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 * Copyright (c) 2012, 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

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package org.graalvm.compiler.hotspot;

import jdk.vm.ci.meta.InvokeTarget;

import org.graalvm.compiler.core.common.LocationIdentity;

import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;

import org.graalvm.compiler.core.target.Backend;

import org.graalvm.compiler.hotspot.stubs.Stub;

/**

 * The details required to link a HotSpot runtime or stub call.

 */

public interface HotSpotForeignCallLinkage extends ForeignCallLinkage, InvokeTarget {

    /**

     * Constants for specifying whether a foreign call destroys or preserves registers. A foreign

     * call will always destroy {@link HotSpotForeignCallLinkage#getOutgoingCallingConvention() its}

     * {@linkplain ForeignCallLinkage#getTemporaries() temporary} registers.

     */

    enum RegisterEffect {

        DESTROYS_REGISTERS,

        PRESERVES_REGISTERS

    }

    /**

     * Constants for specifying whether a call is a leaf or not and whether a

     * {@code JavaFrameAnchor} prologue and epilogue is required around the call. A leaf function

     * does not lock, GC or throw exceptions.

     */

    enum Transition {

        /**

         * A call to a leaf function that is guaranteed to not use floating point registers and will

         * never have its caller stack inspected by the VM. That is, {@code JavaFrameAnchor}

         * management around the call can be omitted.

         */

        LEAF_NOFP,

        /**

         * A call to a leaf function that might use floating point registers but will never have its

         * caller stack inspected. That is, {@code JavaFrameAnchor} management around the call can

         * be omitted.

         */

        LEAF,

        /**

         * A call to a leaf function that might use floating point registers and may have its caller

         * stack inspected. That is, {@code JavaFrameAnchor} management code around the call is

         * required.

         */

        STACK_INSPECTABLE_LEAF,

        /**

         * A function that may lock, GC or raise an exception and thus requires debug info to be

         * associated with a call site to the function. The execution stack may be inspected while

         * in the called function. That is, {@code JavaFrameAnchor} management code around the call

         * is required.

         */

        SAFEPOINT,

    }

    /**

     * Sentinel marker for a computed jump address.

     */

    long JUMP_ADDRESS = 0xDEADDEADBEEFBEEFL;

    boolean isReexecutable();

    LocationIdentity[] getKilledLocations();

    void setCompiledStub(Stub stub);

    /**

     * Determines if this is a call to a compiled {@linkplain Stub stub}.

     */

    boolean isCompiledStub();

    void finalizeAddress(Backend backend);

    long getAddress();

    /**

     * Determines if the runtime function or stub might use floating point registers. If the answer

     * is no, then no FPU state management prologue or epilogue needs to be emitted around the call.

     */

    boolean mayContainFP();

    /**

     * Determines if a {@code JavaFrameAnchor} needs to be set up and torn down around this call.

     */

    boolean needsJavaFrameAnchor();

    /**

     * Gets the VM symbol associated with the target {@linkplain #getAddress() address} of the call.

     */

    String getSymbol();

    /**

     * Identifies foreign calls which are guaranteed to include a safepoint check.

     */

    boolean isGuaranteedSafepoint();

}