jdk8-mips64-public/hotspot: src/cpu/x86/vm/icBuffer

6703888: Compressed Oops: use the 32-bits gap after klass in a object
Summary: Use the gap also for a narrow oop field and a boxing object value.
Reviewed-by: coleenp, never

     1 /*

     2  * Copyright 1997-2006 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/_icBuffer_x86.cpp.incl"

    28 int InlineCacheBuffer::ic_stub_code_size() {

    29   return NativeMovConstReg::instruction_size +

    30          NativeJump::instruction_size +

    31          1;

    32   // so that code_end can be set in CodeBuffer

    33   // 64bit 16 = 5 + 10 bytes + 1 byte

    34   // 32bit 11 = 10 bytes + 1 byte

    35 }

    39 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) {

    40   ResourceMark rm;

    41   CodeBuffer      code(code_begin, ic_stub_code_size());

    42   MacroAssembler* masm            = new MacroAssembler(&code);

    43   // note: even though the code contains an embedded oop, we do not need reloc info

    44   // because

    45   // (1) the oop is old (i.e., doesn't matter for scavenges)

    46   // (2) these ICStubs are removed *before* a GC happens, so the roots disappear

    47   assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop");

    48   masm->lea(rax, OopAddress((address) cached_oop));

    49   masm->jump(ExternalAddress(entry_point));

    50 }

    53 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {

    54   NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object

    55   NativeJump*        jump = nativeJump_at(move->next_instruction_address());

    56   return jump->jump_destination();

    57 }

    60 oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {

    61   // creation also verifies the object

    62   NativeMovConstReg* move = nativeMovConstReg_at(code_begin);

    63   // Verifies the jump

    64   NativeJump*        jump = nativeJump_at(move->next_instruction_address());

    65   return (oop)move->data();

    66 }

src/cpu/x86/vm/icBuffer_x86.cpp@437d03ea40b1

src/cpu/x86/vm/icBuffer_x86.cpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/cpu/x86/vm/icBuffer_x86.cpp@437d03ea40b1

src/cpu/x86/vm/icBuffer_x86.cpp