, CORE_ADDR addr,
784 struct ui_file *stream, int do_demangle)
786 if (opts->addressprint)
788 fputs_filtered (paddress (gdbarch, addr), stream);
789 print_address_symbolic (gdbarch, addr, stream, do_demangle, " ");
793 return print_address_symbolic (gdbarch, addr, stream, do_demangle, "");
799 /* Examine data at address ADDR in format FMT.
800 Fetch it from memory and print on gdb_stdout. */
803 do_examine (struct format_data fmt, struct gdbarch *gdbarch, CORE_ADDR addr)
808 struct type *val_type = NULL;
811 struct value_print_options opts;
816 next_gdbarch = gdbarch;
819 /* Instruction format implies fetch single bytes
820 regardless of the specified size.
821 The case of strings is handled in decode_format, only explicit
822 size operator are not changed to 'b'. */
828 /* Pick the appropriate size for an address. */
829 if (gdbarch_ptr_bit (next_gdbarch) == 64)
831 else if (gdbarch_ptr_bit (next_gdbarch) == 32)
833 else if (gdbarch_ptr_bit (next_gdbarch) == 16)
836 /* Bad value for gdbarch_ptr_bit. */
837 internal_error (__FILE__, __LINE__,
838 _("failed internal consistency check"));
842 val_type = builtin_type (next_gdbarch)->builtin_int8;
843 else if (size == 'h')
844 val_type = builtin_type (next_gdbarch)->builtin_int16;
845 else if (size == 'w')
846 val_type = builtin_type (next_gdbarch)->builtin_int32;
847 else if (size == 'g')
848 val_type = builtin_type (next_gdbarch)->builtin_int64;
852 struct type *char_type = NULL;
854 /* Search for "char16_t" or "char32_t" types or fall back to 8-bit char
855 if type is not found. */
857 char_type = builtin_type (next_gdbarch)->builtin_char16;
858 else if (size == 'w')
859 char_type = builtin_type (next_gdbarch)->builtin_char32;
861 val_type = char_type;
864 if (size != '\0' && size != 'b')
865 warning (_("Unable to display strings with "
866 "size '%c', using 'b' instead."), size);
868 val_type = builtin_type (next_gdbarch)->builtin_int8;
877 if (format == 's' || format == 'i')
880 get_formatted_print_options (&opts, format);
882 /* Print as many objects as specified in COUNT, at most maxelts per line,
883 with the address of the next one at the start of each line. */
889 fputs_filtered (pc_prefix (next_address), gdb_stdout);
890 print_address (next_gdbarch, next_address, gdb_stdout);
891 printf_filtered (":");
896 printf_filtered ("\t");
897 /* Note that print_formatted sets next_address for the next
899 last_examine_address = next_address;
901 if (last_examine_value)
902 value_free (last_examine_value);
904 /* The value to be displayed is not fetched greedily.
905 Instead, to avoid the possibility of a fetched value not
906 being used, its retrieval is delayed until the print code
907 uses it. When examining an instruction stream, the
908 disassembler will perform its own memory fetch using just
909 the address stored in LAST_EXAMINE_VALUE. FIXME: Should
910 the disassembler be modified so that LAST_EXAMINE_VALUE
911 is left with the byte sequence from the last complete
912 instruction fetched from memory? */
913 last_examine_value = value_at_lazy (val_type, next_address);
915 if (last_examine_value)
916 release_value (last_examine_value);
918 print_formatted (last_examine_value, size, &opts, gdb_stdout);
920 /* Display any branch delay slots following the final insn. */
921 if (format == 'i' && count == 1)
922 count += branch_delay_insns;
924 printf_filtered ("\n");
925 gdb_flush (gdb_stdout);
930 validate_format (struct format_data fmt, const char *cmdname)
933 error (_("Size letters are meaningless in \"%s\" command."), cmdname);
935 error (_("Item count other than 1 is meaningless in \"%s\" command."),
937 if (fmt.format == 'i')
938 error (_("Format letter \"%c\" is meaningless in \"%s\" command."),
939 fmt.format, cmdname);
942 /* Evaluate string EXP as an expression in the current language and
943 print the resulting value. EXP may contain a format specifier as the
944 first argument ("/x myvar" for example, to print myvar in hex). */
947 print_command_1 (const char *exp, int voidprint)
949 struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
952 struct format_data fmt;
954 if (exp && *exp == '/')
957 fmt = decode_format (&exp, last_format, 0);
958 validate_format (fmt, "print");
959 last_format = format = fmt.format;
971 struct expression *expr;
973 expr = parse_expression (exp);
974 make_cleanup (free_current_contents, &expr);
975 val = evaluate_expression (expr);
978 val = access_value_history (0);
980 if (voidprint || (val && value_type (val) &&
981 TYPE_CODE (value_type (val)) != TYPE_CODE_VOID))
983 struct value_print_options opts;
984 int histindex = record_latest_value (val);
986 annotate_value_history_begin (histindex, value_type (val));
988 printf_filtered ("$%d = ", histindex);
990 annotate_value_history_value ();
992 get_formatted_print_options (&opts, format);
995 print_formatted (val, fmt.size, &opts, gdb_stdout);
996 printf_filtered ("\n");
998 annotate_value_history_end ();
1001 do_cleanups (old_chain);
1005 print_command (char *exp, int from_tty)
1007 print_command_1 (exp, 1);
1010 /* Same as print, except it doesn't print void results. */
1012 call_command (char *exp, int from_tty)
1014 print_command_1 (exp, 0);
1017 /* Implementation of the "output" command. */
1020 output_command (char *exp, int from_tty)
1022 output_command_const (exp, from_tty);
1025 /* Like output_command, but takes a const string as argument. */
1028 output_command_const (const char *exp, int from_tty)
1030 struct expression *expr;
1031 struct cleanup *old_chain;
1034 struct format_data fmt;
1035 struct value_print_options opts;
1040 if (exp && *exp == '/')
1043 fmt = decode_format (&exp, 0, 0);
1044 validate_format (fmt, "output");
1045 format = fmt.format;
1048 expr = parse_expression (exp);
1049 old_chain = make_cleanup (free_current_contents, &expr);
1051 val = evaluate_expression (expr);
1053 annotate_value_begin (value_type (val));
1055 get_formatted_print_options (&opts, format);
1057 print_formatted (val, fmt.size, &opts, gdb_stdout);
1059 annotate_value_end ();
1062 gdb_flush (gdb_stdout);
1064 do_cleanups (old_chain);
1068 set_command (char *exp, int from_tty)
1070 struct expression *expr = parse_expression (exp);
1071 struct cleanup *old_chain =
1072 make_cleanup (free_current_contents, &expr);
1074 if (expr->nelts >= 1)
1075 switch (expr->elts[0].opcode)
1077 case UNOP_PREINCREMENT:
1078 case UNOP_POSTINCREMENT:
1079 case UNOP_PREDECREMENT:
1080 case UNOP_POSTDECREMENT:
1082 case BINOP_ASSIGN_MODIFY:
1087 (_("Expression is not an assignment (and might have no effect)"));
1090 evaluate_expression (expr);
1091 do_cleanups (old_chain);
1095 sym_info (char *arg, int from_tty)
1097 struct minimal_symbol *msymbol;
1098 struct objfile *objfile;
1099 struct obj_section *osect;
1100 CORE_ADDR addr, sect_addr;
1102 unsigned int offset;
1105 error_no_arg (_("address"));
1107 addr = parse_and_eval_address (arg);
1108 ALL_OBJSECTIONS (objfile, osect)
1110 /* Only process each object file once, even if there's a separate
1112 if (objfile->separate_debug_objfile_backlink)
1115 sect_addr = overlay_mapped_address (addr, osect);
1117 if (obj_section_addr (osect) <= sect_addr
1118 && sect_addr < obj_section_endaddr (osect)
1120 = lookup_minimal_symbol_by_pc_section (sect_addr, osect).minsym))
1122 const char *obj_name, *mapped, *sec_name, *msym_name;
1124 struct cleanup *old_chain;
1127 offset = sect_addr - MSYMBOL_VALUE_ADDRESS (objfile, msymbol);
1128 mapped = section_is_mapped (osect) ? _("mapped") : _("unmapped");
1129 sec_name = osect->the_bfd_section->name;
1130 msym_name = MSYMBOL_PRINT_NAME (msymbol);
1132 /* Don't print the offset if it is zero.
1133 We assume there's no need to handle i18n of "sym + offset". */
1135 loc_string = xstrprintf ("%s + %u", msym_name, offset);
1137 loc_string = xstrprintf ("%s", msym_name);
1139 /* Use a cleanup to free loc_string in case the user quits
1140 a pagination request inside printf_filtered. */
1141 old_chain = make_cleanup (xfree, loc_string);
1143 gdb_assert (osect->objfile && objfile_name (osect->objfile));
1144 obj_name = objfile_name (osect->objfile);
1146 if (MULTI_OBJFILE_P ())
1147 if (pc_in_unmapped_range (addr, osect))
1148 if (section_is_overlay (osect))
1149 printf_filtered (_("%s in load address range of "
1150 "%s overlay section %s of %s\n"),
1151 loc_string, mapped, sec_name, obj_name);
1153 printf_filtered (_("%s in load address range of "
1154 "section %s of %s\n"),
1155 loc_string, sec_name, obj_name);
1157 if (section_is_overlay (osect))
1158 printf_filtered (_("%s in %s overlay section %s of %s\n"),
1159 loc_string, mapped, sec_name, obj_name);
1161 printf_filtered (_("%s in section %s of %s\n"),
1162 loc_string, sec_name, obj_name);
1164 if (pc_in_unmapped_range (addr, osect))
1165 if (section_is_overlay (osect))
1166 printf_filtered (_("%s in load address range of %s overlay "
1168 loc_string, mapped, sec_name);
1170 printf_filtered (_("%s in load address range of section %s\n"),
1171 loc_string, sec_name);
1173 if (section_is_overlay (osect))
1174 printf_filtered (_("%s in %s overlay section %s\n"),
1175 loc_string, mapped, sec_name);
1177 printf_filtered (_("%s in section %s\n"),
1178 loc_string, sec_name);
1180 do_cleanups (old_chain);
1184 printf_filtered (_("No symbol matches %s.\n"), arg);
1188 address_info (char *exp, int from_tty)
1190 struct gdbarch *gdbarch;
1193 struct bound_minimal_symbol msymbol;
1195 struct obj_section *section;
1196 CORE_ADDR load_addr, context_pc = 0;
1197 struct field_of_this_result is_a_field_of_this;
1200 error (_("Argument required."));
1202 sym = lookup_symbol (exp, get_selected_block (&context_pc), VAR_DOMAIN,
1203 &is_a_field_of_this);
1206 if (is_a_field_of_this.type != NULL)
1208 printf_filtered ("Symbol \"");
1209 fprintf_symbol_filtered (gdb_stdout, exp,
1210 current_language->la_language, DMGL_ANSI);
1211 printf_filtered ("\" is a field of the local class variable ");
1212 if (current_language->la_language == language_objc)
1213 printf_filtered ("`self'\n"); /* ObjC equivalent of "this" */
1215 printf_filtered ("`this'\n");
1219 msymbol = lookup_bound_minimal_symbol (exp);
1221 if (msymbol.minsym != NULL)
1223 struct objfile *objfile = msymbol.objfile;
1225 gdbarch = get_objfile_arch (objfile);
1226 load_addr = BMSYMBOL_VALUE_ADDRESS (msymbol);
1228 printf_filtered ("Symbol \"");
1229 fprintf_symbol_filtered (gdb_stdout, exp,
1230 current_language->la_language, DMGL_ANSI);
1231 printf_filtered ("\" is at ");
1232 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1233 printf_filtered (" in a file compiled without debugging");
1234 section = MSYMBOL_OBJ_SECTION (objfile, msymbol.minsym);
1235 if (section_is_overlay (section))
1237 load_addr = overlay_unmapped_address (load_addr, section);
1238 printf_filtered (",\n -- loaded at ");
1239 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1240 printf_filtered (" in overlay section %s",
1241 section->the_bfd_section->name);
1243 printf_filtered (".\n");
1246 error (_("No symbol \"%s\" in current context."), exp);
1250 printf_filtered ("Symbol \"");
1251 fprintf_symbol_filtered (gdb_stdout, SYMBOL_PRINT_NAME (sym),
1252 current_language->la_language, DMGL_ANSI);
1253 printf_filtered ("\" is ");
1254 val = SYMBOL_VALUE (sym);
1255 if (SYMBOL_OBJFILE_OWNED (sym))
1256 section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym);
1259 gdbarch = symbol_arch (sym);
1261 if (SYMBOL_COMPUTED_OPS (sym) != NULL)
1263 SYMBOL_COMPUTED_OPS (sym)->describe_location (sym, context_pc,
1265 printf_filtered (".\n");
1269 switch (SYMBOL_CLASS (sym))
1272 case LOC_CONST_BYTES:
1273 printf_filtered ("constant");
1277 printf_filtered ("a label at address ");
1278 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1279 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1280 if (section_is_overlay (section))
1282 load_addr = overlay_unmapped_address (load_addr, section);
1283 printf_filtered (",\n -- loaded at ");
1284 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1285 printf_filtered (" in overlay section %s",
1286 section->the_bfd_section->name);
1291 gdb_assert_not_reached (_("LOC_COMPUTED variable missing a method"));
1294 /* GDBARCH is the architecture associated with the objfile the symbol
1295 is defined in; the target architecture may be different, and may
1296 provide additional registers. However, we do not know the target
1297 architecture at this point. We assume the objfile architecture
1298 will contain all the standard registers that occur in debug info
1300 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1302 if (SYMBOL_IS_ARGUMENT (sym))
1303 printf_filtered (_("an argument in register %s"),
1304 gdbarch_register_name (gdbarch, regno));
1306 printf_filtered (_("a variable in register %s"),
1307 gdbarch_register_name (gdbarch, regno));
1311 printf_filtered (_("static storage at address "));
1312 load_addr = SYMBOL_VALUE_ADDRESS (sym);
1313 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1314 if (section_is_overlay (section))
1316 load_addr = overlay_unmapped_address (load_addr, section);
1317 printf_filtered (_(",\n -- loaded at "));
1318 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1319 printf_filtered (_(" in overlay section %s"),
1320 section->the_bfd_section->name);
1324 case LOC_REGPARM_ADDR:
1325 /* Note comment at LOC_REGISTER. */
1326 regno = SYMBOL_REGISTER_OPS (sym)->register_number (sym, gdbarch);
1327 printf_filtered (_("address of an argument in register %s"),
1328 gdbarch_register_name (gdbarch, regno));
1332 printf_filtered (_("an argument at offset %ld"), val);
1336 printf_filtered (_("a local variable at frame offset %ld"), val);
1340 printf_filtered (_("a reference argument at offset %ld"), val);
1344 printf_filtered (_("a typedef"));
1348 printf_filtered (_("a function at address "));
1349 load_addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
1350 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1351 if (section_is_overlay (section))
1353 load_addr = overlay_unmapped_address (load_addr, section);
1354 printf_filtered (_(",\n -- loaded at "));
1355 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1356 printf_filtered (_(" in overlay section %s"),
1357 section->the_bfd_section->name);
1361 case LOC_UNRESOLVED:
1363 struct bound_minimal_symbol msym;
1365 msym = lookup_minimal_symbol_and_objfile (SYMBOL_LINKAGE_NAME (sym));
1366 if (msym.minsym == NULL)
1367 printf_filtered ("unresolved");
1370 section = MSYMBOL_OBJ_SECTION (msym.objfile, msym.minsym);
1371 load_addr = BMSYMBOL_VALUE_ADDRESS (msym);
1374 && (section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
1375 printf_filtered (_("a thread-local variable at offset %s "
1376 "in the thread-local storage for `%s'"),
1377 paddress (gdbarch, load_addr),
1378 objfile_name (section->objfile));
1381 printf_filtered (_("static storage at address "));
1382 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1383 if (section_is_overlay (section))
1385 load_addr = overlay_unmapped_address (load_addr, section);
1386 printf_filtered (_(",\n -- loaded at "));
1387 fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
1388 printf_filtered (_(" in overlay section %s"),
1389 section->the_bfd_section->name);
1396 case LOC_OPTIMIZED_OUT:
1397 printf_filtered (_("optimized out"));
1401 printf_filtered (_("of unknown (botched) type"));
1404 printf_filtered (".\n");
1409 x_command (char *exp, int from_tty)
1411 struct expression *expr;
1412 struct format_data fmt;
1413 struct cleanup *old_chain;
1416 fmt.format = last_format ? last_format : 'x';
1417 fmt.size = last_size;
1421 if (exp && *exp == '/')
1423 const char *tmp = exp + 1;
1425 fmt = decode_format (&tmp, last_format, last_size);
1429 /* If we have an expression, evaluate it and use it as the address. */
1431 if (exp != 0 && *exp != 0)
1433 expr = parse_expression (exp);
1434 /* Cause expression not to be there any more if this command is
1435 repeated with Newline. But don't clobber a user-defined
1436 command's definition. */
1439 old_chain = make_cleanup (free_current_contents, &expr);
1440 val = evaluate_expression (expr);
1441 if (TYPE_CODE (value_type (val)) == TYPE_CODE_REF)
1442 val = coerce_ref (val);
1443 /* In rvalue contexts, such as this, functions are coerced into
1444 pointers to functions. This makes "x/i main" work. */
1445 if (/* last_format == 'i' && */
1446 TYPE_CODE (value_type (val)) == TYPE_CODE_FUNC
1447 && VALUE_LVAL (val) == lval_memory)
1448 next_address = value_address (val);
1450 next_address = value_as_address (val);
1452 next_gdbarch = expr->gdbarch;
1453 do_cleanups (old_chain);
1457 error_no_arg (_("starting display address"));
1459 do_examine (fmt, next_gdbarch, next_address);
1461 /* If the examine succeeds, we remember its size and format for next
1462 time. Set last_size to 'b' for strings. */
1463 if (fmt.format == 's')
1466 last_size = fmt.size;
1467 last_format = fmt.format;
1469 /* Set a couple of internal variables if appropriate. */
1470 if (last_examine_value)
1472 /* Make last address examined available to the user as $_. Use
1473 the correct pointer type. */
1474 struct type *pointer_type
1475 = lookup_pointer_type (value_type (last_examine_value));
1476 set_internalvar (lookup_internalvar ("_"),
1477 value_from_pointer (pointer_type,
1478 last_examine_address));
1480 /* Make contents of last address examined available to the user
1481 as $__. If the last value has not been fetched from memory
1482 then don't fetch it now; instead mark it by voiding the $__
1484 if (value_lazy (last_examine_value))
1485 clear_internalvar (lookup_internalvar ("__"));
1487 set_internalvar (lookup_internalvar ("__"), last_examine_value);
1492 /* Add an expression to the auto-display chain.
1493 Specify the expression. */
1496 display_command (char *arg, int from_tty)
1498 struct format_data fmt;
1499 struct expression *expr;
1500 struct display *newobj;
1502 const char *exp = arg;
1505 /* NOTE: cagney/2003-02-13 The `tui_active' was previously
1507 if (tui_active && exp != NULL && *exp == '$')
1508 display_it = (tui_set_layout_for_display_command (exp) == TUI_FAILURE);
1522 fmt = decode_format (&exp, 0, 0);
1523 if (fmt.size && fmt.format == 0)
1525 if (fmt.format == 'i' || fmt.format == 's')
1536 innermost_block = NULL;
1537 expr = parse_expression (exp);
1539 newobj = (struct display *) xmalloc (sizeof (struct display));
1541 newobj->exp_string = xstrdup (exp);
1543 newobj->block = innermost_block;
1544 newobj->pspace = current_program_space;
1545 newobj->next = display_chain;
1546 newobj->number = ++display_number;
1547 newobj->format = fmt;
1548 newobj->enabled_p = 1;
1549 display_chain = newobj;
1552 do_one_display (newobj);
1559 free_display (struct display *d)
1561 xfree (d->exp_string);
1566 /* Clear out the display_chain. Done when new symtabs are loaded,
1567 since this invalidates the types stored in many expressions. */
1570 clear_displays (void)
1574 while ((d = display_chain) != NULL)
1576 display_chain = d->next;
1581 /* Delete the auto-display DISPLAY. */
1584 delete_display (struct display *display)
1588 gdb_assert (display != NULL);
1590 if (display_chain == display)
1591 display_chain = display->next;
1594 if (d->next == display)
1596 d->next = display->next;
1600 free_display (display);
1603 /* Call FUNCTION on each of the displays whose numbers are given in
1604 ARGS. DATA is passed unmodified to FUNCTION. */
1607 map_display_numbers (char *args,
1608 void (*function) (struct display *,
1612 struct get_number_or_range_state state;
1616 error_no_arg (_("one or more display numbers"));
1618 init_number_or_range (&state, args);
1620 while (!state.finished)
1622 const char *p = state.string;
1624 num = get_number_or_range (&state);
1626 warning (_("bad display number at or near '%s'"), p);
1629 struct display *d, *tmp;
1631 ALL_DISPLAYS_SAFE (d, tmp)
1632 if (d->number == num)
1635 printf_unfiltered (_("No display number %d.\n"), num);
1642 /* Callback for map_display_numbers, that deletes a display. */
1645 do_delete_display (struct display *d, void *data)
1650 /* "undisplay" command. */
1653 undisplay_command (char *args, int from_tty)
1657 if (query (_("Delete all auto-display expressions? ")))
1663 map_display_numbers (args, do_delete_display, NULL);
1667 /* Display a single auto-display.
1668 Do nothing if the display cannot be printed in the current context,
1669 or if the display is disabled. */
1672 do_one_display (struct display *d)
1674 struct cleanup *old_chain;
1675 int within_current_scope;
1677 if (d->enabled_p == 0)
1680 /* The expression carries the architecture that was used at parse time.
1681 This is a problem if the expression depends on architecture features
1682 (e.g. register numbers), and the current architecture is now different.
1683 For example, a display statement like "display/i $pc" is expected to
1684 display the PC register of the current architecture, not the arch at
1685 the time the display command was given. Therefore, we re-parse the
1686 expression if the current architecture has changed. */
1687 if (d->exp != NULL && d->exp->gdbarch != get_current_arch ())
1699 innermost_block = NULL;
1700 d->exp = parse_expression (d->exp_string);
1701 d->block = innermost_block;
1703 CATCH (ex, RETURN_MASK_ALL)
1705 /* Can't re-parse the expression. Disable this display item. */
1707 warning (_("Unable to display \"%s\": %s"),
1708 d->exp_string, ex.message);
1716 if (d->pspace == current_program_space)
1717 within_current_scope = contained_in (get_selected_block (0), d->block);
1719 within_current_scope = 0;
1722 within_current_scope = 1;
1723 if (!within_current_scope)
1726 old_chain = make_cleanup_restore_integer (¤t_display_number);
1727 current_display_number = d->number;
1729 annotate_display_begin ();
1730 printf_filtered ("%d", d->number);
1731 annotate_display_number_end ();
1732 printf_filtered (": ");
1736 annotate_display_format ();
1738 printf_filtered ("x/");
1739 if (d->format.count != 1)
1740 printf_filtered ("%d", d->format.count);
1741 printf_filtered ("%c", d->format.format);
1742 if (d->format.format != 'i' && d->format.format != 's')
1743 printf_filtered ("%c", d->format.size);
1744 printf_filtered (" ");
1746 annotate_display_expression ();
1748 puts_filtered (d->exp_string);
1749 annotate_display_expression_end ();
1751 if (d->format.count != 1 || d->format.format == 'i')
1752 printf_filtered ("\n");
1754 printf_filtered (" ");
1756 annotate_display_value ();
1763 val = evaluate_expression (d->exp);
1764 addr = value_as_address (val);
1765 if (d->format.format == 'i')
1766 addr = gdbarch_addr_bits_remove (d->exp->gdbarch, addr);
1767 do_examine (d->format, d->exp->gdbarch, addr);
1769 CATCH (ex, RETURN_MASK_ERROR)
1771 fprintf_filtered (gdb_stdout, _("<error: %s>\n"), ex.message);
1777 struct value_print_options opts;
1779 annotate_display_format ();
1781 if (d->format.format)
1782 printf_filtered ("/%c ", d->format.format);
1784 annotate_display_expression ();
1786 puts_filtered (d->exp_string);
1787 annotate_display_expression_end ();
1789 printf_filtered (" = ");
1791 annotate_display_expression ();
1793 get_formatted_print_options (&opts, d->format.format);
1794 opts.raw = d->format.raw;
1800 val = evaluate_expression (d->exp);
1801 print_formatted (val, d->format.size, &opts, gdb_stdout);
1803 CATCH (ex, RETURN_MASK_ERROR)
1805 fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message);
1809 printf_filtered ("\n");
1812 annotate_display_end ();
1814 gdb_flush (gdb_stdout);
1815 do_cleanups (old_chain);
1818 /* Display all of the values on the auto-display chain which can be
1819 evaluated in the current scope. */
1826 for (d = display_chain; d; d = d->next)
1830 /* Delete the auto-display which we were in the process of displaying.
1831 This is done when there is an error or a signal. */
1834 disable_display (int num)
1838 for (d = display_chain; d; d = d->next)
1839 if (d->number == num)
1844 printf_unfiltered (_("No display number %d.\n"), num);
1848 disable_current_display (void)
1850 if (current_display_number >= 0)
1852 disable_display (current_display_number);
1853 fprintf_unfiltered (gdb_stderr,
1854 _("Disabling display %d to "
1855 "avoid infinite recursion.\n"),
1856 current_display_number);
1858 current_display_number = -1;
1862 display_info (char *ignore, int from_tty)
1867 printf_unfiltered (_("There are no auto-display expressions now.\n"));
1869 printf_filtered (_("Auto-display expressions now in effect:\n\
1870 Num Enb Expression\n"));
1872 for (d = display_chain; d; d = d->next)
1874 printf_filtered ("%d: %c ", d->number, "ny"[(int) d->enabled_p]);
1876 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
1878 else if (d->format.format)
1879 printf_filtered ("/%c ", d->format.format);
1880 puts_filtered (d->exp_string);
1881 if (d->block && !contained_in (get_selected_block (0), d->block))
1882 printf_filtered (_(" (cannot be evaluated in the current context)"));
1883 printf_filtered ("\n");
1884 gdb_flush (gdb_stdout);
1888 /* Callback fo map_display_numbers, that enables or disables the
1889 passed in display D. */
1892 do_enable_disable_display (struct display *d, void *data)
1894 d->enabled_p = *(int *) data;
1897 /* Implamentation of both the "disable display" and "enable display"
1898 commands. ENABLE decides what to do. */
1901 enable_disable_display_command (char *args, int from_tty, int enable)
1908 d->enabled_p = enable;
1912 map_display_numbers (args, do_enable_disable_display, &enable);
1915 /* The "enable display" command. */
1918 enable_display_command (char *args, int from_tty)
1920 enable_disable_display_command (args, from_tty, 1);
1923 /* The "disable display" command. */
1926 disable_display_command (char *args, int from_tty)
1928 enable_disable_display_command (args, from_tty, 0);
1931 /* display_chain items point to blocks and expressions. Some expressions in
1932 turn may point to symbols.
1933 Both symbols and blocks are obstack_alloc'd on objfile_stack, and are
1934 obstack_free'd when a shared library is unloaded.
1935 Clear pointers that are about to become dangling.
1936 Both .exp and .block fields will be restored next time we need to display
1937 an item by re-parsing .exp_string field in the new execution context. */
1940 clear_dangling_display_expressions (struct objfile *objfile)
1943 struct program_space *pspace;
1945 /* With no symbol file we cannot have a block or expression from it. */
1946 if (objfile == NULL)
1948 pspace = objfile->pspace;
1949 if (objfile->separate_debug_objfile_backlink)
1951 objfile = objfile->separate_debug_objfile_backlink;
1952 gdb_assert (objfile->pspace == pspace);
1955 for (d = display_chain; d != NULL; d = d->next)
1957 if (d->pspace != pspace)
1960 if (lookup_objfile_from_block (d->block) == objfile
1961 || (d->exp && exp_uses_objfile (d->exp, objfile)))
1971 /* Print the value in stack frame FRAME of a variable specified by a
1972 struct symbol. NAME is the name to print; if NULL then VAR's print
1973 name will be used. STREAM is the ui_file on which to print the
1974 value. INDENT specifies the number of indent levels to print
1975 before printing the variable name.
1977 This function invalidates FRAME. */
1980 print_variable_and_value (const char *name, struct symbol *var,
1981 struct frame_info *frame,
1982 struct ui_file *stream, int indent)
1986 name = SYMBOL_PRINT_NAME (var);
1988 fprintf_filtered (stream, "%s%s = ", n_spaces (2 * indent), name);
1992 struct value_print_options opts;
1994 val = read_var_value (var, frame);
1995 get_user_print_options (&opts);
1997 common_val_print (val, stream, indent, &opts, current_language);
1999 /* common_val_print invalidates FRAME when a pretty printer calls inferior
2003 CATCH (except, RETURN_MASK_ERROR)
2005 fprintf_filtered(stream, "<error reading variable %s (%s)>", name,
2010 fprintf_filtered (stream, "\n");
2013 /* Subroutine of ui_printf to simplify it.
2014 Print VALUE to STREAM using FORMAT.
2015 VALUE is a C-style string on the target. */
2018 printf_c_string (struct ui_file *stream, const char *format,
2019 struct value *value)
2025 tem = value_as_address (value);
2027 /* This is a %s argument. Find the length of the string. */
2033 read_memory (tem + j, &c, 1);
2038 /* Copy the string contents into a string inside GDB. */
2039 str = (gdb_byte *) alloca (j + 1);
2041 read_memory (tem, str, j);
2044 fprintf_filtered (stream, format, (char *) str);
2047 /* Subroutine of ui_printf to simplify it.
2048 Print VALUE to STREAM using FORMAT.
2049 VALUE is a wide C-style string on the target. */
2052 printf_wide_c_string (struct ui_file *stream, const char *format,
2053 struct value *value)
2058 struct gdbarch *gdbarch = get_type_arch (value_type (value));
2059 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2060 struct type *wctype = lookup_typename (current_language, gdbarch,
2061 "wchar_t", NULL, 0);
2062 int wcwidth = TYPE_LENGTH (wctype);
2063 gdb_byte *buf = alloca (wcwidth);
2064 struct obstack output;
2065 struct cleanup *inner_cleanup;
2067 tem = value_as_address (value);
2069 /* This is a %s argument. Find the length of the string. */
2070 for (j = 0;; j += wcwidth)
2073 read_memory (tem + j, buf, wcwidth);
2074 if (extract_unsigned_integer (buf, wcwidth, byte_order) == 0)
2078 /* Copy the string contents into a string inside GDB. */
2079 str = (gdb_byte *) alloca (j + wcwidth);
2081 read_memory (tem, str, j);
2082 memset (&str[j], 0, wcwidth);
2084 obstack_init (&output);
2085 inner_cleanup = make_cleanup_obstack_free (&output);
2087 convert_between_encodings (target_wide_charset (gdbarch),
2090 &output, translit_char);
2091 obstack_grow_str0 (&output, "");
2093 fprintf_filtered (stream, format, obstack_base (&output));
2094 do_cleanups (inner_cleanup);
2097 /* Subroutine of ui_printf to simplify it.
2098 Print VALUE, a decimal floating point value, to STREAM using FORMAT. */
2101 printf_decfloat (struct ui_file *stream, const char *format,
2102 struct value *value)
2104 const gdb_byte *param_ptr = value_contents (value);
2106 #if defined (PRINTF_HAS_DECFLOAT)
2107 /* If we have native support for Decimal floating
2108 printing, handle it here. */
2109 fprintf_filtered (stream, format, param_ptr);
2111 /* As a workaround until vasprintf has native support for DFP
2112 we convert the DFP values to string and print them using
2113 the %s format specifier. */
2116 /* Parameter data. */
2117 struct type *param_type = value_type (value);
2118 struct gdbarch *gdbarch = get_type_arch (param_type);
2119 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
2121 /* DFP output data. */
2122 struct value *dfp_value = NULL;
2126 struct type *dfp_type = NULL;
2127 char decstr[MAX_DECIMAL_STRING];
2129 /* Points to the end of the string so that we can go back
2130 and check for DFP length modifiers. */
2131 p = format + strlen (format);
2133 /* Look for the float/double format specifier. */
2134 while (*p != 'f' && *p != 'e' && *p != 'E'
2135 && *p != 'g' && *p != 'G')
2138 /* Search for the '%' char and extract the size and type of
2139 the output decimal value based on its modifiers
2140 (%Hf, %Df, %DDf). */
2146 dfp_type = builtin_type (gdbarch)->builtin_decfloat;
2148 else if (*p == 'D' && *(p - 1) == 'D')
2151 dfp_type = builtin_type (gdbarch)->builtin_declong;
2157 dfp_type = builtin_type (gdbarch)->builtin_decdouble;
2161 /* Conversion between different DFP types. */
2162 if (TYPE_CODE (param_type) == TYPE_CODE_DECFLOAT)
2163 decimal_convert (param_ptr, TYPE_LENGTH (param_type),
2164 byte_order, dec, dfp_len, byte_order);
2166 /* If this is a non-trivial conversion, just output 0.
2167 A correct converted value can be displayed by explicitly
2168 casting to a DFP type. */
2169 decimal_from_string (dec, dfp_len, byte_order, "0");
2171 dfp_value = value_from_decfloat (dfp_type, dec);
2173 dfp_ptr = (gdb_byte *) value_contents (dfp_value);
2175 decimal_to_string (dfp_ptr, dfp_len, byte_order, decstr);
2177 /* Print the DFP value. */
2178 fprintf_filtered (stream, "%s", decstr);
2182 /* Subroutine of ui_printf to simplify it.
2183 Print VALUE, a target pointer, to STREAM using FORMAT. */
2186 printf_pointer (struct ui_file *stream, const char *format,
2187 struct value *value)
2189 /* We avoid the host's %p because pointers are too
2190 likely to be the wrong size. The only interesting
2191 modifier for %p is a width; extract that, and then
2192 handle %p as glibc would: %#x or a literal "(nil)". */
2196 #ifdef PRINTF_HAS_LONG_LONG
2197 long long val = value_as_long (value);
2199 long val = value_as_long (value);
2202 fmt = alloca (strlen (format) + 5);
2204 /* Copy up to the leading %. */
2209 int is_percent = (*p == '%');
2224 /* Copy any width. */
2225 while (*p >= '0' && *p < '9')
2228 gdb_assert (*p == 'p' && *(p + 1) == '\0');
2231 #ifdef PRINTF_HAS_LONG_LONG
2237 fprintf_filtered (stream, fmt, val);
2243 fprintf_filtered (stream, fmt, "(nil)");
2247 /* printf "printf format string" ARG to STREAM. */
2250 ui_printf (const char *arg, struct ui_file *stream)
2252 struct format_piece *fpieces;
2253 const char *s = arg;
2254 struct value **val_args;
2255 int allocated_args = 20;
2256 struct cleanup *old_cleanups;
2258 val_args = xmalloc (allocated_args * sizeof (struct value *));
2259 old_cleanups = make_cleanup (free_current_contents, &val_args);
2262 error_no_arg (_("format-control string and values to print"));
2264 s = skip_spaces_const (s);
2266 /* A format string should follow, enveloped in double quotes. */
2268 error (_("Bad format string, missing '\"'."));
2270 fpieces = parse_format_string (&s);
2272 make_cleanup (free_format_pieces_cleanup, &fpieces);
2275 error (_("Bad format string, non-terminated '\"'."));
2277 s = skip_spaces_const (s);
2279 if (*s != ',' && *s != 0)
2280 error (_("Invalid argument syntax"));
2284 s = skip_spaces_const (s);
2290 char *current_substring;
2293 for (fr = 0; fpieces[fr].string != NULL; fr++)
2294 if (fpieces[fr].argclass != literal_piece)
2297 /* Now, parse all arguments and evaluate them.
2298 Store the VALUEs in VAL_ARGS. */
2304 if (nargs == allocated_args)
2305 val_args = (struct value **) xrealloc ((char *) val_args,
2306 (allocated_args *= 2)
2307 * sizeof (struct value *));
2309 val_args[nargs] = parse_to_comma_and_eval (&s1);
2317 if (nargs != nargs_wanted)
2318 error (_("Wrong number of arguments for specified format-string"));
2320 /* Now actually print them. */
2322 for (fr = 0; fpieces[fr].string != NULL; fr++)
2324 current_substring = fpieces[fr].string;
2325 switch (fpieces[fr].argclass)
2328 printf_c_string (stream, current_substring, val_args[i]);
2330 case wide_string_arg:
2331 printf_wide_c_string (stream, current_substring, val_args[i]);
2335 struct gdbarch *gdbarch
2336 = get_type_arch (value_type (val_args[i]));
2337 struct type *wctype = lookup_typename (current_language, gdbarch,
2338 "wchar_t", NULL, 0);
2339 struct type *valtype;
2340 struct obstack output;
2341 struct cleanup *inner_cleanup;
2342 const gdb_byte *bytes;
2344 valtype = value_type (val_args[i]);
2345 if (TYPE_LENGTH (valtype) != TYPE_LENGTH (wctype)
2346 || TYPE_CODE (valtype) != TYPE_CODE_INT)
2347 error (_("expected wchar_t argument for %%lc"));
2349 bytes = value_contents (val_args[i]);
2351 obstack_init (&output);
2352 inner_cleanup = make_cleanup_obstack_free (&output);
2354 convert_between_encodings (target_wide_charset (gdbarch),
2356 bytes, TYPE_LENGTH (valtype),
2357 TYPE_LENGTH (valtype),
2358 &output, translit_char);
2359 obstack_grow_str0 (&output, "");
2361 fprintf_filtered (stream, current_substring,
2362 obstack_base (&output));
2363 do_cleanups (inner_cleanup);
2368 struct type *type = value_type (val_args[i]);
2372 /* If format string wants a float, unchecked-convert the value
2373 to floating point of the same size. */
2374 type = float_type_from_length (type);
2375 val = unpack_double (type, value_contents (val_args[i]), &inv);
2377 error (_("Invalid floating value found in program."));
2379 fprintf_filtered (stream, current_substring, (double) val);
2382 case long_double_arg:
2383 #ifdef HAVE_LONG_DOUBLE
2385 struct type *type = value_type (val_args[i]);
2389 /* If format string wants a float, unchecked-convert the value
2390 to floating point of the same size. */
2391 type = float_type_from_length (type);
2392 val = unpack_double (type, value_contents (val_args[i]), &inv);
2394 error (_("Invalid floating value found in program."));
2396 fprintf_filtered (stream, current_substring,
2401 error (_("long double not supported in printf"));
2404 #ifdef PRINTF_HAS_LONG_LONG
2406 long long val = value_as_long (val_args[i]);
2408 fprintf_filtered (stream, current_substring, val);
2412 error (_("long long not supported in printf"));
2416 int val = value_as_long (val_args[i]);
2418 fprintf_filtered (stream, current_substring, val);
2423 long val = value_as_long (val_args[i]);
2425 fprintf_filtered (stream, current_substring, val);
2428 /* Handles decimal floating values. */
2430 printf_decfloat (stream, current_substring, val_args[i]);
2433 printf_pointer (stream, current_substring, val_args[i]);
2436 /* Print a portion of the format string that has no
2437 directives. Note that this will not include any
2438 ordinary %-specs, but it might include "%%". That is
2439 why we use printf_filtered and not puts_filtered here.
2440 Also, we pass a dummy argument because some platforms
2441 have modified GCC to include -Wformat-security by
2442 default, which will warn here if there is no
2444 fprintf_filtered (stream, current_substring, 0);
2447 internal_error (__FILE__, __LINE__,
2448 _("failed internal consistency check"));
2450 /* Maybe advance to the next argument. */
2451 if (fpieces[fr].argclass != literal_piece)
2455 do_cleanups (old_cleanups);
2458 /* Implement the "printf" command. */
2461 printf_command (char *arg, int from_tty)
2463 ui_printf (arg, gdb_stdout);
2464 gdb_flush (gdb_stdout);
2467 /* Implement the "eval" command. */
2470 eval_command (char *arg, int from_tty)
2472 struct ui_file *ui_out = mem_fileopen ();
2473 struct cleanup *cleanups = make_cleanup_ui_file_delete (ui_out);
2476 ui_printf (arg, ui_out);
2478 expanded = ui_file_xstrdup (ui_out, NULL);
2479 make_cleanup (xfree, expanded);
2481 execute_command (expanded, from_tty);
2483 do_cleanups (cleanups);
2487 _initialize_printcmd (void)
2489 struct cmd_list_element *c;
2491 current_display_number = -1;
2493 observer_attach_free_objfile (clear_dangling_display_expressions);
2495 add_info ("address", address_info,
2496 _("Describe where symbol SYM is stored."));
2498 add_info ("symbol", sym_info, _("\
2499 Describe what symbol is at location ADDR.\n\
2500 Only for symbols with fixed locations (global or static scope)."));
2502 add_com ("x", class_vars, x_command, _("\
2503 Examine memory: x/FMT ADDRESS.\n\
2504 ADDRESS is an expression for the memory address to examine.\n\
2505 FMT is a repeat count followed by a format letter and a size letter.\n\
2506 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
2507 t(binary), f(float), a(address), i(instruction), c(char), s(string)\n\
2508 and z(hex, zero padded on the left).\n\
2509 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
2510 The specified number of objects of the specified size are printed\n\
2511 according to the format.\n\n\
2512 Defaults for format and size letters are those previously used.\n\
2513 Default count is 1. Default address is following last thing printed\n\
2514 with this command or \"print\"."));
2517 add_com ("whereis", class_vars, whereis_command,
2518 _("Print line number and file of definition of variable."));
2521 add_info ("display", display_info, _("\
2522 Expressions to display when program stops, with code numbers."));
2524 add_cmd ("undisplay", class_vars, undisplay_command, _("\
2525 Cancel some expressions to be displayed when program stops.\n\
2526 Arguments are the code numbers of the expressions to stop displaying.\n\
2527 No argument means cancel all automatic-display expressions.\n\
2528 \"delete display\" has the same effect as this command.\n\
2529 Do \"info display\" to see current list of code numbers."),
2532 add_com ("display", class_vars, display_command, _("\
2533 Print value of expression EXP each time the program stops.\n\
2534 /FMT may be used before EXP as in the \"print\" command.\n\
2535 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
2536 as in the \"x\" command, and then EXP is used to get the address to examine\n\
2537 and examining is done as in the \"x\" command.\n\n\
2538 With no argument, display all currently requested auto-display expressions.\n\
2539 Use \"undisplay\" to cancel display requests previously made."));
2541 add_cmd ("display", class_vars, enable_display_command, _("\
2542 Enable some expressions to be displayed when program stops.\n\
2543 Arguments are the code numbers of the expressions to resume displaying.\n\
2544 No argument means enable all automatic-display expressions.\n\
2545 Do \"info display\" to see current list of code numbers."), &enablelist);
2547 add_cmd ("display", class_vars, disable_display_command, _("\
2548 Disable some expressions to be displayed when program stops.\n\
2549 Arguments are the code numbers of the expressions to stop displaying.\n\
2550 No argument means disable all automatic-display expressions.\n\
2551 Do \"info display\" to see current list of code numbers."), &disablelist);
2553 add_cmd ("display", class_vars, undisplay_command, _("\
2554 Cancel some expressions to be displayed when program stops.\n\
2555 Arguments are the code numbers of the expressions to stop displaying.\n\
2556 No argument means cancel all automatic-display expressions.\n\
2557 Do \"info display\" to see current list of code numbers."), &deletelist);
2559 add_com ("printf", class_vars, printf_command, _("\
2560 printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
2561 This is useful for formatted output in user-defined commands."));
2563 add_com ("output", class_vars, output_command, _("\
2564 Like \"print\" but don't put in value history and don't print newline.\n\
2565 This is useful in user-defined commands."));
2567 add_prefix_cmd ("set", class_vars, set_command, _("\
2568 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2569 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2570 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2571 with $), a register (a few standard names starting with $), or an actual\n\
2572 variable in the program being debugged. EXP is any valid expression.\n\
2573 Use \"set variable\" for variables with names identical to set subcommands.\n\
2575 With a subcommand, this command modifies parts of the gdb environment.\n\
2576 You can see these environment settings with the \"show\" command."),
2577 &setlist, "set ", 1, &cmdlist);
2579 add_com ("assign", class_vars, set_command, _("\
2580 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2581 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2582 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2583 with $), a register (a few standard names starting with $), or an actual\n\
2584 variable in the program being debugged. EXP is any valid expression.\n\
2585 Use \"set variable\" for variables with names identical to set subcommands.\n\
2586 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2587 You can see these environment settings with the \"show\" command."));
2589 /* "call" is the same as "set", but handy for dbx users to call fns. */
2590 c = add_com ("call", class_vars, call_command, _("\
2591 Call a function in the program.\n\
2592 The argument is the function name and arguments, in the notation of the\n\
2593 current working language. The result is printed and saved in the value\n\
2594 history, if it is not void."));
2595 set_cmd_completer (c, expression_completer);
2597 add_cmd ("variable", class_vars, set_command, _("\
2598 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2599 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2600 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2601 with $), a register (a few standard names starting with $), or an actual\n\
2602 variable in the program being debugged. EXP is any valid expression.\n\
2603 This may usually be abbreviated to simply \"set\"."),
2606 c = add_com ("print", class_vars, print_command, _("\
2607 Print value of expression EXP.\n\
2608 Variables accessible are those of the lexical environment of the selected\n\
2609 stack frame, plus all those whose scope is global or an entire file.\n\
2611 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2612 $$NUM refers to NUM'th value back from the last one.\n\
2613 Names starting with $ refer to registers (with the values they would have\n\
2614 if the program were to return to the stack frame now selected, restoring\n\
2615 all registers saved by frames farther in) or else to debugger\n\
2616 \"convenience\" variables (any such name not a known register).\n\
2617 Use assignment expressions to give values to convenience variables.\n\
2619 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2620 @ is a binary operator for treating consecutive data objects\n\
2621 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2622 element is FOO, whose second element is stored in the space following\n\
2623 where FOO is stored, etc. FOO must be an expression whose value\n\
2624 resides in memory.\n\
2626 EXP may be preceded with /FMT, where FMT is a format letter\n\
2627 but no count or size letter (see \"x\" command)."));
2628 set_cmd_completer (c, expression_completer);
2629 add_com_alias ("p", "print", class_vars, 1);
2630 add_com_alias ("inspect", "print", class_vars, 1);
2632 add_setshow_uinteger_cmd ("max-symbolic-offset", no_class,
2633 &max_symbolic_offset, _("\
2634 Set the largest offset that will be printed in <symbol+1234> form."), _("\
2635 Show the largest offset that will be printed in <symbol+1234> form."), _("\
2636 Tell GDB to only display the symbolic form of an address if the\n\
2637 offset between the closest earlier symbol and the address is less than\n\
2638 the specified maximum offset. The default is \"unlimited\", which tells GDB\n\
2639 to always print the symbolic form of an address if any symbol precedes\n\
2640 it. Zero is equivalent to \"unlimited\"."),
2642 show_max_symbolic_offset,
2643 &setprintlist, &showprintlist);
2644 add_setshow_boolean_cmd ("symbol-filename", no_class,
2645 &print_symbol_filename, _("\
2646 Set printing of source filename and line number with <symbol>."), _("\
2647 Show printing of source filename and line number with <symbol>."), NULL,
2649 show_print_symbol_filename,
2650 &setprintlist, &showprintlist);
2652 add_com ("eval", no_class, eval_command, _("\
2653 Convert \"printf format string\", arg1, arg2, arg3, ..., argn to\n\
2654 a command line, and call it."));