Example #1
0
        /// <summary>
        /// Rewrite an async method into a state machine type.
        /// </summary>
        internal static BoundStatement Rewrite(
            BoundStatement body,
            MethodSymbol method,
            int methodOrdinal,
            VariableSlotAllocator slotAllocatorOpt,
            TypeCompilationState compilationState,
            DiagnosticBag diagnostics,
            out AsyncStateMachine stateMachineType)
        {
            if (!method.IsAsync)
            {
                stateMachineType = null;
                return body;
            }

            // The CLR doesn't support adding fields to structs, so in order to enable EnC in an async method we need to generate a class.
            var typeKind = compilationState.Compilation.Options.EnableEditAndContinue ? TypeKind.Class : TypeKind.Struct;

            var bodyWithAwaitLifted = AwaitExpressionSpiller.Rewrite(body, method, compilationState, diagnostics);

            stateMachineType = new AsyncStateMachine(slotAllocatorOpt, compilationState, method, methodOrdinal, typeKind);
            compilationState.ModuleBuilderOpt.CompilationState.SetStateMachineType(method, stateMachineType);
            var rewriter = new AsyncRewriter(bodyWithAwaitLifted, method, methodOrdinal, stateMachineType, slotAllocatorOpt, compilationState, diagnostics);

            if (!rewriter.VerifyPresenceOfRequiredAPIs())
            {
                return body;
            }

            return rewriter.Rewrite();
        }
Example #2
0
        /// <summary>
        /// Rewrite an async method into a state machine class.
        /// </summary>
        /// <param name="body">The original body of the method</param>
        /// <param name="method">The method's identity</param>
        /// <param name="compilationState">The collection of generated methods that result from this transformation and which must be emitted</param>
        /// <param name="diagnostics">Diagnostic bag for diagnostics.</param>
        /// <param name="generateDebugInfo"></param>
        /// <param name="stateMachineType"></param>
        internal static BoundStatement Rewrite(
            BoundStatement body,
            MethodSymbol method,
            TypeCompilationState compilationState,
            DiagnosticBag diagnostics,
            bool generateDebugInfo,
            out AsyncStateMachine stateMachineType)
        {
            if (!method.IsAsync)
            {
                stateMachineType = null;
                return body;
            }

            // The CLR doesn't support adding fields to structs, so in order to enable EnC in an async method we need to generate a class.
            var typeKind = compilationState.Compilation.Options.EnableEditAndContinue ? TypeKind.Class : TypeKind.Struct;

            var bodyWithAwaitLifted = AwaitLiftingRewriter.Rewrite(body, method, compilationState, diagnostics);

            stateMachineType = new AsyncStateMachine(method, typeKind);
            compilationState.ModuleBuilderOpt.CompilationState.SetStateMachineType(method, stateMachineType);
            var rewriter = new AsyncRewriter(bodyWithAwaitLifted, method, stateMachineType, compilationState, diagnostics, generateDebugInfo);
            if (!rewriter.constructedSuccessfully)
            {
                return body;
            }

            return rewriter.Rewrite();
        }
Example #3
0
 private AsyncRewriter(
     BoundStatement body,
     MethodSymbol method,
     int methodOrdinal,
     AsyncStateMachine stateMachineType,
     VariableSlotAllocator slotAllocatorOpt,
     TypeCompilationState compilationState,
     DiagnosticBag diagnostics)
     : base(body, method, stateMachineType, slotAllocatorOpt, compilationState, diagnostics)
 {
     _constructedSuccessfully = AsyncMethodBuilderMemberCollection.TryCreate(F, method, this.stateMachineType.TypeMap, out _asyncMethodBuilderMemberCollection);
     _methodOrdinal = methodOrdinal;
     _ignoreAccessibility = compilationState.ModuleBuilderOpt.IgnoreAccessibility;
 }
 private AsyncRewriter(
     BoundStatement body,
     MethodSymbol method,
     AsyncStateMachine stateMachineClass,
     TypeCompilationState compilationState,
     DiagnosticBag diagnostics)
     : base(body, method, stateMachineClass, compilationState, diagnostics)
 {
     try
     {
         constructedSuccessfully = AsyncMethodBuilderMemberCollection.TryCreate(F, method, this.stateMachineClass.TypeMap, out this.asyncMethodBuilderMemberCollection);
     }
     catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
     {
         diagnostics.Add(ex.Diagnostic);
         constructedSuccessfully = false;
     }
 }
Example #5
0
        private AsyncRewriter(
            BoundStatement body,
            MethodSymbol method,
            int methodOrdinal,
            AsyncStateMachine stateMachineType,
            VariableSlotAllocator slotAllocatorOpt,
            TypeCompilationState compilationState,
            DiagnosticBag diagnostics)
            : base(body, method, stateMachineType, slotAllocatorOpt, compilationState, diagnostics)
        {
            try
            {
                _constructedSuccessfully = AsyncMethodBuilderMemberCollection.TryCreate(F, method, this.stateMachineType.TypeMap, out _asyncMethodBuilderMemberCollection);
            }
            catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
            {
                diagnostics.Add(ex.Diagnostic);
                _constructedSuccessfully = false;
            }

            _methodOrdinal = methodOrdinal;
            _ignoreAccessibility = compilationState.ModuleBuilderOpt.IgnoreAccessibility;
        }
 internal AsyncConstructor(AsyncStateMachine stateMachineType)
     : base(stateMachineType)
 {
 }