[fpc-devel] executing code snippets

[Michael Schnell]

Hi Linux and Java experts,

My son is about to start a project that aims to research variations in 
small code snippets that are automatically generated by a kind of compiler.

Of course he uses fpc to do the "testing system", that also includes the 
"compiler".

Now he needs to start the code snippets.  As the system needs to do 
billions of "starts" of such snippets, which are very small, saving them 
in files as an executable does not seem appropriate.

We discussed the protection features done by the MMU hardware and agreed 
to try two different ways to accomplish the task of running the code 
snippets in a "sandbox".


1) The "traditional Linux" way would be to have the main process create 
the code to be started in a RAM area *as X86-64 native code* and then 
use "fork()" with the appropriate options to start it as a newly spawned 
process. Here the question is how to use fork() (from fpc) for exactly 
this: i.e. the code area needs to be "writable data" for the parent 
process and "protected code" for the child. (Linux experts, please...)

2) The "modernistic" way would be to have the main process create the 
code to be started in a RAM area *as Java Byte code* and then call a 
Java "just-in-time" engine (as a DLL) to execute it. Here the question 
is how an already initialized, extremely lightweight Java engine can be 
called from fpc to execute a Byte Code sequence residing in the parent's 
RAM, in a protected way. (Java experts, please...)

Thanks in Advance,
-Michael

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