1 /* 2 * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_chaitin_windows.cpp.incl" 27 28 // Disallow the use of the frame pointer (EBP) for implicit null exceptions 29 // on win95/98. If we do not do this, the OS gets confused and gives a stack 30 // error. 31 void PhaseRegAlloc::pd_preallocate_hook() { 32 #ifndef _WIN64 33 if (ImplicitNullChecks && !os::win32::is_nt()) { 34 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { 35 Block *block = _cfg._blocks[block_num]; 36 37 Node *block_end = block->end(); 38 if (block_end->is_MachNullCheck() && 39 block_end->as_Mach()->ideal_Opcode() != Op_Con) { 40 // The last instruction in the block is an implicit null check. 41 // Fix its input so that it does not load into the frame pointer. 42 _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(), 43 block_end->as_MachNullCheck()->_vidx); 44 } 45 } 46 } | 1 /* 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "opto/chaitin.hpp" 27 #include "opto/machnode.hpp" 28 29 // Disallow the use of the frame pointer (EBP) for implicit null exceptions 30 // on win95/98. If we do not do this, the OS gets confused and gives a stack 31 // error. 32 void PhaseRegAlloc::pd_preallocate_hook() { 33 #ifndef _WIN64 34 if (ImplicitNullChecks && !os::win32::is_nt()) { 35 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { 36 Block *block = _cfg._blocks[block_num]; 37 38 Node *block_end = block->end(); 39 if (block_end->is_MachNullCheck() && 40 block_end->as_Mach()->ideal_Opcode() != Op_Con) { 41 // The last instruction in the block is an implicit null check. 42 // Fix its input so that it does not load into the frame pointer. 43 _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(), 44 block_end->as_MachNullCheck()->_vidx); 45 } 46 } 47 } |