From: Dave Poirier <instinc@users.sf.net>
Subject: 64bit access to an array of 8bit values
Date: Sun, 03 Mar 2002 09:58:34 -0500
Date: 2002-03-03T09:58:34-05:00 [thread overview]
Message-ID: <3C823A1A.6030006@users.sf.net> (raw)
I'm trying to modelize a small virtual machine, and I'm stuck on the
memory model. I'm defining the memory as an array of 8bit values, so
that I am able to access every byte individually. The problem comes
when I try to access them with other data size, like 16/32/64bit. GNAT
simply refuses to do the pointer conversion (yeah, probably a bad habit).
So, what would be a "clean" way to do it? here's what I tried
------
procedure test is
type Bit8 is mod 2**8;
type Bit64 is mod 2**64;
type Bit8Acc is access Bit8;
type Bit64Acc is access Bit64;
type RamRange is range 0 .. 4000;
Ram : array (RamRange) of aliased Bit8;
Value : Bit64Acc;
begin
Value := Ram(0)'Access;
end test;
------
test.adb:14:18: expected type "Bit64Acc" defined at line 6
test.adb:14:18: found type access to "bit8" defined at line 14
and also..
------
procedure test is
type Bit8 is mod 2**8;
type Bit64 is mod 2**64;
type Bit8Acc is access all Bit8;
type Bit64Acc is access all Bit64;
type RamRange is range 0 .. 4000;
Ram : array (RamRange) of aliased Bit8;
Value : Bit64Acc;
begin
Value := Bit64Acc(Ram(0)'Access);
end test;
------
test.adb:14:12: argument of conversion cannot be access
test.adb:14:12: use qualified expression instead
I'm just a smooth skinned Ada95 newbie, so don't get too big weapons to
send replies ;)
Thanks for helping me learn :)
EKS - Dave Poirier
next reply other threads:[~2002-03-03 14:58 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-03 14:58 Dave Poirier [this message]
2002-03-03 15:38 ` 64bit access to an array of 8bit values Jim Rogers
2002-03-03 18:02 ` John R. Strohm
2002-03-03 16:39 ` Dave Poirier
2002-03-03 17:27 ` Jeffrey Creem
2002-03-05 20:49 ` John R. Strohm
2002-03-05 23:52 ` Jeffrey Creem
2002-03-06 7:30 ` John R. Strohm
2002-03-06 11:50 ` Jeffrey Creem
2002-03-07 20:03 ` John R. Strohm
2002-03-04 10:29 ` Robert Dewar
2002-03-04 13:02 ` Larry Kilgallen
2002-03-04 13:41 ` Dave Poirier
2002-03-03 22:24 ` David C. Hoos, Sr.
2002-03-03 22:51 ` Dave Poirier
2002-03-04 2:40 ` David C. Hoos, Sr.
2002-03-04 4:08 ` David Starner
2002-03-04 10:31 ` Robert Dewar
2002-03-04 18:00 ` Warren W. Gay VE3WWG
2002-03-04 3:15 ` Pat Rogers
2002-03-04 7:23 ` Jeffrey Carter
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