interpreter or compiler ?

Duke Normandin — Wed, 08 Mar 2023 02:23:25 -0000

Thx Gautier. I used -I<fullpath to="" hat.ads=""> ! Worked liked a hot damn!! Thx. I did it all from emacs even though I can't get ada-mode to work properly.</fullpath>

interpreter or compiler ?

Gautier de Montmollin — Wed, 08 Mar 2023 01:23:37 -0000

Almost there! If your hello_world2.adb is, say, in HAC's top directory, you can type gnatmake -Isrc hello_world2.adb.
Furthermore, if you go to the exm directory and type gprbuild, GNAT will compile 42 HAC examples just like that!

interpreter or compiler ?

Duke Normandin — Tue, 07 Mar 2023 22:56:31 -0000

with Hat;
procedure Hello_World2 is
use Hat;
begin
Put("Hello world!");
Put_Line("");
end Hello_World2;

Tried to compile the above with gnatmake! No joy!

gnatmake hello_world2.adb
gcc -c hello_world2.adb
hello_world2.adb:1:06: error: file "hat.ads" not found
gnatmake: "hello_world2.adb" compilation error

interpreter or compiler ?

Gautier de Montmollin — Tue, 07 Mar 2023 18:29:54 -0000

What compiles with HAC compiles with GNAT (or another Ada compiler). No edit needed. And it's not Pascal, it's Ada :-)

interpreter or compiler ?

Duke Normandin — Tue, 07 Mar 2023 16:42:44 -0000

In a post above you said:

you can switch your sources from HAC to GNAT(or another full Ada system) and vice versa (as long as you stay in HAC's language subset of course) any time.

What did you mean by that specifically please? Simply that the Pascal source code can be edited to suit either GNAT or HAC?

interpreter or compiler ?

Gautier de Montmollin — Tue, 07 Mar 2023 06:38:26 -0000

gnatmake drives the GNAT compiler which produces a native executable.
GNAT and HAC are completely different compilers. Currently HAC produces only an executable for a virtual machine (this is similar to Python for instance).
The HAC-generated executable is not written into any file.
In future versions of HAC, binary code might be also written on the disk and HAC might be able to generate native machine code, which would be also very compact.

interpreter or compiler ?

Duke Normandin — Tue, 07 Mar 2023 06:10:20 -0000

I just installed HAC and had the same question as the OP. What do I need to do to the HAC code for it to compile into an executable using `gnatmake'? Merci!

interpreter or compiler ?

Gautier de Montmollin — Mon, 08 Jun 2020 19:39:07 -0000

Yep. The difference is that you can switch your sources from HAC to GNAT(or another full Ada system) and vice versa (as long as you stay in HAC's language subset of course) any time.

interpreter or compiler ?

Patrick McCavery — Mon, 08 Jun 2020 16:27:15 -0000

ah, I get it. It is not python or c but more like java then..

Thanks

interpreter or compiler ?

Gautier de Montmollin — Mon, 08 Jun 2020 12:34:26 -0000

Hi Pat,
Answer to first question: right!
Answer to second question: it's a bit more subtle. It produces an executable for a virtual machine. This VM starts, runs and stops in memory. The machine code for that VM is interpreted, like for other VMs or for emulating processor X on processor Y. So you'll find in HAC a compiler (see src/compile) and an interpreter for the machine code produced by the compiler (see src/execute).

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