src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.sparc/src/org/graalvm/compiler/hotspot/sparc/SPARCHotSpotSafepointOp.java

rev 47958 : [GR-7049] Support Thread-Local Handshake in jdk10.

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2017, 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.

@@ -25,11 +25,14 @@
 import static jdk.vm.ci.code.ValueUtil.asRegister;
 import static jdk.vm.ci.sparc.SPARC.g0;
 
 import org.graalvm.compiler.asm.sparc.SPARCAddress;
 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
+import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister;
+import org.graalvm.compiler.core.common.LIRKind;
 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
+import org.graalvm.compiler.hotspot.HotSpotDebugInfoBuilder;
 import org.graalvm.compiler.lir.LIRFrameState;
 import org.graalvm.compiler.lir.LIRInstructionClass;
 import org.graalvm.compiler.lir.Opcode;
 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
 import org.graalvm.compiler.lir.gen.LIRGeneratorTool;

@@ -37,45 +40,98 @@
 
 import jdk.vm.ci.code.Register;
 import jdk.vm.ci.code.ValueUtil;
 import jdk.vm.ci.code.site.InfopointReason;
 import jdk.vm.ci.meta.AllocatableValue;
+import jdk.vm.ci.meta.Value;
 
 /**
  * Emits a safepoint poll.
  */
 @Opcode("SAFEPOINT")
 public class SPARCHotSpotSafepointOp extends SPARCLIRInstruction {
     public static final LIRInstructionClass<SPARCHotSpotSafepointOp> TYPE = LIRInstructionClass.create(SPARCHotSpotSafepointOp.class);
     public static final SizeEstimate SIZE = SizeEstimate.create(9);
 
     @State protected LIRFrameState state;
-    @Use({OperandFlag.REG}) AllocatableValue safepointPollAddress;
+    @Use({OperandFlag.REG, OperandFlag.ILLEGAL}) AllocatableValue safepointPollAddress;
     private final GraalHotSpotVMConfig config;
+    private final Register thread;
 
-    public SPARCHotSpotSafepointOp(LIRFrameState state, GraalHotSpotVMConfig config, LIRGeneratorTool tool) {
+    public SPARCHotSpotSafepointOp(LIRFrameState state, GraalHotSpotVMConfig config, Register thread, LIRGeneratorTool tool) {
         super(TYPE, SIZE);
         this.state = state;
         this.config = config;
+        this.thread = thread;
         SPARCHotSpotLIRGenerator lirGen = (SPARCHotSpotLIRGenerator) tool;
         safepointPollAddress = lirGen.getSafepointAddressValue();
     }
 
     @Override
     public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
-        emitCode(crb, masm, config, false, state, asRegister(safepointPollAddress));
+        emitCode(crb, masm, config, false, state, thread, safepointPollAddress);
     }
 
-    public static void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm, GraalHotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register safepointPollAddress) {
+    public static void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm, GraalHotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register thread,
+                    Value safepointPollAddress) {
+        if (config.threadLocalHandshakes) {
+            emitThreadLocalPoll(crb, masm, config, atReturn, state, thread);
+        } else {
+            emitGlobalPoll(crb, masm, config, atReturn, state, asRegister(safepointPollAddress));
+        }
+    }
+
+    /**
+     * Emit a global safepoint poll.
+     */
+    private static void emitGlobalPoll(CompilationResultBuilder crb, SPARCMacroAssembler masm, GraalHotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register safepointPollAddress) {
         crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR);
         if (state != null) {
             final int pos = masm.position();
             crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
         }
         masm.ldx(new SPARCAddress(safepointPollAddress, 0), g0);
     }
 
+    /**
+     * Emit a thread-local safepoint poll.
+     */
+    private static void emitThreadLocalPoll(CompilationResultBuilder crb, SPARCMacroAssembler masm, GraalHotSpotVMConfig config, boolean atReturn, LIRFrameState state, Register thread) {
+        assert !atReturn || state == null : "state is unneeded at return";
+
+        assert config.threadPollingPageOffset >= 0;
+
+        try (ScratchRegister scratchReg = masm.getScratchRegister()) {
+            Register scratch = scratchReg.getRegister();
+
+            masm.ldx(new SPARCAddress(thread, config.threadPollingPageOffset), scratch);
+
+            crb.recordMark(atReturn ? config.MARKID_POLL_RETURN_FAR : config.MARKID_POLL_FAR);
+            if (state != null) {
+                final int pos = masm.position();
+                crb.recordInfopoint(pos, state, InfopointReason.SAFEPOINT);
+            }
+            masm.ldx(new SPARCAddress(scratch, 0), g0);
+        }
+    }
+
+    static AllocatableValue getSafepointAddressValue(SPARCHotSpotLIRGenerator gen) {
+        if (gen.config.threadLocalHandshakes) {
+            return Value.ILLEGAL;
+        } else {
+            return gen.newVariable(LIRKind.value(gen.target().arch.getWordKind()));
+        }
+    }
+
+    static void emitPrologue(SPARCHotSpotNodeLIRBuilder lir, SPARCHotSpotLIRGenerator gen) {
+        if (!gen.config.threadLocalHandshakes) {
+            AllocatableValue var = gen.getSafepointAddressValue();
+            lir.append(new SPARCHotSpotSafepointOp.SPARCLoadSafepointPollAddress(var, gen.config));
+            gen.append(((HotSpotDebugInfoBuilder) lir.getDebugInfoBuilder()).lockStack());
+        }
+    }
+
     public static class SPARCLoadSafepointPollAddress extends SPARCLIRInstruction {
         public static final LIRInstructionClass<SPARCLoadSafepointPollAddress> TYPE = LIRInstructionClass.create(SPARCLoadSafepointPollAddress.class);
         public static final SizeEstimate SIZE = SizeEstimate.create(2);
 
         @Def({OperandFlag.REG}) protected AllocatableValue result;