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runtime: update outdated comments for deferprocStack

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Change-Id: I0ea4d15da163cec6fe2a703376ce5a6032e15484
Reviewed-on: https://go-review.googlesource.com/c/go/+/714861
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
This commit is contained in:
Youlin Feng 2025-10-25 11:49:30 +08:00 • committed by Gopher Robot
parent e12d8a90bf
commit eaf28a27fd
1 changed files with 2 additions and 4 deletions
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6
src/runtime/panic.go
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@ -545,15 +545,13 @@ func deferprocStack(d *_defer) {
d.rangefunc = false d.rangefunc = false
d.sp = sys.GetCallerSP() d.sp = sys.GetCallerSP()
// The lines below implement: // The lines below implement:
// d.panic = nil
// d.fd = nil
// d.link = gp._defer // d.link = gp._defer
// d.head = nil // d.head = nil
// gp._defer = d // gp._defer = d
// But without write barriers. The first three are writes to // But without write barriers. The first two are writes to
// the stack so they don't need a write barrier, and furthermore // the stack so they don't need a write barrier, and furthermore
// are to uninitialized memory, so they must not use a write barrier. // are to uninitialized memory, so they must not use a write barrier.
// The fourth write does not require a write barrier because we // The third write does not require a write barrier because we
// explicitly mark all the defer structures, so we don't need to // explicitly mark all the defer structures, so we don't need to
// keep track of pointers to them with a write barrier. // keep track of pointers to them with a write barrier.
*(*uintptr)(unsafe.Pointer(&d.link)) = uintptr(unsafe.Pointer(gp._defer)) *(*uintptr)(unsafe.Pointer(&d.link)) = uintptr(unsafe.Pointer(gp._defer))