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escape_struct_param2.go
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escape_struct_param2.go
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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 struct function parameters.
// Note companion strict_param1 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=0$"
return u._sp
}
func (u U) SPP() **string { // ERROR "leaking param: u to result ~r0 level=0$"
return u._spp
}
func (u U) SPPi() *string { // ERROR "leaking param: u to result ~r0 level=1$"
return *u._spp
}
func tSPPi() {
s := "cat" // ERROR "moved to heap: s$"
ps := &s // ERROR "&s escapes to heap$"
pps := &ps // ERROR "tSPPi &ps does not escape$"
pu := &U{ps, pps} // ERROR "tSPPi &U literal does not escape$"
Ssink = pu.SPPi()
}
func tiSPP() {
s := "cat" // ERROR "moved to heap: s$"
ps := &s // ERROR "&s escapes to heap$"
pps := &ps // ERROR "tiSPP &ps does not escape$"
pu := &U{ps, pps} // ERROR "tiSPP &U literal does not escape$"
Ssink = *pu.SPP()
}
// BAD: need fine-grained analysis to avoid spurious escape of ps
func tSP() {
s := "cat" // ERROR "moved to heap: s$"
ps := &s // ERROR "&s escapes to heap$" "moved to heap: ps$"
pps := &ps // ERROR "&ps escapes to heap$"
pu := &U{ps, pps} // ERROR "tSP &U literal does not escape$"
Ssink = pu.SP()
}
func (v V) u() U { // ERROR "leaking param: v to result ~r0 level=0$"
return v._u
}
func (v V) UP() *U { // ERROR "leaking param: v to result ~r0 level=0$"
return v._up
}
func (v V) UPP() **U { // ERROR "leaking param: v to result ~r0 level=0$"
return v._upp
}
func (v V) UPPia() *U { // ERROR "leaking param: v to result ~r0 level=1$"
return *v._upp
}
func (v V) UPPib() *U { // ERROR "leaking param: v to result ~r0 level=1$"
return *v.UPP()
}
func (v V) USPa() *string { // ERROR "leaking param: v to result ~r0 level=0$"
return v._u._sp
}
func (v V) USPb() *string { // ERROR "leaking param: v to result ~r0 level=0$"
return v.u()._sp
}
func (v V) USPPia() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return *v._u._spp
}
func (v V) USPPib() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return v._u.SPPi()
}
func (v V) UPiSPa() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return v._up._sp
}
func (v V) UPiSPb() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return v._up.SP()
}
func (v V) UPiSPc() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return v.UP()._sp
}
func (v V) UPiSPd() *string { // ERROR "leaking param: v to result ~r0 level=1$"
return v.UP().SP()
}
// BAD: need fine-grained (field-sensitive) analysis to avoid spurious escape of all but &s3
func tUPiSPa() {
s1 := "ant"
s2 := "bat" // ERROR "moved to heap: s2$"
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 // ERROR "&s2 escapes to heap$"
ps4 := &s4 // ERROR "&s4 escapes to heap$" "moved to heap: ps4$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPa &ps2 does not escape$" "tUPiSPa &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "&ps4 escapes to heap$" "&s3 escapes to heap$" "tUPiSPa &U literal does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$" "&ps6 escapes to heap$" "&s5 escapes to heap$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPa &V literal does not escape$" "tUPiSPa &u3 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 // ERROR "&s2 escapes to heap$"
ps4 := &s4 // ERROR "&s4 escapes to heap$" "moved to heap: ps4$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPb &ps2 does not escape$" "tUPiSPb &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "&ps4 escapes to heap$" "&s3 escapes to heap$" "tUPiSPb &U literal does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$" "&ps6 escapes to heap$" "&s5 escapes to heap$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPb &V literal does not escape$" "tUPiSPb &u3 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 // ERROR "&s2 escapes to heap$"
ps4 := &s4 // ERROR "&s4 escapes to heap$" "moved to heap: ps4$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPc &ps2 does not escape$" "tUPiSPc &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "&ps4 escapes to heap$" "&s3 escapes to heap$" "tUPiSPc &U literal does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$" "&ps6 escapes to heap$" "&s5 escapes to heap$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPc &V literal does not escape$" "tUPiSPc &u3 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 // ERROR "&s2 escapes to heap$"
ps4 := &s4 // ERROR "&s4 escapes to heap$" "moved to heap: ps4$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPd &ps2 does not escape$" "tUPiSPd &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "&ps4 escapes to heap$" "&s3 escapes to heap$" "tUPiSPd &U literal does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&U literal escapes to heap$" "&ps6 escapes to heap$" "&s5 escapes to heap$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPd &V literal does not escape$" "tUPiSPd &u3 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 // ERROR "tUPiSPPia &s2 does not escape$"
ps4 := &s4 // ERROR "&s4 escapes to heap$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPPia &ps2 does not escape$" "tUPiSPPia &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "tUPiSPPia &U literal does not escape$" "tUPiSPPia &ps4 does not escape$" "tUPiSPPia &s3 does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&ps6 escapes to heap$" "&s5 escapes to heap$" "tUPiSPPia &U literal does not escape$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPPia &V literal does not escape$" "tUPiSPPia &u3 does not escape$"
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$"
ps2 := &s2 // ERROR "tUPiSPPib &s2 does not escape$"
ps4 := &s4 // ERROR "&s4 escapes to heap$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPPib &ps2 does not escape$" "tUPiSPPib &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "tUPiSPPib &U literal does not escape$" "tUPiSPPib &ps4 does not escape$" "tUPiSPPib &s3 does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&ps6 escapes to heap$" "&s5 escapes to heap$" "tUPiSPPib &U literal does not escape$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPPib &V literal does not escape$" "tUPiSPPib &u3 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 // ERROR "tUPiSPPic &s2 does not escape$"
ps4 := &s4 // ERROR "&s4 escapes to heap$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPPic &ps2 does not escape$" "tUPiSPPic &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "tUPiSPPic &U literal does not escape$" "tUPiSPPic &ps4 does not escape$" "tUPiSPPic &s3 does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&ps6 escapes to heap$" "&s5 escapes to heap$" "tUPiSPPic &U literal does not escape$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPPic &V literal does not escape$" "tUPiSPPic &u3 does not escape$"
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$"
ps2 := &s2 // ERROR "tUPiSPPid &s2 does not escape$"
ps4 := &s4 // ERROR "&s4 escapes to heap$"
ps6 := &s6 // ERROR "&s6 escapes to heap$" "moved to heap: ps6$"
u1 := U{&s1, &ps2} // ERROR "tUPiSPPid &ps2 does not escape$" "tUPiSPPid &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "tUPiSPPid &U literal does not escape$" "tUPiSPPid &ps4 does not escape$" "tUPiSPPid &s3 does not escape$"
u3 := &U{&s5, &ps6} // ERROR "&ps6 escapes to heap$" "&s5 escapes to heap$" "tUPiSPPid &U literal does not escape$"
v := &V{u1, u2, &u3} // ERROR "tUPiSPPid &V literal does not escape$" "tUPiSPPid &u3 does not escape$"
Ssink = v.UPiSPPid() // Ssink = *&ps4 = &s4 (only &s4 really escapes)
}
func (v V) UPPiSPPia() *string { // ERROR "leaking param: v to result ~r0 level=3$"
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() { // This test is sensitive to the level cap in function summary results.
s1 := "ant"
s2 := "bat"
s3 := "cat"
s4 := "dog"
s5 := "emu"
s6 := "fox" // ERROR "moved to heap: s6$"
ps2 := &s2 // ERROR "tUPPiSPPia &s2 does not escape$"
ps4 := &s4 // ERROR "tUPPiSPPia &s4 does not escape$"
ps6 := &s6 // ERROR "&s6 escapes to heap$"
u1 := U{&s1, &ps2} // ERROR "tUPPiSPPia &ps2 does not escape$" "tUPPiSPPia &s1 does not escape$"
u2 := &U{&s3, &ps4} // ERROR "tUPPiSPPia &U literal does not escape$" "tUPPiSPPia &ps4 does not escape$" "tUPPiSPPia &s3 does not escape$"
u3 := &U{&s5, &ps6} // ERROR "tUPPiSPPia &U literal does not escape$" "tUPPiSPPia &ps6 does not escape$" "tUPPiSPPia &s5 does not escape$"
v := &V{u1, u2, &u3} // ERROR "tUPPiSPPia &V literal does not escape$" "tUPPiSPPia &u3 does not escape$"
Ssink = v.UPPiSPPia() // Ssink = *&ps6 = &s6 (only &s6 really escapes)
}