Re: Exec function D from C++

[Jacob Carlborg via Digitalmars-d-learn]

On 21/06/15 16:09, Sean Campbell wrote:


extern(C++) void d_initialize() {
  Runtime.initialize();
}
extern(C++) void d_terminate()
{
  Runtime.terminate();
}


These two functions are not necessary. There are already functions in 
druntime which are supposed to be called from C/C++:


extern (C) bool rt_init();
extern (C) bool rt_term();

--
/Jacob Carlborg

Re: Exec function D from C++

[Sean Campbell via Digitalmars-d-learn]

On Sunday, 21 June 2015 at 13:12:03 UTC, MGW wrote:

Linux 32, dmd 2.067.0

I want to connect and execute function D from main() C++.

 d1.d 
import core.stdc.stdio;

extern (C++) void d1() {
printf(printf - exec d1());
}

 main_c1.cpp 
#include stdio.h

void d1(void);

int main(void) {
d1();
return 0;
}

 compile 
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  ---  This option works correctly!


If I try to cause the functions connected to GC in the D 
function, there is an error.

 d1.d 
import import std.stdio;

extern (C++) void d1() {
writeln(writeln - exec d1());
}

 compile 
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  ---  Error:
'./main_c1' terminated by signal SIGSEGV (Address boundary 
error)


Examples from dmd2/html/d/dll-linux.html don't work if instead 
of printf()
to use writeln(). I think that a problem in initialization of 
Phobos.


actually its that druntime hasn't been initialized just add:
import core.runtime;
import std.stdio;

extern(C++) void d1() {
 writeln(writeln - exec d1());
}

extern(C++) void d_initialize() {
 Runtime.initialize();
}
extern(C++) void d_terminate()
{
 Runtime.terminate();
}

and the C++
#include stdio.h

void d1(void);
void d_initialize(void);
void d_terminate(void);

int main(void) {
d_initialize();
d1();
d_terminate();
return 0;
}

Exec function D from C++

[MGW via Digitalmars-d-learn]

Linux 32, dmd 2.067.0

I want to connect and execute function D from main() C++.

 d1.d 
import core.stdc.stdio;

extern (C++) void d1() {
printf(printf - exec d1());
}

 main_c1.cpp 
#include stdio.h

void d1(void);

int main(void) {
d1();
return 0;
}

 compile 
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  ---  This option works correctly!


If I try to cause the functions connected to GC in the D 
function, there is an error.

 d1.d 
import import std.stdio;

extern (C++) void d1() {
writeln(writeln - exec d1());
}

 compile 
dmd -c d1.d
gcc main_c1.cpp d1.o libphobos2.a -lpthread -o main_c1
./main_c1  ---  Error:
'./main_c1' terminated by signal SIGSEGV (Address boundary error)

Examples from dmd2/html/d/dll-linux.html don't work if instead of 
printf()
to use writeln(). I think that a problem in initialization of 
Phobos.