Re: [ooc-compiler] Application compile runtime error

[Michael v. A. <Mic...@de...>]

Frank Hrebabetzky <fh...@ph...> writes:

> When trying to compile my application ("oo2c testmpp.Mod"), the response is
> 
> ## Runtime error in module OOC:SSA:WriteC at pos 13856
> ## Dereference of NIL
> 
> I am using oo2c_32-2.1.3 under WindowsXP / MingW / MSYS. My program (I
> attached it just in case) has grown pretty large, so just a hint about
> the kind of statement that is bothering, where to look for what, would
> help.

The assigment with SYSTEM.VAL fails.  The following workaround should
preserve your intended semantics without crashing the compiler.

--- testmpp.Mod.orig    Wed Jul  7 10:13:50 2004
+++ testmpp.Mod Wed Jul  7 10:24:29 2004
@@ -118,7 +118,8 @@
     END
   ELSIF str="MOVE" THEN
     cmd:= MOVE;
-    cs:= SYSTEM.VAL(CharSeq, par1);  par1:= ORD(cs[0]);  par2:= ORD(cs[1]);
+    SYSTEM.MOVE(SYSTEM.ADR(par1), SYSTEM.ADR(cs), SIZE(INTEGER));
+    par1:= ORD(cs[0]);  par2:= ORD(cs[1]);
   ELSIF str="MOVREF" THEN cmd:= MOVREF
   ELSIF str="WAIT" THEN
     IF par1<0 THEN cmd:= ERRCMD

I will need to investigate further why this application of VAL does
not work.  If necessary, I will turn this particular scenario into a
compile time error.

-- mva