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annotate graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64SafepointOp.java @ 7841:674a8b9e62f8

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Remove unused fields in TargetDescription. Use Unsafe.pageSize().
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 25 Feb 2013 16:15:17 +0100
parents 838293a77af7
children 24e93ac47e95
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1 /*
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2 * Copyright (c) 2011, 2012, 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
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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
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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
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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 package com.oracle.graal.hotspot.amd64;
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24
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25 import static com.oracle.graal.amd64.AMD64.*;
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26 import static com.oracle.graal.phases.GraalOptions.*;
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27 import sun.misc.*;
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28
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29 import com.oracle.graal.amd64.*;
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30 import com.oracle.graal.api.code.*;
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31 import com.oracle.graal.asm.amd64.*;
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32 import com.oracle.graal.hotspot.*;
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33 import com.oracle.graal.hotspot.bridge.*;
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34 import com.oracle.graal.lir.*;
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35 import com.oracle.graal.lir.LIRInstruction.Opcode;
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36 import com.oracle.graal.lir.amd64.*;
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37 import com.oracle.graal.lir.asm.*;
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38
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39 /**
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40 * Emits a safepoint poll.
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41 */
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42 @Opcode("SAFEPOINT")
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43 public class AMD64SafepointOp extends AMD64LIRInstruction {
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44
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45 private static final Unsafe unsafe = Unsafe.getUnsafe();
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46
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47 @State protected LIRFrameState state;
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48
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49 private final HotSpotVMConfig config;
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50
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51 public AMD64SafepointOp(LIRFrameState state, HotSpotVMConfig config) {
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52 this.state = state;
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53 this.config = config;
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54 }
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55
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56 @Override
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57 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler asm) {
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58 Register scratch = tasm.frameMap.registerConfig.getScratchRegister();
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59 int pos = asm.codeBuffer.position();
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60 int offset = SafepointPollOffset % unsafe.pageSize();
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61 if (config.isPollingPageFar) {
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62 asm.movq(scratch, config.safepointPollingAddress + offset);
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63 tasm.recordMark(Marks.MARK_POLL_FAR);
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64 tasm.recordSafepoint(pos, state);
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65 asm.movq(scratch, new AMD64Address(tasm.target.wordKind, scratch.asValue()));
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66 } else {
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67 tasm.recordMark(Marks.MARK_POLL_NEAR);
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68 tasm.recordSafepoint(pos, state);
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69 // The C++ code transforms the polling page offset into an RIP displacement
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70 // to the real address at that offset in the polling page.
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71 asm.movq(scratch, new AMD64Address(tasm.target.wordKind, rip.asValue(), offset));
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72 }
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73 }
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74 }