Mercurial > hg > graal-jvmci-8
diff src/os/windows/vm/chaitin_windows.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/windows/vm/chaitin_windows.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,77 @@ +/* + * 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