Re: [go-nuts] How could the body for a func be "provided by runtime"?

[Ilya Kostarev]

It's documented. From lang spec
https://golang.org/ref/spec#Function_declarations
"A function declaration may omit the body. Such a declaration
provides the signature for a function implemented outside Go,
such as an assembly routine."

On Thu, 9 Feb 2017 04:15:00 -0800
(PST) Sina Siadat  wrote:

> Hi! In $GOROOT/src/sync/mutex.go:19 there is a function declaration
> like this:
> 
> func throw(string) // provided by runtime
> 
> The function body is missing. I was wondering what is meant by
> "provided by runtime" and how it is done.
> I am guessing this is the same as the throw func defined in 
> src/runtime/panic.go:589. But can't find how the compiler connects
> the two. I thought maybe a body is assigned to this function later
> like this:
> 
> throw = func(s string) { }
> 
> But this fails to compile with "cannot assign to throw" probably
> because throw is not a variable.
> 
> Thanks!
> 

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[go-nuts] How could the body for a func be "provided by runtime"?

[Sina Siadat]

Hi! In $GOROOT/src/sync/mutex.go:19 there is a function declaration like 
this:

func throw(string) // provided by runtime

The function body is missing. I was wondering what is meant by "provided by 
runtime" and how it is done.
I am guessing this is the same as the throw func defined in 
src/runtime/panic.go:589. But can't find how the compiler connects the two. 
I thought maybe a body is assigned to this function later like this:

throw = func(s string) { }

But this fails to compile with "cannot assign to throw" probably because 
throw is not a variable.

Thanks!

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