2 // eval.cs: Evaluation and Hosting API for the C# compiler
5 // Miguel de Icaza (miguel@gnome.org)
7 // Dual licensed under the terms of the MIT X11 or GNU GPL
9 // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
10 // Copyright 2004, 2005, 2006, 2007, 2008 Novell, Inc
13 using System
.Threading
;
14 using System
.Collections
;
15 using System
.Reflection
;
16 using System
.Reflection
.Emit
;
18 using System
.Globalization
;
21 namespace Mono
.CSharp
{
24 /// Evaluator: provides an API to evaluate C# statements and
25 /// expressions dynamically.
28 /// This class exposes static methods to evaluate expressions in the
31 /// To initialize the evaluator with a number of compiler
32 /// options call the Init(string[]args) method with a set of
33 /// command line options that the compiler recognizes.
35 /// To interrupt execution of a statement, you can invoke the
36 /// Evaluator.Interrupt method.
38 public class Evaluator
{
41 // Parse silently, do not output any error messages
44 // Report errors during parse
47 // Auto-complete, means that the tokenizer will start producing
48 // GETCOMPLETIONS tokens when it reaches a certain point.
52 static object evaluator_lock
= new object ();
54 static string current_debug_name
;
56 static Thread invoke_thread
;
58 static ArrayList using_alias_list
= new ArrayList ();
59 internal static ArrayList using_list
= new ArrayList ();
60 static Hashtable fields
= new Hashtable ();
62 static Type interactive_base_class
= typeof (InteractiveBase
);
67 /// Optional initialization for the Evaluator.
70 /// Initializes the Evaluator with the command line options
71 /// that would be processed by the command line compiler. Only
72 /// the first call to Init will work, any future invocations are
75 /// You can safely avoid calling this method if your application
76 /// does not need any of the features exposed by the command line
79 public static void Init (string [] args
)
81 InitAndGetStartupFiles (args
);
86 /// Optional initialization for the Evaluator.
89 /// Initializes the Evaluator with the command line
90 /// options that would be processed by the command
91 /// line compiler. Only the first call to
92 /// InitAndGetStartupFiles or Init will work, any future
93 /// invocations are ignored.
95 /// You can safely avoid calling this method if your application
96 /// does not need any of the features exposed by the command line
99 /// This method return an array of strings that contains any
100 /// files that were specified in `args'.
102 public static string [] InitAndGetStartupFiles (string [] args
)
104 lock (evaluator_lock
){
106 return new string [0];
108 driver
= Driver
.Create (args
, false);
110 throw new Exception ("Failed to create compiler driver with the given arguments");
112 driver
.ProcessDefaultConfig ();
114 ArrayList startup_files
= new ArrayList ();
115 foreach (CompilationUnit file
in Location
.SourceFiles
)
116 startup_files
.Add (file
.Path
);
118 CompilerCallableEntryPoint
.Reset ();
119 driver
.LoadReferences ();
120 RootContext
.EvalMode
= true;
123 return (string []) startup_files
.ToArray (typeof (string));
129 Init (new string [0]);
134 CompilerCallableEntryPoint
.PartialReset ();
137 // PartialReset should not reset the core types, this is very redundant.
139 if (!TypeManager
.InitCoreTypes ())
140 throw new Exception ("Failed to InitCoreTypes");
141 TypeManager
.InitOptionalCoreTypes ();
143 Location
.AddFile ("{interactive}");
144 Location
.Initialize ();
146 current_debug_name
= "interactive" + (count
++) + ".dll";
147 if (Environment
.GetEnvironmentVariable ("SAVE") != null){
148 CodeGen
.Init (current_debug_name
, current_debug_name
, false);
150 CodeGen
.InitDynamic (current_debug_name
);
154 /// The base class for the classes that host the user generated code
158 /// This is the base class that will host the code
159 /// executed by the Evaluator. By default
160 /// this is the Mono.CSharp.InteractiveBase class
161 /// which is useful for interactive use.
163 /// By changing this property you can control the
164 /// base class and the static members that are
165 /// available to your evaluated code.
167 static public Type InteractiveBaseClass
{
169 return interactive_base_class
;
174 throw new ArgumentNullException ();
176 lock (evaluator_lock
)
177 interactive_base_class
= value;
182 /// Interrupts the evaluation of an expression executing in Evaluate.
185 /// Use this method to interrupt long-running invocations.
187 public static void Interrupt ()
189 if (!inited
|| !invoking
)
192 if (invoke_thread
!= null)
193 invoke_thread
.Abort ();
197 /// Compiles the input string and returns a delegate that represents the compiled code.
201 /// Compiles the input string as a C# expression or
202 /// statement, unlike the Evaluate method, the
203 /// resulting delegate can be invoked multiple times
204 /// without incurring in the compilation overhead.
206 /// If the return value of this function is null,
207 /// this indicates that the parsing was complete.
208 /// If the return value is a string it indicates
209 /// that the input string was partial and that the
210 /// invoking code should provide more code before
211 /// the code can be successfully compiled.
213 /// If you know that you will always get full expressions or
214 /// statements and do not care about partial input, you can use
215 /// the other Compile overload.
217 /// On success, in addition to returning null, the
218 /// compiled parameter will be set to the delegate
219 /// that can be invoked to execute the code.
222 static public string Compile (string input
, out CompiledMethod compiled
)
224 if (input
== null || input
.Length
== 0){
229 lock (evaluator_lock
){
234 CSharpParser parser
= ParseString (ParseMode
.Silent
, input
, out partial_input
);
240 ParseString (ParseMode
.ReportErrors
, input
, out partial_input
);
244 object parser_result
= parser
.InteractiveResult
;
246 if (!(parser_result
is Class
)){
247 int errors
= Report
.Errors
;
249 NamespaceEntry
.VerifyAllUsing ();
250 if (errors
== Report
.Errors
)
251 parser
.CurrentNamespace
.Extract (using_alias_list
, using_list
);
254 compiled
= CompileBlock (parser_result
as Class
, parser
.undo
);
261 /// Compiles the input string and returns a delegate that represents the compiled code.
265 /// Compiles the input string as a C# expression or
266 /// statement, unlike the Evaluate method, the
267 /// resulting delegate can be invoked multiple times
268 /// without incurring in the compilation overhead.
270 /// This method can only deal with fully formed input
271 /// strings and does not provide a completion mechanism.
272 /// If you must deal with partial input (for example for
273 /// interactive use) use the other overload.
275 /// On success, a delegate is returned that can be used
276 /// to invoke the method.
279 static public CompiledMethod
Compile (string input
)
281 CompiledMethod compiled
;
283 // Ignore partial inputs
284 if (Compile (input
, out compiled
) != null){
285 // Error, the input was partial.
289 // Either null (on error) or the compiled method.
294 // Todo: Should we handle errors, or expect the calling code to setup
295 // the recording themselves?
299 /// Evaluates and expression or statement and returns any result values.
302 /// Evaluates the input string as a C# expression or
303 /// statement. If the input string is an expression
304 /// the result will be stored in the result variable
305 /// and the result_set variable will be set to true.
307 /// It is necessary to use the result/result_set
308 /// pair to identify when a result was set (for
309 /// example, execution of user-provided input can be
310 /// an expression, a statement or others, and
311 /// result_set would only be set if the input was an
314 /// If the return value of this function is null,
315 /// this indicates that the parsing was complete.
316 /// If the return value is a string, it indicates
317 /// that the input is partial and that the user
318 /// should provide an updated string.
320 public static string Evaluate (string input
, out object result
, out bool result_set
)
322 CompiledMethod compiled
;
327 input
= Compile (input
, out compiled
);
331 if (compiled
== null)
335 // The code execution does not need to keep the compiler lock
337 object retval
= typeof (NoValueSet
);
340 invoke_thread
= System
.Threading
.Thread
.CurrentThread
;
342 compiled (ref retval
);
343 } catch (ThreadAbortException e
){
344 Thread
.ResetAbort ();
345 Console
.WriteLine ("Interrupted!\n{0}", e
);
351 // We use a reference to a compiler type, in this case
352 // Driver as a flag to indicate that this was a statement
354 if (retval
!= typeof (NoValueSet
)){
362 public static string [] GetCompletions (string input
, out string prefix
)
365 if (input
== null || input
.Length
== 0)
368 lock (evaluator_lock
){
373 CSharpParser parser
= ParseString (ParseMode
.GetCompletions
, input
, out partial_input
);
375 if (CSharpParser
.yacc_verbose_flag
!= 0)
376 Console
.WriteLine ("DEBUG: No completions available");
380 Class parser_result
= parser
.InteractiveResult
as Class
;
382 if (parser_result
== null){
383 if (CSharpParser
.yacc_verbose_flag
!= 0)
384 Console
.WriteLine ("Do not know how to cope with !Class yet");
389 RootContext
.ResolveTree ();
390 if (Report
.Errors
!= 0)
393 RootContext
.PopulateTypes ();
394 if (Report
.Errors
!= 0)
397 MethodOrOperator method
= null;
398 foreach (MemberCore member
in parser_result
.Methods
){
399 if (member
.Name
!= "Host")
402 method
= (MethodOrOperator
) member
;
406 throw new InternalErrorException ("did not find the the Host method");
408 EmitContext ec
= method
.CreateEmitContext (method
.Parent
, null);
412 ec
.ResolveTopBlock (null, method
.Block
, method
.ParameterInfo
, method
, out unreach
);
413 } catch (CompletionResult cr
){
414 prefix
= cr
.BaseText
;
418 parser
.undo
.ExecuteUndo ();
426 /// Executes the given expression or statement.
429 /// Executes the provided statement, returns true
430 /// on success, false on parsing errors. Exceptions
431 /// might be thrown by the called code.
433 public static bool Run (string statement
)
441 bool ok
= Evaluate (statement
, out result
, out result_set
) == null;
447 /// Evaluates and expression or statement and returns the result.
450 /// Evaluates the input string as a C# expression or
451 /// statement and returns the value.
453 /// This method will throw an exception if there is a syntax error,
454 /// of if the provided input is not an expression but a statement.
456 public static object Evaluate (string input
)
461 string r
= Evaluate (input
, out result
, out result_set
);
464 throw new ArgumentException ("Syntax error on input: partial input");
466 if (result_set
== false)
467 throw new ArgumentException ("The expression did not set a result");
474 StatementOrExpression
,
480 // Deambiguates the input string to determine if we
481 // want to process a statement or if we want to
482 // process a compilation unit.
484 // This is done using a top-down predictive parser,
485 // since the yacc/jay parser can not deambiguage this
486 // without more than one lookahead token. There are very
489 static InputKind
ToplevelOrStatement (SeekableStreamReader seekable
)
491 Tokenizer tokenizer
= new Tokenizer (seekable
, (CompilationUnit
) Location
.SourceFiles
[0]);
493 int t
= tokenizer
.token ();
496 return InputKind
.EOF
;
498 // These are toplevels
500 case Token
.OPEN_BRACKET
:
504 case Token
.INTERFACE
:
506 case Token
.NAMESPACE
:
508 case Token
.PROTECTED
:
513 return InputKind
.CompilationUnit
;
515 // Definitely expression
532 return InputKind
.StatementOrExpression
;
534 // These need deambiguation help
536 t
= tokenizer
.token ();
538 return InputKind
.EOF
;
540 if (t
== Token
.IDENTIFIER
)
541 return InputKind
.CompilationUnit
;
542 return InputKind
.StatementOrExpression
;
545 // Distinguish between:
546 // delegate opt_anonymous_method_signature block
549 t
= tokenizer
.token ();
551 return InputKind
.EOF
;
552 if (t
== Token
.OPEN_PARENS
|| t
== Token
.OPEN_BRACE
)
553 return InputKind
.StatementOrExpression
;
554 return InputKind
.CompilationUnit
;
556 // Distinguih between:
558 // unsafe as modifier of a type declaration
560 t
= tokenizer
.token ();
562 return InputKind
.EOF
;
563 if (t
== Token
.OPEN_PARENS
)
564 return InputKind
.StatementOrExpression
;
565 return InputKind
.CompilationUnit
;
567 // These are errors: we list explicitly what we had
568 // from the grammar, ERROR and then everything else
573 return InputKind
.Error
;
575 // This catches everything else allowed by
576 // expressions. We could add one-by-one use cases
579 return InputKind
.StatementOrExpression
;
584 // Parses the string @input and returns a CSharpParser if succeeful.
586 // if @silent is set to true then no errors are
587 // reported to the user. This is used to do various calls to the
588 // parser and check if the expression is parsable.
590 // @partial_input: if @silent is true, then it returns whether the
591 // parsed expression was partial, and more data is needed
593 static CSharpParser
ParseString (ParseMode mode
, string input
, out bool partial_input
)
595 partial_input
= false;
597 queued_fields
.Clear ();
599 Stream s
= new MemoryStream (Encoding
.Default
.GetBytes (input
));
600 SeekableStreamReader seekable
= new SeekableStreamReader (s
, Encoding
.Default
);
602 InputKind kind
= ToplevelOrStatement (seekable
);
603 if (kind
== InputKind
.Error
){
604 if (mode
== ParseMode
.ReportErrors
)
605 Report
.Error (-25, "Detection Parsing Error");
606 partial_input
= false;
610 if (kind
== InputKind
.EOF
){
611 if (mode
== ParseMode
.ReportErrors
)
612 Console
.Error
.WriteLine ("Internal error: EOF condition should have been detected in a previous call with silent=true");
613 partial_input
= true;
617 seekable
.Position
= 0;
619 CSharpParser parser
= new CSharpParser (seekable
, (CompilationUnit
) Location
.SourceFiles
[0]);
620 parser
.ErrorOutput
= Report
.Stderr
;
622 if (kind
== InputKind
.StatementOrExpression
){
623 parser
.Lexer
.putback_char
= Tokenizer
.EvalStatementParserCharacter
;
624 RootContext
.StatementMode
= true;
627 // Do not activate EvalCompilationUnitParserCharacter until
628 // I have figured out all the limitations to invoke methods
629 // in the generated classes. See repl.txt
631 parser
.Lexer
.putback_char
= Tokenizer
.EvalUsingDeclarationsParserCharacter
;
632 //parser.Lexer.putback_char = Tokenizer.EvalCompilationUnitParserCharacter;
633 RootContext
.StatementMode
= false;
636 if (mode
== ParseMode
.GetCompletions
)
637 parser
.Lexer
.CompleteOnEOF
= true;
639 bool disable_error_reporting
;
640 if ((mode
== ParseMode
.Silent
|| mode
== ParseMode
.GetCompletions
) && CSharpParser
.yacc_verbose_flag
== 0)
641 disable_error_reporting
= true;
643 disable_error_reporting
= false;
645 if (disable_error_reporting
)
646 Report
.DisableReporting ();
650 if (Report
.Errors
!= 0){
651 if (mode
!= ParseMode
.ReportErrors
&& parser
.UnexpectedEOF
)
652 partial_input
= true;
654 parser
.undo
.ExecuteUndo ();
658 if (disable_error_reporting
)
659 Report
.EnableReporting ();
665 // Queue all the fields that we use, as we need to then go from FieldBuilder to FieldInfo
666 // or reflection gets confused (it basically gets confused, and variables override each
669 static ArrayList queued_fields
= new ArrayList ();
671 //static ArrayList types = new ArrayList ();
673 static volatile bool invoking
;
675 static CompiledMethod
CompileBlock (Class host
, Undo undo
)
677 RootContext
.ResolveTree ();
678 if (Report
.Errors
!= 0){
683 RootContext
.PopulateTypes ();
685 if (Report
.Errors
!= 0){
690 TypeBuilder tb
= null;
691 MethodBuilder mb
= null;
694 tb
= host
.TypeBuilder
;
696 foreach (MemberCore member
in host
.Methods
){
697 if (member
.Name
!= "Host")
700 MethodOrOperator method
= (MethodOrOperator
) member
;
701 mb
= method
.MethodBuilder
;
706 throw new Exception ("Internal error: did not find the method builder for the generated method");
709 RootContext
.EmitCode ();
710 if (Report
.Errors
!= 0)
713 RootContext
.CloseTypes ();
715 if (Environment
.GetEnvironmentVariable ("SAVE") != null)
716 CodeGen
.Save (current_debug_name
, false);
722 // Unlike Mono, .NET requires that the MethodInfo is fetched, it cant
723 // work from MethodBuilders. Retarded, I know.
725 Type tt
= CodeGen
.Assembly
.Builder
.GetType (tb
.Name
);
726 MethodInfo mi
= tt
.GetMethod (mb
.Name
);
728 // Pull the FieldInfos from the type, and keep track of them
729 foreach (Field field
in queued_fields
){
730 FieldInfo fi
= tt
.GetField (field
.Name
);
732 FieldInfo old
= (FieldInfo
) fields
[field
.Name
];
734 // If a previous value was set, nullify it, so that we do
737 if (TypeManager
.IsStruct (old
.FieldType
)){
739 // TODO: Clear fields for structs
743 old
.SetValue (null, null);
749 fields
[field
.Name
] = fi
;
753 queued_fields
.Clear ();
755 return (CompiledMethod
) System
.Delegate
.CreateDelegate (typeof (CompiledMethod
), mi
);
758 static internal void LoadAliases (NamespaceEntry ns
)
760 ns
.Populate (using_alias_list
, using_list
);
764 /// A sentinel value used to indicate that no value was
765 /// was set by the compiled function. This is used to
766 /// differentiate between a function not returning a
769 public class NoValueSet
{
772 static internal FieldInfo
LookupField (string name
)
774 FieldInfo fi
= (FieldInfo
) fields
[name
];
780 // Puts the FieldBuilder into a queue of names that will be
781 // registered. We can not register FieldBuilders directly
782 // we need to fetch the FieldInfo after Reflection cooks the
783 // types, or bad things happen (bad means: FieldBuilders behave
784 // incorrectly across multiple assemblies, causing assignments to
787 // This also serves for the parser to register Field classes
788 // that should be exposed as global variables
790 static internal void QueueField (Field f
)
792 queued_fields
.Add (f
);
795 static string Quote (string s
)
797 if (s
.IndexOf ('"') != -1)
798 s
= s
.Replace ("\"", "\\\"");
800 return "\"" + s
+ "\"";
803 static public string GetUsing ()
805 lock (evaluator_lock
){
806 StringBuilder sb
= new StringBuilder ();
808 foreach (object x
in using_alias_list
)
809 sb
.Append (String
.Format ("using {0};\n", x
));
811 foreach (object x
in using_list
)
812 sb
.Append (String
.Format ("using {0};\n", x
));
814 return sb
.ToString ();
818 static internal ICollection
GetUsingList ()
820 ArrayList res
= new ArrayList (using_list
.Count
);
821 foreach (object ue
in using_list
)
822 res
.Add (ue
.ToString ());
826 static internal string [] GetVarNames ()
828 lock (evaluator_lock
){
829 return (string []) new ArrayList (fields
.Keys
).ToArray (typeof (string));
833 static public string GetVars ()
835 lock (evaluator_lock
){
836 StringBuilder sb
= new StringBuilder ();
838 foreach (DictionaryEntry de
in fields
){
839 FieldInfo fi
= LookupField ((string) de
.Key
);
846 value = fi
.GetValue (null);
848 value = Quote ((string)value);
854 sb
.Append (String
.Format ("{0} {1} <error reading value>", TypeManager
.CSharpName(fi
.FieldType
), de
.Key
));
856 sb
.Append (String
.Format ("{0} {1} = {2}", TypeManager
.CSharpName(fi
.FieldType
), de
.Key
, value));
859 return sb
.ToString ();
864 /// Loads the given assembly and exposes the API to the user.
866 static public void LoadAssembly (string file
)
868 lock (evaluator_lock
){
869 Driver
.LoadAssembly (file
, false);
870 GlobalRootNamespace
.Instance
.ComputeNamespaces ();
875 /// Exposes the API of the given assembly to the Evaluator
877 static public void ReferenceAssembly (Assembly a
)
879 lock (evaluator_lock
){
880 GlobalRootNamespace
.Instance
.AddAssemblyReference (a
);
881 GlobalRootNamespace
.Instance
.ComputeNamespaces ();
889 /// A delegate that can be used to invoke the
890 /// compiled expression or statement.
893 /// Since the Compile methods will compile
894 /// statements and expressions into the same
895 /// delegate, you can tell if a value was returned
896 /// by checking whether the returned value is of type
900 public delegate void CompiledMethod (ref object retvalue
);
903 /// The default base class for every interaction line
906 /// The expressions and statements behave as if they were
907 /// a static method of this class. The InteractiveBase class
908 /// contains a number of useful methods, but can be overwritten
909 /// by setting the InteractiveBaseType property in the Evaluator
911 public class InteractiveBase
{
913 /// Determines where the standard output of methods in this class will go.
915 public static TextWriter Output
= Console
.Out
;
918 /// Determines where the standard error of methods in this class will go.
920 public static TextWriter Error
= Console
.Error
;
923 /// The primary prompt used for interactive use.
925 public static string Prompt
= "csharp> ";
928 /// The secondary prompt used for interactive use (used when
929 /// an expression is incomplete).
931 public static string ContinuationPrompt
= " > ";
934 /// Used to signal that the user has invoked the `quit' statement.
936 public static bool QuitRequested
;
939 /// Shows all the variables defined so far.
941 static public void ShowVars ()
943 Output
.Write (Evaluator
.GetVars ());
948 /// Displays the using statements in effect at this point.
950 static public void ShowUsing ()
952 Output
.Write (Evaluator
.GetUsing ());
956 public delegate void Simple ();
959 /// Times the execution of the given delegate
961 static public TimeSpan
Time (Simple a
)
963 DateTime start
= DateTime
.Now
;
965 return DateTime
.Now
- start
;
970 /// Loads the assemblies from a package
973 /// Loads the assemblies from a package. This is equivalent
974 /// to passing the -pkg: command line flag to the C# compiler
975 /// on the command line.
977 static public void LoadPackage (string pkg
)
980 Error
.WriteLine ("Invalid package specified");
984 string pkgout
= Driver
.GetPackageFlags (pkg
, false);
988 string [] xargs
= pkgout
.Trim (new Char
[] {' ', '\n', '\r', '\t'}
).
989 Split (new Char
[] { ' ', '\t'}
);
991 foreach (string s
in xargs
){
992 if (s
.StartsWith ("-r:") || s
.StartsWith ("/r:") || s
.StartsWith ("/reference:")){
993 string lib
= s
.Substring (s
.IndexOf (':')+1);
995 Evaluator
.LoadAssembly (lib
);
1003 /// Loads the assembly
1006 /// Loads the specified assembly and makes its types
1007 /// available to the evaluator. This is equivalent
1008 /// to passing the -pkg: command line flag to the C#
1009 /// compiler on the command line.
1011 static public void LoadAssembly (string assembly
)
1013 Evaluator
.LoadAssembly (assembly
);
1017 /// Returns a list of available static methods.
1019 static public string help
{
1021 return "Static methods:\n"+
1022 " Describe(obj) - Describes the object's type\n" +
1023 " LoadPackage (pkg); - Loads the given Package (like -pkg:FILE)\n" +
1024 " LoadAssembly (ass) - Loads the given assembly (like -r:ASS)\n" +
1025 " ShowVars (); - Shows defined local variables.\n" +
1026 " ShowUsing (); - Show active using decltions.\n" +
1027 " Prompt - The prompt used by the C# shell\n" +
1028 " ContinuationPrompt - The prompt for partial input\n" +
1029 " Time(() -> { }) - Times the specified code\n" +
1036 /// Indicates to the read-eval-print-loop that the interaction should be finished.
1038 static public object quit
{
1040 QuitRequested
= true;
1047 /// Describes an object or a type.
1050 /// This method will show a textual representation
1051 /// of the object's type. If the object is a
1052 /// System.Type it renders the type directly,
1053 /// otherwise it renders the type returned by
1054 /// invoking GetType on the object.
1056 static public string Describe (object x
)
1065 StringWriter sw
= new StringWriter ();
1066 new Outline (t
, sw
, true, false, false).OutlineType ();
1067 return sw
.ToString ();
1073 // A local variable reference that will create a Field in a
1074 // Class with the resolved type. This is necessary so we can
1075 // support "var" as a field type in a class declaration.
1077 // We allow LocalVariableReferece to do the heavy lifting, and
1078 // then we insert the field with the resolved type
1080 public class LocalVariableReferenceWithClassSideEffect
: LocalVariableReference
{
1081 TypeContainer container
;
1084 public LocalVariableReferenceWithClassSideEffect (TypeContainer container
, string name
, Block current_block
, string local_variable_id
, Location loc
)
1085 : base (current_block
, local_variable_id
, loc
)
1087 this.container
= container
;
1091 public override bool Equals (object obj
)
1093 LocalVariableReferenceWithClassSideEffect lvr
= obj
as LocalVariableReferenceWithClassSideEffect
;
1097 if (lvr
.name
!= name
|| lvr
.container
!= container
)
1100 return base.Equals (obj
);
1103 public override int GetHashCode ()
1105 return name
.GetHashCode ();
1108 override public Expression
DoResolveLValue (EmitContext ec
, Expression right_side
)
1110 Expression ret
= base.DoResolveLValue (ec
, right_side
);
1114 Field f
= new Field (container
, new TypeExpression (ret
.Type
, Location
),
1115 Modifiers
.PUBLIC
| Modifiers
.STATIC
,
1116 new MemberName (name
, Location
), null);
1117 container
.AddField (f
);
1119 Evaluator
.QueueField (f
);
1126 /// A class used to assign values if the source expression is not void
1128 /// Used by the interactive shell to allow it to call this code to set
1129 /// the return value for an invocation.
1131 class OptionalAssign
: SimpleAssign
{
1132 public OptionalAssign (Expression t
, Expression s
, Location loc
)
1137 public override Expression
DoResolve (EmitContext ec
)
1139 CloneContext cc
= new CloneContext ();
1140 Expression clone
= source
.Clone (cc
);
1142 clone
= clone
.Resolve (ec
);
1146 // This means its really a statement.
1147 if (clone
.Type
== TypeManager
.void_type
){
1148 source
= source
.Resolve (ec
);
1150 type
= TypeManager
.void_type
;
1151 eclass
= ExprClass
.Value
;
1155 return base.DoResolve (ec
);
1158 public override void Emit (EmitContext ec
)
1166 public override void EmitStatement (EmitContext ec
)
1171 base.EmitStatement (ec
);
1176 ArrayList undo_types
;
1180 undo_types
= new ArrayList ();
1183 public void AddTypeContainer (TypeContainer current_container
, TypeContainer tc
)
1185 if (current_container
== tc
){
1186 Console
.Error
.WriteLine ("Internal error: inserting container into itself");
1190 if (undo_types
== null)
1191 undo_types
= new ArrayList ();
1192 undo_types
.Add (new Pair (current_container
, tc
));
1195 public void ExecuteUndo ()
1197 if (undo_types
== null)
1200 foreach (Pair p
in undo_types
){
1201 TypeContainer current_container
= (TypeContainer
) p
.First
;
1203 current_container
.RemoveTypeContainer ((TypeContainer
) p
.Second
);