[eglib] make g_mkdir_with_parents work for paths not ending in /

[mono.git] / mcs / mcs / TODO

diff --git a/mcs/mcs/TODO b/mcs/mcs/TODO
index f71c29fa02b64634e34cf746c0ab161255eff2af..1abb0382b7bdc02b935afae54b8f06a9774130fe 100644 (file)
--- a/mcs/mcs/TODO
+++ b/mcs/mcs/TODO
@@ -1,27 +1,54 @@
-Error Reporting:
-----------------
+===========================================

 
 

-       * Make yyerror show a nice syntax error, instead of the current mess.
+* Value Parameter

 
 

-Iterators
----------
-       * `yield' is no longer a keyword, it only has special
-         meaning before a return or break keywords.
+       I believe that `Value Parameter' might have been introduced
+       after C# 1.0, also notice than in the treatment of Value Parameter
+       the parameters are defined in four categories:

 
 

-       * Study side effects with assign
-       * Study TemporaryStorage/LocalStorage -> Merge/rename
+       Section 9.3 in the latest spec.

 
 

-       * Reset should throw not implemented now.

 
 

-Instance idea
--------------
+Large project:
+--------------
+
+New
+---
+
+       It would be nice to optimize the case of:
+
+               Method (new ValueType ())
+
+       So that no temporary is created, and we only use a newobj call
+       that remains on the stack, as opposed to ldloca, initobj, ldloc
+       call.
+
+NEW NOTES:
+----------
+
+       ImplicitStandardConversionExists and ImplicitStandardConversion
+       should always be the same, but there are a few diverging lines that
+       must be studied:
+
+                       if (expr_type == target_type && !(expr is NullLiteral))
+                               return expr;

 
 

-       It would be nice to have things that can be "instances" to have an
-       EmitInstance method (this would default to nothing).
+       vs:

 
 

-       The idea is to be able to use efficiently the instance data on stack
-       manipulations, as opposed to the current scheme, where we basically have
-       a few special cases.
+                       if (expr_type == target_type)
+                               return true;
+
+****************************************************************************************
+* 
+*   The information on the rest of this file is mostly outdated, and its kept here for
+*   historical reasons
+*
+****************************************************************************************
+ 
+Error Reporting:
+----------------
+
+       * Make yyerror show a nice syntax error, instead of the current mess.

 
 Optimization ideas
 ------------------
 
 Optimization ideas
 ------------------


@@ -48,21 +75,6 @@ Optimization ideas
                        | thing_list thing { Pair p = $1; $$ = new Pair ($2, $1); }
 
 
                        | thing_list thing { Pair p = $1; $$ = new Pair ($2, $1); }
 
 

-Anonymous Methods
------------------
-
-       Plan:
-
-               * Resolve anonymous methods before.
-               * Each time a Local matches, if the mode is `InAnonymous', flag
-                 the VariableInfo for `proxying'.
-               * During Resolve track the depth required for local variables.
-               * Before Emit, create proxy classes with proper depth.
-               * Emit.
-
-Open question:
-               Create a toplevel block for anonymous methods?  
-

 EmitContext.ResolveTypeTree
 ---------------------------
 
 EmitContext.ResolveTypeTree
 ---------------------------
 


@@ -90,174 +102,12 @@ DeclareLocal audit
 
        This is required to fix foreach in iterators.
 
 
        This is required to fix foreach in iterators.
 

-Large project:
---------------
-
-       Drop FindMembers as our API and instead extract all the data
-       out of a type the first time into our own datastructures, and
-       use that to navigate and search the type instead of the
-       callback based FindMembers.     
-
-       Martin has some some of this work with his TypeHandle code
-       that we could use for this.
-
-Notes on memory allocation
---------------------------
-
-       Outdated:
-
-       A run of the AllocationProfile shows that the compiler allocates roughly
-       30 megabytes of strings.  From those, 20 megabytes come from
-       LookupType.  
-
-       See the notes on current_container problems below on memory usage.  
-
-LookupTypeReflection:
----------------------
-
-       With something like `System.Object', LookupTypeReflection will be called
-       twice: once to find out that `System' is not a type and once
-       for System.Object.
-
-       This is required because System.Reflection requires that the type/nested types are
-       not separated by a dot but by a plus sign.
-
-       A nested class would be My+Class (My being the toplevel, Class the nested one).
-
-       It is interesting to look at the most called lookups when bootstrapping MCS:
-
-    647        LTR: ArrayList
-    713        LTR: System.Globalization
-    822        LTR: System.Object+Expression
-    904        LTR: Mono.CSharp.ArrayList
-    976        LTR: System.Runtime.CompilerServices
-    999        LTR: Type
-   1118        LTR: System.Runtime
-   1208        LTR: Mono.CSharp.Type
-   1373        LTR: Mono.Languages
-   1599        LTR: System.Diagnostics
-   2036        LTR: System.Text
-   2302        LTR: System.Reflection.Emit
-   2515        LTR: System.Collections
-   4527        LTR: System.Reflection
-  22273        LTR: Mono.CSharp
-  24245        LTR: System
-  27005        LTR: Mono
-
-       Analysis:
-               The top 9 lookups are done for things which are not types.
-
-               Mono.CSharp.Type happens to be a common lookup: the class Type
-               used heavily in the compiler in the default namespace.
-
-               RED FLAG:
-
-               Then `Type' is looked up alone a lot of the time, this happens
-               in parameter declarations and am not entirely sure that this is
-               correct (FindType will pass to LookupInterfaceOrClass a the current_type.FullName,
-               which for some reason is null!).  This seems to be a problem with a lost
-               piece of context during FindType.
-
-               System.Object is also used a lot as a toplevel class, and we assume it will
-               have children, we should just shortcut this.
-
-    A cache:
-
-       Adding a cache and adding a catch for `System.Object' to flag that it wont be the
-       root of a hierarchy reduced the MCS bootstrap time from 10.22 seconds to 8.90 seconds.
-
-       This cache is currently enabled with SIMPLE_SPEEDUP in typemanager.cs.  Memory consumption
-       went down from 74 megs to 65 megs with this change.  
-

 Ideas:
 ------
 
        Instead of the hack that *knows* about System.Object not having any children classes,
        we should just make it simple for a probe to know that there is no need for it.
 
 Ideas:
 ------
 
        Instead of the hack that *knows* about System.Object not having any children classes,
        we should just make it simple for a probe to know that there is no need for it.
 

-The use of DottedName
----------------------
-
-       We could probably use a different system to represent names, like this:
-
-       class Name {
-               string simplename;
-               Name parent;
-       }
-
-       So `System.ComponentModel' becomes:
-
-               x: (System, null)
-               y: (ComponentModel, x)
-
-       The problem is that we would still need to construct the name to pass to
-       GetType.
-
-       This has been now implemented, its called "QualifiedIdentifier"
-
-current_container/current_namespace and the DeclSpace
------------------------------------------------------
-
-       We are storing fully qualified names in the DeclSpace instead of the node,
-       this is because `current_namespace' (Namepsace) is not a DeclSpace like
-       `current_container'.
-
-       The reason for storing the full names today is this:
-
-       namespace X {
-               class Y {
-               }
-       }
-
-       namespace A {
-               class Y {
-               }
-       }
-
-       The problem is that we only use the namespace stack to track the "prefix"
-       for typecontainers, but they are not typecontainers themselves, so we have
-       to use fully qualified names, because both A.X and A.Y would be entered
-       in the toplevel type container.  If we use the short names, there would be
-       a name clash.
-
-       To fix this problem, we have to make namespaces DeclSpaces.
-
-       The full size, contrasted with the size that could be stored is:
-               corlib:
-                       Size of strings held: 368901
-                       Size of strings short: 147863
-
-               System:
-                       Size of strings held: 212677
-                       Size of strings short: 97521
-               
-               System.XML:
-                       Size of strings held: 128055
-                       Size of strings short: 35782
-               
-               System.Data:
-                       Size of strings held: 117896
-                       Size of strings short: 36153
-               
-               System.Web:
-                       Size of strings held: 194527
-                       Size of strings short: 58064
-               
-               System.Windows.Forms:
-                       Size of strings held: 220495
-                       Size of strings short: 64923
-
-       
-TODO:
-
-       1. Create a "partial" emit context for each TypeContainer..
-
-       2. EmitContext should be partially constructed.  No IL Generator.
-
-       interface_type review.
-
-       parameter_array, line 952: `note: must be a single dimension array type'.  Validate this
-

 Dead Code Elimination bugs:
 ---------------------------
 
 Dead Code Elimination bugs:
 ---------------------------
 


@@ -265,30 +115,13 @@ Dead Code Elimination bugs:
 
 Major tasks:
 ------------
 
 Major tasks:
 ------------

-
-       Pinned and volatile require type modifiers that can not be encoded
-       with Reflection.Emit.
-

        Properties and 17.6.3: Finish it.
 
        Properties and 17.6.3: Finish it.
 

-       Implement base indexer access.
-

 readonly variables and ref/out
        
 BUGS
 ----
 
 readonly variables and ref/out
        
 BUGS
 ----
 

-* Check for Final when overriding, if the parent is Final, then we cant
-  allow an override.
-
-* Interface indexers
-
-       I have not figured out why the Microsoft version puts an
-       `instance' attribute, and I am not generating this `instance' attribute.
-
-       Explanation: The reason for the `instance' attribute on
-       indexers is that indexers only apply to instances
-

 * Break/Continue statements
 
        A finally block should reset the InLoop/LoopBegin/LoopEnd, as
 * Break/Continue statements
 
        A finally block should reset the InLoop/LoopBegin/LoopEnd, as


@@ -299,13 +132,6 @@ BUGS
        They should transfer control to the finally block if inside a try/catch
        block.
 
        They should transfer control to the finally block if inside a try/catch
        block.
 

-* Method Registration and error CS111
-
-       The way we use the method registration to signal 111 is wrong.
-       
-       Method registration should only be used to register methodbuilders,
-       we need an alternate method of checking for duplicates.
-

 *
 > // CSC sets beforefieldinit
 > class X {
 *
 > // CSC sets beforefieldinit
 > class X {


@@ -320,11 +146,6 @@ PENDING TASKS
 
 * Merge test 89 and test-34
 
 
 * Merge test 89 and test-34
 

-* Revisit
-
-       Primary-expression, as it has now been split into 
-       non-array-creation-expression and array-creation-expression.
-               

 * Code cleanup
 
        The information when registering a method in InternalParameters
 * Code cleanup
 
        The information when registering a method in InternalParameters


@@ -334,12 +155,6 @@ PENDING TASKS
 
        Handle modreq from public apis.
 
 
        Handle modreq from public apis.
 

-* Emit `pinned' for pinned local variables.
-
-       Both `modreq' and pinned will require special hacks in the compiler.
-
-* Make sure that we are pinning the right variable
-

 * Merge tree.cs, rootcontext.cs
 
 OPTIMIZATIONS
 * Merge tree.cs, rootcontext.cs
 
 OPTIMIZATIONS


@@ -363,31 +178,11 @@ OPTIMIZATIONS
        The only pending problem is that the code that implements Aliases
        is on TypeContainer, and probably should go in DeclSpace.
 
        The only pending problem is that the code that implements Aliases
        is on TypeContainer, and probably should go in DeclSpace.
 

-* Use of local temporary in UnaryMutator
-
-       We should get rid of the Localtemporary there for some cases
-
-       This turns out to be very complex, at least for the post-version,
-       because this case:
-
-               a = i++
-
-       To produce optimal code, it is necessary for UnaryMutator to know 
-       that it is being assigned to a variable (the way the stack is laid
-       out using dup requires the store to happen inside UnaryMutator).
-

 * Tests
 
        Write tests for the various reference conversions.  We have
        test for all the numeric conversions.
 
 * Tests
 
        Write tests for the various reference conversions.  We have
        test for all the numeric conversions.
 

-* Optimizations
-
-       In Indexers and Properties, probably support an EmitWithDup
-       That emits the code to call Get and then leaves a this pointer
-       in the stack, so that later a Store can be emitted using that
-       this pointer (consider Property++ or Indexer++)
-

 * Optimizations: variable allocation.
 
        When local variables of a type are required, we should request
 * Optimizations: variable allocation.
 
        When local variables of a type are required, we should request


@@ -426,8 +221,3 @@ RECOMMENDATIONS
        Notice how numbering of the arguments changes as the
        { oob_stack.Push (lexer.Location) } takes a "slot"  in the productions.
 
        Notice how numbering of the arguments changes as the
        { oob_stack.Push (lexer.Location) } takes a "slot"  in the productions.
 

-* local_variable_declaration
-
-       Not sure that this grammar is correct, we might have to
-       resolve this during semantic analysis.
-