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test: add tests for indirection level computation in escape analysis

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The false positive (var incorrectly escapes to heap) is marked with BAD.

Change-Id: I11877fa8e976094b31a221abd88ae32d351c85ee
Reviewed-on: https://go-review.googlesource.com/5292
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Dmitry Vyukov 2015-02-19 15:44:08 +03:00
parent 130538bb9a
commit 6d9fd7e65b
1 changed files with 108 additions and 0 deletions
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108
test/escape_level.go Normal file
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// 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 indirection level computation in escape analysis.
package escape
var sink interface{}
func level0() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
p1 := &p0 // ERROR "moved to heap: p1" "&p0 escapes to heap"
p2 := &p1 // ERROR "moved to heap: p2" "&p1 escapes to heap"
sink = &p2 // ERROR "&p2 escapes to heap"
}
func level1() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
p1 := &p0 // ERROR "moved to heap: p1" "&p0 escapes to heap"
p2 := &p1 // ERROR "&p1 escapes to heap"
sink = p2
}
func level2() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
p1 := &p0 // ERROR "&p0 escapes to heap"
p2 := &p1 // ERROR "&p1 does not escape"
sink = *p2
}
func level3() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "&i escapes to heap"
p1 := &p0 // ERROR "&p0 does not escape"
p2 := &p1 // ERROR "&p1 does not escape"
sink = **p2
}
func level4() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
p1 := &p0 // ERROR "&p0 escapes to heap"
p2 := p1 // ERROR "moved to heap: p2"
sink = &p2 // ERROR "&p2 escapes to heap"
}
func level5() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
p1 := &p0 // ERROR "&p0 escapes to heap"
p2 := p1
sink = p2
}
func level6() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "&i escapes to heap"
p1 := &p0 // ERROR "&p0 does not escape"
p2 := p1
sink = *p2
}
func level7() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "moved to heap: p0" "&i escapes to heap"
// BAD: p0 should not escape here
p1 := &p0 // ERROR "&p0 escapes to heap"
p2 := *p1 // ERROR "moved to heap: p2"
sink = &p2 // ERROR "&p2 escapes to heap"
}
func level8() {
i := 0 // ERROR "moved to heap: i"
p0 := &i // ERROR "&i escapes to heap"
p1 := &p0 // ERROR "&p0 does not escape"
p2 := *p1
sink = p2
}
func level9() {
i := 0
p0 := &i // ERROR "&i does not escape"
p1 := &p0 // ERROR "&p0 does not escape"
p2 := *p1
sink = *p2
}
func level10() {
i := 0
p0 := &i // ERROR "&i does not escape"
p1 := *p0
p2 := &p1 // ERROR "&p1 does not escape"
sink = *p2
}
func level11() {
i := 0
p0 := &i // ERROR "&i does not escape"
p1 := &p0 // ERROR "&p0 does not escape"
p2 := **p1 // ERROR "moved to heap: p2"
sink = &p2 // ERROR "&p2 escapes to heap"
}