mirror of
https://github.com/golang/go
synced 2024-11-23 18:20:04 -07:00
9c066bab64
This is an extension of https://go-review.googlesource.com/c/31662/ to mark all the temporaries, not just the ssa-generated ones. Before-and-after ls -l `go tool -n compile` shows a 3% reduction in size (or rather, a prior 3% inflation for failing to filter temps out properly.) Replaced name-dependent "is it a temp?" tests with calls to *Node.IsAutoTmp(), which depends on AutoTemp. Also replace calls to istemp(n) with n.IsAutoTmp(), to reduce duplication and clean up function name space. Generated temporaries now come with a "." prefix to avoid (apparently harmless) clashes with legal Go variable names. Fixes #17644. Fixes #17240. Change-Id: If1417f29c79a7275d7303ddf859b51472890fd43 Reviewed-on: https://go-review.googlesource.com/32255 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
// errorcheck -0 -live
|
|
|
|
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Issue 15747: liveness analysis was marking heap-escaped params live too much,
|
|
// and worse was using the wrong bitmap bits to do so.
|
|
|
|
package p
|
|
|
|
var global *[]byte
|
|
|
|
type Q struct{}
|
|
|
|
type T struct{ M string }
|
|
|
|
var b bool
|
|
|
|
func f1(q *Q, xx []byte) interface{} { // ERROR "live at call to newobject: xx$" "live at call to writebarrierptr: &xx$" "live at entry to f1: xx$"
|
|
// xx was copied from the stack to the heap on the previous line:
|
|
// xx was live for the first two prints but then it switched to &xx
|
|
// being live. We should not see plain xx again.
|
|
if b {
|
|
global = &xx // ERROR "live at call to writebarrierptr: &xx$"
|
|
}
|
|
xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$" "live at call to writebarrierptr: err.data err.type$"
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
//go:noinline
|
|
func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$"
|
|
if n > len(d) {
|
|
return d, nil, &T{M: "hello"} // ERROR "live at call to newobject: d" "live at call to writebarrierptr: d"
|
|
}
|
|
res = d[:n]
|
|
odata = d[n:]
|
|
return
|
|
}
|