1 /* Demangler for GNU C++
2 Copyright (C) 1989 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 /* This is for g++ 1.36.1 (November 6 version). It will probably
20 require changes for any other version.
22 Modified for g++ 1.36.2 (November 18 version).
24 Modified for g++ 1.90.06 (December 31 version). */
26 /* This file exports one function
28 char *cplus_demangle (const char *name, int mode)
30 If NAME is a mangled function name produced by GNU C++, then
31 a pointer to a malloced string giving a C++ representation
32 of the name will be returned; otherwise NULL will be returned.
33 It is the caller's responsibility to free the string which
36 If MODE > 0, then ANSI qualifiers such as `const' and `void' are output.
37 Otherwise they are not.
38 If MODE >= 0, parameters are emitted; otherwise not.
42 cplus_demangle ("foo__1Ai", 0) => "A::foo(int)"
43 cplus_demangle ("foo__1Ai", 1) => "A::foo(int)"
44 cplus_demangle ("foo__1Ai", -1) => "A::foo"
46 cplus_demangle ("foo__1Afe", 0) => "A::foo(float,...)"
47 cplus_demangle ("foo__1Afe", 1) => "A::foo(float,...)"
48 cplus_demangle ("foo__1Afe", -1) => "A::foo"
50 This file imports xmalloc and xrealloc, which are like malloc and
51 realloc except that they generate a fatal error if there is no
54 /* define this if names don't start with _ */
55 /* #define nounderscore 1 */
60 /* GDB-specific, FIXME. */
69 #define memcpy(s1, s2, n) bcopy ((s2), (s1), (n))
70 #define memcmp(s1, s2, n) bcmp ((s2), (s1), (n))
72 #define strrchr rindex
75 /* This is '$' on systems where the assembler can deal with that.
76 Where the assembler can't, it's '.' (but on many systems '.' is
77 used for other things). */
78 #if !defined (CPLUS_MARKER)
79 #define CPLUS_MARKER '$'
87 extern char *cplus_demangle (const char *type, int mode);
89 extern char *cplus_demangle ();
93 /* GDB prototypes these as void* in defs.h, so we better too, at least
94 as long as we're including defs.h. */
95 extern void *xmalloc (int);
96 extern void *xrealloc (char *, int);
97 extern void free (void *);
99 extern char *xmalloc ();
100 extern char *xrealloc ();
104 static char **typevec = 0;
105 static int ntypes = 0;
106 static int typevec_size = 0;
108 const static struct optable {
112 "nw", " new", /* new (1.92) */
113 "dl", " delete", /* new (1.92) */
114 "new", " new", /* old (1.91, and 1.x) */
115 "delete", " delete", /* old (1.91, and 1.x) */
125 "convert", "+", /* unary + */
126 "negate", "-", /* unary - */
132 "postincrement", "++",
133 "postdecrement", "--",
144 "method_call", "->()",
145 "addr", "&", /* unary & */
148 "nop", "", /* for operator= */
151 /* Beware: these aren't '\0' terminated. */
153 typedef struct string {
154 char *b; /* pointer to start of string */
155 char *p; /* pointer after last character */
156 char *e; /* pointer after end of allocated space */
160 static void string_need (string *s, int n);
161 static void string_delete (string *s);
162 static void string_init (string *s);
163 static void string_clear (string *s);
164 static int string_empty (string *s);
165 static void string_append (string *p, const char *s);
166 static void string_appends (string *p, string *s);
167 static void string_appendn (string *p, const char *s, int n);
168 static void string_prepend (string *p, const char *s);
170 static void string_prepends (string *p, string *s);
172 static void string_prependn (string *p, const char *s, int n);
173 static int get_count (const char **type, int *count);
174 static int do_args (const char **type, string *decl, int arg_mode);
175 static int do_type (const char **type, string *result, int arg_mode);
176 static int do_arg (const char **type, string *result, int arg_mode);
177 static void munge_function_name (string *name, int arg_mode);
178 static void remember_type (const char *type, int len);
180 static void string_need ();
181 static void string_delete ();
182 static void string_init ();
183 static void string_clear ();
184 static int string_empty ();
185 static void string_append ();
186 static void string_appends ();
187 static void string_appendn ();
188 static void string_prepend ();
190 static void string_prepends ();
192 static void string_prependn ();
193 static int get_count ();
194 static int do_args ();
195 static int do_type ();
196 static int do_arg ();
197 static int do_args ();
198 static void munge_function_name ();
199 static void remember_type ();
202 /* Takes operator name as e.g. "++" and returns mangled
203 operator name (e.g. "postincrement_expr"), or NULL if not found. */
205 cplus_mangle_opname (opname)
208 int i, len = strlen (opname);
210 for (i = 0; i < sizeof (optable)/sizeof (optable[0]); i++)
212 if (strlen (optable[i].out) == len
213 && memcmp (optable[i].out, opname, len) == 0)
214 return (char *)optable[i].in;
220 cplus_demangle (type, arg_mode)
234 const char *premangle;
237 # define print_ansi_qualifiers (arg_mode > 0)
238 # define print_arg_types (arg_mode >= 0)
240 if (type == NULL || *type == '\0')
247 while (*p != '\0' && !(*p == '_' && p[1] == '_'))
252 if (type[0] == '_' && type[1] == CPLUS_MARKER && type[2] == '_')
257 /* static data member */
258 if (*type != '_' && (strchr (type, CPLUS_MARKER) != NULL))
263 /* virtual table "_vt$" */
264 if (type[0] == '_' && type[1] == 'v' && type[2] == 't' && type[3] == CPLUS_MARKER)
266 char *tem = (char *) xmalloc (strlen (type + 4) + 14 + 1);
267 strcpy (tem, type + 4);
268 strcat (tem, " virtual table");
278 if (!isdigit (p[0]) && ('t' != p[0]))
280 string_delete (&decl);
288 string_delete (&decl);
296 string_appendn (&decl, type, p - type);
297 munge_function_name (&decl, arg_mode);
307 /* a const member function */
310 string_delete (&decl);
333 while (isdigit (*p));
336 string_delete (&decl);
339 if (constructor || destructor)
341 string_appendn (&decl, p, n);
342 string_append (&decl, "::");
344 string_append(&decl, "~");
345 string_appendn (&decl, p, n);
349 string_prepend (&decl, "::");
350 string_prependn (&decl, p, n);
354 remember_type (premangle, p - premangle);
358 string_append(&decl, p+1);
363 success = do_args (&p, &decl, arg_mode);
364 if (const_flag && print_arg_types)
365 string_append (&decl, " const");
369 success = do_args (&p, &decl, arg_mode);
371 /* template additions */
384 string_init(&trawname);
386 /* get template name */
387 if (!get_count (&p, &r))
389 string_appendn (&tname, p, r);
390 string_appendn (&trawname, p, r);
391 string_appendn (&trawname, "", 1);
393 string_append (&tname, "<");
394 /* get size of template parameter list */
395 if (!get_count (&p, &r))
397 for (i = 0; i < r; i++)
400 string_append (&tname, ", ");
401 /* Z for type parameters */
406 success = do_type (&p, &temp, arg_mode);
407 string_appendn (&temp, "", 1);
409 string_append (&tname, temp.b);
410 string_delete(&temp);
414 /* otherwise, value parameter */
417 const char *old_p = p;
423 success = do_type (&p, &temp, arg_mode);
424 string_appendn (&temp, "", 1);
426 string_append (&tname, temp.b);
427 string_delete(&temp);
430 string_append (&tname, "=");
431 while (*old_p && !done)
437 done = is_pointer = 1;
439 case 'C': /* const */
440 case 'U': /* unsigned */
441 case 'V': /* volatile */
442 case 'F': /* function */
443 case 'M': /* member function */
447 case 'Q': /* repetition of following */
448 case 'T': /* remembered type */
454 case 'x': /* long long */
457 case 's': /* short */
459 done = is_integral = 1;
461 case 'r': /* long double */
462 case 'd': /* double */
463 case 'f': /* float */
474 string_appendn (&tname, "-", 1);
479 string_appendn (&tname, p, 1);
487 string_appendn (&tname, "-", 1);
492 string_appendn (&tname, p, 1);
495 if (*p == '.') /* fraction */
497 string_appendn (&tname, ".", 1);
501 string_appendn (&tname, p, 1);
505 if (*p == 'e') /* exponent */
507 string_appendn (&tname, "e", 1);
511 string_appendn (&tname, p, 1);
520 if (!get_count (&p, &symbol_len))
525 string_appendn (&tname, p, symbol_len);
531 string_append (&tname, ">::");
533 string_append(&tname, "~");
534 if (constructor || destructor) {
535 string_append (&tname, trawname.b);
537 string_delete(&trawname);
540 string_delete(&tname);
543 string_prepend (&decl, tname.b);
544 string_delete(&tname);
548 string_append(&decl, p+1);
553 success = do_args (&p, &decl, arg_mode);
558 for (i = 0; i < ntypes; i++)
559 if (typevec[i] != NULL)
564 free ((char *)typevec);
571 string_appendn (&decl, "", 1);
576 string_delete (&decl);
582 get_count (type, count)
586 if (!isdigit (**type))
588 *count = **type - '0';
590 /* see flush_repeats in cplus-method.c */
591 if (isdigit (**type))
593 const char *p = *type;
601 while (isdigit (*p));
611 /* result will be initialised here; it will be freed on failure */
614 do_type (type, result, arg_mode)
624 const char *remembered_type;
627 string_init (result);
631 while (success && !done)
637 n = (*type)[1] - '0';
642 do_type (type, result, arg_mode);
647 string_prepend (&decl, "*");
652 string_prepend (&decl, "&");
657 if (!get_count (type, &n) || n >= ntypes)
661 remembered_type = typevec[n];
662 type = &remembered_type;
668 if (!string_empty (&decl) && decl.b[0] == '*')
670 string_prepend (&decl, "(");
671 string_append (&decl, ")");
673 if (!do_args (type, &decl, arg_mode) || **type != '_')
685 member = **type == 'M';
687 if (!isdigit (**type))
699 while (isdigit (**type));
700 if (strlen (*type) < n)
705 string_append (&decl, ")");
706 string_prepend (&decl, "::");
707 string_prependn (&decl, *type, n);
708 string_prepend (&decl, "(");
722 if (*(*type)++ != 'F')
728 if ((member && !do_args (type, &decl, arg_mode)) || **type != '_')
734 if (! print_ansi_qualifiers)
739 string_append (&decl, " ");
742 string_append (&decl, "const");
747 string_append (&decl, " ");
750 string_append (&decl, "volatile");
756 if ((*type)[1] == 'P')
759 if (print_ansi_qualifiers)
761 if (!string_empty (&decl))
762 string_prepend (&decl, " ");
763 string_prepend (&decl, "const");
777 while (success && !done)
783 if (print_ansi_qualifiers)
786 string_append (result, " ");
789 string_append (result, "const");
795 string_append (result, " ");
798 string_append (result, "unsigned");
802 if (print_ansi_qualifiers)
805 string_append (result, " ");
808 string_append (result, "volatile");
826 string_append (result, " ");
827 string_append (result, "void");
832 string_append (result, " ");
833 string_append (result, "long long");
838 string_append (result, " ");
839 string_append (result, "long");
844 string_append (result, " ");
845 string_append (result, "int");
850 string_append (result, " ");
851 string_append (result, "short");
856 string_append (result, " ");
857 string_append (result, "char");
862 string_append (result, " ");
863 string_append (result, "long double");
868 string_append (result, " ");
869 string_append (result, "double");
874 string_append (result, " ");
875 string_append (result, "float");
879 if (!isdigit (**type))
902 while (isdigit (**type));
903 if (strlen (*type) < n)
909 string_append (result, " ");
910 string_appendn (result, *type, n);
920 if (!string_empty (&decl))
922 string_append (result, " ");
923 string_appends (result, &decl);
925 string_delete (&decl);
930 string_delete (&decl);
931 string_delete (result);
936 /* `result' will be initialised in do_type; it will be freed on failure */
939 do_arg (type, result, arg_mode)
944 const char *start = *type;
946 if (!do_type (type, result, arg_mode))
948 remember_type (start, *type - start);
953 remember_type (start, len)
959 if (ntypes >= typevec_size)
961 if (typevec_size == 0)
964 typevec = (char **) xmalloc (sizeof (char*)*typevec_size);
969 typevec = (char **) xrealloc ((char *)typevec, sizeof (char*)*typevec_size);
972 tem = (char *) xmalloc (len + 1);
973 memcpy (tem, start, len);
975 typevec[ntypes++] = tem;
978 /* `decl' must be already initialised, usually non-empty;
979 it won't be freed on failure */
982 do_args (type, decl, arg_mode)
991 string_append (decl, "(");
993 while (**type != '_' && **type != '\0' && **type != 'e' && **type != 'v')
1000 if (!get_count (type, &r) || !get_count (type, &t) || t >= ntypes)
1004 const char *tem = typevec[t];
1005 if (need_comma && print_arg_types)
1006 string_append (decl, ", ");
1007 if (!do_arg (&tem, &arg, arg_mode))
1009 if (print_arg_types)
1010 string_appends (decl, &arg);
1011 string_delete (&arg);
1017 if (need_comma & print_arg_types)
1018 string_append (decl, ", ");
1019 if (!do_arg (type, &arg, arg_mode))
1021 if (print_arg_types)
1022 string_appends (decl, &arg);
1023 string_delete (&arg);
1030 else if (**type == 'e')
1033 if (print_arg_types)
1036 string_append (decl, ",");
1037 string_append (decl, "...");
1041 if (print_arg_types)
1042 string_append (decl, ")");
1047 munge_function_name (name, arg_mode)
1051 if (!string_empty (name) && name->p - name->b >= 3
1052 && name->b[0] == 'o' && name->b[1] == 'p' && name->b[2] == CPLUS_MARKER)
1055 /* see if it's an assignment expression */
1056 if (name->p - name->b >= 10 /* op$assign_ */
1057 && memcmp (name->b + 3, "assign_", 7) == 0)
1059 for (i = 0; i < sizeof (optable)/sizeof (optable[0]); i++)
1061 int len = name->p - name->b - 10;
1062 if (strlen (optable[i].in) == len
1063 && memcmp (optable[i].in, name->b + 10, len) == 0)
1065 string_clear (name);
1066 string_append (name, "operator");
1067 string_append (name, optable[i].out);
1068 string_append (name, "=");
1075 for (i = 0; i < sizeof (optable)/sizeof (optable[0]); i++)
1077 int len = name->p - name->b - 3;
1078 if (strlen (optable[i].in) == len
1079 && memcmp (optable[i].in, name->b + 3, len) == 0)
1081 string_clear (name);
1082 string_append (name, "operator");
1083 string_append (name, optable[i].out);
1090 else if (!string_empty (name) && name->p - name->b >= 5
1091 && memcmp (name->b, "type$", 5) == 0)
1093 /* type conversion operator */
1095 const char *tem = name->b + 5;
1096 if (do_type (&tem, &type, arg_mode))
1098 string_clear (name);
1099 string_append (name, "operator ");
1100 string_appends (name, &type);
1101 string_delete (&type);
1107 /* a mini string-handling package */
1118 s->p = s->b = (char *) xmalloc (n);
1121 else if (s->e - s->p < n)
1123 int tem = s->p - s->b;
1126 s->b = (char *) xrealloc (s->b, n);
1139 s->b = s->e = s->p = NULL;
1147 s->b = s->p = s->e = NULL;
1161 return s->b == s->p;
1165 string_append (p, s)
1170 if (s == NULL || *s == '\0')
1174 memcpy (p->p, s, n);
1179 string_appends (p, s)
1187 memcpy (p->p, s->b, n);
1192 string_appendn (p, s, n)
1200 memcpy (p->p, s, n);
1205 string_prepend (p, s)
1209 if (s == NULL || *s == '\0')
1211 string_prependn (p, s, strlen (s));
1216 string_prepends (p, s)
1221 string_prependn (p, s->b, s->p - s->b);
1226 string_prependn (p, s, n)
1236 for (q = p->p - 1; q >= p->b; q--)
1238 memcpy (p->b, s, n);