Mercurial > hg > graal-compiler

comparison src/os/windows/vm/chaitin_windows.cpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_chaitin_windows.cpp.incl"
27
28 // Disallow the use of the frame pointer (EBP) for implicit null exceptions
29 // on win95/98. If we do not do this, the OS gets confused and gives a stack
30 // error.
31 void PhaseRegAlloc::pd_preallocate_hook() {
32 #ifndef _WIN64
33 if (ImplicitNullChecks && !os::win32::is_nt()) {
34 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
35 Block *block = _cfg._blocks[block_num];
36
37 Node *block_end = block->end();
38 if (block_end->is_MachNullCheck() &&
39 block_end->as_Mach()->ideal_Opcode() != Op_Con) {
40 // The last instruction in the block is an implicit null check.
41 // Fix its input so that it does not load into the frame pointer.
42 _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(),
43 block_end->as_MachNullCheck()->_vidx);
44 }
45 }
46 }
47 #else
48 // WIN64==itanium on XP
49 #endif
50 }
51
52 #ifdef ASSERT
53 // Verify that no implicit null check uses the frame pointer (EBP) as
54 // its register on win95/98. Use of the frame pointer in an implicit
55 // null check confuses the OS, yielding a stack error.
56 void PhaseRegAlloc::pd_postallocate_verify_hook() {
57 #ifndef _WIN64
58 if (ImplicitNullChecks && !os::win32::is_nt()) {
59 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
60 Block *block = _cfg._blocks[block_num];
61
62 Node *block_end = block->_nodes[block->_nodes.size()-1];
63 if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {
64 // The last instruction in the block is an implicit
65 // null check. Verify that this instruction does not
66 // use the frame pointer.
67 int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));
68 assert(reg != EBP_num,
69 "implicit null check using frame pointer on win95/98");
70 }
71 }
72 }
73 #else
74 // WIN64==itanium on XP
75 #endif
76 }
77 #endif