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comparison 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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20969:534f0dde2810 20970:a560c9b81f0f
1 /*
2 * Copyright (c) 2015, 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
21 * questions.
22 *
23 */
24
25 #include <runtime/registerMap.hpp>
26 #include "vmreg_x86.inline.hpp"
27
28 address RegisterMap::pd_location(VMReg reg) const {
29 if (reg->is_XMMRegister()) {
30 int regBase = reg->value() - ConcreteRegisterImpl::max_fpr;
31 if (regBase % 4 == 0) {
32 // Reads of the low and high 16 byte parts should be handled by location itself
33 return NULL;
34 }
35 VMReg baseReg = as_XMMRegister(regBase >> 3)->as_VMReg();
36 intptr_t offset = (reg->value() - baseReg->value()) * 4;
37 if (offset >= 16) {
38 // The high part of YMM registers are saved in a their own area in the frame
39 baseReg = baseReg->next()->next()->next()->next();
40 offset -= 16;
41 }
42 address baseLocation = location(baseReg);
43 if (baseLocation != NULL) {
44 return baseLocation + offset;
45 }
46 }
47 return NULL;
48 }