On Tuesday, June 23, 2020 at 7:32:56 PM UTC-5, Bill Morgan wrote:
>
> I'm a C programmer so maybe this is a dumb question but, why does this
> code in runtime/gostring.go allocate (rawstring) then copy data (memmove)
> instead of just making the stringStruct.str point at the incoming data?
> i.e. copy the pointer instead of allocating+copying data.
>
>
> func gostring(p *byte) string {
> l := findnull(p)
> if l == 0 {
> return ""
> }
> s, b := rawstring(l)
> memmove(unsafe.Pointer(&b[0]), unsafe.Pointer(p), uintptr(l))
> return s
> }
>
looks like the code came from
commit: 61dca94e107170d2ff3beb13bb9fa5ce49d8d6fd and the old string.c file
had a gostringnocopy that copied the ptr instead of allocating and copying.
Wondering why that was removed. I guess there must be some reason that you
must have a duplicate copy.
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