• Keith Randall's avatar
    cmd/compile: generate frame pointers for otherwise frameless functions · c96e94e6
    Keith Randall authored
    func f() {
        g()
    }
    
    We mistakenly don't add a frame pointer for f.  This means f
    isn't seen when walking the frame pointer linked list.  That
    matters for kernel-gathered profiles, and is an impediment for
    issues like #16638.
    
    To fix, allocate a stack frame even for otherwise frameless functions
    like f.  It is a bit tricky because we need to avoid some runtime
    internals that really, really don't want one.
    
    No test at the moment, as only kernel CPU profiles would catch it.
    Tests will come with the implementation of #16638.
    
    Fixes #18103
    
    Change-Id: I411206cc9de4c8fdd265bee2e4fa61d161ad1847
    Reviewed-on: https://go-review.googlesource.com/33754
    Run-TryBot: Keith Randall <khr@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarAustin Clements <austin@google.com>
    c96e94e6
subr.go 48.7 KB