Mercurial > hg > truffle
annotate src/os/windows/vm/chaitin_windows.cpp @ 3095:d3d00c1ea071
IdealGraphVisualizer: Enhance text view so it can display arbitrary properties from the active graph's group. For diff graphs, it shows the textual difference between the property strings using the NetBeans Diff module.
| author | Peter Hofer <peter.hofer@jku.at> |
|---|---|
| date | Wed, 29 Jun 2011 17:33:35 +0200 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 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 |