/*

 * 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

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package org.graalvm.compiler.lir.framemap;

import static org.graalvm.compiler.lir.LIRValueUtil.isVirtualStackSlot;

import java.util.ArrayList;

import java.util.BitSet;

import java.util.EnumSet;

import java.util.List;

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

import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.lir.InstructionValueConsumer;

import org.graalvm.compiler.lir.LIR;

import org.graalvm.compiler.lir.LIRInstruction;

import org.graalvm.compiler.lir.LIRInstruction.OperandFlag;

import org.graalvm.compiler.lir.LIRInstruction.OperandMode;

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.JavaKind;

import jdk.vm.ci.meta.Value;

import jdk.vm.ci.meta.ValueKind;

/**

 * A FrameMapBuilder that records allocation.

 */

public class FrameMapBuilderImpl extends FrameMapBuilderTool {

    private final RegisterConfig registerConfig;

    private final CodeCacheProvider codeCache;

    private final FrameMap frameMap;

    private final List<VirtualStackSlot> stackSlots;

    private final List<CallingConvention> calls;

    private int numStackSlots;

    public FrameMapBuilderImpl(FrameMap frameMap, CodeCacheProvider codeCache, RegisterConfig registerConfig) {

        assert registerConfig != null : "No register config!";

        this.registerConfig = registerConfig == null ? codeCache.getRegisterConfig() : registerConfig;

        this.codeCache = codeCache;

        this.frameMap = frameMap;

        this.stackSlots = new ArrayList<>();

        this.calls = new ArrayList<>();

        this.numStackSlots = 0;

    }

    @Override

    public VirtualStackSlot allocateSpillSlot(ValueKind<?> kind) {

        SimpleVirtualStackSlot slot = new SimpleVirtualStackSlot(numStackSlots++, kind);

        stackSlots.add(slot);

        return slot;

    }

    @Override

    public VirtualStackSlot allocateStackSlots(int slots, BitSet objects, List<VirtualStackSlot> outObjectStackSlots) {

        if (slots == 0) {

            return null;

        }

        if (outObjectStackSlots != null) {

            throw GraalError.unimplemented();

        }

        VirtualStackSlotRange slot = new VirtualStackSlotRange(numStackSlots++, slots, objects, LIRKind.fromJavaKind(frameMap.getTarget().arch, JavaKind.Object));

        stackSlots.add(slot);

        return slot;

    }

    @Override

    public RegisterConfig getRegisterConfig() {

        return registerConfig;

    }

    @Override

    public CodeCacheProvider getCodeCache() {

        return codeCache;

    }

    @Override

    public FrameMap getFrameMap() {

        return frameMap;

    }

    @Override

    public int getNumberOfStackSlots() {

        return numStackSlots;

    }

    @Override

    public void callsMethod(CallingConvention cc) {

        calls.add(cc);

    }

    @Override

    @SuppressWarnings("try")

    public FrameMap buildFrameMap(LIRGenerationResult res) {

        DebugContext debug = res.getLIR().getDebug();

        if (debug.areScopesEnabled()) {

            verifyStackSlotAllocation(res);

        }

        for (CallingConvention cc : calls) {

            frameMap.callsMethod(cc);

        }

        frameMap.finish();

        return frameMap;

    }

    private static void verifyStackSlotAllocation(LIRGenerationResult res) {

        LIR lir = res.getLIR();

        InstructionValueConsumer verifySlots = (LIRInstruction op, Value value, OperandMode mode, EnumSet<OperandFlag> flags) -> {

            assert !isVirtualStackSlot(value) : String.format("Instruction %s contains a virtual stack slot %s", op, value);

        };

        for (AbstractBlockBase<?> block : lir.getControlFlowGraph().getBlocks()) {

            lir.getLIRforBlock(block).forEach(op -> {

                op.visitEachInput(verifySlots);

                op.visitEachAlive(verifySlots);

                op.visitEachState(verifySlots);

                op.visitEachTemp(verifySlots);

                op.visitEachOutput(verifySlots);

            });

        }

    }

    @Override

    public List<VirtualStackSlot> getStackSlots() {

        return stackSlots;

    }

}