Last week, I've written a small trace compiler (at least a kind of) for
phpreboot.
For those who did not attend to last JVM Summit, here is the basics:
http://wiki.jvmlangsummit.com/Trace-based_JIT
In my case, phpr is an interpreter written in Java.
it basically parses an instruction or a block, create the corresponding AST
and interpret it by walking on the AST.
It also comes with a compiler that transform function and lambda
directly into bytecode.
I use JSR292 method handles to jump back and forth between the interpreter
and the compiled code.
During last week, I've written a trace compiler which compile a while loop
during its execution. I've added a counter that count each iteration
and when the counter overflow, it compiles the test of the loop
and its body into a bytecode blob and execute it.
Furthermore, during the first runs, I record the runtime type of the
variables
so when I generate the loop body, I use these information to specialize
the generated bytecode (mainly in order to remove all boxing).
And it works very well !
I wonder if someone had already tried to do the same with its own JVM
Language ?
For the curious, the source are here:
http://code.google.com/p/phpreboot/source/browse/trunk/phpreboot/src/com/googlecode/phpreboot/compiler
<http://code.google.com/p/phpreboot/source/browse/trunk/phpreboot/src/com/googlecode/phpreboot/compiler/Compiler.java>
Rémi
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