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https://github.com/golang/go
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507fcf37d2
includes step 0: synthesize outparams, from 6600044
includes step 1,2: give outparams loopdepth 0 and verify unchanged results
generate esc:$mask tags, but still tie to sink if a param has mask != 0
from 6610054
adds final steps:
- have esccall generate n->escretval, a list of nodes the function results flow to
- use these in esccall and ORETURN/OAS2FUNC/and f(g())
- only tie parameters to sink if tag is absent, otherwise according to mask, tie them to escretval
R=rsc, bradfitz
CC=dave, gobot, golang-dev, iant, rsc
https://golang.org/cl/6741044
120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
// errorcheck -0 -m -l
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// Copyright 2012 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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package foo
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func noleak(p *int) int { // ERROR "p does not escape"
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return *p
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}
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func leaktoret(p *int) *int { // ERROR "leaking param: p to result"
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return p
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}
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func leaktoret2(p *int) (*int, *int) { // ERROR "leaking param: p to result .anon1" "leaking param: p to result .anon2"
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return p, p
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}
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func leaktoret22(p, q *int) (*int, *int) { // ERROR "leaking param: p to result .anon2" "leaking param: q to result .anon3"
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return p, q
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}
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func leaktoret22b(p, q *int) (*int, *int) { // ERROR "leaking param: p to result .anon3" "leaking param: q to result .anon2"
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return leaktoret22(q, p)
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}
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func leaktoret22c(p, q *int) (*int, *int) { // ERROR "leaking param: p to result .anon3" "leaking param: q to result .anon2"
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r, s := leaktoret22(q, p)
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return r, s
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}
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func leaktoret22d(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
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r, s = leaktoret22(q, p)
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return
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}
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func leaktoret22e(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
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r, s = leaktoret22(q, p)
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return r, s
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}
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func leaktoret22f(p, q *int) (r, s *int) { // ERROR "leaking param: p to result s" "leaking param: q to result r"
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rr, ss := leaktoret22(q, p)
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return rr, ss
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}
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var gp *int
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func leaktosink(p *int) *int { // ERROR "leaking param: p"
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gp = p
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return p
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}
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func f1() {
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var x int
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p := noleak(&x) // ERROR "&x does not escape"
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_ = p
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}
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func f2() {
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var x int
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p := leaktoret(&x) // ERROR "&x does not escape"
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_ = p
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}
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func f3() {
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var x int // ERROR "moved to heap: x"
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p := leaktoret(&x) // ERROR "&x escapes to heap"
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gp = p
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}
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func f4() {
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var x int // ERROR "moved to heap: x"
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p, q := leaktoret2(&x) // ERROR "&x escapes to heap"
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gp = p
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gp = q
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}
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func f5() {
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var x int
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leaktoret22(leaktoret2(&x)) // ERROR "&x does not escape"
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}
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func f6() {
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var x int // ERROR "moved to heap: x"
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px1, px2 := leaktoret22(leaktoret2(&x)) // ERROR "&x escapes to heap"
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gp = px1
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_ = px2
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}
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type T struct{ x int }
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func (t *T) Foo(u int) (*T, bool) { // ERROR "leaking param: t to result"
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t.x += u
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return t, true
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}
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func f7() *T {
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r, _ := new(T).Foo(42) // ERROR "new.T. escapes to heap"
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return r
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}
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func leakrecursive1(p, q *int) (*int, *int) { // ERROR "leaking param: p" "leaking param: q"
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return leakrecursive2(q, p)
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}
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func leakrecursive2(p, q *int) (*int, *int) { // ERROR "leaking param: p" "leaking param: q"
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if *p > *q {
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return leakrecursive1(q, p)
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}
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// without this, leakrecursive? are safe for p and q, b/c in fact their graph does not have leaking edges.
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return p, q
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}
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