Eli Bendersky 11/25/2025

Notes on the WASM Basic C ABI

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This technical article provides detailed notes on the WebAssembly Basic C ABI, a standard for representing C programs in WASM used by compilers like Clang and Rust. It explains core concepts like the WASM value stack versus linear memory stack, and includes annotated code samples showing how scalar types (int, char) and pointers are passed and returned according to the ABI specification.

Notes on the WASM Basic C ABI

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