Re: [PR] Add a simple mechanism for runtime debugging of templates. [freemarker]

["ddekany (via GitHub)" <gi...@apache.org>]

ddekany commented on PR #89:
URL: https://github.com/apache/freemarker/pull/89#issuecomment-1859230267

   No, it can't trace lambda-ish things, as it doesn't monitor expression evaluation at all. The tracer object only called before and after "elements", like directives, interpolations, a static text blocks. If it was called for each single expression AST node, I wouldn't feel convenient about that, because 99.9...9% of users will not use this feature ever, but the extra `if (tarcet != null) { ... }` branch is there for everyone. Yes, you can be pretty sure that it's just speculatively skipped, and should have no practical performance impact, but still... who knows, both the JIT and the modern CPU-s are complex. And more importantly, since we only provide position information (and no more detailed semantics), it has limited value to go into ever more details. Probably what you care about on expression level is Java method execution speeds, but monitoring that is an `ObjectWrapper` concern.


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