Compile Time Garbage Collection impossible?

the.real.doctor.zoidberg@gmail.com
22 Sep 2006 22:29:03 -0400

          From comp.compilers

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From: the.real.doctor.zoidberg@gmail.com
Newsgroups: comp.compilers
Date: 22 Sep 2006 22:29:03 -0400
Organization: Compilers Central
Keywords: GC, question

Why isn't Compile-Time-Garbage-Collection feasible? Consider a Java
compiler which produces assembly code for a specific target instead of
Java's bytecode cenario. The objective is to use Java without the need
for a GC or VM.


I'm asking why it isn't possible because otherwise there would be at
least one compiler to use that technique, instead of having to run a
GC in the VM.


When a program is compiled, the compiler has to transverse all its
code to ensure type safety (for safe languages), so what would be the
problem in "freeing" objects after their scope, or even better, after
the last reference in their scope?


Thank you for any insight on this matter.
[Local objects are usually stack allocated and freed at end of scope.
You need GC when you do dynamic allocation, and chain stuff into lists
and trees of data structures. -John]



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