1 /* Print values for GNU debugger GDB.
2 Copyright (C) 1986-1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 GDB 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 1, or (at your option)
11 GDB 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 GDB; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include "expression.h"
32 extern int asm_demangle; /* Whether to demangle syms in asm printouts */
34 extern struct block *get_current_block ();
36 static void print_frame_nameless_args ();
45 /* Last specified output format. */
47 static char last_format = 'x';
49 /* Last specified examination size. 'b', 'h', 'w' or `q'. */
51 static char last_size = 'w';
53 /* Default address to examine next. */
55 static CORE_ADDR next_address;
57 /* Last address examined. */
59 static CORE_ADDR last_examine_address;
61 /* Contents of last address examined.
62 This is not valid past the end of the `x' command! */
64 static value last_examine_value;
66 /* Number of auto-display expression currently being displayed.
67 So that we can deleted it if we get an error or a signal within it.
68 -1 when not doing one. */
70 int current_display_number;
72 /* Flag to low-level print routines that this value is being printed
73 in an epoch window. We'd like to pass this as a parameter, but
74 every routine would need to take it. Perhaps we can encapsulate
75 this in the I/O stream once we have GNU stdio. */
79 static void do_one_display ();
82 void print_scalar_formatted ();
85 /* Decode a format specification. *STRING_PTR should point to it.
86 OFORMAT and OSIZE are used as defaults for the format and size
87 if none are given in the format specification.
88 If OSIZE is zero, then the size field of the returned value
89 should be set only if a size is explicitly specified by the
91 The structure returned describes all the data
92 found in the specification. In addition, *STRING_PTR is advanced
93 past the specification and past all whitespace following it. */
96 decode_format (string_ptr, oformat, osize)
101 struct format_data val;
102 register char *p = *string_ptr;
108 if (*p >= '0' && *p <= '9')
109 val.count = atoi (p);
110 while (*p >= '0' && *p <= '9') p++;
112 /* Now process size or format letters that follow. */
116 if (*p == 'b' || *p == 'h' || *p == 'w' || *p == 'g')
125 else if (*p >= 'a' && *p <= 'z')
132 /* Make sure 'g' size is not used on integer types.
133 Well, actually, we can handle hex. */
134 if (val.size == 'g' && val.format != 'f' && val.format != 'x')
138 while (*p == ' ' || *p == '\t') p++;
141 /* Set defaults for format and size if not specified. */
142 if (val.format == '?')
146 /* Neither has been specified. */
147 val.format = oformat;
151 /* If a size is specified, any format makes a reasonable
152 default except 'i'. */
153 val.format = oformat == 'i' ? 'x' : oformat;
155 else if (val.size == '?')
160 /* Addresses must be words. */
161 val.size = osize ? 'w' : osize;
164 /* Floating point has to be word or giantword. */
165 if (osize == 'w' || osize == 'g')
168 /* Default it to giantword if the last used size is not
170 val.size = osize ? 'g' : osize;
173 /* Characters default to one byte. */
174 val.size = osize ? 'b' : osize;
177 /* The default is the size most recently specified. */
184 /* Print value VAL on stdout according to FORMAT, a letter or 0.
185 Do not end with a newline.
186 0 means print VAL according to its own type.
187 SIZE is the letter for the size of datum being printed.
188 This is used to pad hex numbers so they line up. */
191 print_formatted (val, format, size)
193 register char format;
196 int len = TYPE_LENGTH (VALUE_TYPE (val));
198 if (VALUE_LVAL (val) == lval_memory)
199 next_address = VALUE_ADDRESS (val) + len;
204 next_address = VALUE_ADDRESS (val)
205 + value_print (value_addr (val), stdout, format, Val_pretty_default);
209 next_address = VALUE_ADDRESS (val)
210 + print_insn (VALUE_ADDRESS (val), stdout);
215 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_ARRAY
216 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_STRUCT
217 || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_UNION
218 || VALUE_REPEATED (val))
219 value_print (val, stdout, format, Val_pretty_default);
221 print_scalar_formatted (VALUE_CONTENTS (val), VALUE_TYPE (val),
222 format, size, stdout);
226 /* Print a scalar of data of type TYPE, pointed to in GDB by VALADDR,
227 according to letters FORMAT and SIZE on STREAM.
228 FORMAT may not be zero. Formats s and i are not supported at this level.
230 This is how the elements of an array or structure are printed
234 print_scalar_formatted (valaddr, type, format, size, stream)
242 int len = TYPE_LENGTH (type);
244 if (size == 'g' && sizeof (LONGEST) < 8
247 /* ok, we're going to have to get fancy here. Assumption: a
248 long is four bytes. FIXME. */
249 unsigned long v1, v2, tmp;
251 v1 = unpack_long (builtin_type_long, valaddr);
252 v2 = unpack_long (builtin_type_long, valaddr + 4);
254 #if TARGET_BYTE_ORDER == LITTLE_ENDIAN
255 /* Swap the two for printing */
264 fprintf_filtered (stream, "0x%08x%08x", v1, v2);
267 error ("Output size \"g\" unimplemented for format \"%c\".",
273 val_long = unpack_long (type, valaddr);
275 /* If value is unsigned, truncate it in case negative. */
278 if (len == sizeof (char))
279 val_long &= (1 << 8 * sizeof(char)) - 1;
280 else if (len == sizeof (short))
281 val_long &= (1 << 8 * sizeof(short)) - 1;
282 else if (len == sizeof (long))
283 val_long &= (unsigned long) - 1;
291 /* no size specified, like in print. Print varying # of digits. */
292 #if defined (LONG_LONG)
293 fprintf_filtered (stream, "0x%llx", val_long);
294 #else /* not LONG_LONG. */
295 fprintf_filtered (stream, "0x%lx", val_long);
296 #endif /* not LONG_LONG. */
299 #if defined (LONG_LONG)
303 fprintf_filtered (stream, "0x%02llx", val_long);
306 fprintf_filtered (stream, "0x%04llx", val_long);
309 fprintf_filtered (stream, "0x%08llx", val_long);
312 fprintf_filtered (stream, "0x%016llx", val_long);
315 error ("Undefined output size \"%c\".", size);
317 #else /* not LONG_LONG. */
321 fprintf_filtered (stream, "0x%02x", val_long);
324 fprintf_filtered (stream, "0x%04x", val_long);
327 fprintf_filtered (stream, "0x%08x", val_long);
330 fprintf_filtered (stream, "0x%016x", val_long);
333 error ("Undefined output size \"%c\".", size);
335 #endif /* not LONG_LONG */
340 fprintf_filtered (stream, "%lld", val_long);
342 fprintf_filtered (stream, "%d", val_long);
348 fprintf_filtered (stream, "%llu", val_long);
350 fprintf_filtered (stream, "%u", val_long);
357 fprintf_filtered (stream, "0%llo", val_long);
359 fprintf_filtered (stream, "0%o", val_long);
362 fprintf_filtered (stream, "0");
366 print_address ((CORE_ADDR) val_long, stream);
370 value_print (value_from_long (builtin_type_char, val_long), stream, 0,
375 if (len == sizeof (float))
376 type = builtin_type_float;
377 else if (len == sizeof (double))
378 type = builtin_type_double;
379 print_floating (valaddr, type, stream);
386 /* Binary; 't' stands for "two". */
388 char bits[8*(sizeof val_long) + 1];
393 width = 8*(sizeof val_long);
410 error ("Undefined output size \"%c\".", size);
416 bits[width] = (val_long & 1) ? '1' : '0';
421 while (*cp && *cp == '0')
426 fprintf_filtered (stream, cp);
431 error ("Undefined output format \"%c\".", format);
435 /* Specify default address for `x' command.
436 `info lines' uses this. */
439 set_next_address (addr)
444 /* Make address available to the user as $_. */
445 set_internalvar (lookup_internalvar ("_"),
446 value_from_long (builtin_type_int, (LONGEST) addr));
449 /* Optionally print address ADDR symbolically as <SYMBOL+OFFSET> on STREAM.
450 DO_DEMANGLE controls whether to print a symbol in its native "raw" form,
451 or to interpret it as a possible C++ name and convert it back to source
455 print_address_symbolic (addr, stream, do_demangle)
461 register int i = find_pc_misc_function (addr);
463 /* If nothing comes out, don't print anything symbolic. */
468 fputs_filtered (" <", stream);
470 fputs_demangled (misc_function_vector[i].name, stream, 1);
472 fputs_filtered (misc_function_vector[i].name, stream);
473 name_location = misc_function_vector[i].address;
474 if (addr - name_location)
475 fprintf_filtered (stream, "+%d>", addr - name_location);
477 fputs_filtered (">", stream);
480 /* Print address ADDR symbolically on STREAM.
481 First print it as a number. Then perhaps print
482 <SYMBOL + OFFSET> after the number. */
485 print_address (addr, stream)
489 fprintf_filtered (stream, "0x%x", addr);
490 print_address_symbolic (addr, stream, asm_demangle);
493 /* Print address ADDR symbolically on STREAM. Parameter DEMANGLE
494 controls whether to print the symbolic name "raw" or demangled. */
497 print_address_demangle (addr, stream, do_demangle)
502 fprintf_filtered (stream, "0x%x", addr);
503 print_address_symbolic (addr, stream, do_demangle);
508 /* Examine data at address ADDR in format FMT.
509 Fetch it from memory and print on stdout. */
512 do_examine (fmt, addr)
513 struct format_data fmt;
516 register char format = 0;
518 register int count = 1;
519 struct type *val_type;
521 register int maxelts;
528 /* String or instruction format implies fetch single bytes
529 regardless of the specified size. */
530 if (format == 's' || format == 'i')
534 val_type = builtin_type_char;
535 else if (size == 'h')
536 val_type = builtin_type_short;
537 else if (size == 'w')
538 val_type = builtin_type_long;
539 else if (size == 'g')
541 val_type = builtin_type_double;
543 val_type = builtin_type_long_long;
551 if (format == 's' || format == 'i')
554 /* Print as many objects as specified in COUNT, at most maxelts per line,
555 with the address of the next one at the start of each line. */
559 print_address (next_address, stdout);
560 printf_filtered (":");
565 printf_filtered ("\t");
566 /* Note that print_formatted sets next_address for the next
568 last_examine_address = next_address;
569 last_examine_value = value_at (val_type, next_address);
570 print_formatted (last_examine_value, format, size);
572 printf_filtered ("\n");
578 validate_format (fmt, cmdname)
579 struct format_data fmt;
583 error ("Size letters are meaningless in \"%s\" command.", cmdname);
585 error ("Item count other than 1 is meaningless in \"%s\" command.",
587 if (fmt.format == 'i' || fmt.format == 's')
588 error ("Format letter \"%c\" is meaningless in \"%s\" command.",
589 fmt.format, cmdname);
593 print_command_1 (exp, inspect, voidprint)
598 struct expression *expr;
599 register struct cleanup *old_chain = 0;
600 register char format = 0;
602 struct format_data fmt;
605 /* Pass inspect flag to the rest of the print routines in a global (sigh). */
606 inspect_it = inspect;
608 if (exp && *exp == '/')
611 fmt = decode_format (&exp, last_format, 0);
612 validate_format (fmt, "print");
613 last_format = format = fmt.format;
624 expr = parse_c_expression (exp);
625 old_chain = make_cleanup (free_current_contents, &expr);
627 val = evaluate_expression (expr);
630 val = access_value_history (0);
632 if (voidprint || (val && VALUE_TYPE (val) &&
633 TYPE_CODE (VALUE_TYPE (val)) != TYPE_CODE_VOID))
635 int histindex = record_latest_value (val);
638 printf ("\031(gdb-makebuffer \"%s\" %d '(\"", exp, histindex);
640 if (histindex >= 0) printf_filtered ("$%d = ", histindex);
642 print_formatted (val, format, fmt.size);
643 printf_filtered ("\n");
649 do_cleanups (old_chain);
650 inspect_it = 0; /* Reset print routines to normal */
654 print_command (exp, from_tty)
658 print_command_1 (exp, 0, 1);
661 /* Same as print, except in epoch, it gets its own window */
663 inspect_command (exp, from_tty)
667 extern int epoch_interface;
669 print_command_1 (exp, epoch_interface, 1);
672 /* Same as print, except it doesn't print void results. */
674 call_command (exp, from_tty)
678 print_command_1 (exp, 0, 0);
682 output_command (exp, from_tty)
686 struct expression *expr;
687 register struct cleanup *old_chain;
688 register char format = 0;
690 struct format_data fmt;
692 if (exp && *exp == '/')
695 fmt = decode_format (&exp, 0, 0);
696 validate_format (fmt, "print");
700 expr = parse_c_expression (exp);
701 old_chain = make_cleanup (free_current_contents, &expr);
703 val = evaluate_expression (expr);
705 print_formatted (val, format, fmt.size);
707 do_cleanups (old_chain);
711 set_command (exp, from_tty)
715 struct expression *expr = parse_c_expression (exp);
716 register struct cleanup *old_chain
717 = make_cleanup (free_current_contents, &expr);
718 evaluate_expression (expr);
719 do_cleanups (old_chain);
723 address_info (exp, from_tty)
727 register struct symbol *sym;
728 register CORE_ADDR val;
729 int is_a_field_of_this; /* C++: lookup_symbol sets this to nonzero
730 if exp is a field of `this'. */
733 error ("Argument required.");
735 sym = lookup_symbol (exp, get_selected_block (), VAR_NAMESPACE,
736 &is_a_field_of_this, (struct symtab **)NULL);
741 if (is_a_field_of_this)
743 printf ("Symbol \"%s\" is a field of the local class variable `this'\n", exp);
747 for (i = 0; i < misc_function_count; i++)
748 if (!strcmp (misc_function_vector[i].name, exp))
751 if (i < misc_function_count)
752 printf ("Symbol \"%s\" is at 0x%x in a file compiled without -g.\n",
753 exp, misc_function_vector[i].address);
755 error ("No symbol \"%s\" in current context.", exp);
759 printf ("Symbol \"%s\" is ", SYMBOL_NAME (sym));
760 val = SYMBOL_VALUE (sym);
762 switch (SYMBOL_CLASS (sym))
765 case LOC_CONST_BYTES:
770 printf ("a label at address 0x%x", SYMBOL_VALUE_ADDRESS (sym));
774 printf ("a variable in register %s", reg_names[val]);
778 printf ("static at address 0x%x", SYMBOL_VALUE_ADDRESS (sym));
782 printf ("an argument in register %s", reg_names[val]);
786 printf ("an argument at offset %d", (int)val);
790 printf ("an argument at frame offset %d", (int)val);
794 printf ("a local variable at frame offset %d", (int)val);
798 printf ("a reference argument at offset %d", (int)val);
802 printf ("a typedef");
806 printf ("a function at address 0x%x",
807 BLOCK_START (SYMBOL_BLOCK_VALUE (sym)));
811 printf ("an external symbol at address 0x%x",
812 SYMBOL_VALUE_ADDRESS (sym));
816 printf ("of unknown (botched) type");
823 x_command (exp, from_tty)
827 struct expression *expr;
828 struct format_data fmt;
829 struct cleanup *old_chain;
832 fmt.format = last_format;
833 fmt.size = last_size;
836 if (exp && *exp == '/')
839 fmt = decode_format (&exp, last_format, last_size);
840 last_size = fmt.size;
841 last_format = fmt.format;
844 /* If we have an expression, evaluate it and use it as the address. */
846 if (exp != 0 && *exp != 0)
848 expr = parse_c_expression (exp);
849 /* Cause expression not to be there any more
850 if this command is repeated with Newline.
851 But don't clobber a user-defined command's definition. */
854 old_chain = make_cleanup (free_current_contents, &expr);
855 val = evaluate_expression (expr);
856 /* In rvalue contexts, such as this, functions are coerced into
857 pointers to functions. This makes "x/i main" work. */
858 if (/* last_format == 'i'
859 && */ TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC
860 && VALUE_LVAL (val) == lval_memory)
861 next_address = VALUE_ADDRESS (val);
863 next_address = (CORE_ADDR) value_as_long (val);
864 do_cleanups (old_chain);
867 do_examine (fmt, next_address);
869 /* Set a couple of internal variables if appropriate. */
870 if (last_examine_value)
872 /* Make last address examined available to the user as $_. */
873 set_internalvar (lookup_internalvar ("_"),
874 value_from_long (builtin_type_int,
875 (LONGEST) last_examine_address));
877 /* Make contents of last address examined available to the user as $__.*/
878 set_internalvar (lookup_internalvar ("__"), last_examine_value);
882 /* Commands for printing types of things. */
884 /* Print type of EXP, or last thing in value history if EXP == NULL.
885 show is passed to type_print. */
887 whatis_exp (exp, show)
891 struct expression *expr;
893 register struct cleanup *old_chain;
897 expr = parse_c_expression (exp);
898 old_chain = make_cleanup (free_current_contents, &expr);
899 val = evaluate_type (expr);
902 val = access_value_history (0);
904 printf_filtered ("type = ");
905 type_print (VALUE_TYPE (val), "", stdout, show);
906 printf_filtered ("\n");
909 do_cleanups (old_chain);
913 whatis_command (exp, from_tty)
917 /* Most of the time users do not want to see all the fields
918 in a structure. If they do they can use the "ptype" command.
919 Hence the "-1" below. */
920 whatis_exp (exp, -1);
923 /* TYPENAME is either the name of a type, or an expression. */
925 ptype_command (typename, from_tty)
929 register char *p = typename;
931 register struct block *b
932 = target_has_stack ? get_current_block () : 0;
933 register struct type *type;
937 whatis_exp (typename, 1);
941 while (*p && *p != ' ' && *p != '\t') p++;
943 while (*p == ' ' || *p == '\t') p++;
945 if (len == 6 && !strncmp (typename, "struct", 6))
946 type = lookup_struct (p, b);
947 else if (len == 5 && !strncmp (typename, "union", 5))
948 type = lookup_union (p, b);
949 else if (len == 4 && !strncmp (typename, "enum", 4))
950 type = lookup_enum (p, b);
953 type = lookup_typename (typename, b, 1);
956 register struct symbol *sym
957 = lookup_symbol (typename, b, STRUCT_NAMESPACE, 0,
958 (struct symtab **)NULL);
961 whatis_exp (typename, 1 /* FIXME: right? */);
964 printf_filtered ("No type named %s, but there is a ",
966 switch (TYPE_CODE (SYMBOL_TYPE (sym)))
968 case TYPE_CODE_STRUCT:
969 printf_filtered ("struct");
972 case TYPE_CODE_UNION:
973 printf_filtered ("union");
977 printf_filtered ("enum");
981 printf_filtered ("(Internal error in gdb)");
984 printf_filtered (" %s. Type \"help ptype\".\n", typename);
985 type = SYMBOL_TYPE (sym);
989 type_print (type, "", stdout, 1);
990 printf_filtered ("\n");
994 /* This is not necessary. Instead, decode_line_1 takes any variable,
995 so "info line foo" is a close equivalent to "whereis foo". */
997 whereis_command (var, from_tty)
1005 error_no_arg ("Variable name.");
1007 sym = lookup_symbol (var, get_selected_block (), VAR_NAMESPACE,
1010 if (sym != NULL && s != NULL)
1011 printf_filtered ("Symbol \"%s\" is at line %d of file %s\n",
1012 var, sym->line, s->filename);
1015 if (lookup_misc_func (var) >= 0)
1016 printf_filtered ("Symbol \"%s\" is in a file compiled without -g.",
1019 error ("No symbol \"%s\" in current context.", var);
1024 enum display_status {disabled, enabled};
1028 /* Chain link to next auto-display item. */
1029 struct display *next;
1030 /* Expression to be evaluated and displayed. */
1031 struct expression *exp;
1032 /* Item number of this auto-display item. */
1034 /* Display format specified. */
1035 struct format_data format;
1036 /* Innermost block required by this expression when evaluated */
1037 struct block *block;
1038 /* Status of this display (enabled or disabled) */
1039 enum display_status status;
1042 /* Chain of expressions whose values should be displayed
1043 automatically each time the program stops. */
1045 static struct display *display_chain;
1047 static int display_number;
1049 /* Add an expression to the auto-display chain.
1050 Specify the expression. */
1053 display_command (exp, from_tty)
1057 struct format_data fmt;
1058 register struct expression *expr;
1059 register struct display *new;
1070 fmt = decode_format (&exp, 0, 0);
1071 if (fmt.size && fmt.format == 0)
1073 if (fmt.format == 'i' || fmt.format == 's')
1083 innermost_block = 0;
1084 expr = parse_c_expression (exp);
1086 new = (struct display *) xmalloc (sizeof (struct display));
1089 new->block = innermost_block;
1090 new->next = display_chain;
1091 new->number = ++display_number;
1093 new->status = enabled;
1094 display_chain = new;
1096 if (from_tty && target_has_execution)
1097 do_one_display (new);
1110 /* Clear out the display_chain.
1111 Done when new symtabs are loaded, since this invalidates
1112 the types stored in many expressions. */
1117 register struct display *d;
1119 while (d = display_chain)
1122 display_chain = d->next;
1127 /* Delete the auto-display number NUM. */
1130 delete_display (num)
1133 register struct display *d1, *d;
1136 error ("No display number %d.", num);
1138 if (display_chain->number == num)
1141 display_chain = d1->next;
1145 for (d = display_chain; ; d = d->next)
1148 error ("No display number %d.", num);
1149 if (d->next->number == num)
1159 /* Delete some values from the auto-display chain.
1160 Specify the element numbers. */
1163 undisplay_command (args)
1166 register char *p = args;
1172 if (query ("Delete all auto-display expressions? "))
1181 while (*p1 >= '0' && *p1 <= '9') p1++;
1182 if (*p1 && *p1 != ' ' && *p1 != '\t')
1183 error ("Arguments must be display numbers.");
1187 delete_display (num);
1190 while (*p == ' ' || *p == '\t') p++;
1195 /* Display a single auto-display.
1196 Do nothing if the display cannot be printed in the current context,
1197 or if the display is disabled. */
1203 int within_current_scope;
1205 if (d->status == disabled)
1209 within_current_scope = contained_in (get_selected_block (), d->block);
1211 within_current_scope = 1;
1212 if (!within_current_scope)
1215 current_display_number = d->number;
1217 printf_filtered ("%d: ", d->number);
1222 printf_filtered ("x/");
1223 if (d->format.count != 1)
1224 printf_filtered ("%d", d->format.count);
1225 printf_filtered ("%c", d->format.format);
1226 if (d->format.format != 'i' && d->format.format != 's')
1227 printf_filtered ("%c", d->format.size);
1228 printf_filtered (" ");
1229 print_expression (d->exp, stdout);
1230 if (d->format.count != 1)
1231 printf_filtered ("\n");
1233 printf_filtered (" ");
1235 addr = (CORE_ADDR) value_as_long (evaluate_expression (d->exp));
1236 if (d->format.format == 'i')
1237 addr = ADDR_BITS_REMOVE (addr);
1239 do_examine (d->format, addr);
1243 if (d->format.format)
1244 printf_filtered ("/%c ", d->format.format);
1245 print_expression (d->exp, stdout);
1246 printf_filtered (" = ");
1247 print_formatted (evaluate_expression (d->exp),
1248 d->format.format, d->format.size);
1249 printf_filtered ("\n");
1253 current_display_number = -1;
1256 /* Display all of the values on the auto-display chain which can be
1257 evaluated in the current scope. */
1262 register struct display *d;
1264 for (d = display_chain; d; d = d->next)
1268 /* Delete the auto-display which we were in the process of displaying.
1269 This is done when there is an error or a signal. */
1272 disable_display (num)
1275 register struct display *d;
1277 for (d = display_chain; d; d = d->next)
1278 if (d->number == num)
1280 d->status = disabled;
1283 printf ("No display number %d.\n", num);
1287 disable_current_display ()
1289 if (current_display_number >= 0)
1291 disable_display (current_display_number);
1292 fprintf (stderr, "Disabling display %d to avoid infinite recursion.\n",
1293 current_display_number);
1295 current_display_number = -1;
1301 register struct display *d;
1304 printf ("There are no auto-display expressions now.\n");
1306 printf_filtered ("Auto-display expressions now in effect:\n\
1307 Num Enb Expression\n");
1309 for (d = display_chain; d; d = d->next)
1311 printf_filtered ("%d: %c ", d->number, "ny"[(int)d->status]);
1313 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
1315 else if (d->format.format)
1316 printf_filtered ("/%c ", d->format.format);
1317 print_expression (d->exp, stdout);
1318 if (d->block && !contained_in (get_selected_block (), d->block))
1319 printf_filtered (" (cannot be evaluated in the current context)");
1320 printf_filtered ("\n");
1326 enable_display (args)
1329 register char *p = args;
1332 register struct display *d;
1336 for (d = display_chain; d; d = d->next)
1337 d->status = enabled;
1343 while (*p1 >= '0' && *p1 <= '9')
1345 if (*p1 && *p1 != ' ' && *p1 != '\t')
1346 error ("Arguments must be display numbers.");
1350 for (d = display_chain; d; d = d->next)
1351 if (d->number == num)
1353 d->status = enabled;
1356 printf ("No display number %d.\n", num);
1359 while (*p == ' ' || *p == '\t')
1365 disable_display_command (args, from_tty)
1369 register char *p = args;
1371 register struct display *d;
1375 for (d = display_chain; d; d = d->next)
1376 d->status = disabled;
1382 while (*p1 >= '0' && *p1 <= '9')
1384 if (*p1 && *p1 != ' ' && *p1 != '\t')
1385 error ("Arguments must be display numbers.");
1387 disable_display (atoi (p));
1390 while (*p == ' ' || *p == '\t')
1396 /* Print the value in stack frame FRAME of a variable
1397 specified by a struct symbol. */
1400 print_variable_value (var, frame, stream)
1405 value val = read_var_value (var, frame);
1406 value_print (val, stream, 0, Val_pretty_default);
1409 /* Print the arguments of a stack frame, given the function FUNC
1410 running in that frame (as a symbol), the info on the frame,
1411 and the number of args according to the stack frame (or -1 if unknown). */
1413 /* References here and elsewhere to "number of args according to the
1414 stack frame" appear in all cases to refer to "number of ints of args
1415 according to the stack frame". At least for VAX, i386, isi. */
1418 print_frame_args (func, fi, num, stream)
1419 struct symbol *func;
1420 struct frame_info *fi;
1428 register struct symbol *sym;
1430 /* Offset of next stack argument beyond the one we have seen that is
1431 at the highest offset.
1432 -1 if we haven't come to a stack argument yet. */
1433 int highest_offset = -1;
1435 /* Number of ints of arguments that we have printed so far. */
1436 int args_printed = 0;
1440 b = SYMBOL_BLOCK_VALUE (func);
1441 nsyms = BLOCK_NSYMS (b);
1444 for (i = 0; i < nsyms; i++)
1447 sym = BLOCK_SYM (b, i);
1449 if (SYMBOL_CLASS (sym) != LOC_REGPARM
1450 && SYMBOL_CLASS (sym) != LOC_ARG
1451 && SYMBOL_CLASS (sym) != LOC_LOCAL_ARG
1452 && SYMBOL_CLASS (sym) != LOC_REF_ARG)
1455 /* We have to re-look-up the symbol because arguments often have
1456 two entries (one a parameter, one a register or local), and the one
1457 we want is the non-parm, which lookup_symbol will find for
1458 us. After this, sym could be any SYMBOL_CLASS... */
1459 sym = lookup_symbol (SYMBOL_NAME (sym),
1460 b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL);
1462 switch (SYMBOL_CLASS (sym)) {
1464 /* Keep track of the highest stack argument offset seen */
1468 int current_offset = SYMBOL_VALUE (sym);
1470 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
1472 /* Compute address of next argument by adding the size of
1473 this argument and rounding to an int boundary. */
1475 = ((current_offset + arg_size + sizeof (int) - 1)
1476 & ~(sizeof (int) - 1));
1478 /* If this is the highest offset seen yet, set highest_offset. */
1479 if (highest_offset == -1
1480 || (current_offset > highest_offset))
1481 highest_offset = current_offset;
1483 /* Add the number of ints we're about to print to args_printed. */
1484 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
1487 /* Other types of symbols don't need to be kept track of. */
1492 /* Print the current arg. */
1494 fprintf_filtered (stream, ", ");
1496 fprint_symbol (stream, SYMBOL_NAME (sym));
1497 fputs_filtered ("=", stream);
1499 /* Avoid value_print because it will deref ref parameters. We just
1500 want to print their addresses. Print ??? for args whose address
1502 val = read_var_value (sym, FRAME_INFO_ID (fi));
1504 val_print (VALUE_TYPE (val), VALUE_CONTENTS (val), VALUE_ADDRESS (val),
1505 stream, 0, 0, 0, Val_no_prettyprint);
1507 fputs_filtered ("???", stream);
1511 /* Don't print nameless args in situations where we don't know
1512 enough about the stack to find them. */
1518 if (highest_offset == -1)
1519 start = FRAME_ARGS_SKIP;
1521 start = highest_offset;
1523 addr = FRAME_ARGS_ADDRESS (fi);
1525 print_frame_nameless_args (addr, start, num - args_printed,
1530 /* Print nameless args on STREAM.
1531 ARGSADDR is the address of the arglist, START is the offset
1532 of the first nameless arg, and NUM is the number of nameless args to
1533 print. FIRST is nonzero if this is the first argument (not just
1534 the first nameless arg). */
1536 print_frame_nameless_args (argsaddr, start, num, first, stream)
1544 for (i = 0; i < num; i++)
1548 fprintf_filtered (stream, ", ");
1549 #ifndef PRINT_TYPELESS_INTEGER
1550 fprintf_filtered (stream, "%d",
1551 read_memory_integer (argsaddr + start, sizeof (int)));
1553 PRINT_TYPELESS_INTEGER (stream, builtin_type_int,
1555 read_memory_integer (argsaddr + start,
1559 start += sizeof (int);
1564 printf_command (arg, from_tty)
1569 register char *s = arg;
1573 int allocated_args = 20;
1576 val_args = (value *) xmalloc (allocated_args * sizeof (value));
1579 error_no_arg ("format-control string and values to print");
1581 /* Skip white space before format string */
1582 while (*s == ' ' || *s == '\t') s++;
1584 /* A format string should follow, enveloped in double quotes */
1586 error ("Bad format string, missing '\"'.");
1588 /* Parse the format-control string and copy it into the string STRING,
1589 processing some kinds of escape sequence. */
1591 f = string = (char *) alloca (strlen (s) + 1);
1598 error ("Bad format string, non-terminated '\"'.");
1599 /* doesn't return */
1620 /* ??? TODO: handle other escape sequences */
1621 error ("Unrecognized \\ escape character in format string.");
1630 /* Skip over " and following space and comma. */
1633 while (*s == ' ' || *s == '\t') s++;
1635 if (*s != ',' && *s != 0)
1636 error ("Invalid argument syntax");
1639 while (*s == ' ' || *s == '\t') s++;
1642 /* Now scan the string for %-specs and see what kinds of args they want.
1643 argclass[I] classifies the %-specs so we can give vprintf something
1644 of the right size. */
1646 enum argclass {int_arg, string_arg, double_arg, long_long_arg};
1647 enum argclass *argclass;
1653 argclass = (enum argclass *) alloca (strlen (s) * sizeof *argclass);
1660 while (strchr ("0123456789.hlL-+ #", *f))
1662 if (*f == 'l' || *f == 'L')
1667 argclass[nargs_wanted++] = string_arg;
1668 else if (*f == 'e' || *f == 'f' || *f == 'g')
1669 argclass[nargs_wanted++] = double_arg;
1670 else if (lcount > 1)
1671 argclass[nargs_wanted++] = long_long_arg;
1673 argclass[nargs_wanted++] = int_arg;
1677 /* Now, parse all arguments and evaluate them.
1678 Store the VALUEs in VAL_ARGS. */
1683 if (nargs == allocated_args)
1684 val_args = (value *) xrealloc (val_args,
1685 (allocated_args *= 2)
1688 val_args[nargs] = parse_to_comma_and_eval (&s1);
1690 /* If format string wants a float, unchecked-convert the value to
1691 floating point of the same size */
1693 if (argclass[nargs] == double_arg)
1695 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (float))
1696 VALUE_TYPE (val_args[nargs]) = builtin_type_float;
1697 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (double))
1698 VALUE_TYPE (val_args[nargs]) = builtin_type_double;
1706 if (nargs != nargs_wanted)
1707 error ("Wrong number of arguments for specified format-string");
1709 /* Now lay out an argument-list containing the arguments
1710 as doubles, integers and C pointers. */
1712 arg_bytes = (char *) alloca (sizeof (double) * nargs);
1714 for (i = 0; i < nargs; i++)
1716 if (argclass[i] == string_arg)
1720 tem = value_as_long (val_args[i]);
1722 /* This is a %s argument. Find the length of the string. */
1727 read_memory (tem + j, &c, 1);
1732 /* Copy the string contents into a string inside GDB. */
1733 str = (char *) alloca (j + 1);
1734 read_memory (tem, str, j);
1737 /* Pass address of internal copy as the arg to vprintf. */
1738 *((int *) &arg_bytes[argindex]) = (int) str;
1739 argindex += sizeof (int);
1741 else if (VALUE_TYPE (val_args[i])->code == TYPE_CODE_FLT)
1743 *((double *) &arg_bytes[argindex]) = value_as_double (val_args[i]);
1744 argindex += sizeof (double);
1748 if (argclass[i] == long_long_arg)
1750 *(long long *) &arg_bytes[argindex] = value_as_long (val_args[i]);
1751 argindex += sizeof (long long);
1756 *((int *) &arg_bytes[argindex]) = value_as_long (val_args[i]);
1757 argindex += sizeof (int);
1762 /* There is not a standard way to make a va_list, so we need
1763 to do various things for different systems. */
1764 #if defined (__INT_VARARGS_H)
1769 list.__va_stk = (int *) arg_bytes;
1770 list.__va_reg = (int *) arg_bytes;
1771 vprintf (string, list);
1773 #else /* No __INT_VARARGS_H. */
1774 vprintf (string, arg_bytes);
1775 #endif /* No __INT_VARARGS_H. */
1778 /* Helper function for asdump_command. Finds the bounds of a function
1779 for a specified section of text. PC is an address within the
1780 function which you want bounds for; *LOW and *HIGH are set to the
1781 beginning (inclusive) and end (exclusive) of the function. This
1782 function returns 1 on success and 0 on failure. */
1785 containing_function_bounds (pc, low, high)
1786 CORE_ADDR pc, *low, *high;
1790 if (!find_pc_partial_function (pc, 0, low))
1796 if (!find_pc_partial_function (scan, 0, high))
1798 } while (*low == *high);
1803 /* Dump a specified section of assembly code. With no command line
1804 arguments, this command will dump the assembly code for the
1805 function surrounding the pc value in the selected frame. With one
1806 argument, it will dump the assembly code surrounding that pc value.
1807 Two arguments are interpeted as bounds within which to dump
1811 disassemble_command (arg, from_tty)
1815 CORE_ADDR low, high;
1821 if (!selected_frame)
1822 error ("No frame selected.\n");
1824 pc = get_frame_pc (selected_frame);
1825 if (!containing_function_bounds (pc, &low, &high))
1826 error ("No function contains pc specified by selected frame.\n");
1828 else if (!(space_index = (char *) strchr (arg, ' ')))
1831 pc = parse_and_eval_address (arg);
1832 if (!containing_function_bounds (pc, &low, &high))
1833 error ("No function contains specified pc.\n");
1837 /* Two arguments. */
1838 *space_index = '\0';
1839 low = parse_and_eval_address (arg);
1840 high = parse_and_eval_address (space_index + 1);
1843 printf_filtered ("Dump of assembler code ");
1847 find_pc_partial_function (pc, &name, 0);
1848 printf_filtered ("for function %s:\n", name);
1851 printf_filtered ("from 0x%x to 0x%x:\n", low, high);
1853 /* Dump the specified range. */
1854 for (pc = low; pc < high; )
1857 print_address (pc, stdout);
1858 printf_filtered (":\t");
1859 pc += print_insn (pc, stdout);
1860 printf_filtered ("\n");
1862 printf_filtered ("End of assembler dump.\n");
1868 _initialize_printcmd ()
1870 current_display_number = -1;
1872 add_info ("address", address_info,
1873 "Describe where variable VAR is stored.");
1875 add_com ("x", class_vars, x_command,
1876 "Examine memory: x/FMT ADDRESS.\n\
1877 ADDRESS is an expression for the memory address to examine.\n\
1878 FMT is a repeat count followed by a format letter and a size letter.\n\
1879 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
1880 f(float), a(address), i(instruction), c(char) and s(string).\n\
1881 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
1882 g is meaningful only with f, for type double.\n\
1883 The specified number of objects of the specified size are printed\n\
1884 according to the format.\n\n\
1885 Defaults for format and size letters are those previously used.\n\
1886 Default count is 1. Default address is following last thing printed\n\
1887 with this command or \"print\".");
1889 add_com ("disassemble", class_vars, disassemble_command,
1890 "Disassemble a specified section of memory.\n\
1891 Default is the function surrounding the pc of the selected frame.\n\
1892 With a single argument, the function surrounding that address is dumped.\n\
1893 Two arguments are taken as a range of memory to dump.");
1895 add_com ("ptype", class_vars, ptype_command,
1896 "Print definition of type TYPE.\n\
1897 Argument may be a type name defined by typedef, or \"struct STRUCTNAME\"\n\
1898 or \"union UNIONNAME\" or \"enum ENUMNAME\".\n\
1899 The selected stack frame's lexical context is used to look up the name.");
1901 add_com ("whatis", class_vars, whatis_command,
1902 "Print data type of expression EXP.");
1905 add_com ("whereis", class_vars, whereis_command,
1906 "Print line number and file of definition of variable.");
1909 add_info ("display", display_info,
1910 "Expressions to display when program stops, with code numbers.");
1912 add_cmd ("undisplay", class_vars, undisplay_command,
1913 "Cancel some expressions to be displayed when program stops.\n\
1914 Arguments are the code numbers of the expressions to stop displaying.\n\
1915 No argument means cancel all automatic-display expressions.\n\
1916 \"delete display\" has the same effect as this command.\n\
1917 Do \"info display\" to see current list of code numbers.",
1920 add_com ("display", class_vars, display_command,
1921 "Print value of expression EXP each time the program stops.\n\
1922 /FMT may be used before EXP as in the \"print\" command.\n\
1923 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
1924 as in the \"x\" command, and then EXP is used to get the address to examine\n\
1925 and examining is done as in the \"x\" command.\n\n\
1926 With no argument, display all currently requested auto-display expressions.\n\
1927 Use \"undisplay\" to cancel display requests previously made.");
1929 add_cmd ("display", class_vars, enable_display,
1930 "Enable some expressions to be displayed when program stops.\n\
1931 Arguments are the code numbers of the expressions to resume displaying.\n\
1932 No argument means enable all automatic-display expressions.\n\
1933 Do \"info display\" to see current list of code numbers.", &enablelist);
1935 add_cmd ("display", class_vars, disable_display_command,
1936 "Disable some expressions to be displayed when program stops.\n\
1937 Arguments are the code numbers of the expressions to stop displaying.\n\
1938 No argument means disable all automatic-display expressions.\n\
1939 Do \"info display\" to see current list of code numbers.", &disablelist);
1941 add_cmd ("display", class_vars, undisplay_command,
1942 "Cancel some expressions to be displayed when program stops.\n\
1943 Arguments are the code numbers of the expressions to stop displaying.\n\
1944 No argument means cancel all automatic-display expressions.\n\
1945 Do \"info display\" to see current list of code numbers.", &deletelist);
1947 add_com ("printf", class_vars, printf_command,
1948 "printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
1949 This is useful for formatted output in user-defined commands.");
1950 add_com ("output", class_vars, output_command,
1951 "Like \"print\" but don't put in value history and don't print newline.\n\
1952 This is useful in user-defined commands.");
1954 add_prefix_cmd ("set", class_vars, set_command,
1955 "Perform an assignment VAR = EXP.\n\
1956 You must type the \"=\". VAR may be a debugger \"convenience\" variable\n\
1957 (names starting with $), a register (a few standard names starting with $),\n\
1958 or an actual variable in the program being debugged. EXP is any expression.\n\
1959 Use \"set variable\" for variables with names identical to set subcommands.\n\
1960 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
1961 You can see these environment settings with the \"show\" command.",
1962 &setlist, "set ", 1, &cmdlist);
1964 /* "call" is the same as "set", but handy for dbx users to call fns. */
1965 add_com ("call", class_vars, call_command,
1966 "Call a function in the inferior process.\n\
1967 The argument is the function name and arguments, in standard C notation.\n\
1968 The result is printed and saved in the value history, if it is not void.");
1970 add_cmd ("variable", class_vars, set_command,
1971 "Perform an assignment VAR = EXP.\n\
1972 You must type the \"=\". VAR may be a debugger \"convenience\" variable\n\
1973 (names starting with $), a register (a few standard names starting with $),\n\
1974 or an actual variable in the program being debugged. EXP is any expression.\n\
1975 This may usually be abbreviated to simply \"set\".",
1978 add_com ("print", class_vars, print_command,
1979 concat ("Print value of expression EXP.\n\
1980 Variables accessible are those of the lexical environment of the selected\n\
1981 stack frame, plus all those whose scope is global or an entire file.\n\
1983 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
1984 $$NUM refers to NUM'th value back from the last one.\n\
1985 Names starting with $ refer to registers (with the values they would have\n\
1986 if the program were to return to the stack frame now selected, restoring\n\
1987 all registers saved by frames farther in) or else to debugger\n\
1988 \"convenience\" variables (any such name not a known register).\n\
1989 Use assignment expressions to give values to convenience variables.\n",
1991 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
1992 @ is a binary operator for treating consecutive data objects\n\
1993 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
1994 element is FOO, whose second element is stored in the space following\n\
1995 where FOO is stored, etc. FOO must be an expression whose value\n\
1996 resides in memory.\n",
1998 EXP may be preceded with /FMT, where FMT is a format letter\n\
1999 but no count or size letter (see \"x\" command)."));
2000 add_com_alias ("p", "print", class_vars, 1);
2002 add_com ("inspect", class_vars, inspect_command,
2003 "Same as \"print\" command, except that if you are running in the epoch\n\
2004 environment, the value is printed in its own window.");