• d-bugmail puremagic.com (59/59) Mar 23 2019 https://issues.dlang.org/show_bug.cgi?id=19759

d-bugmail puremagic.com writes:

https://issues.dlang.org/show_bug.cgi?id=19759

          Issue ID: 19759
           Summary: compiler crash when passing static array to function
                    with C++ linkage
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: simon.vanbernem yahoo.de

DMD crashes, when I try to pass a static array to an extern(C++) function. The
promt asked me to report this crash, so I did, but I am a bit baffled that the
error message is fully aware of what went wrong and asks me to use a pointer
instead. I don't exactly see how this workaround would help though, since I
can't change the function signature because of name-mangling, and if I just
pass a pointer to the unchanged function, the type system will of course
complain. I think the only way forward right now is to switch to C-linkage, so
that function-mangling doesn't happen? That would be pretty annoying, since
there are other overloads in the library I am using, and so I would have to
provide some wrapper for that.

The minimal example reads as follows: 

-----------------Code----------------------
extern(C++) bool fail(float[4] col);

void main(){
        float[4] array = [0, 1, 2, 3];
        fail(array);
}
-----------------Code----------------------

----------Compiler Output------------------
dmd repro.d
Error: Internal Compiler Error: unable to pass static array to extern(C++)
function.
Error: Use pointer instead.
---
ERROR: This is a compiler bug.
Please report it via https://issues.dlang.org/enter_bug.cgi
with, preferably, a reduced, reproducible example and the information below.
DustMite (https://github.com/CyberShadow/DustMite/wiki) can help with the
reduction.
---
DMD v2.084.1

predefs   DigitalMars Windows CRuntime_DigitalMars CppRuntime_DigitalMars
LittleEndian D_Version2 all D_InlineAsm D_InlineAsm_X86 X86 Win32 assert
D_ModuleInfo D_Exceptions D_TypeInfo D_HardFloat
binary    C:\Program Files\D\dmd2\windows\bin\dmd.exe
version   v2.084.1

config    C:\Program Files\D\dmd2\windows\bin\sc.ini
DFLAGS    '-IC:\Program Files\D\dmd2\windows\bin\..\..\src\phobos'
'-IC:\Program Files\D\dmd2\windows\bin\..\..\src\druntime\import'
---

object.Error (0): Illegal Instruction
----------------
0x004323EB
----------Compiler Output------------------

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