IL2CPP: member reference base type 'void' is not a structure or union - Unity Engine

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I’m currently porting my project to PS4 and this is the first time I get to play with IL2CPP, so I am kind of happy! Unfortunately, there’s a compilation error that doesn’t tell me enough to understand how to fix it:

Temp\StagingArea\Data\il2cppOutput\Bulk_OpenCvSharp_0.cpp:1393:21: error: member reference base type ‘void’ is not a structure or union
int32_t L_2 = (L_1->___type_0);

So … how do I go about figuring out what IL2CPP is choking on?

jashan:

Temp\StagingArea\Data\il2cppOutput\Bulk_OpenCvSharp_0.cpp:1393:21: error: member reference base type ‘void’ is not a structure or union
int32_t L_2 = (L_1->___type_0);

So … how do I go about figuring out what IL2CPP is choking on?

@jashan

This looks like a bug in IL2CPP; it should never generate C++ code that does not compile. Which version of Unity are you using? Also, you should be able to look above this generated C++ code a bit to find the top of the C++ function. One line above that should be a C++ comment that lists the name of the managed method which was converted to this C++ code.

If possible, can you submit a bug report and include a Unity project that causes this issue? We would like to track down the cause and correct it.

@jashan

If possible, can you submit a bug report and include a Unity project that causes this issue? We would like to track down the cause and correct it.

Hi Josh!

It is in fact a bug in IL2CPP that at least disregards pointer type casts in unsafe code.
If you want a simple test case (tested in v5.5), try building an empty project with a single cs file containing:

public unsafe static class clss
    public struct strct { public int fld; }
    public static int fnctn0(strct* p) { return p->fld; } 
    public static int fnctn1(void* p) { return ((strct*)p)->fld; }
    public static int fnctn2(System.IntPtr p) { return ((strct*)p)->fld; }
Don’t forget “-unsafe” in gmcs.rsp/smcs.rsp
You’ll get errors that don’t help too much but, after looking in Editor.log, I ran the compiler command to look at the real errors and it came out as:
C:\src\IL2CPPBug\Temp\StagingArea\Il2Cpp\il2cppOutput\Bulk_Assembly-CSharp_0.cpp:52:20: error: member reference base type ‘void’ is not a structure or union

int32_t L_1 = L_0->get_fld_0();
C:\src\IL2CPPBug\Temp\StagingArea\Il2Cpp\il2cppOutput\Bulk_Assembly-CSharp_0.cpp:63:20: error: member reference base type 'void' is not a structure or union
int32_t L_2 = L_1->get_fld_0();
~~~^ ~~~~~~~~~
Looking at the generated cpp you’ll get a file that includes something like:
// System.Int32 clss::fnctn0(clss/strct*)
extern "C"  int32_t clss_fnctn0_m2853177143 (Il2CppObject * __this /* static, unused */, strct_t1948202050 * ___p0, const MethodInfo* method)
        strct_t1948202050 * L_0 = ___p0;
        NullCheck(L_0);
        int32_t L_1 = L_0->get_fld_0();
        return L_1;
// System.Int32 clss::fnctn1(System.Void*)
extern "C"  int32_t clss_fnctn1_m1622945435 (Il2CppObject * __this /* static, unused */, void* ___p0, const MethodInfo* method)
        void* L_0 = ___p0;
        NullCheck(L_0);
        int32_t L_1 = L_0->get_fld_0();
        return L_1;
// System.Int32 clss::fnctn2(System.IntPtr)
extern "C"  int32_t clss_fnctn2_m151773759 (Il2CppObject * __this /* static, unused */, IntPtr_t ___p0, const MethodInfo* method)
        IntPtr_t L_0 = ___p0;
        void* L_1 = IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
        NullCheck(L_1);
        int32_t L_2 = L_1->get_fld_0();
        return L_2;
The first fnctn0 works out ok because you have a pointer to the struct, but fnctn1 and fnctn2 clearly lack the cast made in the CSharp code, thus loosing the struct info and causing the error while trying to access a field of a null pointer.

By making the following correction the cpp code compiles:
In fnctn1:
        //void* L_0 = ___p0;
        strct_t1948202050 * L_0 = (strct_t1948202050 *)___p0;
In fnctn2:
        //void* L_1 = IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
        strct_t1948202050 * L_1 = (strct_t1948202050 *)IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
I hope this steers you guys in the right direction because there are a lot of cool projects that use unsafe casts that will start working with Unity’s IL2CPP as soon as you fix this 
Happy Hunting!
Hi Josh!
It is in fact a bug in IL2CPP that at least disregards pointer type casts in unsafe code.

If you want a simple test case (tested in v5.5), try building an empty project with a single cs file containing:
public unsafe static class clss
    public struct strct { public int fld; }
    public static int fnctn0(strct* p) { return p->fld; }
    public static int fnctn1(void* p) { return ((strct*)p)->fld; }
    public static int fnctn2(System.IntPtr p) { return ((strct*)p)->fld; }
Don’t forget “-unsafe” in gmcs.rsp/smcs.rsp
You’ll get errors that don’t help too much but, after looking in Editor.log, I ran the compiler command to look at the real errors and it came out as:
Looking at the generated cpp you’ll get a file that includes something like:
// System.Int32 clss::fnctn0(clss/strct*)
extern "C"  int32_t clss_fnctn0_m2853177143 (Il2CppObject * __this /* static, unused */, strct_t1948202050 * ___p0, const MethodInfo* method)
        strct_t1948202050 * L_0 = ___p0;
        NullCheck(L_0);
        int32_t L_1 = L_0->get_fld_0();
        return L_1;
// System.Int32 clss::fnctn1(System.Void*)
extern "C"  int32_t clss_fnctn1_m1622945435 (Il2CppObject * __this /* static, unused */, void* ___p0, const MethodInfo* method)
        void* L_0 = ___p0;
        NullCheck(L_0);
        int32_t L_1 = L_0->get_fld_0();
        return L_1;
// System.Int32 clss::fnctn2(System.IntPtr)
extern "C"  int32_t clss_fnctn2_m151773759 (Il2CppObject * __this /* static, unused */, IntPtr_t ___p0, const MethodInfo* method)
        IntPtr_t L_0 = ___p0;
        void* L_1 = IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
        NullCheck(L_1);
        int32_t L_2 = L_1->get_fld_0();
        return L_2;
The first fnctn0 works out ok because you have a pointer to the struct, but fnctn1 and fnctn2 clearly lack the cast made in the CSharp code, thus loosing the struct info and causing the error while trying to access a field of a null pointer.

By making the following correction the cpp code compiles:
In fnctn1:
        //void* L_0 = ___p0;
        strct_t1948202050 * L_0 = (strct_t1948202050 *)___p0;
In fnctn2:
        //void* L_1 = IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
        strct_t1948202050 * L_1 = (strct_t1948202050 *)IntPtr_op_Explicit_m1073656736(NULL /*static, unused*/, L_0, /*hidden argument*/NULL);
I hope this steers you guys in the right direction because there are a lot of cool projects that use unsafe casts that will start working with Unity’s IL2CPP as soon as you fix this 
Happy Hunting!
@BugHunter666
Thanks for this detailed analysis! Would you like to submit a bug report so that we can let you know when this is corrected? If not, there is enough here for me to submit the bug report, but I wanted to give you the chance sot that we can complete the feedback loop when the bug is corrected.