Mercurial > hg > graal-jvmci-8
comparison src/os/windows/vm/chaitin_windows.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 |