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src/os/windows/vm/chaitin_windows.cpp@203f64878aab
src/os/windows/vm/chaitin_windows.cpp
Thu, 17 Jan 2013 10:25:16 -0500
- author
- hseigel
- date
- Thu, 17 Jan 2013 10:25:16 -0500
- changeset 4465
- 203f64878aab
- parent 2314
- f95d63e2154a
- permissions
- -rw-r--r--
7102489: RFE: cleanup jlong typedef on __APPLE__and _LLP64 systems.
Summary: Define jlong as long on all LP64 platforms and add JLONG_FORMAT macro.
Reviewed-by: dholmes, coleenp, mikael, kvn
1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "opto/chaitin.hpp"
27 #include "opto/machnode.hpp"
29 // Disallow the use of the frame pointer (EBP) for implicit null exceptions
30 // on win95/98. If we do not do this, the OS gets confused and gives a stack
31 // error.
32 void PhaseRegAlloc::pd_preallocate_hook() {
33 #ifndef _WIN64
34 if (ImplicitNullChecks && !os::win32::is_nt()) {
35 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
36 Block *block = _cfg._blocks[block_num];
38 Node *block_end = block->end();
39 if (block_end->is_MachNullCheck() &&
40 block_end->as_Mach()->ideal_Opcode() != Op_Con) {
41 // The last instruction in the block is an implicit null check.
42 // Fix its input so that it does not load into the frame pointer.
43 _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(),
44 block_end->as_MachNullCheck()->_vidx);
45 }
46 }
47 }
48 #else
49 // WIN64==itanium on XP
50 #endif
51 }
53 #ifdef ASSERT
54 // Verify that no implicit null check uses the frame pointer (EBP) as
55 // its register on win95/98. Use of the frame pointer in an implicit
56 // null check confuses the OS, yielding a stack error.
57 void PhaseRegAlloc::pd_postallocate_verify_hook() {
58 #ifndef _WIN64
59 if (ImplicitNullChecks && !os::win32::is_nt()) {
60 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
61 Block *block = _cfg._blocks[block_num];
63 Node *block_end = block->_nodes[block->_nodes.size()-1];
64 if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {
65 // The last instruction in the block is an implicit
66 // null check. Verify that this instruction does not
67 // use the frame pointer.
68 int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));
69 assert(reg != EBP_num,
70 "implicit null check using frame pointer on win95/98");
71 }
72 }
73 }
74 #else
75 // WIN64==itanium on XP
76 #endif
77 }
78 #endif
