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- /* Obstack wrapper for GDB.
- Copyright (C) 2002-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #if !defined (GDB_OBSTACK_H)
- #define GDB_OBSTACK_H 1
- #include "obstack.h"
- /* Utility macros - wrap obstack alloc into something more robust. */
- template <typename T>
- static inline T*
- obstack_zalloc (struct obstack *ob)
- {
- static_assert (IsMallocable<T>::value, "Trying to use OBSTACK_ZALLOC with a \
- non-POD data type. Use obstack_new instead.");
- return ((T *) memset (obstack_alloc (ob, sizeof (T)), 0, sizeof (T)));
- }
- #define OBSTACK_ZALLOC(OBSTACK,TYPE) obstack_zalloc<TYPE> ((OBSTACK))
- template <typename T>
- static inline T *
- obstack_calloc (struct obstack *ob, size_t number)
- {
- static_assert (IsMallocable<T>::value, "Trying to use OBSTACK_CALLOC with a \
- non-POD data type. Use obstack_new instead.");
- return ((T *) memset (obstack_alloc (ob, number * sizeof (T)), 0,
- number * sizeof (T)));
- }
- #define OBSTACK_CALLOC(OBSTACK,NUMBER,TYPE) \
- obstack_calloc<TYPE> ((OBSTACK), (NUMBER))
- /* Allocate an object on OB and call its constructor. */
- template <typename T, typename... Args>
- static inline T*
- obstack_new (struct obstack *ob, Args&&... args)
- {
- T* object = (T *) obstack_alloc (ob, sizeof (T));
- object = new (object) T (std::forward<Args> (args)...);
- return object;
- }
- /* Unless explicitly specified, GDB obstacks always use xmalloc() and
- xfree(). */
- /* Note: ezannoni 2004-02-09: One could also specify the allocation
- functions using a special init function for each obstack,
- obstack_specify_allocation. However we just use obstack_init and
- let these defines here do the job. While one could argue the
- superiority of one approach over the other, we just chose one
- throughout. */
- #define obstack_chunk_alloc xmalloc
- #define obstack_chunk_free xfree
- #define obstack_grow_str(OBSTACK,STRING) \
- obstack_grow (OBSTACK, STRING, strlen (STRING))
- #define obstack_grow_str0(OBSTACK,STRING) \
- obstack_grow0 (OBSTACK, STRING, strlen (STRING))
- #define obstack_grow_wstr(OBSTACK, WSTRING) \
- obstack_grow (OBSTACK, WSTRING, sizeof (gdb_wchar_t) * gdb_wcslen (WSTRING))
- /* Concatenate NULL terminated variable argument list of `const char
- *' strings; return the new string. Space is found in the OBSTACKP.
- Argument list must be terminated by a sentinel expression `(char *)
- NULL'. */
- extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
- /* Duplicate STRING, returning an equivalent string that's allocated on the
- obstack OBSTACKP. */
- static inline char *
- obstack_strdup (struct obstack *obstackp, const char *string)
- {
- return (char *) obstack_copy0 (obstackp, string, strlen (string));
- }
- /* Duplicate STRING, returning an equivalent string that's allocated on the
- obstack OBSTACKP. */
- static inline char *
- obstack_strdup (struct obstack *obstackp, const std::string &string)
- {
- return (char *) obstack_copy0 (obstackp, string.c_str (),
- string.size ());
- }
- /* Duplicate the first N characters of STRING, returning a
- \0-terminated string that's allocated on the obstack OBSTACKP.
- Note that exactly N characters are copied, even if STRING is
- shorter. */
- static inline char *
- obstack_strndup (struct obstack *obstackp, const char *string, size_t n)
- {
- return (char *) obstack_copy0 (obstackp, string, n);
- }
- /* An obstack that frees itself on scope exit. */
- struct auto_obstack : obstack
- {
- auto_obstack ()
- { obstack_init (this); }
- ~auto_obstack ()
- { obstack_free (this, NULL); }
- DISABLE_COPY_AND_ASSIGN (auto_obstack);
- /* Free all memory in the obstack but leave it valid for further
- allocation. */
- void clear ()
- { obstack_free (this, obstack_base (this)); }
- };
- /* Objects are allocated on obstack instead of heap. */
- struct allocate_on_obstack
- {
- allocate_on_obstack () = default;
- void* operator new (size_t size, struct obstack *obstack)
- {
- return obstack_alloc (obstack, size);
- }
- void* operator new[] (size_t size, struct obstack *obstack)
- {
- return obstack_alloc (obstack, size);
- }
- void operator delete (void *memory) {}
- void operator delete[] (void *memory) {}
- };
- #endif
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