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![Emmanuel Odeke](/assets/img/avatar_default.png)
Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
191 lines
5.1 KiB
Go
191 lines
5.1 KiB
Go
// errorcheck -0 -m -l
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test, using compiler diagnostic flags, that the escape analysis is working.
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// Compiles but does not run. Inlining is disabled.
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// Registerization is disabled too (-N), which should
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// have no effect on escape analysis.
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package main
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import "fmt"
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func main() {
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// Just run test over and over again. This main func is just for
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// convenience; if test were the main func, we could also trigger
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// the panic just by running the program over and over again
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// (sometimes it takes 1 time, sometimes it takes ~4,000+).
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for iter := 0; ; iter++ {
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if iter%50 == 0 {
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fmt.Println(iter) // ERROR "iter escapes to heap$" "main ... argument does not escape$"
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}
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test1(iter)
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test2(iter)
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test3(iter)
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test4(iter)
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test5(iter)
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test6(iter)
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}
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}
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func test1(iter int) {
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const maxI = 500
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m := make(map[int][]int) // ERROR "make\(map\[int\]\[\]int\) escapes to heap$"
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// The panic seems to be triggered when m is modified inside a
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// closure that is both recursively called and reassigned to in a
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// loop.
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// Cause of bug -- escape of closure failed to escape (shared) data structures
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// of map. Assign to fn declared outside of loop triggers escape of closure.
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// Heap -> stack pointer eventually causes badness when stack reallocation
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// occurs.
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var fn func() // ERROR "moved to heap: fn$"
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for i := 0; i < maxI; i++ { // ERROR "moved to heap: i$"
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// var fn func() // this makes it work, because fn stays off heap
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j := 0 // ERROR "moved to heap: j$"
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fn = func() { // ERROR "func literal escapes to heap$"
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m[i] = append(m[i], 0) // ERROR "&i escapes to heap$"
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if j < 25 { // ERROR "&j escapes to heap$"
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j++
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fn() // ERROR "&fn escapes to heap$"
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}
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}
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fn()
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}
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if len(m) != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, len(m) = %d", iter, maxI, len(m))) // ERROR "iter escapes to heap$" "len\(m\) escapes to heap$" "maxI escapes to heap$" "test1 ... argument does not escape$"
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}
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}
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func test2(iter int) {
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const maxI = 500
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m := make(map[int][]int) // ERROR "test2 make\(map\[int\]\[\]int\) does not escape$"
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// var fn func()
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for i := 0; i < maxI; i++ {
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var fn func() // this makes it work, because fn stays off heap
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j := 0
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fn = func() { // ERROR "test2 func literal does not escape$"
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m[i] = append(m[i], 0)
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if j < 25 {
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j++
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fn()
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}
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}
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fn()
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}
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if len(m) != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, len(m) = %d", iter, maxI, len(m))) // ERROR "iter escapes to heap$" "len\(m\) escapes to heap$" "maxI escapes to heap$" "test2 ... argument does not escape$"
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}
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}
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func test3(iter int) {
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const maxI = 500
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var x int // ERROR "moved to heap: x$"
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m := &x // ERROR "&x escapes to heap$"
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var fn func() // ERROR "moved to heap: fn$"
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for i := 0; i < maxI; i++ {
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// var fn func() // this makes it work, because fn stays off heap
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j := 0 // ERROR "moved to heap: j$"
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fn = func() { // ERROR "func literal escapes to heap$"
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if j < 100 { // ERROR "&j escapes to heap$"
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j++
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fn() // ERROR "&fn escapes to heap$"
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} else {
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*m = *m + 1
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}
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}
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fn()
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}
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if *m != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, *m = %d", iter, maxI, *m)) // ERROR "\*m escapes to heap$" "iter escapes to heap$" "maxI escapes to heap$" "test3 ... argument does not escape$"
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}
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}
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func test4(iter int) {
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const maxI = 500
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var x int
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m := &x // ERROR "test4 &x does not escape$"
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// var fn func()
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for i := 0; i < maxI; i++ {
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var fn func() // this makes it work, because fn stays off heap
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j := 0
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fn = func() { // ERROR "test4 func literal does not escape$"
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if j < 100 {
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j++
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fn()
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} else {
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*m = *m + 1
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}
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}
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fn()
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}
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if *m != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, *m = %d", iter, maxI, *m)) // ERROR "\*m escapes to heap$" "iter escapes to heap$" "maxI escapes to heap$" "test4 ... argument does not escape$"
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}
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}
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type str struct {
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m *int
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}
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func recur1(j int, s *str) { // ERROR "recur1 s does not escape"
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if j < 100 {
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j++
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recur1(j, s)
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} else {
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*s.m++
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}
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}
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func test5(iter int) {
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const maxI = 500
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var x int // ERROR "moved to heap: x$"
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m := &x // ERROR "&x escapes to heap$"
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var fn *str
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for i := 0; i < maxI; i++ {
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// var fn *str // this makes it work, because fn stays off heap
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fn = &str{m} // ERROR "&str literal escapes to heap"
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recur1(0, fn)
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}
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if *m != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, *m = %d", iter, maxI, *m)) // ERROR "\*m escapes to heap$" "iter escapes to heap$" "maxI escapes to heap$" "test5 ... argument does not escape$"
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}
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}
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func test6(iter int) {
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const maxI = 500
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var x int
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m := &x // ERROR "&x does not escape$"
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// var fn *str
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for i := 0; i < maxI; i++ {
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var fn *str // this makes it work, because fn stays off heap
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fn = &str{m} // ERROR "&str literal does not escape"
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recur1(0, fn)
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}
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if *m != maxI {
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panic(fmt.Sprintf("iter %d: maxI = %d, *m = %d", iter, maxI, *m)) // ERROR "\*m escapes to heap$" "iter escapes to heap$" "maxI escapes to heap$" "test6 ... argument does not escape$"
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}
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}
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