wasmtime component bindgen: when tracing is enabled, emit an event for args & results #6209
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…r arguments and results This is consistient with what wiggle does (see https://github.com/bytecodealliance/wasmtime/blob/main/crates/wiggle/generate/src/funcs.rs#L266), with the exceptions that 1. wiggle has a facility for disabling tracing on a per-function basis, a requirement which was driven by functions which pass secrets into wasm. this will be added to wasmtime-wit-bindgen at a later date. 2. wiggle doesn't actually emit an event when calling a function which takes no arguments (see `&& func.params.len() > 0` in predicate), in this case we emit an event with the body `"call"`, to ensure these calls are observable.
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…r args & results (bytecodealliance#6209) * wasmtime component bindgen: when tracing is enabled, emit an event for arguments and results This is consistient with what wiggle does (see https://github.com/bytecodealliance/wasmtime/blob/main/crates/wiggle/generate/src/funcs.rs#L266), with the exceptions that 1. wiggle has a facility for disabling tracing on a per-function basis, a requirement which was driven by functions which pass secrets into wasm. this will be added to wasmtime-wit-bindgen at a later date. 2. wiggle doesn't actually emit an event when calling a function which takes no arguments (see `&& func.params.len() > 0` in predicate), in this case we emit an event with the body `"call"`, to ensure these calls are observable. * review feedback: add call and return messages to events * consistiency: dont drop `guest` from `wit-bindgen guest export` in span
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This is consistient with what wiggle does (see
https://github.com/bytecodealliance/wasmtime/blob/main/crates/wiggle/generate/src/funcs.rs#L266), with the exceptions that
&& func.params.len() > 0in predicate), in this case we emit an event with the body"call", to ensure these calls are observable.