Mercurial > hg > truffle
annotate src/os/windows/vm/chaitin_windows.cpp @ 7683:d16336557215
Merge
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 04 Feb 2013 17:04:23 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "opto/chaitin.hpp" | |
27 #include "opto/machnode.hpp" | |
0 | 28 |
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]; | |
37 | |
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 } | |
52 | |
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]; | |
62 | |
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 |