/// <summary>
/// Resolves the statement, true means that all sub-statements
/// did resolve ok.
- // </summary>
+ /// </summary>
public virtual bool Resolve (BlockContext bc)
{
return true;
// in unreachable code, for instance.
//
- if (warn)
+ bool unreachable = false;
+ if (warn && !ec.UnreachableReported) {
+ ec.UnreachableReported = true;
+ unreachable = true;
ec.Report.Warning (162, 2, loc, "Unreachable code detected");
+ }
ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
bool ok = Resolve (ec);
ec.KillFlowBranching ();
+ if (unreachable) {
+ ec.UnreachableReported = false;
+ }
+
return ok;
}
return false;
empty = true;
return true;
- } else
- infinite = true;
+ }
+
+ infinite = true;
}
ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
return false;
empty = true;
return true;
- } else
- infinite = true;
+ }
+
+ infinite = true;
}
} else
infinite = true;
public StatementExpression (ExpressionStatement expr)
{
this.expr = expr;
- loc = expr.Location;
+ loc = expr.StartLocation;
}
public StatementExpression (ExpressionStatement expr, Location loc)
public class StatementErrorExpression : Statement
{
- readonly Expression expr;
+ Expression expr;
public StatementErrorExpression (Expression expr)
{
this.expr = expr;
+ this.loc = expr.StartLocation;
}
public Expression Expr {
}
}
+ public override bool Resolve (BlockContext bc)
+ {
+ expr.Error_InvalidExpressionStatement (bc);
+ return true;
+ }
+
protected override void DoEmit (EmitContext ec)
{
throw new NotSupportedException ();
protected override void CloneTo (CloneContext clonectx, Statement target)
{
- throw new NotImplementedException ();
+ var t = (StatementErrorExpression) target;
+
+ t.expr = expr.Clone (clonectx);
}
public override object Accept (StructuralVisitor visitor)
public StatementList (Statement first, Statement second)
{
- statements = new List<Statement> () { first, second };
+ statements = new List<Statement> { first, second };
}
#region Properties
if (ec.CurrentIterator != null) {
Error_ReturnFromIterator (ec);
- } else {
+ } else if (ec.ReturnType != InternalType.ErrorType) {
ec.Report.Error (126, loc,
"An object of a type convertible to `{0}' is required for the return statement",
ec.ReturnType.GetSignatureForError ());
if (this is ContextualReturn)
return true;
- ec.Report.Error (1997, loc,
- "`{0}': A return keyword must not be followed by an expression when async method returns `Task'. Consider using `Task<T>' return type",
- ec.GetSignatureForError ());
+ // Same error code as .NET but better error message
+ if (async_block.DelegateType != null) {
+ ec.Report.Error (1997, loc,
+ "`{0}': A return keyword must not be followed by an expression when async delegate returns `Task'. Consider using `Task<T>' return type",
+ async_block.DelegateType.GetSignatureForError ());
+ } else {
+ ec.Report.Error (1997, loc,
+ "`{0}': A return keyword must not be followed by an expression when async method returns `Task'. Consider using `Task<T>' return type",
+ ec.GetSignatureForError ());
+
+ }
+
return false;
}
}
var l = am as AnonymousMethodBody;
- if (l != null && l.ReturnTypeInference != null && expr != null) {
- l.ReturnTypeInference.AddCommonTypeBound (expr.Type);
- return true;
+ if (l != null && expr != null) {
+ if (l.ReturnTypeInference != null) {
+ l.ReturnTypeInference.AddCommonTypeBound (expr.Type);
+ return true;
+ }
+
+ //
+ // Try to optimize simple lambda. Only when optimizations are enabled not to cause
+ // unexpected debugging experience
+ //
+ if (this is ContextualReturn && !ec.IsInProbingMode && ec.Module.Compiler.Settings.Optimize) {
+ l.DirectMethodGroupConversion = expr.CanReduceLambda (l);
+ }
}
}
}
return false;
}
- if (!ec.Switch.GotDefault) {
- FlowBranchingBlock.Error_UnknownLabel (loc, "default", ec.Report);
- return false;
- }
+ ec.Switch.RegisterGotoCase (null, null);
return true;
}
protected override void DoEmit (EmitContext ec)
{
- ec.Emit (OpCodes.Br, ec.Switch.DefaultLabel);
+ ec.Emit (OpCodes.Br, ec.Switch.DefaultLabel.GetILLabel (ec));
}
public override object Accept (StructuralVisitor visitor)
/// </summary>
public class GotoCase : Statement {
Expression expr;
- SwitchLabel sl;
public GotoCase (Expression e, Location l)
{
return this.expr;
}
}
+
+ public SwitchLabel Label { get; set; }
public override bool Resolve (BlockContext ec)
{
ec.CurrentBranching.CurrentUsageVector.Goto ();
- expr = expr.Resolve (ec);
- if (expr == null)
- return false;
-
- Constant c = expr as Constant;
+ Constant c = expr.ResolveLabelConstant (ec);
if (c == null) {
- ec.Report.Error (150, expr.Location, "A constant value is expected");
return false;
}
res = c;
} else {
TypeSpec type = ec.Switch.SwitchType;
- res = c.TryReduce (ec, type);
+ res = c.Reduce (ec, type);
if (res == null) {
c.Error_ValueCannotBeConverted (ec, type, true);
return false;
if (!Convert.ImplicitStandardConversionExists (c, type))
ec.Report.Warning (469, 2, loc,
"The `goto case' value is not implicitly convertible to type `{0}'",
- TypeManager.CSharpName (type));
+ type.GetSignatureForError ());
}
- sl = ec.Switch.ResolveGotoCase (ec, res);
+ ec.Switch.RegisterGotoCase (this, res);
return true;
}
protected override void DoEmit (EmitContext ec)
{
- ec.Emit (OpCodes.Br, sl.GetILLabel (ec));
+ ec.Emit (OpCodes.Br, Label.GetILLabel (ec));
}
protected override void CloneTo (CloneContext clonectx, Statement t)
Location Location { get; }
}
- public class BlockVariableDeclaration : Statement
+ public class BlockVariableDeclarator
{
- public class Declarator
+ LocalVariable li;
+ Expression initializer;
+
+ public BlockVariableDeclarator (LocalVariable li, Expression initializer)
{
- LocalVariable li;
- Expression initializer;
+ if (li.Type != null)
+ throw new ArgumentException ("Expected null variable type");
- public Declarator (LocalVariable li, Expression initializer)
- {
- if (li.Type != null)
- throw new ArgumentException ("Expected null variable type");
+ this.li = li;
+ this.initializer = initializer;
+ }
- this.li = li;
- this.initializer = initializer;
- }
+ #region Properties
- public Declarator (Declarator clone, Expression initializer)
- {
- this.li = clone.li;
- this.initializer = initializer;
+ public LocalVariable Variable {
+ get {
+ return li;
}
+ }
- #region Properties
-
- public LocalVariable Variable {
- get {
- return li;
- }
+ public Expression Initializer {
+ get {
+ return initializer;
}
-
- public Expression Initializer {
- get {
- return initializer;
- }
- set {
- initializer = value;
- }
+ set {
+ initializer = value;
}
+ }
- #endregion
+ #endregion
+
+ public virtual BlockVariableDeclarator Clone (CloneContext cloneCtx)
+ {
+ var t = (BlockVariableDeclarator) MemberwiseClone ();
+ if (initializer != null)
+ t.initializer = initializer.Clone (cloneCtx);
+
+ return t;
}
+ }
+ public class BlockVariable : Statement
+ {
Expression initializer;
protected FullNamedExpression type_expr;
protected LocalVariable li;
- protected List<Declarator> declarators;
+ protected List<BlockVariableDeclarator> declarators;
TypeSpec type;
- public BlockVariableDeclaration (FullNamedExpression type, LocalVariable li)
+ public BlockVariable (FullNamedExpression type, LocalVariable li)
{
this.type_expr = type;
this.li = li;
this.loc = type_expr.Location;
}
- protected BlockVariableDeclaration (LocalVariable li)
+ protected BlockVariable (LocalVariable li)
{
this.li = li;
}
#region Properties
- public List<Declarator> Declarators {
+ public List<BlockVariableDeclarator> Declarators {
get {
return declarators;
}
#endregion
- public void AddDeclarator (Declarator decl)
+ public void AddDeclarator (BlockVariableDeclarator decl)
{
if (declarators == null)
- declarators = new List<Declarator> ();
+ declarators = new List<BlockVariableDeclarator> ();
declarators.Add (decl);
}
bool eval_global = bc.Module.Compiler.Settings.StatementMode && bc.CurrentBlock is ToplevelBlock;
if (eval_global) {
CreateEvaluatorVariable (bc, li);
- } else {
+ } else if (type != InternalType.ErrorType) {
li.PrepareForFlowAnalysis (bc);
}
d.Variable.Type = li.Type;
if (eval_global) {
CreateEvaluatorVariable (bc, d.Variable);
- } else {
+ } else if (type != InternalType.ErrorType) {
d.Variable.PrepareForFlowAnalysis (bc);
}
protected override void CloneTo (CloneContext clonectx, Statement target)
{
- BlockVariableDeclaration t = (BlockVariableDeclaration) target;
+ BlockVariable t = (BlockVariable) target;
if (type_expr != null)
t.type_expr = (FullNamedExpression) type_expr.Clone (clonectx);
if (declarators != null) {
t.declarators = null;
foreach (var d in declarators)
- t.AddDeclarator (new Declarator (d, d.Initializer == null ? null : d.Initializer.Clone (clonectx)));
+ t.AddDeclarator (d.Clone (clonectx));
}
}
}
}
- public class BlockConstantDeclaration : BlockVariableDeclaration
+ public class BlockConstant : BlockVariable
{
- public BlockConstantDeclaration (FullNamedExpression type, LocalVariable li)
+ public BlockConstant (FullNamedExpression type, LocalVariable li)
: base (type, li)
{
}
HasAsyncModifier = 1 << 10,
Resolved = 1 << 11,
YieldBlock = 1 << 12,
- AwaitBlock = 1 << 13
+ AwaitBlock = 1 << 13,
+ Iterator = 1 << 14
}
public Block Parent;
#endif
// int assignable_slots;
- bool unreachable_shown;
- bool unreachable;
-
+
public Block (Block parent, Location start, Location end)
: this (parent, 0, start, end)
{
#endregion
- public Block CreateSwitchBlock (Location start)
- {
- // FIXME: Only explicit block should be created
- var new_block = new Block (this, start, start);
- new_block.IsCompilerGenerated = true;
- return new_block;
- }
-
public void SetEndLocation (Location loc)
{
EndLocation = loc;
scope_initializers.Add (s);
}
}
+
+ public void InsertStatement (int index, Statement s)
+ {
+ statements.Insert (index, s);
+ }
public void AddStatement (Statement s)
{
Block prev_block = ec.CurrentBlock;
bool ok = true;
+ bool unreachable = ec.IsUnreachable;
+ bool prev_unreachable = unreachable;
ec.CurrentBlock = this;
ec.StartFlowBranching (this);
if (s is EmptyStatement)
continue;
- if (!unreachable_shown && !(s is LabeledStatement)) {
+ if (!ec.UnreachableReported && !(s is LabeledStatement) && !(s is SwitchLabel)) {
ec.Report.Warning (162, 2, s.loc, "Unreachable code detected");
- unreachable_shown = true;
+ ec.UnreachableReported = true;
}
-
- Block c_block = s as Block;
- if (c_block != null)
- c_block.unreachable = c_block.unreachable_shown = true;
}
//
if (!s.Resolve (ec)) {
ok = false;
- if (ec.IsInProbingMode)
- break;
+ if (!ec.IsInProbingMode)
+ statements [ix] = new EmptyStatement (s.loc);
- statements [ix] = new EmptyStatement (s.loc);
continue;
}
- if (unreachable && !(s is LabeledStatement) && !(s is Block))
+ if (unreachable && !(s is LabeledStatement) && !(s is SwitchLabel) && !(s is Block))
statements [ix] = new EmptyStatement (s.loc);
unreachable = ec.CurrentBranching.CurrentUsageVector.IsUnreachable;
- if (unreachable && s is LabeledStatement)
- throw new InternalErrorException ("should not happen");
+ if (unreachable) {
+ ec.IsUnreachable = true;
+ } else if (ec.IsUnreachable)
+ ec.IsUnreachable = false;
+ }
+
+ if (unreachable != prev_unreachable) {
+ ec.IsUnreachable = prev_unreachable;
+ ec.UnreachableReported = false;
}
while (ec.CurrentBranching is FlowBranchingLabeled)
public override bool ResolveUnreachable (BlockContext ec, bool warn)
{
- unreachable_shown = true;
- unreachable = true;
-
- if (warn)
+ bool unreachable = false;
+ if (warn && !ec.UnreachableReported) {
+ ec.UnreachableReported = true;
+ unreachable = true;
ec.Report.Warning (162, 2, loc, "Unreachable code detected");
+ }
var fb = ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
fb.CurrentUsageVector.IsUnreachable = true;
bool ok = Resolve (ec);
ec.KillFlowBranching ();
+ if (unreachable)
+ ec.UnreachableReported = false;
+
return ok;
}
}
if (b.Explicit == b.Explicit.ParametersBlock && b.Explicit.ParametersBlock.StateMachine != null) {
- storey.HoistedThis = b.Explicit.ParametersBlock.StateMachine.HoistedThis;
- break;
+ if (storey.HoistedThis == null)
+ storey.HoistedThis = b.Explicit.ParametersBlock.StateMachine.HoistedThis;
+
+ if (storey.HoistedThis != null)
+ break;
}
}
-
+
//
- // We are the first storey on path and this has to be hoisted
+ // We are the first storey on path and 'this' has to be hoisted
//
if (storey.HoistedThis == null) {
foreach (ExplicitBlock ref_block in Original.ParametersBlock.TopBlock.ThisReferencesFromChildrenBlock) {
if (block_on_path == null)
continue;
- if (storey.HoistedThis == null)
- storey.AddCapturedThisField (ec);
+ if (storey.HoistedThis == null) {
+ storey.AddCapturedThisField (ec, null);
+ }
for (ExplicitBlock b = ref_block; b.AnonymousMethodStorey != storey; b = b.Parent.Explicit) {
+ ParametersBlock pb;
+
if (b.AnonymousMethodStorey != null) {
+ //
+ // Don't add storey cross reference for `this' when the storey ends up not
+ // beeing attached to any parent
+ //
+ if (b.ParametersBlock.StateMachine == null) {
+ AnonymousMethodStorey s = null;
+ for (Block ab = b.AnonymousMethodStorey.OriginalSourceBlock.Parent; ab != null; ab = ab.Parent) {
+ s = ab.Explicit.AnonymousMethodStorey;
+ if (s != null)
+ break;
+ }
+
+ // Needs to be in sync with AnonymousMethodBody::DoCreateMethodHost
+ if (s == null) {
+ var parent = storey == null || storey.Kind == MemberKind.Struct ? null : storey;
+ b.AnonymousMethodStorey.AddCapturedThisField (ec, parent);
+ break;
+ }
+ }
+
b.AnonymousMethodStorey.AddParentStoreyReference (ec, storey);
b.AnonymousMethodStorey.HoistedThis = storey.HoistedThis;
b = b.ParametersBlock;
}
- var pb = b as ParametersBlock;
+ pb = b as ParametersBlock;
if (pb != null && pb.StateMachine != null) {
if (pb.StateMachine == storey)
break;
+ //
+ // If we are state machine with no parent. We can hook into parent without additional
+ // reference and capture this directly
+ //
+ ExplicitBlock parent_storey_block = pb;
+ while (parent_storey_block.Parent != null) {
+ parent_storey_block = parent_storey_block.Parent.Explicit;
+ if (parent_storey_block.AnonymousMethodStorey != null) {
+ break;
+ }
+ }
+
+ if (parent_storey_block.AnonymousMethodStorey == null) {
+ pb.StateMachine.AddCapturedThisField (ec, null);
+ b.HasCapturedThis = true;
+ continue;
+ }
+
pb.StateMachine.AddParentStoreyReference (ec, storey);
}
-
+
b.HasCapturedVariable = true;
}
}
}
storey.Define ();
+ storey.PrepareEmit ();
storey.Parent.PartialContainer.AddCompilerGeneratedClass (storey);
}
public void RegisterIteratorYield ()
{
+ ParametersBlock.TopBlock.IsIterator = true;
+
var block = this;
while ((block.flags & Flags.YieldBlock) == 0) {
block.flags |= Flags.YieldBlock;
public override Expression CreateExpressionTree (ResolveContext ec)
{
if (statements.Count == 1) {
- Expression expr = ((Statement) statements[0]).CreateExpressionTree (ec);
+ Expression expr = statements[0].CreateExpressionTree (ec);
if (scope_initializers != null)
expr = new BlockScopeExpression (expr, this);
unreachable = top_level.End ();
}
} catch (Exception e) {
- if (e is CompletionResult || rc.Report.IsDisabled || e is FatalException)
+ if (e is CompletionResult || rc.Report.IsDisabled || e is FatalException || rc.Report.Printer is NullReportPrinter)
throw;
if (rc.CurrentBlock != null) {
return tlb;
}
- public ParametersBlock ConvertToAsyncTask (IMemberContext context, TypeDefinition host, ParametersCompiled parameters, TypeSpec returnType, Location loc)
+ public ParametersBlock ConvertToAsyncTask (IMemberContext context, TypeDefinition host, ParametersCompiled parameters, TypeSpec returnType, TypeSpec delegateType, Location loc)
{
for (int i = 0; i < parameters.Count; i++) {
Parameter p = parameters[i];
var block_type = host.Module.Compiler.BuiltinTypes.Void;
var initializer = new AsyncInitializer (this, host, block_type);
initializer.Type = block_type;
+ initializer.DelegateType = delegateType;
var stateMachine = new AsyncTaskStorey (this, context, initializer, returnType);
public bool IsIterator {
get {
- return HasYield;
+ return (flags & Flags.Iterator) != 0;
+ }
+ set {
+ flags = value ? flags | Flags.Iterator : flags & ~Flags.Iterator;
}
}
//
// A collision checking between local names
//
+ var variable_block = li.Block.Explicit;
for (int i = 0; i < existing_list.Count; ++i) {
existing = existing_list[i];
Block b = existing.Block.Explicit;
// Collision at same level
- if (li.Block.Explicit == b) {
+ if (variable_block == b) {
li.Block.Error_AlreadyDeclared (name, li);
break;
}
// Collision with parent
- Block parent = li.Block.Explicit;
+ Block parent = variable_block;
while ((parent = parent.Parent) != null) {
if (parent == b) {
li.Block.Error_AlreadyDeclared (name, li, "parent or current");
}
}
- if (!ignoreChildrenBlocks) {
+ if (!ignoreChildrenBlocks && variable_block.Parent != b.Parent) {
// Collision with children
while ((b = b.Parent) != null) {
- if (li.Block.Explicit == b) {
+ if (variable_block == b) {
li.Block.Error_AlreadyDeclared (name, li, "child");
i = existing_list.Count;
break;
int count = parameters.Count;
Arguments args = new Arguments (count);
for (int i = 0; i < count; ++i) {
- var arg_expr = GetParameterReference (i, parameter_info[i].Location);
- args.Add (new Argument (arg_expr));
+ var pi = parameter_info[i];
+ var arg_expr = GetParameterReference (i, pi.Location);
+
+ Argument.AType atype_modifier;
+ switch (pi.Parameter.ParameterModifier & Parameter.Modifier.RefOutMask) {
+ case Parameter.Modifier.REF:
+ atype_modifier = Argument.AType.Ref;
+ break;
+ case Parameter.Modifier.OUT:
+ atype_modifier = Argument.AType.Out;
+ break;
+ default:
+ atype_modifier = 0;
+ break;
+ }
+
+ args.Add (new Argument (arg_expr, atype_modifier));
}
return args;
if (label != null) {
if (label.Block == b.Original)
return label;
-
- // TODO: Temporary workaround for the switch block implicit label block
- if (label.Block.IsCompilerGenerated && label.Block.Parent == b.Original)
- return label;
} else {
List<LabeledStatement> list = (List<LabeledStatement>) value;
for (int i = 0; i < list.Count; ++i) {
label = list[i];
if (label.Block == b.Original)
return label;
-
- // TODO: Temporary workaround for the switch block implicit label block
- if (label.Block.IsCompilerGenerated && label.Block.Parent == b.Original)
- return label;
}
}
if (Report.Errors > 0)
return;
-#if PRODUCTION
try {
-#endif
if (IsCompilerGenerated) {
using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
base.Emit (ec);
ec.Emit (OpCodes.Ret);
}
-#if PRODUCTION
- } catch (Exception e){
- Console.WriteLine ("Exception caught by the compiler while emitting:");
- Console.WriteLine (" Block that caused the problem begin at: " + block.loc);
-
- Console.WriteLine (e.GetType ().FullName + ": " + e.Message);
- throw;
+ } catch (Exception e) {
+ throw new InternalErrorException (e, StartLocation);
}
-#endif
}
}
- public class SwitchLabel {
+ public class SwitchLabel : Statement
+ {
Expression label;
Constant converted;
- readonly Location loc;
Label? il_label;
}
}
+ public bool SectionStart { get; set; }
+
public Label GetILLabel (EmitContext ec)
{
if (il_label == null){
return il_label.Value;
}
+ protected override void DoEmit (EmitContext ec)
+ {
+ ec.MarkLabel (GetILLabel (ec));
+ }
+
+ public override bool Resolve (BlockContext bc)
+ {
+ if (ResolveAndReduce (bc))
+ bc.Switch.RegisterLabel (bc, this);
+
+ bc.CurrentBranching.CurrentUsageVector.ResetBarrier ();
+
+ return base.Resolve (bc);
+ }
+
//
// Resolves the expression, reduces it to a literal if possible
// and then converts it to the requested type.
//
- public bool ResolveAndReduce (ResolveContext ec, TypeSpec required_type, bool allow_nullable)
- {
- Expression e = label.Resolve (ec);
+ bool ResolveAndReduce (ResolveContext rc)
+ {
+ if (IsDefault)
+ return true;
- if (e == null)
+ var c = label.ResolveLabelConstant (rc);
+ if (c == null)
return false;
- Constant c = e as Constant;
- if (c == null){
- ec.Report.Error (150, loc, "A constant value is expected");
- return false;
- }
-
- if (allow_nullable && c is NullLiteral) {
+ if (rc.Switch.IsNullable && c is NullLiteral) {
converted = c;
return true;
}
- converted = c.ImplicitConversionRequired (ec, required_type, loc);
+ converted = c.ImplicitConversionRequired (rc, rc.Switch.SwitchType);
return converted != null;
}
- public void Error_AlreadyOccurs (ResolveContext ec, TypeSpec switch_type, SwitchLabel collision_with)
+ public void Error_AlreadyOccurs (ResolveContext ec, SwitchLabel collision_with)
{
string label;
if (converted == null)
ec.Report.Error (152, loc, "The label `case {0}:' already occurs in this switch statement", label);
}
- public SwitchLabel Clone (CloneContext clonectx)
- {
- if (label == null)
- return this;
-
- return new SwitchLabel (label.Clone (clonectx), loc);
- }
- }
-
- public class SwitchSection {
- public readonly List<SwitchLabel> Labels;
- public readonly Block Block;
-
- public SwitchSection (List<SwitchLabel> labels, Block block)
+ protected override void CloneTo (CloneContext clonectx, Statement target)
{
- Labels = labels;
- Block = block;
+ var t = (SwitchLabel) target;
+ if (label != null)
+ t.label = label.Clone (clonectx);
}
- public SwitchSection Clone (CloneContext clonectx)
+ public override object Accept (StructuralVisitor visitor)
{
- var cloned_labels = new List<SwitchLabel> ();
-
- foreach (SwitchLabel sl in Labels)
- cloned_labels.Add (sl.Clone (clonectx));
-
- return new SwitchSection (cloned_labels, clonectx.LookupBlock (Block));
+ return visitor.Visit (this);
}
}
-
+
public class Switch : Statement
{
// structure used to hold blocks of keys while calculating table switch
}
}
- sealed class LabelMarker : Statement
+ sealed class DispatchStatement : Statement
{
- readonly Switch s;
- readonly List<SwitchLabel> labels;
+ readonly Switch body;
- public LabelMarker (Switch s, List<SwitchLabel> labels)
+ public DispatchStatement (Switch body)
{
- this.s = s;
- this.labels = labels;
+ this.body = body;
}
protected override void CloneTo (CloneContext clonectx, Statement target)
{
+ throw new NotImplementedException ();
}
protected override void DoEmit (EmitContext ec)
{
- foreach (var l in labels) {
- if (l.IsDefault)
- ec.MarkLabel (s.DefaultLabel);
- else
- ec.MarkLabel (l.GetILLabel (ec));
- }
+ body.EmitDispatch (ec);
}
}
- public List<SwitchSection> Sections;
public Expression Expr;
//
//
Dictionary<long, SwitchLabel> labels;
Dictionary<string, SwitchLabel> string_labels;
+ List<SwitchLabel> case_labels;
+
+ List<Tuple<GotoCase, Constant>> goto_cases;
/// <summary>
/// The governing switch type
/// </summary>
public TypeSpec SwitchType;
- //
- // Computed
- //
- Label default_target;
- Label null_target;
Expression new_expr;
- bool is_constant;
- SwitchSection constant_section;
- SwitchSection default_section;
- SwitchLabel null_section;
+ SwitchLabel case_null;
+ SwitchLabel case_default;
- Statement simple_stmt;
+ Label defaultLabel, nullLabel;
VariableReference value;
ExpressionStatement string_dictionary;
FieldExpr switch_cache_field;
//
Nullable.Unwrap unwrap;
- public Switch (Expression e, ExplicitBlock block, List<SwitchSection> sects, Location l)
+ public Switch (Expression e, ExplicitBlock block, Location l)
{
Expr = e;
this.block = block;
- Sections = sects;
loc = l;
}
}
}
- public Label DefaultLabel {
+ public SwitchLabel DefaultLabel {
get {
- return default_target;
- }
- }
-
- public bool GotDefault {
- get {
- return default_section != null;
+ return case_default;
}
}
};
}
- //
- // Performs the basic sanity checks on the switch statement
- // (looks for duplicate keys and non-constant expressions).
- //
- // It also returns a hashtable with the keys that we will later
- // use to compute the switch tables
- //
- bool CheckSwitch (ResolveContext ec)
+ public void RegisterLabel (ResolveContext rc, SwitchLabel sl)
{
- bool error = false;
- if (SwitchType.BuiltinType == BuiltinTypeSpec.Type.String)
- string_labels = new Dictionary<string, SwitchLabel> (Sections.Count + 1);
- else
- labels = new Dictionary<long, SwitchLabel> (Sections.Count + 1);
-
- foreach (SwitchSection ss in Sections){
- foreach (SwitchLabel sl in ss.Labels){
- if (sl.IsDefault){
- if (default_section != null){
- sl.Error_AlreadyOccurs (ec, SwitchType, default_section.Labels [0]);
- error = true;
- }
- default_section = ss;
- continue;
- }
+ case_labels.Add (sl);
- if (!sl.ResolveAndReduce (ec, SwitchType, IsNullable)) {
- error = true;
- continue;
- }
-
- try {
- if (string_labels != null) {
- string s = sl.Converted.GetValue () as string;
- if (s == null)
- null_section = sl;
- else
- string_labels.Add (s, sl);
- } else {
- if (sl.Converted is NullLiteral) {
- null_section = sl;
- } else {
- labels.Add (sl.Converted.GetValueAsLong (), sl);
- }
- }
- } catch (ArgumentException) {
- if (string_labels != null)
- sl.Error_AlreadyOccurs (ec, SwitchType, string_labels[(string) sl.Converted.GetValue ()]);
- else
- sl.Error_AlreadyOccurs (ec, SwitchType, labels[sl.Converted.GetValueAsLong ()]);
+ if (sl.IsDefault) {
+ if (case_default != null) {
+ sl.Error_AlreadyOccurs (rc, case_default);
+ } else {
+ case_default = sl;
+ }
- error = true;
+ return;
+ }
+
+ try {
+ if (string_labels != null) {
+ string string_value = sl.Converted.GetValue () as string;
+ if (string_value == null)
+ case_null = sl;
+ else
+ string_labels.Add (string_value, sl);
+ } else {
+ if (sl.Converted is NullLiteral) {
+ case_null = sl;
+ } else {
+ labels.Add (sl.Converted.GetValueAsLong (), sl);
}
}
+ } catch (ArgumentException) {
+ if (string_labels != null)
+ sl.Error_AlreadyOccurs (rc, string_labels[(string) sl.Converted.GetValue ()]);
+ else
+ sl.Error_AlreadyOccurs (rc, labels[sl.Converted.GetValueAsLong ()]);
}
- return !error;
}
//
//
void EmitTableSwitch (EmitContext ec, Expression val)
{
- Label lbl_default = default_target;
-
if (labels != null && labels.Count > 0) {
List<LabelsRange> ranges;
if (string_labels != null) {
ranges.Sort ();
}
+ Label lbl_default = defaultLabel;
TypeSpec compare_type = SwitchType.IsEnum ? EnumSpec.GetUnderlyingType (SwitchType) : SwitchType;
for (int range_index = ranges.Count - 1; range_index >= 0; --range_index) {
LabelsRange kb = ranges[range_index];
- lbl_default = (range_index == 0) ? default_target : ec.DefineLabel ();
+ lbl_default = (range_index == 0) ? defaultLabel : ec.DefineLabel ();
// Optimize small ranges using simple equality check
if (kb.Range <= 2) {
foreach (var key in kb.label_values) {
SwitchLabel sl = labels[key];
- if (sl.Converted.IsDefaultValue) {
+ if (sl == case_default || sl == case_null)
+ continue;
+
+ if (sl.Converted.IsZeroInteger) {
val.EmitBranchable (ec, sl.GetILLabel (ec), false);
} else {
val.Emit (ec);
if (ranges.Count > 0)
ec.Emit (OpCodes.Br, lbl_default);
}
-
- // now emit the code for the sections
- bool found_default = false;
-
- foreach (SwitchSection ss in Sections) {
- foreach (SwitchLabel sl in ss.Labels) {
- if (sl.IsDefault) {
- ec.MarkLabel (lbl_default);
- found_default = true;
- if (null_section == null)
- ec.MarkLabel (null_target);
- } else if (sl.Converted.IsNull) {
- ec.MarkLabel (null_target);
- }
-
- ec.MarkLabel (sl.GetILLabel (ec));
- }
-
- ss.Block.Emit (ec);
- }
-
- if (!found_default) {
- ec.MarkLabel (lbl_default);
- if (null_section == null) {
- ec.MarkLabel (null_target);
- }
- }
}
-
+
SwitchLabel FindLabel (Constant value)
{
SwitchLabel sl = null;
if (string_labels != null) {
string s = value.GetValue () as string;
if (s == null) {
- if (null_section != null)
- sl = null_section;
- else if (default_section != null)
- sl = default_section.Labels[0];
+ if (case_null != null)
+ sl = case_null;
+ else if (case_default != null)
+ sl = case_default;
} else {
string_labels.TryGetValue (s, out sl);
}
} else {
if (value is NullLiteral) {
- sl = null_section;
+ sl = case_null;
} else {
labels.TryGetValue (value.GetValueAsLong (), out sl);
}
return sl;
}
- SwitchSection FindSection (SwitchLabel label)
- {
- foreach (SwitchSection ss in Sections){
- foreach (SwitchLabel sl in ss.Labels){
- if (label == sl)
- return ss;
- }
- }
-
- return null;
- }
-
public override bool Resolve (BlockContext ec)
{
Expr = Expr.Resolve (ec);
new_expr = SwitchGoverningType (ec, unwrap);
}
- if (new_expr == null){
- ec.Report.Error (151, loc,
- "A switch expression of type `{0}' cannot be converted to an integral type, bool, char, string, enum or nullable type",
- TypeManager.CSharpName (Expr.Type));
+ if (new_expr == null) {
+ if (Expr.Type != InternalType.ErrorType) {
+ ec.Report.Error (151, loc,
+ "A switch expression of type `{0}' cannot be converted to an integral type, bool, char, string, enum or nullable type",
+ Expr.Type.GetSignatureForError ());
+ }
+
return false;
}
return false;
}
- if (!CheckSwitch (ec))
- return false;
+ if (block.Statements.Count == 0)
+ return true;
- Switch old_switch = ec.Switch;
- ec.Switch = this;
- ec.Switch.SwitchType = SwitchType;
+ if (SwitchType.BuiltinType == BuiltinTypeSpec.Type.String) {
+ string_labels = new Dictionary<string, SwitchLabel> ();
+ } else {
+ labels = new Dictionary<long, SwitchLabel> ();
+ }
- ec.StartFlowBranching (FlowBranching.BranchingType.Switch, loc);
+ case_labels = new List<SwitchLabel> ();
var constant = new_expr as Constant;
- if (constant != null) {
- is_constant = true;
- SwitchLabel label = FindLabel (constant);
- if (label != null)
- constant_section = FindSection (label);
- if (constant_section == null)
- constant_section = default_section;
- } else {
+ //
+ // Don't need extra variable for constant switch or switch with
+ // only default case
+ //
+ if (constant == null) {
//
- // Store switch expression for comparission purposes
+ // Store switch expression for comparison purposes
//
value = new_expr as VariableReference;
- if (value == null)
+ if (value == null && !HasOnlyDefaultSection ()) {
+ var current_block = ec.CurrentBlock;
+ ec.CurrentBlock = Block;
+ // Create temporary variable inside switch scope
value = TemporaryVariableReference.Create (SwitchType, ec.CurrentBlock, loc);
+ value.Resolve (ec);
+ ec.CurrentBlock = current_block;
+ }
}
- bool first = true;
- bool ok = true;
- foreach (SwitchSection ss in Sections){
- if (!first)
- ec.CurrentBranching.CreateSibling (
- null, FlowBranching.SiblingType.SwitchSection);
- else
- first = false;
+ Switch old_switch = ec.Switch;
+ ec.Switch = this;
+ ec.Switch.SwitchType = SwitchType;
- if (is_constant && (ss != constant_section)) {
- // If we're a constant switch, we're only emitting
- // one single section - mark all the others as
- // unreachable.
- ec.CurrentBranching.CurrentUsageVector.Goto ();
- if (!ss.Block.ResolveUnreachable (ec, true)) {
- ok = false;
- }
- } else {
- if (!ss.Block.Resolve (ec))
- ok = false;
- }
- }
+ ec.StartFlowBranching (FlowBranching.BranchingType.Switch, loc);
+
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+
+ var ok = block.Resolve (ec);
- if (default_section == null)
+ if (case_default == null)
ec.CurrentBranching.CreateSibling (null, FlowBranching.SiblingType.SwitchSection);
- ec.EndFlowBranching ();
+ if (ec.IsUnreachable)
+ ec.KillFlowBranching ();
+ else
+ ec.EndFlowBranching ();
+
ec.Switch = old_switch;
- if (!ok)
- return false;
+ //
+ // Check if all goto cases are valid. Needs to be done after switch
+ // is resolved becuase goto can jump forward in the scope.
+ //
+ if (goto_cases != null) {
+ foreach (var gc in goto_cases) {
+ if (gc.Item1 == null) {
+ if (DefaultLabel == null) {
+ FlowBranchingBlock.Error_UnknownLabel (loc, "default", ec.Report);
+ }
- if (!is_constant) {
- if (SwitchType.BuiltinType == BuiltinTypeSpec.Type.String) {
- if (string_labels.Count < 7)
- ResolveSimpleSwitch (ec);
- else
- ResolveStringSwitchMap (ec);
- } else if (labels.Count < 3 && !IsNullable) {
- ResolveSimpleSwitch (ec);
+ continue;
+ }
+
+ var sl = FindLabel (gc.Item2);
+ if (sl == null) {
+ FlowBranchingBlock.Error_UnknownLabel (loc, "case " + gc.Item2.GetValueAsLiteral (), ec.Report);
+ } else {
+ gc.Item1.Label = sl;
+ }
}
}
- return true;
- }
+ if (constant != null) {
+ ResolveUnreachableSections (ec, constant);
+ }
- public SwitchLabel ResolveGotoCase (ResolveContext rc, Constant value)
- {
- var sl = FindLabel (value);
+ if (!ok)
+ return false;
- if (sl == null) {
- FlowBranchingBlock.Error_UnknownLabel (loc, "case " + value.GetValueAsLiteral (), rc.Report);
+ if (constant == null && SwitchType.BuiltinType == BuiltinTypeSpec.Type.String && string_labels.Count > 6) {
+ ResolveStringSwitchMap (ec);
}
- return sl;
+ //
+ // Anonymous storey initialization has to happen before
+ // any generated switch dispatch
+ //
+ block.InsertStatement (0, new DispatchStatement (this));
+
+ return true;
}
- //
- // Prepares switch using simple if/else comparison for small label count (4 + optional default)
- //
- void ResolveSimpleSwitch (BlockContext bc)
+ bool HasOnlyDefaultSection ()
{
- simple_stmt = default_section != null ? default_section.Block : null;
-
- for (int i = Sections.Count - 1; i >= 0; --i) {
- var s = Sections[i];
+ for (int i = 0; i < block.Statements.Count; ++i) {
+ var s = block.Statements[i] as SwitchLabel;
- if (s == default_section) {
- s.Block.AddScopeStatement (new LabelMarker (this, s.Labels));
+ if (s == null || s.IsDefault)
continue;
- }
- s.Block.AddScopeStatement (new LabelMarker (this, s.Labels));
-
- Expression cond = null;
- for (int ci = 0; ci < s.Labels.Count; ++ci) {
- var e = new Binary (Binary.Operator.Equality, value, s.Labels[ci].Converted);
+ return false;
+ }
- if (ci > 0) {
- cond = new Binary (Binary.Operator.LogicalOr, cond, e);
- } else {
- cond = e;
- }
- }
+ return true;
+ }
- //
- // Compiler generated, hide from symbol file
- //
- simple_stmt = new If (cond, s.Block, simple_stmt, Location.Null);
- }
+ public void RegisterGotoCase (GotoCase gotoCase, Constant value)
+ {
+ if (goto_cases == null)
+ goto_cases = new List<Tuple<GotoCase, Constant>> ();
- // It's null for empty switch
- if (simple_stmt != null)
- simple_stmt.Resolve (bc);
+ goto_cases.Add (Tuple.Create (gotoCase, value));
}
//
ctype.AddField (field);
var init = new List<Expression> ();
- int counter = 0;
+ int counter = -1;
labels = new Dictionary<long, SwitchLabel> (string_labels.Count);
string value = null;
- foreach (SwitchSection section in Sections) {
- bool contains_label = false;
- foreach (SwitchLabel sl in section.Labels) {
- if (sl.IsDefault || sl.Converted.IsNull)
- continue;
- if (!contains_label) {
- labels.Add (counter, sl);
- contains_label = true;
- }
+ foreach (SwitchLabel sl in case_labels) {
- value = (string) sl.Converted.GetValue ();
- var init_args = new List<Expression> (2);
- init_args.Add (new StringLiteral (ec.BuiltinTypes, value, sl.Location));
+ if (sl.SectionStart)
+ labels.Add (++counter, sl);
- sl.Converted = new IntConstant (ec.BuiltinTypes, counter, loc);
- init_args.Add (sl.Converted);
+ if (sl == case_default || sl == case_null)
+ continue;
- init.Add (new CollectionElementInitializer (init_args, loc));
- }
+ value = (string) sl.Converted.GetValue ();
+ var init_args = new List<Expression> (2);
+ init_args.Add (new StringLiteral (ec.BuiltinTypes, value, sl.Location));
- //
- // Don't add empty sections
- //
- if (contains_label)
- ++counter;
- }
+ sl.Converted = new IntConstant (ec.BuiltinTypes, counter, loc);
+ init_args.Add (sl.Converted);
+ init.Add (new CollectionElementInitializer (init_args, loc));
+ }
+
Arguments args = new Arguments (1);
args.Add (new Argument (new IntConstant (ec.BuiltinTypes, init.Count, loc)));
Expression initializer = new NewInitialize (string_dictionary_type, args,
string_dictionary = new SimpleAssign (switch_cache_field, initializer.Resolve (ec));
}
+ void ResolveUnreachableSections (BlockContext bc, Constant value)
+ {
+ var constant_label = FindLabel (value) ?? case_default;
+
+ bool found = false;
+ bool unreachable_reported = false;
+ for (int i = 0; i < block.Statements.Count; ++i) {
+ var s = block.Statements[i];
+
+ if (s is SwitchLabel) {
+ if (unreachable_reported) {
+ found = unreachable_reported = false;
+ }
+
+ found |= s == constant_label;
+ continue;
+ }
+
+ if (found) {
+ unreachable_reported = true;
+ continue;
+ }
+
+ if (!unreachable_reported) {
+ unreachable_reported = true;
+ if (!bc.IsUnreachable) {
+ bc.Report.Warning (162, 2, s.loc, "Unreachable code detected");
+ }
+ }
+
+ block.Statements[i] = new EmptyStatement (s.loc);
+ }
+ }
+
void DoEmitStringSwitch (EmitContext ec)
{
Label l_initialized = ec.DefineLabel ();
//
// Skip initialization when value is null
//
- value.EmitBranchable (ec, null_target, false);
+ value.EmitBranchable (ec, nullLabel, false);
//
// Check if string dictionary is initialized and initialize
//
// A value was not found, go to default case
//
- get_item.EmitBranchable (ec, default_target, false);
+ get_item.EmitBranchable (ec, defaultLabel, false);
} else {
Arguments get_value_args = new Arguments (1);
get_value_args.Add (new Argument (value));
LocalTemporary get_item_object = new LocalTemporary (ec.BuiltinTypes.Object);
get_item_object.EmitAssign (ec, get_item, true, false);
- ec.Emit (OpCodes.Brfalse, default_target);
+ ec.Emit (OpCodes.Brfalse, defaultLabel);
ExpressionStatement get_item_int = (ExpressionStatement) new SimpleAssign (string_switch_variable,
new Cast (new TypeExpression (ec.BuiltinTypes.Int, loc), get_item_object, loc)).Resolve (rc);
string_switch_variable.Release (ec);
}
- protected override void DoEmit (EmitContext ec)
+ //
+ // Emits switch using simple if/else comparison for small label count (4 + optional default)
+ //
+ void EmitShortSwitch (EmitContext ec)
{
- // Workaround broken flow-analysis
- block.HasUnreachableClosingBrace = true;
+ MethodSpec equal_method = null;
+ if (SwitchType.BuiltinType == BuiltinTypeSpec.Type.String) {
+ equal_method = ec.Module.PredefinedMembers.StringEqual.Resolve (loc);
+ }
- //
- // Needed to emit anonymous storey initialization
- // Otherwise it does not contain any statements for now
- //
- block.Emit (ec);
+ if (equal_method != null) {
+ value.EmitBranchable (ec, nullLabel, false);
+ }
+
+ for (int i = 0; i < case_labels.Count; ++i) {
+ var label = case_labels [i];
+ if (label == case_default || label == case_null)
+ continue;
- default_target = ec.DefineLabel ();
- null_target = ec.DefineLabel ();
+ var constant = label.Converted;
- if (IsNullable) {
- unwrap.EmitCheck (ec);
- ec.Emit (OpCodes.Brfalse, null_target);
- value.EmitAssign (ec, new_expr, false, false);
- } else if (new_expr != value && !is_constant) {
- value.EmitAssign (ec, new_expr, false, false);
+ if (equal_method != null) {
+ value.Emit (ec);
+ constant.Emit (ec);
+
+ var call = new CallEmitter ();
+ call.EmitPredefined (ec, equal_method, new Arguments (0));
+ ec.Emit (OpCodes.Brtrue, label.GetILLabel (ec));
+ continue;
+ }
+
+ if (constant.IsZeroInteger && constant.Type.BuiltinType != BuiltinTypeSpec.Type.Long && constant.Type.BuiltinType != BuiltinTypeSpec.Type.ULong) {
+ value.EmitBranchable (ec, label.GetILLabel (ec), false);
+ continue;
+ }
+
+ value.Emit (ec);
+ constant.Emit (ec);
+ ec.Emit (OpCodes.Beq, label.GetILLabel (ec));
}
+ ec.Emit (OpCodes.Br, defaultLabel);
+ }
+
+ void EmitDispatch (EmitContext ec)
+ {
+ if (value == null) {
+ //
+ // Constant switch, we already done the work
+ //
+ return;
+ }
+
+ if (string_dictionary != null) {
+ DoEmitStringSwitch (ec);
+ } else if (case_labels.Count < 4 || string_labels != null) {
+ EmitShortSwitch (ec);
+ } else {
+ EmitTableSwitch (ec, value);
+ }
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ // Workaround broken flow-analysis
+ block.HasUnreachableClosingBrace = true;
+
//
// Setup the codegen context
//
Label old_end = ec.LoopEnd;
Switch old_switch = ec.Switch;
-
+
ec.LoopEnd = ec.DefineLabel ();
ec.Switch = this;
- // Emit Code.
- if (is_constant) {
- if (constant_section != null)
- constant_section.Block.Emit (ec);
- } else if (string_dictionary != null) {
- DoEmitStringSwitch (ec);
- } else if (simple_stmt != null) {
- simple_stmt.Emit (ec);
- } else {
- EmitTableSwitch (ec, value);
+ defaultLabel = case_default == null ? ec.LoopEnd : case_default.GetILLabel (ec);
+ nullLabel = case_null == null ? defaultLabel : case_null.GetILLabel (ec);
+
+ if (value != null) {
+ ec.Mark (loc);
+ if (IsNullable) {
+ unwrap.EmitCheck (ec);
+ ec.Emit (OpCodes.Brfalse, nullLabel);
+ value.EmitAssign (ec, new_expr, false, false);
+ } else if (new_expr != value) {
+ value.EmitAssign (ec, new_expr, false, false);
+ }
+
+
+ //
+ // Next statement is compiler generated we don't need extra
+ // nop when we can use the statement for sequence point
+ //
+ ec.Mark (block.StartLocation);
+ block.IsCompilerGenerated = true;
}
+ block.Emit (ec);
+
// Restore context state.
ec.MarkLabel (ec.LoopEnd);
Switch target = (Switch) t;
target.Expr = Expr.Clone (clonectx);
- target.Sections = new List<SwitchSection> ();
- foreach (SwitchSection ss in Sections){
- target.Sections.Add (ss.Clone (clonectx));
- }
+ target.block = (ExplicitBlock) block.Clone (clonectx);
}
public override object Accept (StructuralVisitor visitor)
if (finally_host != null) {
finally_host.Define ();
+ finally_host.PrepareEmit ();
finally_host.Emit ();
// Now it's safe to add, to close it properly and emit sequence points
{
LocalVariable pinned_string;
- public StringEmitter (Expression expr, LocalVariable li, Location loc)
+ public StringEmitter (Expression expr, LocalVariable li)
: base (expr, li)
{
}
}
}
- public class VariableDeclaration : BlockVariableDeclaration
+ public class VariableDeclaration : BlockVariable
{
public VariableDeclaration (FullNamedExpression type, LocalVariable li)
: base (type, li)
// Case 2: string
//
if (initializer.Type.BuiltinType == BuiltinTypeSpec.Type.String) {
- return new StringEmitter (initializer, li, loc).Resolve (bc);
+ return new StringEmitter (initializer, li).Resolve (bc);
}
// Case 3: fixed buffer
}
}
- public BlockVariableDeclaration Variables {
+ public BlockVariable Variables {
get {
return decl;
}
{
TryFinally target = (TryFinally) t;
- target.stmt = (Statement) stmt.Clone (clonectx);
+ target.stmt = stmt.Clone (clonectx);
if (fini != null)
target.fini = clonectx.LookupBlock (fini);
}
public class Using : TryFinallyBlock
{
- public class VariableDeclaration : BlockVariableDeclaration
+ public class VariableDeclaration : BlockVariable
{
Statement dispose_call;
}
}
- public BlockVariableDeclaration Variables {
+ public BlockVariable Variables {
get {
return decl;
}
if (mg != null) {
mg.InstanceExpression = expr;
Arguments args = new Arguments (0);
- mg = mg.OverloadResolve (rc, ref args, this, OverloadResolver.Restrictions.None);
+ mg = mg.OverloadResolve (rc, ref args, this, OverloadResolver.Restrictions.ProbingOnly);
// For ambiguous GetEnumerator name warning CS0278 was reported, but Option 2 could still apply
if (ambiguous_getenumerator_name)
if (!gen_ienumerable.Define ())
gen_ienumerable = null;
- do {
- var ifaces = t.Interfaces;
- if (ifaces != null) {
- foreach (var iface in ifaces) {
- if (gen_ienumerable != null && iface.MemberDefinition == gen_ienumerable.TypeSpec.MemberDefinition) {
- if (iface_candidate != null && iface_candidate != rc.Module.PredefinedMembers.IEnumerableGetEnumerator) {
- rc.Report.SymbolRelatedToPreviousError (expr.Type);
- rc.Report.Error (1640, loc,
- "foreach statement cannot operate on variables of type `{0}' because it contains multiple implementation of `{1}'. Try casting to a specific implementation",
- expr.Type.GetSignatureForError (), gen_ienumerable.TypeSpec.GetSignatureForError ());
-
- return null;
- }
+ var ifaces = t.Interfaces;
+ if (ifaces != null) {
+ foreach (var iface in ifaces) {
+ if (gen_ienumerable != null && iface.MemberDefinition == gen_ienumerable.TypeSpec.MemberDefinition) {
+ if (iface_candidate != null && iface_candidate != rc.Module.PredefinedMembers.IEnumerableGetEnumerator) {
+ rc.Report.SymbolRelatedToPreviousError (expr.Type);
+ rc.Report.Error (1640, loc,
+ "foreach statement cannot operate on variables of type `{0}' because it contains multiple implementation of `{1}'. Try casting to a specific implementation",
+ expr.Type.GetSignatureForError (), gen_ienumerable.TypeSpec.GetSignatureForError ());
+
+ return null;
+ }
- // TODO: Cache this somehow
- iface_candidate = new PredefinedMember<MethodSpec> (rc.Module, iface,
- MemberFilter.Method ("GetEnumerator", 0, ParametersCompiled.EmptyReadOnlyParameters, null));
+ // TODO: Cache this somehow
+ iface_candidate = new PredefinedMember<MethodSpec> (rc.Module, iface,
+ MemberFilter.Method ("GetEnumerator", 0, ParametersCompiled.EmptyReadOnlyParameters, null));
- continue;
- }
+ continue;
+ }
- if (iface.BuiltinType == BuiltinTypeSpec.Type.IEnumerable && iface_candidate == null) {
- iface_candidate = rc.Module.PredefinedMembers.IEnumerableGetEnumerator;
- }
+ if (iface.BuiltinType == BuiltinTypeSpec.Type.IEnumerable && iface_candidate == null) {
+ iface_candidate = rc.Module.PredefinedMembers.IEnumerableGetEnumerator;
}
}
-
- if (t.IsGenericParameter)
- t = t.BaseType;
- else
- t = null;
-
- } while (t != null);
+ }
if (iface_candidate == null) {
if (expr.Type != InternalType.ErrorType) {
protected override void DoEmit (EmitContext ec)
{
- variable.CreateBuilder (ec);
-
Label old_begin = ec.LoopBegin, old_end = ec.LoopEnd;
ec.LoopBegin = ec.DefineLabel ();
ec.LoopEnd = ec.DefineLabel ();
+ if (!(statement is Block))
+ ec.BeginCompilerScope ();
+
+ variable.CreateBuilder (ec);
+
statement.Emit (ec);
+ if (!(statement is Block))
+ ec.EndScope ();
+
ec.LoopBegin = old_begin;
ec.LoopEnd = old_end;
}
projects / mono.git / blobdiff