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src/os/windows/vm/chaitin_windows.cpp@a61af66fc99e (annotated)

src/os/windows/vm/chaitin_windows.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Initial load

duke@435	1	/*
duke@435	2	* Copyright 1999-2006 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_chaitin_windows.cpp.incl"
duke@435	27
duke@435	28	// Disallow the use of the frame pointer (EBP) for implicit null exceptions
duke@435	29	// on win95/98. If we do not do this, the OS gets confused and gives a stack
duke@435	30	// error.
duke@435	31	void PhaseRegAlloc::pd_preallocate_hook() {
duke@435	32	#ifndef _WIN64
duke@435	33	if (ImplicitNullChecks && !os::win32::is_nt()) {
duke@435	34	for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
duke@435	35	Block *block = _cfg._blocks[block_num];
duke@435	36
duke@435	37	Node *block_end = block->end();
duke@435	38	if (block_end->is_MachNullCheck() &&
duke@435	39	block_end->as_Mach()->ideal_Opcode() != Op_Con) {
duke@435	40	// The last instruction in the block is an implicit null check.
duke@435	41	// Fix its input so that it does not load into the frame pointer.
duke@435	42	_matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(),
duke@435	43	block_end->as_MachNullCheck()->_vidx);
duke@435	44	}
duke@435	45	}
duke@435	46	}
duke@435	47	#else
duke@435	48	// WIN64==itanium on XP
duke@435	49	#endif
duke@435	50	}
duke@435	51
duke@435	52	#ifdef ASSERT
duke@435	53	// Verify that no implicit null check uses the frame pointer (EBP) as
duke@435	54	// its register on win95/98. Use of the frame pointer in an implicit
duke@435	55	// null check confuses the OS, yielding a stack error.
duke@435	56	void PhaseRegAlloc::pd_postallocate_verify_hook() {
duke@435	57	#ifndef _WIN64
duke@435	58	if (ImplicitNullChecks && !os::win32::is_nt()) {
duke@435	59	for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
duke@435	60	Block *block = _cfg._blocks[block_num];
duke@435	61
duke@435	62	Node *block_end = block->_nodes[block->_nodes.size()-1];
duke@435	63	if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {
duke@435	64	// The last instruction in the block is an implicit
duke@435	65	// null check. Verify that this instruction does not
duke@435	66	// use the frame pointer.
duke@435	67	int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));
duke@435	68	assert(reg != EBP_num,
duke@435	69	"implicit null check using frame pointer on win95/98");
duke@435	70	}
duke@435	71	}
duke@435	72	}
duke@435	73	#else
duke@435	74	// WIN64==itanium on XP
duke@435	75	#endif
duke@435	76	}
duke@435	77	#endif