A couple of months back I hit JIT errors when using LINQ for objects. I was
never able to resolve them, but as the LINQ involved was pretty simple, I
just "unrolled" it into procedural code.
Now I'm getting more of them, and I'd really prefer to leave the LINQ alone
if possible. The exception I'm getting today is:
Attempting to JIT compile method
'System.Linq.Enumerable:<ToLookup`2>m__18<JIT20110908.ActualScore, int>
(JIT20110908.ActualScore)' while running with --aot-only.
Below is my ProblemLinq.cs file, which contains a class with an Execute()
method that causes this error. I realize there's a lot of interfaces and
classes here; this is a severely dumbed-down version of the actual code,
which is part of a cross-platform reporting library. The code in question is
running in Windows as part of a production product.
I've read the "Limitations" section on the xamarin website, and while I
can't say I understand it totally, I don't see that my code is doing any of
the verboten virtualization things; although LINQ does enough magic that I
don't necessarily know the secondary effects of the code.
The stack trace from the error this class causes follows the code.
I'm running MT 4.0.7 and MD2.6.
Am I doing some LINQ thing I shouldn't? Or is MT missing something?
Thanks.
// PROBLEMLINQ.CS -- calling the Execute method on ProblemLinq causes this
error
using System;
using System.Linq;
using System.Collections.Generic;
namespace JIT20110908
{
public class ProblemLinq
{
public ProblemLinq ()
{
}
public IList<SummaryRow> Execute ()
{
DateTime startDate = new DateTime (2011, 07, 01);
DateTime endDate = new DateTime (2011, 08, 01);
IList<IScore> scores = new List<IScore> ();
ActualScore score1 = new ActualScore () {
Name = "ACTIVITIES",
Score = 22.2,
OwnerID = 666
} ;
scores.Add (score1);
IList<IFooSession > sessions = new List<IFooSession> ();
MySession mysession = new MySession () {
SessionDate = new DateTime(2011, 07, 15),
SessionID = 666,
} ;
sessions.Add (mysession);
IList<SummaryRow > summaryRows = (from s in sessions
orderby s.SessionDate
join score
inscores.OfType<ActualScore>()
on s.SessionID equals
score.OwnerID
where s.SessionDate >=
startDate && s.SessionDate <= endDate
select new SummaryRow
{
AssessmentDate =
s.SessionDate,
Name = score.Name,
OwnerID = score.OwnerID
}).ToList ();
return summaryRows;
}
}
public interface IScore
{
int OwnerID { get; set; }
string Name { get; set; }
}
public class SummaryRow : IScore
{
public string Name { get; set; }
public int OwnerID { get; set; }
public DateTime AssessmentDate { get; set; }
}
public interface IFooSession
{
int SessionID { get; set; }
DateTime SessionDate { get; set; }
}
public class MySession : IFooSession
{
public int SessionID { get; set; }
public DateTime SessionDate { get; set; }
}
public class GeneralScore : IScore
{
public int OwnerID { get; set; }
public string Name { get; set; }
}
public class ActualScore : GeneralScore
{
public double Score { get; set; }
}
}
// END PROBLEMLINQ.CS
STACK TRACE FROM ERROR:
Unhandled Exception: System.ExecutionEngineException: Attempting to JIT
compile method
'System.Linq.Enumerable:<ToLookup`2>m__18<JIT20110908.ActualScore, int>
(JIT20110908.ActualScore)' while running with --aot-only.
at System.Linq.Enumerable.ToLookup[ActualScore,Int32,ActualScore]
(IEnumerable`1 source, System.Func`2 keySelector, System.Func`2
elementSelector, IEqualityComparer`1 comparer) [0x00079] in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2915
at System.Linq.Enumerable.ToLookup[ActualScore,Int32] (IEnumerable`1
source, System.Func`2 keySelector, IEqualityComparer`1 comparer) [0x00000]
in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2883
at
System.Linq.Enumerable+<CreateJoinIterator>c__IteratorB`4[JIT20110908.IFooSession,JIT20110908.ActualScore,System.Int32,<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore]].MoveNext
() [0x00023] in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:1153
at
System.Linq.Enumerable+<CreateWhereIterator>c__Iterator1E`1[<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore]].MoveNext
() [0x00000] in <filename unknown>:0
at
System.Linq.Enumerable+<CreateSelectIterator>c__Iterator10`2[<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore],JIT20110908.SummaryRow].MoveNext
() [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[JIT20110908.SummaryRow].AddEnumerable
(IEnumerable`1 enumerable) [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[JIT20110908.SummaryRow]..ctor
(IEnumerable`1 collection) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable.ToList[SummaryRow] (IEnumerable`1 source)
[0x00000] in <filename unknown>:0
at JIT20110908.ProblemLinq.Execute () [0x0009f] in
/Users/alphce/Projects/JIT20110908/JIT20110908/ProblemLinq.cs:33
at JIT20110908.AppDelegate.FinishedLaunching
(MonoTouch.UIKit.UIApplication app, MonoTouch.Foundation.NSDictionary
options) [0x00011] in
/Users/alphce/Projects/JIT20110908/JIT20110908/Main.cs:29
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x00000] in <filename
unknown>:0
at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in
<filename unknown>:0
at JIT20110908.Application.Main (System.String[] args) [0x00000] in
/Users/alphce/Projects/JIT20110908/JIT20110908/Main.cs:13
[ERROR] FATAL UNHANDLED EXCEPTION: System.ExecutionEngineException:
Attempting to JIT compile method
'System.Linq.Enumerable:<ToLookup`2>m__18<JIT20110908.ActualScore, int>
(JIT20110908.ActualScore)' while running with --aot-only.
at System.Linq.Enumerable.ToLookup[ActualScore,Int32,ActualScore]
(IEnumerable`1 source, System.Func`2 keySelector, System.Func`2
elementSelector, IEqualityComparer`1 comparer) [0x00079] in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2915
at System.Linq.Enumerable.ToLookup[ActualScore,Int32] (IEnumerable`1
source, System.Func`2 keySelector, IEqualityComparer`1 comparer) [0x00000]
in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2883
at
System.Linq.Enumerable+<CreateJoinIterator>c__IteratorB`4[JIT20110908.IFooSession,JIT20110908.ActualScore,System.Int32,<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore]].MoveNext
() [0x00023] in
/Developer/MonoTouch/Source/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:1153
at
System.Linq.Enumerable+<CreateWhereIterator>c__Iterator1E`1[<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore]].MoveNext
() [0x00000] in <filename unknown>:0
at
System.Linq.Enumerable+<CreateSelectIterator>c__Iterator10`2[<>__AnonType0`2[JIT20110908.IFooSession,JIT20110908.ActualScore],JIT20110908.SummaryRow].MoveNext
() [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[JIT20110908.SummaryRow].AddEnumerable
(IEnumerable`1 enumerable) [0x00000] in <filename unknown>:0
at System.Collections.Generic.List`1[JIT20110908.SummaryRow]..ctor
(IEnumerable`1 collection) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable.ToList[SummaryRow] (IEnumerable`1 source)
[0x00000] in <filename unknown>:0
at JIT20110908.ProblemLinq.Execute () [0x0009f] in
/Users/alphce/Projects/JIT20110908/JIT20110908/ProblemLinq.cs:33
at JIT20110908.AppDelegate.FinishedLaunching
(MonoTouch.UIKit.UIApplication app, MonoTouch.Foundation.NSDictionary
options) [0x00011] in
/Users/alphce/Projects/JIT20110908/JIT20110908/Main.cs:29
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x00000] in <filename
unknown>:0
at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in
<filename unknown>:0
at JIT20110908.Application.Main (System.String[] args) [0x00000] in
/Users/alphce/Projects/JIT20110908/JIT20110908/Main.cs:13
Terminating runtime due to unhandled exception
Stacktrace:
Native stacktrace:
0 JIT20110908 0x002653dc
mono_handle_native_sigsegv + 412
1 JIT20110908 0x0028c5c8 sigabrt_signal_handler +
148
2 libsystem_c.dylib 0x3564172f _sigtramp + 42
3 libsystem_c.dylib 0x356363bb pthread_kill + 58
4 libsystem_c.dylib 0x3562ebff abort + 78
5 JIT20110908 0x003a15bc monoeg_g_logv + 248
6 JIT20110908 0x003a1650 monoeg_assertion_message
+ 44
7 JIT20110908 0x00246e7c mono_thread_abort + 224
8 JIT20110908 0x00264824
mono_handle_exception_internal + 2436
9 JIT20110908 0x0026510c mono_handle_exception +
108
10 JIT20110908 0x0028a5dc mono_arm_throw_exception
+ 324
11 JIT20110908 0x0019547c throw_exception + 48
12 JIT20110908 0x00249e50 mono_jit_compile_method +
136
13 JIT20110908 0x003337ec mono_compile_method + 84
14 JIT20110908 0x00268110 mono_delegate_trampoline
+ 904
15 JIT20110908 0x00194f64
generic_trampoline_delegate + 136
16 JIT20110908 0x001f3254
System_Linq_Enumerable_ToLookup_JIT20110908_ActualScore_int_System_Collections_Generic_IEnumerable_1_JIT20110908_ActualScore_System_Func_2_JIT20110908_ActualScore_int_System_Collections_Generic_IEqualityComparer_1_int
+ 228
17 JIT20110908 0x001f0c58
System_Linq_Enumerable__CreateJoinIteratorc__IteratorB_4_JIT20110908_IFooSession_JIT20110908_ActualScore_int____AnonType0_2_JIT20110908_IFooSession_JIT20110908_ActualScore_MoveNext
+ 432
18 JIT20110908 0x00004ac0
System_Linq_Enumerable__CreateWhereIteratorc__Iterator1E_1_MoveNext + 456
19 JIT20110908 0x00004644
System_Linq_Enumerable__CreateSelectIteratorc__Iterator10_2_MoveNext + 432
20 JIT20110908 0x000ad5d8
System_Collections_Generic_List_1_AddEnumerable_System_Collections_Generic_IEnumerable_1_T
+ 188
21 JIT20110908 0x000acd68
System_Collections_Generic_List_1__ctor_System_Collections_Generic_IEnumerable_1_T
+ 132
22 JIT20110908 0x000030f8
System_Linq_Enumerable_ToList_TSource_System_Collections_Generic_IEnumerable_1_TSource
+ 68
23 JIT20110908 0x001e6be0
JIT20110908_ProblemLinq_Execute + 2604
24 JIT20110908 0x001e5e98
JIT20110908_AppDelegate_FinishedLaunching_MonoTouch_UIKit_UIApplication_MonoTouch_Foundation_NSDictionary
+ 300
25 JIT20110908 0x00164c88
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
+ 200
26 JIT20110908 0x0024af20 mono_jit_runtime_invoke +
2800
27 JIT20110908 0x00339bfc mono_runtime_invoke + 140
28 JIT20110908 0x003bf834 monotouch_trampoline +
2840
29 UIKit 0x31120821 -[UIApplication
_callInitializationDelegatesForURL:payload:suspended:] + 772
30 UIKit 0x3111ab65 -[UIApplication
_runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 272
31 UIKit 0x310ef7d7 -[UIApplication
handleEvent:withNewEvent:] + 1114
32 UIKit 0x310ef215 -[UIApplication
sendEvent:] + 44
33 UIKit 0x310eec53 _UIApplicationHandleEvent
+ 5090
34 GraphicsServices 0x31a7ae77 PurpleEventCallback + 666
35 CoreFoundation 0x3718ea97
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
36 CoreFoundation 0x3719083f __CFRunLoopDoSource1 +
166
37 CoreFoundation 0x3719160d __CFRunLoopRun + 520
38 CoreFoundation 0x37121ec3 CFRunLoopRunSpecific +
230
39 CoreFoundation 0x37121dcb CFRunLoopRunInMode + 58
40 UIKit 0x31119d49 -[UIApplication _run] +
372
41 UIKit 0x31117807 UIApplicationMain + 670
42 JIT20110908 0x0006656c
wrapper_managed_to_native_MonoTouch_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr
+ 240
43 JIT20110908 0x000528bc
MonoTouch_UIKit_UIApplication_Main_string__ + 36
44 JIT20110908 0x001e60a0
JIT20110908_Application_Main_string__ + 128
45 JIT20110908 0x00164c88
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
+ 200
46 JIT20110908 0x0024af20 mono_jit_runtime_invoke +
2800
47 JIT20110908 0x00339bfc mono_runtime_invoke + 140
48 JIT20110908 0x0033cbac mono_runtime_exec_main +
784
49 JIT20110908 0x0033bc10 mono_runtime_run_main +
1048
50 JIT20110908 0x002526d0 mono_jit_exec + 216
51 JIT20110908 0x002454f8 main + 3448
52 JIT20110908 0x00002774 start + 52
Debug info from gdb:
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
--
Brian Schuth
ALPHCE, Inc.
Eastport, ME
+1 207 370 2430
[email protected]
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