mcs/class/Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpBinder.cs

   1 //
   2 // CSharpBinder.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2009 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Dynamic;
  31 using System.Linq.Expressions;
  32 using Compiler = Mono.CSharp;
  33 using System.Reflection;
  34 using System.Collections.Generic;
  35
  36 namespace Microsoft.CSharp.RuntimeBinder
  37 {
  38         static class CSharpBinder
  39         {
  40                 static ConstructorInfo binder_exception_ctor;
  41                 static object compiler_initializer = new object ();
  42                 static object resolver = new object ();
  43
  44                 public static DynamicMetaObject Bind (DynamicMetaObject target, Compiler.Expression expr, BindingRestrictions restrictions, DynamicMetaObject errorSuggestion)
  45                 {
  46                         return Bind (target, expr, null, restrictions, errorSuggestion);
  47                 }
  48
  49                 public static DynamicMetaObject Bind (DynamicMetaObject target, Compiler.Expression expr, Type callingType, BindingRestrictions restrictions, DynamicMetaObject errorSuggestion)
  50                 {
  51                         var ctx = CreateDefaultCompilerContext ();
  52
  53                         InitializeCompiler (ctx);
  54
  55                         Expression res;
  56                         try {
  57                                 // TODO: ResolveOptions
  58                                 Compiler.ResolveContext rc = new Compiler.ResolveContext (new RuntimeBinderContext (ctx, callingType));
  59
  60                                 // Static typemanager and internal caches are not thread-safe
  61                                 lock (resolver) {
  62                                         expr = expr.Resolve (rc);
  63                                 }
  64
  65                                 if (expr == null)
  66                                         throw new RuntimeBinderInternalCompilerException ("Expression resolved to null");
  67
  68                                 res = expr.MakeExpression (new Compiler.BuilderContext ());
  69                         } catch (RuntimeBinderException e) {
  70                                 if (errorSuggestion != null)
  71                                         return errorSuggestion;
  72
  73                                 res = CreateBinderException (target, e.Message);
  74                         } catch (Exception) {
  75                                 if (errorSuggestion != null)
  76                                         return errorSuggestion;
  77
  78                                 throw;
  79                         }
  80
  81                         return new DynamicMetaObject (res, restrictions);
  82                 }
  83
  84                 public static Expression CreateBinderException (DynamicMetaObject target, string message)
  85                 {
  86                         if (binder_exception_ctor == null)
  87                                 binder_exception_ctor = typeof (RuntimeBinderException).GetConstructor (new[] { typeof (string) });
  88
  89                         //
  90                         // Uses target type to keep expressions composition working
  91                         //
  92                         return Expression.Throw (Expression.New (binder_exception_ctor, Expression.Constant (message)), target.LimitType);
  93                 }
  94
  95                 //
  96                 // Creates mcs expression from dynamic method object
  97                 //
  98                 public static Compiler.Expression CreateCompilerExpression (CSharpArgumentInfo info, DynamicMetaObject value)
  99                 {
 100                         if (value.Value == null)
 101                                 return new Compiler.NullLiteral (value.LimitType, Compiler.Location.Null);
 102
 103                         if (info != null && (info.Flags & CSharpArgumentInfoFlags.LiteralConstant) != 0) {
 104                                 InitializeCompiler (null);
 105                                 return Compiler.Constant.CreateConstant (value.RuntimeType ?? value.LimitType, value.Value, Compiler.Location.Null);
 106                         }
 107
 108                         return new Compiler.RuntimeValueExpression (value);
 109                 }
 110
 111                 public static Compiler.Arguments CreateCompilerArguments (IEnumerable<CSharpArgumentInfo> info, DynamicMetaObject[] args)
 112                 {
 113                         var res = new Compiler.Arguments (args.Length);
 114                         int pos = 0;
 115                         foreach (var item in info) {
 116                                 var expr = CreateCompilerExpression (item, args [pos]);
 117                                 if (item.IsNamed) {
 118                                         res.Add (new Compiler.NamedArgument (new Compiler.LocatedToken (Compiler.Location.Null, item.Name), expr));
 119                                 } else {
 120                                         res.Add (new Compiler.Argument (expr, item.ArgumentModifier));
 121                                 }
 122                         }
 123
 124                         return res;
 125                 }
 126
 127                 static Compiler.CompilerContext CreateDefaultCompilerContext ()
 128                 {
 129                         return new Compiler.CompilerContext (
 130                                 new Compiler.Report (ErrorPrinter.Instance) {
 131                                         WarningLevel = 0
 132                                 }
 133                         );
 134                 }
 135
 136                 public static BindingRestrictions CreateRestrictionsOnTarget (DynamicMetaObject arg)
 137                 {
 138                         return arg.HasValue && arg.Value == null ?
 139                                 BindingRestrictions.GetInstanceRestriction (arg.Expression, null) :
 140                                 BindingRestrictions.GetTypeRestriction (arg.Expression, arg.LimitType);
 141                 }
 142
 143                 public static BindingRestrictions CreateRestrictionsOnTarget (DynamicMetaObject[] args)
 144                 {
 145                         var res = CreateRestrictionsOnTarget (args[0]);
 146                         for (int i = 1; i < args.Length; ++i)
 147                                 res = res.Merge (CreateRestrictionsOnTarget (args[i]));
 148
 149                         return res;
 150                 }
 151
 152                 static void InitializeCompiler (Compiler.CompilerContext ctx)
 153                 {
 154                         if (Compiler.TypeManager.object_type != null)
 155                                 return;
 156
 157                         lock (compiler_initializer) {
 158                                 if (Compiler.TypeManager.object_type != null)
 159                                         return;
 160
 161                                 // TODO: This smells like pretty big issue
 162                                 // AppDomain.CurrentDomain.AssemblyLoad += (sender, e) => { throw new NotImplementedException (); };
 163
 164                                 // Add all currently loaded assemblies
 165                                 foreach (System.Reflection.Assembly a in AppDomain.CurrentDomain.GetAssemblies ())
 166                                         Compiler.GlobalRootNamespace.Instance.AddAssemblyReference (a);
 167
 168                                 if (ctx == null)
 169                                         ctx = CreateDefaultCompilerContext ();
 170
 171                                 // FIXME: this is wrong
 172                                 Compiler.RootContext.ToplevelTypes = new Compiler.ModuleContainer (ctx, true);
 173
 174                                 Compiler.TypeManager.InitCoreTypes (ctx);
 175                                 Compiler.TypeManager.InitOptionalCoreTypes (ctx);
 176                         }
 177                 }
 178
 179                 public static DynamicMetaObject Bind (DynamicMetaObject target, DynamicMetaObject errorSuggestion, DynamicMetaObject[] args)
 180                 {
 181                         return Bind (target, errorSuggestion);
 182                 }
 183
 184                 public static DynamicMetaObject Bind (DynamicMetaObject target, DynamicMetaObject errorSuggestion)
 185                 {
 186                         return errorSuggestion ??
 187                                    new DynamicMetaObject (
 188                                                    Expression.Constant (new object ()),
 189                                                    target.Restrictions.Merge (
 190                                                            BindingRestrictions.GetTypeRestriction (
 191                                                                    target.Expression, target.LimitType)));
 192                 }
 193         }
 194 }