Introduce staged lowering of Swift to `@_cdecl` Swift to C#214

Merged

DougGregor merged 15 commits intoswiftlang:mainfrom DougGregor:c-type-lowering

Feb 5, 2025

+2,058-742

Commits on Jan 31, 2025

Commits on Feb 3, 2025

Use placeholders rather than parameter names in cdecl-to-swift sequences
DougGregor
committed
Move "self" parameter to the end of the @_cdecl thunk
DougGregor
committed
Factor out the lowering step as a more general "ConversionStep"
DougGregor
committed
Separate Swift-to-cdecl parameter lowering from the conversion sequences
DougGregor
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Rework handling of returns in cdecl thunks to handle more types
DougGregor
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Lower initializers and static methods to C declarations
DougGregor
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cdecl lowering: move indirect returns after self
DougGregor
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cdecl thunks: property initialize indirect returns via initialize(to:)
DougGregor
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Always mark @cdecl thunks we generate in lowering as public
DougGregor
committed
Leverage the direct Swift cdecl type <-> C type mapping for lowering
DougGregor
committed

Commits on Feb 4, 2025