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src/os/windows/vm/chaitin_windows.cpp@cd3d6a6b95d9 (annotated)
src/os/windows/vm/chaitin_windows.cpp
Fri, 30 Nov 2012 15:23:16 -0800
- author
- twisti
- date
- Fri, 30 Nov 2012 15:23:16 -0800
- changeset 4318
- cd3d6a6b95d9
- parent 2314
- f95d63e2154a
- permissions
- -rw-r--r--
8003240: x86: move MacroAssembler into separate file
Reviewed-by: kvn
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #include "precompiled.hpp" |
| stefank@2314 | 26 | #include "opto/chaitin.hpp" |
| stefank@2314 | 27 | #include "opto/machnode.hpp" |
| duke@435 | 28 | |
| duke@435 | 29 | // Disallow the use of the frame pointer (EBP) for implicit null exceptions |
| duke@435 | 30 | // on win95/98. If we do not do this, the OS gets confused and gives a stack |
| duke@435 | 31 | // error. |
| duke@435 | 32 | void PhaseRegAlloc::pd_preallocate_hook() { |
| duke@435 | 33 | #ifndef _WIN64 |
| duke@435 | 34 | if (ImplicitNullChecks && !os::win32::is_nt()) { |
| duke@435 | 35 | for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { |
| duke@435 | 36 | Block *block = _cfg._blocks[block_num]; |
| duke@435 | 37 | |
| duke@435 | 38 | Node *block_end = block->end(); |
| duke@435 | 39 | if (block_end->is_MachNullCheck() && |
| duke@435 | 40 | block_end->as_Mach()->ideal_Opcode() != Op_Con) { |
| duke@435 | 41 | // The last instruction in the block is an implicit null check. |
| duke@435 | 42 | // Fix its input so that it does not load into the frame pointer. |
| duke@435 | 43 | _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(), |
| duke@435 | 44 | block_end->as_MachNullCheck()->_vidx); |
| duke@435 | 45 | } |
| duke@435 | 46 | } |
| duke@435 | 47 | } |
| duke@435 | 48 | #else |
| duke@435 | 49 | // WIN64==itanium on XP |
| duke@435 | 50 | #endif |
| duke@435 | 51 | } |
| duke@435 | 52 | |
| duke@435 | 53 | #ifdef ASSERT |
| duke@435 | 54 | // Verify that no implicit null check uses the frame pointer (EBP) as |
| duke@435 | 55 | // its register on win95/98. Use of the frame pointer in an implicit |
| duke@435 | 56 | // null check confuses the OS, yielding a stack error. |
| duke@435 | 57 | void PhaseRegAlloc::pd_postallocate_verify_hook() { |
| duke@435 | 58 | #ifndef _WIN64 |
| duke@435 | 59 | if (ImplicitNullChecks && !os::win32::is_nt()) { |
| duke@435 | 60 | for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) { |
| duke@435 | 61 | Block *block = _cfg._blocks[block_num]; |
| duke@435 | 62 | |
| duke@435 | 63 | Node *block_end = block->_nodes[block->_nodes.size()-1]; |
| duke@435 | 64 | if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) { |
| duke@435 | 65 | // The last instruction in the block is an implicit |
| duke@435 | 66 | // null check. Verify that this instruction does not |
| duke@435 | 67 | // use the frame pointer. |
| duke@435 | 68 | int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx)); |
| duke@435 | 69 | assert(reg != EBP_num, |
| duke@435 | 70 | "implicit null check using frame pointer on win95/98"); |
| duke@435 | 71 | } |
| duke@435 | 72 | } |
| duke@435 | 73 | } |
| duke@435 | 74 | #else |
| duke@435 | 75 | // WIN64==itanium on XP |
| duke@435 | 76 | #endif |
| duke@435 | 77 | } |
| duke@435 | 78 | #endif |
