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2002-03-15  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs: Add support for --resources.

        * expression.cs: (FetchGetMethod, FetchAddressMethod, EmitAssign):
        Make all types for the various array helper methods be integer.

        * ecore.cs (Expression.ConvertNumericExplicit): Pass the
        CheckState to ConvCast.

        (ConvCast): Now it takes a `checked' state argument, to avoid
        depending on the emit context for the conversion, and just using
        the resolve time setting.

        * expression.cs (ArrayCreation.EmitArrayArguments): New function,
        instead of Invocation.EmitArguments.  We do not emit the original
        arguments, instead we emit those which have been converted to
        unsigned int expressions.

        * statement.cs (Block.EmitMeta): Drop tracking of indexes.

        * codegen.cs: ditto.

        * expression.cs (LocalVariableReference): Drop the use of the
        Store function that depended on the variable index.

        * statement.cs (VariableInfo): Drop the `Idx' property from this
        class, as this is not taking into account the indexes for
        temporaries tat we generate during the execution, getting the
        indexes wrong.

        * class.cs: First emit class initializers, then call the parent
        constructor. 

        * expression.cs (Binary): Fix opcode emision.
        (UnaryMutator.EmitCode): Support checked code generation

        * ecore.cs (MemberLookup): TypeManager.FindMembers will return
        matches for events for both the Static and Instance scans,
        pointing to the same element.   Fix that.

2002-03-14  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs (ResolveTree): Always set the
        interface_resolve_order, because nested interfaces will be calling
        into us.

        * class.cs (GetInterfaceOrClass): Track the same resolution
        process used by TypeManager.LookupType.  This fixes the nested
        type lookups in class declarations (separate path from
        LookupType). 

        (TypeContainer.DefineType): Also define nested interfaces.
        (TypeContainer.RegisterOrder): New public function used to
        register the order in which child interfaces need to be closed.

        Nested interfaces need to be closed after their parents have been
        created. 
        
        * interface.cs (InterfaceAttr): Put all the logic for computing
        the interface attribute here. 

        (DefineInterface): Register our interface order with the
        RootContext or with the TypeContainer depending on the case.

2002-03-12  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: rework foreach statement to work with the new
        changes to the policy on SimpleNames.
        
        * report.cs: support Stacktrace on warnings as well.

        * makefile: drop --unsafe and /unsafe from the compile.

2002-03-13  Ravi Pratap  <ravi@ximian.com>

        * ecore.cs (StandardConversionExists): Modify to take an Expression
        as the first parameter. Ensure we do null -> reference type conversion
        checking.

        * Everywhere : update calls accordingly, making use of MyEmptyExpr to store
        temporary Expression objects.

Wed Mar 13 12:32:40 CET 2002 Paolo Molaro <lupus@ximian.com>

        * interface.cs: workaround bug in method overloading resolution
        (there is already a bugzilla bug for it).

2002-03-12  Miguel de Icaza  <miguel@ximian.com>

        We could also solve this problem by having a separate path for
        performing type lookups, instead of DoResolve, we could have a
        ResolveType entry point, and only participating pieces of the
        production (simplename, deref, array) would implement this. 
        
        * codegen.cs (EmitContext): New field OnlyLookupTypes used to
        signal SimpleName to only resolve type names and not attempt to
        resolve anything else.

        * expression.cs (Cast): Set the flag.

        * ecore.cs (SimpleName): Use the OnlyLookupTypes flag

        * class.cs: Only report 108 if there is no `new' modifier.

        * cs-parser.jay: rework foreach statement to work with the new
        changes to the policy on SimpleNames.
        
        * report.cs: support Stacktrace on warnings as well.

        * makefile: drop --unsafe and /unsafe from the compile.

2002-03-11  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (SimpleName.SimpleNameResolve): Perform local variable
        lookups here, instead of doing that at parse time.  This means
        that our grammar will not introduce `LocalVariableReferences' as
        expressions at this point.  That solves the problem of code like
        this:

        class X {
           static void Main ()
           { int X = 1;
            { X x = null }}}

        This is only half the fix.  The full fix requires parameters to
        also be handled in this way.

        * Everywhere: Use ec.DeclSpace on calls to LookupType, as this
        makes the use more obvious of the DeclSpace.  The
        ec.TypeContainer.TypeBuilder is now only used to pull the
        TypeBuilder for it.

        My theory is that I can get rid of the TypeBuilder completely from
        the EmitContext, and have typecasts where it is used (from
        DeclSpace to where it matters).  

        The only pending problem is that the code that implements Aliases
        is on TypeContainer, and probably should go in DeclSpace.

        * ecore.cs (SimpleName.SimpleNameResolve): Perform local variable
        lookups here, instead of doing that at parse time.  This means
        that our grammar will not introduce `LocalVariableReferences' as
        expressions at this point.  That solves the problem of code like
        this:

        class X {
           static void Main ()
           { int X = 1;
            { X x = null }}}

        This is only half the fix.  The full fix requires parameters to
        also be handled in this way.

        * class.cs (Property.DefineMethod): When implementing an interface
        method, set newslot, when implementing an abstract method, do not
        set the flag (before we tried never setting it, or always setting
        it, which is the difference).
        (Indexer.DefineMethod): same.
        (Method.DefineMethod): same.

        * ecore.cs: Only set the status used flag if we get back a Field.

        * attribute.cs: Temporary hack, so Paolo can keep working.

2002-03-08  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (Attribute.UnmanagedType): This is to keep track of
        the unmanaged type in the case we have a MarshalAs attribute.

        (Resolve): Handle the case when we are parsing the special MarshalAs
        attribute [we need to store the unmanaged type to use later]
        
        * typemanager.cs (marshal_as_attr_type): Built in type for the 
        MarshalAs Attribute.

        * attribute.cs (ApplyAttributes): Recognize the MarshalAs attribute 
        on parameters and accordingly set the marshalling info.
        
2002-03-09  Miguel de Icaza  <miguel@ximian.com>

        * class.cs: Optimizing slightly by removing redundant code after
        we switched to the `NoTypes' return value.
        (Property.DefineMethod): use NoTypes here too.

        This fixes the bug I introduced in my last batch of changes.

2002-03-05  Ravi Pratap  <ravi@ximian.com>

        * tree.cs (RecordEnum): Add. We now keep track of enums too.

        * class.cs (LookupInterfaceOrClass): Check against the list of recorded
        Enums since those are types too. 

        * cs-parser.jay (enum_declaration): Record enums as we parse them.
        
        * enum.cs (DefineEnum): Return if the TypeBuilder has already been defined 
        thanks to a call during the lookup process.

2002-03-07  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Foreach): Lots of work to accomodate a particular
        kind of foreach statement that I had not kept in mind.  It is
        possible to have foreachs on classes that provide a GetEnumerator
        method that return objects that implement the "pattern" for using
        a foreach, there is no need to support GetEnumerator
        specifically. 

        This is needed to compile nant.

        * decl.cs: Only report 114 if the member is not `Finalize' and if
        the warning level is at least 2.

        * class.cs: Moved the compare function from Method to
        MethodSignature. 

        (MethodSignature.InheritableMemberSignatureCompare): Add new
        filter function that is used to extract inheritable methods from a
        class. 

        (Method.Define): Use the new `inheritable_method_signature_filter'
        delegate

        * cs-tokenizer.cs (get_cmd_arg): Do not add white space to the
        command. 

2002-03-06  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (Expression.ConvertReferenceExplicit): Removed dead code.

        * cs-parser.jay: Add opt_semicolon to the interface declaration.

        * expression.cs: Pass location information to
        ConvertImplicitStandard. 

        * class.cs: Added debugging code to track return values from
        interfaces. 

2002-03-05  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Is.DoResolve): If either side of the `is' is an
        interface, do not flag the warning.

        * ecore.cs (ImplicitReferenceConversion): We need a separate test
        for interfaces

        * report.cs: Allow for --fatal to be used with --probe.
        
        * typemanager.cs (NoTypes): Move the definition for the empty Type
        array here. 

        * class.cs (TypeContainer.FindMembers): Also look for methods defined by
        properties. 
        (TypeContainer.DefineProxy): New function used to proxy to parent
        implementations when implementing interfaces.
        (TypeContainer.ParentImplements): used to lookup if our parent
        implements a public function that is required by an interface.
        (TypeContainer.VerifyPendingMethods): Hook this up.

        * typemanager.cs (TypeManager, AddModule, AddAssembly): Make the
        `modules' and `assemblies' arraylists into arrays.  We only grow
        these are the very early start up of the program, so this improves
        the speedof LookupType (nicely measured).

        * expression.cs (MakeByteBlob): Replaced unsafe code with
        BitConverter, as suggested by Paolo.

        * cfold.cs (ConstantFold.Binary): Special case: perform constant
        folding of string concatenation, but if either side is a string,
        and the other is not, then return null, and let the runtime use
        the concatenation on the string plus the object (using
        `Object.ToString'). 

2002-03-04  Miguel de Icaza  <miguel@ximian.com>

        Constant Folding has been implemented now.
        
        * expression.cs (Unary.Reduce): Do not throw an exception, catch
        the error instead on types that are not supported in one's
        complement. 

        * constant.cs (Constant and all children): New set of functions to
        perform implict and explicit conversions.
        
        * ecore.cs (EnumConstant): Implement the new functions to perform
        conversion by proxying to the child expression.

        * codegen.cs: (ConstantCheckState): Constant evaluation has its
        own separate setting that can not be turned off from the command
        line using --unchecked or --checked and is only controlled using
        the checked/unchecked statements and expressions.  This setting is
        used by the constant folder to flag errors.

        * expression.cs (CheckedExpr, UncheckedExpr): Set the
        ConstantCheckState as well.   

        During Resolve, they also have to flag the state, because the
        constant folder runs completely in the Resolve phase.

        * statement.cs (Checked, Unchecked): Set the ConstantCheckState as
        well.

2002-03-01  Miguel de Icaza  <miguel@ximian.com>

        * cfold.cs: New file, this file contains the constant folder.
        
        * ecore.cs (IMemoryLocation.AddressOf): Now takes an extra
        argument to track whether we are using the resulting address to
        load or store a value and provide better error messages. 

        (FieldExpr.Emit, FieldExpr.EmitAssign, FieldExpr.AddressOf): Use
        new AddressOf arguments.

        * statement.cs (Foreach.EmitCollectionForeach): Update

        * expression.cs (Argument.Emit): Call AddressOf with proper
        arguments to track usage.

        (New.DoEmit): Call AddressOf with new arguments.

        (Unary.Emit): Adjust AddressOf call.

2002-03-01  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (member_access): Change the case for pre-defined types
        to use a MemberAccess instead of a SimpleName. Thanks to Felix again for 
        this suggestion.

        * class.cs (Operator::Emit): If we are abstract or extern, we don't have
        a method body.

        * attribute.cs (CheckAttribute, ApplyAttribute): Ensure that we treat operators
        essentially like methods and apply attributes like MethodImplOptions to them too.

        * ecore.cs (SimpleName.SimpleNameResolve): Perform a check on ec.TypeContainer.TypeBuilder
        not being null.

        * codegen.cs (EmitContext): The constructor now takes in an extra argument specifying the
        DeclSpace as the distinction is important. We provide sane defaults as usually the TypeContainer
        is the DeclSpace.

        * Update code everywhere accordingly.

        * ecore.cs : Change references to ec.TypeContainer to ec.DeclSpace where appropriate.

        * cs-parser.jay (enum_declaration): Set the current namespace of the enum.

2002-02-28  Ravi Pratap  <ravi@ximian.com>

        * rootcontext.cs (LookupType): As we cycle through the chain of namespaces
        try performing lookups against those instead of jumping straight into using
        the 'using' clauses.

        (ImplicitParent): Add. Thanks to Felix Arrese-Igor for this idea.

        (LookupType): Perform lookups in implicit parents too.

        * class.cs (GetInterfaceOrClass): Modify to perform the exact same lookup
        sequence as RootContext.LookupType. 

        * rootcontext.cs (NamespaceLookup): Split out code from LookupType which tries 
        the various cases of namespace lookups into this method.

2002-03-01  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Add support for [Attribute ()] (empty arguments
        in positional arguments)

        * class.cs (Operator): Update the AllowedModifiers to contain
        extern. 

        * cs-parser.jay: Update operator declaration to allow for the
        operator body to be empty.

        * cs-tokenizer.cs: Added '\u' unicode support in strings and hex
        values. 

2002-02-27  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Method.Emit): Label parameters.

        * driver.cs: Return 1 or 0 as the program exit code.

2002-02-26  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Special case the `null' object when trying to
        auto-compute the type, as anything can be explicitly converted to
        that. 

        * ecore.cs (Expression.ConvertExplicit): Bug fix, thanks for
        spotting this Paolo.

        (Expression.ImplicitNumericConversion): Perform comparissions of
        the type using the underlying type in the case of an enumeration
        rather than using the enumeration type for the compare.

        Cope with the underlying == type case, which is not possible to
        catch before. 

        (Expression.ConvertNumericExplicit): Perform comparissions of
        the type using the underlying type in the case of an enumeration
        rather than using the enumeration type for the compare.

        * driver.cs: If the user does not supply an extension, assume .exe

        * cs-parser.jay (if_statement): Rewrote so that we can track the
        location for the if statement.

        * expression.cs (Binary.ConstantFold): Only concat strings when
        the operation is "+", not everything ;-)

        * statement.cs (Statement.EmitBoolExpression): Take a location
        argument. 
        (If, While, Do): Track location.

        * expression.cs (Binary.ResolveOperator): In the object + string
        case, I was missing a call to ConvertImplicit

2002-02-25  Ravi Pratap  <ravi@ximian.com>

        * parameter.cs (Parameter.ExternalType): Take in extra DeclSpace and
        Location arguments. Ensure we use RootContext.LookupType to do our work
        and not try to do a direct Type.GetType and ModuleBuilder.GetType

        * interface.cs (PopulateMethod): Handle the type of the parameter being
        null gracefully.

        * expression.cs (Invocation.BetterFunction): Handle the case when we 
        have a params method with no fixed arguments and a call is made with no
        arguments.

2002-02-25  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: Add support for the quote-escape-sequence in
        the verbatim-string-literal

        * support.cs (InternalParameters.ParameterModifier): handle null
        fixed parameters.
        (InternalParameters.ParameterType): ditto.

        * parameter.cs (VerifyArgs): Also check if the fixed parameter is
        duplicating the name of the variable parameter.
        (GetParameterByName): Fix bug where we were not looking up array
        paramters if they were the only present (thanks Paolo!).
        (GetParameterInfo): We only have an empty set of types if both
        fixed and array are set to null.
        (GetParameterInfo-idx): Handle FixedParameter == null

        * cs-parser.jay: Handle the case where there is no catch
        statements (missing null test).

2002-02-22  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs (MainDriver): Be conservative on our command line
        handling.

        Catch DirectoryNotFoundException when calling GetFiles.
        
        (SplitPathAndPattern): Used to split the input specification into
        a path and a pattern that we can feed to Directory.GetFiles.

2002-02-21  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Fixed): Implement the last case of the Fixed
        statement (string handling).

        * expression.cs (StringPtr): New class used to return a char * to
        a string;  Used by the Fixed statement.

        * typemanager.cs: Add char_ptr_type.  Add get_OffsetToStringData method.

        * expression.cs (Binary.ResolveOperator): Remove redundant
        MemberLookup pn parent type.
        Optimize union call, we do not need a union if the types are the same.
        (Unary.ResolveOperator): REmove redundant MemberLookup on parent
        type.

        Specialize the use of MemberLookup everywhere, instead of using
        the default settings. 

        (StackAlloc): Implement stackalloc keyword.

        * cs-parser.jay: Add rule to parse stackalloc.
        
        * driver.cs: Handle /h, /help, /?

        * expression.cs (MakeByteBlob): Removed the hacks we had in place
        before we supported unsafe code.
        
        * makefile: add --unsafe to the self compilation of mcs.

2002-02-20  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (PointerArithmetic): New class that is used to
        perform pointer arithmetic.
        (Binary.Resolve): Handle pointer arithmetic
        Handle pointer comparission.
        (ArrayPtr): Utility expression class that is used to take the
        address of an array.

        (ElementAccess): Implement array access for pointers
        
        * statement.cs (Fixed): Implement fixed statement for arrays, we
        are missing one more case before we are done.

        * expression.cs (Indirection): Implement EmitAssign and set the
        ExprClass to Variable.  This allows pointer dereferences to be
        treated as variables, and to have values assigned to them.
        
        * ecore.cs (Expression.StoreFromPtr): New utility function to
        store values dereferencing.

2002-02-20  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Binary.ResolveOperator): Ensure that we are
        not trying to operate on a void type - this fixes the reported
        bug.

        * decl.cs (CheckMethodAgainstBase): Do not allow overriding if
        the parent implementation is sealed.

        * ../errors/cs0239.cs : Add.

        * attribute.cs (ApplyAttributes): Handle Modulebuilders too.

        * typemanager.cs (unverifiable_code_type): Corresponds to 
        System.Security.UnverifiableCodeAttribute. We need to emit this for modules
        which have unsafe code in them.

        * rootcontext.cs (EmitCode): Emit the above attribute when we are in an 
        unsafe context.

2002-02-19  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: Add support for @"litreal strings"

        Make tokenizer accept pre-processor directives
        on any column (remove the old C-like limitation). 

        * rootcontext.cs (EmitCode): Emit any global attributes.
        (AddGlobalAttributes): Used to keep track of assembly attributes. 

        * attribute.cs (ApplyAttributes): Support AssemblyAttributes.

        * cs-parser.jay: Add support for global attributes.  

2002-02-17  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Indirection): New helper class.  Unary will
        create Indirection classes to be able to implement the
        IMemoryLocation interface on it.

2002-02-16  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay (fixed_statement): reference the right statement.

        * statement.cs (Fixed.Emit): Finish implementing the fixed
        statement for the &x case.

2002-02-14  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Property.Define, Method.Define): Remove newslot when
        `implementing'.  

        * modifiers.cs: My use of NewSlot when `Abstract' was set was
        wrong.  NewSlot should only be used if the `new' keyword is present.

        * driver.cs (GetSystemDir): Use CodeBase instead of FullName for
        locating our system dir.  Sorry about this.

2002-02-13  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs (GetSystemDir): Compute correctly the location of our
        system assemblies.  I was using the compiler directory instead of
        the library directory.

2002-02-13  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (BetterFunction): Put back in what Miguel commented out
        since it is the correct fix. The problem is elsewhere ;-)

        (IsParamsMethodApplicable): Fix bug where we were not checking that the fixed
        parameters of the parms method are themselves compatible or not !

        (StandardConversionExists): Fix very dangerous bug where we were forgetting
        to check that a class implements an interface before saying that an implicit
        conversion was allowed. Use ImplementsInterface to do the checking.

2002-02-13  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Method.Define): Track whether we are an explicit
        implementation or not.  And only call DefineMethodOverride if we
        are an explicit implementation.

        (Property.DefineMethod): Ditto.

2002-02-11  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (BetterFunction): Catch hideous bug which was
         preventing us from detecting ambiguous calls due to implicit casts i.e
        cs0121.

2002-01-29  Miguel de Icaza  <miguel@ximian.com>

        * support.cs (Pair): Remove un-needed method.  I figured why I was
        getting the error in cs-parser.jay, the variable in a foreach loop
        is readonly, and the compiler does not really treat this as a variable.

        * cs-parser.jay (fixed_statement): Fix grammar.  Use ASSIGN
        instead of EQUALS in grammar.  

        * typemanager.cs (VerifyUnmanaged): Report correct error (208)

        * expression.cs (Unary.DoResolve): Check whether the argument is
        managed or not.

2002-01-28  Miguel de Icaza  <miguel@ximian.com>

        * support.cs: Api for Pair to set a value.  Despite the fact that
        the variables are public the MS C# compiler refuses to compile
        code that accesses the field if the variable is part of a foreach
        statement. 

        * statement.cs (Fixed): Begin implementation of the fixed
        statement.

        (Block.AddVariable): Return the VariableInfo on success and null
        on failure instead of true/false. 

        * cs-parser.jay (foreach): Catch errors on variables already
        defined (we were ignoring this value before) and properly unwind
        the block hierarchy

        (fixed_statement): grammar for the fixed statement.

2002-01-25  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (UnaryMutator.IsIncrementableNumber): Allow also
        pointer types to be incretemented.

        (SizeOf): Implement.

        * cs-parser.jay (pointer_member_access): Implement
        expr->IDENTIFIER production.

        * expression.cs (IndexerAccess.DoResolve, ArrayAccess.DoResolve,
        MemberAccess.DoResolve, Invocation.DoResolve): Check for pointers
        on safe contexts.

        (Unary): Implement indirection.

        * ecore.cs (Expression.UnsafeError): Reports error 214 (pointer
        use in non-unsafe context).

        (SimpleName.DoResolve): Check for pointers in field access on safe
        contexts. 

        (Expression.LoadFromPtr): Factor the load-indirect code in this
        function.  This was duplicated in UnboxCast and ParameterReference

2002-01-24  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (ComposedCast): report an error if a pointer cast
        is used in a safe region.

        * ecore.cs (Expression.ConvertExplicit): Add rules for implicit
        pointer type casts in unsafe context.

        * codegen.cs (EmitContext): Set up IsUnsafe.

        * cs-parser.jay (non_expression_type): Add productions for pointer
        casts. 

        * expression.cs (Invocation.EmitCall): Remove chunk of buggy
        code.  We should not use force into static mode if the method is
        not virtual.  Fixes bug in MIS

        * statement.cs (Do.Emit, While.Emit, For.Emit,
        Statement.EmitBoolExpression): Add support to Do and While to
        propagate infinite loop as `I do return' semantics.

        Improve the For case to also test for boolean constants.

        * attribute.cs (Attribute.ApplyAttributes): Add ParameterBuilder
        to the list of attributes we can add.

        Remove `EmitContext' argument.

        * class.cs (Method.Define): Apply parameter attributes.
        (Constructor.Define): Apply parameter attributes.
        (MethodCore.LabelParameters): Move here the core of labeling
        parameters. 

        * support.cs (ReflectionParameters.ParameterModifier,
        InternalParameters.ParameterModifier): Use IsByRef on the type and
        only return the OUT bit for these parameters instead of in/out/ref
        flags.

        This is because I miss-understood things.  The ParameterInfo.IsIn
        and IsOut represent whether the parameter has the [In] and [Out]
        attributes set.  

2002-01-22  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (FieldExpr.Emit): Release temporaries.

        * assign.cs (LocalTemporary.Release): new function.

        * codegen.cs (EmitContext.GetTemporaryStorage,
        EmitContext.FreeTemporaryStorage): Rework the way we deal with
        temporary storage.  Now we can "put back" localbuilders when we
        are done with them

2002-01-21  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (FieldExpr.Emit): Handle initonly fields specially: we
        need to make a copy of the variable to generate verifiable code.

2002-01-19  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs: Compute dynamically the system directory.

        * ecore.cs (CopyNewMethods): reworked, exposed, made public.
        Slower, but more generally useful.  Used by the abstract
        registering implementation. 

        * expression.cs (ResolveMemberAccess): Reorder the way we evaluate
        the rules for the special rule on Type/instances.  First check if
        we have the same name, and if so, try that special static path
        rather than the instance path.
        
2002-01-18  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Emit 642 (warning: possible empty statement) for
        for, while and if.

        * class.cs (TypeBuilder.DefineType): Do not allow inheritance from
        Enum, ValueType, Delegate or Array for non-corlib compiles.

        * cs-tokenizer.cs: Catch long identifiers (645)

        * typemanager.cs (IndexerPropetyName): Ravi never tested this
        piece of code.

        * class.cs (TypeContainer.RegisterRequiredImplementations): Bug
        fix, we were returning too early, so we were not registering
        pending methods from abstract classes.

        Do not register pending methods if the class is abstract.

        * expression.cs (Conditional.DoResolve): Report circular implicit
        conversions when we neecd to compute it for conditional
        expressions. 

        (Is.DoResolve): If the expression is always of the provided type,
        flag warning 183.  If the expression can not ever be of the
        provided type flag warning 184.

        * class.cs: Catch 169 as well.

        * ecore.cs (FieldExpr): For now in AddressOf mark as assigned and
        read. 

2002-01-18  Nick Drochak  <ndrochak@gol.com>

        * makefile: remove path to beta2 csc.exe.  path to csc.exe must be in PATH instead.

2002-01-17  Miguel de Icaza  <miguel@ximian.com>

        * interface.cs: (PopulateMethod): Check for pointers being defined
        only if the unsafe context is active.
        (PopulateProperty): ditto.
        (PopulateIndexer): ditto.

        * class.cs (Method, Method.Define): Allow `unsafe' modifier to be
        specified.  If pointers are present, make sure that they are
        present in an unsafe context.
        (Constructor, Constructor.Define): ditto.
        (Field, Field.Define): ditto.
        (Property, Property.Define): ditto.
        (Event, Event.Define): ditto.

        * interface.cs (Interface.GetInterfaceTypeByName): Only lookup the
        hashtable if there are classes or structs defined.

        * expression.cs (LocalVariableReference.DoResolve): Simplify this
        code, as the constant resolution moved.

        * statement.cs (Block.EmitMeta): Resolve all constants as we emit
        the metadata, so we can flag error 133. 

        * decl.cs (MemberCore.UnsafeOK): New function to test that a
        pointer is being declared in an unsafe context.

2002-01-16  Miguel de Icaza  <miguel@ximian.com>

        * modifiers.cs (Modifiers.Check): Require a Location argument.
        Report error 227 for Unsafe use.

        * typemanager.cs: Remove IsPointerType, we should be using Type.IsPointer

        * statement.cs (For.Emit): If the test is null, then report that
        we do `return', as we wont reach anything afterwards.

        (Switch.SwitchGoverningType): Track the expression that matched
        the conversion.

        * driver.cs: Allow negative numbers as an error code to flag.

        * cs-parser.jay: Handle 1551.

        * namespace.cs: Add 1537 checking (repeated using alias namespaces).

2002-01-15  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Report 1518 (type declaration can only contain
        class, struct, interface, enum or delegate)

        (switch_label): Report 1523 (keywords `case' or `default' must
        preced code)

        (opt_switch_sections): Report 1522 (empty switch)

        * driver.cs: Report 1515 (response file specified multiple times)
        Report 1516 (Source file specified multiple times).

        * expression.cs (Argument.Resolve): Signal 1510

        (BaseAccess.Resolve, BaseIndexer.Resolve): Signal 1511 (base
        access not allowed in static code)

2002-01-11  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (IsPointerType): Utility method which we are going
        to need a lot.

        * ecore.cs (ImplicitReferenceConversion): A pointer type cannot be cast to
        the object type, so we take care of that.

        * expression.cs (FullMethodDesc): Also include the return type in descriptions.
        
        * support.cs (ParameterDesc): Fix minor bug which was causing params tags to be
        added to non-params parameters :-)

        * typemanager.cs (CSharpName): Include 'void' type too. 

        (void_ptr_type): Include in the set of core types.

        * ecore.cs (ConvertImplicit): Make use of ConvertImplicitStandard instead of 
        duplicating code.

        (ConvertImplicitStandard): Handle standard implicit pointer conversions when we have 
        an unsafe context.

        * cs-parser.jay (local_variable_pointer_type): Add support for 'void *' as I had 
        completely forgotten about it.

2002-01-10  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (pointer_type): Add. This begins our implementation
        of parsing rules for unsafe code.

        (unsafe_statement): Implement.

        (embedded_statement): Modify to include the above.

        * statement.cs (Unsafe): Implement new class for unsafe blocks.

        * codegen.cs (EmitContext.InUnsafe): Add. This determines
        if the current context is an unsafe one.

        * cs-parser.jay (local_variable_pointer_type): Since local variable types
        are handled differently, we need separate rules for them.

        (local_variable_declaration): Update to use local_variable_pointer_type
        to allow variable declarations of unmanaged pointer types.

        * expression.cs (Unary.ResolveOperator): Ensure that the '&' operator is used only
        in unsafe contexts.

        * ../errors/cs0214.cs : Add.

2002-01-16  Nick Drochak  <ndrochak@gol.com>

        * makefile: remove 'response' file when cleaning.

2002-01-15  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Report 1524.

2002-01-14  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (RegisterMethod): drop checking if we have
        registered this from here

2002-01-12  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Method.EmitDestructor): Implement calling our base
        destructor. 

        * statement.cs (Try.Emit): Fix to reset the InFinally to the old
        value of InFinally.

        * codegen.cs (EmitContext.EmitTopBlock): Destructors will call
        this routine and will wrap the call in a try/catch block.  Deal
        with the case.

2002-01-11  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (Expression.MemberLookup): instead of taking a
        parameter `same_type' that was used to tell whether we could
        access private members we compute our containing type from the
        EmitContext.

        (FieldExpr): Added partial support for volatile fields.  This does
        not work for volatile fields exposed from assemblies, as I can not
        figure out how to extract the modreq from it.

        Updated all the source files to use this.

        * codegen.cs (EmitContext): Compute ContainerType ahead of time,
        because it is referenced by MemberLookup very often. 

2002-01-09  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (IndexerPropertyName): If we have a TypeBuilder, use
        TypeBuilder.GetCustomAttributes to retrieve what we need.

        Get rid of redundant default_member_attr_type as this is the same as
        default_member_type which already exists.

        * interface.cs, attribute.cs : Update accordingly.
        
2002-01-08  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs: Enable IndexerPropertyName again.  It does not
        work for TYpeBuilders though.  Ravi, can you please fix this?

        * cs-tokenizer.cs: Accept _ as a name in pp-expressions.

        * expression.cs (Argument.Emit): Handle the case of ref objects
        being passed to ref functions;  

        (ParameterReference.EmitLoad): Loads the content of the pointer
        without dereferencing.

2002-01-07  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: Implemented the pre-processing expressions.

2002-01-08  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Indexer.DefineMethod): Incorporate the interface
        type in the name of the method if we are doing explicit interface
        implementation.

        * expression.cs (ConversionExists): Remove as it is completely obsolete.

        (BetterConversion): Fix extremely trivial bug where we were referring to
        ConversionExists instead of StandardConversionExists ! Hooray, things are fine
        again !

        * ../errors/bug16.cs : Add although we have fixed it.

2002-01-07  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (BaseIndexer): Begin implementation.

        * class.cs (TypeContainer.IsInterfaceMethod): Bug fix.

        * cs-parser.jay (indexer_declarator): Use qualified_identifier
        production directly to remove a shift/reduce, and implement
        explicit interface implementation.

        * cs-tokenizer.cs: Fix tokenizer, it was consuming one extra char
        after a floating point suffix.

        * expression.cs (DoNumericPromotions): Improved the conversion for
        uint/uint.  If we have a constant, we avoid doing a typecast to a
        larger type.

        * class.cs (Indexer): Implement explicit interface implementation
        for indexers.
        
Sat Jan 5 16:08:23 CET 2002 Paolo Molaro <lupus@ximian.com>

        * class.cs: make the default instance constructor public and hidebysig.

2001-01-03  Ravi Pratap  <ravi@ximian.com>

        * interface.cs (EmitDefaultMemberAttr): Make this helper method static
        so we can call it from elsewhere.

        * class.cs (TypeContainer.Emit): Emit the attribute here too. The rule is that
        we emit it internally if the class has a defined indexer; otherwise the user
        emits it by decorating the class definition with the DefaultMemberAttribute.

        * attribute.cs (ApplyAttributes): Perform checks to see that the DefaultMember
        attribute is not used on a type which defines an indexer.

        * cs-tokenizer.cs (get_cmd_arg): Ensure we trim whitespace and also include the tab
        character when we skip whitespace.

        * ../errors/cs0646.cs : Add.

2002-01-03  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (SimpleName.ResolveSimpleName): Report error 120
        again. 

        * makefile: Add practical target `mcs3.exe' which builds the third
        generation compiler. 

        * expression.cs (New): Fix structures constructor calling.

        * class.cs (Property, Method, Indexer): Emit Final flag on the
        method if we are an interface implementation and we are not
        abstract. 

        * ecore.cs (PropertyExpr): New public field `IsBase', tells
        whether this property is referencing a `base' method.

        * expression.cs (Invocation.EmitCall): take an extra argument:
        is_base, this is used to determine whether the `call' or
        `callvirt' opcode should be used.

        
        * delegate.cs: update EmitCall.

        * class.cs (Method.Define): Set NewSlot for the cases where we are
        not implementing an interface method.

        (Property.Define): ditto.

2002-01-02  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: (Tokenizer.escape): Escape '\r' as '\r' not as
        'r'.  Allows mcs to parse itself fully.

2002-01-02  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation.num_automatic_initializers): Keep track
        of the number of initializers that require the InitializeArray method.

        (CheckIndices): Store the Expression in all cases - not the plain value. Also
        update the above field where necessary.

        (MakeByteBlob): Update accordingly.

        (DoEmit): Call EmitStaticInitializers only if the number of initializers is 
        greater than 2.

        (EmitDynamicInitializers): Update in accordance with the new optimization.

        (ArrayAccess.EmitStoreOpcode): Include char type along with short and ushort - the
        same OpCode applies.

        * cs-parser.jay : Fix some glaring errors I introduced.

2002-01-01  Ravi Pratap  <ravi@ximian.com> 

        * parameters.cs (AddVariable, AddConstant): Pass in current_local_parameters
        so that we can check for name clashes there too.

        * typemanager.cs (default_member_attr_type): The attribute that we need to emit
        for interface indexers.

        * interfaces.cs (Define): Emit the default member attribute.

        * expression.cs (MakeByteBlob): Fix extremely trivial bug where the wrong
        variable was being referred to while setting the value ;-)

2002-01-01  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (MakeByteBlob): Optimize: we do not need to fill
        byte-by-byte information when we know the data is zero.

        Make the block always a multiple of 4, because
        DefineInitializedData has a bug.

        * assign.cs: Fix, we should assign from the temporary, not from
        the source. 

        * expression.cs (MakeByteBlob): Fix my incorrect code.

2001-12-31  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (EnumToUnderlying): This function is used to get
        the underlying type from an enumeration, because it does not
        always work. 

        * constant.cs: Use the I4_S form for values between -128 and 127.

        * statement.cs (Block.LookupLabel): Looks up a label.
        (Block): Drop support for labeled blocks.

        (LabeledStatement): New kind of statement that represents a label
        only.

        (Goto): Finally implement this bad boy.
        
        * cs-parser.jay: Update to reflect new mechanism to implement
        labels.

2001-12-30  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs (EmitContext.This): a codegen property that keeps the
        a single instance of this instead of creating many different this
        instances. 

        * delegate.cs (Delegate.DoResolve): Update to use the property;

        * ecore.cs (SimpleName.SimpleNameResolve): Ditto

        * expression.cs (BaseAccess.DoResolve): Ditto.

2001-12-29  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (methodimpl_attr_type): Add to hold the type
        corresponding to System.Runtime.CompilerServices.MethodImplAttribute.

        (InitCoreTypes): Update accordingly.

        * attribute.cs (Resolve): Remember if the attribute is a MethodImplAttribute
        so we can quickly store the state.

        (ApplyAttributes): Set the correct implementation flags
        for InternalCall methods.

2001-12-29  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (EmitCall): if a method is not virtual, then do
        not use callvirt on it.

        (ArrayAccess.EmitAssign): storing non-builtin value types (ie,
        user defined stuff) requires the use of stobj, which takes an
        address on the stack instead of an array and an index.  So emit
        the Ldelema operation for it.

        (EmitStoreOpcode): Use stobj for valuetypes.

        (UnaryMutator.EmitCode): Use the right 1 value depending on
        whether we are dealing with int64/uint64, float or doubles.

        * class.cs (TypeContainer.AddConstructor): Fix the logic to define
        constructors that I implemented last night.

        (Constructor.IsDefault): Fix to work properly for static
        constructors.

        * cs-parser.jay (CheckDef): report method signature errors.
        Update error number 103 to be 132.

        * decl.cs: New AdditionResult enumeration value: MethodExists.
        Although we do this check for methods later on in the semantic
        analysis, catching repeated default constructors is so easy that
        we catch these here. 
        
        * expression.cs (Binary.DoNumericPromotions): Fix the uint64 type
        promotions code.

        (ParameterReference.EmitAssign, Emit): handle
        bools as bytes.

        (ArrayAccess.EmitLoadOpcode): Handle bool type here.
        (ArrayAccess.EmitStoreOpcode): ditto.

        * cs-tokenizer.cs (is_punct): Eliminated empty computation.

        * expression.cs (MakeByteBlob): Complete all the missing types
        (uint, short, ushort, byte, sbyte)

        * class.cs: Only init instance field initializers on instance
        constructors. 

        Rename `constructors' to instance_constructors. 

        (TypeContainer.AddConstructor): Only add constructors to the list
        if it is not static.

        Make sure that we handle default_static_constructor independently
        everywhere where we handle instance_constructors

2001-12-28  Miguel de Icaza  <miguel@ximian.com>

        * class.cs: Do not lookup or create a base initializer for a
        static constructor.

        (ConstructorInitializer.Resolve): use the proper type to lookup
        for constructors.

        * cs-parser.jay: Report error 1585 (modifiers between type and name).

        * enum.cs, interface.cs: Remove CloseType, this is taken care by
        in DeclSpace. 

        * decl.cs: CloseType is now an virtual method, the default
        implementation just closes this type.
        
2001-12-28  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (DefinePInvokeMethod): Set the implementation flags
        to PreserveSig by default. Also emit HideBySig on such methods.

        Basically, set the defaults to standard values.

        * expression.cs (Invocation.BetterFunction): We need to make sure that for each
        argument, if candidate is better, it can't be worse than the best !

        (Invocation): Re-write bits to differentiate between methods being
        applicable in their expanded form and their normal form - for params
        methods of course.

        Get rid of use_standard everywhere as only standard conversions are allowed
        in overload resolution. 

        More spec conformance.
        
2001-12-27  Miguel de Icaza  <miguel@ximian.com>

        * driver.cs: Add --timestamp, to see where the compiler spends
        most of its time.

        * ecore.cs (SimpleName.DoResolve): Do not create an implicit
        `this' in static code.

        (SimpleName.DoResolve): Implement in terms of a helper function
        that allows static-references to be passed upstream to
        MemberAccess.

        (Expression.ResolveWithSimpleName): Resolve specially simple
        names when called by MemberAccess to implement the special
        semantics. 

        (Expression.ImplicitReferenceConversion): Handle conversions from
        Null to reference types before others, as Null's type is
        System.Object. 

        * expression.cs (Invocation.EmitCall): Handle the special case of
        calling methods declared on a reference type from a ValueType
        (Base classes System.Object and System.Enum)

        (MemberAccess.Resolve): Only perform lookups on Enumerations if
        the left hand side is a TypeExpr, not on every enumeration. 

        (Binary.Resolve): If types are reference types, then do a cast to
        object on operators != and == of both arguments.
        
        * typemanager.cs (FindMembers): Extract instance and static
        members if requested.

        * interface.cs (PopulateProperty): Use void_type instead of null
        as the return type for the setter method.

        (PopulateIndexer): ditto.

2001-12-27  Ravi Pratap  <ravi@ximian.com>

        * support.cs (ReflectionParameters): Fix minor bug where we
        were examining the wrong parameter for the ParamArray attribute.

        Cope with requests for the type of the parameter at position
        greater than the params parameter's. We now return the element
        type of the params array as that makes more sense.

        * expression.cs (Invocation.IsParamsMethodApplicable): Update 
        accordingly as we no longer have to extract the element type
        ourselves.

        (Invocation.OverloadResolve): Update.

2001-12-27  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Foreach.GetEnumeratorFilter): Do not compare
        against IEnumerator, test whether the return value is a descendant
        of the IEnumerator interface.

        * class.cs (Indexer.Define): Use an auxiliary method to implement
        the other bits of the method definition.  Begin support for
        explicit interface implementation.

        (Property.DefineMethod): Use TypeManager.void_type instead of null
        for an empty return value.

2001-12-26  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (MemberAccess.ResolveMemberAccess): if we are
        dealing with a FieldExpr which is composed of a FieldBuilder, in
        the code path we did extract the constant, but we should have
        obtained the underlying value to be able to cast it (otherwise we
        end up in an infinite loop, this is what Ravi was running into).

        (ArrayCreation.UpdateIndices): Arrays might be empty.

        (MemberAccess.ResolveMemberAccess): Add support for section
        14.5.4.1 that deals with the special case of E.I when E is a type
        and something else, that I can be a reference to a static member.

        (ArrayCreation.MakeByteBlob): It is not an error to not be able to
        handle a particular array type to create byte blobs, it is just
        something we dont generate byteblobs for.

        * cs-tokenizer.cs (get_cmd_arg): Ignore \r in commands and
        arguments. 

        * location.cs (Push): remove the key from the hashtable that we
        are about to add.   This happens for empty files.

        * driver.cs: Dispose files after we have parsed them.

        (tokenize): new function that only runs the tokenizer on its
        input, for speed testing.

2001-12-26  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Event.Define): Define the private field only if there
        are no accessors defined.

        * expression.cs (ResolveMemberAccess): If there is no associated
        field with the event, that means we have an event defined with its
        own accessors and we should flag error cs0070 since transforming
        ourselves into a field is not valid in that case.

        * ecore.cs (SimpleName.DoResolve): Same as above.

        * attribute.cs (DefinePInvokeMethod): Set the default calling convention
        and charset to sane values.

2001-12-25  Ravi Pratap  <ravi@ximian.com>

        * assign.cs (DoResolve): Perform check on events only if they 
        are being accessed outside the declaring type.

        * cs-parser.jay (event_declarations): Update rules to correctly
        set the type of the implicit parameter etc.

        (add_accessor, remove_accessor): Set current local parameters.

        * expression.cs (Binary): For delegate addition and subtraction,
        cast the return value from the method into the appropriate delegate
        type.

2001-12-24  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (RegisterDelegateData, GetDelegateData): Get rid
        of these as the workaround is unnecessary.

        * delegate.cs (NewDelegate.DoResolve): Get rid of bits which registered
        delegate data - none of that is needed at all.

        Re-write bits to extract the instance expression and the delegate method
        correctly.

        * expression.cs (Binary.ResolveOperator): Handle the '-' binary operator 
        on delegates too.

        * attribute.cs (ApplyAttributes): New method to take care of common tasks
        of attaching attributes instead of duplicating code everywhere.

        * everywhere : Update code to do attribute emission using the above method.

2001-12-23  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (IsParamsMethodApplicable): if there are not
        parameters, return immediately.

        * ecore.cs: The 0 literal can be implicity converted to an enum
        type. 

        (SimpleName.DoResolve): First lookup the type, then lookup the
        members. 

        (FieldExpr.Emit): If the InstanceExpression is a ValueType, we
        want to get its address.  If the InstanceExpression is not
        addressable, store the result in a temporary variable, then get
        the address of it.

        * codegen.cs: Only display 219 errors on warning level or above. 

        * expression.cs (ArrayAccess): Make it implement the
        IMemoryLocation interface.

        (Binary.DoResolve): handle the operator == (object a, object b)
        and operator != (object a, object b) without incurring into a
        BoxedCast (because 5 != o should never be performed).

        Handle binary enumerator operators.

        (EmitLoadOpcode): Use Ldelema if the object we are loading is a
        value type, otherwise use Ldelem_ref.

        Use precomputed names;

        (AddressOf): Implement address of

        * cs-parser.jay (labeled_statement): Fix recursive block
        addition by reworking the production.

        * expression.cs (New.DoEmit): New has a special case:
                
                 If we are dealing with a ValueType, we have a few
                 situations to deal with:
                
                    * The target of New is a ValueType variable, that is
                      easy, we just pass this as the variable reference
                
                    * The target of New is being passed as an argument,
                      to a boxing operation or a function that takes a
                      ValueType.
                
                      In this case, we need to create a temporary variable
                      that is the argument of New.


2001-12-23  Ravi Pratap  <ravi@ximian.com>

        * rootcontext.cs (LookupType): Check that current_type is not null before
        going about looking at nested types.

        * ecore.cs (EventExpr.EmitAddOrRemove): Rename from EmitAssign as we do
        not implement the IAssignMethod interface any more.

        * expression.cs (MemberAccess.ResolveMemberAccess): Handle EventExprs specially
        where we tranform them into FieldExprs if they are being resolved from within
        the declaring type.

        * ecore.cs (SimpleName.DoResolve): Do the same here.

        * assign.cs (DoResolve, Emit): Clean up code considerably. 

        * ../errors/bug10.cs : Add.

        * ../errors/cs0070.cs : Add.

        * typemanager.cs : Use PtrHashtable for Delegate data hashtable etc.

        * assign.cs : Get rid of EventIsLocal everywhere.
        
2001-12-23  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (ConvertIntLiteral): finished the implementation.

        * statement.cs (SwitchLabel): Convert the value we are using as a
        key before looking up the table.

2001-12-22  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs (EmitTopBlock): Require a Location argument now.

        * cs-parser.jay (constructor_declarator): We need to setup
        current_local_parameters before we parse the
        opt_constructor_initializer, to allow the variables to be bound
        to the constructor arguments.

        * rootcontext.cs (LookupType): First lookup nested classes in our
        class and our parents before we go looking outside our class.

        * expression.cs (ConstantFold): Extract/debox the values at the
        beginnning. 

        * rootcontext.cs (EmitCode): Resolve the constants first before we
        resolve the types.  This is not really needed, but it helps debugging.

        * statement.cs: report location.
        
        * cs-parser.jay: pass location to throw statement.

        * driver.cs: Small bug fix.

        * report.cs: Updated format to be 4-zero filled digits.

2001-12-22  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (CheckIndices): Fix minor bug where the wrong
        variable was being referred to ;-)

        (DoEmit): Do not call EmitStaticInitializers when the 
        underlying type is System.Object.

2001-12-21  Ravi Pratap  <ravi@ximian.com>

        * ecore.cs (EventExpr.Resolve): Implement to correctly set the type
        and do the usual workaround for SRE.

        * class.cs (MyEventBuilder.EventType): New member to get at the type
        of the event, quickly.

        * expression.cs (Binary.ResolveOperator): Handle delegate addition.

        * assign.cs (Assign.DoResolve): Handle the case when the target
        is an EventExpr and perform the necessary checks.

        * ecore.cs (EventExpr.EmitAssign): Implement the IAssignMethod
        interface.

        (SimpleName.MemberStaticCheck): Include check for EventExpr.

        (EventExpr): Set the type in the constructor itself since we 
        are meant to be born fully resolved.

        (EventExpr.Define): Revert code I wrote earlier.
                
        * delegate.cs (NewDelegate.Resolve): Handle the case when the MethodGroup's
        instance expression is null. The instance expression is a This in that case
        or a null, depending on whether it is a static method or not.

        Also flag an error if the reference to a method is ambiguous i.e the MethodGroupExpr
        refers to more than one method.

        * assign.cs (DoResolve): Check whether the event belongs to the same Type container
        and accordingly flag errors.

2001-12-21  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Throw.Emit): Add support for re-throwing exceptions.

2001-12-22  Miguel de Icaza  <miguel@ximian.com>

        * location.cs (ToString): Provide useful rutine.

2001-12-21  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (Expression.ConvertIntLiteral): Do not return Constant
        objects, return the actual integral boxed.

        * statement.cs (SwitchLabel): define an ILLabel for each
        SwitchLabel. 
        
        (Switch.CheckSwitch): If the value is a Literal, extract
        the underlying literal.
        
        Also in the unused hashtable we had, add the SwitchLabel so we can
        quickly look this value up.

        * constant.cs: Implement a bunch of new constants.  Rewrite
        Literal based on this.  Made changes everywhere to adapt to this.
        
        * expression.cs (Expression.MakeByteBlob): Optimize routine by
        dereferencing array only once, and also copes with enumrations.

        bytes are two bytes wide, not one.

        (Cast): Perform constant conversions.
        
        * ecore.cs (TryImplicitIntConversion): Return literals instead of
        wrappers to the literals here.

        * expression.cs (DoNumericPromotions): long literals can converted
        to ulong implicity (this is taken care of elsewhere, but I was
        missing this spot).

        * ecore.cs (Expression.Literalize): Make the return type Literal,
        to improve type checking.

        * rootcontext.cs: Lookup for nested classes in our class hierarchy.

2001-12-20  Miguel de Icaza  <miguel@ximian.com>

        * literal.cs: Revert code from ravi that checked the bounds.  The
        bounds are sane by the definition of the type itself. 

        * typemanager.cs: Fix implementation of ImplementsInterface.  We
        need to actually look up in our parent hierarchy for interfaces
        implemented. 

        * const.cs: Use the underlying type for enumerations

        * delegate.cs: Compute the basename for the delegate creation,
        that should fix the delegate test case, and restore the correct
        Type Lookup semantics in rootcontext

        * rootcontext.cs: Revert Ravi's last patch.  The correct way of
        referencing a nested type with the Reflection API is using the "+"
        sign. 

        * cs-parser.jay: Do not require EOF token at the end.

2001-12-20  Ravi Pratap  <ravi@ximian.com>

        * rootcontext.cs (LookupType): Concatenate type names with
        a '.' instead of a '+' The test suite passes again.

        * enum.cs (Enum.DefineEnum): Set RTSpecialName on the 'value__'
        field of the enumeration.

        * expression.cs (MemberAccess.ResolveMemberAccess): Add support for
        the case when the member is an EventExpr.

        * ecore.cs (EventExpr.InstanceExpression): Every event which is not
        static has an associated instance expression.

        * typemanager.cs (RegisterEvent): The usual workaround, now for events.

        (GetAddMethod, GetRemoveMethod): Workarounds, as usual.

        * class.cs (Event.Define): Register event and perform appropriate checks
        for error #111.

        We define the Add and Remove methods even if the use provides none because
        in that case, we provide default implementations ourselves.

        Define a private field of the type of the event. This is done by the CSC compiler
        and we should be doing it too ;-)

        * typemanager.cs (delegate_combine_delegate_delegate, delegate_remove_delegate_delegate):
        More methods we use in code we generate.

        (multicast_delegate_type, delegate_type): Two separate types since the distinction
        is important.

        (InitCoreTypes): Update accordingly for the above.

        * class.cs (Event.Emit): Generate code for default accessors that we provide

        (EmitDefaultMethod): Do the job in the above.

        * delegate.cs (DefineDelegate): Use TypeManager.multicast_delegate_type in the 
        appropriate place.

2001-12-20  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Indexer.Define): Fix bug, we were setting both Get/Set
        builders even if we were missing one.

        * interface.cs, class.cs, enum.cs: When calling DefineNestedType
        pass the Basename as our class name instead of the Name.  The
        basename will be correctly composed for us.

        * parameter.cs (Paramters): Now takes a Location argument.

        * decl.cs (DeclSpace.LookupType): Removed convenience function and
        make all the code call directly LookupType in RootContext and take
        this chance to pass the Location information everywhere.

        * Everywhere: pass Location information.

2001-12-19  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (Constructor.Define): Updated way of detecting the
        length of the parameters.

        (TypeContainer.DefineType): Use basename as the type name for
        nested types.

        (TypeContainer.Define): Do not recursively define types here, as
        definition is taken care in order by the RootContext.

        * tree.cs: Keep track of namespaces in a per-file basis.

        * parameter.cs (Parameter.ComputeSignature): Update to use
        DeclSpace. 

        (Parameters.GetSignature): ditto.

        * interface.cs (InterfaceMethod.GetSignature): Take a DeclSpace
        instead of a TypeContainer.

        (Interface.SemanticAnalysis): Use `this' instead of our parent to
        resolve names.  Because we need to be resolve in our context, not
        our parents.
        
        * driver.cs: Implement response files.

        * class.cs (TypeContainer.DefineType): If we are defined, do not
        redefine ourselves.
        
        (Event.Emit): Emit the code for add/remove handlers.
        (Event.Define): Save the MethodBuilders for add/remove.

        * typemanager.cs: Use pair here too.

        * cs-parser.jay: Replaced use of DictionaryEntry for Pair because
        DictionaryEntry requires the first argument to be non-null.  
        
        (enum_declaration): Compute full name for registering the
        enumeration.
        
        (delegate_declaration): Instead of using
        formal_parameter_list, use opt_formal_parameter_list as the list
        can be empty.

        * cs-tokenizer.cs (PropertyParsing): renamed from `properties'
        (EventParsing): New property that controls whether `add' and
        `remove' are returned as tokens or identifiers (for events);

2001-12-19  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Event.Define): Revamp use of EventBuilder completely. We now
        use MyEventBuilder only and let it wrap the real builder for us.

        (MyEventBuilder): Revamp constructor etc.

        Implement all operations that we perform on EventBuilder in precisely the same
        way here too.

        (FindMembers): Update to use the EventBuilder member.

        (Event.Emit): Update accordingly.

2001-12-18  Ravi Pratap  <ravi@ximian.com>

        * class.cs (MyEventBuilder.Set*): Chain to the underlying builder
        by calling the appropriate methods.

        (GetCustomAttributes): Make stubs as they cannot possibly do anything
        useful.

        (Event.Emit): Use MyEventBuilder everywhere - even to set attributes.

2001-12-17  Ravi Pratap  <ravi@ximian.com>

        * delegate.cs (Delegate.Populate): Check that the return type
        and various parameters types are indeed accessible.

        * class.cs (Constructor.Define): Same here.

        (Field.Define): Ditto.

        (Event.Define): Ditto.

        (Operator.Define): Check that the underlying Method defined itself
        correctly - so it's MethodBuilder should not be null.

        * delegate.cs (DelegateInvocation.DoResolve): Bale out if the type of the Instance
        expression happens to be null.

        * class.cs (MyEventBuilder): Workaround for SRE lameness. Implement various abstract
        members but as of now we don't seem to be able to do anything really useful with it.

        (FindMembers): Handle events separately by returning the MyEventBuilder of the event,
        not the EventBuilder.

2001-12-18  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: Add support for defines.
        Add support for #if, #elif, #else, #endif
        
        (eval_var): evaluates a variable.
        (eval): stubbed for evaluating functions.

        * cs-parser.jay: Pass the defines information

        * driver.cs: Add --define command line option.

        * decl.cs: Move MemberCore here.

        Make it the base class for DeclSpace.  This allows us to catch and
        report 108 and 109 for everything now.

        * class.cs (TypeContainer.Define): Extract all the members
        before populating and emit the warning 108 (new keyword required
        to override) instead of having each member implement this.

        (MemberCore.Define): New abstract method, we will be using this in
        the warning reporting engine in Populate.
        
        (Operator.Define): Adjust to new MemberCore protocol. 

        * const.cs (Const): This does not derive from Expression, it is a
        temporary object we use to create fields, it is a MemberCore. 

        * class.cs (Method.Define): Allow the entry point to be in a
        specific class.

        * driver.cs: Rewrite the argument handler to clean it up a bit.

        * rootcontext.cs: Made it just an auxiliary namespace feature by
        making everything static.

        * driver.cs: Adapt code to use RootContext type name instead of
        instance variable.

        * delegate.cs: Remove RootContext argument.

        * class.cs: (Struct, TypeContainer, Class): Remove RootContext
        argument. 

        * class.cs (Event.Define): The lookup can fail.
        
        * cs-tokenizer.cs: Begin implementation of pre-procesor. 

        * expression.cs: Resolve the this instance before invoking the code.

2001-12-17  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Add a production in element_access that allows
        the thing to become a "type" reference.  This way we can parse
        things like "(string [])" as a type.

        Note that this still does not handle the more complex rules of
        casts. 
        

        * delegate.cs (Delegate.Populate): Register the delegage constructor builder here. 

        * ecore.cs: (CopyNewMethods): new utility function used to
        assemble the list of methods from running FindMembers.

        (MemberLookup): Rework FindMembers so that 

2001-12-16  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer): Remove Delegates who fail to be
        defined.

        * delegate.cs (Populate): Verify that we dont get null return
        values.   TODO: Check for AsAccessible.

        * cs-parser.jay: Use basename to emit error 574 (destructor should
        have the same name as container class), not the full name.

        * cs-tokenizer.cs (adjust_int): Fit the integer in the best
        possible representation.  

        Also implements integer type suffixes U and L.

2001-12-15  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (ArrayCreation.DoResolve): We need to do the
        argument resolution *always*.

        * decl.cs: Make this hold the namespace.  Hold the root context as
        well.
        (LookupType): Move here.

        * enum.cs, class.cs, interface.cs: Adapt to new hierarchy.

        * location.cs (Row, Name): Fixed the code, it was always returning
        references to the first file.

        * interface.cs: Register properties defined through interfaces.

        * driver.cs: Add support for globbing on the command line

        * class.cs (Field): Make it derive from MemberCore as well.
        (Event): ditto.

2001-12-15  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Event::Define): Check that the type of the event is a delegate
        type else flag error #66.

        Also, re-use TypeContainer.MethodModifiersValid here too as the rules are the
        same.

        * attribute.cs (DefinePInvokeMethod): Handle named arguments and process
        values of EntryPoint, CharSet etc etc.

        Pass in the values to TypeBuilder.DefinePInvokeMethod; determine Type etc neatly.

        * class.cs (FindMembers): If a method is in transit, its MethodBuilder will
        be null and we should ignore this. I am not sure if this is really clean. Apparently,
        there's no way of avoiding hitting this because the call is coming from SimpleName.DoResolve,
        which needs this to do its work.

        * ../errors/cs0066.cs : Add.

2001-12-14  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs: (GetPropertyGetter, GetPropertyGetter): New
        helper functions.

        * class.cs: (MethodSignature.MethodSignature): Removed hack that
        clears out the parameters field.
        (MemberSignatureCompare): Cleanup

        (MemberCore): New base class used to share code between MethodCore
        and Property.

        (RegisterRequiredImplementations) BindingFlags.Public requires
        either BindingFlags.Instace or Static.  Use instance here.

        (Property): Refactored code to cope better with the full spec.

        * parameter.cs (GetParameterInfo): Return an empty array instead
        of null on error.

        * class.cs (Property): Abstract or extern properties have no bodies.

        * parameter.cs (GetParameterInfo): return a zero-sized array.

        * class.cs (TypeContainer.MethodModifiersValid): Move all the
        method modifier validation to the typecontainer so we can reuse
        this on properties.

        (MethodCore.ParameterTypes): return an empty sized array of types.

        (Property.Define): Test property modifier validity.

        Add tests for sealed/override too.

        (Method.Emit): abstract or extern methods have no bodies.

2001-12-14  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Method.IsPInvoke): Get rid of it as it is an expensive
        thing.

        (Method::Define, ::Emit): Modify accordingly.

        * expression.cs (Invocation::OverloadResolve): Handle error # 121.

        (ArrayCreation::MakeByteBlob): Handle floats and doubles.

        * makefile: Pass in /unsafe.

2001-12-13  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (MakeKey): Kill routine.
        
        * class.cs (TypeContainer.Define): Correctly define explicit
        method implementations (they require the full interface name plus
        the method name).

        * typemanager.cs: Deply the PtrHashtable here and stop using the
        lame keys.  Things work so much better.

        This of course broke everyone who depended on `RegisterMethod' to
        do the `test for existance' test.  This has to be done elsewhere.

        * support.cs (PtrHashtable): A hashtable that avoid comparing with
        the object stupid Equals method (because, that like fails all over
        the place).  We still do not use it.

        * class.cs (TypeContainer.SetRequiredInterface,
        TypeContainer.RequireMethods): Killed these two routines and moved
        all the functionality to RegisterRequiredImplementations.

        (TypeContainer.RegisterRequiredImplementations): This routine now
        registers all the implementations required in an array for the
        interfaces and abstract methods.  We use an array of structures
        which can be computed ahead of time to reduce memory usage and we
        also assume that lookups are cheap as most classes will not
        implement too many interfaces.

        We also avoid creating too many MethodSignatures.

        (TypeContainer.IsInterfaceMethod): Update and optionally does not
        clear the "pending" bit if we find that there are problems with
        the declaration.

        (TypeContainer.VerifyPendingMethods): Update to report errors of
        methods that look like implementations but are not.

        (TypeContainer.Define): Add support for explicit interface method
        implementation. 
        
2001-12-12  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs: Keep track of the parameters here instead of
        being a feature of the TypeContainer.

        * class.cs: Drop the registration of parameters here, as
        InterfaceMethods are also interface declarations.

        * delegate.cs: Register methods with the TypeManager not only with
        the TypeContainer.  This code was buggy.

        * interface.cs: Full registation here.

2001-12-11  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Remove reducer for binary expressions, it can not
        be done this way.

        * const.cs: Put here the code that used to go into constant.cs

        * constant.cs: Put here the code for constants, this is a new base
        class for Literals.

        * literal.cs: Make Literal derive from Constant.

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

        * statement.cs (Return.Emit): Report error 157 if the user
        attempts to return from a finally block.

        (Return.Emit): Instead of emitting a return, jump to the end of
        the function.

        * codegen.cs (EmitContext): ReturnValue, ReturnLabel: new
        LocalBuilder to store the result of the function.  ReturnLabel is
        the target where we jump.
        

2001-12-09  Radek Doulik  <rodo@ximian.com>

        * cs-parser.jay: remember alias in current namespace

        * ecore.cs (SimpleName::DoResolve): use aliases for types or
        namespaces

        * class.cs (LookupAlias): lookup alias in my_namespace

        * namespace.cs (UsingAlias): add alias, namespace_or_type pair to
        aliases hashtable
        (LookupAlias): lookup alias in this and if needed in parent
        namespaces

2001-12-08  Miguel de Icaza  <miguel@ximian.com>

        * support.cs: 

        * rootcontext.cs: (ModuleBuilder) Made static, first step into
        making things static.  I need this to avoid passing the
        TypeContainer when calling ParameterType.

        * support.cs (InternalParameters.ParameterType): Remove ugly hack
        that did string manipulation to compute the type and then call
        GetType.  Use Parameter.ParameterType instead.

        * cs-tokenizer.cs: Consume the suffix for floating values.

        * expression.cs (ParameterReference): figure out whether this is a
        reference parameter or not.  Kill an extra variable by computing
        the arg_idx during emission.

        * parameter.cs (Parameters.GetParameterInfo): New overloaded
        function that returns whether a parameter is an out/ref value or not.

        (Parameter.ParameterType): The type of the parameter (base,
        without ref/out applied).
        
        (Parameter.Resolve): Perform resolution here.
        (Parameter.ExternalType): The full type (with ref/out applied).

        * statement.cs (Using.Emit, Using.EmitExpression): Implement
        support for expressions on the using statement.

2001-12-07  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Using.EmitLocalVariableDecls): Split the
        localvariable handling of the using statement.

        (Block.EmitMeta): Keep track of variable count across blocks.  We
        were reusing slots on separate branches of blocks.

        (Try.Emit): Emit the general code block, we were not emitting it. 

        Check the type of the declaration to be an IDisposable or
        something that can be implicity converted to it. 

        Emit conversions if required.

        * ecore.cs (EmptyExpression): New utility class.
        (Expression.ImplicitConversionExists): New utility function.

2001-12-06  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Using): Implement.

        * expression.cs (LocalVariableReference): Support read only variables.

        * statement.cs: Remove the explicit emit for the Leave opcode.
        (VariableInfo): Add a readonly field.

2001-12-05  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (ConvCast): new class used to encapsulate the various
        explicit integer conversions that works in both checked and
        unchecked contexts.

        (Expression.ConvertNumericExplicit): Use new ConvCast class to
        properly generate the overflow opcodes.

2001-12-04  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs: The correct type for the EmptyExpression is the
        element_type, not the variable type.  Ravi pointed this out.

2001-12-04  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Method::Define): Handle PInvoke methods specially
        by using DefinePInvokeMethod instead of the usual one.

        * attribute.cs (DefinePInvokeMethod): Implement as this is what is called
        above to do the task of extracting information and defining the method.
        
2001-12-04  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation::EmitStaticInitializers): Get rid
        of the condition for string type.

        (Emit): Move that here. 

        (ArrayCreation::CheckIndices): Keep string literals in their expression
        form.

        (EmitDynamicInitializers): Handle strings appropriately.

2001-12-04  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs (EmitContext): Replace multiple variables with a
        single pointer to the current Switch statement.

        * statement.cs (GotoDefault, Switch): Adjust to cleaned up
        EmitContext.

2001-12-03  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs 

        * statement.cs (GotoDefault), cs-parser.jay: Implement `goto
        default'.
        
        (Foreach.Emit): Foreach on arrays was not setting
        up the loop variables (for break/continue).

        (GotoCase): Semi-implented.
        
2001-12-03  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (CheckAttribute): Handle system attributes by using
        Attribute.GetAttributes to examine information we need.

        (GetValidPlaces): Same here.

        * class.cs (Method::Define): Catch invalid use of extern and abstract together.

        * typemanager.cs (dllimport_type): Core type for System.DllImportAttribute.

        * class.cs (Method.IsPinvoke): Used to determine if we are a PInvoke method.

        (Method::Define): Set appropriate flags if we have a DllImport attribute.

        (Method::Emit): Handle the case when we are a PInvoke method.

2001-12-03  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Use ResolveWithSimpleName on compound names.

2001-12-02  Ravi Pratap  <ravi@ximian.com>

        * constant.cs (EmitConstant): Make sure we resolve the associated expression
        before trying to reduce it.

        * typemanager.cs (RegisterConstant, LookupConstant): Implement.

        * constant.cs (LookupConstantValue): Implement.

        (EmitConstant): Use the above in emitting the constant.

        * expression.cs (MemberAccess::ResolveMemberAccess): Handle constants
        that are user-defined by doing a LookupConstantValue on them.

        (SimpleName::DoResolve): When we have a FieldExpr, cope with constants
        too, like above.

2001-11-29  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (BaseAccess, BaseIndexer): Also split this out.

        (BaseAccess.DoResolve): Implement.

        (MemberAccess.DoResolve): Split this routine into a
        ResolveMemberAccess routine that can be used independently

2001-11-28  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Probe, Is, As): Split Probe in two classes Is and
        As that share bits of the implementation.  Is returns a boolean,
        while As returns the Type that is being probed.

2001-12-01  Ravi Pratap  <ravi@ximian.com>

        * enum.cs (LookupEnumValue): Re-write various bits, return an object value
        instead of a Literal - much easier.

        (EnumInTransit): Remove - utterly useless :-)

        (Populate): Re-write bits - remove duplicate code etc. The code is much neater now.

        * expression.cs (MemberLookup): Cope with user-defined enums when they are in transit.

        * enum.cs (LookupEnumValue): Auto-compute next values by going down the dependency
        chain when we have no associated expression.

2001-11-30  Ravi Pratap  <ravi@ximian.com>

        * constant.cs (Define): Use Location while reporting the errror.

        Also emit a warning when 'new' is used and there is no inherited
        member to hide.

        * enum.cs (EnumInTransit): Used to tell if an enum type is in the process of being 
        populated.

        (LookupEnumValue): Implement to lookup an enum member's value and define it
        if necessary.

        (Populate): Re-write accordingly to use the above routine.

2001-11-27  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (This): Fix prototype for DoResolveLValue to
        override the base class DoResolveLValue.

        * cs-parser.cs: Report errors cs574 and cs575 (destructor
        declarations) 

        * ecore.cs (FieldExpr.EmitAssign): Handle value types specially
        (we need to load the address of the field here).  This fixes
        test-22. 
        
        (FieldExpr.DoResolveLValue): Call the DoResolve
        function to initialize the Instance expression.
        
        * statement.cs (Foreach.Emit): Fix the bug where we did not invoke
        correctly the GetEnumerator operation on a value type.

        * cs-parser.jay: Add more simple parsing error catches.

        * statement.cs (Switch): Add support for string switches.
        Handle null specially.

        * literal.cs (NullLiteral): Make NullLiteral objects singletons. 

2001-11-28  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (local_constant_declaration): Use declare_local_constant.

        (declare_local_constant): New helper function.

        * statement.cs (AddConstant): Keep a separate record of constants

        (IsConstant): Implement to determine if a variable is a constant.

        (GetConstantExpression): Implement.

        * expression.cs (LocalVariableReference): Handle the case when it is a constant.

        * statement.cs (IsVariableDefined): Re-write.

2001-11-27  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::FindMembers): Look for constants
        in the case when we are looking for MemberTypes.Field

        * expression.cs (MemberAccess::DoResolve): Check that in the
        case we are a FieldExpr and a Literal, we are not being accessed
        by an instance reference.

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

        (declaration_statement): Implement for constant declarations.

2001-11-26  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Switch): Catch double defaults.

        (Switch): More work on the switch() statement
        implementation.  It works for integral values now, need to finish
        string support.


2001-11-24  Miguel de Icaza  <miguel@ximian.com>

        * ecore.cs (Expression.ConvertIntLiteral): New function to convert
        integer literals into other integer literals.  To be used by
        switch. 

2001-11-24  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation): Get rid of ArrayExprs : we save
        some memory.

        (EmitDynamicInitializers): Cope with the above since we extract data
        directly from ArrayData now.

        (ExpectInitializers): Keep track of whether initializers are mandatory
        or not.

        (Bounds): Make it a hashtable to prevent the same dimension being 
        recorded for every element in that dimension.

        (EmitDynamicInitializers): Fix bug which prevented the Set array method
        from being found.

        Also fix bug which was causing the indices to be emitted in the reverse
        order.

2001-11-24  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (ArrayCreation): Implement the bits that Ravi left
        unfinished.  They do not work, because the underlying code is
        sloppy.

2001-11-22  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Remove bogus fixme.

        * statement.cs (Switch, SwitchSection, SwithLabel): Started work
        on Switch statement.
        
2001-11-23  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (IsDelegateType, IsEnumType): Fix logic to determine
        the same. 
        
        * expression.cs (ArrayCreation::CheckIndices): Get rid of the require_constant
        parameter. Apparently, any expression is allowed. 

        (ValidateInitializers): Update accordingly.

        (CheckIndices): Fix some tricky bugs thanks to recursion.

        * delegate.cs (NewDelegate::DoResolve): Re-write large portions as 
        I was being completely brain-dead.

        (VerifyMethod, VerifyApplicability, VerifyDelegate): Make static
        and re-write acordingly.

        (DelegateInvocation): Re-write accordingly.

        * expression.cs (ArrayCreation::Emit): Handle string initialization separately.

        (MakeByteBlob): Handle types more correctly.

        * expression.cs (ArrayCreation:Emit): Write preliminary code to do
        initialization from expressions but it is incomplete because I am a complete
        Dodo :-|

2001-11-22  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (If.Emit): Fix a bug that generated incorrect code
        on If.  Basically, we have to return `true' (ie, we do return to
        our caller) only if both branches of the if return.

        * expression.cs (Binary.Emit): LogicalOr and LogicalAnd are
        short-circuit operators, handle them as short circuit operators. 

        (Cast.DoResolve): Resolve type.
        (Cast.Cast): Take an expression as the target type.

        * cs-parser.jay (cast_expression): Remove old hack that only
        allowed a limited set of types to be handled.  Now we take a
        unary_expression and we resolve to a type during semantic
        analysis.

        Use the grammar productions from Rhys to handle casts (this is
        not complete like Rhys syntax yet, we fail to handle that corner
        case that C# has regarding (-x), but we will get there.
        
2001-11-22  Ravi Pratap  <ravi@ximian.com>

        * class.cs (EmitFieldInitializer): Take care of the case when we have a
        field which is an array type.

        * cs-parser.jay (declare_local_variables): Support array initialization too.

        * typemanager.cs (MakeKey): Implement.

        (everywhere): Use the above appropriately.

        * cs-parser.jay (for_statement): Update for array initialization while
        declaring variables.

        * ecore.cs : The error message was correct, it's the variable's names that
        were misleading ;-) Make the code more readable.

        (MemberAccess::DoResolve): Fix the code which handles Enum literals to set
        the correct type etc.

        (ConvertExplicit): Handle Enum types by examining the underlying type.

2001-11-21  Ravi Pratap  <ravi@ximian.com>

        * parameter.cs (GetCallingConvention): Always return
        CallingConventions.Standard for now.

2001-11-22  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Binary.ResolveOperator): Update the values of `l'
        and `r' after calling DoNumericPromotions.

        * ecore.cs: Fix error message (the types were in the wrong order).

        * statement.cs (Foreach.ProbeCollectionType): Need to pass
        BindingFlags.Instance as well 

        * ecore.cs (Expression.TryImplicitIntConversion): Wrap the result
        implicit int literal conversion in an empty cast so that we
        propagate the right type upstream.

        (UnboxCast): new class used to unbox value types.
        (Expression.ConvertExplicit): Add explicit type conversions done
        by unboxing.

        (Expression.ImplicitNumericConversion): Oops, forgot to test for
        the target type before applying the implicit LongLiterals to ULong
        literal cast.

2001-11-21  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay (for_statement): Reworked the way For works: now
        we declare manually any variables that are introduced in
        for_initializer to solve the problem of having out-of-band code
        emition (that is what got for broken).

        (declaration_statement): Perform the actual variable declaration
        that used to be done in local_variable_declaration here.

        (local_variable_declaration): Do not declare anything, just pass
        the information on a DictionaryEntry

2001-11-20  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation::CheckIndices): The story continues :-) Complete
        re-write of the logic to now make it recursive.

        (UpdateIndices): Re-write accordingly.

        Store element data in a separate ArrayData list in the above methods.

        (MakeByteBlob): Implement to dump the array data into a byte array.

2001-11-19  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation): Factor out some code from ValidateInitializers
        into CheckIndices.

        * constant.cs (Define): Implement.

        (EmitConstant): Re-write fully.

        Pass in location info.

        * class.cs (Populate, Emit): Call Constant::Define and Constant::EmitConstant
        respectively.

        * cs-parser.jay (constant_declarator): Use VariableDeclaration instead of
        DictionaryEntry since we need location info too.

        (constant_declaration): Update accordingly.

        * expression.cs (ArrayCreation): Make ValidateInitializers simpler by factoring
        code into another method : UpdateIndices.

2001-11-18  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation::ValidateInitializers): Update to perform
        some type checking etc.

2001-11-17  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation::ValidateInitializers): Implement
        bits to provide dimension info if the user skips doing that.

        Update second constructor to store the rank correctly.

2001-11-16  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ArrayCreation::ValidateInitializers): Poke around
        and try to implement.

        * ../errors/cs0150.cs : Add.

        * ../errors/cs0178.cs : Add.

2001-11-16  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs: Implement foreach on multi-dimensional arrays. 

        * parameter.cs (Parameters.GetParameterByName): Also lookup the
        name of the params argument.

        * expression.cs: Use EmitStoreOpcode to get the right opcode while
        initializing the array.

        (ArrayAccess.EmitStoreOpcode): move the opcode generation here, so
        we can use this elsewhere.

        * statement.cs: Finish implementation of foreach for single
        dimension arrays.

        * cs-parser.jay: Use an out-of-band stack to pass information
        around, I wonder why I need this.

        foreach_block: Make the new foreach_block the current_block.

        * parameter.cs (Parameters.GetEmptyReadOnlyParameters): New
        function used to return a static Parameters structure.  Used for
        empty parameters, as those are created very frequently.

        * cs-parser.jay, class.cs: Use GetEmptyReadOnlyParameters

2001-11-15  Ravi Pratap  <ravi@ximian.com>

        * interface.cs : Default modifier is private, not public. The
        make verify test passes again.

2001-11-15  Ravi Pratap  <ravi@ximian.com>

        * support.cs (ReflectionParameters): Fix logic to determine
        whether the last parameter is a params one. Test 9 passes again.

        * delegate.cs (Populate): Register the builders we define with
        RegisterParameterForBuilder. Test 19 passes again.

        * cs-parser.jay (property_declaration): Reference $6 instead
        of $$ to get at the location.

        (indexer_declaration): Similar stuff.

        (attribute): Ditto.

        * class.cs (Property): Register parameters for the Get and Set methods
        if they exist. Test 23 passes again.

        * expression.cs (ArrayCreation::Emit): Pass null for the method in the
        call to EmitArguments as we are sure there aren't any params arguments. 
        Test 32 passes again.

        * suppor.cs (ParameterDesc, ParameterModifier): Fix trivial bug causing
        IndexOutOfRangeException. 

        * class.cs (Property::Define): Register property using TypeManager.RegisterProperty
        Test 33 now passes again.
        
2001-11-15  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Kill horrendous hack ($??? = lexer.Location) that
        broke a bunch of things.  Will have to come up with a better way
        of tracking locations.

        * statement.cs: Implemented foreach for single dimension arrays.

2001-11-09  Miguel de Icaza  <miguel@ximian.com>

        * enum.cs (Enum.Emit): Delay the lookup of loc until we run into
        an error.  This removes the lookup from the critical path.

        * cs-parser.jay: Removed use of temporary_loc, which is completely
        broken. 

2001-11-14  Miguel de Icaza  <miguel@ximian.com>

        * support.cs (ReflectionParameters.ParameterModifier): Report
        whether the argument is a PARAMS argument or not.

        * class.cs: Set the attribute `ParamArrayAttribute' on the
        parameter argument.

        * typemanager.cs: Define param_array_type (ParamArrayAttribute)
        and cons_param_array_attribute (ConstructorInfo for
        ParamArrayAttribute)., 

        * codegen.cs: Emit the return using the `Return' statement, that
        way we can report the error correctly for missing return values. 

        * class.cs (Method.Emit): Clean up.

        * expression.cs (Argument.Resolve): Take another argument: the
        location where this argument is used.  Notice that this is not
        part of the "Argument" class as to reduce the size of the
        structure (we know the approximate location anyways).

        Test if the argument is a variable-reference, if not, then
        complain with a 206.

        (Argument.Emit): Emit addresses of variables.

        (Argument.FullDesc): Simplify.

        (Invocation.DoResolve): Update for Argument.Resolve.

        (ElementAccess.DoResolve): ditto.

        * delegate.cs (DelegateInvocation.Emit): Invocation of Invoke
        method should be virtual, as this method is always virtual.

        (NewDelegate.DoResolve): Update for Argument.Resolve.

        * class.cs (ConstructorInitializer.DoResolve): ditto.
        
        * attribute.cs (Attribute.Resolve): ditto.

2001-11-13  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Foreach.Emit): Use EmitAssign instead of Store.

        * expression.cs (ParameterReference): Drop IStackStorage and implement
        IAssignMethod instead. 

        (LocalVariableReference): ditto.
        
        * ecore.cs (FieldExpr): Drop IStackStorage and implement
        IAssignMethod instead. 

2001-11-13  Miguel de Icaza <miguel@ximian.com>

        * parameter.cs, expression.cs, class.cs, ecore.cs: Made all
        enumerations that are used in heavily used structures derive from
        byte in a laughable and pathetic attempt to reduce memory usage.
        This is the kind of pre-optimzations that you should not do at
        home without adult supervision.

        * expression.cs (UnaryMutator): New class, used to handle ++ and
        -- separatedly from the other unary operators.  Cleans up the
        code, and kills the ExpressionStatement dependency in Unary.

        (Unary): Removed `method' and `Arguments' from this class, making
        it smaller, and moving it all to SimpleCall, so I can reuse this
        code in other locations and avoid creating a lot of transient data
        strucutres when not required.

        * cs-parser.jay: Adjust for new changes.

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

        * enum.cs (Enum.Populate): If there is a failure during
        definition, return

        * cs-parser.jay (opt_enum_base): we used to catch type errors
        here, but this is really incorrect.  The type error should be
        catched during semantic analysis.

2001-12-11  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (operator_declarator, conversion_operator_declarator): Set
        current_local_parameters as expected since I, in my stupidity, had forgotten
        to do this :-)

        * attribute.cs (GetValidPlaces): Fix stupid bug.

        * class.cs (Method::Emit): Perform check on applicability of attributes.

        (Constructor::Emit): Ditto.

        (Field::Emit): Ditto.

        (Field.Location): Store location information.

        (Property, Event, Indexer, Operator): Ditto.

        * cs-parser.jay (field_declaration): Pass in location for each field.

        * ../errors/cs0592.cs : Add.

2001-11-12  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (attribute_usage_type): New static member for System.AttributeUsage.

        (InitCoreTypes): Update accordingly.

        (RegisterAttrType, LookupAttr): Implement.

        * attribute.cs (Attribute.Targets, AllowMultiple, Inherited): New fields to hold
        info about the same.

        (Resolve): Update to populate the above as necessary.

        (Error592): Helper.

        (GetValidPlaces): Helper to the above.

        (CheckAttribute): Implement to perform validity of attributes on declarative elements.

        * class.cs (TypeContainer::Emit): Update attribute emission code to perform checking etc.

2001-11-12  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (Attribute::Resolve): Expand to handle named arguments too.

        * ../errors/cs0617.cs : Add.

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

        * enum.cs (Emit): Rename to Populate to be more consistent with what
        we expect it to do and when exactly it is called.

        * class.cs, rootcontext.cs : Update accordingly.

        * typemanager.cs (RegisterField, GetValue): Workarounds for the fact that
        FieldInfo.GetValue does not work on dynamic types ! S.R.E lameness strikes again !

        * enum.cs (Populate): Register fields with TypeManager.RegisterField.

        * expression.cs (MemberAccess.DoResolve): Adjust code to obtain the value
        of a fieldinfo using the above, when dealing with a FieldBuilder.

2001-11-10  Ravi Pratap  <ravi@ximian.com>

        * ../errors/cs0031.cs : Add.

        * ../errors/cs1008.cs : Add.

        * ../errrors/cs0543.cs : Add.

        * enum.cs (DefineEnum): Check the underlying type and report an error if not a valid
        enum type.

        (FindMembers): Implement.

        * typemanager.cs (FindMembers): Re-write to call the appropriate methods for
        enums and delegates too.

        (enum_types): Rename to builder_to_enum.

        (delegate_types): Rename to builder_to_delegate.

        * delegate.cs (FindMembers): Implement.

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

        * typemanager.cs (IsEnumType): Implement.

        * enum.cs (Emit): Re-write parts to account for the underlying type
        better and perform checking etc.

        (GetNextDefaultValue): Helper to ensure we don't overshoot max value
        of the underlying type.

        * literal.cs (GetValue methods everywhere): Perform bounds checking and return
        value

        * enum.cs (error31): Helper to report error #31.

        * cs-parser.jay (enum_declaration): Store location of each member too.

        * enum.cs (member_to_location): New hashtable. 

        (AddEnumMember): Update location hashtable.

        (Emit): Use the location of each member while reporting errors.

2001-11-09  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: A for_initializer if is a
        local_variable_declaration really ammount to have an implicit
        block with the variable declaration and no initializer for for.

        * statement.cs (For.Emit): Cope with null initializers.

        This fixes the infinite loop on for initializers.

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

        * enum.cs: More cleanup.

        * ecore.cs: Remove dead code.

        * class.cs (Property.Emit): More simplification.
        (Event.Emit): ditto.

        Reworked to have less levels of indentation.
        
2001-11-08  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Property): Emit attributes.

        (Field): Ditto.
        
        (Event): Ditto.

        (Indexer): Ditto.

        (Operator): Ditto.

        * enum.cs (Emit): Ditto.

        * rootcontext.cs (ResolveTree, EmitCode, CloseTypes): Do the same for
        Enums too.

        * class.cs (Field, Event, etc.): Move attribute generation into the
        Emit method everywhere.

        * enum.cs (Enum): Revamp to use the same definition semantics as delegates so
        we have a DefineEnum, CloseEnum etc. The previous way of doing things was not right
        as we had no way of defining nested enums !

        * rootcontext.cs : Adjust code accordingly.

        * typemanager.cs (AddEnumType): To keep track of enum types separately.

2001-11-07  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (EvalConstantExpression): Move into ecore.cs
        
        * enum.cs (Enum): Rename some members and make them public and readonly
        according to our convention.

        * modifiers.cs (EnumAttr): Implement as we need to set only visibility flags,
        nothing else.

        * enum.cs (Enum::Define): Use the above instead of TypeAttr.

        (Enum::Emit): Write a simple version for now which doesn't try to compute
        expressions. I shall modify this to be more robust in just a while.

        * class.cs (TypeContainer::Emit): Make sure we include Enums too.

        (TypeContainer::CloseType): Create the Enum types too.

        * attribute.cs (Resolve): Use the new Reduce method instead of EvalConstantExpression.

        * expression.cs (EvalConstantExpression): Get rid of completely.

        * enum.cs (Enum::Emit): Use the new expression reducer. Implement assigning
        user-defined values and other cases.

        (IsValidEnumLiteral): Helper function.

        * expression.cs (ExprClassfromMemberInfo): Modify to not do any literalizing 
        out there in the case we had a literal FieldExpr.

        (MemberAccess:DoResolve): Do the literalizing of the FieldExpr here.

        (Literalize): Revamp a bit to take two arguments.
        
        (EnumLiteral): New class which derives from Literal to wrap enum literals.
        
2001-11-06  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (compilation_unit): Remove extra opt_attributes for now.

        * expression.cs (ArrayCreation::ValidateInitializers): Implement.

        (Resolve): Use the above to ensure we have proper initializers.

2001-11-05  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Expression::EvalConstantExpression): New method to 
        evaluate constant expressions.

        * attribute.cs (Attribute::Resolve): Modify bits to use the above function.

2001-11-07  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (ArrayCreation.Emit): Some bits to initialize data
        in an array.

        (Binary.ResolveOperator): Handle operator != (object a, object b)
        and operator == (object a, object b);

        (Binary.DoNumericPromotions): Indicate whether the numeric
        promotion was possible.

        (ArrayAccess.DoResolve, ArrayAccess.Emit, ArrayAccess.EmitAssign):
        Implement.  

        Made the ArrayAccess implement interface IAssignMethod instead of
        IStackStore as the order in which arguments are passed reflects
        this.

        * assign.cs: Instead of using expr.ExprClass to select the way of
        assinging, probe for the IStackStore/IAssignMethod interfaces.

        * typemanager.cs: Load InitializeArray definition.

        * rootcontext.cs (RootContext.MakeStaticData): Used to define
        static data that can be used to initialize arrays. 

2001-11-05  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Handle operator== and operator!= for booleans.

        (Conditioal.Reduce): Implement reducer for the ?: operator.

        (Conditional.Resolve): Implement dead code elimination.

        (Binary.Resolve): Catch string literals and return a new
        concatenated string.

        (Unary.Reduce): Implement reduction of unary expressions.

        * ecore.cs: Split out the expression core handling here.

        (Expression.Reduce): New method used to perform constant folding
        and CSE.  This is needed to support constant-expressions. 
        
        * statement.cs (Statement.EmitBoolExpression): Pass true and false
        targets, and optimize for !x.

2001-11-04  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (Attribute::Resolve): Implement guts. Note that resolution
        of an attribute gives us a CustomAttributeBuilder which we use accordingly to
        set custom atttributes.

        * literal.cs (Literal::GetValue): New abstract method to return the actual
        value of the literal, cast as an object.

        (*Literal): Implement GetValue method.

        * cs-parser.jay (positional_argument_list, named_argument_list): Add not just plain
        expressions to the arraylist but objects of type Argument.

        * class.cs (TypeContainer::Emit): Emit our attributes too.

        (Method::Emit, Constructor::Emit): Ditto.

        * cs-parser.jay (constructor_declaration): Set attributes too, which we seemed
        to be ignoring earlier.

2001-11-03  Ravi Pratap  <ravi@ximian.com>

        * attribute.cs (AttributeSection::Define): Implement to do the business
        of constructing a CustomAttributeBuilder.

        (Attribute): New trivial class. Increases readability of code.  

        * cs-parser.jay : Update accordingly.

        (positional_argument_list, named_argument_list, named_argument): New rules

        (attribute_arguments): Use the above so that we are more correct.
        
2001-11-02  Ravi Pratap  <ravi@ximian.com>
        
        * expression.cs (Invocation::IsParamsMethodApplicable): Implement
        to perform all checks for a method with a params parameter.

        (Invocation::OverloadResolve): Update to use the above method and therefore
        cope correctly with params method invocations.

        * support.cs (InternalParameters::ParameterDesc): Provide a desc for 
        params too.

        * class.cs (ConstructorInitializer::Resolve): Make sure we look for Non-public
        constructors in our parent too because we can't afford to miss out on 
        protected ones ;-)

        * attribute.cs (AttributeSection): New name for the class Attribute

        Other trivial changes to improve readability.

        * cs-parser.jay (opt_attributes, attribute_section etc.): Modify to
        use the new class names.
        
2001-11-01  Ravi Pratap  <ravi@ximian.com>

        * class.cs (Method::Define): Complete definition for params types too

        (Indexer::Define): Ditto.

        * support.cs (InternalParameters::ParameterType, ParameterDesc, ParameterModifier):
        Cope everywhere with a request for info about the array parameter.

2001-11-01  Ravi Pratap  <ravi@ximian.com>

        * tree.cs (RecordNamespace): Fix up to check for the correct key.

        * cs-parser.jay (GetQualifiedIdentifier): New Helper method used in 
        local_variable_type to extract the string corresponding to the type.

        (local_variable_type): Fixup the action to use the new helper method.

        * codegen.cs : Get rid of RefOrOutParameter, it's not the right way to 
        go.

        * expression.cs : Clean out code which uses the above.

2001-10-31  Ravi Pratap  <ravi@ximian.com>
        
        * typemanager.cs (RegisterMethod): Check if we already have an existing key
        and bale out if necessary by returning a false.

        (RegisterProperty): Ditto.

        * class.cs (everywhere): Check the return value from TypeManager.RegisterMethod
        and print out appropriate error messages.

        * interface.cs (everywhere): Ditto.

        * cs-parser.jay (property_declaration, event_declaration, indexer_declaration): Pass
        location to constructor.

        * class.cs (Property, Event, Indexer): Update accordingly.

        * ../errors/cs111.cs : Added.

        * expression.cs (Invocation::IsApplicable): New static method to determine applicability
        of a method, as laid down by the spec.

        (Invocation::OverloadResolve): Use the above method.

2001-10-31  Ravi Pratap  <ravi@ximian.com>

        * support.cs (InternalParameters): Get rid of crap taking in duplicate info. We
        now take a TypeContainer and a Parameters object.

        (ParameterData): Modify return type of ParameterModifier method to be 
        Parameter.Modifier and not a string.

        (ReflectionParameters, InternalParameters): Update accordingly.

        * expression.cs (Argument::GetParameterModifier): Same here.

        * support.cs (InternalParameters::ParameterType): Find a better way of determining
        if we are a ref/out parameter. Actually, the type shouldn't be holding the '&'
        symbol in it at all so maybe this is only for now.

2001-10-30  Ravi Pratap  <ravi@ximian.com>

        * support.cs (InternalParameters): Constructor now takes an extra argument 
        which is the actual Parameters class.

        (ParameterDesc): Update to provide info on ref/out modifiers.

        * class.cs (everywhere): Update call to InternalParameters to pass in
        the second argument too.

        * support.cs (ParameterData): Add ParameterModifier, which is a method 
        to return the modifier info [ref/out etc]

        (InternalParameters, ReflectionParameters): Implement the above.

        * expression.cs (Argument::ParameterModifier): Similar function to return
        info about the argument's modifiers.

        (Invocation::OverloadResolve): Update to take into account matching modifiers 
        too.

        * class.cs (Indexer::Define): Actually define a Parameter object and put it onto
        a new SetFormalParameters object which we pass to InternalParameters.

2001-10-30  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (NewArray): Merge into the ArrayCreation class.

2001-10-29  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (NewArray): Merge classes NewBuiltinArray and 
        NewUserdefinedArray into one as there wasn't much of a use in having
        two separate ones.

        * expression.cs (Argument): Change field's name to ArgType from Type.

        (Type): New readonly property which returns the proper type, taking into 
        account ref/out modifiers.

        (everywhere): Adjust code accordingly for the above.

        * codegen.cs (EmitContext.RefOrOutParameter): New field to determine
        whether we are emitting for a ref or out parameter.

        * expression.cs (Argument::Emit): Use the above field to set the state.

        (LocalVariableReference::Emit): Update to honour the flag and emit the
        right stuff.

        * parameter.cs (Attributes): Set the correct flags for ref parameters.

        * expression.cs (Argument::FullDesc): New function to provide a full desc.

        * support.cs (ParameterData): Add method ParameterDesc to the interface.

        (ReflectionParameters, InternalParameters): Implement the above method.

        * expression.cs (Invocation::OverloadResolve): Use the new desc methods in
        reporting errors.

        (Invocation::FullMethodDesc): Ditto. 

2001-10-29  Miguel de Icaza  <miguel@ximian.com>

        * cs-parser.jay: Add extra production for the second form of array
        creation. 

        * expression.cs (ArrayCreation): Update to reflect the above
        change. 

        * Small changes to prepare for Array initialization.

2001-10-28  Miguel de Icaza  <miguel@ximian.com>

        * typemanager.cs (ImplementsInterface): interface might be null;
        Deal with this problem;

        Also, we do store negative hits on the cache (null values), so use
        this instead of calling t.GetInterfaces on the type everytime.

2001-10-28  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (IsBuiltinType): New method to help determine the same.

        * expression.cs (New::DoResolve): Get rid of array creation code and instead
        split functionality out into different classes.

        (New::FormArrayType): Move into NewBuiltinArray.

        (Invocation::EmitArguments): Get rid of the MethodBase argument. Appears
        quite useless.

        (NewBuiltinArray): New class to handle creation of built-in arrays.

        (NewBuiltinArray::DoResolve): Implement guts of array creation. Also take into
        account creation of one-dimensional arrays.

        (::Emit): Implement to use Newarr and Newobj opcodes accordingly.

        (NewUserdefinedArray::DoResolve): Implement.

        * cs-parser.jay (local_variable_type): Fix up to add the rank to the variable too.

        * typemanager.cs (AddModule): Used to add a ModuleBuilder to the list of modules
        we maintain inside the TypeManager. This is necessary to perform lookups on the
        module builder.

        (LookupType): Update to perform GetType on the module builders too.     

        * driver.cs (Driver): Add the ModuleBuilder to the list maintained by the TypeManager.

        * exprssion.cs (NewUserdefinedArray::Emit): Implement.

2001-10-23  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (New::DoResolve): Implement guts of array creation.

        (New::FormLookupType): Rename to FormArrayType and modify ever so slightly.
        
2001-10-27  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Fix bug I introduced lsat night that broke
        Delegates. 

        (Expression.Resolve): Report a 246 error (can not resolve name)
        if we find a SimpleName in the stream.
        
        (Expression.ResolveLValue): Ditto.
        
        (Expression.ResolveWithSimpleName): This function is a variant of
        ResolveName, this one allows SimpleNames to be returned without a
        warning.  The only consumer of SimpleNames is MemberAccess

2001-10-26  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Invocation::DoResolve): Catch SimpleNames that
        might arrive here.  I have my doubts that this is correct.

        * statement.cs (Lock): Implement lock statement.

        * cs-parser.jay: Small fixes to support `lock' and `using'

        * cs-tokenizer.cs: Remove extra space

        * driver.cs: New flag --checked, allows to turn on integer math
        checking. 

        * typemanger.cs: Load methodinfos for Threading.Monitor.Enter and
        Threading.Monitor.Exit 
        
2001-10-23  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (IndexerAccess::DoResolveLValue): Set the
        Expression Class to be IndexerAccess.

        Notice that Indexer::DoResolve sets the eclass to Value.

2001-10-22  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer::Emit): Emit code for indexers.

        * assign.cs (IAssignMethod): New interface implemented by Indexers
        and Properties for handling assignment.

        (Assign::Emit): Simplify and reuse code. 
        
        * expression.cs (IndexerAccess, PropertyExpr): Implement
        IAssignMethod, clean up old code. 

2001-10-22  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (ImplementsInterface): New method to determine if a type
        implements a given interface. Provides a nice cache too.

        * expression.cs (ImplicitReferenceConversion): Update checks to use the above
        method.

        (ConvertReferenceExplicit): Ditto.

        * delegate.cs (Delegate::Populate): Update to define the parameters on the 
        various methods, with correct names etc.

        * class.cs (Operator::OpType): New members Operator.UnaryPlus and 
        Operator.UnaryNegation.

        * cs-parser.jay (operator_declarator): Be a little clever in the case where
        we have a unary plus or minus operator.

        * expression.cs (Unary): Rename memebers of Operator enum to UnaryPlus and 
        UnaryMinus.

        * everywhere : update accordingly.

        * everywhere : Change Negate and BitComplement to LogicalNot and OnesComplement
        respectively.

        * class.cs (Method::Define): For the case where we are implementing a method
        inherited from an interface, we need to set the MethodAttributes.Final flag too. 
        Also set MethodAttributes.NewSlot and MethodAttributes.HideBySig.
        
2001-10-21  Ravi Pratap  <ravi@ximian.com>

        * interface.cs (FindMembers): Implement to work around S.R.E
        lameness.

        * typemanager.cs (IsInterfaceType): Implement.

        (FindMembers): Update to handle interface types too.

        * expression.cs (ImplicitReferenceConversion): Re-write bits which
        use IsAssignableFrom as that is not correct - it doesn't work.

        * delegate.cs (DelegateInvocation): Derive from ExpressionStatement
        and accordingly override EmitStatement.

        * expression.cs (ConvertReferenceExplicit): Re-write similary, this time
        using the correct logic :-)

2001-10-19  Ravi Pratap  <ravi@ximian.com>

        * ../errors/cs-11.cs : Add to demonstrate error -11 

2001-10-17  Miguel de Icaza  <miguel@ximian.com>

        * assign.cs (Assign::Resolve): Resolve right hand side first, and
        then pass this as a hint to ResolveLValue.
        
        * expression.cs (FieldExpr): Add Location information

        (FieldExpr::LValueResolve): Report assignment to readonly
        variable. 
        
        (Expression::ExprClassFromMemberInfo): Pass location information.

        (Expression::ResolveLValue): Add new method that resolves an
        LValue. 

        (Expression::DoResolveLValue): Default invocation calls
        DoResolve. 

        (Indexers): New class used to keep track of indexers in a given
        Type. 

        (IStackStore): Renamed from LValue, as it did not really describe
        what this did.  Also ResolveLValue is gone from this interface and
        now is part of Expression.

        (ElementAccess): Depending on the element access type
        
        * typemanager.cs: Add `indexer_name_type' as a Core type
        (System.Runtime.CompilerServices.IndexerNameAttribute)

        * statement.cs (Goto): Take a location.
        
2001-10-18  Ravi Pratap  <ravi@ximian.com>

        * delegate.cs (Delegate::VerifyDelegate): New method to verify
        if two delegates are compatible.

        (NewDelegate::DoResolve): Update to take care of the case when
        we instantiate a delegate from another delegate.

        * typemanager.cs (FindMembers): Don't even try to look up members
        of Delegate types for now.

2001-10-18  Ravi Pratap  <ravi@ximian.com>

        * delegate.cs (NewDelegate): New class to take care of delegate
        instantiation.

        * expression.cs (New): Split the delegate related code out into 
        the NewDelegate class.

        * delegate.cs (DelegateInvocation): New class to handle delegate 
        invocation.

        * expression.cs (Invocation): Split out delegate related code into
        the DelegateInvocation class.

2001-10-17  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (New::DoResolve): Implement delegate creation fully
        and according to the spec.

        (New::DoEmit): Update to handle delegates differently.

        (Invocation::FullMethodDesc): Fix major stupid bug thanks to me
        because of which we were printing out arguments in reverse order !

        * delegate.cs (VerifyMethod): Implement to check if the given method
        matches the delegate.

        (FullDelegateDesc): Implement.

        (VerifyApplicability): Implement.

        * expression.cs (Invocation::DoResolve): Update to accordingly handle
        delegate invocations too.

        (Invocation::Emit): Ditto.

        * ../errors/cs1593.cs : Added.

        * ../errors/cs1594.cs : Added.

        * delegate.cs (InstanceExpression, TargetMethod): New properties.

2001-10-16  Ravi Pratap  <ravi@ximian.com>

        * typemanager.cs (intptr_type): Core type for System.IntPtr

        (InitCoreTypes): Update for the same.

        (iasyncresult_type, asynccallback_type): Ditto.

        * delegate.cs (Populate): Fix to use System.Intptr as it is indeed
        correct.

        * typemanager.cs (AddDelegateType): Store a pointer to the Delegate class
        too.

        * delegate.cs (ConstructorBuilder, InvokeBuilder, ...): New members to hold
        the builders for the 4 members of a delegate type :-)

        (Populate): Define the BeginInvoke and EndInvoke methods on the delegate
        type.

        * expression.cs (New::DoResolve): Implement guts for delegate creation.

        * ../errors/errors.txt : Update for an error (-11) which only we catch :-)

2001-10-15  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs (Break::Emit): Implement.   
        (Continue::Emit): Implement.

        (For::Emit): Track old being/end loops;  Set Begin loop, ack end loop
        (While::Emit): Track old being/end loops;  Set Begin loop, ack end loop
        (Do::Emit): Track old being/end loops;  Set Begin loop, ack end loop
        (Foreach::Emit): Track old being/end loops;  Set Begin loop, ack
        end loop
        
        * codegen.cs (EmitContext::LoopEnd, EmitContext::LoopBegin): New
        properties that track the label for the current loop (begin of the
        loop and end of the loop).

2001-10-15  Ravi Pratap  <ravi@ximian.com>

        * delegate.cs (Emit): Get rid of it as there doesn't seem to be any ostensible
        use of emitting anything at all.

        * class.cs, rootcontext.cs : Get rid of calls to the same.

        * delegate.cs (DefineDelegate): Make sure the class we define is also sealed.

        (Populate): Define the constructor correctly and set the implementation
        attributes.

        * typemanager.cs (delegate_types): New hashtable to hold delegates that
        have been defined.

        (AddDelegateType): Implement.

        (IsDelegateType): Implement helper method.

        * delegate.cs (DefineDelegate): Use AddDelegateType instead of AddUserType.

        * expression.cs (New::DoResolve): Check if we are trying to instantiate a delegate type
        and accordingly handle it.

        * delegate.cs (Populate): Take TypeContainer argument.
        Implement bits to define the Invoke method. However, I still haven't figured out
        how to take care of the native int bit :-(

        * cs-parser.jay (delegate_declaration): Fixed the bug that I had introduced :-) 
        Qualify the name of the delegate, not its return type !

        * expression.cs (ImplicitReferenceConversion): Implement guts of implicit array
        conversion.

        (StandardConversionExists): Checking for array types turns out to be recursive.

        (ConvertReferenceExplicit): Implement array conversion.

        (ExplicitReferenceConversionExists): New method to determine precisely that :-)
        
2001-10-12  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (delegate_declaration): Store the fully qualified
        name as it is a type declaration.

        * delegate.cs (ReturnType, Name): Rename members to these. Make them 
        readonly.

        (DefineDelegate): Renamed from Define. Does the same thing essentially,
        as TypeContainer::DefineType.

        (Populate): Method in which all the definition of the various methods (Invoke)
        etc is done.

        (Emit): Emit any code, if necessary. I am not sure about this really, but let's
        see.
        
        (CloseDelegate): Finally creates the delegate.

        * class.cs (TypeContainer::DefineType): Update to define delegates.
        (Populate, Emit and CloseType): Do the same thing here too.

        * rootcontext.cs (ResolveTree, PopulateTypes, EmitCode, CloseTypes): Include
        delegates in all these operations.

2001-10-14  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: LocalTemporary: a new expression used to
        reference a temporary that has been created.

        * assign.cs: Handle PropertyAccess back here, so that we can
        provide the proper semantic access to properties.

        * expression.cs (Expression::ConvertReferenceExplicit): Implement
        a few more explicit conversions. 

        * modifiers.cs: `NEW' modifier maps to HideBySig.

        * expression.cs (PropertyExpr): Make this into an
        ExpressionStatement, and support the EmitStatement code path. 

        Perform get/set error checking, clean up the interface.

        * assign.cs: recognize PropertyExprs as targets, and if so, turn
        them into toplevel access objects.

2001-10-12  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: PropertyExpr::PropertyExpr: use work around the
        SRE.

        * typemanager.cs: Keep track here of our PropertyBuilders again to
        work around lameness in SRE.

2001-10-11  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (LValue::LValueResolve): New method in the
        interface, used to perform a second resolution pass for LValues. 
        
        (This::DoResolve): Catch the use of this in static methods.

        (This::LValueResolve): Implement.

        (This::Store): Remove warning, assigning to `this' in structures
        is 

        (Invocation::Emit): Deal with invocation of
        methods on value types.  We need to pass the address to structure
        methods rather than the object itself.  (The equivalent code to
        emit "this" for structures leaves the entire structure on the
        stack instead of a pointer to it). 

        (ParameterReference::DoResolve): Compute the real index for the
        argument based on whether the method takes or not a `this' pointer
        (ie, the method is static).

        * codegen.cs (EmitContext::GetTemporaryStorage): Used to store
        value types returned from functions when we need to invoke a
        method on the sturcture.
        

2001-10-11  Ravi Pratap  <ravi@ximian.com>

        * class.cs (TypeContainer::DefineType): Method to actually do the business of
        defining the type in the Modulebuilder or Typebuilder. This is to take
        care of nested types which need to be defined on the TypeBuilder using
        DefineNestedMethod.

        (TypeContainer::GetClassBases): Implement. Essentially the code from the 
        methods in RootContext, only ported to be part of TypeContainer.

        (TypeContainer::GetInterfaceOrClass): Ditto.

        (TypeContainer::LookupInterfaceOrClass, ::MakeFQN): Ditto.

        * interface.cs (Interface::DefineInterface): New method. Does exactly
        what RootContext.CreateInterface did earlier, only it takes care of nested types 
        too.

        (Interface::GetInterfaces): Move from RootContext here and port.

        (Interface::GetInterfaceByName): Same here.

        * rootcontext.cs (ResolveTree): Re-write.

        (PopulateTypes): Re-write.

        * class.cs (TypeContainer::Populate): Populate nested types too.
        (TypeContainer::Emit): Emit nested members too.

        * typemanager.cs (AddUserType): Do not make use of the FullName property,
        instead just use the name argument passed in as it is already fully
        qualified.

        (FindMembers): Check in the Builders to TypeContainer mapping instead of the name
        to TypeContainer mapping to see if a type is user-defined.

        * class.cs (TypeContainer::CloseType): Implement. 

        (TypeContainer::DefineDefaultConstructor): Use Basename, not Name while creating
        the default constructor.
        
        (TypeContainer::Populate): Fix minor bug which led to creating default constructors
        twice.

        (Constructor::IsDefault): Fix up logic to determine if it is the default constructor

        * interface.cs (CloseType): Create the type here.
        
        * rootcontext.cs (CloseTypes): Re-write to recursively close types by running through
        the hierarchy.

        Remove all the methods which are now in TypeContainer.

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

        * delegate.cs (Define): Re-write bits to define the delegate
        correctly.

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

        * makefile: Renamed the compiler to `mcs.exe' instead of compiler.exe

        * expression.cs (ImplicitReferenceConversion): handle null as well
        as a source to convert to any reference type.

        * statement.cs (Return): Perform any implicit conversions to
        expected return type.  

        Validate use of return statement.  

        * codegen.cs (EmitContext): Pass the expected return type here.

        * class.cs (Method, Constructor, Property): Pass expected return
        type to EmitContext.

2001-10-09  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs: Make DoResolve take an EmitContext instead of a
        TypeContainer.

        Replaced `l' and `location' for `loc', for consistency.
        
        (Error, Warning): Remove unneeded Tc argument.

        * assign.cs, literal.cs, constant.cs: Update to new calling
        convention. 
        
        * codegen.cs: EmitContext now contains a flag indicating whether
        code is being generated in a static method or not.

        * cs-parser.jay: DecomposeQI, new function that replaces the old
        QualifiedIdentifier.  Now we always decompose the assembled
        strings from qualified_identifier productions into a group of
        memberaccesses.

2001-10-08  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs: Deal with field-less struct types correctly now
        by passing the size option to Define Type.

        * class.cs: Removed hack that created one static field. 

2001-10-07  Miguel de Icaza  <miguel@ximian.com>

        * statement.cs: Moved most of the code generation here. 

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

        * expression.cs (New::DoResolve): Revert changes for array creation, doesn't
        seem very right.

        (ElementAccess): Remove useless bits for now - keep checks as the spec
        says.

2001-10-08  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (ElementAccess::DoResolve): Remove my crap code
        and start performing checks according to the spec.

2001-10-07  Ravi Pratap  <ravi@ximian.com>

        * cs-parser.jay (type_suffix*): Remove - they are redundant. Use
        rank_specifiers instead.

        (rank_specifiers): Change the order in which the rank specifiers are stored

        (local_variable_declaration): Use opt_rank_specifier instead of type_suffixes.

        * expression.cs (ElementAccess): Implement the LValue interface too.
        
2001-10-06  Ravi Pratap  <ravi@ximian.com>
        
        * expression.cs (ConvertExplicitStandard): Add. Same as ConvertExplicit
        except that user defined conversions are not included.

        (UserDefinedConversion): Update to use the ConvertExplicitStandard to 
        perform the conversion of the return type, if necessary.

        (New::DoResolve): Check whether we are creating an array or an object
        and accordingly do the needful.

        (New::Emit): Same here.

        (New::DoResolve): Implement guts of array creation.

        (New::FormLookupType): Helper function.

2001-10-07  Miguel de Icaza  <miguel@ximian.com>

        * codegen.cs: Removed most of the code generation here, and move the
        corresponding code generation bits to the statement classes. 

        Added support for try/catch/finalize and throw.
        
        * cs-parser.jay: Added support for try/catch/finalize.

        * class.cs: Catch static methods having the flags override,
        virtual or abstract.

        * expression.cs (UserCast): This user cast was not really doing
        what it was supposed to do.  Which is to be born in fully resolved
        state.  Parts of the resolution were being performed at Emit time! 

        Fixed this code.

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

        * expression.cs: Implicity convert the result from UserCast.

2001-10-05  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Expression::FindMostEncompassingType): Fix bug which
        prevented it from working correctly. 

        (ConvertExplicit): Make the first try, a call to ConvertImplicitStandard, not
        merely ConvertImplicit.

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

        * typemanager.cs: Make the LookupTypeContainer function static,
        and not per-instance.  

        * class.cs: Make static FindMembers (the one that takes a Type
        argument). 

        * codegen.cs: Add EmitForeach here.

        * cs-parser.jay: Make foreach a toplevel object instead of the
        inline expansion, as we need to perform semantic analysis on it. 

2001-10-05  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Expression::ImplicitUserConversion): Rename to
        UserDefinedConversion.

        (Expression::UserDefinedConversion): Take an extra argument specifying 
        whether we look for explicit user conversions too.

        (Expression::ImplicitUserConversion): Make it a call to UserDefinedConversion.

        (UserDefinedConversion): Incorporate support for user defined explicit conversions.

        (ExplicitUserConversion): Make it a call to UserDefinedConversion
        with the appropriate arguments.

        * cs-parser.jay (cast_expression): Record location too.

        * expression.cs (Cast): Record location info.

        (Expression::ConvertExplicit): Take location argument.

        (UserImplicitCast): Change name to UserCast. Take an extra constructor argument
        to determine if we are doing explicit conversions.

        (UserCast::Emit): Update accordingly.

        (Expression::ConvertExplicit): Report an error if everything fails.

        * ../errors/cs0030.cs : Add.

2001-10-04  Miguel de Icaza  <miguel@ximian.com>

        * modifiers.cs: If the ABSTRACT keyword is present, also set the
        virtual and newslot bits. 

        * class.cs (TypeContainer::RegisterRequiredImplementations):
        Record methods we need.

        (TypeContainer::MakeKey): Helper function to make keys for
        MethodBases, since the Methodbase key is useless.

        (TypeContainer::Populate): Call RegisterRequiredImplementations
        before defining the methods.   

        Create a mapping for method_builders_to_methods ahead of time
        instead of inside a tight loop.

        (::RequireMethods):  Accept an object as the data to set into the
        hashtable so we can report interface vs abstract method mismatch.

2001-10-03  Miguel de Icaza  <miguel@ximian.com>

        * report.cs: Make all of it static.

        * rootcontext.cs: Drop object_type and value_type computations, as
        we have those in the TypeManager anyways.

        Drop report instance variable too, now it is a global.

        * driver.cs: Use try/catch on command line handling.

        Add --probe option to debug the error reporting system with a test
        suite. 

        * report.cs: Add support for exiting program when a probe
        condition is reached.

2001-10-03  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Binary::DoNumericPromotions): Fix the case when
        we do a forcible conversion regardless of type, to check if 
        ForceConversion returns a null.

        (Binary::error19): Use location to report error.

        (Unary::error23): Use location here too.

        * ../errors/cs0019.cs : Check in.

        * ../errors/cs0023.cs : Check in.

        * expression.cs (Expression.MemberLookup): Return null for a rather esoteric
        case of a non-null MethodInfo object with a length of 0 !

        (Binary::ResolveOperator): Flag error if overload resolution fails to find
        an applicable member - according to the spec :-)
        Also fix logic to find members in base types.

        (Unary::ResolveOperator): Same here.

        (Unary::report23): Change name to error23 and make first argument a TypeContainer
        as I was getting thoroughly confused between this and error19 :-)
        
        * expression.cs (Expression::ImplicitUserConversion): Re-write fully
        (::FindMostEncompassedType): Implement.
        (::FindMostEncompassingType): Implement.
        (::StandardConversionExists): Implement.

        (UserImplicitCast): Re-vamp. We now need info about most specific
        source and target types so that we can do the necessary conversions.

        (Invocation::MakeUnionSet): Completely re-write to make sure we form a proper
        mathematical union with no duplicates.

2001-10-03  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs (RootContext::PopulateTypes): Populate containers
        in order from base classes to child classes, so that we can in
        child classes look up in our parent for method names and
        attributes (required for handling abstract, virtual, new, override
        constructs: we need to instrospect our base class, and if we dont
        populate the classes in order, the introspection might be
        incorrect.  For example, a method could query its parent before
        the parent has any methods and would determine that the parent has
        no abstract methods (while it could have had them)).

        (RootContext::CreateType): Record the order in which we define the
        classes.

2001-10-02  Miguel de Icaza  <miguel@ximian.com>

        * class.cs (TypeContainer::Populate): Also method definitions can
        fail now, keep track of this.

        (TypeContainer::FindMembers): Implement support for
        DeclaredOnly/noDeclaredOnly flag.

        (Constructor::Emit) Return the ConstructorBuilder.

        (Method::Emit) Return the MethodBuilder. 
        Check for abstract or virtual methods to be public.

        * rootcontext.cs (RootContext::CreateType): Register all the
        abstract methods required for the class to be complete and the
        interface methods that must be implemented. 

        * cs-parser.jay: Report error 501 (method requires body if it is
        not marked abstract or extern).

        * expression.cs (TypeOf::Emit): Implement.

        * typemanager.cs: runtime_handle_type, new global type.

        * class.cs (Property::Emit): Generate code for properties.

2001-10-02  Ravi Pratap  <ravi@ximian.com>

        * expression.cs (Unary::ResolveOperator): Find operators on base type
        too - we now conform exactly to the spec.

        (Binary::ResolveOperator): Same here.

        * class.cs (Operator::Define): Fix minor quirk in the tests.

        * ../errors/cs0215.cs : Added.

        * ../errors/cs0556.cs : Added.

        * ../errors/cs0555.cs : Added.

2001-10-01  Miguel de Icaza  <miguel@ximian.com>

        * cs-tokenizer.cs: Reimplemented Location to be a struct with a
        single integer which is really efficient

2001-10-01  Ravi Pratap  <ravi@ximian.com>

        *  expression.cs (Expression::ImplicitUserConversion): Use location
        even in the case when we are examining True operators.
 
        * class.cs (Operator::Define): Perform extensive checks to conform
        with the rules for operator overloading in the spec.

        * expression.cs (Expression::ImplicitReferenceConversion): Implement
        some of the other conversions mentioned in the spec.

        * typemanager.cs (array_type): New static member for the System.Array built-in
        type.

        (cloneable_interface): For System.ICloneable interface.

        * driver.cs (Driver::Driver): Initialize TypeManager's core types even before
        we start resolving the tree and populating types.

        * ../errors/errors.txt : Update for error numbers -7, -8, -9, -10
 
2001-10-01  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (Expression::ExprClassFromMemberInfo,
        Expression::Literalize): Create literal expressions from
        FieldInfos which are literals.

        (ConvertNumericExplicit, ImplicitNumericConversion): Fix a few
        type casts, because they were wrong.  The test suite in tests
        caught these ones.

        (ImplicitNumericConversion): ushort to ulong requires a widening
        cast. 

        Int32 constant to long requires widening cast as well.

        * literal.cs (LongLiteral::EmitLong): Do not generate i4 constants
        for integers because the type on the stack is not i4.

2001-09-30  Miguel de Icaza  <miguel@ximian.com>

        * expression.cs (report118): require location argument. 

        * parameter.cs: Do not dereference potential null value.

        * class.cs: Catch methods that lack the `new' keyword when
        overriding a name.  Report warnings when `new' is used without
        anything being there to override.

        * modifiers.cs: Handle `NEW' as MethodAttributes.NewSlot.

        * class.cs: Only add constructor to hashtable if it is non-null
        (as now constructors can fail on define).

        (TypeManager, Class, Struct): Take location arguments.

        Catch field instance initialization in structs as errors.

        accepting_filter: a new filter for FindMembers that is static so
        that we dont create an instance per invocation.

        (Constructor::Define): Catch errors where a struct constructor is
        parameterless 

        * cs-parser.jay: Pass location information for various new
        constructs. 
        
        * delegate.cs (Delegate): take a location argument.

        * driver.cs: Do not call EmitCode if there were problesm in the
        Definition of the types, as many Builders wont be there. 

        * decl.cs (Decl::Decl): Require a location argument.

        * cs-tokenizer.cs: Handle properly hex constants that can not fit
        into integers, and find the most appropiate integer for it.

        * literal.cs: Implement ULongLiteral.

        * rootcontext.cs: Provide better information about the location of
        failure when CreateType fails.
        
2001-09-29  Miguel de Icaza  <miguel@ximian.com>

        * rootcontext.cs (RootContext::PopulateTypes): Populates structs
        as well.

        * expression.cs (Binary::CheckShiftArguments): Add missing type
        computation.
        (Binary::ResolveOperator): Add type to the logical and and logical
        or, Bitwise And/Or and Exclusive Or code paths, it was missing
        before.

        (Binary::DoNumericPromotions): In the case where either argument
        is ulong (and most signed types combined with ulong cause an
        error) perform implicit integer constant conversions as well.

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

        * expression.cs (UserImplicitCast): Method should always be
        non-null. 
        (Invocation::BetterConversion): Simplified test for IntLiteral.

        (Expression::ImplicitNumericConversion): Split this routine out.
        Put the code that performs implicit constant integer conversions
        here. 

        (Expression::Resolve): Become a wrapper around DoResolve so we can
        check eclass and type being set after resolve.

        (Invocation::Badness): Remove this dead function

        (Binary::ResolveOperator): Do not compute the expensive argumnets
        unless we have a union for it.

        (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.