Nothing,
}
+ /// <remarks>
+ /// This is used to tell Resolve in which types of expressions we're
+ /// interested.
+ /// </remarks>
+ [Flags]
+ public enum ResolveFlags {
+ // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
+ VariableOrValue = 1,
+
+ // Returns a type expression.
+ Type = 2,
+
+ // Returns a method group.
+ MethodGroup = 4,
+
+ // Allows SimpleNames to be returned.
+ // This is used by MemberAccess to construct long names that can not be
+ // partially resolved (namespace-qualified names for example).
+ SimpleName = 8,
+
+ // Mask of all the expression class flags.
+ MaskExprClass = 15,
+
+ // Disable control flow analysis while resolving the expression.
+ // This is used when resolving the instance expression of a field expression.
+ DisableFlowAnalysis = 16
+ }
+
+ //
+ // This is just as a hint to AddressOf of what will be done with the
+ // address.
+ [Flags]
+ public enum AddressOp {
+ Store = 1,
+ Load = 2,
+ LoadStore = 3
+ };
+
/// <summary>
/// This interface is implemented by variables
/// </summary>
public interface IMemoryLocation {
/// <summary>
/// The AddressOf method should generate code that loads
- /// the address of the object and leaves it on the stack
+ /// the address of the object and leaves it on the stack.
+ ///
+ /// The `mode' argument is used to notify the expression
+ /// of whether this will be used to read from the address or
+ /// write to the address.
+ ///
+ /// This is just a hint that can be used to provide good error
+ /// reporting, and should have no other side effects.
+ /// </summary>
+ void AddressOf (EmitContext ec, AddressOp mode);
+ }
+
+ /// <summary>
+ /// This interface is implemented by variables
+ /// </summary>
+ public interface IVariable {
+ /// <summary>
+ /// Checks whether the variable has already been assigned at
+ /// the current position of the method's control flow and
+ /// reports an appropriate error message if not.
+ ///
+ /// If the variable is a struct, then this call checks whether
+ /// all of its fields (including all private ones) have been
+ /// assigned.
+ /// </summary>
+ bool IsAssigned (EmitContext ec, Location loc);
+
+ /// <summary>
+ /// Checks whether field `name' in this struct has been assigned.
+ /// </summary>
+ bool IsFieldAssigned (EmitContext ec, string name, Location loc);
+
+ /// <summary>
+ /// Tells the flow analysis code that the variable has already
+ /// been assigned at the current code position.
+ ///
+ /// If the variable is a struct, this call marks all its fields
+ /// (including private fields) as being assigned.
+ /// </summary>
+ void SetAssigned (EmitContext ec);
+
+ /// <summary>
+ /// Tells the flow analysis code that field `name' in this struct
+ /// has already been assigned atthe current code position.
+ /// </summary>
+ void SetFieldAssigned (EmitContext ec, string name);
+ }
+
+ /// <summary>
+ /// This interface denotes an expression which evaluates to a member
+ /// of a struct or a class.
+ /// </summary>
+ public interface IMemberExpr
+ {
+ /// <summary>
+ /// The name of this member.
+ /// </summary>
+ string Name {
+ get;
+ }
+
+ /// <summary>
+ /// Whether this is an instance member.
+ /// </summary>
+ bool IsInstance {
+ get;
+ }
+
+ /// <summary>
+ /// Whether this is a static member.
+ /// </summary>
+ bool IsStatic {
+ get;
+ }
+
+ /// <summary>
+ /// The type which declares this member.
/// </summary>
- void AddressOf (EmitContext ec);
+ Type DeclaringType {
+ get;
+ }
+
+ /// <summary>
+ /// The instance expression associated with this member, if it's a
+ /// non-static member.
+ /// </summary>
+ Expression InstanceExpression {
+ get; set;
+ }
+ }
+
+ /// <summary>
+ /// Expression which resolves to a type.
+ /// </summary>
+ public interface ITypeExpression
+ {
+ /// <summary>
+ /// Resolve the expression, but only lookup types.
+ /// </summary>
+ Expression DoResolveType (EmitContext ec);
}
/// <remarks>
/// Base class for expressions
/// </remarks>
public abstract class Expression {
- protected ExprClass eclass;
- protected Type type;
+ public ExprClass eclass;
+ protected Type type;
+ protected Location loc;
public Type Type {
get {
}
}
- public ExprClass ExprClass {
+ public Location Location {
get {
- return eclass;
- }
-
- set {
- eclass = value;
+ return loc;
}
}
/// <summary>
/// Utility wrapper routine for Error, just to beautify the code
/// </summary>
- static protected void Error (int error, string s)
+ public void Error (int error, string s)
{
- Report.Error (error, s);
+ if (!Location.IsNull (loc))
+ Report.Error (error, loc, s);
+ else
+ Report.Error (error, s);
}
- static protected void Error (int error, Location loc, string s)
+ /// <summary>
+ /// Utility wrapper routine for Warning, just to beautify the code
+ /// </summary>
+ public void Warning (int warning, string s)
{
- Report.Error (error, loc, s);
+ if (!Location.IsNull (loc))
+ Report.Warning (warning, loc, s);
+ else
+ Report.Warning (warning, s);
}
-
+
/// <summary>
- /// Utility wrapper routine for Warning, just to beautify the code
+ /// Utility wrapper routine for Warning, only prints the warning if
+ /// warnings of level `level' are enabled.
/// </summary>
- static protected void Warning (int warning, string s)
+ public void Warning (int warning, int level, string s)
{
- Report.Warning (warning, s);
+ if (level <= RootContext.WarningLevel)
+ Warning (warning, s);
}
- static public void error30 (Location loc, Type source, Type target)
+ static public void Error_CannotConvertType (Location loc, Type source, Type target)
{
Report.Error (30, loc, "Cannot convert type '" +
TypeManager.CSharpName (source) + "' to '" +
/// Currently Resolve wraps DoResolve to perform sanity
/// checking and assertion checking on what we expect from Resolve.
/// </remarks>
- public Expression Resolve (EmitContext ec)
+ public Expression Resolve (EmitContext ec, ResolveFlags flags)
{
- Expression e = DoResolve (ec);
+ // Are we doing a types-only search ?
+ if ((flags & ResolveFlags.MaskExprClass) == ResolveFlags.Type) {
+ ITypeExpression type_expr = this as ITypeExpression;
- if (e != null){
- if (e is SimpleName){
- SimpleName s = (SimpleName) e;
-
- Report.Error (
- 103, s.Location,
- "The name `" + s.Name + "' could not be found in `" +
- ec.TypeContainer.Name + "'");
+ if (type_expr == null)
+ return null;
+
+ return type_expr.DoResolveType (ec);
+ }
+
+ bool old_do_flow_analysis = ec.DoFlowAnalysis;
+ if ((flags & ResolveFlags.DisableFlowAnalysis) != 0)
+ ec.DoFlowAnalysis = false;
+
+ Expression e;
+ if (this is SimpleName)
+ e = ((SimpleName) this).DoResolveAllowStatic (ec);
+ else
+ e = DoResolve (ec);
+
+ ec.DoFlowAnalysis = old_do_flow_analysis;
+
+ if (e == null)
+ return null;
+
+ if (e is SimpleName){
+ SimpleName s = (SimpleName) e;
+
+ if ((flags & ResolveFlags.SimpleName) == 0) {
+ MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
+ ec.DeclSpace.Name, loc);
return null;
}
-
- if (e.ExprClass == ExprClass.Invalid)
- throw new Exception ("Expression " + e +
- " ExprClass is Invalid after resolve");
- if (e.ExprClass != ExprClass.MethodGroup)
- if (e.type == null)
- throw new Exception ("Expression " + e +
- " did not set its type after Resolve");
+ return s;
}
- return e;
- }
+ if ((e is TypeExpr) || (e is ComposedCast)) {
+ if ((flags & ResolveFlags.Type) == 0) {
+ e.Error118 (flags);
+ return null;
+ }
- /// <summary>
- /// Performs expression resolution and semantic analysis, but
- /// allows SimpleNames to be returned.
- /// </summary>
- ///
- /// <remarks>
- /// This is used by MemberAccess to construct long names that can not be
- /// partially resolved (namespace-qualified names for example).
- /// </remarks>
- public Expression ResolveWithSimpleName (EmitContext ec)
- {
- Expression e = DoResolve (ec);
+ return e;
+ }
- if (e != null){
- if (e is SimpleName)
- return e;
+ switch (e.eclass) {
+ case ExprClass.Type:
+ if ((flags & ResolveFlags.VariableOrValue) == 0) {
+ e.Error118 (flags);
+ return null;
+ }
+ break;
- if (e.ExprClass == ExprClass.Invalid)
- throw new Exception ("Expression " + e +
- " ExprClass is Invalid after resolve");
+ case ExprClass.MethodGroup:
+ if ((flags & ResolveFlags.MethodGroup) == 0) {
+ ((MethodGroupExpr) e).ReportUsageError ();
+ return null;
+ }
+ break;
+
+ case ExprClass.Value:
+ case ExprClass.Variable:
+ case ExprClass.PropertyAccess:
+ case ExprClass.EventAccess:
+ case ExprClass.IndexerAccess:
+ if ((flags & ResolveFlags.VariableOrValue) == 0) {
+ e.Error118 (flags);
+ return null;
+ }
+ break;
- if (e.ExprClass != ExprClass.MethodGroup)
- if (e.type == null)
- throw new Exception ("Expression " + e +
- " did not set its type after Resolve");
+ default:
+ throw new Exception ("Expression " + e.GetType () +
+ " ExprClass is Invalid after resolve");
}
+ if (e.type == null)
+ throw new Exception (
+ "Expression " + e.GetType () +
+ " did not set its type after Resolve\n" +
+ "called from: " + this.GetType ());
+
return e;
}
-
+
+ /// <summary>
+ /// Resolves an expression and performs semantic analysis on it.
+ /// </summary>
+ public Expression Resolve (EmitContext ec)
+ {
+ return Resolve (ec, ResolveFlags.VariableOrValue);
+ }
+
/// <summary>
/// Resolves an expression for LValue assignment
/// </summary>
if (e != null){
if (e is SimpleName){
SimpleName s = (SimpleName) e;
-
- Report.Error (
- 103, s.Location,
- "The name `" + s.Name + "' could not be found in `" +
- ec.TypeContainer.Name + "'");
+ MemberLookupFailed (ec, null, ec.ContainerType, s.Name,
+ ec.DeclSpace.Name, loc);
return null;
}
- if (e.ExprClass == ExprClass.Invalid)
+ if (e.eclass == ExprClass.Invalid)
throw new Exception ("Expression " + e +
" ExprClass is Invalid after resolve");
- if (e.ExprClass != ExprClass.MethodGroup)
- if (e.type == null)
- throw new Exception ("Expression " + e +
- " did not set its type after Resolve");
+ if (e.eclass == ExprClass.MethodGroup) {
+ ((MethodGroupExpr) e).ReportUsageError ();
+ return null;
+ }
+
+ if (e.type == null)
+ throw new Exception ("Expression " + e +
+ " did not set its type after Resolve");
}
return e;
/// </remarks>
public abstract void Emit (EmitContext ec);
- /// <summary>
- /// This method should perform a reduction of the expression. This should
- /// never return null.
- /// </summary>
- public virtual Expression Reduce (EmitContext ec)
- {
- return this;
- }
-
/// <summary>
/// Protected constructor. Only derivate types should
/// be able to be created
/// <summary>
/// Returns a literalized version of a literal FieldInfo
/// </summary>
- public static Expression Literalize (object v, Type t)
+ ///
+ /// <remarks>
+ /// The possible return values are:
+ /// IntConstant, UIntConstant
+ /// LongLiteral, ULongConstant
+ /// FloatConstant, DoubleConstant
+ /// StringConstant
+ ///
+ /// The value returned is already resolved.
+ /// </remarks>
+ public static Constant Constantify (object v, Type t)
{
if (t == TypeManager.int32_type)
- return new IntLiteral ((int) v);
+ return new IntConstant ((int) v);
else if (t == TypeManager.uint32_type)
- return new UIntLiteral ((uint) v);
+ return new UIntConstant ((uint) v);
else if (t == TypeManager.int64_type)
- return new LongLiteral ((long) v);
+ return new LongConstant ((long) v);
else if (t == TypeManager.uint64_type)
- return new ULongLiteral ((ulong) v);
+ return new ULongConstant ((ulong) v);
else if (t == TypeManager.float_type)
- return new FloatLiteral ((float) v);
+ return new FloatConstant ((float) v);
else if (t == TypeManager.double_type)
- return new DoubleLiteral ((double) v);
+ return new DoubleConstant ((double) v);
else if (t == TypeManager.string_type)
- return new StringLiteral ((string) v);
+ return new StringConstant ((string) v);
else if (t == TypeManager.short_type)
- return new IntLiteral ((int) ((short)v));
+ return new ShortConstant ((short)v);
else if (t == TypeManager.ushort_type)
- return new IntLiteral ((int) ((ushort)v));
+ return new UShortConstant ((ushort)v);
else if (t == TypeManager.sbyte_type)
- return new IntLiteral ((int) ((sbyte)v));
+ return new SByteConstant (((sbyte)v));
else if (t == TypeManager.byte_type)
- return new IntLiteral ((int) ((byte)v));
+ return new ByteConstant ((byte)v);
else if (t == TypeManager.char_type)
- return new IntLiteral ((int) ((char)v));
- else
- throw new Exception ("Unknown type for literal (" + t +
+ return new CharConstant ((char)v);
+ else if (t == TypeManager.bool_type)
+ return new BoolConstant ((bool) v);
+ else if (TypeManager.IsEnumType (t)){
+ Constant e = Constantify (v, TypeManager.TypeToCoreType (v.GetType ()));
+
+ return new EnumConstant (e, t);
+ } else
+ throw new Exception ("Unknown type for constant (" + t +
"), details: " + v);
}
/// <summary>
/// Returns a fully formed expression after a MemberLookup
/// </summary>
- static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
+ public static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
{
if (mi is EventInfo)
return new EventExpr ((EventInfo) mi, loc);
else if (mi is FieldInfo)
return new FieldExpr ((FieldInfo) mi, loc);
else if (mi is PropertyInfo)
- return new PropertyExpr ((PropertyInfo) mi, loc);
- else if (mi is Type)
- return new TypeExpr ((Type) mi);
+ return new PropertyExpr (ec, (PropertyInfo) mi, loc);
+ else if (mi is Type){
+ return new TypeExpr ((System.Type) mi, loc);
+ }
return null;
}
//
// FIXME: Probably implement a cache for (t,name,current_access_set)?
//
- // FIXME: We need to cope with access permissions here, or this wont
- // work!
- //
// This code could use some optimizations, but we need to do some
// measurements. For example, we could use a delegate to `flag' when
// something can not any longer be a method-group (because it is something
// This is so we can catch correctly attempts to invoke instance methods
// from a static body (scan for error 120 in ResolveSimpleName).
//
- public static Expression MemberLookup (EmitContext ec, Type t, string name,
- bool same_type, MemberTypes mt,
- BindingFlags bf, Location loc)
+ //
+ // FIXME: Potential optimization, have a static ArrayList
+ //
+
+ public static Expression MemberLookup (EmitContext ec, Type queried_type, string name,
+ MemberTypes mt, BindingFlags bf, Location loc)
{
- if (same_type)
- bf |= BindingFlags.NonPublic;
+ return MemberLookup (ec, ec.ContainerType, null, queried_type, name, mt, bf, loc);
+ }
+
+ //
+ // Lookup type `queried_type' for code in class `container_type' with a qualifier of
+ // `qualifier_type' or null to lookup members in the current class.
+ //
- MemberInfo [] mi = ec.TypeContainer.RootContext.TypeManager.FindMembers (
- t, mt, bf, Type.FilterName, name);
+ public static Expression MemberLookup (EmitContext ec, Type container_type,
+ Type qualifier_type, Type queried_type,
+ string name, MemberTypes mt,
+ BindingFlags bf, Location loc)
+ {
+ MemberInfo [] mi = TypeManager.MemberLookup (container_type, qualifier_type,
+ queried_type, mt, bf, name);
if (mi == null)
return null;
- // Empty array ...
- if (mi.Length == 0)
- return null;
+ int count = mi.Length;
-
- if (mi.Length == 1 && !(mi [0] is MethodBase))
- return Expression.ExprClassFromMemberInfo (ec, mi [0], loc);
-
- for (int i = 0; i < mi.Length; i++)
- if (!(mi [i] is MethodBase)){
- Error (-5, "Do not know how to reproduce this case: " +
- "Methods and non-Method with the same name, " +
- "report this please");
-
- for (i = 0; i < mi.Length; i++){
- Type tt = mi [i].GetType ();
-
- Console.WriteLine (i + ": " + mi [i]);
- while (tt != TypeManager.object_type){
- Console.WriteLine (tt);
- tt = tt.BaseType;
- }
- }
- }
+ if (mi [0] is MethodBase)
+ return new MethodGroupExpr (mi, loc);
+
+ if (count > 1)
+ return null;
- return new MethodGroupExpr (mi);
+ return ExprClassFromMemberInfo (ec, mi [0], loc);
}
public const MemberTypes AllMemberTypes =
MemberTypes.NestedType |
MemberTypes.Property;
- public const BindingFlags AllBindingsFlags =
+ public const BindingFlags AllBindingFlags =
BindingFlags.Public |
BindingFlags.Static |
BindingFlags.Instance;
- public static Expression MemberLookup (EmitContext ec, Type t, string name,
- bool same_type, Location loc)
+ public static Expression MemberLookup (EmitContext ec, Type queried_type,
+ string name, Location loc)
+ {
+ return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
+ AllMemberTypes, AllBindingFlags, loc);
+ }
+
+ public static Expression MemberLookup (EmitContext ec, Type qualifier_type,
+ Type queried_type, string name, Location loc)
+ {
+ return MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
+ name, AllMemberTypes, AllBindingFlags, loc);
+ }
+
+ public static Expression MethodLookup (EmitContext ec, Type queried_type,
+ string name, Location loc)
+ {
+ return MemberLookup (ec, ec.ContainerType, null, queried_type, name,
+ MemberTypes.Method, AllBindingFlags, loc);
+ }
+
+ /// <summary>
+ /// This is a wrapper for MemberLookup that is not used to "probe", but
+ /// to find a final definition. If the final definition is not found, we
+ /// look for private members and display a useful debugging message if we
+ /// find it.
+ /// </summary>
+ public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
+ Type queried_type, string name, Location loc)
+ {
+ return MemberLookupFinal (ec, qualifier_type, queried_type, name,
+ AllMemberTypes, AllBindingFlags, loc);
+ }
+
+ public static Expression MemberLookupFinal (EmitContext ec, Type qualifier_type,
+ Type queried_type, string name,
+ MemberTypes mt, BindingFlags bf,
+ Location loc)
+ {
+ Expression e;
+
+ int errors = Report.Errors;
+
+ e = MemberLookup (ec, ec.ContainerType, qualifier_type, queried_type,
+ name, mt, bf, loc);
+
+ if (e != null)
+ return e;
+
+ // Error has already been reported.
+ if (errors < Report.Errors)
+ return null;
+
+ MemberLookupFailed (ec, qualifier_type, queried_type, name, null, loc);
+ return null;
+ }
+
+ public static void MemberLookupFailed (EmitContext ec, Type qualifier_type,
+ Type queried_type, string name,
+ string class_name, Location loc)
{
- return MemberLookup (ec, t, name, same_type, AllMemberTypes, AllBindingsFlags, loc);
+ object lookup = TypeManager.MemberLookup (queried_type, null, queried_type,
+ AllMemberTypes, AllBindingFlags |
+ BindingFlags.NonPublic, name);
+
+ if (lookup == null) {
+ if (class_name != null)
+ Report.Error (103, loc, "The name `" + name + "' could not be " +
+ "found in `" + class_name + "'");
+ else
+ Report.Error (
+ 117, loc, "`" + queried_type + "' does not contain a " +
+ "definition for `" + name + "'");
+ return;
+ }
+
+ if ((qualifier_type != null) && (qualifier_type != ec.ContainerType) &&
+ ec.ContainerType.IsSubclassOf (qualifier_type)) {
+ // Although a derived class can access protected members of
+ // its base class it cannot do so through an instance of the
+ // base class (CS1540). If the qualifier_type is a parent of the
+ // ec.ContainerType and the lookup succeeds with the latter one,
+ // then we are in this situation.
+
+ lookup = TypeManager.MemberLookup (
+ ec.ContainerType, ec.ContainerType, ec.ContainerType,
+ AllMemberTypes, AllBindingFlags, name);
+
+ if (lookup != null) {
+ Report.Error (
+ 1540, loc, "Cannot access protected member `" +
+ TypeManager.CSharpName (qualifier_type) + "." +
+ name + "' " + "via a qualifier of type `" +
+ TypeManager.CSharpName (qualifier_type) + "'; the " +
+ "qualifier must be of type `" +
+ TypeManager.CSharpName (ec.ContainerType) + "' " +
+ "(or derived from it)");
+ return;
+ }
+ }
+
+ if (qualifier_type != null)
+ Report.Error (
+ 122, loc, "`" + TypeManager.CSharpName (qualifier_type) + "." +
+ name + "' is inaccessible due to its protection level");
+ else
+ Report.Error (
+ 122, loc, "`" + name + "' is inaccessible due to its " +
+ "protection level");
}
+ static public MemberInfo GetFieldFromEvent (EventExpr event_expr)
+ {
+ EventInfo ei = event_expr.EventInfo;
+
+ return TypeManager.GetPrivateFieldOfEvent (ei);
+ }
+
+ static EmptyExpression MyEmptyExpr;
static public Expression ImplicitReferenceConversion (Expression expr, Type target_type)
{
Type expr_type = expr.Type;
- if (target_type == TypeManager.object_type) {
- if (expr_type.IsClass)
- return new EmptyCast (expr, target_type);
+ if (expr_type == null && expr.eclass == ExprClass.MethodGroup){
+ // if we are a method group, emit a warning
+
+ expr.Emit (null);
+ }
+
+ //
+ // notice that it is possible to write "ValueType v = 1", the ValueType here
+ // is an abstract class, and not really a value type, so we apply the same rules.
+ //
+ if (target_type == TypeManager.object_type || target_type == TypeManager.value_type) {
+ //
+ // A pointer type cannot be converted to object
+ //
+ if (expr_type.IsPointer)
+ return null;
+
if (expr_type.IsValueType)
return new BoxedCast (expr);
+ if (expr_type.IsClass || expr_type.IsInterface || expr_type == TypeManager.enum_type)
+ return new EmptyCast (expr, target_type);
} else if (expr_type.IsSubclassOf (target_type)) {
+ //
+ // Special case: enumeration to System.Enum.
+ // System.Enum is not a value type, it is a class, so we need
+ // a boxing conversion
+ //
+ if (expr_type.IsEnum)
+ return new BoxedCast (expr);
+
return new EmptyCast (expr, target_type);
} else {
- // from any class-type S to any interface-type T.
- if (expr_type.IsClass && target_type.IsInterface) {
- if (TypeManager.ImplementsInterface (expr_type, target_type))
- return new EmptyCast (expr, target_type);
- else
- return null;
+ // This code is kind of mirrored inside StandardConversionExists
+ // with the small distinction that we only probe there
+ //
+ // Always ensure that the code here and there is in sync
+
+ // from the null type to any reference-type.
+ if (expr is NullLiteral && !target_type.IsValueType)
+ return new NullLiteralTyped (target_type);
+
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (expr_type, target_type)){
+ if (expr_type.IsClass)
+ return new EmptyCast (expr, target_type);
+ else if (expr_type.IsValueType)
+ return new BoxedCast (expr);
+ }
}
// from any interface type S to interface-type T.
if (expr_type.IsInterface && target_type.IsInterface) {
-
if (TypeManager.ImplementsInterface (expr_type, target_type))
return new EmptyCast (expr, target_type);
else
if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
Type expr_element_type = expr_type.GetElementType ();
+
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression ();
+
+ MyEmptyExpr.SetType (expr_element_type);
Type target_element_type = target_type.GetElementType ();
if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (StandardConversionExists (expr_element_type,
+ if (StandardConversionExists (MyEmptyExpr,
target_element_type))
return new EmptyCast (expr, target_type);
}
return new EmptyCast (expr, target_type);
// from any delegate type to System.Delegate
- if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
+ if ((expr_type == TypeManager.delegate_type ||
+ expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
target_type == TypeManager.delegate_type)
return new EmptyCast (expr, target_type);
// from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
+ if (expr_type.IsArray ||
+ expr_type == TypeManager.delegate_type ||
+ expr_type.IsSubclassOf (TypeManager.delegate_type))
if (target_type == TypeManager.icloneable_type)
return new EmptyCast (expr, target_type);
- // from the null type to any reference-type.
- if (expr is NullLiteral)
- return new EmptyCast (expr, target_type);
-
return null;
}
return null;
}
- /// <summary>
- /// Handles expressions like this: decimal d; d = 1;
- /// and changes them into: decimal d; d = new System.Decimal (1);
- /// </summary>
- static Expression InternalTypeConstructor (EmitContext ec, Expression expr, Type target)
- {
- ArrayList args = new ArrayList ();
-
- args.Add (new Argument (expr, Argument.AType.Expression));
-
- Expression ne = new New (target.FullName, args,
- new Location (-1));
-
- return ne.Resolve (ec);
- }
-
/// <summary>
/// Implicit Numeric Conversions.
///
//
// Attempt to do the implicit constant expression conversions
- if (expr is IntLiteral){
- Expression e;
+ if (expr is Constant){
- e = TryImplicitIntConversion (target_type, (IntLiteral) expr);
-
- if (e != null)
- return e;
- } else if (expr is LongLiteral && target_type == TypeManager.uint64_type){
- //
- // Try the implicit constant expression conversion
- // from long to ulong, instead of a nice routine,
- // we just inline it
- //
- if (((LongLiteral) expr).Value > 0)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
+ if (expr is IntConstant){
+ Expression e;
+
+ e = TryImplicitIntConversion (target_type, (IntConstant) expr);
+
+ if (e != null)
+ return e;
+ } else if (expr is LongConstant && target_type == TypeManager.uint64_type){
+ //
+ // Try the implicit constant expression conversion
+ // from long to ulong, instead of a nice routine,
+ // we just inline it
+ //
+ long v = ((LongConstant) expr).Value;
+ if (v > 0)
+ return new ULongConstant ((ulong) v);
+ }
}
+ Type real_target_type = target_type;
+
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double.
//
- if (target_type == TypeManager.int32_type)
+ if (real_target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.short_type)
+ if (real_target_type == TypeManager.short_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to short, ushort, int, uint, long, ulong, float, double
//
- if ((target_type == TypeManager.short_type) ||
- (target_type == TypeManager.ushort_type) ||
- (target_type == TypeManager.int32_type) ||
- (target_type == TypeManager.uint32_type))
+ if ((real_target_type == TypeManager.short_type) ||
+ (real_target_type == TypeManager.ushort_type) ||
+ (real_target_type == TypeManager.int32_type) ||
+ (real_target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.uint64_type)
+ if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
-
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.short_type){
//
// From short to int, long, float, double
//
- if (target_type == TypeManager.int32_type)
+ if (real_target_type == TypeManager.int32_type)
return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to int, uint, long, ulong, float, double
//
- if (target_type == TypeManager.uint32_type)
+ if (real_target_type == TypeManager.uint32_type)
return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.uint64_type)
+ if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.int32_type)
+ if (real_target_type == TypeManager.int32_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.int32_type){
//
// From int to long, float, double
//
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to long, ulong, float, double
//
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.uint64_type)
+ if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
- } else if ((expr_type == TypeManager.uint64_type) ||
- (expr_type == TypeManager.int64_type)){
+ } else if (expr_type == TypeManager.int64_type){
//
// From long/ulong to float, double
//
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
+ if (real_target_type == TypeManager.float_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
+ } else if (expr_type == TypeManager.uint64_type){
+ //
+ // From ulong to float, double
+ //
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.char_type){
//
// From char to ushort, int, uint, long, ulong, float, double
//
- if ((target_type == TypeManager.ushort_type) ||
- (target_type == TypeManager.int32_type) ||
- (target_type == TypeManager.uint32_type))
+ if ((real_target_type == TypeManager.ushort_type) ||
+ (real_target_type == TypeManager.int32_type) ||
+ (real_target_type == TypeManager.uint32_type))
return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.uint64_type)
+ if (real_target_type == TypeManager.uint64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.int64_type)
+ if (real_target_type == TypeManager.int64_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.float_type)
+ if (real_target_type == TypeManager.float_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
} else if (expr_type == TypeManager.float_type){
//
// float to double
//
- if (target_type == TypeManager.double_type)
+ if (real_target_type == TypeManager.double_type)
return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
}
return null;
}
+ //
+ // Tests whether an implicit reference conversion exists between expr_type
+ // and target_type
+ //
+ public static bool ImplicitReferenceConversionExists (Expression expr, Type target_type)
+ {
+ Type expr_type = expr.Type;
+
+ //
+ // This is the boxed case.
+ //
+ if (target_type == TypeManager.object_type) {
+ if (expr_type.IsClass || expr_type.IsValueType ||
+ expr_type.IsInterface || expr_type == TypeManager.enum_type)
+ return true;
+ } else if (expr_type.IsSubclassOf (target_type)) {
+ return true;
+ } else {
+ // Please remember that all code below actually comes
+ // from ImplicitReferenceConversion so make sure code remains in sync
+
+ // from any class-type S to any interface-type T.
+ if (target_type.IsInterface) {
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return true;
+ }
+
+ // from any interface type S to interface-type T.
+ if (expr_type.IsInterface && target_type.IsInterface)
+ if (TypeManager.ImplementsInterface (expr_type, target_type))
+ return true;
+
+ // from an array-type S to an array-type of type T
+ if (expr_type.IsArray && target_type.IsArray) {
+ if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
+
+ Type expr_element_type = expr_type.GetElementType ();
+
+ if (MyEmptyExpr == null)
+ MyEmptyExpr = new EmptyExpression ();
+
+ MyEmptyExpr.SetType (expr_element_type);
+ Type target_element_type = target_type.GetElementType ();
+
+ if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
+ if (StandardConversionExists (MyEmptyExpr,
+ target_element_type))
+ return true;
+ }
+ }
+
+ // from an array-type to System.Array
+ if (expr_type.IsArray && (target_type == TypeManager.array_type))
+ return true;
+
+ // from any delegate type to System.Delegate
+ if ((expr_type == TypeManager.delegate_type ||
+ expr_type.IsSubclassOf (TypeManager.delegate_type)) &&
+ target_type == TypeManager.delegate_type)
+ if (target_type.IsAssignableFrom (expr_type))
+ return true;
+
+ // from any array-type or delegate type into System.ICloneable.
+ if (expr_type.IsArray ||
+ expr_type == TypeManager.delegate_type ||
+ expr_type.IsSubclassOf (TypeManager.delegate_type))
+ if (target_type == TypeManager.icloneable_type)
+ return true;
+
+ // from the null type to any reference-type.
+ if (expr is NullLiteral && !target_type.IsValueType &&
+ !TypeManager.IsEnumType (target_type))
+ return true;
+
+ }
+
+ return false;
+ }
+
+ /// <summary>
+ /// Same as StandardConversionExists except that it also looks at
+ /// implicit user defined conversions - needed for overload resolution
+ /// </summary>
+ public static bool ImplicitConversionExists (EmitContext ec, Expression expr, Type target_type)
+ {
+ if (StandardConversionExists (expr, target_type) == true)
+ return true;
+
+ Expression dummy = ImplicitUserConversion (ec, expr, target_type, Location.Null);
+
+ if (dummy != null)
+ return true;
+
+ return false;
+ }
+
+ public static bool ImplicitUserConversionExists (EmitContext ec, Type source, Type target)
+ {
+ Expression dummy = ImplicitUserConversion (
+ ec, new EmptyExpression (source), target, Location.Null);
+ return dummy != null;
+ }
+
/// <summary>
/// Determines if a standard implicit conversion exists from
/// expr_type to target_type
/// </summary>
- public static bool StandardConversionExists (Type expr_type, Type target_type)
+ public static bool StandardConversionExists (Expression expr, Type target_type)
{
+ Type expr_type = expr.Type;
+
+ if (expr_type == TypeManager.void_type)
+ return false;
+
if (expr_type == target_type)
return true;
// First numeric conversions
-
+
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to short, int, long, float, double.
return true;
}
- // Next reference conversions
-
- if (target_type == TypeManager.object_type) {
- if ((expr_type.IsClass) ||
- (expr_type.IsValueType))
- return true;
-
- } else if (expr_type.IsSubclassOf (target_type)) {
+ if (ImplicitReferenceConversionExists (expr, target_type))
return true;
-
- } else {
- // from any class-type S to any interface-type T.
- if (expr_type.IsClass && target_type.IsInterface)
- return true;
-
- // from any interface type S to interface-type T.
- // FIXME : Is it right to use IsAssignableFrom ?
- if (expr_type.IsInterface && target_type.IsInterface)
- if (target_type.IsAssignableFrom (expr_type))
+
+ if (expr is IntConstant){
+ int value = ((IntConstant) expr).Value;
+
+ if (target_type == TypeManager.sbyte_type){
+ if (value >= SByte.MinValue && value <= SByte.MaxValue)
return true;
-
- // from an array-type S to an array-type of type T
- if (expr_type.IsArray && target_type.IsArray) {
- if (expr_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
- Type expr_element_type = expr_type.GetElementType ();
- Type target_element_type = target_type.GetElementType ();
-
- if (!expr_element_type.IsValueType && !target_element_type.IsValueType)
- if (StandardConversionExists (expr_element_type,
- target_element_type))
- return true;
- }
- }
-
- // from an array-type to System.Array
- if (expr_type.IsArray && target_type.IsAssignableFrom (expr_type))
- return true;
-
- // from any delegate type to System.Delegate
- if (expr_type.IsSubclassOf (TypeManager.delegate_type) &&
- target_type == TypeManager.delegate_type)
- if (target_type.IsAssignableFrom (expr_type))
+ } else if (target_type == TypeManager.byte_type){
+ if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
return true;
-
- // from any array-type or delegate type into System.ICloneable.
- if (expr_type.IsArray || expr_type.IsSubclassOf (TypeManager.delegate_type))
- if (target_type == TypeManager.icloneable_type)
+ } else if (target_type == TypeManager.short_type){
+ if (value >= Int16.MinValue && value <= Int16.MaxValue)
+ return true;
+ } else if (target_type == TypeManager.ushort_type){
+ if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
return true;
+ } else if (target_type == TypeManager.uint32_type){
+ if (value >= 0)
+ return true;
+ } else if (target_type == TypeManager.uint64_type){
+ //
+ // we can optimize this case: a positive int32
+ // always fits on a uint64. But we need an opcode
+ // to do it.
+ //
+ if (value >= 0)
+ return true;
+ }
- // from the null type to any reference-type.
- // FIXME : How do we do this ?
+ if (value == 0 && expr is IntLiteral && TypeManager.IsEnumType (target_type))
+ return true;
+ }
+
+ if (expr is LongConstant && target_type == TypeManager.uint64_type){
+ //
+ // Try the implicit constant expression conversion
+ // from long to ulong, instead of a nice routine,
+ // we just inline it
+ //
+ long v = ((LongConstant) expr).Value;
+ if (v > 0)
+ return true;
+ }
+
+ if ((target_type == TypeManager.enum_type ||
+ target_type.IsSubclassOf (TypeManager.enum_type)) &&
+ expr is IntLiteral){
+ IntLiteral i = (IntLiteral) expr;
+ if (i.Value == 0)
+ return true;
}
+ if (target_type == TypeManager.void_ptr_type && expr_type.IsPointer)
+ return true;
+
return false;
}
+
+ //
+ // Used internally by FindMostEncompassedType, this is used
+ // to avoid creating lots of objects in the tight loop inside
+ // FindMostEncompassedType
+ //
+ static EmptyExpression priv_fmet_param;
/// <summary>
/// Finds "most encompassed type" according to the spec (13.4.2)
- /// amongst the methods in the MethodGroupExpr which convert from a
- /// type encompassing source_type
+ /// amongst the methods in the MethodGroupExpr
/// </summary>
- static Type FindMostEncompassedType (MethodGroupExpr me, Type source_type)
+ static Type FindMostEncompassedType (ArrayList types)
{
Type best = null;
-
- for (int i = me.Methods.Length; i > 0; ) {
- i--;
- MethodBase mb = me.Methods [i];
- ParameterData pd = Invocation.GetParameterData (mb);
- Type param_type = pd.ParameterType (0);
+ if (priv_fmet_param == null)
+ priv_fmet_param = new EmptyExpression ();
- if (StandardConversionExists (source_type, param_type)) {
- if (best == null)
- best = param_type;
-
- if (StandardConversionExists (param_type, best))
- best = param_type;
+ foreach (Type t in types){
+ priv_fmet_param.SetType (t);
+
+ if (best == null) {
+ best = t;
+ continue;
}
+
+ if (StandardConversionExists (priv_fmet_param, best))
+ best = t;
}
return best;
}
+
+ //
+ // Used internally by FindMostEncompassingType, this is used
+ // to avoid creating lots of objects in the tight loop inside
+ // FindMostEncompassingType
+ //
+ static EmptyExpression priv_fmee_ret;
/// <summary>
/// Finds "most encompassing type" according to the spec (13.4.2)
- /// amongst the methods in the MethodGroupExpr which convert to a
- /// type encompassed by target_type
+ /// amongst the types in the given set
/// </summary>
- static Type FindMostEncompassingType (MethodGroupExpr me, Type target)
+ static Type FindMostEncompassingType (ArrayList types)
{
Type best = null;
-
- for (int i = me.Methods.Length; i > 0; ) {
- i--;
-
- MethodInfo mi = (MethodInfo) me.Methods [i];
- Type ret_type = mi.ReturnType;
-
- if (StandardConversionExists (ret_type, target)) {
- if (best == null)
- best = ret_type;
- if (!StandardConversionExists (ret_type, best))
- best = ret_type;
+ if (priv_fmee_ret == null)
+ priv_fmee_ret = new EmptyExpression ();
+
+ foreach (Type t in types){
+ priv_fmee_ret.SetType (best);
+
+ if (best == null) {
+ best = t;
+ continue;
}
-
+
+ if (StandardConversionExists (priv_fmee_ret, t))
+ best = t;
}
return best;
+ }
+
+ //
+ // Used to avoid creating too many objects
+ //
+ static EmptyExpression priv_fms_expr;
+
+ /// <summary>
+ /// Finds the most specific source Sx according to the rules of the spec (13.4.4)
+ /// by making use of FindMostEncomp* methods. Applies the correct rules separately
+ /// for explicit and implicit conversion operators.
+ /// </summary>
+ static public Type FindMostSpecificSource (MethodGroupExpr me, Expression source,
+ bool apply_explicit_conv_rules,
+ Location loc)
+ {
+ ArrayList src_types_set = new ArrayList ();
+
+ if (priv_fms_expr == null)
+ priv_fms_expr = new EmptyExpression ();
+
+ //
+ // If any operator converts from S then Sx = S
+ //
+ Type source_type = source.Type;
+ foreach (MethodBase mb in me.Methods){
+ ParameterData pd = Invocation.GetParameterData (mb);
+ Type param_type = pd.ParameterType (0);
+
+ if (param_type == source_type)
+ return param_type;
+
+ if (apply_explicit_conv_rules) {
+ //
+ // From the spec :
+ // Find the set of applicable user-defined conversion operators, U. This set
+ // consists of the
+ // user-defined implicit or explicit conversion operators declared by
+ // the classes or structs in D that convert from a type encompassing
+ // or encompassed by S to a type encompassing or encompassed by T
+ //
+ priv_fms_expr.SetType (param_type);
+ if (StandardConversionExists (priv_fms_expr, source_type))
+ src_types_set.Add (param_type);
+ else {
+ if (StandardConversionExists (source, param_type))
+ src_types_set.Add (param_type);
+ }
+ } else {
+ //
+ // Only if S is encompassed by param_type
+ //
+ if (StandardConversionExists (source, param_type))
+ src_types_set.Add (param_type);
+ }
+ }
+
+ //
+ // Explicit Conv rules
+ //
+ if (apply_explicit_conv_rules) {
+ ArrayList candidate_set = new ArrayList ();
+
+ foreach (Type param_type in src_types_set){
+ if (StandardConversionExists (source, param_type))
+ candidate_set.Add (param_type);
+ }
+ if (candidate_set.Count != 0)
+ return FindMostEncompassedType (candidate_set);
+ }
+
+ //
+ // Final case
+ //
+ if (apply_explicit_conv_rules)
+ return FindMostEncompassingType (src_types_set);
+ else
+ return FindMostEncompassedType (src_types_set);
}
+
+ //
+ // Useful in avoiding proliferation of objects
+ //
+ static EmptyExpression priv_fmt_expr;
+ /// <summary>
+ /// Finds the most specific target Tx according to section 13.4.4
+ /// </summary>
+ static public Type FindMostSpecificTarget (MethodGroupExpr me, Type target,
+ bool apply_explicit_conv_rules,
+ Location loc)
+ {
+ ArrayList tgt_types_set = new ArrayList ();
+
+ if (priv_fmt_expr == null)
+ priv_fmt_expr = new EmptyExpression ();
+
+ //
+ // If any operator converts to T then Tx = T
+ //
+ foreach (MethodInfo mi in me.Methods){
+ Type ret_type = mi.ReturnType;
+
+ if (ret_type == target)
+ return ret_type;
+
+ if (apply_explicit_conv_rules) {
+ //
+ // From the spec :
+ // Find the set of applicable user-defined conversion operators, U.
+ //
+ // This set consists of the
+ // user-defined implicit or explicit conversion operators declared by
+ // the classes or structs in D that convert from a type encompassing
+ // or encompassed by S to a type encompassing or encompassed by T
+ //
+ priv_fms_expr.SetType (ret_type);
+ if (StandardConversionExists (priv_fms_expr, target))
+ tgt_types_set.Add (ret_type);
+ else {
+ priv_fms_expr.SetType (target);
+ if (StandardConversionExists (priv_fms_expr, ret_type))
+ tgt_types_set.Add (ret_type);
+ }
+ } else {
+ //
+ // Only if T is encompassed by param_type
+ //
+ priv_fms_expr.SetType (ret_type);
+ if (StandardConversionExists (priv_fms_expr, target))
+ tgt_types_set.Add (ret_type);
+ }
+ }
+
+ //
+ // Explicit conv rules
+ //
+ if (apply_explicit_conv_rules) {
+ ArrayList candidate_set = new ArrayList ();
+
+ foreach (Type ret_type in tgt_types_set){
+ priv_fmt_expr.SetType (ret_type);
+
+ if (StandardConversionExists (priv_fmt_expr, target))
+ candidate_set.Add (ret_type);
+ }
+ if (candidate_set.Count != 0)
+ return FindMostEncompassingType (candidate_set);
+ }
+
+ //
+ // Okay, final case !
+ //
+ if (apply_explicit_conv_rules)
+ return FindMostEncompassedType (tgt_types_set);
+ else
+ return FindMostEncompassingType (tgt_types_set);
+ }
+
/// <summary>
/// User-defined Implicit conversions
/// </summary>
{
return UserDefinedConversion (ec, source, target, loc, true);
}
-
+
/// <summary>
- /// User-defined conversions
+ /// Computes the MethodGroup for the user-defined conversion
+ /// operators from source_type to target_type. `look_for_explicit'
+ /// controls whether we should also include the list of explicit
+ /// operators
/// </summary>
- static public Expression UserDefinedConversion (EmitContext ec, Expression source,
- Type target, Location loc,
- bool look_for_explicit)
+ static MethodGroupExpr GetConversionOperators (EmitContext ec,
+ Type source_type, Type target_type,
+ Location loc, bool look_for_explicit)
{
- Expression mg1 = null, mg2 = null, mg3 = null, mg4 = null;
+ Expression mg1 = null, mg2 = null;
Expression mg5 = null, mg6 = null, mg7 = null, mg8 = null;
- Expression e;
- MethodBase method = null;
- Type source_type = source.Type;
-
string op_name;
-
- // If we have a boolean type, we need to check for the True operator
+ //
// FIXME : How does the False operator come into the picture ?
- // FIXME : This doesn't look complete and very correct !
- if (target == TypeManager.bool_type)
+ // This doesn't look complete and very correct !
+ //
+ if (target_type == TypeManager.bool_type && !look_for_explicit)
op_name = "op_True";
else
op_name = "op_Implicit";
-
- mg1 = MemberLookup (ec, source_type, op_name, false, loc);
- if (source_type.BaseType != null)
- mg2 = MemberLookup (ec, source_type.BaseType, op_name, false, loc);
+ MethodGroupExpr union3;
- mg3 = MemberLookup (ec, target, op_name, false, loc);
+ mg1 = MethodLookup (ec, source_type, op_name, loc);
+ if (source_type.BaseType != null)
+ mg2 = MethodLookup (ec, source_type.BaseType, op_name, loc);
- if (target.BaseType != null)
- mg4 = MemberLookup (ec, target.BaseType, op_name, false, loc);
+ if (mg1 == null)
+ union3 = (MethodGroupExpr) mg2;
+ else if (mg2 == null)
+ union3 = (MethodGroupExpr) mg1;
+ else
+ union3 = Invocation.MakeUnionSet (mg1, mg2, loc);
- MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
- MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
+ mg1 = MethodLookup (ec, target_type, op_name, loc);
+ if (mg1 != null){
+ if (union3 != null)
+ union3 = Invocation.MakeUnionSet (union3, mg1, loc);
+ else
+ union3 = (MethodGroupExpr) mg1;
+ }
- MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
+ if (target_type.BaseType != null)
+ mg1 = MethodLookup (ec, target_type.BaseType, op_name, loc);
+
+ if (mg1 != null){
+ if (union3 != null)
+ union3 = Invocation.MakeUnionSet (union3, mg1, loc);
+ else
+ union3 = (MethodGroupExpr) mg1;
+ }
MethodGroupExpr union4 = null;
if (look_for_explicit) {
-
op_name = "op_Explicit";
-
- mg5 = MemberLookup (ec, source_type, op_name, false, loc);
+ mg5 = MemberLookup (ec, source_type, op_name, loc);
if (source_type.BaseType != null)
- mg6 = MemberLookup (ec, source_type.BaseType, op_name, false, loc);
-
- mg7 = MemberLookup (ec, target, op_name, false, loc);
+ mg6 = MethodLookup (ec, source_type.BaseType, op_name, loc);
- if (target.BaseType != null)
- mg8 = MemberLookup (ec, target.BaseType, op_name, false, loc);
+ mg7 = MemberLookup (ec, target_type, op_name, loc);
+ if (target_type.BaseType != null)
+ mg8 = MethodLookup (ec, target_type.BaseType, op_name, loc);
- MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
- MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
+ MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6, loc);
+ MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8, loc);
- union4 = Invocation.MakeUnionSet (union5, union6);
+ union4 = Invocation.MakeUnionSet (union5, union6, loc);
}
- MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
-
- if (union != null) {
-
- Type most_specific_source, most_specific_target;
+ return Invocation.MakeUnionSet (union3, union4, loc);
+ }
+
+ /// <summary>
+ /// User-defined conversions
+ /// </summary>
+ static public Expression UserDefinedConversion (EmitContext ec, Expression source,
+ Type target, Location loc,
+ bool look_for_explicit)
+ {
+ MethodGroupExpr union;
+ Type source_type = source.Type;
+ MethodBase method = null;
- most_specific_source = FindMostEncompassedType (union, source_type);
- if (most_specific_source == null)
- return null;
+ union = GetConversionOperators (ec, source_type, target, loc, look_for_explicit);
+ if (union == null)
+ return null;
+
+ Type most_specific_source, most_specific_target;
- most_specific_target = FindMostEncompassingType (union, target);
- if (most_specific_target == null)
- return null;
-
- int count = 0;
-
- for (int i = union.Methods.Length; i > 0;) {
- i--;
+#if BLAH
+ foreach (MethodBase m in union.Methods){
+ Console.WriteLine ("Name: " + m.Name);
+ Console.WriteLine (" : " + ((MethodInfo)m).ReturnType);
+ }
+#endif
+
+ most_specific_source = FindMostSpecificSource (union, source, look_for_explicit, loc);
+ if (most_specific_source == null)
+ return null;
- MethodBase mb = union.Methods [i];
- ParameterData pd = Invocation.GetParameterData (mb);
- MethodInfo mi = (MethodInfo) union.Methods [i];
+ most_specific_target = FindMostSpecificTarget (union, target, look_for_explicit, loc);
+ if (most_specific_target == null)
+ return null;
- if (pd.ParameterType (0) == most_specific_source &&
- mi.ReturnType == most_specific_target) {
- method = mb;
- count++;
- }
- }
+ int count = 0;
- if (method == null || count > 1) {
- Report.Error (-11, loc, "Ambiguous user defined conversion");
- return null;
- }
+
+ foreach (MethodBase mb in union.Methods){
+ ParameterData pd = Invocation.GetParameterData (mb);
+ MethodInfo mi = (MethodInfo) mb;
- //
- // This will do the conversion to the best match that we
- // found. Now we need to perform an implict standard conversion
- // if the best match was not the type that we were requested
- // by target.
- //
- if (look_for_explicit)
- source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
- else
- source = ConvertImplicitStandard (ec, source,
- most_specific_source, loc);
+ if (pd.ParameterType (0) == most_specific_source &&
+ mi.ReturnType == most_specific_target) {
+ method = mb;
+ count++;
+ }
+ }
+
+ if (method == null || count > 1)
+ return null;
+
+
+ //
+ // This will do the conversion to the best match that we
+ // found. Now we need to perform an implict standard conversion
+ // if the best match was not the type that we were requested
+ // by target.
+ //
+ if (look_for_explicit)
+ source = ConvertExplicitStandard (ec, source, most_specific_source, loc);
+ else
+ source = ConvertImplicitStandard (ec, source, most_specific_source, loc);
- if (source == null)
- return null;
-
- e = new UserCast ((MethodInfo) method, source);
-
- if (e.Type != target){
- if (!look_for_explicit)
- e = ConvertImplicitStandard (ec, e, target, loc);
- else
- e = ConvertExplicitStandard (ec, e, target, loc);
+ if (source == null)
+ return null;
- return e;
- } else
- return e;
+ Expression e;
+ e = new UserCast ((MethodInfo) method, source, loc);
+ if (e.Type != target){
+ if (!look_for_explicit)
+ e = ConvertImplicitStandard (ec, e, target, loc);
+ else
+ e = ConvertExplicitStandard (ec, e, target, loc);
}
-
- return null;
+
+ return e;
}
/// <summary>
if (target_type == null)
throw new Exception ("Target type is null");
- e = ImplicitNumericConversion (ec, expr, target_type, loc);
- if (e != null)
- return e;
-
- e = ImplicitReferenceConversion (expr, target_type);
+ e = ConvertImplicitStandard (ec, expr, target_type, loc);
if (e != null)
return e;
if (e != null)
return e;
- if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
- IntLiteral i = (IntLiteral) expr;
-
- if (i.Value == 0)
- return new EmptyCast (expr, target_type);
- }
-
return null;
}
e = ImplicitReferenceConversion (expr, target_type);
if (e != null)
return e;
-
- if (target_type.IsSubclassOf (TypeManager.enum_type) && expr is IntLiteral){
+
+ if ((target_type == TypeManager.enum_type ||
+ target_type.IsSubclassOf (TypeManager.enum_type)) &&
+ expr is IntLiteral){
IntLiteral i = (IntLiteral) expr;
if (i.Value == 0)
- return new EmptyCast (expr, target_type);
+ return new EnumConstant ((Constant) expr, target_type);
+ }
+
+ if (ec.InUnsafe) {
+ if (expr_type.IsPointer){
+ if (target_type == TypeManager.void_ptr_type)
+ return new EmptyCast (expr, target_type);
+
+ //
+ // yep, comparing pointer types cant be done with
+ // t1 == t2, we have to compare their element types.
+ //
+ if (target_type.IsPointer){
+ if (target_type.GetElementType() == expr_type.GetElementType())
+ return expr;
+ }
+ }
+
+ if (target_type.IsPointer) {
+ if (expr is NullLiteral)
+ return new EmptyCast (expr, target_type);
+
+ if (expr_type == TypeManager.void_ptr_type)
+ return new EmptyCast (expr, target_type);
+ }
}
+
return null;
}
/// <summary>
- /// Attemps to perform an implict constant conversion of the IntLiteral
+ /// Attemps to perform an implict constant conversion of the IntConstant
/// into a different data type using casts (See Implicit Constant
/// Expression Conversions)
/// </summary>
- static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
+ static protected Expression TryImplicitIntConversion (Type target_type, IntConstant ic)
{
- int value = il.Value;
-
+ int value = ic.Value;
+
if (target_type == TypeManager.sbyte_type){
if (value >= SByte.MinValue && value <= SByte.MaxValue)
- return new EmptyCast (il, target_type);
+ return new SByteConstant ((sbyte) value);
} else if (target_type == TypeManager.byte_type){
if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
- return new EmptyCast (il, target_type);
+ return new ByteConstant ((byte) value);
} else if (target_type == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
- return new EmptyCast (il, target_type);
+ return new ShortConstant ((short) value);
} else if (target_type == TypeManager.ushort_type){
if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
- return new EmptyCast (il, target_type);
+ return new UShortConstant ((ushort) value);
} else if (target_type == TypeManager.uint32_type){
- //
- // we can optimize this case: a positive int32
- // always fits on a uint32
- //
if (value >= 0)
- return new EmptyCast (il, target_type);
+ return new UIntConstant ((uint) value);
} else if (target_type == TypeManager.uint64_type){
//
// we can optimize this case: a positive int32
// to do it.
//
if (value >= 0)
- return new OpcodeCast (il, target_type, OpCodes.Conv_I8);
+ return new ULongConstant ((ulong) value);
+ } else if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) value);
+ else if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) value);
+
+ if (value == 0 && ic is IntLiteral && TypeManager.IsEnumType (target_type)){
+ Type underlying = TypeManager.EnumToUnderlying (target_type);
+ Constant e = (Constant) ic;
+
+ //
+ // Possibly, we need to create a different 0 literal before passing
+ // to EnumConstant
+ //n
+ if (underlying == TypeManager.int64_type)
+ e = new LongLiteral (0);
+ else if (underlying == TypeManager.uint64_type)
+ e = new ULongLiteral (0);
+
+ return new EnumConstant (e, target_type);
}
-
return null;
}
+ static public void Error_CannotConvertImplicit (Location loc, Type source, Type target)
+ {
+ string msg = "Cannot convert implicitly from `"+
+ TypeManager.CSharpName (source) + "' to `" +
+ TypeManager.CSharpName (target) + "'";
+
+ Report.Error (29, loc, msg);
+ }
+
/// <summary>
/// Attemptes to implicityly convert `target' into `type', using
/// ConvertImplicit. If there is no implicit conversion, then
e = ConvertImplicit (ec, source, target_type, loc);
if (e != null)
return e;
-
- string msg = "Cannot convert implicitly from `"+
- TypeManager.CSharpName (source.Type) + "' to `" +
- TypeManager.CSharpName (target_type) + "'";
- Error (29, loc, msg);
+ if (source is DoubleLiteral && target_type == TypeManager.float_type){
+ Report.Error (664, loc,
+ "Double literal cannot be implicitly converted to " +
+ "float type, use F suffix to create a float literal");
+ }
+
+ Error_CannotConvertImplicit (loc, source.Type, target_type);
return null;
}
/// <summary>
/// Performs the explicit numeric conversions
/// </summary>
- static Expression ConvertNumericExplicit (EmitContext ec, Expression expr,
- Type target_type)
+ static Expression ConvertNumericExplicit (EmitContext ec, Expression expr, Type target_type, Location loc)
{
Type expr_type = expr.Type;
+
+ //
+ // If we have an enumeration, extract the underlying type,
+ // use this during the comparison, but wrap around the original
+ // target_type
+ //
+ Type real_target_type = target_type;
+
+ if (TypeManager.IsEnumType (real_target_type))
+ real_target_type = TypeManager.EnumToUnderlying (real_target_type);
+
+ if (StandardConversionExists (expr, real_target_type)){
+ Expression ce = ConvertImplicitStandard (ec, expr, real_target_type, loc);
+
+ if (real_target_type != target_type)
+ return new EmptyCast (ce, target_type);
+ return ce;
+ }
if (expr_type == TypeManager.sbyte_type){
//
// From sbyte to byte, ushort, uint, ulong, char
//
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U1);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U2);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U4);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I1_CH);
} else if (expr_type == TypeManager.byte_type){
//
// From byte to sbyte and char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_I1);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U1_CH);
} else if (expr_type == TypeManager.short_type){
//
// From short to sbyte, byte, ushort, uint, ulong, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U1);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U2);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U4);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I2_CH);
} else if (expr_type == TypeManager.ushort_type){
//
// From ushort to sbyte, byte, short, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_I2);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U2_CH);
} else if (expr_type == TypeManager.int32_type){
//
// From int to sbyte, byte, short, ushort, uint, ulong, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.uint32_type)
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U2);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U4);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I4_CH);
} else if (expr_type == TypeManager.uint32_type){
//
// From uint to sbyte, byte, short, ushort, int, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.int32_type)
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_U2);
+ if (real_target_type == TypeManager.int32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_I4);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U4_CH);
} else if (expr_type == TypeManager.int64_type){
//
// From long to sbyte, byte, short, ushort, int, uint, ulong, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.uint64_type)
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U2);
+ if (real_target_type == TypeManager.int32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_I4);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U4);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.I8_CH);
} else if (expr_type == TypeManager.uint64_type){
//
// From ulong to sbyte, byte, short, ushort, int, uint, long, char
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.int64_type)
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U2);
+ if (real_target_type == TypeManager.int32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I4);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_U4);
+ if (real_target_type == TypeManager.int64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_I8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.U8_CH);
} else if (expr_type == TypeManager.char_type){
//
// From char to sbyte, byte, short
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.CH_I2);
} else if (expr_type == TypeManager.float_type){
//
// From float to sbyte, byte, short,
// ushort, int, uint, long, ulong, char
// or decimal
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U2);
+ if (real_target_type == TypeManager.int32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I4);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U4);
+ if (real_target_type == TypeManager.int64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_I8);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R4_CH);
} else if (expr_type == TypeManager.double_type){
//
// From double to byte, byte, short,
// ushort, int, uint, long, ulong,
// char, float or decimal
//
- if (target_type == TypeManager.sbyte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I1);
- if (target_type == TypeManager.byte_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U1);
- if (target_type == TypeManager.short_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I2);
- if (target_type == TypeManager.ushort_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.uint32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U4);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.char_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U2);
- if (target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (target_type == TypeManager.decimal_type)
- return InternalTypeConstructor (ec, expr, target_type);
+ if (real_target_type == TypeManager.sbyte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I1);
+ if (real_target_type == TypeManager.byte_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U1);
+ if (real_target_type == TypeManager.short_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I2);
+ if (real_target_type == TypeManager.ushort_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U2);
+ if (real_target_type == TypeManager.int32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I4);
+ if (real_target_type == TypeManager.uint32_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U4);
+ if (real_target_type == TypeManager.int64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_I8);
+ if (real_target_type == TypeManager.uint64_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_U8);
+ if (real_target_type == TypeManager.char_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_CH);
+ if (real_target_type == TypeManager.float_type)
+ return new ConvCast (ec, expr, target_type, ConvCast.Mode.R8_R4);
}
// decimal is taken care of by the op_Explicit methods.
/// Returns whether an explicit reference conversion can be performed
/// from source_type to target_type
/// </summary>
- static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
+ public static bool ExplicitReferenceConversionExists (Type source_type, Type target_type)
{
bool target_is_value_type = target_type.IsValueType;
}
//
- // From any class type S to any interface T, provides S is not sealed
+ // From any class type S to any interface T, provided S is not sealed
// and provided S does not implement T.
//
if (target_type.IsInterface && !source_type.IsSealed &&
- !target_type.IsAssignableFrom (source_type))
+ !TypeManager.ImplementsInterface (source_type, target_type))
return true;
//
// sealed, or provided T implements S.
//
if (source_type.IsInterface &&
- (!target_type.IsSealed || source_type.IsAssignableFrom (target_type)))
+ (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type)))
return true;
-
+
+
// From an array type S with an element type Se to an array type T with an
// element type Te provided all the following are true:
// * S and T differe only in element type, in other words, S and T
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
- target_type.IsSubclassOf (TypeManager.array_type)){
+ target_type.IsArray){
return true;
}
{
Type source_type = source.Type;
bool target_is_value_type = target_type.IsValueType;
-
+
//
// From object to any reference type
//
// From any interface type S to any interface T provided S is not derived from T
//
if (source_type.IsInterface && target_type.IsInterface){
-
- Type [] ifaces = source_type.GetInterfaces ();
-
if (TypeManager.ImplementsInterface (source_type, target_type))
return null;
else
// and provided S does not implement T.
//
if (target_type.IsInterface && !source_type.IsSealed) {
-
if (TypeManager.ImplementsInterface (source_type, target_type))
return null;
else
// sealed, or provided T implements S.
//
if (source_type.IsInterface) {
-
- if (target_type.IsSealed)
- return null;
-
- if (TypeManager.ImplementsInterface (target_type, source_type))
+ if (!target_type.IsSealed || TypeManager.ImplementsInterface (target_type, source_type))
return new ClassCast (source, target_type);
else
return null;
// From System.Array to any array-type
if (source_type == TypeManager.array_type &&
- target_type.IsSubclassOf (TypeManager.array_type)){
+ target_type.IsArray) {
return new ClassCast (source, target_type);
}
Type target_type, Location loc)
{
Type expr_type = expr.Type;
+ Type original_expr_type = expr_type;
+
+ if (expr_type.IsSubclassOf (TypeManager.enum_type)){
+ if (target_type == TypeManager.enum_type ||
+ target_type == TypeManager.object_type) {
+ if (expr is EnumConstant)
+ expr = ((EnumConstant) expr).Child;
+ // We really need all these casts here .... :-(
+ expr = new BoxedCast (new EmptyCast (expr, expr_type));
+ return new EmptyCast (expr, target_type);
+ } else if ((expr_type == TypeManager.enum_type) && target_type.IsValueType &&
+ target_type.IsSubclassOf (TypeManager.enum_type))
+ return new UnboxCast (expr, target_type);
+
+ //
+ // Notice that we have kept the expr_type unmodified, which is only
+ // used later on to
+ if (expr is EnumConstant)
+ expr = ((EnumConstant) expr).Child;
+ else
+ expr = new EmptyCast (expr, TypeManager.EnumToUnderlying (expr_type));
+ expr_type = expr.Type;
+ }
+
Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
if (ne != null)
return ne;
- ne = ConvertNumericExplicit (ec, expr, target_type);
+ ne = ConvertNumericExplicit (ec, expr, target_type, loc);
if (ne != null)
return ne;
//
// Unboxing conversion.
//
- if (expr_type == TypeManager.object_type && target_type.IsValueType)
+ if (expr_type == TypeManager.object_type && target_type.IsValueType){
+ if (expr is NullLiteral){
+ Report.Error (37, "Cannot convert null to value type `" + TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
return new UnboxCast (expr, target_type);
-
- //
- // Enum types
- //
- if (expr is EnumLiteral) {
- Expression e = ((EnumLiteral) expr).Child;
-
- return ConvertImplicit (ec, e, target_type, loc);
}
+
ne = ConvertReferenceExplicit (expr, target_type);
if (ne != null)
return ne;
+ if (ec.InUnsafe){
+ if (target_type.IsPointer){
+ if (expr_type.IsPointer)
+ return new EmptyCast (expr, target_type);
+
+ if (expr_type == TypeManager.sbyte_type ||
+ expr_type == TypeManager.byte_type ||
+ expr_type == TypeManager.short_type ||
+ expr_type == TypeManager.ushort_type ||
+ expr_type == TypeManager.int32_type ||
+ expr_type == TypeManager.uint32_type ||
+ expr_type == TypeManager.uint64_type ||
+ expr_type == TypeManager.int64_type)
+ return new OpcodeCast (expr, target_type, OpCodes.Conv_U);
+ }
+ if (expr_type.IsPointer){
+ if (target_type == TypeManager.sbyte_type ||
+ target_type == TypeManager.byte_type ||
+ target_type == TypeManager.short_type ||
+ target_type == TypeManager.ushort_type ||
+ target_type == TypeManager.int32_type ||
+ target_type == TypeManager.uint32_type ||
+ target_type == TypeManager.uint64_type ||
+ target_type == TypeManager.int64_type){
+ Expression e = new EmptyCast (expr, TypeManager.uint32_type);
+ Expression ci, ce;
+
+ ci = ConvertImplicitStandard (ec, e, target_type, loc);
+
+ if (ci != null)
+ return ci;
+
+ ce = ConvertNumericExplicit (ec, e, target_type, loc);
+ if (ce != null)
+ return ce;
+ //
+ // We should always be able to go from an uint32
+ // implicitly or explicitly to the other integral
+ // types
+ //
+ throw new Exception ("Internal compiler error");
+ }
+ }
+ }
+
ne = ExplicitUserConversion (ec, expr, target_type, loc);
if (ne != null)
return ne;
- error30 (loc, expr_type, target_type);
+ Error_CannotConvertType (loc, original_expr_type, target_type);
return null;
}
/// <summary>
- /// Same as ConverExplicit, only it doesn't include user defined conversions
+ /// Same as ConvertExplicit, only it doesn't include user defined conversions
/// </summary>
static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
Type target_type, Location l)
if (ne != null)
return ne;
- ne = ConvertNumericExplicit (ec, expr, target_type);
+ ne = ConvertNumericExplicit (ec, expr, target_type, l);
if (ne != null)
return ne;
if (ne != null)
return ne;
- error30 (l, expr.Type, target_type);
+ Error_CannotConvertType (l, expr.Type, target_type);
return null;
}
/// <summary>
/// Reports that we were expecting `expr' to be of class `expected'
/// </summary>
- protected void report118 (Location loc, Expression expr, string expected)
+ public void Error118 (string expected)
{
string kind = "Unknown";
- if (expr != null)
- kind = ExprClassName (expr.ExprClass);
+ kind = ExprClassName (eclass);
- Error (118, loc, "Expression denotes a `" + kind +
+ Error (118, "Expression denotes a `" + kind +
"' where a `" + expected + "' was expected");
}
- /// <summary>
- /// This function tries to reduce the expression performing
- /// constant folding and common subexpression elimination
- /// </summary>
- static public Expression Reduce (EmitContext ec, Expression e)
+ public void Error118 (ResolveFlags flags)
{
- //Console.WriteLine ("Calling reduce");
- return e.Reduce (ec);
- }
- }
+ ArrayList valid = new ArrayList (10);
- /// <summary>
- /// This is just a base class for expressions that can
- /// appear on statements (invocations, object creation,
- /// assignments, post/pre increment and decrement). The idea
- /// being that they would support an extra Emition interface that
- /// does not leave a result on the stack.
- /// </summary>
- public abstract class ExpressionStatement : Expression {
+ if ((flags & ResolveFlags.VariableOrValue) != 0) {
+ valid.Add ("variable");
+ valid.Add ("value");
+ }
- /// <summary>
- /// Requests the expression to be emitted in a `statement'
- /// context. This means that no new value is left on the
- /// stack after invoking this method (constrasted with
- /// Emit that will always leave a value on the stack).
- /// </summary>
- public abstract void EmitStatement (EmitContext ec);
- }
+ if ((flags & ResolveFlags.Type) != 0)
+ valid.Add ("type");
- /// <summary>
- /// This kind of cast is used to encapsulate the child
- /// whose type is child.Type into an expression that is
- /// reported to return "return_type". This is used to encapsulate
- /// expressions which have compatible types, but need to be dealt
- /// at higher levels with.
- ///
- /// For example, a "byte" expression could be encapsulated in one
- /// of these as an "unsigned int". The type for the expression
- /// would be "unsigned int".
- ///
- /// </summary>
- public class EmptyCast : Expression {
- protected Expression child;
+ if ((flags & ResolveFlags.MethodGroup) != 0)
+ valid.Add ("method group");
- public EmptyCast (Expression child, Type return_type)
- {
- ExprClass = child.ExprClass;
- type = return_type;
- this.child = child;
- }
+ if ((flags & ResolveFlags.SimpleName) != 0)
+ valid.Add ("simple name");
- public override Expression DoResolve (EmitContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
+ if (valid.Count == 0)
+ valid.Add ("unknown");
- return this;
- }
+ StringBuilder sb = new StringBuilder ();
+ for (int i = 0; i < valid.Count; i++) {
+ if (i > 0)
+ sb.Append (", ");
+ else if (i == valid.Count)
+ sb.Append (" or ");
+ sb.Append (valid [i]);
+ }
- public override void Emit (EmitContext ec)
+ string kind = ExprClassName (eclass);
+
+ Error (119, "Expression denotes a `" + kind + "' where " +
+ "a `" + sb.ToString () + "' was expected");
+ }
+
+ static void Error_ConstantValueCannotBeConverted (Location l, string val, Type t)
{
- child.Emit (ec);
+ Report.Error (31, l, "Constant value `" + val + "' cannot be converted to " +
+ TypeManager.CSharpName (t));
}
- }
-
- /// <summary>
- /// This class is used to wrap literals which belong inside Enums
- /// </summary>
- public class EnumLiteral : Literal {
- public Expression Child;
-
- public EnumLiteral (Expression child, Type enum_type)
+ public static void UnsafeError (Location loc)
{
- ExprClass = child.ExprClass;
- this.Child = child;
- type = enum_type;
+ Report.Error (214, loc, "Pointers may only be used in an unsafe context");
}
- public override Expression DoResolve (EmitContext ec)
+ /// <summary>
+ /// Converts the IntConstant, UIntConstant, LongConstant or
+ /// ULongConstant into the integral target_type. Notice
+ /// that we do not return an `Expression' we do return
+ /// a boxed integral type.
+ ///
+ /// FIXME: Since I added the new constants, we need to
+ /// also support conversions from CharConstant, ByteConstant,
+ /// SByteConstant, UShortConstant, ShortConstant
+ ///
+ /// This is used by the switch statement, so the domain
+ /// of work is restricted to the literals above, and the
+ /// targets are int32, uint32, char, byte, sbyte, ushort,
+ /// short, uint64 and int64
+ /// </summary>
+ public static object ConvertIntLiteral (Constant c, Type target_type, Location loc)
{
- // This should never be invoked, we are born in fully
- // initialized state.
+ string s = "";
- return this;
- }
+ if (c.Type == target_type)
+ return ((Constant) c).GetValue ();
- public override void Emit (EmitContext ec)
- {
+ //
+ // Make into one of the literals we handle, we dont really care
+ // about this value as we will just return a few limited types
+ //
+ if (c is EnumConstant)
+ c = ((EnumConstant)c).WidenToCompilerConstant ();
+
+ if (c is IntConstant){
+ int v = ((IntConstant) c).Value;
+
+ if (target_type == TypeManager.uint32_type){
+ if (v >= 0)
+ return (uint) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= Char.MinValue && v <= Char.MaxValue)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v >= SByte.MinValue && v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v >= Int16.MinValue && v <= UInt16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.ushort_type){
+ if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
+ return (ushort) v;
+ } else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type){
+ if (v > 0)
+ return (ulong) v;
+ }
+
+ s = v.ToString ();
+ } else if (c is UIntConstant){
+ uint v = ((UIntConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type){
+ if (v <= Int32.MaxValue)
+ return (int) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= Char.MinValue && v <= Char.MaxValue)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v <= UInt16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.ushort_type){
+ if (v <= UInt16.MaxValue)
+ return (ushort) v;
+ } else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type)
+ return (ulong) v;
+ s = v.ToString ();
+ } else if (c is LongConstant){
+ long v = ((LongConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type){
+ if (v >= UInt32.MinValue && v <= UInt32.MaxValue)
+ return (int) v;
+ } else if (target_type == TypeManager.uint32_type){
+ if (v >= 0 && v <= UInt32.MaxValue)
+ return (uint) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= Char.MinValue && v <= Char.MaxValue)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v >= SByte.MinValue && v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v >= Int16.MinValue && v <= UInt16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.ushort_type){
+ if (v >= UInt16.MinValue && v <= UInt16.MaxValue)
+ return (ushort) v;
+ } else if (target_type == TypeManager.uint64_type){
+ if (v > 0)
+ return (ulong) v;
+ }
+ s = v.ToString ();
+ } else if (c is ULongConstant){
+ ulong v = ((ULongConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type){
+ if (v <= Int32.MaxValue)
+ return (int) v;
+ } else if (target_type == TypeManager.uint32_type){
+ if (v <= UInt32.MaxValue)
+ return (uint) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= Char.MinValue && v <= Char.MaxValue)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v <= (int) SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v <= UInt16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.ushort_type){
+ if (v <= UInt16.MaxValue)
+ return (ushort) v;
+ } else if (target_type == TypeManager.int64_type){
+ if (v <= Int64.MaxValue)
+ return (long) v;
+ }
+ s = v.ToString ();
+ } else if (c is ByteConstant){
+ byte v = ((ByteConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type)
+ return (int) v;
+ else if (target_type == TypeManager.uint32_type)
+ return (uint) v;
+ else if (target_type == TypeManager.char_type)
+ return (char) v;
+ else if (target_type == TypeManager.sbyte_type){
+ if (v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type)
+ return (short) v;
+ else if (target_type == TypeManager.ushort_type)
+ return (ushort) v;
+ else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type)
+ return (ulong) v;
+ s = v.ToString ();
+ } else if (c is SByteConstant){
+ sbyte v = ((SByteConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type)
+ return (int) v;
+ else if (target_type == TypeManager.uint32_type){
+ if (v >= 0)
+ return (uint) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= 0)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= 0)
+ return (byte) v;
+ } else if (target_type == TypeManager.short_type)
+ return (short) v;
+ else if (target_type == TypeManager.ushort_type){
+ if (v >= 0)
+ return (ushort) v;
+ } else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type){
+ if (v >= 0)
+ return (ulong) v;
+ }
+ s = v.ToString ();
+ } else if (c is ShortConstant){
+ short v = ((ShortConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type){
+ return (int) v;
+ } else if (target_type == TypeManager.uint32_type){
+ if (v >= 0)
+ return (uint) v;
+ } else if (target_type == TypeManager.char_type){
+ if (v >= 0)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v >= SByte.MinValue && v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.ushort_type){
+ if (v >= 0)
+ return (ushort) v;
+ } else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type)
+ return (ulong) v;
+
+ s = v.ToString ();
+ } else if (c is UShortConstant){
+ ushort v = ((UShortConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type)
+ return (int) v;
+ else if (target_type == TypeManager.uint32_type)
+ return (uint) v;
+ else if (target_type == TypeManager.char_type){
+ if (v >= Char.MinValue && v <= Char.MaxValue)
+ return (char) v;
+ } else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v <= SByte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v <= Int16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type)
+ return (ulong) v;
+
+ s = v.ToString ();
+ } else if (c is CharConstant){
+ char v = ((CharConstant) c).Value;
+
+ if (target_type == TypeManager.int32_type)
+ return (int) v;
+ else if (target_type == TypeManager.uint32_type)
+ return (uint) v;
+ else if (target_type == TypeManager.byte_type){
+ if (v >= Byte.MinValue && v <= Byte.MaxValue)
+ return (byte) v;
+ } else if (target_type == TypeManager.sbyte_type){
+ if (v <= SByte.MaxValue)
+ return (sbyte) v;
+ } else if (target_type == TypeManager.short_type){
+ if (v <= Int16.MaxValue)
+ return (short) v;
+ } else if (target_type == TypeManager.ushort_type)
+ return (short) v;
+ else if (target_type == TypeManager.int64_type)
+ return (long) v;
+ else if (target_type == TypeManager.uint64_type)
+ return (ulong) v;
+
+ s = v.ToString ();
+ }
+ Error_ConstantValueCannotBeConverted (loc, s, target_type);
+ return null;
+ }
+
+ //
+ // Load the object from the pointer.
+ //
+ public static void LoadFromPtr (ILGenerator ig, Type t)
+ {
+ if (t == TypeManager.int32_type)
+ ig.Emit (OpCodes.Ldind_I4);
+ else if (t == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Ldind_U4);
+ else if (t == TypeManager.short_type)
+ ig.Emit (OpCodes.Ldind_I2);
+ else if (t == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Ldind_U2);
+ else if (t == TypeManager.char_type)
+ ig.Emit (OpCodes.Ldind_U2);
+ else if (t == TypeManager.byte_type)
+ ig.Emit (OpCodes.Ldind_U1);
+ else if (t == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Ldind_I1);
+ else if (t == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Ldind_I8);
+ else if (t == TypeManager.int64_type)
+ ig.Emit (OpCodes.Ldind_I8);
+ else if (t == TypeManager.float_type)
+ ig.Emit (OpCodes.Ldind_R4);
+ else if (t == TypeManager.double_type)
+ ig.Emit (OpCodes.Ldind_R8);
+ else if (t == TypeManager.bool_type)
+ ig.Emit (OpCodes.Ldind_I1);
+ else if (t == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Ldind_I);
+ else if (TypeManager.IsEnumType (t)) {
+ if (t == TypeManager.enum_type)
+ ig.Emit (OpCodes.Ldind_Ref);
+ else
+ LoadFromPtr (ig, TypeManager.EnumToUnderlying (t));
+ } else if (t.IsValueType)
+ ig.Emit (OpCodes.Ldobj, t);
+ else
+ ig.Emit (OpCodes.Ldind_Ref);
+ }
+
+ //
+ // The stack contains the pointer and the value of type `type'
+ //
+ public static void StoreFromPtr (ILGenerator ig, Type type)
+ {
+ if (TypeManager.IsEnumType (type))
+ type = TypeManager.EnumToUnderlying (type);
+ if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Stind_I4);
+ else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Stind_I8);
+ else if (type == TypeManager.char_type || type == TypeManager.short_type ||
+ type == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Stind_I2);
+ else if (type == TypeManager.float_type)
+ ig.Emit (OpCodes.Stind_R4);
+ else if (type == TypeManager.double_type)
+ ig.Emit (OpCodes.Stind_R8);
+ else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
+ type == TypeManager.bool_type)
+ ig.Emit (OpCodes.Stind_I1);
+ else if (type == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Stind_I);
+ else if (type.IsValueType)
+ ig.Emit (OpCodes.Stobj, type);
+ else
+ ig.Emit (OpCodes.Stind_Ref);
+ }
+
+ //
+ // Returns the size of type `t' if known, otherwise, 0
+ //
+ public static int GetTypeSize (Type t)
+ {
+ t = TypeManager.TypeToCoreType (t);
+ if (t == TypeManager.int32_type ||
+ t == TypeManager.uint32_type ||
+ t == TypeManager.float_type)
+ return 4;
+ else if (t == TypeManager.int64_type ||
+ t == TypeManager.uint64_type ||
+ t == TypeManager.double_type)
+ return 8;
+ else if (t == TypeManager.byte_type ||
+ t == TypeManager.sbyte_type ||
+ t == TypeManager.bool_type)
+ return 1;
+ else if (t == TypeManager.short_type ||
+ t == TypeManager.char_type ||
+ t == TypeManager.ushort_type)
+ return 2;
+ else if (t == TypeManager.decimal_type)
+ return 16;
+ else
+ return 0;
+ }
+
+ //
+ // Default implementation of IAssignMethod.CacheTemporaries
+ //
+ public void CacheTemporaries (EmitContext ec)
+ {
+ }
+
+ static void Error_NegativeArrayIndex (Location loc)
+ {
+ Report.Error (284, loc, "Can not create array with a negative size");
+ }
+
+ //
+ // Converts `source' to an int, uint, long or ulong.
+ //
+ public Expression ExpressionToArrayArgument (EmitContext ec, Expression source, Location loc)
+ {
+ Expression target;
+
+ bool old_checked = ec.CheckState;
+ ec.CheckState = true;
+
+ target = ConvertImplicit (ec, source, TypeManager.int32_type, loc);
+ if (target == null){
+ target = ConvertImplicit (ec, source, TypeManager.uint32_type, loc);
+ if (target == null){
+ target = ConvertImplicit (ec, source, TypeManager.int64_type, loc);
+ if (target == null){
+ target = ConvertImplicit (ec, source, TypeManager.uint64_type, loc);
+ if (target == null)
+ Expression.Error_CannotConvertImplicit (loc, source.Type, TypeManager.int32_type);
+ }
+ }
+ }
+ ec.CheckState = old_checked;
+
+ //
+ // Only positive constants are allowed at compile time
+ //
+ if (target is Constant){
+ if (target is IntConstant){
+ if (((IntConstant) target).Value < 0){
+ Error_NegativeArrayIndex (loc);
+ return null;
+ }
+ }
+
+ if (target is LongConstant){
+ if (((LongConstant) target).Value < 0){
+ Error_NegativeArrayIndex (loc);
+ return null;
+ }
+ }
+
+ }
+
+ return target;
+ }
+
+ }
+
+ /// <summary>
+ /// This is just a base class for expressions that can
+ /// appear on statements (invocations, object creation,
+ /// assignments, post/pre increment and decrement). The idea
+ /// being that they would support an extra Emition interface that
+ /// does not leave a result on the stack.
+ /// </summary>
+ public abstract class ExpressionStatement : Expression {
+
+ /// <summary>
+ /// Requests the expression to be emitted in a `statement'
+ /// context. This means that no new value is left on the
+ /// stack after invoking this method (constrasted with
+ /// Emit that will always leave a value on the stack).
+ /// </summary>
+ public abstract void EmitStatement (EmitContext ec);
+ }
+
+ /// <summary>
+ /// This kind of cast is used to encapsulate the child
+ /// whose type is child.Type into an expression that is
+ /// reported to return "return_type". This is used to encapsulate
+ /// expressions which have compatible types, but need to be dealt
+ /// at higher levels with.
+ ///
+ /// For example, a "byte" expression could be encapsulated in one
+ /// of these as an "unsigned int". The type for the expression
+ /// would be "unsigned int".
+ ///
+ /// </summary>
+ public class EmptyCast : Expression {
+ protected Expression child;
+
+ public EmptyCast (Expression child, Type return_type)
+ {
+ eclass = child.eclass;
+ type = return_type;
+ this.child = child;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // This should never be invoked, we are born in fully
+ // initialized state.
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ child.Emit (ec);
+ }
+ }
+
+ /// <summary>
+ /// This class is used to wrap literals which belong inside Enums
+ /// </summary>
+ public class EnumConstant : Constant {
+ public Constant Child;
+
+ public EnumConstant (Constant child, Type enum_type)
+ {
+ eclass = child.eclass;
+ this.Child = child;
+ type = enum_type;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // This should never be invoked, we are born in fully
+ // initialized state.
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
Child.Emit (ec);
}
public override object GetValue ()
{
- return ((Literal) Child).GetValue ();
+ return Child.GetValue ();
}
+ //
+ // Converts from one of the valid underlying types for an enumeration
+ // (int32, uint32, int64, uint64, short, ushort, byte, sbyte) to
+ // one of the internal compiler literals: Int/UInt/Long/ULong Literals.
+ //
+ public Constant WidenToCompilerConstant ()
+ {
+ Type t = TypeManager.EnumToUnderlying (Child.Type);
+ object v = ((Constant) Child).GetValue ();;
+
+ if (t == TypeManager.int32_type)
+ return new IntConstant ((int) v);
+ if (t == TypeManager.uint32_type)
+ return new UIntConstant ((uint) v);
+ if (t == TypeManager.int64_type)
+ return new LongConstant ((long) v);
+ if (t == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) v);
+ if (t == TypeManager.short_type)
+ return new ShortConstant ((short) v);
+ if (t == TypeManager.ushort_type)
+ return new UShortConstant ((ushort) v);
+ if (t == TypeManager.byte_type)
+ return new ByteConstant ((byte) v);
+ if (t == TypeManager.sbyte_type)
+ return new SByteConstant ((sbyte) v);
+
+ throw new Exception ("Invalid enumeration underlying type: " + t);
+ }
+
+ //
+ // Extracts the value in the enumeration on its native representation
+ //
+ public object GetPlainValue ()
+ {
+ Type t = TypeManager.EnumToUnderlying (Child.Type);
+ object v = ((Constant) Child).GetValue ();;
+
+ if (t == TypeManager.int32_type)
+ return (int) v;
+ if (t == TypeManager.uint32_type)
+ return (uint) v;
+ if (t == TypeManager.int64_type)
+ return (long) v;
+ if (t == TypeManager.uint64_type)
+ return (ulong) v;
+ if (t == TypeManager.short_type)
+ return (short) v;
+ if (t == TypeManager.ushort_type)
+ return (ushort) v;
+ if (t == TypeManager.byte_type)
+ return (byte) v;
+ if (t == TypeManager.sbyte_type)
+ return (sbyte) v;
+
+ return null;
+ }
+
public override string AsString ()
{
- return ((Literal) Child).AsString ();
+ return Child.AsString ();
+ }
+
+ public override DoubleConstant ConvertToDouble ()
+ {
+ return Child.ConvertToDouble ();
+ }
+
+ public override FloatConstant ConvertToFloat ()
+ {
+ return Child.ConvertToFloat ();
+ }
+
+ public override ULongConstant ConvertToULong ()
+ {
+ return Child.ConvertToULong ();
+ }
+
+ public override LongConstant ConvertToLong ()
+ {
+ return Child.ConvertToLong ();
+ }
+
+ public override UIntConstant ConvertToUInt ()
+ {
+ return Child.ConvertToUInt ();
+ }
+
+ public override IntConstant ConvertToInt ()
+ {
+ return Child.ConvertToInt ();
}
}
public class BoxedCast : EmptyCast {
public BoxedCast (Expression expr)
- : base (expr, TypeManager.object_type)
+ : base (expr, TypeManager.object_type)
{
}
-
+
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
public override void Emit (EmitContext ec)
{
base.Emit (ec);
+
ec.ig.Emit (OpCodes.Box, child.Type);
}
}
base.Emit (ec);
ig.Emit (OpCodes.Unbox, t);
- //
- // Load the object from the pointer
- //
- if (t == TypeManager.int32_type)
- ig.Emit (OpCodes.Ldind_I4);
- else if (t == TypeManager.uint32_type)
- ig.Emit (OpCodes.Ldind_U4);
- else if (t == TypeManager.short_type)
- ig.Emit (OpCodes.Ldind_I2);
- else if (t == TypeManager.ushort_type)
- ig.Emit (OpCodes.Ldind_U2);
- else if (t == TypeManager.char_type)
- ig.Emit (OpCodes.Ldind_U2);
- else if (t == TypeManager.byte_type)
- ig.Emit (OpCodes.Ldind_U1);
- else if (t == TypeManager.sbyte_type)
- ig.Emit (OpCodes.Ldind_I1);
- else if (t == TypeManager.uint64_type)
- ig.Emit (OpCodes.Ldind_I8);
- else if (t == TypeManager.int64_type)
- ig.Emit (OpCodes.Ldind_I8);
- else if (t == TypeManager.float_type)
- ig.Emit (OpCodes.Ldind_R4);
- else if (t == TypeManager.double_type)
- ig.Emit (OpCodes.Ldind_R8);
- else if (t == TypeManager.bool_type)
- ig.Emit (OpCodes.Ldind_I1);
- else if (t == TypeManager.intptr_type)
- ig.Emit (OpCodes.Ldind_I);
- else
- ig.Emit (OpCodes.Ldobj, t);
+ LoadFromPtr (ig, t);
}
}
/// <summary>
- /// This kind of cast is used to encapsulate a child expression
- /// that can be trivially converted to a target type using one or
- /// two opcodes. The opcodes are passed as arguments.
+ /// This is used to perform explicit numeric conversions.
+ ///
+ /// Explicit numeric conversions might trigger exceptions in a checked
+ /// context, so they should generate the conv.ovf opcodes instead of
+ /// conv opcodes.
/// </summary>
+ public class ConvCast : EmptyCast {
+ public enum Mode : byte {
+ I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
+ U1_I1, U1_CH,
+ I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
+ U2_I1, U2_U1, U2_I2, U2_CH,
+ I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
+ U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
+ I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH,
+ U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH,
+ CH_I1, CH_U1, CH_I2,
+ R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
+ R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4
+ }
+
+ Mode mode;
+ bool checked_state;
+
+ public ConvCast (EmitContext ec, Expression child, Type return_type, Mode m)
+ : base (child, return_type)
+ {
+ checked_state = ec.CheckState;
+ mode = m;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // This should never be invoked, we are born in fully
+ // initialized state.
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ base.Emit (ec);
+
+ if (checked_state){
+ switch (mode){
+ case Mode.I1_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.I1_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.I1_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.I1_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.I1_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+
+ case Mode.U1_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
+ case Mode.U1_CH: /* nothing */ break;
+
+ case Mode.I2_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
+ case Mode.I2_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.I2_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.I2_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.I2_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.I2_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+
+ case Mode.U2_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
+ case Mode.U2_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
+ case Mode.U2_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
+ case Mode.U2_CH: /* nothing */ break;
+
+ case Mode.I4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
+ case Mode.I4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.I4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
+ case Mode.I4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.I4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.I4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.I4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+
+ case Mode.U4_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
+ case Mode.U4_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
+ case Mode.U4_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
+ case Mode.U4_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
+ case Mode.U4_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
+ case Mode.U4_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
+
+ case Mode.I8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
+ case Mode.I8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.I8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
+ case Mode.I8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.I8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
+ case Mode.I8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.I8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.I8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+
+ case Mode.U8_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
+ case Mode.U8_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
+ case Mode.U8_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
+ case Mode.U8_U2: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
+ case Mode.U8_I4: ig.Emit (OpCodes.Conv_Ovf_I4_Un); break;
+ case Mode.U8_U4: ig.Emit (OpCodes.Conv_Ovf_U4_Un); break;
+ case Mode.U8_I8: ig.Emit (OpCodes.Conv_Ovf_I8_Un); break;
+ case Mode.U8_CH: ig.Emit (OpCodes.Conv_Ovf_U2_Un); break;
+
+ case Mode.CH_I1: ig.Emit (OpCodes.Conv_Ovf_I1_Un); break;
+ case Mode.CH_U1: ig.Emit (OpCodes.Conv_Ovf_U1_Un); break;
+ case Mode.CH_I2: ig.Emit (OpCodes.Conv_Ovf_I2_Un); break;
+
+ case Mode.R4_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
+ case Mode.R4_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.R4_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
+ case Mode.R4_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.R4_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
+ case Mode.R4_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.R4_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
+ case Mode.R4_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.R4_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+
+ case Mode.R8_I1: ig.Emit (OpCodes.Conv_Ovf_I1); break;
+ case Mode.R8_U1: ig.Emit (OpCodes.Conv_Ovf_U1); break;
+ case Mode.R8_I2: ig.Emit (OpCodes.Conv_Ovf_I2); break;
+ case Mode.R8_U2: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.R8_I4: ig.Emit (OpCodes.Conv_Ovf_I4); break;
+ case Mode.R8_U4: ig.Emit (OpCodes.Conv_Ovf_U4); break;
+ case Mode.R8_I8: ig.Emit (OpCodes.Conv_Ovf_I8); break;
+ case Mode.R8_U8: ig.Emit (OpCodes.Conv_Ovf_U8); break;
+ case Mode.R8_CH: ig.Emit (OpCodes.Conv_Ovf_U2); break;
+ case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
+ }
+ } else {
+ switch (mode){
+ case Mode.I1_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.I1_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.I1_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.I1_U8: ig.Emit (OpCodes.Conv_I8); break;
+ case Mode.I1_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.U1_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.U1_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.I2_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.I2_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.I2_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.I2_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.I2_U8: ig.Emit (OpCodes.Conv_I8); break;
+ case Mode.I2_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.U2_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.U2_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.U2_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.U2_CH: /* nothing */ break;
+
+ case Mode.I4_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.I4_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.I4_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.I4_U4: /* nothing */ break;
+ case Mode.I4_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.I4_U8: ig.Emit (OpCodes.Conv_I8); break;
+ case Mode.I4_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.U4_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.U4_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.U4_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.U4_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.U4_I4: /* nothing */ break;
+ case Mode.U4_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.I8_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.I8_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.I8_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.I8_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.I8_I4: ig.Emit (OpCodes.Conv_I4); break;
+ case Mode.I8_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.I8_U8: /* nothing */ break;
+ case Mode.I8_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.U8_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.U8_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.U8_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.U8_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.U8_I4: ig.Emit (OpCodes.Conv_I4); break;
+ case Mode.U8_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.U8_I8: /* nothing */ break;
+ case Mode.U8_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.CH_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.CH_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.CH_I2: ig.Emit (OpCodes.Conv_I2); break;
+
+ case Mode.R4_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.R4_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.R4_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.R4_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.R4_I4: ig.Emit (OpCodes.Conv_I4); break;
+ case Mode.R4_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.R4_I8: ig.Emit (OpCodes.Conv_I8); break;
+ case Mode.R4_U8: ig.Emit (OpCodes.Conv_U8); break;
+ case Mode.R4_CH: ig.Emit (OpCodes.Conv_U2); break;
+
+ case Mode.R8_I1: ig.Emit (OpCodes.Conv_I1); break;
+ case Mode.R8_U1: ig.Emit (OpCodes.Conv_U1); break;
+ case Mode.R8_I2: ig.Emit (OpCodes.Conv_I2); break;
+ case Mode.R8_U2: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.R8_I4: ig.Emit (OpCodes.Conv_I4); break;
+ case Mode.R8_U4: ig.Emit (OpCodes.Conv_U4); break;
+ case Mode.R8_I8: ig.Emit (OpCodes.Conv_I8); break;
+ case Mode.R8_U8: ig.Emit (OpCodes.Conv_U8); break;
+ case Mode.R8_CH: ig.Emit (OpCodes.Conv_U2); break;
+ case Mode.R8_R4: ig.Emit (OpCodes.Conv_R4); break;
+ }
+ }
+ }
+ }
+
public class OpcodeCast : EmptyCast {
OpCode op, op2;
bool second_valid;
if (second_valid)
ec.ig.Emit (op2);
}
-
}
/// <summary>
/// The downside of this is that we might be hitting `LookupType' too many
/// times with this scheme.
/// </remarks>
- public class SimpleName : Expression {
+ public class SimpleName : Expression, ITypeExpression {
public readonly string Name;
- public readonly Location Location;
+
+ //
+ // If true, then we are a simple name, not composed with a ".
+ //
+ bool is_base;
+
+ public SimpleName (string a, string b, Location l)
+ {
+ Name = String.Concat (a, ".", b);
+ loc = l;
+ is_base = false;
+ }
public SimpleName (string name, Location l)
{
Name = name;
- Location = l;
+ loc = l;
+ is_base = true;
}
- public static void Error120 (Location l, string name)
+ public static void Error_ObjectRefRequired (EmitContext ec, Location l, string name)
{
- Report.Error (
- 120, l,
- "An object reference is required " +
- "for the non-static field `"+name+"'");
+ if (ec.IsFieldInitializer)
+ Report.Error (
+ 236, l,
+ "A field initializer cannot reference the non-static field, " +
+ "method or property `"+name+"'");
+ else
+ Report.Error (
+ 120, l,
+ "An object reference is required " +
+ "for the non-static field `"+name+"'");
}
//
// Checks whether we are trying to access an instance
// property, method or field from a static body.
//
- Expression MemberStaticCheck (Expression e)
+ Expression MemberStaticCheck (EmitContext ec, Expression e)
{
- if (e is FieldExpr){
- FieldInfo fi = ((FieldExpr) e).FieldInfo;
+ if (e is IMemberExpr){
+ IMemberExpr member = (IMemberExpr) e;
- if (!fi.IsStatic){
- Error120 (Location, Name);
- return null;
- }
- } else if (e is MethodGroupExpr){
- MethodGroupExpr mg = (MethodGroupExpr) e;
-
- if (!mg.RemoveInstanceMethods ()){
- Error120 (Location, mg.Methods [0].Name);
- return null;
- }
- return e;
- } else if (e is PropertyExpr){
- if (!((PropertyExpr) e).IsStatic){
- Error120 (Location, Name);
+ if (!member.IsStatic){
+ Error_ObjectRefRequired (ec, loc, Name);
return null;
}
}
return e;
}
- // <remarks>
- // 7.5.2: Simple Names.
- //
- // Local Variables and Parameters are handled at
- // parse time, so they never occur as SimpleNames.
- // </remarks>
public override Expression DoResolve (EmitContext ec)
{
- Expression e;
+ return SimpleNameResolve (ec, null, false);
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ return SimpleNameResolve (ec, right_side, false);
+ }
+
+
+ public Expression DoResolveAllowStatic (EmitContext ec)
+ {
+ return SimpleNameResolve (ec, null, true);
+ }
+
+ public Expression DoResolveType (EmitContext ec)
+ {
+ DeclSpace ds = ec.DeclSpace;
+ Namespace ns = ds.Namespace;
+ Type t;
+ string alias_value;
//
- // Stage 1: Performed by the parser (binding to local or parameters).
+ // Since we are cheating: we only do the Alias lookup for
+ // namespaces if the name does not include any dots in it
//
+ if (ns != null && is_base)
+ alias_value = ns.LookupAlias (Name);
+ else
+ alias_value = null;
+
+ if (ec.ResolvingTypeTree){
+ if (alias_value != null){
+ if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
+ return new TypeExpr (t, loc);
+ }
+
+ int errors = Report.Errors;
+ Type dt = ec.DeclSpace.FindType (loc, Name);
+ if (Report.Errors != errors)
+ return null;
+
+ if (dt != null)
+ return new TypeExpr (dt, loc);
+ }
//
- // Stage 2: Lookup members
+ // First, the using aliases
//
- e = MemberLookup (ec, ec.TypeContainer.TypeBuilder, Name, true, Location);
- if (e == null){
- //
- // Stage 3: Lookup symbol in the various namespaces.
- //
- Type t;
+ if (alias_value != null){
+ if ((t = RootContext.LookupType (ds, alias_value, true, loc)) != null)
+ return new TypeExpr (t, loc);
- if ((t = ec.TypeContainer.LookupType (Name, true)) != null)
- return new TypeExpr (t);
-
- //
- // Stage 3 part b: Lookup up if we are an alias to a type
- // or a namespace.
- //
- // Since we are cheating: we only do the Alias lookup for
- // namespaces if the name does not include any dots in it
- //
+ // we have alias value, but it isn't Type, so try if it's namespace
+ return new SimpleName (alias_value, loc);
+ }
+
+ //
+ // Stage 2: Lookup up if we are an alias to a type
+ // or a namespace.
+ //
- // IMPLEMENT ME. Read mcs/mcs/TODO for ideas, or rewrite
- // using NamespaceExprs (dunno how that fixes the alias
- // per-file though).
+ if ((t = RootContext.LookupType (ds, Name, true, loc)) != null)
+ return new TypeExpr (t, loc);
- // No match, maybe our parent can compose us
- // into something meaningful.
- //
- return this;
+ // No match, maybe our parent can compose us
+ // into something meaningful.
+ return this;
+ }
+
+ /// <remarks>
+ /// 7.5.2: Simple Names.
+ ///
+ /// Local Variables and Parameters are handled at
+ /// parse time, so they never occur as SimpleNames.
+ ///
+ /// The `allow_static' flag is used by MemberAccess only
+ /// and it is used to inform us that it is ok for us to
+ /// avoid the static check, because MemberAccess might end
+ /// up resolving the Name as a Type name and the access as
+ /// a static type access.
+ ///
+ /// ie: Type Type; .... { Type.GetType (""); }
+ ///
+ /// Type is both an instance variable and a Type; Type.GetType
+ /// is the static method not an instance method of type.
+ /// </remarks>
+ Expression SimpleNameResolve (EmitContext ec, Expression right_side, bool allow_static)
+ {
+ Expression e = null;
+
+ //
+ // Stage 1: Performed by the parser (binding to locals or parameters).
+ //
+ Block current_block = ec.CurrentBlock;
+ if (current_block != null && current_block.GetVariableInfo (Name) != null){
+ LocalVariableReference var;
+
+ var = new LocalVariableReference (ec.CurrentBlock, Name, loc);
+
+ if (right_side != null)
+ return var.ResolveLValue (ec, right_side);
+ else
+ return var.Resolve (ec);
+ }
+
+ if (current_block != null){
+ int idx = -1;
+ Parameter par = null;
+ Parameters pars = current_block.Parameters;
+ if (pars != null)
+ par = pars.GetParameterByName (Name, out idx);
+
+ if (par != null) {
+ ParameterReference param;
+
+ param = new ParameterReference (pars, idx, Name, loc);
+
+ if (right_side != null)
+ return param.ResolveLValue (ec, right_side);
+ else
+ return param.Resolve (ec);
+ }
}
- // Step 2, continues here.
+ //
+ // Stage 2: Lookup members
+ //
+
+ DeclSpace lookup_ds = ec.DeclSpace;
+ do {
+ if (lookup_ds.TypeBuilder == null)
+ break;
+
+ e = MemberLookup (ec, lookup_ds.TypeBuilder, Name, loc);
+ if (e != null)
+ break;
+
+ lookup_ds =lookup_ds.Parent;
+ } while (lookup_ds != null);
+
+ if (e == null && ec.ContainerType != null)
+ e = MemberLookup (ec, ec.ContainerType, Name, loc);
+
+ if (e == null)
+ return DoResolveType (ec);
+
if (e is TypeExpr)
return e;
- if (e is FieldExpr){
- FieldExpr fe = (FieldExpr) e;
-
- if (!fe.FieldInfo.IsStatic)
- fe.InstanceExpression = new This (Location.Null);
- }
+ if (e is IMemberExpr) {
+ e = MemberAccess.ResolveMemberAccess (ec, e, null, loc, this);
+ if (e == null)
+ return null;
- if (ec.IsStatic)
- return MemberStaticCheck (e);
- else
+ IMemberExpr me = e as IMemberExpr;
+ if (me == null)
+ return e;
+
+ // This fails if ResolveMemberAccess() was unable to decide whether
+ // it's a field or a type of the same name.
+ if (!me.IsStatic && (me.InstanceExpression == null))
+ return e;
+
+ if (!me.IsStatic &&
+ TypeManager.IsNestedChildOf (me.InstanceExpression.Type, me.DeclaringType)) {
+ Error (38, "Cannot access nonstatic member `" + me.Name + "' of " +
+ "outer type `" + me.DeclaringType + "' via nested type `" +
+ me.InstanceExpression.Type + "'");
+ return null;
+ }
+
+ if (right_side != null)
+ e = e.DoResolveLValue (ec, right_side);
+ else
+ e = e.DoResolve (ec);
+
+ return e;
+ }
+
+ if (ec.IsStatic || ec.IsFieldInitializer){
+ if (allow_static)
+ return e;
+
+ return MemberStaticCheck (ec, e);
+ } else
return e;
}
-
+
public override void Emit (EmitContext ec)
{
//
// find the name as a namespace
//
- Error (103, Location, "The name `" + Name +
+ Error (103, "The name `" + Name +
"' does not exist in the class `" +
- ec.TypeContainer.Name + "'");
+ ec.DeclSpace.Name + "'");
+ }
+
+ public override string ToString ()
+ {
+ return Name;
}
}
/// <summary>
/// Fully resolved expression that evaluates to a type
/// </summary>
- public class TypeExpr : Expression {
- public TypeExpr (Type t)
+ public class TypeExpr : Expression, ITypeExpression {
+ public TypeExpr (Type t, Location l)
{
Type = t;
eclass = ExprClass.Type;
+ loc = l;
+ }
+
+ public virtual Expression DoResolveType (EmitContext ec)
+ {
+ return this;
}
override public Expression DoResolve (EmitContext ec)
override public void Emit (EmitContext ec)
{
- throw new Exception ("Implement me");
+ throw new Exception ("Should never be called");
+ }
+
+ public override string ToString ()
+ {
+ return Type.ToString ();
+ }
+ }
+
+ /// <summary>
+ /// Used to create types from a fully qualified name. These are just used
+ /// by the parser to setup the core types. A TypeLookupExpression is always
+ /// classified as a type.
+ /// </summary>
+ public class TypeLookupExpression : TypeExpr {
+ string name;
+
+ public TypeLookupExpression (string name) : base (null, Location.Null)
+ {
+ this.name = name;
+ }
+
+ public override Expression DoResolveType (EmitContext ec)
+ {
+ if (type == null)
+ type = RootContext.LookupType (ec.DeclSpace, name, false, Location.Null);
+ return this;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return DoResolveType (ec);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should never be called");
+ }
+
+ public override string ToString ()
+ {
+ return name;
}
}
///
/// This is a fully resolved expression that evaluates to a type
/// </summary>
- public class MethodGroupExpr : Expression {
+ public class MethodGroupExpr : Expression, IMemberExpr {
public MethodBase [] Methods;
Expression instance_expression = null;
+ bool is_explicit_impl = false;
- public MethodGroupExpr (MemberInfo [] mi)
+ public MethodGroupExpr (MemberInfo [] mi, Location l)
{
Methods = new MethodBase [mi.Length];
mi.CopyTo (Methods, 0);
eclass = ExprClass.MethodGroup;
+ type = TypeManager.object_type;
+ loc = l;
}
- public MethodGroupExpr (ArrayList l)
+ public MethodGroupExpr (ArrayList list, Location l)
{
- Methods = new MethodBase [l.Count];
-
- l.CopyTo (Methods, 0);
+ Methods = new MethodBase [list.Count];
+
+ try {
+ list.CopyTo (Methods, 0);
+ } catch {
+ foreach (MemberInfo m in list){
+ if (!(m is MethodBase)){
+ Console.WriteLine ("Name " + m.Name);
+ Console.WriteLine ("Found a: " + m.GetType ().FullName);
+ }
+ }
+ throw;
+ }
+ loc = l;
eclass = ExprClass.MethodGroup;
+ type = TypeManager.object_type;
+ }
+
+ public Type DeclaringType {
+ get {
+ return Methods [0].DeclaringType;
+ }
}
//
return instance_expression;
}
- set {
- instance_expression = value;
+ set {
+ instance_expression = value;
+ }
+ }
+
+ public bool IsExplicitImpl {
+ get {
+ return is_explicit_impl;
+ }
+
+ set {
+ is_explicit_impl = value;
+ }
+ }
+
+ public string Name {
+ get {
+ return Methods [0].Name;
+ }
+ }
+
+ public bool IsInstance {
+ get {
+ foreach (MethodBase mb in Methods)
+ if (!mb.IsStatic)
+ return true;
+
+ return false;
+ }
+ }
+
+ public bool IsStatic {
+ get {
+ foreach (MethodBase mb in Methods)
+ if (mb.IsStatic)
+ return true;
+
+ return false;
}
}
override public Expression DoResolve (EmitContext ec)
{
+ if (instance_expression != null) {
+ instance_expression = instance_expression.DoResolve (ec);
+ if (instance_expression == null)
+ return null;
+ }
+
return this;
}
+ public void ReportUsageError ()
+ {
+ Report.Error (654, loc, "Method `" + Methods [0].DeclaringType + "." +
+ Methods [0].Name + "()' is referenced without parentheses");
+ }
+
override public void Emit (EmitContext ec)
{
- throw new Exception ("This should never be reached");
+ ReportUsageError ();
}
bool RemoveMethods (bool keep_static)
{
ArrayList smethods = new ArrayList ();
- int top = Methods.Length;
- int i;
-
- for (i = 0; i < top; i++){
- MethodBase mb = Methods [i];
+ foreach (MethodBase mb in Methods){
if (mb.IsStatic == keep_static)
smethods.Add (mb);
}
/// <summary>
/// Fully resolved expression that evaluates to a Field
/// </summary>
- public class FieldExpr : Expression, IAssignMethod, IMemoryLocation {
+ public class FieldExpr : Expression, IAssignMethod, IMemoryLocation, IMemberExpr {
public readonly FieldInfo FieldInfo;
- public Expression InstanceExpression;
- Location loc;
+ Expression instance_expr;
public FieldExpr (FieldInfo fi, Location l)
{
loc = l;
}
+ public string Name {
+ get {
+ return FieldInfo.Name;
+ }
+ }
+
+ public bool IsInstance {
+ get {
+ return !FieldInfo.IsStatic;
+ }
+ }
+
+ public bool IsStatic {
+ get {
+ return FieldInfo.IsStatic;
+ }
+ }
+
+ public Type DeclaringType {
+ get {
+ return FieldInfo.DeclaringType;
+ }
+ }
+
+ public Expression InstanceExpression {
+ get {
+ return instance_expr;
+ }
+
+ set {
+ instance_expr = value;
+ }
+ }
+
override public Expression DoResolve (EmitContext ec)
{
if (!FieldInfo.IsStatic){
- if (InstanceExpression == null){
- throw new Exception ("non-static FieldExpr without instance var\n" +
- "You have to assign the Instance variable\n" +
- "Of the FieldExpr to set this\n");
+ if (instance_expr == null){
+ //
+ // This can happen when referencing an instance field using
+ // a fully qualified type expression: TypeName.InstanceField = xxx
+ //
+ SimpleName.Error_ObjectRefRequired (ec, loc, FieldInfo.Name);
+ return null;
}
- InstanceExpression = InstanceExpression.Resolve (ec);
- if (InstanceExpression == null)
+ // Resolve the field's instance expression while flow analysis is turned
+ // off: when accessing a field "a.b", we must check whether the field
+ // "a.b" is initialized, not whether the whole struct "a" is initialized.
+ instance_expr = instance_expr.Resolve (ec, ResolveFlags.VariableOrValue |
+ ResolveFlags.DisableFlowAnalysis);
+ if (instance_expr == null)
return null;
-
}
+
+ // If the instance expression is a local variable or parameter.
+ IVariable var = instance_expr as IVariable;
+ if ((var != null) && !var.IsFieldAssigned (ec, FieldInfo.Name, loc))
+ return null;
+
return this;
}
- public Expression DoResolveLValue (EmitContext ec)
+ void Report_AssignToReadonly (bool is_instance)
+ {
+ string msg;
+
+ if (is_instance)
+ msg = "Readonly field can not be assigned outside " +
+ "of constructor or variable initializer";
+ else
+ msg = "A static readonly field can only be assigned in " +
+ "a static constructor";
+
+ Report.Error (is_instance ? 191 : 198, loc, msg);
+ }
+
+ override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
+ IVariable var = instance_expr as IVariable;
+ if (var != null)
+ var.SetFieldAssigned (ec, FieldInfo.Name);
+
+ Expression e = DoResolve (ec);
+
+ if (e == null)
+ return null;
+
if (!FieldInfo.IsInitOnly)
return this;
// InitOnly fields can only be assigned in constructors
//
- if (ec.IsConstructor)
- return this;
+ if (ec.IsConstructor){
+ if (ec.ContainerType == FieldInfo.DeclaringType)
+ return this;
+ }
- Report.Error (191, loc,
- "Readonly field can not be assigned outside " +
- "of constructor or variable initializer");
+ Report_AssignToReadonly (true);
return null;
}
override public void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
+ bool is_volatile = false;
- if (FieldInfo.IsStatic)
+ if (FieldInfo is FieldBuilder){
+ FieldBase f = TypeManager.GetField (FieldInfo);
+
+ if ((f.ModFlags & Modifiers.VOLATILE) != 0)
+ is_volatile = true;
+
+ f.status |= Field.Status.USED;
+ }
+
+ if (FieldInfo.IsStatic){
+ if (is_volatile)
+ ig.Emit (OpCodes.Volatile);
+
ig.Emit (OpCodes.Ldsfld, FieldInfo);
- else {
- InstanceExpression.Emit (ec);
+ } else {
+ if (instance_expr.Type.IsValueType){
+ IMemoryLocation ml;
+ LocalTemporary tempo = null;
+
+ if (!(instance_expr is IMemoryLocation)){
+ tempo = new LocalTemporary (
+ ec, instance_expr.Type);
+
+ InstanceExpression.Emit (ec);
+ tempo.Store (ec);
+ ml = tempo;
+ } else
+ ml = (IMemoryLocation) instance_expr;
+
+ ml.AddressOf (ec, AddressOp.Load);
+ } else
+ instance_expr.Emit (ec);
+
+ if (is_volatile)
+ ig.Emit (OpCodes.Volatile);
ig.Emit (OpCodes.Ldfld, FieldInfo);
}
public void EmitAssign (EmitContext ec, Expression source)
{
- bool is_static = FieldInfo.IsStatic;
+ FieldAttributes fa = FieldInfo.Attributes;
+ bool is_static = (fa & FieldAttributes.Static) != 0;
+ bool is_readonly = (fa & FieldAttributes.InitOnly) != 0;
+ ILGenerator ig = ec.ig;
- if (!is_static)
- InstanceExpression.Emit (ec);
+ if (is_readonly && !ec.IsConstructor){
+ Report_AssignToReadonly (!is_static);
+ return;
+ }
+
+ if (!is_static){
+ Expression instance = instance_expr;
+
+ if (instance.Type.IsValueType){
+ if (instance is IMemoryLocation){
+ IMemoryLocation ml = (IMemoryLocation) instance;
+
+ ml.AddressOf (ec, AddressOp.Store);
+ } else
+ throw new Exception ("The " + instance + " of type " +
+ instance.Type +
+ " represents a ValueType and does " +
+ "not implement IMemoryLocation");
+ } else
+ instance.Emit (ec);
+ }
source.Emit (ec);
+
+ if (FieldInfo is FieldBuilder){
+ FieldBase f = TypeManager.GetField (FieldInfo);
+
+ if ((f.ModFlags & Modifiers.VOLATILE) != 0)
+ ig.Emit (OpCodes.Volatile);
+ }
if (is_static)
- ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
- else
- ec.ig.Emit (OpCodes.Stfld, FieldInfo);
-
+ ig.Emit (OpCodes.Stsfld, FieldInfo);
+ else
+ ig.Emit (OpCodes.Stfld, FieldInfo);
+
+ if (FieldInfo is FieldBuilder){
+ FieldBase f = TypeManager.GetField (FieldInfo);
+
+ f.status |= Field.Status.ASSIGNED;
+ }
}
- public void AddressOf (EmitContext ec)
+ public void AddressOf (EmitContext ec, AddressOp mode)
{
+ ILGenerator ig = ec.ig;
+
+ if (FieldInfo is FieldBuilder){
+ FieldBase f = TypeManager.GetField (FieldInfo);
+ if ((f.ModFlags & Modifiers.VOLATILE) != 0)
+ ig.Emit (OpCodes.Volatile);
+ }
+
+ if (FieldInfo is FieldBuilder){
+ FieldBase f = TypeManager.GetField (FieldInfo);
+
+ if ((mode & AddressOp.Store) != 0)
+ f.status |= Field.Status.ASSIGNED;
+ if ((mode & AddressOp.Load) != 0)
+ f.status |= Field.Status.USED;
+ }
+
+ //
+ // Handle initonly fields specially: make a copy and then
+ // get the address of the copy.
+ //
+ if (FieldInfo.IsInitOnly && !ec.IsConstructor){
+ LocalBuilder local;
+
+ Emit (ec);
+ local = ig.DeclareLocal (type);
+ ig.Emit (OpCodes.Stloc, local);
+ ig.Emit (OpCodes.Ldloca, local);
+ return;
+ }
+
if (FieldInfo.IsStatic)
- ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
+ ig.Emit (OpCodes.Ldsflda, FieldInfo);
else {
- InstanceExpression.Emit (ec);
- ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
+ //
+ // In the case of `This', we call the AddressOf method, which will
+ // only load the pointer, and not perform an Ldobj immediately after
+ // the value has been loaded into the stack.
+ //
+ if (instance_expr is This)
+ ((This)instance_expr).AddressOf (ec, AddressOp.LoadStore);
+ else
+ instance_expr.Emit (ec);
+ ig.Emit (OpCodes.Ldflda, FieldInfo);
}
}
}
/// This is not an LValue because we need to re-write the expression, we
/// can not take data from the stack and store it.
/// </summary>
- public class PropertyExpr : ExpressionStatement, IAssignMethod {
+ public class PropertyExpr : ExpressionStatement, IAssignMethod, IMemberExpr {
public readonly PropertyInfo PropertyInfo;
- public readonly bool IsStatic;
- MethodInfo [] Accessors;
- Location loc;
+
+ //
+ // This is set externally by the `BaseAccess' class
+ //
+ public bool IsBase;
+ MethodInfo getter, setter;
+ bool is_static;
+ bool must_do_cs1540_check;
Expression instance_expr;
-
- public PropertyExpr (PropertyInfo pi, Location l)
+
+ public PropertyExpr (EmitContext ec, PropertyInfo pi, Location l)
{
PropertyInfo = pi;
eclass = ExprClass.PropertyAccess;
- IsStatic = false;
+ is_static = false;
loc = l;
- Accessors = TypeManager.GetAccessors (pi);
- if (Accessors != null)
- for (int i = 0; i < Accessors.Length; i++){
- if (Accessors [i] != null)
- if (Accessors [i].IsStatic)
- IsStatic = true;
- }
- else
- Accessors = new MethodInfo [2];
-
- type = pi.PropertyType;
+ type = TypeManager.TypeToCoreType (pi.PropertyType);
+
+ ResolveAccessors (ec);
+ }
+
+ public string Name {
+ get {
+ return PropertyInfo.Name;
+ }
+ }
+
+ public bool IsInstance {
+ get {
+ return !is_static;
+ }
+ }
+
+ public bool IsStatic {
+ get {
+ return is_static;
+ }
+ }
+
+ public Type DeclaringType {
+ get {
+ return PropertyInfo.DeclaringType;
+ }
}
//
public bool VerifyAssignable ()
{
- if (!PropertyInfo.CanWrite){
+ if (setter == null) {
Report.Error (200, loc,
"The property `" + PropertyInfo.Name +
"' can not be assigned to, as it has not set accessor");
return true;
}
+ MethodInfo GetAccessor (Type invocation_type, string accessor_name)
+ {
+ BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic |
+ BindingFlags.Static | BindingFlags.Instance;
+ MemberInfo[] group;
+
+ group = TypeManager.MemberLookup (
+ invocation_type, invocation_type, PropertyInfo.DeclaringType,
+ MemberTypes.Method, flags, accessor_name + "_" + PropertyInfo.Name);
+
+ //
+ // The first method is the closest to us
+ //
+ if (group == null)
+ return null;
+
+ foreach (MethodInfo mi in group) {
+ MethodAttributes ma = mi.Attributes & MethodAttributes.MemberAccessMask;
+
+ //
+ // If only accessible to the current class or children
+ //
+ if (ma == MethodAttributes.Private) {
+ Type declaring_type = mi.DeclaringType;
+
+ if (invocation_type != declaring_type){
+ if (TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
+ return mi;
+ else
+ continue;
+ } else
+ return mi;
+ }
+ //
+ // FamAndAssem requires that we not only derivate, but we are on the
+ // same assembly.
+ //
+ if (ma == MethodAttributes.FamANDAssem){
+ if (mi.DeclaringType.Assembly != invocation_type.Assembly)
+ continue;
+ else
+ return mi;
+ }
+
+ // Assembly and FamORAssem succeed if we're in the same assembly.
+ if ((ma == MethodAttributes.Assembly) || (ma == MethodAttributes.FamORAssem)){
+ if (mi.DeclaringType.Assembly != invocation_type.Assembly)
+ continue;
+ else
+ return mi;
+ }
+
+ // We already know that we aren't in the same assembly.
+ if (ma == MethodAttributes.Assembly)
+ continue;
+
+ // Family and FamANDAssem require that we derive.
+ if ((ma == MethodAttributes.Family) || (ma == MethodAttributes.FamANDAssem)){
+ if (!TypeManager.IsSubclassOrNestedChildOf (invocation_type, mi.DeclaringType))
+ continue;
+ else {
+ must_do_cs1540_check = true;
+
+ return mi;
+ }
+ }
+
+ return mi;
+ }
+
+ return null;
+ }
+
+ //
+ // We also perform the permission checking here, as the PropertyInfo does not
+ // hold the information for the accessibility of its setter/getter
+ //
+ void ResolveAccessors (EmitContext ec)
+ {
+ getter = GetAccessor (ec.ContainerType, "get");
+ if ((getter != null) && getter.IsStatic)
+ is_static = true;
+
+ setter = GetAccessor (ec.ContainerType, "set");
+ if ((setter != null) && setter.IsStatic)
+ is_static = true;
+
+ if (setter == null && getter == null){
+ Error (122, "`" + PropertyInfo.Name + "' " +
+ "is inaccessible because of its protection level");
+
+ }
+ }
+
+ bool InstanceResolve (EmitContext ec)
+ {
+ if ((instance_expr == null) && ec.IsStatic && !is_static) {
+ SimpleName.Error_ObjectRefRequired (ec, loc, PropertyInfo.Name);
+ return false;
+ }
+
+ if (instance_expr != null) {
+ instance_expr = instance_expr.DoResolve (ec);
+ if (instance_expr == null)
+ return false;
+ }
+
+ if (must_do_cs1540_check && (instance_expr != null)) {
+ if ((instance_expr.Type != ec.ContainerType) &&
+ ec.ContainerType.IsSubclassOf (instance_expr.Type)) {
+ Report.Error (1540, loc, "Cannot access protected member `" +
+ PropertyInfo.DeclaringType + "." + PropertyInfo.Name +
+ "' via a qualifier of type `" +
+ TypeManager.CSharpName (instance_expr.Type) +
+ "'; the qualifier must be of type `" +
+ TypeManager.CSharpName (ec.ContainerType) +
+ "' (or derived from it)");
+ return false;
+ }
+ }
+
+ return true;
+ }
+
override public Expression DoResolve (EmitContext ec)
{
- if (!PropertyInfo.CanRead){
+ if (getter == null){
+ //
+ // The following condition happens if the PropertyExpr was
+ // created, but is invalid (ie, the property is inaccessible),
+ // and we did not want to embed the knowledge about this in
+ // the caller routine. This only avoids double error reporting.
+ //
+ if (setter == null)
+ return null;
+
Report.Error (154, loc,
"The property `" + PropertyInfo.Name +
"' can not be used in " +
"this context because it lacks a get accessor");
return null;
+ }
+
+ if (!InstanceResolve (ec))
+ return null;
+
+ //
+ // Only base will allow this invocation to happen.
+ //
+ if (IsBase && getter.IsAbstract){
+ Report.Error (205, loc, "Cannot call an abstract base property: " +
+ PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
+ return null;
+ }
+
+ return this;
+ }
+
+ override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (setter == null){
+ //
+ // The following condition happens if the PropertyExpr was
+ // created, but is invalid (ie, the property is inaccessible),
+ // and we did not want to embed the knowledge about this in
+ // the caller routine. This only avoids double error reporting.
+ //
+ if (getter == null)
+ return null;
+
+ Report.Error (154, loc,
+ "The property `" + PropertyInfo.Name +
+ "' can not be used in " +
+ "this context because it lacks a set accessor");
+ return null;
}
+ if (!InstanceResolve (ec))
+ return null;
+
+ //
+ // Only base will allow this invocation to happen.
+ //
+ if (IsBase && setter.IsAbstract){
+ Report.Error (205, loc, "Cannot call an abstract base property: " +
+ PropertyInfo.DeclaringType + "." +PropertyInfo.Name);
+ return null;
+ }
return this;
}
override public void Emit (EmitContext ec)
{
- Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [0], null);
+ //
+ // Special case: length of single dimension array property is turned into ldlen
+ //
+ if ((getter == TypeManager.system_int_array_get_length) ||
+ (getter == TypeManager.int_array_get_length)){
+ Type iet = instance_expr.Type;
+
+ //
+ // System.Array.Length can be called, but the Type does not
+ // support invoking GetArrayRank, so test for that case first
+ //
+ if (iet != TypeManager.array_type && (iet.GetArrayRank () == 1)){
+ instance_expr.Emit (ec);
+ ec.ig.Emit (OpCodes.Ldlen);
+ return;
+ }
+ }
+
+ Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, getter, null, loc);
}
ArrayList args = new ArrayList ();
args.Add (arg);
- Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [1], args);
+ Invocation.EmitCall (ec, IsBase, IsStatic, instance_expr, setter, args, loc);
}
override public void EmitStatement (EmitContext ec)
}
/// <summary>
- /// Fully resolved expression that evaluates to a Expression
+ /// Fully resolved expression that evaluates to an Event
/// </summary>
- public class EventExpr : Expression {
+ public class EventExpr : Expression, IMemberExpr {
public readonly EventInfo EventInfo;
- Location loc;
+ public Expression instance_expr;
+
+ bool is_static;
+ MethodInfo add_accessor, remove_accessor;
public EventExpr (EventInfo ei, Location loc)
{
EventInfo = ei;
this.loc = loc;
eclass = ExprClass.EventAccess;
+
+ add_accessor = TypeManager.GetAddMethod (ei);
+ remove_accessor = TypeManager.GetRemoveMethod (ei);
+
+ if (add_accessor.IsStatic || remove_accessor.IsStatic)
+ is_static = true;
+
+ if (EventInfo is MyEventBuilder){
+ MyEventBuilder eb = (MyEventBuilder) EventInfo;
+ type = eb.EventType;
+ eb.SetUsed ();
+ } else
+ type = EventInfo.EventHandlerType;
}
- override public Expression DoResolve (EmitContext ec)
+ public string Name {
+ get {
+ return EventInfo.Name;
+ }
+ }
+
+ public bool IsInstance {
+ get {
+ return !is_static;
+ }
+ }
+
+ public bool IsStatic {
+ get {
+ return is_static;
+ }
+ }
+
+ public Type DeclaringType {
+ get {
+ return EventInfo.DeclaringType;
+ }
+ }
+
+ public Expression InstanceExpression {
+ get {
+ return instance_expr;
+ }
+
+ set {
+ instance_expr = value;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
{
- // We are born in resolved state.
+ if (instance_expr != null) {
+ instance_expr = instance_expr.DoResolve (ec);
+ if (instance_expr == null)
+ return null;
+ }
+
+
return this;
}
- override public void Emit (EmitContext ec)
+ public override void Emit (EmitContext ec)
+ {
+ Report.Error (70, loc, "The event `" + Name + "' can only appear on the left hand side of += or -= (except on the defining type)");
+ }
+
+ public void EmitAddOrRemove (EmitContext ec, Expression source)
{
- throw new Exception ("Implement me");
- // FIXME: Implement.
+ Expression handler = ((Binary) source).Right;
+
+ Argument arg = new Argument (handler, Argument.AType.Expression);
+ ArrayList args = new ArrayList ();
+
+ args.Add (arg);
+
+ if (((Binary) source).Oper == Binary.Operator.Addition)
+ Invocation.EmitCall (
+ ec, false, IsStatic, instance_expr, add_accessor, args, loc);
+ else
+ Invocation.EmitCall (
+ ec, false, IsStatic, instance_expr, remove_accessor, args, loc);
}
}
-
}
projects / mono.git / blobdiff