1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #include "expression.h"
31 extern int vtblprint; /* Controls printing of vtbl's */
32 extern int demangle; /* whether to print C++ syms raw or src-form */
35 cp_print_class_member PARAMS ((char *, struct type *, FILE *, char *));
38 cp_print_class_method PARAMS ((char *, struct type *, FILE *));
41 cp_print_value_fields PARAMS ((struct type *, char *, FILE *, int, int,
42 enum val_prettyprint, struct type **));
45 cp_is_vtbl_ptr_type PARAMS ((struct type *));
48 cp_is_vtbl_member PARAMS ((struct type *));
53 /* BEGIN-FIXME: Hooks into c-typeprint.c */
56 c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int));
59 cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
64 extern struct obstack dont_print_obstack;
67 /* Print data of type TYPE located at VALADDR (within GDB), which came from
68 the inferior at address ADDRESS, onto stdio stream STREAM according to
69 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
72 If the data are a string pointer, returns the number of string characters
75 If DEREF_REF is nonzero, then dereference references, otherwise just print
78 The PRETTY parameter controls prettyprinting. */
81 c_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
90 enum val_prettyprint pretty;
92 register unsigned int i = 0; /* Number of characters printed */
100 switch (TYPE_CODE (type))
102 case TYPE_CODE_ARRAY:
103 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
105 elttype = TYPE_TARGET_TYPE (type);
106 eltlen = TYPE_LENGTH (elttype);
107 len = TYPE_LENGTH (type) / eltlen;
108 if (prettyprint_arrays)
110 print_spaces_filtered (2 + 2 * recurse, stream);
112 /* For an array of chars, print with string syntax. */
113 if (eltlen == 1 && TYPE_CODE (elttype) == TYPE_CODE_INT
114 && (format == 0 || format == 's'))
116 if (addressprint && format != 's')
118 fprintf_filtered (stream, "0x%x ", address);
120 LA_PRINT_STRING (stream, valaddr, len, 0);
124 fprintf_filtered (stream, "{");
125 /* If this is a virtual function table, print the 0th
126 entry specially, and the rest of the members normally. */
127 if (cp_is_vtbl_ptr_type (elttype))
130 fprintf_filtered (stream, "%d vtable entries", len - 1);
136 val_print_array_elements (type, valaddr, address, stream,
137 format, deref_ref, recurse, pretty, i);
138 fprintf_filtered (stream, "}");
142 /* Array of unspecified length: treat like pointer to first elt. */
143 valaddr = (char *) &address;
147 if (format && format != 's')
149 print_scalar_formatted (valaddr, type, format, 0, stream);
152 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
154 cp_print_class_method (valaddr, type, stream);
156 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
158 cp_print_class_member (valaddr,
159 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
164 addr = unpack_pointer (type, valaddr);
165 elttype = TYPE_TARGET_TYPE (type);
167 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
169 /* Try to print what function it points to. */
170 print_address_demangle (addr, stream, demangle);
171 /* Return value is irrelevant except for string pointers. */
175 if (addressprint && format != 's')
177 fprintf_filtered (stream, "0x%x", addr);
180 /* For a pointer to char or unsigned char, also print the string
181 pointed to, unless pointer is null. */
182 if (TYPE_LENGTH (elttype) == 1
183 && TYPE_CODE (elttype) == TYPE_CODE_INT
184 && (format == 0 || format == 's')
187 i = val_print_string (addr, 0, stream);
189 else if (cp_is_vtbl_member(type))
191 /* print vtbl's nicely */
192 CORE_ADDR vt_address = unpack_pointer (type, valaddr);
194 struct minimal_symbol *msymbol =
195 lookup_minimal_symbol_by_pc (vt_address);
196 if ((msymbol != NULL) &&
197 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
199 fputs_filtered (" <", stream);
200 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
201 fputs_filtered (">", stream);
207 vt_val = value_at (TYPE_TARGET_TYPE (type), vt_address);
208 val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
209 VALUE_ADDRESS (vt_val), stream, format,
210 deref_ref, recurse + 1, pretty);
213 fprintf_filtered (stream, "\n");
214 print_spaces_filtered (2 + 2 * recurse, stream);
219 /* Return number of characters printed, plus one for the
220 terminating null if we have "reached the end". */
221 return (i + (print_max && i != print_max));
225 case TYPE_CODE_MEMBER:
226 error ("not implemented: member type in c_val_print");
230 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
232 cp_print_class_member (valaddr,
233 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
239 fprintf_filtered (stream, "@0x%lx",
240 unpack_long (builtin_type_int, valaddr));
242 fputs_filtered (": ", stream);
244 /* De-reference the reference. */
247 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
251 (TYPE_TARGET_TYPE (type),
252 unpack_pointer (lookup_pointer_type (builtin_type_void),
254 val_print (VALUE_TYPE (deref_val),
255 VALUE_CONTENTS (deref_val),
256 VALUE_ADDRESS (deref_val), stream, format,
257 deref_ref, recurse + 1, pretty);
260 fputs_filtered ("???", stream);
264 case TYPE_CODE_UNION:
265 if (recurse && !unionprint)
267 fprintf_filtered (stream, "{...}");
271 case TYPE_CODE_STRUCT:
272 if (vtblprint && cp_is_vtbl_ptr_type(type))
274 /* Print the unmangled name if desired. */
275 print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
276 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
280 cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
287 print_scalar_formatted (valaddr, type, format, 0, stream);
290 len = TYPE_NFIELDS (type);
291 val = unpack_long (builtin_type_int, valaddr);
292 for (i = 0; i < len; i++)
295 if (val == TYPE_FIELD_BITPOS (type, i))
302 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
307 fprintf_filtered (stream, "%lld", val);
309 fprintf_filtered (stream, "%ld", val);
317 print_scalar_formatted (valaddr, type, format, 0, stream);
320 /* FIXME, we should consider, at least for ANSI C language, eliminating
321 the distinction made between FUNCs and POINTERs to FUNCs. */
322 fprintf_filtered (stream, "{");
323 type_print (type, "", stream, -1);
324 fprintf_filtered (stream, "} ");
325 /* Try to print what function it points to, and its address. */
326 print_address_demangle (address, stream, demangle);
330 format = format ? format : output_format;
333 print_scalar_formatted (valaddr, type, format, 0, stream);
337 val_print_type_code_int (type, valaddr, stream);
338 /* C and C++ has no single byte int type, char is used instead.
339 Since we don't know whether the value is really intended to
340 be used as an integer or a character, print the character
341 equivalent as well. */
342 if (TYPE_LENGTH (type) == 1)
344 fputs_filtered (" ", stream);
345 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
352 format = format ? format : output_format;
355 print_scalar_formatted (valaddr, type, format, 0, stream);
359 fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
360 unpack_long (type, valaddr));
361 fputs_filtered (" ", stream);
362 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
369 print_scalar_formatted (valaddr, type, format, 0, stream);
373 print_floating (valaddr, type, stream);
378 fprintf_filtered (stream, "void");
381 case TYPE_CODE_ERROR:
382 fprintf_filtered (stream, "<error type>");
385 case TYPE_CODE_RANGE:
386 /* FIXME, we should not ever have to print one of these yet. */
387 fprintf_filtered (stream, "<range type>");
390 case TYPE_CODE_UNDEF:
391 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
392 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
393 and no complete type for struct foo in that file. */
394 fprintf_filtered (stream, "<incomplete type>");
398 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));