Clenup few checks.
[mono.git] / mcs / mcs / eval.cs
index a450d6b5186df1c7754add6b76748b531f4a7a5c..6782d573a406830981cd1b06a90daff32eae586c 100644 (file)
@@ -11,7 +11,7 @@
 //
 using System;
 using System.Threading;
-using System.Collections;
+using System.Collections.Generic;
 using System.Reflection;
 using System.Reflection.Emit;
 using System.IO;
@@ -54,12 +54,12 @@ namespace Mono.CSharp {
                static string current_debug_name;
                static int count;
                static Thread invoke_thread;
-               
-               static ArrayList using_alias_list = new ArrayList ();
-               internal static ArrayList using_list = new ArrayList ();
-               static Hashtable fields = new Hashtable ();
 
-               static Type   interactive_base_class = typeof (InteractiveBase);
+               static List<NamespaceEntry.UsingAliasEntry> using_alias_list = new List<NamespaceEntry.UsingAliasEntry> ();
+               internal static List<NamespaceEntry.UsingEntry> using_list = new List<NamespaceEntry.UsingEntry> ();
+               static Dictionary<string, Tuple<FieldSpec, FieldInfo>> fields = new Dictionary<string, Tuple<FieldSpec, FieldInfo>> ();
+
+               static TypeSpec interactive_base_class;
                static Driver driver;
                static bool inited;
 
@@ -85,6 +85,10 @@ namespace Mono.CSharp {
                        InitAndGetStartupFiles (args);
                }
 
+               internal static ReportPrinter SetPrinter (ReportPrinter report_printer)
+               {
+                       return ctx.Report.SetPrinter (report_printer);
+               }                               
 
                /// <summary>
                ///   Optional initialization for the Evaluator.
@@ -117,18 +121,22 @@ namespace Mono.CSharp {
                                
                                driver.ProcessDefaultConfig ();
 
-                               ArrayList startup_files = new ArrayList ();
+                               var startup_files = new List<string> ();
                                foreach (CompilationUnit file in Location.SourceFiles)
                                        startup_files.Add (file.Path);
                                
                                CompilerCallableEntryPoint.Reset ();
                                RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
+                               /*var ctypes = */TypeManager.InitCoreTypes ();
 
+                               Import.Initialize ();
                                driver.LoadReferences ();
+                               TypeManager.InitOptionalCoreTypes (ctx);
+
                                RootContext.EvalMode = true;
                                inited = true;
 
-                               return (string []) startup_files.ToArray (typeof (string));
+                               return startup_files.ToArray ();
                        }
                }
 
@@ -140,11 +148,16 @@ namespace Mono.CSharp {
                static void Reset ()
                {
                        CompilerCallableEntryPoint.PartialReset ();
+                       RootContext.PartialReset ();
                        
                        // Workaround for API limitation where full message printer cannot be passed
-                       ReportPrinter printer = MessageOutput == Console.Out || MessageOutput == Console.Error ?
-                               new ConsoleReportPrinter (MessageOutput) :
-                               new StreamReportPrinter (MessageOutput);
+                       ReportPrinter printer;
+                       if (MessageOutput == Console.Out || MessageOutput == Console.Error){
+                               var console_reporter = new ConsoleReportPrinter (MessageOutput);
+                               console_reporter.Fatal = driver.fatal_errors;
+                               printer = console_reporter;
+                       } else
+                               printer = new StreamReportPrinter (MessageOutput);
 
                        ctx = new CompilerContext (new Report (printer));
                        RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
@@ -152,9 +165,9 @@ namespace Mono.CSharp {
                        //
                        // PartialReset should not reset the core types, this is very redundant.
                        //
-                       if (!TypeManager.InitCoreTypes (ctx))
-                               throw new Exception ("Failed to InitCoreTypes");
-                       TypeManager.InitOptionalCoreTypes (ctx);
+//                     if (!TypeManager.InitCoreTypes (ctx, null))
+//                             throw new Exception ("Failed to InitCoreTypes");
+//                     TypeManager.InitOptionalCoreTypes (ctx);
                        
                        Location.AddFile (null, "{interactive}");
                        Location.Initialize ();
@@ -180,18 +193,22 @@ namespace Mono.CSharp {
                ///   base class and the static members that are
                ///   available to your evaluated code.
                /// </remarks>
-               static public Type InteractiveBaseClass {
+               static public TypeSpec InteractiveBaseClass {
                        get {
-                               return interactive_base_class;
+                               if (interactive_base_class != null)
+                                       return interactive_base_class;
+
+                               return Import.ImportType (typeof (InteractiveBase));
                        }
+               }
 
-                       set {
-                               if (value == null)
-                                       throw new ArgumentNullException ();
+               public static void SetInteractiveBaseClass (Type type)
+               {
+                       if (type == null)
+                               throw new ArgumentNullException ();
 
-                               lock (evaluator_lock)
-                                       interactive_base_class = value;
-                       }
+                       lock (evaluator_lock)
+                               interactive_base_class = Import.ImportType (type);
                }
 
                /// <summary>
@@ -305,7 +322,7 @@ namespace Mono.CSharp {
                        // Either null (on error) or the compiled method.
                        return compiled;
                }
-               
+
                //
                // Todo: Should we handle errors, or expect the calling code to setup
                // the recording themselves?
@@ -351,7 +368,7 @@ namespace Mono.CSharp {
                        // The code execution does not need to keep the compiler lock
                        //
                        object retval = typeof (NoValueSet);
-                       
+
                        try {
                                invoke_thread = System.Threading.Thread.CurrentThread;
                                invoking = true;
@@ -428,7 +445,7 @@ namespace Mono.CSharp {
                                        } catch (CompletionResult cr){
                                                prefix = cr.BaseText;
                                                return cr.Result;
-                                       }
+                                       } 
                                } finally {
                                        parser.undo.ExecuteUndo ();
                                }
@@ -610,6 +627,7 @@ namespace Mono.CSharp {
                        partial_input = false;
                        Reset ();
                        queued_fields.Clear ();
+                       Tokenizer.LocatedToken.Initialize ();
 
                        Stream s = new MemoryStream (Encoding.Default.GetBytes (input));
                        SeekableStreamReader seekable = new SeekableStreamReader (s, Encoding.Default);
@@ -650,14 +668,10 @@ namespace Mono.CSharp {
                        if (mode == ParseMode.GetCompletions)
                                parser.Lexer.CompleteOnEOF = true;
 
-                       bool disable_error_reporting;
+                       ReportPrinter old_printer = null;
                        if ((mode == ParseMode.Silent || mode == ParseMode.GetCompletions) && CSharpParser.yacc_verbose_flag == 0)
-                               disable_error_reporting = true;
-                       else
-                               disable_error_reporting = false;
-                       
-                       if (disable_error_reporting)
-                               ctx.Report.DisableReporting ();
+                               old_printer = SetPrinter (new StreamReportPrinter (TextWriter.Null));
+
                        try {
                                parser.parse ();
                        } finally {
@@ -669,8 +683,8 @@ namespace Mono.CSharp {
                                        parser = null;
                                }
 
-                               if (disable_error_reporting)
-                                       ctx.Report.EnableReporting ();
+                               if (old_printer != null)
+                                       SetPrinter (old_printer);
                        }
                        return parser;
                }
@@ -680,7 +694,7 @@ namespace Mono.CSharp {
                // or reflection gets confused (it basically gets confused, and variables override each
                // other).
                //
-               static ArrayList queued_fields = new ArrayList ();
+               static List<Field> queued_fields = new List<Field> ();
                
                //static ArrayList types = new ArrayList ();
 
@@ -721,8 +735,10 @@ namespace Mono.CSharp {
                        }
                        
                        RootContext.EmitCode ();
-                       if (Report.Errors != 0)
+                       if (Report.Errors != 0){
+                               undo.ExecuteUndo ();
                                return null;
+                       }
                        
                        RootContext.CloseTypes ();
 
@@ -736,31 +752,33 @@ namespace Mono.CSharp {
                        // Unlike Mono, .NET requires that the MethodInfo is fetched, it cant
                        // work from MethodBuilders.   Retarded, I know.
                        //
-                       Type tt = CodeGen.Assembly.Builder.GetType (tb.Name);
+                       var tt = CodeGen.Assembly.Builder.GetType (tb.Name);
                        MethodInfo mi = tt.GetMethod (mb.Name);
                        
                        // Pull the FieldInfos from the type, and keep track of them
                        foreach (Field field in queued_fields){
                                FieldInfo fi = tt.GetField (field.Name);
-                               
-                               FieldInfo old = (FieldInfo) fields [field.Name];
+
+                               Tuple<FieldSpec, FieldInfo> old;
                                
                                // If a previous value was set, nullify it, so that we do
                                // not leak memory
-                               if (old != null){
-                                       if (TypeManager.IsStruct (old.FieldType)){
+                               if (fields.TryGetValue (field.Name, out old)) {
+                                       if (old.Item1.MemberType.IsStruct) {
                                                //
                                                // TODO: Clear fields for structs
                                                //
                                        } else {
                                                try {
-                                                       old.SetValue (null, null);
+                                                       old.Item2.SetValue (null, null);
                                                } catch {
                                                }
                                        }
+
+                                       fields [field.Name] = Tuple.Create (old.Item1, fi);
+                               } else {
+                                       fields.Add (field.Name, Tuple.Create (field.Spec, fi));
                                }
-                               
-                               fields [field.Name] = fi;
                        }
                        //types.Add (tb);
 
@@ -783,10 +801,10 @@ namespace Mono.CSharp {
                public class NoValueSet {
                }
 
-               static internal FieldInfo LookupField (string name)
+               static internal Tuple<FieldSpec, FieldInfo> LookupField (string name)
                {
-                       FieldInfo fi =  (FieldInfo) fields [name];
-
+                       Tuple<FieldSpec, FieldInfo> fi;
+                       fields.TryGetValue (name, out fi);
                        return fi;
                }
 
@@ -829,9 +847,9 @@ namespace Mono.CSharp {
                        }
                }
 
-               static internal ICollection GetUsingList ()
+               static internal ICollection<string> GetUsingList ()
                {
-                       ArrayList res = new ArrayList (using_list.Count);
+                       var res = new List<string> (using_list.Count);
                        foreach (object ue in using_list)
                                res.Add (ue.ToString ());
                        return res;
@@ -840,7 +858,7 @@ namespace Mono.CSharp {
                static internal string [] GetVarNames ()
                {
                        lock (evaluator_lock){
-                               return (string []) new ArrayList (fields.Keys).ToArray (typeof (string));
+                               return new List<string> (fields.Keys).ToArray ();
                        }
                }
                
@@ -849,25 +867,19 @@ namespace Mono.CSharp {
                        lock (evaluator_lock){
                                StringBuilder sb = new StringBuilder ();
                                
-                               foreach (DictionaryEntry de in fields){
-                                       FieldInfo fi = LookupField ((string) de.Key);
-                                       object value = null;
-                                       bool error = false;
-                                       
+                               foreach (var de in fields){
+                                       var fi = LookupField (de.Key);
+                                       object value;
                                        try {
-                                               if (value == null)
-                                                       value = "null";
-                                               value = fi.GetValue (null);
+                                               value = fi.Item2.GetValue (null);
                                                if (value is string)
                                                        value = Quote ((string)value);
                                        } catch {
-                                               error = true;
+                                               value = "<error reading value>";
                                        }
-                                       
-                                       if (error)
-                                               sb.Append (String.Format ("{0} {1} <error reading value>", TypeManager.CSharpName(fi.FieldType), de.Key));
-                                       else
-                                               sb.Append (String.Format ("{0} {1} = {2}", TypeManager.CSharpName(fi.FieldType), de.Key, value));
+
+                                       sb.AppendFormat ("{0} {1} = {2}", fi.Item1.MemberType.GetSignatureForError (), de.Key, value);
+                                       sb.AppendLine ();
                                }
                                
                                return sb.ToString ();
@@ -891,11 +903,17 @@ namespace Mono.CSharp {
                static public void ReferenceAssembly (Assembly a)
                {
                        lock (evaluator_lock){
-                               GlobalRootNamespace.Instance.AddAssemblyReference (a);
-                               GlobalRootNamespace.Instance.ComputeNamespaces (ctx);
+//                             GlobalRootNamespace.Instance.AddAssemblyReference (a);
+//                             GlobalRootNamespace.Instance.ComputeNamespaces (ctx);
+                               GlobalRootNamespace.Instance.ImportAssembly (a);
                        }
                }
-               
+
+               /// <summary>
+               ///   If true, turns type expressions into valid expressions
+               ///   and calls the describe method on it
+               /// </summary>
+               public static bool DescribeTypeExpressions;
        }
 
        
@@ -1032,17 +1050,17 @@ namespace Mono.CSharp {
                /// </summary>
                static public string help {
                        get {
-                               return  "Static methods:\n"+
-                                       "  Describe(obj)      - Describes the object's type\n" + 
-                                       "  LoadPackage (pkg); - Loads the given Package (like -pkg:FILE)\n" +
-                                       "  LoadAssembly (ass) - Loads the given assembly (like -r:ASS)\n" + 
-                                       "  ShowVars ();       - Shows defined local variables.\n" +
-                                       "  ShowUsing ();      - Show active using decltions.\n" +
-                                       "  Prompt             - The prompt used by the C# shell\n" +
-                                       "  ContinuationPrompt - The prompt for partial input\n" +
-                                       "  Time(() -> { })    - Times the specified code\n" +
-                                       "  quit;\n" +
-                                       "  help;\n";
+                               return "Static methods:\n" +
+                                       "  Describe (object)       - Describes the object's type\n" +
+                                       "  LoadPackage (package);  - Loads the given Package (like -pkg:FILE)\n" +
+                                       "  LoadAssembly (assembly) - Loads the given assembly (like -r:ASSEMBLY)\n" +
+                                       "  ShowVars ();            - Shows defined local variables.\n" +
+                                       "  ShowUsing ();           - Show active using declarations.\n" +
+                                       "  Prompt                  - The prompt used by the C# shell\n" +
+                                       "  ContinuationPrompt      - The prompt for partial input\n" +
+                                       "  Time(() -> { })         - Times the specified code\n" +
+                                       "  quit;                   - You'll never believe it - this quits the repl!\n" +
+                                       "  help;                   - This help text\n";
                        }
                }
 
@@ -1070,14 +1088,12 @@ namespace Mono.CSharp {
                static public string Describe (object x)
                {
                        if (x == null)
-                               return "";
-                       
-                       Type t = x as Type;
-                       if (t == null)
-                               t = x.GetType ();
+                               return "<null>";
+
+                       var type = x as Type ?? x.GetType ();
 
                        StringWriter sw = new StringWriter ();
-                       new Outline (t, sw, true, false, false).OutlineType ();
+                       new Outline (type, sw, true, false, false).OutlineType ();
                        return sw.ToString ();
                }
 #endif
@@ -1148,15 +1164,39 @@ namespace Mono.CSharp {
                {
                }
 
-               public override Expression DoResolve (ResolveContext ec)
+               protected override Expression DoResolve (ResolveContext ec)
                {
                        CloneContext cc = new CloneContext ();
                        Expression clone = source.Clone (cc);
 
-                       clone = clone.Resolve (ec);
-                       if (clone == null)
-                               return null;
-
+                       //
+                       // A useful feature for the REPL: if we can resolve the expression
+                       // as a type, Describe the type;
+                       //
+                       if (Evaluator.DescribeTypeExpressions){
+                               var old_printer = Evaluator.SetPrinter (new StreamReportPrinter (TextWriter.Null));
+                               clone = clone.Resolve (ec);
+                               if (clone == null){
+                                       clone = source.Clone (cc);
+                                       clone = clone.Resolve (ec, ResolveFlags.Type);
+                                       if (clone == null){
+                                               Evaluator.SetPrinter (old_printer);
+                                               clone = source.Clone (cc);
+                                               clone = clone.Resolve (ec);
+                                               return null;
+                                       }
+                                       
+                                       Arguments args = new Arguments (1);
+                                       args.Add (new Argument (new TypeOf ((TypeExpr) clone, Location)));
+                                       source = new Invocation (new SimpleName ("Describe", Location), args).Resolve (ec);
+                               }
+                               Evaluator.SetPrinter (old_printer);
+                       } else {
+                               clone = clone.Resolve (ec);
+                               if (clone == null)
+                                       return null;
+                       }
+       
                        // This means its really a statement.
                        if (clone.Type == TypeManager.void_type){
                                source = source.Resolve (ec);
@@ -1187,11 +1227,11 @@ namespace Mono.CSharp {
        }
 
        public class Undo {
-               ArrayList undo_types;
+               List<KeyValuePair<TypeContainer, TypeContainer>> undo_types;
                
                public Undo ()
                {
-                       undo_types = new ArrayList ();
+                       undo_types = new List<KeyValuePair<TypeContainer, TypeContainer>> ();
                }
 
                public void AddTypeContainer (TypeContainer current_container, TypeContainer tc)
@@ -1200,10 +1240,11 @@ namespace Mono.CSharp {
                                Console.Error.WriteLine ("Internal error: inserting container into itself");
                                return;
                        }
-                       
+
                        if (undo_types == null)
-                               undo_types = new ArrayList ();
-                       undo_types.Add (new Pair (current_container, tc));
+                               undo_types = new List<KeyValuePair<TypeContainer, TypeContainer>> ();
+
+                       undo_types.Add (new KeyValuePair<TypeContainer, TypeContainer> (current_container, tc));
                }
 
                public void ExecuteUndo ()
@@ -1211,10 +1252,10 @@ namespace Mono.CSharp {
                        if (undo_types == null)
                                return;
 
-                       foreach (Pair p in undo_types){
-                               TypeContainer current_container = (TypeContainer) p.First;
+                       foreach (var p in undo_types){
+                               TypeContainer current_container = p.Key;
 
-                               current_container.RemoveTypeContainer ((TypeContainer) p.Second);
+                               current_container.RemoveTypeContainer (p.Value);
                        }
                        undo_types = null;
                }