// (C) 2001 Ximian, Inc.
//
//
-// Ideas:
-// Maybe we should make Resolve be an instance method that just calls
-// the virtual DoResolve function and checks conditions like the eclass
-// and type being set if a non-null value is returned. For robustness
-// purposes.
-//
-
-namespace CIR {
- using System;
- using System.Collections;
- using System.Diagnostics;
- using System.Reflection;
- using System.Reflection.Emit;
- using System.Text;
-
- // <remarks>
- // The ExprClass class contains the is used to pass the
- // classification of an expression (value, variable, namespace,
- // type, method group, property access, event access, indexer access,
- // nothing).
- // </remarks>
- public enum ExprClass {
- Invalid,
-
- Value,
- Variable,
- Namespace,
- Type,
- MethodGroup,
- PropertyAccess,
- EventAccess,
- IndexerAccess,
- Nothing,
- }
-
- // <summary>
- // An interface provided by expressions that can be used as
- // LValues and can store the value on the top of the stack on
- // their storage
- // </summary>
- public interface IStackStore {
-
- // <summary>
- // The Store method should store the contents of the top
- // of the stack into the storage that is implemented by
- // the particular implementation of LValue
- // </summary>
- void Store (EmitContext ec);
- }
-
- // <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
- // </summary>
- void AddressOf (EmitContext ec);
- }
-
- // <remarks>
- // Base class for expressions
- // </remarks>
- public abstract class Expression {
- protected ExprClass eclass;
- protected Type type;
-
- public Type Type {
- get {
- return type;
- }
-
- set {
- type = value;
- }
- }
-
- public ExprClass ExprClass {
- get {
- return eclass;
- }
-
- set {
- eclass = value;
- }
- }
-
- // <summary>
- // Utility wrapper routine for Error, just to beautify the code
- // </summary>
- static protected void Error (int error, string s)
- {
- Report.Error (error, s);
- }
-
- static protected void Error (int error, Location loc, string s)
- {
- Report.Error (error, loc, s);
- }
-
- // <summary>
- // Utility wrapper routine for Warning, just to beautify the code
- // </summary>
- static protected void Warning (int warning, string s)
- {
- Report.Warning (warning, s);
- }
-
- // <summary>
- // Performs semantic analysis on the Expression
- // </summary>
- //
- // <remarks>
- // The Resolve method is invoked to perform the semantic analysis
- // on the node.
- //
- // The return value is an expression (it can be the
- // same expression in some cases) or a new
- // expression that better represents this node.
- //
- // For example, optimizations of Unary (LiteralInt)
- // would return a new LiteralInt with a negated
- // value.
- //
- // If there is an error during semantic analysis,
- // then an error should be reported (using Report)
- // and a null value should be returned.
- //
- // There are two side effects expected from calling
- // Resolve(): the the field variable "eclass" should
- // be set to any value of the enumeration
- // `ExprClass' and the type variable should be set
- // to a valid type (this is the type of the
- // expression).
- // </remarks>
-
- public abstract Expression DoResolve (EmitContext ec);
-
- public virtual Expression DoResolveLValue (EmitContext ec, Expression right_side)
- {
- return DoResolve (ec);
- }
-
- //
- // Currently Resolve wraps DoResolve to perform sanity
- // checking and assertion checking on what we expect from Resolve
- //
- public Expression Resolve (EmitContext ec)
- {
- Expression e = DoResolve (ec);
-
- 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 + "'");
- 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 e;
- }
-
- //
- // Just like `Resolve' above, but this 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).
- //
- public Expression ResolveWithSimpleName (EmitContext ec)
- {
- Expression e = DoResolve (ec);
-
- if (e != null){
- if (e is SimpleName)
- return e;
-
- 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 e;
- }
-
- //
- // Currently ResolveLValue wraps DoResolveLValue to perform sanity
- // checking and assertion checking on what we expect from Resolve
- //
- public Expression ResolveLValue (EmitContext ec, Expression right_side)
- {
- Expression e = DoResolveLValue (ec, right_side);
-
- 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 + "'");
- 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 e;
- }
-
- // <summary>
- // Emits the code for the expression
- // </summary>
- //
- // <remarks>
- //
- // The Emit method is invoked to generate the code
- // for the expression.
- //
- // </remarks>
- public abstract void Emit (EmitContext ec);
-
- // <summary>
- // Protected constructor. Only derivate types should
- // be able to be created
- // </summary>
-
- protected Expression ()
- {
- eclass = ExprClass.Invalid;
- type = null;
- }
-
- // <summary>
- // Returns a literalized version of a literal FieldInfo
- // </summary>
- static Expression Literalize (FieldInfo fi)
- {
- Type t = fi.FieldType;
- object v = fi.GetValue (fi);
-
- if (t == TypeManager.int32_type)
- return new IntLiteral ((int) v);
- else if (t == TypeManager.uint32_type)
- return new UIntLiteral ((uint) v);
- else if (t == TypeManager.int64_type)
- return new LongLiteral ((long) v);
- else if (t == TypeManager.uint64_type)
- return new ULongLiteral ((ulong) v);
- else if (t == TypeManager.float_type)
- return new FloatLiteral ((float) v);
- else if (t == TypeManager.double_type)
- return new DoubleLiteral ((double) v);
- else if (t == TypeManager.string_type)
- return new StringLiteral ((string) v);
- else if (t == TypeManager.short_type)
- return new IntLiteral ((int) ((short)v));
- else if (t == TypeManager.ushort_type)
- return new IntLiteral ((int) ((ushort)v));
- else if (t == TypeManager.sbyte_type)
- return new IntLiteral ((int) ((sbyte)v));
- else if (t == TypeManager.byte_type)
- return new IntLiteral ((int) ((byte)v));
- else if (t == TypeManager.char_type)
- return new IntLiteral ((int) ((char)v));
- else
- throw new Exception ("Unknown type for literal (" + v.GetType () +
- "), details: " + fi);
- }
-
- //
- // Returns a fully formed expression after a MemberLookup
- //
- static Expression ExprClassFromMemberInfo (EmitContext ec, MemberInfo mi, Location loc)
- {
- if (mi is EventInfo){
- return new EventExpr ((EventInfo) mi, loc);
- } else if (mi is FieldInfo){
- FieldInfo fi = (FieldInfo) mi;
-
- if (fi.IsLiteral){
- Expression e = Literalize (fi);
- e.Resolve (ec);
-
- return e;
- } else
- return new FieldExpr (fi, loc);
- } else if (mi is PropertyInfo){
- return new PropertyExpr ((PropertyInfo) mi, loc);
- } else if (mi is Type)
- return new TypeExpr ((Type) mi);
-
- 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
- // else).
- //
- // Return values:
- // If the return value is an Array, then it is an array of
- // MethodBases
- //
- // If the return value is an MemberInfo, it is anything, but a Method
- //
- // null on error.
- //
- // FIXME: When calling MemberLookup inside an `Invocation', we should pass
- // the arguments here and have MemberLookup return only the methods that
- // match the argument count/type, unlike we are doing now (we delay this
- // decision).
- //
- // 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)
- {
- if (same_type)
- bf |= BindingFlags.NonPublic;
-
- MemberInfo [] mi = ec.TypeContainer.RootContext.TypeManager.FindMembers (
- t, mt, bf, Type.FilterName, name);
-
- if (mi == null)
- return null;
-
- // Empty array ...
- if (mi.Length == 0)
- return null;
-
-
- 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;
- }
- }
- }
-
- return new MethodGroupExpr (mi);
- }
-
- public const MemberTypes AllMemberTypes =
- MemberTypes.Constructor |
- MemberTypes.Event |
- MemberTypes.Field |
- MemberTypes.Method |
- MemberTypes.NestedType |
- MemberTypes.Property;
-
- public const BindingFlags AllBindingsFlags =
- BindingFlags.Public |
- BindingFlags.Static |
- BindingFlags.Instance;
-
- public static Expression MemberLookup (EmitContext ec, Type t, string name,
- bool same_type, Location loc)
- {
- return MemberLookup (ec, t, name, same_type, AllMemberTypes, AllBindingsFlags, loc);
- }
-
- 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.IsValueType)
- return new BoxedCast (expr);
- } else if (expr_type.IsSubclassOf (target_type)) {
- 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;
- }
-
- // 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
- return null;
- }
-
- // 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 new EmptyCast (expr, target_type);
- }
- }
-
-
- // from an array-type to System.Array
- if (expr_type.IsArray && target_type == TypeManager.array_type)
- return new EmptyCast (expr, target_type);
-
- // from any delegate type to System.Delegate
- if (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 (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.
- //
- // expr is the expression to convert, returns a new expression of type
- // target_type or null if an implicit conversion is not possible.
- //
- // </summary>
- static public Expression ImplicitNumericConversion (EmitContext ec, Expression expr,
- Type target_type, Location loc)
- {
- Type expr_type = expr.Type;
-
- //
- // Attempt to do the implicit constant expression conversions
-
- if (expr is IntLiteral){
- Expression e;
-
- e = TryImplicitIntConversion (target_type, (IntLiteral) expr);
- if (e != null)
- return e;
- } else if (expr is LongLiteral){
- //
- // 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_type == TypeManager.sbyte_type){
- //
- // From sbyte to short, int, long, float, double.
- //
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- if (target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (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))
- return new EmptyCast (expr, target_type);
-
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
-
- if (target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (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)
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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);
- } else if (expr_type == TypeManager.ushort_type){
- //
- // From ushort to int, uint, long, ulong, float, double
- //
- 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_U8);
- if (target_type == TypeManager.int32_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I4);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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);
- } else if (expr_type == TypeManager.int32_type){
- //
- // From int to long, float, double
- //
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- 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);
- } else if (expr_type == TypeManager.uint32_type){
- //
- // From uint to long, ulong, float, double
- //
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R8);
- if (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)){
- //
- // From long/ulong to float, double
- //
- if (target_type == TypeManager.double_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R_Un,
- OpCodes.Conv_R8);
- if (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))
- return new EmptyCast (expr, target_type);
- if (target_type == TypeManager.uint64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_U8);
- if (target_type == TypeManager.int64_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_I8);
- if (target_type == TypeManager.float_type)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);
- if (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)
- return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
- }
-
- return 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)
- {
- if (expr_type == target_type)
- return true;
-
- // First numeric conversions
-
- if (expr_type == TypeManager.sbyte_type){
- //
- // From sbyte to short, int, long, float, double.
- //
- if ((target_type == TypeManager.int32_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.short_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } 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) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.short_type){
- //
- // From short to int, long, float, double
- //
- if ((target_type == TypeManager.int32_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.ushort_type){
- //
- // From ushort to int, uint, long, ulong, float, double
- //
- if ((target_type == TypeManager.uint32_type) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.int32_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.int32_type){
- //
- // From int to long, float, double
- //
- if ((target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.uint32_type){
- //
- // From uint to long, ulong, float, double
- //
- if ((target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if ((expr_type == TypeManager.uint64_type) ||
- (expr_type == TypeManager.int64_type)) {
- //
- // From long/ulong to float, double
- //
- if ((target_type == TypeManager.double_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } 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) ||
- (target_type == TypeManager.uint64_type) ||
- (target_type == TypeManager.int64_type) ||
- (target_type == TypeManager.float_type) ||
- (target_type == TypeManager.double_type) ||
- (target_type == TypeManager.decimal_type))
- return true;
-
- } else if (expr_type == TypeManager.float_type){
- //
- // float to double
- //
- if (target_type == TypeManager.double_type)
- 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)) {
- 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))
- 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))
- 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)
- return true;
-
- // from the null type to any reference-type.
- // FIXME : How do we do this ?
-
- }
-
- return false;
- }
-
- // <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
- // </summary>
- static Type FindMostEncompassedType (MethodGroupExpr me, Type source_type)
- {
- 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 (StandardConversionExists (source_type, param_type)) {
- if (best == null)
- best = param_type;
-
- if (StandardConversionExists (param_type, best))
- best = param_type;
- }
- }
-
- return best;
- }
-
- // <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
- // </summary>
- static Type FindMostEncompassingType (MethodGroupExpr me, Type target)
- {
- 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;
- }
-
- }
-
- return best;
-
- }
-
-
- // <summary>
- // User-defined Implicit conversions
- // </summary>
- static public Expression ImplicitUserConversion (EmitContext ec, Expression source,
- Type target, Location loc)
- {
- return UserDefinedConversion (ec, source, target, loc, false);
- }
-
- // <summary>
- // User-defined Explicit conversions
- // </summary>
- static public Expression ExplicitUserConversion (EmitContext ec, Expression source,
- Type target, Location loc)
- {
- return UserDefinedConversion (ec, source, target, loc, true);
- }
-
- // <summary>
- // User-defined conversions
- // </summary>
- static public Expression UserDefinedConversion (EmitContext ec, Expression source,
- Type target, Location loc,
- bool look_for_explicit)
- {
- Expression mg1 = null, mg2 = null, mg3 = null, mg4 = 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)
- 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);
-
- mg3 = MemberLookup (ec, target, op_name, false, loc);
-
- if (target.BaseType != null)
- mg4 = MemberLookup (ec, target.BaseType, op_name, false, loc);
-
- MethodGroupExpr union1 = Invocation.MakeUnionSet (mg1, mg2);
- MethodGroupExpr union2 = Invocation.MakeUnionSet (mg3, mg4);
-
- MethodGroupExpr union3 = Invocation.MakeUnionSet (union1, union2);
-
- MethodGroupExpr union4 = null;
-
- if (look_for_explicit) {
-
- op_name = "op_Explicit";
-
- mg5 = MemberLookup (ec, source_type, op_name, false, loc);
-
- if (source_type.BaseType != null)
- mg6 = MemberLookup (ec, source_type.BaseType, op_name, false, loc);
-
- mg7 = MemberLookup (ec, target, op_name, false, loc);
-
- if (target.BaseType != null)
- mg8 = MemberLookup (ec, target.BaseType, op_name, false, loc);
-
- MethodGroupExpr union5 = Invocation.MakeUnionSet (mg5, mg6);
- MethodGroupExpr union6 = Invocation.MakeUnionSet (mg7, mg8);
-
- union4 = Invocation.MakeUnionSet (union5, union6);
- }
-
- MethodGroupExpr union = Invocation.MakeUnionSet (union3, union4);
-
- if (union != null) {
-
- Type most_specific_source, most_specific_target;
-
- most_specific_source = FindMostEncompassedType (union, source_type);
- if (most_specific_source == null)
- return null;
-
- 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--;
-
- MethodBase mb = union.Methods [i];
- ParameterData pd = Invocation.GetParameterData (mb);
- MethodInfo mi = (MethodInfo) union.Methods [i];
-
- if (pd.ParameterType (0) == most_specific_source &&
- mi.ReturnType == most_specific_target) {
- method = mb;
- count++;
- }
- }
-
- if (method == null || count > 1) {
- Report.Error (-11, loc, "Ambiguous user defined conversion");
- 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);
-
- return e;
- } else
- return e;
- }
-
- return null;
- }
-
- // <summary>
- // Converts implicitly the resolved expression `expr' into the
- // `target_type'. It returns a new expression that can be used
- // in a context that expects a `target_type'.
- // </summary>
- static public Expression ConvertImplicit (EmitContext ec, Expression expr,
- Type target_type, Location loc)
- {
- Type expr_type = expr.Type;
- Expression e;
-
- if (expr_type == target_type)
- return expr;
-
- e = ImplicitNumericConversion (ec, expr, target_type, loc);
- if (e != null)
- return e;
-
- e = ImplicitReferenceConversion (expr, target_type);
- if (e != null)
- return e;
-
- e = ImplicitUserConversion (ec, expr, target_type, loc);
- 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;
- }
-
-
- // <summary>
- // Attempts to apply the `Standard Implicit
- // Conversion' rules to the expression `expr' into
- // the `target_type'. It returns a new expression
- // that can be used in a context that expects a
- // `target_type'.
- //
- // This is different from `ConvertImplicit' in that the
- // user defined implicit conversions are excluded.
- // </summary>
- static public Expression ConvertImplicitStandard (EmitContext ec, Expression expr,
- Type target_type, Location loc)
- {
- Type expr_type = expr.Type;
- Expression e;
-
- if (expr_type == target_type)
- return expr;
-
- e = ImplicitNumericConversion (ec, expr, target_type, loc);
- if (e != null)
- return e;
-
- e = ImplicitReferenceConversion (expr, target_type);
- 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;
- }
- // <summary>
- // Attemps to perform an implict constant conversion of the IntLiteral
- // into a different data type using casts (See Implicit Constant
- // Expression Conversions)
- // </summary>
- static protected Expression TryImplicitIntConversion (Type target_type, IntLiteral il)
- {
- int value = il.Value;
-
- if (target_type == TypeManager.sbyte_type){
- if (value >= SByte.MinValue && value <= SByte.MaxValue)
- return il;
- } else if (target_type == TypeManager.byte_type){
- if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
- return il;
- } else if (target_type == TypeManager.short_type){
- if (value >= Int16.MinValue && value <= Int16.MaxValue)
- return il;
- } else if (target_type == TypeManager.ushort_type){
- if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
- return il;
- } else if (target_type == TypeManager.uint32_type){
- //
- // we can optimize this case: a positive int32
- // always fits on a uint32
- //
- if (value >= 0)
- return il;
- } 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 new OpcodeCast (il, target_type, OpCodes.Conv_I8);
- }
-
- return null;
- }
-
- // <summary>
- // Attemptes to implicityly convert `target' into `type', using
- // ConvertImplicit. If there is no implicit conversion, then
- // an error is signaled
- // </summary>
- static public Expression ConvertImplicitRequired (EmitContext ec, Expression target,
- Type type, Location loc)
- {
- Expression e;
-
- e = ConvertImplicit (ec, target, type, loc);
- if (e != null)
- return e;
-
- string msg = "Can not convert implicitly from `"+
- TypeManager.CSharpName (target.Type) + "' to `" +
- TypeManager.CSharpName (type) + "'";
-
- Error (29, loc, msg);
-
- return null;
- }
-
- // <summary>
- // Performs the explicit numeric conversions
- // </summary>
- static Expression ConvertNumericExplicit (EmitContext ec, Expression expr,
- Type target_type)
- {
- Type expr_type = expr.Type;
-
- 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- } 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);
- }
-
- // decimal is taken care of by the op_Explicit methods.
-
- return null;
- }
-
- // <summary>
- // 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)
- {
- bool target_is_value_type = target_type.IsValueType;
-
- if (source_type == target_type)
- return true;
-
- //
- // From object to any reference type
- //
- if (source_type == TypeManager.object_type && !target_is_value_type)
- return true;
-
- //
- // From any class S to any class-type T, provided S is a base class of T
- //
- if (target_type.IsSubclassOf (source_type))
- return true;
-
- //
- // From any interface type S to any interface T provided S is not derived from T
- //
- if (source_type.IsInterface && target_type.IsInterface){
- if (!target_type.IsSubclassOf (source_type))
- return true;
- }
-
- //
- // From any class type S to any interface T, provides S is not sealed
- // and provided S does not implement T.
- //
- if (target_type.IsInterface && !source_type.IsSealed &&
- !target_type.IsAssignableFrom (source_type))
- return true;
-
- //
- // From any interface-type S to to any class type T, provided T is not
- // sealed, or provided T implements S.
- //
- if (source_type.IsInterface &&
- (!target_type.IsSealed || source_type.IsAssignableFrom (target_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
- // have the same number of dimensions.
- // * Both Se and Te are reference types
- // * An explicit referenc conversions exist from Se to Te
- //
- if (source_type.IsArray && target_type.IsArray) {
- if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
- Type source_element_type = source_type.GetElementType ();
- Type target_element_type = target_type.GetElementType ();
-
- if (!source_element_type.IsValueType && !target_element_type.IsValueType)
- if (ExplicitReferenceConversionExists (source_element_type,
- target_element_type))
- return true;
- }
- }
-
-
- // From System.Array to any array-type
- if (source_type == TypeManager.array_type &&
- target_type.IsSubclassOf (TypeManager.array_type)){
- return true;
- }
-
- //
- // From System delegate to any delegate-type
- //
- if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
- return true;
-
- //
- // From ICloneable to Array or Delegate types
- //
- if (source_type == TypeManager.icloneable_type &&
- (target_type == TypeManager.array_type ||
- target_type == TypeManager.delegate_type))
- return true;
-
- return false;
- }
-
- // <summary>
- // Implements Explicit Reference conversions
- // </summary>
- static Expression ConvertReferenceExplicit (Expression source, Type target_type)
- {
- Type source_type = source.Type;
- bool target_is_value_type = target_type.IsValueType;
-
- //
- // From object to any reference type
- //
- if (source_type == TypeManager.object_type && !target_is_value_type)
- return new ClassCast (source, target_type);
-
-
- //
- // From any class S to any class-type T, provided S is a base class of T
- //
- if (target_type.IsSubclassOf (source_type))
- return new ClassCast (source, target_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
- return new ClassCast (source, target_type);
- }
-
- //
- // From any class type S to any interface T, provides S is not sealed
- // and provided S does not implement T.
- //
- if (target_type.IsInterface && !source_type.IsSealed) {
-
- if (TypeManager.ImplementsInterface (source_type, target_type))
- return null;
- else
- return new ClassCast (source, target_type);
-
- }
-
- //
- // From any interface-type S to to any class type T, provided T is not
- // sealed, or provided T implements S.
- //
- if (source_type.IsInterface) {
-
- if (target_type.IsSealed)
- return null;
-
- if (TypeManager.ImplementsInterface (target_type, source_type))
- return new ClassCast (source, target_type);
- else
- return null;
- }
-
- // 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
- // have the same number of dimensions.
- // * Both Se and Te are reference types
- // * An explicit referenc conversions exist from Se to Te
- //
- if (source_type.IsArray && target_type.IsArray) {
- if (source_type.GetArrayRank () == target_type.GetArrayRank ()) {
-
- Type source_element_type = source_type.GetElementType ();
- Type target_element_type = target_type.GetElementType ();
-
- if (!source_element_type.IsValueType && !target_element_type.IsValueType)
- if (ExplicitReferenceConversionExists (source_element_type,
- target_element_type))
- return new ClassCast (source, target_type);
- }
- }
-
-
- // From System.Array to any array-type
- if (source_type == TypeManager.array_type &&
- target_type.IsSubclassOf (TypeManager.array_type)){
- return new ClassCast (source, target_type);
- }
-
- //
- // From System delegate to any delegate-type
- //
- if (source_type == TypeManager.delegate_type &&
- target_type.IsSubclassOf (TypeManager.delegate_type))
- return new ClassCast (source, target_type);
-
- //
- // From ICloneable to Array or Delegate types
- //
- if (source_type == TypeManager.icloneable_type &&
- (target_type == TypeManager.array_type ||
- target_type == TypeManager.delegate_type))
- return new ClassCast (source, target_type);
-
- return null;
- }
-
- // <summary>
- // Performs an explicit conversion of the expression `expr' whose
- // type is expr.Type to `target_type'.
- // </summary>
- static public Expression ConvertExplicit (EmitContext ec, Expression expr,
- Type target_type, Location loc)
- {
- Expression ne = ConvertImplicitStandard (ec, expr, target_type, loc);
-
- if (ne != null)
- return ne;
-
- ne = ConvertNumericExplicit (ec, expr, target_type);
- if (ne != null)
- return ne;
-
- ne = ConvertReferenceExplicit (expr, target_type);
- if (ne != null)
- return ne;
-
- ne = ExplicitUserConversion (ec, expr, target_type, loc);
- if (ne != null)
- return ne;
-
- Report.Error (30, loc, "Cannot convert type '" + TypeManager.CSharpName (expr.Type) + "' to '"
- + TypeManager.CSharpName (target_type) + "'");
- return null;
- }
-
- // <summary>
- // Same as ConverExplicit, only it doesn't include user defined conversions
- // </summary>
- static public Expression ConvertExplicitStandard (EmitContext ec, Expression expr,
- Type target_type, Location l)
- {
- Expression ne = ConvertImplicitStandard (ec, expr, target_type, l);
-
- if (ne != null)
- return ne;
-
- ne = ConvertNumericExplicit (ec, expr, target_type);
- if (ne != null)
- return ne;
-
- ne = ConvertReferenceExplicit (expr, target_type);
- if (ne != null)
- return ne;
-
- Report.Error (30, l, "Cannot convert type '" +
- TypeManager.CSharpName (expr.Type) + "' to '" +
- TypeManager.CSharpName (target_type) + "'");
- return null;
- }
-
- static string ExprClassName (ExprClass c)
- {
- switch (c){
- case ExprClass.Invalid:
- return "Invalid";
- case ExprClass.Value:
- return "value";
- case ExprClass.Variable:
- return "variable";
- case ExprClass.Namespace:
- return "namespace";
- case ExprClass.Type:
- return "type";
- case ExprClass.MethodGroup:
- return "method group";
- case ExprClass.PropertyAccess:
- return "property access";
- case ExprClass.EventAccess:
- return "event access";
- case ExprClass.IndexerAccess:
- return "indexer access";
- case ExprClass.Nothing:
- return "null";
- }
- throw new Exception ("Should not happen");
- }
-
- // <summary>
- // Reports that we were expecting `expr' to be of class `expected'
- // </summary>
- protected void report118 (Location loc, Expression expr, string expected)
- {
- string kind = "Unknown";
-
- if (expr != null)
- kind = ExprClassName (expr.ExprClass);
-
- Error (118, loc, "Expression denotes a '" + kind +
- "' where an " + expected + " was expected");
- }
- }
- // <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);
- }
+namespace CIR {
+ using System;
+ using System.Collections;
+ using System.Diagnostics;
+ using System.Reflection;
+ using System.Reflection.Emit;
+ using System.Text;
// <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".
- //
+ // This is just a helper class, it is generated by Unary, UnaryMutator
+ // when an overloaded method has been found. It just emits the code for a
+ // static call.
// </summary>
-
- public class EmptyCast : Expression {
- protected Expression child;
-
- public EmptyCast (Expression child, Type return_type)
- {
- ExprClass = child.ExprClass;
- 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 class StaticCallExpr : ExpressionStatement {
+ ArrayList args;
+ MethodInfo mi;
- public override void Emit (EmitContext ec)
+ StaticCallExpr (MethodInfo m, ArrayList a)
{
- child.Emit (ec);
- }
- }
-
- // <summary>
- // This kind of cast is used to encapsulate Value Types in objects.
- //
- // The effect of it is to box the value type emitted by the previous
- // operation.
- // </summary>
- public class BoxedCast : EmptyCast {
+ mi = m;
+ args = a;
- public BoxedCast (Expression expr)
- : base (expr, TypeManager.object_type)
- {
+ type = m.ReturnType;
+ eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
- // This should never be invoked, we are born in fully
- // initialized state.
-
+ //
+ // We are born fully resolved
+ //
return this;
}
public override void Emit (EmitContext ec)
{
- base.Emit (ec);
- ec.ig.Emit (OpCodes.Box, child.Type);
- }
- }
+ if (args != null)
+ Invocation.EmitArguments (ec, mi, args);
- // <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.
- // </summary>
- public class OpcodeCast : EmptyCast {
- OpCode op, op2;
- bool second_valid;
+ ec.ig.Emit (OpCodes.Call, mi);
+ return;
+ }
- public OpcodeCast (Expression child, Type return_type, OpCode op)
- : base (child, return_type)
-
+ static public Expression MakeSimpleCall (EmitContext ec, MethodGroupExpr mg,
+ Expression e, Location loc)
{
- this.op = op;
- second_valid = false;
- }
-
- public OpcodeCast (Expression child, Type return_type, OpCode op, OpCode op2)
- : base (child, return_type)
+ ArrayList args;
+ MethodBase method;
- {
- this.op = op;
- this.op2 = op2;
- second_valid = true;
- }
-
- 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)
- {
- base.Emit (ec);
- ec.ig.Emit (op);
+ args = new ArrayList (1);
+ args.Add (new Argument (e, Argument.AType.Expression));
+ method = Invocation.OverloadResolve (ec, (MethodGroupExpr) mg, args, loc);
- if (second_valid)
- ec.ig.Emit (op2);
- }
-
- }
+ if (method == null)
+ return null;
- // <summary>
- // This kind of cast is used to encapsulate a child and cast it
- // to the class requested
- // </summary>
- public class ClassCast : EmptyCast {
- public ClassCast (Expression child, Type return_type)
- : base (child, return_type)
-
- {
+ return new StaticCallExpr ((MethodInfo) method, args);
}
- public override Expression DoResolve (EmitContext ec)
+ public override void EmitStatement (EmitContext ec)
{
- // This should never be invoked, we are born in fully
- // initialized state.
-
- return this;
+ Emit (ec);
+ if (type != TypeManager.void_type)
+ ec.ig.Emit (OpCodes.Pop);
}
-
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
-
- ec.ig.Emit (OpCodes.Castclass, type);
- }
-
}
// <summary>
// ExpressionStatement becuase the pre/post increment/decrement
// operators can be used in a statement context.
// </remarks>
- public class Unary : ExpressionStatement {
- public enum Operator {
+ public class Unary : Expression {
+ public enum Operator : byte {
UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
- Indirection, AddressOf, PreIncrement,
- PreDecrement, PostIncrement, PostDecrement
+ Indirection, AddressOf,
}
Operator oper;
Expression expr;
- ArrayList Arguments;
- MethodBase method;
Location loc;
public Unary (Operator op, Expression expr, Location loc)
case Operator.AddressOf:
return "&";
case Operator.Indirection:
- return "*";
- case Operator.PreIncrement : case Operator.PostIncrement :
- return "++";
- case Operator.PreDecrement : case Operator.PostDecrement :
- return "--";
- }
-
- return oper.ToString ();
- }
-
- Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
- {
- if (expr.Type == target_type)
- return expr;
+ return "*";
+ }
- return ConvertImplicit (ec, expr, target_type, new Location (-1));
+ return oper.ToString ();
}
void error23 (Type t)
TypeManager.CSharpName (t) + "'");
}
- // <summary>
- // Returns whether an object of type `t' can be incremented
- // or decremented with add/sub (ie, basically whether we can
- // use pre-post incr-decr operations on it, but it is not a
- // System.Decimal, which we test elsewhere)
- // </summary>
- static bool IsIncrementableNumber (Type t)
+ static Expression TryReduceNegative (Expression expr)
{
- return (t == TypeManager.sbyte_type) ||
- (t == TypeManager.byte_type) ||
- (t == TypeManager.short_type) ||
- (t == TypeManager.ushort_type) ||
- (t == TypeManager.int32_type) ||
- (t == TypeManager.uint32_type) ||
- (t == TypeManager.int64_type) ||
- (t == TypeManager.uint64_type) ||
- (t == TypeManager.char_type) ||
- (t.IsSubclassOf (TypeManager.enum_type)) ||
- (t == TypeManager.float_type) ||
- (t == TypeManager.double_type);
- }
+ Expression e = null;
+ if (expr is IntLiteral)
+ e = new IntLiteral (-((IntLiteral) expr).Value);
+ else if (expr is UIntLiteral)
+ e = new LongLiteral (-((UIntLiteral) expr).Value);
+ else if (expr is LongLiteral)
+ e = new LongLiteral (-((LongLiteral) expr).Value);
+ else if (expr is FloatLiteral)
+ e = new FloatLiteral (-((FloatLiteral) expr).Value);
+ else if (expr is DoubleLiteral)
+ e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
+ else if (expr is DecimalLiteral)
+ e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
+
+ return e;
+ }
+
Expression ResolveOperator (EmitContext ec)
{
Type expr_type = expr.Type;
Expression mg;
string op_name;
- if (oper == Operator.PostIncrement || oper == Operator.PreIncrement)
- op_name = "op_Increment";
- else if (oper == Operator.PostDecrement || oper == Operator.PreDecrement)
- op_name = "op_Decrement";
- else
- op_name = "op_" + oper;
+ op_name = "op_" + oper;
mg = MemberLookup (ec, expr_type, op_name, false, loc);
mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
if (mg != null) {
- Arguments = new ArrayList ();
- Arguments.Add (new Argument (expr, Argument.AType.Expression));
-
- method = Invocation.OverloadResolve (ec, (MethodGroupExpr) mg,
- Arguments, loc);
- if (method != null) {
- MethodInfo mi = (MethodInfo) method;
- type = mi.ReturnType;
- return this;
- } else {
+ Expression e = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, expr, loc);
+
+ if (e == null){
error23 (expr_type);
return null;
}
-
+
+ return e;
}
//
//
// Only perform numeric promotions on:
- // +, -, ++, --
+ // +, -
if (expr_type == null)
return null;
//
// Is this a constant?
//
- if (expr is IntLiteral)
- e = new IntLiteral (-((IntLiteral) expr).Value);
- else if (expr is LongLiteral)
- e = new LongLiteral (-((LongLiteral) expr).Value);
- else if (expr is FloatLiteral)
- e = new FloatLiteral (-((FloatLiteral) expr).Value);
- else if (expr is DoubleLiteral)
- e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
- else if (expr is DecimalLiteral)
- e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
+ e = TryReduceNegative (expr);
if (e != null){
e = e.Resolve (ec);
return null;
}
- //
- // The operand of the prefix/postfix increment decrement operators
- // should be an expression that is classified as a variable,
- // a property access or an indexer access
- //
- if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
- oper == Operator.PostDecrement || oper == Operator.PostIncrement){
- if (expr.ExprClass == ExprClass.Variable){
- if (IsIncrementableNumber (expr_type) ||
- expr_type == TypeManager.decimal_type){
- type = expr_type;
- return this;
- }
- } else if (expr.ExprClass == ExprClass.IndexerAccess){
- //
- // FIXME: Verify that we have both get and set methods
- //
- throw new Exception ("Implement me");
- } else if (expr.ExprClass == ExprClass.PropertyAccess){
- PropertyExpr pe = (PropertyExpr) expr;
-
- if (pe.VerifyAssignable ())
- return this;
- return null;
- } else {
- report118 (loc, expr, "variable, indexer or property access");
- }
- }
-
if (oper == Operator.AddressOf){
if (expr.ExprClass != ExprClass.Variable){
- Error (211, "Cannot take the address of non-variables");
+ Error (211, loc, "Cannot take the address of non-variables");
return null;
}
type = Type.GetType (expr.Type.ToString () + "*");
+
+ return this;
}
- Error (187, "No such operator '" + OperName () + "' defined for type '" +
+ Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
TypeManager.CSharpName (expr_type) + "'");
return null;
-
}
public override Expression DoResolve (EmitContext ec)
{
ILGenerator ig = ec.ig;
Type expr_type = expr.Type;
- ExprClass eclass;
-
- if (method != null) {
-
- // Note that operators are static anyway
-
- if (Arguments != null)
- Invocation.EmitArguments (ec, Arguments);
-
- //
- // Post increment/decrement operations need a copy at this
- // point.
- //
- if (oper == Operator.PostDecrement || oper == Operator.PostIncrement)
- ig.Emit (OpCodes.Dup);
-
-
- ig.Emit (OpCodes.Call, (MethodInfo) method);
-
- //
- // Pre Increment and Decrement operators
- //
- if (oper == Operator.PreIncrement || oper == Operator.PreDecrement){
- ig.Emit (OpCodes.Dup);
- }
-
- //
- // Increment and Decrement should store the result
- //
- if (oper == Operator.PreDecrement || oper == Operator.PreIncrement ||
- oper == Operator.PostDecrement || oper == Operator.PostIncrement){
- ((IStackStore) expr).Store (ec);
- }
- return;
- }
switch (oper) {
case Operator.UnaryPlus:
case Operator.Indirection:
throw new Exception ("Not implemented yet");
- case Operator.PreIncrement:
- case Operator.PreDecrement:
- if (expr.ExprClass == ExprClass.Variable){
- //
- // Resolve already verified that it is an "incrementable"
- //
+ default:
+ throw new Exception ("This should not happen: Operator = "
+ + oper.ToString ());
+ }
+ }
+
+ // <summary>
+ // This will emit the child expression for `ec' avoiding the logical
+ // not. The parent will take care of changing brfalse/brtrue
+ // </summary>
+ public void EmitLogicalNot (EmitContext ec)
+ {
+ if (oper != Operator.LogicalNot)
+ throw new Exception ("EmitLogicalNot can only be called with !expr");
+
+ expr.Emit (ec);
+ }
+
+ public override Expression Reduce (EmitContext ec)
+ {
+ Expression e;
+
+ //
+ // First, reduce our child. Note that although we handle
+ //
+ expr = expr.Reduce (ec);
+ if (!(expr is Literal))
+ return expr;
+
+ switch (oper){
+ case Operator.UnaryPlus:
+ return expr;
+
+ case Operator.UnaryNegation:
+ e = TryReduceNegative (expr);
+ if (e == null)
+ break;
+ return e;
+
+ case Operator.LogicalNot:
+ BoolLiteral b = (BoolLiteral) expr;
+
+ return new BoolLiteral (!(b.Value));
+
+ case Operator.OnesComplement:
+ Type et = expr.Type;
+
+ if (et == TypeManager.int32_type)
+ return new IntLiteral (~ ((IntLiteral) expr).Value);
+ if (et == TypeManager.uint32_type)
+ return new UIntLiteral (~ ((UIntLiteral) expr).Value);
+ if (et == TypeManager.int64_type)
+ return new LongLiteral (~ ((LongLiteral) expr).Value);
+ if (et == TypeManager.uint64_type)
+ return new ULongLiteral (~ ((ULongLiteral) expr).Value);
+ break;
+ }
+ return this;
+ }
+ }
+
+ // <summary>
+ // Unary Mutator expressions (pre and post ++ and --)
+ // </summary>
+ //
+ // <remarks>
+ // UnaryMutator implements ++ and -- expressions. It derives from
+ // ExpressionStatement becuase the pre/post increment/decrement
+ // operators can be used in a statement context.
+ // </remarks>
+ //
+ // FIXME: Idea, we could split this up in two classes, one simpler
+ // for the common case, and one with the extra fields for more complex
+ // classes (indexers require temporary access; overloaded require method)
+ //
+ // Maybe we should have classes PreIncrement, PostIncrement, PreDecrement,
+ // PostDecrement, that way we could save the `Mode' byte as well.
+ //
+ public class UnaryMutator : ExpressionStatement {
+ public enum Mode : byte {
+ PreIncrement, PreDecrement, PostIncrement, PostDecrement
+ }
+
+ Mode mode;
+ Location loc;
+ Expression expr;
+ LocalTemporary temp_storage;
+
+ //
+ // This is expensive for the simplest case.
+ //
+ Expression method;
+
+ public UnaryMutator (Mode m, Expression e, Location l)
+ {
+ mode = m;
+ loc = l;
+ expr = e;
+ }
+
+ string OperName ()
+ {
+ return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
+ "++" : "--";
+ }
+
+ void error23 (Type t)
+ {
+ Report.Error (
+ 23, loc, "Operator " + OperName () +
+ " cannot be applied to operand of type `" +
+ TypeManager.CSharpName (t) + "'");
+ }
+
+ // <summary>
+ // Returns whether an object of type `t' can be incremented
+ // or decremented with add/sub (ie, basically whether we can
+ // use pre-post incr-decr operations on it, but it is not a
+ // System.Decimal, which we require operator overloading to catch)
+ // </summary>
+ static bool IsIncrementableNumber (Type t)
+ {
+ return (t == TypeManager.sbyte_type) ||
+ (t == TypeManager.byte_type) ||
+ (t == TypeManager.short_type) ||
+ (t == TypeManager.ushort_type) ||
+ (t == TypeManager.int32_type) ||
+ (t == TypeManager.uint32_type) ||
+ (t == TypeManager.int64_type) ||
+ (t == TypeManager.uint64_type) ||
+ (t == TypeManager.char_type) ||
+ (t.IsSubclassOf (TypeManager.enum_type)) ||
+ (t == TypeManager.float_type) ||
+ (t == TypeManager.double_type);
+ }
+
+ Expression ResolveOperator (EmitContext ec)
+ {
+ Type expr_type = expr.Type;
+
+ //
+ // Step 1: Perform Operator Overload location
+ //
+ Expression mg;
+ string op_name;
+
+ if (mode == Mode.PreIncrement || mode == Mode.PostIncrement)
+ op_name = "op_Increment";
+ else
+ op_name = "op_Decrement";
+
+ mg = MemberLookup (ec, expr_type, op_name, false, loc);
+
+ if (mg == null && expr_type.BaseType != null)
+ mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
+
+ if (mg != null) {
+ method = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, expr, loc);
+
+ type = method.Type;
+ return this;
+ }
+
+ //
+ // The operand of the prefix/postfix increment decrement operators
+ // should be an expression that is classified as a variable,
+ // a property access or an indexer access
+ //
+ type = expr_type;
+ if (expr.ExprClass == ExprClass.Variable){
+ if (IsIncrementableNumber (expr_type) ||
+ expr_type == TypeManager.decimal_type){
+ return this;
+ }
+ } else if (expr.ExprClass == ExprClass.IndexerAccess){
+ IndexerAccess ia = (IndexerAccess) expr;
+
+ temp_storage = new LocalTemporary (ec, expr.Type);
+
+ expr = ia.ResolveLValue (ec, temp_storage);
+ if (expr == null)
+ return null;
+
+ return this;
+ } else if (expr.ExprClass == ExprClass.PropertyAccess){
+ PropertyExpr pe = (PropertyExpr) expr;
+
+ if (pe.VerifyAssignable ())
+ return this;
+
+ return null;
+ } else {
+ report118 (loc, expr, "variable, indexer or property access");
+ return null;
+ }
+
+ Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
+ TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr == null)
+ return null;
+
+ eclass = ExprClass.Value;
+ return ResolveOperator (ec);
+ }
+
+
+ //
+ // FIXME: We need some way of avoiding the use of temp_storage
+ // for some types of storage (parameters, local variables,
+ // static fields) and single-dimension array access.
+ //
+ void EmitCode (EmitContext ec, bool is_expr)
+ {
+ ILGenerator ig = ec.ig;
+ IAssignMethod ia = (IAssignMethod) expr;
+
+ if (temp_storage == null)
+ temp_storage = new LocalTemporary (ec, expr.Type);
+
+ switch (mode){
+ case Mode.PreIncrement:
+ case Mode.PreDecrement:
+ if (method == null){
expr.Emit (ec);
+
ig.Emit (OpCodes.Ldc_I4_1);
-
- if (oper == Operator.PreDecrement)
+
+ if (mode == Mode.PreDecrement)
ig.Emit (OpCodes.Sub);
else
ig.Emit (OpCodes.Add);
- ig.Emit (OpCodes.Dup);
- ((IStackStore) expr).Store (ec);
- } else {
- throw new Exception ("Handle Indexers and Properties here");
- }
+ } else
+ method.Emit (ec);
+
+ temp_storage.Store (ec);
+ ia.EmitAssign (ec, temp_storage);
+ if (is_expr)
+ temp_storage.Emit (ec);
break;
- case Operator.PostIncrement:
- case Operator.PostDecrement:
- eclass = expr.ExprClass;
- if (eclass == ExprClass.Variable){
- //
- // Resolve already verified that it is an "incrementable"
- //
+ case Mode.PostIncrement:
+ case Mode.PostDecrement:
+ if (is_expr)
expr.Emit (ec);
- ig.Emit (OpCodes.Dup);
+
+ if (method == null){
+ if (!is_expr)
+ expr.Emit (ec);
+ else
+ ig.Emit (OpCodes.Dup);
+
ig.Emit (OpCodes.Ldc_I4_1);
-
- if (oper == Operator.PostDecrement)
+
+ if (mode == Mode.PostDecrement)
ig.Emit (OpCodes.Sub);
else
ig.Emit (OpCodes.Add);
- ((IStackStore) expr).Store (ec);
- } else if (eclass == ExprClass.PropertyAccess){
- throw new Exception ("Handle Properties here");
- } else if (eclass == ExprClass.IndexerAccess) {
- throw new Exception ("Handle Indexers here");
} else {
- Console.WriteLine ("Unknown exprclass: " + eclass);
+ method.Emit (ec);
}
- break;
- default:
- throw new Exception ("This should not happen: Operator = "
- + oper.ToString ());
+ temp_storage.Store (ec);
+ ia.EmitAssign (ec, temp_storage);
+ break;
}
}
-
+ public override void Emit (EmitContext ec)
+ {
+ EmitCode (ec, true);
+
+ }
+
public override void EmitStatement (EmitContext ec)
{
- //
- // FIXME: we should rewrite this code to generate
- // better code for ++ and -- as we know we wont need
- // the values on the stack
- //
- Emit (ec);
- ec.ig.Emit (OpCodes.Pop);
+ EmitCode (ec, false);
}
+
}
public class Probe : Expression {
Expression expr;
Type probe_type;
- public enum Operator {
+ public enum Operator : byte {
Is, As
}
}
public class Binary : Expression {
- public enum Operator {
+ public enum Operator : byte {
Multiply, Division, Modulus,
Addition, Subtraction,
LeftShift, RightShift,
// Note that handling the case l == Decimal || r == Decimal
// is taken care of by the Step 1 Operator Overload resolution.
//
- void DoNumericPromotions (EmitContext ec, Type l, Type r)
+ bool DoNumericPromotions (EmitContext ec, Type l, Type r)
{
if (l == TypeManager.double_type || r == TypeManager.double_type){
//
Expression l_tmp, r_tmp;
l_tmp = ForceConversion (ec, left, TypeManager.int32_type);
- if (l_tmp == null) {
- error19 ();
- left = l_tmp;
- return;
- }
+ if (l_tmp == null)
+ return false;
r_tmp = ForceConversion (ec, right, TypeManager.int32_type);
- if (r_tmp == null) {
- error19 ();
- right = r_tmp;
- return;
- }
+ if (r_tmp == null)
+ return false;
+
+ left = l_tmp;
+ right = r_tmp;
type = TypeManager.int32_type;
}
+
+ return true;
}
void error19 ()
Arguments = new ArrayList ();
Arguments.Add (new Argument (left, Argument.AType.Expression));
Arguments.Add (new Argument (right, Argument.AType.Expression));
-
+
method = Invocation.OverloadResolve (ec, union, Arguments, loc);
if (method != null) {
MethodInfo mi = (MethodInfo) method;
//
if (l == TypeManager.string_type){
if (r == TypeManager.string_type){
+ if (left is Literal && right is Literal){
+ StringLiteral ls = (StringLiteral) left;
+ StringLiteral rs = (StringLiteral) right;
+
+ return new StringLiteral (ls.Value + rs.Value);
+ }
+
// string + string
method = TypeManager.string_concat_string_string;
} else {
return CheckShiftArguments (ec);
if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
- if (l != TypeManager.bool_type || r != TypeManager.bool_type)
+ if (l != TypeManager.bool_type || r != TypeManager.bool_type){
error19 ();
+ return null;
+ }
type = TypeManager.bool_type;
return this;
}
+ if (oper == Operator.Equality || oper == Operator.Inequality){
+ if (l == TypeManager.bool_type || r == TypeManager.bool_type){
+ if (r != TypeManager.bool_type || l != TypeManager.bool_type){
+ error19 ();
+ return null;
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ }
+
//
// We are dealing with numbers
//
- DoNumericPromotions (ec, l, r);
+ if (!DoNumericPromotions (ec, l, r)){
+ // Attempt:
+ //
+ // operator != (object a, object b)
+ // operator == (object a, object b)
+ //
+
+ if (oper == Operator.Equality || oper == Operator.Inequality){
+ Expression li, ri;
+ li = ConvertImplicit (ec, left, TypeManager.object_type, loc);
+ if (li != null){
+ ri = ConvertImplicit (ec, right, TypeManager.object_type,
+ loc);
+ if (ri != null){
+ left = li;
+ right = ri;
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+ }
+ }
+
+ error19 ();
+ return null;
+ }
if (left == null || right == null)
return null;
// Note that operators are static anyway
if (Arguments != null)
- Invocation.EmitArguments (ec, Arguments);
+ Invocation.EmitArguments (ec, method, Arguments);
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
ig.Emit (opcode);
}
+
+ // <summary>
+ // Constant expression reducer for binary operations
+ // </summary>
+ public override Expression Reduce (EmitContext ec)
+ {
+
+ left = left.Reduce (ec);
+ right = right.Reduce (ec);
+
+ if (!(left is Literal && right is Literal))
+ return this;
+
+ if (method == TypeManager.string_concat_string_string){
+ StringLiteral ls = (StringLiteral) left;
+ StringLiteral rs = (StringLiteral) right;
+
+ return new StringLiteral (ls.Value + rs.Value);
+ }
+
+ // FINISH ME.
+
+ return this;
+ }
}
public class Conditional : Expression {
if (expr == null || trueExpr == null || falseExpr == null)
return null;
-
+
if (trueExpr.Type == falseExpr.Type)
type = trueExpr.Type;
else {
}
}
+ if (expr is BoolLiteral){
+ BoolLiteral bl = (BoolLiteral) expr;
+
+ if (bl.Value)
+ return trueExpr;
+ else
+ return falseExpr;
+ }
+
eclass = ExprClass.Value;
return this;
}
falseExpr.Emit (ec);
ig.MarkLabel (end_target);
}
- }
-
- //
- // SimpleName expressions are initially formed of a single
- // word and it only happens at the beginning of the expression.
- //
- // The expression will try to be bound to a Field, a Method
- // group or a Property. If those fail we pass the name to our
- // caller and the SimpleName is compounded to perform a type
- // lookup. The idea behind this process is that we want to avoid
- // creating a namespace map from the assemblies, as that requires
- // the GetExportedTypes function to be called and a hashtable to
- // be constructed which reduces startup time. If later we find
- // that this is slower, we should create a `NamespaceExpr' expression
- // that fully participates in the resolution process.
- //
- // For example `System.Console.WriteLine' is decomposed into
- // MemberAccess (MemberAccess (SimpleName ("System"), "Console"), "WriteLine")
- //
- // The first SimpleName wont produce a match on its own, so it will
- // be turned into:
- // MemberAccess (SimpleName ("System.Console"), "WriteLine").
- //
- // System.Console will produce a TypeExpr match.
- //
- // The downside of this is that we might be hitting `LookupType' too many
- // times with this scheme.
- //
- public class SimpleName : Expression {
- public readonly string Name;
- public readonly Location Location;
-
- public SimpleName (string name, Location l)
- {
- Name = name;
- Location = l;
- }
-
- public static void Error120 (Location l, string name)
- {
- 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)
- {
- if (e is FieldExpr){
- FieldInfo fi = ((FieldExpr) e).FieldInfo;
-
- 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);
- return null;
- }
- }
- return e;
- }
-
- //
- // 7.5.2: Simple Names.
- //
- // Local Variables and Parameters are handled at
- // parse time, so they never occur as SimpleNames.
- //
- public override Expression DoResolve (EmitContext ec)
+ public override Expression Reduce (EmitContext ec)
{
- Expression e;
-
- //
- // Stage 1: Performed by the parser (binding to local or parameters).
- //
-
- //
- // Stage 2: Lookup members
- //
- e = MemberLookup (ec, ec.TypeContainer.TypeBuilder, Name, true, Location);
- if (e == null){
- //
- // Stage 3: Lookup symbol in the various namespaces.
- //
- Type t;
-
- if ((t = ec.TypeContainer.LookupType (Name, true)) != null)
- return new TypeExpr (t);
+ expr = expr.Reduce (ec);
+ trueExpr = trueExpr.Reduce (ec);
+ falseExpr = falseExpr.Reduce (ec);
- //
- // 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
- //
-
- // IMPLEMENT ME. Read mcs/mcs/TODO for ideas, or rewrite
- // using NamespaceExprs (dunno how that fixes the alias
- // per-file though).
-
- // No match, maybe our parent can compose us
- // into something meaningful.
- //
+ if (!(expr is Literal && trueExpr is Literal && falseExpr is Literal))
return this;
- }
-
- // Step 2, continues here.
- if (e is TypeExpr)
- return e;
- if (e is FieldExpr){
- FieldExpr fe = (FieldExpr) e;
-
- if (!fe.FieldInfo.IsStatic)
- fe.InstanceExpression = new This (Location.Null);
- }
+ BoolLiteral bl = (BoolLiteral) expr;
- if (ec.IsStatic)
- return MemberStaticCheck (e);
+ if (bl.Value)
+ return trueExpr;
else
- return e;
- }
-
- public override void Emit (EmitContext ec)
- {
- //
- // If this is ever reached, then we failed to
- // find the name as a namespace
- //
-
- Error (103, Location, "The name `" + Name +
- "' does not exist in the class `" +
- ec.TypeContainer.Name + "'");
+ return falseExpr;
}
}
-
- public class LocalVariableReference : Expression, IStackStore, IMemoryLocation {
+
+ public class LocalVariableReference : Expression, IAssignMethod, IMemoryLocation {
public readonly string Name;
public readonly Block Block;
break;
}
}
-
- public void Store (EmitContext ec)
+
+ public void EmitAssign (EmitContext ec, Expression source)
{
ILGenerator ig = ec.ig;
VariableInfo vi = VariableInfo;
vi.Assigned = true;
- // Funny seems the above generates optimal code for us, but
+ source.Emit (ec);
+
+ // Funny seems the code below generates optimal code for us, but
// seems to take too long to generate what we need.
// ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
Store (ig, vi.Idx);
}
-
+
public void AddressOf (EmitContext ec)
{
VariableInfo vi = VariableInfo;
}
}
- public class ParameterReference : Expression, IStackStore, IMemoryLocation {
+ public class ParameterReference : Expression, IAssignMethod, IMemoryLocation {
public readonly Parameters Pars;
public readonly String Name;
public readonly int Idx;
ec.ig.Emit (OpCodes.Ldarg, arg_idx);
}
- public void Store (EmitContext ec)
+ public void EmitAssign (EmitContext ec, Expression source)
{
+ source.Emit (ec);
+
if (arg_idx <= 255)
ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
else
// Used for arguments to New(), Invocation()
// </summary>
public class Argument {
- public enum AType {
+ public enum AType : byte {
Expression,
Ref,
Out
public readonly AType ArgType;
public Expression expr;
-
+
public Argument (Expression expr, AType type)
{
this.expr = expr;
public static string FullDesc (Argument a)
{
- StringBuilder sb = new StringBuilder ();
-
- if (a.ArgType == AType.Ref)
- sb.Append ("ref ");
-
- if (a.ArgType == AType.Out)
- sb.Append ("out ");
-
- sb.Append (TypeManager.CSharpName (a.Expr.Type));
-
- return sb.ToString ();
+ return (a.ArgType == AType.Ref ? "ref " :
+ (a.ArgType == AType.Out ? "out " : "")) +
+ TypeManager.CSharpName (a.Expr.Type);
}
- public bool Resolve (EmitContext ec)
+ public bool Resolve (EmitContext ec, Location loc)
{
expr = expr.Resolve (ec);
+ if (ArgType == AType.Expression)
+ return expr != null;
+
+ if (expr.ExprClass != ExprClass.Variable){
+ Report.Error (206, loc,
+ "A property or indexer can not be passed as an out or ref " +
+ "parameter");
+ return false;
+ }
+
return expr != null;
}
public void Emit (EmitContext ec)
{
- expr.Emit (ec);
+ if (ArgType == AType.Ref || ArgType == AType.Out)
+ ((IMemoryLocation)expr).AddressOf (ec);
+ else
+ expr.Emit (ec);
}
}
// </summary>
public class Invocation : ExpressionStatement {
public readonly ArrayList Arguments;
- public readonly Location Location;
+ Location loc;
Expression expr;
MethodBase method = null;
{
this.expr = expr;
Arguments = arguments;
- Location = l;
+ loc = l;
}
public Expression Expr {
argument_count = 0;
else
argument_count = Arguments.Count;
-
+
//
// Now we see if we can find params functions, applicable in their expanded form
// since if they were applicable in their normal form, they would have been selected
Expression conv;
if (use_standard)
- conv = ConvertImplicitStandard (ec, a_expr, parameter_type,
- Location.Null);
+ conv = ConvertImplicitStandard (ec, a_expr, parameter_type, Location.Null);
else
- conv = ConvertImplicit (ec, a_expr, parameter_type,
- Location.Null);
+ conv = ConvertImplicit (ec, a_expr, parameter_type, Location.Null);
if (conv == null) {
if (!Location.IsNull (loc)) {
bool IsDelegate = TypeManager.IsDelegateType (expr_type);
if (IsDelegate)
return (new DelegateInvocation (
- this.expr, Arguments, Location)).Resolve (ec);
+ this.expr, Arguments, loc)).Resolve (ec);
}
}
if (!(expr is MethodGroupExpr)){
- report118 (Location, this.expr, "method group");
+ report118 (loc, this.expr, "method group");
return null;
}
--i;
Argument a = (Argument) Arguments [i];
- if (!a.Resolve (ec))
+ if (!a.Resolve (ec, loc))
return null;
}
}
- method = OverloadResolve (ec, (MethodGroupExpr) this.expr, Arguments,
- Location);
+ method = OverloadResolve (ec, (MethodGroupExpr) this.expr, Arguments, loc);
if (method == null){
- Error (-6, Location,
+ Error (-6, loc,
"Could not find any applicable function for this argument list");
return null;
}
return this;
}
- public static void EmitArguments (EmitContext ec, ArrayList Arguments)
+ // <summary>
+ // Emits the list of arguments as an array
+ // </summary>
+ static void EmitParams (EmitContext ec, int idx, ArrayList arguments)
+ {
+ ILGenerator ig = ec.ig;
+ int count = arguments.Count - idx;
+ Argument a = (Argument) arguments [idx];
+ Type t = a.expr.Type;
+ string array_type = t.FullName + "[]";
+ LocalBuilder array;
+
+ array = ig.DeclareLocal (Type.GetType (array_type));
+ IntLiteral.EmitInt (ig, count);
+ ig.Emit (OpCodes.Newarr, t);
+ ig.Emit (OpCodes.Stloc, array);
+
+ int top = arguments.Count;
+ for (int j = idx; j < top; j++){
+ a = (Argument) arguments [j];
+
+ ig.Emit (OpCodes.Ldloc, array);
+ IntLiteral.EmitInt (ig, j - idx);
+ a.Emit (ec);
+
+ ArrayAccess.EmitStoreOpcode (ig, t);
+ }
+ ig.Emit (OpCodes.Ldloc, array);
+ }
+
+ // <summary>
+ // Emits a list of resolved Arguments that are in the arguments
+ // ArrayList.
+ //
+ // The MethodBase argument might be null if the
+ // emission of the arguments is known not to contain
+ // a `params' field (for example in constructors or other routines
+ // that keep their arguments in this structure
+ // </summary>
+
+ public static void EmitArguments (EmitContext ec, MethodBase mb, ArrayList arguments)
{
+ ParameterData pd = null;
int top;
- if (Arguments != null)
- top = Arguments.Count;
+ if (arguments != null)
+ top = arguments.Count;
else
top = 0;
+ if (mb != null)
+ pd = GetParameterData (mb);
+
for (int i = 0; i < top; i++){
- Argument a = (Argument) Arguments [i];
+ Argument a = (Argument) arguments [i];
+ if (pd != null){
+ if (pd.ParameterModifier (i) == Parameter.Modifier.PARAMS){
+ EmitParams (ec, i, arguments);
+ return;
+ }
+ }
+
a.Emit (ec);
}
}
Type t = instance_expr.Type;
instance_expr.Emit (ec);
- LocalBuilder temp = ec.GetTemporaryStorage (t);
+ LocalBuilder temp = ig.DeclareLocal (t);
ig.Emit (OpCodes.Stloc, temp);
ig.Emit (OpCodes.Ldloca, temp);
}
}
if (Arguments != null)
- EmitArguments (ec, Arguments);
+ EmitArguments (ec, method, Arguments);
if (is_static || struct_call){
if (method is MethodInfo)
public readonly ArrayList Arguments;
public readonly string RequestedType;
- Location Location;
+ Location loc;
MethodBase method = null;
//
//
Expression value_target;
- public New (string requested_type, ArrayList arguments, Location loc)
+ public New (string requested_type, ArrayList arguments, Location l)
{
RequestedType = requested_type;
Arguments = arguments;
- Location = loc;
+ loc = l;
}
public Expression ValueTypeVariable {
bool IsDelegate = TypeManager.IsDelegateType (type);
if (IsDelegate)
- return (new NewDelegate (type, Arguments, Location)).Resolve (ec);
+ return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
Expression ml;
ml = MemberLookup (ec, type, ".ctor", false,
- MemberTypes.Constructor, AllBindingsFlags, Location);
+ MemberTypes.Constructor, AllBindingsFlags, loc);
bool is_struct = false;
is_struct = type.IsSubclassOf (TypeManager.value_type);
if (! (ml is MethodGroupExpr)){
if (!is_struct){
- report118 (Location, ml, "method group");
+ report118 (loc, ml, "method group");
return null;
}
}
--i;
Argument a = (Argument) Arguments [i];
- if (!a.Resolve (ec))
+ if (!a.Resolve (ec, loc))
return null;
}
}
method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml,
- Arguments, Location);
+ Arguments, loc);
}
if (method == null && !is_struct) {
- Error (-6, Location,
+ Error (-6, loc,
"New invocation: Can not find a constructor for " +
"this argument list");
return null;
ml.AddressOf (ec);
} else {
- Invocation.EmitArguments (ec, Arguments);
+ Invocation.EmitArguments (ec, method, Arguments);
ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
return true;
}
string RequestedType;
string Rank;
ArrayList Initializers;
- Location Location;
+ Location loc;
ArrayList Arguments;
MethodBase method = null;
bool IsBuiltinType = false;
+ int dimensions = 0;
+
public ArrayCreation (string requested_type, ArrayList exprs,
string rank, ArrayList initializers, Location l)
{
RequestedType = requested_type;
Rank = rank;
Initializers = initializers;
- Location = l;
+ loc = l;
Arguments = new ArrayList ();
public ArrayCreation (string requested_type, string rank, ArrayList initializers, Location l)
{
RequestedType = requested_type;
- Rank = rank;
Initializers = initializers;
- Location = l;
+ loc = l;
+
+ Rank = rank.Substring (0, rank.LastIndexOf ("["));
+
+ string tmp = rank.Substring (rank.LastIndexOf ("["));
+
+ dimensions = tmp.Length - 1;
}
public static string FormArrayType (string base_type, int idx_count, string rank)
return val.Substring (0, val.LastIndexOf ("["));
}
+
+ void error178 ()
+ {
+ Report.Error (178, loc, "Incorrectly structured array initializer");
+ }
+
+ bool ValidateInitializers (EmitContext ec)
+ {
+ if (Initializers == null)
+ return true;
+
+ Type underlying_type = ec.TypeContainer.LookupType (RequestedType, false);
+
+ ArrayList probe = Initializers;
+
+ if (Arguments != null) {
+ for (int i = 0; i < Arguments.Count; i++) {
+ Argument a = (Argument) Arguments [i];
+
+ Expression e = Expression.Reduce (ec, a.Expr);
+
+ if (!(e is Literal)) {
+ Report.Error (150, loc, "A constant value is expected");
+ return false;
+ }
+
+ int value = (int) ((Literal) e).GetValue ();
+ if (probe == null) {
+ error178 ();
+ return false;
+ }
+
+ if (value != probe.Count) {
+ error178 ();
+ return false;
+ }
+
+ if (probe [0] is ArrayList)
+ probe = (ArrayList) probe [0];
+ else {
+ for (int j = 0; j < probe.Count; ++j) {
+ Expression tmp = (Expression) probe [j];
+
+ tmp = tmp.Resolve (ec);
+
+ Expression conv = ConvertImplicitRequired (ec, tmp,
+ underlying_type, loc);
+
+ if (conv == null)
+ return false;
+ }
+
+ probe = null;
+ }
+ }
+
+ } else {
+ //
+ // Here is where we update dimension info in the case
+ // that the user skips doing that
+ //
+
+ Arguments = new ArrayList ();
+
+ for (probe = Initializers; probe != null; ) {
+ Expression e = new IntLiteral (probe.Count);
+
+ Arguments.Add (new Argument (e, Argument.AType.Expression));
+
+ if (probe [0] is ArrayList)
+ probe = (ArrayList) probe [0];
+ else {
+ for (int j = 0; j < probe.Count; ++j) {
+ Expression tmp = (Expression) probe [j];
+
+ tmp = tmp.Resolve (ec);
+
+ Expression conv = ConvertImplicitRequired (ec, tmp,
+ underlying_type, loc);
+
+ if (conv == null)
+ return false;
+ }
+
+ probe = null;
+ }
+ }
+
+ if (Arguments.Count != dimensions) {
+ error178 ();
+ return false;
+ }
+ }
+ return true;
+ }
+
public override Expression DoResolve (EmitContext ec)
{
int arg_count;
-
+
+ if (!ValidateInitializers (ec))
+ return null;
+
if (Arguments == null)
arg_count = 0;
else
Expression ml;
ml = MemberLookup (ec, type, ".ctor", false, MemberTypes.Constructor,
- AllBindingsFlags, Location);
+ AllBindingsFlags, loc);
if (!(ml is MethodGroupExpr)){
- report118 (Location, ml, "method group");
+ report118 (loc, ml, "method group");
return null;
}
if (ml == null) {
- Report.Error (-6, Location, "New invocation: Can not find a constructor for " +
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
--i;
Argument a = (Argument) Arguments [i];
- if (!a.Resolve (ec))
+ if (!a.Resolve (ec, loc))
return null;
}
}
- method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml, Arguments, Location);
+ method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml, Arguments, loc);
if (method == null) {
- Report.Error (-6, Location, "New invocation: Can not find a constructor for " +
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
--i;
Argument a = (Argument) Arguments [i];
- if (!a.Resolve (ec))
+ if (!a.Resolve (ec, loc))
return null;
args.Add (a.Type);
arg_types);
if (method == null) {
- Report.Error (-6, Location, "New invocation: Can not find a constructor for " +
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
public override void Emit (EmitContext ec)
{
+ ILGenerator ig = ec.ig;
+
if (IsOneDimensional) {
- Invocation.EmitArguments (ec, Arguments);
- ec.ig.Emit (OpCodes.Newarr, array_element_type);
+ Invocation.EmitArguments (ec, null, Arguments);
+ ig.Emit (OpCodes.Newarr, array_element_type);
+
+ } else {
+ Invocation.EmitArguments (ec, null, Arguments);
+
+ if (IsBuiltinType)
+ ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
+ else
+ ig.Emit (OpCodes.Newobj, (MethodInfo) method);
+ }
+
+ if (Initializers != null){
+ FieldBuilder fb;
+
+ // FIXME: This is just sample data, need to fill with
+ // real values.
+ byte [] a = new byte [4] { 1, 2, 3, 4 };
- } else {
- Invocation.EmitArguments (ec, Arguments);
+ fb = ec.TypeContainer.RootContext.MakeStaticData (a);
- if (IsBuiltinType)
- ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
- else
- ec.ig.Emit (OpCodes.Newobj, (MethodInfo) method);
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Ldtoken, fb);
+ ig.Emit (OpCodes.Call, TypeManager.void_initializearray_array_fieldhandle);
}
-
}
public override void EmitStatement (EmitContext ec)
//
// Represents the `this' construct
//
- public class This : Expression, IStackStore, IMemoryLocation {
+ public class This : Expression, IAssignMethod, IMemoryLocation {
Location loc;
public This (Location loc)
ec.ig.Emit (OpCodes.Ldarg_0);
}
- public void Store (EmitContext ec)
+ public void EmitAssign (EmitContext ec, Expression source)
{
+ source.Emit (ec);
ec.ig.Emit (OpCodes.Starg, 0);
}
public SizeOf (string queried_type)
{
- this.QueriedType = queried_type;
- }
-
- public override Expression DoResolve (EmitContext ec)
- {
- // FIXME: Implement;
- throw new Exception ("Unimplemented");
- // return this;
- }
-
- public override void Emit (EmitContext ec)
- {
- throw new Exception ("Implement me");
- }
- }
-
- public class MemberAccess : Expression {
- public readonly string Identifier;
- Expression expr;
- Expression member_lookup;
- Location loc;
-
- public MemberAccess (Expression expr, string id, Location l)
- {
- this.expr = expr;
- Identifier = id;
- loc = l;
- }
-
- public Expression Expr {
- get {
- return expr;
- }
- }
-
- void error176 (Location loc, string name)
- {
- Report.Error (176, loc, "Static member `" +
- name + "' cannot be accessed " +
- "with an instance reference, qualify with a " +
- "type name instead");
- }
-
- public override Expression DoResolve (EmitContext ec)
- {
- //
- // We are the sole users of ResolveWithSimpleName (ie, the only
- // ones that can cope with it
- //
- expr = expr.ResolveWithSimpleName (ec);
-
- if (expr == null)
- return null;
-
- if (expr is SimpleName){
- SimpleName child_expr = (SimpleName) expr;
-
- expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
-
- return expr.Resolve (ec);
- }
-
- member_lookup = MemberLookup (ec, expr.Type, Identifier, false, loc);
-
- if (member_lookup == null)
- return null;
-
- //
- // Method Groups
- //
- if (member_lookup is MethodGroupExpr){
- MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
-
- //
- // Type.MethodGroup
- //
- if (expr is TypeExpr){
- if (!mg.RemoveInstanceMethods ()){
- SimpleName.Error120 (loc, mg.Methods [0].Name);
- return null;
- }
-
- return member_lookup;
- }
-
- //
- // Instance.MethodGroup
- //
- if (!mg.RemoveStaticMethods ()){
- error176 (loc, mg.Methods [0].Name);
- return null;
- }
-
- mg.InstanceExpression = expr;
-
- return member_lookup;
- }
-
- if (member_lookup is FieldExpr){
- FieldExpr fe = (FieldExpr) member_lookup;
-
- if (expr is TypeExpr){
- if (!fe.FieldInfo.IsStatic){
- error176 (loc, fe.FieldInfo.Name);
- return null;
- }
- return member_lookup;
- } else {
- if (fe.FieldInfo.IsStatic){
- error176 (loc, fe.FieldInfo.Name);
- return null;
- }
- fe.InstanceExpression = expr;
-
- return fe;
- }
- }
-
- if (member_lookup is PropertyExpr){
- PropertyExpr pe = (PropertyExpr) member_lookup;
-
- if (expr is TypeExpr){
- if (!pe.IsStatic){
- SimpleName.Error120 (loc, pe.PropertyInfo.Name);
- return null;
- }
- return pe;
- } else {
- if (pe.IsStatic){
- error176 (loc, pe.PropertyInfo.Name);
- return null;
- }
- pe.InstanceExpression = expr;
-
- return pe;
- }
- }
-
- Console.WriteLine ("Support for [" + member_lookup + "] is not present yet");
- Environment.Exit (0);
- return null;
- }
-
- public override void Emit (EmitContext ec)
- {
- throw new Exception ("Should not happen I think");
- }
-
- }
-
- // <summary>
- // Fully resolved expression that evaluates to a type
- // </summary>
- public class TypeExpr : Expression {
- public TypeExpr (Type t)
- {
- Type = t;
- eclass = ExprClass.Type;
- }
-
- override public Expression DoResolve (EmitContext ec)
- {
- return this;
- }
-
- override public void Emit (EmitContext ec)
- {
- throw new Exception ("Implement me");
- }
- }
-
- // <summary>
- // MethodGroup Expression.
- //
- // This is a fully resolved expression that evaluates to a type
- // </summary>
- public class MethodGroupExpr : Expression {
- public MethodBase [] Methods;
- Expression instance_expression = null;
-
- public MethodGroupExpr (MemberInfo [] mi)
- {
- Methods = new MethodBase [mi.Length];
- mi.CopyTo (Methods, 0);
- eclass = ExprClass.MethodGroup;
- }
-
- public MethodGroupExpr (ArrayList l)
- {
- Methods = new MethodBase [l.Count];
-
- l.CopyTo (Methods, 0);
- eclass = ExprClass.MethodGroup;
- }
-
- //
- // `A method group may have associated an instance expression'
- //
- public Expression InstanceExpression {
- get {
- return instance_expression;
- }
-
- set {
- instance_expression = value;
- }
- }
-
- override public Expression DoResolve (EmitContext ec)
- {
- return this;
- }
-
- override public void Emit (EmitContext ec)
- {
- throw new Exception ("This should never be reached");
- }
-
- 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];
-
- if (mb.IsStatic == keep_static)
- smethods.Add (mb);
- }
-
- if (smethods.Count == 0)
- return false;
-
- Methods = new MethodBase [smethods.Count];
- smethods.CopyTo (Methods, 0);
-
- return true;
- }
-
- // <summary>
- // Removes any instance methods from the MethodGroup, returns
- // false if the resulting set is empty.
- // </summary>
- public bool RemoveInstanceMethods ()
- {
- return RemoveMethods (true);
- }
-
- // <summary>
- // Removes any static methods from the MethodGroup, returns
- // false if the resulting set is empty.
- // </summary>
- public bool RemoveStaticMethods ()
- {
- return RemoveMethods (false);
- }
- }
-
- // <summary>
- // Fully resolved expression that evaluates to a Field
- // </summary>
- public class FieldExpr : Expression, IStackStore, IMemoryLocation {
- public readonly FieldInfo FieldInfo;
- public Expression InstanceExpression;
- Location loc;
-
- public FieldExpr (FieldInfo fi, Location l)
- {
- FieldInfo = fi;
- eclass = ExprClass.Variable;
- type = fi.FieldType;
- loc = l;
- }
-
- 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");
- }
-
- InstanceExpression = InstanceExpression.Resolve (ec);
- if (InstanceExpression == null)
- return null;
-
- }
- return this;
- }
-
- public Expression DoResolveLValue (EmitContext ec)
- {
- if (!FieldInfo.IsInitOnly)
- return this;
-
- //
- // InitOnly fields can only be assigned in constructors
- //
-
- if (ec.IsConstructor)
- return this;
-
- Report.Error (191, loc,
- "Readonly field can not be assigned outside " +
- "of constructor or variable initializer");
-
- return null;
- }
-
- override public void Emit (EmitContext ec)
- {
- ILGenerator ig = ec.ig;
-
- if (FieldInfo.IsStatic)
- ig.Emit (OpCodes.Ldsfld, FieldInfo);
- else {
- InstanceExpression.Emit (ec);
-
- ig.Emit (OpCodes.Ldfld, FieldInfo);
- }
+ this.QueriedType = queried_type;
}
- public void Store (EmitContext ec)
+ public override Expression DoResolve (EmitContext ec)
{
- if (FieldInfo.IsStatic)
- ec.ig.Emit (OpCodes.Stsfld, FieldInfo);
- else
- ec.ig.Emit (OpCodes.Stfld, FieldInfo);
+ // FIXME: Implement;
+ throw new Exception ("Unimplemented");
+ // return this;
}
- public void AddressOf (EmitContext ec)
+ public override void Emit (EmitContext ec)
{
- if (FieldInfo.IsStatic)
- ec.ig.Emit (OpCodes.Ldsflda, FieldInfo);
- else {
- InstanceExpression.Emit (ec);
- ec.ig.Emit (OpCodes.Ldflda, FieldInfo);
- }
+ throw new Exception ("Implement me");
}
}
-
- // <summary>
- // Expression that evaluates to a Property. The Assign class
- // might set the `Value' expression if we are in an assignment.
- //
- // 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 readonly PropertyInfo PropertyInfo;
- public readonly bool IsStatic;
- MethodInfo [] Accessors;
+
+ public class MemberAccess : Expression {
+ public readonly string Identifier;
+ Expression expr;
+ Expression member_lookup;
Location loc;
- Expression instance_expr;
-
- public PropertyExpr (PropertyInfo pi, Location l)
+ public MemberAccess (Expression expr, string id, Location l)
{
- PropertyInfo = pi;
- eclass = ExprClass.PropertyAccess;
- IsStatic = false;
+ this.expr = expr;
+ Identifier = id;
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;
}
- //
- // The instance expression associated with this expression
- //
- public Expression InstanceExpression {
- set {
- instance_expr = value;
- }
-
+ public Expression Expr {
get {
- return instance_expr;
+ return expr;
}
}
- public bool VerifyAssignable ()
+ void error176 (Location loc, string name)
{
- if (!PropertyInfo.CanWrite){
- Report.Error (200, loc,
- "The property `" + PropertyInfo.Name +
- "' can not be assigned to, as it has not set accessor");
- return false;
- }
-
- return true;
+ Report.Error (176, loc, "Static member `" +
+ name + "' cannot be accessed " +
+ "with an instance reference, qualify with a " +
+ "type name instead");
}
-
- override public Expression DoResolve (EmitContext ec)
+
+ public override Expression DoResolve (EmitContext ec)
{
- if (!PropertyInfo.CanRead){
- Report.Error (154, loc,
- "The property `" + PropertyInfo.Name +
- "' can not be used in " +
- "this context because it lacks a get accessor");
+ //
+ // We are the sole users of ResolveWithSimpleName (ie, the only
+ // ones that can cope with it
+ //
+ expr = expr.ResolveWithSimpleName (ec);
+
+ if (expr == null)
return null;
- }
- return this;
- }
+ if (expr is SimpleName){
+ SimpleName child_expr = (SimpleName) expr;
- override public void Emit (EmitContext ec)
- {
- Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [0], null);
+ expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
+
+ return expr.Resolve (ec);
+ }
+
+ member_lookup = MemberLookup (ec, expr.Type, Identifier, false, loc);
+
+ if (member_lookup == null)
+ return null;
- }
+ //
+ // Method Groups
+ //
+ if (member_lookup is MethodGroupExpr){
+ MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
+
+ //
+ // Type.MethodGroup
+ //
+ if (expr is TypeExpr){
+ if (!mg.RemoveInstanceMethods ()){
+ SimpleName.Error120 (loc, mg.Methods [0].Name);
+ return null;
+ }
- //
- // Implements the IAssignMethod interface for assignments
- //
- public void EmitAssign (EmitContext ec, Expression source)
- {
- Argument arg = new Argument (source, Argument.AType.Expression);
- ArrayList args = new ArrayList ();
+ return member_lookup;
+ }
- args.Add (arg);
- Invocation.EmitCall (ec, IsStatic, instance_expr, Accessors [1], args);
- }
+ //
+ // Instance.MethodGroup
+ //
+ if (!mg.RemoveStaticMethods ()){
+ error176 (loc, mg.Methods [0].Name);
+ return null;
+ }
+
+ mg.InstanceExpression = expr;
+
+ return member_lookup;
+ }
- override public void EmitStatement (EmitContext ec)
- {
- Emit (ec);
- ec.ig.Emit (OpCodes.Pop);
- }
- }
+ if (member_lookup is FieldExpr){
+ FieldExpr fe = (FieldExpr) member_lookup;
+ FieldInfo fi = fe.FieldInfo;
- // <summary>
- // Fully resolved expression that evaluates to a Expression
- // </summary>
- public class EventExpr : Expression {
- public readonly EventInfo EventInfo;
- Location loc;
-
- public EventExpr (EventInfo ei, Location loc)
- {
- EventInfo = ei;
- this.loc = loc;
- eclass = ExprClass.EventAccess;
- }
+ if (fi.IsLiteral) {
+ Type t = fi.FieldType;
+ object o;
- override public Expression DoResolve (EmitContext ec)
- {
- // We are born in resolved state.
- return this;
+ if (fi is FieldBuilder)
+ o = TypeManager.GetValue ((FieldBuilder) fi);
+ else
+ o = fi.GetValue (fi);
+
+ if (t.IsSubclassOf (TypeManager.enum_type)) {
+ Expression enum_member = MemberLookup (ec, t, "value__", false, loc);
+ Type underlying_type = enum_member.Type;
+
+ Expression e = Literalize (o, underlying_type);
+ e.Resolve (ec);
+
+ return new EnumLiteral (e, t);
+ }
+
+ Expression exp = Literalize (o, t);
+ exp.Resolve (ec);
+
+ return exp;
+ }
+
+ if (expr is TypeExpr){
+ if (!fe.FieldInfo.IsStatic){
+ error176 (loc, fe.FieldInfo.Name);
+ return null;
+ }
+ return member_lookup;
+ } else {
+ if (fe.FieldInfo.IsStatic){
+ error176 (loc, fe.FieldInfo.Name);
+ return null;
+ }
+ fe.InstanceExpression = expr;
+
+ return fe;
+ }
+ }
+
+ if (member_lookup is PropertyExpr){
+ PropertyExpr pe = (PropertyExpr) member_lookup;
+
+ if (expr is TypeExpr){
+ if (!pe.IsStatic){
+ SimpleName.Error120 (loc, pe.PropertyInfo.Name);
+ return null;
+ }
+ return pe;
+ } else {
+ if (pe.IsStatic){
+ error176 (loc, pe.PropertyInfo.Name);
+ return null;
+ }
+ pe.InstanceExpression = expr;
+
+ return pe;
+ }
+ }
+
+ Console.WriteLine ("Support for [" + member_lookup + "] is not present yet");
+ Environment.Exit (0);
+ return null;
}
- override public void Emit (EmitContext ec)
+ public override void Emit (EmitContext ec)
{
- throw new Exception ("Implement me");
- // FIXME: Implement.
+ throw new Exception ("Should not happen I think");
}
+
}
-
+
public class CheckedExpr : Expression {
public Expression Expr;
}
public class ElementAccess : Expression {
-
public ArrayList Arguments;
public Expression Expr;
public Location loc;
--i;
Argument a = (Argument) Arguments [i];
- if (!a.Resolve (ec))
+ if (!a.Resolve (ec, loc))
return false;
}
//
// I am experimenting with this pattern.
//
- if (Expr.Type == TypeManager.array_type)
+ if (Expr.Type.IsSubclassOf (TypeManager.array_type))
return (new ArrayAccess (this)).Resolve (ec);
else
return (new IndexerAccess (this)).Resolve (ec);
if (!CommonResolve (ec))
return null;
- if (Expr.Type == TypeManager.array_type)
+ if (Expr.Type.IsSubclassOf (TypeManager.array_type))
return (new ArrayAccess (this)).ResolveLValue (ec, right_side);
else
return (new IndexerAccess (this)).ResolveLValue (ec, right_side);
}
}
- public class ArrayAccess : Expression, IStackStore {
+ //
+ // Implements array access
+ //
+ public class ArrayAccess : Expression, IAssignMethod {
//
// Points to our "data" repository
//
{
ea = ea_data;
eclass = ExprClass.Variable;
-
- //
- // FIXME: Figure out the type here
- //
}
- Expression CommonResolve (EmitContext ec)
- {
- return this;
- }
-
public override Expression DoResolve (EmitContext ec)
{
if (ea.Expr.ExprClass != ExprClass.Variable) {
report118 (ea.loc, ea.Expr, "variable");
return null;
}
-
- throw new Exception ("Implement me");
+
+ Type t = ea.Expr.Type;
+
+ if (t.GetArrayRank () != ea.Arguments.Count){
+ Report.Error (22, ea.loc,
+ "Incorrect number of indexes for array " +
+ " expected: " + t.GetArrayRank () + " got: " +
+ ea.Arguments.Count);
+ return null;
+ }
+ type = t.GetElementType ();
+ eclass = ExprClass.Variable;
+
+ return this;
}
- public void Store (EmitContext ec)
- {
- throw new Exception ("Implement me !");
+ // <summary>
+ // Emits the right opcode to load an object of Type `t'
+ // from an array of T
+ // </summary>
+ static public void EmitLoadOpcode (ILGenerator ig, Type type)
+ {
+ if (type == TypeManager.byte_type)
+ ig.Emit (OpCodes.Ldelem_I1);
+ else if (type == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Ldelem_U1);
+ else if (type == TypeManager.short_type)
+ ig.Emit (OpCodes.Ldelem_I2);
+ else if (type == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Ldelem_U2);
+ else if (type == TypeManager.int32_type)
+ ig.Emit (OpCodes.Ldelem_I4);
+ else if (type == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Ldelem_U4);
+ else if (type == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.int64_type)
+ ig.Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.float_type)
+ ig.Emit (OpCodes.Ldelem_R4);
+ else if (type == TypeManager.double_type)
+ ig.Emit (OpCodes.Ldelem_R8);
+ else if (type == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Ldelem_I);
+ else
+ ig.Emit (OpCodes.Ldelem_Ref);
}
+ // <summary>
+ // Emits the right opcode to store an object of Type `t'
+ // from an array of T.
+ // </summary>
+ static public void EmitStoreOpcode (ILGenerator ig, Type t)
+ {
+ if (t == TypeManager.byte_type || t == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Stelem_I1);
+ else if (t == TypeManager.short_type || t == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Stelem_I2);
+ else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Stelem_I4);
+ else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Stelem_I8);
+ else if (t == TypeManager.float_type)
+ ig.Emit (OpCodes.Stelem_R4);
+ else if (t == TypeManager.double_type)
+ ig.Emit (OpCodes.Stelem_R8);
+ else if (t == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Stelem_I);
+ else
+ ig.Emit (OpCodes.Stelem_Ref);
+ }
+
public override void Emit (EmitContext ec)
{
- throw new Exception ("Implement me !");
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+
+ foreach (Argument a in ea.Arguments)
+ a.Expr.Emit (ec);
+
+ if (rank == 1)
+ EmitLoadOpcode (ig, type);
+ else {
+ ModuleBuilder mb = ec.TypeContainer.RootContext.ModuleBuilder;
+ Type [] args = new Type [ea.Arguments.Count];
+ MethodInfo get;
+
+ int i = 0;
+
+ foreach (Argument a in ea.Arguments)
+ args [i++] = a.Type;
+
+ get = mb.GetArrayMethod (
+ ea.Expr.Type, "Get",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ type, args);
+
+ ig.Emit (OpCodes.Call, get);
+ }
}
- }
+ public void EmitAssign (EmitContext ec, Expression source)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+
+ foreach (Argument a in ea.Arguments)
+ a.Expr.Emit (ec);
+
+ source.Emit (ec);
+
+ Type t = source.Type;
+ if (rank == 1)
+ EmitStoreOpcode (ig, t);
+ else {
+ ModuleBuilder mb = ec.TypeContainer.RootContext.ModuleBuilder;
+ Type [] args = new Type [ea.Arguments.Count + 1];
+ MethodInfo set;
+
+ int i = 0;
+
+ foreach (Argument a in ea.Arguments)
+ args [i++] = a.Type;
+
+ args [i] = type;
+
+ set = mb.GetArrayMethod (
+ ea.Expr.Type, "Set",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ TypeManager.void_type, args);
+
+ ig.Emit (OpCodes.Call, set);
+ }
+ }
+ }
class Indexers {
public ArrayList getters, setters;
static Hashtable map;
return ix;
}
}
-
+
+ // <summary>
+ // Expressions that represent an indexer call.
+ // </summary>
public class IndexerAccess : Expression, IAssignMethod {
//
// Points to our "data" repository
eclass = ExprClass.Value;
}
- public bool VerifyAssignable (Expression source)
- {
- throw new Exception ("Implement me!");
- }
-
public override Expression DoResolve (EmitContext ec)
{
Type indexer_type = ea.Expr.Type;
if (ilist == null)
ilist = Indexers.GetIndexersForType (
indexer_type, ec.TypeContainer.RootContext.TypeManager, ea.loc);
-
+
+
+ //
+ // Step 2: find the proper match
+ //
if (ilist != null && ilist.getters != null && ilist.getters.Count > 0)
get = (MethodInfo) Invocation.OverloadResolve (
ec, new MethodGroupExpr (ilist.getters), ea.Arguments, ea.loc);
Report.Error (154, ea.loc,
"indexer can not be used in this context, because " +
"it lacks a `get' accessor");
- return null;
+ return null;
}
-
+
type = get.ReturnType;
- eclass = ExprClass.Value;
+ eclass = ExprClass.IndexerAccess;
return this;
}
public class BaseAccess : Expression {
- public enum BaseAccessType {
+ public enum BaseAccessType : byte {
Member,
Indexer
};
eclass = ExprClass.Value;
}
+ public EmptyExpression (Type t)
+ {
+ type = t;
+ eclass = ExprClass.Value;
+ }
+
public override Expression DoResolve (EmitContext ec)
{
return this;
projects / mono.git / blobdiff