92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/*
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* Copyright (c) 2016, 2017, 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 "runtime/sharedRuntime.hpp"
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#include "vmreg_x86.inline.hpp"
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#ifdef COMPILER1
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#include "c1/c1_Runtime1.hpp"
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#endif //COMPILER1
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#define __ masm->
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#ifdef COMPILER1
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// ---------------------------------------------------------------------------
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// Object.hashCode, System.identityHashCode can pull the hashCode from the
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// header word instead of doing a full VM transition once it's been computed.
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// Since hashCode is usually polymorphic at call sites we can't do this
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// optimization at the call site without a lot of work.
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void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm,
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const methodHandle& method,
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Register obj_reg,
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Register result) {
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Label slowCase;
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// Unlike for Object.hashCode, System.identityHashCode is static method and
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// gets object as argument instead of the receiver.
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if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) {
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Label Continue;
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// return 0 for null reference input
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__ cmpptr(obj_reg, (int32_t)NULL_WORD);
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__ jcc(Assembler::notEqual, Continue);
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__ xorptr(result, result);
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__ ret(0);
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__ bind(Continue);
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}
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__ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
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// check if locked
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__ testptr(result, markOopDesc::unlocked_value);
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__ jcc(Assembler::zero, slowCase);
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if (UseBiasedLocking) {
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// Check if biased and fall through to runtime if so
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__ testptr(result, markOopDesc::biased_lock_bit_in_place);
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__ jcc(Assembler::notZero, slowCase);
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}
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// get hash
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#ifdef _LP64
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// Read the header and build a mask to get its hash field.
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// Depend on hash_mask being at most 32 bits and avoid the use of hash_mask_in_place
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// because it could be larger than 32 bits in a 64-bit vm. See markOop.hpp.
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__ shrptr(result, markOopDesc::hash_shift);
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__ andptr(result, markOopDesc::hash_mask);
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#else
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__ andptr(result, markOopDesc::hash_mask_in_place);
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#endif //_LP64
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// test if hashCode exists
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__ jcc(Assembler::zero, slowCase);
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#ifndef _LP64
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__ shrptr(result, markOopDesc::hash_shift);
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#endif
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__ ret(0);
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__ bind(slowCase);
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}
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#endif //COMPILER1
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