Tracing in compiler / Tracing AOT compiled code (w/ patch)
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Key: JRUBY-1531
URL: http://jira.codehaus.org/browse/JRUBY-1531
Project: JRuby
Issue Type: Bug
Reporter: Peter Brant
Assignee: Thomas E Enebo
Attachments: tracing.patch
(related to JRUBY-1286 and JRUBY-1475)
Attached is the first version of the compiler tracing patch. If
-Djruby.tracing.enabled=true, invokers get an additional MethodVisitor that
adds c-call/c-return or call/return events to the generated code. Along the
same line, compiled methods get line events and class/end events. If the
property isn't set, the generated bytecode is the same as today.
For AOT compiled code, the same transformations are done at class load time
with the addition that methods that use stack-based local variables are
rewritten to use heap-based local variables.
The online/JIT side of things should be pretty solid. All tests pass with
tracing enabled (or at least the ones that did before do). The AOT side of
things is more experimental and needs more discussion. I'm not sure what the
repercussions are of loading in Scripts via a custom classloader vs. the
calling classloader as before. The bytecode rewriting is a bit fragile
inasmuch as it depends on internal compiler details (although I'm not sure much
can be done about this).
It does work for me though (actually pretty cool to step into .class files...)
Also, tracing in the interpreter is still broken if jruby.tracing.enabled is
not set. IMO, either tracing should work out of the box with the interpreter
or jruby.tracing.enabled=false should disable all events, not just some (i.e.
c-call/c-return) like now.
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