Core WebAssembly Reference Types (externref) Support in Swift Compiler#1
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ayushshrivastv wants to merge 6 commits into
Draft
Core WebAssembly Reference Types (externref) Support in Swift Compiler#1ayushshrivastv wants to merge 6 commits into
ayushshrivastv wants to merge 6 commits into
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This draft pull request adds Core WebAssembly Reference Types (externref) Support in Swift Compiler.
Core WebAssembly provides primitive scalar and vector types such as
i32,i64,f32,f64, andv128, but higher-level types with reference semantics are typically handled via a host-managed table that maps integer indices to stored references.This pull request introduces an experimental
WasmExternreffeature in the Swift standard library, including correct lowering of operations to the appropriate LLVM IR address space and type-checker semantics aligned with Clang’s__externref_t.As stretch goals, it also proposes exposing WebAssembly externref table builtins similar to Clang’s
__builtin_wasm_table_functions and adding aWasmExternrefIndextype to wrap externref table indices for use in Swift’s common values address space.