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annotate graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotSafepointOp.java @ 21673:5024c80224c7

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moved com.oracle.graal.[amd64|sparc] to com.oracle.jvmci.[amd64|sparc] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 02 Jun 2015 22:11:52 +0200
parents 48c1ebd24120
children 6df25b1418be
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2011, 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
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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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48c1ebd24120 renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
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25 import com.oracle.jvmci.code.RegisterValue;
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26 import com.oracle.jvmci.code.Register;
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27 import com.oracle.jvmci.code.InfopointReason;
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28 import com.oracle.jvmci.meta.Value;
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29 import com.oracle.jvmci.meta.LIRKind;
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30 import com.oracle.jvmci.meta.JavaConstant;
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31 import com.oracle.jvmci.meta.AllocatableValue;
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32 import com.oracle.jvmci.meta.Kind;
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33
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34 import static com.oracle.graal.asm.NumUtil.*;
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35 import static com.oracle.graal.compiler.common.GraalOptions.*;
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36 import static com.oracle.jvmci.amd64.AMD64.*;
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37
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38 import com.oracle.graal.asm.amd64.*;
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39 import com.oracle.graal.lir.*;
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40 import com.oracle.graal.lir.amd64.*;
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41 import com.oracle.graal.lir.asm.*;
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42 import com.oracle.graal.nodes.spi.*;
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43 import com.oracle.jvmci.hotspot.*;
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44
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45 /**
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46 * Emits a safepoint poll.
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47 */
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48 @Opcode("SAFEPOINT")
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49 public final class AMD64HotSpotSafepointOp extends AMD64LIRInstruction {
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50 public static final LIRInstructionClass<AMD64HotSpotSafepointOp> TYPE = LIRInstructionClass.create(AMD64HotSpotSafepointOp.class);
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51
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52 @State protected LIRFrameState state;
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53 @Temp({OperandFlag.REG, OperandFlag.ILLEGAL}) private AllocatableValue temp;
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54
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55 private final HotSpotVMConfig config;
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56
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57 public AMD64HotSpotSafepointOp(LIRFrameState state, HotSpotVMConfig config, NodeLIRBuilderTool tool) {
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58 super(TYPE);
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59 this.state = state;
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60 this.config = config;
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61 if (isPollingPageFar(config) || ImmutableCode.getValue()) {
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62 temp = tool.getLIRGeneratorTool().newVariable(LIRKind.value(tool.getLIRGeneratorTool().target().wordKind));
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63 } else {
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64 // Don't waste a register if it's unneeded
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65 temp = Value.ILLEGAL;
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66 }
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67 }
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68
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69 @Override
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70 public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm) {
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71 emitCode(crb, asm, config, false, state, temp instanceof RegisterValue ? ((RegisterValue) temp).getRegister() : null);
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72 }
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73
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74 /**
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75 * Tests if the polling page address can be reached from the code cache with 32-bit
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76 * displacements.
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77 */
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78 private static boolean isPollingPageFar(HotSpotVMConfig config) {
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79 final long pollingPageAddress = config.safepointPollingAddress;
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80 return config.forceUnreachable || !isInt(pollingPageAddress - config.codeCacheLowBoundary()) || !isInt(pollingPageAddress - config.codeCacheHighBoundary());
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81 }
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82
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83 public static void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm, HotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register scratch) {
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84 assert !atReturn || state == null : "state is unneeded at return";
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85 if (ImmutableCode.getValue()) {
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86 Kind hostWordKind = Kind.Long;
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87 int alignment = hostWordKind.getBitCount() / Byte.SIZE;
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88 JavaConstant pollingPageAddress = JavaConstant.forIntegerKind(hostWordKind, config.safepointPollingAddress);
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89 // This move will be patched to load the safepoint page from a data segment
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90 // co-located with the immutable code.
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91 asm.movq(scratch, (AMD64Address) crb.recordDataReferenceInCode(pollingPageAddress, alignment));
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92 final int pos = asm.position();
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93 crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR);
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94 if (state != null) {
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95 crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
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96 }
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97 asm.testl(rax, new AMD64Address(scratch));
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98 } else if (isPollingPageFar(config)) {
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99 asm.movq(scratch, config.safepointPollingAddress);
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100 crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR);
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101 final int pos = asm.position();
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102 if (state != null) {
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103 crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
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104 }
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105 asm.testl(rax, new AMD64Address(scratch));
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106 } else {
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107 crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_NEAR : config.MARKID_POLL_NEAR);
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108 final int pos = asm.position();
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109 if (state != null) {
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110 crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
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111 }
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112 // The C++ code transforms the polling page offset into an RIP displacement
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113 // to the real address at that offset in the polling page.
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114 asm.testl(rax, new AMD64Address(rip, 0));
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115 }
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116 }
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117 }