1 /* Print values for GNU debugger GDB.
2 Copyright 1986, 1987, 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include "expression.h"
31 #include "breakpoint.h"
34 extern int asm_demangle; /* Whether to demangle syms in asm printouts */
35 extern int addressprint; /* Whether to print hex addresses in HLL " */
44 /* Last specified output format. */
46 static char last_format = 'x';
48 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
50 static char last_size = 'w';
52 /* Default address to examine next. */
54 static CORE_ADDR next_address;
56 /* Last address examined. */
58 static CORE_ADDR last_examine_address;
60 /* Contents of last address examined.
61 This is not valid past the end of the `x' command! */
63 static value last_examine_value;
65 /* Largest offset between a symbolic value and an address, that will be
66 printed as `0x1234 <symbol+offset>'. */
68 static unsigned int max_symbolic_offset = UINT_MAX;
70 /* Number of auto-display expression currently being displayed.
71 So that we can disable it if we get an error or a signal within it.
72 -1 when not doing one. */
74 int current_display_number;
76 /* Flag to low-level print routines that this value is being printed
77 in an epoch window. We'd like to pass this as a parameter, but
78 every routine would need to take it. Perhaps we can encapsulate
79 this in the I/O stream once we have GNU stdio. */
85 /* Chain link to next auto-display item. */
87 /* Expression to be evaluated and displayed. */
88 struct expression *exp;
89 /* Item number of this auto-display item. */
91 /* Display format specified. */
92 struct format_data format;
93 /* Innermost block required by this expression when evaluated */
95 /* Status of this display (enabled or disabled) */
99 /* Chain of expressions whose values should be displayed
100 automatically each time the program stops. */
102 static struct display *display_chain;
104 static int display_number;
106 /* Prototypes for local functions */
109 delete_display PARAMS ((int));
112 enable_display PARAMS ((char *, int));
115 disable_display_command PARAMS ((char *, int));
118 disassemble_command PARAMS ((char *, int));
121 containing_function_bounds PARAMS ((CORE_ADDR, CORE_ADDR *, CORE_ADDR *));
124 printf_command PARAMS ((char *, int));
127 print_frame_nameless_args PARAMS ((struct frame_info *, long, int, int,
131 display_info PARAMS ((char *, int));
134 do_one_display PARAMS ((struct display *));
137 undisplay_command PARAMS ((char *, int));
140 free_display PARAMS ((struct display *));
143 display_command PARAMS ((char *, int));
146 x_command PARAMS ((char *, int));
149 address_info PARAMS ((char *, int));
152 set_command PARAMS ((char *, int));
155 output_command PARAMS ((char *, int));
158 call_command PARAMS ((char *, int));
161 inspect_command PARAMS ((char *, int));
164 print_command PARAMS ((char *, int));
167 print_command_1 PARAMS ((char *, int, int));
170 validate_format PARAMS ((struct format_data, char *));
173 do_examine PARAMS ((struct format_data, CORE_ADDR));
176 print_formatted PARAMS ((value, int, int));
178 static struct format_data
179 decode_format PARAMS ((char **, int, int));
182 /* Decode a format specification. *STRING_PTR should point to it.
183 OFORMAT and OSIZE are used as defaults for the format and size
184 if none are given in the format specification.
185 If OSIZE is zero, then the size field of the returned value
186 should be set only if a size is explicitly specified by the
188 The structure returned describes all the data
189 found in the specification. In addition, *STRING_PTR is advanced
190 past the specification and past all whitespace following it. */
192 static struct format_data
193 decode_format (string_ptr, oformat, osize)
198 struct format_data val;
199 register char *p = *string_ptr;
205 if (*p >= '0' && *p <= '9')
206 val.count = atoi (p);
207 while (*p >= '0' && *p <= '9') p++;
209 /* Now process size or format letters that follow. */
213 if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g')
222 else if (*p >= 'a' && *p <= 'z')
229 /* Make sure 'g' size is not used on integer types.
230 Well, actually, we can handle hex. */
231 if (val.size == 'g' && val.format != 'f' && val.format != 'x')
235 while (*p == ' ' || *p == '\t') p++;
238 /* Set defaults for format and size if not specified. */
239 if (val.format == '?')
243 /* Neither has been specified. */
244 val.format = oformat;
248 /* If a size is specified, any format makes a reasonable
249 default except 'i'. */
250 val.format = oformat == 'i' ? 'x' : oformat;
252 else if (val.size == '?')
257 /* Addresses must be words. */
258 val.size = osize ? 'w' : osize;
261 /* Floating point has to be word or giantword. */
262 if (osize == 'w' || osize == 'g')
265 /* Default it to giantword if the last used size is not
267 val.size = osize ? 'g' : osize;
270 /* Characters default to one byte. */
271 val.size = osize ? 'b' : osize;
274 /* The default is the size most recently specified. */
281 /* Print value VAL on stdout according to FORMAT, a letter or 0.
282 Do not end with a newline.
283 0 means print VAL according to its own type.
284 SIZE is the letter for the size of datum being printed.
285 This is used to pad hex numbers so they line up. */
288 print_formatted (val, format, size)
293 int len = TYPE_LENGTH (VALUE_TYPE (val));
295 if (VALUE_LVAL (val) == lval_memory)
296 next_address = VALUE_ADDRESS (val) + len;
301 next_address = VALUE_ADDRESS (val)
302 + value_print (value_addr (val), stdout, format, Val_pretty_default);
306 wrap_here (""); /* Force output out, print_insn not using _filtered */
307 next_address = VALUE_ADDRESS (val)
308 + print_insn (VALUE_ADDRESS (val), stdout);
313 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_ARRAY
314 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_STRING
315 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_STRUCT
316 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_UNION
317 || VALUE_REPEATED (val))
318 value_print (val, stdout, format, Val_pretty_default);
320 print_scalar_formatted (VALUE_CONTENTS (val), VALUE_TYPE (val),
321 format, size, stdout);
325 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
326 according to letters FORMAT and SIZE on STREAM.
327 FORMAT may not be zero. Formats s and i are not supported at this level.
329 This is how the elements of an array or structure are printed
333 print_scalar_formatted (valaddr, type, format, size, stream)
341 int len = TYPE_LENGTH (type);
343 if (size == 'g' && sizeof (LONGEST) < 8
346 /* ok, we're going to have to get fancy here. Assumption: a
347 long is four bytes. FIXME. */
348 unsigned long v1, v2;
350 v1 = unpack_long (builtin_type_long, valaddr);
351 v2 = unpack_long (builtin_type_long, valaddr + 4);
353 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
354 /* Swap the two for printing */
367 fprintf_filtered (stream, local_hex_format_custom("08x%08"), v1, v2);
370 error ("Output size \"g\" unimplemented for format \"%c\".",
376 val_long = unpack_long (type, valaddr);
378 /* If value is unsigned, truncate it in case negative. */
381 if (len == sizeof (char))
382 val_long &= (1 << 8 * sizeof(char)) - 1;
383 else if (len == sizeof (short))
384 val_long &= (1 << 8 * sizeof(short)) - 1;
385 else if (len == sizeof (long))
386 val_long &= (unsigned long) - 1;
394 /* no size specified, like in print. Print varying # of digits. */
395 #if defined (LONG_LONG)
396 fprintf_filtered (stream, local_hex_format_custom("ll"), val_long);
397 #else /* not LONG_LONG. */
398 fprintf_filtered (stream, local_hex_format_custom("l"), val_long);
399 #endif /* not LONG_LONG. */
402 #if defined (LONG_LONG)
406 fprintf_filtered (stream, local_hex_format_custom("02ll"), val_long);
409 fprintf_filtered (stream, local_hex_format_custom("04ll"), val_long);
412 fprintf_filtered (stream, local_hex_format_custom("08ll"), val_long);
415 fprintf_filtered (stream, local_hex_format_custom("016ll"), val_long);
418 error ("Undefined output size \"%c\".", size);
420 #else /* not LONG_LONG. */
424 fprintf_filtered (stream, local_hex_format_custom("02"), val_long);
427 fprintf_filtered (stream, local_hex_format_custom("04"), val_long);
430 fprintf_filtered (stream, local_hex_format_custom("08"), val_long);
433 fprintf_filtered (stream, local_hex_format_custom("016"), val_long);
436 error ("Undefined output size \"%c\".", size);
438 #endif /* not LONG_LONG */
443 fprintf_filtered (stream, local_decimal_format_custom("ll"), val_long);
445 fprintf_filtered (stream, local_decimal_format(), val_long);
451 fprintf_filtered (stream, "%llu", val_long);
453 fprintf_filtered (stream, "%u", val_long);
460 fprintf_filtered (stream, local_octal_format_custom("ll"), val_long);
462 fprintf_filtered (stream, local_octal_format(), val_long);
465 fprintf_filtered (stream, "0");
469 print_address (unpack_pointer (type, valaddr), stream);
473 value_print (value_from_longest (builtin_type_char, val_long), stream, 0,
478 if (len == sizeof (float))
479 type = builtin_type_float;
480 else if (len == sizeof (double))
481 type = builtin_type_double;
482 print_floating (valaddr, type, stream);
489 /* Binary; 't' stands for "two". */
491 char bits[8*(sizeof val_long) + 1];
496 width = 8*(sizeof val_long);
513 error ("Undefined output size \"%c\".", size);
519 bits[width] = (val_long & 1) ? '1' : '0';
524 while (*cp && *cp == '0')
529 fprintf_filtered (stream, local_binary_format_prefix());
530 fprintf_filtered (stream, cp);
531 fprintf_filtered (stream, local_binary_format_suffix());
536 error ("Undefined output format \"%c\".", format);
540 /* Specify default address for `x' command.
541 `info lines' uses this. */
544 set_next_address (addr)
549 /* Make address available to the user as $_. */
550 set_internalvar (lookup_internalvar ("_"),
551 value_from_longest (lookup_pointer_type (builtin_type_void),
555 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM,
556 after LEADIN. Print nothing if no symbolic name is found nearby.
557 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
558 or to interpret it as a possible C++ name and convert it back to source
559 form. However note that DO_DEMANGLE can be overridden by the specific
560 settings of the demangle and asm_demangle variables. */
563 print_address_symbolic (addr, stream, do_demangle, leadin)
569 CORE_ADDR name_location;
570 register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (addr);
572 /* If nothing comes out, don't print anything symbolic. */
577 /* If the nearest symbol is too far away, ditto. */
579 name_location = SYMBOL_VALUE_ADDRESS (msymbol);
581 /* For when CORE_ADDR is larger than unsigned int, we do math in
582 CORE_ADDR. But when we detect unsigned wraparound in the
583 CORE_ADDR math, we ignore this test and print the offset,
584 because addr+max_symbolic_offset has wrapped through the end
585 of the address space back to the beginning, giving bogus comparison. */
586 if (addr > name_location + max_symbolic_offset
587 && name_location + max_symbolic_offset > name_location)
590 fputs_filtered (leadin, stream);
591 fputs_filtered ("<", stream);
593 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
595 fputs_filtered (SYMBOL_LINKAGE_NAME (msymbol), stream);
596 if (addr != name_location)
597 fprintf_filtered (stream, "+%d>", (int)(addr - name_location));
599 fputs_filtered (">", stream);
602 /* Print address ADDR symbolically on STREAM.
603 First print it as a number. Then perhaps print
604 <SYMBOL + OFFSET> after the number. */
607 print_address (addr, stream)
611 #ifdef ADDR_BITS_REMOVE
612 fprintf_filtered (stream, local_hex_format(), ADDR_BITS_REMOVE(addr));
614 fprintf_filtered (stream, local_hex_format(), addr);
616 print_address_symbolic (addr, stream, asm_demangle, " ");
619 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
620 controls whether to print the symbolic name "raw" or demangled.
621 Global setting "addressprint" controls whether to print hex address
625 print_address_demangle (addr, stream, do_demangle)
631 fprintf_filtered (stream, "0");
632 } else if (addressprint) {
633 fprintf_filtered (stream, local_hex_format(), addr);
634 print_address_symbolic (addr, stream, do_demangle, " ");
636 print_address_symbolic (addr, stream, do_demangle, "");
641 /* Examine data at address ADDR in format FMT.
642 Fetch it from memory and print on stdout. */
645 do_examine (fmt, addr)
646 struct format_data fmt;
649 register char format = 0;
651 register int count = 1;
652 struct type *val_type;
654 register int maxelts;
661 /* String or instruction format implies fetch single bytes
662 regardless of the specified size. */
663 if (format == 's' || format == 'i')
667 val_type = builtin_type_char;
668 else if (size == 'h')
669 val_type = builtin_type_short;
670 else if (size == 'w')
671 val_type = builtin_type_long;
672 else if (size == 'g')
674 val_type = builtin_type_double;
676 val_type = builtin_type_long_long;
684 if (format == 's' || format == 'i')
687 /* Print as many objects as specified in COUNT, at most maxelts per line,
688 with the address of the next one at the start of each line. */
692 print_address (next_address, stdout);
693 printf_filtered (":");
698 printf_filtered ("\t");
699 /* Note that print_formatted sets next_address for the next
701 last_examine_address = next_address;
702 last_examine_value = value_at (val_type, next_address);
703 print_formatted (last_examine_value, format, size);
705 printf_filtered ("\n");
711 validate_format (fmt, cmdname)
712 struct format_data fmt;
716 error ("Size letters are meaningless in \"%s\" command.", cmdname);
718 error ("Item count other than 1 is meaningless in \"%s\" command.",
720 if (fmt.format == 'i' || fmt.format == 's')
721 error ("Format letter \"%c\" is meaningless in \"%s\" command.",
722 fmt.format, cmdname);
725 /* Evaluate string EXP as an expression in the current language and
726 print the resulting value. EXP may contain a format specifier as the
727 first argument ("/x myvar" for example, to print myvar in hex).
731 print_command_1 (exp, inspect, voidprint)
736 struct expression *expr;
737 register struct cleanup *old_chain = 0;
738 register char format = 0;
740 struct format_data fmt;
743 /* Pass inspect flag to the rest of the print routines in a global (sigh). */
744 inspect_it = inspect;
746 if (exp && *exp == '/')
749 fmt = decode_format (&exp, last_format, 0);
750 validate_format (fmt, "print");
751 last_format = format = fmt.format;
762 extern int objectprint;
764 expr = parse_expression (exp);
765 old_chain = make_cleanup (free_current_contents, &expr);
767 val = evaluate_expression (expr);
769 /* C++: figure out what type we actually want to print it as. */
770 type = VALUE_TYPE (val);
773 && ( TYPE_CODE (type) == TYPE_CODE_PTR
774 || TYPE_CODE (type) == TYPE_CODE_REF)
775 && ( TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT
776 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_UNION))
780 v = value_from_vtable_info (val, TYPE_TARGET_TYPE (type));
784 type = VALUE_TYPE (val);
789 val = access_value_history (0);
791 if (voidprint || (val && VALUE_TYPE (val) &&
792 TYPE_CODE (VALUE_TYPE (val)) != TYPE_CODE_VOID))
794 int histindex = record_latest_value (val);
797 printf ("\031(gdb-makebuffer \"%s\" %d '(\"", exp, histindex);
799 if (histindex >= 0) printf_filtered ("$%d = ", histindex);
801 print_formatted (val, format, fmt.size);
802 printf_filtered ("\n");
808 do_cleanups (old_chain);
809 inspect_it = 0; /* Reset print routines to normal */
814 print_command (exp, from_tty)
818 print_command_1 (exp, 0, 1);
821 /* Same as print, except in epoch, it gets its own window */
824 inspect_command (exp, from_tty)
828 extern int epoch_interface;
830 print_command_1 (exp, epoch_interface, 1);
833 /* Same as print, except it doesn't print void results. */
836 call_command (exp, from_tty)
840 print_command_1 (exp, 0, 0);
845 output_command (exp, from_tty)
849 struct expression *expr;
850 register struct cleanup *old_chain;
851 register char format = 0;
853 struct format_data fmt;
855 if (exp && *exp == '/')
858 fmt = decode_format (&exp, 0, 0);
859 validate_format (fmt, "output");
863 expr = parse_expression (exp);
864 old_chain = make_cleanup (free_current_contents, &expr);
866 val = evaluate_expression (expr);
868 print_formatted (val, format, fmt.size);
870 do_cleanups (old_chain);
875 set_command (exp, from_tty)
879 struct expression *expr = parse_expression (exp);
880 register struct cleanup *old_chain
881 = make_cleanup (free_current_contents, &expr);
882 evaluate_expression (expr);
883 do_cleanups (old_chain);
888 address_info (exp, from_tty)
892 register struct symbol *sym;
893 register struct minimal_symbol *msymbol;
895 register long basereg;
896 int is_a_field_of_this; /* C++: lookup_symbol sets this to nonzero
897 if exp is a field of `this'. */
900 error ("Argument required.");
902 sym = lookup_symbol (exp, get_selected_block (), VAR_NAMESPACE,
903 &is_a_field_of_this, (struct symtab **)NULL);
906 if (is_a_field_of_this)
908 printf ("Symbol \"%s\" is a field of the local class variable `this'\n", exp);
912 msymbol = lookup_minimal_symbol (exp, (struct objfile *) NULL);
915 printf ("Symbol \"%s\" is at %s in a file compiled without debugging.\n",
916 exp, local_hex_string(SYMBOL_VALUE_ADDRESS (msymbol)));
918 error ("No symbol \"%s\" in current context.", exp);
922 printf ("Symbol \"%s\" is ", SYMBOL_NAME (sym));
923 val = SYMBOL_VALUE (sym);
924 basereg = SYMBOL_BASEREG (sym);
926 switch (SYMBOL_CLASS (sym))
929 case LOC_CONST_BYTES:
934 printf ("a label at address %s", local_hex_string(SYMBOL_VALUE_ADDRESS (sym)));
938 printf ("a variable in register %s", reg_names[val]);
942 printf ("static storage at address %s", local_hex_string(SYMBOL_VALUE_ADDRESS (sym)));
946 printf ("an argument in register %s", reg_names[val]);
950 if (SYMBOL_BASEREG_VALID (sym))
952 printf ("an argument at offset %ld from register %s",
953 val, reg_names[basereg]);
957 printf ("an argument at offset %ld", val);
962 if (SYMBOL_BASEREG_VALID (sym))
964 printf ("an argument at offset %ld from register %s",
965 val, reg_names[basereg]);
969 printf ("an argument at frame offset %ld", val);
974 if (SYMBOL_BASEREG_VALID (sym))
976 printf ("a local variable at offset %ld from register %s",
977 val, reg_names[basereg]);
981 printf ("a local variable at frame offset %ld", val);
986 printf ("a reference argument at offset %ld", val);
990 printf ("a typedef");
994 printf ("a function at address %s",
995 local_hex_string(BLOCK_START (SYMBOL_BLOCK_VALUE (sym))));
999 printf ("of unknown (botched) type");
1006 x_command (exp, from_tty)
1010 struct expression *expr;
1011 struct format_data fmt;
1012 struct cleanup *old_chain;
1015 fmt.format = last_format;
1016 fmt.size = last_size;
1019 if (exp && *exp == '/')
1022 fmt = decode_format (&exp, last_format, last_size);
1025 /* If we have an expression, evaluate it and use it as the address. */
1027 if (exp != 0 && *exp != 0)
1029 expr = parse_expression (exp);
1030 /* Cause expression not to be there any more
1031 if this command is repeated with Newline.
1032 But don't clobber a user-defined command's definition. */
1035 old_chain = make_cleanup (free_current_contents, &expr);
1036 val = evaluate_expression (expr);
1037 if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_REF)
1038 val = value_ind (val);
1039 /* In rvalue contexts, such as this, functions are coerced into
1040 pointers to functions. This makes "x/i main" work. */
1041 if (/* last_format == 'i'
1042 && */ TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC
1043 && VALUE_LVAL (val) == lval_memory)
1044 next_address = VALUE_ADDRESS (val);
1046 next_address = value_as_pointer (val);
1047 do_cleanups (old_chain);
1050 do_examine (fmt, next_address);
1052 /* If the examine succeeds, we remember its size and format for next time. */
1053 last_size = fmt.size;
1054 last_format = fmt.format;
1056 /* Set a couple of internal variables if appropriate. */
1057 if (last_examine_value)
1059 /* Make last address examined available to the user as $_. Use
1060 the correct pointer type. */
1061 set_internalvar (lookup_internalvar ("_"),
1062 value_from_longest (
1063 lookup_pointer_type (VALUE_TYPE (last_examine_value)),
1064 (LONGEST) last_examine_address));
1066 /* Make contents of last address examined available to the user as $__.*/
1067 set_internalvar (lookup_internalvar ("__"), last_examine_value);
1072 /* Add an expression to the auto-display chain.
1073 Specify the expression. */
1076 display_command (exp, from_tty)
1080 struct format_data fmt;
1081 register struct expression *expr;
1082 register struct display *new;
1093 fmt = decode_format (&exp, 0, 0);
1094 if (fmt.size && fmt.format == 0)
1096 if (fmt.format == 'i' || fmt.format == 's')
1106 innermost_block = 0;
1107 expr = parse_expression (exp);
1109 new = (struct display *) xmalloc (sizeof (struct display));
1112 new->block = innermost_block;
1113 new->next = display_chain;
1114 new->number = ++display_number;
1116 new->status = enabled;
1117 display_chain = new;
1119 if (from_tty && target_has_execution)
1120 do_one_display (new);
1133 /* Clear out the display_chain.
1134 Done when new symtabs are loaded, since this invalidates
1135 the types stored in many expressions. */
1140 register struct display *d;
1142 while ((d = display_chain) != NULL)
1145 display_chain = d->next;
1150 /* Delete the auto-display number NUM. */
1153 delete_display (num)
1156 register struct display *d1, *d;
1159 error ("No display number %d.", num);
1161 if (display_chain->number == num)
1164 display_chain = d1->next;
1168 for (d = display_chain; ; d = d->next)
1171 error ("No display number %d.", num);
1172 if (d->next->number == num)
1182 /* Delete some values from the auto-display chain.
1183 Specify the element numbers. */
1186 undisplay_command (args, from_tty)
1190 register char *p = args;
1196 if (query ("Delete all auto-display expressions? "))
1205 while (*p1 >= '0' && *p1 <= '9') p1++;
1206 if (*p1 && *p1 != ' ' && *p1 != '\t')
1207 error ("Arguments must be display numbers.");
1211 delete_display (num);
1214 while (*p == ' ' || *p == '\t') p++;
1219 /* Display a single auto-display.
1220 Do nothing if the display cannot be printed in the current context,
1221 or if the display is disabled. */
1227 int within_current_scope;
1229 if (d->status == disabled)
1233 within_current_scope = contained_in (get_selected_block (), d->block);
1235 within_current_scope = 1;
1236 if (!within_current_scope)
1239 current_display_number = d->number;
1241 printf_filtered ("%d: ", d->number);
1246 printf_filtered ("x/");
1247 if (d->format.count != 1)
1248 printf_filtered ("%d", d->format.count);
1249 printf_filtered ("%c", d->format.format);
1250 if (d->format.format != 'i' && d->format.format != 's')
1251 printf_filtered ("%c", d->format.size);
1252 printf_filtered (" ");
1253 print_expression (d->exp, stdout);
1254 if (d->format.count != 1)
1255 printf_filtered ("\n");
1257 printf_filtered (" ");
1259 addr = value_as_pointer (evaluate_expression (d->exp));
1260 if (d->format.format == 'i')
1261 addr = ADDR_BITS_REMOVE (addr);
1263 do_examine (d->format, addr);
1267 if (d->format.format)
1268 printf_filtered ("/%c ", d->format.format);
1269 print_expression (d->exp, stdout);
1270 printf_filtered (" = ");
1271 print_formatted (evaluate_expression (d->exp),
1272 d->format.format, d->format.size);
1273 printf_filtered ("\n");
1277 current_display_number = -1;
1280 /* Display all of the values on the auto-display chain which can be
1281 evaluated in the current scope. */
1286 register struct display *d;
1288 for (d = display_chain; d; d = d->next)
1292 /* Delete the auto-display which we were in the process of displaying.
1293 This is done when there is an error or a signal. */
1296 disable_display (num)
1299 register struct display *d;
1301 for (d = display_chain; d; d = d->next)
1302 if (d->number == num)
1304 d->status = disabled;
1307 printf ("No display number %d.\n", num);
1311 disable_current_display ()
1313 if (current_display_number >= 0)
1315 disable_display (current_display_number);
1316 fprintf (stderr, "Disabling display %d to avoid infinite recursion.\n",
1317 current_display_number);
1319 current_display_number = -1;
1323 display_info (ignore, from_tty)
1327 register struct display *d;
1330 printf ("There are no auto-display expressions now.\n");
1332 printf_filtered ("Auto-display expressions now in effect:\n\
1333 Num Enb Expression\n");
1335 for (d = display_chain; d; d = d->next)
1337 printf_filtered ("%d: %c ", d->number, "ny"[(int)d->status]);
1339 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
1341 else if (d->format.format)
1342 printf_filtered ("/%c ", d->format.format);
1343 print_expression (d->exp, stdout);
1344 if (d->block && !contained_in (get_selected_block (), d->block))
1345 printf_filtered (" (cannot be evaluated in the current context)");
1346 printf_filtered ("\n");
1352 enable_display (args, from_tty)
1356 register char *p = args;
1359 register struct display *d;
1363 for (d = display_chain; d; d = d->next)
1364 d->status = enabled;
1370 while (*p1 >= '0' && *p1 <= '9')
1372 if (*p1 && *p1 != ' ' && *p1 != '\t')
1373 error ("Arguments must be display numbers.");
1377 for (d = display_chain; d; d = d->next)
1378 if (d->number == num)
1380 d->status = enabled;
1383 printf ("No display number %d.\n", num);
1386 while (*p == ' ' || *p == '\t')
1393 disable_display_command (args, from_tty)
1397 register char *p = args;
1399 register struct display *d;
1403 for (d = display_chain; d; d = d->next)
1404 d->status = disabled;
1410 while (*p1 >= '0' && *p1 <= '9')
1412 if (*p1 && *p1 != ' ' && *p1 != '\t')
1413 error ("Arguments must be display numbers.");
1415 disable_display (atoi (p));
1418 while (*p == ' ' || *p == '\t')
1424 /* Print the value in stack frame FRAME of a variable
1425 specified by a struct symbol. */
1428 print_variable_value (var, frame, stream)
1433 value val = read_var_value (var, frame);
1434 value_print (val, stream, 0, Val_pretty_default);
1437 /* Print the arguments of a stack frame, given the function FUNC
1438 running in that frame (as a symbol), the info on the frame,
1439 and the number of args according to the stack frame (or -1 if unknown). */
1441 /* References here and elsewhere to "number of args according to the
1442 stack frame" appear in all cases to refer to "number of ints of args
1443 according to the stack frame". At least for VAX, i386, isi. */
1446 print_frame_args (func, fi, num, stream)
1447 struct symbol *func;
1448 struct frame_info *fi;
1456 register struct symbol *sym;
1458 /* Offset of next stack argument beyond the one we have seen that is
1459 at the highest offset.
1460 -1 if we haven't come to a stack argument yet. */
1461 long highest_offset = -1;
1463 /* Number of ints of arguments that we have printed so far. */
1464 int args_printed = 0;
1468 b = SYMBOL_BLOCK_VALUE (func);
1469 nsyms = BLOCK_NSYMS (b);
1472 for (i = 0; i < nsyms; i++)
1475 sym = BLOCK_SYM (b, i);
1477 /* Keep track of the highest stack argument offset seen, and
1478 skip over any kinds of symbols we don't care about. */
1480 switch (SYMBOL_CLASS (sym)) {
1484 long current_offset = SYMBOL_VALUE (sym);
1486 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
1488 /* Compute address of next argument by adding the size of
1489 this argument and rounding to an int boundary. */
1491 = ((current_offset + arg_size + sizeof (int) - 1)
1492 & ~(sizeof (int) - 1));
1494 /* If this is the highest offset seen yet, set highest_offset. */
1495 if (highest_offset == -1
1496 || (current_offset > highest_offset))
1497 highest_offset = current_offset;
1499 /* Add the number of ints we're about to print to args_printed. */
1500 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
1503 /* We care about types of symbols, but don't need to keep track of
1504 stack offsets in them. */
1509 /* Other types of symbols we just skip over. */
1514 /* If the symbol name is non-null,
1515 we have to re-look-up the symbol because arguments often have
1516 two entries (one a parameter, one a register or local), and the one
1517 we want is the non-parm, which lookup_symbol will find for
1518 us. After this, sym could be any SYMBOL_CLASS...
1520 Null parameter names occur on the RS/6000, for traceback tables.
1521 FIXME, should we even print them? */
1523 if (*SYMBOL_NAME (sym))
1524 sym = lookup_symbol (SYMBOL_NAME (sym),
1525 b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL);
1527 /* Print the current arg. */
1529 fprintf_filtered (stream, ", ");
1531 fprint_symbol (stream, SYMBOL_SOURCE_NAME (sym));
1532 fputs_filtered ("=", stream);
1534 /* Avoid value_print because it will deref ref parameters. We just
1535 want to print their addresses. Print ??? for args whose address
1536 we do not know. We pass 2 as "recurse" to val_print because our
1537 standard indentation here is 4 spaces, and val_print indents
1538 2 for each recurse. */
1539 val = read_var_value (sym, FRAME_INFO_ID (fi));
1541 val_print (VALUE_TYPE (val), VALUE_CONTENTS (val), VALUE_ADDRESS (val),
1542 stream, 0, 0, 2, Val_no_prettyprint);
1544 fputs_filtered ("???", stream);
1548 /* Don't print nameless args in situations where we don't know
1549 enough about the stack to find them. */
1554 if (highest_offset == -1)
1555 start = FRAME_ARGS_SKIP;
1557 start = highest_offset;
1559 print_frame_nameless_args (fi, start, num - args_printed,
1564 /* Print nameless args on STREAM.
1565 FI is the frameinfo for this frame, START is the offset
1566 of the first nameless arg, and NUM is the number of nameless args to
1567 print. FIRST is nonzero if this is the first argument (not just
1568 the first nameless arg). */
1570 print_frame_nameless_args (fi, start, num, first, stream)
1571 struct frame_info *fi;
1581 for (i = 0; i < num; i++)
1584 #ifdef NAMELESS_ARG_VALUE
1585 NAMELESS_ARG_VALUE (fi, start, &arg_value);
1587 argsaddr = FRAME_ARGS_ADDRESS (fi);
1591 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
1595 fprintf_filtered (stream, ", ");
1597 #ifdef PRINT_NAMELESS_INTEGER
1598 PRINT_NAMELESS_INTEGER (stream, arg_value);
1600 #ifdef PRINT_TYPELESS_INTEGER
1601 PRINT_TYPELESS_INTEGER (stream, builtin_type_int, (LONGEST) arg_value);
1603 fprintf_filtered (stream, "%d", arg_value);
1604 #endif /* PRINT_TYPELESS_INTEGER */
1605 #endif /* PRINT_NAMELESS_INTEGER */
1607 start += sizeof (int);
1613 printf_command (arg, from_tty)
1618 register char *s = arg;
1622 int allocated_args = 20;
1625 val_args = (value *) xmalloc (allocated_args * sizeof (value));
1628 error_no_arg ("format-control string and values to print");
1630 /* Skip white space before format string */
1631 while (*s == ' ' || *s == '\t') s++;
1633 /* A format string should follow, enveloped in double quotes */
1635 error ("Bad format string, missing '\"'.");
1637 /* Parse the format-control string and copy it into the string STRING,
1638 processing some kinds of escape sequence. */
1640 f = string = (char *) alloca (strlen (s) + 1);
1647 error ("Bad format string, non-terminated '\"'.");
1648 /* doesn't return */
1669 /* ??? TODO: handle other escape sequences */
1670 error ("Unrecognized \\ escape character in format string.");
1679 /* Skip over " and following space and comma. */
1682 while (*s == ' ' || *s == '\t') s++;
1684 if (*s != ',' && *s != 0)
1685 error ("Invalid argument syntax");
1688 while (*s == ' ' || *s == '\t') s++;
1691 /* Now scan the string for %-specs and see what kinds of args they want.
1692 argclass[I] classifies the %-specs so we can give vprintf something
1693 of the right size. */
1695 enum argclass {int_arg, string_arg, double_arg, long_long_arg};
1696 enum argclass *argclass;
1702 argclass = (enum argclass *) alloca (strlen (s) * sizeof *argclass);
1709 while (strchr ("0123456789.hlL-+ #", *f))
1711 if (*f == 'l' || *f == 'L')
1716 argclass[nargs_wanted++] = string_arg;
1717 else if (*f == 'e' || *f == 'f' || *f == 'g')
1718 argclass[nargs_wanted++] = double_arg;
1719 else if (lcount > 1)
1720 argclass[nargs_wanted++] = long_long_arg;
1722 argclass[nargs_wanted++] = int_arg;
1726 /* Now, parse all arguments and evaluate them.
1727 Store the VALUEs in VAL_ARGS. */
1732 if (nargs == allocated_args)
1733 val_args = (value *) xrealloc ((char *) val_args,
1734 (allocated_args *= 2)
1737 val_args[nargs] = parse_to_comma_and_eval (&s1);
1739 /* If format string wants a float, unchecked-convert the value to
1740 floating point of the same size */
1742 if (argclass[nargs] == double_arg)
1744 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (float))
1745 VALUE_TYPE (val_args[nargs]) = builtin_type_float;
1746 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (double))
1747 VALUE_TYPE (val_args[nargs]) = builtin_type_double;
1755 if (nargs != nargs_wanted)
1756 error ("Wrong number of arguments for specified format-string");
1758 /* Now lay out an argument-list containing the arguments
1759 as doubles, integers and C pointers. */
1761 arg_bytes = (char *) alloca (sizeof (double) * nargs);
1763 for (i = 0; i < nargs; i++)
1765 if (argclass[i] == string_arg)
1770 tem = value_as_pointer (val_args[i]);
1772 /* This is a %s argument. Find the length of the string. */
1777 read_memory (tem + j, &c, 1);
1782 /* Copy the string contents into a string inside GDB. */
1783 str = (char *) alloca (j + 1);
1784 read_memory (tem, str, j);
1787 /* Pass address of internal copy as the arg to vprintf. */
1788 *((int *) &arg_bytes[argindex]) = (int) str;
1789 argindex += sizeof (int);
1791 else if (VALUE_TYPE (val_args[i])->code == TYPE_CODE_FLT)
1793 *((double *) &arg_bytes[argindex]) = value_as_double (val_args[i]);
1794 argindex += sizeof (double);
1798 if (argclass[i] == long_long_arg)
1800 *(long long *) &arg_bytes[argindex] = value_as_long (val_args[i]);
1801 argindex += sizeof (long long);
1806 *((long *) &arg_bytes[argindex]) = value_as_long (val_args[i]);
1807 argindex += sizeof (long);
1812 /* There is not a standard way to make a va_list, so we need
1813 to do various things for different systems. */
1814 #if defined (__INT_VARARGS_H)
1819 list.__va_stk = (int *) arg_bytes;
1820 list.__va_reg = (int *) arg_bytes;
1821 vprintf (string, list);
1823 #else /* No __INT_VARARGS_H. */
1824 vprintf (string, arg_bytes);
1825 #endif /* No __INT_VARARGS_H. */
1828 /* Helper function for asdump_command. Finds the bounds of a function
1829 for a specified section of text. PC is an address within the
1830 function which you want bounds for; *LOW and *HIGH are set to the
1831 beginning (inclusive) and end (exclusive) of the function. This
1832 function returns 1 on success and 0 on failure. */
1835 containing_function_bounds (pc, low, high)
1836 CORE_ADDR pc, *low, *high;
1840 if (!find_pc_partial_function (pc, 0, low))
1846 if (!find_pc_partial_function (scan, 0, high))
1848 } while (*low == *high);
1853 /* Dump a specified section of assembly code. With no command line
1854 arguments, this command will dump the assembly code for the
1855 function surrounding the pc value in the selected frame. With one
1856 argument, it will dump the assembly code surrounding that pc value.
1857 Two arguments are interpeted as bounds within which to dump
1862 disassemble_command (arg, from_tty)
1866 CORE_ADDR low, high;
1872 if (!selected_frame)
1873 error ("No frame selected.\n");
1875 pc = get_frame_pc (selected_frame);
1876 if (!containing_function_bounds (pc, &low, &high))
1877 error ("No function contains pc specified by selected frame.\n");
1879 else if (!(space_index = (char *) strchr (arg, ' ')))
1882 pc = parse_and_eval_address (arg);
1883 if (!containing_function_bounds (pc, &low, &high))
1884 error ("No function contains specified pc.\n");
1888 /* Two arguments. */
1889 *space_index = '\0';
1890 low = parse_and_eval_address (arg);
1891 high = parse_and_eval_address (space_index + 1);
1894 printf_filtered ("Dump of assembler code ");
1898 find_pc_partial_function (pc, &name, 0);
1899 printf_filtered ("for function %s:\n", name);
1903 printf_filtered ("from %s ", local_hex_string(low));
1904 printf_filtered ("to %s:\n", local_hex_string(high));
1907 /* Dump the specified range. */
1908 for (pc = low; pc < high; )
1911 print_address (pc, stdout);
1912 printf_filtered (":\t");
1913 pc += print_insn (pc, stdout);
1914 printf_filtered ("\n");
1916 printf_filtered ("End of assembler dump.\n");
1922 _initialize_printcmd ()
1924 current_display_number = -1;
1926 add_info ("address", address_info,
1927 "Describe where variable VAR is stored.");
1929 add_com ("x", class_vars, x_command,
1930 "Examine memory: x/FMT ADDRESS.\n\
1931 ADDRESS is an expression for the memory address to examine.\n\
1932 FMT is a repeat count followed by a format letter and a size letter.\n\
1933 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
1934 f(float), a(address), i(instruction), c(char) and s(string).\n\
1935 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
1936 g is meaningful only with f, for type double.\n\
1937 The specified number of objects of the specified size are printed\n\
1938 according to the format.\n\n\
1939 Defaults for format and size letters are those previously used.\n\
1940 Default count is 1. Default address is following last thing printed\n\
1941 with this command or \"print\".");
1943 add_com ("disassemble", class_vars, disassemble_command,
1944 "Disassemble a specified section of memory.\n\
1945 Default is the function surrounding the pc of the selected frame.\n\
1946 With a single argument, the function surrounding that address is dumped.\n\
1947 Two arguments are taken as a range of memory to dump.");
1950 add_com ("whereis", class_vars, whereis_command,
1951 "Print line number and file of definition of variable.");
1954 add_info ("display", display_info,
1955 "Expressions to display when program stops, with code numbers.");
1957 add_cmd ("undisplay", class_vars, undisplay_command,
1958 "Cancel some expressions to be displayed when program stops.\n\
1959 Arguments are the code numbers of the expressions to stop displaying.\n\
1960 No argument means cancel all automatic-display expressions.\n\
1961 \"delete display\" has the same effect as this command.\n\
1962 Do \"info display\" to see current list of code numbers.",
1965 add_com ("display", class_vars, display_command,
1966 "Print value of expression EXP each time the program stops.\n\
1967 /FMT may be used before EXP as in the \"print\" command.\n\
1968 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
1969 as in the \"x\" command, and then EXP is used to get the address to examine\n\
1970 and examining is done as in the \"x\" command.\n\n\
1971 With no argument, display all currently requested auto-display expressions.\n\
1972 Use \"undisplay\" to cancel display requests previously made.");
1974 add_cmd ("display", class_vars, enable_display,
1975 "Enable some expressions to be displayed when program stops.\n\
1976 Arguments are the code numbers of the expressions to resume displaying.\n\
1977 No argument means enable all automatic-display expressions.\n\
1978 Do \"info display\" to see current list of code numbers.", &enablelist);
1980 add_cmd ("display", class_vars, disable_display_command,
1981 "Disable some expressions to be displayed when program stops.\n\
1982 Arguments are the code numbers of the expressions to stop displaying.\n\
1983 No argument means disable all automatic-display expressions.\n\
1984 Do \"info display\" to see current list of code numbers.", &disablelist);
1986 add_cmd ("display", class_vars, undisplay_command,
1987 "Cancel some expressions to be displayed when program stops.\n\
1988 Arguments are the code numbers of the expressions to stop displaying.\n\
1989 No argument means cancel all automatic-display expressions.\n\
1990 Do \"info display\" to see current list of code numbers.", &deletelist);
1992 add_com ("printf", class_vars, printf_command,
1993 "printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
1994 This is useful for formatted output in user-defined commands.");
1995 add_com ("output", class_vars, output_command,
1996 "Like \"print\" but don't put in value history and don't print newline.\n\
1997 This is useful in user-defined commands.");
1999 add_prefix_cmd ("set", class_vars, set_command,
2000 "Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2001 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2002 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2003 with $), a register (a few standard names starting with $), or an actual\n\
2004 variable in the program being debugged. EXP is any valid expression.\n\
2005 Use \"set variable\" for variables with names identical to set subcommands.\n\
2006 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
2007 You can see these environment settings with the \"show\" command.",
2008 &setlist, "set ", 1, &cmdlist);
2010 /* "call" is the same as "set", but handy for dbx users to call fns. */
2011 add_com ("call", class_vars, call_command,
2012 "Call a function in the inferior process.\n\
2013 The argument is the function name and arguments, in the notation of the\n\
2014 current working language. The result is printed and saved in the value\n\
2015 history, if it is not void.");
2017 add_cmd ("variable", class_vars, set_command,
2018 "Evaluate expression EXP and assign result to variable VAR, using assignment\n\
2019 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
2020 example). VAR may be a debugger \"convenience\" variable (names starting\n\
2021 with $), a register (a few standard names starting with $), or an actual\n\
2022 variable in the program being debugged. EXP is any valid expression.\n\
2023 This may usually be abbreviated to simply \"set\".",
2026 add_com ("print", class_vars, print_command,
2027 concat ("Print value of expression EXP.\n\
2028 Variables accessible are those of the lexical environment of the selected\n\
2029 stack frame, plus all those whose scope is global or an entire file.\n\
2031 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2032 $$NUM refers to NUM'th value back from the last one.\n\
2033 Names starting with $ refer to registers (with the values they would have\n\
2034 if the program were to return to the stack frame now selected, restoring\n\
2035 all registers saved by frames farther in) or else to debugger\n\
2036 \"convenience\" variables (any such name not a known register).\n\
2037 Use assignment expressions to give values to convenience variables.\n",
2039 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2040 @ is a binary operator for treating consecutive data objects\n\
2041 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2042 element is FOO, whose second element is stored in the space following\n\
2043 where FOO is stored, etc. FOO must be an expression whose value\n\
2044 resides in memory.\n",
2046 EXP may be preceded with /FMT, where FMT is a format letter\n\
2047 but no count or size letter (see \"x\" command).", NULL));
2048 add_com_alias ("p", "print", class_vars, 1);
2050 add_com ("inspect", class_vars, inspect_command,
2051 "Same as \"print\" command, except that if you are running in the epoch\n\
2052 environment, the value is printed in its own window.");
2055 add_set_cmd ("max-symbolic-offset", no_class, var_uinteger,
2056 (char *)&max_symbolic_offset,
2057 "Set the largest offset that will be printed in <symbol+1234> form.",