Bug 5387 - Step into does not always work
Summary: Step into does not always work
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2012-05-29 05:09 UTC by Marek Safar
Modified: 2012-06-08 12:01 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Marek Safar 2012-05-29 05:09:16 UTC
using System;

class Program
	static int Main ()
		dynamic d = 1;
		int a = d;
		return 0;

Then set a breakpoint in file /git/mono/mcs/class/dlr/Runtime/Microsoft.Scripting.Core/Actions/UpdateDelegates.Generated.cs at line 255

It should be line "rule = @this.Target = @this.Binder.BindCore(@this, args);"

Start debugging and when hit the breakpoint do Step Into. Debugger stop in the middle of BindCore method.
Comment 1 Zoltan Varga 2012-06-03 05:51:03 UTC
I can somewhat repro this. For me, md doesn't stop anywhere, it just keeps running slowly.
Comment 2 Zoltan Varga 2012-06-03 07:55:53 UTC
So the problem here is that there is no sequence point between the get_Binder () call and the BindCore () call. mcs doesn't generate a nop, and we don't automatically add a sequence point because the IL stack is not empty.
Comment 3 Zoltan Varga 2012-06-03 08:08:17 UTC
md issues a step in, then notices that it stepped into a property accessor, so it issues a step out, which should stop in the caller, but the caller has no sequence point between the get_Binder and BindCore () calls.
Comment 4 Marek Safar 2012-06-08 12:01:54 UTC
Fixed in master