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all: document legacy //go:linkname for modules with ≥50,000 dependents

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Note that this depends on the revert of CL 581395 to move zeroVal back.

For #67401.

Change-Id: I507c27c2404ad1348aabf1ffa3740e6b1957495b
Reviewed-on: https://go-review.googlesource.com/c/go/+/587217
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Russ Cox 2024-05-21 23:02:51 -04:00 • committed by Gopher Robot
parent 4c589d93ad
commit 5fee159bc2
18 changed files with 277 additions and 42 deletions
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10
src/runtime/slice.go
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@ -152,6 +152,16 @@ func makeslice64(et *_type, len64, cap64 int64) unsafe.Pointer {
// new length so that the old length is not live (does not need to be
// spilled/restored) and the new length is returned (also does not need
// to be spilled/restored).
//
// growslice should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
// - github.com/ugorji/go/codec
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname growslice
func growslice(oldPtr unsafe.Pointer, newLen, oldCap, num int, et *_type) slice {
oldLen := newLen - num
if raceenabled {