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

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.module.PythonModule;
import com.oracle.graal.python.builtins.objects.type.PythonManagedClass;
import com.oracle.graal.python.nodes.PGuards;
import com.oracle.graal.python.nodes.util.CastToJavaStringNode;
import com.oracle.graal.python.runtime.PythonOptions;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.DynamicObjectLibrary;
import com.oracle.truffle.api.object.HiddenKey;
import com.oracle.truffle.api.object.Location;
import com.oracle.truffle.api.object.Shape;

@ImportStatic({PGuards.class, PythonOptions.class})
@GenerateUncached
public abstract class ReadAttributeFromDynamicObjectNode extends ObjectAttributeNode {
    public static ReadAttributeFromDynamicObjectNode create() {
        return ReadAttributeFromDynamicObjectNodeGen.create();
    }

    public static ReadAttributeFromDynamicObjectNode getUncached() {
        return ReadAttributeFromDynamicObjectNodeGen.getUncached();
    }

    public abstract Object execute(Object object, Object key);

    public abstract Object execute(Object object, HiddenKey key);

    protected static Object getAttribute(DynamicObject object, String key) {
        return DynamicObjectLibrary.getUncached().getOrDefault(object, key, PNone.NO_VALUE);
    }

    protected static boolean isLongLivedObject(DynamicObject object) {
        return object instanceof PythonModule || object instanceof PythonManagedClass;
    }

    @SuppressWarnings("unused")
    @Specialization(limit = "1", //
                    guards = {
                                    "dynamicObject == cachedObject",
                                    "isLongLivedObject(cachedObject)",
                                    "key == cachedKey",
                                    "dynamicObject.getShape() == cachedShape",
                                    "loc != null",
                                    "loc.isAssumedFinal()"
                    }, //
                    assumptions = {"singleContextAssumption()", "cachedShape.getValidAssumption()", "loc.getFinalAssumption()"})
    protected Object readFinalAttr(DynamicObject dynamicObject, String key,
                    @Cached("key") String cachedKey,
                    @Cached(value = "dynamicObject", weak = true) DynamicObject cachedObject,
                    @Cached("dynamicObject.getShape()") Shape cachedShape,
                    @Cached("getLocationOrNull(cachedShape.getProperty(cachedKey))") Location loc,
                    @Cached("dynamicObject.getShape().getPropertyAssumption(key)") Assumption propertyAssumption,
                    @Cached(value = "getAttribute(dynamicObject, key)", weak = true) Object value) {
        return value;
    }

    @Specialization(limit = "getAttributeAccessInlineCacheMaxDepth()", replaces = "readFinalAttr")
    protected Object readDirect(DynamicObject dynamicObject, String key,
                    @CachedLibrary("dynamicObject") DynamicObjectLibrary dylib) {
        return dylib.getOrDefault(dynamicObject, key, PNone.NO_VALUE);
    }

    @Specialization(guards = "isHiddenKey(key)", limit = "getAttributeAccessInlineCacheMaxDepth()")
    protected Object readDirectHidden(DynamicObject dynamicObject, Object key,
                    @CachedLibrary("dynamicObject") DynamicObjectLibrary dylib) {
        return dylib.getOrDefault(dynamicObject, key, PNone.NO_VALUE);
    }

    @Specialization(guards = "!isHiddenKey(key)", replaces = {"readDirect", "readFinalAttr"}, limit = "getAttributeAccessInlineCacheMaxDepth()")
    protected Object read(DynamicObject dynamicObject, Object key,
                    @Cached CastToJavaStringNode castNode,
                    @CachedLibrary("dynamicObject") DynamicObjectLibrary dylib) {
        return dylib.getOrDefault(dynamicObject, attrKey(key, castNode), PNone.NO_VALUE);
    }
}
