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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.nodes.cast;

import java.util.Set;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.GlobalObjectNode;
import com.oracle.truffle.js.nodes.unary.JSUnaryNode;
import com.oracle.truffle.js.runtime.BigInt;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.Symbol;
import com.oracle.truffle.js.runtime.builtins.JSBigInt;
import com.oracle.truffle.js.runtime.builtins.JSBoolean;
import com.oracle.truffle.js.runtime.builtins.JSNumber;
import com.oracle.truffle.js.runtime.builtins.JSString;
import com.oracle.truffle.js.runtime.builtins.JSSymbol;
import com.oracle.truffle.js.runtime.objects.JSLazyString;

Implementation of ECMAScript 5.1, 10.4.3 Entering Function Code, for non-strict callees.
Converts the caller provided thisArg to the ThisBinding of the callee's execution context,
replacing null or undefined with the global object and performing ToObject on primitives.
/**
 * Implementation of ECMAScript 5.1, 10.4.3 Entering Function Code, for non-strict callees.
 *
 * Converts the caller provided thisArg to the ThisBinding of the callee's execution context,
 * replacing null or undefined with the global object and performing ToObject on primitives.
 */
@ImportStatic({JSConfig.class})
public abstract class JSPrepareThisNode extends JSUnaryNode {

    final JSContext context;

    protected JSPrepareThisNode(JSContext context, JavaScriptNode child) {
        super(child);
        this.context = context;
    }

    public static JSPrepareThisNode createPrepareThisBinding(JSContext context, JavaScriptNode child) {
        return JSPrepareThisNodeGen.create(context, child);
    }

    @Specialization(guards = "isNullOrUndefined(object)")
    protected DynamicObject doJSObject(@SuppressWarnings("unused") Object object) {
        return GlobalObjectNode.getGlobalObject(context);
    }

    @SuppressWarnings("unused")
    @Specialization(guards = {"cachedClass != null", "cachedClass.isInstance(object)"}, limit = "1")
    protected Object doJSObjectCached(Object object,
                    @Cached("getClassIfJSObject(object)") Class<?> cachedClass) {
        return object;
    }

    @Specialization(guards = "isJSObject(object)", replaces = "doJSObjectCached")
    protected DynamicObject doJSObject(DynamicObject object) {
        return object;
    }

    @Specialization
    protected DynamicObject doBoolean(boolean value) {
        return JSBoolean.create(context, value);
    }

    @Specialization
    protected DynamicObject doJSLazyString(JSLazyString value) {
        return JSString.create(context, value);
    }

    @Specialization
    protected DynamicObject doString(String value) {
        return JSString.create(context, value);
    }

    @Specialization
    protected DynamicObject doInt(int value) {
        return JSNumber.create(context, value);
    }

    @Specialization
    protected DynamicObject doDouble(double value) {
        return JSNumber.create(context, value);
    }

    @Specialization
    protected DynamicObject doBigInt(BigInt value) {
        return JSBigInt.create(context, value);
    }

    @Specialization(guards = "isJavaNumber(value)")
    protected DynamicObject doNumber(Object value) {
        return JSNumber.create(context, (Number) value);
    }

    @Specialization
    protected DynamicObject doSymbol(Symbol value) {
        return JSSymbol.create(context, value);
    }

    @Specialization(guards = "isForeignObject(object)", limit = "InteropLibraryLimit")
    protected Object doForeignObject(Object object,
                    @CachedLibrary("object") InteropLibrary interop) {
        if (interop.isNull(object)) {
            return GlobalObjectNode.getGlobalObject(context);
        }
        return object;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return JSPrepareThisNodeGen.create(context, cloneUninitialized(getOperand(), materializedTags));
    }
}