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 (unpack_pointer (type, valaddr), 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 extern int objectprint;
626 expr = parse_c_expression (exp);
627 old_chain = make_cleanup (free_current_contents, &expr);
629 val = evaluate_expression (expr);
631 /* C++: figure out what type we actually want to print it as. */
632 type = VALUE_TYPE (val);
635 && (TYPE_CODE (type) == TYPE_CODE_PTR
636 || TYPE_CODE (type) == TYPE_CODE_REF)
637 && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)
641 v = value_from_vtable_info (val, TYPE_TARGET_TYPE (type));
645 type = VALUE_TYPE (val);
650 val = access_value_history (0);
652 if (voidprint || (val && VALUE_TYPE (val) &&
653 TYPE_CODE (VALUE_TYPE (val)) != TYPE_CODE_VOID))
655 int histindex = record_latest_value (val);
658 printf ("\031(gdb-makebuffer \"%s\" %d '(\"", exp, histindex);
660 if (histindex >= 0) printf_filtered ("$%d = ", histindex);
662 print_formatted (val, format, fmt.size);
663 printf_filtered ("\n");
669 do_cleanups (old_chain);
670 inspect_it = 0; /* Reset print routines to normal */
675 print_command (exp, from_tty)
679 print_command_1 (exp, 0, 1);
682 /* Same as print, except in epoch, it gets its own window */
685 inspect_command (exp, from_tty)
689 extern int epoch_interface;
691 print_command_1 (exp, epoch_interface, 1);
694 /* Same as print, except it doesn't print void results. */
697 call_command (exp, from_tty)
701 print_command_1 (exp, 0, 0);
706 output_command (exp, from_tty)
710 struct expression *expr;
711 register struct cleanup *old_chain;
712 register char format = 0;
714 struct format_data fmt;
716 if (exp && *exp == '/')
719 fmt = decode_format (&exp, 0, 0);
720 validate_format (fmt, "print");
724 expr = parse_c_expression (exp);
725 old_chain = make_cleanup (free_current_contents, &expr);
727 val = evaluate_expression (expr);
729 print_formatted (val, format, fmt.size);
731 do_cleanups (old_chain);
736 set_command (exp, from_tty)
740 struct expression *expr = parse_c_expression (exp);
741 register struct cleanup *old_chain
742 = make_cleanup (free_current_contents, &expr);
743 evaluate_expression (expr);
744 do_cleanups (old_chain);
749 address_info (exp, from_tty)
753 register struct symbol *sym;
755 int is_a_field_of_this; /* C++: lookup_symbol sets this to nonzero
756 if exp is a field of `this'. */
759 error ("Argument required.");
761 sym = lookup_symbol (exp, get_selected_block (), VAR_NAMESPACE,
762 &is_a_field_of_this, (struct symtab **)NULL);
767 if (is_a_field_of_this)
769 printf ("Symbol \"%s\" is a field of the local class variable `this'\n", exp);
773 for (i = 0; i < misc_function_count; i++)
774 if (!strcmp (misc_function_vector[i].name, exp))
777 if (i < misc_function_count)
778 printf ("Symbol \"%s\" is at 0x%x in a file compiled without -g.\n",
779 exp, misc_function_vector[i].address);
781 error ("No symbol \"%s\" in current context.", exp);
785 printf ("Symbol \"%s\" is ", SYMBOL_NAME (sym));
786 val = SYMBOL_VALUE (sym);
788 switch (SYMBOL_CLASS (sym))
791 case LOC_CONST_BYTES:
796 printf ("a label at address 0x%x", SYMBOL_VALUE_ADDRESS (sym));
800 printf ("a variable in register %s", reg_names[val]);
804 printf ("static at address 0x%x", SYMBOL_VALUE_ADDRESS (sym));
808 printf ("an argument in register %s", reg_names[val]);
812 printf ("an argument at offset %ld", val);
816 printf ("an argument at frame offset %ld", val);
820 printf ("a local variable at frame offset %ld", val);
824 printf ("a reference argument at offset %ld", val);
828 printf ("a typedef");
832 printf ("a function at address 0x%x",
833 BLOCK_START (SYMBOL_BLOCK_VALUE (sym)));
837 printf ("an external symbol at address 0x%x",
838 SYMBOL_VALUE_ADDRESS (sym));
842 printf ("of unknown (botched) type");
849 x_command (exp, from_tty)
853 struct expression *expr;
854 struct format_data fmt;
855 struct cleanup *old_chain;
858 fmt.format = last_format;
859 fmt.size = last_size;
862 if (exp && *exp == '/')
865 fmt = decode_format (&exp, last_format, last_size);
866 last_size = fmt.size;
867 last_format = fmt.format;
870 /* If we have an expression, evaluate it and use it as the address. */
872 if (exp != 0 && *exp != 0)
874 expr = parse_c_expression (exp);
875 /* Cause expression not to be there any more
876 if this command is repeated with Newline.
877 But don't clobber a user-defined command's definition. */
880 old_chain = make_cleanup (free_current_contents, &expr);
881 val = evaluate_expression (expr);
882 if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_REF)
883 val = value_ind (val);
884 /* In rvalue contexts, such as this, functions are coerced into
885 pointers to functions. This makes "x/i main" work. */
886 if (/* last_format == 'i'
887 && */ TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC
888 && VALUE_LVAL (val) == lval_memory)
889 next_address = VALUE_ADDRESS (val);
891 next_address = value_as_pointer (val);
892 do_cleanups (old_chain);
895 do_examine (fmt, next_address);
897 /* Set a couple of internal variables if appropriate. */
898 if (last_examine_value)
900 /* Make last address examined available to the user as $_. */
901 set_internalvar (lookup_internalvar ("_"),
902 value_from_long (builtin_type_int,
903 (LONGEST) last_examine_address));
905 /* Make contents of last address examined available to the user as $__.*/
906 set_internalvar (lookup_internalvar ("__"), last_examine_value);
910 /* Commands for printing types of things. */
912 /* Print type of EXP, or last thing in value history if EXP == NULL.
913 show is passed to type_print. */
915 whatis_exp (exp, show)
919 struct expression *expr;
921 register struct cleanup *old_chain;
925 expr = parse_c_expression (exp);
926 old_chain = make_cleanup (free_current_contents, &expr);
927 val = evaluate_type (expr);
930 val = access_value_history (0);
932 printf_filtered ("type = ");
933 type_print (VALUE_TYPE (val), "", stdout, show);
934 printf_filtered ("\n");
937 do_cleanups (old_chain);
942 whatis_command (exp, from_tty)
946 /* Most of the time users do not want to see all the fields
947 in a structure. If they do they can use the "ptype" command.
948 Hence the "-1" below. */
949 whatis_exp (exp, -1);
952 /* TYPENAME is either the name of a type, or an expression. */
955 ptype_command (typename, from_tty)
959 register char *p = typename;
961 register struct block *b
962 = target_has_stack ? get_current_block () : 0;
963 register struct type *type;
967 whatis_exp (typename, 1);
971 while (*p && *p != ' ' && *p != '\t') p++;
973 while (*p == ' ' || *p == '\t') p++;
975 if (len == 6 && !strncmp (typename, "struct", 6))
976 type = lookup_struct (p, b);
977 else if (len == 5 && !strncmp (typename, "union", 5))
978 type = lookup_union (p, b);
979 else if (len == 4 && !strncmp (typename, "enum", 4))
980 type = lookup_enum (p, b);
983 type = lookup_typename (typename, b, 1);
986 register struct symbol *sym
987 = lookup_symbol (typename, b, STRUCT_NAMESPACE, 0,
988 (struct symtab **)NULL);
991 /* It's not the name of a type, either VAR_NAMESPACE
992 or STRUCT_NAMESPACE, so it must be an expression. */
993 whatis_exp (typename, 1);
996 printf_filtered ("No type named %s, but there is a ",
998 switch (TYPE_CODE (SYMBOL_TYPE (sym)))
1000 case TYPE_CODE_STRUCT:
1001 printf_filtered ("struct");
1004 case TYPE_CODE_UNION:
1005 printf_filtered ("union");
1008 case TYPE_CODE_ENUM:
1009 printf_filtered ("enum");
1013 printf_filtered ("(Internal error in gdb)");
1016 printf_filtered (" %s. Type \"help ptype\".\n", typename);
1017 type = SYMBOL_TYPE (sym);
1021 type_print (type, "", stdout, 1);
1022 printf_filtered ("\n");
1026 /* This is not necessary. Instead, decode_line_1 takes any variable,
1027 so "info line foo" is a close equivalent to "whereis foo". */
1029 whereis_command (var, from_tty)
1037 error_no_arg ("Variable name.");
1039 sym = lookup_symbol (var, get_selected_block (), VAR_NAMESPACE,
1042 if (sym != NULL && s != NULL)
1043 printf_filtered ("Symbol \"%s\" is at line %d of file %s\n",
1044 var, sym->line, s->filename);
1047 if (lookup_misc_func (var) >= 0)
1048 printf_filtered ("Symbol \"%s\" is in a file compiled without -g.",
1051 error ("No symbol \"%s\" in current context.", var);
1056 enum display_status {disabled, enabled};
1060 /* Chain link to next auto-display item. */
1061 struct display *next;
1062 /* Expression to be evaluated and displayed. */
1063 struct expression *exp;
1064 /* Item number of this auto-display item. */
1066 /* Display format specified. */
1067 struct format_data format;
1068 /* Innermost block required by this expression when evaluated */
1069 struct block *block;
1070 /* Status of this display (enabled or disabled) */
1071 enum display_status status;
1074 /* Chain of expressions whose values should be displayed
1075 automatically each time the program stops. */
1077 static struct display *display_chain;
1079 static int display_number;
1081 /* Add an expression to the auto-display chain.
1082 Specify the expression. */
1085 display_command (exp, from_tty)
1089 struct format_data fmt;
1090 register struct expression *expr;
1091 register struct display *new;
1102 fmt = decode_format (&exp, 0, 0);
1103 if (fmt.size && fmt.format == 0)
1105 if (fmt.format == 'i' || fmt.format == 's')
1115 innermost_block = 0;
1116 expr = parse_c_expression (exp);
1118 new = (struct display *) xmalloc (sizeof (struct display));
1121 new->block = innermost_block;
1122 new->next = display_chain;
1123 new->number = ++display_number;
1125 new->status = enabled;
1126 display_chain = new;
1128 if (from_tty && target_has_execution)
1129 do_one_display (new);
1142 /* Clear out the display_chain.
1143 Done when new symtabs are loaded, since this invalidates
1144 the types stored in many expressions. */
1149 register struct display *d;
1151 while (d = display_chain)
1154 display_chain = d->next;
1159 /* Delete the auto-display number NUM. */
1162 delete_display (num)
1165 register struct display *d1, *d;
1168 error ("No display number %d.", num);
1170 if (display_chain->number == num)
1173 display_chain = d1->next;
1177 for (d = display_chain; ; d = d->next)
1180 error ("No display number %d.", num);
1181 if (d->next->number == num)
1191 /* Delete some values from the auto-display chain.
1192 Specify the element numbers. */
1195 undisplay_command (args)
1198 register char *p = args;
1204 if (query ("Delete all auto-display expressions? "))
1213 while (*p1 >= '0' && *p1 <= '9') p1++;
1214 if (*p1 && *p1 != ' ' && *p1 != '\t')
1215 error ("Arguments must be display numbers.");
1219 delete_display (num);
1222 while (*p == ' ' || *p == '\t') p++;
1227 /* Display a single auto-display.
1228 Do nothing if the display cannot be printed in the current context,
1229 or if the display is disabled. */
1235 int within_current_scope;
1237 if (d->status == disabled)
1241 within_current_scope = contained_in (get_selected_block (), d->block);
1243 within_current_scope = 1;
1244 if (!within_current_scope)
1247 current_display_number = d->number;
1249 printf_filtered ("%d: ", d->number);
1254 printf_filtered ("x/");
1255 if (d->format.count != 1)
1256 printf_filtered ("%d", d->format.count);
1257 printf_filtered ("%c", d->format.format);
1258 if (d->format.format != 'i' && d->format.format != 's')
1259 printf_filtered ("%c", d->format.size);
1260 printf_filtered (" ");
1261 print_expression (d->exp, stdout);
1262 if (d->format.count != 1)
1263 printf_filtered ("\n");
1265 printf_filtered (" ");
1267 addr = value_as_pointer (evaluate_expression (d->exp));
1268 if (d->format.format == 'i')
1269 addr = ADDR_BITS_REMOVE (addr);
1271 do_examine (d->format, addr);
1275 if (d->format.format)
1276 printf_filtered ("/%c ", d->format.format);
1277 print_expression (d->exp, stdout);
1278 printf_filtered (" = ");
1279 print_formatted (evaluate_expression (d->exp),
1280 d->format.format, d->format.size);
1281 printf_filtered ("\n");
1285 current_display_number = -1;
1288 /* Display all of the values on the auto-display chain which can be
1289 evaluated in the current scope. */
1294 register struct display *d;
1296 for (d = display_chain; d; d = d->next)
1300 /* Delete the auto-display which we were in the process of displaying.
1301 This is done when there is an error or a signal. */
1304 disable_display (num)
1307 register struct display *d;
1309 for (d = display_chain; d; d = d->next)
1310 if (d->number == num)
1312 d->status = disabled;
1315 printf ("No display number %d.\n", num);
1319 disable_current_display ()
1321 if (current_display_number >= 0)
1323 disable_display (current_display_number);
1324 fprintf (stderr, "Disabling display %d to avoid infinite recursion.\n",
1325 current_display_number);
1327 current_display_number = -1;
1333 register struct display *d;
1336 printf ("There are no auto-display expressions now.\n");
1338 printf_filtered ("Auto-display expressions now in effect:\n\
1339 Num Enb Expression\n");
1341 for (d = display_chain; d; d = d->next)
1343 printf_filtered ("%d: %c ", d->number, "ny"[(int)d->status]);
1345 printf_filtered ("/%d%c%c ", d->format.count, d->format.size,
1347 else if (d->format.format)
1348 printf_filtered ("/%c ", d->format.format);
1349 print_expression (d->exp, stdout);
1350 if (d->block && !contained_in (get_selected_block (), d->block))
1351 printf_filtered (" (cannot be evaluated in the current context)");
1352 printf_filtered ("\n");
1358 enable_display (args)
1361 register char *p = args;
1364 register struct display *d;
1368 for (d = display_chain; d; d = d->next)
1369 d->status = enabled;
1375 while (*p1 >= '0' && *p1 <= '9')
1377 if (*p1 && *p1 != ' ' && *p1 != '\t')
1378 error ("Arguments must be display numbers.");
1382 for (d = display_chain; d; d = d->next)
1383 if (d->number == num)
1385 d->status = enabled;
1388 printf ("No display number %d.\n", num);
1391 while (*p == ' ' || *p == '\t')
1398 disable_display_command (args, from_tty)
1402 register char *p = args;
1404 register struct display *d;
1408 for (d = display_chain; d; d = d->next)
1409 d->status = disabled;
1415 while (*p1 >= '0' && *p1 <= '9')
1417 if (*p1 && *p1 != ' ' && *p1 != '\t')
1418 error ("Arguments must be display numbers.");
1420 disable_display (atoi (p));
1423 while (*p == ' ' || *p == '\t')
1429 /* Print the value in stack frame FRAME of a variable
1430 specified by a struct symbol. */
1433 print_variable_value (var, frame, stream)
1438 value val = read_var_value (var, frame);
1439 value_print (val, stream, 0, Val_pretty_default);
1442 /* Print the arguments of a stack frame, given the function FUNC
1443 running in that frame (as a symbol), the info on the frame,
1444 and the number of args according to the stack frame (or -1 if unknown). */
1446 /* References here and elsewhere to "number of args according to the
1447 stack frame" appear in all cases to refer to "number of ints of args
1448 according to the stack frame". At least for VAX, i386, isi. */
1451 print_frame_args (func, fi, num, stream)
1452 struct symbol *func;
1453 struct frame_info *fi;
1461 register struct symbol *sym;
1463 /* Offset of next stack argument beyond the one we have seen that is
1464 at the highest offset.
1465 -1 if we haven't come to a stack argument yet. */
1466 long highest_offset = -1;
1468 /* Number of ints of arguments that we have printed so far. */
1469 int args_printed = 0;
1473 b = SYMBOL_BLOCK_VALUE (func);
1474 nsyms = BLOCK_NSYMS (b);
1477 for (i = 0; i < nsyms; i++)
1480 sym = BLOCK_SYM (b, i);
1482 if (SYMBOL_CLASS (sym) != LOC_REGPARM
1483 && SYMBOL_CLASS (sym) != LOC_ARG
1484 && SYMBOL_CLASS (sym) != LOC_LOCAL_ARG
1485 && SYMBOL_CLASS (sym) != LOC_REF_ARG)
1488 /* We have to re-look-up the symbol because arguments often have
1489 two entries (one a parameter, one a register or local), and the one
1490 we want is the non-parm, which lookup_symbol will find for
1491 us. After this, sym could be any SYMBOL_CLASS... */
1492 sym = lookup_symbol (SYMBOL_NAME (sym),
1493 b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL);
1495 switch (SYMBOL_CLASS (sym)) {
1497 /* Keep track of the highest stack argument offset seen */
1501 long current_offset = SYMBOL_VALUE (sym);
1503 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
1505 /* Compute address of next argument by adding the size of
1506 this argument and rounding to an int boundary. */
1508 = ((current_offset + arg_size + sizeof (int) - 1)
1509 & ~(sizeof (int) - 1));
1511 /* If this is the highest offset seen yet, set highest_offset. */
1512 if (highest_offset == -1
1513 || (current_offset > highest_offset))
1514 highest_offset = current_offset;
1516 /* Add the number of ints we're about to print to args_printed. */
1517 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
1520 /* Other types of symbols don't need to be kept track of. */
1525 /* Print the current arg. */
1527 fprintf_filtered (stream, ", ");
1529 fprint_symbol (stream, SYMBOL_NAME (sym));
1530 fputs_filtered ("=", stream);
1532 /* Avoid value_print because it will deref ref parameters. We just
1533 want to print their addresses. Print ??? for args whose address
1535 val = read_var_value (sym, FRAME_INFO_ID (fi));
1537 val_print (VALUE_TYPE (val), VALUE_CONTENTS (val), VALUE_ADDRESS (val),
1538 stream, 0, 0, 0, Val_no_prettyprint);
1540 fputs_filtered ("???", stream);
1544 /* Don't print nameless args in situations where we don't know
1545 enough about the stack to find them. */
1551 if (highest_offset == -1)
1552 start = FRAME_ARGS_SKIP;
1554 start = highest_offset;
1556 addr = FRAME_ARGS_ADDRESS (fi);
1558 print_frame_nameless_args (addr, start, num - args_printed,
1563 /* Print nameless args on STREAM.
1564 ARGSADDR is the address of the arglist, START is the offset
1565 of the first nameless arg, and NUM is the number of nameless args to
1566 print. FIRST is nonzero if this is the first argument (not just
1567 the first nameless arg). */
1569 print_frame_nameless_args (argsaddr, start, num, first, stream)
1577 for (i = 0; i < num; i++)
1581 fprintf_filtered (stream, ", ");
1582 #ifndef PRINT_TYPELESS_INTEGER
1583 fprintf_filtered (stream, "%d",
1584 read_memory_integer (argsaddr + start, sizeof (int)));
1586 PRINT_TYPELESS_INTEGER (stream, builtin_type_int,
1588 read_memory_integer (argsaddr + start,
1592 start += sizeof (int);
1598 printf_command (arg, from_tty)
1603 register char *s = arg;
1607 int allocated_args = 20;
1610 val_args = (value *) xmalloc (allocated_args * sizeof (value));
1613 error_no_arg ("format-control string and values to print");
1615 /* Skip white space before format string */
1616 while (*s == ' ' || *s == '\t') s++;
1618 /* A format string should follow, enveloped in double quotes */
1620 error ("Bad format string, missing '\"'.");
1622 /* Parse the format-control string and copy it into the string STRING,
1623 processing some kinds of escape sequence. */
1625 f = string = (char *) alloca (strlen (s) + 1);
1632 error ("Bad format string, non-terminated '\"'.");
1633 /* doesn't return */
1654 /* ??? TODO: handle other escape sequences */
1655 error ("Unrecognized \\ escape character in format string.");
1664 /* Skip over " and following space and comma. */
1667 while (*s == ' ' || *s == '\t') s++;
1669 if (*s != ',' && *s != 0)
1670 error ("Invalid argument syntax");
1673 while (*s == ' ' || *s == '\t') s++;
1676 /* Now scan the string for %-specs and see what kinds of args they want.
1677 argclass[I] classifies the %-specs so we can give vprintf something
1678 of the right size. */
1680 enum argclass {int_arg, string_arg, double_arg, long_long_arg};
1681 enum argclass *argclass;
1687 argclass = (enum argclass *) alloca (strlen (s) * sizeof *argclass);
1694 while (strchr ("0123456789.hlL-+ #", *f))
1696 if (*f == 'l' || *f == 'L')
1701 argclass[nargs_wanted++] = string_arg;
1702 else if (*f == 'e' || *f == 'f' || *f == 'g')
1703 argclass[nargs_wanted++] = double_arg;
1704 else if (lcount > 1)
1705 argclass[nargs_wanted++] = long_long_arg;
1707 argclass[nargs_wanted++] = int_arg;
1711 /* Now, parse all arguments and evaluate them.
1712 Store the VALUEs in VAL_ARGS. */
1717 if (nargs == allocated_args)
1718 val_args = (value *) xrealloc (val_args,
1719 (allocated_args *= 2)
1722 val_args[nargs] = parse_to_comma_and_eval (&s1);
1724 /* If format string wants a float, unchecked-convert the value to
1725 floating point of the same size */
1727 if (argclass[nargs] == double_arg)
1729 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (float))
1730 VALUE_TYPE (val_args[nargs]) = builtin_type_float;
1731 if (TYPE_LENGTH (VALUE_TYPE (val_args[nargs])) == sizeof (double))
1732 VALUE_TYPE (val_args[nargs]) = builtin_type_double;
1740 if (nargs != nargs_wanted)
1741 error ("Wrong number of arguments for specified format-string");
1743 /* Now lay out an argument-list containing the arguments
1744 as doubles, integers and C pointers. */
1746 arg_bytes = (char *) alloca (sizeof (double) * nargs);
1748 for (i = 0; i < nargs; i++)
1750 if (argclass[i] == string_arg)
1755 tem = value_as_pointer (val_args[i]);
1757 /* This is a %s argument. Find the length of the string. */
1762 read_memory (tem + j, &c, 1);
1767 /* Copy the string contents into a string inside GDB. */
1768 str = (char *) alloca (j + 1);
1769 read_memory (tem, str, j);
1772 /* Pass address of internal copy as the arg to vprintf. */
1773 *((int *) &arg_bytes[argindex]) = (int) str;
1774 argindex += sizeof (int);
1776 else if (VALUE_TYPE (val_args[i])->code == TYPE_CODE_FLT)
1778 *((double *) &arg_bytes[argindex]) = value_as_double (val_args[i]);
1779 argindex += sizeof (double);
1783 if (argclass[i] == long_long_arg)
1785 *(long long *) &arg_bytes[argindex] = value_as_long (val_args[i]);
1786 argindex += sizeof (long long);
1791 *((long *) &arg_bytes[argindex]) = value_as_long (val_args[i]);
1792 argindex += sizeof (long);
1797 /* There is not a standard way to make a va_list, so we need
1798 to do various things for different systems. */
1799 #if defined (__INT_VARARGS_H)
1804 list.__va_stk = (int *) arg_bytes;
1805 list.__va_reg = (int *) arg_bytes;
1806 vprintf (string, list);
1808 #else /* No __INT_VARARGS_H. */
1809 vprintf (string, arg_bytes);
1810 #endif /* No __INT_VARARGS_H. */
1813 /* Helper function for asdump_command. Finds the bounds of a function
1814 for a specified section of text. PC is an address within the
1815 function which you want bounds for; *LOW and *HIGH are set to the
1816 beginning (inclusive) and end (exclusive) of the function. This
1817 function returns 1 on success and 0 on failure. */
1820 containing_function_bounds (pc, low, high)
1821 CORE_ADDR pc, *low, *high;
1825 if (!find_pc_partial_function (pc, 0, low))
1831 if (!find_pc_partial_function (scan, 0, high))
1833 } while (*low == *high);
1838 /* Dump a specified section of assembly code. With no command line
1839 arguments, this command will dump the assembly code for the
1840 function surrounding the pc value in the selected frame. With one
1841 argument, it will dump the assembly code surrounding that pc value.
1842 Two arguments are interpeted as bounds within which to dump
1847 disassemble_command (arg, from_tty)
1851 CORE_ADDR low, high;
1857 if (!selected_frame)
1858 error ("No frame selected.\n");
1860 pc = get_frame_pc (selected_frame);
1861 if (!containing_function_bounds (pc, &low, &high))
1862 error ("No function contains pc specified by selected frame.\n");
1864 else if (!(space_index = (char *) strchr (arg, ' ')))
1867 pc = parse_and_eval_address (arg);
1868 if (!containing_function_bounds (pc, &low, &high))
1869 error ("No function contains specified pc.\n");
1873 /* Two arguments. */
1874 *space_index = '\0';
1875 low = parse_and_eval_address (arg);
1876 high = parse_and_eval_address (space_index + 1);
1879 printf_filtered ("Dump of assembler code ");
1883 find_pc_partial_function (pc, &name, 0);
1884 printf_filtered ("for function %s:\n", name);
1887 printf_filtered ("from 0x%x to 0x%x:\n", low, high);
1889 /* Dump the specified range. */
1890 for (pc = low; pc < high; )
1893 print_address (pc, stdout);
1894 printf_filtered (":\t");
1895 pc += print_insn (pc, stdout);
1896 printf_filtered ("\n");
1898 printf_filtered ("End of assembler dump.\n");
1904 _initialize_printcmd ()
1906 current_display_number = -1;
1908 add_info ("address", address_info,
1909 "Describe where variable VAR is stored.");
1911 add_com ("x", class_vars, x_command,
1912 "Examine memory: x/FMT ADDRESS.\n\
1913 ADDRESS is an expression for the memory address to examine.\n\
1914 FMT is a repeat count followed by a format letter and a size letter.\n\
1915 Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),\n\
1916 f(float), a(address), i(instruction), c(char) and s(string).\n\
1917 Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).\n\
1918 g is meaningful only with f, for type double.\n\
1919 The specified number of objects of the specified size are printed\n\
1920 according to the format.\n\n\
1921 Defaults for format and size letters are those previously used.\n\
1922 Default count is 1. Default address is following last thing printed\n\
1923 with this command or \"print\".");
1925 add_com ("disassemble", class_vars, disassemble_command,
1926 "Disassemble a specified section of memory.\n\
1927 Default is the function surrounding the pc of the selected frame.\n\
1928 With a single argument, the function surrounding that address is dumped.\n\
1929 Two arguments are taken as a range of memory to dump.");
1931 add_com ("ptype", class_vars, ptype_command,
1932 "Print definition of type TYPE.\n\
1933 Argument may be a type name defined by typedef, or \"struct STRUCTNAME\"\n\
1934 or \"union UNIONNAME\" or \"enum ENUMNAME\".\n\
1935 The selected stack frame's lexical context is used to look up the name.");
1937 add_com ("whatis", class_vars, whatis_command,
1938 "Print data type of expression EXP.");
1941 add_com ("whereis", class_vars, whereis_command,
1942 "Print line number and file of definition of variable.");
1945 add_info ("display", display_info,
1946 "Expressions to display when program stops, with code numbers.");
1948 add_cmd ("undisplay", class_vars, undisplay_command,
1949 "Cancel some expressions to be displayed when program stops.\n\
1950 Arguments are the code numbers of the expressions to stop displaying.\n\
1951 No argument means cancel all automatic-display expressions.\n\
1952 \"delete display\" has the same effect as this command.\n\
1953 Do \"info display\" to see current list of code numbers.",
1956 add_com ("display", class_vars, display_command,
1957 "Print value of expression EXP each time the program stops.\n\
1958 /FMT may be used before EXP as in the \"print\" command.\n\
1959 /FMT \"i\" or \"s\" or including a size-letter is allowed,\n\
1960 as in the \"x\" command, and then EXP is used to get the address to examine\n\
1961 and examining is done as in the \"x\" command.\n\n\
1962 With no argument, display all currently requested auto-display expressions.\n\
1963 Use \"undisplay\" to cancel display requests previously made.");
1965 add_cmd ("display", class_vars, enable_display,
1966 "Enable some expressions to be displayed when program stops.\n\
1967 Arguments are the code numbers of the expressions to resume displaying.\n\
1968 No argument means enable all automatic-display expressions.\n\
1969 Do \"info display\" to see current list of code numbers.", &enablelist);
1971 add_cmd ("display", class_vars, disable_display_command,
1972 "Disable some expressions to be displayed when program stops.\n\
1973 Arguments are the code numbers of the expressions to stop displaying.\n\
1974 No argument means disable all automatic-display expressions.\n\
1975 Do \"info display\" to see current list of code numbers.", &disablelist);
1977 add_cmd ("display", class_vars, undisplay_command,
1978 "Cancel some expressions to be displayed when program stops.\n\
1979 Arguments are the code numbers of the expressions to stop displaying.\n\
1980 No argument means cancel all automatic-display expressions.\n\
1981 Do \"info display\" to see current list of code numbers.", &deletelist);
1983 add_com ("printf", class_vars, printf_command,
1984 "printf \"printf format string\", arg1, arg2, arg3, ..., argn\n\
1985 This is useful for formatted output in user-defined commands.");
1986 add_com ("output", class_vars, output_command,
1987 "Like \"print\" but don't put in value history and don't print newline.\n\
1988 This is useful in user-defined commands.");
1990 add_prefix_cmd ("set", class_vars, set_command,
1991 "Perform an assignment VAR = EXP.\n\
1992 You must type the \"=\". VAR may be a debugger \"convenience\" variable\n\
1993 (names starting with $), a register (a few standard names starting with $),\n\
1994 or an actual variable in the program being debugged. EXP is any expression.\n\
1995 Use \"set variable\" for variables with names identical to set subcommands.\n\
1996 \nWith a subcommand, this command modifies parts of the gdb environment.\n\
1997 You can see these environment settings with the \"show\" command.",
1998 &setlist, "set ", 1, &cmdlist);
2000 /* "call" is the same as "set", but handy for dbx users to call fns. */
2001 add_com ("call", class_vars, call_command,
2002 "Call a function in the inferior process.\n\
2003 The argument is the function name and arguments, in standard C notation.\n\
2004 The result is printed and saved in the value history, if it is not void.");
2006 add_cmd ("variable", class_vars, set_command,
2007 "Perform an assignment VAR = EXP.\n\
2008 You must type the \"=\". VAR may be a debugger \"convenience\" variable\n\
2009 (names starting with $), a register (a few standard names starting with $),\n\
2010 or an actual variable in the program being debugged. EXP is any expression.\n\
2011 This may usually be abbreviated to simply \"set\".",
2014 add_com ("print", class_vars, print_command,
2015 concat ("Print value of expression EXP.\n\
2016 Variables accessible are those of the lexical environment of the selected\n\
2017 stack frame, plus all those whose scope is global or an entire file.\n\
2019 $NUM gets previous value number NUM. $ and $$ are the last two values.\n\
2020 $$NUM refers to NUM'th value back from the last one.\n\
2021 Names starting with $ refer to registers (with the values they would have\n\
2022 if the program were to return to the stack frame now selected, restoring\n\
2023 all registers saved by frames farther in) or else to debugger\n\
2024 \"convenience\" variables (any such name not a known register).\n\
2025 Use assignment expressions to give values to convenience variables.\n",
2027 {TYPE}ADREXP refers to a datum of data type TYPE, located at address ADREXP.\n\
2028 @ is a binary operator for treating consecutive data objects\n\
2029 anywhere in memory as an array. FOO@NUM gives an array whose first\n\
2030 element is FOO, whose second element is stored in the space following\n\
2031 where FOO is stored, etc. FOO must be an expression whose value\n\
2032 resides in memory.\n",
2034 EXP may be preceded with /FMT, where FMT is a format letter\n\
2035 but no count or size letter (see \"x\" command)."));
2036 add_com_alias ("p", "print", class_vars, 1);
2038 add_com ("inspect", class_vars, inspect_command,
2039 "Same as \"print\" command, except that if you are running in the epoch\n\
2040 environment, the value is printed in its own window.");