Hi,
while writing a simple script parser and runtime engine, I coped with a
compiler exception. The exception was caused by the duplicate case int
the switch statement.
That is quite strange and related to that peace of specific code,
because I tried to reproduce the same with other code but with no effect
(the compiler correctly signals an error and doesn't crash).
So I attached the faulty peace of code (a snippet from my whole project).
Sadly , Monodevelop 0.18 doesn't report any error into the Error List !!
while in Build Output the exception output was shown: I had hard time
figuring out my code was faulty !
That's the Monodevelop Build Output:
Building Project: test (Debug)
Performing main compilation...
Exception caught by the compiler while compiling:
Block that caused the problem begin at:
/home/#########/test/Main.cs(34,29):
Block being compiled:
[/home/#########/test/Main.cs(54,33):,Internal(1,1):]
System.NullReferenceException: Object reference not set to an instance
of an object
Internal compiler error at /home/#########/test/Main.cs(34,29)::
exception caught while emitting MethodBuilder [MainClass::Parse]
Unhandled Exception: System.NullReferenceException: Object reference not
set to an instance of an object
at Mono.CSharp.EnumMember.get_Value () [0x00000]
at Mono.CSharp.Enum.GetDefinition (System.Object value) [0x00000]
at Mono.CSharp.TypeManager.CSharpEnumValue (System.Type t,
System.Object value) [0x00000]
at Mono.CSharp.SwitchLabel.Erorr_AlreadyOccurs (System.Type
switch_type, Mono.CSharp.SwitchLabel collision_with) [0x00000]
at Mono.CSharp.Switch.CheckSwitch (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Switch.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.While.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.Block.Resolve (Mono.CSharp.EmitContext ec) [0x00000]
at Mono.CSharp.EmitContext.ResolveTopBlock (Mono.CSharp.EmitContext
anonymous_method_host, Mono.CSharp.ToplevelBlock block,
Mono.CSharp.Parameters ip, IMethodData md, System.Boolean& unreachable)
[0x00000]
Build complete -- 0 errors, 0 warnings
---------------------- Done ----------------------
Build successful.
Mono version is:
[EMAIL PROTECTED]:~> mono --version
Mono JIT compiler version 1.2.6 (tarball)
Copyright (C) 2002-2007 Novell, Inc and Contributors. www.mono-project.com
TLS: __thread
GC: Included Boehm (with typed GC)
SIGSEGV: normal
Notifications: epoll
Architecture: x86
Disabled: none
System is :
[EMAIL PROTECTED]:~> uname -a
Linux openSUSE-Dev 2.6.22.17-0.1-default #1 SMP 2008/02/10 20:01:04 UTC
i686 athlon i386 GNU/Linux
Hope this could help.
Nicola
---
http://www.ndatech.it
// Main.cs created with MonoDevelop
// User: ndellamico at 7:29 PMÂ 2/20/2008
//
// To change standard headers go to Edit->Preferences->Coding->Standard Headers
//
using System;
namespace test
{
class MainClass
{
public static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
private enum COMMANDS{
GVAR,
LVAR,
EVT_ADD,
EVT_DEL,
SET,
ADD,
SUB,
MUL,
DIV,
JE,
JGE,
JG,
JLE,
JL,
GOTO,
GOSUB,
};
public bool Parse( System.IO.StreamReader stream){
int source_line_index= 0;
while( stream.Peek()>= 0) {
++source_line_index;
string line= stream.ReadLine( ).Trim().ToUpper();
// Check for empty line
if( line.Length== 0)
continue;
// Check for comments
if( line[0]== ';')
continue;
// Strip away comments
string[] cmd_line= line.Split( ';');
// Tokenize the command string
string[] tokens= cmd_line[0].Split( new char[]{' ','\t'});
// Other specific stuff here
// ... omitted for clarity
// Command found
COMMANDS cmd= (COMMANDS) System.Enum.Parse( typeof( COMMANDS), tokens[0]);
switch( cmd) {
case COMMANDS.ADD:
// Dummy stuff here
System.Console.WriteLine( "command is ADD");
break;
case COMMANDS.MUL:
// Dummy stuff here
System.Console.WriteLine( "command is MUL");
break;
// This should cause a compiler exception error !!
case COMMANDS.MUL:
System.Console.WriteLine( "command is MUL ");
break;
}
}
}
}
}
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