namespace Mono.CSharp {
+ /// <summary>
+ /// Abstract base class for type parameter constraints.
+ /// The type parameter can come from a generic type definition or from reflection.
+ /// </summary>
public abstract class GenericConstraints {
+ public abstract string TypeParameter {
+ get;
+ }
+
public abstract GenericParameterAttributes Attributes {
get;
}
}
public bool HasValueTypeConstraint {
- get { return (Attributes & GenericParameterAttributes.ValueTypeConstraint) != 0; }
+ get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
}
public virtual bool HasClassConstraint {
ValueType
}
- //
- // Tracks the constraints for a type parameter
- //
+ /// <summary>
+ /// Tracks the constraints for a type parameter from a generic type definition.
+ /// </summary>
public class Constraints : GenericConstraints {
string name;
ArrayList constraints;
this.loc = loc;
}
- public string TypeParameter {
+ public override string TypeParameter {
get {
return name;
}
TypeExpr class_constraint;
ArrayList iface_constraints;
ArrayList type_param_constraints;
- int num_constraints, first_constraint;
+ int num_constraints;
Type class_constraint_type;
Type[] iface_constraint_types;
Type effective_base_type;
+ bool resolved;
+ bool resolved_types;
+ /// <summary>
+ /// Resolve the constraints - but only resolve things into Expression's, not
+ /// into actual types.
+ /// </summary>
public bool Resolve (EmitContext ec)
{
+ if (resolved)
+ return true;
+
iface_constraints = new ArrayList ();
type_param_constraints = new ArrayList ();
if (sc == SpecialConstraint.ReferenceType)
attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
else
- attrs |= GenericParameterAttributes.ValueTypeConstraint;
+ attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
continue;
}
+ int errors = Report.Errors;
+ FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec);
+
+ if (fn == null) {
+ if (errors != Report.Errors)
+ return false;
+
+ Report.Error (246, loc, "Cannot find type '{0}'", ((Expression) obj).GetSignatureForError ());
+ return false;
+ }
+
TypeExpr expr;
- if (obj is ConstructedType) {
- ConstructedType cexpr = (ConstructedType) obj;
+ ConstructedType cexpr = fn as ConstructedType;
+ if (cexpr != null) {
if (!cexpr.ResolveConstructedType (ec))
return false;
+
expr = cexpr;
} else
- expr = ((Expression) obj).ResolveAsTypeTerminal (ec);
+ expr = fn.ResolveAsTypeTerminal (ec);
- if (expr == null)
+ if ((expr == null) || (expr.Type == null))
return false;
TypeParameterExpr texpr = expr as TypeParameterExpr;
num_constraints++;
}
+ ArrayList list = new ArrayList ();
+ foreach (TypeExpr iface_constraint in iface_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (iface_constraint.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", iface_constraint.GetSignatureForError (),
+ name);
+ return false;
+ }
+
+ list.Add (iface_constraint.Type);
+ }
+
+ foreach (TypeParameterExpr expr in type_param_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (expr.Type))
+ continue;
+
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", expr.GetSignatureForError (), name);
+ return false;
+ }
+
+ list.Add (expr.Type);
+ }
+
+ iface_constraint_types = new Type [list.Count];
+ list.CopyTo (iface_constraint_types, 0);
+
+ if (class_constraint != null) {
+ class_constraint_type = class_constraint.Type;
+ if (class_constraint_type == null)
+ return false;
+
+ if (class_constraint_type.IsSealed) {
+ Report.Error (701, loc,
+ "`{0}' is not a valid bound. Bounds " +
+ "must be interfaces or non sealed " +
+ "classes", TypeManager.CSharpName (class_constraint_type));
+ return false;
+ }
+
+ if ((class_constraint_type == TypeManager.array_type) ||
+ (class_constraint_type == TypeManager.delegate_type) ||
+ (class_constraint_type == TypeManager.enum_type) ||
+ (class_constraint_type == TypeManager.value_type) ||
+ (class_constraint_type == TypeManager.object_type)) {
+ Report.Error (702, loc,
+ "Bound cannot be special class `{0}'",
+ TypeManager.CSharpName (class_constraint_type));
+ return false;
+ }
+ }
+
+ if (class_constraint_type != null)
+ effective_base_type = class_constraint_type;
+ else if (HasValueTypeConstraint)
+ effective_base_type = TypeManager.value_type;
+ else
+ effective_base_type = TypeManager.object_type;
+
+ resolved = true;
return true;
}
return true;
}
+ /// <summary>
+ /// Resolve the constraints into actual types.
+ /// </summary>
public bool ResolveTypes (EmitContext ec)
{
- if (effective_base_type != null)
+ if (resolved_types)
return true;
+ resolved_types = true;
+
foreach (object obj in constraints) {
ConstructedType cexpr = obj as ConstructedType;
if (cexpr == null)
return false;
}
- ArrayList list = new ArrayList ();
-
foreach (TypeExpr iface_constraint in iface_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (iface_constraint.Type))
- continue;
-
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", iface_constraint.Type,
- name);
- return false;
- }
-
- list.Add (iface_constraint.Type);
- }
-
- foreach (TypeParameterExpr expr in type_param_constraints) {
- foreach (Type type in list) {
- if (!type.Equals (expr.Type))
- continue;
-
- Report.Error (405, loc,
- "Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", expr.Type, name);
+ if (iface_constraint.ResolveType (ec) == null)
return false;
- }
-
- list.Add (expr.Type);
}
- iface_constraint_types = new Type [list.Count];
- list.CopyTo (iface_constraint_types, 0);
-
if (class_constraint != null) {
- class_constraint_type = class_constraint.Type;
- if (class_constraint_type == null)
- return false;
-
- if (class_constraint_type.IsSealed) {
- Report.Error (701, loc,
- "`{0}' is not a valid bound. Bounds " +
- "must be interfaces or non sealed " +
- "classes", class_constraint_type);
- return false;
- }
-
- if ((class_constraint_type == TypeManager.array_type) ||
- (class_constraint_type == TypeManager.delegate_type) ||
- (class_constraint_type == TypeManager.enum_type) ||
- (class_constraint_type == TypeManager.value_type) ||
- (class_constraint_type == TypeManager.object_type)) {
- Report.Error (702, loc,
- "Bound cannot be special class `{0}'",
- class_constraint_type);
+ if (class_constraint.ResolveType (ec) == null)
return false;
- }
}
- if (class_constraint_type != null)
- effective_base_type = class_constraint_type;
- else if (HasValueTypeConstraint)
- effective_base_type = TypeManager.value_type;
- else
- effective_base_type = TypeManager.object_type;
-
return true;
}
+ /// <summary>
+ /// Check whether there are no conflicts in our type parameter constraints.
+ ///
+ /// This is an example:
+ ///
+ /// class Foo<T,U>
+ /// where T : class
+ /// where U : T, struct
+ /// </summary>
public bool CheckDependencies (EmitContext ec)
{
foreach (TypeParameterExpr expr in type_param_constraints) {
if (HasValueTypeConstraint && constraints.HasClassConstraint) {
Report.Error (455, loc, "Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
- name, constraints.ClassConstraint,
+ name, TypeManager.CSharpName (constraints.ClassConstraint),
"System.ValueType");
return false;
}
Report.Error (455, loc,
"Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
- name, t1, t2);
+ name, TypeManager.CSharpName (t1), TypeManager.CSharpName (t2));
return false;
}
}
return true;
}
- public void Define (GenericTypeParameterBuilder type)
- {
- type.SetGenericParameterAttributes (attrs);
- }
-
public override GenericParameterAttributes Attributes {
get { return attrs; }
}
get { return effective_base_type; }
}
- internal bool IsSubclassOf (Type t)
+ public bool IsSubclassOf (Type t)
{
if ((class_constraint_type != null) &&
class_constraint_type.IsSubclassOf (t))
return false;
}
+ /// <summary>
+ /// This is used when we're implementing a generic interface method.
+ /// Each method type parameter in implementing method must have the same
+ /// constraints than the corresponding type parameter in the interface
+ /// method. To do that, we're called on each of the implementing method's
+ /// type parameters.
+ /// </summary>
public bool CheckInterfaceMethod (EmitContext ec, GenericConstraints gc)
{
if (gc.Attributes != attrs)
}
}
- //
- // This type represents a generic type parameter
- //
+ /// <summary>
+ /// A type parameter from a generic type definition.
+ /// </summary>
public class TypeParameter : MemberCore, IMemberContainer {
string name;
+ DeclSpace decl;
GenericConstraints gc;
Constraints constraints;
Location loc;
GenericTypeParameterBuilder type;
- public TypeParameter (TypeContainer parent, string name,
- Constraints constraints, Location loc)
- : base (parent, new MemberName (name), null, loc)
+ public TypeParameter (TypeContainer parent, DeclSpace decl, string name,
+ Constraints constraints, Attributes attrs, Location loc)
+ : base (parent, new MemberName (name, loc), attrs)
{
this.name = name;
+ this.decl = decl;
this.constraints = constraints;
this.loc = loc;
}
}
}
- public Type Type {
+ public DeclSpace DeclSpace {
get {
- return type;
+ return decl;
}
}
- public bool Resolve (DeclSpace ds)
- {
- if (constraints != null) {
- if (!constraints.Resolve (ds.EmitContext)) {
- constraints = null;
- return false;
- }
+ public Type Type {
+ get {
+ return type;
}
-
- return true;
}
+ /// <summary>
+ /// This is the first method which is called during the resolving
+ /// process; we're called immediately after creating the type parameters
+ /// with SRE (by calling `DefineGenericParameters()' on the TypeBuilder /
+ /// MethodBuilder).
+ ///
+ /// We're either called from TypeContainer.DefineType() or from
+ /// GenericMethod.Define() (called from Method.Define()).
+ /// </summary>
public void Define (GenericTypeParameterBuilder type)
{
if (this.type != null)
TypeManager.AddTypeParameter (type, this);
}
- public void DefineConstraints ()
+ /// <summary>
+ /// This is the second method which is called during the resolving
+ /// process - in case of class type parameters, we're called from
+ /// TypeContainer.ResolveType() - after it resolved the class'es
+ /// base class and interfaces. For method type parameters, we're
+ /// called immediately after Define().
+ ///
+ /// We're just resolving the constraints into expressions here, we
+ /// don't resolve them into actual types.
+ ///
+ /// Note that in the special case of partial generic classes, we may be
+ /// called _before_ Define() and we may also be called multiple types.
+ /// </summary>
+ public bool Resolve (DeclSpace ds)
{
- if (constraints != null)
- constraints.Define (type);
+ if (constraints != null) {
+ if (!constraints.Resolve (ds.EmitContext)) {
+ constraints = null;
+ return false;
+ }
+ }
+
+ return true;
}
+ /// <summary>
+ /// This is the third method which is called during the resolving
+ /// process. We're called immediately after calling DefineConstraints()
+ /// on all of the current class'es type parameters.
+ ///
+ /// Our job is to resolve the constraints to actual types.
+ ///
+ /// Note that we may have circular dependencies on type parameters - this
+ /// is why Resolve() and ResolveType() are separate.
+ /// </summary>
public bool ResolveType (EmitContext ec)
{
if (constraints != null) {
return true;
}
+ /// <summary>
+ /// This is the fourth and last method which is called during the resolving
+ /// process. We're called after everything is fully resolved and actually
+ /// register the constraints with SRE and the TypeManager.
+ /// </summary>
public bool DefineType (EmitContext ec)
{
return DefineType (ec, null, null, false);
}
+ /// <summary>
+ /// This is the fith and last method which is called during the resolving
+ /// process. We're called after everything is fully resolved and actually
+ /// register the constraints with SRE and the TypeManager.
+ ///
+ /// The `builder', `implementing' and `is_override' arguments are only
+ /// applicable to method type parameters.
+ /// </summary>
public bool DefineType (EmitContext ec, MethodBuilder builder,
MethodInfo implementing, bool is_override)
{
mb = mb.GetGenericMethodDefinition ();
int pos = type.GenericParameterPosition;
- ParameterData pd = Invocation.GetParameterData (mb);
- GenericConstraints temp_gc = pd.GenericConstraints (pos);
Type mparam = mb.GetGenericArguments () [pos];
+ GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
if (temp_gc != null)
gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
425, loc, "The constraints for type " +
"parameter `{0}' of method `{1}' must match " +
"the constraints for type parameter `{2}' " +
- "of interface method `{3}'. Consider using " +
+ "of interface method `{3}'. Consider using " +
"an explicit interface implementation instead",
Name, TypeManager.CSharpSignature (builder),
- mparam, TypeManager.CSharpSignature (mb));
+ TypeManager.CSharpName (mparam), TypeManager.CSharpSignature (mb));
return false;
}
+ } else if (DeclSpace is Iterator) {
+ TypeParameter[] tparams = DeclSpace.TypeParameters;
+ Type[] types = new Type [tparams.Length];
+ for (int i = 0; i < tparams.Length; i++)
+ types [i] = tparams [i].Type;
+
+ if (constraints != null)
+ gc = new InflatedConstraints (constraints, types);
} else {
gc = (GenericConstraints) constraints;
}
type.SetBaseTypeConstraint (gc.ClassConstraint);
type.SetInterfaceConstraints (gc.InterfaceConstraints);
+ type.SetGenericParameterAttributes (gc.Attributes);
TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
return true;
}
+ /// <summary>
+ /// Check whether there are no conflicts in our type parameter constraints.
+ ///
+ /// This is an example:
+ ///
+ /// class Foo<T,U>
+ /// where T : class
+ /// where U : T, struct
+ /// </summary>
public bool CheckDependencies (EmitContext ec)
{
if (constraints != null)
return true;
}
- public bool UpdateConstraints (EmitContext ec, Constraints new_constraints, bool check)
+ /// <summary>
+ /// This is called for each part of a partial generic type definition.
+ ///
+ /// If `new_constraints' is not null and we don't already have constraints,
+ /// they become our constraints. If we already have constraints, we must
+ /// check that they're the same.
+ /// con
+ /// </summary>
+ public bool UpdateConstraints (EmitContext ec, Constraints new_constraints)
{
- //
- // We're used in partial generic type definitions.
- // If `check' is false, we just encountered the first ClassPart which has
- // constraints - they become our "real" constraints.
- // Otherwise we're called after the type parameters have already been defined
- // and check whether the constraints are the same in all parts.
- //
- if (!check) {
- if (type != null)
- throw new InvalidOperationException ();
- constraints = new_constraints;
- return true;
- }
-
if (type == null)
throw new InvalidOperationException ();
- if (constraints == null)
- return new_constraints == null;
- else if (new_constraints == null)
- return false;
+ if (constraints == null) {
+ new_constraints = constraints;
+ return true;
+ } else if (new_constraints == null)
+ return true;
if (!new_constraints.Resolve (ec))
return false;
return constraints.CheckInterfaceMethod (ec, new_constraints);
}
+ public void EmitAttributes (EmitContext ec)
+ {
+ if (OptAttributes != null)
+ OptAttributes.Emit (ec, this);
+ }
+
public override string DocCommentHeader {
get {
throw new InvalidOperationException (
return true;
}
- protected override void VerifyObsoleteAttribute ()
- { }
-
public override void ApplyAttributeBuilder (Attribute a,
CustomAttributeBuilder cb)
- { }
+ {
+ type.SetCustomAttribute (cb);
+ }
public override AttributeTargets AttributeTargets {
get {
- return (AttributeTargets) 0;
+ return (AttributeTargets) AttributeTargets.GenericParameter;
}
}
public override string[] ValidAttributeTargets {
get {
- return new string [0];
+ return new string [] { "type parameter" };
}
}
members.AddRange (list);
}
- foreach (Type t in gc.InterfaceConstraints) {
+ Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
+ foreach (Type t in ifaces) {
MemberList list = TypeManager.FindMembers (
t, mt, bf, filter, criteria);
return "TypeParameter[" + name + "]";
}
+ public static string GetSignatureForError (TypeParameter[] tp)
+ {
+ if (tp == null || tp.Length == 0)
+ return "";
+
+ StringBuilder sb = new StringBuilder ("<");
+ for (int i = 0; i < tp.Length; ++i) {
+ if (i > 0)
+ sb.Append (",");
+ sb.Append (tp[i].GetSignatureForError ());
+ }
+ sb.Append ('>');
+ return sb.ToString ();
+ }
+
protected class InflatedConstraints : GenericConstraints
{
GenericConstraints gc;
Type class_constraint;
Type[] iface_constraints;
Type[] dargs;
- Type declaring;
public InflatedConstraints (GenericConstraints gc, Type declaring)
+ : this (gc, TypeManager.GetTypeArguments (declaring))
+ { }
+
+ public InflatedConstraints (GenericConstraints gc, Type[] dargs)
{
this.gc = gc;
- this.declaring = declaring;
-
- dargs = TypeManager.GetTypeArguments (declaring);
+ this.dargs = dargs;
ArrayList list = new ArrayList ();
if (gc.HasClassConstraint)
return dargs [t.GenericParameterPosition];
if (t.IsGenericInstance) {
t = t.GetGenericTypeDefinition ();
- t = t.BindGenericParameters (dargs);
+ t = t.MakeGenericType (dargs);
}
return t;
}
+ public override string TypeParameter {
+ get { return gc.TypeParameter; }
+ }
+
public override GenericParameterAttributes Attributes {
get { return gc.Attributes; }
}
}
}
- //
- // This type represents a generic type parameter reference.
- //
- // These expressions are born in a fully resolved state.
- //
+ /// <summary>
+ /// A TypeExpr which already resolved to a type parameter.
+ /// </summary>
public class TypeParameterExpr : TypeExpr {
TypeParameter type_parameter;
}
}
+ /// <summary>
+ /// Tracks the type arguments when instantiating a generic type. We're used in
+ /// ConstructedType.
+ /// </summary>
public class TypeArguments {
public readonly Location Location;
ArrayList args;
args.AddRange (new_args.args);
}
- public string[] GetDeclarations ()
+ /// <summary>
+ /// We're used during the parsing process: the parser can't distinguish
+ /// between type parameters and type arguments. Because of that, the
+ /// parser creates a `MemberName' with `TypeArguments' for both cases and
+ /// in case of a generic type definition, we call GetDeclarations().
+ /// </summary>
+ public TypeParameterName[] GetDeclarations ()
{
- string[] ret = new string [args.Count];
+ TypeParameterName[] ret = new TypeParameterName [args.Count];
for (int i = 0; i < args.Count; i++) {
+ TypeParameterName name = args [i] as TypeParameterName;
+ if (name != null) {
+ ret [i] = name;
+ continue;
+ }
SimpleName sn = args [i] as SimpleName;
if (sn != null) {
- ret [i] = sn.Name;
+ ret [i] = new TypeParameterName (sn.Name, null, sn.Location);
continue;
}
return ret;
}
+ /// <summary>
+ /// We may only be used after Resolve() is called and return the fully
+ /// resolved types.
+ /// </summary>
public Type[] Arguments {
get {
return atypes;
return s.ToString ();
}
+ /// <summary>
+ /// Resolve the type arguments.
+ /// </summary>
public bool Resolve (EmitContext ec)
{
int count = args.Count;
Report.Error (306, Location, "The type `{0}' may not be used " +
"as a type argument.", TypeManager.CSharpName (te.Type));
return false;
+ } else if (te.Type == TypeManager.void_type) {
+ Report.Error (1547, Location,
+ "Keyword `void' cannot be used in this context");
+ return false;
}
atypes [i] = te.Type;
return ok;
}
}
-
- public class ConstructedType : TypeExpr {
- string name, full_name;
- TypeArguments args;
- Type[] gen_params, atypes;
- Type gt;
-
- public ConstructedType (string name, TypeArguments args, Location l)
- {
- loc = l;
- this.name = MemberName.MakeName (name, args.Count);
- this.args = args;
- eclass = ExprClass.Type;
- full_name = name + "<" + args.ToString () + ">";
- }
+ public class TypeParameterName : SimpleName
+ {
+ Attributes attributes;
- public ConstructedType (string name, TypeParameter[] type_params, Location l)
- : this (type_params, l)
+ public TypeParameterName (string name, Attributes attrs, Location loc)
+ : base (name, loc)
{
- loc = l;
+ attributes = attrs;
+ }
- this.name = name;
- full_name = name + "<" + args.ToString () + ">";
+ public Attributes OptAttributes {
+ get {
+ return attributes;
+ }
}
+ }
+
+ /// <summary>
+ /// An instantiation of a generic type.
+ /// </summary>
+ public class ConstructedType : TypeExpr {
+ string full_name;
+ FullNamedExpression name;
+ TypeArguments args;
+ Type[] gen_params, atypes;
+ Type gt;
+ /// <summary>
+ /// Instantiate the generic type `fname' with the type arguments `args'.
+ /// </summary>
public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
{
loc = l;
- this.name = fname.FullName;
+ this.name = fname;
this.args = args;
eclass = ExprClass.Type;
eclass = ExprClass.Type;
}
+ /// <summary>
+ /// This is used to construct the `this' type inside a generic type definition.
+ /// </summary>
public ConstructedType (Type t, TypeParameter[] type_params, Location l)
: this (type_params, l)
{
gt = t.GetGenericTypeDefinition ();
- this.name = gt.FullName;
+ this.name = new TypeExpression (gt, l);
full_name = gt.FullName + "<" + args.ToString () + ">";
}
+ /// <summary>
+ /// Instantiate the generic type `t' with the type arguments `args'.
+ /// Use this constructor if you already know the fully resolved
+ /// generic type.
+ /// </summary>
public ConstructedType (Type t, TypeArguments args, Location l)
: this (args, l)
{
gt = t.GetGenericTypeDefinition ();
- this.name = gt.FullName;
+ this.name = new TypeExpression (gt, l);
full_name = gt.FullName + "<" + args.ToString () + ">";
}
get { return args; }
}
- protected string DeclarationName {
- get {
- StringBuilder sb = new StringBuilder ();
- sb.Append (gt.FullName);
- sb.Append ("<");
- for (int i = 0; i < gen_params.Length; i++) {
- if (i > 0)
- sb.Append (",");
- sb.Append (gen_params [i]);
- }
- sb.Append (">");
- return sb.ToString ();
- }
+ public override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
}
- protected bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
- Type ctype)
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
- if (TypeManager.HasGenericArguments (ctype)) {
- Type[] types = TypeManager.GetTypeArguments (ctype);
-
- TypeArguments new_args = new TypeArguments (loc);
-
- for (int i = 0; i < types.Length; i++) {
- Type t = types [i];
-
- if (t.IsGenericParameter) {
- int pos = t.GenericParameterPosition;
- t = args.Arguments [pos];
- }
- new_args.Add (new TypeExpression (t, loc));
- }
-
- TypeExpr ct = new ConstructedType (ctype, new_args, loc);
- if (ct.ResolveAsTypeTerminal (ec) == null)
- return false;
- ctype = ct.Type;
- }
+ if (!ResolveConstructedType (ec))
+ return null;
- return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
+ return this;
}
- protected bool CheckConstraints (EmitContext ec, int index)
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (EmitContext ec)
{
- Type atype = atypes [index];
- Type ptype = gen_params [index];
+ return ConstraintChecker.CheckConstraints (ec, gt, gen_params, atypes, loc);
+ }
- if (atype == ptype)
+ /// <summary>
+ /// Resolve the constructed type, but don't check the constraints.
+ /// </summary>
+ public bool ResolveConstructedType (EmitContext ec)
+ {
+ if (type != null)
+ return true;
+ // If we already know the fully resolved generic type.
+ if (gt != null)
+ return DoResolveType (ec);
+
+ int num_args;
+ Type t = name.Type;
+
+ if (t == null) {
+ Report.Error (246, loc, "Cannot find type `{0}'<...>", Name);
+ return false;
+ }
+
+ num_args = TypeManager.GetNumberOfTypeArguments (t);
+ if (num_args == 0) {
+ Report.Error (308, loc,
+ "The non-generic type `{0}' cannot " +
+ "be used with type arguments.",
+ TypeManager.CSharpName (t));
+ return false;
+ }
+
+ gt = t.GetGenericTypeDefinition ();
+ return DoResolveType (ec);
+ }
+
+ bool DoResolveType (EmitContext ec)
+ {
+ //
+ // Resolve the arguments.
+ //
+ if (args.Resolve (ec) == false)
+ return false;
+
+ gen_params = gt.GetGenericArguments ();
+ atypes = args.Arguments;
+
+ if (atypes.Length != gen_params.Length) {
+ Report.Error (305, loc,
+ "Using the generic type `{0}' " +
+ "requires {1} type arguments",
+ TypeManager.CSharpName (gt),
+ gen_params.Length.ToString ());
+ return false;
+ }
+
+ //
+ // Now bind the parameters.
+ //
+ type = gt.MakeGenericType (atypes);
+ return true;
+ }
+
+ public Expression GetSimpleName (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override bool CheckAccessLevel (DeclSpace ds)
+ {
+ return ds.CheckAccessLevel (gt);
+ }
+
+ public override bool AsAccessible (DeclSpace ds, int flags)
+ {
+ return ds.AsAccessible (gt, flags);
+ }
+
+ public override bool IsClass {
+ get { return gt.IsClass; }
+ }
+
+ public override bool IsValueType {
+ get { return gt.IsValueType; }
+ }
+
+ public override bool IsInterface {
+ get { return gt.IsInterface; }
+ }
+
+ public override bool IsSealed {
+ get { return gt.IsSealed; }
+ }
+
+ public override bool Equals (object obj)
+ {
+ ConstructedType cobj = obj as ConstructedType;
+ if (cobj == null)
+ return false;
+
+ if ((type == null) || (cobj.type == null))
+ return false;
+
+ return type == cobj.type;
+ }
+
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
+ }
+
+ public override string Name {
+ get {
+ return full_name;
+ }
+ }
+
+
+ public override string FullName {
+ get {
+ return full_name;
+ }
+ }
+ }
+
+ public abstract class ConstraintChecker
+ {
+ protected readonly Type[] gen_params;
+ protected readonly Type[] atypes;
+ protected readonly Location loc;
+
+ protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc)
+ {
+ this.gen_params = gen_params;
+ this.atypes = atypes;
+ this.loc = loc;
+ }
+
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (EmitContext ec)
+ {
+ for (int i = 0; i < gen_params.Length; i++) {
+ if (!CheckConstraints (ec, i))
+ return false;
+ }
+
+ return true;
+ }
+
+ protected bool CheckConstraints (EmitContext ec, int index)
+ {
+ Type atype = atypes [index];
+ Type ptype = gen_params [index];
+
+ if (atype == ptype)
return true;
Expression aexpr = new EmptyExpression (atype);
"a reference type in order to use it " +
"as type parameter `{1}' in the " +
"generic type or method `{2}'.",
- atype, ptype, DeclarationName);
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
return false;
} else if (gc.HasValueTypeConstraint && !is_struct) {
Report.Error (453, loc, "The type `{0}' must be " +
"a value type in order to use it " +
"as type parameter `{1}' in the " +
"generic type or method `{2}'.",
- atype, ptype, DeclarationName);
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
return false;
}
//
if (gc.HasClassConstraint) {
if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint)) {
- Report.Error (309, loc, "The type `{0}' must be " +
- "convertible to `{1}' in order to " +
- "use it as parameter `{2}' in the " +
- "generic type or method `{3}'",
- atype, gc.ClassConstraint, ptype, DeclarationName);
+ Error_TypeMustBeConvertible (atype, gc.ClassConstraint, ptype);
return false;
}
}
itype = it;
if (!CheckConstraint (ec, ptype, aexpr, itype)) {
- Report.Error (309, loc, "The type `{0}' must be " +
- "convertible to `{1}' in order to " +
- "use it as parameter `{2}' in the " +
- "generic type or method `{3}'",
- atype, itype, ptype, DeclarationName);
+ Error_TypeMustBeConvertible (atype, itype, ptype);
return false;
}
}
if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
return true;
- MethodGroupExpr mg = Expression.MemberLookup (
- ec, atype, ".ctor", MemberTypes.Constructor,
- BindingFlags.Public | BindingFlags.Instance |
- BindingFlags.DeclaredOnly, loc)
- as MethodGroupExpr;
-
- if (atype.IsAbstract || (mg == null) || !mg.IsInstance) {
- Report.Error (310, loc, "The type `{0}' must have a public " +
- "parameterless constructor in order to use it " +
- "as parameter `{1}' in the generic type or " +
- "method `{2}'", atype, ptype, DeclarationName);
- return false;
- }
+ if (HasDefaultConstructor (ec, atype))
+ return true;
- return true;
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (atype);
+ Report.Error (310, loc, "The type `{0}' must have a public " +
+ "parameterless constructor in order to use it " +
+ "as parameter `{1}' in the generic type or " +
+ "method `{2}'",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
+ return false;
}
- protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ protected bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
+ Type ctype)
{
- if (!ResolveConstructedType (ec))
- return null;
-
- return this;
- }
+ if (TypeManager.HasGenericArguments (ctype)) {
+ Type[] types = TypeManager.GetTypeArguments (ctype);
- public bool CheckConstraints (EmitContext ec)
- {
- for (int i = 0; i < gen_params.Length; i++) {
- if (!CheckConstraints (ec, i))
- return false;
- }
+ TypeArguments new_args = new TypeArguments (loc);
- return true;
- }
+ for (int i = 0; i < types.Length; i++) {
+ Type t = types [i];
- public override TypeExpr ResolveAsTypeTerminal (EmitContext ec)
- {
- if (base.ResolveAsTypeTerminal (ec) == null)
- return null;
+ if (t.IsGenericParameter) {
+ int pos = t.GenericParameterPosition;
+ t = atypes [pos];
+ }
+ new_args.Add (new TypeExpression (t, loc));
+ }
- if (!CheckConstraints (ec))
- return null;
+ TypeExpr ct = new ConstructedType (ctype, new_args, loc);
+ if (ct.ResolveAsTypeStep (ec) == null)
+ return false;
+ ctype = ct.Type;
+ }
- return this;
+ return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
}
- public bool ResolveConstructedType (EmitContext ec)
+ bool HasDefaultConstructor (EmitContext ec, Type atype)
{
- if (type != null)
- return true;
- if (gt != null)
- return DoResolveType (ec);
+ if (atype is TypeBuilder) {
+ if (atype.IsAbstract)
+ return false;
- //
- // First, resolve the generic type.
- //
- DeclSpace ds;
- Type nested = ec.DeclSpace.FindNestedType (loc, name, out ds);
- if (nested != null) {
- gt = nested.GetGenericTypeDefinition ();
+ TypeContainer tc = TypeManager.LookupTypeContainer (atype);
+ foreach (Constructor c in tc.InstanceConstructors) {
+ if ((c.ModFlags & Modifiers.PUBLIC) == 0)
+ continue;
+ if ((c.Parameters.FixedParameters != null) &&
+ (c.Parameters.FixedParameters.Length != 0))
+ continue;
+ if (c.Parameters.HasArglist || c.Parameters.HasParams)
+ continue;
- TypeArguments new_args = new TypeArguments (loc);
- if (ds.IsGeneric) {
- foreach (TypeParameter param in ds.TypeParameters)
- new_args.Add (new TypeParameterExpr (param, loc));
+ return true;
}
- new_args.Add (args);
-
- args = new_args;
- return DoResolveType (ec);
}
- Type t;
- int num_args;
-
- SimpleName sn = new SimpleName (name, loc);
- TypeExpr resolved = sn.ResolveAsTypeTerminal (ec);
- if (resolved == null)
- return false;
-
- t = resolved.Type;
- if (t == null) {
- Report.Error (246, loc, "Cannot find type `{0}'<...>",
- Basename);
- return false;
- }
+ MethodGroupExpr mg = Expression.MemberLookup (
+ ec, atype, ".ctor", MemberTypes.Constructor,
+ BindingFlags.Public | BindingFlags.Instance |
+ BindingFlags.DeclaredOnly, loc)
+ as MethodGroupExpr;
- num_args = TypeManager.GetNumberOfTypeArguments (t);
- if (num_args == 0) {
- Report.Error (308, loc,
- "The non-generic type `{0}' cannot " +
- "be used with type arguments.",
- TypeManager.CSharpName (t));
- return false;
+ if (!atype.IsAbstract && (mg != null) && mg.IsInstance) {
+ foreach (MethodBase mb in mg.Methods) {
+ ParameterData pd = TypeManager.GetParameterData (mb);
+ if (pd.Count == 0)
+ return true;
+ }
}
- gt = t.GetGenericTypeDefinition ();
- return DoResolveType (ec);
+ return false;
}
- bool DoResolveType (EmitContext ec)
- {
- //
- // Resolve the arguments.
- //
- if (args.Resolve (ec) == false)
- return false;
-
- gen_params = gt.GetGenericArguments ();
- atypes = args.Arguments;
-
- if (atypes.Length != gen_params.Length) {
- Report.Error (305, loc,
- "Using the generic type `{0}' " +
- "requires {1} type arguments",
- TypeManager.GetFullName (gt),
- gen_params.Length);
- return false;
- }
-
- //
- // Now bind the parameters.
- //
- type = gt.BindGenericParameters (atypes);
- return true;
- }
+ protected abstract string GetSignatureForError ();
+ protected abstract void Report_SymbolRelatedToPreviousError ();
- public Expression GetSimpleName (EmitContext ec)
+ void Error_TypeMustBeConvertible (Type atype, Type gc, Type ptype)
{
- return new SimpleName (Basename, args, loc);
+ Report_SymbolRelatedToPreviousError ();
+ Report.SymbolRelatedToPreviousError (atype);
+ Report.Error (309, loc,
+ "The type `{0}' must be convertible to `{1}' in order to " +
+ "use it as parameter `{2}' in the generic type or method `{3}'",
+ TypeManager.CSharpName (atype), TypeManager.CSharpName (gc),
+ TypeManager.CSharpName (ptype), GetSignatureForError ());
}
- public override bool CheckAccessLevel (DeclSpace ds)
- {
- return ds.CheckAccessLevel (gt);
- }
-
- public override bool AsAccessible (DeclSpace ds, int flags)
+ public static bool CheckConstraints (EmitContext ec, MethodBase definition,
+ MethodBase instantiated, Location loc)
{
- return ds.AsAccessible (gt, flags);
- }
-
- public override bool IsClass {
- get { return gt.IsClass; }
- }
+ MethodConstraintChecker checker = new MethodConstraintChecker (
+ definition, definition.GetGenericArguments (),
+ instantiated.GetGenericArguments (), loc);
- public override bool IsValueType {
- get { return gt.IsValueType; }
- }
-
- public override bool IsInterface {
- get { return gt.IsInterface; }
+ return checker.CheckConstraints (ec);
}
- public override bool IsSealed {
- get { return gt.IsSealed; }
- }
+ public static bool CheckConstraints (EmitContext ec, Type gt, Type[] gen_params,
+ Type[] atypes, Location loc)
+ {
+ TypeConstraintChecker checker = new TypeConstraintChecker (
+ gt, gen_params, atypes, loc);
- public override bool IsAttribute {
- get { return false; }
+ return checker.CheckConstraints (ec);
}
- public override bool Equals (object obj)
+ protected class MethodConstraintChecker : ConstraintChecker
{
- ConstructedType cobj = obj as ConstructedType;
- if (cobj == null)
- return false;
+ MethodBase definition;
- if ((type == null) || (cobj.type == null))
- return false;
+ public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
+ Type[] atypes, Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.definition = definition;
+ }
- return type == cobj.type;
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpSignature (definition);
+ }
+
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (definition);
+ }
}
- public override int GetHashCode ()
+ protected class TypeConstraintChecker : ConstraintChecker
{
- return base.GetHashCode ();
- }
+ Type gt;
- public string Basename {
- get {
- int pos = name.LastIndexOf ('`');
- if (pos >= 0)
- return name.Substring (0, pos);
- else
- return name;
+ public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
+ Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.gt = gt;
}
- }
- public override string Name {
- get {
- return full_name;
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
}
- }
-
- public override string FullName {
- get {
- return full_name;
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (gt);
}
}
}
+ /// <summary>
+ /// A generic method definition.
+ /// </summary>
public class GenericMethod : DeclSpace
{
- public GenericMethod (NamespaceEntry ns, TypeContainer parent,
- MemberName name, Location l)
- : base (ns, parent, name, null, l)
- { }
+ Expression return_type;
+ Parameters parameters;
+
+ public GenericMethod (NamespaceEntry ns, TypeContainer parent, MemberName name,
+ Expression return_type, Parameters parameters)
+ : base (ns, parent, name, null)
+ {
+ this.return_type = return_type;
+ this.parameters = parameters;
+ }
public override TypeBuilder DefineType ()
{
public override bool Define ()
{
+ ec = new EmitContext (this, this, Location, null, null, ModFlags, false);
+
for (int i = 0; i < TypeParameters.Length; i++)
- if (!TypeParameters [i].Resolve (Parent))
+ if (!TypeParameters [i].Resolve (this))
return false;
return true;
}
- public bool Define (MethodBuilder mb, Type return_type)
+ /// <summary>
+ /// Define and resolve the type parameters.
+ /// We're called from Method.Define().
+ /// </summary>
+ public bool Define (MethodBuilder mb)
{
- if (!Define ())
- return false;
-
GenericTypeParameterBuilder[] gen_params;
- string[] names = MemberName.TypeArguments.GetDeclarations ();
- gen_params = mb.DefineGenericParameters (names);
+ TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
+ string[] snames = new string [names.Length];
+ for (int i = 0; i < names.Length; i++)
+ snames [i] = names [i].Name;
+ gen_params = mb.DefineGenericParameters (snames);
for (int i = 0; i < TypeParameters.Length; i++)
TypeParameters [i].Define (gen_params [i]);
- ec = new EmitContext (
- this, this, Location, null, return_type, ModFlags, false);
+ if (!Define ())
+ return false;
for (int i = 0; i < TypeParameters.Length; i++) {
if (!TypeParameters [i].ResolveType (ec))
return true;
}
+ /// <summary>
+ /// We're called from MethodData.Define() after creating the MethodBuilder.
+ /// </summary>
public bool DefineType (EmitContext ec, MethodBuilder mb,
MethodInfo implementing, bool is_override)
{
ec, mb, implementing, is_override))
return false;
- return true;
+ bool ok = true;
+ foreach (Parameter p in parameters.FixedParameters){
+ if (!p.Resolve (ec))
+ ok = false;
+ }
+ if ((return_type != null) && (return_type.ResolveAsTypeTerminal (ec) == null))
+ ok = false;
+
+ return ok;
+ }
+
+ public void EmitAttributes (EmitContext ec)
+ {
+ for (int i = 0; i < TypeParameters.Length; i++)
+ TypeParameters [i].EmitAttributes (ec);
+
+ if (OptAttributes != null)
+ OptAttributes.Emit (ec, this);
}
public override bool DefineMembers (TypeContainer parent)
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
- // FIXME
- }
-
- protected override void VerifyObsoleteAttribute()
- {
- // FIXME
+ base.ApplyAttributeBuilder (a, cb);
}
public override AttributeTargets AttributeTargets {
public class DefaultValueExpression : Expression
{
Expression expr;
- LocalTemporary temp_storage;
public DefaultValueExpression (Expression expr, Location loc)
{
return null;
type = texpr.Type;
- if (type.IsGenericParameter || TypeManager.IsValueType (type))
- temp_storage = new LocalTemporary (ec, type);
eclass = ExprClass.Variable;
return this;
public override void Emit (EmitContext ec)
{
- if (temp_storage != null) {
+ if (type.IsGenericParameter || TypeManager.IsValueType (type)) {
+ LocalTemporary temp_storage = new LocalTemporary (ec, type);
+
temp_storage.AddressOf (ec, AddressOp.LoadStore);
ec.ig.Emit (OpCodes.Initobj, type);
temp_storage.Emit (ec);
//
// A list of core types that the compiler requires or uses
//
- static public Type new_constraint_attr_type;
static public Type activator_type;
static public Type generic_ienumerator_type;
static public Type generic_ienumerable_type;
static void InitGenericCoreTypes ()
{
- activator_type = CoreLookupType ("System.Activator");
- new_constraint_attr_type = CoreLookupType (
- "System.Runtime.CompilerServices.NewConstraintAttribute");
+ activator_type = CoreLookupType ("System", "Activator");
- generic_ienumerator_type = CoreLookupType ("System.Collections.Generic.IEnumerator", 1);
- generic_ienumerable_type = CoreLookupType ("System.Collections.Generic.IEnumerable", 1);
- generic_nullable_type = CoreLookupType ("System.Nullable", 1);
+ generic_ienumerator_type = CoreLookupType (
+ "System.Collections.Generic", "IEnumerator", 1);
+ generic_ienumerable_type = CoreLookupType (
+ "System.Collections.Generic", "IEnumerable", 1);
+ generic_nullable_type = CoreLookupType (
+ "System", "Nullable", 1);
}
static void InitGenericCodeHelpers ()
activator_type, "CreateInstance", type_arg);
}
- static Type CoreLookupType (string name, int arity)
+ static Type CoreLookupType (string ns, string name, int arity)
{
- return CoreLookupType (MemberName.MakeName (name, arity));
+ return CoreLookupType (ns, MemberName.MakeName (name, arity));
}
public static void AddTypeParameter (Type t, TypeParameter tparam)
public static TypeContainer LookupGenericTypeContainer (Type t)
{
- while (t.IsGenericInstance)
- t = t.GetGenericTypeDefinition ();
-
+ t = DropGenericTypeArguments (t);
return LookupTypeContainer (t);
}
return (TypeParameter) builder_to_type_param [t];
}
- public static bool HasConstructorConstraint (Type t)
- {
- GenericConstraints gc = GetTypeParameterConstraints (t);
- if (gc == null)
- return false;
-
- return (gc.Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0;
- }
-
public static GenericConstraints GetTypeParameterConstraints (Type t)
{
if (!t.IsGenericParameter)
if (tparam != null)
return tparam.GenericConstraints;
- return new ReflectionConstraints (t);
+ return ReflectionConstraints.GetConstraints (t);
}
public static bool IsGeneric (Type t)
public static int GetNumberOfTypeArguments (Type t)
{
+ if (t.IsGenericParameter)
+ return 0;
DeclSpace tc = LookupDeclSpace (t);
if (tc != null)
return tc.IsGeneric ? tc.CountTypeParameters : 0;
else
- return t.HasGenericArguments ? t.GetGenericArguments ().Length : 0;
+ return t.IsGenericType ? t.GetGenericArguments ().Length : 0;
}
public static Type[] GetTypeArguments (Type t)
return t.GetGenericArguments ();
}
+ public static Type DropGenericTypeArguments (Type t)
+ {
+ if (!t.IsGenericType)
+ return t;
+ // Micro-optimization: a generic typebuilder is always a generic type definition
+ if (t is TypeBuilder)
+ return t;
+ return t.GetGenericTypeDefinition ();
+ }
+
+ //
+ // Whether `array' is an array of T and `enumerator' is `IEnumerable<T>'.
+ // For instance "string[]" -> "IEnumerable<string>".
+ //
+ public static bool IsIEnumerable (Type array, Type enumerator)
+ {
+ if (!array.IsArray || !enumerator.IsGenericInstance)
+ return false;
+
+ if (enumerator.GetGenericTypeDefinition () != generic_ienumerable_type)
+ return false;
+
+ Type[] args = GetTypeArguments (enumerator);
+ return args [0] == GetElementType (array);
+ }
+
public static bool IsEqual (Type a, Type b)
{
if (a.Equals (b))
return IsEqual (b, a);
if (a.IsGenericParameter && b.IsGenericParameter) {
- if ((a.DeclaringMethod == null) || (b.DeclaringMethod == null))
+ if (a.DeclaringMethod != b.DeclaringMethod &&
+ (a.DeclaringMethod == null || b.DeclaringMethod == null))
return false;
return a.GenericParameterPosition == b.GenericParameterPosition;
}
return false;
}
- public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_infered, Type[] method_infered)
+ /// <summary>
+ /// Check whether `a' and `b' may become equal generic types.
+ /// The algorithm to do that is a little bit complicated.
+ /// </summary>
+ public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_infered,
+ Type[] method_infered)
{
if (a.IsGenericParameter) {
//
// particular instantiation (26.3.1).
//
public static bool MayBecomeEqualGenericInstances (Type a, Type b,
- Type[] class_infered, Type[] method_infered)
+ Type[] class_infered,
+ Type[] method_infered)
{
if (!a.IsGenericInstance || !b.IsGenericInstance)
return false;
}
public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
- Type[] class_infered, Type[] method_infered)
+ Type[] class_infered,
+ Type[] method_infered)
{
if (aargs.Length != bargs.Length)
return false;
return true;
}
- public static bool IsEqualGenericInstance (Type type, Type parent)
+ /// <summary>
+ /// Check whether `type' and `parent' are both instantiations of the same
+ /// generic type. Note that we do not check the type parameters here.
+ /// </summary>
+ public static bool IsInstantiationOfSameGenericType (Type type, Type parent)
{
int tcount = GetNumberOfTypeArguments (type);
int pcount = GetNumberOfTypeArguments (parent);
- if (type.IsGenericInstance)
- type = type.GetGenericTypeDefinition ();
- if (parent.IsGenericInstance)
- parent = parent.GetGenericTypeDefinition ();
-
if (tcount != pcount)
return false;
+ type = DropGenericTypeArguments (type);
+ parent = DropGenericTypeArguments (parent);
+
return type.Equals (parent);
}
- static public bool IsGenericMethod (MethodBase mb)
+ /// <summary>
+ /// Whether `mb' is a generic method definition.
+ /// </summary>
+ public static bool IsGenericMethod (MethodBase mb)
{
if (mb.DeclaringType is TypeBuilder) {
IMethodData method = (IMethodData) builder_to_method [mb];
ArrayList list = new ArrayList ();
if (at.IsGenericInstance)
list.Add (at);
- else {
- for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
- list.Add (bt);
+ for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
+ list.Add (bt);
- list.AddRange (TypeManager.GetInterfaces (at));
- }
+ list.AddRange (TypeManager.GetInterfaces (at));
bool found_one = false;
return true;
}
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from the params method
+ /// `method', which is invoked with the arguments `arguments'. This is used
+ /// when resolving an Invocation or a DelegateInvocation and the user
+ /// did not explicitly specify type arguments.
+ /// </summary>
public static bool InferParamsTypeArguments (EmitContext ec, ArrayList arguments,
ref MethodBase method)
{
else
arg_count = arguments.Count;
- ParameterData pd = Invocation.GetParameterData (method);
+ ParameterData pd = TypeManager.GetParameterData (method);
int pd_count = pd.Count;
if (infered_types [i] == null)
return false;
- method = method.BindGenericParameters (infered_types);
+ method = ((MethodInfo)method).MakeGenericMethod (infered_types);
return true;
}
- public static bool InferTypeArguments (Type[] param_types, Type[] arg_types, Type[] infered_types)
+ static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
+ Type[] infered_types)
{
if (infered_types == null)
return false;
return true;
}
+ /// <summary>
+ /// Type inference. Try to infer the type arguments from `method',
+ /// which is invoked with the arguments `arguments'. This is used
+ /// when resolving an Invocation or a DelegateInvocation and the user
+ /// did not explicitly specify type arguments.
+ /// </summary>
public static bool InferTypeArguments (EmitContext ec, ArrayList arguments,
ref MethodBase method)
{
else
arg_count = 0;
- ParameterData pd = Invocation.GetParameterData (method);
+ ParameterData pd = TypeManager.GetParameterData (method);
if (arg_count != pd.Count)
return false;
param_types [i] = pd.ParameterType (i);
Argument a = (Argument) arguments [i];
- if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr) ||
+ (a.Expr is AnonymousMethod))
continue;
arg_types [i] = a.Type;
if (!InferTypeArguments (param_types, arg_types, infered_types))
return false;
- method = method.BindGenericParameters (infered_types);
+ method = ((MethodInfo)method).MakeGenericMethod (infered_types);
return true;
}
+ /// <summary>
+ /// Type inference.
+ /// </summary>
public static bool InferTypeArguments (EmitContext ec, ParameterData apd,
ref MethodBase method)
{
if (!TypeManager.IsGenericMethod (method))
return true;
- ParameterData pd = Invocation.GetParameterData (method);
+ ParameterData pd = TypeManager.GetParameterData (method);
if (apd.Count != pd.Count)
return false;
if (!InferTypeArguments (param_types, arg_types, infered_types))
return false;
- method = method.BindGenericParameters (infered_types);
+ method = ((MethodInfo)method).MakeGenericMethod (infered_types);
return true;
}
public static bool IsNullableType (Type t)
{
- if (!t.IsGenericInstance)
- return false;
-
- Type gt = t.GetGenericTypeDefinition ();
- return gt == generic_nullable_type;
- }
- }
-
- public class NullCoalescingOperator : Expression
- {
- Expression left;
- Expression right;
-
- public NullCoalescingOperator (Expression left, Expression right, Location loc)
- {
- this.left = left;
- this.right = right;
- this.loc = loc;
- }
-
- public override Expression DoResolve (EmitContext ec)
- {
- Error (-1, "The ?? operator is not yet implemented.");
- return null;
- }
-
- public override void Emit (EmitContext ec)
- {
+ return generic_nullable_type == DropGenericTypeArguments (t);
}
}
Type = type;
UnderlyingType = TypeManager.GetTypeArguments (type) [0];
- PropertyInfo has_value_pi = type.GetProperty ("HasValue");
- PropertyInfo value_pi = type.GetProperty ("Value");
+ PropertyInfo has_value_pi = TypeManager.GetProperty (type, "HasValue");
+ PropertyInfo value_pi = TypeManager.GetProperty (type, "Value");
HasValue = has_value_pi.GetGetMethod (false);
Value = value_pi.GetGetMethod (false);
}
}
- protected class Unwrap : Expression, IMemoryLocation
+ protected class Unwrap : Expression, IMemoryLocation, IAssignMethod
{
Expression expr;
NullableInfo info;
ec.ig.EmitCall (OpCodes.Call, info.Value, null);
}
- public void EmitCheck (EmitContext ec, Label label)
- {
- AddressOf (ec, AddressOp.LoadStore);
- ec.ig.EmitCall (OpCodes.Call, info.HasValue, null);
- ec.ig.Emit (OpCodes.Brfalse, label);
+ public void EmitCheck (EmitContext ec)
+ {
+ AddressOf (ec, AddressOp.LoadStore);
+ ec.ig.EmitCall (OpCodes.Call, info.HasValue, null);
+ }
+
+ void create_temp (EmitContext ec)
+ {
+ if ((temp != null) && !has_temp) {
+ expr.Emit (ec);
+ temp.Store (ec);
+ has_temp = true;
+ }
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ create_temp (ec);
+ if (temp != null)
+ temp.AddressOf (ec, AddressOp.LoadStore);
+ else
+ ((IMemoryLocation) expr).AddressOf (ec, AddressOp.LoadStore);
+ }
+
+ public void Emit (EmitContext ec, bool leave_copy)
+ {
+ create_temp (ec);
+ if (leave_copy) {
+ if (temp != null)
+ temp.Emit (ec);
+ else
+ expr.Emit (ec);
+ }
+
+ Emit (ec);
}
- public void AddressOf (EmitContext ec, AddressOp mode)
+ public void EmitAssign (EmitContext ec, Expression source,
+ bool leave_copy, bool prepare_for_load)
{
- if (temp != null) {
- if (!has_temp) {
- temp.Store (ec);
- has_temp = true;
- }
- temp.AddressOf (ec, AddressOp.LoadStore);
- } else
- ((IMemoryLocation) expr).AddressOf (ec, AddressOp.LoadStore);
+ source.Emit (ec);
+ ec.ig.Emit (OpCodes.Newobj, info.Constructor);
+
+ if (leave_copy)
+ ec.ig.Emit (OpCodes.Dup);
+
+ Expression empty = new EmptyExpression (expr.Type);
+ ((IAssignMethod) expr).EmitAssign (ec, empty, false, prepare_for_load);
}
}
}
}
- public class NullLiteral : Expression, IMemoryLocation {
- public NullLiteral (Type target_type, Location loc)
+ public class NullableLiteral : Expression, IMemoryLocation {
+ public NullableLiteral (Type target_type, Location loc)
{
this.type = target_type;
this.loc = loc;
if (wrap == null)
return null;
- null_value = new NullLiteral (wrap.Type, loc).Resolve (ec);
+ null_value = new NullableLiteral (wrap.Type, loc).Resolve (ec);
if (null_value == null)
return null;
Label is_null_label = ig.DefineLabel ();
Label end_label = ig.DefineLabel ();
- unwrap.EmitCheck (ec, is_null_label);
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
wrap.Emit (ec);
ig.Emit (OpCodes.Br, end_label);
public class LiftedConditional : Lifted
{
- Expression expr, true_expr, false_expr;
- Unwrap unwrap;
+ Expression true_expr, false_expr;
public LiftedConditional (Expression expr, Expression true_expr, Expression false_expr,
Location loc)
protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
{
- return new Conditional (unwrap, true_expr, false_expr, loc);
+ return new Conditional (unwrap, true_expr, false_expr);
}
}
{
public readonly Binary.Operator Oper;
- Expression left, right, underlying, null_value;
+ Expression left, right, underlying, null_value, bool_wrap;
Unwrap left_unwrap, right_unwrap;
+ bool is_equality, is_comparision, is_boolean;
public LiftedBinaryOperator (Binary.Operator op, Expression left, Expression right,
Location loc)
public override Expression DoResolve (EmitContext ec)
{
- left = left.Resolve (ec);
- if (left == null)
- return null;
-
- right = right.Resolve (ec);
- if (right == null)
- return null;
-
if (TypeManager.IsNullableType (left.Type)) {
left_unwrap = new Unwrap (left, loc);
left = left_unwrap.Resolve (ec);
return null;
}
- underlying = new Wrap (new Binary (Oper, left, right, loc), loc);
- underlying = underlying.Resolve (ec);
- if (underlying == null)
- return null;
+ if (((Oper == Binary.Operator.BitwiseAnd) || (Oper == Binary.Operator.BitwiseOr) ||
+ (Oper == Binary.Operator.LogicalAnd) || (Oper == Binary.Operator.LogicalOr)) &&
+ ((left.Type == TypeManager.bool_type) && (right.Type == TypeManager.bool_type))) {
+ Expression empty = new EmptyExpression (TypeManager.bool_type);
+ bool_wrap = new Wrap (empty, loc).Resolve (ec);
+ null_value = new NullableLiteral (bool_wrap.Type, loc).Resolve (ec);
+
+ type = bool_wrap.Type;
+ is_boolean = true;
+ } else if ((Oper == Binary.Operator.Equality) || (Oper == Binary.Operator.Inequality)) {
+ if (!(left is NullLiteral) && !(right is NullLiteral)) {
+ underlying = new Binary (Oper, left, right).Resolve (ec);
+ if (underlying == null)
+ return null;
+ }
- null_value = new NullLiteral (underlying.Type, loc).Resolve (ec);
- if (null_value == null)
- return null;
+ type = TypeManager.bool_type;
+ is_equality = true;
+ } else if ((Oper == Binary.Operator.LessThan) ||
+ (Oper == Binary.Operator.GreaterThan) ||
+ (Oper == Binary.Operator.LessThanOrEqual) ||
+ (Oper == Binary.Operator.GreaterThanOrEqual)) {
+ underlying = new Binary (Oper, left, right).Resolve (ec);
+ if (underlying == null)
+ return null;
+
+ type = TypeManager.bool_type;
+ is_comparision = true;
+ } else {
+ underlying = new Binary (Oper, left, right).Resolve (ec);
+ if (underlying == null)
+ return null;
+
+ underlying = new Wrap (underlying, loc).Resolve (ec);
+ if (underlying == null)
+ return null;
+
+ type = underlying.Type;
+ null_value = new NullableLiteral (type, loc).Resolve (ec);
+ }
- type = underlying.Type;
eclass = ExprClass.Value;
return this;
}
+ void EmitBoolean (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label left_is_null_label = ig.DefineLabel ();
+ Label right_is_null_label = ig.DefineLabel ();
+ Label is_null_label = ig.DefineLabel ();
+ Label wrap_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ if (left_unwrap != null) {
+ left_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, left_is_null_label);
+ }
+
+ left.Emit (ec);
+ ig.Emit (OpCodes.Dup);
+ if ((Oper == Binary.Operator.BitwiseOr) || (Oper == Binary.Operator.LogicalOr))
+ ig.Emit (OpCodes.Brtrue, wrap_label);
+ else
+ ig.Emit (OpCodes.Brfalse, wrap_label);
+
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, right_is_null_label);
+ }
+
+ if ((Oper == Binary.Operator.LogicalAnd) || (Oper == Binary.Operator.LogicalOr))
+ ig.Emit (OpCodes.Pop);
+
+ right.Emit (ec);
+ if (Oper == Binary.Operator.BitwiseOr)
+ ig.Emit (OpCodes.Or);
+ else if (Oper == Binary.Operator.BitwiseAnd)
+ ig.Emit (OpCodes.And);
+ ig.Emit (OpCodes.Br, wrap_label);
+
+ ig.MarkLabel (left_is_null_label);
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+ }
+
+ right.Emit (ec);
+ ig.Emit (OpCodes.Dup);
+ if ((Oper == Binary.Operator.BitwiseOr) || (Oper == Binary.Operator.LogicalOr))
+ ig.Emit (OpCodes.Brtrue, wrap_label);
+ else
+ ig.Emit (OpCodes.Brfalse, wrap_label);
+
+ ig.MarkLabel (right_is_null_label);
+ ig.Emit (OpCodes.Pop);
+ ig.MarkLabel (is_null_label);
+ null_value.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (wrap_label);
+ ig.Emit (OpCodes.Nop);
+ bool_wrap.Emit (ec);
+ ig.Emit (OpCodes.Nop);
+
+ ig.MarkLabel (end_label);
+ }
+
+ void EmitEquality (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label left_not_null_label = ig.DefineLabel ();
+ Label false_label = ig.DefineLabel ();
+ Label true_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ bool false_label_used = false;
+ bool true_label_used = false;
+
+ if (left_unwrap != null) {
+ left_unwrap.EmitCheck (ec);
+ if (right is NullLiteral) {
+ if (Oper == Binary.Operator.Equality) {
+ true_label_used = true;
+ ig.Emit (OpCodes.Brfalse, true_label);
+ } else {
+ false_label_used = true;
+ ig.Emit (OpCodes.Brfalse, false_label);
+ }
+ } else if (right_unwrap != null) {
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Brtrue, left_not_null_label);
+ right_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Ceq);
+ if (Oper == Binary.Operator.Inequality) {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Ceq);
+ }
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (left_not_null_label);
+ ig.Emit (OpCodes.Pop);
+ } else {
+ if (Oper == Binary.Operator.Equality) {
+ false_label_used = true;
+ ig.Emit (OpCodes.Brfalse, false_label);
+ } else {
+ true_label_used = true;
+ ig.Emit (OpCodes.Brfalse, true_label);
+ }
+ }
+ }
+
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ if (left is NullLiteral) {
+ if (Oper == Binary.Operator.Equality) {
+ true_label_used = true;
+ ig.Emit (OpCodes.Brfalse, true_label);
+ } else {
+ false_label_used = true;
+ ig.Emit (OpCodes.Brfalse, false_label);
+ }
+ } else {
+ if (Oper == Binary.Operator.Equality) {
+ false_label_used = true;
+ ig.Emit (OpCodes.Brfalse, false_label);
+ } else {
+ true_label_used = true;
+ ig.Emit (OpCodes.Brfalse, true_label);
+ }
+ }
+ }
+
+ bool left_is_null = left is NullLiteral;
+ bool right_is_null = right is NullLiteral;
+ if (left_is_null || right_is_null) {
+ if (((Oper == Binary.Operator.Equality) && (left_is_null == right_is_null)) ||
+ ((Oper == Binary.Operator.Inequality) && (left_is_null != right_is_null))) {
+ true_label_used = true;
+ ig.Emit (OpCodes.Br, true_label);
+ } else {
+ false_label_used = true;
+ ig.Emit (OpCodes.Br, false_label);
+ }
+ } else {
+ underlying.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+ }
+
+ ig.MarkLabel (false_label);
+ if (false_label_used) {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ if (true_label_used)
+ ig.Emit (OpCodes.Br, end_label);
+ }
+
+ ig.MarkLabel (true_label);
+ if (true_label_used)
+ ig.Emit (OpCodes.Ldc_I4_1);
+
+ ig.MarkLabel (end_label);
+ }
+
+ void EmitComparision (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label is_null_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ if (left_unwrap != null) {
+ left_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+ }
+
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+ }
+
+ underlying.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (is_null_label);
+ ig.Emit (OpCodes.Ldc_I4_0);
+
+ ig.MarkLabel (end_label);
+ }
+
public override void Emit (EmitContext ec)
{
+ if (is_boolean) {
+ EmitBoolean (ec);
+ return;
+ } else if (is_equality) {
+ EmitEquality (ec);
+ return;
+ } else if (is_comparision) {
+ EmitComparision (ec);
+ return;
+ }
+
ILGenerator ig = ec.ig;
Label is_null_label = ig.DefineLabel ();
Label end_label = ig.DefineLabel ();
- if (left_unwrap != null)
- left_unwrap.EmitCheck (ec, is_null_label);
+ if (left_unwrap != null) {
+ left_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+ }
- if (right_unwrap != null)
- right_unwrap.EmitCheck (ec, is_null_label);
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+ }
underlying.Emit (ec);
ig.Emit (OpCodes.Br, end_label);
ig.MarkLabel (end_label);
}
}
+
+ public class OperatorTrueOrFalse : Expression
+ {
+ public readonly bool IsTrue;
+
+ Expression expr;
+ Unwrap unwrap;
+
+ public OperatorTrueOrFalse (Expression expr, bool is_true, Location loc)
+ {
+ this.IsTrue = is_true;
+ this.expr = expr;
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ unwrap = new Unwrap (expr, loc);
+ expr = unwrap.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ if (unwrap.Type != TypeManager.bool_type)
+ return null;
+
+ type = TypeManager.bool_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label is_null_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+
+ unwrap.Emit (ec);
+ if (!IsTrue) {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Ceq);
+ }
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (is_null_label);
+ ig.Emit (OpCodes.Ldc_I4_0);
+
+ ig.MarkLabel (end_label);
+ }
+ }
+
+ public class NullCoalescingOperator : Expression
+ {
+ Expression left, right;
+ Expression expr;
+ Unwrap unwrap;
+
+ public NullCoalescingOperator (Expression left, Expression right, Location loc)
+ {
+ this.left = left;
+ this.right = right;
+ this.loc = loc;
+
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (type != null)
+ return this;
+
+ left = left.Resolve (ec);
+ if (left == null)
+ return null;
+
+ right = right.Resolve (ec);
+ if (right == null)
+ return null;
+
+ Type ltype = left.Type, rtype = right.Type;
+
+ if (!TypeManager.IsNullableType (ltype) && ltype.IsValueType) {
+ Binary.Error_OperatorCannotBeApplied (loc, "??", ltype, rtype);
+ return null;
+ }
+
+ if (TypeManager.IsNullableType (ltype)) {
+ NullableInfo info = new NullableInfo (ltype);
+
+ unwrap = (Unwrap) new Unwrap (left, loc).Resolve (ec);
+ if (unwrap == null)
+ return null;
+
+ expr = Convert.ImplicitConversion (ec, right, info.UnderlyingType, loc);
+ if (expr != null) {
+ left = unwrap;
+ type = expr.Type;
+ return this;
+ }
+ }
+
+ expr = Convert.ImplicitConversion (ec, right, ltype, loc);
+ if (expr != null) {
+ type = expr.Type;
+ return this;
+ }
+
+ if (unwrap != null) {
+ expr = Convert.ImplicitConversion (ec, unwrap, rtype, loc);
+ if (expr != null) {
+ left = expr;
+ expr = right;
+ type = expr.Type;
+ return this;
+ }
+ }
+
+ Binary.Error_OperatorCannotBeApplied (loc, "??", ltype, rtype);
+ return null;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label is_null_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ if (unwrap != null) {
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+
+ left.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (is_null_label);
+ expr.Emit (ec);
+
+ ig.MarkLabel (end_label);
+ } else {
+ left.Emit (ec);
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Brtrue, end_label);
+
+ ig.MarkLabel (is_null_label);
+
+ ig.Emit (OpCodes.Pop);
+ expr.Emit (ec);
+
+ ig.MarkLabel (end_label);
+ }
+ }
+ }
+
+ public class LiftedUnaryMutator : ExpressionStatement
+ {
+ public readonly UnaryMutator.Mode Mode;
+ Expression expr, null_value;
+ UnaryMutator underlying;
+ Unwrap unwrap;
+
+ public LiftedUnaryMutator (UnaryMutator.Mode mode, Expression expr, Location loc)
+ {
+ this.expr = expr;
+ this.Mode = mode;
+ this.loc = loc;
+
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ unwrap = (Unwrap) new Unwrap (expr, loc).Resolve (ec);
+ if (unwrap == null)
+ return null;
+
+ underlying = (UnaryMutator) new UnaryMutator (Mode, unwrap, loc).Resolve (ec);
+ if (underlying == null)
+ return null;
+
+ null_value = new NullableLiteral (expr.Type, loc).Resolve (ec);
+ if (null_value == null)
+ return null;
+
+ type = expr.Type;
+ return this;
+ }
+
+ void DoEmit (EmitContext ec, bool is_expr)
+ {
+ ILGenerator ig = ec.ig;
+ Label is_null_label = ig.DefineLabel ();
+ Label end_label = ig.DefineLabel ();
+
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, is_null_label);
+
+ if (is_expr)
+ underlying.Emit (ec);
+ else
+ underlying.EmitStatement (ec);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (is_null_label);
+ if (is_expr)
+ null_value.Emit (ec);
+
+ ig.MarkLabel (end_label);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ DoEmit (ec, true);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ DoEmit (ec, false);
+ }
+ }
}
}
projects / mono.git / blobdiff