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annotate src/cpu/x86/vm/registerMap_x86.cpp @ 20970:a560c9b81f0f

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Add suport for oops in vector registers at safepoints
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 14 Apr 2015 22:20:07 -0700
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children 658db9861109
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20970
a560c9b81f0f Add suport for oops in vector registers at safepoints
Tom Rodriguez <tom.rodriguez@oracle.com>
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1 /*
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
a560c9b81f0f Add suport for oops in vector registers at safepoints
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
a560c9b81f0f Add suport for oops in vector registers at safepoints
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a560c9b81f0f Add suport for oops in vector registers at safepoints
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a560c9b81f0f Add suport for oops in vector registers at safepoints
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
a560c9b81f0f Add suport for oops in vector registers at safepoints
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include <runtime/registerMap.hpp>
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26 #include "vmreg_x86.inline.hpp"
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27
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28 address RegisterMap::pd_location(VMReg reg) const {
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29 if (reg->is_XMMRegister()) {
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30 int regBase = reg->value() - ConcreteRegisterImpl::max_fpr;
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31 if (regBase % 4 == 0) {
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32 // Reads of the low and high 16 byte parts should be handled by location itself
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33 return NULL;
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34 }
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35 VMReg baseReg = as_XMMRegister(regBase >> 3)->as_VMReg();
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36 intptr_t offset = (reg->value() - baseReg->value()) * 4;
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37 if (offset >= 16) {
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38 // The high part of YMM registers are saved in a their own area in the frame
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39 baseReg = baseReg->next()->next()->next()->next();
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40 offset -= 16;
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41 }
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42 address baseLocation = location(baseReg);
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43 if (baseLocation != NULL) {
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44 return baseLocation + offset;
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45 }
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46 }
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47 return NULL;
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48 }