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annotate graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotSafepointOp.java @ 12559:ae412befde21

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read HotSpotVMConfig fields from HotSpot's vmStructs via annotations
author twisti
date Wed, 23 Oct 2013 19:50:14 -0700
parents ce0b00597980
children 1a66453f73db
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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.hotspot.bridge.Marks.*;
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27
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28 import com.oracle.graal.api.code.*;
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29 import com.oracle.graal.api.meta.*;
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30 import com.oracle.graal.asm.*;
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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.lir.*;
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34 import com.oracle.graal.lir.amd64.*;
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35 import com.oracle.graal.lir.asm.*;
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36 import com.oracle.graal.nodes.spi.*;
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37
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38 /**
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39 * Emits a safepoint poll.
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40 */
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41 @Opcode("SAFEPOINT")
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42 public class AMD64HotSpotSafepointOp extends AMD64LIRInstruction {
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43
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44 @State protected LIRFrameState state;
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45 @Temp({OperandFlag.REG}) private AllocatableValue temp;
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46
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47 private final HotSpotVMConfig config;
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48
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49 public AMD64HotSpotSafepointOp(LIRFrameState state, HotSpotVMConfig config, LIRGeneratorTool tool) {
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50 this.state = state;
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51 this.config = config;
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52 temp = tool.newVariable(tool.target().wordKind);
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53 }
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54
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55 @Override
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56 public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler asm) {
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57 RegisterValue scratch = (RegisterValue) temp;
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58 emitCode(tasm, asm, config, false, state, scratch.getRegister());
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59 }
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60
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61 /**
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62 * Tests if the polling page address can be reached from the code cache with 32-bit
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63 * displacements.
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64 */
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65 private static boolean isPollingPageFar(HotSpotVMConfig config) {
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66 final long pollingPageAddress = config.safepointPollingAddress;
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67 // TODO return ForceUnreachable ||
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68 return !NumUtil.isInt(pollingPageAddress - config.codeCacheLowBoundary()) || !NumUtil.isInt(pollingPageAddress - config.codeCacheHighBoundary());
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69 }
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70
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71 public static void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler asm, HotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register scratch) {
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72 final int pos = asm.codeBuffer.position();
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73 if (isPollingPageFar(config)) {
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74 asm.movq(scratch, config.safepointPollingAddress);
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75 tasm.recordMark(atReturn ? MARK_POLL_RETURN_FAR : MARK_POLL_FAR);
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76 if (state != null) {
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77 tasm.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
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78 }
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79 asm.movq(scratch, new AMD64Address(scratch));
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80 } else {
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81 tasm.recordMark(atReturn ? MARK_POLL_RETURN_NEAR : MARK_POLL_NEAR);
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82 if (state != null) {
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83 tasm.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
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84 }
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85 // The C++ code transforms the polling page offset into an RIP displacement
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86 // to the real address at that offset in the polling page.
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87 asm.movq(scratch, new AMD64Address(rip, 0));
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88 }
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89 }
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90 }