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doc: add description of new framepointer vet check

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Update #43014

Change-Id: I5fbfaa16e6acb8859fd0b1188f532f5a225f6349
Reviewed-on: https://go-review.googlesource.com/c/go/+/276373
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Keith Randall 2020-12-08 14:35:41 -08:00
parent 31496cfde5
commit ae9b442df2
1 changed files with 12 additions and 0 deletions
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doc/go1.16.html
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@ -293,6 +293,18 @@ Do not send CLs removing the interior tags from such phrases.
<!-- CL 235677: https://golang.org/cl/235677: cmd/vet: bring in pass to catch invalid uses of testing.T in goroutines -->
</p>
<p><!-- CL 248686, CL 276372 -->
The vet tool now warns about amd64 assembly that clobbers the BP
register (the frame pointer) without saving and restoring it,
contrary to the calling convention. Code that doesn't preserve the
BP register must be modified to either not use BP at all or preserve
BP by saving and restoring it. An easy way to preserve BP is to set
the frame size to a nonzero value, which causes the generated
prologue and epilogue to preserve the BP register for you.
See <a href="https://golang.org/cl/248260">CL 248260</a> for example
fixes.
</p>
<h2 id="runtime">Runtime</h2>
<p>