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

import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;

import com.oracle.graal.python.PythonLanguage;
import com.oracle.graal.python.builtins.objects.common.SequenceNodes.GetObjectArrayNode;
import com.oracle.graal.python.builtins.objects.common.SequenceStorageNodes;
import com.oracle.graal.python.builtins.objects.list.PList;
import com.oracle.graal.python.builtins.objects.object.PythonObject;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.nodes.BuiltinNames;
import com.oracle.graal.python.nodes.ErrorMessages;
import com.oracle.graal.python.nodes.IndirectCallNode;
import com.oracle.graal.python.nodes.PGuards;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.SpecialMethodNames;
import com.oracle.graal.python.nodes.attributes.LookupInheritedAttributeNode;
import com.oracle.graal.python.nodes.attributes.ReadAttributeFromObjectNode;
import com.oracle.graal.python.nodes.builtins.ListNodes.ConstructListNode;
import com.oracle.graal.python.nodes.call.CallNode;
import com.oracle.graal.python.nodes.expression.CastToListExpressionNodeGen.CastToListNodeGen;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.nodes.object.IsBuiltinClassProfile;
import com.oracle.graal.python.runtime.ExecutionContext.IndirectCallContext;
import com.oracle.graal.python.runtime.PythonContext;
import com.oracle.graal.python.runtime.exception.PException;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.graal.python.runtime.sequence.storage.SequenceStorage;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.Truffle;
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.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeCost;

public abstract class CastToListExpressionNode extends UnaryOpNode {

    @Specialization
    static PList doObject(VirtualFrame frame, Object value,
                    @Cached CastToListNode castToListNode) {
        return castToListNode.execute(frame, value);
    }

    @ImportStatic(PGuards.class)
    public abstract static class CastToListNode extends Node implements IndirectCallNode {
        @Child private SequenceStorageNodes.LenNode lenNode;
        @Child private SequenceStorageNodes.GetItemNode getItemNode;
        private final Assumption dontNeedExceptionState = Truffle.getRuntime().createAssumption();
        private final Assumption dontNeedCallerFrame = Truffle.getRuntime().createAssumption();

        @Override
        public Assumption needNotPassFrameAssumption() {
            return dontNeedCallerFrame;
        }

        @Override
        public Assumption needNotPassExceptionAssumption() {
            return dontNeedExceptionState;
        }

        public abstract PList execute(VirtualFrame frame, Object list);

        protected PythonLanguage getLanguage() {
            return PythonLanguage.get(this);
        }

        @Specialization(guards = {"cannotBeOverridden(v, getClassNode)", "cachedLength == getLength(v)", "cachedLength < 32"}, limit = "2")
        @ExplodeLoop
        protected PList starredTupleCachedLength(VirtualFrame frame, PTuple v,
                        @SuppressWarnings("unused") @Cached GetClassNode getClassNode,
                        @Cached PythonObjectFactory factory,
                        @Cached("getLength(v)") int cachedLength) {
            SequenceStorage s = v.getSequenceStorage();
            Object[] array = new Object[cachedLength];
            for (int i = 0; i < cachedLength; i++) {
                array[i] = getGetItemNode().execute(frame, s, i);
            }
            return factory.createList(array);
        }

        @Specialization(replaces = "starredTupleCachedLength", guards = "cannotBeOverridden(v, getClassNode)", limit = "1")
        protected PList starredTuple(PTuple v,
                        @SuppressWarnings("unused") @Cached GetClassNode getClassNode,
                        @Cached PythonObjectFactory factory,
                        @Cached GetObjectArrayNode getObjectArrayNode) {
            return factory.createList(getObjectArrayNode.execute(v).clone());
        }

        @Specialization(guards = "cannotBeOverridden(v, getClassNode)", limit = "1")
        protected PList starredList(PList v,
                        @SuppressWarnings("unused") @Cached GetClassNode getClassNode) {
            return v;
        }

        @Specialization(rewriteOn = PException.class)
        protected PList starredIterable(VirtualFrame frame, PythonObject value,
                        @Cached ConstructListNode constructListNode) {
            PythonLanguage language = getLanguage();
            Object state = IndirectCallContext.enter(frame, language, PythonContext.get(this), this);
            try {
                return constructListNode.execute(frame, value);
            } finally {
                IndirectCallContext.exit(frame, language, PythonContext.get(this), state);
            }
        }

        @Specialization
        protected PList starredGeneric(VirtualFrame frame, Object v,
                        @Cached ConstructListNode constructListNode,
                        @Cached IsBuiltinClassProfile attrProfile,
                        @Cached PRaiseNode raise) {
            PythonLanguage language = getLanguage();
            Object state = IndirectCallContext.enter(frame, language, PythonContext.get(this), this);
            try {
                return constructListNode.execute(frame, v);
            } catch (PException e) {
                e.expectAttributeError(attrProfile);
                throw raise.raise(TypeError, ErrorMessages.OBJ_NOT_ITERABLE, v);
            } finally {
                IndirectCallContext.exit(frame, language, PythonContext.get(this), state);
            }
        }

        protected int getLength(PTuple t) {
            if (lenNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                lenNode = insert(SequenceStorageNodes.LenNode.create());
            }
            return lenNode.execute(t.getSequenceStorage());
        }

        protected SequenceStorageNodes.GetItemNode getGetItemNode() {
            if (getItemNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                getItemNode = insert(SequenceStorageNodes.GetItemNode.createNotNormalized());
            }
            return getItemNode;
        }

        public static CastToListNode create() {
            return CastToListNodeGen.create();
        }

    }

    public abstract static class CastToListInteropNode extends PNodeWithContext {

        public abstract PList executeWithGlobalState(Object list);

        public static CastToListInteropNode create() {
            return new CastToListCachedNode();
        }

        public static CastToListInteropNode getUncached() {
            return CastToListUncachedNode.UNCACHED;
        }
    }

    private static final class CastToListCachedNode extends CastToListInteropNode {

        @Child private CastToListNode castToListNode = CastToListNode.create();

        @Override
        public PList executeWithGlobalState(Object list) {
            // NOTE: it is fine to pass 'null' frame because this is a node with global state that
            // forces the caller to take care of it
            return castToListNode.execute(null, list);
        }

    }

    private static final class CastToListUncachedNode extends CastToListInteropNode {
        private static final CastToListUncachedNode UNCACHED = new CastToListUncachedNode();

        @Override
        public PList executeWithGlobalState(Object list) {
            Object builtins = PythonContext.get(this).getBuiltins();
            Object listType = ReadAttributeFromObjectNode.getUncached().execute(builtins, BuiltinNames.T_LIST);
            LookupInheritedAttributeNode.Dynamic getCall = LookupInheritedAttributeNode.Dynamic.getUncached();
            return (PList) CallNode.getUncached().execute(null, getCall.execute(listType, SpecialMethodNames.T___CALL__), listType, list);
        }

        @Override
        public NodeCost getCost() {
            return NodeCost.MEGAMORPHIC;
        }

        @Override
        public boolean isAdoptable() {
            return false;
        }
    }
}
