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Does anyone know of a list of functions which are available to call from WebAssembly when running in a modern web browser?

Or perhaps the answer is that there are no such functions except the ones explicitly made available from JavaScript?

Specifically, I would like to know if it is possible to read a clock without the need to write JavaScript that calls Date.getTime() and then call that JavaScript from WebAssembly. My problem with that solution is that I assume doing so would have non-trivial overhead and I would like to read the clock often. Preferably the clock would not be affected by any jump in the local real time clock as I only need to measure the length of time intervals.

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Your guess is correct: there are no specific Wasm functions in a browser. Any JavaScript function with a type that Wasm understands can be directly imported into and called from a Wasm module.

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Thanks, that is a good point. So I can basically just import a function pointer directly to performance.now() and the browser will have a chance to handle that reasonably efficiently.

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