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18513087
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0
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0
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2013-08-29T14:01:36.143
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2018-03-05T02:03:03.507
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2018-03-05T02:03:03.507
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1643939
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18512781
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2
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There is no <code>make()</code> as such. Simply put, this is happening: <ol> <li>go code: <code>make(chan int)</code></li> <li>symbol substitution: <code>OMAKE</code></li> <li>symbol typechecking: <code>OMAKECHAN</code></li> <li>code generation: <code>runtime·makechan</code></li> </ol> <code>gc</code>, which is a go flavoured C parser, parses the <code>make</code> call according to context (for easier type checking). This conversion is done in <a href="https://github.com/golang/go/blob/go1.10/src/cmd/compile/internal/gc/typecheck.go#L1831" rel="nofollow noreferrer">cmd/compile/internal/gc/typecheck.go</a>. After that, depending on what symbol there is (e.g., <code>OMAKECHAN</code> for <code>make(chan ...)</code>), the appropriate runtime call is substituted in <a href="https://github.com/golang/go/blob/go1.10/src/cmd/compile/internal/gc/walk.go#L1417" rel="nofollow noreferrer">cmd/compile/internal/gc/walk.go</a>. In case of <code>OMAKECHAN</code> this would be <code>makechan64</code> or <code>makechan</code>. Finally, when running the code, said substituted function <a href="https://github.com/golang/go/blob/go1.10/src/runtime/chan.go#L70" rel="nofollow noreferrer">in pkg/runtime</a> is called. <h3>How do you find this</h3> I tend to find such things mostly by imagining in which stage of the process this particular thing may happen. In case of <code>make</code>, with the knowledge that there's no definition of <code>make</code> in <code>pkg/runtime</code> (the most basic package), it has to be on compiler level and is likely to be substituted to something else. You then have to search the various compiler stages (gc, *g, *l) and in time you'll find the definitions.
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