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runtime: reimplement GODEBUG=cgocheck=2 as a GOEXPERIMENT

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Move this knob from a binary-startup thing to a build-time thing.
This will enable followon optmizations to the write barrier.

Change-Id: Ic3323348621c76a7dc390c09ff55016b19c43018
Reviewed-on: https://go-review.googlesource.com/c/go/+/447778
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Keith Randall 2022-10-20 14:20:41 -07:00
parent 44d22e75dd
commit 55044288ad
18 changed files with 168 additions and 90 deletions
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11
src/runtime/proc.go
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@ -751,17 +751,6 @@ func schedinit() {
// World is effectively started now, as P's can run.
worldStarted()
// For cgocheck > 1, we turn on the write barrier at all times
// and check all pointer writes. We can't do this until after
// procresize because the write barrier needs a P.
if debug.cgocheck > 1 {
writeBarrier.cgo = true
writeBarrier.enabled = true
for _, pp := range allp {
pp.wbBuf.reset()
}
}
if buildVersion == "" {
// Condition should never trigger. This code just serves
// to ensure runtime·buildVersion is kept in the resulting binary.