JDK14/Java14源码在线阅读

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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.lir.framemap;

import org.graalvm.compiler.lir.VirtualStackSlot;
import org.graalvm.compiler.lir.gen.LIRGenerationResult;

import jdk.vm.ci.code.CallingConvention;
import jdk.vm.ci.code.CodeCacheProvider;
import jdk.vm.ci.code.RegisterConfig;
import jdk.vm.ci.meta.ValueKind;

/**
 * A {@link FrameMapBuilder} is used to collect all information necessary to
 * {@linkplain #buildFrameMap create} a {@link FrameMap}.
 */
public abstract class FrameMapBuilder {

    /**
     * Reserves a spill slot in the frame of the method being compiled. The returned slot is aligned
     * on its natural alignment, i.e., an 8-byte spill slot is aligned at an 8-byte boundary, unless
     * overridden by a subclass.
     *
     * @param kind The kind of the spill slot to be reserved.
     * @return A spill slot denoting the reserved memory area.
     */
    public abstract VirtualStackSlot allocateSpillSlot(ValueKind<?> kind);

    /**
     * Reserves a number of contiguous slots in the frame of the method being compiled. If the
     * requested number of slots is 0, this method returns {@code null}.
     *
     * @param slots the number of slots to reserve
     * @return the first reserved stack slot (i.e., at the lowest address)
     */
    public abstract VirtualStackSlot allocateStackSlots(int slots);

    public abstract RegisterConfig getRegisterConfig();

    public abstract CodeCacheProvider getCodeCache();

    /**
     * Informs the frame map that the compiled code calls a particular method, which may need stack
     * space for outgoing arguments.
     *

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