//
// generic.cs: Generics support
//
// Authors: Martin Baulig (martin@ximian.com)
// Miguel de Icaza (miguel@ximian.com)
//
// 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.Reflection.Emit;
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;
}
//
// Returns whether the type parameter is "known to be a reference type".
//
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;
}
}
//
// Returns whether the type parameter is "known to be a value type".
//
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,
ReferenceType,
ValueType
}
//
// Tracks the constraints for a type parameter
//
public class Constraints : GenericConstraints {
string name;
ArrayList constraints;
Location loc;
//
// name is the identifier, constraints is an arraylist of
// Expressions (with types) or `true' for the constructor constraint.
//
public Constraints (string name, ArrayList constraints,
Location loc)
{
this.name = name;
this.constraints = constraints;
this.loc = loc;
}
public string TypeParameter {
get {
return name;
}
}
GenericParameterAttributes attrs;
TypeExpr class_constraint;
ArrayList iface_constraints;
ArrayList type_param_constraints;
int num_constraints, first_constraint;
Type class_constraint_type;
Type[] iface_constraint_types;
Type effective_base_type;
public bool Resolve (EmitContext ec)
{
iface_constraints = new ArrayList ();
type_param_constraints = new ArrayList ();
foreach (object obj in constraints) {
if (HasConstructorConstraint) {
Report.Error (401, loc,
"The new() constraint must be last.");
return false;
}
if (obj is SpecialConstraint) {
SpecialConstraint sc = (SpecialConstraint) obj;
if (sc == SpecialConstraint.Constructor) {
if (!HasValueTypeConstraint) {
attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
continue;
}
Report.Error (
451, loc, "The new () constraint " +
"cannot be used with the `struct' " +
"constraint.");
return false;
}
if ((num_constraints > 0) || HasReferenceTypeConstraint || HasValueTypeConstraint) {
Report.Error (449, loc,
"The `class' or `struct' " +
"constraint must be first");
return false;
}
if (sc == SpecialConstraint.ReferenceType)
attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
else
attrs |= GenericParameterAttributes.ValueTypeConstraint;
continue;
}
TypeExpr expr;
if (obj is ConstructedType) {
ConstructedType cexpr = (ConstructedType) obj;
if (!cexpr.ResolveConstructedType (ec))
return false;
expr = cexpr;
} else
expr = ((Expression) obj).ResolveAsTypeTerminal (ec);
if (expr == 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,
"`{0}': the class constraint for `{1}' " +
"must come before any other constraints.",
expr.Name, name);
return false;
} else if (HasReferenceTypeConstraint || HasValueTypeConstraint) {
Report.Error (450, loc, "`{0}': cannot specify both " +
"a constraint class and the `class' " +
"or `struct' constraint.", expr.Name);
return false;
} else
class_constraint = expr;
num_constraints++;
}
return true;
}
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;
}
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))
return false;
}
ArrayList list = new ArrayList ();
foreach (TypeExpr iface_constraint in iface_constraints) {
foreach (Type type in list) {
if (!type.Equals (iface_constraint.Type))
continue;
Report.Error (405, loc,
"Duplicate constraint `{0}' for type " +
"parameter `{1}'.", iface_constraint.Type,
name);
return false;
}
list.Add (iface_constraint.Type);
}
foreach (TypeParameterExpr expr in type_param_constraints) {
foreach (Type type in list) {
if (!type.Equals (expr.Type))
continue;
Report.Error (405, loc,
"Duplicate constraint `{0}' for type " +
"parameter `{1}'.", expr.Type, name);
return false;
}
list.Add (expr.Type);
}
iface_constraint_types = new Type [list.Count];
list.CopyTo (iface_constraint_types, 0);
if (class_constraint != null) {
class_constraint_type = class_constraint.Type;
if (class_constraint_type == null)
return false;
if (class_constraint_type.IsSealed) {
Report.Error (701, loc,
"`{0}' is not a valid bound. Bounds " +
"must be interfaces or non sealed " +
"classes", class_constraint_type);
return false;
}
if ((class_constraint_type == TypeManager.array_type) ||
(class_constraint_type == TypeManager.delegate_type) ||
(class_constraint_type == TypeManager.enum_type) ||
(class_constraint_type == TypeManager.value_type) ||
(class_constraint_type == TypeManager.object_type)) {
Report.Error (702, loc,
"Bound cannot be special class `{0}'",
class_constraint_type);
return false;
}
}
if (class_constraint_type != null)
effective_base_type = class_constraint_type;
else if (HasValueTypeConstraint)
effective_base_type = TypeManager.value_type;
else
effective_base_type = TypeManager.object_type;
return true;
}
public bool CheckDependencies (EmitContext ec)
{
foreach (TypeParameterExpr expr in type_param_constraints) {
if (!CheckDependencies (expr.TypeParameter, ec))
return false;
}
return true;
}
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, 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, t1, 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;
}
public void Define (GenericTypeParameterBuilder type)
{
type.SetGenericParameterAttributes (attrs);
}
public override GenericParameterAttributes Attributes {
get { return attrs; }
}
public override bool HasClassConstraint {
get { return class_constraint != null; }
}
public override Type ClassConstraint {
get { return class_constraint_type; }
}
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) &&
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;
}
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 : MemberCore, IMemberContainer {
string name;
GenericConstraints gc;
Constraints constraints;
Location loc;
GenericTypeParameterBuilder type;
public TypeParameter (TypeContainer parent, string name,
Constraints constraints, Location loc)
: base (parent, new MemberName (name), null, loc)
{
this.name = name;
this.constraints = constraints;
this.loc = loc;
}
public GenericConstraints GenericConstraints {
get {
return gc != null ? gc : constraints;
}
}
public Constraints Constraints {
get {
return constraints;
}
}
public bool HasConstructorConstraint {
get {
if (constraints != null)
return constraints.HasConstructorConstraint;
return false;
}
}
public Type Type {
get {
return type;
}
}
public bool Resolve (DeclSpace 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;
TypeManager.AddTypeParameter (type, this);
}
public void DefineConstraints ()
{
if (constraints != null)
constraints.Define (type);
}
public bool ResolveType (EmitContext ec)
{
if (constraints != null) {
if (!constraints.ResolveTypes (ec)) {
constraints = null;
return false;
}
}
return true;
}
public bool DefineType (EmitContext ec)
{
return DefineType (ec, null, null, false);
}
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;
}
MethodBase mb = implementing;
if (mb.Mono_IsInflatedMethod)
mb = mb.GetGenericMethodDefinition ();
int pos = type.GenericParameterPosition;
ParameterData pd = TypeManager.GetParameterData (mb);
GenericConstraints temp_gc = pd.GenericConstraints (pos);
Type mparam = mb.GetGenericArguments () [pos];
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 (
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),
mparam, TypeManager.CSharpSignature (mb));
return false;
}
} else {
gc = (GenericConstraints) constraints;
}
if (gc == null)
return true;
if (gc.HasClassConstraint)
type.SetBaseTypeConstraint (gc.ClassConstraint);
type.SetInterfaceConstraints (gc.InterfaceConstraints);
TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
return true;
}
public bool CheckDependencies (EmitContext ec)
{
if (constraints != null)
return constraints.CheckDependencies (ec);
return true;
}
public bool UpdateConstraints (EmitContext ec, Constraints new_constraints, bool check)
{
//
// We're used in partial generic type definitions.
// If `check' is false, we just encountered the first ClassPart which has
// constraints - they become our "real" constraints.
// Otherwise we're called after the type parameters have already been defined
// and check whether the constraints are the same in all parts.
//
if (!check) {
if (type != null)
throw new InvalidOperationException ();
constraints = new_constraints;
return true;
}
if (type == null)
throw new InvalidOperationException ();
if (constraints == null)
return new_constraints == null;
else if (new_constraints == null)
return false;
if (!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
//
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 ();
GenericConstraints gc = (GenericConstraints) constraints;
if (gc.HasClassConstraint) {
MemberList list = TypeManager.FindMembers (
gc.ClassConstraint, mt, bf, filter, criteria);
members.AddRange (list);
}
foreach (Type t in gc.InterfaceConstraints) {
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 + "]";
}
protected class InflatedConstraints : GenericConstraints
{
GenericConstraints gc;
Type base_type;
Type class_constraint;
Type[] iface_constraints;
Type[] dargs;
Type declaring;
public InflatedConstraints (GenericConstraints gc, Type declaring)
{
this.gc = gc;
this.declaring = declaring;
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; }
}
}
}
//
// This type represents a generic type parameter reference.
//
// These expressions are born in a fully resolved state.
//
public class TypeParameterExpr : TypeExpr {
TypeParameter type_parameter;
public override string Name {
get {
return type_parameter.Name;
}
}
public override string FullName {
get {
return type_parameter.Name;
}
}
public TypeParameter TypeParameter {
get {
return type_parameter;
}
}
public TypeParameterExpr (TypeParameter type_parameter, Location loc)
{
this.type_parameter = type_parameter;
this.loc = loc;
}
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");
}
}
public class TypeArguments {
public readonly Location Location;
ArrayList args;
Type[] atypes;
int dimension;
bool has_type_args;
bool created;
public TypeArguments (Location loc)
{
args = new ArrayList ();
this.Location = loc;
}
public TypeArguments (int dimension, Location loc)
{
this.dimension = dimension;
this.Location = loc;
}
public void Add (Expression type)
{
if (created)
throw new InvalidOperationException ();
args.Add (type);
}
public void Add (TypeArguments new_args)
{
if (created)
throw new InvalidOperationException ();
args.AddRange (new_args.args);
}
public string[] GetDeclarations ()
{
string[] ret = new string [args.Count];
for (int i = 0; i < args.Count; i++) {
SimpleName sn = args [i] as SimpleName;
if (sn != null) {
ret [i] = sn.Name;
continue;
}
Report.Error (81, Location, "Type parameter declaration " +
"must be an identifier not a type");
return null;
}
return ret;
}
public Type[] Arguments {
get {
return atypes;
}
}
public bool HasTypeArguments {
get {
return has_type_args;
}
}
public int Count {
get {
if (dimension > 0)
return dimension;
else
return args.Count;
}
}
public bool IsUnbound {
get {
return dimension > 0;
}
}
public override string ToString ()
{
StringBuilder s = new StringBuilder ();
int count = Count;
for (int i = 0; i < count; i++){
//
// FIXME: Use TypeManager.CSharpname once we have the type
//
if (args != null)
s.Append (args [i].ToString ());
if (i+1 < count)
s.Append (",");
}
return s.ToString ();
}
public bool Resolve (EmitContext ec)
{
int count = args.Count;
bool ok = true;
atypes = new Type [count];
for (int i = 0; i < count; i++){
TypeExpr te = ((Expression) args [i]).ResolveAsTypeTerminal (ec);
if (te == null) {
ok = false;
continue;
}
if (te is TypeParameterExpr)
has_type_args = true;
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;
TypeArguments args;
Type[] gen_params, atypes;
Type gt;
public ConstructedType (string name, TypeArguments args, Location l)
{
loc = l;
this.name = MemberName.MakeName (name, args.Count);
this.args = args;
eclass = ExprClass.Type;
full_name = name + "<" + args.ToString () + ">";
}
public ConstructedType (string name, TypeParameter[] type_params, Location l)
: this (type_params, l)
{
loc = l;
this.name = name;
full_name = name + "<" + args.ToString () + ">";
}
public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
{
loc = l;
this.name = fname.FullName;
this.args = args;
eclass = ExprClass.Type;
full_name = name + "<" + args.ToString () + ">";
}
protected ConstructedType (TypeArguments args, Location l)
{
loc = l;
this.args = args;
eclass = ExprClass.Type;
}
protected ConstructedType (TypeParameter[] type_params, Location l)
{
loc = l;
args = new TypeArguments (l);
foreach (TypeParameter type_param in type_params)
args.Add (new TypeParameterExpr (type_param, l));
eclass = ExprClass.Type;
}
public ConstructedType (Type t, TypeParameter[] type_params, Location l)
: this (type_params, l)
{
gt = t.GetGenericTypeDefinition ();
this.name = gt.FullName;
full_name = gt.FullName + "<" + args.ToString () + ">";
}
public ConstructedType (Type t, TypeArguments args, Location l)
: this (args, l)
{
gt = t.GetGenericTypeDefinition ();
this.name = gt.FullName;
full_name = gt.FullName + "<" + args.ToString () + ">";
}
public TypeArguments TypeArguments {
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 ();
}
}
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 = args.Arguments [pos];
}
new_args.Add (new TypeExpression (t, loc));
}
TypeExpr ct = new ConstructedType (ctype, new_args, loc);
if (ct.ResolveAsTypeTerminal (ec) == null)
return false;
ctype = ct.Type;
}
return Convert.ImplicitStandardConversionExists (ec, expr, ctype);
}
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;
is_struct = atype.IsValueType;
}
//
// 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}'.",
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 (gc.HasClassConstraint) {
if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint)) {
Report.Error (309, loc, "The type `{0}' must be " +
"convertible to `{1}' in order to " +
"use it as parameter `{2}' in the " +
"generic type or method `{3}'",
atype, gc.ClassConstraint, ptype, DeclarationName);
return false;
}
}
//
// Now, check the interface constraints.
//
foreach (Type it in gc.InterfaceConstraints) {
Type itype;
if (it.IsGenericParameter)
itype = atypes [it.GenericParameterPosition];
else
itype = it;
if (!CheckConstraint (ec, ptype, aexpr, itype)) {
Report.Error (309, loc, "The type `{0}' must be " +
"convertible to `{1}' in order to " +
"use it as parameter `{2}' in the " +
"generic type or method `{3}'",
atype, itype, ptype, DeclarationName);
return false;
}
}
//
// Finally, check the constructor constraint.
//
if (!gc.HasConstructorConstraint)
return true;
if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
return true;
MethodGroupExpr mg = Expression.MemberLookup (
ec, atype, ".ctor", MemberTypes.Constructor,
BindingFlags.Public | BindingFlags.Instance |
BindingFlags.DeclaredOnly, loc)
as MethodGroupExpr;
if (atype.IsAbstract || (mg == null) || !mg.IsInstance) {
Report.Error (310, loc, "The type `{0}' must have a public " +
"parameterless constructor in order to use it " +
"as parameter `{1}' in the generic type or " +
"method `{2}'", atype, ptype, DeclarationName);
return false;
}
return true;
}
protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
{
if (!ResolveConstructedType (ec))
return null;
return this;
}
public bool CheckConstraints (EmitContext ec)
{
for (int i = 0; i < gen_params.Length; i++) {
if (!CheckConstraints (ec, i))
return false;
}
return true;
}
public override TypeExpr ResolveAsTypeTerminal (EmitContext ec)
{
if (base.ResolveAsTypeTerminal (ec) == null)
return null;
if (!CheckConstraints (ec))
return null;
return this;
}
public bool ResolveConstructedType (EmitContext ec)
{
if (type != null)
return true;
if (gt != null)
return DoResolveType (ec);
//
// 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);
if (ds.IsGeneric) {
foreach (TypeParameter param in ds.TypeParameters)
new_args.Add (new TypeParameterExpr (param, loc));
}
new_args.Add (args);
args = new_args;
return DoResolveType (ec);
}
Type t;
int num_args;
SimpleName sn = new SimpleName (name, loc);
TypeExpr resolved = sn.ResolveAsTypeTerminal (ec);
if (resolved == null)
return false;
t = resolved.Type;
if (t == null) {
Report.Error (246, loc, "Cannot find type `{0}'<...>",
Basename);
return false;
}
num_args = TypeManager.GetNumberOfTypeArguments (t);
if (num_args == 0) {
Report.Error (308, loc,
"The non-generic type `{0}' cannot " +
"be used with type arguments.",
TypeManager.CSharpName (t));
return false;
}
gt = t.GetGenericTypeDefinition ();
return DoResolveType (ec);
}
bool DoResolveType (EmitContext ec)
{
//
// Resolve the arguments.
//
if (args.Resolve (ec) == false)
return false;
gen_params = gt.GetGenericArguments ();
atypes = args.Arguments;
if (atypes.Length != gen_params.Length) {
Report.Error (305, loc,
"Using the generic type `{0}' " +
"requires {1} type arguments",
TypeManager.GetFullName (gt),
gen_params.Length);
return false;
}
//
// Now bind the parameters.
//
type = gt.BindGenericParameters (atypes);
return true;
}
public Expression GetSimpleName (EmitContext ec)
{
return new SimpleName (Basename, args, loc);
}
public override bool CheckAccessLevel (DeclSpace ds)
{
return ds.CheckAccessLevel (gt);
}
public override bool AsAccessible (DeclSpace ds, int flags)
{
return ds.AsAccessible (gt, flags);
}
public override bool IsClass {
get { return gt.IsClass; }
}
public override bool IsValueType {
get { return gt.IsValueType; }
}
public override bool IsInterface {
get { return gt.IsInterface; }
}
public override bool IsSealed {
get { return gt.IsSealed; }
}
public override bool IsAttribute {
get { return false; }
}
public override bool Equals (object obj)
{
ConstructedType cobj = obj as ConstructedType;
if (cobj == null)
return false;
if ((type == null) || (cobj.type == null))
return false;
return type == cobj.type;
}
public override int GetHashCode ()
{
return base.GetHashCode ();
}
public string Basename {
get {
int pos = name.LastIndexOf ('`');
if (pos >= 0)
return name.Substring (0, pos);
else
return name;
}
}
public override string Name {
get {
return full_name;
}
}
public override string FullName {
get {
return full_name;
}
}
}
public class GenericMethod : DeclSpace
{
public GenericMethod (NamespaceEntry ns, TypeContainer parent,
MemberName name, Location l)
: base (ns, parent, name, null, l)
{ }
public override TypeBuilder DefineType ()
{
throw new Exception ();
}
public override bool Define ()
{
for (int i = 0; i < TypeParameters.Length; i++)
if (!TypeParameters [i].Resolve (Parent))
return false;
return true;
}
public bool Define (MethodBuilder mb, Type return_type)
{
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]);
ec = new EmitContext (
this, this, Location, null, return_type, ModFlags, 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,
MethodInfo implementing, bool is_override)
{
for (int i = 0; i < TypeParameters.Length; i++)
if (!TypeParameters [i].DefineType (
ec, mb, implementing, is_override))
return false;
return true;
}
public override bool DefineMembers (TypeContainer parent)
{
return true;
}
public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
MemberFilter filter, object criteria)
{
throw new Exception ();
}
public override MemberCache MemberCache {
get {
return null;
}
}
public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
{
// FIXME
}
protected override void VerifyObsoleteAttribute()
{
// FIXME
}
public override AttributeTargets AttributeTargets {
get {
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)
{
this.expr = expr;
this.loc = loc;
}
public override Expression DoResolve (EmitContext ec)
{
TypeExpr texpr = expr.ResolveAsTypeTerminal (ec);
if (texpr == null)
return null;
type = texpr.Type;
if (type.IsGenericParameter || TypeManager.IsValueType (type))
temp_storage = new LocalTemporary (ec, type);
eclass = ExprClass.Variable;
return this;
}
public override void Emit (EmitContext ec)
{
if (temp_storage != null) {
temp_storage.AddressOf (ec, AddressOp.LoadStore);
ec.ig.Emit (OpCodes.Initobj, type);
temp_storage.Emit (ec);
} else
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;
//
// Tracks the generic parameters.
//
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 bool HasConstructorConstraint (Type t)
{
GenericConstraints gc = GetTypeParameterConstraints (t);
if (gc == null)
return false;
return (gc.Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0;
}
public static GenericConstraints GetTypeParameterConstraints (Type t)
{
if (!t.IsGenericParameter)
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'.
// For instance "string[]" -> "IEnumerable".
//
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
// {
// void Test (Stack stack) { }
// }
//
// The first argument of `Test' will be the generic instance
// "Stack" - 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 : I, I
// class X : I, I
//
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 : I, I>
// -> error because you could instanciate it as
// X,int>
//
// class X : I, I> -> 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);
else {
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))
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 expr, true_expr, false_expr;
Unwrap unwrap;
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);
}
}
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);
}
}
}
}