1 /* Obstack wrapper for GDB.
3 Copyright (C) 2002-2018 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #if !defined (GDB_OBSTACK_H)
21 #define GDB_OBSTACK_H 1
25 /* Utility macros - wrap obstack alloc into something more robust. */
29 obstack_zalloc (struct obstack
*ob
)
31 static_assert (IsMallocable
<T
>::value
, "Trying to use OBSTACK_ZALLOC with a \
32 non-POD data type. Use obstack_new instead.");
33 return ((T
*) memset (obstack_alloc (ob
, sizeof (T
)), 0, sizeof (T
)));
36 #define OBSTACK_ZALLOC(OBSTACK,TYPE) obstack_zalloc<TYPE> ((OBSTACK))
40 obstack_calloc (struct obstack
*ob
, size_t number
)
42 static_assert (IsMallocable
<T
>::value
, "Trying to use OBSTACK_CALLOC with a \
43 non-POD data type. Use obstack_new instead.");
44 return ((T
*) memset (obstack_alloc (ob
, number
* sizeof (T
)), 0,
45 number
* sizeof (T
)));
48 #define OBSTACK_CALLOC(OBSTACK,NUMBER,TYPE) \
49 obstack_calloc<TYPE> ((OBSTACK), (NUMBER))
51 /* Allocate an object on OB and call its constructor. */
53 template <typename T
, typename
... Args
>
55 obstack_new (struct obstack
*ob
, Args
&&... args
)
57 T
* object
= (T
*) obstack_alloc (ob
, sizeof (T
));
58 object
= new (object
) T (std::forward
<Args
> (args
)...);
62 /* Unless explicitly specified, GDB obstacks always use xmalloc() and
64 /* Note: ezannoni 2004-02-09: One could also specify the allocation
65 functions using a special init function for each obstack,
66 obstack_specify_allocation. However we just use obstack_init and
67 let these defines here do the job. While one could argue the
68 superiority of one approach over the other, we just chose one
71 #define obstack_chunk_alloc xmalloc
72 #define obstack_chunk_free xfree
74 #define obstack_grow_str(OBSTACK,STRING) \
75 obstack_grow (OBSTACK, STRING, strlen (STRING))
76 #define obstack_grow_str0(OBSTACK,STRING) \
77 obstack_grow0 (OBSTACK, STRING, strlen (STRING))
79 #define obstack_grow_wstr(OBSTACK, WSTRING) \
80 obstack_grow (OBSTACK, WSTRING, sizeof (gdb_wchar_t) * gdb_wcslen (WSTRING))
82 /* Concatenate NULL terminated variable argument list of `const char
83 *' strings; return the new string. Space is found in the OBSTACKP.
84 Argument list must be terminated by a sentinel expression `(char *)
87 extern char *obconcat (struct obstack
*obstackp
, ...) ATTRIBUTE_SENTINEL
;
89 /* Duplicate STRING, returning an equivalent string that's allocated on the
92 extern char *obstack_strdup (struct obstack
*obstackp
, const char *string
);
94 /* An obstack that frees itself on scope exit. */
95 struct auto_obstack
: obstack
98 { obstack_init (this); }
101 { obstack_free (this, NULL
); }
103 /* Free all memory in the obstack but leave it valid for further
106 { obstack_free (this, obstack_base (this)); }
109 /* Objects are allocated on obstack instead of heap. */
111 struct allocate_on_obstack
113 allocate_on_obstack () = default;
115 void* operator new (size_t size
, struct obstack
*obstack
)
117 return obstack_alloc (obstack
, size
);
120 void* operator new[] (size_t size
, struct obstack
*obstack
)
122 return obstack_alloc (obstack
, size
);
125 void operator delete (void *memory
) {}
126 void operator delete[] (void *memory
) {}
This page took 0.031592 seconds and 4 git commands to generate.