mirror of
https://github.com/golang/go
synced 2024-11-24 05:50:13 -07:00
2c95e3a6a8
This CL changes "T literal.M" error message to "T{...}.M". It's clearer
expression and focusing user on actual issue.
Updates #38745
Change-Id: I84b455a86742f37e0bde5bf390aa02984eecc3c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/253677
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
299 lines
8.9 KiB
Go
299 lines
8.9 KiB
Go
// 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 *struct function parameters.
|
|
// Note companion strict_param2 checks struct function parameters with similar tests.
|
|
|
|
package notmain
|
|
|
|
var Ssink *string
|
|
|
|
type U struct {
|
|
_sp *string
|
|
_spp **string
|
|
}
|
|
|
|
type V struct {
|
|
_u U
|
|
_up *U
|
|
_upp **U
|
|
}
|
|
|
|
func (u *U) SP() *string { // ERROR "leaking param: u to result ~r0 level=1$"
|
|
return u._sp
|
|
}
|
|
|
|
func (u *U) SPP() **string { // ERROR "leaking param: u to result ~r0 level=1$"
|
|
return u._spp
|
|
}
|
|
|
|
func (u *U) SPPi() *string { // ERROR "leaking param: u to result ~r0 level=2$"
|
|
return *u._spp
|
|
}
|
|
|
|
func tSPPi() {
|
|
s := "cat" // ERROR "moved to heap: s$"
|
|
ps := &s
|
|
pps := &ps
|
|
pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
|
|
Ssink = pu.SPPi()
|
|
}
|
|
|
|
func tiSPP() {
|
|
s := "cat" // ERROR "moved to heap: s$"
|
|
ps := &s
|
|
pps := &ps
|
|
pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
|
|
Ssink = *pu.SPP()
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of ps
|
|
func tSP() {
|
|
s := "cat" // ERROR "moved to heap: s$"
|
|
ps := &s // ERROR "moved to heap: ps$"
|
|
pps := &ps
|
|
pu := &U{ps, pps} // ERROR "&U{...} does not escape$"
|
|
Ssink = pu.SP()
|
|
}
|
|
|
|
func (v *V) u() U { // ERROR "leaking param: v to result ~r0 level=1$"
|
|
return v._u
|
|
}
|
|
|
|
func (v *V) UP() *U { // ERROR "leaking param: v to result ~r0 level=1$"
|
|
return v._up
|
|
}
|
|
|
|
func (v *V) UPP() **U { // ERROR "leaking param: v to result ~r0 level=1$"
|
|
return v._upp
|
|
}
|
|
|
|
func (v *V) UPPia() *U { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return *v._upp
|
|
}
|
|
|
|
func (v *V) UPPib() *U { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return *v.UPP()
|
|
}
|
|
|
|
func (v *V) USPa() *string { // ERROR "leaking param: v to result ~r0 level=1$"
|
|
return v._u._sp
|
|
}
|
|
|
|
func (v *V) USPb() *string { // ERROR "leaking param: v to result ~r0 level=1$"
|
|
return v.u()._sp
|
|
}
|
|
|
|
func (v *V) USPPia() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return *v._u._spp
|
|
}
|
|
|
|
func (v *V) USPPib() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v._u.SPPi()
|
|
}
|
|
|
|
func (v *V) UPiSPa() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v._up._sp
|
|
}
|
|
|
|
func (v *V) UPiSPb() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v._up.SP()
|
|
}
|
|
|
|
func (v *V) UPiSPc() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v.UP()._sp
|
|
}
|
|
|
|
func (v *V) UPiSPd() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v.UP().SP()
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
|
|
func tUPiSPa() {
|
|
s1 := "ant"
|
|
s2 := "bat" // ERROR "moved to heap: s2$"
|
|
s3 := "cat" // ERROR "moved to heap: s3$"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4 // ERROR "moved to heap: ps4$"
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPa() // Ssink = &s3 (only &s3 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
|
|
func tUPiSPb() {
|
|
s1 := "ant"
|
|
s2 := "bat" // ERROR "moved to heap: s2$"
|
|
s3 := "cat" // ERROR "moved to heap: s3$"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4 // ERROR "moved to heap: ps4$"
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPb() // Ssink = &s3 (only &s3 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
|
|
func tUPiSPc() {
|
|
s1 := "ant"
|
|
s2 := "bat" // ERROR "moved to heap: s2$"
|
|
s3 := "cat" // ERROR "moved to heap: s3$"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4 // ERROR "moved to heap: ps4$"
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPc() // Ssink = &s3 (only &s3 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
|
|
func tUPiSPd() {
|
|
s1 := "ant"
|
|
s2 := "bat" // ERROR "moved to heap: s2$"
|
|
s3 := "cat" // ERROR "moved to heap: s3$"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4 // ERROR "moved to heap: ps4$"
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} escapes to heap$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPd() // Ssink = &s3 (only &s3 really escapes)
|
|
}
|
|
|
|
func (v V) UPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return *v._up._spp
|
|
}
|
|
|
|
func (v V) UPiSPPib() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v._up.SPPi()
|
|
}
|
|
|
|
func (v V) UPiSPPic() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return *v.UP()._spp
|
|
}
|
|
|
|
func (v V) UPiSPPid() *string { // ERROR "leaking param: v to result ~r0 level=2$"
|
|
return v.UP().SPPi()
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
|
|
func tUPiSPPia() {
|
|
s1 := "ant"
|
|
s2 := "bat"
|
|
s3 := "cat"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPPia() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
|
|
func tUPiSPPib() {
|
|
s1 := "ant"
|
|
s2 := "bat"
|
|
s3 := "cat"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPPib() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
|
|
func tUPiSPPic() {
|
|
s1 := "ant"
|
|
s2 := "bat"
|
|
s3 := "cat"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPPic() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
|
|
}
|
|
|
|
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s4
|
|
func tUPiSPPid() {
|
|
s1 := "ant"
|
|
s2 := "bat"
|
|
s3 := "cat"
|
|
s4 := "dog" // ERROR "moved to heap: s4$"
|
|
s5 := "emu" // ERROR "moved to heap: s5$"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4
|
|
ps6 := &s6 // ERROR "moved to heap: ps6$"
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPiSPPid() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
|
|
}
|
|
|
|
func (v *V) UPPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=4$"
|
|
return *(*v._upp)._spp
|
|
}
|
|
|
|
// This test isolates the one value that needs to escape, not because
|
|
// it distinguishes fields but because it knows that &s6 is the only
|
|
// value reachable by two indirects from v.
|
|
// The test depends on the level cap in the escape analysis tags
|
|
// being able to encode that fact.
|
|
func tUPPiSPPia() {
|
|
s1 := "ant"
|
|
s2 := "bat"
|
|
s3 := "cat"
|
|
s4 := "dog"
|
|
s5 := "emu"
|
|
s6 := "fox" // ERROR "moved to heap: s6$"
|
|
ps2 := &s2
|
|
ps4 := &s4
|
|
ps6 := &s6
|
|
u1 := U{&s1, &ps2}
|
|
u2 := &U{&s3, &ps4} // ERROR "&U{...} does not escape$"
|
|
u3 := &U{&s5, &ps6} // ERROR "&U{...} does not escape$"
|
|
v := &V{u1, u2, &u3} // ERROR "&V{...} does not escape$"
|
|
Ssink = v.UPPiSPPia() // Ssink = *&ps6 = &s6 (only &s6 really escapes)
|
|
}
|