//
// Author:
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@gmail.com)
//
-// (C) 2003 Ximian, Inc.
+// 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.
-// Emit calls to base object constructor.
-//
-// Generics note:
-// Current should be defined to return T, and IEnumerator.Current returns object
//
using System;
-using System.Collections;
+using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
namespace Mono.CSharp {
- public class Yield : ResumableStatement {
+ class Yield : ResumableStatement {
Expression expr;
bool unwind_protect;
-
+ Iterator iterator;
int resume_pc;
public Yield (Expression expr, Location l)
loc = l;
}
- public static bool CheckContext (EmitContext ec, Location loc, bool isYieldBreak)
+ public static bool CheckContext (ResolveContext ec, Location loc)
{
- for (Block block = ec.CurrentBlock; block != null; block = block.Parent) {
- if (!block.Unsafe)
- continue;
-
- Report.Error (1629, loc, "Unsafe code may not appear in iterators");
- return false;
- }
-
//
// We can't use `ec.InUnsafe' here because it's allowed to have an iterator
// inside an unsafe class. See test-martin-29.cs for an example.
//
if (!ec.CurrentAnonymousMethod.IsIterator) {
- Report.Error (1621, loc,
+ ec.Report.Error (1621, loc,
"The yield statement cannot be used inside " +
"anonymous method blocks");
return false;
return true;
}
+
+ public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
+ {
+ expr.MutateHoistedGenericType (storey);
+ }
- public override bool Resolve (EmitContext ec)
+ public override bool Resolve (BlockContext ec)
{
- Report.Debug (64, "RESOLVE YIELD", this, ec, expr, expr.GetType ());
expr = expr.Resolve (ec);
if (expr == null)
return false;
Report.Debug (64, "RESOLVE YIELD #1", this, ec, expr, expr.GetType (),
ec.CurrentAnonymousMethod, ec.CurrentIterator);
- if (!CheckContext (ec, loc, false))
+ if (!CheckContext (ec, loc))
return false;
- Iterator iterator = ec.CurrentIterator;
- if (expr.Type != iterator.IteratorType) {
+ iterator = ec.CurrentIterator;
+ if (expr.Type != iterator.OriginalIteratorType) {
expr = Convert.ImplicitConversionRequired (
- ec, expr, iterator.IteratorType, loc);
+ ec, expr, iterator.OriginalIteratorType, loc);
if (expr == null)
return false;
}
- unwind_protect = ec.CurrentBranching.AddResumePoint (this, loc, out resume_pc);
+ if (!ec.CurrentBranching.CurrentUsageVector.IsUnreachable)
+ unwind_protect = ec.CurrentBranching.AddResumePoint (this, loc, out resume_pc);
return true;
}
protected override void DoEmit (EmitContext ec)
{
- ec.CurrentIterator.MarkYield (ec, expr, resume_pc, unwind_protect, resume_point);
+ iterator.MarkYield (ec, expr, resume_pc, unwind_protect, resume_point);
}
protected override void CloneTo (CloneContext clonectx, Statement t)
}
}
- public class YieldBreak : ExitStatement {
+ public class YieldBreak : ExitStatement
+ {
+ Iterator iterator;
+
public YieldBreak (Location l)
{
loc = l;
}
- public override void Error_FinallyClause ()
+ public override void Error_FinallyClause (Report Report)
{
Report.Error (1625, loc, "Cannot yield in the body of a finally clause");
}
- protected override bool DoResolve (EmitContext ec)
- {
- return Yield.CheckContext (ec, loc, true);
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- ec.CurrentIterator.EmitYieldBreak (ec.ig, unwind_protect);
- }
- }
-
- public class IteratorHost : RootScopeInfo
- {
- public readonly Iterator Iterator;
-
- TypeExpr iterator_type_expr;
- Field pc_field;
- Field current_field;
- MethodInfo dispose_method;
-
- TypeExpr enumerator_type;
- TypeExpr enumerable_type;
- TypeArguments generic_args;
- TypeExpr generic_enumerator_type;
-#if GMCS_SOURCE
- TypeExpr generic_enumerable_type;
-#endif
-
- public IteratorHost (Iterator iterator)
- : base (iterator.Container.Toplevel, iterator.Host, iterator.GenericMethod,
- iterator.Location)
- {
- this.Iterator = iterator;
- }
-
- public override bool IsIterator {
- get { return true; }
- }
-
- public MethodInfo Dispose {
- get { return dispose_method; }
- }
-
- public Field PC {
- get { return pc_field; }
- }
-
- public Field CurrentField {
- get { return current_field; }
- }
-
- public Type IteratorType {
- get { return iterator_type_expr.Type; }
- }
-
- public override TypeExpr [] GetClassBases (out TypeExpr base_class)
+ protected override void CloneTo (CloneContext clonectx, Statement target)
{
- iterator_type_expr = InflateType (Iterator.OriginalIteratorType);
-
-#if GMCS_SOURCE
- generic_args = new TypeArguments (Location);
- generic_args.Add (iterator_type_expr);
-#endif
-
- ArrayList list = new ArrayList ();
- if (Iterator.IsEnumerable) {
- enumerable_type = new TypeExpression (
- TypeManager.ienumerable_type, Location);
- list.Add (enumerable_type);
-
-#if GMCS_SOURCE
- generic_enumerable_type = new ConstructedType (
- TypeManager.generic_ienumerable_type,
- generic_args, Location);
- list.Add (generic_enumerable_type);
-#endif
- }
-
- enumerator_type = new TypeExpression (
- TypeManager.ienumerator_type, Location);
- list.Add (enumerator_type);
-
- list.Add (new TypeExpression (TypeManager.idisposable_type, Location));
-
-#if GMCS_SOURCE
- generic_enumerator_type = new ConstructedType (
- TypeManager.generic_ienumerator_type,
- generic_args, Location);
- list.Add (generic_enumerator_type);
-#endif
-
- Bases = list;
-
- return base.GetClassBases (out base_class);
+ throw new NotSupportedException ();
}
- protected override bool DoResolveMembers ()
+ protected override bool DoResolve (BlockContext ec)
{
- pc_field = CaptureVariable ("$PC", TypeManager.system_int32_expr);
- current_field = CaptureVariable ("$current", iterator_type_expr);
-
-#if GMCS_SOURCE
- Define_Current (true);
-#endif
- Define_Current (false);
- new DisposeMethod (this);
- Define_Reset ();
-
- if (Iterator.IsEnumerable) {
- new GetEnumeratorMethod (this, false);
-#if GMCS_SOURCE
- new GetEnumeratorMethod (this, true);
-#endif
- }
-
- return base.DoResolveMembers ();
+ iterator = ec.CurrentIterator;
+ return Yield.CheckContext (ec, loc);
}
- public void CaptureScopes ()
+ protected override void DoEmit (EmitContext ec)
{
- Report.Debug (128, "DEFINE ITERATOR HOST", this, scopes);
-
- foreach (ScopeInfo si in scopes)
- CaptureScope (si);
-
- foreach (ScopeInfo si in scopes) {
- if (!si.Define ())
- throw new InternalErrorException ();
- if (si.DefineType () == null)
- throw new InternalErrorException ();
- if (!si.ResolveType ())
- throw new InternalErrorException ();
- if (!si.ResolveMembers ())
- throw new InternalErrorException ();
- if (!si.DefineMembers ())
- throw new InternalErrorException ();
- }
+ iterator.EmitYieldBreak (ec.ig, unwind_protect);
}
- protected override bool DoDefineMembers ()
+ public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
- if (!base.DoDefineMembers ())
- return false;
-
- FetchMethodDispose ();
-
- return true;
+ // nothing to do
}
+ }
- protected override void EmitScopeConstructor (EmitContext ec)
- {
- ec.ig.Emit (OpCodes.Ldarg_0);
- ec.ig.Emit (OpCodes.Ldarg_1);
- ec.ig.Emit (OpCodes.Stfld, pc_field.FieldBuilder);
- base.EmitScopeConstructor (ec);
- }
+ //
+ // Wraps method block into iterator wrapper block
+ //
+ class IteratorStatement : Statement
+ {
+ Iterator iterator;
+ Block original_block;
- void FetchMethodDispose ()
+ public IteratorStatement (Iterator iterator, Block original_block)
{
- MemberList dispose_list;
-
- dispose_list = FindMembers (
- CurrentType != null ? CurrentType : TypeBuilder,
- MemberTypes.Method, BindingFlags.Public | BindingFlags.Instance,
- Type.FilterName, "Dispose");
-
- if (dispose_list.Count != 1)
- throw new InternalErrorException ("Cannot find Dipose() method.");
-
- dispose_method = (MethodInfo) dispose_list [0];
+ this.iterator = iterator;
+ this.original_block = original_block;
+ this.loc = iterator.Location;
}
- void Define_Current (bool is_generic)
+ protected override void CloneTo (CloneContext clonectx, Statement target)
{
- MemberName left;
- Expression type;
-
- if (is_generic) {
- left = new MemberName (
- "System.Collections.Generic.IEnumerator",
- generic_args, Location);
- type = iterator_type_expr;
- } else {
- left = new MemberName ("System.Collections.IEnumerator", Location);
- type = TypeManager.system_object_expr;
- }
-
- MemberName name = new MemberName (left, "Current", null, Location);
-
- ToplevelBlock get_block = new ToplevelBlock (Location);
- get_block.AddStatement (new CurrentBlock (this, is_generic));
-
- Accessor getter = new Accessor (get_block, 0, null, Location);
-
- Property current = new Property (
- this, type, 0, false, name, null, getter, null, false);
- AddProperty (current);
+ IteratorStatement t = (IteratorStatement) target;
+ t.original_block = (ExplicitBlock) original_block.Clone (clonectx);
+ t.iterator = (Iterator) iterator.Clone (clonectx);
}
- void Define_Reset ()
+ public override bool Resolve (BlockContext ec)
{
- Method reset = new Method (
- this, null, TypeManager.system_void_expr, Modifiers.PUBLIC,
- false, new MemberName ("Reset", Location),
- Parameters.EmptyReadOnlyParameters, null);
- AddMethod (reset);
-
- reset.Block = new ToplevelBlock (Location);
- reset.Block.AddStatement (Create_ThrowNotSupported ());
+ ec.StartFlowBranching (iterator);
+ bool ok = original_block.Resolve (ec);
+ ec.EndFlowBranching ();
+ return ok;
}
- Statement Create_ThrowNotSupported ()
+ protected override void DoEmit (EmitContext ec)
{
- TypeExpr ex_type = new TypeLookupExpression ("System.NotSupportedException");
-
- return new Throw (new New (ex_type, null, Location), Location);
+ iterator.EmitMoveNext (ec, original_block);
}
- protected override ScopeInitializer CreateScopeInitializer ()
+ public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
- return new IteratorHostInitializer (this);
+ original_block.MutateHoistedGenericType (storey);
+ iterator.MutateHoistedGenericType (storey);
}
+ }
- protected class IteratorHostInitializer : RootScopeInitializer
+ public class IteratorStorey : AnonymousMethodStorey
+ {
+ class IteratorMethod : Method
{
- new public readonly IteratorHost Host;
- protected Iterator.State state;
+ readonly IteratorStorey host;
- public IteratorHostInitializer (IteratorHost host)
- : base (host)
+ public IteratorMethod (IteratorStorey host, FullNamedExpression returnType, Modifiers mod, MemberName name)
+ : base (host, null, returnType, mod | Modifiers.DEBUGGER_HIDDEN | Modifiers.COMPILER_GENERATED,
+ name, ParametersCompiled.EmptyReadOnlyParameters, null)
{
- this.Host = host;
- }
+ this.host = host;
- protected override bool DoResolveInternal (EmitContext ec)
- {
- if (this is EnumeratorScopeInitializer)
- state = Iterator.State.Start;
- else if (Host.Iterator.IsEnumerable)
- state = Iterator.State.Uninitialized;
- else
- state = Iterator.State.Start;
-
- return base.DoResolveInternal (ec);
+ Block = new ToplevelBlock (Compiler, host.Iterator.Container.Toplevel, ParametersCompiled.EmptyReadOnlyParameters, Location);
}
- protected override void EmitScopeConstructor (EmitContext ec)
+ public override EmitContext CreateEmitContext (ILGenerator ig)
{
- ec.ig.Emit (OpCodes.Ldc_I4, (int) state);
- base.EmitScopeConstructor (ec);
+ EmitContext ec = new EmitContext (this, ig, MemberType);
+
+ ec.CurrentAnonymousMethod = host.Iterator;
+ return ec;
}
}
- protected class GetEnumeratorMethod : Method
+ class GetEnumeratorMethod : IteratorMethod
{
- public IteratorHost Host;
-
- static MemberName GetMemberName (IteratorHost host, bool is_generic)
- {
- MemberName left;
- if (is_generic) {
- left = new MemberName (
- "System.Collections.Generic.IEnumerable",
- host.generic_args, host.Location);
- } else {
- left = new MemberName (
- "System.Collections.IEnumerable", host.Location);
- }
-
- return new MemberName (left, "GetEnumerator", host.Location);
- }
-
- public GetEnumeratorMethod (IteratorHost host, bool is_generic)
- : base (host, null, is_generic ?
- host.generic_enumerator_type : host.enumerator_type,
- 0, false, GetMemberName (host, is_generic),
- Parameters.EmptyReadOnlyParameters, null)
+ sealed class GetEnumeratorStatement : Statement
{
- this.Host = host;
+ IteratorStorey host;
+ IteratorMethod host_method;
- host.AddMethod (this);
+ Expression new_storey;
- Block = new ToplevelBlock (host.Iterator.Container.Toplevel, null, Location);
- Block.AddStatement (new GetEnumeratorStatement (host, Type));
- }
+ public GetEnumeratorStatement (IteratorStorey host, IteratorMethod host_method)
+ {
+ this.host = host;
+ this.host_method = host_method;
+ loc = host_method.Location;
+ }
- public override EmitContext CreateEmitContext (DeclSpace tc, ILGenerator ig)
- {
- EmitContext ec = new EmitContext (
- this, tc, this.ds, Location, ig, MemberType, ModFlags, false);
+ protected override void CloneTo (CloneContext clonectx, Statement target)
+ {
+ throw new NotSupportedException ();
+ }
- ec.CurrentAnonymousMethod = Host.Iterator;
- return ec;
- }
+ public override bool Resolve (BlockContext ec)
+ {
+ TypeExpression storey_type_expr = new TypeExpression (host.TypeBuilder, loc);
+ List<Expression> init = null;
+ if (host.hoisted_this != null) {
+ init = new List<Expression> (host.hoisted_params == null ? 1 : host.HoistedParameters.Count + 1);
+ HoistedThis ht = host.hoisted_this;
+ FieldExpr from = new FieldExpr (ht.Field, loc);
+ from.InstanceExpression = CompilerGeneratedThis.Instance;
+ init.Add (new ElementInitializer (ht.Field.Name, from, loc));
+ }
- protected class GetEnumeratorStatement : Statement
- {
- IteratorHost host;
- Expression type;
+ if (host.hoisted_params != null) {
+ if (init == null)
+ init = new List<Expression> (host.HoistedParameters.Count);
- ExpressionStatement initializer;
- Expression cast;
- MethodInfo ce;
+ 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];
- public GetEnumeratorStatement (IteratorHost host, Expression type)
- {
- this.host = host;
- this.type = type;
- loc = host.Location;
- }
+ FieldExpr from = new FieldExpr (hp_cp.Field, loc);
+ from.InstanceExpression = CompilerGeneratedThis.Instance;
- public override bool Resolve (EmitContext ec)
- {
- type = type.ResolveAsTypeTerminal (ec, false);
- if ((type == null) || (type.Type == null))
- return false;
+ init.Add (new ElementInitializer (hp.Field.Name, from, loc));
+ }
+ }
- initializer = host.GetEnumeratorInitializer (ec);
- if (initializer == null)
- return false;
+ if (init != null) {
+ new_storey = new NewInitialize (storey_type_expr, null,
+ new CollectionOrObjectInitializers (init, loc), loc);
+ } else {
+ new_storey = new New (storey_type_expr, null, loc);
+ }
- cast = new ClassCast (initializer, type.Type);
+ new_storey = new_storey.Resolve (ec);
+ if (new_storey != null)
+ new_storey = Convert.ImplicitConversionRequired (ec, new_storey, host_method.MemberType, loc);
if (TypeManager.int_interlocked_compare_exchange == null) {
- Type t = TypeManager.CoreLookupType ("System.Threading", "Interlocked", Kind.Class, true);
+ Type t = TypeManager.CoreLookupType (ec.Compiler, "System.Threading", "Interlocked", Kind.Class, true);
if (t != null) {
TypeManager.int_interlocked_compare_exchange = TypeManager.GetPredefinedMethod (
- t, "CompareExchange", loc, TypeManager.GetReferenceType (TypeManager.int32_type),
+ t, "CompareExchange", loc, TypeManager.int32_type,
TypeManager.int32_type, TypeManager.int32_type);
}
}
- ce = TypeManager.int_interlocked_compare_exchange;
-
ec.CurrentBranching.CurrentUsageVector.Goto ();
return true;
}
Label label_init = ig.DefineLabel ();
ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldflda, host.PC.FieldBuilder);
- ig.Emit (OpCodes.Ldc_I4, (int) Iterator.State.Start);
- ig.Emit (OpCodes.Ldc_I4, (int) Iterator.State.Uninitialized);
- ig.Emit (OpCodes.Call, ce);
+ ig.Emit (OpCodes.Ldflda, host.PC.Spec.MetaInfo);
+ IntConstant.EmitInt (ig, (int) Iterator.State.Start);
+ IntConstant.EmitInt (ig, (int) Iterator.State.Uninitialized);
+ ig.Emit (OpCodes.Call, TypeManager.int_interlocked_compare_exchange);
- ig.Emit (OpCodes.Ldc_I4, (int) Iterator.State.Uninitialized);
- ig.Emit (OpCodes.Bne_Un, label_init);
+ IntConstant.EmitInt (ig, (int) Iterator.State.Uninitialized);
+ ig.Emit (OpCodes.Bne_Un_S, label_init);
ig.Emit (OpCodes.Ldarg_0);
ig.Emit (OpCodes.Ret);
ig.MarkLabel (label_init);
- initializer.EmitStatement (ec);
- cast.Emit (ec);
+ new_storey.Emit (ec);
ig.Emit (OpCodes.Ret);
}
- }
- }
-
- protected class DisposeMethod : Method
- {
- public IteratorHost Host;
- public DisposeMethod (IteratorHost host)
- : base (host, null, TypeManager.system_void_expr, Modifiers.PUBLIC,
- false, new MemberName ("Dispose", host.Location),
- Parameters.EmptyReadOnlyParameters, null)
- {
- this.Host = host;
-
- host.AddMethod (this);
-
- Block = new ToplevelBlock (host.Iterator.Block, null, Location);
- Block.AddStatement (new DisposeMethodStatement (Host.Iterator));
-
- Report.Debug (64, "DISPOSE METHOD", host, Block);
+ public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
+ {
+ throw new NotSupportedException ();
+ }
}
- public override EmitContext CreateEmitContext (DeclSpace tc, ILGenerator ig)
+ public GetEnumeratorMethod (IteratorStorey host, FullNamedExpression returnType, MemberName name)
+ : base (host, returnType, 0, name)
{
- EmitContext ec = new EmitContext (
- this, tc, this.ds, Location, ig, MemberType, ModFlags, false);
-
- ec.CurrentAnonymousMethod = Host.Iterator;
- return ec;
+ Block.AddStatement (new GetEnumeratorStatement (host, this));
}
+ }
- protected class DisposeMethodStatement : Statement
+ class DisposeMethod : IteratorMethod
+ {
+ sealed class DisposeMethodStatement : Statement
{
Iterator iterator;
this.loc = iterator.Location;
}
- public override bool Resolve (EmitContext ec)
+ protected override void CloneTo (CloneContext clonectx, Statement target)
+ {
+ throw new NotSupportedException ();
+ }
+
+ public override bool Resolve (BlockContext ec)
{
return true;
}
{
iterator.EmitDispose (ec);
}
+
+ public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
+ {
+ throw new NotSupportedException ();
+ }
}
- }
- protected ScopeInitializer GetEnumeratorInitializer (EmitContext ec)
- {
- ScopeInitializer init = new EnumeratorScopeInitializer (this);
- if (init.Resolve (ec) == null)
- throw new InternalErrorException ();
- return init;
+ public DisposeMethod (IteratorStorey host)
+ : base (host, TypeManager.system_void_expr, Modifiers.PUBLIC, new MemberName ("Dispose", host.Location))
+ {
+ host.AddMethod (this);
+
+ Block = new ToplevelBlock (Compiler, host.Iterator.Container, ParametersCompiled.EmptyReadOnlyParameters, Location);
+ Block.AddStatement (new DisposeMethodStatement (host.Iterator));
+ }
}
- protected class EnumeratorScopeInitializer : IteratorHostInitializer
+ //
+ // Uses Method as method info
+ //
+ class DynamicMethodGroupExpr : MethodGroupExpr
{
- IteratorHost host;
+ readonly Method method;
- public EnumeratorScopeInitializer (IteratorHost host)
- : base (host)
+ public DynamicMethodGroupExpr (Method method, Location loc)
+ : base (null, loc)
{
- this.host = host;
+ this.method = method;
+ eclass = ExprClass.Unresolved;
}
- protected override bool DoResolveInternal (EmitContext ec)
+ protected override Expression DoResolve (ResolveContext ec)
{
- type = host.IsGeneric ? host.CurrentType : host.TypeBuilder;
- return base.DoResolveInternal (ec);
+ Methods = new MethodBase [] { method.MethodBuilder };
+ type = method.Parent.TypeBuilder;
+ InstanceExpression = new CompilerGeneratedThis (type, Location);
+ return base.DoResolve (ec);
}
+ }
- protected override void DoEmit (EmitContext ec)
- {
- DoEmitInstance (ec);
- }
+ class DynamicFieldExpr : FieldExpr
+ {
+ readonly Field field;
- protected override bool IsGetEnumerator {
- get { return true; }
+ public DynamicFieldExpr (Field field, Location loc)
+ : base (loc)
+ {
+ this.field = field;
}
- protected override void EmitParameterReference (EmitContext ec,
- CapturedParameter cp)
+ protected override Expression DoResolve (ResolveContext ec)
{
- ec.ig.Emit (OpCodes.Ldarg_0);
- ec.ig.Emit (OpCodes.Ldfld, cp.Field.FieldBuilder);
+ spec = field.Spec;
+ type = TypeManager.TypeToCoreType (spec.FieldType);
+ InstanceExpression = new CompilerGeneratedThis (type, Location);
+ return base.DoResolve (ec);
}
}
- protected class CurrentBlock : Statement {
- IteratorHost host;
- bool is_generic;
+ public readonly Iterator Iterator;
- public CurrentBlock (IteratorHost host, bool is_generic)
- {
- this.host = host;
- this.is_generic = is_generic;
- loc = host.Location;
+ TypeExpr iterator_type_expr;
+ Field pc_field;
+ Field current_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;
+
+ public IteratorStorey (Iterator iterator)
+ : base (iterator.Container.Toplevel, iterator.Host,
+ iterator.OriginalMethod as MemberBase, iterator.GenericMethod, "Iterator")
+ {
+ this.Iterator = iterator;
+ }
+
+ public Field PC {
+ get { return pc_field; }
+ }
+
+ public Field CurrentField {
+ get { return current_field; }
+ }
+
+ public IList<HoistedParameter> HoistedParameters {
+ get { return hoisted_params; }
+ }
+
+ protected override TypeExpr [] ResolveBaseTypes (out TypeExpr base_class)
+ {
+ iterator_type_expr = new TypeExpression (MutateType (Iterator.OriginalIteratorType), Location);
+ generic_args = new TypeArguments (iterator_type_expr);
+
+ var list = new List<FullNamedExpression> ();
+ if (Iterator.IsEnumerable) {
+ enumerable_type = new TypeExpression (
+ TypeManager.ienumerable_type, Location);
+ list.Add (enumerable_type);
+
+ if (TypeManager.generic_ienumerable_type != null) {
+ generic_enumerable_type = new GenericTypeExpr (
+ TypeManager.generic_ienumerable_type,
+ generic_args, Location);
+ list.Add (generic_enumerable_type);
+ }
}
- public override bool Resolve (EmitContext ec)
- {
- if (TypeManager.invalid_operation_exception_ctor == null) {
- Type t = TypeManager.CoreLookupType ("System", "InvalidOperationException", Kind.Class, true);
- if (t != null)
- TypeManager.invalid_operation_exception_ctor = TypeManager.GetPredefinedConstructor (t, loc, Type.EmptyTypes);
+ enumerator_type = new TypeExpression (
+ TypeManager.ienumerator_type, Location);
+ list.Add (enumerator_type);
+
+ list.Add (new TypeExpression (TypeManager.idisposable_type, Location));
+
+ if (TypeManager.generic_ienumerator_type != null) {
+ generic_enumerator_type = new GenericTypeExpr (
+ TypeManager.generic_ienumerator_type,
+ generic_args, Location);
+ list.Add (generic_enumerator_type);
+ }
+
+ type_bases = list;
+
+ return base.ResolveBaseTypes (out base_class);
+ }
+
+ protected override string GetVariableMangledName (LocalInfo local_info)
+ {
+ return "<" + local_info.Name + ">__" + local_name_idx++.ToString ();
+ }
+
+ public void DefineIteratorMembers ()
+ {
+ pc_field = AddCompilerGeneratedField ("$PC", TypeManager.system_int32_expr);
+ current_field = AddCompilerGeneratedField ("$current", iterator_type_expr);
+
+ if (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));
}
+ }
- ec.CurrentBranching.CurrentUsageVector.Goto ();
- return true;
+ if (generic_enumerator_type != null)
+ Define_Current (true);
+
+ Define_Current (false);
+ new DisposeMethod (this);
+ 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);
+
+ 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);
+
+ //
+ // Just call generic GetEnumerator implementation
+ //
+ get_enumerator.Block.AddStatement (
+ new Return (new Invocation (new DynamicMethodGroupExpr (gget_enumerator, Location), null), Location));
+
+ AddMethod (get_enumerator);
+ AddMethod (gget_enumerator);
+ } else {
+ AddMethod (new GetEnumeratorMethod (this, enumerator_type, name));
+ }
}
+ }
- protected override void DoEmit (EmitContext ec)
- {
- ILGenerator ig = ec.ig;
- Label label_ok = ig.DefineLabel ();
+ protected override void EmitHoistedParameters (EmitContext ec, IList<HoistedParameter> hoisted)
+ {
+ base.EmitHoistedParameters (ec, hoisted);
+ base.EmitHoistedParameters (ec, hoisted_params_copy);
+ }
- ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldfld, host.PC.FieldBuilder);
- ig.Emit (OpCodes.Ldc_I4, (int) Iterator.State.Start);
- ig.Emit (OpCodes.Bgt, label_ok);
+ void Define_Current (bool is_generic)
+ {
+ TypeExpr type;
- ig.Emit (OpCodes.Newobj, TypeManager.invalid_operation_exception_ctor);
- ig.Emit (OpCodes.Throw);
+ MemberName name = new MemberName (QualifiedAliasMember.GlobalAlias, "System", null, Location);
+ name = new MemberName (name, "Collections", Location);
- ig.MarkLabel (label_ok);
- ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldfld, host.CurrentField.FieldBuilder);
- if (!is_generic)
- ig.Emit (OpCodes.Box, host.CurrentField.MemberType);
- ig.Emit (OpCodes.Ret);
+ if (is_generic) {
+ name = new MemberName (name, "Generic", Location);
+ name = new MemberName (name, "IEnumerator", generic_args, Location);
+ type = iterator_type_expr;
+ } else {
+ name = new MemberName (name, "IEnumerator");
+ type = TypeManager.system_object_expr;
}
+
+ name = new MemberName (name, "Current", Location);
+
+ ToplevelBlock get_block = new ToplevelBlock (Compiler, Location);
+ get_block.AddStatement (new Return (new DynamicFieldExpr (CurrentField, Location), Location));
+
+ Accessor getter = new Accessor (get_block, 0, null, null, Location);
+
+ Property current = new Property (
+ this, type, Modifiers.DEBUGGER_HIDDEN, name, null, getter, null, false);
+ AddProperty (current);
}
- }
- public class Iterator : AnonymousContainer {
- protected readonly ToplevelBlock OriginalBlock;
- protected readonly IMethodData OriginalMethod;
- protected ToplevelBlock block;
+ void Define_Reset ()
+ {
+ Method reset = new Method (
+ this, null, TypeManager.system_void_expr,
+ Modifiers.PUBLIC | Modifiers.DEBUGGER_HIDDEN,
+ new MemberName ("Reset", Location),
+ ParametersCompiled.EmptyReadOnlyParameters, null);
+ AddMethod (reset);
+ reset.Block = new ToplevelBlock (Compiler, Location);
+
+ Type ex_type = TypeManager.CoreLookupType (Compiler, "System", "NotSupportedException", Kind.Class, true);
+ if (ex_type == null)
+ return;
+
+ reset.Block.AddStatement (new Throw (new New (new TypeExpression (ex_type, Location), null, Location), Location));
+ }
+ }
+
+ //
+ // Iterators are implemented as hidden anonymous block
+ //
+ public class Iterator : AnonymousExpression {
+ public readonly IMethodData OriginalMethod;
+ AnonymousMethodMethod method;
+ public readonly TypeContainer Host;
public readonly bool IsEnumerable;
- public readonly bool IsStatic;
+ List<ResumableStatement> resume_points;
//
// The state as we generate the iterator
get { return current_pc; }
}
+ public Block Container {
+ get { return OriginalMethod.Block; }
+ }
+
+ public GenericMethod GenericMethod {
+ get { return OriginalMethod.GenericMethod; }
+ }
+
public readonly Type OriginalIteratorType;
- public readonly IteratorHost IteratorHost;
+
+ readonly IteratorStorey IteratorHost;
public enum State {
Running = -3, // Used only in CurrentPC, never stored into $PC
ILGenerator ig = ec.ig;
ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec.MetaInfo);
ig.Emit (OpCodes.Ldarg_0);
IntConstant.EmitInt (ig, (int) State.After);
- ig.Emit (OpCodes.Stfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Stfld, IteratorHost.PC.Spec.MetaInfo);
// We only care if the PC is zero (start executing) or non-zero (don't do anything)
ig.Emit (OpCodes.Brtrue, move_next_error);
current_pc = ec.GetTemporaryLocal (TypeManager.uint32_type);
ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec.MetaInfo);
ig.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
ig.Emit (OpCodes.Ldarg_0);
IntConstant.EmitInt (ig, (int) State.After);
- ig.Emit (OpCodes.Stfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Stfld, IteratorHost.PC.Spec.MetaInfo);
Label [] labels = new Label [1 + resume_points.Count];
labels [0] = ig.DefineLabel ();
bool need_skip_finally = false;
for (int i = 0; i < resume_points.Count; ++i) {
- ResumableStatement s = (ResumableStatement) resume_points [i];
+ ResumableStatement s = resume_points [i];
need_skip_finally |= s is ExceptionStatement;
labels [i+1] = s.PrepareForEmit (ec);
}
ig.Emit (OpCodes.Stloc, skip_finally);
}
- ig.BeginExceptionBlock ();
-
SymbolWriter.StartIteratorDispatcher (ec.ig);
ig.Emit (OpCodes.Ldloc, current_pc);
ig.Emit (OpCodes.Switch, labels);
ig.Emit (OpCodes.Ldarg_0);
IntConstant.EmitInt (ig, (int) State.After);
- ig.Emit (OpCodes.Stfld, IteratorHost.PC.FieldBuilder);
-
- Label end = ig.DefineLabel ();
- LocalBuilder retval = ec.GetTemporaryLocal (TypeManager.int32_type);
+ ig.Emit (OpCodes.Stfld, IteratorHost.PC.Spec.MetaInfo);
ig.MarkLabel (move_next_error);
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Stloc, retval);
- ig.Emit (OpCodes.Leave_S, end);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Ret);
ig.MarkLabel (move_next_ok);
ig.Emit (OpCodes.Ldc_I4_1);
- ig.Emit (OpCodes.Stloc, retval);
- //ig.Emit (OpCodes.Leave_S, end); // SRE automatically emits a Leave on the BeginFaultBlock
+ ig.Emit (OpCodes.Ret);
SymbolWriter.EndIteratorDispatcher (ec.ig);
-
- ig.BeginFaultBlock ();
-
- ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Callvirt, IteratorHost.Dispose);
-
- ig.EndExceptionBlock ();
-
- ig.MarkLabel (end);
- ig.Emit (OpCodes.Ldloc, retval);
- ig.Emit (OpCodes.Ret);
}
public void EmitDispose (EmitContext ec)
if (labels != null) {
current_pc = ec.GetTemporaryLocal (TypeManager.uint32_type);
ig.Emit (OpCodes.Ldarg_0);
- ig.Emit (OpCodes.Ldfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec.MetaInfo);
ig.Emit (OpCodes.Stloc, current_pc);
}
ig.Emit (OpCodes.Ldarg_0);
IntConstant.EmitInt (ig, (int) State.After);
- ig.Emit (OpCodes.Stfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Stfld, IteratorHost.PC.Spec.MetaInfo);
if (labels != null) {
//SymbolWriter.StartIteratorDispatcher (ec.ig);
ig.MarkLabel (end);
}
- ArrayList resume_points;
- public int AddResumePoint (ResumableStatement stmt, Location loc)
+ public int AddResumePoint (ResumableStatement stmt)
{
if (resume_points == null)
- resume_points = new ArrayList ();
+ resume_points = new List<ResumableStatement> ();
+
resume_points.Add (stmt);
return resume_points.Count;
}
// Store the new current
ig.Emit (OpCodes.Ldarg_0);
expr.Emit (ec);
- ig.Emit (OpCodes.Stfld, IteratorHost.CurrentField.FieldBuilder);
+ ig.Emit (OpCodes.Stfld, IteratorHost.CurrentField.Spec.MetaInfo);
// store resume program-counter
ig.Emit (OpCodes.Ldarg_0);
IntConstant.EmitInt (ig, resume_pc);
- ig.Emit (OpCodes.Stfld, IteratorHost.PC.FieldBuilder);
+ ig.Emit (OpCodes.Stfld, IteratorHost.PC.Spec.MetaInfo);
// mark finally blocks as disabled
if (unwind_protect && skip_finally != null) {
get { return true; }
}
- public override RootScopeInfo RootScope {
- get { return IteratorHost; }
- }
-
- public override ScopeInfo Scope {
+ public override AnonymousMethodStorey Storey {
get { return IteratorHost; }
}
//
// Our constructor
//
- private Iterator (IMethodData m_container, DeclSpace host, GenericMethod generic,
- int modifiers, Type iterator_type, bool is_enumerable)
- : base (host, generic, m_container.ParameterInfo,
- new ToplevelBlock (m_container.ParameterInfo, m_container.Location),
- m_container.Block, TypeManager.bool_type, modifiers,
- m_container.Location)
+ private Iterator (CompilerContext ctx, IMethodData method, TypeContainer host, Type iterator_type, bool is_enumerable)
+ : base (
+ new ToplevelBlock (ctx, method.Block, ParametersCompiled.EmptyReadOnlyParameters, method.Block.StartLocation),
+ TypeManager.bool_type,
+ method.Location)
{
- this.OriginalBlock = m_container.Block;
- this.OriginalMethod = m_container;
+ this.OriginalMethod = method;
this.OriginalIteratorType = iterator_type;
this.IsEnumerable = is_enumerable;
+ this.Host = host;
+ this.type = method.ReturnType;
- Report.Debug (64, "NEW ITERATOR", host, generic, OriginalBlock,
- Container, Block);
-
- IteratorHost = new IteratorHost (this);
- Block.CreateIteratorHost (IteratorHost);
-
- OriginalBlock.ReParent (Container.Toplevel);
-
- m_container.Block = Container.Toplevel;
-
- OriginalBlock.MakeIterator (this);
- }
-
- protected class TestStatement : Statement
- {
- public override bool Resolve (EmitContext ec)
- {
- return true;
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- ec.ig.Emit (OpCodes.Nop);
- ec.ig.Emit (OpCodes.Neg);
- ec.ig.Emit (OpCodes.Pop);
- ec.ig.Emit (OpCodes.Ret);
- }
+ IteratorHost = Block.ChangeToIterator (this, method.Block);
}
public override string GetSignatureForError ()
return OriginalMethod.GetSignatureForError ();
}
- public override bool Define (EmitContext ec)
+ protected override Expression DoResolve (ResolveContext ec)
{
- Report.Debug (64, "RESOLVE ITERATOR", this, Container, Block);
-
- Parameters parameters = OriginalMethod.ParameterInfo;
- for (int i = 0; i < parameters.Count; i++){
- Parameter.Modifier mod = parameters.ParameterModifier (i);
- if ((mod & (Parameter.Modifier.REF | Parameter.Modifier.OUT)) != 0){
- Report.Error (1623, Location,
- "Iterators cannot have ref or out parameters");
- return false;
- }
-
- if ((mod & Parameter.Modifier.ARGLIST) != 0) {
- Report.Error (1636, Location,
- "__arglist is not allowed in parameter list " +
- "of iterators");
- return false;
- }
-
- if (parameters.ParameterType (i).IsPointer) {
- Report.Error (1637, Location,
- "Iterators cannot have unsafe parameters or " +
- "yield types");
- return false;
- }
- }
-
- if ((ModFlags & Modifiers.UNSAFE) != 0) {
- Report.Error (1629, Location, "Unsafe code may not appear in iterators");
- return false;
- }
-
- if (!base.Define (ec))
- return false;
-
- Report.Debug (64, "RESOLVE ITERATOR #1", this, method, method.Parent,
- RootScope, ec);
+ method = new AnonymousMethodMethod (Storey,
+ this, Storey, null, TypeManager.system_boolean_expr,
+ Modifiers.PUBLIC, OriginalMethod.GetSignatureForError (),
+ new MemberName ("MoveNext", Location),
+ ParametersCompiled.EmptyReadOnlyParameters);
- if (!RootScope.ResolveType ())
- return false;
- if (!RootScope.ResolveMembers ())
- return false;
- if (!RootScope.DefineMembers ())
- return false;
+ if (Compatible (ec) == null)
+ return null;
- ExpressionStatement scope_init = RootScope.GetScopeInitializer (ec);
- Container.AddStatement (new StatementExpression (scope_init));
- Expression cast = new ClassCast (scope_init, OriginalMethod.ReturnType);
- Container.AddStatement (new NoCheckReturn (cast));
+ IteratorHost.DefineIteratorMembers ();
- return true;
+ eclass = ExprClass.Value;
+ return this;
}
- protected override Method DoCreateMethodHost (EmitContext ec)
+ public override void Emit (EmitContext ec)
{
- Report.Debug (128, "CREATE METHOD HOST", this, IteratorHost);
+ //
+ // Load Iterator storey instance
+ //
+ method.Storey.Instance.Emit (ec);
- MemberCore mc = ec.ResolveContext as MemberCore;
+ //
+ // Initialize iterator PC when it's unitialized
+ //
+ if (IsEnumerable) {
+ ILGenerator ig = ec.ig;
+ ig.Emit (OpCodes.Dup);
+ IntConstant.EmitInt (ig, (int)State.Uninitialized);
- IteratorHost.CaptureScopes ();
+ FieldInfo field = IteratorHost.PC.Spec.MetaInfo;
+ if (Storey.MemberName.IsGeneric)
+ field = TypeBuilder.GetField (Storey.Instance.Type, field);
- return new AnonymousMethodMethod (
- this, RootScope, null, TypeManager.system_boolean_expr,
- Modifiers.PUBLIC, mc.GetSignatureForError (),
- new MemberName ("MoveNext", Location),
- Parameters.EmptyReadOnlyParameters);
+ ig.Emit (OpCodes.Stfld, field);
+ }
}
- public override Expression DoResolve (EmitContext ec)
+ public override Expression CreateExpressionTree (ResolveContext ec)
{
- throw new NotSupportedException ();
- }
-
- public Type IteratorType {
- get { return IteratorHost.IteratorType; }
+ throw new NotSupportedException ("ET");
}
- //
- // This return statement tricks return into not flagging an error for being
- // used in a Yields method
- //
- class NoCheckReturn : Statement {
- public Expression Expr;
-
- public NoCheckReturn (Expression expr)
- {
- Expr = expr;
- loc = expr.Location;
- }
-
- public override bool Resolve (EmitContext ec)
- {
- Expr = Expr.Resolve (ec);
- if (Expr == null)
- return false;
-
- ec.CurrentBranching.CurrentUsageVector.Goto ();
-
- return true;
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- Expr.Emit (ec);
- ec.ig.Emit (OpCodes.Ret);
- }
- }
-
- public static Iterator CreateIterator (IMethodData method, DeclSpace parent,
- GenericMethod generic, int modifiers)
+ public static void CreateIterator (IMethodData method, TypeContainer parent, Modifiers modifiers, CompilerContext ctx)
{
bool is_enumerable;
Type iterator_type;
Type ret = method.ReturnType;
if (ret == null)
- return null;
+ return;
if (!CheckType (ret, out iterator_type, out is_enumerable)) {
- Report.Error (1624, method.Location,
+ ctx.Report.Error (1624, method.Location,
"The body of `{0}' cannot be an iterator block " +
"because `{1}' is not an iterator interface type",
method.GetSignatureForError (),
TypeManager.CSharpName (ret));
- return null;
+ return;
}
- return new Iterator (method, parent, generic, modifiers,
- iterator_type, is_enumerable);
+ ParametersCompiled parameters = method.ParameterInfo;
+ for (int i = 0; i < parameters.Count; i++) {
+ Parameter p = parameters [i];
+ Parameter.Modifier mod = p.ModFlags;
+ if ((mod & Parameter.Modifier.ISBYREF) != 0) {
+ ctx.Report.Error (1623, p.Location,
+ "Iterators cannot have ref or out parameters");
+ return;
+ }
+
+ if (p is ArglistParameter) {
+ ctx.Report.Error (1636, method.Location,
+ "__arglist is not allowed in parameter list of iterators");
+ return;
+ }
+
+ if (parameters.Types [i].IsPointer) {
+ ctx.Report.Error (1637, p.Location,
+ "Iterators cannot have unsafe parameters or " +
+ "yield types");
+ return;
+ }
+ }
+
+ if ((modifiers & Modifiers.UNSAFE) != 0) {
+ ctx.Report.Error (1629, method.Location, "Unsafe code may not appear in iterators");
+ return;
+ }
+
+ Iterator iter = new Iterator (ctx, method, parent, iterator_type, is_enumerable);
+ iter.Storey.DefineType ();
}
static bool CheckType (Type ret, out Type original_iterator_type, out bool is_enumerable)
return true;
}
-#if GMCS_SOURCE
- if (!ret.IsGenericType)
+ if (!TypeManager.IsGenericType (ret))
return false;
Type[] args = TypeManager.GetTypeArguments (ret);
if (args.Length != 1)
return false;
- Type gt = ret.GetGenericTypeDefinition ();
+ Type gt = TypeManager.DropGenericTypeArguments (ret);
if (gt == TypeManager.generic_ienumerable_type) {
- original_iterator_type = args [0];
+ original_iterator_type = TypeManager.TypeToCoreType (args [0]);
is_enumerable = true;
return true;
- } else if (gt == TypeManager.generic_ienumerator_type) {
- original_iterator_type = args [0];
+ }
+
+ if (gt == TypeManager.generic_ienumerator_type) {
+ original_iterator_type = TypeManager.TypeToCoreType (args [0]);
is_enumerable = false;
return true;
}
-#endif
return false;
}
projects / mono.git / blobdiff