jdk8-mips64-public/hotspot: src/os/windows/vm/chaitin

6819213: revive sun.boot.library.path
Summary: Support multiplex and mutable sun.boot.library.path
Reviewed-by: acorn, dcubed, xlu

     1 /*

     2  * Copyright 1999-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_chaitin_windows.cpp.incl"

    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];

    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   }

    47 #else

    48   // WIN64==itanium on XP

    49 #endif

    50 }

    52 #ifdef ASSERT

    53 // Verify that no implicit null check uses the frame pointer (EBP) as

    54 // its register on win95/98.  Use of the frame pointer in an implicit

    55 // null check confuses the OS, yielding a stack error.

    56 void PhaseRegAlloc::pd_postallocate_verify_hook() {

    57 #ifndef _WIN64

    58   if (ImplicitNullChecks && !os::win32::is_nt()) {

    59     for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {

    60       Block *block = _cfg._blocks[block_num];

    62       Node *block_end = block->_nodes[block->_nodes.size()-1];

    63       if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {

    64         // The last instruction in the block is an implicit

    65         // null check.  Verify that this instruction does not

    66         // use the frame pointer.

    67         int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));

    68         assert(reg != EBP_num,

    69                "implicit null check using frame pointer on win95/98");

    70       }

    71     }

    72   }

    73 #else

    74   // WIN64==itanium on XP

    75 #endif

    76 }

    77 #endif

src/os/windows/vm/chaitin_windows.cpp@956304450e80