| /* |
| * 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 |