Thread overview
Would APEs work with D?
May 17

Hello,

assuming that I have little experience with assembly, so I couldn't check if the ape.S is actually compatible, and that I also still have little experience with D:

I was reading this very interesting article and while reading it I had the impression that it would be possible to produce D APEs.

It does require some ABI changes as far as I can tell, but I think that excluding Phobos (since it would require more work to get started) a simple hello world using Cosmopolitan would do the job (maybe we could have more complex code compiling with @pragma(mangle) for ABI compatibility and interop).

If we look at Cosmopolitan's hello.c:

/* Compile with:
gcc -g -O -static \
  -fno-pie -no-pie -mno-red-zone -nostdlib -nostdinc \
  -o hello.com hello.c \
  -Wl,--oformat=binary -Wl,--gc-sections -Wl,-z,max-page-size=0x1000 -fuse-ld=bfd \
  -Wl,-T,ape.lds \
  -include cosmopolitan.h \
  crt.o ape.o cosmopolitan.a
*/

#include "libc/stdio/stdio.h"

int main() {
  printf("%s\n", "hello world");
  return 0;
}

My guess is that we could produce a portable executable with Cosmopolitan and thus write something like this in our hello.d:

/* I am not sure how would we compile this, but
 * I guess it's going to be something like:
gdc -g -O -static \
  -fno-pie -fuse-ld=bfd -mno-red-zone
  -fno-druntime
  -o hello.com hello.d
  -Wl,--oformat=binary -Wl,--gc-sections -Wl,-z,max-page-size=0x1000 -fuse-ld=bfd \
  -Wl,-T,ape.lds
  crt.o ape.o cosmopolitan.a
 */

@pragma(lib, "cosmopolitan"); // or in dub.sdl/.json

@nogc: // I am not sure whether the default GC would work

extern(C) int printf(const char*, ...) @trusted nothrow;

extern(C) int main() {
  printf("%s\n", "hello world");

  return 0;
}

If I understand correctly, the needed steps would be:

  1. Build the binary
  2. Write PE magic number
  3. Write BIOS boot sector (if needed)
  4. Write sh compatible execution script (load executable code through qemu)
  5. Write platform-specific sections and tables (ELF, *BSD, ...)
  6. Put executable code and data sections
  7. PKZIP magic (if needed)

What do you think about it?

May 18

On Monday, 17 May 2021 at 11:08:33 UTC, Raimondo Mancino wrote:

>

My guess is that we could produce a portable executable with Cosmopolitan and thus write something like this in our hello.d:

/* I am not sure how would we compile this, but
 * I guess it's going to be something like:
gdc -g -O -static \
  -fno-pie -fuse-ld=bfd -mno-red-zone
  -fno-druntime
  -o hello.com hello.d
  -Wl,--oformat=binary -Wl,--gc-sections -Wl,-z,max-page-size=0x1000 -fuse-ld=bfd \
  -Wl,-T,ape.lds
  crt.o ape.o cosmopolitan.a
 */

What do you think about it?

The command would be pretty much the same as gcc (-nostdinc -nostdlib), but instead of -include cosmopolitan.h, you'd pass a cosmopolitan binding module (importC may solve the need for that), and a minimal (possibly empty) object.d to satisfy the compiler's need to have an object module.

May 18

On Tuesday, 18 May 2021 at 08:40:10 UTC, Iain Buclaw wrote:

>

On Monday, 17 May 2021 at 11:08:33 UTC, Raimondo Mancino wrote:

>

[...]

The command would be pretty much the same as gcc (-nostdinc -nostdlib), but instead of -include cosmopolitan.h, you'd pass a cosmopolitan binding module (importC may solve the need for that), and a minimal (possibly empty) object.d to satisfy the compiler's need to have an object module.

Brace yourself... ImportC is coming.