-//
+//
// async.cs: Asynchronous functions
//
// Author:
// Dual licensed under the terms of the MIT X11 or GNU GPL
//
// Copyright 2011 Novell, Inc.
+// Copyright 2011-2012 Xamarin Inc.
//
using System;
using System.Collections;
#if STATIC
+using IKVM.Reflection;
using IKVM.Reflection.Emit;
#else
+using System.Reflection;
using System.Reflection.Emit;
#endif
namespace Mono.CSharp
{
- class Await : ExpressionStatement
+ public class Await : ExpressionStatement
{
Expression expr;
AwaitStatement stmt;
this.loc = loc;
}
+ public Expression Expr {
+ get {
+ return expr;
+ }
+ }
+
+ public AwaitStatement Statement {
+ get {
+ return stmt;
+ }
+ }
+
protected override void CloneTo (CloneContext clonectx, Expression target)
{
var t = (Await) target;
protected override Expression DoResolve (ResolveContext rc)
{
- if (rc.HasSet (ResolveContext.Options.FinallyScope)) {
- rc.Report.Error (1984, loc,
- "The `await' operator cannot be used in the body of a finally clause");
- }
-
- if (rc.HasSet (ResolveContext.Options.CatchScope)) {
- rc.Report.Error (1985, loc,
- "The `await' operator cannot be used in the body of a catch clause");
- }
-
if (rc.HasSet (ResolveContext.Options.LockScope)) {
rc.Report.Error (1996, loc,
"The `await' operator cannot be used in the body of a lock statement");
}
- if (rc.HasSet (ResolveContext.Options.ExpressionTreeConversion)) {
- rc.Report.Error (1989, loc, "An expression tree cannot contain an await operator");
- return null;
- }
-
if (rc.IsUnsafe) {
- // TODO: New error code
- rc.Report.Error (-1900, loc,
+ rc.Report.Error (4004, loc,
"The `await' operator cannot be used in an unsafe context");
}
var bc = (BlockContext) rc;
- if (!bc.CurrentBlock.ParametersBlock.IsAsync) {
- // TODO: Should check for existence of await type but
- // what to do with it
- }
-
stmt = new AwaitStatement (expr, loc);
if (!stmt.Resolve (bc))
return null;
public override void Emit (EmitContext ec)
{
stmt.EmitPrologue (ec);
- stmt.Emit (ec);
+
+ using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
+ stmt.Emit (ec);
+ }
}
public override Expression EmitToField (EmitContext ec)
{
stmt.EmitStatement (ec);
}
+
+ public override object Accept (StructuralVisitor visitor)
+ {
+ return visitor.Visit (this);
+ }
}
- class AwaitStatement : YieldStatement<AsyncInitializer>
+
public class AwaitStatement : YieldStatement<AsyncInitializer>
{
- sealed class AwaitableMemberAccess : MemberAccess
+ public sealed class AwaitableMemberAccess : MemberAccess
{
public AwaitableMemberAccess (Expression expr)
: base (expr, "GetAwaiter")
{
}
+ public bool ProbingMode { get; set; }
+
protected override void Error_TypeDoesNotContainDefinition (ResolveContext rc, TypeSpec type, string name)
{
- Error_WrongGetAwaiter (rc, loc, type);
+ Error_OperatorCannotBeApplied (rc, type);
}
protected override void Error_OperatorCannotBeApplied (ResolveContext rc, TypeSpec type)
{
- rc.Report.Error (1991, loc, "Cannot await `{0}' expression", type.GetSignatureForError ());
+ if (ProbingMode)
+ return;
+
+ var invocation = LeftExpression as Invocation;
+ if (invocation != null && invocation.MethodGroup != null && (invocation.MethodGroup.BestCandidate.Modifiers & Modifiers.ASYNC) != 0) {
+ rc.Report.Error (4008, loc, "Cannot await void method `{0}'. Consider changing method return type to `Task'",
+ invocation.GetSignatureForError ());
+ } else {
+ rc.Report.Error (4001, loc, "Cannot await `{0}' expression", type.GetSignatureForError ());
+ }
}
}
}
Field awaiter;
- PropertyExpr is_completed;
- MethodSpec on_completed;
- MethodSpec get_result;
+ AwaiterDefinition awaiter_definition;
TypeSpec type;
+ TypeSpec result_type;
public AwaitStatement (Expression expr, Location loc)
: base (expr, loc)
#region Properties
- public TypeSpec Type {
+ bool IsDynamic {
get {
- return type;
+ return awaiter_definition == null;
}
}
public TypeSpec ResultType {
get {
- return get_result.ReturnType;
+ return result_type;
}
}
GetResultExpression (ec).Emit (ec);
}
- public Invocation GetResultExpression (EmitContext ec)
+ public Expression GetResultExpression (EmitContext ec)
{
var fe_awaiter = new FieldExpr (awaiter, loc);
fe_awaiter.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, loc);
//
// result = awaiter.GetResult ();
//
- var mg_result = MethodGroupExpr.CreatePredefined (get_result, fe_awaiter.Type, loc);
+ if (IsDynamic) {
+ var rc = new ResolveContext (ec.MemberContext);
+ return new Invocation (new MemberAccess (fe_awaiter, "GetResult"), new Arguments (0)).Resolve (rc);
+ }
+
+ var mg_result = MethodGroupExpr.CreatePredefined (awaiter_definition.GetResult, fe_awaiter.Type, loc);
mg_result.InstanceExpression = fe_awaiter;
return new GetResultInvocation (mg_result, new Arguments (0));
public void EmitPrologue (EmitContext ec)
{
+ awaiter = ((AsyncTaskStorey) machine_initializer.Storey).AddAwaiter (expr.Type, loc);
+
var fe_awaiter = new FieldExpr (awaiter, loc);
fe_awaiter.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, loc);
//
// awaiter = expr.GetAwaiter ();
//
- fe_awaiter.EmitAssign (ec, expr, false, false);
+ using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
+ fe_awaiter.EmitAssign (ec, expr, false, false);
+ }
Label skip_continuation = ec.DefineLabel ();
- is_completed.InstanceExpression = fe_awaiter;
- is_completed.EmitBranchable (ec, skip_continuation, true);
+ Expression completed_expr;
+ if (IsDynamic) {
+ var rc = new ResolveContext (ec.MemberContext);
- base.DoEmit (ec);
+ Arguments dargs = new Arguments (1);
+ dargs.Add (new Argument (fe_awaiter));
+ completed_expr = new DynamicMemberBinder ("IsCompleted", dargs, loc).Resolve (rc);
+
+ dargs = new Arguments (1);
+ dargs.Add (new Argument (completed_expr));
+ completed_expr = new DynamicConversion (ec.Module.Compiler.BuiltinTypes.Bool, 0, dargs, loc).Resolve (rc);
+ } else {
+ var pe = PropertyExpr.CreatePredefined (awaiter_definition.IsCompleted, loc);
+ pe.InstanceExpression = fe_awaiter;
+ completed_expr = pe;
+ }
+
+ completed_expr.EmitBranchable (ec, skip_continuation, true);
- FieldSpec[] stack_fields = null;
- TypeSpec[] stack = null;
+ base.DoEmit (ec);
//
// The stack has to be empty before calling await continuation. We handle this
//
ec.AssertEmptyStack ();
- var mg_completed = MethodGroupExpr.CreatePredefined (on_completed, fe_awaiter.Type, loc);
- mg_completed.InstanceExpression = fe_awaiter;
-
- var args = new Arguments (1);
var storey = (AsyncTaskStorey) machine_initializer.Storey;
- var fe_cont = new FieldExpr (storey.Continuation, loc);
- fe_cont.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, loc);
-
- args.Add (new Argument (fe_cont));
-
- //
- // awaiter.OnCompleted (continuation);
- //
- mg_completed.EmitCall (ec, args);
+ if (IsDynamic) {
+ storey.EmitAwaitOnCompletedDynamic (ec, fe_awaiter);
+ } else {
+ storey.EmitAwaitOnCompleted (ec, fe_awaiter);
+ }
// Return ok
machine_initializer.EmitLeave (ec, unwind_protect);
ec.MarkLabel (resume_point);
-
- if (stack_fields != null) {
- for (int i = 0; i < stack_fields.Length; ++i) {
- ec.EmitThis ();
-
- var field = stack_fields[i];
-
- //
- // We don't store `this' because it can be easily re-created
- //
- if (field == null)
- continue;
-
- if (stack[i] is ReferenceContainer)
- ec.Emit (OpCodes.Ldflda, field);
- else
- ec.Emit (OpCodes.Ldfld, field);
- }
- }
-
ec.MarkLabel (skip_continuation);
}
public void EmitStatement (EmitContext ec)
{
EmitPrologue (ec);
- Emit (ec);
+ DoEmit (ec);
- if (ResultType.Kind != MemberKind.Void) {
- var storey = (AsyncTaskStorey) machine_initializer.Storey;
+ awaiter.IsAvailableForReuse = true;
- if (storey.HoistedReturn != null)
- storey.HoistedReturn.EmitAssign (ec);
- else
- ec.Emit (OpCodes.Pop);
- }
- }
-
- static void Error_WrongGetAwaiter (ResolveContext rc, Location loc, TypeSpec type)
- {
- rc.Report.Error (1986, loc,
- "The `await' operand type `{0}' must have suitable GetAwaiter method",
- type.GetSignatureForError ());
+ if (ResultType.Kind != MemberKind.Void)
+ ec.Emit (OpCodes.Pop);
}
void Error_WrongAwaiterPattern (ResolveContext rc, TypeSpec awaiter)
{
- rc.Report.Error (1999, loc, "The awaiter type `{0}' must have suitable IsCompleted, OnCompleted, and GetResult members",
+ rc.Report.Error (4011, loc, "The awaiter type `{0}' must have suitable IsCompleted and GetResult members",
awaiter.GetSignatureForError ());
}
public override bool Resolve (BlockContext bc)
{
+ if (bc.CurrentBlock is Linq.QueryBlock) {
+ bc.Report.Error (1995, loc,
+ "The `await' operator may only be used in a query expression within the first collection expression of the initial `from' clause or within the collection expression of a `join' clause");
+ return false;
+ }
+
if (!base.Resolve (bc))
return false;
type = expr.Type;
+ Arguments args = new Arguments (0);
//
- // The task result is of dynamic type
+ // The await expression is of dynamic type
//
- if (expr.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
- throw new NotImplementedException ("dynamic await");
+ if (type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
+ result_type = type;
+ expr = new Invocation (new MemberAccess (expr, "GetAwaiter"), args).Resolve (bc);
+ return true;
+ }
//
// Check whether the expression is awaitable
if (ama == null)
return false;
- Arguments args = new Arguments (0);
-
var errors_printer = new SessionReportPrinter ();
var old = bc.Report.SetPrinter (errors_printer);
ama = new Invocation (ama, args).Resolve (bc);
+ bc.Report.SetPrinter (old);
if (errors_printer.ErrorsCount > 0 || !MemberAccess.IsValidDotExpression (ama.Type)) {
- bc.Report.SetPrinter (old);
- Error_WrongGetAwaiter (bc, loc, expr.Type);
+ bc.Report.Error (1986, expr.Location,
+ "The `await' operand type `{0}' must have suitable GetAwaiter method",
+ expr.Type.GetSignatureForError ());
+
return false;
}
var awaiter_type = ama.Type;
- awaiter = ((AsyncTaskStorey) machine_initializer.Storey).AddAwaiter (awaiter_type, loc);
- expr = ama;
-
- //
- // Predefined: bool IsCompleted { get; }
- //
- var is_completed_ma = new MemberAccess (expr, "IsCompleted").Resolve (bc);
- if (is_completed_ma != null) {
- is_completed = is_completed_ma as PropertyExpr;
- if (is_completed != null && is_completed.Type.BuiltinType == BuiltinTypeSpec.Type.Bool && is_completed.IsInstance && is_completed.Getter != null) {
- // valid
- } else {
- bc.Report.SetPrinter (old);
- Error_WrongAwaiterPattern (bc, awaiter_type);
- return false;
- }
- }
- bc.Report.SetPrinter (old);
+ awaiter_definition = bc.Module.GetAwaiter (awaiter_type);
- if (errors_printer.ErrorsCount > 0) {
+ if (!awaiter_definition.IsValidPattern) {
Error_WrongAwaiterPattern (bc, awaiter_type);
return false;
}
- //
- // Predefined: OnCompleted (Action)
- //
- if (bc.Module.PredefinedTypes.Action.Define ()) {
- on_completed = MemberCache.FindMember (awaiter_type, MemberFilter.Method ("OnCompleted", 0,
- ParametersCompiled.CreateFullyResolved (bc.Module.PredefinedTypes.Action.TypeSpec), bc.Module.Compiler.BuiltinTypes.Void),
- BindingRestriction.InstanceOnly) as MethodSpec;
-
- if (on_completed == null) {
- Error_WrongAwaiterPattern (bc, awaiter_type);
- return false;
- }
- }
-
- //
- // Predefined: GetResult ()
- //
- // The method return type is also result type of await expression
- //
- get_result = MemberCache.FindMember (awaiter_type, MemberFilter.Method ("GetResult", 0,
- ParametersCompiled.EmptyReadOnlyParameters, null),
- BindingRestriction.InstanceOnly) as MethodSpec;
-
- if (get_result == null) {
- Error_WrongAwaiterPattern (bc, awaiter_type);
+ if (!awaiter_definition.INotifyCompletion) {
+ bc.Report.Error (4027, loc, "The awaiter type `{0}' must implement interface `{1}'",
+ awaiter_type.GetSignatureForError (), bc.Module.PredefinedTypes.INotifyCompletion.GetSignatureForError ());
return false;
}
+ expr = ama;
+ result_type = awaiter_definition.GetResult.ReturnType;
+
return true;
}
}
{
TypeInferenceContext return_inference;
- public AsyncInitializer (ParametersBlock block, TypeContainer host, TypeSpec returnType)
+ public AsyncInitializer (ParametersBlock block, TypeDefinition host, TypeSpec returnType)
: base (block, host, returnType)
{
}
}
}
- public override bool IsIterator {
- get {
- return false;
- }
+ public TypeSpec DelegateType {
+ get; set;
}
- public Block OriginalBlock {
+ public override bool IsIterator {
get {
- return block.Parent;
+ return false;
}
}
#endregion
- public static void Create (IMemberContext context, ParametersBlock block, ParametersCompiled parameters, TypeContainer host, TypeSpec returnType, Location loc)
- {
- if (returnType != null && returnType.Kind != MemberKind.Void &&
- returnType != host.Module.PredefinedTypes.Task.TypeSpec &&
- !returnType.IsGenericTask) {
- host.Compiler.Report.Error (1983, loc, "The return type of an async method must be void, Task, or Task<T>");
- }
-
- for (int i = 0; i < parameters.Count; i++) {
- Parameter p = parameters[i];
- Parameter.Modifier mod = p.ModFlags;
- if ((mod & Parameter.Modifier.ISBYREF) != 0) {
- host.Compiler.Report.Error (1988, p.Location,
- "Async methods cannot have ref or out parameters");
- return;
- }
-
- // TODO:
- if (p is ArglistParameter) {
- host.Compiler.Report.Error (1636, p.Location,
- "__arglist is not allowed in parameter list of iterators");
- return;
- }
-
- // TODO:
- if (parameters.Types[i].IsPointer) {
- host.Compiler.Report.Error (1637, p.Location,
- "Iterators cannot have unsafe parameters or yield types");
- return;
- }
- }
-
- // TODO: Warning
- //if (!block.HasAwait) {
- //}
-
- block.WrapIntoAsyncTask (context, host, returnType);
- }
-
protected override BlockContext CreateBlockContext (ResolveContext rc)
{
var ctx = base.CreateBlockContext (rc);
if (lambda != null)
return_inference = lambda.ReturnTypeInference;
+ ctx.StartFlowBranching (this, rc.CurrentBranching);
return ctx;
}
public override void EmitStatement (EmitContext ec)
{
var storey = (AsyncTaskStorey) Storey;
- storey.Instance.Emit (ec);
-
- var move_next_entry = storey.StateMachineMethod.Spec;
- if (storey.MemberName.Arity > 0) {
- move_next_entry = MemberCache.GetMember (storey.Instance.Type, move_next_entry);
- }
-
- ec.Emit (OpCodes.Call, move_next_entry);
-
- //
- // Emits return <async-storey-instance>.$builder.Task;
- //
- if (storey.Task != null) {
- var builder_field = storey.Builder.Spec;
- var task_get = storey.Task.Get;
-
- if (storey.MemberName.Arity > 0) {
- builder_field = MemberCache.GetMember (storey.Instance.Type, builder_field);
- task_get = MemberCache.GetMember (builder_field.MemberType, task_get);
- }
-
- var pe_task = new PropertyExpr (storey.Task, loc) {
- InstanceExpression = new FieldExpr (builder_field, loc) {
- InstanceExpression = storey.Instance
- },
- Getter = task_get
- };
-
- pe_task.Emit (ec);
- }
-
+ storey.EmitInitializer (ec);
ec.Emit (OpCodes.Ret);
}
}
class AsyncTaskStorey : StateMachine
{
- sealed class ParametersLoadStatement : Statement
- {
- readonly FieldSpec[] fields;
- readonly TypeSpec[] parametersTypes;
- readonly int thisParameterIndex;
-
- public ParametersLoadStatement (FieldSpec[] fields, TypeSpec[] parametersTypes, int thisParameterIndex)
- {
- this.fields = fields;
- this.parametersTypes = parametersTypes;
- this.thisParameterIndex = thisParameterIndex;
- }
-
- protected override void CloneTo (CloneContext clonectx, Statement target)
- {
- throw new NotImplementedException ();
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- for (int i = 0; i < fields.Length; ++i) {
- var field = fields[i];
- if (field == null)
- continue;
-
- ec.EmitArgumentLoad (thisParameterIndex);
- ec.EmitArgumentLoad (i);
- if (parametersTypes[i] is ReferenceContainer)
- ec.EmitLoadFromPtr (field.MemberType);
-
- ec.Emit (OpCodes.Stfld, field);
- }
- }
- }
-
int awaiters;
- Field builder, continuation;
+ Field builder;
readonly TypeSpec return_type;
MethodSpec set_result;
MethodSpec set_exception;
+ MethodSpec builder_factory;
+ MethodSpec builder_start;
PropertySpec task;
LocalVariable hoisted_return;
int locals_captured;
+ Dictionary<TypeSpec, List<Field>> stack_fields;
+ Dictionary<TypeSpec, List<Field>> awaiter_fields;
- public AsyncTaskStorey (IMemberContext context, AsyncInitializer initializer, TypeSpec type)
- : base (initializer.OriginalBlock, initializer.Host,context.CurrentMemberDefinition as MemberBase, context.CurrentTypeParameters, "async")
+ public AsyncTaskStorey (ParametersBlock block, IMemberContext context, AsyncInitializer initializer, TypeSpec type)
+ : base (block, initializer.Host, context.CurrentMemberDefinition as MemberBase, context.CurrentTypeParameters, "async", MemberKind.Struct)
{
return_type = type;
+ awaiter_fields = new Dictionary<TypeSpec, List<Field>> ();
}
#region Properties
- public Field Builder {
- get {
- return builder;
- }
- }
-
- public Field Continuation {
- get {
- return continuation;
- }
- }
-
public LocalVariable HoistedReturn {
get {
return hoisted_return;
}
}
+ protected override TypeAttributes TypeAttr {
+ get {
+ return base.TypeAttr & ~TypeAttributes.SequentialLayout;
+ }
+ }
+
#endregion
public Field AddAwaiter (TypeSpec type, Location loc)
{
- return AddCompilerGeneratedField ("$awaiter" + awaiters++.ToString ("X"), new TypeExpression (type, loc));
+ if (mutator != null)
+ type = mutator.Mutate (type);
+
+ List<Field> existing_fields = null;
+ if (awaiter_fields.TryGetValue (type, out existing_fields)) {
+ foreach (var f in existing_fields) {
+ if (f.IsAvailableForReuse) {
+ f.IsAvailableForReuse = false;
+ return f;
+ }
+ }
+ }
+
+ var field = AddCompilerGeneratedField ("$awaiter" + awaiters++.ToString ("X"), new TypeExpression (type, Location), true);
+ field.Define ();
+
+ if (existing_fields == null) {
+ existing_fields = new List<Field> ();
+ awaiter_fields.Add (type, existing_fields);
+ }
+
+ existing_fields.Add (field);
+ return field;
}
public Field AddCapturedLocalVariable (TypeSpec type)
if (mutator != null)
type = mutator.Mutate (type);
- var field = AddCompilerGeneratedField ("<s>$" + locals_captured++.ToString ("X"), new TypeExpression (type, Location));
+ List<Field> existing_fields = null;
+ if (stack_fields == null) {
+ stack_fields = new Dictionary<TypeSpec, List<Field>> ();
+ } else if (stack_fields.TryGetValue (type, out existing_fields)) {
+ foreach (var f in existing_fields) {
+ if (f.IsAvailableForReuse) {
+ f.IsAvailableForReuse = false;
+ return f;
+ }
+ }
+ }
+
+ var field = AddCompilerGeneratedField ("$stack" + locals_captured++.ToString ("X"), new TypeExpression (type, Location), true);
field.Define ();
+ if (existing_fields == null) {
+ existing_fields = new List<Field> ();
+ stack_fields.Add (type, existing_fields);
+ }
+
+ existing_fields.Add (field);
+
return field;
}
protected override bool DoDefineMembers ()
{
- var action = Module.PredefinedTypes.Action.Resolve ();
- if (action != null) {
- continuation = AddCompilerGeneratedField ("$continuation", new TypeExpression (action, Location));
- continuation.ModFlags |= Modifiers.READONLY;
- }
-
PredefinedType builder_type;
PredefinedMember<MethodSpec> bf;
+ PredefinedMember<MethodSpec> bs;
PredefinedMember<MethodSpec> sr;
PredefinedMember<MethodSpec> se;
+ PredefinedMember<MethodSpec> sm;
bool has_task_return_type = false;
var pred_members = Module.PredefinedMembers;
if (return_type.Kind == MemberKind.Void) {
builder_type = Module.PredefinedTypes.AsyncVoidMethodBuilder;
bf = pred_members.AsyncVoidMethodBuilderCreate;
+ bs = pred_members.AsyncVoidMethodBuilderStart;
sr = pred_members.AsyncVoidMethodBuilderSetResult;
se = pred_members.AsyncVoidMethodBuilderSetException;
+ sm = pred_members.AsyncVoidMethodBuilderSetStateMachine;
} else if (return_type == Module.PredefinedTypes.Task.TypeSpec) {
builder_type = Module.PredefinedTypes.AsyncTaskMethodBuilder;
bf = pred_members.AsyncTaskMethodBuilderCreate;
+ bs = pred_members.AsyncTaskMethodBuilderStart;
sr = pred_members.AsyncTaskMethodBuilderSetResult;
se = pred_members.AsyncTaskMethodBuilderSetException;
- task = pred_members.AsyncTaskMethodBuilderTask.Resolve (Location);
+ sm = pred_members.AsyncTaskMethodBuilderSetStateMachine;
+ task = pred_members.AsyncTaskMethodBuilderTask.Get ();
} else {
builder_type = Module.PredefinedTypes.AsyncTaskMethodBuilderGeneric;
bf = pred_members.AsyncTaskMethodBuilderGenericCreate;
+ bs = pred_members.AsyncTaskMethodBuilderGenericStart;
sr = pred_members.AsyncTaskMethodBuilderGenericSetResult;
se = pred_members.AsyncTaskMethodBuilderGenericSetException;
- task = pred_members.AsyncTaskMethodBuilderGenericTask.Resolve (Location);
+ sm = pred_members.AsyncTaskMethodBuilderGenericSetStateMachine;
+ task = pred_members.AsyncTaskMethodBuilderGenericTask.Get ();
has_task_return_type = true;
}
- set_result = sr.Resolve (Location);
- set_exception = se.Resolve (Location);
- var builder_factory = bf.Resolve (Location);
- var bt = builder_type.Resolve ();
- if (bt == null || set_result == null || builder_factory == null || set_exception == null)
- return false;
+ set_result = sr.Get ();
+ set_exception = se.Get ();
+ builder_factory = bf.Get ();
+ builder_start = bs.Get ();
+
+ var istate_machine = Module.PredefinedTypes.IAsyncStateMachine;
+ var set_statemachine = sm.Get ();
+
+ if (!builder_type.Define () || !istate_machine.Define () || set_result == null || builder_factory == null ||
+ set_exception == null || set_statemachine == null || builder_start == null ||
+ !Module.PredefinedTypes.INotifyCompletion.Define ()) {
+ Report.Error (1993, Location,
+ "Cannot find compiler required types for asynchronous functions support. Are you targeting the wrong framework version?");
+ return base.DoDefineMembers ();
+ }
+
+ var bt = builder_type.TypeSpec;
//
// Inflate generic Task types
task_return_type = mutator.Mutate (task_return_type);
bt = bt.MakeGenericType (Module, task_return_type);
- builder_factory = MemberCache.GetMember<MethodSpec> (bt, builder_factory);
- set_result = MemberCache.GetMember<MethodSpec> (bt, set_result);
- set_exception = MemberCache.GetMember<MethodSpec> (bt, set_exception);
+ set_result = MemberCache.GetMember (bt, set_result);
+ set_exception = MemberCache.GetMember (bt, set_exception);
+ set_statemachine = MemberCache.GetMember (bt, set_statemachine);
if (task != null)
- task = MemberCache.GetMember<PropertySpec> (bt, task);
+ task = MemberCache.GetMember (bt, task);
}
builder = AddCompilerGeneratedField ("$builder", new TypeExpression (bt, Location));
- builder.ModFlags |= Modifiers.READONLY;
+
+ var set_state_machine = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Void, Location),
+ Modifiers.COMPILER_GENERATED | Modifiers.DEBUGGER_HIDDEN | Modifiers.PUBLIC,
+ new MemberName ("SetStateMachine"),
+ ParametersCompiled.CreateFullyResolved (
+ new Parameter (new TypeExpression (istate_machine.TypeSpec, Location), "stateMachine", Parameter.Modifier.NONE, null, Location),
+ istate_machine.TypeSpec),
+ null);
+
+ ToplevelBlock block = new ToplevelBlock (Compiler, set_state_machine.ParameterInfo, Location);
+ block.IsCompilerGenerated = true;
+ set_state_machine.Block = block;
+
+ Members.Add (set_state_machine);
if (!base.DoDefineMembers ())
return false;
- MethodGroupExpr mg;
- var block = instance_constructors[0].Block;
-
//
- // Initialize continuation with state machine method
+ // Fabricates SetStateMachine method
+ //
+ // public void SetStateMachine (IAsyncStateMachine stateMachine)
+ // {
+ // $builder.SetStateMachine (stateMachine);
+ // }
//
- if (continuation != null) {
- var args = new Arguments (1);
- mg = MethodGroupExpr.CreatePredefined (StateMachineMethod.Spec, spec, Location);
- args.Add (new Argument (mg));
+ var mg = MethodGroupExpr.CreatePredefined (set_statemachine, bt, Location);
+ mg.InstanceExpression = new FieldExpr (builder, Location);
- block.AddStatement (
- new StatementExpression (new SimpleAssign (
- new FieldExpr (continuation, Location),
- new NewDelegate (action, args, Location),
- Location
- )));
- }
+ var param_reference = block.GetParameterReference (0, Location);
+ param_reference.Type = istate_machine.TypeSpec;
+ param_reference.eclass = ExprClass.Variable;
- mg = MethodGroupExpr.CreatePredefined (builder_factory, bt, Location);
- block.AddStatement (
- new StatementExpression (new SimpleAssign (
- new FieldExpr (builder, Location),
- new Invocation (mg, new Arguments (0)),
- Location)));
+ var args = new Arguments (1);
+ args.Add (new Argument (param_reference));
+ set_state_machine.Block.AddStatement (new StatementExpression (new Invocation (mg, args)));
if (has_task_return_type) {
- hoisted_return = LocalVariable.CreateCompilerGenerated (bt.TypeArguments[0], block, Location);
+ hoisted_return = LocalVariable.CreateCompilerGenerated (bt.TypeArguments[0], StateMachineMethod.Block, Location);
}
return true;
}
+ public void EmitAwaitOnCompletedDynamic (EmitContext ec, FieldExpr awaiter)
+ {
+ var critical = Module.PredefinedTypes.ICriticalNotifyCompletion;
+ if (!critical.Define ()) {
+ throw new NotImplementedException ();
+ }
+
+ var temp_critical = new LocalTemporary (critical.TypeSpec);
+ var label_critical = ec.DefineLabel ();
+ var label_end = ec.DefineLabel ();
+
+ //
+ // Special path for dynamic awaiters
+ //
+ // var awaiter = this.$awaiter as ICriticalNotifyCompletion;
+ // if (awaiter == null) {
+ // var completion = (INotifyCompletion) this.$awaiter;
+ // this.$builder.AwaitOnCompleted (ref completion, ref this);
+ // } else {
+ // this.$builder.AwaitUnsafeOnCompleted (ref awaiter, ref this);
+ // }
+ //
+ awaiter.Emit (ec);
+ ec.Emit (OpCodes.Isinst, critical.TypeSpec);
+ temp_critical.Store (ec);
+ temp_critical.Emit (ec);
+ ec.Emit (OpCodes.Brtrue_S, label_critical);
+
+ var temp = new LocalTemporary (Module.PredefinedTypes.INotifyCompletion.TypeSpec);
+ awaiter.Emit (ec);
+ ec.Emit (OpCodes.Castclass, temp.Type);
+ temp.Store (ec);
+ EmitOnCompleted (ec, temp, false);
+ temp.Release (ec);
+ ec.Emit (OpCodes.Br_S, label_end);
+
+ ec.MarkLabel (label_critical);
+
+ EmitOnCompleted (ec, temp_critical, true);
+
+ ec.MarkLabel (label_end);
+
+ temp_critical.Release (ec);
+ }
+
+ public void EmitAwaitOnCompleted (EmitContext ec, FieldExpr awaiter)
+ {
+ bool unsafe_version = false;
+ if (Module.PredefinedTypes.ICriticalNotifyCompletion.Define ()) {
+ unsafe_version = awaiter.Type.ImplementsInterface (Module.PredefinedTypes.ICriticalNotifyCompletion.TypeSpec, false);
+ }
+
+ EmitOnCompleted (ec, awaiter, unsafe_version);
+ }
+
+ void EmitOnCompleted (EmitContext ec, Expression awaiter, bool unsafeVersion)
+ {
+ var pm = Module.PredefinedMembers;
+ PredefinedMember<MethodSpec> predefined;
+ bool has_task_return_type = false;
+ if (return_type.Kind == MemberKind.Void) {
+ predefined = unsafeVersion ? pm.AsyncVoidMethodBuilderOnCompletedUnsafe : pm.AsyncVoidMethodBuilderOnCompleted;
+ } else if (return_type == Module.PredefinedTypes.Task.TypeSpec) {
+ predefined = unsafeVersion ? pm.AsyncTaskMethodBuilderOnCompletedUnsafe : pm.AsyncTaskMethodBuilderOnCompleted;
+ } else {
+ predefined = unsafeVersion ? pm.AsyncTaskMethodBuilderGenericOnCompletedUnsafe : pm.AsyncTaskMethodBuilderGenericOnCompleted;
+ has_task_return_type = true;
+ }
+
+ var on_completed = predefined.Resolve (Location);
+ if (on_completed == null)
+ return;
+
+ if (has_task_return_type)
+ on_completed = MemberCache.GetMember<MethodSpec> (set_result.DeclaringType, on_completed);
+
+ on_completed = on_completed.MakeGenericMethod (this, awaiter.Type, ec.CurrentType);
+
+ var mg = MethodGroupExpr.CreatePredefined (on_completed, on_completed.DeclaringType, Location);
+ mg.InstanceExpression = new FieldExpr (builder, Location) {
+ InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location)
+ };
+
+ var args = new Arguments (2);
+ args.Add (new Argument (awaiter, Argument.AType.Ref));
+ args.Add (new Argument (new CompilerGeneratedThis (CurrentType, Location), Argument.AType.Ref));
+ mg.EmitCall (ec, args);
+ }
+
+ public void EmitInitializer (EmitContext ec)
+ {
+ //
+ // Some predefined types are missing
+ //
+ if (builder == null)
+ return;
+
+ var instance = (TemporaryVariableReference) Instance;
+ var builder_field = builder.Spec;
+ if (MemberName.Arity > 0) {
+ builder_field = MemberCache.GetMember (instance.Type, builder_field);
+ }
+
+ //
+ // Inflated factory method when task is of generic type
+ //
+ if (builder_factory.DeclaringType.IsGeneric) {
+ var task_return_type = return_type.TypeArguments;
+ var bt = builder_factory.DeclaringType.MakeGenericType (Module, task_return_type);
+ builder_factory = MemberCache.GetMember (bt, builder_factory);
+ builder_start = MemberCache.GetMember (bt, builder_start);
+ }
+
+ //
+ // stateMachine.$builder = AsyncTaskMethodBuilder<{task-type}>.Create();
+ //
+ instance.AddressOf (ec, AddressOp.Store);
+ ec.Emit (OpCodes.Call, builder_factory);
+ ec.Emit (OpCodes.Stfld, builder_field);
+
+ //
+ // stateMachine.$builder.Start<{storey-type}>(ref stateMachine);
+ //
+ instance.AddressOf (ec, AddressOp.Store);
+ ec.Emit (OpCodes.Ldflda, builder_field);
+ if (Task != null)
+ ec.Emit (OpCodes.Dup);
+ instance.AddressOf (ec, AddressOp.Store);
+ ec.Emit (OpCodes.Call, builder_start.MakeGenericMethod (Module, instance.Type));
+
+ //
+ // Emits return stateMachine.$builder.Task;
+ //
+ if (Task != null) {
+ var task_get = Task.Get;
+
+ if (MemberName.Arity > 0) {
+ task_get = MemberCache.GetMember (builder_field.MemberType, task_get);
+ }
+
+ var pe_task = new PropertyExpr (Task, Location) {
+ InstanceExpression = EmptyExpression.Null, // Comes from the dup above
+ Getter = task_get
+ };
+
+ pe_task.Emit (ec);
+ }
+ }
+
public void EmitSetException (EmitContext ec, LocalVariableReference exceptionVariable)
{
//
// $builder.SetException (Exception)
//
var mg = MethodGroupExpr.CreatePredefined (set_exception, set_exception.DeclaringType, Location);
- mg.InstanceExpression = new FieldExpr (Builder, Location) {
+ mg.InstanceExpression = new FieldExpr (builder, Location) {
InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location)
};
// $builder.SetResult<return-type> (value);
//
var mg = MethodGroupExpr.CreatePredefined (set_result, set_result.DeclaringType, Location);
- mg.InstanceExpression = new FieldExpr (Builder, Location) {
+ mg.InstanceExpression = new FieldExpr (builder, Location) {
InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location)
};
mg.EmitCall (ec, args);
}
+
+ protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
+ {
+ base_type = Compiler.BuiltinTypes.ValueType;
+ base_class = null;
+
+ var istate_machine = Module.PredefinedTypes.IAsyncStateMachine;
+ if (istate_machine.Define ()) {
+ return new[] { istate_machine.TypeSpec };
+ }
+
+ return null;
+ }
+ }
+
+ class StackFieldExpr : FieldExpr, IExpressionCleanup
+ {
+ public StackFieldExpr (Field field)
+ : base (field, Location.Null)
+ {
+ }
+
+ public override void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ base.AddressOf (ec, mode);
+
+ if (mode == AddressOp.Load) {
+ var field = (Field) spec.MemberDefinition;
+ field.IsAvailableForReuse = true;
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ base.Emit (ec);
+
+ var field = (Field) spec.MemberDefinition;
+ field.IsAvailableForReuse = true;
+
+ //
+ // Release any captured reference type stack variables
+ // to imitate real stack behavour and help GC stuff early
+ //
+ if (TypeSpec.IsReferenceType (type)) {
+ ec.AddStatementEpilog (this);
+ }
+ }
+
+ void IExpressionCleanup.EmitCleanup (EmitContext ec)
+ {
+ EmitAssign (ec, new NullConstant (type, loc), false, false);
+ }
}
}
projects / mono.git / blobdiff