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comparison src/sheap.c @ 428:3ecd8885ac67 r21-2-22

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Import from CVS: tag r21-2-22
author cvs
date Mon, 13 Aug 2007 11:28:15 +0200
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children abe6d1db359e
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427:0a0253eac470 428:3ecd8885ac67
1 /* Static Heap management routines for XEmacs.
2 Copyright (C) 1994, 1998 Free Software Foundation, Inc.
3
4 This file is part of XEmacs.
5
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
9 later version.
10
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to the Free
18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19 02111-1307, USA.*/
20
21 #include <config.h>
22 #include <stdio.h>
23 #include "lisp.h"
24 #include <unistd.h>
25 #include <sheap-adjust.h>
26
27 #define STATIC_HEAP_BASE 0x800000
28 #define STATIC_HEAP_SLOP 0x40000
29 #define STATIC_HEAP_SIZE \
30 (STATIC_HEAP_BASE + SHEAP_ADJUSTMENT + STATIC_HEAP_SLOP)
31 #define BLOCKSIZE (1<<12)
32 #define ALLOC_UNIT (BLOCKSIZE-1)
33 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
34 #define ALIGN_ALLOC(addr) ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
35
36 char static_heap_buffer[STATIC_HEAP_SIZE]={0};
37 char* static_heap_base=static_heap_buffer;
38 char* static_heap_ptr=static_heap_buffer;
39 unsigned long static_heap_size=STATIC_HEAP_SIZE;
40 int static_heap_initialized=0;
41 int static_heap_dumped=0;
42
43 void* more_static_core ( ptrdiff_t increment )
44 {
45 int size = (int) increment;
46 void *result;
47
48 if (!static_heap_initialized)
49 {
50 #ifdef VALMASK
51 if (((unsigned long) static_heap_base & ~VALMASK) != 0)
52 {
53 printf ("error: The heap was allocated in upper memory.\n");
54 exit (-1);
55 }
56 #endif
57 static_heap_base=(char*)ALIGN_ALLOC(static_heap_buffer);
58 static_heap_ptr=static_heap_base;
59 static_heap_size=STATIC_HEAP_SIZE -
60 (static_heap_base-static_heap_buffer);
61 #ifdef __CYGWIN32__
62 sbrk(BLOCKSIZE); /* force space for fork to work */
63 #endif
64 static_heap_initialized=1;
65 }
66
67 result = static_heap_ptr;
68
69 /* we don't need to align - handled by gmalloc. */
70
71 if (size < 0)
72 {
73 if (static_heap_ptr + size < static_heap_base)
74 {
75 return 0;
76 }
77 }
78 else
79 {
80 if (static_heap_ptr + size >= static_heap_base + static_heap_size)
81 {
82 printf(
83
84 "\nRequested %d bytes, static heap exhausted! base is %p, current ptr
85 is %p. You have exhausted the static heap.
86
87 If you are simply trying to compile, remove sheap-adjust.h
88 and recompile from the top level. If this doesn't
89 work then STATIC_HEAP_SLOP (defined in this file) is too small.
90
91 If you want to run temacs, change SHEAP_ADJUSTMENT in sheap-adjust.h
92 to 0 or a +ve number. Generally you should *not* try to run temacs
93 with a static heap, you should dump first.\n", size,
94 static_heap_base, static_heap_ptr);
95
96 exit(-1);
97 return 0;
98 }
99 }
100 static_heap_ptr += size;
101
102 return result;
103 }
104
105 static void
106 sheap_adjust_h ()
107 {
108 FILE *stream = fopen ("sheap-adjust.h", "w");
109
110 if (stream == NULL)
111 report_file_error ("Opening sheap adjustment file",
112 Fcons (build_string ("sheap-adjust.h"), Qnil));
113
114 fprintf (stream,
115 "/*\tDo not edit this file!\n"
116 "\tAutomatically generated by XEmacs */\n"
117 "# define SHEAP_ADJUSTMENT (%d)\n",
118 ((static_heap_ptr - static_heap_buffer) - STATIC_HEAP_BASE));
119 fclose (stream);
120 }
121
122 void
123 report_sheap_usage (int die_if_pure_storage_exceeded)
124 {
125 int rc = 0;
126
127 size_t lost = (STATIC_HEAP_BASE + STATIC_HEAP_SLOP + SHEAP_ADJUSTMENT)
128 - (static_heap_ptr - static_heap_buffer);
129 char buf[200];
130 sprintf (buf, "Static heap usage: %ld of %ld",
131 (long) (static_heap_ptr - static_heap_buffer),
132 (long) (STATIC_HEAP_BASE + STATIC_HEAP_SLOP + SHEAP_ADJUSTMENT));
133
134 if (lost > STATIC_HEAP_SLOP) {
135 sprintf (buf + strlen (buf), " -- %ldk wasted", (long)(lost/1024));
136 if (die_if_pure_storage_exceeded) {
137 sheap_adjust_h();
138 rc = -1;
139 }
140 message ("%s", buf);
141 }
142
143 if (rc < 0) {
144 unlink("SATISFIED");
145 fatal ("Static heap size adjusted, Don't Panic! I will restart the `make'");
146 }
147 }
148
149