--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.sparc/src/org/graalvm/compiler/hotspot/sparc/SPARCHotSpotReturnOp.java	2020-05-01 02:30:52.689750220 -0700
+++ /dev/null	2020-03-09 18:57:19.455001459 -0700
@@ -1,103 +0,0 @@
-/*
- * Copyright (c) 2012, 2018, 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.sparc;
-
-import static jdk.vm.ci.sparc.SPARC.sp;
-import static org.graalvm.compiler.hotspot.HotSpotHostBackend.ENABLE_STACK_RESERVED_ZONE;
-import static org.graalvm.compiler.hotspot.HotSpotHostBackend.THROW_DELAYED_STACKOVERFLOW_ERROR;
-import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL;
-import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
-
-import org.graalvm.compiler.asm.Label;
-import org.graalvm.compiler.asm.sparc.SPARCAddress;
-import org.graalvm.compiler.asm.sparc.SPARCAssembler;
-import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
-import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler.ScratchRegister;
-import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;
-import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
-import org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProvider;
-import org.graalvm.compiler.lir.LIRInstructionClass;
-import org.graalvm.compiler.lir.Opcode;
-import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
-import org.graalvm.compiler.lir.sparc.SPARCCall;
-import org.graalvm.compiler.lir.sparc.SPARCControlFlow.ReturnOp;
-
-import jdk.vm.ci.code.CallingConvention;
-import jdk.vm.ci.code.Register;
-import jdk.vm.ci.code.RegisterValue;
-import jdk.vm.ci.meta.Value;
-
-/**
- * Returns from a function.
- */
-@Opcode("RETURN")
-final class SPARCHotSpotReturnOp extends SPARCHotSpotEpilogueOp {
-    public static final LIRInstructionClass<SPARCHotSpotReturnOp> TYPE = LIRInstructionClass.create(SPARCHotSpotReturnOp.class);
-    public static final SizeEstimate SIZE = SizeEstimate.create(2);
-
-    @Use({REG, ILLEGAL}) protected Value value;
-    @Use({REG, ILLEGAL}) protected Value safepointPollAddress;
-    private final boolean requiresReservedStackAccessCheck;
-    private final boolean isStub;
-    private final GraalHotSpotVMConfig config;
-    private final Register thread;
-
-    SPARCHotSpotReturnOp(Value value, boolean isStub, GraalHotSpotVMConfig config, Register thread, Value safepointPoll, boolean requiresReservedStackAccessCheck) {
-        super(TYPE, SIZE);
-        this.value = value;
-        this.isStub = isStub;
-        this.config = config;
-        this.thread = thread;
-        this.safepointPollAddress = safepointPoll;
-        this.requiresReservedStackAccessCheck = requiresReservedStackAccessCheck;
-    }
-
-    @Override
-    public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
-        if (!isStub) {
-            if (requiresReservedStackAccessCheck) {
-                try (ScratchRegister sc = masm.getScratchRegister()) {
-                    HotSpotForeignCallsProvider foreignCalls = (HotSpotForeignCallsProvider) crb.foreignCalls;
-                    Label noReserved = new Label();
-                    Register scratch = sc.getRegister();
-                    masm.ldx(new SPARCAddress(thread, config.javaThreadReservedStackActivationOffset), scratch);
-                    masm.compareBranch(sp, scratch, SPARCAssembler.ConditionFlag.LessUnsigned, SPARCAssembler.CC.Xcc, noReserved, SPARCAssembler.BranchPredict.PREDICT_TAKEN, null);
-                    ForeignCallLinkage enableStackReservedZone = foreignCalls.lookupForeignCall(ENABLE_STACK_RESERVED_ZONE);
-                    CallingConvention cc = enableStackReservedZone.getOutgoingCallingConvention();
-                    assert cc.getArgumentCount() == 1;
-                    Register arg0 = ((RegisterValue) cc.getArgument(0)).getRegister();
-                    masm.mov(thread, arg0);
-                    SPARCCall.directCall(crb, masm, enableStackReservedZone, scratch, null);
-                    masm.restoreWindow();
-                    SPARCCall.indirectJmp(crb, masm, scratch, foreignCalls.lookupForeignCall(THROW_DELAYED_STACKOVERFLOW_ERROR));
-                    masm.bind(noReserved);
-                }
-            }
-            // Every non-stub compile method must have a poll before the return.
-            SPARCHotSpotSafepointOp.emitCode(crb, masm, config, true, null, thread, safepointPollAddress);
-        }
-        ReturnOp.emitCodeHelper(crb, masm);
-    }
-}