1.1 --- a/src/os/windows/vm/chaitin_windows.cpp Wed Apr 24 20:55:28 2013 -0400
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,78 +0,0 @@
1.4 -/*
1.5 - * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation.
1.11 - *
1.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 - * version 2 for more details (a copy is included in the LICENSE file that
1.16 - * accompanied this code).
1.17 - *
1.18 - * You should have received a copy of the GNU General Public License version
1.19 - * 2 along with this work; if not, write to the Free Software Foundation,
1.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 - *
1.22 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 - * or visit www.oracle.com if you need additional information or have any
1.24 - * questions.
1.25 - *
1.26 - */
1.27 -
1.28 -#include "precompiled.hpp"
1.29 -#include "opto/chaitin.hpp"
1.30 -#include "opto/machnode.hpp"
1.31 -
1.32 -// Disallow the use of the frame pointer (EBP) for implicit null exceptions
1.33 -// on win95/98. If we do not do this, the OS gets confused and gives a stack
1.34 -// error.
1.35 -void PhaseRegAlloc::pd_preallocate_hook() {
1.36 -#ifndef _WIN64
1.37 - if (ImplicitNullChecks && !os::win32::is_nt()) {
1.38 - for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
1.39 - Block *block = _cfg._blocks[block_num];
1.40 -
1.41 - Node *block_end = block->end();
1.42 - if (block_end->is_MachNullCheck() &&
1.43 - block_end->as_Mach()->ideal_Opcode() != Op_Con) {
1.44 - // The last instruction in the block is an implicit null check.
1.45 - // Fix its input so that it does not load into the frame pointer.
1.46 - _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(),
1.47 - block_end->as_MachNullCheck()->_vidx);
1.48 - }
1.49 - }
1.50 - }
1.51 -#else
1.52 - // WIN64==itanium on XP
1.53 -#endif
1.54 -}
1.55 -
1.56 -#ifdef ASSERT
1.57 -// Verify that no implicit null check uses the frame pointer (EBP) as
1.58 -// its register on win95/98. Use of the frame pointer in an implicit
1.59 -// null check confuses the OS, yielding a stack error.
1.60 -void PhaseRegAlloc::pd_postallocate_verify_hook() {
1.61 -#ifndef _WIN64
1.62 - if (ImplicitNullChecks && !os::win32::is_nt()) {
1.63 - for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
1.64 - Block *block = _cfg._blocks[block_num];
1.65 -
1.66 - Node *block_end = block->_nodes[block->_nodes.size()-1];
1.67 - if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {
1.68 - // The last instruction in the block is an implicit
1.69 - // null check. Verify that this instruction does not
1.70 - // use the frame pointer.
1.71 - int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));
1.72 - assert(reg != EBP_num,
1.73 - "implicit null check using frame pointer on win95/98");
1.74 - }
1.75 - }
1.76 - }
1.77 -#else
1.78 - // WIN64==itanium on XP
1.79 -#endif
1.80 -}
1.81 -#endif
