67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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#include "incls/_precompiled.incl"
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#include "incls/_icBuffer_x86.cpp.incl"
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int InlineCacheBuffer::ic_stub_code_size() {
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return NativeMovConstReg::instruction_size +
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NativeJump::instruction_size +
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1;
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// so that code_end can be set in CodeBuffer
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// 64bit 16 = 5 + 10 bytes + 1 byte
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// 32bit 11 = 10 bytes + 1 byte
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}
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void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) {
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ResourceMark rm;
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CodeBuffer code(code_begin, ic_stub_code_size());
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MacroAssembler* masm = new MacroAssembler(&code);
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// note: even though the code contains an embedded oop, we do not need reloc info
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// because
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// (1) the oop is old (i.e., doesn't matter for scavenges)
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// (2) these ICStubs are removed *before* a GC happens, so the roots disappear
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assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop");
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masm->lea(rax, OopAddress((address) cached_oop));
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masm->jump(ExternalAddress(entry_point));
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}
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address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
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NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
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NativeJump* jump = nativeJump_at(move->next_instruction_address());
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return jump->jump_destination();
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}
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oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {
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// creation also verifies the object
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NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
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// Verifies the jump
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NativeJump* jump = nativeJump_at(move->next_instruction_address());
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return (oop)move->data();
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}
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