mirror of
https://github.com/golang/go
synced 2024-11-24 17:40:14 -07:00
b19ec6842d
Indirect function and method calls should leak everything,
but they didn't.
This fix had no particular effect on the cost of running the
compiler on html/template/*.go and added a single new "escape"
to the standard library:
syscall/syscall_unix.go:85: &b[0] escapes to heap
in
if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])),
uintptr(len(b))); errno != nil {
Added specific escape testing to escape_calls.go
(and verified that it fails without this patch)
I also did a little code cleanup around the changes in esc.c.
Fixes #10925
Change-Id: I9984b701621ad4c49caed35b01e359295c210033
Reviewed-on: https://go-review.googlesource.com/10295
Reviewed-by: Russ Cox <rsc@golang.org>
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// errorcheck -0 -m -l
|
|
|
|
// Copyright 2015 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.
|
|
|
|
// Test escape analysis for function parameters.
|
|
|
|
// In this test almost everything is BAD except the simplest cases
|
|
// where input directly flows to output.
|
|
|
|
package foo
|
|
|
|
func f(buf []byte) []byte { // ERROR "leaking param: buf to result ~r1 level=0$"
|
|
return buf
|
|
}
|
|
|
|
func g(*byte) string
|
|
|
|
func h(e int) {
|
|
var x [32]byte // ERROR "moved to heap: x$"
|
|
g(&f(x[:])[0]) // ERROR "&f\(x\[:\]\)\[0\] escapes to heap$" "x escapes to heap$"
|
|
}
|
|
|
|
type Node struct {
|
|
s string
|
|
left, right *Node
|
|
}
|
|
|
|
func walk(np **Node) int { // ERROR "leaking param content: np"
|
|
n := *np
|
|
w := len(n.s)
|
|
if n == nil {
|
|
return 0
|
|
}
|
|
wl := walk(&n.left) // ERROR "walk &n.left does not escape"
|
|
wr := walk(&n.right) // ERROR "walk &n.right does not escape"
|
|
if wl < wr {
|
|
n.left, n.right = n.right, n.left
|
|
wl, wr = wr, wl
|
|
}
|
|
*np = n
|
|
return w + wl + wr
|
|
}
|
|
|
|
// Test for bug where func var f used prototype's escape analysis results.
|
|
func prototype(xyz []string) {} // ERROR "prototype xyz does not escape"
|
|
func bar() {
|
|
var got [][]string
|
|
f := prototype
|
|
f = func(ss []string) { got = append(got, ss) } // ERROR "leaking param: ss" "func literal does not escape"
|
|
s := "string"
|
|
f([]string{s}) // ERROR "\[\]string literal escapes to heap"
|
|
}
|