//
-// generic.cs: Support classes for generics
+// generic.cs: Generics support
//
-// Author:
-// Miguel de Icaza (miguel@ximian.com)
+// Authors: Martin Baulig (martin@ximian.com)
+// Miguel de Icaza (miguel@ximian.com)
//
-// (C) 2003 Ximian, Inc.
+// Licensed under the terms of the GNU GPL
+//
+// (C) 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
+// (C) 2004 Novell, Inc
//
using System;
using System.Reflection;
using System.Globalization;
using System.Collections;
using System.Text;
+using System.Text.RegularExpressions;
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 HasConstructorConstraint {
+ get { return (Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0; }
+ }
+
+ public bool HasReferenceTypeConstraint {
+ get { return (Attributes & GenericParameterAttributes.ReferenceTypeConstraint) != 0; }
+ }
+
+ public bool HasValueTypeConstraint {
+ get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
+ }
+
+ public virtual bool HasClassConstraint {
+ get { return ClassConstraint != null; }
+ }
+
+ public abstract Type ClassConstraint {
+ get;
+ }
+
+ public abstract Type[] InterfaceConstraints {
+ get;
+ }
+
+ public abstract Type EffectiveBaseClass {
+ get;
+ }
+
+ // <summary>
+ // Returns whether the type parameter is "known to be a reference type".
+ // </summary>
+ public virtual bool IsReferenceType {
+ get {
+ if (HasReferenceTypeConstraint)
+ return true;
+ if (HasValueTypeConstraint)
+ return false;
+
+ if (ClassConstraint != null) {
+ if (ClassConstraint.IsValueType)
+ return false;
+
+ if (ClassConstraint != TypeManager.object_type)
+ return true;
+ }
+
+ foreach (Type t in InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
+ if ((gc != null) && gc.IsReferenceType)
+ return true;
+ }
+
+ return false;
+ }
+ }
+
+ // <summary>
+ // Returns whether the type parameter is "known to be a value type".
+ // </summary>
+ public virtual bool IsValueType {
+ get {
+ if (HasValueTypeConstraint)
+ return true;
+ if (HasReferenceTypeConstraint)
+ return false;
+
+ if (ClassConstraint != null) {
+ if (!ClassConstraint.IsValueType)
+ return false;
+
+ if (ClassConstraint != TypeManager.value_type)
+ return true;
+ }
+
+ foreach (Type t in InterfaceConstraints) {
+ if (!t.IsGenericParameter)
+ continue;
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
+ if ((gc != null) && gc.IsValueType)
+ return true;
+ }
+
+ return false;
+ }
+ }
+ }
+
public enum SpecialConstraint
{
Constructor,
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;
}
}
- bool has_ctor_constraint;
- bool has_reference_type;
- bool has_value_type;
+ GenericParameterAttributes attrs;
TypeExpr class_constraint;
ArrayList iface_constraints;
- int num_constraints, first_constraint;
+ ArrayList type_param_constraints;
+ int num_constraints;
Type class_constraint_type;
Type[] iface_constraint_types;
-
- public bool HasConstructorConstraint {
- get { return has_ctor_constraint; }
- }
-
- public bool Resolve (DeclSpace ds)
+ 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 ();
foreach (object obj in constraints) {
- if (has_ctor_constraint) {
+ if (HasConstructorConstraint) {
Report.Error (401, loc,
"The new() constraint must be last.");
return false;
SpecialConstraint sc = (SpecialConstraint) obj;
if (sc == SpecialConstraint.Constructor) {
- if (!has_value_type) {
- has_ctor_constraint = true;
+ if (!HasValueTypeConstraint) {
+ attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
continue;
}
return false;
}
- if ((num_constraints > 0) || has_reference_type ||
- has_value_type) {
+ if ((num_constraints > 0) || HasReferenceTypeConstraint || HasValueTypeConstraint) {
Report.Error (449, loc,
"The `class' or `struct' " +
"constraint must be first");
}
if (sc == SpecialConstraint.ReferenceType)
- has_reference_type = true;
+ attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
else
- has_value_type = true;
+ attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
continue;
}
- TypeExpr expr = ds.ResolveTypeExpr ((Expression) obj, false, loc);
- if (expr == null)
- return false;
+ int errors = Report.Errors;
+ FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec, false);
+
+ if (fn == null) {
+ if (errors != Report.Errors)
+ return false;
- if (expr is TypeParameterExpr) {
- Report.Error (700, loc,
- "`{0}': naked type parameters cannot " +
- "be used as bounds", expr.Name);
+ Report.Error (246, loc, "Cannot find type '{0}'", ((Expression) obj).GetSignatureForError ());
return false;
}
- if (expr.IsInterface)
+ TypeExpr expr;
+ ConstructedType cexpr = fn as ConstructedType;
+ if (cexpr != null) {
+ if (!cexpr.ResolveConstructedType (ec))
+ return false;
+
+ expr = cexpr;
+ } else
+ expr = fn.ResolveAsTypeTerminal (ec, false);
+
+ if ((expr == null) || (expr.Type == null))
+ return false;
+
+ TypeParameterExpr texpr = expr as TypeParameterExpr;
+ if (texpr != null)
+ type_param_constraints.Add (expr);
+ else if (expr.IsInterface)
iface_constraints.Add (expr);
else if (class_constraint != null) {
Report.Error (406, loc,
"must come before any other constraints.",
expr.Name, name);
return false;
- } else if (has_reference_type || has_value_type) {
+ } else if (HasReferenceTypeConstraint || HasValueTypeConstraint) {
Report.Error (450, loc, "`{0}': cannot specify both " +
"a constraint class and the `class' " +
"or `struct' constraint.", expr.Name);
num_constraints++;
}
- return true;
- }
-
- public TypeExpr[] InterfaceConstraints {
- get {
- TypeExpr[] ifaces = new TypeExpr [iface_constraints.Count];
- iface_constraints.CopyTo (ifaces, 0);
- return ifaces;
- }
- }
-
- public bool ResolveTypes (EmitContext ec)
- {
- iface_constraint_types = new Type [iface_constraints.Count];
+ ArrayList list = new ArrayList ();
+ foreach (TypeExpr iface_constraint in iface_constraints) {
+ foreach (Type type in list) {
+ if (!type.Equals (iface_constraint.Type))
+ continue;
- for (int i = 0; i < iface_constraints.Count; i++) {
- TypeExpr iface_constraint = (TypeExpr) iface_constraints [i];
- Type resolved = iface_constraint.ResolveType (ec);
- if (resolved == null)
+ Report.Error (405, loc,
+ "Duplicate constraint `{0}' for type " +
+ "parameter `{1}'.", iface_constraint.GetSignatureForError (),
+ name);
return false;
+ }
+
+ list.Add (iface_constraint.Type);
+ }
- for (int j = 0; j < i; j++) {
- if (!iface_constraint_types [j].Equals (resolved))
+ 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}'.", resolved, name);
+ "parameter `{1}'.", expr.GetSignatureForError (), name);
return false;
}
- iface_constraint_types [i] = resolved;
+ 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.ResolveType (ec);
+ class_constraint_type = class_constraint.Type;
if (class_constraint_type == null)
return false;
Report.Error (701, loc,
"`{0}' is not a valid bound. Bounds " +
"must be interfaces or non sealed " +
- "classes", class_constraint_type);
+ "classes", TypeManager.CSharpName (class_constraint_type));
return false;
}
(class_constraint_type == TypeManager.object_type)) {
Report.Error (702, loc,
"Bound cannot be special class `{0}'",
- class_constraint_type);
+ TypeManager.CSharpName (class_constraint_type));
return false;
}
}
- if (has_reference_type)
- class_constraint_type = TypeManager.object_type;
- else if (has_value_type)
- class_constraint_type = TypeManager.value_type;
+ 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;
}
- public void Define (GenericTypeParameterBuilder type)
+ bool CheckTypeParameterConstraints (TypeParameter tparam, Hashtable seen)
+ {
+ seen.Add (tparam, true);
+
+ Constraints constraints = tparam.Constraints;
+ if (constraints == null)
+ return true;
+
+ if (constraints.HasValueTypeConstraint) {
+ Report.Error (456, loc, "Type parameter `{0}' has " +
+ "the `struct' constraint, so it cannot " +
+ "be used as a constraint for `{1}'",
+ tparam.Name, name);
+ return false;
+ }
+
+ if (constraints.type_param_constraints == null)
+ return true;
+
+ foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
+ if (seen.Contains (expr.TypeParameter)) {
+ Report.Error (454, loc, "Circular constraint " +
+ "dependency involving `{0}' and `{1}'",
+ tparam.Name, expr.Name);
+ return false;
+ }
+
+ if (!CheckTypeParameterConstraints (expr.TypeParameter, seen))
+ return false;
+ }
+
+ return true;
+ }
+
+ /// <summary>
+ /// Resolve the constraints into actual types.
+ /// </summary>
+ public bool ResolveTypes (EmitContext ec)
{
- if (has_ctor_constraint)
- type.Mono_SetConstructorConstraint ();
- if (has_reference_type)
- type.Mono_SetReferenceTypeConstraint ();
- else if (has_value_type)
- type.Mono_SetValueTypeConstraint ();
+ if (resolved_types)
+ return true;
+
+ resolved_types = true;
+
+ foreach (object obj in constraints) {
+ ConstructedType cexpr = obj as ConstructedType;
+ if (cexpr == null)
+ continue;
+
+ if (!cexpr.CheckConstraints (ec))
+ return false;
+ }
+
+ foreach (TypeParameterExpr expr in type_param_constraints) {
+ Hashtable seen = new Hashtable ();
+ if (!CheckTypeParameterConstraints (expr.TypeParameter, seen))
+ return false;
+ }
+
+ foreach (TypeExpr iface_constraint in iface_constraints) {
+ if (iface_constraint.ResolveType (ec) == null)
+ return false;
+ }
+
+ if (class_constraint != null) {
+ if (class_constraint.ResolveType (ec) == null)
+ return false;
+ }
+
+ return true;
}
- bool GenericConstraints.HasConstructor {
- get { return has_ctor_constraint; }
+ /// <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 (!CheckDependencies (expr.TypeParameter, ec))
+ return false;
+ }
+
+ return true;
}
- bool GenericConstraints.IsReferenceType {
- get { return has_reference_type; }
+ bool CheckDependencies (TypeParameter tparam, EmitContext ec)
+ {
+ Constraints constraints = tparam.Constraints;
+ if (constraints == null)
+ return true;
+
+ if (HasValueTypeConstraint && constraints.HasClassConstraint) {
+ Report.Error (455, loc, "Type parameter `{0}' inherits " +
+ "conflicting constraints `{1}' and `{2}'",
+ name, TypeManager.CSharpName (constraints.ClassConstraint),
+ "System.ValueType");
+ return false;
+ }
+
+ if (HasClassConstraint && constraints.HasClassConstraint) {
+ Type t1 = ClassConstraint;
+ TypeExpr e1 = class_constraint;
+ Type t2 = constraints.ClassConstraint;
+ TypeExpr e2 = constraints.class_constraint;
+
+ if (!Convert.ImplicitReferenceConversionExists (ec, e1, t2) &&
+ !Convert.ImplicitReferenceConversionExists (ec, e2, t1)) {
+ Report.Error (455, loc,
+ "Type parameter `{0}' inherits " +
+ "conflicting constraints `{1}' and `{2}'",
+ name, TypeManager.CSharpName (t1), TypeManager.CSharpName (t2));
+ return false;
+ }
+ }
+
+ if (constraints.type_param_constraints == null)
+ return true;
+
+ foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
+ if (!CheckDependencies (expr.TypeParameter, ec))
+ return false;
+ }
+
+ return true;
}
- bool GenericConstraints.IsValueType {
- get { return has_value_type; }
+ public override GenericParameterAttributes Attributes {
+ get { return attrs; }
}
- bool GenericConstraints.HasClassConstraint {
- get { return class_constraint_type != null; }
+ public override bool HasClassConstraint {
+ get { return class_constraint != null; }
}
- Type GenericConstraints.ClassConstraint {
+ public override Type ClassConstraint {
get { return class_constraint_type; }
}
- Type[] GenericConstraints.InterfaceConstraints {
+ public override Type[] InterfaceConstraints {
get { return iface_constraint_types; }
}
+
+ public override Type EffectiveBaseClass {
+ get { return effective_base_type; }
+ }
+
+ public bool IsSubclassOf (Type t)
+ {
+ if ((class_constraint_type != null) &&
+ class_constraint_type.IsSubclassOf (t))
+ return true;
+
+ if (iface_constraint_types == null)
+ return false;
+
+ foreach (Type iface in iface_constraint_types) {
+ if (TypeManager.IsSubclassOf (iface, t))
+ return true;
+ }
+
+ 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)
+ return false;
+
+ if (HasClassConstraint != gc.HasClassConstraint)
+ return false;
+ if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
+ return false;
+
+ int gc_icount = gc.InterfaceConstraints != null ?
+ gc.InterfaceConstraints.Length : 0;
+ int icount = InterfaceConstraints != null ?
+ InterfaceConstraints.Length : 0;
+
+ if (gc_icount != icount)
+ return false;
+
+ foreach (Type iface in gc.InterfaceConstraints) {
+ bool ok = false;
+ foreach (Type check in InterfaceConstraints) {
+ if (TypeManager.IsEqual (iface, check)) {
+ ok = true;
+ break;
+ }
+ }
+
+ if (!ok)
+ return false;
+ }
+
+ return true;
+ }
}
- //
- // This type represents a generic type parameter
- //
- public class TypeParameter : IMemberContainer {
+ /// <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 (string name, Constraints constraints, Location loc)
+ public TypeParameter (DeclSpace 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 string Name {
- get {
- return name;
- }
- }
-
- public Location Location {
+ public GenericConstraints GenericConstraints {
get {
- return loc;
+ return gc != null ? gc : constraints;
}
}
}
}
+ public DeclSpace DeclSpace {
+ get {
+ return decl;
+ }
+ }
+
public Type Type {
get {
return type;
}
}
+ /// <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)
+ throw new InvalidOperationException ();
+
+ this.type = type;
+ TypeManager.AddTypeParameter (type, this);
+ }
+
+ /// <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)
- return constraints.Resolve (ds);
+ if (constraints != null) {
+ if (!constraints.Resolve (ds.EmitContext)) {
+ constraints = null;
+ return false;
+ }
+ }
return true;
}
- public void Define (GenericTypeParameterBuilder type)
+ /// <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)
{
- this.type = type;
- TypeExpr[] ifaces = null;
if (constraints != null) {
- ifaces = constraints.InterfaceConstraints;
- constraints.Define (type);
+ if (!constraints.ResolveTypes (ec)) {
+ constraints = null;
+ return false;
+ }
}
- TypeManager.AddTypeParameter (type, this, ifaces);
+
+ 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)
{
- if (constraints != null) {
- if (!constraints.ResolveTypes (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)
+ {
+ if (!ResolveType (ec))
+ return false;
+
+ if (implementing != null) {
+ if (is_override && (constraints != null)) {
+ Report.Error (
+ 460, loc, "Constraints for override and " +
+ "explicit interface implementation methods " +
+ "are inherited from the base method so they " +
+ "cannot be specified directly");
return false;
+ }
- GenericConstraints gc = (GenericConstraints) constraints;
+ MethodBase mb = TypeManager.DropGenericMethodArguments (implementing);
+
+ int pos = type.GenericParameterPosition;
+ Type mparam = mb.GetGenericArguments () [pos];
+ GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
+
+ if (temp_gc != null)
+ gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
+ else if (constraints != null)
+ gc = new InflatedConstraints (constraints, implementing.DeclaringType);
+
+ bool ok = true;
+ if (constraints != null) {
+ if (temp_gc == null)
+ ok = false;
+ else if (!constraints.CheckInterfaceMethod (ec, gc))
+ ok = false;
+ } else {
+ if (!is_override && (temp_gc != null))
+ ok = false;
+ }
- if (gc.HasClassConstraint)
- type.SetBaseTypeConstraint (gc.ClassConstraint);
+ if (!ok) {
+ Report.SymbolRelatedToPreviousError (implementing);
+
+ Report.Error (
+ 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 " +
+ "an explicit interface implementation instead",
+ Name, TypeManager.CSharpSignature (builder),
+ 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;
- type.SetInterfaceConstraints (gc.InterfaceConstraints);
+ if (constraints != null)
+ gc = new InflatedConstraints (constraints, types);
+ } else {
+ gc = (GenericConstraints) constraints;
}
- return true;
- }
+ if (gc == null)
+ return true;
- //
- // IMemberContainer
- //
+ if (gc.HasClassConstraint)
+ type.SetBaseTypeConstraint (gc.ClassConstraint);
- IMemberContainer IMemberContainer.Parent {
- get { return null; }
- }
+ type.SetInterfaceConstraints (gc.InterfaceConstraints);
+ type.SetGenericParameterAttributes (gc.Attributes);
+ TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
- bool IMemberContainer.IsInterface {
- get { return true; }
+ return true;
}
- MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
+ /// <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)
{
- return FindMembers (mt, bf, null, null);
- }
+ if (constraints != null)
+ return constraints.CheckDependencies (ec);
- MemberCache IMemberContainer.MemberCache {
- get { return null; }
+ return true;
}
- public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
- MemberFilter filter, object criteria)
+ /// <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)
{
- if (constraints == null)
- return MemberList.Empty;
-
- ArrayList members = new ArrayList ();
+ if (type == null)
+ throw new InvalidOperationException ();
- GenericConstraints gc = (GenericConstraints) constraints;
+ if (constraints == null) {
+ new_constraints = constraints;
+ return true;
+ } else if (new_constraints == null)
+ return true;
- if (gc.HasClassConstraint) {
- MemberList list = TypeManager.FindMembers (
- gc.ClassConstraint, mt, bf, filter, criteria);
+ if (!new_constraints.Resolve (ec))
+ return false;
+ if (!new_constraints.ResolveTypes (ec))
+ return false;
- members.AddRange (list);
- }
+ return constraints.CheckInterfaceMethod (ec, new_constraints);
+ }
- foreach (Type t in gc.InterfaceConstraints) {
- MemberList list = TypeManager.FindMembers (
- t, mt, bf, filter, criteria);
+ public void EmitAttributes (EmitContext ec)
+ {
+ if (OptAttributes != null)
+ OptAttributes.Emit (ec, this);
+ }
- members.AddRange (list);
+ public override string DocCommentHeader {
+ get {
+ throw new InvalidOperationException (
+ "Unexpected attempt to get doc comment from " + this.GetType () + ".");
}
-
- return new MemberList (members);
+ }
+
+ //
+ // MemberContainer
+ //
+
+ public override bool Define ()
+ {
+ return true;
+ }
+
+ public override void ApplyAttributeBuilder (Attribute a,
+ CustomAttributeBuilder cb)
+ {
+ type.SetCustomAttribute (cb);
+ }
+
+ public override AttributeTargets AttributeTargets {
+ get {
+ return (AttributeTargets) AttributeTargets.GenericParameter;
+ }
+ }
+
+ public override string[] ValidAttributeTargets {
+ get {
+ return new string [] { "type parameter" };
+ }
+ }
+
+ //
+ // IMemberContainer
+ //
+
+ string IMemberContainer.Name {
+ get { return Name; }
+ }
+
+ MemberCache IMemberContainer.BaseCache {
+ get { return null; }
+ }
+
+ bool IMemberContainer.IsInterface {
+ get { return true; }
+ }
+
+ MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
+ {
+ return FindMembers (mt, bf, null, null);
+ }
+
+ MemberCache IMemberContainer.MemberCache {
+ get { return null; }
+ }
+
+ public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
+ MemberFilter filter, object criteria)
+ {
+ if (constraints == null)
+ return MemberList.Empty;
+
+ ArrayList members = new ArrayList ();
+
+ if (gc.HasClassConstraint) {
+ MemberList list = TypeManager.FindMembers (
+ gc.ClassConstraint, mt, bf, filter, criteria);
+
+ members.AddRange (list);
+ }
+
+ Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
+ foreach (Type t in ifaces) {
+ MemberList list = TypeManager.FindMembers (
+ t, mt, bf, filter, criteria);
+
+ members.AddRange (list);
+ }
+
+ return new MemberList (members);
+ }
+
+ public bool IsSubclassOf (Type t)
+ {
+ if (type.Equals (t))
+ return true;
+
+ if (constraints != null)
+ return constraints.IsSubclassOf (t);
+
+ return false;
}
public override string ToString ()
{
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 ();
+ }
+
+ public void InflateConstraints (Type declaring)
+ {
+ if (constraints != null)
+ gc = new InflatedConstraints (constraints, declaring);
+ }
+
+ protected class InflatedConstraints : GenericConstraints
+ {
+ GenericConstraints gc;
+ Type base_type;
+ Type class_constraint;
+ Type[] iface_constraints;
+ Type[] dargs;
+
+ public InflatedConstraints (GenericConstraints gc, Type declaring)
+ : this (gc, TypeManager.GetTypeArguments (declaring))
+ { }
+
+ public InflatedConstraints (GenericConstraints gc, Type[] dargs)
+ {
+ this.gc = gc;
+ this.dargs = dargs;
+
+ ArrayList list = new ArrayList ();
+ if (gc.HasClassConstraint)
+ list.Add (inflate (gc.ClassConstraint));
+ foreach (Type iface in gc.InterfaceConstraints)
+ list.Add (inflate (iface));
+
+ bool has_class_constr = false;
+ if (list.Count > 0) {
+ Type first = (Type) list [0];
+ has_class_constr = !first.IsInterface && !first.IsGenericParameter;
+ }
+
+ if ((list.Count > 0) && has_class_constr) {
+ class_constraint = (Type) list [0];
+ iface_constraints = new Type [list.Count - 1];
+ list.CopyTo (1, iface_constraints, 0, list.Count - 1);
+ } else {
+ iface_constraints = new Type [list.Count];
+ list.CopyTo (iface_constraints, 0);
+ }
+
+ if (HasValueTypeConstraint)
+ base_type = TypeManager.value_type;
+ else if (class_constraint != null)
+ base_type = class_constraint;
+ else
+ base_type = TypeManager.object_type;
+ }
+
+ Type inflate (Type t)
+ {
+ if (t == null)
+ return null;
+ if (t.IsGenericParameter)
+ return dargs [t.GenericParameterPosition];
+ if (t.IsGenericType) {
+ t = t.GetGenericTypeDefinition ();
+ t = t.MakeGenericType (dargs);
+ }
+
+ return t;
+ }
+
+ public override string TypeParameter {
+ get { return gc.TypeParameter; }
+ }
+
+ public override GenericParameterAttributes Attributes {
+ get { return gc.Attributes; }
+ }
+
+ public override Type ClassConstraint {
+ get { return class_constraint; }
+ }
+
+ public override Type EffectiveBaseClass {
+ get { return base_type; }
+ }
+
+ public override Type[] InterfaceConstraints {
+ get { return iface_constraints; }
+ }
+ }
}
- //
- // 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;
}
}
+ public override string FullName {
+ get {
+ return type_parameter.Name;
+ }
+ }
+
public TypeParameter TypeParameter {
get {
return type_parameter;
this.loc = loc;
}
- public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
type = type_parameter.Type;
return this;
}
+ public override bool IsInterface {
+ get { return false; }
+ }
+
+ public override bool CheckAccessLevel (DeclSpace ds)
+ {
+ return true;
+ }
+
public void Error_CannotUseAsUnmanagedType (Location loc)
{
Report.Error (-203, loc, "Can not use type parameter as unamanged type");
}
}
+ /// <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;
Type[] atypes;
+ int dimension;
bool has_type_args;
bool created;
this.Location = loc;
}
+ public TypeArguments (int dimension, Location loc)
+ {
+ this.dimension = dimension;
+ this.Location = loc;
+ }
+
public void Add (Expression type)
{
if (created)
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;
public int Count {
get {
- return args.Count;
+ if (dimension > 0)
+ return dimension;
+ else
+ return args.Count;
+ }
+ }
+
+ public bool IsUnbound {
+ get {
+ return dimension > 0;
}
}
{
StringBuilder s = new StringBuilder ();
- int count = args.Count;
+ int count = Count;
for (int i = 0; i < count; i++){
//
// FIXME: Use TypeManager.CSharpname once we have the type
//
- s.Append (args [i].ToString ());
+ if (args != null)
+ s.Append (args [i].ToString ());
if (i+1 < count)
s.Append (",");
}
return s.ToString ();
}
+ /// <summary>
+ /// Resolve the type arguments.
+ /// </summary>
public bool Resolve (EmitContext ec)
{
- DeclSpace ds = ec.DeclSpace;
int count = args.Count;
bool ok = true;
atypes = new Type [count];
-
+
for (int i = 0; i < count; i++){
- TypeExpr te = ds.ResolveTypeExpr (
- (Expression) args [i], false, Location);
+ TypeExpr te = ((Expression) args [i]).ResolveAsTypeTerminal (ec, false);
if (te == null) {
ok = false;
continue;
}
if (te is TypeParameterExpr)
has_type_args = true;
- atypes [i] = te.ResolveType (ec);
- if (atypes [i] == null) {
- Report.Error (246, Location, "Cannot find type `{0}'",
- te.Name);
- ok = false;
+ if (te.Type.IsPointer) {
+ 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 TypeParameterName : SimpleName
+ {
+ Attributes attributes;
+
+ public TypeParameterName (string name, Attributes attrs, Location loc)
+ : base (name, loc)
+ {
+ attributes = attrs;
+ }
+
+ public Attributes OptAttributes {
+ get {
+ return attributes;
+ }
+ }
+ }
+
+ /// <summary>
+ /// An instantiation of a generic type.
+ /// </summary>
public class ConstructedType : TypeExpr {
- string name, full_name;
+ string full_name;
+ FullNamedExpression name;
TypeArguments args;
Type[] gen_params, atypes;
Type gt;
-
- public ConstructedType (string name, TypeArguments args, Location l)
+
+ /// <summary>
+ /// Instantiate the generic type `fname' with the type arguments `args'.
+ /// </summary>
+ public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
{
loc = l;
- this.name = name + "!" + args.Count;
+ this.name = fname;
this.args = args;
eclass = ExprClass.Type;
full_name = name + "<" + args.ToString () + ">";
}
- public ConstructedType (string name, TypeParameter[] type_params, Location l)
- : this (type_params, l)
- {
- loc = l;
-
- this.name = name;
- full_name = name + "<" + args.ToString () + ">";
- }
-
protected ConstructedType (TypeArguments args, Location l)
{
loc = l;
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 CheckConstraints (EmitContext ec, int index)
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
- Type atype = atypes [index];
- Type ptype = gen_params [index];
-
- if (atype == ptype)
- return true;
-
- Expression aexpr = new EmptyExpression (atype);
-
- Type parent = ptype.BaseType;
-
- //
- // First, check the `class' and `struct' constraints.
- //
- if (parent == TypeManager.object_type) {
- if (!atype.IsClass) {
- Report.Error (452, loc, "The type `{0}' must be " +
- "a reference type in order to use it " +
- "as type parameter `{1}' in the " +
- "generic type or method `{2}'.",
- atype, ptype, DeclarationName);
- return false;
- }
- } else if (parent == TypeManager.value_type) {
- if (!atype.IsValueType) {
- 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);
- return false;
- }
- }
-
- //
- // The class constraint comes next.
- //
- if ((parent != null) && (parent != TypeManager.object_type)) {
- if (!Convert.ImplicitStandardConversionExists (aexpr, parent)) {
- 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, parent, ptype, DeclarationName);
- return false;
- }
- }
-
- //
- // Now, check the interface constraints.
- //
- foreach (TypeExpr iface in TypeManager.GetInterfaces (ptype)) {
- Type itype = iface.ResolveType (ec);
- if (itype == null)
- return false;
-
- if (!Convert.ImplicitStandardConversionExists (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);
- return false;
- }
- }
-
- //
- // Finally, check the constructor constraint.
- //
-
- if (!TypeManager.HasConstructorConstraint (ptype))
- return true;
-
- MethodGroupExpr mg = Expression.MemberLookup (
- ec, atype, ".ctor", MemberTypes.Constructor,
- BindingFlags.Public | BindingFlags.Instance |
- BindingFlags.DeclaredOnly, loc)
- as MethodGroupExpr;
+ if (!ResolveConstructedType (ec))
+ return null;
- 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;
- }
+ return this;
+ }
- return true;
+ /// <summary>
+ /// Check the constraints; we're called from ResolveAsTypeTerminal()
+ /// after fully resolving the constructed type.
+ /// </summary>
+ public bool CheckConstraints (EmitContext ec)
+ {
+ return ConstraintChecker.CheckConstraints (ec, gt, gen_params, atypes, loc);
}
- public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ /// <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 this;
-
- //
- // First, resolve the generic type.
- //
- DeclSpace ds;
- Type nested = ec.DeclSpace.FindNestedType (loc, name, out ds);
- if (nested != null) {
- gt = nested.GetGenericTypeDefinition ();
-
- TypeArguments new_args = new TypeArguments (loc);
- foreach (TypeParameter param in ds.TypeParameters)
- new_args.Add (new TypeParameterExpr (param, loc));
- new_args.Add (args);
-
- args = new_args;
- return this;
- }
+ return DoResolveType (ec);
- Type t;
int num_args;
+ Type t = name.Type;
- SimpleName sn = new SimpleName (name, loc);
- TypeExpr resolved = sn.ResolveAsTypeTerminal (ec);
- if ((resolved == null) || (resolved.Type == null)) {
- Report.Error (246, loc,
- "The type or namespace name `{0}<...>' "+
- "could not be found", Basename);
- return null;
- }
-
- t = resolved.Type;
if (t == null) {
- Report.Error (246, loc, "Cannot find type `{0}'<...>",
- Basename);
- return null;
+ Report.Error (246, loc, "Cannot find type `{0}'<...>", Name);
+ return false;
}
num_args = TypeManager.GetNumberOfTypeArguments (t);
"The non-generic type `{0}' cannot " +
"be used with type arguments.",
TypeManager.CSharpName (t));
- return null;
+ return false;
}
gt = t.GetGenericTypeDefinition ();
- return this;
+ return DoResolveType (ec);
}
- public override Type ResolveType (EmitContext ec)
+ bool DoResolveType (EmitContext ec)
{
- if (type != null)
- return type;
- if (DoResolveAsTypeStep (ec) == null)
- return null;
-
//
// Resolve the arguments.
//
if (args.Resolve (ec) == false)
- return null;
+ return false;
gen_params = gt.GetGenericArguments ();
atypes = args.Arguments;
Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
- TypeManager.GetFullName (gt),
- gen_params.Length);
- return null;
- }
-
- for (int i = 0; i < gen_params.Length; i++) {
- if (!CheckConstraints (ec, i))
- return null;
+ TypeManager.CSharpName (gt),
+ gen_params.Length.ToString ());
+ return false;
}
//
// Now bind the parameters.
//
- type = gt.BindGenericParameters (atypes);
- return type;
+ type = gt.MakeGenericType (atypes);
+ return true;
}
public Expression GetSimpleName (EmitContext ec)
{
- return new SimpleName (Basename, args, loc);
+ return this;
}
public override bool CheckAccessLevel (DeclSpace ds)
get { return gt.IsSealed; }
}
- public override bool IsAttribute {
- get { return false; }
- }
-
- public override TypeExpr[] GetInterfaces ()
- {
- TypeExpr[] ifaces = TypeManager.GetInterfaces (gt);
- return ifaces;
- }
-
public override bool Equals (object obj)
{
ConstructedType cobj = obj as ConstructedType;
return type == cobj.type;
}
- public string Basename {
- get {
- int pos = name.LastIndexOf ('!');
- if (pos >= 0)
- return name.Substring (0, pos);
- else
- return name;
- }
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
}
public override string Name {
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);
+
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (ptype);
+ if (gc == null)
+ return true;
+
+ bool is_class, is_struct;
+ if (atype.IsGenericParameter) {
+ GenericConstraints agc = TypeManager.GetTypeParameterConstraints (atype);
+ if (agc != null) {
+ is_class = agc.HasReferenceTypeConstraint;
+ is_struct = agc.HasValueTypeConstraint;
+ } else {
+ is_class = is_struct = false;
+ }
+ } else {
+ is_class = atype.IsClass || atype.IsInterface;
+ is_struct = atype.IsValueType && !TypeManager.IsNullableType (atype);
+ }
+
+ //
+ // First, check the `class' and `struct' constraints.
+ //
+ if (gc.HasReferenceTypeConstraint && !is_class) {
+ Report.Error (452, loc, "The type `{0}' must be " +
+ "a reference type in order to use it " +
+ "as type parameter `{1}' in the " +
+ "generic type or method `{2}'.",
+ 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 " +
+ "non-nullable value type in order to use it " +
+ "as type parameter `{1}' in the " +
+ "generic type or method `{2}'.",
+ TypeManager.CSharpName (atype),
+ TypeManager.CSharpName (ptype),
+ GetSignatureForError ());
+ return false;
+ }
+
+ //
+ // The class constraint comes next.
+ //
+ if (gc.HasClassConstraint) {
+ if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint))
+ return false;
+ }
+
+ //
+ // Now, check the interface constraints.
+ //
+ foreach (Type it in gc.InterfaceConstraints) {
+ if (!CheckConstraint (ec, ptype, aexpr, it))
+ return false;
+ }
+
+ //
+ // Finally, check the constructor constraint.
+ //
+
+ if (!gc.HasConstructorConstraint)
+ return true;
+
+ if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
+ return true;
+
+ if (HasDefaultConstructor (ec, atype))
+ 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 bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
+ Type ctype)
+ {
+ 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 = atypes [pos];
+ }
+ new_args.Add (new TypeExpression (t, loc));
+ }
+
+ TypeExpr ct = new ConstructedType (ctype, new_args, loc);
+ if (ct.ResolveAsTypeStep (ec, false) == null)
+ return false;
+ ctype = ct.Type;
+ } else if (ctype.IsGenericParameter) {
+ int pos = ctype.GenericParameterPosition;
+ ctype = atypes [pos];
+ }
+
+ if (Convert.ImplicitStandardConversionExists (ec, expr, ctype))
+ return true;
+
+ Error_TypeMustBeConvertible (expr.Type, ctype, ptype);
+ return false;
+ }
+
+ bool HasDefaultConstructor (EmitContext ec, Type atype)
+ {
+ atype = TypeManager.DropGenericTypeArguments (atype);
+
+ if (atype is TypeBuilder) {
+ if (atype.IsAbstract)
+ return false;
+
+ 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;
+
+ return true;
+ }
+ }
+
+ MethodGroupExpr mg = Expression.MemberLookup (
+ ec.ContainerType, atype, ".ctor", MemberTypes.Constructor,
+ BindingFlags.Public | BindingFlags.Instance |
+ BindingFlags.DeclaredOnly, loc)
+ as MethodGroupExpr;
+
+ if (!atype.IsAbstract && (mg != null) && mg.IsInstance) {
+ foreach (MethodBase mb in mg.Methods) {
+ ParameterData pd = TypeManager.GetParameterData (mb);
+ if (pd.Count == 0)
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ protected abstract string GetSignatureForError ();
+ protected abstract void Report_SymbolRelatedToPreviousError ();
+
+ void Error_TypeMustBeConvertible (Type atype, Type gc, Type ptype)
+ {
+ 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 static bool CheckConstraints (EmitContext ec, MethodBase definition,
+ MethodBase instantiated, Location loc)
+ {
+ MethodConstraintChecker checker = new MethodConstraintChecker (
+ definition, definition.GetGenericArguments (),
+ instantiated.GetGenericArguments (), loc);
+
+ return checker.CheckConstraints (ec);
+ }
+
+ public static bool CheckConstraints (EmitContext ec, Type gt, Type[] gen_params,
+ Type[] atypes, Location loc)
+ {
+ TypeConstraintChecker checker = new TypeConstraintChecker (
+ gt, gen_params, atypes, loc);
+
+ return checker.CheckConstraints (ec);
+ }
+
+ protected class MethodConstraintChecker : ConstraintChecker
+ {
+ MethodBase definition;
+
+ public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
+ Type[] atypes, Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.definition = definition;
+ }
+
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpSignature (definition);
+ }
+
+ protected override void Report_SymbolRelatedToPreviousError ()
+ {
+ Report.SymbolRelatedToPreviousError (definition);
+ }
+ }
+
+ protected class TypeConstraintChecker : ConstraintChecker
+ {
+ Type gt;
+
+ public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
+ Location loc)
+ : base (gen_params, atypes, loc)
+ {
+ this.gt = gt;
+ }
+
+ protected override string GetSignatureForError ()
+ {
+ return TypeManager.CSharpName (gt);
+ }
+
+ 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 ()
{
throw new Exception ();
}
- public override bool Define (TypeContainer parent)
+ 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 (TypeContainer parent, MethodBuilder mb)
+ /// <summary>
+ /// Define and resolve the type parameters.
+ /// We're called from Method.Define().
+ /// </summary>
+ public bool Define (MethodBuilder mb)
{
- if (!Define (parent))
- 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]);
+ if (!Define ())
+ return false;
+
+ for (int i = 0; i < TypeParameters.Length; i++) {
+ if (!TypeParameters [i].ResolveType (ec))
+ return false;
+ }
+
return true;
}
- public bool DefineType (EmitContext ec, MethodBuilder mb)
+ /// <summary>
+ /// We're called from MethodData.Define() after creating the MethodBuilder.
+ /// </summary>
+ public bool DefineType (EmitContext ec, MethodBuilder mb,
+ MethodInfo implementing, bool is_override)
{
for (int i = 0; i < TypeParameters.Length; i++)
- if (!TypeParameters [i].DefineType (ec))
+ if (!TypeParameters [i].DefineType (
+ 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, false) == 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 bool DefineMembers ()
{
return true;
}
public override MemberCache MemberCache {
get {
- throw new Exception ();
+ return null;
}
}
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
- // FIXME
- }
-
- protected override void VerifyObsoleteAttribute()
- {
- // FIXME
+ base.ApplyAttributeBuilder (a, cb);
}
public override AttributeTargets AttributeTargets {
return AttributeTargets.Method | AttributeTargets.ReturnValue;
}
}
+
+ public override string DocCommentHeader {
+ get { return "M:"; }
+ }
}
public class DefaultValueExpression : Expression
{
Expression expr;
- LocalTemporary temp_storage;
public DefaultValueExpression (Expression expr, Location loc)
{
public override Expression DoResolve (EmitContext ec)
{
- type = ec.DeclSpace.ResolveType (expr, false, loc);
- if (type == null)
+ TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
return null;
- if (type.IsGenericParameter || TypeManager.IsValueType (type))
- temp_storage = new LocalTemporary (ec, type);
+ type = texpr.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);
ec.ig.Emit (OpCodes.Ldnull);
}
}
+
+ public class NullableType : TypeExpr
+ {
+ Expression underlying;
+
+ public NullableType (Expression underlying, Location l)
+ {
+ this.underlying = underlying;
+ loc = l;
+
+ eclass = ExprClass.Type;
+ }
+
+ public NullableType (Type type, Location loc)
+ : this (new TypeExpression (type, loc), loc)
+ { }
+
+ public override string Name {
+ get { return underlying.ToString () + "?"; }
+ }
+
+ public override string FullName {
+ get { return underlying.ToString () + "?"; }
+ }
+
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ {
+ TypeArguments args = new TypeArguments (loc);
+ args.Add (underlying);
+
+ ConstructedType ctype = new ConstructedType (TypeManager.generic_nullable_type, args, loc);
+ return ctype.ResolveAsTypeTerminal (ec, false);
+ }
+ }
+
+ public partial class TypeManager
+ {
+ //
+ // A list of core types that the compiler requires or uses
+ //
+ static public Type activator_type;
+ static public Type generic_ienumerator_type;
+ static public Type generic_ienumerable_type;
+ static public Type generic_nullable_type;
+
+ // <remarks>
+ // Tracks the generic parameters.
+ // </remarks>
+ static PtrHashtable builder_to_type_param;
+
+ //
+ // These methods are called by code generated by the compiler
+ //
+ static public MethodInfo activator_create_instance;
+
+ static void InitGenerics ()
+ {
+ builder_to_type_param = new PtrHashtable ();
+ }
+
+ static void CleanUpGenerics ()
+ {
+ builder_to_type_param = null;
+ }
+
+ static void InitGenericCoreTypes ()
+ {
+ 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);
+ }
+
+ static void InitGenericCodeHelpers ()
+ {
+ // Activator
+ Type [] type_arg = { type_type };
+ activator_create_instance = GetMethod (
+ activator_type, "CreateInstance", type_arg);
+ }
+
+ static Type CoreLookupType (string ns, string name, int arity)
+ {
+ return CoreLookupType (ns, MemberName.MakeName (name, arity));
+ }
+
+ public static void AddTypeParameter (Type t, TypeParameter tparam)
+ {
+ if (!builder_to_type_param.Contains (t))
+ builder_to_type_param.Add (t, tparam);
+ }
+
+ public static TypeContainer LookupGenericTypeContainer (Type t)
+ {
+ t = DropGenericTypeArguments (t);
+ return LookupTypeContainer (t);
+ }
+
+ public static TypeParameter LookupTypeParameter (Type t)
+ {
+ return (TypeParameter) builder_to_type_param [t];
+ }
+
+ public static GenericConstraints GetTypeParameterConstraints (Type t)
+ {
+ if (!t.IsGenericParameter)
+ throw new InvalidOperationException ();
+
+ TypeParameter tparam = LookupTypeParameter (t);
+ if (tparam != null)
+ return tparam.GenericConstraints;
+
+ return ReflectionConstraints.GetConstraints (t);
+ }
+
+ public static bool HasGenericArguments (Type t)
+ {
+ return GetNumberOfTypeArguments (t) > 0;
+ }
+
+ 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.IsGenericType ? t.GetGenericArguments ().Length : 0;
+ }
+
+ public static Type[] GetTypeArguments (Type t)
+ {
+ DeclSpace tc = LookupDeclSpace (t);
+ if (tc != null) {
+ if (!tc.IsGeneric)
+ return Type.EmptyTypes;
+
+ TypeParameter[] tparam = tc.TypeParameters;
+ Type[] ret = new Type [tparam.Length];
+ for (int i = 0; i < tparam.Length; i++) {
+ ret [i] = tparam [i].Type;
+ if (ret [i] == null)
+ throw new InternalErrorException ();
+ }
+
+ return ret;
+ } else
+ 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 ();
+ }
+
+ public static MethodBase DropGenericMethodArguments (MethodBase m)
+ {
+ if (m.IsGenericMethodDefinition)
+ return m;
+ if (m.IsGenericMethod)
+ return ((MethodInfo) m).GetGenericMethodDefinition ();
+ if (!m.DeclaringType.IsGenericType)
+ return m;
+
+ Type t = m.DeclaringType.GetGenericTypeDefinition ();
+ BindingFlags bf = BindingFlags.Public | BindingFlags.NonPublic |
+ BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly;
+
+ if (m is ConstructorInfo) {
+ foreach (ConstructorInfo c in t.GetConstructors (bf))
+ if (c.MetadataToken == m.MetadataToken)
+ return c;
+ } else {
+ foreach (MethodBase mb in t.GetMethods (bf))
+ if (mb.MetadataToken == m.MetadataToken)
+ return mb;
+ }
+
+ return m;
+ }
+
+ public static FieldInfo GetGenericFieldDefinition (FieldInfo fi)
+ {
+ if (fi.DeclaringType.IsGenericTypeDefinition ||
+ !fi.DeclaringType.IsGenericType)
+ return fi;
+
+ Type t = fi.DeclaringType.GetGenericTypeDefinition ();
+ BindingFlags bf = BindingFlags.Public | BindingFlags.NonPublic |
+ BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly;
+
+ foreach (FieldInfo f in t.GetFields (bf))
+ if (f.MetadataToken == fi.MetadataToken)
+ return f;
+
+ return fi;
+ }
+
+ //
+ // 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.IsGenericType)
+ 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 true;
+
+ if (a.IsGenericParameter && b.IsGenericParameter) {
+ if (a.DeclaringMethod != b.DeclaringMethod &&
+ (a.DeclaringMethod == null || b.DeclaringMethod == null))
+ return false;
+ return a.GenericParameterPosition == b.GenericParameterPosition;
+ }
+
+ if (a.IsArray && b.IsArray) {
+ if (a.GetArrayRank () != b.GetArrayRank ())
+ return false;
+ return IsEqual (a.GetElementType (), b.GetElementType ());
+ }
+
+ if (a.IsByRef && b.IsByRef)
+ return IsEqual (a.GetElementType (), b.GetElementType ());
+
+ if (a.IsGenericType && b.IsGenericType) {
+ if (a.GetGenericTypeDefinition () != b.GetGenericTypeDefinition ())
+ return false;
+
+ Type[] aargs = a.GetGenericArguments ();
+ Type[] bargs = b.GetGenericArguments ();
+
+ if (aargs.Length != bargs.Length)
+ return false;
+
+ for (int i = 0; i < aargs.Length; i++) {
+ if (!IsEqual (aargs [i], bargs [i]))
+ return false;
+ }
+
+ return true;
+ }
+
+ //
+ // This is to build with the broken circular dependencies between
+ // System and System.Configuration in the 2.x profile where we
+ // end up with a situation where:
+ //
+ // System on the second build is referencing the System.Configuration
+ // that has references to the first System build.
+ //
+ // Point in case: NameValueCollection built on the first pass, vs
+ // NameValueCollection build on the second one. The problem is that
+ // we need to override some methods sometimes, or we need to
+ //
+ if (RootContext.BrokenCircularDeps){
+ if (a.Name == b.Name && a.Namespace == b.Namespace){
+ Console.WriteLine ("GonziMatch: {0}.{1}", a.Namespace, a.Name);
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /// <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) {
+ //
+ // If a is an array of a's type, they may never
+ // become equal.
+ //
+ while (b.IsArray) {
+ b = b.GetElementType ();
+ if (a.Equals (b))
+ return false;
+ }
+
+ //
+ // If b is a generic parameter or an actual type,
+ // they may become equal:
+ //
+ // class X<T,U> : I<T>, I<U>
+ // class X<T> : I<T>, I<float>
+ //
+ if (b.IsGenericParameter || !b.IsGenericType) {
+ int pos = a.GenericParameterPosition;
+ Type[] args = a.DeclaringMethod != null ? method_infered : class_infered;
+ if (args [pos] == null) {
+ args [pos] = b;
+ return true;
+ }
+
+ return args [pos] == a;
+ }
+
+ //
+ // We're now comparing a type parameter with a
+ // generic instance. They may become equal unless
+ // the type parameter appears anywhere in the
+ // generic instance:
+ //
+ // class X<T,U> : I<T>, I<X<U>>
+ // -> error because you could instanciate it as
+ // X<X<int>,int>
+ //
+ // class X<T> : I<T>, I<X<T>> -> ok
+ //
+
+ Type[] bargs = GetTypeArguments (b);
+ for (int i = 0; i < bargs.Length; i++) {
+ if (a.Equals (bargs [i]))
+ return false;
+ }
+
+ return true;
+ }
+
+ if (b.IsGenericParameter)
+ return MayBecomeEqualGenericTypes (b, a, class_infered, method_infered);
+
+ //
+ // At this point, neither a nor b are a type parameter.
+ //
+ // If one of them is a generic instance, let
+ // MayBecomeEqualGenericInstances() compare them (if the
+ // other one is not a generic instance, they can never
+ // become equal).
+ //
+
+ if (a.IsGenericType || b.IsGenericType)
+ return MayBecomeEqualGenericInstances (a, b, class_infered, method_infered);
+
+ //
+ // If both of them are arrays.
+ //
+
+ if (a.IsArray && b.IsArray) {
+ if (a.GetArrayRank () != b.GetArrayRank ())
+ return false;
+
+ a = a.GetElementType ();
+ b = b.GetElementType ();
+
+ return MayBecomeEqualGenericTypes (a, b, class_infered, method_infered);
+ }
+
+ //
+ // Ok, two ordinary types.
+ //
+
+ return a.Equals (b);
+ }
+
+ //
+ // Checks whether two generic instances may become equal for some
+ // particular instantiation (26.3.1).
+ //
+ public static bool MayBecomeEqualGenericInstances (Type a, Type b,
+ Type[] class_infered,
+ Type[] method_infered)
+ {
+ if (!a.IsGenericType || !b.IsGenericType)
+ return false;
+ if (a.GetGenericTypeDefinition () != b.GetGenericTypeDefinition ())
+ return false;
+
+ return MayBecomeEqualGenericInstances (
+ GetTypeArguments (a), GetTypeArguments (b), class_infered, method_infered);
+ }
+
+ public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
+ Type[] class_infered,
+ Type[] method_infered)
+ {
+ if (aargs.Length != bargs.Length)
+ return false;
+
+ for (int i = 0; i < aargs.Length; i++) {
+ if (!MayBecomeEqualGenericTypes (aargs [i], bargs [i], class_infered, method_infered))
+ return false;
+ }
+
+ return true;
+ }
+
+ /// <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 (tcount != pcount)
+ return false;
+
+ type = DropGenericTypeArguments (type);
+ parent = DropGenericTypeArguments (parent);
+
+ return type.Equals (parent);
+ }
+
+ /// <summary>
+ /// Whether `mb' is a generic method definition.
+ /// </summary>
+ public static bool IsGenericMethodDefinition (MethodBase mb)
+ {
+ if (mb.DeclaringType is TypeBuilder) {
+ IMethodData method = (IMethodData) builder_to_method [mb];
+ if (method == null)
+ return false;
+
+ return method.GenericMethod != null;
+ }
+
+ return mb.IsGenericMethodDefinition;
+ }
+
+ /// <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];
+ if (method == null)
+ return false;
+
+ return method.GenericMethod != null;
+ }
+
+ return mb.IsGenericMethod;
+ }
+
+ //
+ // Type inference.
+ //
+
+ static bool InferType (Type pt, Type at, Type[] infered)
+ {
+ if (pt == at)
+ return true;
+
+ if (pt.IsGenericParameter) {
+ if (pt.DeclaringMethod == null)
+ return false;
+
+ int pos = pt.GenericParameterPosition;
+
+ if (infered [pos] == null) {
+ Type check = at;
+ while (check.IsArray)
+ check = check.GetElementType ();
+
+ if (pt == check)
+ return false;
+
+ infered [pos] = at;
+ return true;
+ }
+
+ if (infered [pos] != at)
+ return false;
+
+ return true;
+ }
+
+ if (!pt.ContainsGenericParameters) {
+ if (at.ContainsGenericParameters)
+ return InferType (at, pt, infered);
+ else
+ return true;
+ }
+
+ if (at.IsArray) {
+ if (pt.IsArray) {
+ if (at.GetArrayRank () != pt.GetArrayRank ())
+ return false;
+
+ return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ }
+
+ if (!pt.IsGenericType ||
+ (pt.GetGenericTypeDefinition () != generic_ienumerable_type))
+ return false;
+
+ Type[] args = GetTypeArguments (pt);
+ return InferType (args [0], at.GetElementType (), infered);
+ }
+
+ if (pt.IsArray) {
+ if (!at.IsArray ||
+ (pt.GetArrayRank () != at.GetArrayRank ()))
+ return false;
+
+ return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ }
+
+ if (pt.IsByRef && at.IsByRef)
+ return InferType (pt.GetElementType (), at.GetElementType (), infered);
+ ArrayList list = new ArrayList ();
+ if (at.IsGenericType)
+ list.Add (at);
+ for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
+ list.Add (bt);
+
+ list.AddRange (TypeManager.GetInterfaces (at));
+
+ bool found_one = false;
+
+ foreach (Type type in list) {
+ if (!type.IsGenericType)
+ continue;
+
+ Type[] infered_types = new Type [infered.Length];
+
+ if (!InferGenericInstance (pt, type, infered_types))
+ continue;
+
+ for (int i = 0; i < infered_types.Length; i++) {
+ if (infered [i] == null) {
+ infered [i] = infered_types [i];
+ continue;
+ }
+
+ if (infered [i] != infered_types [i])
+ return false;
+ }
+
+ found_one = true;
+ }
+
+ return found_one;
+ }
+
+ static bool InferGenericInstance (Type pt, Type at, Type[] infered_types)
+ {
+ Type[] at_args = at.GetGenericArguments ();
+ Type[] pt_args = pt.GetGenericArguments ();
+
+ if (at_args.Length != pt_args.Length)
+ return false;
+
+ for (int i = 0; i < at_args.Length; i++) {
+ if (!InferType (pt_args [i], at_args [i], infered_types))
+ return false;
+ }
+
+ for (int i = 0; i < infered_types.Length; i++) {
+ if (infered_types [i] == null)
+ return 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)
+ {
+ if ((arguments == null) || !TypeManager.IsGenericMethod (method))
+ return true;
+
+ int arg_count;
+
+ if (arguments == null)
+ arg_count = 0;
+ else
+ arg_count = arguments.Count;
+
+ ParameterData pd = TypeManager.GetParameterData (method);
+
+ int pd_count = pd.Count;
+
+ if (pd_count == 0)
+ return false;
+
+ if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
+ return false;
+
+ if (pd_count - 1 > arg_count)
+ return false;
+
+ if (pd_count == 1 && arg_count == 0)
+ return true;
+
+ Type[] method_args = method.GetGenericArguments ();
+ Type[] infered_types = new Type [method_args.Length];
+
+ //
+ // If we have come this far, the case which
+ // remains is when the number of parameters is
+ // less than or equal to the argument count.
+ //
+ for (int i = 0; i < pd_count - 1; ++i) {
+ Argument a = (Argument) arguments [i];
+
+ if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ continue;
+
+ Type pt = pd.ParameterType (i);
+ Type at = a.Type;
+
+ if (!InferType (pt, at, infered_types))
+ return false;
+ }
+
+ Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
+
+ for (int i = pd_count - 1; i < arg_count; i++) {
+ Argument a = (Argument) arguments [i];
+
+ if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
+ continue;
+
+ if (!InferType (element_type, a.Type, infered_types))
+ return false;
+ }
+
+ for (int i = 0; i < infered_types.Length; i++)
+ if (infered_types [i] == null)
+ return false;
+
+ method = ((MethodInfo)method).MakeGenericMethod (infered_types);
+ return true;
+ }
+
+ static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
+ Type[] infered_types)
+ {
+ if (infered_types == null)
+ return false;
+
+ for (int i = 0; i < arg_types.Length; i++) {
+ if (arg_types [i] == null)
+ continue;
+
+ if (!InferType (param_types [i], arg_types [i], infered_types))
+ return false;
+ }
+
+ for (int i = 0; i < infered_types.Length; i++)
+ if (infered_types [i] == 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)
+ {
+ if (!TypeManager.IsGenericMethod (method))
+ return true;
+
+ int arg_count;
+ if (arguments != null)
+ arg_count = arguments.Count;
+ else
+ arg_count = 0;
+
+ ParameterData pd = TypeManager.GetParameterData (method);
+ if (arg_count != pd.Count)
+ return false;
+
+ Type[] method_args = method.GetGenericArguments ();
+
+ bool is_open = false;
+ for (int i = 0; i < method_args.Length; i++) {
+ if (method_args [i].IsGenericParameter) {
+ is_open = true;
+ break;
+ }
+ }
+ if (!is_open)
+ return true;
+
+ Type[] infered_types = new Type [method_args.Length];
+
+ Type[] param_types = new Type [pd.Count];
+ Type[] arg_types = new Type [pd.Count];
+
+ for (int i = 0; i < arg_count; i++) {
+ param_types [i] = pd.ParameterType (i);
+
+ Argument a = (Argument) arguments [i];
+ 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 = ((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 = TypeManager.GetParameterData (method);
+ if (apd.Count != pd.Count)
+ return false;
+
+ Type[] method_args = method.GetGenericArguments ();
+ Type[] infered_types = new Type [method_args.Length];
+
+ Type[] param_types = new Type [pd.Count];
+ Type[] arg_types = new Type [pd.Count];
+
+ for (int i = 0; i < apd.Count; i++) {
+ param_types [i] = pd.ParameterType (i);
+ arg_types [i] = apd.ParameterType (i);
+ }
+
+ if (!InferTypeArguments (param_types, arg_types, infered_types))
+ return false;
+
+ method = ((MethodInfo)method).MakeGenericMethod (infered_types);
+ return true;
+ }
+
+ public static bool IsNullableType (Type t)
+ {
+ return generic_nullable_type == DropGenericTypeArguments (t);
+ }
+ }
+
+ public abstract class Nullable
+ {
+ protected sealed class NullableInfo
+ {
+ public readonly Type Type;
+ public readonly Type UnderlyingType;
+ public readonly MethodInfo HasValue;
+ public readonly MethodInfo Value;
+ public readonly ConstructorInfo Constructor;
+
+ public NullableInfo (Type type)
+ {
+ Type = type;
+ UnderlyingType = TypeManager.GetTypeArguments (type) [0];
+
+ 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);
+ Constructor = type.GetConstructor (new Type[] { UnderlyingType });
+ }
+ }
+
+ protected class Unwrap : Expression, IMemoryLocation, IAssignMethod
+ {
+ Expression expr;
+ NullableInfo info;
+
+ LocalTemporary temp;
+ bool has_temp;
+
+ public Unwrap (Expression expr, Location loc)
+ {
+ this.expr = expr;
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ temp = new LocalTemporary (ec, expr.Type);
+
+ info = new NullableInfo (expr.Type);
+ type = info.UnderlyingType;
+ eclass = expr.eclass;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ AddressOf (ec, AddressOp.LoadStore);
+ ec.ig.EmitCall (OpCodes.Call, info.Value, null);
+ }
+
+ public void EmitCheck (EmitContext ec)
+ {
+ AddressOf (ec, AddressOp.LoadStore);
+ ec.ig.EmitCall (OpCodes.Call, info.HasValue, null);
+ }
+
+ public void Store (EmitContext ec)
+ {
+ create_temp (ec);
+ }
+
+ 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 EmitAssign (EmitContext ec, Expression source,
+ bool leave_copy, bool prepare_for_load)
+ {
+ InternalWrap wrap = new InternalWrap (source, info, loc);
+ ((IAssignMethod) expr).EmitAssign (ec, wrap, leave_copy, false);
+ }
+
+ protected class InternalWrap : Expression
+ {
+ public Expression expr;
+ public NullableInfo info;
+
+ public InternalWrap (Expression expr, NullableInfo info, Location loc)
+ {
+ this.expr = expr;
+ this.info = info;
+ this.loc = loc;
+
+ type = info.Type;
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ expr.Emit (ec);
+ ec.ig.Emit (OpCodes.Newobj, info.Constructor);
+ }
+ }
+ }
+
+ protected class Wrap : Expression
+ {
+ Expression expr;
+ NullableInfo info;
+
+ public Wrap (Expression expr, Location loc)
+ {
+ this.expr = expr;
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ TypeExpr target_type = new NullableType (expr.Type, loc);
+ target_type = target_type.ResolveAsTypeTerminal (ec, false);
+ if (target_type == null)
+ return null;
+
+ type = target_type.Type;
+ info = new NullableInfo (type);
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ expr.Emit (ec);
+ ec.ig.Emit (OpCodes.Newobj, info.Constructor);
+ }
+ }
+
+ public class NullableLiteral : Expression, IMemoryLocation {
+ public NullableLiteral (Type target_type, Location loc)
+ {
+ this.type = target_type;
+ this.loc = loc;
+
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ LocalTemporary value_target = new LocalTemporary (ec, type);
+
+ value_target.AddressOf (ec, AddressOp.Store);
+ ec.ig.Emit (OpCodes.Initobj, type);
+ value_target.Emit (ec);
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp Mode)
+ {
+ LocalTemporary value_target = new LocalTemporary (ec, type);
+
+ value_target.AddressOf (ec, AddressOp.Store);
+ ec.ig.Emit (OpCodes.Initobj, type);
+ ((IMemoryLocation) value_target).AddressOf (ec, Mode);
+ }
+ }
+
+ public abstract class Lifted : Expression, IMemoryLocation
+ {
+ Expression expr, underlying, wrap, null_value;
+ Unwrap unwrap;
+
+ protected Lifted (Expression expr, Location loc)
+ {
+ this.expr = expr;
+ this.loc = loc;
+ }
+
+ 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 = ResolveUnderlying (unwrap, ec);
+ if (underlying == null)
+ return null;
+
+ wrap = new Wrap (underlying, loc).Resolve (ec);
+ if (wrap == null)
+ return null;
+
+ null_value = new NullableLiteral (wrap.Type, loc).Resolve (ec);
+ if (null_value == null)
+ return null;
+
+ type = wrap.Type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ protected abstract Expression ResolveUnderlying (Expression unwrap, EmitContext ec);
+
+ 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);
+
+ wrap.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (is_null_label);
+ null_value.Emit (ec);
+
+ ig.MarkLabel (end_label);
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ unwrap.AddressOf (ec, mode);
+ }
+ }
+
+ public class LiftedConversion : Lifted
+ {
+ public readonly bool IsUser;
+ public readonly bool IsExplicit;
+ public readonly Type TargetType;
+
+ public LiftedConversion (Expression expr, Type target_type, bool is_user,
+ bool is_explicit, Location loc)
+ : base (expr, loc)
+ {
+ this.IsUser = is_user;
+ this.IsExplicit = is_explicit;
+ this.TargetType = target_type;
+ }
+
+ protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
+ {
+ Type type = TypeManager.GetTypeArguments (TargetType) [0];
+
+ if (IsUser) {
+ return Convert.UserDefinedConversion (ec, unwrap, type, loc, IsExplicit);
+ } else {
+ if (IsExplicit)
+ return Convert.ExplicitConversion (ec, unwrap, type, loc);
+ else
+ return Convert.ImplicitConversion (ec, unwrap, type, loc);
+ }
+ }
+ }
+
+ public class LiftedUnaryOperator : Lifted
+ {
+ public readonly Unary.Operator Oper;
+
+ public LiftedUnaryOperator (Unary.Operator op, Expression expr, Location loc)
+ : base (expr, loc)
+ {
+ this.Oper = op;
+ }
+
+ protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
+ {
+ return new Unary (Oper, unwrap, loc);
+ }
+ }
+
+ public class LiftedConditional : Lifted
+ {
+ Expression true_expr, false_expr;
+
+ public LiftedConditional (Expression expr, Expression true_expr, Expression false_expr,
+ Location loc)
+ : base (expr, loc)
+ {
+ this.true_expr = true_expr;
+ this.false_expr = false_expr;
+ }
+
+ protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
+ {
+ return new Conditional (unwrap, true_expr, false_expr);
+ }
+ }
+
+ public class LiftedBinaryOperator : Expression
+ {
+ public readonly Binary.Operator Oper;
+
+ Expression left, right, original_left, original_right;
+ Expression 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)
+ {
+ this.Oper = op;
+ this.left = original_left = left;
+ this.right = original_right = right;
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (TypeManager.IsNullableType (left.Type)) {
+ left_unwrap = new Unwrap (left, loc);
+ left = left_unwrap.Resolve (ec);
+ if (left == null)
+ return null;
+ }
+
+ if (TypeManager.IsNullableType (right.Type)) {
+ right_unwrap = new Unwrap (right, loc);
+ right = right_unwrap.Resolve (ec);
+ if (right == null)
+ return null;
+ }
+
+ if ((Oper == Binary.Operator.LogicalAnd) ||
+ (Oper == Binary.Operator.LogicalOr)) {
+ Binary.Error_OperatorCannotBeApplied (
+ loc, Binary.OperName (Oper),
+ original_left.GetSignatureForError (),
+ original_right.GetSignatureForError ());
+ return null;
+ }
+
+ if (((Oper == Binary.Operator.BitwiseAnd) || (Oper == Binary.Operator.BitwiseOr)) &&
+ ((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;
+ }
+
+ 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);
+ }
+
+ 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 (left_unwrap != null)
+ left_unwrap.Store (ec);
+ if (right_unwrap != null)
+ right_unwrap.Store (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);
+ 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);
+ null_value.Emit (ec);
+
+ 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