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package com.oracle.graal.python.nodes.frame;

import com.oracle.graal.python.builtins.objects.common.HashingCollectionNodes;
import com.oracle.graal.python.builtins.objects.dict.PDict;
import com.oracle.graal.python.builtins.objects.module.PythonModule;
import com.oracle.graal.python.nodes.attributes.WriteAttributeToObjectNode;
import com.oracle.graal.python.nodes.expression.ExpressionNode;
import com.oracle.graal.python.nodes.statement.StatementNode;
import com.oracle.graal.python.nodes.subscript.SetItemNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;

public abstract class WriteGlobalNode extends StatementNode implements GlobalNode, WriteNode {
    protected final String attributeId;
    @Child private ExpressionNode rhs;

    WriteGlobalNode(String attributeId, ExpressionNode rhs) {
        this.attributeId = attributeId;
        this.rhs = rhs;
    }

    public static WriteGlobalNode create(String attributeId) {
        return WriteGlobalNodeGen.create(attributeId, null);
    }

    public static WriteGlobalNode create(String attributeId, ExpressionNode rhs) {
        return WriteGlobalNodeGen.create(attributeId, rhs);
    }

    @Override
    public final void executeVoid(VirtualFrame frame) {
        executeWithGlobals(frame, getGlobals(frame));
    }

    @Override
    public final void executeBoolean(VirtualFrame frame, boolean value) {
        executeObjectWithGlobals(frame, getGlobals(frame), value);
    }

    @Override
    public final void executeInt(VirtualFrame frame, int value) {
        executeObjectWithGlobals(frame, getGlobals(frame), value);
    }

    @Override
    public final void executeLong(VirtualFrame frame, long value) {
        executeObjectWithGlobals(frame, getGlobals(frame), value);
    }

    @Override
    public final void executeDouble(VirtualFrame frame, double value) {
        executeObjectWithGlobals(frame, getGlobals(frame), value);
    }

    @Override
    public final void executeObject(VirtualFrame frame, Object value) {
        executeObjectWithGlobals(frame, getGlobals(frame), value);
    }

    public final void executeWithGlobals(VirtualFrame frame, Object globals) {
        executeObjectWithGlobals(frame, globals, getRhs().execute(frame));
    }

    public abstract void executeObjectWithGlobals(VirtualFrame frame, Object globals, Object value);

    @Specialization(guards = {"globals == cachedGlobals", "isBuiltinDict(cachedGlobals)"}, assumptions = "singleContextAssumption()", limit = "1")
    void writeDictObjectCached(VirtualFrame frame, @SuppressWarnings("unused") PDict globals, Object value,
                    @Cached(value = "globals", weak = true) PDict cachedGlobals,
                    @Shared("setItemDict") @Cached HashingCollectionNodes.SetItemNode storeNode) {
        storeNode.execute(frame, cachedGlobals, attributeId, value);
    }

    @Specialization(replaces = "writeDictObjectCached", guards = "isBuiltinDict(globals)")
    void writeDictObject(VirtualFrame frame, PDict globals, Object value,
                    @Shared("setItemDict") @Cached HashingCollectionNodes.SetItemNode storeNode) {
        storeNode.execute(frame, globals, attributeId, value);
    }

    @Specialization(replaces = {"writeDictObject", "writeDictObjectCached"})
    void writeGenericDict(VirtualFrame frame, PDict globals, Object value,
                    @Cached SetItemNode storeNode) {
        storeNode.executeWith(frame, globals, attributeId, value);
    }

    @Specialization(guards = {"globals == cachedGlobals"}, assumptions = "singleContextAssumption()", limit = "1")
    void writeModuleCached(@SuppressWarnings("unused") PythonModule globals, Object value,
                    @Cached(value = "globals", weak = true) PythonModule cachedGlobals,
                    @Shared("write") @Cached WriteAttributeToObjectNode write) {
        write.execute(cachedGlobals, attributeId, value);
    }

    @Specialization(replaces = "writeModuleCached")
    void writeModule(PythonModule globals, Object value,
                    @Shared("write") @Cached WriteAttributeToObjectNode write) {
        write.execute(globals, attributeId, value);
    }

    @Override
    public String getAttributeId() {
        return attributeId;
    }

    @Override
    public final ExpressionNode getRhs() {
        return rhs;
    }
}
