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comparison src/vdb-win32.c @ 3092:141c2920ea48

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[xemacs-hg @ 2005-11-25 01:41:31 by crestani] Incremental Garbage Collector
author crestani
date Fri, 25 Nov 2005 01:42:08 +0000
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children 11daf37dae4d
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3091:c22d8984148c 3092:141c2920ea48
1 /* Virtual diry bit implementation for XEmacs.
2 Copyright (C) 2005 Marcus Crestani.
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
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* Synched up with: Not in FSF. */
22
23 #include <config.h>
24 #include "lisp.h"
25 #include "gc.h"
26 #include "mc-alloc.h"
27 #include "vdb.h"
28
29 #include "syswindows.h"
30
31
32 DWORD WINAPI
33 win32_fault_handler (LPEXCEPTION_POINTERS e)
34 {
35 #define GET_FAULT_ADDRESS (void *) e->ExceptionRecord->ExceptionInformation[1]
36 if ((e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
37 && (e->ExceptionRecord->ExceptionInformation[0] == 1)
38 && write_barrier_enabled
39 && (fault_on_protected_page (GET_FAULT_ADDRESS)))
40 {
41 vdb_designate_modified (GET_FAULT_ADDRESS);
42 unprotect_page_and_mark_dirty (GET_FAULT_ADDRESS);
43 return EXCEPTION_CONTINUE_EXECUTION;
44 }
45 else
46 return EXCEPTION_CONTINUE_SEARCH;
47 }
48
49 typedef DWORD (WINAPI *gcPVECTORED_EXCEPTION_HANDLER) (LPEXCEPTION_POINTERS e);
50
51
52 void
53 vdb_install_signal_handler (void)
54 {
55 HMODULE hm;
56 PVOID (WINAPI *aveh) (ULONG, gcPVECTORED_EXCEPTION_HANDLER);
57
58 /* See init_signals_very_early () in signal.c. */
59 if (noninteractive && !initialized)
60 {
61 allow_incremental_gc = 0;
62 return;
63 }
64
65 hm = qxeGetModuleHandle (XETEXT ("kernel32"));
66 if (hm)
67 aveh = (PVOID (WINAPI *) (ULONG, gcPVECTORED_EXCEPTION_HANDLER))
68 GetProcAddress (hm, "AddVectoredExceptionHandler");
69 else
70 {
71 fprintf (stderr, "\nFAILED TO LOAD LIBRARY\n");
72 aveh = NULL;
73 }
74 if (aveh)
75 {
76 allow_incremental_gc = 1;
77 aveh (TRUE, win32_fault_handler);
78 }
79 else
80 {
81 fprintf (stderr, "\nFAILED TO INSTALL SIGNAL HANDLER\n");
82 ABORT ();
83 }
84 }
85
86
87 void
88 vdb_protect (void *ptr, EMACS_INT len)
89 {
90 DWORD old;
91 VirtualProtect (ptr, len, PAGE_READONLY, &old);
92 }
93
94
95 void
96 vdb_unprotect (void *ptr, EMACS_INT len)
97 {
98 DWORD old;
99 VirtualProtect (ptr, len, PAGE_READWRITE, &old);
100 }