[Mono-bugs] [Bug 71783][Wis] New - Nested anonymous delegates causes gmcs exception

bugzilla-daemon@bugzilla.ximian.com bugzilla-daemon@bugzilla.ximian.com
Wed, 26 Jan 2005 12:08:03 -0500 (EST)


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Changed by ximian@asaj.org.

http://bugzilla.ximian.com/show_bug.cgi?id=71783

--- shadow/71783	2005-01-26 12:08:03.000000000 -0500
+++ shadow/71783.tmp.21852	2005-01-26 12:08:03.000000000 -0500
@@ -0,0 +1,92 @@
+Bug#: 71783
+Product: Mono: Compilers
+Version: 1.1
+OS: 
+OS Details: Gentoo 2.6.9-r4
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Wishlist
+Component: C#
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: ximian@asaj.org               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Nested anonymous delegates causes gmcs exception
+
+Description of Problem:
+
+Using nested anonymous delegates can cause (g)mcs to raise an exception
+"Type host is null".
+
+Steps to reproduce the problem:
+1. Compile the attached C# program using gmcs 1.1.2.0 or mcs 1.1.3.0.
+
+Actual Results:
+
+Unhandled Exception: System.Exception: Type host is null
+in <0x0009f> Mono.CSharp.AnonymousMethod:CreateMethodHost
+(Mono.CSharp.EmitContext,System.Type)
+in <0x0003d> Mono.CSharp.AnonymousMethod:EmitMethod (Mono.CSharp.EmitContext)
+in <0x0001a> Mono.CSharp.AnonymousDelegate:Emit (Mono.CSharp.EmitContext)
+in <0x00063> Mono.CSharp.LocalVariableReference:EmitAssign
+(Mono.CSharp.EmitContext,Mono.CSharp.Expression,bool,bool)
+in <0x001b0> Mono.CSharp.Assign:Emit (Mono.CSharp.EmitContext,bool)
+in <0x00012> Mono.CSharp.Assign:EmitStatement (Mono.CSharp.EmitContext)
+in <0x00011> Mono.CSharp.StatementExpression:DoEmit (Mono.CSharp.EmitContext)
+in <0x00024> Mono.CSharp.Statement:Emit (Mono.CSharp.EmitContext)
+in <0x00079> Mono.CSharp.Block:DoEmit (Mono.CSharp.EmitContext)
+in <0x00298> Mono.CSharp.Block:Emit (Mono.CSharp.EmitContext)
+in <0x0001a> Mono.CSharp.EmitContext:EmitResolvedTopBlock
+(Mono.CSharp.ToplevelBlock,bool)
+in <0x000d2> Mono.CSharp.AnonymousMethod:EmitMethod (Mono.CSharp.EmitContext)
+in <0x0001a> Mono.CSharp.AnonymousDelegate:Emit (Mono.CSharp.EmitContext)
+in <0x00063> Mono.CSharp.LocalVariableReference:EmitAssign
+(Mono.CSharp.EmitContext,Mono.CSharp.Expression,bool,bool)
+in <0x001b0> Mono.CSharp.Assign:Emit (Mono.CSharp.EmitContext,bool)
+in <0x00012> Mono.CSharp.Assign:EmitStatement (Mono.CSharp.EmitContext)
+in <0x00011> Mono.CSharp.StatementExpression:DoEmit (Mono.CSharp.EmitContext)
+in <0x00024> Mono.CSharp.Statement:Emit (Mono.CSharp.EmitContext)
+in <0x00079> Mono.CSharp.Block:DoEmit (Mono.CSharp.EmitContext)
+in <0x00298> Mono.CSharp.Block:Emit (Mono.CSharp.EmitContext)
+in <0x0001a> Mono.CSharp.EmitContext:EmitResolvedTopBlock
+(Mono.CSharp.ToplevelBlock,bool)
+in <0x00062> Mono.CSharp.EmitContext:EmitTopBlock
+(Mono.CSharp.ToplevelBlock,Mono.CSharp.InternalParameters,Mono.CSharp.Location)
+in <0x00469> Mono.CSharp.MethodData:Emit
+(Mono.CSharp.TypeContainer,Mono.CSharp.Attributable)
+in <0x00027> Mono.CSharp.Method:Emit ()
+in <0x005e2> Mono.CSharp.TypeContainer:EmitType ()
+in <0x0045c> Mono.CSharp.RootContext:EmitCode ()
+in <0x00d1e> Mono.CSharp.Driver:MainDriver (string[])
+in <0x0001f> Mono.CSharp.Driver:Main (string[])
+
+Expected Results:
+
+Successful compilation.
+
+How often does this happen? 
+
+Always.
+
+Additional Information:
+
+The source which causes the problem:
+
+delegate int Foo(int x);
+
+class Test {
+
+  void Weird() {
+    Foo b=delegate(int x) {
+      // Note that commenting out either c or d
+      // causes the problem to go away!
+      Foo c=delegate(int y) { return 0; };
+      Foo d=delegate(int z) { return 0; };
+      return x;
+    };
+  }
+
+}