//
// TODO:
// Flow analysis for Yield.
-// Emit calls to parent object constructor.
+// Emit calls to base object constructor.
//
// Generics note:
// Current should be defined to return T, and IEnumerator.Current returns object
}
public class Yield : Statement {
- public Expression expr;
- bool in_exc;
-
+ Expression expr;
+ ArrayList finally_blocks;
+
public Yield (Expression expr, Location l)
{
this.expr = expr;
public static bool CheckContext (EmitContext ec, Location loc)
{
- if (ec.CurrentBranching.InFinally (true)){
+ if (ec.InFinally) {
Report.Error (1625, loc, "Cannot yield in the body of a " +
"finally clause");
return false;
+ }
+
+ if (ec.InUnsafe) {
+ Report.Error (1629, loc, "Unsafe code may not appear in iterators");
+ return false;
}
- if (ec.CurrentBranching.InCatch ()){
- Report.Error (1631, loc, "Cannot yield in the body of a " +
- "catch clause");
+ if (ec.InCatch){
+ Report.Error (1631, loc, "Cannot yield a value in the body of a catch clause");
return false;
}
- if (ec.InAnonymousMethod){
- Report.Error (1621, loc, "yield statement can not appear " +
- "inside an anonymoud method");
+
+ AnonymousContainer am = ec.CurrentAnonymousMethod;
+ if ((am != null) && !am.IsIterator){
+ Report.Error (1621, loc, "The yield statement cannot be used inside anonymous method blocks");
return false;
}
- //
- // FIXME: Missing check for Yield inside try block that contains catch clauses
- //
+ if (ec.CurrentBranching.InTryWithCatch ()) {
+ Report.Error (1626, loc, "Cannot yield a value in the body of a " +
+ "try block with a catch clause");
+ return false;
+ }
return true;
}
expr = expr.Resolve (ec);
if (expr == null)
return false;
+
if (!CheckContext (ec, loc))
return false;
- in_exc = ec.CurrentBranching.InTryOrCatch (false);
- Type iterator_type = ec.CurrentIterator.IteratorType;
- if (expr.Type != iterator_type){
- expr = Convert.ImplicitConversionRequired (ec, expr, iterator_type, loc);
+ Iterator iterator = ec.CurrentIterator;
+
+ if (expr.Type != iterator.IteratorType){
+ expr = Convert.ImplicitConversionRequired (
+ ec, expr, iterator.IteratorType, loc);
if (expr == null)
return false;
}
+
+ ec.CurrentBranching.StealFinallyClauses (ref finally_blocks);
return true;
}
protected override void DoEmit (EmitContext ec)
{
- ec.CurrentIterator.MarkYield (ec, expr, in_exc);
+ ec.CurrentIterator.MarkYield (ec, expr, finally_blocks);
}
}
protected override void DoEmit (EmitContext ec)
{
- ec.CurrentIterator.EmitYieldBreak (ec.ig, true);
+ ec.CurrentIterator.EmitYieldBreak (ec.ig);
}
}
public class Iterator : Class {
- Block original_block;
- Block block;
+ protected ToplevelBlock original_block;
+ protected ToplevelBlock block;
- Type iterator_type;
+ Type original_iterator_type;
TypeExpr iterator_type_expr;
bool is_enumerable;
- bool is_static;
+ public readonly bool IsStatic;
//
// The state as we generate the iterator
//
- ArrayList resume_labels = new ArrayList ();
+ Label move_next_ok, move_next_error;
+ ArrayList resume_points = new ArrayList ();
int pc;
//
// Context from the original method
//
+ GenericMethod generic_method;
TypeContainer container;
- Type return_type;
- Type [] param_types;
+ TypeExpr current_type;
+ Type this_type;
InternalParameters parameters;
+ InternalParameters original_parameters;
+ IMethodData orig_method;
+
+ MethodInfo dispose_method;
+ MoveNextMethod move_next_method;
+ Constructor ctor;
+ CaptureContext cc;
Expression enumerator_type;
Expression enumerable_type;
Expression generic_enumerable_type;
TypeArguments generic_args;
+ protected enum State {
+ Uninitialized = -2,
+ After,
+ Running
+ }
+
static int proxy_count;
- public void EmitYieldBreak (ILGenerator ig, bool add_return)
+ public void EmitYieldBreak (ILGenerator ig)
{
ig.Emit (OpCodes.Ldarg_0);
- IntConstant.EmitInt (ig, -1);
+ IntConstant.EmitInt (ig, (int) State.After);
ig.Emit (OpCodes.Stfld, pc_field.FieldBuilder);
- if (add_return){
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Ret);
- }
+ ig.Emit (OpCodes.Br, move_next_error);
}
public void EmitMoveNext (EmitContext ec)
{
ILGenerator ig = ec.ig;
+ move_next_ok = ig.DefineLabel ();
+ move_next_error = ig.DefineLabel ();
+
+ LocalBuilder retval = ec.GetTemporaryLocal (TypeManager.int32_type);
+
+ ig.BeginExceptionBlock ();
+
Label dispatcher = ig.DefineLabel ();
ig.Emit (OpCodes.Br, dispatcher);
- Label entry_point = ig.DefineLabel ();
- ig.MarkLabel (entry_point);
- resume_labels.Add (entry_point);
- ec.EmitTopBlock (original_block, parameters, Location);
+ ResumePoint entry_point = new ResumePoint (null);
+ resume_points.Add (entry_point);
+ entry_point.Define (ig);
+
+ ec.EmitTopBlock (orig_method, original_block, parameters);
- EmitYieldBreak (ig, true);
+ EmitYieldBreak (ig);
- //
- // FIXME: Split the switch in blocks that can be consumed
- // by switch.
- //
ig.MarkLabel (dispatcher);
- Label [] labels = new Label [resume_labels.Count];
- resume_labels.CopyTo (labels);
+ Label [] labels = new Label [resume_points.Count];
+ for (int i = 0; i < labels.Length; i++)
+ labels [i] = ((ResumePoint) resume_points [i]).Label;
+
ig.Emit (OpCodes.Ldarg_0);
ig.Emit (OpCodes.Ldfld, pc_field.FieldBuilder);
ig.Emit (OpCodes.Switch, labels);
- ig.Emit (OpCodes.Ldc_I4_0);
+
+ Label end = ig.DefineLabel ();
+
+ ig.MarkLabel (move_next_error);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Stloc, retval);
+ ig.Emit (OpCodes.Leave, end);
+
+ ig.MarkLabel (move_next_ok);
+ ig.Emit (OpCodes.Ldc_I4_1);
+ ig.Emit (OpCodes.Stloc, retval);
+ ig.Emit (OpCodes.Leave, end);
+
+ ig.BeginFaultBlock ();
+
+ ig.Emit (OpCodes.Ldarg_0);
+ ig.Emit (OpCodes.Callvirt, dispose_method);
+
+ ig.EndExceptionBlock ();
+
+ ig.MarkLabel (end);
+ ig.Emit (OpCodes.Ldloc, retval);
ig.Emit (OpCodes.Ret);
}
- //
- // Invoked when a local variable declaration needs to be mapped to
- // a field in our proxy class
- //
- // Prefixes registered:
- // v_ for EmitContext.MapVariable
- // s_ for Storage
- //
- public FieldBuilder MapVariable (string pfx, string name, Type t)
+ public void EmitDispose (EmitContext ec)
{
- return TypeBuilder.DefineField (pfx + name, t, FieldAttributes.Public);
+ ILGenerator ig = ec.ig;
+
+ Label end = ig.DefineLabel ();
+ Label dispatcher = ig.DefineLabel ();
+ ig.Emit (OpCodes.Br, dispatcher);
+
+ Label [] labels = new Label [resume_points.Count];
+ for (int i = 0; i < labels.Length; i++) {
+ ResumePoint point = (ResumePoint) resume_points [i];
+
+ if (point.FinallyBlocks == null) {
+ labels [i] = end;
+ continue;
+ }
+
+ labels [i] = ig.DefineLabel ();
+ ig.MarkLabel (labels [i]);
+
+ ig.BeginExceptionBlock ();
+ ig.BeginFinallyBlock ();
+
+ foreach (ExceptionStatement stmt in point.FinallyBlocks) {
+ if (stmt != null)
+ stmt.EmitFinally (ec);
+ }
+
+ ig.EndExceptionBlock ();
+ ig.Emit (OpCodes.Br, end);
+ }
+
+ ig.MarkLabel (dispatcher);
+ ig.Emit (OpCodes.Ldarg_0);
+ ig.Emit (OpCodes.Ldfld, pc_field.FieldBuilder);
+ ig.Emit (OpCodes.Switch, labels);
+
+ ig.Emit (OpCodes.Ldarg_0);
+ IntConstant.EmitInt (ig, (int) State.After);
+ ig.Emit (OpCodes.Stfld, pc_field.FieldBuilder);
+
+ ig.MarkLabel (end);
}
-
+
+ protected class ResumePoint
+ {
+ public Label Label;
+ public readonly ExceptionStatement[] FinallyBlocks;
+
+ public ResumePoint (ArrayList list)
+ {
+ if (list != null) {
+ FinallyBlocks = new ExceptionStatement [list.Count];
+ list.CopyTo (FinallyBlocks, 0);
+ }
+ }
+
+ public void Define (ILGenerator ig)
+ {
+ Label = ig.DefineLabel ();
+ ig.MarkLabel (Label);
+ }
+ }
+
//
// Called back from Yield
//
- public void MarkYield (EmitContext ec, Expression expr, bool in_exc)
+ public void MarkYield (EmitContext ec, Expression expr,
+ ArrayList finally_blocks)
{
ILGenerator ig = ec.ig;
ig.Emit (OpCodes.Stfld, pc_field.FieldBuilder);
// Return ok
- ig.Emit (OpCodes.Ldc_I4_1);
-
- // Find out how to "leave"
- if (in_exc || !ec.IsLastStatement){
- Type old = ec.ReturnType;
- ec.ReturnType = TypeManager.int32_type;
- ig.Emit (OpCodes.Stloc, ec.TemporaryReturn ());
- ec.ReturnType = old;
- }
-
- if (in_exc){
- ec.NeedReturnLabel ();
- ig.Emit (OpCodes.Leave, ec.ReturnLabel);
- } else if (ec.IsLastStatement){
- ig.Emit (OpCodes.Ret);
- } else {
- ec.NeedReturnLabel ();
- ig.Emit (OpCodes.Br, ec.ReturnLabel);
- }
-
- Label resume_point = ig.DefineLabel ();
- ig.MarkLabel (resume_point);
- resume_labels.Add (resume_point);
+ ig.Emit (OpCodes.Br, move_next_ok);
+
+ ResumePoint point = new ResumePoint (finally_blocks);
+ resume_points.Add (point);
+ point.Define (ig);
+ }
+
+ public void MarkFinally (EmitContext ec, ArrayList finally_blocks)
+ {
+ ILGenerator ig = ec.ig;
+
+ // increment pc
+ pc++;
+ ig.Emit (OpCodes.Ldarg_0);
+ IntConstant.EmitInt (ig, pc);
+ ig.Emit (OpCodes.Stfld, pc_field.FieldBuilder);
+
+ ResumePoint point = new ResumePoint (finally_blocks);
+ resume_points.Add (point);
+ point.Define (ig);
}
- private static MemberName MakeProxyName (string name)
+ private static MemberName MakeProxyName (string name, GenericMethod generic, Location loc)
{
int pos = name.LastIndexOf ('.');
if (pos > 0)
name = name.Substring (pos + 1);
- return new MemberName ("<" + name + ">__" + (proxy_count++));
+ string proxy_name = "<" + name + ">__" + (proxy_count++);
+
+ if (generic != null) {
+ TypeArguments args = new TypeArguments (loc);
+ foreach (TypeParameter tparam in generic.CurrentTypeParameters)
+ args.Add (new SimpleName (tparam.Name, loc));
+ return new MemberName (proxy_name, args, loc);
+ } else
+ return new MemberName (proxy_name, loc);
}
//
// Our constructor
//
- public Iterator (TypeContainer container, string name, Type return_type,
- Type [] param_types, InternalParameters parameters,
- int modifiers, Block block, Location loc)
- : base (container.NamespaceEntry, container, MakeProxyName (name),
- Modifiers.PRIVATE, null, loc)
+ public Iterator (IMethodData m_container, TypeContainer container, GenericMethod generic,
+ InternalParameters parameters, int modifiers)
+ : base (container.NamespaceEntry, container,
+ MakeProxyName (m_container.MethodName.Name, generic, m_container.Location),
+ (modifiers & Modifiers.UNSAFE) | Modifiers.PRIVATE, null)
{
+ this.orig_method = m_container;
+
+ this.generic_method = generic;
this.container = container;
- this.return_type = return_type;
- this.param_types = param_types;
- this.parameters = parameters;
- this.original_block = block;
- this.block = new Block (null);
+ this.original_parameters = parameters;
+ this.original_block = orig_method.Block;
+ this.block = new ToplevelBlock (orig_method.Block, parameters.Parameters, orig_method.Location);
- is_static = (modifiers & Modifiers.STATIC) != 0;
+ if (generic != null) {
+ ArrayList constraints = new ArrayList ();
+ foreach (TypeParameter tparam in generic.TypeParameters)
+ constraints.Add (tparam.Constraints);
- container.AddIterator (this);
+ SetParameterInfo (constraints);
+ }
+
+ IsStatic = (modifiers & Modifiers.STATIC) != 0;
+ }
+
+ public AnonymousContainer Host {
+ get { return move_next_method; }
}
- public bool Define ()
+ public bool DefineIterator ()
{
- if (!CheckType (return_type)) {
- Report.Error (
- 1624, Location,
- "The body of `{0}' cannot be an iterator block " +
- "because '{1}' is not an iterator interface type",
- Name, TypeManager.CSharpName (return_type));
+ ec = new EmitContext (this, Location, null, null, ModFlags);
+ ec.CurrentAnonymousMethod = move_next_method;
+ ec.InIterator = true;
+
+ if (!CheckType ()) {
+ Report.Error (1624, Location,
+ "The body of `{0}' cannot be an iterator block because `{1}' is not an iterator interface type",
+ orig_method.GetSignatureForError (), TypeManager.CSharpName (orig_method.ReturnType));
return false;
}
- for (int i = 0; i < parameters.Count; i++){
- Parameter.Modifier mod = parameters.ParameterModifier (i);
+ for (int i = 0; i < original_parameters.Count; i++){
+ Parameter.Modifier mod = original_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 (original_parameters.ParameterType (i).IsPointer) {
+ Report.Error (1637, Location, "Iterators cannot have unsafe parameters or yield types");
+ return false;
+ }
+ }
+
+ if (container.CurrentType != null)
+ this_type = container.CurrentType;
+ else
+ this_type = container.TypeBuilder;
+
+ container.AddIterator (this);
+
+ orig_method.Block = block;
+ return true;
+ }
+
+ MethodInfo FetchMethodDispose ()
+ {
+ MemberList dispose_list;
+
+ dispose_list = FindMembers (
+ current_type.Type,
+ MemberTypes.Method, BindingFlags.Public | BindingFlags.Instance,
+ Type.FilterName, "Dispose");
+
+ if (dispose_list.Count != 1)
+ throw new InternalErrorException ("Cannot find Dipose() method.");
+
+ return (MethodInfo) dispose_list [0];
+ }
+
+ protected override bool DoDefineMembers ()
+ {
+ ec.InIterator = true;
+ ec.CurrentAnonymousMethod = move_next_method;
+ ec.capture_context = cc;
+
+ if (!base.DoDefineMembers ())
+ return false;
+
+ dispose_method = FetchMethodDispose ();
+ if (dispose_method == null)
+ return false;
+
+ return true;
+ }
+
+ public override bool Define ()
+ {
+ if (!base.Define ())
+ return false;
+
+ ec.InIterator = true;
+ ec.CurrentAnonymousMethod = move_next_method;
+ ec.capture_context = cc;
+
+ ec.TypeContainer = ec.TypeContainer.Parent;
+
+ if (ec.TypeContainer.CurrentType != null)
+ ec.ContainerType = ec.TypeContainer.CurrentType;
+ else
+ ec.ContainerType = ec.TypeContainer.TypeBuilder;
+
+ ec.ig = move_next_method.method.MethodBuilder.GetILGenerator ();
+
+ if (!ctor.Define ())
+ return false;
+
+ bool unreachable;
+
+ if (!ec.ResolveTopBlock (null, original_block, parameters, orig_method, out unreachable))
+ return false;
+
+ if (!ec.ResolveTopBlock (null, block, parameters, orig_method, out unreachable))
+ return false;
+
+ original_block.CompleteContexts ();
+
+ cc.EmitAnonymousHelperClasses (ec);
+
+ return true;
+ }
+
+ TypeExpr InflateType (Type it)
+ {
+ if (generic_method == null)
+ return new TypeExpression (it, Location);
+
+ if (it.IsGenericParameter && (it.DeclaringMethod != null)) {
+ int pos = it.GenericParameterPosition;
+ it = CurrentTypeParameters [pos].Type;
+ } else if (it.IsGenericInstance) {
+ Type[] args = it.GetGenericArguments ();
+
+ TypeArguments inflated = new TypeArguments (Location);
+ foreach (Type t in args)
+ inflated.Add (InflateType (t));
+
+ return new ConstructedType (it, inflated, Location);
+ } else if (it.IsArray) {
+ TypeExpr et_expr = InflateType (it.GetElementType ());
+ int rank = it.GetArrayRank ();
+
+ Type et = et_expr.ResolveAsTypeTerminal (ec).Type;
+ it = et.MakeArrayType (rank);
+ }
+
+ return new TypeExpression (it, Location);
+ }
+
+ Parameter InflateParameter (Parameter param)
+ {
+ TypeExpr te = InflateType (param.ParameterType);
+ return new Parameter (
+ te, param.Name, param.ModFlags, param.OptAttributes, param.Location);
+ }
+
+ InternalParameters InflateParameters (Parameters parameters, EmitContext ec)
+ {
+ Parameter[] fixed_params = null;
+ if (parameters.FixedParameters != null) {
+ fixed_params = new Parameter [parameters.FixedParameters.Length];
+ for (int i = 0; i < fixed_params.Length; i++)
+ fixed_params [i] = InflateParameter (parameters.FixedParameters [i]);
}
+ Parameters new_params;
+ if (parameters.ArrayParameter != null) {
+ Parameter array_param = InflateParameter (parameters.ArrayParameter);
+ new_params = new Parameters (fixed_params, array_param);
+ } else
+ new_params = new Parameters (fixed_params, parameters.HasArglist);
+
+ Type [] types = new_params.GetParameterInfo (ec);
+ return new InternalParameters (types, new_params);
+ }
+
+ protected override TypeExpr [] GetClassBases (out TypeExpr base_class)
+ {
+ iterator_type_expr = InflateType (original_iterator_type);
+
generic_args = new TypeArguments (Location);
- generic_args.Add (new TypeExpression (iterator_type, Location));
+ generic_args.Add (iterator_type_expr);
ArrayList list = new ArrayList ();
if (is_enumerable) {
generic_args, Location);
list.Add (generic_enumerator_type);
- iterator_type_expr = new TypeExpression (iterator_type, Location);
-
Bases = list;
- return true;
+
+ return base.GetClassBases (out base_class);
}
//
// Returns the new block for the method, or null on failure
//
- protected override bool DoDefineType ()
+ protected override bool DefineNestedTypes ()
{
+ if (CurrentType != null)
+ current_type = new TypeExpression (CurrentType, Location);
+ else
+ current_type = new TypeExpression (TypeBuilder, Location);
+
+ parameters = InflateParameters (original_parameters.Parameters, ec);
+
Define_Fields ();
- Define_Constructor ();
Define_Current (false);
Define_Current (true);
Define_MoveNext ();
Define_Reset ();
Define_Dispose ();
+ Define_Constructor ();
+
+ Create_Block ();
+
if (is_enumerable) {
Define_GetEnumerator (false);
Define_GetEnumerator (true);
}
- Create_Block ();
-
- return true;
+ return base.DefineNestedTypes ();
}
-
Field pc_field;
Field current_field;
- public Field this_field;
- public Field[] parameter_fields;
+ Method dispose;
void Create_Block ()
{
- int first = is_static ? 0 : 1;
+ original_block.SetHaveAnonymousMethods (Location, move_next_method);
+ block.SetHaveAnonymousMethods (Location, move_next_method);
+
+ cc = original_block.CaptureContext;
+
+ int first = IsStatic ? 0 : 1;
ArrayList args = new ArrayList ();
- if (!is_static) {
- Type t = container.TypeBuilder;
+ if (!IsStatic) {
+ Type t = this_type;
args.Add (new Argument (
- new SimpleParameterReference (t, 0, Location),
- Argument.AType.Expression));
+ new ThisParameterReference (t, Location)));
+ cc.CaptureThis (move_next_method);
}
+ args.Add (new Argument (new BoolLiteral (false, Location)));
+
for (int i = 0; i < parameters.Count; i++) {
- Type t = parameters.ParameterType (i);
+ Type t = original_parameters.ParameterType (i);
+ Type inflated = parameters.ParameterType (i);
+ string name = parameters.ParameterName (i);
+
args.Add (new Argument (
- new SimpleParameterReference (t, first + i, Location),
- Argument.AType.Expression));
+ new SimpleParameterReference (t, first + i, Location)));
+
+ cc.AddParameterToContext (move_next_method, name, inflated, first + i);
}
- Expression new_expr = new New (
- new TypeExpression (TypeBuilder, Location), args, Location);
+ TypeExpr proxy_type;
+ if (generic_method != null) {
+ TypeArguments new_args = new TypeArguments (Location);
+ if (Parent.IsGeneric) {
+ foreach (TypeParameter tparam in Parent.TypeParameters)
+ new_args.Add (new TypeParameterExpr (tparam, Location));
+ }
+ foreach (TypeParameter tparam in generic_method.TypeParameters)
+ new_args.Add (new TypeParameterExpr (tparam, Location));
+ ConstructedType ct = new ConstructedType (CurrentType, new_args, Location);
+ proxy_type = ct.ResolveAsTypeTerminal (ec);
+ } else
+ proxy_type = current_type;
+ Expression new_expr = new New (proxy_type, args, Location);
block.AddStatement (new NoCheckReturn (new_expr, Location));
}
void Define_Fields ()
{
- Location loc = Location.Null;
-
pc_field = new Field (
- TypeManager.system_int32_expr, Modifiers.PRIVATE, "PC",
- null, null, loc);
+ this, TypeManager.system_int32_expr, Modifiers.PRIVATE, "$PC",
+ null, null, Location);
AddField (pc_field);
current_field = new Field (
- iterator_type_expr, Modifiers.PRIVATE, "current",
- null, null, loc);
+ this, iterator_type_expr, Modifiers.PRIVATE, "$current",
+ null, null, Location);
AddField (current_field);
-
- if (!is_static) {
- this_field = new Field (
- new TypeExpression (container.TypeBuilder, Location),
- Modifiers.PRIVATE, "this", null, null, loc);
- AddField (this_field);
- }
-
- parameter_fields = new Field [parameters.Count];
- for (int i = 0; i < parameters.Count; i++) {
- string fname = String.Format (
- "field{0}_{1}", i, parameters.ParameterName (i));
-
- parameter_fields [i] = new Field (
- new TypeExpression (parameters.ParameterType (i), loc),
- Modifiers.PRIVATE, fname, null, null, loc);
- AddField (parameter_fields [i]);
- }
}
void Define_Constructor ()
{
Parameters ctor_params;
- if (!is_static) {
- Parameter this_param = new Parameter (
- new TypeExpression (container.TypeBuilder, Location),
- "this", Parameter.Modifier.NONE, null);
-
- Parameter[] old_fixed = parameters.Parameters.FixedParameters;
- Parameter[] fixed_params;
- if (old_fixed != null) {
- fixed_params = new Parameter [old_fixed.Length + 1];
- old_fixed.CopyTo (fixed_params, 1);
- } else {
- fixed_params = new Parameter [1];
- }
- fixed_params [0] = this_param;
+ ArrayList list = new ArrayList ();
- ctor_params = new Parameters (
- fixed_params, parameters.Parameters.ArrayParameter,
- Location);
- } else
- ctor_params = parameters.Parameters;
+ if (!IsStatic)
+ list.Add (new Parameter (
+ new TypeExpression (this_type, Location),
+ "this", Parameter.Modifier.NONE,
+ null, Location));
+ list.Add (new Parameter (
+ TypeManager.system_boolean_expr, "initialized",
+ Parameter.Modifier.NONE, null, Location));
- Constructor ctor = new Constructor (
- this, Name, Modifiers.PUBLIC, ctor_params,
- new ConstructorBaseInitializer (
- null, Parameters.EmptyReadOnlyParameters, Location),
- Location);
- AddConstructor (ctor);
+ Parameter[] old_fixed = parameters.Parameters.FixedParameters;
+ if (old_fixed != null)
+ list.AddRange (old_fixed);
- Block block = ctor.Block = new Block (null);
+ Parameter[] fixed_params = new Parameter [list.Count];
+ list.CopyTo (fixed_params);
- if (!is_static) {
- Type t = container.TypeBuilder;
+ ctor_params = new Parameters (fixed_params, parameters.Parameters.ArrayParameter);
- Assign assign = new Assign (
- new FieldExpression (this_field),
- new SimpleParameterReference (t, 1, Location),
- Location);
+ ctor = new Constructor (
+ this, MemberName.Name, Modifiers.PUBLIC, ctor_params,
+ new GeneratedBaseInitializer (Location),
+ Location);
+ AddConstructor (ctor);
- block.AddStatement (new StatementExpression (assign, Location));
- }
+ ctor.Block = new ToplevelBlock (block, parameters.Parameters, Location);
- int first = is_static ? 1 : 2;
+ int first = IsStatic ? 2 : 3;
- for (int i = 0; i < parameters.Count; i++) {
- Type t = parameters.ParameterType (i);
+ State initial = is_enumerable ? State.Uninitialized : State.Running;
+ ctor.Block.AddStatement (new SetState (this, initial, Location));
- Assign assign = new Assign (
- new FieldExpression (parameter_fields [i]),
- new SimpleParameterReference (t, first + i, Location),
- Location);
+ ctor.Block.AddStatement (new If (
+ new SimpleParameterReference (
+ TypeManager.bool_type, first - 1, Location),
+ new SetState (this, State.Running, Location),
+ Location));
- block.AddStatement (new StatementExpression (assign, Location));
- }
+ ctor.Block.AddStatement (new InitScope (this, Location));
}
Statement Create_ThrowInvalidOperation ()
if (is_generic) {
left = new MemberName (
"System.Collections.Generic.IEnumerator",
- generic_args);
+ generic_args, Location);
type = iterator_type_expr;
} else {
- left = new MemberName ("System.Collections.IEnumerator");
+ left = new MemberName ("System.Collections.IEnumerator", Location);
type = TypeManager.system_object_expr;
}
- MemberName name = new MemberName (left, "Current", null);
+ MemberName name = new MemberName (left, "Current", null, Location);
- Block get_block = new Block (null);
+ ToplevelBlock get_block = new ToplevelBlock (
+ block, parameters.Parameters, Location);
get_block.AddStatement (new If (
new Binary (
Binary.Operator.LessThanOrEqual,
- new FieldExpression (pc_field),
- new IntLiteral (0), Location),
+ new FieldExpression (this, pc_field),
+ new IntLiteral ((int) State.Running, pc_field.Location)),
Create_ThrowInvalidOperation (),
new Return (
- new FieldExpression (current_field), Location),
+ new FieldExpression (this, current_field), Location),
Location));
- Accessor getter = new Accessor (get_block, null);
+ Accessor getter = new Accessor (get_block, 0, null, Location);
Property current = new Property (
- this, type, 0, false, name, null, getter, null, Location);
+ this, type, 0, false, name, null, getter, null);
AddProperty (current);
}
void Define_MoveNext ()
{
- Method move_next = new Method (
- this, TypeManager.system_boolean_expr,
- Modifiers.PUBLIC, false, new MemberName ("MoveNext"),
- Parameters.EmptyReadOnlyParameters, null,
- Location.Null);
- AddMethod (move_next);
+ move_next_method = new MoveNextMethod (this, Location);
+
+ original_block.ReParent (block, move_next_method);
- Block block = move_next.Block = new Block (null);
+ move_next_method.CreateMethod (ec);
- MoveNextMethod inline = new MoveNextMethod (this, Location);
- block.AddStatement (inline);
+ AddMethod (move_next_method.method);
}
void Define_GetEnumerator (bool is_generic)
if (is_generic) {
left = new MemberName (
"System.Collections.Generic.IEnumerable",
- generic_args);
+ generic_args, Location);
type = generic_enumerator_type;
} else {
- left = new MemberName ("System.Collections.IEnumerable");
+ left = new MemberName ("System.Collections.IEnumerable", Location);
type = enumerator_type;
}
- MemberName name = new MemberName (left, "GetEnumerator", null);
+ MemberName name = new MemberName (left, "GetEnumerator", Location);
Method get_enumerator = new Method (
- this, type, 0, false, name,
- Parameters.EmptyReadOnlyParameters, null,
- Location.Null);
+ this, null, type, 0, false, name,
+ Parameters.EmptyReadOnlyParameters, null);
AddMethod (get_enumerator);
- get_enumerator.Block = new Block (null);
+ get_enumerator.Block = new ToplevelBlock (
+ block, parameters.Parameters, Location);
+
+ get_enumerator.Block.SetHaveAnonymousMethods (Location, move_next_method);
+
+ Expression ce = new MemberAccess (
+ new SimpleName ("System.Threading.Interlocked", Location),
+ "CompareExchange", Location);
+
+ Expression pc = new FieldExpression (this, pc_field);
+ Expression before = new IntLiteral ((int) State.Running, Location);
+ Expression uninitialized = new IntLiteral ((int) State.Uninitialized, Location);
+
+ ArrayList args = new ArrayList ();
+ args.Add (new Argument (pc, Argument.AType.Ref));
+ args.Add (new Argument (before, Argument.AType.Expression));
+ args.Add (new Argument (uninitialized, Argument.AType.Expression));
+
+ get_enumerator.Block.AddStatement (new If (
+ new Binary (
+ Binary.Operator.Equality,
+ new Invocation (ce, args),
+ uninitialized),
+ new Return (new ThisParameterReference (type.Type, Location),
+ Location),
+ Location));
+
+ args = new ArrayList ();
+ if (!IsStatic) {
+ args.Add (new Argument (new CapturedThisReference (this, Location)));
+ }
+
+ args.Add (new Argument (new BoolLiteral (true, Location)));
+
+ for (int i = 0; i < parameters.Count; i++) {
+ Expression cp = new CapturedParameterReference (
+ this, parameters.ParameterType (i),
+ parameters.ParameterName (i), Location);
+ args.Add (new Argument (cp));
+ }
- This the_this = new This (block, Location);
- get_enumerator.Block.AddStatement (new Return (the_this, Location));
+ Expression new_expr = new New (current_type, args, Location);
+ get_enumerator.Block.AddStatement (new Return (new_expr, Location));
}
protected class SimpleParameterReference : Expression
}
public override void Emit (EmitContext ec)
+ {
+ DoEmit (ec);
+ }
+
+ protected virtual void DoEmit (EmitContext ec)
{
ParameterReference.EmitLdArg (ec.ig, idx);
}
}
+ protected class ThisParameterReference : SimpleParameterReference, IMemoryLocation
+ {
+ public ThisParameterReference (Type type, Location loc)
+ : base (type, 0, loc)
+ { }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ base.DoEmit (ec);
+ if (ec.TypeContainer is Struct)
+ ec.ig.Emit (OpCodes.Ldobj, type);
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ if (ec.TypeContainer is Struct)
+ ec.ig.Emit (OpCodes.Ldarga, 0);
+ else
+ ec.ig.Emit (OpCodes.Ldarg, 0);
+ }
+ }
+
+ protected class CapturedParameterReference : Expression
+ {
+ Iterator iterator;
+ string name;
+
+ public CapturedParameterReference (Iterator iterator, Type type,
+ string name, Location loc)
+ {
+ this.iterator = iterator;
+ this.loc = loc;
+ this.type = type;
+ this.name = name;
+ eclass = ExprClass.Variable;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.CurrentAnonymousMethod = iterator.move_next_method;
+
+ iterator.cc.EmitParameter (ec, name);
+ }
+ }
+
+ protected class CapturedThisReference : Expression
+ {
+ public CapturedThisReference (Iterator iterator, Location loc)
+ {
+ this.loc = loc;
+ this.type = iterator.this_type;
+ eclass = ExprClass.Variable;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitThis ();
+ }
+ }
+
protected class FieldExpression : Expression
{
+ Iterator iterator;
Field field;
- public FieldExpression (Field field)
+ public FieldExpression (Iterator iterator, Field field)
{
+ this.iterator = iterator;
this.field = field;
+ this.loc = iterator.Location;
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ FieldExpr fexpr = new FieldExpr (field.FieldBuilder, loc);
+ fexpr.InstanceExpression = new ThisParameterReference (
+ iterator.this_type, loc);
+ return fexpr.ResolveLValue (ec, right_side, loc);
}
public override Expression DoResolve (EmitContext ec)
{
FieldExpr fexpr = new FieldExpr (field.FieldBuilder, loc);
- fexpr.InstanceExpression = ec.GetThis (loc);
+ fexpr.InstanceExpression = new ThisParameterReference (
+ iterator.this_type, loc);
return fexpr.Resolve (ec);
}
}
}
- public class MoveNextMethod : Statement {
+ protected class MoveNextMethod : AnonymousContainer
+ {
Iterator iterator;
public MoveNextMethod (Iterator iterator, Location loc)
+ : base (iterator.parameters.Parameters, iterator.original_block, loc)
+ {
+ this.iterator = iterator;
+ }
+
+ protected override bool CreateMethodHost (EmitContext ec)
+ {
+ method = new Method (
+ iterator, null, TypeManager.system_boolean_expr,
+ Modifiers.PUBLIC, false, new MemberName ("MoveNext", loc),
+ Parameters.EmptyReadOnlyParameters, null);
+
+ method.Block = Block;
+
+ MoveNextStatement inline = new MoveNextStatement (iterator, loc);
+ Block.AddStatement (inline);
+
+ return true;
+ }
+
+ public bool CreateMethod (EmitContext ec)
+ {
+ return CreateMethodHost (ec);
+ }
+
+ public override Iterator Iterator {
+ get { return iterator; }
+ }
+
+ public override bool IsIterator {
+ get { return true; }
+ }
+
+ public override void CreateScopeType (EmitContext ec, ScopeInfo scope)
+ {
+ scope.ScopeTypeBuilder = iterator.TypeBuilder;
+ scope.ScopeConstructor = iterator.ctor.ConstructorBuilder;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new InternalErrorException ();
+ }
+ }
+
+ protected class MoveNextStatement : Statement {
+ Iterator iterator;
+
+ public MoveNextStatement (Iterator iterator, Location loc)
{
this.loc = loc;
this.iterator = iterator;
public override bool Resolve (EmitContext ec)
{
- ec.CurrentBranching.CurrentUsageVector.Return ();
return true;
}
protected override void DoEmit (EmitContext ec)
{
- int code_flags = Modifiers.METHOD_YIELDS;
- if (iterator.is_static)
- code_flags |= Modifiers.STATIC;
+ ec.CurrentAnonymousMethod = iterator.move_next_method;
+ ec.InIterator = true;
+
+ iterator.EmitMoveNext (ec);
+ }
+ }
+
+ protected class DisposeMethod : Statement {
+ Iterator iterator;
+
+ public DisposeMethod (Iterator iterator, Location loc)
+ {
+ this.loc = loc;
+ this.iterator = iterator;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ iterator.EmitDispose (ec);
+ }
+ }
+
+ protected class StatementList : Statement {
+ ArrayList statements;
+
+ public StatementList (Location loc)
+ {
+ this.loc = loc;
+ statements = new ArrayList ();
+ }
+
+ public void Add (Statement statement)
+ {
+ statements.Add (statement);
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ foreach (Statement stmt in statements) {
+ if (!stmt.Resolve (ec))
+ return false;
+ }
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ foreach (Statement stmt in statements)
+ stmt.Emit (ec);
+ }
+ }
- EmitContext new_ec = new EmitContext (
- iterator.container, loc, ec.ig,
- iterator.return_type, code_flags);
+ protected class SetState : Statement
+ {
+ Iterator iterator;
+ State state;
- new_ec.CurrentIterator = iterator;
+ public SetState (Iterator iterator, State state, Location loc)
+ {
+ this.iterator = iterator;
+ this.state = state;
+ this.loc = loc;
+ }
- iterator.EmitMoveNext (new_ec);
+ public override bool Resolve (EmitContext ec)
+ {
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ IntConstant.EmitInt (ec.ig, (int) state);
+ ec.ig.Emit (OpCodes.Stfld, iterator.pc_field.FieldBuilder);
}
}
- protected class DoYieldBreak : Statement
+ protected class InitScope : Statement
{
Iterator iterator;
- bool add_return;
- public DoYieldBreak (Iterator iterator, bool add_return,
- Location loc)
+ public InitScope (Iterator iterator, Location loc)
{
this.iterator = iterator;
- this.add_return = add_return;
this.loc = loc;
}
public override bool Resolve (EmitContext ec)
{
- if (add_return)
- ec.CurrentBranching.CurrentUsageVector.Return ();
return true;
}
protected override void DoEmit (EmitContext ec)
{
- iterator.EmitYieldBreak (ec.ig, add_return);
+ iterator.cc.EmitInitScope (ec);
}
}
void Define_Reset ()
{
Method reset = new Method (
- this, TypeManager.system_void_expr, Modifiers.PUBLIC,
- false, new MemberName ("Reset"),
- Parameters.EmptyReadOnlyParameters, null, Location);
+ this, null, TypeManager.system_void_expr, Modifiers.PUBLIC,
+ false, new MemberName ("Reset", Location),
+ Parameters.EmptyReadOnlyParameters, null);
AddMethod (reset);
- reset.Block = new Block (null);
+ reset.Block = new ToplevelBlock (Location);
+ reset.Block = new ToplevelBlock (block, parameters.Parameters, Location);
+ reset.Block.SetHaveAnonymousMethods (Location, move_next_method);
+
reset.Block.AddStatement (Create_ThrowNotSupported ());
}
void Define_Dispose ()
{
- Method dispose = new Method (
- this, TypeManager.system_void_expr, Modifiers.PUBLIC,
- false, new MemberName ("Dispose"),
- Parameters.EmptyReadOnlyParameters, null, Location);
+ dispose = new Method (
+ this, null, TypeManager.system_void_expr, Modifiers.PUBLIC,
+ false, new MemberName ("Dispose", Location),
+ Parameters.EmptyReadOnlyParameters, null);
AddMethod (dispose);
- dispose.Block = new Block (null);
- dispose.Block.AddStatement (new DoYieldBreak (this, false, Location));
- dispose.Block.AddStatement (new Return (null, Location));
- }
+ dispose.Block = new ToplevelBlock (block, parameters.Parameters, Location);
+ dispose.Block.SetHaveAnonymousMethods (Location, move_next_method);
- public Block Block {
- get { return block; }
+ dispose.Block.AddStatement (new DisposeMethod (this, Location));
}
public Type IteratorType {
- get { return iterator_type; }
+ get { return iterator_type_expr.Type; }
}
//
// This return statement tricks return into not flagging an error for being
// used in a Yields method
//
- class NoCheckReturn : Return {
- public NoCheckReturn (Expression expr, Location loc) : base (expr, loc)
+ class NoCheckReturn : Statement {
+ public Expression Expr;
+
+ public NoCheckReturn (Expression expr, Location l)
{
+ Expr = expr;
+ loc = l;
}
public override bool Resolve (EmitContext ec)
{
- ec.InIterator = false;
- bool ret_val = base.Resolve (ec);
- ec.InIterator = true;
+ Expr = Expr.Resolve (ec);
+ if (Expr == null)
+ return false;
+
+ ec.CurrentBranching.CurrentUsageVector.Return ();
- return ret_val;
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ Expr.Emit (ec);
+ ec.ig.Emit (OpCodes.Ret);
}
}
- bool CheckType (Type t)
+ bool CheckType ()
{
- if (t == TypeManager.ienumerable_type) {
- iterator_type = TypeManager.object_type;
+ Type ret = orig_method.ReturnType;
+
+ if (ret == TypeManager.ienumerable_type) {
+ original_iterator_type = TypeManager.object_type;
is_enumerable = true;
return true;
- } else if (t == TypeManager.ienumerator_type) {
- iterator_type = TypeManager.object_type;
+ }
+ if (ret == TypeManager.ienumerator_type) {
+ original_iterator_type = TypeManager.object_type;
is_enumerable = false;
return true;
}
- if (!t.IsGenericInstance)
+ if (!ret.IsGenericInstance)
return false;
- Type[] args = TypeManager.GetTypeArguments (t);
+ Type[] args = TypeManager.GetTypeArguments (ret);
if (args.Length != 1)
return false;
- Type gt = t.GetGenericTypeDefinition ();
+ Type gt = ret.GetGenericTypeDefinition ();
if (gt == TypeManager.generic_ienumerable_type) {
- iterator_type = args [0];
+ original_iterator_type = args [0];
is_enumerable = true;
return true;
} else if (gt == TypeManager.generic_ienumerator_type) {
- iterator_type = args [0];
+ original_iterator_type = args [0];
is_enumerable = false;
return true;
}
projects / mono.git / blobdiff