| /* |
| * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.hotspot.amd64; |
| |
| import static org.graalvm.compiler.asm.NumUtil.isInt; |
| import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC; |
| import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode; |
| import static jdk.vm.ci.amd64.AMD64.rax; |
| import static jdk.vm.ci.amd64.AMD64.rip; |
| |
| import org.graalvm.compiler.asm.amd64.AMD64Address; |
| import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; |
| import org.graalvm.compiler.core.common.LIRKind; |
| import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; |
| import org.graalvm.compiler.lir.LIRFrameState; |
| import org.graalvm.compiler.lir.LIRInstructionClass; |
| import org.graalvm.compiler.lir.Opcode; |
| import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction; |
| import org.graalvm.compiler.lir.asm.CompilationResultBuilder; |
| import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; |
| |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.code.RegisterValue; |
| import jdk.vm.ci.code.site.InfopointReason; |
| import jdk.vm.ci.meta.AllocatableValue; |
| import jdk.vm.ci.meta.JavaConstant; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.Value; |
| |
| /** |
| * Emits a safepoint poll. |
| */ |
| @Opcode("SAFEPOINT") |
| public final class AMD64HotSpotSafepointOp extends AMD64LIRInstruction { |
| public static final LIRInstructionClass<AMD64HotSpotSafepointOp> TYPE = LIRInstructionClass.create(AMD64HotSpotSafepointOp.class); |
| |
| @State protected LIRFrameState state; |
| @Temp({OperandFlag.REG, OperandFlag.ILLEGAL}) private AllocatableValue temp; |
| |
| private final GraalHotSpotVMConfig config; |
| |
| public AMD64HotSpotSafepointOp(LIRFrameState state, GraalHotSpotVMConfig config, NodeLIRBuilderTool tool) { |
| super(TYPE); |
| this.state = state; |
| this.config = config; |
| if (isPollingPageFar(config) || ImmutableCode.getValue()) { |
| temp = tool.getLIRGeneratorTool().newVariable(LIRKind.value(tool.getLIRGeneratorTool().target().arch.getWordKind())); |
| } else { |
| // Don't waste a register if it's unneeded |
| temp = Value.ILLEGAL; |
| } |
| } |
| |
| @Override |
| public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm) { |
| emitCode(crb, asm, config, false, state, temp instanceof RegisterValue ? ((RegisterValue) temp).getRegister() : null); |
| } |
| |
| /** |
| * Tests if the polling page address can be reached from the code cache with 32-bit |
| * displacements. |
| */ |
| private static boolean isPollingPageFar(GraalHotSpotVMConfig config) { |
| final long pollingPageAddress = config.safepointPollingAddress; |
| return config.forceUnreachable || !isInt(pollingPageAddress - config.codeCacheLowBound) || !isInt(pollingPageAddress - config.codeCacheHighBound); |
| } |
| |
| public static void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler asm, GraalHotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register scratch) { |
| assert !atReturn || state == null : "state is unneeded at return"; |
| if (ImmutableCode.getValue()) { |
| JavaKind hostWordKind = JavaKind.Long; |
| int alignment = hostWordKind.getBitCount() / Byte.SIZE; |
| JavaConstant pollingPageAddress = JavaConstant.forIntegerKind(hostWordKind, config.safepointPollingAddress); |
| // This move will be patched to load the safepoint page from a data segment |
| // co-located with the immutable code. |
| if (GeneratePIC.getValue()) { |
| asm.movq(scratch, asm.getPlaceholder(-1)); |
| } else { |
| asm.movq(scratch, (AMD64Address) crb.recordDataReferenceInCode(pollingPageAddress, alignment)); |
| } |
| final int pos = asm.position(); |
| crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR); |
| if (state != null) { |
| crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT); |
| } |
| asm.testl(rax, new AMD64Address(scratch)); |
| } else if (isPollingPageFar(config)) { |
| asm.movq(scratch, config.safepointPollingAddress); |
| crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR); |
| final int pos = asm.position(); |
| if (state != null) { |
| crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT); |
| } |
| asm.testl(rax, new AMD64Address(scratch)); |
| } else { |
| crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_NEAR : config.MARKID_POLL_NEAR); |
| final int pos = asm.position(); |
| if (state != null) { |
| crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT); |
| } |
| // The C++ code transforms the polling page offset into an RIP displacement |
| // to the real address at that offset in the polling page. |
| asm.testl(rax, new AMD64Address(rip, 0)); |
| } |
| } |
| } |