2413b54888
The first word of an interface is a pointer, but for the purposes of GC we don't need to treat it as such. 1. If it is a non-empty interface, the pointer points to an itab which is always in persistentalloc space. 2. If it is an empty interface, the pointer points to a _type. a. If it is a compile-time-allocated type, it points into the read-only data section. b. If it is a reflect-allocated type, it points into the Go heap. Reflect is responsible for keeping a reference to the underlying type so it won't be GCd. If we ever have a moving GC, we need to change this for 2b (as well as scan itabs to update their itab._type fields). Write barriers on the first word of interfaces have already been removed. Change-Id: I643e91d7ac4de980ac2717436eff94097c65d959 Reviewed-on: https://go-review.googlesource.com/97518 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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