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.lir.LIRInstruction.OperandFlag.*;
026import static jdk.internal.jvmci.amd64.AMD64.*;
027import static jdk.internal.jvmci.code.ValueUtil.*;
028
029import com.oracle.graal.asm.amd64.*;
030import com.oracle.graal.asm.amd64.AMD64Assembler.*;
031import com.oracle.graal.lir.*;
032import com.oracle.graal.lir.asm.*;
033
034import jdk.internal.jvmci.code.*;
035import jdk.internal.jvmci.meta.*;
036
037/**
038 * Sets up the arguments for an exception handler in the callers frame, removes the current frame
039 * and jumps to the handler.
040 */
041@Opcode("JUMP_TO_EXCEPTION_HANDLER_IN_CALLER")
042final class AMD64HotSpotJumpToExceptionHandlerInCallerOp extends AMD64HotSpotEpilogueBlockEndOp {
043
044    public static final LIRInstructionClass<AMD64HotSpotJumpToExceptionHandlerInCallerOp> TYPE = LIRInstructionClass.create(AMD64HotSpotJumpToExceptionHandlerInCallerOp.class);
045
046    @Use(REG) AllocatableValue handlerInCallerPc;
047    @Use(REG) AllocatableValue exception;
048    @Use(REG) AllocatableValue exceptionPc;
049    private final Register thread;
050    private final int isMethodHandleReturnOffset;
051
052    AMD64HotSpotJumpToExceptionHandlerInCallerOp(AllocatableValue handlerInCallerPc, AllocatableValue exception, AllocatableValue exceptionPc, int isMethodHandleReturnOffset, Register thread,
053                    AllocatableValue savedRbp) {
054        super(TYPE, savedRbp);
055        this.handlerInCallerPc = handlerInCallerPc;
056        this.exception = exception;
057        this.exceptionPc = exceptionPc;
058        this.isMethodHandleReturnOffset = isMethodHandleReturnOffset;
059        this.thread = thread;
060    }
061
062    @Override
063    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
064        leaveFrameAndRestoreRbp(crb, masm);
065
066        // Discard the return address, thus completing restoration of caller frame
067        masm.incrementq(rsp, 8);
068
069        // Restore rsp from rbp if the exception PC is a method handle call site.
070        AMD64Address dst = new AMD64Address(thread, isMethodHandleReturnOffset);
071        masm.cmpl(dst, 0);
072        masm.cmovq(ConditionFlag.NotEqual, rsp, rbp);
073
074        masm.jmp(asRegister(handlerInCallerPc));
075    }
076}