1 /* Support for printing C values for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2001, 2003, 2005, 2006, 2007, 2008
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
26 #include "expression.h"
35 /* Print function pointer with inferior address ADDRESS onto stdio
39 print_function_pointer_address (CORE_ADDR address, struct ui_file *stream)
41 CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
45 /* If the function pointer is represented by a description, print the
46 address of the description. */
47 if (addressprint && func_addr != address)
49 fputs_filtered ("@", stream);
50 fputs_filtered (paddress (address), stream);
51 fputs_filtered (": ", stream);
53 print_address_demangle (func_addr, stream, demangle);
57 /* Apply a heuristic to decide whether an array of TYPE or a pointer
58 to TYPE should be printed as a textual string. Return non-zero if
59 it should, or zero if it should be treated as an array of integers
60 or pointer to integers. FORMAT is the current format letter,
63 We guess that "char" is a character. Explicitly signed and
64 unsigned character types are also characters. Integer data from
65 vector types is not. The user can override this by using the /s
69 textual_element_type (struct type *type, char format)
71 struct type *true_type = check_typedef (type);
73 if (format != 0 && format != 's')
76 /* TYPE_CODE_CHAR is always textual. */
77 if (TYPE_CODE (true_type) == TYPE_CODE_CHAR)
82 /* Print this as a string if we can manage it. For now, no
83 wide character support. */
84 if (TYPE_CODE (true_type) == TYPE_CODE_INT
85 && TYPE_LENGTH (true_type) == 1)
90 /* If a one-byte TYPE_CODE_INT is missing the not-a-character
91 flag, then we treat it as text; otherwise, we assume it's
92 being used as data. */
93 if (TYPE_CODE (true_type) == TYPE_CODE_INT
94 && TYPE_LENGTH (true_type) == 1
95 && !TYPE_NOTTEXT (true_type))
103 /* Print data of type TYPE located at VALADDR (within GDB), which came from
104 the inferior at address ADDRESS, onto stdio stream STREAM according to
105 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
108 If the data are a string pointer, returns the number of string characters
111 If DEREF_REF is nonzero, then dereference references, otherwise just print
114 The PRETTY parameter controls prettyprinting. */
117 c_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
118 CORE_ADDR address, struct ui_file *stream, int format,
119 int deref_ref, int recurse, enum val_prettyprint pretty)
121 unsigned int i = 0; /* Number of characters printed */
123 struct type *elttype;
128 CHECK_TYPEDEF (type);
129 switch (TYPE_CODE (type))
131 case TYPE_CODE_ARRAY:
132 elttype = check_typedef (TYPE_TARGET_TYPE (type));
133 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
135 eltlen = TYPE_LENGTH (elttype);
136 len = TYPE_LENGTH (type) / eltlen;
137 if (prettyprint_arrays)
139 print_spaces_filtered (2 + 2 * recurse, stream);
142 /* Print arrays of textual chars with a string syntax. */
143 if (textual_element_type (elttype, format))
145 /* If requested, look for the first null char and only print
146 elements up to it. */
147 if (stop_print_at_null)
149 unsigned int temp_len;
151 /* Look for a NULL char. */
153 (valaddr + embedded_offset)[temp_len]
154 && temp_len < len && temp_len < print_max;
159 LA_PRINT_STRING (stream, valaddr + embedded_offset, len, eltlen, 0);
164 fprintf_filtered (stream, "{");
165 /* If this is a virtual function table, print the 0th
166 entry specially, and the rest of the members normally. */
167 if (cp_is_vtbl_ptr_type (elttype))
170 fprintf_filtered (stream, _("%d vtable entries"), len - 1);
176 val_print_array_elements (type, valaddr + embedded_offset, address, stream,
177 format, deref_ref, recurse, pretty, i);
178 fprintf_filtered (stream, "}");
182 /* Array of unspecified length: treat like pointer to first elt. */
184 goto print_unpacked_pointer;
186 case TYPE_CODE_MEMBERPTR:
189 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
192 cp_print_class_member (valaddr + embedded_offset,
193 TYPE_DOMAIN_TYPE (type),
197 case TYPE_CODE_METHODPTR:
198 cplus_print_method_ptr (valaddr + embedded_offset, type, stream);
202 if (format && format != 's')
204 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
207 if (vtblprint && cp_is_vtbl_ptr_type (type))
209 /* Print the unmangled name if desired. */
210 /* Print vtable entry - we only get here if we ARE using
211 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
213 = extract_typed_address (valaddr + embedded_offset, type);
214 print_function_pointer_address (addr, stream);
217 elttype = check_typedef (TYPE_TARGET_TYPE (type));
219 addr = unpack_pointer (type, valaddr + embedded_offset);
220 print_unpacked_pointer:
222 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
224 /* Try to print what function it points to. */
225 print_function_pointer_address (addr, stream);
226 /* Return value is irrelevant except for string pointers. */
231 fputs_filtered (paddress (addr), stream);
233 /* For a pointer to a textual type, also print the string
234 pointed to, unless pointer is null. */
235 /* FIXME: need to handle wchar_t here... */
237 if (textual_element_type (elttype, format) && addr != 0)
239 i = val_print_string (addr, -1, TYPE_LENGTH (elttype), stream);
241 else if (cp_is_vtbl_member (type))
243 /* print vtbl's nicely */
244 CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
246 struct minimal_symbol *msymbol =
247 lookup_minimal_symbol_by_pc (vt_address);
248 if ((msymbol != NULL) &&
249 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
251 fputs_filtered (" <", stream);
252 fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
253 fputs_filtered (">", stream);
255 if (vt_address && vtblprint)
257 struct value *vt_val;
258 struct symbol *wsym = (struct symbol *) NULL;
260 struct block *block = (struct block *) NULL;
264 wsym = lookup_symbol (DEPRECATED_SYMBOL_NAME (msymbol), block,
265 VAR_DOMAIN, &is_this_fld, NULL);
269 wtype = SYMBOL_TYPE (wsym);
273 wtype = TYPE_TARGET_TYPE (type);
275 vt_val = value_at (wtype, vt_address);
276 common_val_print (vt_val, stream, format,
277 deref_ref, recurse + 1, pretty);
280 fprintf_filtered (stream, "\n");
281 print_spaces_filtered (2 + 2 * recurse, stream);
286 /* Return number of characters printed, including the terminating
287 '\0' if we reached the end. val_print_string takes care including
288 the terminating '\0' if necessary. */
294 elttype = check_typedef (TYPE_TARGET_TYPE (type));
298 = extract_typed_address (valaddr + embedded_offset, type);
299 fprintf_filtered (stream, "@");
300 fputs_filtered (paddress (addr), stream);
302 fputs_filtered (": ", stream);
304 /* De-reference the reference. */
307 if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
309 struct value *deref_val =
311 (TYPE_TARGET_TYPE (type),
312 unpack_pointer (lookup_pointer_type (builtin_type_void),
313 valaddr + embedded_offset));
314 common_val_print (deref_val, stream, format, deref_ref,
318 fputs_filtered ("???", stream);
322 case TYPE_CODE_UNION:
323 if (recurse && !unionprint)
325 fprintf_filtered (stream, "{...}");
329 case TYPE_CODE_STRUCT:
330 /*FIXME: Abstract this away */
331 if (vtblprint && cp_is_vtbl_ptr_type (type))
333 /* Print the unmangled name if desired. */
334 /* Print vtable entry - we only get here if NOT using
335 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
336 int offset = (embedded_offset +
337 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8);
338 struct type *field_type = TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET);
340 = extract_typed_address (valaddr + offset, field_type);
342 print_function_pointer_address (addr, stream);
345 cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream, format,
346 recurse, pretty, NULL, 0);
352 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
355 len = TYPE_NFIELDS (type);
356 val = unpack_long (type, valaddr + embedded_offset);
357 for (i = 0; i < len; i++)
360 if (val == TYPE_FIELD_BITPOS (type, i))
367 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
371 print_longest (stream, 'd', 0, val);
375 case TYPE_CODE_FLAGS:
377 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
379 val_print_type_code_flags (type, valaddr + embedded_offset, stream);
383 case TYPE_CODE_METHOD:
386 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
389 /* FIXME, we should consider, at least for ANSI C language, eliminating
390 the distinction made between FUNCs and POINTERs to FUNCs. */
391 fprintf_filtered (stream, "{");
392 type_print (type, "", stream, -1);
393 fprintf_filtered (stream, "} ");
394 /* Try to print what function it points to, and its address. */
395 print_address_demangle (address, stream, demangle);
399 format = format ? format : output_format;
401 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
404 val = unpack_long (type, valaddr + embedded_offset);
406 fputs_filtered ("false", stream);
408 fputs_filtered ("true", stream);
410 print_longest (stream, 'd', 0, val);
414 case TYPE_CODE_RANGE:
415 /* FIXME: create_range_type does not set the unsigned bit in a
416 range type (I think it probably should copy it from the target
417 type), so we won't print values which are too large to
418 fit in a signed integer correctly. */
419 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
420 print with the target type, though, because the size of our type
421 and the target type might differ). */
425 format = format ? format : output_format;
428 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
432 val_print_type_code_int (type, valaddr + embedded_offset, stream);
433 /* C and C++ has no single byte int type, char is used instead.
434 Since we don't know whether the value is really intended to
435 be used as an integer or a character, print the character
436 equivalent as well. */
437 if (textual_element_type (type, format))
439 fputs_filtered (" ", stream);
440 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset),
447 format = format ? format : output_format;
450 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
454 val = unpack_long (type, valaddr + embedded_offset);
455 if (TYPE_UNSIGNED (type))
456 fprintf_filtered (stream, "%u", (unsigned int) val);
458 fprintf_filtered (stream, "%d", (int) val);
459 fputs_filtered (" ", stream);
460 LA_PRINT_CHAR ((unsigned char) val, stream);
467 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
471 print_floating (valaddr + embedded_offset, type, stream);
475 case TYPE_CODE_DECFLOAT:
477 print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
479 print_decimal_floating (valaddr + embedded_offset, type, stream);
483 fprintf_filtered (stream, "void");
486 case TYPE_CODE_ERROR:
487 fprintf_filtered (stream, _("<error type>"));
490 case TYPE_CODE_UNDEF:
491 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
492 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
493 and no complete type for struct foo in that file. */
494 fprintf_filtered (stream, _("<incomplete type>"));
497 case TYPE_CODE_COMPLEX:
499 print_scalar_formatted (valaddr + embedded_offset,
500 TYPE_TARGET_TYPE (type),
503 print_floating (valaddr + embedded_offset, TYPE_TARGET_TYPE (type),
505 fprintf_filtered (stream, " + ");
507 print_scalar_formatted (valaddr + embedded_offset
508 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
509 TYPE_TARGET_TYPE (type),
512 print_floating (valaddr + embedded_offset
513 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
514 TYPE_TARGET_TYPE (type),
516 fprintf_filtered (stream, " * I");
520 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type));
527 c_value_print (struct value *val, struct ui_file *stream, int format,
528 enum val_prettyprint pretty)
530 struct type *type, *real_type;
531 int full, top, using_enc;
533 /* If it is a pointer, indicate what it points to.
535 Print type also if it is a reference.
537 C++: if it is a member pointer, we will take care
538 of that when we print it. */
540 type = check_typedef (value_type (val));
542 if (TYPE_CODE (type) == TYPE_CODE_PTR
543 || TYPE_CODE (type) == TYPE_CODE_REF)
545 /* Hack: remove (char *) for char strings. Their
546 type is indicated by the quoted string anyway.
547 (Don't use textual_element_type here; quoted strings
548 are always exactly (char *). */
549 if (TYPE_CODE (type) == TYPE_CODE_PTR
550 && TYPE_NAME (type) == NULL
551 && TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL
552 && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char") == 0)
556 else if (objectprint && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
559 if (TYPE_CODE(type) == TYPE_CODE_REF)
561 /* Copy value, change to pointer, so we don't get an
562 * error about a non-pointer type in value_rtti_target_type
564 struct value *temparg;
565 temparg=value_copy(val);
566 deprecated_set_value_type (temparg, lookup_pointer_type (TYPE_TARGET_TYPE(type)));
569 /* Pointer to class, check real type of object */
570 fprintf_filtered (stream, "(");
571 real_type = value_rtti_target_type (val, &full, &top, &using_enc);
574 /* RTTI entry found */
575 if (TYPE_CODE (type) == TYPE_CODE_PTR)
577 /* create a pointer type pointing to the real type */
578 type = lookup_pointer_type (real_type);
582 /* create a reference type referencing the real type */
583 type = lookup_reference_type (real_type);
585 /* JYG: Need to adjust pointer value. */
586 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
587 value_contents_writeable (val)[0] -= top;
589 /* Note: When we look up RTTI entries, we don't get any
590 information on const or volatile attributes */
592 type_print (type, "", stream, -1);
593 fprintf_filtered (stream, ") ");
598 fprintf_filtered (stream, "(");
599 type_print (value_type (val), "", stream, -1);
600 fprintf_filtered (stream, ") ");
604 if (!value_initialized (val))
605 fprintf_filtered (stream, " [uninitialized] ");
607 if (objectprint && (TYPE_CODE (type) == TYPE_CODE_CLASS))
609 /* Attempt to determine real type of object */
610 real_type = value_rtti_type (val, &full, &top, &using_enc);
613 /* We have RTTI information, so use it */
614 val = value_full_object (val, real_type, full, top, using_enc);
615 fprintf_filtered (stream, "(%s%s) ",
616 TYPE_NAME (real_type),
617 full ? "" : _(" [incomplete object]"));
618 /* Print out object: enclosing type is same as real_type if full */
619 return val_print (value_enclosing_type (val),
620 value_contents_all (val), 0,
621 VALUE_ADDRESS (val), stream, format, 1, 0, pretty);
622 /* Note: When we look up RTTI entries, we don't get any information on
623 const or volatile attributes */
625 else if (type != check_typedef (value_enclosing_type (val)))
627 /* No RTTI information, so let's do our best */
628 fprintf_filtered (stream, "(%s ?) ",
629 TYPE_NAME (value_enclosing_type (val)));
630 return val_print (value_enclosing_type (val),
631 value_contents_all (val), 0,
632 VALUE_ADDRESS (val), stream, format, 1, 0, pretty);
634 /* Otherwise, we end up at the return outside this "if" */
637 return val_print (type, value_contents_all (val),
638 value_embedded_offset (val),
639 VALUE_ADDRESS (val) + value_offset (val),
640 stream, format, 1, 0, pretty);