alt Hacker NewsJVM does a lot of escape analysis to turn heap allocated memory into stack local variables.
It doesn't matter if it's local since it's a VM, it's doing it at runtime and can change an entire call stack of non local code for an optimization.
JVM does a lot of escape analysis to turn heap allocated memory into stack local variables.
It doesn't matter if it's local since it's a VM, it's doing it at runtime and can change an entire call stack of non local code for an optimization.
Some fact correcting, first of all while most people refer to "The JVM", most likely impling OpenJDK, Java is a standard and there are many implementations.
Which exactly in this subject varies a lot between implementations, on how well escape analysis is done, if there is a JIT cache between JVM executions, or AOT compilation.
Additionally Valhalla is finally getting added to the language with a new EA made available last week, thus value classes will add yet another way to have stack values.