Mercurial > hg > truffle
view src/os/windows/vm/chaitin_windows.cpp @ 1352:895d9ade6111
Merge
author | asaha |
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date | Tue, 06 Apr 2010 22:06:57 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 1999-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_chaitin_windows.cpp.incl" // 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