scala/scala3

Improve debugging support by implementing JSR-45

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#9,715 opened on Sep 3, 2020

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area:backendcompat:scala2help wanteditype:enhancement

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Description

We should port https://github.com/scala/scala/pull/9121, note that unlike scala 2 we don't have a backend inliner (yet) but we do have inline def so we need to deal with positions coming from other files, this is currently handled by https://github.com/lampepfl/dotty/blob/cdfc76e2e5093dd8f70e1d582e38d2537494c0bb/compiler/src/dotty/tools/dotc/typer/Inliner.scala#L239-L240

Contributor guide

Research direction
Study the referenced Scala 2 PR and the existing position handling in dotty's Inliner, then implement JSR 45 support for source file mapping in generated bytecode.
Tech stack
scala
Domain
compilers
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
Scalacompiler internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35