Remove C++-based section discovery logic.#902
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This PR removes the C++ _section_ discovery logic that's used to look up Swift's type metadata sections. Instead, we reuse the new logic used for test content sections (written in Swift.)
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grynspan
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Jan 9, 2025
| @@ -40,19 +53,12 @@ const void *_Nonnull const SWTTestContentSectionBounds[2] = { | |||
| #include <atomic> | |||
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I can probably strip down these includes now, but will leave that for another PR.
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Co-authored-by: Stuart Montgomery <smontgomery@apple.com>
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Jan 10, 2025
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This PR removes the C++ section discovery logic that's used to look up Swift's type metadata sections. Instead, we reuse the new logic used for test content sections (written in Swift.)
I did not attempt to translate to Swift the logic to extract Swift types from Swift's metadata records. This logic relies pretty heavily on precise C++ data structure layouts and uses pointer authentication as well as relative pointers. Swift does not guarantee the same structure layout as C++, nor does it provide API for pointer authentication, nor do value types in Swift have stable addresses that can be used to compute addresses from relative offsets.
Resolves #764.
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