// Dual licensed under the terms of the MIT X11 or GNU GPL
// Copyright 2003 Ximian, Inc.
// Copyright 2003-2008 Novell, Inc.
-//
-
-// TODO:
-// Flow analysis for Yield.
+// Copyright 2011 Xamarin Inc.
//
using System;
using System.Collections.Generic;
+using Mono.CompilerServices.SymbolWriter;
#if STATIC
using IKVM.Reflection.Emit;
using System.Reflection.Emit;
#endif
-namespace Mono.CSharp {
-
- public class Yield : ResumableStatement {
- Expression expr;
- bool unwind_protect;
- Iterator iterator;
+namespace Mono.CSharp
+{
+ public abstract class YieldStatement<T> : ResumableStatement where T : StateMachineInitializer
+ {
+ protected Expression expr;
+ protected bool unwind_protect;
+ protected T machine_initializer;
int resume_pc;
+ ExceptionStatement inside_try_block;
- public Yield (Expression expr, Location l)
+ protected YieldStatement (Expression expr, Location l)
{
this.expr = expr;
loc = l;
}
- public static bool CheckContext (ResolveContext ec, Location loc)
+ public Expression Expr {
+ get { return this.expr; }
+ }
+
+ protected override void CloneTo (CloneContext clonectx, Statement t)
+ {
+ var target = (YieldStatement<T>) t;
+ target.expr = expr.Clone (clonectx);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ machine_initializer.InjectYield (ec, expr, resume_pc, unwind_protect, resume_point);
+ }
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ expr.FlowAnalysis (fc);
+
+ RegisterResumePoint ();
+
+ return false;
+ }
+
+ public override bool Resolve (BlockContext bc)
+ {
+ expr = expr.Resolve (bc);
+ if (expr == null)
+ return false;
+
+ machine_initializer = bc.CurrentAnonymousMethod as T;
+ inside_try_block = bc.CurrentTryBlock;
+ return true;
+ }
+
+ public void RegisterResumePoint ()
+ {
+ if (inside_try_block == null) {
+ resume_pc = machine_initializer.AddResumePoint (this);
+ } else {
+ resume_pc = inside_try_block.AddResumePoint (this, resume_pc, machine_initializer);
+ unwind_protect = true;
+ inside_try_block = null;
+ }
+ }
+ }
+
+ public class Yield : YieldStatement<Iterator>
+ {
+ public Yield (Expression expr, Location loc)
+ : base (expr, loc)
+ {
+ }
+
+ public static bool CheckContext (BlockContext bc, Location loc)
{
- if (!ec.CurrentAnonymousMethod.IsIterator) {
- ec.Report.Error (1621, loc,
- "The yield statement cannot be used inside " +
- "anonymous method blocks");
+ if (!bc.CurrentAnonymousMethod.IsIterator) {
+ bc.Report.Error (1621, loc,
+ "The yield statement cannot be used inside anonymous method blocks");
+ return false;
+ }
+
+ if (bc.HasSet (ResolveContext.Options.FinallyScope)) {
+ bc.Report.Error (1625, loc, "Cannot yield in the body of a finally clause");
return false;
}
return true;
}
- public override bool Resolve (BlockContext ec)
+ public override bool Resolve (BlockContext bc)
{
- expr = expr.Resolve (ec);
- if (expr == null)
+ if (!CheckContext (bc, loc))
return false;
- if (!CheckContext (ec, loc))
+ if (bc.HasAny (ResolveContext.Options.TryWithCatchScope)) {
+ bc.Report.Error (1626, loc, "Cannot yield a value in the body of a try block with a catch clause");
+ }
+
+ if (bc.HasSet (ResolveContext.Options.CatchScope)) {
+ bc.Report.Error (1631, loc, "Cannot yield a value in the body of a catch clause");
+ }
+
+ if (!base.Resolve (bc))
return false;
- iterator = ec.CurrentIterator;
- if (expr.Type != iterator.OriginalIteratorType) {
- expr = Convert.ImplicitConversionRequired (
- ec, expr, iterator.OriginalIteratorType, loc);
+ var otype = bc.CurrentIterator.OriginalIteratorType;
+ if (expr.Type != otype) {
+ expr = Convert.ImplicitConversionRequired (bc, expr, otype, loc);
if (expr == null)
return false;
}
- if (!ec.CurrentBranching.CurrentUsageVector.IsUnreachable)
- unwind_protect = ec.CurrentBranching.AddResumePoint (this, loc, out resume_pc);
-
return true;
}
-
- protected override void DoEmit (EmitContext ec)
- {
- iterator.MarkYield (ec, expr, resume_pc, unwind_protect, resume_point);
- }
-
- protected override void CloneTo (CloneContext clonectx, Statement t)
+
+ public override object Accept (StructuralVisitor visitor)
{
- Yield target = (Yield) t;
-
- target.expr = expr.Clone (clonectx);
+ return visitor.Visit (this);
}
}
loc = l;
}
- public override void Error_FinallyClause (Report Report)
- {
- Report.Error (1625, loc, "Cannot yield in the body of a finally clause");
+ protected override bool IsLocalExit {
+ get {
+ return false;
+ }
}
protected override void CloneTo (CloneContext clonectx, Statement target)
throw new NotSupportedException ();
}
- protected override bool DoResolve (BlockContext ec)
+ protected override bool DoResolve (BlockContext bc)
{
- iterator = ec.CurrentIterator;
- return Yield.CheckContext (ec, loc);
+ iterator = bc.CurrentIterator;
+ return Yield.CheckContext (bc, loc);
}
protected override void DoEmit (EmitContext ec)
{
iterator.EmitYieldBreak (ec, unwind_protect);
}
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ return true;
+ }
+
+ public override Reachability MarkReachable (Reachability rc)
+ {
+ base.MarkReachable (rc);
+ return Reachability.CreateUnreachable ();
+ }
+
+ public override object Accept (StructuralVisitor visitor)
+ {
+ return visitor.Visit (this);
+ }
}
- public class IteratorStorey : AnonymousMethodStorey
+ public abstract class StateMachine : AnonymousMethodStorey
{
- class GetEnumeratorMethod : IteratorMethod
+ public enum State
+ {
+ Running = -3, // Used only in CurrentPC, never stored into $PC
+ Uninitialized = -2,
+ After = -1,
+ Start = 0
+ }
+
+ Field pc_field;
+ StateMachineMethod method;
+ int local_name_idx;
+
+ protected StateMachine (ParametersBlock block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name, MemberKind kind)
+ : base (block, parent, host, tparams, name, kind)
+ {
+ }
+
+ #region Properties
+
+ public StateMachineMethod StateMachineMethod {
+ get {
+ return method;
+ }
+ }
+
+ public Field PC {
+ get {
+ return pc_field;
+ }
+ }
+
+ #endregion
+
+ public void AddEntryMethod (StateMachineMethod method)
+ {
+ if (this.method != null)
+ throw new InternalErrorException ();
+
+ this.method = method;
+ Members.Add (method);
+ }
+
+ protected override bool DoDefineMembers ()
+ {
+ pc_field = AddCompilerGeneratedField ("$PC", new TypeExpression (Compiler.BuiltinTypes.Int, Location));
+
+ return base.DoDefineMembers ();
+ }
+
+ protected override string GetVariableMangledName (LocalVariable local_info)
+ {
+ if (local_info.IsCompilerGenerated)
+ return base.GetVariableMangledName (local_info);
+
+ return "<" + local_info.Name + ">__" + local_name_idx++.ToString ("X");
+ }
+ }
+
+ class IteratorStorey : StateMachine
+ {
+ class GetEnumeratorMethod : StateMachineMethod
{
sealed class GetEnumeratorStatement : Statement
{
- IteratorStorey host;
- IteratorMethod host_method;
+ readonly IteratorStorey host;
+ readonly StateMachineMethod host_method;
Expression new_storey;
- public GetEnumeratorStatement (IteratorStorey host, IteratorMethod host_method)
+ public GetEnumeratorStatement (IteratorStorey host, StateMachineMethod host_method)
{
this.host = host;
this.host_method = host_method;
init = new List<Expression> (host.HoistedParameters.Count);
for (int i = 0; i < host.hoisted_params.Count; ++i) {
- HoistedParameter hp = (HoistedParameter) host.hoisted_params [i];
- HoistedParameter hp_cp = (HoistedParameter) host.hoisted_params_copy [i];
+ HoistedParameter hp = host.hoisted_params [i];
+ HoistedParameter hp_cp = host.hoisted_params_copy [i] ?? hp;
FieldExpr from = new FieldExpr (hp_cp.Field, loc);
from.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, loc);
if (new_storey != null)
new_storey = Convert.ImplicitConversionRequired (ec, new_storey, host_method.MemberType, loc);
- ec.CurrentBranching.CurrentUsageVector.Goto ();
return true;
}
{
Label label_init = ec.DefineLabel ();
- ec.Emit (OpCodes.Ldarg_0);
+ ec.EmitThis ();
ec.Emit (OpCodes.Ldflda, host.PC.Spec);
- ec.EmitInt ((int) Iterator.State.Start);
- ec.EmitInt ((int) Iterator.State.Uninitialized);
+ ec.EmitInt ((int) State.Start);
+ ec.EmitInt ((int) State.Uninitialized);
var m = ec.Module.PredefinedMembers.InterlockedCompareExchange.Resolve (loc);
if (m != null)
ec.Emit (OpCodes.Call, m);
- ec.EmitInt ((int) Iterator.State.Uninitialized);
+ ec.EmitInt ((int) State.Uninitialized);
ec.Emit (OpCodes.Bne_Un_S, label_init);
- ec.Emit (OpCodes.Ldarg_0);
+ ec.EmitThis ();
ec.Emit (OpCodes.Ret);
ec.MarkLabel (label_init);
new_storey.Emit (ec);
ec.Emit (OpCodes.Ret);
}
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ throw new NotImplementedException ();
+ }
+
+ public override Reachability MarkReachable (Reachability rc)
+ {
+ base.MarkReachable (rc);
+ return Reachability.CreateUnreachable ();
+ }
+ }
+
+ GetEnumeratorMethod (IteratorStorey host, FullNamedExpression returnType, MemberName name)
+ : base (host, null, returnType, Modifiers.DEBUGGER_HIDDEN, name, ToplevelBlock.Flags.CompilerGenerated | ToplevelBlock.Flags.NoFlowAnalysis)
+ {
+ }
+
+ public static GetEnumeratorMethod Create (IteratorStorey host, FullNamedExpression returnType, MemberName name)
+ {
+ return Create (host, returnType, name, null);
}
- public GetEnumeratorMethod (IteratorStorey host, FullNamedExpression returnType, MemberName name)
- : base (host, returnType, Modifiers.DEBUGGER_HIDDEN, name)
+ public static GetEnumeratorMethod Create (IteratorStorey host, FullNamedExpression returnType, MemberName name, Statement statement)
{
- Block.AddStatement (new GetEnumeratorStatement (host, this));
+ var m = new GetEnumeratorMethod (host, returnType, name);
+ var stmt = statement ?? new GetEnumeratorStatement (host, m);
+ m.block.AddStatement (stmt);
+ return m;
}
}
- class DisposeMethod : IteratorMethod
+ class DisposeMethod : StateMachineMethod
{
sealed class DisposeMethodStatement : Statement
{
protected override void DoEmit (EmitContext ec)
{
+ ec.CurrentAnonymousMethod = iterator;
iterator.EmitDispose (ec);
}
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ throw new NotImplementedException ();
+ }
}
public DisposeMethod (IteratorStorey host)
- : base (host, new TypeExpression (host.Compiler.BuiltinTypes.Void, host.Location), Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
- new MemberName ("Dispose", host.Location))
+ : base (host, null, new TypeExpression (host.Compiler.BuiltinTypes.Void, host.Location), Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
+ new MemberName ("Dispose", host.Location), ToplevelBlock.Flags.CompilerGenerated | ToplevelBlock.Flags.NoFlowAnalysis)
{
- host.AddMethod (this);
+ host.Members.Add (this);
Block.AddStatement (new DisposeMethodStatement (host.Iterator));
}
public readonly Iterator Iterator;
+ List<HoistedParameter> hoisted_params_copy;
+
TypeExpr iterator_type_expr;
- Field pc_field;
Field current_field;
Field disposing_field;
- TypeExpr enumerator_type;
- TypeExpr enumerable_type;
- TypeArguments generic_args;
- TypeExpr generic_enumerator_type;
- TypeExpr generic_enumerable_type;
-
- List<HoistedParameter> hoisted_params_copy;
- int local_name_idx;
+ TypeSpec generic_enumerator_type;
+ TypeSpec generic_enumerable_type;
public IteratorStorey (Iterator iterator)
: base (iterator.Container.ParametersBlock, iterator.Host,
- iterator.OriginalMethod as MemberBase, iterator.GenericMethod == null ? null : iterator.GenericMethod.CurrentTypeParameters, "Iterator")
+ iterator.OriginalMethod as MemberBase, iterator.OriginalMethod.CurrentTypeParameters, "Iterator", MemberKind.Class)
{
this.Iterator = iterator;
}
- public Field PC {
+ public Field CurrentField {
get {
- return pc_field;
+ return current_field;
}
}
}
}
- public Field CurrentField {
- get { return current_field; }
- }
-
public IList<HoistedParameter> HoistedParameters {
get { return hoisted_params; }
}
+ protected override Constructor DefineDefaultConstructor (bool is_static)
+ {
+ var ctor = base.DefineDefaultConstructor (is_static);
+ ctor.ModFlags |= Modifiers.DEBUGGER_HIDDEN;
+ return ctor;
+ }
+
protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
{
var mtype = Iterator.OriginalIteratorType;
mtype = Mutator.Mutate (mtype);
iterator_type_expr = new TypeExpression (mtype, Location);
- generic_args = new TypeArguments (iterator_type_expr);
- var list = new List<FullNamedExpression> ();
+ var ifaces = new List<TypeSpec> (5);
if (Iterator.IsEnumerable) {
- enumerable_type = new TypeExpression (Compiler.BuiltinTypes.IEnumerable, Location);
- list.Add (enumerable_type);
+ ifaces.Add (Compiler.BuiltinTypes.IEnumerable);
if (Module.PredefinedTypes.IEnumerableGeneric.Define ()) {
- generic_enumerable_type = new GenericTypeExpr (Module.PredefinedTypes.IEnumerableGeneric.TypeSpec, generic_args, Location);
- list.Add (generic_enumerable_type);
+ generic_enumerable_type = Module.PredefinedTypes.IEnumerableGeneric.TypeSpec.MakeGenericType (Module, new[] { mtype });
+ ifaces.Add (generic_enumerable_type);
}
}
- enumerator_type = new TypeExpression (Compiler.BuiltinTypes.IEnumerator, Location);
- list.Add (enumerator_type);
-
- list.Add (new TypeExpression (Compiler.BuiltinTypes.IDisposable, Location));
+ ifaces.Add (Compiler.BuiltinTypes.IEnumerator);
+ ifaces.Add (Compiler.BuiltinTypes.IDisposable);
var ienumerator_generic = Module.PredefinedTypes.IEnumeratorGeneric;
if (ienumerator_generic.Define ()) {
- generic_enumerator_type = new GenericTypeExpr (ienumerator_generic.TypeSpec, generic_args, Location);
- list.Add (generic_enumerator_type);
+ generic_enumerator_type = ienumerator_generic.TypeSpec.MakeGenericType (Module, new [] { mtype });
+ ifaces.Add (generic_enumerator_type);
}
- type_bases = list;
-
- return base.ResolveBaseTypes (out base_class);
- }
+ base_class = null;
- protected override string GetVariableMangledName (LocalVariable local_info)
- {
- return "<" + local_info.Name + ">__" + local_name_idx++.ToString ();
+ base_type = Compiler.BuiltinTypes.Object;
+ return ifaces.ToArray ();
}
protected override bool DoDefineMembers ()
{
- DefineIteratorMembers ();
- return base.DoDefineMembers ();
- }
-
- void DefineIteratorMembers ()
- {
- pc_field = AddCompilerGeneratedField ("$PC", new TypeExpression (Compiler.BuiltinTypes.Int, Location));
current_field = AddCompilerGeneratedField ("$current", iterator_type_expr);
disposing_field = AddCompilerGeneratedField ("$disposing", new TypeExpression (Compiler.BuiltinTypes.Bool, Location));
- if (hoisted_params != null) {
+ if (Iterator.IsEnumerable && hoisted_params != null) {
//
// Iterators are independent, each GetEnumerator call has to
// create same enumerator therefore we have to keep original values
// around for re-initialization
//
- // TODO: Do it for assigned/modified parameters only
- //
hoisted_params_copy = new List<HoistedParameter> (hoisted_params.Count);
foreach (HoistedParameter hp in hoisted_params) {
- hoisted_params_copy.Add (new HoistedParameter (hp, "<$>" + hp.Field.Name));
+
+ //
+ // Don't create field copy for unmodified captured parameters
+ //
+ HoistedParameter hp_copy;
+ if (hp.IsAssigned) {
+ hp_copy = new HoistedParameter (hp, "<$>" + hp.Field.Name);
+ } else {
+ hp_copy = null;
+ }
+
+ hoisted_params_copy.Add (hp_copy);
}
}
Define_Reset ();
if (Iterator.IsEnumerable) {
- MemberName name = new MemberName (QualifiedAliasMember.GlobalAlias, "System", null, Location);
- name = new MemberName (name, "Collections", Location);
- name = new MemberName (name, "IEnumerable", Location);
- name = new MemberName (name, "GetEnumerator", Location);
+ FullNamedExpression explicit_iface = new TypeExpression (Compiler.BuiltinTypes.IEnumerable, Location);
+ var name = new MemberName ("GetEnumerator", null, explicit_iface, Location.Null);
if (generic_enumerator_type != null) {
- Method get_enumerator = new IteratorMethod (this, enumerator_type, 0, name);
-
- name = new MemberName (name.Left.Left, "Generic", Location);
- name = new MemberName (name, "IEnumerable", generic_args, Location);
- name = new MemberName (name, "GetEnumerator", Location);
- Method gget_enumerator = new GetEnumeratorMethod (this, generic_enumerator_type, name);
+ explicit_iface = new TypeExpression (generic_enumerable_type, Location);
+ var gname = new MemberName ("GetEnumerator", null, explicit_iface, Location.Null);
+ Method gget_enumerator = GetEnumeratorMethod.Create (this, new TypeExpression (generic_enumerator_type, Location), gname);
//
// Just call generic GetEnumerator implementation
//
- get_enumerator.Block.AddStatement (
- new Return (new Invocation (new DynamicMethodGroupExpr (gget_enumerator, Location), null), Location));
+ var stmt = new Return (new Invocation (new DynamicMethodGroupExpr (gget_enumerator, Location), null), Location);
+ Method get_enumerator = GetEnumeratorMethod.Create (this, new TypeExpression (Compiler.BuiltinTypes.IEnumerator, Location), name, stmt);
- AddMethod (get_enumerator);
- AddMethod (gget_enumerator);
+ Members.Add (get_enumerator);
+ Members.Add (gget_enumerator);
} else {
- AddMethod (new GetEnumeratorMethod (this, enumerator_type, name));
+ Members.Add (GetEnumeratorMethod.Create (this, new TypeExpression (Compiler.BuiltinTypes.IEnumerator, Location), name));
}
}
- }
- protected override void EmitHoistedParameters (EmitContext ec, IList<HoistedParameter> hoisted)
- {
- base.EmitHoistedParameters (ec, hoisted);
- base.EmitHoistedParameters (ec, hoisted_params_copy);
+ return base.DoDefineMembers ();
}
void Define_Current (bool is_generic)
{
TypeExpr type;
-
- MemberName name = new MemberName (QualifiedAliasMember.GlobalAlias, "System", null, Location);
- name = new MemberName (name, "Collections", Location);
+ FullNamedExpression explicit_iface;
if (is_generic) {
- name = new MemberName (name, "Generic", Location);
- name = new MemberName (name, "IEnumerator", generic_args, Location);
+ explicit_iface = new TypeExpression (generic_enumerator_type, Location);
type = iterator_type_expr;
} else {
- name = new MemberName (name, "IEnumerator");
+ explicit_iface = new TypeExpression (Module.Compiler.BuiltinTypes.IEnumerator, Location);
type = new TypeExpression (Compiler.BuiltinTypes.Object, Location);
}
- name = new MemberName (name, "Current", Location);
+ var name = new MemberName ("Current", null, explicit_iface, Location);
- ToplevelBlock get_block = new ToplevelBlock (Compiler, Location);
+ ToplevelBlock get_block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location,
+ Block.Flags.CompilerGenerated | Block.Flags.NoFlowAnalysis);
get_block.AddStatement (new Return (new DynamicFieldExpr (CurrentField, Location), Location));
- Property current = new Property (this, type, Modifiers.DEBUGGER_HIDDEN, name, null);
- current.Get = new Property.GetMethod (current, 0, null, Location);
+ Property current = new Property (this, type, Modifiers.DEBUGGER_HIDDEN | Modifiers.COMPILER_GENERATED, name, null);
+ current.Get = new Property.GetMethod (current, Modifiers.COMPILER_GENERATED, null, Location);
current.Get.Block = get_block;
- AddProperty (current);
+ Members.Add (current);
}
void Define_Reset ()
{
Method reset = new Method (
- this, null, new TypeExpression (Compiler.BuiltinTypes.Void, Location),
- Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
+ this, new TypeExpression (Compiler.BuiltinTypes.Void, Location),
+ Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN | Modifiers.COMPILER_GENERATED,
new MemberName ("Reset", Location),
ParametersCompiled.EmptyReadOnlyParameters, null);
- AddMethod (reset);
+ Members.Add (reset);
- reset.Block = new ToplevelBlock (Compiler, Location);
+ reset.Block = new ToplevelBlock (Compiler, reset.ParameterInfo, Location,
+ Block.Flags.CompilerGenerated | Block.Flags.NoFlowAnalysis);
TypeSpec ex_type = Module.PredefinedTypes.NotSupportedException.Resolve ();
if (ex_type == null)
reset.Block.AddStatement (new Throw (new New (new TypeExpression (ex_type, Location), null, Location), Location));
}
+
+ protected override void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
+ {
+ base.EmitHoistedParameters (ec, hoisted);
+ if (hoisted_params_copy != null)
+ base.EmitHoistedParameters (ec, hoisted_params_copy);
+ }
}
- class IteratorMethod : Method
+ public class StateMachineMethod : Method
{
- readonly IteratorStorey host;
+ readonly StateMachineInitializer expr;
- public IteratorMethod (IteratorStorey host, FullNamedExpression returnType, Modifiers mod, MemberName name)
- : base (host, null, returnType, mod | Modifiers.COMPILER_GENERATED,
+ public StateMachineMethod (StateMachine host, StateMachineInitializer expr, FullNamedExpression returnType,
+ Modifiers mod, MemberName name, ToplevelBlock.Flags blockFlags)
+ : base (host, returnType, mod | Modifiers.COMPILER_GENERATED,
name, ParametersCompiled.EmptyReadOnlyParameters, null)
{
- this.host = host;
-
- Block = new ToplevelBlock (host.Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location);
+ this.expr = expr;
+ Block = new ToplevelBlock (host.Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null, blockFlags);
}
- public override EmitContext CreateEmitContext (ILGenerator ig)
+ public override EmitContext CreateEmitContext (ILGenerator ig, SourceMethodBuilder sourceMethod)
{
- EmitContext ec = new EmitContext (this, ig, MemberType);
+ EmitContext ec = new EmitContext (this, ig, MemberType, sourceMethod);
+ ec.CurrentAnonymousMethod = expr;
+
+ if (expr is AsyncInitializer)
+ ec.With (BuilderContext.Options.AsyncBody, true);
- ec.CurrentAnonymousMethod = host.Iterator;
return ec;
}
}
- //
- // Iterators are implemented as hidden anonymous block
- //
- public class Iterator : AnonymousExpression
+ public abstract class StateMachineInitializer : AnonymousExpression
{
- sealed class MoveNextMethodStatement : Statement
+ sealed class MoveNextBodyStatement : Statement
{
- Iterator iterator;
+ readonly StateMachineInitializer state_machine;
- public MoveNextMethodStatement (Iterator iterator)
+ public MoveNextBodyStatement (StateMachineInitializer stateMachine)
{
- this.iterator = iterator;
- this.loc = iterator.Location;
+ this.state_machine = stateMachine;
+ this.loc = stateMachine.Location;
}
protected override void CloneTo (CloneContext clonectx, Statement target)
protected override void DoEmit (EmitContext ec)
{
- iterator.EmitMoveNext (ec);
+ state_machine.EmitMoveNext (ec);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ // Don't create sequence point
+ DoEmit (ec);
+ }
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ return state_machine.ReturnType.Kind != MemberKind.Void;
+ }
+
+ public override Reachability MarkReachable (Reachability rc)
+ {
+ base.MarkReachable (rc);
+
+ if (state_machine.ReturnType.Kind != MemberKind.Void)
+ rc = Reachability.CreateUnreachable ();
+
+ return rc;
}
}
- public readonly IMethodData OriginalMethod;
- public readonly TypeContainer Host;
- public readonly bool IsEnumerable;
- List<ResumableStatement> resume_points;
+ public readonly TypeDefinition Host;
+ protected StateMachine storey;
//
- // The state as we generate the iterator
+ // The state as we generate the machine
//
- Label move_next_ok, move_next_error;
- LocalBuilder skip_finally, current_pc;
+ Label move_next_ok;
+ Label iterator_body_end;
+ protected Label move_next_error;
+ LocalBuilder skip_finally;
+ protected LocalBuilder current_pc;
+ protected List<ResumableStatement> resume_points;
+
+ protected StateMachineInitializer (ParametersBlock block, TypeDefinition host, TypeSpec returnType)
+ : base (block, returnType, block.StartLocation)
+ {
+ this.Host = host;
+ }
+
+ #region Properties
+
+ public Label BodyEnd {
+ get {
+ return iterator_body_end;
+ }
+ }
+
+ public LocalBuilder CurrentPC
+ {
+ get {
+ return current_pc;
+ }
+ }
public LocalBuilder SkipFinally {
- get { return skip_finally; }
+ get {
+ return skip_finally;
+ }
}
- public LocalBuilder CurrentPC {
- get { return current_pc; }
+ public override AnonymousMethodStorey Storey {
+ get {
+ return storey;
+ }
}
- public Block Container {
- get { return OriginalMethod.Block; }
+ #endregion
+
+ public int AddResumePoint (ResumableStatement stmt)
+ {
+ if (resume_points == null)
+ resume_points = new List<ResumableStatement> ();
+
+ resume_points.Add (stmt);
+ return resume_points.Count;
}
- public GenericMethod GenericMethod {
- get { return OriginalMethod.GenericMethod; }
+ public override Expression CreateExpressionTree (ResolveContext ec)
+ {
+ throw new NotSupportedException ("ET");
}
- public readonly TypeSpec OriginalIteratorType;
+ protected virtual BlockContext CreateBlockContext (BlockContext bc)
+ {
+ var ctx = new BlockContext (bc, block, bc.ReturnType);
+ ctx.CurrentAnonymousMethod = this;
- IteratorStorey IteratorHost;
+ ctx.AssignmentInfoOffset = bc.AssignmentInfoOffset;
+ ctx.EnclosingLoop = bc.EnclosingLoop;
+ ctx.EnclosingLoopOrSwitch = bc.EnclosingLoopOrSwitch;
+ ctx.Switch = bc.Switch;
- public enum State {
- Running = -3, // Used only in CurrentPC, never stored into $PC
- Uninitialized = -2,
- After = -1,
- Start = 0
+ return ctx;
}
- public void EmitYieldBreak (EmitContext ec, bool unwind_protect)
+ protected override Expression DoResolve (ResolveContext rc)
{
- ec.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, move_next_error);
+ var ctx = CreateBlockContext ((BlockContext) rc);
+
+ Block.Resolve (ctx);
+
+ if (!rc.IsInProbingMode) {
+ var move_next = new StateMachineMethod (storey, this, new TypeExpression (ReturnType, loc), Modifiers.PUBLIC, new MemberName ("MoveNext", loc), 0);
+ move_next.Block.AddStatement (new MoveNextBodyStatement (this));
+ storey.AddEntryMethod (move_next);
+ }
+
+ eclass = ExprClass.Value;
+ return this;
}
- void EmitMoveNext_NoResumePoints (EmitContext ec, Block original_block)
+ public override void Emit (EmitContext ec)
{
- ec.Emit (OpCodes.Ldarg_0);
- ec.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec);
+ //
+ // Load state machine instance
+ //
+ storey.Instance.Emit (ec);
+ }
- ec.Emit (OpCodes.Ldarg_0);
- ec.EmitInt ((int) State.After);
- ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);
+ void EmitMoveNext_NoResumePoints (EmitContext ec)
+ {
+ ec.EmitThis ();
+ ec.Emit (OpCodes.Ldfld, storey.PC.Spec);
+
+ ec.EmitThis ();
+ ec.EmitInt ((int) IteratorStorey.State.After);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
// We only care if the PC is zero (start executing) or non-zero (don't do anything)
ec.Emit (OpCodes.Brtrue, move_next_error);
- SymbolWriter.StartIteratorBody (ec);
- original_block.Emit (ec);
- SymbolWriter.EndIteratorBody (ec);
+ iterator_body_end = ec.DefineLabel ();
+
+ block.EmitEmbedded (ec);
+
+ ec.MarkLabel (iterator_body_end);
+
+ EmitMoveNextEpilogue (ec);
ec.MarkLabel (move_next_error);
- ec.Emit (OpCodes.Ldc_I4_0);
- ec.Emit (OpCodes.Ret);
+
+ if (ReturnType.Kind != MemberKind.Void) {
+ ec.EmitInt (0);
+ ec.Emit (OpCodes.Ret);
+ }
}
void EmitMoveNext (EmitContext ec)
move_next_error = ec.DefineLabel ();
if (resume_points == null) {
- EmitMoveNext_NoResumePoints (ec, block);
+ EmitMoveNext_NoResumePoints (ec);
return;
}
-
+
current_pc = ec.GetTemporaryLocal (ec.BuiltinTypes.UInt);
- ec.Emit (OpCodes.Ldarg_0);
- ec.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec);
+ ec.EmitThis ();
+ ec.Emit (OpCodes.Ldfld, storey.PC.Spec);
ec.Emit (OpCodes.Stloc, current_pc);
// We're actually in state 'running', but this is as good a PC value as any if there's an abnormal exit
- ec.Emit (OpCodes.Ldarg_0);
- ec.EmitInt ((int) State.After);
- ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);
+ ec.EmitThis ();
+ ec.EmitInt ((int) IteratorStorey.State.After);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
- Label [] labels = new Label [1 + resume_points.Count];
- labels [0] = ec.DefineLabel ();
+ Label[] labels = new Label[1 + resume_points.Count];
+ labels[0] = ec.DefineLabel ();
bool need_skip_finally = false;
for (int i = 0; i < resume_points.Count; ++i) {
- ResumableStatement s = resume_points [i];
+ ResumableStatement s = resume_points[i];
need_skip_finally |= s is ExceptionStatement;
- labels [i+1] = s.PrepareForEmit (ec);
+ labels[i + 1] = s.PrepareForEmit (ec);
}
if (need_skip_finally) {
skip_finally = ec.GetTemporaryLocal (ec.BuiltinTypes.Bool);
- ec.Emit (OpCodes.Ldc_I4_0);
+ ec.EmitInt (0);
ec.Emit (OpCodes.Stloc, skip_finally);
}
- SymbolWriter.StartIteratorDispatcher (ec);
+ var async_init = this as AsyncInitializer;
+ if (async_init != null)
+ ec.BeginExceptionBlock ();
+
ec.Emit (OpCodes.Ldloc, current_pc);
ec.Emit (OpCodes.Switch, labels);
- ec.Emit (OpCodes.Br, move_next_error);
- SymbolWriter.EndIteratorDispatcher (ec);
+ ec.Emit (async_init != null ? OpCodes.Leave : OpCodes.Br, move_next_error);
- ec.MarkLabel (labels [0]);
+ ec.MarkLabel (labels[0]);
- SymbolWriter.StartIteratorBody (ec);
- block.Emit (ec);
- SymbolWriter.EndIteratorBody (ec);
+ iterator_body_end = ec.DefineLabel ();
- SymbolWriter.StartIteratorDispatcher (ec);
+ block.EmitEmbedded (ec);
- ec.Emit (OpCodes.Ldarg_0);
- ec.EmitInt ((int) State.After);
- ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);
+ ec.MarkLabel (iterator_body_end);
- ec.MarkLabel (move_next_error);
- ec.EmitInt (0);
- ec.Emit (OpCodes.Ret);
-
- ec.MarkLabel (move_next_ok);
- ec.Emit (OpCodes.Ldc_I4_1);
- ec.Emit (OpCodes.Ret);
+ if (async_init != null) {
+ var catch_value = LocalVariable.CreateCompilerGenerated (ec.Module.Compiler.BuiltinTypes.Exception, block, Location);
- SymbolWriter.EndIteratorDispatcher (ec);
- }
+ ec.BeginCatchBlock (catch_value.Type);
+ catch_value.EmitAssign (ec);
- public void EmitDispose (EmitContext ec)
- {
- Label end = ec.DefineLabel ();
+ ec.EmitThis ();
+ ec.EmitInt ((int) IteratorStorey.State.After);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
- Label [] labels = null;
- int n_resume_points = resume_points == null ? 0 : resume_points.Count;
- for (int i = 0; i < n_resume_points; ++i) {
- ResumableStatement s = resume_points [i];
- Label ret = s.PrepareForDispose (ec, end);
- if (ret.Equals (end) && labels == null)
- continue;
- if (labels == null) {
- labels = new Label [resume_points.Count + 1];
- for (int j = 0; j <= i; ++j)
- labels [j] = end;
- }
+ ((AsyncTaskStorey) async_init.Storey).EmitSetException (ec, new LocalVariableReference (catch_value, Location));
- labels [i+1] = ret;
+ ec.Emit (OpCodes.Leave, move_next_ok);
+ ec.EndExceptionBlock ();
}
- if (labels != null) {
- current_pc = ec.GetTemporaryLocal (ec.BuiltinTypes.UInt);
- ec.Emit (OpCodes.Ldarg_0);
- ec.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec);
- ec.Emit (OpCodes.Stloc, current_pc);
- }
+ ec.Mark (Block.Original.EndLocation);
+ ec.EmitThis ();
+ ec.EmitInt ((int) IteratorStorey.State.After);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
- ec.Emit (OpCodes.Ldarg_0);
- ec.EmitInt (1);
- ec.Emit (OpCodes.Stfld, IteratorHost.DisposingField.Spec);
+ EmitMoveNextEpilogue (ec);
- ec.Emit (OpCodes.Ldarg_0);
- ec.EmitInt ((int) State.After);
- ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);
+ ec.MarkLabel (move_next_error);
+
+ if (ReturnType.Kind != MemberKind.Void) {
+ ec.EmitInt (0);
+ ec.Emit (OpCodes.Ret);
+ }
- if (labels != null) {
- //SymbolWriter.StartIteratorDispatcher (ec.ig);
- ec.Emit (OpCodes.Ldloc, current_pc);
- ec.Emit (OpCodes.Switch, labels);
- //SymbolWriter.EndIteratorDispatcher (ec.ig);
+ ec.MarkLabel (move_next_ok);
- foreach (ResumableStatement s in resume_points)
- s.EmitForDispose (ec, this, end, true);
+ if (ReturnType.Kind != MemberKind.Void) {
+ ec.EmitInt (1);
+ ec.Emit (OpCodes.Ret);
}
-
- ec.MarkLabel (end);
}
- public int AddResumePoint (ResumableStatement stmt)
+ protected virtual void EmitMoveNextEpilogue (EmitContext ec)
{
- if (resume_points == null)
- resume_points = new List<ResumableStatement> ();
+ }
- resume_points.Add (stmt);
- return resume_points.Count;
+ public void EmitLeave (EmitContext ec, bool unwind_protect)
+ {
+ // Return ok
+ ec.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, move_next_ok);
}
//
- // Called back from Yield
+ // Called back from YieldStatement
//
- public void MarkYield (EmitContext ec, Expression expr, int resume_pc, bool unwind_protect, Label resume_point)
+ public virtual void InjectYield (EmitContext ec, Expression expr, int resume_pc, bool unwind_protect, Label resume_point)
{
- // Store the new current
- ec.Emit (OpCodes.Ldarg_0);
- expr.Emit (ec);
- ec.Emit (OpCodes.Stfld, IteratorHost.CurrentField.Spec);
-
//
// Guard against being disposed meantime
//
Label disposed = ec.DefineLabel ();
- ec.Emit (OpCodes.Ldarg_0);
- ec.Emit (OpCodes.Ldfld, IteratorHost.DisposingField.Spec);
- ec.Emit (OpCodes.Brtrue_S, disposed);
+ var iterator = storey as IteratorStorey;
+ if (iterator != null) {
+ ec.EmitThis ();
+ ec.Emit (OpCodes.Ldfld, iterator.DisposingField.Spec);
+ ec.Emit (OpCodes.Brtrue_S, disposed);
+ }
//
// store resume program-counter
//
- ec.Emit (OpCodes.Ldarg_0);
+ ec.EmitThis ();
ec.EmitInt (resume_pc);
- ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);
- ec.MarkLabel (disposed);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
+
+ if (iterator != null) {
+ ec.MarkLabel (disposed);
+ }
// mark finally blocks as disabled
if (unwind_protect && skip_finally != null) {
ec.EmitInt (1);
ec.Emit (OpCodes.Stloc, skip_finally);
}
+ }
- // Return ok
- ec.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, move_next_ok);
+ public void SetStateMachine (StateMachine stateMachine)
+ {
+ this.storey = stateMachine;
+ }
+ }
- ec.MarkLabel (resume_point);
+ //
+ // Iterators are implemented as state machine blocks
+ //
+ public class Iterator : StateMachineInitializer
+ {
+ sealed class TryFinallyBlockProxyStatement : Statement
+ {
+ TryFinallyBlock block;
+ Iterator iterator;
+
+ public TryFinallyBlockProxyStatement (Iterator iterator, TryFinallyBlock block)
+ {
+ this.iterator = iterator;
+ this.block = block;
+ }
+
+ protected override void CloneTo (CloneContext clonectx, Statement target)
+ {
+ throw new NotSupportedException ();
+ }
+
+ protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
+ {
+ throw new NotSupportedException ();
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ //
+ // Restore redirection for any captured variables
+ //
+ ec.CurrentAnonymousMethod = iterator;
+
+ using (ec.With (BuilderContext.Options.OmitDebugInfo, !ec.HasMethodSymbolBuilder)) {
+ block.EmitFinallyBody (ec);
+ }
+ }
}
- //
- // Our constructor
- //
- public Iterator (ParametersBlock block, IMethodData method, TypeContainer host, TypeSpec iterator_type, bool is_enumerable)
- : base (block, host.Compiler.BuiltinTypes.Bool, block.StartLocation)
+ public readonly IMethodData OriginalMethod;
+ public readonly bool IsEnumerable;
+ public readonly TypeSpec OriginalIteratorType;
+ int finally_hosts_counter;
+
+ public Iterator (ParametersBlock block, IMethodData method, TypeDefinition host, TypeSpec iterator_type, bool is_enumerable)
+ : base (block, host, host.Compiler.BuiltinTypes.Bool)
{
this.OriginalMethod = method;
this.OriginalIteratorType = iterator_type;
this.IsEnumerable = is_enumerable;
- this.Host = host;
this.type = method.ReturnType;
}
+ #region Properties
+
+ public ToplevelBlock Container {
+ get { return OriginalMethod.Block; }
+ }
+
public override string ContainerType {
get { return "iterator"; }
}
get { return true; }
}
- public override AnonymousMethodStorey Storey {
- get { return IteratorHost; }
- }
+ #endregion
- public override string GetSignatureForError ()
+ public Method CreateFinallyHost (TryFinallyBlock block)
{
- return OriginalMethod.GetSignatureForError ();
- }
+ var method = new Method (storey, new TypeExpression (storey.Compiler.BuiltinTypes.Void, loc),
+ Modifiers.COMPILER_GENERATED, new MemberName (CompilerGeneratedContainer.MakeName (null, null, "Finally", finally_hosts_counter++), loc),
+ ParametersCompiled.EmptyReadOnlyParameters, null);
- protected override Expression DoResolve (ResolveContext ec)
- {
- IteratorHost = (IteratorStorey) block.TopBlock.AnonymousMethodStorey;
+ method.Block = new ToplevelBlock (method.Compiler, method.ParameterInfo, loc,
+ ToplevelBlock.Flags.CompilerGenerated | ToplevelBlock.Flags.NoFlowAnalysis);
+ method.Block.AddStatement (new TryFinallyBlockProxyStatement (this, block));
- BlockContext ctx = new BlockContext (ec, block, ReturnType);
- ctx.CurrentAnonymousMethod = this;
+ // Cannot it add to storey because it'd be emitted before nested
+ // anonoymous methods which could capture shared variable
- ctx.StartFlowBranching (this, ec.CurrentBranching);
- Block.Resolve (ctx);
- ctx.EndFlowBranching ();
+ return method;
+ }
- var move_next = new IteratorMethod (IteratorHost, new TypeExpression (ec.BuiltinTypes.Bool, loc),
- Modifiers.PUBLIC, new MemberName ("MoveNext", Location));
- move_next.Block.AddStatement (new MoveNextMethodStatement (this));
- IteratorHost.AddMethod (move_next);
+ public void EmitYieldBreak (EmitContext ec, bool unwind_protect)
+ {
+ ec.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, move_next_error);
+ }
- eclass = ExprClass.Value;
- return this;
+ public override string GetSignatureForError ()
+ {
+ return OriginalMethod.GetSignatureForError ();
}
public override void Emit (EmitContext ec)
//
// Load Iterator storey instance
//
- IteratorHost.Instance.Emit (ec);
+ storey.Instance.Emit (ec);
//
// Initialize iterator PC when it's unitialized
//
if (IsEnumerable) {
ec.Emit (OpCodes.Dup);
- ec.EmitInt ((int)State.Uninitialized);
+ ec.EmitInt ((int)IteratorStorey.State.Uninitialized);
- var field = IteratorHost.PC.Spec;
- if (Storey.MemberName.IsGeneric) {
+ var field = storey.PC.Spec;
+ if (storey.MemberName.IsGeneric) {
field = MemberCache.GetMember (Storey.Instance.Type, field);
}
}
}
- public override Expression CreateExpressionTree (ResolveContext ec)
+ public void EmitDispose (EmitContext ec)
{
- throw new NotSupportedException ("ET");
+ if (resume_points == null)
+ return;
+
+ Label end = ec.DefineLabel ();
+
+ Label[] labels = null;
+ for (int i = 0; i < resume_points.Count; ++i) {
+ ResumableStatement s = resume_points[i];
+ Label ret = s.PrepareForDispose (ec, end);
+ if (ret.Equals (end) && labels == null)
+ continue;
+ if (labels == null) {
+ labels = new Label[resume_points.Count + 1];
+ for (int j = 0; j <= i; ++j)
+ labels[j] = end;
+ }
+
+ labels[i + 1] = ret;
+ }
+
+ if (labels != null) {
+ current_pc = ec.GetTemporaryLocal (ec.BuiltinTypes.UInt);
+ ec.EmitThis ();
+ ec.Emit (OpCodes.Ldfld, storey.PC.Spec);
+ ec.Emit (OpCodes.Stloc, current_pc);
+ }
+
+ ec.EmitThis ();
+ ec.EmitInt (1);
+ ec.Emit (OpCodes.Stfld, ((IteratorStorey) storey).DisposingField.Spec);
+
+ ec.EmitThis ();
+ ec.EmitInt ((int) IteratorStorey.State.After);
+ ec.Emit (OpCodes.Stfld, storey.PC.Spec);
+
+ if (labels != null) {
+ //SymbolWriter.StartIteratorDispatcher (ec.ig);
+ ec.Emit (OpCodes.Ldloc, current_pc);
+ ec.Emit (OpCodes.Switch, labels);
+ //SymbolWriter.EndIteratorDispatcher (ec.ig);
+
+ foreach (ResumableStatement s in resume_points)
+ s.EmitForDispose (ec, current_pc, end, true);
+ }
+
+ ec.MarkLabel (end);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ throw new NotImplementedException ();
+ }
+
+ public override void InjectYield (EmitContext ec, Expression expr, int resume_pc, bool unwind_protect, Label resume_point)
+ {
+ // Store the new value into current
+ var fe = new FieldExpr (((IteratorStorey) storey).CurrentField, loc);
+ fe.InstanceExpression = new CompilerGeneratedThis (storey.CurrentType, loc);
+ fe.EmitAssign (ec, expr, false, false);
+
+ base.InjectYield (ec, expr, resume_pc, unwind_protect, resume_point);
+
+ EmitLeave (ec, unwind_protect);
+
+ ec.MarkLabel (resume_point);
}
- public static void CreateIterator (IMethodData method, TypeContainer parent, Modifiers modifiers)
+ public static void CreateIterator (IMethodData method, TypeDefinition parent, Modifiers modifiers)
{
bool is_enumerable;
TypeSpec iterator_type;
"The body of `{0}' cannot be an iterator block " +
"because `{1}' is not an iterator interface type",
method.GetSignatureForError (),
- TypeManager.CSharpName (ret));
+ ret.GetSignatureForError ());
return;
}
for (int i = 0; i < parameters.Count; i++) {
Parameter p = parameters [i];
Parameter.Modifier mod = p.ModFlags;
- if ((mod & Parameter.Modifier.ISBYREF) != 0) {
+ if ((mod & Parameter.Modifier.RefOutMask) != 0) {
parent.Compiler.Report.Error (1623, p.Location,
"Iterators cannot have ref or out parameters");
return;
if (parameters.Types [i].IsPointer) {
parent.Compiler.Report.Error (1637, p.Location,
- "Iterators cannot have unsafe parameters or " +
- "yield types");
+ "Iterators cannot have unsafe parameters or yield types");
return;
}
}
parent.Compiler.Report.Error (1629, method.Location, "Unsafe code may not appear in iterators");
}
- method.Block.WrapIntoIterator (method, parent, iterator_type, is_enumerable);
+ method.Block = method.Block.ConvertToIterator (method, parent, iterator_type, is_enumerable);
}
static bool CheckType (TypeSpec ret, TypeContainer parent, out TypeSpec original_iterator_type, out bool is_enumerable)
projects / mono.git / blobdiff