Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/os/windows/vm/chaitin_windows.cpp
src/os/windows/vm/chaitin_windows.cpp
- changeset 5001
- e10e43e58e92
- parent 2314
- f95d63e2154a
equal
deleted
inserted
replaced
| 5000:a6e09d6dd8e5 | 5001:e10e43e58e92 |
|---|---|
| 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 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "opto/chaitin.hpp" | |
| 27 #include "opto/machnode.hpp" | |
| 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 |
