76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
/*
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "code/icBuffer.hpp"
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#include "gc_interface/collectedHeap.inline.hpp"
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#include "interpreter/bytecodes.hpp"
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#include "memory/resourceArea.hpp"
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#include "nativeInst_x86.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/oop.inline2.hpp"
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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, void* cached_value, 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 value, we do not need reloc info
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// because
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// (1) the value 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_value == NULL || cached_oop->is_perm(), "must be perm oop");
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masm->lea(rax, AddressLiteral((address) cached_value, relocInfo::metadata_type));
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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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void* InlineCacheBuffer::ic_buffer_cached_value(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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void* o = (void*)move->data();
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return o;
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}
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