OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [include/] [objalloc.h] - Blame information for rev 826

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 24 jeremybenn
/* objalloc.h -- routines to allocate memory for objects
2
   Copyright 1997, 2001 Free Software Foundation, Inc.
3
   Written by Ian Lance Taylor, Cygnus Solutions.
4
 
5
This program is free software; you can redistribute it and/or modify it
6
under the terms of the GNU General Public License as published by the
7
Free Software Foundation; either version 2, or (at your option) any
8
later version.
9
 
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.
14
 
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, 51 Franklin Street - Fifth Floor,
18
Boston, MA 02110-1301, USA.  */
19
 
20
#ifndef OBJALLOC_H
21
#define OBJALLOC_H
22
 
23
#include "ansidecl.h"
24
 
25
/* These routines allocate space for an object.  The assumption is
26
   that the object will want to allocate space as it goes along, but
27
   will never want to free any particular block.  There is a function
28
   to free a block, which also frees all more recently allocated
29
   blocks.  There is also a function to free all the allocated space.
30
 
31
   This is essentially a specialization of obstacks.  The main
32
   difference is that a block may not be allocated a bit at a time.
33
   Another difference is that these routines are always built on top
34
   of malloc, and always pass an malloc failure back to the caller,
35
   unlike more recent versions of obstacks.  */
36
 
37
/* This is what an objalloc structure looks like.  Callers should not
38
   refer to these fields, nor should they allocate these structure
39
   themselves.  Instead, they should only create them via
40
   objalloc_init, and only access them via the functions and macros
41
   listed below.  The structure is only defined here so that we can
42
   access it via macros.  */
43
 
44
struct objalloc
45
{
46
  char *current_ptr;
47
  unsigned int current_space;
48
  void *chunks;
49
};
50
 
51
/* Work out the required alignment.  */
52
 
53
struct objalloc_align { char x; double d; };
54
 
55
#if defined (__STDC__) && __STDC__
56
#ifndef offsetof
57
#include <stddef.h>
58
#endif
59
#endif
60
#ifndef offsetof
61
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
62
#endif
63
#define OBJALLOC_ALIGN offsetof (struct objalloc_align, d)
64
 
65
/* Create an objalloc structure.  Returns NULL if malloc fails.  */
66
 
67
extern struct objalloc *objalloc_create (void);
68
 
69
/* Allocate space from an objalloc structure.  Returns NULL if malloc
70
   fails.  */
71
 
72
extern void *_objalloc_alloc (struct objalloc *, unsigned long);
73
 
74
/* The macro version of objalloc_alloc.  We only define this if using
75
   gcc, because otherwise we would have to evaluate the arguments
76
   multiple times, or use a temporary field as obstack.h does.  */
77
 
78
#if defined (__GNUC__) && defined (__STDC__) && __STDC__
79
 
80
/* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
81
   does not implement __extension__.  But that compiler doesn't define
82
   __GNUC_MINOR__.  */
83
#if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
84
#define __extension__
85
#endif
86
 
87
#define objalloc_alloc(o, l)                                            \
88
  __extension__                                                         \
89
  ({ struct objalloc *__o = (o);                                        \
90
     unsigned long __len = (l);                                         \
91
     if (__len == 0)                                                     \
92
       __len = 1;                                                       \
93
     __len = (__len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1);      \
94
     (__len <= __o->current_space                                       \
95
      ? (__o->current_ptr += __len,                                     \
96
         __o->current_space -= __len,                                   \
97
         (void *) (__o->current_ptr - __len))                           \
98
      : _objalloc_alloc (__o, __len)); })
99
 
100
#else /* ! __GNUC__ */
101
 
102
#define objalloc_alloc(o, l) _objalloc_alloc ((o), (l))
103
 
104
#endif /* ! __GNUC__ */
105
 
106
/* Free an entire objalloc structure.  */
107
 
108
extern void objalloc_free (struct objalloc *);
109
 
110
/* Free a block allocated by objalloc_alloc.  This also frees all more
111
   recently allocated blocks.  */
112
 
113
extern void objalloc_free_block (struct objalloc *, void *);
114
 
115
#endif /* OBJALLOC_H */

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.