Mercurial > hg > truffle
view src/os/windows/vm/chaitin_windows.cpp @ 5118:e5427faad192
Merge
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Mon, 19 Mar 2012 15:51:49 -0700 |
parents | f95d63e2154a |
children |
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/* * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "opto/chaitin.hpp" #include "opto/machnode.hpp" // Disallow the use of the frame pointer (EBP) for implicit null exceptions // on win95/98. If we do not do this, the OS gets confused and gives a stack // error. void PhaseRegAlloc::pd_preallocate_hook() { #ifndef _WIN64 if (ImplicitNullChecks && !os::win32::is_nt()) { for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { Block *block = _cfg._blocks[block_num]; Node *block_end = block->end(); if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) { // The last instruction in the block is an implicit null check. // Fix its input so that it does not load into the frame pointer. _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(), block_end->as_MachNullCheck()->_vidx); } } } #else // WIN64==itanium on XP #endif } #ifdef ASSERT // Verify that no implicit null check uses the frame pointer (EBP) as // its register on win95/98. Use of the frame pointer in an implicit // null check confuses the OS, yielding a stack error. void PhaseRegAlloc::pd_postallocate_verify_hook() { #ifndef _WIN64 if (ImplicitNullChecks && !os::win32::is_nt()) { for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { Block *block = _cfg._blocks[block_num]; Node *block_end = block->_nodes[block->_nodes.size()-1]; if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) { // The last instruction in the block is an implicit // null check. Verify that this instruction does not // use the frame pointer. int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx)); assert(reg != EBP_num, "implicit null check using frame pointer on win95/98"); } } } #else // WIN64==itanium on XP #endif } #endif