//
-// 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 {
+ public abstract class GenericConstraints {
+ 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.ValueTypeConstraint) != 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,
}
}
- bool has_ctor_constraint;
- bool has_reference_type;
- bool has_value_type;
+ GenericParameterAttributes attrs;
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;
- public bool HasConstructorConstraint {
- get { return has_ctor_constraint; }
- }
-
- public bool Resolve (DeclSpace ds)
+ public bool Resolve (EmitContext ec)
{
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.ValueTypeConstraint;
continue;
}
- TypeExpr expr = ds.ResolveTypeExpr ((Expression) obj, false, loc);
+ 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}'", obj);
+ return false;
+ }
+
+ TypeExpr expr;
+ ConstructedType cexpr = fn as ConstructedType;
+ if (cexpr != null) {
+ if (!cexpr.ResolveConstructedType (ec))
+ return false;
+
+ expr = cexpr;
+ } else
+ expr = fn.ResolveAsTypeTerminal (ec);
+
if (expr == null)
return false;
"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);
if (constraints == null)
return true;
- if (constraints.IsValueType) {
+ if (constraints.HasValueTypeConstraint) {
Report.Error (456, loc, "Type parameter `{0}' has " +
"the `struct' constraint, so it cannot " +
"be used as a constraint for `{1}'",
public bool ResolveTypes (EmitContext ec)
{
+ if (effective_base_type != null)
+ return 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))
ArrayList list = new ArrayList ();
foreach (TypeExpr iface_constraint in iface_constraints) {
- Type resolved = iface_constraint.ResolveType (ec);
- if (resolved == null)
- return false;
-
foreach (Type type in list) {
- if (!type.Equals (resolved))
+ if (!type.Equals (iface_constraint.Type))
continue;
Report.Error (405, loc,
"Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", resolved, name);
+ "parameter `{1}'.", iface_constraint.Type,
+ name);
return false;
}
- list.Add (resolved);
+ TypeExpr te = iface_constraint.ResolveAsTypeTerminal (ec);
+ if (te == null)
+ return false;
+
+ list.Add (te.Type);
}
foreach (TypeParameterExpr expr in type_param_constraints) {
- Type resolved = expr.ResolveType (ec);
- if (resolved == null)
- return false;
-
foreach (Type type in list) {
- if (!type.Equals (resolved))
+ if (!type.Equals (expr.Type))
continue;
Report.Error (405, loc,
"Duplicate constraint `{0}' for type " +
- "parameter `{1}'.", resolved, name);
+ "parameter `{1}'.", expr.Type, name);
return false;
}
- list.Add (resolved);
+ list.Add (expr.Type);
}
- iface_constraint_types = new Type [list.Count];
- list.CopyTo (iface_constraint_types, 0);
+ ArrayList new_list = new ArrayList ();
+ foreach (Type iface in list) {
+ if (new_list.Contains (iface))
+ continue;
+
+ new_list.Add (iface);
+
+ Type [] implementing = TypeManager.GetInterfaces (iface);
+
+ foreach (Type imp in implementing) {
+ if (!new_list.Contains (imp))
+ new_list.Add (imp);
+ }
+ }
+
+ iface_constraint_types = new Type [new_list.Count];
+ new_list.CopyTo (iface_constraint_types, 0);
if (class_constraint != null) {
- class_constraint_type = class_constraint.ResolveType (ec);
+ TypeExpr te = class_constraint.ResolveAsTypeTerminal (ec);
+ if (te == null)
+ return false;
+
+ class_constraint_type = te.Type;
if (class_constraint_type == null)
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;
return true;
}
if (constraints == null)
return true;
- if (IsValueType && constraints.HasClassConstraint) {
+ if (HasValueTypeConstraint && constraints.HasClassConstraint) {
Report.Error (455, loc, "Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
name, constraints.ClassConstraint,
Type t2 = constraints.ClassConstraint;
TypeExpr e2 = constraints.class_constraint;
- if (!Convert.ImplicitReferenceConversionExists (e1, t2) &&
- !Convert.ImplicitReferenceConversionExists (e2, t1)) {
+ if (!Convert.ImplicitReferenceConversionExists (ec, e1, t2) &&
+ !Convert.ImplicitReferenceConversionExists (ec, e2, t1)) {
Report.Error (455, loc,
"Type parameter `{0}' inherits " +
"conflicting constraints `{1}' and `{2}'",
public void Define (GenericTypeParameterBuilder type)
{
- if (has_ctor_constraint)
- type.Mono_SetConstructorConstraint ();
- if (has_reference_type)
- type.Mono_SetReferenceTypeConstraint ();
- else if (has_value_type)
- type.Mono_SetValueTypeConstraint ();
+ type.SetGenericParameterAttributes (attrs);
}
- public bool HasConstructor {
- get { return has_ctor_constraint; }
+ public override GenericParameterAttributes Attributes {
+ get { return attrs; }
}
- public bool IsReferenceType {
- get { return has_reference_type; }
+ public override bool HasClassConstraint {
+ get { return class_constraint != null; }
}
- public bool IsValueType {
- get { return has_value_type; }
- }
-
- public bool HasClassConstraint {
- get { return class_constraint_type != null; }
- }
-
- public Type ClassConstraint {
+ public override Type ClassConstraint {
get { return class_constraint_type; }
}
- public Type[] InterfaceConstraints {
+ public override Type[] InterfaceConstraints {
get { return iface_constraint_types; }
}
+ public override Type EffectiveBaseClass {
+ get { return effective_base_type; }
+ }
+
internal bool IsSubclassOf (Type t)
{
if ((class_constraint_type != null) &&
public bool CheckInterfaceMethod (EmitContext ec, GenericConstraints gc)
{
- if (!ResolveTypes (ec))
+ if (gc.Attributes != attrs)
return false;
- if (gc.HasConstructor != HasConstructor)
- return false;
- if (gc.IsReferenceType != IsReferenceType)
- return false;
- if (gc.IsValueType != IsValueType)
+ if (HasClassConstraint != gc.HasClassConstraint)
return false;
- if (gc.HasClassConstraint != HasClassConstraint)
- return false;
-
- if (HasClassConstraint && !gc.ClassConstraint.Equals (ClassConstraint))
+ if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
return false;
int gc_icount = gc.InterfaceConstraints != null ?
foreach (Type iface in gc.InterfaceConstraints) {
bool ok = false;
foreach (Type check in InterfaceConstraints) {
- if (iface.Equals (check)) {
+ if (TypeManager.IsEqual (iface, check)) {
ok = true;
break;
}
//
// This type represents a generic type parameter
//
- public class TypeParameter : IMemberContainer {
+ public class TypeParameter : MemberCore, IMemberContainer {
string name;
+ GenericConstraints gc;
Constraints constraints;
Location loc;
GenericTypeParameterBuilder type;
- public TypeParameter (string name, Constraints constraints, Location loc)
+ public TypeParameter (TypeContainer parent, string name,
+ Constraints constraints, Location loc)
+ : base (parent, new MemberName (name), null, loc)
{
this.name = name;
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 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)
{
+ if (this.type != null)
+ throw new InvalidOperationException ();
+
this.type = type;
- Type[] ifaces = null;
+ TypeManager.AddTypeParameter (type, this);
+ }
+
+ public void DefineConstraints ()
+ {
if (constraints != null)
constraints.Define (type);
- TypeManager.AddTypeParameter (type, this);
+ }
+
+ public bool ResolveType (EmitContext ec)
+ {
+ if (constraints != null) {
+ if (!constraints.ResolveTypes (ec)) {
+ constraints = null;
+ return false;
+ }
+ }
+
+ return true;
}
public bool DefineType (EmitContext ec)
public bool DefineType (EmitContext ec, MethodBuilder builder,
MethodInfo implementing, bool is_override)
{
- GenericConstraints gc;
+ if (!ResolveType (ec))
+ return false;
if (implementing != null) {
if (is_override && (constraints != null)) {
mb = mb.GetGenericMethodDefinition ();
int pos = type.GenericParameterPosition;
- ParameterData pd = Invocation.GetParameterData (mb);
- gc = pd.GenericConstraints (pos);
+ ParameterData pd = TypeManager.GetParameterData (mb);
+ GenericConstraints temp_gc = pd.GenericConstraints (pos);
Type mparam = mb.GetGenericArguments () [pos];
- if (((constraints != null) && (gc == null)) ||
- ((constraints == null) && (gc != null)) ||
- ((constraints != null) &&
- !constraints.CheckInterfaceMethod (ec, gc))) {
+ 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 (!ok) {
Report.SymbolRelatedToPreviousError (implementing);
Report.Error (
return false;
}
} else {
- if (constraints != null) {
- if (!constraints.ResolveTypes (ec))
- return false;
- }
-
gc = (GenericConstraints) constraints;
}
return true;
}
+ 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 (type == null)
+ throw new InvalidOperationException ();
+
+ if (constraints == null) {
+ new_constraints = constraints;
+ return true;
+ } else if (new_constraints == null)
+ return true;
+
+ if (!new_constraints.Resolve (ec))
+ return false;
+ if (!new_constraints.ResolveTypes (ec))
+ return false;
+
+ return constraints.CheckInterfaceMethod (ec, new_constraints);
+ }
+
+ public override string DocCommentHeader {
+ get {
+ throw new InvalidOperationException (
+ "Unexpected attempt to get doc comment from " + this.GetType () + ".");
+ }
+ }
+
+ //
+ // MemberContainer
+ //
+
+ public override bool Define ()
+ {
+ return true;
+ }
+
+ protected override void VerifyObsoleteAttribute ()
+ { }
+
+ public override void ApplyAttributeBuilder (Attribute a,
+ CustomAttributeBuilder cb)
+ { }
+
+ public override AttributeTargets AttributeTargets {
+ get {
+ return (AttributeTargets) 0;
+ }
+ }
+
+ public override string[] ValidAttributeTargets {
+ get {
+ return new string [0];
+ }
+ }
+
//
// IMemberContainer
//
- IMemberContainer IMemberContainer.ParentContainer {
+ string IMemberContainer.Name {
+ get { return Name; }
+ }
+
+ MemberCache IMemberContainer.BaseCache {
get { return null; }
}
{
return "TypeParameter[" + name + "]";
}
+
+ 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 = gc;
+
+ dargs = TypeManager.GetTypeArguments (declaring);
+
+ 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.IsGenericInstance) {
+ t = t.GetGenericTypeDefinition ();
+ t = t.BindGenericParameters (dargs);
+ }
+
+ return t;
+ }
+
+ 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; }
+ }
+ }
}
//
}
}
+ 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;
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");
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);
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;
}
+
+ atypes [i] = te.Type;
}
return ok;
}
}
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)
+ public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
{
loc = l;
- this.name = MemberName.MakeName (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;
{
gt = t.GetGenericTypeDefinition ();
- this.name = gt.FullName;
+ this.name = new TypeExpression (gt, l);
full_name = gt.FullName + "<" + args.ToString () + ">";
}
{
gt = t.GetGenericTypeDefinition ();
- this.name = gt.FullName;
+ this.name = new TypeExpression (gt, l);
full_name = gt.FullName + "<" + args.ToString () + ">";
}
new_args.Add (new TypeExpression (t, loc));
}
- ctype = new ConstructedType (ctype, new_args, loc).ResolveType (ec);
- if (ctype == null)
+ TypeExpr ct = new ConstructedType (ctype, new_args, loc);
+ if (ct.ResolveAsTypeStep (ec) == null)
return false;
+ ctype = ct.Type;
}
- return Convert.ImplicitStandardConversionExists (expr, ctype);
+ return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
}
protected bool CheckConstraints (EmitContext ec, int index)
Expression aexpr = new EmptyExpression (atype);
- Type parent = ptype.BaseType;
+ 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;
+ is_struct = atype.IsValueType;
+ }
//
// 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;
- }
+ 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}'.",
+ atype, ptype, DeclarationName);
+ 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);
+ return false;
}
//
// The class constraint comes next.
//
- if ((parent != null) && (parent != TypeManager.object_type)) {
- if (!CheckConstraint (ec, ptype, aexpr, parent)) {
+ 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, parent, ptype, DeclarationName);
+ atype, gc.ClassConstraint, ptype, DeclarationName);
return false;
}
}
//
// Now, check the interface constraints.
//
- foreach (Type it in TypeManager.GetInterfaces (ptype)) {
+ foreach (Type it in gc.InterfaceConstraints) {
Type itype;
if (it.IsGenericParameter)
itype = atypes [it.GenericParameterPosition];
// Finally, check the constructor constraint.
//
- if (!TypeManager.HasConstructorConstraint (ptype))
+ if (!gc.HasConstructorConstraint)
return true;
- if (TypeManager.IsBuiltinType (atype))
+ if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
return true;
MethodGroupExpr mg = Expression.MemberLookup (
return true;
}
- public override TypeExpr DoResolveAsTypeStep (EmitContext ec)
+ protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
- 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 ();
+ if (!ResolveConstructedType (ec))
+ return null;
- TypeArguments new_args = new TypeArguments (loc);
- foreach (TypeParameter param in ds.TypeParameters)
- new_args.Add (new TypeParameterExpr (param, loc));
- new_args.Add (args);
+ return this;
+ }
- args = new_args;
- return this;
+ public bool CheckConstraints (EmitContext ec)
+ {
+ for (int i = 0; i < gen_params.Length; i++) {
+ if (!CheckConstraints (ec, i))
+ return false;
}
- Type t;
+ return true;
+ }
+
+ public bool ResolveConstructedType (EmitContext ec)
+ {
+ if (type != null)
+ return true;
+ if (gt != null)
+ return DoResolveType (ec);
+
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;
+ if (t == 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;
"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;
+ return false;
}
//
// Now bind the parameters.
//
type = gt.BindGenericParameters (atypes);
- return type;
+ 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 bool Equals (object obj)
{
ConstructedType cobj = obj as ConstructedType;
return type == cobj.type;
}
- public string Basename {
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
+ }
+
+ public override string Name {
get {
- int pos = name.LastIndexOf ('`');
- if (pos >= 0)
- return name.Substring (0, pos);
- else
- return name;
+ return full_name;
}
}
- public override string Name {
+
+ public override string FullName {
get {
return full_name;
}
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)
{
- if (!Define ())
- return false;
-
GenericTypeParameterBuilder[] gen_params;
string[] names = MemberName.TypeArguments.GetDeclarations ();
gen_params = mb.DefineGenericParameters (names);
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 override MemberCache MemberCache {
get {
- throw new Exception ();
+ return null;
}
}
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);
+ 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);
+ }
+ }
+
+ public partial class TypeManager
+ {
+ //
+ // 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 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");
+ new_constraint_attr_type = CoreLookupType (
+ "System.Runtime.CompilerServices.NewConstraintAttribute");
+
+ 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 name, int arity)
+ {
+ return CoreLookupType (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)
+ {
+ while (t.IsGenericInstance)
+ t = t.GetGenericTypeDefinition ();
+
+ 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 new ReflectionConstraints (t);
+ }
+
+ public static bool IsGeneric (Type t)
+ {
+ DeclSpace ds = (DeclSpace) builder_to_declspace [t];
+
+ return ds.IsGeneric;
+ }
+
+ public static bool HasGenericArguments (Type t)
+ {
+ return GetNumberOfTypeArguments (t) > 0;
+ }
+
+ public static int GetNumberOfTypeArguments (Type t)
+ {
+ DeclSpace tc = LookupDeclSpace (t);
+ if (tc != null)
+ return tc.IsGeneric ? tc.CountTypeParameters : 0;
+ else
+ return t.HasGenericArguments ? 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 ();
+ }
+
+ //
+ // 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 true;
+
+ if ((a is TypeBuilder) && a.IsGenericTypeDefinition && b.IsGenericInstance) {
+ //
+ // `a' is a generic type definition's TypeBuilder and `b' is a
+ // generic instance of the same type.
+ //
+ // Example:
+ //
+ // class Stack<T>
+ // {
+ // void Test (Stack<T> stack) { }
+ // }
+ //
+ // The first argument of `Test' will be the generic instance
+ // "Stack<!0>" - which is the same type than the "Stack" TypeBuilder.
+ //
+ //
+ // We hit this via Closure.Filter() for gen-82.cs.
+ //
+ if (a != b.GetGenericTypeDefinition ())
+ return false;
+
+ Type[] aparams = a.GetGenericArguments ();
+ Type[] bparams = b.GetGenericArguments ();
+
+ if (aparams.Length != bparams.Length)
+ return false;
+
+ for (int i = 0; i < aparams.Length; i++)
+ if (!IsEqual (aparams [i], bparams [i]))
+ return false;
+
+ return true;
+ }
+
+ if ((b is TypeBuilder) && b.IsGenericTypeDefinition && a.IsGenericInstance)
+ return IsEqual (b, a);
+
+ if (a.IsGenericParameter && b.IsGenericParameter) {
+ if ((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.IsGenericInstance && b.IsGenericInstance) {
+ 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;
+ }
+
+ return false;
+ }
+
+ 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.IsGenericInstance) {
+ 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.IsGenericInstance || b.IsGenericInstance)
+ 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.IsGenericInstance || !b.IsGenericInstance)
+ 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;
+ }
+
+ public static bool IsEqualGenericInstance (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;
+
+ return type.Equals (parent);
+ }
+
+ static public 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.IsGenericMethodDefinition;
+ }
+
+ //
+ // Type inference.
+ //
+
+ static bool InferType (Type pt, Type at, Type[] infered)
+ {
+ if (pt.IsGenericParameter && (pt.DeclaringMethod != null)) {
+ 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 ||
+ (at.GetArrayRank () != pt.GetArrayRank ()))
+ return false;
+
+ return InferType (pt.GetElementType (), 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.IsGenericInstance)
+ 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.IsGenericInstance)
+ 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;
+ }
+
+ 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 = method.BindGenericParameters (infered_types);
+ return true;
+ }
+
+ public 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;
+ }
+
+ 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 = method.BindGenericParameters (infered_types);
+ return true;
+ }
+
+ 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 = method.BindGenericParameters (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 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 = type.GetProperty ("HasValue");
+ PropertyInfo value_pi = type.GetProperty ("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;
+
+ if (!(expr is IMemoryLocation))
+ 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);
+ }
+
+ 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)
+ {
+ 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);
+ }
+ }
+
+ 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);
+ 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, loc);
+ }
+ }
+
+ public class LiftedBinaryOperator : Expression
+ {
+ public readonly Binary.Operator Oper;
+
+ 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)
+ {
+ this.Oper = op;
+ this.left = left;
+ this.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.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, loc).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, loc).Resolve (ec);
+ if (underlying == null)
+ return null;
+
+ type = TypeManager.bool_type;
+ is_comparision = true;
+ } else {
+ underlying = new Binary (Oper, left, right, loc).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 ();
+
+ if (left_unwrap != null) {
+ left_unwrap.EmitCheck (ec);
+ if (right is NullLiteral) {
+ if (Oper == Binary.Operator.Equality)
+ ig.Emit (OpCodes.Brfalse, true_label);
+ else
+ 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)
+ ig.Emit (OpCodes.Brfalse, false_label);
+ else
+ ig.Emit (OpCodes.Brfalse, true_label);
+ }
+ }
+
+ if (right_unwrap != null) {
+ right_unwrap.EmitCheck (ec);
+ if (left is NullLiteral) {
+ if (Oper == Binary.Operator.Equality)
+ ig.Emit (OpCodes.Brfalse, true_label);
+ else
+ ig.Emit (OpCodes.Brfalse, false_label);
+ } else {
+ if (Oper == Binary.Operator.Equality)
+ ig.Emit (OpCodes.Brfalse, false_label);
+ else
+ 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)))
+ ig.Emit (OpCodes.Br, true_label);
+ else
+ ig.Emit (OpCodes.Br, false_label);
+ } else {
+ underlying.Emit (ec);
+ ig.Emit (OpCodes.Br, end_label);
+ }
+
+ ig.MarkLabel (false_label);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Br, end_label);
+
+ ig.MarkLabel (true_label);
+ 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);
+ 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