[LLDB] Set up an explicit Swift module loader #11834
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and populate it with explicitly specified Swift modules. This change allows LLDB to precisely load the explicitly built main module belonging to the current CU from disk. The mere presence of an ESML also recursively enables the same behavior for all of its dependencies, since that functionality is already implemented in the Swift compiler. This fixes a performance cliff encountered when debugging with dSYMs which contain all user modules, but none from the SDK, thus triggering an implicit build of any SDK dependencies. During the transition period this behavior can be disabled with a setting. rdar://164274588
adrian-prantl
requested review from
artemcm,
augusto2112,
cachemeifyoucan and
kastiglione
and removed request for
JDevlieghere
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Set up an explicit Swift module loader
and populate it with explicitly specified Swift modules.
This change allows LLDB to precisely load the explicitly built main
module belonging to the current CU from disk. The mere presence of an
ESML also recursively enables the same behavior for all of its
dependencies, since that functionality is already implemented in the
Swift compiler.
This fixes a performance cliff encountered when debugging with dSYMs
which contain all user modules, but none from the SDK, thus triggering
an implicit build of any SDK dependencies.
During the transition period this behavior can be disabled with a setting.
rdar://164274588
Depends on:
#11833
swiftlang/swift#85519
swiftlang/swift-driver#2012