Bug 3087 - Optimization "precomp" breaks with EMA-335
Summary: Optimization "precomp" breaks with EMA-335
Alias: None
Product: Runtime
Classification: Mono
Component: JIT ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2012-01-26 06:20 UTC by Martin Daeumler
Modified: 2012-09-02 13:37 UTC (History)
4 users (show)

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

Test case with a class constructor which is executed too early while pre-compiling (733 bytes, application/octet-stream)
2012-01-26 06:20 UTC, Martin Daeumler

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Description Martin Daeumler 2012-01-26 06:20:32 UTC
Created attachment 1273 [details]
Test case with a class constructor which is executed too early while pre-compiling

The class 'Test' of the appended test case (test.cs) has an (explicit)
class constructor. That is, in class Test's IL-code, the flag
"beforefieldinit" is not set. ECMA-335 §8.9.5 states that the class
constructor is executed at first access to any static member of that
class or at first creation of one instance of that class. The test
case is compiled by "mcs test.cs" and executed by "mono test.exe". 
The expected (and correct) output is:

Starting Main
In type initializer
After echo
After field access

When executing the programm with "mono -O=precomp test.exe" by Mono-2.6.1,
the incorrect output is:

In type initializer
Starting Main
After echo
After field access

That is, the class constructor is called while pre-compiling. Even worse,
Mono crashes while pre-compiling (tested on Linux and Mac OS X) with
an assertion failure in method-to-ir.c:684.
Comment 1 Zoltan Varga 2012-01-26 14:07:30 UTC
-O=precomp is not really supported, I don't even remember why we added it.
Comment 2 Zoltan Varga 2012-01-26 14:08:02 UTC
If you want to precompile code, use AOT.