function pointers about validator HOT 7 CLOSED

There are several asm.js demos, so clearly function pointers work, but the spec doesn't mention them. So how do they work? :)

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Just like function pointers in emscripten in general - function pointers are indexes into a table of functions. There is a separate table for each function type though, mandated by asm.

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For each function type? Wow, why is that? That might make embind trickier.

Can you point me to where this is in the spec?

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On Mar 25, 2013, at 3:29 PM, Alon Zakai [email protected] wrote:

Just like function pointers in emscripten in general - function pointers are indexes into a table of functions. There is a separate table for each function type though, mandated by asm.

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Hm, I think I understand why it's necessary to segregate function tables now. Indeed, this will make embind tricky, but I'll reach out directly when it's time to bring embind to asm.js.

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On Mar 25, 2013, at 3:44 PM, Chad Austin [email protected] wrote:

For each function type? Wow, why is that? That might make embind trickier.

Can you point me to where this is in the spec?

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On Mar 25, 2013, at 3:29 PM, Alon Zakai [email protected] wrote:

Just like function pointers in emscripten in general - function pointers are indexes into a table of functions. There is a separate table for each function type though, mandated by asm.

—
Reply to this email directly or view it on GitHub.

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This is in the spec now.

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I've just looked at the asm.js spec at http://asmjs.org/spec/latest/#value-types , and there is no provision for function pointers as values. Why was this closed?

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What was added was support for function tables:

http://asmjs.org/spec/latest/#function-table-types

Function tables and indices thereinto can provide function-pointer functionality.

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