Loading classes in runtime

[dlangBugzillaToGithub]

Roman reported this on 2013-07-26T17:37:00Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=10719

CC List

• Steve Teale

Description

There is kinda plugin here (code is for linux or other posix system with dlfcn)
Why does it crush when using interface instead of abstract class? (-version=inter)

//dinter.d
module dinter;

version(inter) {
    pragma(msg, "Using interface");
    interface Dinter {
        int foo(int a, int b);
    }
}
else {
    pragma(msg, "Using abstract class");
    abstract class Dinter {
        int foo(int a, int b);
    }
}

//dimpl.d
//dmd -shared -fPIC dimpl.d dinter.d -oflibdimpl.so
//dmd -shared -fPIC dimpl.d dinter.d -oflibdimpl.so -verstion=inter
module dimpl;
import dinter;

class Dimpl : Dinter {
    override int foo(int a, int b) {
        return a+b;
    }
}
extern(C) Dinter create() {
    return new Dimpl;
}

//dmain.d
//dmd dmain.d -L-rpath=. -L-ldl
//dmd dmain.d -L-rpath=. -L-ldl -version=inter

import dinter;
import std.c.linux.linux;
import std.string : toStringz;

alias extern(C) Dinter function() CreateFn;

int main(string[] args) {
    void* lib = dlopen(toStringz("./libdimpl.so"), RTLD_LAZY);
    assert(lib);
    auto create = cast(CreateFn)dlsym(lib, toStringz("create"));
    assert(create);
    Dinter d = create();
    assert(d.foo(3,7)==10);
    return 0;
}

[dlangBugzillaToGithub]

ssteale commented on 2014-03-14T04:54:38Z

This does not appear to be an all platforms issue. I have similar code and mine appears to work on a 64 bit system and fail on 32 bit, which in some ways is more serious.

[dlangBugzillaToGithub]

ssteale commented on 2014-03-14T05:23:13Z

Checked with code included in bug report - OK with 2.064 64 bit - fails with 32 bit.