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Date: | 2004-09-30 (20:43) |
From: | Brian Hurt <bhurt@s...> |
Subject: | Re: [Caml-list] Primitive sizes |
On Thu, 30 Sep 2004, Jonathan Bryant wrote: > Ok. Maybe I need to make clear what I'm doing. I'm trying to write > native Java methods and have them call an OCaml library. The problem is > that I need Java compatible primitives to pass back from the methods. > In Java (ON ALL PLATFORMS), the primitives fall this way (in case you > don't know them off the top of your head): I don't know what Java's calling convention is. My advice: > Type Bits > ----- ---- > byte - 8 > short - 16 > char - 16 > boolean - 8 The above I'd just promote to ints for Ocaml, and truncate as necessary. > int - 32 I'd use Int32's. > long - 64 I'd use Int64's. > float - 32 > double - 64 I'd be inclined to promote both of these to Ocaml floats, which are 64-bit IEEE 754 floats (the same as Java's). The extra precision won't hurt anything except stupidly strict binary compatability. I assume you're using one of the Ocaml->JVM compilers kicking around. Tying Ocaml native mode (or VM) code to Java would be way too much work. -- "Usenet is like a herd of performing elephants with diarrhea -- massive, difficult to redirect, awe-inspiring, entertaining, and a source of mind-boggling amounts of excrement when you least expect it." - Gene Spafford Brian ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners