001/*
002 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot.amd64;
024
025import static com.oracle.graal.hotspot.HotSpotBackend.*;
026import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
027import static jdk.internal.jvmci.amd64.AMD64.*;
028import static jdk.internal.jvmci.code.ValueUtil.*;
029
030import com.oracle.graal.asm.amd64.*;
031import com.oracle.graal.compiler.common.spi.*;
032import com.oracle.graal.hotspot.stubs.*;
033import com.oracle.graal.lir.*;
034import com.oracle.graal.lir.amd64.*;
035import com.oracle.graal.lir.asm.*;
036import jdk.internal.jvmci.code.*;
037import jdk.internal.jvmci.meta.*;
038
039/**
040 * Removes the current frame and jumps to the {@link UnwindExceptionToCallerStub}.
041 */
042@Opcode("UNWIND")
043final class AMD64HotSpotUnwindOp extends AMD64HotSpotEpilogueBlockEndOp {
044    public static final LIRInstructionClass<AMD64HotSpotUnwindOp> TYPE = LIRInstructionClass.create(AMD64HotSpotUnwindOp.class);
045
046    @Use({REG}) protected RegisterValue exception;
047
048    AMD64HotSpotUnwindOp(RegisterValue exception, AllocatableValue savedRbp) {
049        super(TYPE, savedRbp);
050        this.exception = exception;
051    }
052
053    @Override
054    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
055        leaveFrameAndRestoreRbp(crb, masm);
056
057        ForeignCallLinkage linkage = crb.foreignCalls.lookupForeignCall(UNWIND_EXCEPTION_TO_CALLER);
058        CallingConvention cc = linkage.getOutgoingCallingConvention();
059        assert cc.getArgumentCount() == 2;
060        assert exception.equals(cc.getArgument(0));
061
062        // Get return address (is on top of stack after leave).
063        Register returnAddress = asRegister(cc.getArgument(1));
064        masm.movq(returnAddress, new AMD64Address(rsp, 0));
065
066        AMD64Call.directJmp(crb, masm, linkage);
067    }
068}