155 lines
4.7 KiB
C++
155 lines
4.7 KiB
C++
/* Obstack wrapper for GDB.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (GDB_OBSTACK_H)
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#define GDB_OBSTACK_H 1
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#include "obstack.h"
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/* Utility macros - wrap obstack alloc into something more robust. */
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template <typename T>
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static inline T*
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obstack_zalloc (struct obstack *ob)
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{
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static_assert (IsMallocable<T>::value, "Trying to use OBSTACK_ZALLOC with a \
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non-POD data type. Use obstack_new instead.");
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return ((T *) memset (obstack_alloc (ob, sizeof (T)), 0, sizeof (T)));
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}
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#define OBSTACK_ZALLOC(OBSTACK,TYPE) obstack_zalloc<TYPE> ((OBSTACK))
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template <typename T>
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static inline T *
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obstack_calloc (struct obstack *ob, size_t number)
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{
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static_assert (IsMallocable<T>::value, "Trying to use OBSTACK_CALLOC with a \
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non-POD data type. Use obstack_new instead.");
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return ((T *) memset (obstack_alloc (ob, number * sizeof (T)), 0,
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number * sizeof (T)));
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}
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#define OBSTACK_CALLOC(OBSTACK,NUMBER,TYPE) \
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obstack_calloc<TYPE> ((OBSTACK), (NUMBER))
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/* Allocate an object on OB and call its constructor. */
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template <typename T, typename... Args>
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static inline T*
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obstack_new (struct obstack *ob, Args&&... args)
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{
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T* object = (T *) obstack_alloc (ob, sizeof (T));
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object = new (object) T (std::forward<Args> (args)...);
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return object;
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}
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/* Unless explicitly specified, GDB obstacks always use xmalloc() and
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xfree(). */
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/* Note: ezannoni 2004-02-09: One could also specify the allocation
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functions using a special init function for each obstack,
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obstack_specify_allocation. However we just use obstack_init and
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let these defines here do the job. While one could argue the
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superiority of one approach over the other, we just chose one
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throughout. */
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free xfree
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#define obstack_grow_str(OBSTACK,STRING) \
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obstack_grow (OBSTACK, STRING, strlen (STRING))
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#define obstack_grow_str0(OBSTACK,STRING) \
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obstack_grow0 (OBSTACK, STRING, strlen (STRING))
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#define obstack_grow_wstr(OBSTACK, WSTRING) \
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obstack_grow (OBSTACK, WSTRING, sizeof (gdb_wchar_t) * gdb_wcslen (WSTRING))
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/* Concatenate NULL terminated variable argument list of `const char
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*' strings; return the new string. Space is found in the OBSTACKP.
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Argument list must be terminated by a sentinel expression `(char *)
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NULL'. */
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extern char *obconcat (struct obstack *obstackp, ...) ATTRIBUTE_SENTINEL;
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/* Duplicate STRING, returning an equivalent string that's allocated on the
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obstack OBSTACKP. */
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static inline char *
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obstack_strdup (struct obstack *obstackp, const char *string)
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{
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return (char *) obstack_copy0 (obstackp, string, strlen (string));
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}
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/* Duplicate STRING, returning an equivalent string that's allocated on the
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obstack OBSTACKP. */
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static inline char *
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obstack_strdup (struct obstack *obstackp, const std::string &string)
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{
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return (char *) obstack_copy0 (obstackp, string.c_str (),
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string.size ());
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}
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/* Duplicate the first N characters of STRING, returning a
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\0-terminated string that's allocated on the obstack OBSTACKP.
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Note that exactly N characters are copied, even if STRING is
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shorter. */
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static inline char *
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obstack_strndup (struct obstack *obstackp, const char *string, size_t n)
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{
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return (char *) obstack_copy0 (obstackp, string, n);
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}
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/* An obstack that frees itself on scope exit. */
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struct auto_obstack : obstack
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{
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auto_obstack ()
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{ obstack_init (this); }
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~auto_obstack ()
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{ obstack_free (this, NULL); }
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/* Free all memory in the obstack but leave it valid for further
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allocation. */
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void clear ()
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{ obstack_free (this, obstack_base (this)); }
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};
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/* Objects are allocated on obstack instead of heap. */
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struct allocate_on_obstack
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{
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allocate_on_obstack () = default;
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void* operator new (size_t size, struct obstack *obstack)
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{
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return obstack_alloc (obstack, size);
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}
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void* operator new[] (size_t size, struct obstack *obstack)
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{
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return obstack_alloc (obstack, size);
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}
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void operator delete (void *memory) {}
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void operator delete[] (void *memory) {}
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};
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#endif
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