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

import com.oracle.graal.python.PythonLanguage;
import com.oracle.graal.python.builtins.objects.cell.PCell;
import com.oracle.graal.python.builtins.objects.function.PArguments;
import com.oracle.graal.python.builtins.objects.function.PBuiltinFunction;
import com.oracle.graal.python.builtins.objects.function.PFunction;
import com.oracle.graal.python.builtins.objects.object.PythonObject;
import com.oracle.graal.python.nodes.generator.GeneratorFunctionRootNode;
import com.oracle.graal.python.runtime.ExecutionContext.CallContext;
import com.oracle.graal.python.runtime.ExecutionContext.IndirectCalleeContext;
import com.oracle.graal.python.runtime.PythonContext;
import com.oracle.graal.python.runtime.PythonContext.PythonThreadState;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.DirectCallNode;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.profiles.ConditionProfile;

public abstract class FunctionInvokeNode extends DirectInvokeNode {
    @Child private DirectCallNode callNode;
    @Child private CallContext callContext;

    // Needed only for generator functions, will be null for builtins
    private final PFunction callee;
    private final PythonObject globals;
    private final PCell[] closure;
    protected final boolean isBuiltin;

    protected FunctionInvokeNode(PFunction callee, CallTarget callTarget, PythonObject globals, PCell[] closure, boolean isBuiltin, boolean isGenerator) {
        this.callee = callee;
        this.callNode = Truffle.getRuntime().createDirectCallNode(callTarget);
        if (isBuiltin && forceSplitBuiltins()) {
            callNode.cloneCallTarget();
        }
        if (isGenerator && shouldInlineGenerators()) {
            this.callNode.forceInlining();
        }
        this.globals = globals;
        this.closure = closure;
        this.isBuiltin = isBuiltin;
        this.callContext = CallContext.create();
    }

    public abstract Object execute(VirtualFrame frame, Object[] arguments);

    @Specialization
    protected Object doDirect(VirtualFrame frame, Object[] arguments,
                    @Cached ConditionProfile isGeneratorFunctionProfile) {
        PArguments.setGlobals(arguments, globals);
        PArguments.setClosure(arguments, closure);
        RootCallTarget ct = (RootCallTarget) callNode.getCurrentCallTarget();
        optionallySetGeneratorFunction(arguments, ct, isGeneratorFunctionProfile, callee);
        if (profileIsNullFrame(frame == null)) {
            PythonThreadState threadState = PythonContext.get(this).getThreadState(PythonLanguage.get(this));
            Object state = IndirectCalleeContext.enter(threadState, arguments, ct);
            try {
                return callNode.call(arguments);
            } finally {
                IndirectCalleeContext.exit(threadState, state);
            }
        } else {
            callContext.prepareCall(frame, arguments, ct, this);
            return callNode.call(arguments);
        }
    }

    public final RootNode getCurrentRootNode() {
        return callNode.getCurrentRootNode();
    }

    @TruffleBoundary
    public static FunctionInvokeNode create(PFunction callee) {
        RootCallTarget callTarget = getCallTarget(callee);
        boolean builtin = isBuiltin(callee);
        return FunctionInvokeNodeGen.create(callee, callTarget, callee.getGlobals(), callee.getClosure(), builtin, callTarget.getRootNode() instanceof GeneratorFunctionRootNode);
    }

    @TruffleBoundary
    public static FunctionInvokeNode create(PBuiltinFunction callee) {
        RootCallTarget callTarget = getCallTarget(callee);
        boolean builtin = isBuiltin(callee);
        return FunctionInvokeNodeGen.create(null, callTarget, null, null, builtin, false);
    }

    /**
     * Same as {@link #create(PBuiltinFunction)} but only providing the call target of the builtin
     * function. Be careful using it. It will never provide globals or a closure to the invoked
     * function!
     */
    @TruffleBoundary
    public static FunctionInvokeNode createBuiltinFunction(RootCallTarget callTarget) {
        return FunctionInvokeNodeGen.create(null, callTarget, null, null, true, false);
    }
}
