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In general, a conversion to interface type may require values to be boxed, which in turn necessitates escape analysis to determine whether the boxed representation can be stack allocated. However, esc.go used to unconditionally print escape analysis decisions about OCONVIFACE, even for conversions that don't require boxing (e.g., pointers, channels, maps, functions). For test compatibility with esc.go, escape.go similarly printed these useless diagnostics. This CL removes the diagnostics, and updates test expectations accordingly. Change-Id: I97c57a4a08e44d265bba516c78426ff4f2bf1e12 Reviewed-on: https://go-review.googlesource.com/c/go/+/192697 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
442 lines
9.2 KiB
Go
442 lines
9.2 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 escape analysis for function parameters.
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// In this test almost everything is BAD except the simplest cases
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// where input directly flows to output.
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package escape
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func zero() int { return 0 }
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var sink interface{}
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// in -> out
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func param0(p *int) *int { // ERROR "leaking param: p to result ~r1"
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return p
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}
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func caller0a() {
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i := 0
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_ = param0(&i)
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}
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func caller0b() {
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i := 0 // ERROR "moved to heap: i$"
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sink = param0(&i)
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}
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// in, in -> out, out
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func param1(p1, p2 *int) (*int, *int) { // ERROR "leaking param: p1 to result ~r2" "leaking param: p2 to result ~r3"
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return p1, p2
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}
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func caller1() {
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i := 0 // ERROR "moved to heap: i$"
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j := 0
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sink, _ = param1(&i, &j)
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}
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// in -> other in
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func param2(p1 *int, p2 **int) { // ERROR "leaking param: p1$" "param2 p2 does not escape$"
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*p2 = p1
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}
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func caller2a() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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param2(&i, &p)
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_ = p
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}
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func caller2b() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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param2(&i, &p)
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sink = p
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}
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func paramArraySelfAssign(p *PairOfPairs) { // ERROR "p does not escape"
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p.pairs[0] = p.pairs[1] // ERROR "ignoring self-assignment in p.pairs\[0\] = p.pairs\[1\]"
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}
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func paramArraySelfAssignUnsafeIndex(p *PairOfPairs) { // ERROR "leaking param content: p"
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// Function call inside index disables self-assignment case to trigger.
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p.pairs[zero()] = p.pairs[1]
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p.pairs[zero()+1] = p.pairs[1]
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}
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type PairOfPairs struct {
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pairs [2]*Pair
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}
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type BoxedPair struct {
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pair *Pair
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}
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type WrappedPair struct {
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pair Pair
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}
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func leakParam(x interface{}) { // ERROR "leaking param: x"
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sink = x
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}
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func sinkAfterSelfAssignment1(box *BoxedPair) { // ERROR "leaking param content: box"
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box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
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sink = box.pair.p2
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}
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func sinkAfterSelfAssignment2(box *BoxedPair) { // ERROR "leaking param content: box"
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box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
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sink = box.pair
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}
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func sinkAfterSelfAssignment3(box *BoxedPair) { // ERROR "leaking param content: box"
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box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
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leakParam(box.pair.p2)
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}
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func sinkAfterSelfAssignment4(box *BoxedPair) { // ERROR "leaking param content: box"
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box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
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leakParam(box.pair)
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}
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func selfAssignmentAndUnrelated(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape"
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box1.pair.p1 = box1.pair.p2 // ERROR "ignoring self-assignment in box1.pair.p1 = box1.pair.p2"
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leakParam(box2.pair.p2)
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}
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func notSelfAssignment1(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape"
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box1.pair.p1 = box2.pair.p1
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}
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func notSelfAssignment2(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape"
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p1.pairs[0] = p2.pairs[1]
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}
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func notSelfAssignment3(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape"
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p1.pairs[0].p1 = p2.pairs[1].p1
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}
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func boxedPairSelfAssign(box *BoxedPair) { // ERROR "box does not escape"
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box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
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}
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func wrappedPairSelfAssign(w *WrappedPair) { // ERROR "w does not escape"
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w.pair.p1 = w.pair.p2 // ERROR "ignoring self-assignment in w.pair.p1 = w.pair.p2"
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}
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// in -> in
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type Pair struct {
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p1 *int
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p2 *int
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}
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func param3(p *Pair) { // ERROR "param3 p does not escape"
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p.p1 = p.p2 // ERROR "param3 ignoring self-assignment in p.p1 = p.p2"
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}
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func caller3a() {
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i := 0
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j := 0
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p := Pair{&i, &j}
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param3(&p)
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_ = p
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}
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func caller3b() {
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i := 0 // ERROR "moved to heap: i$"
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j := 0 // ERROR "moved to heap: j$"
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p := Pair{&i, &j}
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param3(&p)
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sink = p // ERROR "p escapes to heap$"
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}
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// in -> rcvr
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func (p *Pair) param4(i *int) { // ERROR "\(\*Pair\).param4 p does not escape$" "leaking param: i$"
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p.p1 = i
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}
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func caller4a() {
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i := 0 // ERROR "moved to heap: i$"
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p := Pair{}
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p.param4(&i)
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_ = p
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}
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func caller4b() {
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i := 0 // ERROR "moved to heap: i$"
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p := Pair{}
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p.param4(&i)
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sink = p // ERROR "p escapes to heap$"
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}
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// in -> heap
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func param5(i *int) { // ERROR "leaking param: i$"
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sink = i
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}
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func caller5() {
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i := 0 // ERROR "moved to heap: i$"
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param5(&i)
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}
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// *in -> heap
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func param6(i ***int) { // ERROR "leaking param content: i$"
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sink = *i
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}
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func caller6a() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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p2 := &p
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param6(&p2)
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}
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// **in -> heap
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func param7(i ***int) { // ERROR "leaking param content: i$"
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sink = **i
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}
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func caller7() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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p2 := &p
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param7(&p2)
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}
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// **in -> heap
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func param8(i **int) { // ERROR "param8 i does not escape$"
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sink = **i // ERROR "\* \(\*i\) escapes to heap"
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}
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func caller8() {
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i := 0
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p := &i
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param8(&p)
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}
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// *in -> out
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func param9(p ***int) **int { // ERROR "leaking param: p to result ~r1 level=1"
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return *p
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}
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func caller9a() {
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i := 0
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p := &i
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p2 := &p
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_ = param9(&p2)
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}
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func caller9b() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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p2 := &p
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sink = param9(&p2)
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}
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// **in -> out
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func param10(p ***int) *int { // ERROR "leaking param: p to result ~r1 level=2"
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return **p
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}
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func caller10a() {
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i := 0
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p := &i
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p2 := &p
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_ = param10(&p2)
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}
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func caller10b() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i
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p2 := &p
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sink = param10(&p2)
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}
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// in escapes to heap (address of param taken and returned)
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func param11(i **int) ***int { // ERROR "moved to heap: i$"
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return &i
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}
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func caller11a() {
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i := 0 // ERROR "moved to heap: i"
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p := &i // ERROR "moved to heap: p"
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_ = param11(&p)
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}
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func caller11b() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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sink = param11(&p)
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}
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func caller11c() { // GOOD
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p"
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sink = *param11(&p)
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}
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func caller11d() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p"
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p2 := &p
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sink = param11(p2)
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}
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// &in -> rcvr
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type Indir struct {
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p ***int
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}
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func (r *Indir) param12(i **int) { // ERROR "\(\*Indir\).param12 r does not escape$" "moved to heap: i$"
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r.p = &i
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}
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func caller12a() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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var r Indir
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r.param12(&p)
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_ = r
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}
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func caller12b() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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r := &Indir{} // ERROR "caller12b &Indir literal does not escape$"
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r.param12(&p)
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_ = r
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}
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func caller12c() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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r := Indir{}
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r.param12(&p)
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sink = r
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}
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func caller12d() {
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i := 0 // ERROR "moved to heap: i$"
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p := &i // ERROR "moved to heap: p$"
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r := Indir{}
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r.param12(&p)
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sink = **r.p
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}
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// in -> value rcvr
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type Val struct {
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p **int
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}
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func (v Val) param13(i *int) { // ERROR "Val.param13 v does not escape$" "leaking param: i$"
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*v.p = i
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}
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func caller13a() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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var v Val
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v.p = &p
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v.param13(&i)
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_ = v
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}
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func caller13b() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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v := Val{&p}
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v.param13(&i)
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_ = v
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}
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func caller13c() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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v := &Val{&p} // ERROR "caller13c &Val literal does not escape$"
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v.param13(&i)
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_ = v
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}
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func caller13d() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int // ERROR "moved to heap: p$"
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var v Val
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v.p = &p
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v.param13(&i)
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sink = v
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}
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func caller13e() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int // ERROR "moved to heap: p$"
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v := Val{&p}
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v.param13(&i)
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sink = v
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}
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func caller13f() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int // ERROR "moved to heap: p$"
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v := &Val{&p} // ERROR "&Val literal escapes to heap$"
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v.param13(&i)
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sink = v
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}
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func caller13g() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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v := Val{&p}
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v.param13(&i)
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sink = *v.p
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}
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func caller13h() {
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i := 0 // ERROR "moved to heap: i$"
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var p *int
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v := &Val{&p} // ERROR "caller13h &Val literal does not escape$"
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v.param13(&i)
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sink = **v.p // ERROR "\* \(\*v\.p\) escapes to heap"
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}
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type Node struct {
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p *Node
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}
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var Sink *Node
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func f(x *Node) { // ERROR "leaking param content: x"
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Sink = &Node{x.p} // ERROR "&Node literal escapes to heap"
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}
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func g(x *Node) *Node { // ERROR "leaking param content: x"
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return &Node{x.p} // ERROR "&Node literal escapes to heap"
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}
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func h(x *Node) { // ERROR "leaking param: x"
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y := &Node{x} // ERROR "h &Node literal does not escape"
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Sink = g(y)
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f(y)
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}
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// interface(in) -> out
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// See also issue 29353.
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// Convert to a non-direct interface, require an allocation and
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// copy x to heap (not to result).
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func param14a(x [4]*int) interface{} { // ERROR "leaking param: x$"
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return x // ERROR "x escapes to heap"
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}
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// Convert to a direct interface, does not need an allocation.
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// So x only leaks to result.
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func param14b(x *int) interface{} { // ERROR "leaking param: x to result ~r1 level=0"
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return x
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}
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