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

8229345: Memory leak due to vtable stubs not being shared on SPARC
Reviewed-by: mdoerr, dholmes, kvn

     1 /*

     2  * Copyright (c) 1997, 2012, 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

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    23  */

    25 #include "precompiled.hpp"

    26 #include "asm/macroAssembler.hpp"

    27 #include "asm/macroAssembler.inline.hpp"

    28 #include "code/icBuffer.hpp"

    29 #include "gc_interface/collectedHeap.inline.hpp"

    30 #include "interpreter/bytecodes.hpp"

    31 #include "memory/resourceArea.hpp"

    32 #include "nativeInst_x86.hpp"

    33 #include "oops/oop.inline.hpp"

    34 #include "oops/oop.inline2.hpp"

    36 int InlineCacheBuffer::ic_stub_code_size() {

    37   return NativeMovConstReg::instruction_size +

    38          NativeJump::instruction_size +

    39          1;

    40   // so that code_end can be set in CodeBuffer

    41   // 64bit 16 = 5 + 10 bytes + 1 byte

    42   // 32bit 11 = 10 bytes + 1 byte

    43 }

    47 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {

    48   ResourceMark rm;

    49   CodeBuffer      code(code_begin, ic_stub_code_size());

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

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

    52   // because

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

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

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

    56   masm->lea(rax, AddressLiteral((address) cached_value, relocInfo::metadata_type));

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

    58 }

    61 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {

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

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

    64   return jump->jump_destination();

    65 }

    68 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {

    69   // creation also verifies the object

    70   NativeMovConstReg* move = nativeMovConstReg_at(code_begin);

    71   // Verifies the jump

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

    73   void* o = (void*)move->data();

    74   return o;

    75 }

src/cpu/x86/vm/icBuffer_x86.cpp@bb1da64b0492