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go/test/escape_param.go
Matthew Dempsky abefcac10a cmd/compile: skip escape analysis diagnostics for OADDR 
For most nodes (e.g., OPTRLIT, OMAKESLICE, OCONVIFACE), escape
analysis prints "escapes to heap" or "does not escape" to indicate
whether that node's allocation can be heap or stack allocated.

These messages are also emitted for OADDR, even though OADDR does not
actually allocate anything itself. Moreover, it's redundant because
escape analysis already prints "moved to heap" diagnostics when an
OADDR node like "&x" causes x to require heap allocation.

Because OADDR nodes don't allocate memory, my escape analysis rewrite
doesn't naturally emit the "escapes to heap" / "does not escape"
diagnostics for them. It's also non-trivial to replicate the exact
semantics esc.go uses for OADDR.

Since there are so many of these messages, I'm disabling them in this
CL by themselves. I modified esc.go to suppress the Warnl calls
without any other behavior changes, and then used a shell script to
automatically remove any ERROR messages mentioned by run.go in
"missing error" or "no match for" lines.

Fixes #16300.
Updates #23109.

Change-Id: I3993e2743c3ff83ccd0893f4e73b366ff8871a57
Reviewed-on: https://go-review.googlesource.com/c/go/+/170319
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
2019-04-02 16:34:03 +00:00

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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 escape analysis for function parameters.
// In this test almost everything is BAD except the simplest cases
// where input directly flows to output.
package escape
func zero() int { return 0 }
var sink interface{}
// in -> out
func param0(p *int) *int { // ERROR "leaking param: p to result ~r1"
return p
}
func caller0a() {
i := 0
_ = param0(&i)
}
func caller0b() {
i := 0 // ERROR "moved to heap: i$"
sink = param0(&i) // ERROR "param0\(&i\) escapes to heap"
}
// in, in -> out, out
func param1(p1, p2 *int) (*int, *int) { // ERROR "leaking param: p1 to result ~r2" "leaking param: p2 to result ~r3"
return p1, p2
}
func caller1() {
i := 0 // ERROR "moved to heap: i$"
j := 0
sink, _ = param1(&i, &j)
}
// in -> other in
func param2(p1 *int, p2 **int) { // ERROR "leaking param: p1$" "param2 p2 does not escape$"
*p2 = p1
}
func caller2a() {
i := 0 // ERROR "moved to heap: i$"
var p *int
param2(&i, &p)
_ = p
}
func caller2b() {
i := 0 // ERROR "moved to heap: i$"
var p *int
param2(&i, &p)
sink = p // ERROR "p escapes to heap$"
}
func paramArraySelfAssign(p *PairOfPairs) { // ERROR "p does not escape"
p.pairs[0] = p.pairs[1] // ERROR "ignoring self-assignment in p.pairs\[0\] = p.pairs\[1\]"
}
func paramArraySelfAssignUnsafeIndex(p *PairOfPairs) { // ERROR "leaking param content: p"
// Function call inside index disables self-assignment case to trigger.
p.pairs[zero()] = p.pairs[1]
p.pairs[zero()+1] = p.pairs[1]
}
type PairOfPairs struct {
pairs [2]*Pair
}
type BoxedPair struct {
pair *Pair
}
type WrappedPair struct {
pair Pair
}
func leakParam(x interface{}) { // ERROR "leaking param: x"
sink = x
}
func sinkAfterSelfAssignment1(box *BoxedPair) { // ERROR "leaking param content: box"
box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
sink = box.pair.p2 // ERROR "box.pair.p2 escapes to heap"
}
func sinkAfterSelfAssignment2(box *BoxedPair) { // ERROR "leaking param content: box"
box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
sink = box.pair // ERROR "box.pair escapes to heap"
}
func sinkAfterSelfAssignment3(box *BoxedPair) { // ERROR "leaking param content: box"
box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
leakParam(box.pair.p2) // ERROR "box.pair.p2 escapes to heap"
}
func sinkAfterSelfAssignment4(box *BoxedPair) { // ERROR "leaking param content: box"
box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
leakParam(box.pair) // ERROR "box.pair escapes to heap"
}
func selfAssignmentAndUnrelated(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape"
box1.pair.p1 = box1.pair.p2 // ERROR "ignoring self-assignment in box1.pair.p1 = box1.pair.p2"
leakParam(box2.pair.p2) // ERROR "box2.pair.p2 escapes to heap"
}
func notSelfAssignment1(box1, box2 *BoxedPair) { // ERROR "leaking param content: box2" "box1 does not escape"
box1.pair.p1 = box2.pair.p1
}
func notSelfAssignment2(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape"
p1.pairs[0] = p2.pairs[1]
}
func notSelfAssignment3(p1, p2 *PairOfPairs) { // ERROR "leaking param content: p2" "p1 does not escape"
p1.pairs[0].p1 = p2.pairs[1].p1
}
func boxedPairSelfAssign(box *BoxedPair) { // ERROR "box does not escape"
box.pair.p1 = box.pair.p2 // ERROR "ignoring self-assignment in box.pair.p1 = box.pair.p2"
}
func wrappedPairSelfAssign(w *WrappedPair) { // ERROR "w does not escape"
w.pair.p1 = w.pair.p2 // ERROR "ignoring self-assignment in w.pair.p1 = w.pair.p2"
}
// in -> in
type Pair struct {
p1 *int
p2 *int
}
func param3(p *Pair) { // ERROR "param3 p does not escape"
p.p1 = p.p2 // ERROR "param3 ignoring self-assignment in p.p1 = p.p2"
}
func caller3a() {
i := 0
j := 0
p := Pair{&i, &j}
param3(&p)
_ = p
}
func caller3b() {
i := 0 // ERROR "moved to heap: i$"
j := 0 // ERROR "moved to heap: j$"
p := Pair{&i, &j}
param3(&p)
sink = p // ERROR "p escapes to heap$"
}
// in -> rcvr
func (p *Pair) param4(i *int) { // ERROR "\(\*Pair\).param4 p does not escape$" "leaking param: i$"
p.p1 = i
}
func caller4a() {
i := 0 // ERROR "moved to heap: i$"
p := Pair{}
p.param4(&i)
_ = p
}
func caller4b() {
i := 0 // ERROR "moved to heap: i$"
p := Pair{}
p.param4(&i)
sink = p // ERROR "p escapes to heap$"
}
// in -> heap
func param5(i *int) { // ERROR "leaking param: i$"
sink = i // ERROR "i escapes to heap$"
}
func caller5() {
i := 0 // ERROR "moved to heap: i$"
param5(&i)
}
// *in -> heap
func param6(i ***int) { // ERROR "leaking param content: i$"
sink = *i // ERROR "\*i escapes to heap$"
}
func caller6a() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
p2 := &p
param6(&p2)
}
// **in -> heap
func param7(i ***int) { // ERROR "leaking param content: i$"
sink = **i // ERROR "\* \(\*i\) escapes to heap"
}
func caller7() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
p2 := &p
param7(&p2)
}
// **in -> heap
func param8(i **int) { // ERROR "param8 i does not escape$"
sink = **i // ERROR "\* \(\*i\) escapes to heap"
}
func caller8() {
i := 0
p := &i
param8(&p)
}
// *in -> out
func param9(p ***int) **int { // ERROR "leaking param: p to result ~r1 level=1"
return *p
}
func caller9a() {
i := 0
p := &i
p2 := &p
_ = param9(&p2)
}
func caller9b() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
p2 := &p
sink = param9(&p2) // ERROR "param9\(&p2\) escapes to heap"
}
// **in -> out
func param10(p ***int) *int { // ERROR "leaking param: p to result ~r1 level=2"
return **p
}
func caller10a() {
i := 0
p := &i
p2 := &p
_ = param10(&p2)
}
func caller10b() {
i := 0 // ERROR "moved to heap: i$"
p := &i
p2 := &p
sink = param10(&p2) // ERROR "param10\(&p2\) escapes to heap"
}
// in escapes to heap (address of param taken and returned)
func param11(i **int) ***int { // ERROR "moved to heap: i$"
return &i
}
func caller11a() {
i := 0 // ERROR "moved to heap: i"
p := &i // ERROR "moved to heap: p"
_ = param11(&p)
}
func caller11b() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
sink = param11(&p) // ERROR "param11\(&p\) escapes to heap"
}
func caller11c() { // GOOD
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p"
sink = *param11(&p) // ERROR "\*param11\(&p\) escapes to heap"
}
func caller11d() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p"
p2 := &p
sink = param11(p2) // ERROR "param11\(p2\) escapes to heap"
}
// &in -> rcvr
type Indir struct {
p ***int
}
func (r *Indir) param12(i **int) { // ERROR "\(\*Indir\).param12 r does not escape$" "moved to heap: i$"
r.p = &i
}
func caller12a() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
var r Indir
r.param12(&p)
_ = r
}
func caller12b() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
r := &Indir{} // ERROR "caller12b &Indir literal does not escape$"
r.param12(&p)
_ = r
}
func caller12c() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
r := Indir{}
r.param12(&p)
sink = r // ERROR "r escapes to heap$"
}
func caller12d() {
i := 0 // ERROR "moved to heap: i$"
p := &i // ERROR "moved to heap: p$"
r := Indir{}
r.param12(&p)
sink = **r.p // ERROR "\* \(\*r\.p\) escapes to heap"
}
// in -> value rcvr
type Val struct {
p **int
}
func (v Val) param13(i *int) { // ERROR "Val.param13 v does not escape$" "leaking param: i$"
*v.p = i
}
func caller13a() {
i := 0 // ERROR "moved to heap: i$"
var p *int
var v Val
v.p = &p
v.param13(&i)
_ = v
}
func caller13b() {
i := 0 // ERROR "moved to heap: i$"
var p *int
v := Val{&p}
v.param13(&i)
_ = v
}
func caller13c() {
i := 0 // ERROR "moved to heap: i$"
var p *int
v := &Val{&p} // ERROR "caller13c &Val literal does not escape$"
v.param13(&i)
_ = v
}
func caller13d() {
i := 0 // ERROR "moved to heap: i$"
var p *int // ERROR "moved to heap: p$"
var v Val
v.p = &p
v.param13(&i)
sink = v // ERROR "v escapes to heap$"
}
func caller13e() {
i := 0 // ERROR "moved to heap: i$"
var p *int // ERROR "moved to heap: p$"
v := Val{&p}
v.param13(&i)
sink = v // ERROR "v escapes to heap$"
}
func caller13f() {
i := 0 // ERROR "moved to heap: i$"
var p *int // ERROR "moved to heap: p$"
v := &Val{&p} // ERROR "&Val literal escapes to heap$"
v.param13(&i)
sink = v // ERROR "v escapes to heap$"
}
func caller13g() {
i := 0 // ERROR "moved to heap: i$"
var p *int
v := Val{&p}
v.param13(&i)
sink = *v.p // ERROR "\*v\.p escapes to heap"
}
func caller13h() {
i := 0 // ERROR "moved to heap: i$"
var p *int
v := &Val{&p} // ERROR "caller13h &Val literal does not escape$"
v.param13(&i)
sink = **v.p // ERROR "\* \(\*v\.p\) escapes to heap"
}
type Node struct {
p *Node
}
var Sink *Node
func f(x *Node) { // ERROR "leaking param content: x"
Sink = &Node{x.p} // ERROR "&Node literal escapes to heap"
}
func g(x *Node) *Node { // ERROR "leaking param: x to result ~r1 level=0"
return &Node{x.p} // ERROR "&Node literal escapes to heap"
}
func h(x *Node) { // ERROR "leaking param: x"
y := &Node{x} // ERROR "h &Node literal does not escape"
Sink = g(y)
f(y)
}
// interface(in) -> out
// See also issue 29353.
// Convert to a non-direct interface, require an allocation and
// copy x to heap (not to result).
func param14a(x [4]*int) interface{} { // ERROR "leaking param: x$"
return x // ERROR "x escapes to heap"
}
// Convert to a direct interface, does not need an allocation.
// So x only leaks to result.
func param14b(x *int) interface{} { // ERROR "leaking param: x to result ~r1 level=0"
return x // ERROR "x escapes to heap"
}
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