Re: NEW PHP standalone compiler (was Re: [PHP-DEV] Herewe try again)

From: Date: Fri, 01 Feb 2002 11:03:24 +0000
Subject: Re: NEW PHP standalone compiler (was Re: [PHP-DEV] Herewe try again)
References: 1 2 3 4 5  Groups: php.dev 
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Manuel Lemos wrote:

Unless I'm mistaken, Java doesn't have eval.  Any language with eval
needs a runtime environment when executing, even if the rest of the code
is converted to C


I am not expert in Java (actually I don't program in Java - MetaL
generates it for me if I ever need it), but I suppose that what eval
does is what java.lang.Compiler class is for.


java.lang.compiler is a little different ...

1) Java *has* a complete runtime environment available at runtime,
   the JVM and the standard classes, that's why JVMs tend to be so
   big and have a rather large startup time overhead

2) java.lang.Compiler takes a java source file and compiles it
   into a class file, so the result is persistent and you have
   to have your code wrapped up to a complete class, write it
   to filesystem, compile it, load the compiled class into the JVM
   and then execute
   eval just executes statements within the eingine, and what
   you pass to it has to be just a complete statement, not a
   whole class



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