Re: Java compiler patch: compile resource files into executables

["Anthony Green" <green at redhat dot com>]

Zack wrote:
> Let me give a simple example of the sort of code one would like to be
> able to write.

Here's an example of using `gcj -R' with a C program.  However, now that I've
given it some thought, I don't think we should document the format in user
documentation.  _Jv_RegisterResouce is part of the gcj ABI, and promoting it's
use elsewhere just seems wrong.  It certainly makes it tricky to link together
gcj code and C code using this hack.

AG


$ cat foo.c
#include <stdio.h>

void _Jv_RegisterResource (void *vptr)
{
  const char *nptr = (const char *)(vptr + 2 * sizeof(unsigned));
  int nlength = ((int *)vptr)[0];
  int dlength = ((int *)vptr)[1];
  {
    char buf[nlength + 1];
    strncpy (buf, nptr, nlength);
    buf[nlength] = 0;
    printf ("%s\t%d bytes\n", buf, dlength);
  }
}

int
main (int argc, char *argv[])
{
  puts ("done.");
}
$ gcj -R poppy -o poppy.o -c foo.c -fno-exceptions
$ gcc -o foo foo.c poppy.o
$ ./foo
/poppy  390 bytes
done.
$ ls -l foo.c
-rw-rw-r--   1 green    cygnus        390 Sep  3 14:05 foo.c