2001-09-28 Miguel de Icaza <miguel@ximian.com>

[mono.git] / mcs / mcs / ChangeLog

2001-09-28  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Probe::Emit): Is needs to do an isinst and then
        compare against null.

        (::CanConvert): Added Location argument.  If the Location argument
        is null (Location.Null), then we do not report errors.  This is
        used by the `probe' mechanism of the Explicit conversion.  We do
        not want to generate an error for something that the user
        explicitly requested to be casted.  But the pipeline for an
        explicit cast first tests for potential implicit casts.

        So for now, if the Location is null, it means `Probe only' to
        avoid adding another argument.   Might have to revise this
        strategy later.

        (ClassCast): New class used to type cast objects into arbitrary
        classes (used in Explicit Reference Conversions).

        Implement `as' as well.

        Reverted all the patches from Ravi below: they were broken:

                * The use of `level' as a mechanism to stop recursive
                  invocations is wrong.  That was there just to catch the
                  bug with a strack trace but not as a way of addressing
                  the problem.

                  To fix the problem we have to *understand* what is going
                  on and the interactions and come up with a plan, not
                  just get things going.

                * The use of the type conversion cache that I proposed
                  last night had an open topic: How does this work across
                  protection domains.  A user defined conversion might not
                  be public in the location where we are applying the
                  conversion, a different conversion might be selected
                  (ie, private A->B (better) but public B->A (worse),
                  inside A, A->B applies, but outside it, B->A will
                  apply).

                * On top of that (ie, even if the above is solved),
                  conversions in a cache need to be abstract.  Ie, `To
                  convert from an Int to a Short use an OpcodeCast', not
                  `To convert from an Int to a Short use the OpcodeCast on
                  the variable 5' (which is what this patch was doing).
        
2001-09-28  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Invocation::ConversionExists): Re-write to use
        the conversion cache
        
        (Expression::ConvertImplicit): Automatic bailing out if level != 0. Also
        cache all conversions done, not just user-defined ones.

        (Invocation::BetterConversion): The real culprit. Use ConversionExists
        to determine if a conversion exists instead of acutually trying to 
        perform the conversion. It's faster too.

        (Expression::ConvertExplicit): Modify to use ConversionExists to check
        and only then attempt the implicit conversion.

2001-09-28  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ConvertImplicit): Use a cache for conversions
        already found. Check level of recursion and bail out if necessary.
        
2001-09-28  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (string_concat_string_string, string_concat_object_object):
        Export standard methods that we expect for string operations.
        
        * statement.cs (Block::UsageWarning): Track usage of variables and
        report the errors for not used variables.

        * expression.cs (Conditional::Resolve, ::Emit): Implement ?:
        operator. 

2001-09-27  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs: remove unnneded code 

        * expression.cs: Removed BuiltinTypeAccess class

        Fix the order in which implicit conversions are
        done.  

        The previous fixed dropped support for boxed conversions (adding a
        test to the test suite now)

        (UserImplicitCast::CanConvert): Remove test for source being null,
        that code is broken.  We should not feed a null to begin with, if
        we do, then we should track the bug where the problem originates
        and not try to cover it up here.

        Return a resolved expression of type UserImplicitCast on success
        rather than true/false.  Ravi: this is what I was talking about,
        the pattern is to use a static method as a "constructor" for
        objects. 

        Also, do not create arguments until the very last minute,
        otherwise we always create the arguments even for lookups that
        will never be performed. 

        (UserImplicitCast::Resolve): Eliminate, objects of type
        UserImplicitCast are born in a fully resolved state. 
        
        * typemanager.cs (InitCoreTypes): Init also value_type
        (System.ValueType). 

        * expression.cs (Cast::Resolve): First resolve the child expression.

        (LValue): Add new method AddressOf to be used by
        the `&' operator.  

        Change the argument of Store to take an EmitContext instead of an
        ILGenerator, because things like FieldExpr need to be able to call
        their children expression to generate the instance code. 

        (Expression::Error, Expression::Warning): Sugar functions for
        reporting errors.

        (Expression::MemberLookup): Accept a TypeContainer instead of a
        Report as the first argument.

        (Expression::ResolvePrimary): Killed.  I still want to improve
        this as currently the code is just not right.

        (Expression::ResolveMemberAccess): Simplify, but it is still
        wrong. 

        (Unary::Resolve): Catch errors in AddressOf operators.

        (LocalVariableReference::Emit, ::Store, ::AddressOf): typecast
        index to a byte for the short-version, or the compiler will choose
        the wrong Emit call, which generates the wrong data.

        (ParameterReference::Emit, ::Store): same.

        (FieldExpr::AddressOf): Implement.
        
        * typemanager.cs: TypeManager: made public variable instead of
        property.
        
        * driver.cs: document --fatal.

        * report.cs (ErrorMessage, WarningMessage): new names for the old
        Error and Warning classes.

        * cs-parser.jay (member_access): Turn built-in access to types
        into a normal simplename

2001-09-27  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Invocation::BetterConversion): Fix to cope
        with q being null, since this was introducing a bug.

        * expression.cs (ConvertImplicit): Do built-in conversions first.

2001-09-27  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (UserImplicitCast::Resolve): Fix bug.

2001-09-27  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::AddConstructor): Fix a stupid bug
        I had introduced long ago (what's new ?).

        * expression.cs (UserImplicitCast::CanConvert): Static method to do 
        the work of all the checking. 
        (ConvertImplicit): Call CanConvert and only then create object if necessary.
        (UserImplicitCast::CanConvert, ::Resolve): Re-write.

        (Unary::Operator): Rename Add and Subtract to Addition and Subtraction because
        that is the right way. 

        (Invocation::MakeUnionSet): Convenience function to make unions of sets for 
        overloading resolution. Use everywhere instead of cutting and pasting code.

        (Binary::ResolveOperator): Use MakeUnionSet.

        (UserImplicitCast::CanConvert, ::Resolve): Update to take care of the case when 
        we have to convert to bool types. Not complete yet.
        
2001-09-27  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (TypeManager::CSharpName): support ushort.

        * expression.cs (Expression::TryImplicitIntConversion): Attempts
        to provide an expression that performsn an implicit constant int
        conversion (section 6.1.6).
        (Expression::ConvertImplicitRequired): Reworked to include
        implicit constant expression conversions.

        (Expression::ConvertNumericExplicit): Finished.

        (Invocation::Emit): If InstanceExpression is null, then it means
        that we perform a call on this.
        
2001-09-26  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Unary::Emit): Remove some dead code.
        (Probe): Implement Resolve and Emit for `is'.
        (Expression::ConvertImplicitRequired): Attempt to do constant
        expression conversions here.  Maybe should be moved to
        ConvertImplicit, but I am not sure.
        (Expression::ImplicitLongConstantConversionPossible,
        Expression::ImplicitIntConstantConversionPossible): New functions
        that tell whether is it possible to apply an implicit constant
        expression conversion.

        (ConvertNumericExplicit): Started work on explicit numeric
        conversions.

        * cs-parser.jay: Update operator constants.

        * parameter.cs (Parameters::GetParameterInfo): Hook up VerifyArgs
        (Parameters::GetSignature): Hook up VerifyArgs here.
        (Parameters::VerifyArgs): Verifies that no two arguments have the
        same name. 

        * class.cs (Operator): Update the operator names to reflect the
        ones that the spec expects (as we are just stringizing the
        operator names).
        
        * expression.cs (Unary::ResolveOperator): Fix bug: Use
        MethodInfo's ReturnType instead of LookupMethodByBuilder as the
        previous usage did only work for our methods.
        (Expression::ConvertImplicit): Handle decimal implicit numeric
        conversions as well.
        (Expression::InternalTypeConstructor): Used to invoke constructors
        on internal types for default promotions.

        (Unary::Emit): Implement special handling for the pre/post
        increment/decrement for overloaded operators, as they need to have
        the same semantics as the other operators.

        (Binary::ResolveOperator): ditto.
        (Invocation::ConversionExists): ditto.
        (UserImplicitCast::Resolve): ditto.
        
2001-09-26  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Unary::Emit and Binary::Emit): If we have an overloaded
        operator, return after emitting body. Regression tests pass again !

        * expression.cs (ConvertImplicit): Take TypeContainer as first argument
        (Unary::ForceConversion, Binary::ForceConversion): Ditto.
        (Invocation::OverloadResolve): Ditto.
        (Invocation::BetterFunction, BetterConversion, ConversionExists): Ditto.

        * everywhere : update calls to the above methods accordingly.

2001-09-26  Miguel de Icaza  <miguel@ximian.com>

        * assign.cs (Assign): Make it inherit from ExpressionStatement.

        * expression.cs (ExpressionStatement): New base class used for
        expressions that can appear in statements, so that we can provide
        an alternate path to generate expression that do not leave a value
        on the stack.

        (Expression::Emit, and all the derivatives): We no longer return
        whether a value is left on the stack or not.  Every expression
        after being emitted leaves a single value on the stack.

        * codegen.cs (EmitContext::EmitStatementExpression): Use the
        facilties of ExpressionStatement if possible.

        * cs-parser.jay: Update statement_expression.

2001-09-25  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs: Change the wording of message

2001-09-25  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Binary::ResolveOperator): Had forgottten to set 
        the type of the expression to the return type of the method if
        we have an overloaded operator match ! The regression tests pass again !
        (Unary::ResolveOperator): Ditto.

        * expression.cs (Invocation::ConversionExists): Correct the member lookup
        to find "op_Implicit", not "implicit" ;-)
        (UserImplicitCast): New class to take care of user-defined implicit conversions.
        (ConvertImplicit, ForceConversion): Take TypeContainer argument

        * everywhere : Correct calls to the above accordingly.

        * expression.cs (UserImplicitCast::Resolve, ::Emit): Implement.
        (ConvertImplicit): Do user-defined conversion if it exists.

2001-09-24  Miguel de Icaza  <miguel@ximian.com>

        * assign.cs: track location.
        (Resolve): Use implicit conversions on assignment.

        * literal.cs: Oops.  Not good, Emit of short access values should
        pass (Bytes) or the wrong argument will be selected.

        * expression.cs (Unary::Emit): Emit code for -expr.
        
        (Unary::ResolveOperator): Handle `Substract' for non-constants
        (substract from zero from the non-constants).
        Deal with Doubles as well. 
        
        (Expression::ConvertImplicitRequired): New routine that reports an
        error if no implicit conversion exists. 

        (Invocation::OverloadResolve): Store the converted implicit
        expressions if we make them
        
2001-09-24  Ravi Pratap  <ravi@ximian.com>

        * class.cs (ConstructorInitializer): Take a Location argument.
        (ConstructorBaseInitializer): Same here.
        (ConstructorThisInitializer): Same here.

        * cs-parser.jay : Update all calls accordingly.

        * expression.cs (Unary, Binary, New): Take location argument.
        Update accordingly everywhere.

        * cs-parser.jay : Update all calls to the above to take a location
        argument.

        * class.cs : Ditto.

2001-09-24  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Invocation::BetterFunction): Take TypeContainer argument
        (Invocation::BetterConversion): Same here
        (Invocation::ConversionExists): Ditto.

        (Invocation::ConversionExists): Implement.

2001-09-22  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (OverloadResolve): Improve some more to catch errors 1502 and 1503
        Also take an additional TypeContainer argument.

        * All over : Pass in TypeContainer as argument to OverloadResolve.

        * typemanager.cs (CSharpName): Update to check for the string type and return
        that too.

        * expression.cs (Invocation::FullMethodDesc): New static method to return a string fully describing
        a given method.
        
2001-09-21  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Invocation::OverloadResolve): Re-write to conform more to the spec.
        (Invocation::BetterFunction): Implement.
        (Invocation::BetterConversion): Implement.
        (Invocation::ConversionExists): Skeleton, no implementation yet.

        Okay, things work fine !

2001-09-21  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs: declare and load enum_type, delegate_type and
        void_type. 

        * expression.cs (Expression::Emit): Now emit returns a value that
        tells whether a value is left on the stack or not.  This strategy
        might be reveted tomorrow with a mechanism that would address
        multiple assignments.
        (Expression::report118): Utility routine to report mismatches on
        the ExprClass.

        (Unary::Report23): Report impossible type/operator combination
        utility function.

        (Unary::IsIncrementableNumber): Whether the type can be
        incremented or decremented with add.
        (Unary::ResolveOperator): Also allow enumerations to be bitwise
        complemented. 
        (Unary::ResolveOperator): Implement ++, !, ~, ++ and --.

        (Invocation::Emit): Deal with new Emit convetion.
        
        * All Expression derivatives: Updated their Emit method to return
        whether they leave values on the stack or not.
        
        * codegen.cs (CodeGen::EmitStatement): Pop values left on the
        stack for expressions that are statements. 

2001-09-20  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (LValue): New interface.  Must be implemented by
        LValue objects.
        (LocalVariableReference, ParameterReference, FieldExpr): Implement
        LValue interface.
        
        * assign.cs (Assign::Emit, Assign::Resolve): Use new LValue
        interface for generating code, simplifies the code.

2001-09-20  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (everywhere): Comment out return statements in ::Resolve
        methods to avoid the warnings.

2001-09-20  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs (parse): Report error 2001 if we can not open the
        source file.

        * expression.cs (SimpleName::ResolveSimpleName): Error if we can
        not resolve it.

        * cs-parser.jay (QualifierIdentifier): Pass location to SimpleName
        object. 

        * statement.cs (Block::EmitMeta): Reuse the count across all the variables,
        otherwise nested blocks end up with the same index.

        * codegen.cs (CodeGen::EmitTopBlock): Pass initial sequence

        * expression.cs:  Instead of having FIXMEs in the Resolve
        functions, throw exceptions so it is obvious that we are facing a
        bug. 

        * cs-parser.jay (invocation_expression): Pass Location information.

        * codegen.cs (CodeGen::Save, CodeGen::CodeGen, CodeGen::Basename):
        Use a basename for those routines because .NET does not like paths
        on them. 

        * class.cs (TypeContainer::AddMethod): Do not call DefineName if the name was
        already defined.

2001-09-19  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (TypeManager::CoreLookupType): A function to make sure that we
        are loading the correct data types (throws an exception if not).
        (TypeManager::InitCoreTypes): Use CoreLookupType

        * expression.cs (Unary::ResolveOperator): return the child
        expression for expressions which are just +expr.
        (Unary::ResolveOperator): Return negative literals for -LITERAL
        expressions (otherwise they are Unary {Literal}).
        (Invocation::Badness): Take into account `Implicit constant
        expression conversions'.

        * literal.cs (LongLiteral): Implement long literal class.
        (IntLiteral): export the `Value' of the intliteral. 

2001-09-19  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Binary::Emit): Finally get the emission right ! Woo!

        * class.cs (Operator::Define): Change the methodname prefix to 'op_' 
        instead of 'Operator'

        * expression.cs (Binary::ResolveOperator): Update accordingly.
        (Unary::Operator): Change names to 'Add' and 'Subtract' instead 'Plus'
        and 'Minus'

        * cs-parser.jay (unary_expression): Update to use the new names.

        * gen-treedump.cs (GetUnary): Same here.

        * expression.cs (Unary::Resolve): Implement.
        (Binary::ResolveOperator): Re-write bits to quietly continue if no overloaded 
        operators are found instead of making noise ;-)
        (Unary::ResolveOperator): New method to do precisely the same thing which
        Binary::ResolveOperator does for Binary expressions.
        (Unary.method, .Arguments): Add.
        (Unary::OperName): Implement.   
        (Unary::ForceConversion): Copy and Paste !

        * class.cs (Operator::Define): Fix a small bug for the case when we have 
        a unary operator.

        * expression.cs (Unary::Emit): Implement. Need to find the right Opcodes
        for the inbuilt operators. Only overloading works for now ;-)

2001-09-18  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (CheckedExpr::Resolve, CheckedExpr::Emit,
        UnCheckedExpr::Resolve, UnCheckedExpr::Emit): Implement.

        * expression.cs (This::Emit): Implement. 
        (This::Resolve): Implement.
        (TypeOf:Resolve): Implement.
        (Expression::ResolveSimpleName): Add an implicit this to instance
        field references. 
        (MemberAccess::Resolve): Deal with Parameters and Fields. 
        Bind instance variable to Field expressions.
        (FieldExpr::Instance): New field used to track the expression that
        represents the object instance.
        (FieldExpr::Resolve): Track potential errors from MemberLookup not
        binding 
        (FieldExpr::Emit): Implement.

        * codegen.cs (EmitIf, EmitStatement, EmitBlock): Propagate whether
        the last instruction contains a return opcode to avoid generating
        the last `ret' instruction (this generates correct code, and it is
        nice to pass the peverify output).

        * class.cs (TypeContainer::EmitFieldInitializers): Implement field
        initializer for static and instance variables.
        (Constructor::Emit): Allow initializer to be null in the case of
        static constructors.  Only emit initializer for instance
        constructors. 

        (TypeContainer::FindMembers): Return a null array if there are no
        matches.

        Also fix the code for the MemberTypes.Method branch, as it was not
        scanning that for operators (or tried to access null variables before).

        * assign.cs (Assign::Emit): Handle instance and static fields. 

        * TODO: Updated.

        * driver.cs: Stop compilation if there are parse errors.

        * cs-parser.jay (constructor_declaration): Provide default base
        initializer for non-static constructors.
        (constructor_declarator): Do not provide a default base
        initializers if none was specified.
        Catch the fact that constructors should not have parameters.

        * class.cs: Do not emit parent class initializers for static
        constructors, that should be flagged as an error.

2001-09-18  Ravi Pratap  <ravi@ximian.com>

        * class.cs (RegisterMethodBuilder): Remove : it's unnecessary.
        Move back code into TypeContainer::Populate.

2001-09-18  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::AddConstructor): Fix the check to
        compare against Name, not Basename. 
        (Operator::OpType): Change Plus and Minus to Add and Subtract.

        * cs-parser.jay : Update accordingly.

        * class.cs (TypeContainer::FindMembers): For the case where we are searching
        for methods, don't forget to look into the operators too.
        (RegisterMethodBuilder): Helper method to take care of this for
        methods, constructors and operators.
        (Operator::Define): Completely revamp.
        (Operator.OperatorMethod, MethodName): New fields.
        (TypeContainer::Populate): Move the registering of builders into
        RegisterMethodBuilder.
        (Operator::Emit): Re-write.

        * expression.cs (Binary::Emit): Comment out code path to emit method
        invocation stuff for the case when we have a user defined operator. I am
        just not able to get it right !
        
2001-09-17  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Expression::OverloadResolve): Drop TypeContainer
        argument. 

        (Expression::MemberLookup): Provide a version that allows to
        specify the MemberTypes and BindingFlags. 

        * statement.cs (Block::GetVariableInfo): Forgot to recurse here,
        so it was not fetching variable information from outer blocks.

        * modifiers.cs: (Modifiers::TypeAttr): Invert condition on
        Beforefieldinit as it was buggy.

        * rootcontext.cs (::LookupInterfaceOrClass): Removed an Error -200
        that Ravi put here.  

        * class.cs (Constructor::Emit): Only emit if block is not null.
        (TypeContainer::EmitDefaultConstructor): Removed routine, now we
        deal with this by semantically definining it as if the user had
        done it.

        (TypeContainer::FindMembers): Removed ad-hoc hack to deal with
        constructors as we now "emit" them at a higher level.

        (TypeContainer::DefineDefaultConstructor): Used to define the
        default constructors if none was provided.

        (ConstructorInitializer): Add methods Resolve and Emit. 
        
        * expression.cs: Cast to ConstructorInfo instead of MethodInfo

2001-09-17  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::EmitDefaultConstructor): Register
        the default constructor builder with our hashtable for methodbuilders
        to methodcores.

        * expression.cs (Invocation::OverloadResolve): Add a check for pd == null
        and argument_count is 0 in which case we have a match.
        (Binary::ResolveOperator): More null checking and miscellaneous coding
        style cleanup.

2001-09-17  Ravi Pratap  <ravi@ximian.com>

        * rootcontext.cs (IsNameSpace): Compare against null.

        * everywhere : Correct spelling to 'Greater' and to 'Subtract'

        * class.cs (Operator::OpType): Change names to match the ones in Binary::Operator
        and Unary::Operator.

        * cs-parser.jay (operator_declaration, CheckBinaryOperator, CheckUnaryOperator): Update
        accordingly.

        * expression.cs (Binary::method): New member to hold the MethodBase for the case when
        we have overloaded operators.
        (Binary::ResolveOperator): Implement the part which does the operator overload
        resolution.

        * class.cs (Operator::Emit): Implement.
        (TypeContainer::Emit): Emit the operators we have too.

        * expression.cs (Binary::Emit): Update to emit the appropriate code for
        the case when we have a user-defined operator.
        
2001-09-17  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs: Fix bug: tree.Namespaces might be null.

2001-09-16  Ravi Pratap  <ravi@ximian.com>

        * class.cs (EmitStaticFieldInitializers, EmitFieldInitializers): Make public.
        (TypeContainer::EmitConstructor): Remove and move code into Contructor::Emit.
        (Constructor::Emit): Implement.
        (EmitStaticFieldInitializers, EmitFieldInitializers): Ensure we return immediately
        if we have no work to do. 
        (TypeContainer::Emit): Pass in TypeContainer as argument to the constructor's 
        Emit method.

        * interface.cs (Interface::InterfaceAttr): Re-write to be more correct and complete.
        (Interface::IsTopLevel): Add. Same as TypeContainer::IsTopLevel.

        * class.cs (TypeContainer::IsTopLevel): Modify to use parent.Parent instead
        of parent.parent.

2001-09-15  Ravi Pratap  <ravi@ximian.com>

        * tree.cs (Tree::namespaces): New hashtable to keep track of namespaces
        in the source.
        (Tree::RecordNamespace): Method to do what the name says ;-)
        (Tree::Namespaces): Property to get at the namespaces hashtable.

        * cs-parser.jay (namespace_declaration): Call RecordNamespace to 
        keep track.

        * rootcontext.cs (IsNamespace): Fixed it :-)

2001-09-14  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer::FindMembers): Add support for
        constructors. 
        (MethodCore): New class that encapsulates both the shared aspects
        of a Constructor and a Method.  
        (Method, Constructor): Factored pieces into MethodCore.

        * driver.cs: Added --fatal which makes errors throw exceptions.
        Load System assembly as well as part of the standard library.

        * report.cs: Allow throwing exceptions on errors for debugging.

        * modifiers.cs: Do not use `parent', instead use the real type
        container to evaluate permission settings.

        * class.cs: Put Ravi's patch back in.  He is right, and we will
        have to cope with the

2001-09-14  Ravi Pratap  <ravi@ximian.com>

        * modifiers.cs (TypeAttr, MethodAttr, FieldAttr): Map protected internal to
        FamORAssem, not FamANDAssem.
        
2001-09-14  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs: Added --parse option that only parses its input files
        and terminates.

        * class.cs: Reverted last change from Ravi to IsTopLevel.  That is
        incorrect.  IsTopLevel is not used to tell whether an object is
        root_types or not (that can be achieved by testing this ==
        root_types).  But to see if this is a top-level *class* (not
        necessarly our "toplevel" container). 

2001-09-14  Ravi Pratap  <ravi@ximian.com>

        * enum.cs (Enum::Define): Modify to call the Lookup method on the
        parent instead of a direct call to GetType.

2001-09-14  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::TypeAttr): Remove property code and move it into
        Modifiers.TypeAttr. This should just be a call to that method.

        * modifiers.cs (TypeAttr): Re-write and take an extra argument, the TypeContainer
        object so that we can determine if we are top-level or not.

        * delegate.cs (Delegate::Define): Update call to TypeAttr method to pass in the 
        TypeContainer too.

        * enum.cs (Enum::Define): Ditto.

        * modifiers.cs (FieldAttr): Re-write.

        * class.cs (TypeContainer::IsTopLevel): Change accessibility to public.
        (TypeContainer::HaveStaticConstructor): New property to provide access
        to precisely that info.

        * modifiers.cs (MethodAttr): Re-write.
        (EventAttr): Remove altogether as there seems to be no ostensible use for it.

        * class.cs (TypeContainer::IsTopLevel): Re-write. root_types doesn't seem to be the parent
        of top-level types as claimed.
        
2001-09-13  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (MemberLookup): Fruitless attempt to lookup
        constructors.  Maybe I need to emit default constructors?  That
        might be it (currently .NET emits this for me automatically).
        (Invocation::OverloadResolve): Cope with Arguments == null.
        (Invocation::EmitArguments): new function, shared by the new
        constructor and us.
        (Invocation::Emit): Handle static and instance methods.  Emit
        proper call instruction for virtual or non-virtual invocations.
        (New::Emit): Implement.
        (New::Resolve): Implement.
        (MemberAccess:Resolve): Implement.
        (MethodGroupExpr::InstanceExpression): used conforming to the spec
        to track instances.
        (FieldExpr::Resolve): Set type.

        * support.cs: Handle empty arguments.
                
        * cs-parser.jay (CompositeLookup, QualifierIdentifier,
        SimpleLookup): Auxiliary routines to help parse a qualifier
        identifier.  

        Update qualifier_identifier rule.

        * codegen.cs: Removed debugging messages.

        * class.cs: Make this a global thing, this acts just as a "key" to
        objects that we might have around.

        (Populate): Only initialize method_builders_to_methods once.

        * expression.cs (PropertyExpr): Initialize type from the
        PropertyType. 

        * codegen.cs (EmitContext::EmitBoolExpression): Use propper
        Resolve pattern.  Attempt to implicitly convert value to boolean.
        Emit code.

        * expression.cs: Set the type for the int32/int32 argument case.
        (Binary::ResolveOperator): Set the return type to boolean for
        comparission operators

        * typemanager.cs: Remove debugging print code.

        (Invocation::Resolve): resolve type.

        * class.cs: Allocate a MemberInfo of the correct size, as the code
        elsewhere depends on the test to reflect the correct contents.

        (Method::) Keep track of parameters, due to System.Reflection holes

        (TypeContainer::Populate): Keep track of MethodBuilders to Method
        mapping here.

        (TypeContainer::FindMembers): Use ArrayList and then copy an array
        of the exact size and return that.

        (Class::LookupMethodByBuilder): New function that maps
        MethodBuilders to its methods.  Required to locate the information
        on methods because System.Reflection bit us again.

        * support.cs: New file, contains an interface ParameterData and
        two implementations: ReflectionParameters and InternalParameters
        used to access Parameter information.  We will need to grow this
        as required.

        * expression.cs (Invocation::GetParameterData): implement a cache
        and a wrapper around the ParameterData creation for methods. 
        (Invocation::OverloadResolve): Use new code.

2001-09-13  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::EmitField): Remove and move into 
        (Field::Define): here and modify accordingly.
        (Field.FieldBuilder): New member.
        (TypeContainer::Populate): Update accordingly.
        (TypeContainer::FindMembers): Implement.

2001-09-13  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs: (VariableInfo::VariableType): New field to be
        initialized with the full type once it is resolved. 

2001-09-12  Miguel de Icaza  <miguel@ximian.com>

        * parameter.cs (GetParameterInfo): Use a type cache to compute
        things only once, and to reuse this information

        * expression.cs (LocalVariableReference::Emit): Implement.
        (OpcodeCast::Emit): fix.

        (ParameterReference::Resolve): Implement.
        (ParameterReference::Emit): Implement.

        * cs-parser.jay: Fix bug introduced by Ravi, variable initializers
        that are expressions need to stay as Expressions.

        * typemanager.cs (CSharpName): Returns the C# name of a type if
        possible. 

        * expression.cs (Expression::ConvertImplicit): New function that
        implements implicit type conversions.

        (Expression::ImplicitReferenceConversion): Implements implicit
        reference conversions.

        (EmptyCast): New type for transparent casts.

        (OpcodeCast): New type for casts of types that are performed with
        a sequence of bytecodes.
        
        (BoxedCast): New type used for casting value types into reference
        types.  Emits a box opcode.

        (Binary::DoNumericPromotions): Implements numeric promotions of
        and computation of the Binary::Type.

        (Binary::EmitBranchable): Optimization.

        (Binary::Emit): Implement code emission for expressions.
        
        * typemanager.cs (TypeManager): Added two new core types: sbyte
        and byte.

2001-09-12  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::FindMembers): Method which does exactly
        what Type.FindMembers does, only we don't have to use reflection. No
        implementation yet.

        * typemanager.cs (typecontainers): New hashtable to hold the corresponding
        typecontainer objects as we need to get at them.
        (TypeManager::AddUserType): Overload to take an extra argument, the TypeContainer.

        * rootcontext.cs : Correspondingly modify called to AddUserType to pass the
        typecontainer object.

        * expression.cs (MemberLookup): Modify signature to take a RootContext object instead
        of just a Report object.

2001-09-11  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Event::Define): Go back to using the prefixes "add_" and
        "remove_"
        (TypeContainer::Populate): Now define the delegates of the type too.
        (TypeContainer.Delegates): Property to access the list of delegates defined
        in the type.

        * delegates.cs (Delegate::Define): Implement partially.

        * modifiers.cs (TypeAttr): Handle more flags.

2001-09-11  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Indexer::Define): Fix for loop iteration condition to be just <
        and not <=
        (Operator::Define): Re-write logic to get types by using the LookupType method
        instead of blindly doing a Type.GetType ! How stupid can I get ;-) ?
        (Indexer::Define): Ditto.
        (Event::Define): Ditto.
        (Property::Define): Ditto.
        
2001-09-10  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::Populate): Now define operators too. 
        (TypeContainer.Operators): New property to access the list of operators
        in a type.
        (Operator.OperatorMethodBuilder): New member to hold the method builder
        for the operator we are defining.
        (Operator::Define): Implement.

2001-09-10  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Event::Define): Make the prefixes of the accessor methods
        addOn_ and removeOn_ 

        * genericparser.cs (GenericParser::error): Overloaded method to handle the case
        of the location being passed in too. Ideally, this should go later since all
        error reporting should be done through the Report object.

        * class.cs (TypeContainer.Indexers): New property to access the list of indexers.
        (Populate): Iterate thru the indexers we have and define them too.
        (Indexer.GetMethodBuilder, .SetMethodBuilder): New members to hold the method builders
        for the get and set accessors.
        (Indexer::Define): Implement.
        
2001-09-09  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Binary::Resolve): Beginning of it.  I scratched
        my previous implementation, did not work.

        * typemanager.cs: Add a couple of missing types (the longs).

        * literal.cs: Use TypeManager.bool_type instead of getting it.

        * expression.cs (EventExpr): New kind of expressions.
        (Expressio::ExprClassFromMemberInfo): finish

2001-09-08  Miguel de Icaza  <miguel@ximian.com>

        * assign.cs: Emit stores to static fields differently.

2001-09-08  Ravi Pratap  <ravi@ximian.com>

        * Merge in changes and adjust code to tackle conflicts. Backed out my
        code in Assign::Resolve ;-) 

2001-09-08  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (CheckAttributeTarget): Modify call to error to use
        instead Report.Error and also pass in the location.
        (CSharpParser::Lexer): New readonly property to return the reference
        to the Tokenizer object.
        (declare_local_variables): Use Report.Error with location instead of plain 
        old error.
        (CheckDef): Ditto.

        * class.cs (Operator::CheckUnaryOperator): Move into cs-parser.jay.
        (Operator.CheckBinaryOperator): Ditto.

        * cs-parser.jay (operator_declarator): Update accordingly.

        * cs-parser.jay (CheckUnaryOperator): Modify to use Report.Error
        (CheckBinaryOperator): Same here.

        * rootcontext.cs (LookupType): Add an extra lookup which simply does a lookup
        on the name without any prefixes of namespace names etc. This is because we
        already might have something already fully qualified like 
        'System.Console.WriteLine'

        * assign.cs (Resolve): Begin implementation. Stuck ;-)

2001-09-07  Ravi Pratap  <ravi@ximian.com>

        * cs-tokenizer.cs (location): Return a string which also contains
        the file name.

        * expression.cs (ElementAccess): New class for expressions of the
        type 'element access.'
        (BaseAccess): New class for expressions of the type 'base access.'
        (CheckedExpr, UnCheckedExpr): New classes for Checked and Unchecked expressions
        respectively.
        
        * cs-parser.jay (element_access): Implement action.
        (base_access): Implement actions.
        (checked_expression, unchecked_expression): Implement.

        * cs-parser.jay (local_variable_type): Correct and implement.
        (type_suffixes, type_suffix_list, type_suffix): Implement actions.

        * cs-tokenizer.cs (real_type_suffix): Comment out the extra getchar.

        * cs-parser.jay (rank_specifiers): Remove space while concatenating the type's
        name and the specifiers.

        * interface.cs (InterfaceAttr): New property to return the corresponding TypeAttributes
        
        * rootcontext.cs (CreateInterface): Use the InterfaceAttr property instead of 
        making them all public ;-)

        * cs-parser.jay (error): Remove entirely as we have an implementation in the base
        class anyways.
        
2001-09-07  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (ExprClassFromMemberInfo): Return FieldExpr and
        PropertyExprs.
        (FieldExpr, PropertyExprs): New resolved expressions.
        (SimpleName::MemberStaticCheck): Perform static checks for access
        to non-static fields on static methods. Maybe this should be
        generalized for MemberAccesses. 
        (SimpleName::ResolveSimpleName): More work on simple name
        resolution. 

        * cs-parser.jay (primary_expression/qualified_identifier): track
        the parameter index.

        * codegen.cs (CodeGen::Save): Catch save exception, report error.
        (EmitContext::EmitBoolExpression): Chain to expression generation
        instead of temporary hack.
        (::EmitStatementExpression): Put generic expression code generation.

        * assign.cs (Assign::Emit): Implement variable assignments to
        local variables, parameters and fields.

2001-09-06  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Block::GetVariableInfo): New method, returns the
        VariableInfo for a variable name in a block.
        (Block::GetVariableType): Implement in terms of GetVariableInfo

        * literal.cs (IntLiteral::Emit, FloatLiteral::Emit,
        DoubleLiteral::Emit, CharLiteral::Emit, BoolLiteral::Emit): Implement

2001-09-06  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (operator_declaration): Continue on my quest : update
        to take attributes argument.
        (event_declaration): Ditto.
        (enum_declaration): Ditto.
        (indexer_declaration): Ditto.
        
        * class.cs (Operator::Operator): Update constructor accordingly.
        (Event::Event): Ditto.

        * delegate.cs (Delegate::Delegate): Same here.

        * enum.cs (Enum::Enum): Same here.
        
2001-09-05  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (CheckAttributeTarget): Update to use the right error number.

        * ../tests/cs0658.cs : New file to demonstrate error 0658.

        * attribute.cs (Attributes): New class to encapsulate all attributes which were
        being passed around as an arraylist.
        (Attributes::AddAttribute): Method to add attribute sections.

        * cs-parser.jay (opt_attributes): Modify actions to use the new Attributes class.
        (struct_declaration): Update accordingly.
        (constant_declaration): Update.
        (field_declaration): Update.
        (method_header): Update.
        (fixed_parameter): Update.
        (parameter_array): Ditto.
        (property_declaration): Ditto.
        (destructor_declaration): Ditto.
        
        * class.cs (Struct::Struct): Update constructors accordingly.
        (Class::Class): Ditto.
        (Field::Field): Ditto.
        (Method::Method): Ditto.
        (Property::Property): Ditto.
        (TypeContainer::OptAttribute): update property's return type.
        
        * interface.cs (Interface.opt_attributes): New member.
        (Interface::Interface): Update to take the extra Attributes argument.

        * parameter.cs (Parameter::Parameter): Ditto.

        * constant.cs (Constant::Constant): Ditto.

        * interface.cs (InterfaceMemberBase): New OptAttributes field.
        (InterfaceMemberBase::InterfaceMemberBase): Update constructor to take 
        the attributes as a parameter.
        (InterfaceProperty): Update constructor call.
        (InterfaceEvent): Ditto.
        (InterfaceMethod): Ditto.
        (InterfaceIndexer): Ditto.

        * cs-parser.jay (interface_indexer_declaration): Update call to constructor to 
        pass the attributes too.
        (interface_event_declaration): Ditto.
        (interface_property_declaration): Ditto.
        (interface_method_declaration): Ditto.
        (interface_declaration): Ditto.

2001-09-05  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Method::Define): Track the "static Main" definition to
        create an entry point. 

        * rootcontext.cs (RootContext::EntryPoint): MethodInfo that holds the
        EntryPoint if we find it. 

        * codegen.cs (EmitContext::EmitInvocation): Emit invocations.
        (EmitContext::ig): Make this variable public.

        * driver.cs: Make the default output file be the first file name
        with the .exe extension.  

        Detect empty compilations

        Handle various kinds of output targets.  Handle --target and
        rename -t to --dumper.

        * expression.cs, literal.cs, assign.cs, constant.cs: All `Resolve'
        methods inherited from Expression return now an Expression.  This
        will is used during the tree rewriting as we resolve them during
        semantic analysis.

        (Expression::MemberLookup): Implements the MemberLookup (7.3) from
        the spec.  Missing entirely is the information about
        accessability of elements of it.

        (Expression::ExprClassFromMemberInfo): New constructor for
        Expressions that creates a fully initialized Expression based on
        a MemberInfo that is one of Eventinfo, FieldINfo, PropertyInfo or
        a Type.

        (Invocation::Resolve): Begin implementing resolution of invocations.
        
        * literal.cs (StringLiteral):  Implement Emit.

2001-09-05  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (error): Add new modifier because we are hiding an inherited
        member.
        
2001-09-04  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (attribute_arguments): Implement actions.
        (attribute): Fix bug in production. Implement action.
        (attribute_list): Implement.
        (attribute_target): Implement.
        (attribute_target_specifier, opt_target_specifier): Implement
        (CheckAttributeTarget): New method to check if the attribute target
        is valid.
        (attribute_section): Implement.
        (opt_attributes): Implement.

        * attribute.cs : New file to handle attributes.
        (Attribute): Class to hold attribute info.

        * cs-parser.jay (opt_attribute_target_specifier): Remove production
        (attribute_section): Modify production to use 2 different rules to 
        achieve the same thing. 1 s/r conflict down !
        Clean out commented, useless, non-reducing dimension_separator rules.
        
        * class.cs (TypeContainer.attributes): New member to hold list
        of attributes for a type.
        (Struct::Struct): Modify to take one more argument, the attribute list.
        (Class::Class): Ditto.
        (Field::Field): Ditto.
        (Method::Method): Ditto.
        (Property::Property): Ditto.
        
        * cs-parser.jay (struct_declaration): Update constructor call to
        pass in the attributes too.
        (class_declaration): Ditto.
        (constant_declaration): Ditto.
        (field_declaration): Ditto.
        (method_header): Ditto.
        (fixed_parameter): Ditto.
        (parameter_array): Ditto.
        (property_declaration): Ditto.

        * constant.cs (Constant::Constant): Update constructor similarly.
        Use System.Collections.

        * parameter.cs (Parameter::Parameter): Update as above.

2001-09-02  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::AddDelegate): New method to add a delegate.
        (TypeContainer.delegates): New member to hold list of delegates.

        * cs-parser.jay (delegate_declaration): Implement the action correctly 
        this time as I seem to be on crack ;-)

2001-09-02  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs (RootContext::IsNamespace): new function, used to
        tell whether an identifier represents a namespace.

        * expression.cs (NamespaceExpr): A namespace expression, used only
        temporarly during expression resolution.
        (Expression::ResolveSimpleName, ::ResolvePrimary, ::ResolveName):
        utility functions to resolve names on expressions.

2001-09-01  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs: Add hook for StatementExpressions. 

        * class.cs: Fix inverted test for static flag in methods.

2001-09-02  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Operator::CheckUnaryOperator): Correct error number used
        to make it coincide with MS' number.
        (Operator::CheckBinaryOperator): Ditto.

        * ../errors/errors.txt : Remove error numbers added earlier.

        * ../errors/cs1019.cs : Test case for error # 1019

        * ../errros/cs1020.cs : Test case for error # 1020

        * cs-parser.jay : Clean out commented cruft.
        (dimension_separators, dimension_separator): Comment out. Ostensibly not
        used anywhere - non-reducing rule.
        (namespace_declarations): Non-reducing rule - comment out.

        * enum.cs (Enum::AddEnum): Rename to AddEnumMember as I was getting confused
        with TypeContainer::AddEnum.

        * delegate.cs : New file for delegate handling classes.
        (Delegate): Class for declaring delegates.

        * makefile : Update.

        * cs-parser.jay (delegate_declaration): Implement.

2001-09-01  Ravi Pratap  <ravi@che.iitm.ac.in>

        * class.cs (Event::Define): Implement.
        (Event.EventBuilder): New member.

        * class.cs (TypeContainer::Populate): Update to define all enums and events
        we have.
        (Events): New property for the events arraylist we hold. Shouldn't we move to using
        readonly fields for all these cases ?

2001-08-31  Ravi Pratap  <ravi@che.iitm.ac.in>

        * class.cs (Property): Revamp to use the convention of making fields readonly.
        Accordingly modify code elsewhere.

        * class.cs : Apply patch from Mr. Mandar <go_mono@hotmail.com> for implementing
        the Define method of the Property class.

        * class.cs : Clean up applied patch and update references to variables etc. Fix 
        trivial bug.
        (TypeContainer::Populate): Update to define all the properties we have. Also
        define all enumerations.

        * enum.cs (Define): Implement.
        
2001-08-31  Ravi Pratap  <ravi@che.iitm.ac.in>

        * cs-parser.jay (overloadable_operator): The semantic value is an
        enum of the Operator class.
        (operator_declarator): Implement actions.
        (operator_declaration): Implement.

        * class.cs (Operator::CheckUnaryOperator): New static method to help in checking
        validity of definitions.
        (Operator::CheckBinaryOperator): Static method to check for binary operators
        (TypeContainer::AddOperator): New method to add an operator to a type.

        * cs-parser.jay (indexer_declaration): Added line to actually call the
        AddIndexer method so it gets added ;-)

        * ../errors/errors.txt : Update to include new error numbers. Are these numbers 
        already taken care of by the MS compiler ?  

2001-08-29  Ravi Pratap  <ravi@che.iitm.ac.in>

        * class.cs (Operator): New class for operator declarations.
        (Operator::OpType): Enum for the various operators.

2001-08-29  Ravi Pratap  <ravi@che.iitm.ac.in>

        * class.cs (TypeContainer::AddIndexer): Remove FIXME comment. We
        ostensibly handle this in semantic analysis.

        * cs-parser.jay (general_catch_clause): Comment out
        (specific_catch_clauses, specific_catch_clause): Ditto.
        (opt_general_catch_clause, opt_specific_catch_clauses): Ditto
        (catch_args, opt_catch_args): New productions.
        (catch_clause): Rewrite to use the new productions above
        (catch_clauses): Modify accordingly.
        (opt_catch_clauses): New production to use in try_statement
        (try_statement): Revamp. Basically, we get rid of one unnecessary rule
        and re-write the code in the actions to extract the specific and
        general catch clauses by being a little smart ;-)

        * ../tests/try.cs : Fix. It's not 'finalize' my friend, it's 'finally' !
        Hooray, try and catch statements parse fine !
        
2001-08-28  Ravi Pratap  <ravi@che.iitm.ac.in>

        * statement.cs (Block::GetVariableType): Fix logic to extract the type
        string from the hashtable of variables.

        * cs-parser.jay (event_accessor_declarations): Trivial fix. Man, how did
        I end up making that mistake ;-)
        (catch_clauses): Fixed gross error which made Key and Value of the 
        DictionaryEntry the same : $1 !!

2001-08-28  Ravi Pratap  <ravi@che.iitm.ac.in>

        * cs-tokenizer.cs (initTokens): Add keywords 'add' and 'remove'

        * cs-parser.jay (event_declaration): Correct to remove the semicolon
        when the add and remove accessors are specified. 

2001-08-28  Ravi Pratap  <ravi@che.iitm.ac.in>

        * cs-parser.jay (IndexerDeclaration): New helper class to hold
        information about indexer_declarator.
        (indexer_declarator): Implement actions.
        (parsing_indexer): New local boolean used to keep track of whether
        we are parsing indexers or properties. This is necessary because 
        implicit_parameters come into picture even for the get accessor in the 
        case of an indexer.
        (get_accessor_declaration, set_accessor_declaration): Correspondingly modified.

        * class.cs (Indexer): New class for indexer declarations.
        (TypeContainer::AddIndexer): New method to add an indexer to a type.
        (TypeContainer::indexers): New member to hold list of indexers for the
        type.

2001-08-27  Ravi Pratap  <ravi@che.iitm.ac.in>

        * cs-parser.jay (add_accessor_declaration): Implement action.
        (remove_accessor_declaration): Implement action.
        (event_accessors_declaration): Implement
        (variable_declarators): swap statements for first rule - trivial.

        * class.cs (Event): New class to hold information about event
        declarations.
        (TypeContainer::AddEvent): New method to add an event to a type
        (TypeContainer::events): New member to hold list of events.

        * cs-parser.jay (event_declaration): Implement actions.

2001-08-27  Ravi Pratap  <ravi@che.iitm.ac.in>

        * cs-parser.jay (dim_separators): Implement. Make it a string
        concatenating all the commas together, just as they appear.
        (opt_dim_separators): Modify accordingly
        (rank_specifiers): Update accordingly. Basically do the same
        thing - instead, collect the brackets here.
        (opt_rank_sepcifiers): Modify accordingly.
        (array_type): Modify to actually return the complete type string
        instead of ignoring the rank_specifiers.
        (expression_list): Implement to collect the expressions
        (variable_initializer): Implement. We make it a list of expressions
        essentially so that we can handle the array_initializer case neatly too.
        (variable_initializer_list): Implement.
        (array_initializer): Make it a list of variable_initializers
        (opt_array_initializer): Modify accordingly.

        * expression.cs (New::NType): Add enumeration to help us
        keep track of whether we have an object/delegate creation
        or an array creation.
        (New:NewType, New::Rank, New::Indices, New::Initializers): New
        members to hold data about array creation.
        (New:New): Modify to update NewType
        (New:New): New Overloaded contructor for the array creation
        case.

        * cs-parser.jay (array_creation_expression): Implement to call
        the overloaded New constructor.
        
2001-08-26  Ravi Pratap  <ravi@che.iitm.ac.in>

        * class.cs (TypeContainer::Constructors): Return member
        constructors instead of returning null.

2001-08-26  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (InitCoreTypes): Initialize the various core
        types after we have populated the type manager with the user
        defined types (this distinction will be important later while
        compiling corlib.dll)

        * expression.cs, literal.cs, assign.cs, constant.cs: Started work
        on Expression Classification.  Now all expressions have a method
        `Resolve' and a method `Emit'.

        * codegen.cs, cs-parser.jay: Fixed the bug that stopped code
        generation from working.     Also add some temporary debugging
        code. 
        
2001-08-24  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs: Lots of code generation pieces.  This is only the
        beginning, will continue tomorrow with more touches of polish.  We
        handle the fundamentals of if, while, do, for, return.  Others are
        trickier and I need to start working on invocations soon.
        
        * gen-treedump.cs: Bug fix, use s.Increment here instead of
        s.InitStatement. 

        * codegen.cs (EmitContext): New struct, used during code
        emission to keep a context.   Most of the code generation will be
        here. 

        * cs-parser.jay: Add embedded blocks to the list of statements of
        this block.  So code generation proceeds in a top down fashion.

2001-08-23  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs: Add support for multiple child blocks.

2001-08-22  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs (EmitCode): New function, will emit the code for a
        Block of code given a TypeContainer and its ILGenerator. 

        * statement.cs (Block): Standard public readonly optimization.
        (Block::Block constructors): Link children. 
        (Block::Child): Child Linker.
        (Block::EmitVariables): Emits IL variable declarations.

        * class.cs: Drop support for MethodGroups here, delay until
        Semantic Analysis.
        (Method::): Applied the same simplification that I did before, and
        move from Properties to public readonly fields.
        (Method::ParameterTypes): Returns the parameter types for the
        function, and implements a cache that will be useful later when I
        do error checking and the semantic analysis on the methods is
        performed.
        (Constructor::GetCallingConvention): Renamed from CallingConvetion
        and made a method, optional argument tells whether this is a class
        or a structure to apply the `has-this' bit.
        (Method::GetCallingConvention): Implement, returns the calling
        convention. 
        (Method::Define): Defines the type, a second pass is performed
        later to populate the methods.

        (Constructor::ParameterTypes): implement a cache similar to the
        one on Method::ParameterTypes, useful later when we do semantic
        analysis. 

        (TypeContainer::EmitMethod):  New method.  Emits methods.

        * expression.cs: Removed MethodGroup class from here.
        
        * parameter.cs (Parameters::GetCallingConvention): new method.

2001-08-21  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer::Populate): Drop RootContext from the
        argument. 

        (Constructor::CallingConvention): Returns the calling convention.
        (Constructor::ParameterTypes): Returns the constructor parameter
        types. 
        
        (TypeContainer::AddConstructor): Keep track of default constructor
        and the default static constructor.

        (Constructor::) Another class that starts using `public readonly'
        instead of properties. 

        (Constructor::IsDefault): Whether this is a default constructor. 

        (Field::) use readonly public fields instead of properties also.

        (TypeContainer::TypeAttr, TypeContainer::AddConstructor): Keep
        track of static constructors;  If none is used, turn on
        BeforeFieldInit in the TypeAttributes. 

        * cs-parser.jay (opt_argument_list): now the return can be null
        for the cases where there are no arguments. 

        (constructor_declarator): If there is no implicit `base' or
        `this', then invoke the default parent constructor. 
        
        * modifiers.cs (MethodAttr): New static function maps a set of
        modifiers flags into a MethodAttributes enum
        (FieldAttr): renamed from `Map'.  So now we have FieldAttr,
        MethodAttr, TypeAttr to represent the various mappings where the
        modifiers are used.
        (FieldAttr): Map also `readonly' to `FieldAttributes.InitOnly'  

2001-08-19  Miguel de Icaza  <miguel@ximian.com>

        * parameter.cs (GetParameterInfo): Fix bug where there would be no
        method arguments.

        * interface.cs (PopulateIndexer): Implemented the code generator
        for interface indexers.

2001-08-17  Miguel de Icaza  <miguel@ximian.com>

        * interface.cs (InterfaceMemberBase): Now we track the new status
        here.  

        (PopulateProperty): Implement property population.  Woohoo!  Got
        Methods and Properties going today. 

        Removed all the properties for interfaces, and replaced them with
        `public readonly' fields. 

2001-08-16  Miguel de Icaza  <miguel@ximian.com>

        * interface.cs (AddEvent, AddMethod, AddIndexer, AddProperty):
        initialize their hashtables/arraylists only when they are needed
        instead of doing this always.

        * parameter.cs: Handle refs and out parameters.

        * cs-parser.jay: Use an ArrayList to construct the arguments
        instead of the ParameterCollection, and then cast that to a
        Parameter[] array.

        * parameter.cs: Drop the use of ParameterCollection and use
        instead arrays of Parameters.

        (GetParameterInfo): Use the Type, not the Name when resolving
        types. 

2001-08-13  Miguel de Icaza  <miguel@ximian.com>

        * parameter.cs: Eliminate the properties Name, Type and ModFlags,
        and instead use public readonly fields.

        * class.cs: Put back walking code for type containers.

2001-08-11  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (MakeConstant): Code to define constants.

        * rootcontext.cs (LookupType): New function.  Used to locate types 

        
2001-08-08  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs: OH MY!  My trick works!   It is amazing how nice
        this System.Reflection code is.  Kudos to Microsoft
        
        * typemanager.cs: Implement a type cache and avoid loading all
        types at boot time.  Wrap in LookupType the internals.  This made
        the compiler so much faster.  Wow.  I rule!
        
        * driver.cs: Make sure we always load mscorlib first (for
        debugging purposes, nothing really important).

        * Renamespaced things that were on `CSC' to `CIR'.  Maybe I should
        have moved to `CSC' rather than `CIR'.  Oh man!  The confussion!  

        * rootcontext.cs: Lookup types on their namespace;  Lookup types
        on namespaces that have been imported using the `using' keyword.

        * class.cs (TypeContainer::TypeAttr): Virtualize.
        (Class::TypeAttr): Return attributes suitable for this bad boy.
        (Struct::TypeAttr): ditto.
        Handle nested classes.
        (TypeContainer::) Remove all the type visiting code, it is now
        replaced with the rootcontext.cs code

        * rootcontext.cs (GetClassBases): Added support for structs. 

2001-08-06  Miguel de Icaza  <miguel@ximian.com>

        * interface.cs, statement.cs, class.cs, parameter.cs,
        rootcontext.cs, gen-treedump.cs, enum.cs, cs-parse.jay:
        Drop use of TypeRefs, and use strings instead.

2001-08-04  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs: 

        * class.cs (Struct::Struct): set the SEALED flags after
        checking the modifiers.
        (TypeContainer::TypeAttr): new property, returns the
        TypeAttributes for a class.  

        * cs-parser.jay (type_list): Oops, list production was creating a
        new list of base types.

        * rootcontext.cs (StdLib): New property.
        (GetInterfaceTypeByName): returns an interface by type name, and
        encapsulates error handling here.
        (GetInterfaces): simplified.
        (ResolveTree): Encapsulated all the tree resolution here.
        (CreateClass, GetClassBases, GetInterfaceOrClass): Create class
        types. 
        
        * driver.cs: Add support for --nostdlib, to avoid loading the
        default assemblies.
        (Main): Do not put tree resolution here. 

        * rootcontext.cs: Beginning of the class resolution.

2001-08-03  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs: Provide better error reporting. 

        * cs-parser.jay (interface_base): set our $$ to be interfaces.

        * rootcontext.cs (CreateInterface): Handle the case where there
        are no parent interfaces.
        
        (CloseTypes): Routine to flush types at the end.
        (CreateInterface): Track types.
        (GetInterfaces): Returns an array of Types from the list of
        defined interfaces.

        * typemanager.c (AddUserType): Mechanism to track user types (puts
        the type on the global type hash, and allows us to close it at the
        end). 
        
2001-08-02  Miguel de Icaza  <miguel@ximian.com>

        * tree.cs: Removed RecordType, added RecordClass, RecordStruct and
        RecordInterface instead.

        * cs-parser.jay: Updated to reflect changes above.

        * decl.cs (Definition): Keep track of the TypeBuilder type that
        represents this type here.  Not sure we will use it in the long
        run, but wont hurt for now.

        * driver.cs: Smaller changes to accomodate the new code.

        Call ResolveInterfaceBases, Call ResolveClassBases, Save assembly
        when done. 

        * rootcontext.cs (CreateInterface):  New method, used to create
        the System.TypeBuilder type for interfaces.
        (ResolveInterfaces): new entry point to resolve the interface
        hierarchy. 
        (CodeGen): Property, used to keep track of the code generator.

2001-07-26  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Add a second production for delegate_declaration
        with `VOID'.

        (enum_body): Put an opt_comma here instead of putting it on
        enum_body or enum_member_declarations so we can handle trailing
        commas on enumeration members.  Gets rid of a shift/reduce.
        
        (type_list): Need a COMMA in the middle.

        (indexer_declaration): Tell tokenizer to recognize get/set

        * Remove old targets.

        * Re-add the parser target.

2001-07-13  Simon Cozens <simon@simon-cozens.org>

        * cs-parser.jay: Add precendence rules for a number of operators
        ot reduce the number of shift/reduce conflicts in the grammar.
        
2001-07-17  Miguel de Icaza  <miguel@ximian.com>

        * tree.cs: moved IGenerator interface and renamed it to ITreeDump
        and put it here.

        Get rid of old crufty code.

        * rootcontext.cs: Use this to keep track of the parsed
        representation and the defined types available to the program. 

        * gen-treedump.cs: adjust for new convention.

        * type.cs: Split out the type manager, and the assembly builder
        from here. 

        * typemanager.cs: the type manager will live here now.

        * cil-codegen.cs: And the code generator here. 

2001-07-14  Sean MacIsaac  <macisaac@ximian.com>

        * makefile: Fixed up for easy making.

2001-07-13  Simon Cozens <simon@simon-cozens.org>

        * cs-parser.jay (rank_specifier): Remove a conflict by reordering
        the 

        (unary_expression): Expand pre_increment_expression and
        post_decrement_expression to reduce a shift/reduce.

2001-07-11  Simon Cozens

        * cs-tokenizer.cs: Hex numbers should begin with a 0.

        Improve allow_keyword_as_indent name.

2001-06-19  Miguel de Icaza  <miguel@ximian.com>

        * Adjustments for Beta2. 

2001-06-13  Miguel de Icaza  <miguel@ximian.com>

        * decl.cs: Added `Define' abstract method.
        (InTransit): new property, used to catch recursive definitions. 

        * interface.cs: Implement `Define'. 

        * modifiers.cs: Map Modifiers.constants to
        System.Reflection.TypeAttribute flags.

        * class.cs: Keep track of types and user-defined types.
        (BuilderInit): New method for creating an assembly
        (ResolveType): New function to launch the resolution process, only
        used by interfaces for now.

        * cs-parser.jay: Keep track of Classes, Structs and Interfaces
        that are inserted into the name space. 

2001-06-08  Miguel de Icaza  <miguel@ximian.com>

        * ARGH.  I have screwed up my tree so many times due to the use of
        rsync rather than using CVS.  Going to fix this at once. 

        * driver.cs: Objetify driver.  Load assemblies, use assemblies to
        load types.

2001-06-07  Miguel de Icaza  <miguel@ximian.com>

        * Experiment successful: Use System.Type rather that our own
        version of Type.  

2001-05-25  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Removed nsAliases from here.

        Use new namespaces, handle `using XXX;' 

        * namespace.cs: Reimplemented namespace handling, use a recursive
        definition of the class.  Now we can keep track of using clauses
        and catch invalid using clauses.

2001-05-24  Miguel de Icaza  <miguel@ximian.com>

        * gen-treedump.cs: Adapted for all the renaming.

        * expression.cs (Expression): this class now has a Type property
        which returns an expression Type.

        (Probe::, New::, TypeOf::, SizeOf::, Constant::): renamed from
        `Type', as this has a different meaning now in the base

2001-05-22  Miguel de Icaza  <miguel@ximian.com>

        * interface.cs, class.cs: Removed from all the sources the
        references to signature computation, as we can not do method
        signature computation during the parsing time, as we are not
        trying to solve at that point distinguishing:

        class X {
                void a (Blah x) {}
                void a (NS.Blah x) {}
        }

        Which depending on the context might be valid or not, as we do not
        know if Blah is the same thing as NS.Blah at that point.

        * Redid everything so the code uses TypeRefs now instead of
        Types.  TypeRefs are just temporary type placeholders, that need
        to be resolved.  They initially have a pointer to a string and the
        current scope in which they are used.  This is used later by the
        compiler to resolve the reference to an actual Type. 

        * DeclSpace is no longer a CIR.Type, and neither are
        TypeContainers (Class and Struct) nor Interfaces nor Enums.  They
        are all DeclSpaces, but no Types. 

        * type.cs (TypeRefManager): This implements the TypeRef manager,
        which keeps track of all the types that need to be resolved after
        the parsing has finished. 

2001-05-13  Miguel de Icaza  <miguel@ximian.com>

        * ARGH.  We are going to have to store `foreach' as a class rather
        than resolving it, as we need to verify error 1579 after name
        resolution.   *OR* we could keep a flag that says `This request to
        IEnumerator comes from a foreach statement' which we can then use
        to generate the error.

2001-05-10  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer.AddMethod): we now add methods to the
        MethodGroup instead of the method hashtable.  

        * expression.cs: Add MethodGroup abstraction, which gets us one
        step closer to the specification in the way we handle method
        declarations.  

        * cs-parser.jay (primary_expression): qualified_identifier now
        tried to match up an identifier to a local variable reference or
        to a parameter reference.

        current_local_parameters is now a parser global variable that
        points to the current parameters for the block, used during name
        lookup.

        (property_declaration): Now creates an implicit `value' argument to
        the set accessor.

2001-05-09  Miguel de Icaza  <miguel@ximian.com>

        * parameter.cs: Do not use `param' arguments as part of the
        signature, per the spec.

2001-05-08  Miguel de Icaza  <miguel@ximian.com>

        * decl.cs: Base class for classes, structs and interfaces.  This
        is the "Declaration Space" 

        * cs-parser.jay: Use CheckDef for checking declaration errors
        instead of having one on each function.

        * class.cs: Factor out some code for handling error handling in
        accordance to the "Declarations" section in the "Basic Concepts"
        chapter in the ECMA C# spec.

        * interface.cs: Make all interface member classes derive from
        InterfaceMemberBase.

2001-05-07  Miguel de Icaza  <miguel@ximian.com>

        * Many things: all interfaces are parsed and generated in
        gen-treedump.  Support for member variables, constructors,
        destructors, properties, constants is there.

        Beginning of the IL backend, but very little done, just there for
        testing purposes. 

2001-04-29  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Fix labeled statement.

        * cs-tokenizer.cs (escape): Escape " and ' always.
        ref_line, ref_name: keep track of the line/filename as instructed
        by #line by the compiler.
        Parse #line.

2001-04-27  Miguel de Icaza  <miguel@ximian.com>

        * System.CodeDOM/CodeBinaryOperatorExpression.cs: Rearrange enum
        to match the values in System.CodeDOM.

        Divid renamed to Divide.

        * System.CodeDOM/CodeForLoopStatement.cs: Always have valid
        statements. 
        (Statements.set): remove.

        * System.CodeDOM/CodeCatchClause.cs: always have a valid
        statements. 

        * System.CodeDOM/CodeIfStatement.cs: trueStatements and
        falseStatements always have valid values. 

        * cs-parser.jay: Use System.CodeDOM now.