546f6dbc - c-api: implement wasm_tagtype_t for exception tag types (#10252) (#12763)

Thu, 12 Mar 2026 17:09:57 +0000

c-api: implement wasm_tagtype_t for exception tag types (#10252) (#12763)* c-api: implement wasm_tagtype_t for exception tag types (#10252)Implement the C embedder API for WebAssembly exception tags, resolvingthe long-standing todo!() in CExternType::new() that caused a Rust panicwhenever a module with tag exports had its exports enumerated via theC API (e.g. wasm_module_exports / wasmtime_module_exports).Changes:- Add wasm_tagtype_t type with wasm_tagtype_new/params/delete/copy and the standard as_externtype / externtype_as_tagtype cast functions- Add WASM_EXTERN_TAG = 4 constant to wasm_externkind_enum in wasm.h- Add CExternType::Tag(CTagType) variant; wire into CExternType::new() and wasm_externtype_kind()- Add wasmtime/types/tag.hh C++ wrapper (TagType / TagType::Ref)- Extend ExternType::Ref variant and ref_from_c() switch in extern.hh- Add TagType tests: construction, module export enumeration (regression for #10252), and wasm_externtype_kind / cast function correctnessCo-Authored-By: Claude Sonnet 4.6 * c-api: move tag type declarations to wasmtime/tag.h- Revert wasm.h to its vendored upstream state (it must not be modified locally; tag support is not yet in the upstream wasm-c-api spec header)- Add crates/c-api/include/wasmtime/tag.h with wasm_tagtype_t forward declaration, WASM_EXTERN_TAG constant, and all wasm_tagtype_* / wasm_externtype_as_tagtype* function declarations- Include wasmtime/tag.h from wasmtime.hCo-Authored-By: Claude Sonnet 4.6 * Apply rustfmt and clang-format to tag type implementationCo-Authored-By: Claude Sonnet 4.6 * Fix Clippy warnings: remove unused imports and dead codeDrop unused `wasm_tagtype_t` import from extern.rs, and remove the`force`/`ty`/`wasm_tagtype_t::new` dead-code paths from tag.rs thatwere written for future engine-resolution support but are not yet called.Co-Authored-By: Claude Sonnet 4.6 * Redesign tag type API with wasmtime_* prefix per reviewer feedback- Rename wasm_tagtype_t → wasmtime_tagtype_t and all wasm_tagtype_* functions → wasmtime_tagtype_* to avoid clashing with future wasm.h additions (as requested by alexcrichton)- Constructor now takes wasm_engine_t* + wasm_valkind_t array + count instead of wasm_valtype_vec_t, eliminating the lazy-init complexity- Replace wasm_tagtype_params() (returning a vec) with wasmtime_tagtype_param_count() + wasmtime_tagtype_param(nth), matching the component type accessor iterator pattern- Rename WASM_EXTERN_TAG → WASMTIME_EXTERN_TAG- Simplify CTagType: stores TagType directly, no Arc>- Update C++ TagType wrapper: constructor takes Engine&, Ref exposes param_count() / param(nth) instead of params() returning ListRef- Add ValType::c_to_kind() static helper used by TagType::Ref::param()- Fix null-pointer panic for zero-length param arrays in RustCo-Authored-By: Claude Sonnet 4.6 ---------Co-authored-by: Claude Sonnet 4.6 List of files: /wasmtime-44.0.1/crates/c-api/include/wasmtime/types.hh

62f60665 - Move various C++ type-related items to their own header (#10627)

Mon, 21 Apr 2025 23:30:54 +0000

Move various C++ type-related items to their own header (#10627)* Move C++ `ValType` to its own headerAnd fill out some small tests* Move C++ `GlobalType` to its own header* Move C++ `TableType` to its own fileWith some small tests* Move C++ `FuncType` to its own file* Move C++ ImportType to its own file* Move C++ `ExportType` to its own file* Move C++ `ExternType` to its own file List of files: /wasmtime-44.0.1/crates/c-api/include/wasmtime/types.hh

34e2e54d - Move C++ `MemoryType` to its own header (#10623)

Mon, 21 Apr 2025 21:51:28 +0000

Move C++ `MemoryType` to its own header (#10623)While here fill out its API a bit with a builder type and some tests. List of files: /wasmtime-44.0.1/crates/c-api/include/wasmtime/types.hh

Changes in types.hh

546f6dbc - c-api: implement wasm_tagtype_t for exception tag types (#10252) (#12763)

62f60665 - Move various C++ type-related items to their own header (#10627)

34e2e54d - Move C++ `MemoryType` to its own header (#10623)