[lldb-dev] LLDB and Swift

[Todd Fiala via lldb-dev]

Hi all,

Earlier today, you may have heard that Swift went open source over at
swift.org.  I just wanted to take a moment to mention the Swift debugger
and REPL and how they relate to LLDB.

Swift’s Debugger and REPL are built on LLDB’s source-level plug-in
architecture.  As such, the Swift Debugger repository at
github.com/apple/swift-lldb naturally contains the LLDB source from llvm.org’s
LLDB repository, plus additions for Swift language support. We merge
regularly and make every attempt to minimize our differences with llvm.org’s
LLDB.  For more information on how we’re handling this, have a look at
swift.org/contributing/#llvm-and-swift.

As we’ve worked hard to make it straightforward to develop additive-only
language support in LLDB, the Swift support can readily be found by finding
the new files in the swift-lldb repository vs. those found at
llvm.org/svn/llvm-project/lldb/trunk.  For the rest of the LLDB files in
common, we do still have a small number of diffs in
github.com/apple/swift-lldb vs. llvm.org TOT.  We will work through
upstreaming these quickly.  I’ll touch on some of those differences briefly
here:

* Several minor places where full language abstraction hasn’t yet occurred,
where we’re explicitly checking for Swift-related details.  Abstracting out
those remaining places and providing the hooks in llvm.org LLDB will
benefit all languages.

* Printed-form version string handling.  The ‘lldb -v’ and ‘(lldb) version’
commands create a different version string in both Xcode and cmake-based
Swift LLDB.  We will work to incorporate this into llvm.org LLDB once the
language/component version support info is properly abstracted out.

* Test infrastructure.  There are a few places where Swift language support
(e.g. swift compiler flags, runtime support directories, etc.) are added in
order to enable building Swift-based test inferiors.  We may be able to
rearrange things to make those language-specific additions more readily
pluggable in the core LLDB test runner.

We look forward to upstreaming the differences in common files in the
coming days and weeks.

Please feel free to contact me if you have any questions.

Thanks!

-Todd
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