[Mono-bugs] [Bug 667928] New: icalls with Rects as return types call native functions incorrectly.

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https://bugzilla.novell.com/show_bug.cgi?id=667928

https://bugzilla.novell.com/show_bug.cgi?id=667928#c0


           Summary: icalls with Rects as return types call native
                    functions incorrectly.
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.8.x
          Platform: i386
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: JIT
        AssignedTo: lupus at novell.com
        ReportedBy: lucas.meijer at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_6; en-US)
AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.237 Safari/534.10

Run test.cpp against test.cs,

test.cpp segfaults when doing mono_object_get_class(instance),  however
instance should be pointing at a valid MonoObject.   kumpera asked me to file a
bugreport, and mentioned it's related to having structs as return types.



Reproducible: Always

Steps to Reproduce:
run this test.cpp:

#include <glib.h>
#include <mono/jit/jit.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/mono-gc.h>
#include <mono/metadata/class.h>


struct Rectf
{
        float top,left,width,height;
};

static Rectf FitScreen(MonoObject* instance, Rectf input, bool a, bool b)
{
        //This crashes because instance points to what looks like randomness.
        mono_object_get_class(instance);

        Rectf r;
        return r;
}

int main()
{
        MonoDomain* domain = mono_jit_init_version ("Unity Root Domain",
"v2.0.50727");
        MonoMethodDesc* desc = mono_method_desc_new("Test:doit",1);
        MonoAssembly* ass = mono_domain_assembly_open (mono_domain_get (),
"test.dll");
        MonoImage* img = mono_assembly_get_image(ass);
        MonoMethod* m = mono_method_desc_search_in_image(desc,img);

        mono_add_internal_call ("Test::FitScreen", (void*)FitScreen);

        MonoObject* exc;
        MonoObject* ret = mono_runtime_invoke(m,0,0,&exc);
        return 0;
}



against this test.dll:

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential)]
struct Rect
{
        public  float left,top,width,height;
}

public class Test
{
        static void doit()
        {
                Rect rect = new Rect();
                var instance = new Test();
                FitScreen(instance,rect,false,false);
        }

        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        extern static Rect FitScreen (Test instance, Rect input, bool
something, bool somethingelse);
}
Actual Results:  
crash

Expected Results:  
no crash

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