Sergey Bogolepov
fe9ab0a1fc
Add a sir-compiler-bridge module that adds Kotlin and C bridges for SIR. As SIR is still WIP, the module accepts `BridgeRequest` instances instead of SIR elements.
18 lines
1.0 KiB
Markdown
18 lines
1.0 KiB
Markdown
# Swift IR to Kotlin compiler bridges
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This module is responsible for the generation of "glue" code between Swift Export and Kotlin compiler.
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Swift does not "know" how to call Kotlin directly. But it has a C/C++/Objective-C interop, and we can leverage it for Swift Export.
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We do the following:
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1. Generate a Kotlin wrapper around the original Kotlin function with a primitive C-like ABI.
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2. Generate a C header with C declarations of these wrappers.
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3. Call these C functions from Swift functions.
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That's it! This approach also has the following advantages:
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1. All nuances of Kotlin compiler and Kotlin/Native runtime are hidden behind wrappers with a simple ABI.
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So Swift Export (mostly) does not need to care about how Kotlin/Native works under the hood.
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2. The contract between Swift Export and Kotlin compiler is well-defined in the form of a set of compiler intrinsics.
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For the sake of simplicity, Kotlin wrappers are generated as Kotlin sources,
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but later we can switch to direct generation of Kotlin Backend IR. |