// Copyright 2011 Xamarin Inc.
//
-// TODO:
-// Flow analysis for Yield.
-//
-
using System;
using System.Collections.Generic;
+using Mono.CompilerServices.SymbolWriter;
#if STATIC
using IKVM.Reflection.Emit;
machine_initializer = bc.CurrentAnonymousMethod as T;
if (!bc.CurrentBranching.CurrentUsageVector.IsUnreachable)
- unwind_protect = bc.CurrentBranching.AddResumePoint (this, out resume_pc);
+ unwind_protect = bc.CurrentBranching.AddResumePoint (this, this, out resume_pc);
return true;
}
Field pc_field;
StateMachineMethod method;
+ int local_name_idx;
- protected StateMachine (Block block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name)
- : base (block, parent, host, tparams, name)
+ protected StateMachine (ParametersBlock block, TypeDefinition parent, MemberBase host, TypeParameters tparams, string name, MemberKind kind)
+ : base (block, parent, host, tparams, name, kind)
{
}
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
TypeExpr iterator_type_expr;
Field current_field;
Field disposing_field;
- int local_name_idx;
- TypeExpr enumerator_type;
- TypeExpr enumerable_type;
- TypeArguments generic_args;
- TypeExpr generic_enumerator_type;
- TypeExpr generic_enumerable_type;
+ TypeSpec generic_enumerator_type;
+ TypeSpec generic_enumerable_type;
public IteratorStorey (Iterator iterator)
: base (iterator.Container.ParametersBlock, iterator.Host,
- iterator.OriginalMethod as MemberBase, iterator.OriginalMethod.CurrentTypeParameters, "Iterator")
+ iterator.OriginalMethod as MemberBase, iterator.OriginalMethod.CurrentTypeParameters, "Iterator", MemberKind.Class)
{
this.Iterator = iterator;
}
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;
+ base_class = null;
- return base.ResolveBaseTypes (out base_class);
+ base_type = Compiler.BuiltinTypes.Object;
+ return ifaces.ToArray ();
}
protected override bool DoDefineMembers ()
var name = new MemberName ("GetEnumerator", null, explicit_iface, Location.Null);
if (generic_enumerator_type != null) {
- explicit_iface = new GenericTypeExpr (Module.PredefinedTypes.IEnumerableGeneric.Resolve (), generic_args, Location);
+ explicit_iface = new TypeExpression (generic_enumerable_type, Location);
var gname = new MemberName ("GetEnumerator", null, explicit_iface, Location.Null);
- Method gget_enumerator = GetEnumeratorMethod.Create (this, generic_enumerator_type, gname);
+ Method gget_enumerator = GetEnumeratorMethod.Create (this, new TypeExpression (generic_enumerator_type, Location), gname);
//
// Just call generic GetEnumerator implementation
//
var stmt = new Return (new Invocation (new DynamicMethodGroupExpr (gget_enumerator, Location), null), Location);
- Method get_enumerator = GetEnumeratorMethod.Create (this, enumerator_type, name, stmt);
+ Method get_enumerator = GetEnumeratorMethod.Create (this, new TypeExpression (Compiler.BuiltinTypes.IEnumerator, Location), name, stmt);
Members.Add (get_enumerator);
Members.Add (gget_enumerator);
} else {
- Members.Add (GetEnumeratorMethod.Create (this, enumerator_type, name));
+ Members.Add (GetEnumeratorMethod.Create (this, new TypeExpression (Compiler.BuiltinTypes.IEnumerator, Location), name));
}
}
FullNamedExpression explicit_iface;
if (is_generic) {
- explicit_iface = new GenericTypeExpr (Module.PredefinedTypes.IEnumeratorGeneric.Resolve (), generic_args, Location);
+ explicit_iface = new TypeExpression (generic_enumerator_type, Location);
type = iterator_type_expr;
} else {
explicit_iface = new TypeExpression (Module.Compiler.BuiltinTypes.IEnumerator, Location);
reset.Block.AddStatement (new Throw (new New (new TypeExpression (ex_type, Location), null, Location), Location));
}
- protected override void EmitHoistedParameters (EmitContext ec, IList<HoistedParameter> hoisted)
+ protected override void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
{
base.EmitHoistedParameters (ec, hoisted);
base.EmitHoistedParameters (ec, hoisted_params_copy);
}
-
- protected override string GetVariableMangledName (LocalVariable local_info)
- {
- return "<" + local_info.Name + ">__" + local_name_idx++.ToString ("X");
- }
}
public class StateMachineMethod : Method
Block = new ToplevelBlock (host.Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null);
}
- 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)
protected override Expression DoResolve (ResolveContext ec)
{
- storey = (StateMachine) block.Parent.ParametersBlock.AnonymousMethodStorey;
-
var ctx = CreateBlockContext (ec);
Block.Resolve (ctx);
public override void Emit (EmitContext ec)
{
//
- // Load Iterator storey instance
+ // Load state machine instance
//
storey.Instance.Emit (ec);
}
iterator_body_end = ec.DefineLabel ();
- if (ec.EmitAccurateDebugInfo && ec.Mark (Block.Original.StartLocation)) {
- ec.Emit (OpCodes.Nop);
- }
-
- block.Emit (ec);
+ block.EmitEmbedded (ec);
ec.MarkLabel (iterator_body_end);
iterator_body_end = ec.DefineLabel ();
- if (ec.EmitAccurateDebugInfo && ec.Mark (Block.Original.StartLocation)) {
- ec.Emit (OpCodes.Nop);
- }
-
- block.Emit (ec);
+ block.EmitEmbedded (ec);
ec.MarkLabel (iterator_body_end);
ec.Emit (OpCodes.Stloc, skip_finally);
}
}
+
+ public void SetStateMachine (StateMachine stateMachine)
+ {
+ this.storey = stateMachine;
+ }
}
//
- // Iterators are implemented as hidden anonymous block
+ // 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 void DoEmit (EmitContext ec)
+ {
+ //
+ // Restore redirection for any captured variables
+ //
+ ec.CurrentAnonymousMethod = iterator;
+
+ using (ec.With (BuilderContext.Options.OmitDebugInfo, !ec.HasMethodSymbolBuilder)) {
+ block.EmitFinallyBody (ec);
+ }
+ }
+ }
+
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.type = method.ReturnType;
}
- public Block Container {
+ #region Properties
+
+ public ToplevelBlock Container {
get { return OriginalMethod.Block; }
}
get { return true; }
}
+ #endregion
+
+ public Method CreateFinallyHost (TryFinallyBlock block)
+ {
+ 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);
+
+ method.Block = new ToplevelBlock (method.Compiler, method.ParameterInfo, loc);
+ method.Block.IsCompilerGenerated = true;
+ method.Block.AddStatement (new TryFinallyBlockProxyStatement (this, block));
+
+ // Cannot it add to storey because it'd be emitted before nested
+ // anonoymous methods which could capture shared variable
+
+ return method;
+ }
+
public void EmitYieldBreak (EmitContext ec, bool unwind_protect)
{
ec.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, move_next_error);
public void EmitDispose (EmitContext ec)
{
+ if (resume_points == null)
+ return;
+
Label end = ec.DefineLabel ();
Label[] labels = null;
- int n_resume_points = resume_points == null ? 0 : resume_points.Count;
- for (int i = 0; i < n_resume_points; ++i) {
+ 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)
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;
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)
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