Pchp.CodeAnalysis.Semantics.Graph.ForeachEnumereeEdge.Generate C# (CSharp) Method

        internal override void Generate(CodeGenerator cg)
        {
            Debug.Assert(this.Enumeree != null);

            // get the enumerator,
            // bind actual MoveNext() and CurrentValue and CurrentKey

            // Template: using(
            // a) enumerator = enumeree.GetEnumerator()
            // b) enumerator = Operators.GetEnumerator(enumeree)
            // ) ...

            cg.EmitSequencePoint(this.Enumeree.PhpSyntax);

            var enumereeType = cg.Emit(this.Enumeree);
            Debug.Assert(enumereeType.SpecialType != SpecialType.System_Void);

            var getEnumeratorMethod = enumereeType.LookupMember<MethodSymbol>(WellKnownMemberNames.GetEnumeratorMethodName);

            TypeSymbol enumeratorType;

            if (enumereeType.IsOfType(cg.CoreTypes.PhpArray))
            {
                cg.Builder.EmitBoolConstant(_aliasedValues);
                
                // PhpArray.GetForeachtEnumerator(bool)
                enumeratorType = cg.EmitCall(ILOpCode.Callvirt, cg.CoreMethods.PhpArray.GetForeachEnumerator_Boolean);  // TODO: IPhpArray
            }
            // TODO: IPhpEnumerable
            // TODO: IPhpArray
            // TODO: Iterator
            else if (getEnumeratorMethod != null && getEnumeratorMethod.ParameterCount == 0 && enumereeType.IsReferenceType)
            {
                // enumeree.GetEnumerator()
                enumeratorType = cg.EmitCall(getEnumeratorMethod.IsVirtual ? ILOpCode.Callvirt : ILOpCode.Call, getEnumeratorMethod);
            }
            else
            {
                cg.EmitConvertToPhpValue(enumereeType, 0);
                cg.Builder.EmitBoolConstant(_aliasedValues);
                cg.EmitCallerRuntimeTypeHandle();

                // Operators.GetForeachEnumerator(PhpValue, bool, RuntimeTypeHandle)
                enumeratorType = cg.EmitCall(ILOpCode.Call, cg.CoreMethods.Operators.GetForeachEnumerator_PhpValue_Bool_RuntimeTypeHandle);
            }

            //
            _current = enumeratorType.LookupMember<PropertySymbol>(WellKnownMemberNames.CurrentPropertyName);   // TODO: Err if no Current
            _currentValue = enumeratorType.LookupMember<PropertySymbol>(_aliasedValues ? "CurrentValueAliased" : "CurrentValue");
            _currentKey = enumeratorType.LookupMember<PropertySymbol>("CurrentKey");
            _disposeMethod = enumeratorType.LookupMember<MethodSymbol>("Dispose", m => m.ParameterCount == 0 && !m.IsStatic);

            //
            _enumeratorLoc = cg.GetTemporaryLocal(enumeratorType);
            cg.Builder.EmitLocalStore(_enumeratorLoc);

            // bind methods
            _moveNextMethod = enumeratorType.LookupMember<MethodSymbol>(WellKnownMemberNames.MoveNextMethodName);    // TODO: Err if there is no MoveNext()
            Debug.Assert(_moveNextMethod.ReturnType.SpecialType == SpecialType.System_Boolean);
            Debug.Assert(_moveNextMethod.IsStatic == false);

            if (_disposeMethod != null)
            {
                /* Template: try { body } finally { enumerator.Dispose }
                 */

                // try {
                cg.Builder.AssertStackEmpty();
                cg.Builder.OpenLocalScope(ScopeType.TryCatchFinally);
                cg.Builder.OpenLocalScope(ScopeType.Try);

                //
                EmitBody(cg);

                // }
                cg.Builder.CloseLocalScope();   // /Try

                // finally {
                cg.Builder.OpenLocalScope(ScopeType.Finally);

                // enumerator.Dispose() & cleanup
                EmitDisposeAndClean(cg);

                // }
                cg.Builder.CloseLocalScope();   // /Finally
                cg.Builder.CloseLocalScope();   // /TryCatchFinally
            }
            else
            {
                EmitBody(cg);
                EmitDisposeAndClean(cg);
            }
        }